DESCRIPTION
ANTICORROSIVE COATING COMPOSITION, ANTICORROSIVE COATING FILM,
AND METHOD FOR PREVENTING CORROSION OF SUBSTRATE
5
Technical Field
[OOOl] The present invention relates to an anticorrosive
coating composition, an anticorrosive coating film, and a method
for preventing corrosion of a substrate. More particularly, the
10 inventionrelatestoananticorrosive coating compositioncapable
of forming an anticorrosive coating film excellent in adhesion
to metal substrates, anticorrosive properties, and the like, an
anticorrosive coating film formed from the composition, and a
method fox preventing corrosion of metal substrates using the
15 composition.
Background Art
[OOOZ] Usually, for prevention of corrosion, large-sized
steel structures such as ships, land structures, and bridges are
subjectedtoanticorrosive coatingusing ananticorrosivecoating
20 composition. In the anticorrosive coating, an anticorrosive
coating composition is applied on a surface of a steel plate or
the like to form an anticorrosive coating film having a thickness
of several hundredto several thousandmicrometers. As a result,
theanticorrosivecoatingfilmcoatsthesurfaceofthe steelplate
or the like and prevents the steel plate or the like from contacting
with oxygen, salt, vapor, and the like, thereby preventing
corrosion of the steel plate or the like.
[0003] As the anticorrosive coating composition, an
5 epoxy-basedanticorrosive coating composition has been used. In
order to form a thick film having a thickness of from several
hundredto several thousandmicrometers using such an epoxy-based
anticorrosive coating composition, an anticorrosive coating
composition including an amide wax-based thixotropic agent has
10 been used as an anti-sagging and anti-settling agent (a
thixotropic agent). An anticorrosive coating film formed from
the composition has excellent adhesion to substrate surfaces of
steel structures or the like and excellent anticorrosive
properties under usual coating conditions.
16 [0004] As the epoxy-basedanticorrosive coating composition,
specifically, there have been disclosed a coating composition
including a fatty acid amide wax-basedthixotropic agent (Patent
Literature 1) and coating compositions each using a combination
of fatty acid amide wax, oxidized polyethylene wax, and organic
20 bentonite as a thixotropic agent (Patent Literature 2 and 3). In
addition, an epoxy-based anticorrosive coating composition has
been disclosed in which only oxidized polyethylene wax is used
as athixotropicagent, without using fattyacidamidewax (Patent
Literature 4).
Citation List
Patent Literature
[0005] Patent Literature 1: JP-A-2000-129168.
Patent Literature 2: JP-A-S63-275890.
5 Patent Literature 3: JP-A-S63-183966.
Patent Literature 4: JP-A-H4-91175.
SUMMARY OF INVENTION
TECHNICAL PROBLEM
[0006] A structure of a ship, such as a ballast tank, is also
10 required to have anticorrosive properties and thus subjected to
anticorrosive coating. For such a structure, an epoxy-based
anticorrosive coating composition is usually used. In order to
form an anticorrosive coating film having a sufficient film
thickness, the coating composition including an amide wax-based
15 thixotropic agent is applied and dried, and then furthermore, the
coating composition is appliedthereon anddried, thereby forming
an anticorrosive coating film (double coating). In this case,
forobtaininganticorrosiveproperties, it is important to ensure
not only adhesion between a substrate and the coating film (or
20 anticorrosive coating film) formed by the first coating, but also
adhesion between the coating film (or the anticorrosive coating
film) formed by the first coating and the coating film (or
anticorrosive coating film) formed by the second coating.
[0007] Spray coating is oftenusedto apply an anticorrosive
coating composition on such a ship s t r u c t u r e . In t h i s case, f o r
example, during the spray coating of a wall surface or a c e i l i n g
surface, spray dust tends t o a t t a c h onto a surface d i f f e r e n t from
a surface c u r r e n t l y being coated, such as a f l o o r surface.
5 [0008] In addition, p a r t i c u l a r l y when the a n t i c o r r o s i v e
coating composition is coated by the double coating, there a r e
cases i n which a f i r s t coating film is formed on a p a r t ( A ) , and
then, without or while drying the coating f i l m , a f i r s t coating
f i l m is formed on another p a r t (B) . During the formation of the
10 coating filmon the p a r t ( B ) , spray d u s t (or the composition which
gives a spray dust through drying) can attach t o the coating film
formedonthepart ( A ) . In s u c h a c a s e , t h e s p r a y d u s t i s p a r t i a l l y
taken i n t o the coating f i l m i n a process up t o drying the coating
f i l m formed on the p a r t ( A ) . It is thus d i f f i c u l t t o remove the
15 spray d u s t a t t a c h e d t o the coating film surface when performing
a second coating.
[0009] The p r e s e n t inventors performed spray coatings using
conventionally known a n t i c o r r o s i v e coating compositions such as
thecoatingcompositionsdescribedinPatentLiteraturementioned
20 above and found t h a t spray dust as above tends t o occur and reduce
the adhesion of a film formed thereon.
[OOlO] In addition, even i n the spray coating of an inside
o f a ship, suchas a b a l l a s t t a n k , w h e r e v e n t i l a t i o n a f t e r coating
is d i f f i c u l t , a composition which gives a spray dust, can attach,
particularly, onto a floor surface and the like of the ballast
tank. Herein, due tothe structure ofthe ballast tank, thevapor
of a solvent contained in the coating composition tends to stay
near the floor surface. Accordingly, the composition attached
5 onto the floor surfaceandtheliketendstobedriedinthe solvent
atmosphere. Inthis case, theoccurringspraydust has been found
to tend to significantly reduce the adhesion of a film formed
thereon.
[OOll] Furthermore, the composition described in Patent
10 Literature 4 above cannot be applied on a part for which the
formation of a thick film having a dry film thickness of 100 pm
or more is required. In order to coat such a part with the
composition, it has been necessary to change the constituent of
the composition.
15 [0012] The present invention has been accomplished in view
of suchcircumstances, andit is anobject ofthe present invention
to provide an anticorrosive coating composition for use in the
formation of an anticorrosive coating film having a dry film
thickness of 100 pm or more, which is excellent in adhesion to
20 a substrate and anticorrosive properties and whose spray dust
hardly reduces the adhesion of a film formed thereon to an object
to be coated (a target to be coated) even when the spray dust has
attached to the object to be coated.
TECHNICAL SOLUTION
[0013] As aresultofdiligentresearchtosolvetheproblems
described above, the present inventors discovered that the
problems couldbe solvedby an anticorrosive coating composition
comprisinganepoxyresin, acuringagent, asilanecouplingagent,
5 an oxidized polyethylene wax, and an extender pigment, but
substantially comprises no fatty acid amide wax, thereby
completing the present invention. The structure of the present
invention is as follows:
[0014] [I] An anticorrosive coating composition for use in
10 the formation of an anticorrosive coating film having a dry film
thickness of100pmormore,theanticorrosivecoatingcomposition
comprising an epoxy resin (A), a curing agent ( B ) , a silane
coupling agent ( C ) , an oxidized polyethylene wax (D), and an
extender pigment ( E ) , but substantially comprises no fatty acid
15 amide wax.
[0015] [2] The anticorrosive coating composition according
to the [I], which is used under conditions in which spray dust
of the anticorrosive coating composition attaches.
[0016] [3] The anticorrosive coating composition according
20 to the [I] or [2], wherein the composition comprises the oxidized
polyethylene wax (D) in an amount of from 0.01 to 3% by weight
(a nonvolatile content) with respect to 100% by weight of a
nonvolatile content of the anticorrosive coating composition.
[0017] 141 The anticorrosive coating composition according
to any one of the [I] to [3], further comprising bentonite and
fine powdered silica.
[51 The anticorrosive coating composition according to the
[4], wherein the fine powdered silica is a hydrophobic fine
5 powdered silica.
[0018] [6] The anticorrosive coating composition according
to any one of the [I] to [51, wherein the silane coupling agent
(C) is an epoxy group-containing alkoxysilane compound.
[7] The anticorrosive coating composition according to any
10 oneofthe [ l l t o 161, whereinthecompositioncomprisesthesilane
coupling agent (C) in an amount of from 0.01 to 10 parts by weight
with respect to 100 parts by weight (a nonvolatile content) of
the anticorrosive coating composition.
[0019] [8] The anticorrosive coating composition according
15 to any one of the [I] to [7], wherein the extender pigment (E)
comprises at least one pigment selected fromthe group consisting
of silica, barium sulphate, calcium carbonate, talc, barite
powder, dolomite and feldspar, and a flaky pigment (F).
[0020] [9] The anticorrosive coating composition according
20 to any one of the [I] to [8], which is used for spray coating.
[0021] [lo] An anticorrosive coating film formed from the
anticorrosive coating compositionaccording to anyone ofthe [I]
to [9] .
[Ill A method for preventing corrosion of a substrate,
comprising a step of coating the substrate with the anticorrosive
coating composition according to any one of the [I] to [9].
Advantageous Effects of Invention
ADVANTAGEOUS EFFECTS OF INVENTION
5 [0022] The present invention can provide an anticorrosive
coating composition that is excellent adhesion to a substrate and
anticorrosive properties and whose spray dust hardly reduces the
adhesion of a film formed thereon to an object to be coated even
when the spray dust has attached to the object to be coated.
10 In addition, the anticorrosive coating composition of the
present invention also exhibits excellent adhesion to a substrate
when forming a thick film having a dry film thickness of 100 pm
or more. Therefore, sagging and the like of the composition
hardly occur during coating, thus facilitating the formation of
15 the thick film. Particularly, on a part of a ballast tank or the
like requiring the formation of an anticorrosive coating film
having a large film thickness, the composition of the invention
can easily forman anticorrosive coating filmhaving a sufficient
film thickness by an airless spray or the like.
BRIEF DESCRIPTION OF DRAWINGS
(00231 FIG. 1 is a schematic view for explaining an adhesion
test in Examples.
DESCRIPTION OF EMBODIMENTS
[0024] <>
An anticorrosive coating composition of the present
invention (hereinafter also referred to simply as "composition
of the present invention") is an anticorrosive coating
composition for use in the formation of an anticorrosive coating
5 filmhavingadryfilmthickness of100 pmormore, whichcomprises
an epoxy resin (A), a curing agent (B), a silane coupling agent
(C), an oxidized polyethylene wax (D), and an extender pigment
(E), but substantially comprises no fatty acid amide wax.
Thecompositionofthepresentinventionisananticorrosive
10 coating composition that comprises these (A) to (E), but
substantially comprises no fatty acid amide wax. Therefore, the
composition is excellent in adhesion to a substrate and
anticorrosive properties, and spray dust of the composition
hardly reduces the adhesion of a film formed thereon to an object
15 to be coated even when the spray dust has attached to the object
to be coated. In addition, in cases of spray coating on a narrow
portion of a ballast tank or the like, there may occur a region
where spray patterns overlap, which may lead to the formation of
ananticorrosive coating filmhavingathickness about threetimes
20 a desired film thickness. However, even in the formation of such
a thick film (a thick film having a dry film thickness of 300 pm
or more), the composition of the present invention hardly causes
sagging of itself and the like during coating, thus facilitating
the formation of a thick film.
Therefore, the composition of the present invention is
suitably used as an anticorrosive coating composition used for
the formation of a thick film with a thickness of 100 pm or more,
used for ship structures such as a ballast tank, used for spray
5 coating and used under conditions where spray dust of the
composition of the invention attaches.
[0025] The conditionsin which spray dust ofthe composition
of the present invention attaches are not particularly limited
as long as the conditions are those as below in which the spray
10 dust is formed from the composition of the invention.
Specific examples of such conditions include a condition
in which during spray coating with a coating composition, the
coating composition attaches to a part different from a part
currently being coated (a part desired to be coated), and more
15 specifically, conditions in which in the spray coating of a
large-sized steel structure such as a ship, a land structure, or
a bridge, there is a part to be coated on a floor surface or the
like located at a distance of 1 m or more below from a position
of the spray coating, and environmental conditions of coating in
20 which a solvent that may be contained in the composition easily
evaporates such as a temperature ranging from 10 to 40°C and a
humidity of 85% or less.
[00261 The term "spray dust" in the present invention means
a coating composition dried after having attached to a part
different from a part currently being coated (a part desired to
be coated) during spray coating with a coating composition, for
example, onto a floor surface or the like during the coating of
a wall surface and a ceiling surface. Such spray dust usually
6 attaches to a part distant to some extent from a part currently
being coated (a part desired to be coated) in spray coating with
a coating composition.
In addition, spray dust causing reduction in the adhesion
of a film to an object to be coated tends to occur in the use of
10 an anticorrosive coating composition that is required to form a
thick film. This seems to be due to the fact that it is necessary
for an anticorrosive coating composition requiredto formathick
filmnot to sagby itself inthe formationofthe thickfilm, namely,
to have excellent adhesion to a substrate, and in order to meet
15 the need, the composition includes fatty acid amide wax as an
anti-sagging and anti-settling agent (a thixotropic agent).
[0027] In addition, in the present invention, the term
"coating fi1m"means a filmthat is undriedornotcompletelydried
after applying the anticorrosive coating composition; the term
20 "anticorrosive coating film" means a film that has been dried and
cured after applying the anticorrosive coating composition; and
the term "film" means a film (whether dried or undried) formed
from a coating composition (including an anticorrosive coating
composition) .
Additionally, in the present invention, the term "double
c o a t i n g U m e a n s t h a t a f t e r a p p l y i n g t h e composition ofthe present
invention to form a coating film, the film is dried and cured as
needed, and additionally, the same composition is applied
5 thereon; and the term "top coating" means that applying a
composition different from the composition of the formed the
anticorrosive coating film of the invention on the film.
[0028] From viewpoints such as preservation stability, the
composition of the present invention is preferably a
10 two-component type composition prepared by mixing a main agent
component and a curing agent component.
[0029]
The epoxy resin (A) is not particularly limited, and
examples oftheepoxyresin (A) indudenon-tar-basedepoxyresins
15 described in JP-A-Hll-343454 and JP-A-H10-259351.
[00301 Examples of the epoxy resin (A) include polymers or
oligomerscontainingtwoormoreepoxygroupsinmoleculesthereof
and polymers or oligomers produced by ring-opening reactions of
theepoxygroups. Examplesofsuchepoxyresinsincludebisphenol
20 epoxy resins, glycidyl ester epoxy resins, glycidyl amine epoxy
resins, phenol novolac epoxy resins, cresol epoxy resins, dimer
acid-modified epoxy resins, aliphatic epoxy resins, alicyclic
epoxy resins, and epoxidized oil-based epoxy resins.
Among them, from viewpoints such as that there can be
obtained an anticorrosive coating film having excellent adhesion
to a substrate, preferred are bisphenol epoxy resins, more
preferredarebisphenol A-type andbisphenol F-typeepoxy resins,
and particularly preferred are bisphenol A-type epoxy resins.
5 [0031] Examples of such epoxy resins (A) include
epichlorohydrin-bisphenolA epoxy resins (bisphenolAdiglycidy1
ether type); epichlorohydrin-bisphenol AD epoxy resins;
bisphenol F-type epoxy resins obtained from epichlorohydrin and
bisphenol F(4,4'-methylene bisphenol); epoxy novolac resins;
10 alicyclic epoxy resins obtained from
3,4-epoxyphenoxy-3',4'-epoxyphenylcarboxymethaneandthelike;
brominated epoxy resins in which at least one of hydrogen atoms
bondedto a benzene ring in an epichlorohydrin-bisphenolA epoxy
resin is substituted with a bromine atom; aliphatic epoxy resins
15 obtained fromepichlorohydrinandaliphaticdihydricalcohol; and
multifunctional epoxy resins obtained from epichlorohydrin and
tri (hydroxyphenyl)m ethane.
[0032] Examples of bisphenol A-type epoxy resins that are
particularly preferably used include polycondensates of
20 bisphenol A-type diglycidyl ethers, such as bisphenol A
diglycidyl ether, bisphenol A polypropylene oxide diglycidyl
ether, bisphenolA ethylene oxide diglycidylether, hydrogenated
bisphenol A diglycidyl ether, and hydrogenated bisphenol A
propylene oxide diglycidyl ether.
[0033] The epoxy resin (A) may be obtained by synthesizing
using a conventionally known method or may be a commercially
available product.
Examples ofcommerciallyavailableproductsthatareliquid
5 under room temperature include "E028" (a bisphenol A diglycidyl
ether resin manufactured by Ohtake-Meishin Chemical Co., Ltd.,
epoxyequivalent: from180to190, viscosity: from12,000to15,000
mPa's/25OC), "jER-807" (a bisphenol F diglycidyl ether resin
manufactured by Mitsubishi Chemical Corporation, epoxy
10 equivalent: from 160 to 175, viscosity: from 3,000 to 4,500 mPa
s/25OC), "FLEP 60" (manufacturedbyToray Fine Chemicals Co. Ltd.,
epoxy equivalent: about 280, viscosity: about 17,000 mPa.s/25'C),
"E-028-90X" (a xylene solution of a bisphenol A diglycidyl ether
resin (a 828 type epoxy resin solution) manufactured by
15 Ohtake-Meishin Chemical Co., Ltd., epoxy equivalent: about 210).
Examplesthereofthat are semi-solidunderroomtemperature
include "jER-834" (a bisphenol A-type epoxy resin manufactured
by Mitsubishi Chemical Corporation, epoxy equivalent: from 230
to 270), and "E-834-85X" (a xylene solution of a bisphenol A-type
20 epoxy resin (a 834 type epoxy resin solution) manufactured by
Ohtake-Meishin Chemical Co., Ltd., epoxy equivalent: about 300).
Examples thereof that are solid under room temperature
include "jER 1001" (a bisphenol A-type epoxy resin manufactured
by Mitsubishi Chemical Corporation, epoxy equivalent: from 450
t o 500) and "E-001-75" (a xylene solution of a bisphenol A-type
epoxy r e s i n (a 1001 type epoxy r e s i n s o l u t i o n ) manufactured by
Ohtake-MeishinChemical Co., Ltd., epoxy equivalent: about 630).
[0034] The epoxy r e s i n (A) may be used as one kind alone or
5 i n combination of two or more kinds.
[00351 Theepoxy r e s i n (A) ispreferablyliquidorsemi-solid
under room temperature (a temperature of from 15 t o 25OC;
h e r e i n a f t e r t h e same s h a l l apply), from viewpoints such as t h a t
there can be obtained a composition having excellent adhesion t o
10 a s u b s t r a t e .
LO0361 The epoxy r e s i n (A) has an epoxy equivalent o f
preferably from 150 t o 1000, more preferably from 150 t o 600, and
p a r t i c u l a r l y preferably from 180 t o 500, from viewpoints such as
a n t i c o r r o s i v e p r o p e r t i e s .
15 [0037] Aweight-average molecularweight o f t h e epoxy r e s i n
(A) measured by GPC (gel permeation chromatograph) is preferably
from 350 t o 20,000, a l t h o u g h t h e weight-averagemolecular weight
thereof v a r i e s dependingon coating and curing conditions f o r t h e
compositiontobeobtained (examples: ordinary temperature drying
20 c o a t i n g o r b a k e d c o a t i n g ) a n d t h e l i k e a n d t h u s it isnotdetermined
unconditionally.
100381 The c o m p o s i t i o n o f t h e p r e s e n t invention include s t h e
epoxy r e s i n (A) in an amount of preferably from 5 t o 40% by weight,
and more preferably from 10 t o 30% by weight.
In addition, when the composition of the present invention
is a two-component type composition comprising a main agent
component and a curing agent component, the epoxy resin (A) is
included in the main agent component and is desirably included
5 therein in an amount of preferably from 5 to 80% by weight, and
more preferably from 5 to 50% by weight.
[0039]
The curing agent (B) is not particularly limited and
examples ofthecuringagent (B) includeamine-basedcuringagents
10 and acid anhydride-based curing agents. Preferred are amine
curing agents, such as aliphatic, alicyclic, aromatic, and
heterocyclic amine curing agents.
[0040] Examples ofthealiphaticaminecuringagentsinclude
alkylene polyamine and polyalkylene polyamine.
15 [0041] Examples ofthe alkylene polyamine include compounds
represented by a formula: HZN-R'-NHZ (R' represents a divalent
hydrocarbon group of 1 to 12 carbon atoms, and an arbitrary
hydrogen atom of the hydrocarbon group may be substituted with
a hydrocarbon group of 1 to 10 carbon atoms). Specific examples
20 of such compounds include methylene diamine, ethylene diamine,
1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane
1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane,
1,8-diaminooctane, 1,9-diaminononane, 1,lO-diaminodecane, and
trimethyl hexamethylene diamine.
roo421 Examples of the polyalkylene polyamine include
compounds represented by a formula: H2N- (CmH2,NH) ,H (m represents
an integer of from 1 to 10, and n represents an integer of from
2 to 10, and preferably from 2 to 6) . Specific examples of such
5 compounds include diethylene triamine, dipropylene triamine,
triethylene tetramine, tripropylene tetramine, tetraethylene
pentamine, tetrapropylenepentamine, pentaethylenehexamine, and
nonaethylene decamine.
[0043] Examples of aliphatic amine curing agents other than
10 these include tetra(aminomethyl)methane,
tetrakis(2-aminoethylaminomethyl)methane,
1,3-bis (2' -aminoethylamino) propane,
triethylene-bis(trimethylene)hexamine, bis(3-aminoethyl)amine,
bis(hexamethylene)triamine, and bis(cyanoethy1)diethylene
15 triamine.
[00441 Specific examples of the alicyclic amine curing
agents include 1,4-cyclohexanediamine,
4,4' -methylenebiscyclohexylamine,
4,4'-isopropylidenebiscyclohexylamine, norbornanediamine,
20 bis(aminomethyl)cyclohexane, diaminodicyclohexylmethane,
isophoronediamine, and menthenediamine (MDA) .
roo451 Examples ofthe aromatic amine curing agents include
bis (aminoalkyl) benzene, bis (aminoalkyl) naphthalene, and
aromaticpolyamine compounds containingtwo ormoreprimaryamino
groups bound to benzene ring.
100461 More specific examples of the aromatic amine curing
agents include o-xylylenediamine, m-xylylenediamine (MXDA),
p-xylylenediamine, phenylenediamine, napthylenediamine,
5 diaminodiphenylmethane, diaminodiethylphenylmethane,
2,2-bis(4-aminophenyl)propane, 4,4'-diaminodiphenylether,
4,4'-diaminobenzophenone, 4,4'-diaminodiphenylether,
4,4'-diaminodiphenylsulfone,
2,2'-dimethyl-4,4'-diaminodiphenylmethane,
10 2,4'-diaminobiphenyl, 2,3'-dimethyl-4,4'-diaminobiphenyl,
3,3' -dimethoxy-4,4' -diaminobiphenyl,
bis(aminomethyl)naphthalene, and bis(aminoethy1)naphthalene.
100471 Specific examples of the heterocyclic amine curing
agents include N-methylpiperazine, morpholine,
15 1,4-bis- (3-aminopropyl) -piperazine,
piperazine-1,4-diazacycloheptane, 1-(2'-aminoethylpiperazine),
1- [2'- (2" -aminoethylamino) ethyllpiperazine,
1,ll-diazacycloeicosane, and 1,15-diazacyclooctacosane.
[0048] Other examples of the amine curing agents that can
20 be used include amines (amine compounds) mentioned in
JP-B-S49-48480.
100491 Still other examples of the amine curing agents
include diethylaminopropylamine and polyether diamine.
Furthermore, additional examples oftheamine curingagents
include modified products of the above-mentioned amine curing
agents, such as polyamide, polyamideamine (polyamide resin),
amine adducts with epoxy compound, Mannich compounds (example:
Mannich-modified polyamideamine), Michael adducts, ketimine,
6 aldimine, and phenalkamine.
[OOSO] The curing agent (B) may be obtained by synthesizing
using a conventionally known method or may be a commercially
available product.
Examples of the commercially available product include an
10 aliphatic polyamine: "ACI HARDNER K-39" (manufactured by PTI
JAPAN Corporation), polyamideamines: "PA-66", "PA-23", and
"PA-290(A)" (all of which are manufactured by Ohtake-Meishin
Chemical Co., Ltd.),a modified polyamine: "MAD-204(A)"
(manufactured by Ohtake-Meishin Chemical Co., Ltd.), a
15 Mannich-modified polyamideamine: "ADEKA HARDNER EH-342W3"
(manufactured by ADEKA Co., Ltd.), a Mannich-modified aliphatic
polyamine: "SUNMIDE CX-1154" (manufactured by Sanwa Chemical
Industry Co., Ltd.), and a phenalkamine adduct: "CARDOLITE
NC556X8OU (manufactured by Cardolite Corporation).
20 [005l] Examples of the acid anhydride-based curing agents
include phthalic anhydride, tetrahydrophthalic anhydride,
methyltetrahydrophthalic anhydride, 3,6-endomethylene
tetrahydrophthalic anhydride, hexachloroendomethylene
tetrahydrophthalic anhydride, and methyl-3,6-endomethylene
tetrahydrophthalic anhydride.
100521 The curing agent (B) may be used as one kind alone
or in combination of two or more kinds.
[0053] The amine curing agent has an active hydrogen
5 equivalent of preferably from50 to 1000 andmorepreferablyfrom
80 to 400, from viewpoints such as anticorrosive properties.
[0054] In the composition of the present invention, the
curing agent (B) and the epoxy resin (A) are preferably used in
such amounts that an equivalent ratio therebetween (an amount of
10 the curing agent used/an active hydrogen equivalent) / (an amount
ofthe epoxy resin used/epoxy equivalent) is preferably from 0.3
to 1.5 and more preferably from 0.5 to 1.0.
100551 When the composition of the present invention is a
two-component type composition comprising amain agent component
15 and a curing agent component, the curing agent (B) is included
in the curing agent component. The curing agent component is
preferably prepared so as to have a nonvolatile content (a solid
content) of from 50 to 100%. In this case, a viscosity of the
curing agent component measured by an E-type viscometer is
20 preferably 100000 mPa.~/25~oCr less and more preferably from 50
to 10000 rnPa.s/25'C, from viewpoints such as that excellent
handleability and coatability.
100561
Theuse ofthe silane coupling agent (C) can further improve
the adhesion of an anticorrosive coating film to be obtained to
a substrate, as well as can improve anticorrosive properties of
the anticorrosive coating film to be obtained, such as salt water
resistance. Therefore, the composition ofthe present invention
5 preferably comprises the silane coupling agent (C).
The silane coupling agent (C) may be used as one kind alone
or in combination of two or more kinds.
[0057] The silane coupling agent (C) is not particularly
limited and can be a conventionally known one. The silane
10 coupling agent (C) is preferably a compound that has at least two
functional groups in one molecule and can contribute to
improvementinadhesiontoa substrate, reduction in theviscosity
of the composition, and the like, and more preferably a compound
represented by a formula: X-Si (OR)3 [X represents a functional
15 group capable of reacting with an organic substance (such as an
amino group, a vinyl group, an epoxy group, a mercapto group, a
halo group, orahydrocarbongroupcontaininganyofthesegroups,
in which the hydrocarbon group may include an ether bond and/or
the like) or represents an alkyl group; and OR represents a
20 hydrolyzable group (such as a methoxy group or an ethoxy group) ] .
100581 Among them, preferred are epoxy group-containing
alkoxysilane compounds in which the X is an epoxy group. Such
epoxy group-containing alkoxysilane compounds can further
improve the adhesion of an anticorrosive coating film to be
obtained to a substrate, as well as can improve the anticorrosive
properties ofthe anticorrosive coating filmto beobtained, such
as salt water resistance, and also can reduce the viscosity of
the composition of the present invention, thus improving coating
5 workability.
[0059] Specific examples of the preferable silane coupling
agents include "KBM 403" (y-glycidoxypropyltrimethoxysilane
manufactured by Shin-Etsu Chemical Co., Ltd.) and "SILA-ACE
S-510" (manufactured by JNC Corporation) .
10 [00601 Inthecompositionofthepresent invention, anamount
of the silane coupling agent (C) to be mixed is preferably from
0.01 to 10 parts by weight, more preferably from 0.05 to 10 parts
by weight, and stillmore preferably from 0.3to 5 parts by weight
with respect to 100 parts by weight (a nonvolatile content) of
16 the anticorrosive coating composition. The use of the
composition including the silane coupling agent (C) in such an
amount can improve the performances of an anticorrosive coating
film, suchas adhesiontoa substrateandanticorrosive properties
and can reduce the viscosity ofthe composition ofthe invention,
20 thus improving coating workability.
[00611
Since the composition of the present invention comprises
the oxidized polyethylene wax (D), the composition exhibits
excellent adhesion to a substrate even in the formation of athick
film having a dry film thickness of 100 pm or more and sagging
ofthe composition and the like hardly occur during coating, thus
facilitating the formation of a thick film. Particularly, due
to comprise the oxidized polyethylene wax (D), the (A) to (C) and
5 the (E), the composition of the invention can remarkably exhibit
such effects as above.
[00621 Examples ofthe oxidizedpolyethylenewax (D) include
resins preparedby oxidation of polyethylene and introduction of
a polar group.
10 Such an oxidized polyethylene wax (D) may be obtained by
synthesizing using a conventionally known method or may be a
commercially available product.
Examples of the commercially available product include
"DISPARLON 4200-20" (manufactured by Kusumoto Chemicals, Ltd.)
15 and "ASA D-120" (manufactured by Itoh Oil Chemicals Co., Ltd) .
[DO631 The oxidized polyethylene wax (D) may be used as one
kind alone or in combination of two or more kinds.
[00641 An average molecular weight of the oxidized
polyethylene wax (D) measured by a methods for viscosity
20 measurement of solution is preferably from 1000 to 5000 and more
preferably from2000 to 3500. When the average molecular weight
is within the above range, there can be obtained a composition
excellent in anti-sagging properties and coating workability.
[00651 The oxidized polyethylene wax (D) preferably has an
acid value ranging from 10 to 40 KOHmg/g. When the acid value
is within the range, an obtainedanticorrosive coating filmtends
to have excellent coating film physical properties.
[0066] Inthecompositionofthepresent invention, acontent
5 (a nonvolatile content) of the oxidized polyethylene wax (D) is
preferably from 0.01 to 3 parts by weight, more preferably from
0.2 to 2.0 parts by weight, and still more preferably from 0.5
to 1.8 parts by weight with respect to 100 parts by weight of the
nonvolatile content in the composition of the invention.
10 The composition of the present invention includes the (A)
to (C) and the (E) , and further includes the oxidized polyethylene
wax (D) in the amount mentioned above, as a result of which even
without substantially including fatty acid amide wax, the
composition has excellent adhesion to a substrate when forming
15 a thick film having a dry film thickness of 100 pm or more and
saggingofthecompositionandthelikehardlyoccurduringcoating,
thus facilitating the formation of a thick film.
100671
The composition of the present invention comprises the
20 extender pigment ( E ) , whereby there is an advantage in that the
composition can be obtained cost-effectively, as well as there
can be formed an anticorrosive coating film excellent in
anticorrosive properties, salt water resistance, high
temperature and high humidity resistance, and the like.
The extender pigment (E) may be used as one kind alone or
in combination of two or more kinds.
[0068] Specific examples ofthe extenderpigment (E) include
silica, barium sulphate, calcium carbonate, dolomite, feldspar,
5 barite powder, talc, and a flaky pigment (F).
Among them, the composition of the present invention
preferably includes at least one pigment selected fromthe group
consisting of silica, barium sulphate, calcium carbonate, talc,
dolomite and feldspar, and the flakypigment (F), fromviewpoints
10 such as that there can be formed an anticorrosive coating film
moreexcellentinanticorrosiveproperties, saltwaterresistance,
high temperature and high humidity resistance, and the like.
The flaky pigment (F) may be used as one kind alone or in
combination of two or more kinds.
15 [0069] The flaky pigment (F) is preferably a pigment whose
average flake diameter measured by a particle size distribution
analyzer is from 30 to 200 pm and whose average aspect ratio is
from 30 to 100, from viewpoints such as improvement in blistering
resistance, reduction in creeping properties, and relaxation of
20 internal stress in an anticorrosive coating film to be obtained.
Examples of the flaky pigment (F) include mica and glass
flake. Preferred is mica, from viewpoints such as that it is
easily available at low cost and there can be formed an
anticorrosive coating film more excellent in the above effects.
[0070] Themicaispreferablymicahavingahighaspectratio
o f f r o m 3 0 t o 90, fromviewpoints suchas improvement i n b l i s t e r i n g
r e s i s t a n c e , reduction i n creeping properties, and r e l a x a t i o n of
i n t e r n a l s t r e s s i n an a n t i c o r r o s i v e coating film t o be obtained.
5 Examples ofsuchmicahavingahighaspectratioinclude "SUZORITE
MICA 200HK" (manufactured by Kuraray Trading Co., Ltd., aspect
r a t i o : from 40 t o 60) .
[0071] I n t h e compositionofthepresent invention, a content
of the extender pigment (E) is preferably from 5 t o 80 p a r t s by
10 weight and more preferably from 10 t o 70 p a r t s by weight with
respect t o a t o t a l 100 p a r t s by weight (a nonvolatile content)
of the epoxy resin ( A ) , the curing agent ( B ) , the s i l a n e coupling
agent ( C ) , the oxidized polyethylene wax ( D l , and the extender
pigment (E) , from viewpoints such as t h a t there can be obtained
15 an a n t i c o r r o s i v e coating film excellent i n a n t i c o r r o s i v e
p r o p e r t i e s and coating film physical properties.
In addition, when mixing the flaky pigment (F) i n the
composition of the present invention, an amount of the flaky
pigment (F) t o be mixed is preferably from 1 t o 40 p a r t s by weight
20 and more preferably from 3 t o 20 p a r t s by weight with respect t o
100 p a r t s by weight o f t h e nonvolatile content o f t h e composition
of the invention, from viewpoints such as improvement i n the
performances of an a n t i c o r r o s i v e coating f i l m , such as water
resistance/anticorrosive p r o p e r t i e s and bending r e s i s t a n c e .
100721
The composition of the present invention substantially
includes no fatty acid amide wax.
Examples of the fatty acid amide wax include amide waxes
5 synthesized from vegetable oil fatty acids and amines.
[0073] Whenananticorrosivecoating compositionisused for
purposes requiring anticorrosive properties, particularly for a
steel structure forming a ship, an anticorrosive coating film to
be formed is required to have a film thickness of 100 pn or more.
10 Considering theoccurrence ofa spray patternoverlapping region,
the composition is required to have sufficient anti-sagging
properties capable of forming an anticorrosive coating film
having a film thickness of 300 pm or more. In cases of forming
ananticorrosivecoating filmhaving suchathickness, for example,
15 on a substrate of a wall surface, a ceiling surface, or the like,
the thickness tends to cause sagging of the composition during
coating. Thus, it has been difficult to obtain an anticorrosive
coating film having excellent anticorrosive properties and
uniform film thickness.
20 Particularly, in a case of a ballast tank, it is necessary
to form an anticorrosive coating film having a film thickness of
160 p or more by single coating. In addition, the ballast tank
is a structure including reinforcingmembers suchas longitudinal
and transverse members. Accordingly, when considering the
occurrence ofa spray patternoverlapping region, it is sometimes
necessary to have anti-sagging properties capable of forming an
anticorrosive coating film having a film thickness of 480 pm or
more, which is three times the desired film thickness.
5 [0074] Thus, in anticorrosive coating compositions forming
an anticorrosive coating film having such a thickness, an
anti-sagging and anti-settling agent (a thixotropic agent) have
beenincludedinordertopreventsaggingofthecompositionduring
coating, in other words, in order to obtain a composition having
10 excellent adhesion to a substrate.
Various compounds are known as the anti-sagging and
anti-settling agent (the thixotropic agent). From viewpoints
such as its excellent anti-sagging effect, fatty acid amide wax
has been conventionally used. Particularly, the formation of an
15 anticorrosive coating film having a large thickness has required
the use of fatty acid amide wax.
LO0751 However, as the results of diligent research, the
present inventors found that spray dust formed from the
conventional anticorrosive coating compositions including fatty
20 acid amide wax causes reduction in the adhesion of a film formed
thereon to an object to be coated.
Accordingly, although fatty acid amide wax is preferably
used for forming a thick anticorrosive coating film, the
composition ofthe presentinventionpreferablyincludes no fatty
acid amide wax, due to the consideration that spray dust formed
from an anticorrosive coating composition including fatty acid
amidewaxreducestheadhesionofa filmformedthereontoanobject
to be coated.
5 The composition of the present invention comprises the (A)
to (E) and therefore can form a thick anticorrosive coating film
even without substantially including fatty acid amide wax.
100761 Considering the description hereinabove, it is
preferable for the composition of the present invention to
10 substantially include no fatty acid amide wax.
100771
The composition of the present invention may comprise,
besides the (A) to (E) , another anti-sagging and anti-settling
agent, a solvent, a plasticizer, a curing accelerator, a coloring
15 pigment, an inorganic dehydration agent (a stabilizer), a
defoamingagent, anantifoulingagent, and/orthelike, asneeded,
as long as the object of the invention is not impaired.
Theseothercomponentsmaybeconventionallyknownonesthat
are used in anticorrosive coating compositions.
20 [0078] (Another Anti-Sagging and Anti-Settling Agent)
The other anti-sagging and anti-settling agent (a compound
other than the oxidized polyethylene wax (D) and fatty acid amide
wax) can provide thixotropy to the composition of the present
inventiontoimprovetheadhesionofthecompositiontoasubstrate.
Althoughtheoxidizedpolyethylenewax (D) is alsoananti-sagging
andanti-settling agent, the composition ofthe present invention
mayfurtherincludeanotheranti-saggingandanti-settlingagent,
as needed.
5 The other anti-sagging and anti-settling agent is not
particularly limited and examples thereof include organic
thixotropic agents and inorganic thixotropic agents.
The other anti-sagging and anti-settling agent may be used
as one kind alone or in combination of two or more kinds.
10 [0079] Examples of the organic thixotropic agents include
hydrogenated castor oil-based, vegetable oil polymerized
oil-based, and surfactant-based thixotropic agents and
thixotropic agents as combinations of two or more kinds thereof.
[0080] In addition, examples of the inorganic thixotropic
15 agents include fine powdered silica (usually, silica whose
primary particles having an average particle diameter of 40 nm
or less whenmeasuredby scanning electronmicrographobservation,
and having a specific surface area of from 50 to 410 m2/g when
measured by BET method), bentonite, silica surface-treated with
20 a silane compound or the like, bentonite surface-treated with
quaternary ammonium salt or the like (organic bentonite),
ultrafine surface-treated calcium carbonate, and mixtures
thereof. Specific examples of the inorganic thixotropic agents
include silica fine powder obtained bymicronization by a drying
method [for example, product name: AEROSIL 300 manufactured by
Nippon Aerosil Co., Ltd.], fine powered silica not
surface-treated [for example, product name: AEROSIL 200
manufactured by Nippon Aerosil Co., Ltd.], fine powder obtained
5 by modifying silica fine powder with hexamethyldisilazane [for
example, product name: AEROSIL RX300 manufactured by Nippon
Aerosil Co., Ltd.], finepowderobtainedbymodifying silica fine
powder with polydimethylsiloxane [for example, product name:
AEROSIL RY300 manufactured by Nippon Aerosil Co., Ltd.],
10 hydrophobic fine powdered silica obtained by modifying silica
fine powder with dimethyldichlorosilane [for example, product
name: AEROSIL R972 manufacturedby Nippon Aerosil Co., Ltd.], and
organic bentonite (product name: BENTONE SD-2 manufactured by
Elementis Specialties, Inc).
16 [0081] Among them, preferred as the other anti-sagging and
anti-settling agent is a combination of fine powdered silica
(including silica surface-treated with a silane compound or the
like) and bentonite (including bentonite surface-treated with
quaternary ammonium salt or the like), from viewpoints such as
20 t h a t t h e r e c a n b e o b t a i n e d a c o m p o s i t i o n h a v i n g e x c e l l e n t a d h e s i o n
to a substrate.
Particularly, more preferred is a combination of a
hydrophobic fine powdered silica prepared by treating a fine
powdered silica with dimethyldichlorosilane and an organic
bentonite. Specifically, when a content of the oxidized
polyethylene wax (D) in the coating composition is 1.2 parts by
weight or less (a nonvolatile content), it is more preferable to
use a combination of a hydrophobic fine powdered silica and an
6 organic bentonite, as an inorganic thixotropic agent.
[00821 Inmixingofthe other anti-saggingandanti-settling
agent in the composition of the present invention, an amount of
the other anti-sagging and anti-settling agent to be mixed (a
nonvolatile content) is preferably from 0.1 to 4 parts by weight
10 and more preferably from 0.1 to 2 parts by weight with respect
to 100 parts by weight of the nonvolatile content of the
composition of the invention, from viewpoints such as coating
workability.
LOO831 In addition, a total content (nonvolatile content)
15 of the oxidized polyethylene wax (D) and the other anti-sagging
and anti-settling agent in the composition of the present
invention is preferably from 0.5 to 5 parts by weight and more
preferably from 0.7 to 3 parts by weight with respect to 100 parts
by weight of the nonvolatile content of the composition of the
20 invention, from viewpoints such as that there can be obtained a
composition having well-balanced excellence in anti-sagging
properties, coating workability, and the like.
I00841 Additionally, in this case, the above mixing is
preferablyperformedsuchthataweightratiobetweenthecontents
(nonvolatile contents) of the oxidized polyethylene wax (D) and
the other anti-sagging and anti-settling agent (the content
(nonvolatile content) of the oxidized polyethylene wax (D):the
content (nonvolatile content) of the other anti-sagging and
5 anti-settling agent) is preferably from 15: 85 to 85: 15 and more
preferably from25:75 to 75:25 (providedthat atotal nonvolatile
content of the oxidized polyethylene wax (D) and the other
anti-sagging and anti-settling agent is 100).
[0085]
10 The solvent is not particularly limited and can be used a
conventionally known one. Examples of known solvents that can
be used include xylene, toluene, methyl isobutyl ketone,
methoxypropanol, methyl ethyl ketone, butyl acetate, butanol,
isopropyl alcohol, and propylene glycol monomethylether (PGM).
15 These solvents may be used as one kind alone or in
combination of two or more kinds thereof.
[0086] In the mixing of the solvent in the composition of
the present invention, an amount of the solvent to be mixed is
not particularly limited and can be adjusted as needed depending
20 on a coating method used when coating the composition of the
invention. However, when.considering the coatability and the
like of the composition of the present invention, the solvent is
preferablyincludedin suchanamountthatthenonvolatilecontent
of the composition of the invention has a concentration of
preferably from 55 to 98% by weight and more preferably from 65
to 95% by weight.
In addition, in cases of spray coating the composition of
the present invention, the solvent is preferablyincluded in such
5 an amount that the nonvolatile content of the composition of the
invention has a concentration of preferably from 55 to 95% by
weight and more preferably from 65 to 90% by weight, from
viewpoints such as coatability.
[0087]
10 The composition of the present invention preferably
comprises a plasticizer, from viewpoints such as improvement in
flexibility and weather resistance of an anticorrosive coating
film to be obtained.
The plasticizer may be used as one kind alone or in
15 combination of two or more kinds.
100881 The plasticizer can be selected from a wide range of
conventionally known ones, and examples thereof include liquid
hydrocarbon resins of low boiling point fractions or the like
obtained by thermal decomposition of naphtha, petroleum resins
20 that are solid under room temperature, xylene resins, and
coumarone-indene resins. Specific examples thereof include a
liquid hydrocarbon resin and a flexibility-imparting resin
described in JP-A-2006-342360.
[00891 Among them, preferred are liquidhydrocarbon resins,
and hydroxyl group-containing petroleum resins that are solid
under room temperature, xylene resins and coumarone-indene
resins.
[0090] Examples of commercially available products of the
5 liquid hydrocarbon resins include "NECIRES EPX-L" and "NECIRES
EPX-L2" (both of which are phenol-modified hydrocarbon resins
manufactured by NEVCIN Polymers Co.), "HILENOL PL-1000S" (a
liquid hydrocarbon resin manufactured by Kolon Chemical Co).
Examples of commercially available products of the
10 petroleum-based resins that are solid under room temperature
include "NEOPOLYMER E-loo", "NEOPOLYMER K-2", and "NEOPOLYMER
K-3" (all of which are C9-based hydrocarbon resins manufactured
by Nippon Petrochemicals Co. Ltd.); examples of commercially
available products of the coumarone-indene resins include
15 "NOVARES CA 100" (manufactured by Rutgers Chemicals AG); and
examples of commercially available products ofthe xylene resins
include "NIKANOL Y-51" (manufactured by Mitsubishi Gas Chemical
Company, Inc) .
[0091] In the mixing of the plasticizer in the composition
20 ofthe present invention, anamount ofthe plasticizer tobemixed
is preferably from 1 to 50 parts by weight and more preferably
from 3 to 30 parts by weight with respect to 100 parts by weight
ofthe composition ofthe invention, fromviewpoints suchas that
there can be obtained an anticorrosive coating film excellent in
weather resistance, anti-cracking properties, and the like.
[00921
The composition of the present invention preferably
comprises a curing accelerator that can contribute to the
5 adjustment of curing rate, particularly acceleration thereof.
Examples ofthecuringacceleratorincludetertiaryamines.
The curing accelerator may be used as one kind alone or in
combination of two or more kinds.
[0093] Specific examples of the curing accelerator include
10 triethanol amine, dialkylaminoethanol, triethylenediamine
[I, 4-diazacyclo (2,2,2) octane],
2,4,6-tri(dimethylaminomethyl)phenol (examples: product name
"VERSAMINEEH30f' (manufacturedbyHenke1 Hakusuicorporation) and
product name: "ANCAMINE K-54" (manufacturedby Air Products Japan,
15 Inc.) ) .
[0094] These curing accelerators are preferablyincludedin
amounts of from 0.05 to 2.0% by weight in the composition of the
present invention.
[00951
20 Examples of the coloring pigment include titanium white,
red iron oxide, yellow iron oxide, and carbon black.
The coloring pigment may be used as one kind alone or in
combination of two or more kinds.
[0096] In the mixing of the coloring pigment in the
composition of the present invention, an amount of the coloring
pigment to be mixed is preferably from 0.01 to 20 parts by weight
and more preferably from 0.03 to 10 parts by weight with respect
to 100 parts by weight of the nonvolatile content of the
5 composition of the invention.
roo971 In addition, the extender pigment (E) and the coloring
pigment are preferably included in such amounts that a pigment
volume concentration in an anticorrosive coating film formed from
the composition of the present invention (PVC: a volume
10 concentrationoftheextenderpigment (E) andthecoloringpigment
in the anticorrosive coating film) is preferably from 10 to 75%
byweightandpreferablyfrom20 to 45% by weight, fromviewpoints
such as anticorrosive properties.
to0981 <>
15 The anticorrosive coating film ofthe present invention is
not particularly limited as long as it is a film formed from the
composition ofthe invention. The anticorrosive coating film of
the present invention is preferably a film obtained by forming
a coating film from the composition of the invention applied on
20 a substrate and then drying and curing the coating film.
Thus anticorrosive coating film has excellent
anticorrosive properties, such as saltwater resistance andhigh
temperature and high humidity resistance, excellent adhesion to
a substrate, and excellent properties in which spray dust of the
composition hardly reduces the adhesion of a film formedthereon
to an object to be coated even when the spray dust has attached
to the object to be coated.
[0099] The substrate is not particularly limited but
5 preferably a substrate for which anticorrosive properties are
required, fromviewpoints such as that the effects ofthe present
invention can be further exhibited.
[OlOO] As such a substrate, preferred are substrates
comprising steel, non-ferrous metals (such as zinc, aluminium,
10 and stainless steel), or the like. Among structures such as ships,
land structures, and bridges comprising these materials, more
preferred ones are ship structures, among which a ballast tank
is more preferred. The ballast tank may be one subjected to
electric anticorrosion treatment by installationof ananodemade
15 of zinc, zinc-aluminium, orthe like. Theelectricanticorrosion
treatment is performed at a current density of preferably from
1 to 10 mP./m2.
[OlOll The substrate may be one whose surface has been
treated (for example, blast treatment (IS0 8501-1 Sa2 1/2), power
20 tool treatment, a friction method, an oil and dust removal
treatment by degreasing, and/or the like) as needed in order to
remove rust, oil and fat, water, dust, slime, salt, and the like
and in order to improve the adhesion of an anticorrosive coating
film to be obtained. In addition, from viewpoints such as
anticorrosive properties, weldability, and shearability of the
substrate, the substratemaybe one whose surface when needed has
beencoatedwith a coatingmaterial forthin-film formation, such
as a conventionally known primary anti-rust coating material (a
5 shop primer), another primer, or the like and then dried.
[01021 A method for applying the composition of the present
invention on the substrate is not particularly limited, and a
conventionally known method can be unlimitedly used. Preferred
is spray coating, from viewpoints such as that it is excellent
10 inworkability, productivity, andthe like; coating can be easily
performed even on a substrate with a large area; and the effects
of the present invention can be further exhibited.
When the composition of the present invention is a
two-component type composition, a main agent component and a
16 curing agent component may be mixed together immediately before
coating and then spray coating or the like may be performed.
[0103] Conditions for the spray coating can be adjusted as
needed, in accordance with the thickness of an anticorrosive
coating filmdesiredtobe formed. For airless spraying, coating
20 conditions may be set to, for example, a primary (air) pressure
ranging from 0.4 to 0.8 Mpa, a secondary (coating material)
pressure ranging from 10 to 26 MPa, and a gun moving speed ranging
from 50 to 120 cm/second.
[OlO4] A method for drying and curing the coating film is
not p a r t i c u l a r l y limited. In order t o shorten a time f o r drying
and curing, the coating film may be dried and cured by heating
a t a temperature ranging from 5 t o 60°C. However, usually, the
coating film i s d r i e d and cured by allowing t h e f i l m t o stand a t
5 room temperature i n the a i r for from 1 t o 1 4 days.
[OlOS] The film thickness o f t h e a n t i c o r r o s i v e coating film
is not p a r t i c u l a r l y limited as long as it is 100 pm or more. The
f i l m t h i c k n e s s of the a n t i c o r r o s i v e coating film can be selected
as neededdepending on the desired purpose and is preferably from
10 100 t o 450 pm and more preferably from 250 t o 400 pm.
In the formation o f an anticorrosive coating film having
such a film thickness, s i n g l e coating may be performed t o form
an anticorrosive coating film having a desired thickness, or
depending on the a n t i c o r r o s i v e properties, double coating (or
15 more than t h a t , i f needed) may be performed t o form an
a n t i c o r r o s i v e coating- f i l m having a desired thickness.
Preferably, double coating is performedto forman a n t i c o r r o s i v e
coatingfilmhavingathicknessintheaboverange, fromviewpoints
such as t h a t there can be formed an a n t i c o r r o s i v e coating film
20 having excellent a n t i c o r r o s i v e properties.
[0106] In the case of formingthe a n t i c o r r o s i v e coating film
on a ship s t r u c t u r e such as a b a l l a s t tank as the s u b s t r a t e , the
film is required t o have a thickness of 300 pm or so. The
composition of the present invention has excellent adhesion t o
a substrate, specifically, has excellent anti-saggingproperties,
thereby facilitating the formation of an anticorrosive coating
film having such a thickness.
[0107] <>
5 Amethod for preventing corrosion of a substrate according
to the present invention is not particularly limited as long as
the method includes a step of applying the composition of the
invention on a substrate. Preferred is a method for preventing
corrosionofa substrate inwhichthe compositionofthe invention
10 is applied on a substrate to form a coating film and then the
coating film is dried and cured.
In this method, the substrate, the coating method, and the
like may be the same as those described in the section of the
anticorrosive coating film.
15 [01081 In addition, in the method for preventing corrosion
of a substrate, a conventionally known top coating material such
as an antifouling paint may be applied, dried, and cured on an
obtained coating film or anticorrosive coating filmdepending on
the desired purpose.
20 [0109] For example, a method for preventing corrosion of a
ballast tank will be performed as follows:
First, the composition of the present invention is spray
coated on a floor surface of the ballast tank (a first coating,
a dry film thickness of about 160 pm) . Without or while drying
the obtained coating film, the composition of the invention is
spray coated on a wall surface and a ceiling surface. In this
case, the composition which gives a spray dust through drying,
attaches onto the floor surface, and then drying proceeds in a
5 solvent atmosphere. After the coating film on the floor surface
has been dried, the composition previously used is spray coated
again on the floor surface (a second coating, adry filmthickness
of about 160 pm) . In addition, the previously used composition
is also similarly spray coated on the wall surface and the ceiling
10 surface, resulting in the formation of an anticorrosive coating
film having a thickness of 320 pm or so on the floor surface, the
wall surface, and the ceiling surface.
The abovemethod for preventing corrosion of a ballast tank
is the condition under which spray dust tends to reduce the
15 adhesion of a film (which is a coating film and a dried coating
film obtained by the second coating) formed thereon to an object
to be coated (which is a spray dust-attached dried coating film
obtained by the first coating), as described above. However, the
use ofthe composition ofthe presentinventionhardlycauses such
20 adhesion reduction.
On the other hand, the uses of the conventional
anticorrosive coating compositions result in significant
adhesion reduction.
Examples
[OllO] Hereinafter, the present invention w i l l be f u r t h e r
describedwith reference t o Examples. However, the invention is
not limited t h e r e t o .
[0111] Regarding a n t i c o r r o s i v e coating films formed from
5 compositions obtainedinExamples andComparativeExamplesbelow,
the following t e s t s (1) t o ( 7 ) were conducted. Table 2 shows t h e
r e s u l t s .
In the following t e s t s (1) t o ( 5 ) , p a r t i c u l a r l y when the
obtained compositions are used for ships, and more p a r t i c u l a r l y ,
10 for b a l l a s t tanks, they are required t o have a r e s u l t of 'A".
[0112] (1) S a l t Water Resistance Test
S a l t water r e s i s t a n c e s of a n t i c o r r o s i v e coating films were
measuredbasedon JISK-5600 6-1. S p e c i f i c a l l y , themeasurements
were conducted as follows.
15 Each of the compositions obtained i n the Examples and
Comparative Examples below was spray coated t o give a dry film
thickness of about 250 pm on a s t e e l p l a t e having a s i z e of 150
mm x 70 mm x 1 . 6 mm ( t h i c k n e s s ) subjected t o b l a s t i n g treatment
( h e r e i n a f t e r r e f e r r e d t o a l s o a s " t e s t p l a t e " ) . Theobtainedtest
20 p l a t e s with the coating film were dried i n an atmosphere of 23OC
and 50% RH f o r 7 days t o produce t e s t p l a t e s with an a n t i c o r r o s i v e
c o a t i n g f i l m . Using the t e s t p l a t e s with the a n t i c o r r o s i v e
coating film, the appearances o f t h e anticorrosive coating films
a f t e r having been immersed i n 3% s a l t water a t 40°C f o r 90 days
were v i s u a l l y evaluated according t o the following c r i t e r i a :
(Evaluation C r i t e r i a )
A: There are no changes on b l i s t e r i n g , cracking, r u s t ,
peeling, and hue.
5 B: There a r e s l i g h t defects (changes) on any of b l i s t e r i n g ,
cracking, r u s t , peeling, and hue.
C: T h e r e a r e o b v i o u s c h a n g e s o n a n y o f b l i s t e r i n g , cracking,
r u s t , peeling, and hue.
[0113] (2) E l e c t r i c Anticorrosion Test
10 A zinc anode was connected t o each of test p l a t e s with an
anticorrosive coating film produced i n the same manner as i n the
s a l t water r e s i s t a n c e t e s t t o give an e l e c t r i c current d e n s i t y
of 5 mPi/rn2 or l e s s , and then the t e s t p l a t e s were immersed i n 3%
s a l t water a t 40°C for 90 days. After t h a t , t h e appearances of
15 t h e a n t i c o r r o s i v e coatingfilmswerevisuallyevaluatedaccording
t o the following c r i t e r i a :
(Evaluation C r i t e r i a )
A: There are no changes on b l i s t e r i n g , cracking, r u s t ,
peeling, and hue.
20 B: There are s l i g h t defects (changes) on any of b l i s t e r i n g ,
cracking, r u s t , peeling, and hue.
C: T h e r e a r e o b v i o u s c h a n g e s o n a n y o f b l i s t e r i n g , cracking,
r u s t , peeling, and hue.
[0114] (3) S a l t water Spray Test
Based on JIS K-5600 7-1, a solution with a salt water
concentration of 5% was sprayed onto each of test plates with an
anticorrosive coating film produced in the same manner as in the
salt water resistance test, continuously for 90 days under a
5 condition of 35OC. Then, the appearances of the anticorrosive
coating films were visually evaluated according tothe following
criteria:
(Evaluation Criteria)
A: There are no changes on blistering, cracking, rust,
10 peeling, and hue.
B: There are slight defects (changes) on any of blistering,
cracking, rust, peeling, and hue.
C: Thereareobvious changesonanyofblistering, cracking,
rust, peeling, and hue.
15 101151 (4) High Temperature and High Humidity Resistance
Test
High temperature and high humidity resistances of
anticorrosivecoatingfilmsweremeasuredbasedonJISK-5600 7-2.
Specifically, the measurement was conducted as follows.
20 Using test plates with an anticorrosive coating film
produced in the same manner as in the salt water resistance test,
each of the test plates was kept in a tester with a temperature
of 50°C and a humidity of 95% for 90 days. Then, the appearances
of the anticorrosive coating films were evaluated according to
the following criteria:
(Evaluation Criteria)
A: There are no changes on blistering, cracking, rust,
peeling, and hue.
5 B: There are slight defects (changes) on any of blistering,
cracking, rust, peeling, and hue.
C: Thereareobvious changesonany ofblistering, cracking,
rust, peeling, and hue.
[0116] (5) Second coating Adhesion
10 Second coating adhesions of anticorrosive coating films
were measured based on JIS K-5400 8.5.3. Specifically, the
evaluation was conducted as follows:
Each of the compositions obtained in the Examples and
Comparative Examples below was spray coated on each test plate
15 to give a dry film thickness of about 160 pm, whereby test plates
with a coating film were obtained. The obtained test plates with
the coating film were dried in an atmosphere of 23OC and 50% RH
for 1 day. Then, the same composition as that used to form the
coating film was spray coated on each of the obtained test plates
20 with the dried coating film to give a dry film thickness of about
160 pm. The resulting test plates were dried in an atmosphere
of 23°C and 50% RH for 7 days to obtain test plates with an
anticorrosive coating film having a film thickness of 320 pm.
[0117] Usingthe obtainedtestplates withthe anticorrosive
coating film, a peeling state between the anticorrosive coating
films (a peeling rate) was evaluated according to the following
criteria. Theevaluationwillbedescribedwithreferenceto FIG.
1.
5 An X-shaped incision 2 was formed on a surface of the
anticorrosive coating film 1 of each of the obtained test plates
withthe anticorrosive coating film. In this case, anarea within
a quadrangle formed by connecting four end portions of the two
cuts of the incision 2 was designated as an incision-formed area
10 3.
After that, an adhesive cellophane tape was stuck onto the
X-shaped incision and one end of the tape was peeled off at an
angle close to 90 degrees with respect to the surface of the
anticorrosive coating film to evaluate the peeling state between
15 the anticorrosive coating films (a peeling rate). Visual
estimation was made on a rate of the anticorrosive coating film
peeledoff fromthetestplatewith respect totheincision-formed
area 3 after peeling off the tape.
(Evaluation Criteria)
20 A: No peeling is observed.
B: Peeling rate is from 1 to 15% of the entire film.
C: Peeling rate is more than 15% of the entire film.
[01181 (6) Adhesion to Spray Dust-Attached Surface
Adhesionsto spraydust dust spray)-attachedsurfaceswere
measuredbasedonJIS K-5400 8.5.3. S p e c i f i c a l l y , the evaluation
was conducted as i n the following (6-1) t o (6-3).
[0119] (6-1)
Test p l a t e s having a s i z e of 150 x 70 x 1.6 (thickness) mm
5 were placed in such a manner t h a t surfaces thereof were
s u b s t a n t i a l l y v e r t i c a l with respect t o gravity, and then coated
with each of t h e a n t i c o r r o s i v e coating compositions obtained in
the Examples andComparativeExamples below such t h a t an obtained
a n t i c o r r o s i v e c o a t i n g f i l m h a d a f i l m t h i c k n e s s o f 1 6 0 pm, thereby
10 obtaining t e s t p l a t e s with the coating film.
A coating film surface of each of the obtained t e s t p l a t e s
with the coating filmwas c o a t e d w i t h t h e same composition as t h a t
used t o form the coating film, by spray coating from a height of
about 3 m above the t e s t p l a t e . In t h i s way, the composition t h a t
15 gives a spray d u s t through drying was attached t o about 95% or
more o f a s u r f a c e a r e a of the c o a t i n g f i l m . The t e s t p l a t e s with
the compositionthat gives a spraydustweredriedinanatmosphere
of 23OC and 50% RH for 1 day. Then, the same composition as t h a t
u s e d t o formthe a n t i c o r r o s i v e coating filmwas again spray coated
20 on the obtained t e s t p l a t e s with the dried coating film t o give
a dry film thickness of about 160 pm. Then, the test p l a t e s were
d r i e d i n an atmosphere of 23OC and 50% RH f o r 7 days t o obtain
t e s t p l a t e s with an a n t i c o r r o s i v e coating film having a f i l m
thickness of about 320 Dm.
The condition for attachment ofthe composition that gives
a spray dust is one for recreating a condition similar to one
exemplary condition for attachment of spray dust that can occur
when the composition of the present invention is used in a place
5 where coating is performed.
[01201 After that, an X-shaped incision was formed on
surfaces of the anticorrosive coating films ofthe obtainedtest
plates with the anticorrosive coating film. An adhesive
cellophane tape was stuck onto the X-shaped incision and one end
10 of the tape was peeled off at an angle close to 90 degrees with
respect to the surfaces of the anticorrosive coating films to
evaluate a peeling state between the anticorrosive coating films
(a peeling rate) according to the following criteria. Numerical
values ofthe following evaluation criteria were estimatedinthe
15 same manner as the above description (5).
(Evaluation Criteria)
A: No peeling is observed.
B: Peeling rate is from 1 to 15% of the entire film.
C: Peeling rate is more than 15% of the entire film.
20 [0121] (6-2)
E a c h o f t e s t p l a t e s h a v i n g a s i z e o f 1 5 0 x 7 0 x 1 . 6 (thickness)
mm was placed in such a manner that a surface thereof was
substantially vertical with respect to gravity, and then coated
with each of the anticorrosive coating compositions obtained in
the Examples andcomparative Examples below such that anobtained
anticorrosivecoatingfilmhada filmthickness of160 pm, thereby
obtaining test plates with the coating film.
A coating film surface of each of the obtained test plates
5 with the coating filmwas coated with the same composition as that
used to form the coating film, by spray coating from a height of
about 1.5 m above the test plate, whereby the composition which
gives a spray dust through drying, was attached to about 95% or
more of a surface area of the coating film. Immediately after
10 the attachment of the composition, the obtained test plate with
the composition that gives a spray dust was placed in a plastic
box at a height position of 8 cm from the bottom of the box, the
plastic box having an opened top part with a size of 60 x 40 x
30 (height) cm, and having 200 g of xylene sprayed on a bottom
15 thereof. Then, the test plate was dried for 1 day.
The condition for attachment ofthe composition that gives
a spray dust and the condition for drying after the attachment
are those for recreating conditions similar to one example of
conditions for attachment of spray dust that can occur when the
20 composition of the present invention is used in a place where
coating is performed.
101221 After drying in the above atmosphere for 1 day, the
same composition as that used to form the coating film was again
spray coated on obtained test plates with a dried coating film
t o g i v e a d r y f i l m t h i c k n e s s o f a b o u t 1 6 0 p m . Then, t h e t e s t p l a t e s
were dried i n an atmosphere of 23OC and 50% RH f o r 7 days t o obtain
t e s t p l a t e s with an a n t i c o r r o s i v e coating film having a f i l m
thickness of about 320 pm.
5 [0123] After t h a t , an X-shaped i n c i s i o n was formed on
surfaces o f t h e anticorrosive coating films of the o b t a i n e d t e s t
p l a t e s with the a n t i c o r r o s i v e coating film. Next, an adhesive
cellophane tapewas stuck o n t o t h e x - s h a p e d i n c i s i o n , and one end
of the tape was peeled off a t an angle close t o 90 degrees with
10 respect t o the surface of the a n t i c o r r o s i v e coating film t o
evaluate a peeling s t a t e between the a n t i c o r r o s i v e coating films
(a peeling r a t e ) according t o the following c r i t e r i a . Numerical
values o f t h e following evaluation c r i t e r i a w e r e e s t i m a t e d i n t h e
same manner as the above d e s c r i p t i o n ( 5 ) .
15 (Evaluation C r i t e r i a )
A: No peeling is observed.
B: Peeling r a t e is from 1 t o 15% of the e n t i r e film.
C: Peeling r a t e is more than 15% of the e n t i r e film.
[01241 (6-3)
20 Peeling s t a t e s between a n t i c o r r o s i v e coating f i l m s
(peeling rates) were evaluated according t o the following
c r i t e r i a i n the same manner as (6-2), except t h a t the height from
the t e s t p l a t e s in the attachment of the composition t h a t gives
a spray dust due t o drying was changed from about 1.5 m t o about
3.0 m in the (6-2) . Numerical values of the following evaluation
criteriawereestimatedinthesamemannerastheabovedescription
(5)
(Evaluation Criteria)
5 A: No peeling is observed.
B: Peeling rate is from I to 15% of the entire film.
C: Peeling rate is more than 15% of the entire film.
[0125] (7) Anti-Sagging Properties
A viscosity of each of the anticorrosive coating
10 compositions obtained in the Examples and Comparative Examples
below was adjusted to 2000 mPa.s/25OC using xylene. The obtained
each anticorrosive coating composition was coated to give a dry
coating film thickness of 300 pm, 400 pm, or 500 pm on each test
plate placed in such manner that a surface thereof was
15 substantially parallel to gravity, using an airless coating
machine. The states of the coating films (or the anticorrosive
coating films) left for 1 day after the coating were visually
observed to evaluate anti-sagging properties according to the
following criteria:
20 (Evaluation Criteria)
A: When the dry coating film thickness is 500 pm, sagging
is less than 5 mm.
AB: When the dry coating film thickness is 500 pm, sagging
is 5 mm or more, whereas when the dry coating film thickness is
400 pm, sagging is less than 5 mm.
B: When the dry coating film thickness is 400 pm, sagging
is 5 mm or more, whereas when the dry coating film thickness is
300 pm, sagging is less than 5 mm.
5 C: When the dry coating film thickness is 300 pm, sagging
is 5 mm or more.
[0126] Table 1 below shows materials used in Examples of the
present invention.
[0127] Table 1
(Note 1) I "E-028-90X"(Product name): bisphenol A-type liquid epoxy resin, nonvolatile content 90% / . - I (manufactured by ohtake-~eishinc hemical-CO., ~td).
(Note 2) I "E-834-85X"(Product name): bisphenol A-type semi-solid epoxy resin, nonvolatile content:
- . I (manufactured by Rutgers Chemicals AG)
(Note 5) I "HILENOL PL-1000S"(Product name): liquid hydrocarbon resin, nonvolatile content 97%
(Note 3)
(Note 4)
I (manufactured by Kolon Chemical Co., Ltd.)
- -
85% (manufactured by Ohtake-Meishin Chemical Co., Ltd.)
"NEOPOLYMER E-100": hydroxyl group-containing petroleum resin, softening point: 100°C
(manufactured by Nippon Petrochemicals Co. Ltd.)
"NOVARES CA 100": hydroxyl group-containing coumarone resin, softening point 100°C
/ Minerals Ltd. )
- -
(Note 10) I "TITANIUM WHITE R-5N": titanium white (titanium dioxide, manufactured bv Sakai Chemical
(Note 6)
(Note 7)
(Note 8)
(Note 9)
"KBM403"(Productname) : silane couplingagent (manufacturedby Shin-EtsuChemical Co., Ltd.)
"TALC F-2"(Product name): talc (manufactured by Fuji Talc Industrial Co., Ltd.)
"SUZORITE MICA 200-HK" (Product name): mica (manufactured by Kuraray Trading Co., Ltd.)
"POTASSIUM FELDSPAR KM325" (Product name) : potassium feldsuar(manufactured bv Commercial
(Note 11)
(Note 12)
Industry Co., Ltd. )
"TAROX LL-XLO": yellow iron oxide (manufactued by Titan Kogyo, Ltd.)
"ASA T-250F"(Product name) : fatty acid amide wax (manufactuerd by Itoh Oil Chemicals Co.,
(Note 13)
(Note 14)
Ltd.)
"DISPARLON 6650"(Product name) : fatty acid amide wax (manufactured by Kusumoto Chemicals,
Ltd. )
"ASA D-12O"(Product name): oxidized polyethylene, nonvolatile content: 20% (manufactuerd
(Note 15)
(Note 16)
- - I content 65% (manufactured by Ohtake-Meishin Chemical c;. , itd.)-
(Note 20) I "ANCAMINE K-54"(Product name): tertiary mine (manufactured by Air Products Japan, Inc.)
. - -
by Itoh Oil Chemicals Co., Ltd.)
"BENTONE SD-2"(Product name): organic bentonite (manufactured by Elementis Specialties,
Inc.)
"AEROSIL R972"(Product name): silicon dioxide (surface-treated product) (manufactured bv
(Note 17)
(Note 18)
(Note 19)
.
Nippon Aerosil Co., Ltd.)
"AEROSIL 200"(Product name): silicon dioxide (manufactured by Nippon Aerosil Co., Ltd.)
"PA-290 (A)"(Product name): polyamideamine, active hydrogen equivalent 277, nonvolatile
content 59% (manufactured by Ohtake-Meishin Chemical Co., Ltd.)
"MAD-204(A)" (Productname):modifiedpolyamine, activehydroqenequivalent202. nonvolatile
[0128] [Example 11
As shown in Table 2 below, 19 parts by weight of an epoxy
resin (Note I), 10 parts by weight of a petroleum resin (Note 3),
4 parts by weight of a liquid petroleum resin (Note 5), 5.5 parts
5 by weight of xylene, 1 part by weight of butanol, 1 part by weight
of PGM, 1 part by weight of a silane coupling agent (Note 6), 23
parts by weight of talc (Note 7), 6 parts by weight of mica (Note
8), 15 parts by weight of potassium feldspar (Note 9), 6 parts
byweightoftitaniumwhite (Note lo), 1 . 5 p a r t s b y w e i g h t o f y e l l o w
10 iron oxide (Note ll), and 7 parts by weight of oxidized
polyethylene wax (Note 14) were placed in a container. Then,
glass beads were added thereto and these mixing components were
mixed together using a paint shaker. Next, the glass beads were
removed to prepare a main agent component.
15 [0129] In addition, as shown in Table 2 below, 9.4 parts by
weight ofpolyamideamine (Note181, 4.7partsbyweightofmodified
polyamine (Note 19), 0.1 parts by weight of tertiary amine (Note
20), and 0.8 parts by weight of PGM were mixed together by a high
speed disper to prepare a curing agent component.
Theobtainedmainagentcomponentandcuringagentcomponent
were mixed together before coating to prepare a composition.
[0130] [Examples 2 to 10 and Comparative Examples 5 to 61
Compositions were prepared in the same manner as Example
1, except that components to be mixed and mixing amounts thereof
in the main agent component and the curing agent component were
changed as those shown in Table 2 below.
[0131] [Comparative Examples 1 to 41
Components to be mixed and mixing amounts thereof in the
5 main agent component and the curing agent component were changed
to those as shown in Table 2 below. Additionally, in the
preparation of the main agent component, the mixing component of
each composition of Table 2 was dispersed by a paint shaker, as
in Example 1, and then glass beads were removed, followed by
10 dispersion at from 56 to 60°C by a high speed disper. After that,
the resultant was cooled down to 30°C or less to prepare a main
agent component. The curingagentwaspreparedinthe samemanner
as Example 1.
[0132] Table 2

resistance
properties
Reference Signs List
[0133] 1: ~nticorrosive coating film
2: X-shaped incision
3: Incision-formed area
CLAIMS
1. An anticorrosive coating composition for use in the
formation of an anticorrosive coating film having a dry film
thickness of100 pmormore, the anticorrosive coating composition
5 comprising an epoxy resin (A), a curing agent (B), a silane
coupling agent ( C ) , an oxidized polyethylene wax (D), and an
extender pigment (E), but substantially comprises no fatty acid
amide wax.
2. The anticorrosive coating composition according to
10 Claim 1, which is used under conditions in which spray dust of
the anticorrosive coating composition attaches.
3. The anticorrosive coating composition according to
Claim 1 or 2, wherein the composition comprises the oxidized
polyethylene wax (D) in an amount of from 0.01 to 3% by weight
15 (a nonvolatile content) with respect to 100% by weight of a
nonvolatile content of the anticorrosive coating composition.
4. The anticorrosive coating composition according to any
one of Claims 1 to 3, further comprising bentonite and fine
powdered silica.
20 5. The anticorrosive coating composition according to
Claim 4, wherein the fine powdered silica is a hydrophobic fine
powdered silica.
6. The anticorrosive coating composition according to any
one of Claims 1 to 5, wherein the silane coupling agent (C) is
an epoxy group-containing alkoxysilane compound.
7. The anticorrosive coating composition according to any
one of Claims 1to 6, wherein the composition comprisesthe silane
coupling agent (C) in an amount of from 0.01 to 10 parts by weight
5 with respect to 100 parts by weight (a nonvolatile content) of
the anticorrosive coating composition.
8. The anticorrosive coating composition according to any
one of Claims 1 to 7, wherein the extender pigment (E) comprises
atleastonepigmentselectedfromthe group consistingof silica,
10 bariumsulphate, calciumcarbonate, talc, baritepowder, dolomite
and feldspar, and a flaky pigment ( F ) .
t
9. Tpe anticorrosive coating composition according to any
one of Claims 1 to 8, which is used for spray coating.
, .
. . . a.
. .~
.- 10. An anticorrosive coating film formed . . from the
-15 anticorrosive coating compositidn according to any one of Claims
11. A method for preventing corrosion of a substrate,
comprising a step of coating the substrate with the 'anticorrosive
coating composition according to any one of Claims 1 to 9.