Description:FIELD OF THE INVENTION
[0001] The present disclosure relates to technical field of sealant composition. In particular, the present disclosure is directed to utilization of green and industrial waste materials for the development of durable two-component polyurethane sealants which are heat resistant; and a method for preparing thereof.

BACKGROUND OF THE INVENTION
[0002] The background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Generally polyurethane sealants comprise at least one urethane prepolymer which has further reacted with secondary amine compounds containing two silane groups. U.S. Pat. No. 4,687,533 describes a polyurethane sealant containing urethane prepolymers which contain silane groups prepared by reacting a polyisocyanate having at least three isocyanate groups with less than an equivalent amount of an alkoxysilane. Alkoxysilane having a terminal group containing active hydrogen atoms reacts with isocyanate groups to form an isocyanatosilane having at least two unreacted isocyanate groups. In a second step, the isocyanatosilane is mixed with additional polyisocyanate and the mixture is reacted with a polyol to form a polyurethane prepolymer having terminal isocyanato groups and pendant alkoxysilane groups.
[0004] However, the limitation of existing sealants is that it offers less bonding energy to surfaces having less surface area e.g., glass, ceramic etc. which necessitates using primer prior to application and the second limitation is that these types of sealants are less resistant to atmospheric heat. The application of primer increases the cost of the sealant and it also gives out undesirable odour.
[0005] Despite all the advances in the art, there still exists a need for two component polyurethane sealant with focus on the use of green material and this provides an opportunity to work on sustainable technology. The present disclosure satisfies these needs and provides further related advantages.
OBJECTS OF THE INVENTION
[0006] Objects of the present disclosure include the utilization of green and industrial waste materials for the development of durable polyurethane sealant composition, which is heat resistant.
[0007] An object of the present disclosure is to use the waste coming from the stone industry as filler and the chain extender in the sealant composition.
[0008] An object of the present disclosure is to use vegetable oil as the green source of hydroxylated polyol.
[0009] Another object of the present disclosure is to develop a sustainable two component polyurethane sealant composition by utilizing Industrial waste and bio-based or renewable material to maintain carbon dioxide balance in the environment.
[00010] Yet another object of the present disclosure is to provide a green method to develop a sustainable two component polyurethane sealant composition by utilizing Industrial waste and bio-based or renewable material to maintain carbon dioxide balance in the environment.

SUMMARY OF THE INVENTION
[00011] Aspects of this disclosure relates to technical field of sealant composition. In particular, the present disclosure is directed to utilization of green and industrial waste materials for the development of durable two-component polyurethane sealants which are heat resistant; and a method for preparing thereof.
[00012] In an aspect, the present disclosure is directed to the use of waste coming from the stone industry as filler and the chain extender in the sealant composition.
[00013] In an aspect, the present disclosure is directed to the use of vegetable oil as the green source of hydroxylated polyol.
[00014] In one embodiment, the present invention provides A sustainable, heat resistant two component polyurethane sealant composition, said sealant composition comprises:
Component A: resin containing bifunctional active hydroxyl bearing linear polyester polyol, a green source of hydroxylated polyol, a catalyst, a filler, and a chain extender;
Component B: a curing agent comprising; and
One or more additives.
[00015] In another aspect, the present disclosure is directed to developing a sustainable two component polyurethane sealant composition by utilizing Industrial waste and bio-based or renewable material to maintain carbon dioxide balance in the environment.
[00016] In yet another aspect, the present disclosure is directed to provide a green method to develop a sustainable two component polyurethane sealant composition by utilizing Industrial waste and bio-based or renewable material to maintain carbon dioxide balance in the environment.
[00017] In yet another aspect, the present disclosure is directed to provide a green method to develop a sustainable two component polyurethane sealant composition, said method comprises the steps of:
a. providing plasticizer, antifoaming agent and moisture scavenging agent, followed by mixing by stirring using an anchor to obtain a mixture;
b. adding inorganic pigments, filler, antioxidant, HALS and adhesion promoter to the mixture from step a), followed by mixing by stirring using an anchor to obtain a homogeneous paste;
c. adding polyester resin, solvent and catalyst to the homogeneous paste, followed by mixing by stirring using an anchor to obtain Component A;
d. providing Component B comprising a curing agent;
e. adding component B to component A to obtain the two-component sealant.
[00018] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments.
DETAILED DESCRIPTION OF THE INVENTION
[00019] The following is a detailed description of embodiments of the present disclosure. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[00020] Unless the context requires otherwise, throughout the specification which follow, the word “comprise” and variations thereof, such as, “comprises” and “comprising” are to be construed in an open, inclusive sense that is as “including, but not limited to.”
[00021] Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
[00022] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[00023] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, process conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable.
[00024] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein.
[00025] All methods described herein can be performed in suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[00026] The headings and abstract of the invention provided herein are for convenience only and do not interpret the scope or meaning of the embodiments.
[00027] Various terms are used herein. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[00028] The present disclosure relates to technical field of sealant composition. In particular, the present disclosure is directed to utilization of green and industrial waste materials for the development of durable two-component polyurethane sealants which are heat resistant; and a method for preparing thereof.
[00029] In various embodiments, the sealant composition disclosed herein further includes one or more additives. Exemplary additives include, but not limited to, Polyester resin, Antioxidant, catalyst, Anti-bubble agent, Moisture scavenging agent, hindered amine stabilizer (HALS), Adhesion promoter, solvent, and inorganic pigment, including any mixtures thereof.
[00030] In one embodiment, the present invention provides A sustainable, heat resistant two component polyurethane sealant composition, said sealant composition comprises:
Component A: resin containing bifunctional active hydroxyl bearing linear polyester polyol, a green source of hydroxylated polyol, a catalyst, a filler, and a chain extender;
Component B: a curing agent comprising; and
One or more additives.
[00031] In an embodiment, the curing agent is selected from but not limited to bifunctional polyurethane prepolymers based on diphenylmethane-diisocyanates having free isocyanates groups.
[00032] In an embodiment, the hindered amine stabilizer (HALS) present in the sealant composition helps to stop chain scission reaction in prepolymer. HALS do not absorb UV radiation but inhibit the degradation of polymer by regular removal of free radicals released during chain scission reaction, which will stabilize and stop the further degradation of polymer. In an embodiment, the HALS are selected from but not limited to Tinuvin 770 DF, Tinuvin or combinations thereof, and the like. The HALS may be present at concentrations of 0.1 to 0.2 wt %;
[00033] In an embodiment, the green source of hydroxylated polyol in Component A, may be present at concentrations of 0.5 to 8 wt. %. The green source of hydroxyl polyol includes but not limited to vegetable oil, castor oil, lignin and the like, because most of these compounds obtained by crude oil which is a non-renewable source. In an embodiment of the present invention, the green source of hydroxylated polyol is used to replace part of the bifunctional active hydroxyl bearing linear polyester polyol.
[00034] In an embodiment, the plasticizer in Component A is selected from but not limited to paraffin wax, chlorinated paraffin wax, and the like. The plasticizer may be present at concentrations of 20 to 60 wt %.
[00035] In an embodiment, the filler and the chain extender in Component A are the waste coming from the stone industry. The filler and the chain extender may be present at concentrations of 20 to 65 wt %.
[00036] In an embodiment, the curing agent comprising bifunctional polyurethane prepolymers based on diphenylmethane-diisocyanates having free isocyanates groups is selected from but not limited to 2,4-diphenyl-methane diisocyanate, 4,4'-diphenyl-methane diisocyanate, and the like.
[00037] In an embodiment, the catalyst of the sealant composition is selected from but not limited to organometallic derivatives of tetravalent tin, trivalent and pentavalent As, Sb and Bi and metal carbonyls of iron and cobalt, or mixtures there of; tertiary amines including but not limited to tertiary amines , triethylene diamine (TEDA), dimethylpiperazine (DMP), dimethylethanolamine (DMEA), and diazabicyclooctane (DABCO), as well as tin compounds like dibutyltin dilaurate (DBTDL), and the like. Most preferably tertiary amines, may be present at concentrations of 0.02 to 0.8 wt %.
[00038] In an embodiment, the antioxidant of the sealant composition is selected from but not limited to 2,6-di-t-butyl phenol, 2,4-di-t-butyl phenol, n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 2,6-di-t-butyl-4-methyl phenol, 2,5-di-t-butylhydroquinone, pentaerythrityl-tetrakis [3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate], 4,4'-butylidenebis(3-methyl-6-t-butyl phenol), 4,4'-thiobis(3-methyl-6-t-butyl phenol),2,2'-methylenebis(4-methyl-6-t-butyl phenol), N,N'-diphenyl-p-phenylenediamine, 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, 4,6-bis(octylthiomethyl)-o-cresol and the antioxidants known in the art. Most preferably 4,6-bis(octylthiomethyl)-o-cresol, may be present at concentrations of 0.3 to 2.5 wt %.
[00039] In an embodiment, the inorganic pigments of the sealant composition is selected from but not limited to silica, calcium carbonate, magnesium carbonate, titanium oxide, iron oxide, barium sulphate, Zinc oxide and carbon black. In an embodiment, the pigments can have any suitable particle size, the filler particle size can be from 50 nm to 50 µm, in some cases 100 nm to 10 µm, and in other cases from 250 nm to 1 µm. When pigments are used, they can be used to increase the tensile strength of the cured material. Most preferably calcium carbonate, may be present at concentrations of 0 0.02-0.1 wt %.
[00040] In an embodiment, the anti-bubbling agent (or antifoaming agent) of the sealant composition is selected from but not limited to Organo-modified polysiloxane, hydrocarbon based anti-bubbling agents, silicon free anti-bubbling agents, and the like. The anti-bubbling agent may be present at concentrations of 0.9 to 5.0 wt %.
[00041] In an embodiment, the moisture scavenging agent of the sealant composition is selected from but not limited to molecular sieve of alkali earth metals, monomeric carbodiimide, and the like. The moisture scavenging agent may be present at concentrations of 0.3 to 2.0 wt %.
[00042] In an embodiment, the solvent of the sealant composition is selected from but not limited to organic solvents like Xylene, toluene, and the like. The solvent may be present at concentrations of 0.6 to 3 wt %.
[00043] In an embodiment, the bifunctional active hydroxyl bearing linear polyester polyol is selected from but not limited to polyester resin. The polyester resin may be present at concentrations of 20 to 60 wt %.
[00044] In an embodiment, the adhesion promoter of the sealant composition is selected from but not limited to dioctyl phthalate (DOP) dibutyl phthalate (DBP); diethylene glycol dibenzoate, pentaerythritol ester; butyl oleate, methyl acetylricinoleate;diisodecyl phthalate (DIDP); dioctyl adipate isodecyl malonate; tricresyl phosphate and trioctyl phosphate; polypropylene glycol adipate and polybutylene glycol adipate; and the like; or combinations thereof. Most preferably, DOP or DBP, may be present at concentrations of 0.5 to 3.0 wt %.
[00045] In one particular embodiment of the invention, the component A is present at a level of least 10%, at least 15%, at least 20%, at least 25%, 30% or is present at a level of up to 95%, up to 94%, up to 93%, up to 92%, up to 91%, up to 90%, up to 85% and in other situations up to 70% by weight of the two-component composition. The component A can be present in the two-component composition at any level stated above and can range between any level stated above.
[00046] In one particular embodiment of the invention, the component B is present at a level of least 5%, at least 6%, at least 7%, at least 8%, 9% or is present at a level of up to 30%, up to 25%, up to 20%, up to 15%, up to 10%, up to 9% and in other situations up to 80% by weight of the two-component composition. The component B can be present in the two-component composition at any level stated above and can range between any level stated above.
[00047] In one particular embodiment of the invention, the ratio of component A and component B present in the final sealant composition is 92%:8%.
[00048] In one exemplary embodiment, the sealant composition of this disclosure comprises, based on the total volume of the composition:
Component A: Plasticizer— 20 to 60 wt %; Hydroxy Polyols — 0.5 to 8 wt %; Polyester resin — 20 to 60 wt %; Antioxidant—0.3 to 2.5 wt %; Anti-bubble agent—0.9 to 5.0 wt.%; Moisture scavenging agent—0.3 to 2.0 wt %; Adhesion promoter—0.5 to 3.0 wt %; Filler—20 to 65 wt %; Catalyst—0.02 to 0.8 wt %; Solvent—0.6 to 3 wt %; Inorganic Pigment — 0.02-0.1 wt %; HALS 0.1 to 0.2 wt %; and
Component B: the curing agent — 8.0 to 20 wt %.
[00049] In another exemplary embodiment, the sealant composition of this disclosure comprises, based on the total volume of the composition:
Component A: Plasticizer—20 to 60 wt %; Hydroxy Polyols—0.5 to 8 wt %; Polyester resin — 20 to 60 wt %; Antioxidant—0.3 to 1.0 wt %; Anti-bubble agent—1.0 to 5.0 wt %; Moisture scavenging agent—0.3 to 1.0 wt %; Adhesion promoter—0.5 to 2.0 wt %; Filler—20 to 60 wt %; Catalyst—0.02 to 0.8 wt %; Solvent—0.6 to 2 wt %; Inorganic Pigment — 0.02-0.08 wt %; HALS 0.1 to 0.2 wt %; and
Component B: the curing agent — 8.0 to 20 wt %.
[00050] In another exemplary embodiment, the sealant composition of this disclosure comprises, based on the total volume of the composition:
Component A: Plasticizer—20 to 40 wt %; Hydroxy Polyols—1.0 to 5 wt %; Polyester resin — 30 to 60 wt %; Antioxidant—0.5 to 2.0 wt %; Anti-bubble agent—1.0 to 3.0 wt.%; Moisture scavenging agent—0.5 to 2.0 wt %; Adhesion promoter—0.8 to 2.5 wt %; Filler—30 to 60 wt %; Catalyst—0.02 to 0.5 wt %; Solvent—1.0 to 3 wt %; Inorganic Pigment — 0.02-0.05 wt %; HALS 0.1 to 0.2 wt %; and
Component B: the curing agent — 5.0 to 15 wt %.
[00051] In yet another exemplary embodiment, the sealant composition of this disclosure comprises, based on the total volume of the composition:
Component A: Plasticizer—34 to 42 wt %; Hydroxy Polyols—2.0 to 6 wt %; Polyester resin — 25 to 55 wt%; antioxidants—1.0 to 2.5 wt %; Anti-bubble agent—0.9 to 2.0 wt %; Moisture scavenging agent—0.5 to 2.0 wt %; adhesion promoter—1.0 to 3.0 wt %; filler—40 to 65 wt %; catalyst—0.02 to 0.5 wt %; solvent—1.0 to 2.5 wt %; Inorganic Pigment — 0.02-0.1 wt %; HALS 0.1 to 0.2 wt %; and
Component B: the curing agent — 8.0 to 20 wt %.
[00052] In another aspect, the present disclosure is directed to provide a green method to develop a sustainable two component polyurethane sealant composition, said method comprises the steps of:
a. providing plasticizer, antifoaming agent and moisture scavenging agent, followed by mixing by stirring using an anchor to obtain a mixture;
b. adding inorganic pigments, filler, antioxidant, HALS and adhesion promoter to the mixture from step a), followed by mixing by stirring using an anchor to obtain a homogeneous paste;
c. adding polyester resin, solvent and catalyst to the homogeneous paste, followed by mixing by stirring using an anchor to obtain Component A;
d. providing Component B comprising a curing agent;
e. adding component B to component A to obtain the two-component sealant.
[00053] In yet another exemplary embodiment, the component A and Component B are mixed in the ratio of 92:8, respectively.
[00054] The sealant composition of the present disclosure is useful in bonding with concrete, metal, glass or any other composite substrates with and without use of coupling agent containing primer.
[00055] While the foregoing description discloses various embodiments of the disclosure, other and further embodiments of the invention may be devised without departing from the basic scope of the disclosure. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
EXAMPLES
[00056] The present disclosure is further explained in the form of following examples. However, it is to be understood that the foregoing examples are merely illustrative and are not to be taken as limitations upon the scope of the invention. Various changes and modifications to the disclosed embodiments will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the scope of the invention.
[00057] Example 1:
A two-component sealant composition was prepared using the ingredients and quantities thereof listed in the below Table 1.
Table 1
Component Ingredient Quantity
Component A Plasticizer (chlorinated paraffin wax) 40 wt %
Hydroxy Polyols (Castor Oil) 6.5 wt %
Polyester resin (2,4-diphenyl-methane diisocyanate) 13.5 wt %
Antioxidant (pentaerythrityl-tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate)
0.35wt %
Anti-bubble agent (BYK 1680) 0.1 wt.%
Moisture scavenging agent (Molecular sieve of alkali metal) 0 1.0 wt %
Adhesion promoter (phenolic resin) 0.5 wt %
Filler (calcium carbonate) 37.0 wt %
Catalyst (DBTDL) 0.02 wt %
Solvent (Xylene) 1.0 wt %
Inorganic Pigment (Black Oxide) 0.02 wt %
HALS(Tinuvin-770) 0.01 wt%
Component B Curing agent (PAPI-27) 3.4 wt %

[00058] Example 2:
A two component sealant composition was prepared using the ingredients and quantities thereof listed in the below Table 2.
Table 2
Component Ingredient Quantity
Component A Plasticizer (chlorinated paraffin wax) 35% wt %
Hydroxy Polyols (Castor Oil) 4.0 wt %
Polyester resin (4,4'-diphenyl-methane diisocyanate) 17.0 wt %
Antioxidant (4,6-bis(octylthiomethyl)-o-cresol) 0.2 wt %
Anti-bubble agent (DYN D765) 0.15 wt.%
Moisture scavenging agent (Molecular sieve of alkali metal) 0.5 wt %
Adhesion promoter(DOP) 0.7 wt %
Filler (Barium sulphate) 40.80 wt %
Catalyst (DBTDL) 0.06 wt %
Solvent (Toluene) 1.5 wt %
Inorganic Pigment (Black Oxide)) 0.07 wt %
HALS(Tinuvin-770) 0.02 wt%
Component B Curing agent (Desmodur 44 V20 L) 3.2 wt %

[00059] Example 3:
A two component sealant composition was prepared using the ingredients and quantities thereof listed in the below Table 3.
Table 3
Component Ingredient Quantity
Component A Plasticizer (Chlorinated paraffin Wax) 38.0 wt %
Hydroxy Polyols (Castor oil) 7.5 wt %
Polyester resin (2,4-diphenyl-methane diisocyanate) 12.0 wt%
Antioxidant (n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate) 0.25 wt %
Anti-bubble agent (Tri-butyl Phosphate) 0.09 wt %
Moisture scavenging agent (monomeric carbodiimide) 0.85 wt %
Adhesion promoter (DBP) 1.5 wt %
Filler (Soap stone powder) 37.85 wt %
Catalyst (DABCO) 0.1 wt %
Solvent (Xylene) 1.8 wt %
Inorganic Pigment (Black Oxide) 0.05 wt %
HALS(Tinuvin-770) 0.015 wt %
Component B Curing agent (Polymerk MDI) 3.4 wt %

, Claims:1. A sustainable, heat resistant two component polyurethane sealant composition, said sealant composition comprises:
Component A: resin containing bifunctional active hydroxyl bearing linear polyester polyol, a green source of hydroxylated polyol, a catalyst, a filler, and a chain extender;
Component B: a curing agent; and
One or more additives,
wherein, the green source of hydroxylated polyol in Component A is selected from vegetable oil, castor oil, lignin and the like; and
wherein, the filler and the chain extender in Component A are the wastes coming from the stone industry.
2. The sealant composition as claimed in claim 1, wherein the one or more additives consisting essentially of plasticizer, Polyester resin, Antioxidant, Anti-bubble agent, Moisture scavenging agent, Adhesion promoter, solvent, hindered amine stabilizers (HALS), and inorganic pigment.
3. The sealant composition as claimed in claim 1, wherein the bifunctional active hydroxyl bearing linear polyester polyol is polyester resin
4. The sealant composition as claimed in claim 1, wherein the curing agent is bifunctional polyurethane prepolymers based on diphenylmethane-diisocyanates having free isocyanates groups.
5. The sealant composition as claimed in claim 1, wherein the bifunctional polyurethane prepolymers based on diphenylmethane-diisocyanates having free isocyanates groups is selected from but not limited to 2,4-diphenyl-methane diisocyanate, 4,4'-diphenyl-methane diisocyanate, and the like.
6. The sealant composition as claimed in claim 2, wherein the catalyst is selected from but not limited to tertiary amines.
7. The sealant composition as claimed in claim 2, wherein the antioxidant is 4,6-bis(octylthiomethyl)-o-cresol..
8. The sealant composition as claimed in claim 2, wherein the inorganic pigment is calcium carbonate.
9. The sealant composition as claimed in claim 2, wherein the anti-bubbling agent of the sealant composition is selected from but not limited to Organo-modified polysiloxane, hydrocarbon based anti-bubbling agents, silicon free anti-bubbling agents.
10. The sealant composition as claimed in claim 2, wherein the moisture scavenging agent of the sealant composition is selected from but not limited to molecular sieve of alkali earth metals, monomeric carbodiimide, and the like.
11. The sealant composition as claimed in claim 2, wherein the solvent of the sealant composition is selected from but not limited to Xylene, toluene, and the like.
12. The sealant composition as claimed in claim 2, wherein the adhesion promoter is selected from dioctyl phthalate (DOP) or dibutyl phthalate (DBP).
13. The sealant composition as claimed in claim 2, wherein the plasticizer is selected from parafin wax, clorinated parafin wax, and the like.
14. The sealant composition as claimed in claim 2, wherein the HALS is selected from but not limited to Tinuvin 770 DF, Tinuvin, or combinations thereof, and the like.
15. The sealant composition as claimed in claim 2, wherein the bifunctional active hydroxyl bearing linear polyester polyol is polyester resin.
16. The sealant composition as claimed in any of claims 1 to 12 comprising, based on the total weight of the sealant composition:
Component A: Plasticizer— 20 to 60 wt %; Hydroxy Polyols — 0.5 to 8 wt %; Polyester resin — 20 to 60 wt %; Antioxidant—0.3 to 2.5 wt %; Anti-bubble agent—0.9 to 5.0 wt.%; Moisture scavenging agent—0.3 to 2.0 wt %; Adhesion promoter—0.5 to 3.0 wt %; Filler—20 to 65 wt %; Catalyst—0.02 to 0.8 wt %; Solvent—0.6 to 3 wt %; Inorganic Pigment — 0.02-0.1 wt %; HALS 0.1 to 0.2 wt % and
Component B: the curing agent — 8.0 to 20 wt %.
17. The sealant composition as claimed in any of claims 1 to 13 comprising, based on the total weight of the sealant composition:
Component A: Plasticizer—20 to 60 wt %; Hydroxy Polyols—0.5 to 8 wt %; Polyester resin — 20 to 60 wt %; Antioxidant—0.3 to 1.0 wt %; Anti-bubble agent—1.0 to 5.0 wt %; Moisture scavenging agent—0.3 to 1.0 wt %; Adhesion promoter—0.5 to 2.0 wt %; Filler—20 to 60 wt %; Catalyst—0.02 to 0.8 wt %; Solvent—0.6 to 2 wt %; Inorganic Pigment — 0.02-0.08 wt %; HALS 0.1 to 0.2 wt % and
Component B: the curing agent — 8.0 to 20 wt %.
18. The sealant composition as claimed in any of claims 1 to 13 comprising, based on the total weight of the sealant composition:
Component A: Plasticizer—20 to 40 wt %; Hydroxy Polyols—1.0 to 5 wt %; Polyester resin — 30 to 60 wt %; Antioxidant—0.5 to 2.0 wt %; Anti-bubble agent—1.0 to 3.0 wt.%; Moisture scavenging agent—0.5 to 2.0 wt %; Adhesion promoter—0.8 to 2.5 wt %; Filler—30 to 60 wt %; Catalyst—0.02 to 0.5 wt %; Solvent—1.0 to 3 wt %; Inorganic Pigment — 0.02-0.05 wt %; HALS 0.1 to 0.2 wt %and
Component B: the curing agent — 5.0 to 15 wt %.
19. The sealant composition as claimed in any of claims 1 to 13 comprising, based on the total weight of the sealant composition:
Component A: Plasticizer—34 to 42 wt %; Hydroxy Polyols—2.0 to 6 wt %; Polyester resin — 25 to 55 wt%; antioxidants—1.0 to 2.5 wt %; Anti-bubble agent—0.9 to 2.0 wt %; Moisture scavenging agent—0.5 to 2.0 wt %; adhesion promoter—1.0 to 3.0 wt %; filler—40 to 65 wt %; catalyst—0.02 to 0.5 wt %; solvent—1.0 to 2.5 wt %; Inorganic Pigment — 0.02-0.1 wt %; HALS 0.1 to 0.2 wt % and
Component B: the curing agent — 8.0 to 20 wt %.
20. A method for preparing the sealant composition as claimed in claims 1 to 16, said method comprises the steps of:
a. providing plasticizer, antifoaming agent and moisture scavenging agent, followed by mixing by stirring using an anchor to obtain a mixture;
b. adding inorganic pigments, filler, antioxidant, HALS and adhesion promoter to the mixture from step a), followed by mixing by stirring using an anchor to obtain a homogeneous paste;
c. adding polyester resin, solvent and catalyst to the homogeneous paste, followed by mixing by stirring using an anchor to obtain Component A;
d. providing Component B comprising a curing agent;
e. adding component B to component A to obtain the two-component sealant,
wherein, the component A and Component are mixed in the ratio of 92:8.