The present invention relates to a vehicle fuel tank Specifically, the hybrid vehicle fuel tank steel sheet composite resin composition and this composite resin-coated steel sheet, and this method of manufacturing the fuel tank using.
BACKGROUND
[2]
The material that is typically applied to automobile fuel tank has high physical properties such as stability, heat resistance, durability, and the fuel permeability, and a high design freedom, a suitable characteristic in the car weight is required. Thus, the normal internal combustion engine fuel tank steel sheet is a plated steel sheet with melted (Interstitial Free) IF steel plating (e.g., Al-Si-based, Sn-Zn-based), electroplating (for example, Zn-Ni-based), etc. It is mainly used.
[3]
On the other hand, to the fuel tank of a hybrid vehicle, which shows a rapid growth in recent years the market is less than 80% of the expensive lining (Lining) The treated plastic used, a situation where the other 20% the steel material used.
[4]
Since the hybrid vehicle includes the fuel tank installation space constraints of a complicated shape due to mounting a battery (battery) vehicle, is excellent in formability material is required.
[5]
Recently, a hybrid plug of the car - are there hybrid (Plug-In-Hybrid) is under the spotlight, where the fuel tank is large internal pressure when the power switch of the electric furnace in a fuel difference (approximately ΔP = 20 ~ 30kPa) applied to - the because it occurs, has been used is expensive and the thickness of plastic relative to the lining (lining) treated with humul steel or re-multiplexed in 1.6mm.
[6]
As such, after muljae (thick steel plate) or expensive depending on the use of the material as a material for a hybrid vehicle fuel tank, fuel savings over the vehicle body weight, as well as difficult to reduce the production cost disadvantage.
[7]
Thus, while the above can replace the same material that is, or after muljae expensive plastics, the development of the available material and the body weight savings are required.
[8]
[Prior Art]
[9]
(비특허문헌 1) Development of Exhaust and Evaporative Emissions Systems for Toyota THS II Plug-in Hybrid Electric Vehicle Toyota Motor Corporation, 2010-01-0831, SAE International
[10]
(비특허문헌 2) An Approach for Developing Lightweight Steel Fuel Tanks for Plug-In Hybrid Electric Vehicles (PHEV), SASFT (Strategic Alliance for Steel Fuel Tanks, www.sasft.org)
Detailed Description of the Invention
SUMMARY
[11]
One aspect of the present invention provides a hybrid vehicle fuel in the tank for the material to provide, after been using the conventional muljae or expensive and being able to replace the plastic, composite resin-coated steel sheet for a fuel tank having a high strength and high elongation properties fuel tank steel sheet composite resin composition, the resin composite-coated steel sheet using the same, and that can be intended to provide a production method thereof.
Problem solving means
[12]
One aspect of the present invention, the polymer resin of 30 to 65% by weight; Curing agent from 1 to 15% by weight; Corrosion additives 2-20% by weight; Polyphosphazenes (polyphosphazene) adhesion promoters comprising a polymer compound 1 to 15% by weight; And a fuel tank containing a remainder of the solvent provides a steel sheet a composite resin composition.
[13]
Another aspect of the present invention, the steel sheet; The coating layer formed on at least one surface of the steel sheet; And the composite resin, comprises a composite resin coating layer formed on the plating layer coating layer comprises a polymer resin, 40 to 85% by weight, the curing agent of 3 to 20% by weight, corrosion additives 5 to 25% by weight and the polyphosphazene polymer compound adhesion enhancer comprises a 3 to 20% by weight, the steel sheet provides a composite resin-coated steel sheet for a fuel tank having a tensile strength and elongation more than 35% or more of 800MPa.
[14]
Another aspect of the invention includes the steps of: preparing a steel sheet; Forming a plating layer on at least one side of the steel sheet; Applying a fuel tank steel sheet composite resin composition on top of the plating layer; And the outer coating of the fuel tank steel sheet comprising the step of drying the composite resin composition at 120 to 200 ℃ temperature, and the fuel tank steel sheet composite resin composition comprises a polymer resin of 30 to 65% by weight; Curing agent from 1 to 15% by weight; Corrosion additives 2-20% by weight; Polyphosphazenes (polyphosphazene) adhesion promoters comprising a polymer compound 1 to 15% by weight; And the remainder comprises a solvent, provides a method for producing a resin-coated steel sheet for fuel tank complex.
Effects of the Invention
[15]
According to the present invention, not only the corrosion resistance and excellent in fuel resistance, has the effect to provide a suitable composite resin-coated steel sheet by molding is excellent as a material for use in a hybrid fuel tank is required to be formed in a complicated shape.
[16]
Further, the composite resin of the present invention coated steel sheet is at the same time an effect of reducing costs with the existing hybrid after that has been applied to the fuel tank as the material for, and the effect that can replace muljae, expensive plastics, the weight of the vehicle body from which It can be obtained.
Brief Description of the Drawings
[17]
It shows the relationship between the elongation (El) - 1 is a steel type tensile strength (TS).
[18]
Figure 2 shows schematically a cross-section of the screen to a composite resin-coated steel sheet according to one embodiment of the present invention.
[19]
Figure 3 shows the general formula of the polyphosphazene polymer compound according to one embodiment of the present invention.
[20]
Figure 4 shows the fuel resistance evaluation results compared to myeongyegwa example, according to one embodiment of the present invention.
[21]
Figure 5 shows a comparative example to myeongyegwa seam weldability evaluation result according to an embodiment of the present invention (y-axis: the seam weld zone LME length measurement).
[22]
Figure 6 shows a comparative example to myeongyegwa film adhesiveness evaluation result according to an embodiment of the present invention.
[23]
7 shows the observation results of the appearance of the comparative example to myeongyegwa bendingga study in accordance with one embodiment of the present invention.
Best Mode for Carrying Out the Invention
[24]
The steel sheet is generally at least 35% elongation or more preferably targeted in the present invention is a high-elongation steel sheet having elongation of 50% or more. In the present invention, but holding a high-manganese steel as one example of such a steel sheet, is not necessarily limited thereto.
[25]
At present, mainly used for a general carbon steel, or soft IF steel to steel plates for automobile fuel tanks, these steels have a good ductility, even if does not represent more than 45% elongation.
[26]
On the other hand, it is a steel alloy composition of the manganese content, yet at least about 12% by weight and having an austenite manganese cold rolled steel sheet is formed with a twin crystal (twin) deformation has a characteristic graph showing a 50% or more flexible, with more than 800MPa strength (Fig. One).
[27]
In order to replace the expensive plastic to be used as a material for use in a hybrid fuel tank there is material is required having at least 35% or more, more preferably 50% ductility, the above high manganese cold rolled steel sheet is seen that suitable as a material for use in a hybrid fuel tank can.
[28]
However, high-strength - even in a steel sheet having a high ductility, by itself has corrosion resistance and is susceptible to the limitation of using the material for the panels, especially for fuel tanks.
[29]
Thus, the present invention is the corrosion resistance of the high-elongation is preferably 50% or more than 35%, high elongation steel sheet, and more preferably, as a material for use in a hybrid fuel tank applying the manganese cold rolled steel sheet On the other hand, the high manganese cold rolled steel sheet In order to improve subjected to plating (e.g., electroplating or melt plating) to make a composite resin coating to impart additional corrosion resistance and high lubricity.
[30]
In particular, the present invention is the high there is a technical significance to provide a composite resin composition of a novel composition with the adhesion between the plated layer and the composite resin coating layer, in order to improve the formability of the composite resin coating layer itself is formed on the manganese cold rolled steel sheet.
[31]
Hereinafter, a detailed description of the present invention.
[32]
Fuel tank steel sheet composite resin composition according to an aspect of the present invention is a polymeric resin 30 to 65 wt%; Curing agent from 1 to 15% by weight; Corrosion additives 2-20% by weight; Adhesion promoter from 1 to 15% by weight; And it is preferred to include the balance solvent.
[33]
To the temperature of the fuel in the fuel tank rises above the car during running 90 ℃, the polymer resin has excellent characteristics in heat resistance and chemical resistance for the fuel for this.
[34]
The polymer and the resin has an average molecular weight of 5,000 ~ 50000 to be, it is preferred that the Tg is at least one member selected from 10 to 50 ℃ a urethane, acrylic, polyester and urethane epoxy copolymer. The molecular structure of the polymeric resin but may be contained in the chain, and cross-linked aromatic group.
[35]
The polymer resins it is preferable to contain 30 to 65% by weight of the total composition, and if, and its content, the workability is inferior and less than 30% by weight is insufficient in ductility of the coating layer, while When the content exceeds 65% by weight the hardness of the low hardness coating low, there is a problem you are experiencing symptoms pushed the coating during processing.
[36]
The curing agent has the effect of excellently ensure the fuel resistance and corrosion resistance by forming a dense three-dimensional network structure by reacting with the polymer resin.
[37]
The curing agent is preferably a reactive one or more species of the amine-based curing agent and an isocyanate-based curing agent such as melamine excellent, Ari jidin.
[38]
Also, a melamine-based curing agents of the curing agent is preferably at least one member selected from among melamine, butoxymethyl melamine, hexamethoxymethylmelamine and trimethoxy methyl melamine. On the other hand, the isocyanate is RN = C = O (where, R is -CH 3 , -CH 2 CH 3 , -CH 2 CH 2 CH 3 is or -Ph) may be a compound of the structure.
[39]
The curing agent preferably contains from 1 to 15% by weight. If the content of the curing agent is less than 1% by weight, the curing reaction upon drying the coating film of the composite resin coating layer is not been fully achieved a high possibility that the physical properties of the coating layer is inferior. On the other hand, When the content exceeds 15% by weight of the coated layer hardness is too high is not preferred that the matter worse processing properties.
[40]
The corrosion additive as a component for improving the corrosion resistance of the composite resin coating layer, it is preferred to add to the composite silicate compound and a titanium compound, it is particularly preferred to add a mixture of the silicate compound and a titanium compound.
[41]
The silicate compound is lithium polysilicate, sodium polysilicate, potassium polysilicate and Colo one preferably at least one kind of colloidal silica, not to limit it.
[42]
The amount of the silicate compound is preferably from 1 to 12% by weight. If the silicate compound content of the corrosion resistance improving effect is less than 1% by weight of the ears, while exceeding 12 wt%, the corrosion resistance is improved but there is a problem that the workability becomes rough, lowering the coating layer surface.
[43]
On the other hand, the titanium compound is titanium carbonate, di-isopropyl titanate, triethanol amino, La lactic acid titanium chelate and titanium acetylacetonate one kinds of one or more preferably of, but not limited to.
[44]
The titanium compound is added as even a small amount that is effective to be improved corrosion processed portion, preferably, the titanium compound may contain from 1 to 8% by weight. The corrosion resistance improvement effect when the amount of the titanium compound is less than 1% by weight, minor, and while it is not preferable because of a problem that the content is if it exceeds 8% by weight, manufacturing costs are too high.
[45]
As it described above, in the addition of a mixture of the silicate compound and the titanium compound, the silicate compound and the titanium compound is from 0.5: is preferably added in a weight ratio of 1: 1 to 4. When added to satisfy the above weight ratio, it is possible to sufficiently obtain the effect to be obtained for each compound.
[46]
The adhesion promoter is as to improve the adhesion between the composite resin coating layer and the coating layer is preferably a polymer capable of bonding with the metal of the compound plated layer. As such a polymer compound is preferably added to the polyphosphazene (polyphosphazene) polymer compound. The polyphosphazene polymer compound may be a property that it strongly bound M (metal) -OH in combination with the surface of the plating layer made of a metal, greatly improves the adhesion of the composite resin coating layer.
[47]
The polyphosphazene polymers and compounds having an average molecular weight of 5,000 to 50,000 may preferably has one or more substituted functional group (functional group). The substituted functional group is preferably an alkyl, one or more kinds of the substituted alkyl, aryl, and substituted aryl (Fig. 3). In this case, the alkyl and substituted alkyl is preferably a group having 1 to 10 carbon atoms, and the aryl and substituted aryl is preferably a group having 1 to 5 carbon atoms, the substituted aryl is alkoxy halogen atom or 1 to 4 carbon atoms It may be substituted with a.
[48]
The adhesion promoter preferably comprises from 1 to 15% by weight. During deep drawing and if the amount of the adhesion enhancing agent is less than 1% by weight of the adhesion promoting effect insufficient, there is a problem that the machining graphite chemical conversion inferior. On the other hand, When the content exceeds 15 wt% adhesion is improved but there is a problem that the workability falls and the viscosity of the solution becomes too high.
[49]
Except for the above components and the remaining content of the solvent. The solvent is not particularly limited, it is preferable to use water in consideration of the workability and the environmental resistance. The water refers to deionized or distilled water.
[50]
Hereinafter, the detailed description of the production method of the resin-coated steel sheet for fuel tank complex and this in accordance with another aspect of the present invention.
[51]
The fuel tank composite resin-coated steel sheet is steel sheet; The coating layer formed on at least one surface of the steel sheet; The composite resin coating layer comprises a composite resin coating layer formed on the plating layer is preferably formed from a composite resin composition according to the invention.
[52]
More specifically, the composite resin coating layer preferably comprises a polymer resin, 40 to 85% by weight, the curing agent of 3 to 20% by weight, corrosion additives 5 to 25% by weight adhesion promoter and from 3 to 20% by weight.
[53]
In addition, the corrosion additive it is preferred to include from 3 to 15% by weight of silicate compound and a titanium compound, from 2 to 10% by weight.
[54]
The composite resin coating layer as previously described composite resin composition of the dry coating layer, which corresponds to the remaining ingredients after the volatile materials contained in the composite resin coating layer of all volatiles. Thus, the composite resin coating layer does not include a solvent of water, and does not contain water that contains polymer resin, etc., adhesion promoters. Accordingly, the components contained in the composite resin coating layer corresponds to a content, based on the total solid content of 100% by weight.
[55]
On the other hand, (also referred to as a "hold the steel sheet") steel plate for forming the steel sheet, that is, the coating layer preferably has a manganese (Mn) content of the high manganese cold rolled steel sheet by more than 12% by weight. More specifically, in the present invention, the high manganese cold rolled steel sheet having as the steel sheet If the manganese content in the above-described high strength (tensile strength 800MPa or more) and high ductility (elongation 35% or more) does not specifically limited.
[56]
However, as one example, by weight%, carbon (C): 0.5 to 2.5%, the balance Fe and other inevitable impurities: 0.2% to 1.0%, manganese (Mn): 12 ~ 20%, employs aluminum (S-Al) can be applied to include high manganese cold rolled steel sheet, and may further include a beneficial element, e.g., Si, Cr, Ni or the like to improve the mechanical properties in addition to the above-described alloy components.
[57]
The coating layer formed on one surface of the above steel sheet is preferably in the electroplating layer or the molten coating layer.
[58]
The electroplated layer is of zinc or zinc-nickel alloy plated layer and the plated layer is melted molten zinc, molten zinc alloy, zinc is preferably one of a silicon alloy coating layer-aluminum-magnesium alloy and aluminum.
[59]
The electroplating layer is 40g ~ 5 / m 2 is formed in a single side coating weight of the molten plating layer 60g ~ 20 / m 2 is preferably formed by one side of the adhesion amount. At this time, if the single side coating weight excessively low by the plating method mothamyeo insufficient corrosion resistance improvement of the composite resin-coated steel sheet, on the other hand, if having a high coating weight overly are formed thicker the plated layer, there is a problem that such weldability decreases.
[60]
More preferably, the plating layer is a zinc (Zn) - preferably in the nickel alloy electroplating layer - nickel (Ni) the zinc alloy prepared from the electroplating. In this case, the zinc-nickel alloy electroplating layer preferably has a nickel content within the range of 5 to 15% by weight.
[61]
Formed on the above-mentioned plated layer composite resin coating layer has a cross-sectional structure as shown in Fig. Here, it is preferable that the weight ratio between the Si and Ti and P {([Si] + [Ti]) / [P]} satisfies 0.5 to 1.5. When the magnetic treatment of the above weight ratio is less than 0.5 when the composite resin coating layer insufficient, while above 1.5, there is a problem that the adhesion between the plating layer decreases. The Si, Ti, and is derived from a corrosion additive containing a silicate compound and a titanium compound, wherein P is derived from the adhesion promoter comprising a polyphosphazene polymer compound.
[62]
The magnetic therapeutic (self-healing) is, even if the processing or generation of cracks (crack) in the coating layer (coat film) due to other factors, means the phenomenon that corrosion is inhibited by reaction of the compound within the coating layer. The Si and Ti compound wherein the composite resin coating layer in the present invention is excellent in magnetic therapeutic properties.
[63]
Further, it is preferable that the composite resin coating layer is formed to a thickness (thickness after drying) of 0.1 ~ 2.0㎛.
[64]
On the other hand, the composite resin-coated steel sheet for fuel tank of the present invention may include the steps of preparing a steel sheet; Forming a plating layer on at least one side of the steel sheet; And it can be produced from the step of forming the composite resin coating layer on top of the plating layer.
[65]
First, the steel sheet is preferably a previously mentioned high manganese cold rolled steel sheet, it is preferable to use an electroplating method or a melt-plating method in which as in the form a coating layer on at least one side.
[66]
Above the electroplating method, the molten plating is preferably carried out from one and applying a normal condition, an example Zn-Ni alloy electroplating is preferably performed under the following conditions: Zinc sulfate and nickel sulfate and containing a pH = 1, a current density of 120A / dm at a plating solution temperature of 60 ℃ condition 3 is passed through a pre-prepared steel sheet for 10 seconds to form a Zn-Ni alloy electroplating layer. As an auxiliary additive within the plating the plating solution may include phenyl sulfonic acid (Phenylsulfonic acid), a- ethylated naphthol (Ethylnaphtol) and ethylated naphthol sulfonic acid a- (Ethylnaphtolsulfonic acid) may be used.
[67]
To form a composite resin coating layer on the top coating layer formed according to the above are preferred. In this case, the composite resin coating layer may be formed using a composite resin composition according to the invention.
[68]
More specifically, the composite resin coating layer is preferably formed by curing and drying after the application of the composite resin composition described above on top of the coating layer, 120 to 200 temperature ℃.
[69]
As in applying the composite resin composition, may be treated with reactive or coating type, coating-type treatment is superior in corrosion-resistant double-side is preferred. The coating method, but can use a variety of coating methods such as roll coating method, a spray method, a dipping method, in the case of the present invention, it is most preferable to use the roll coating method. The roll coating method has an effect that can be single-sided and double-sided applied to both of the coated steel strip.
[70]
Further, the composite resin composition is in the range of 0.1 to 2.0g / m 2 is preferably applied in a single side coating weight of. If, on one side a coating weight 0.1g / m 2 is difficult to secure corrosion resistance, and fuel resistance of the target is less than. On the other hand, the single-sided adhesion amount 2.0g / m 2 when it becomes larger than the insulation is not so bad weldability preferred. In addition, there is a problem that becomes a too large thickness decrease the adhesion of the plated layer.
[71]
After completing the application of the composite resin composition, dried and cured at a particular temperature can be carried out in an oven with hot air or induction heating.
[72]
At this time, upon drying and curing temperature it is preferably carried out at 120 to 200 ℃ based on the temperature of the steel sheet (Metal Temperature, MT). If the drying and the curing temperature has a problem that curing reaction is difficult to failure to secure sufficient corrosion resistance and fuel resistance of less than 120 ℃ is between compositions within the component (organic and inorganic). On the other hand, if it exceeds 200 ℃ by cross-linking reaction of the curing agent is excessively increased, there is a problem that the coating layer becomes hard and workability is deteriorated.
[73]
In this way, it is possible to form a composite resin coating layer thickness of 0.1 to 2.0㎛ by complete drying and curing. It is difficult if the thickness of the composite resin coating layer is less than 0.1㎛ sufficient corrosion resistance and fuel resistance, such as securing of, on the other hand when it exceeds 2.0㎛ corrosion resistance and the fuel is improved but there is a problem that insulation is degraded weldability increases.
[74]
Composite resin coated steel sheet according to the present invention comprises a composite resin coating layer together with the coating layer in order is suitable as a material for use in a hybrid fuel tank is molded is required to the corrosion resistance and resistance as well as corrosion resistance is excellent, a complex shape by molding are excellent It would have the effect of the application.
Mode for the Invention
[75]
Hereinafter, a more detailed description of the present invention through the embodiments. However, this embodiment is not described to which the present invention is to be limited by this embodiment as described to illustrate the practice of the invention. The scope of the present invention is because it is determined by what is a reasonable inference from this information and set forth in the claims.
[76]
Example
[77]
Manufacturing a composite resin-coated steel sheet
[78]
[Inventive 1-33]
[79]
After the high to as one example of the elongation of the steel sheet and having an alloy composition as shown in Table 1 prepared manganese cold rolled steel sheet, in which the manganese electroplating (Zn, Zn-10% Ni), hot dip coating on a cold rolled steel surface (GI, Zn a plating layer by performing a plating of -1.6% Al-1.6% Mg, Zn-2.5% Al-3.0% Mg, Al-8.0% Si) and galvannealed (GA) was formed.
[80]
Then, after each of the composite resin composition shown in Table 2 above the coating layer by a roll (roll) coating, followed by drying and curing, the temperature of the steel plate so that 180 ℃. The weight of the dry film is cooled after the completion of the drying and curing of 0.1 to 2g / m 2 to prepare a composite resin-coated steel sheet. In this case, the polymeric resin as was used as the urethane polymer (number average molecular weight 25000, Tg 20 ℃), a melamine curing agent include trimethoxy methyl melamine, of corrosion additive in silica cake compound is lithium polysilicate, is isopropyl titanium compound profile was used for de-triethanol amino titanate, polyphosphazenes, and has a number average molecular weight of 20000 as a polymer, is also substituted with a functional group of the 3 (b) (R = R '= - CH 2 CH 2 OCH 2 CH 2 OCH 3 ) the compound was used with.

WE Claims

Polymeric resin 30 to 65% by weight; Curing agent 1 to 15% by weight; Corrosion additives 2-20% by weight; Polyphosphazenes (polyphosphazene) adhesion promoters comprising a polymer compound 1 to 15% by weight; And a fuel tank steel sheet composite resin composition containing the balance solvent.
[Claim 2]
The method of claim 1 wherein the polyphosphazene polymer compound has a number average molecular weight of 5000 ~ 50000, and alkyl, substituted alkyl, aryl and substituted fuel tank steel sheet composite resin composition having at least one functional group of the substituted aryl group.
[Claim 3]
The method of claim 1 wherein the polymer resin has a number average molecular weight of 5000 ~ 50000, and, Tg is 10 ~ 50 ℃ a urethane, acrylic, and epoxy ester copolymer at least one member selected fuel tank steel sheet composite resin composition of the polyurethane.
[Claim 4]
The method of claim 1, wherein the curing agent is a melamine-based curing agent, and aziridine curing agent at least one member of the isocyanate tank steel sheet composite resin composition.
[Claim 5]
The method of claim 4, wherein the melamine-based curing agents are melamine, butoxymethyl melamine, hexamethoxymethylmelamine and trimethoxysilane at least one member tank steel sheet composite resin composition of the methyl.
[Claim 6]
The method of claim 1 wherein the corrosion additive is a silicate compound and a mixture of the titanium compound, the silicate compound and the titanium compound is from 0.5: 1 to 4: that the fuel tank steel sheet a composite resin composition comprising a mixture ratio of 1.
[Claim 7]
The method of claim 6, wherein the silicate compound is lithium polysilicate, sodium polysilicate, potassium polysilicate and Colo represents at least one kind of colloidal silica, the titanium compound is titanium carbonate, isopropyl-di-triethanol amino titanate, La lactic acid titanium chelate and titanium acetylacetonate at least one member of the fuel tank steel sheet a composite resin composition.
[Claim 8]
Steel; The coating layer formed on at least one surface of the steel sheet; And the composite resin, comprises a composite resin coating layer formed on the plating layer coating layer containing 5 to 25% by weight and the polyphosphazene polymer compound polymer resin, 40 to 85% by weight, the curing agent 3 to 20% by weight, corrosion additives adhesion promoter comprises from 3 to 20% by weight, the steel sheet is a composite resin-coated steel sheet for a fuel tank having a tensile strength and elongation more than 35% or more of 800MPa.
[Claim 9]
The method of claim 8, wherein the polyphosphazene polymer compound has a number average molecular weight of 5000 and 50000 ~, alkyl, substituted alkyl, aryl and substituted composite resin-coated steel sheet for a fuel tank having at least one functional group of the substituted aryl group.
[Claim 10]
The method of claim 8, wherein the composite resin is a composite resin coating layer-coated steel sheet that will be formed to a thickness of 0.1 ~ 2.0㎛ fuel tank.
[Claim 11]
9. The method of claim 8 wherein the polymer resin has a number average molecular weight of 5000 ~ 50000, and, Tg is 10 ~ 50 ℃ a urethane, acrylic, and epoxy ester copolymer resin composite coated steel sheet for a fuel tank, at least one selected from urethane.
[Claim 12]
9. The method of claim 8 wherein the curing agent is a melamine-based curing agent, and aziridine curing agent at least one member of the isocyanate resin-coated steel sheet for fuel tank complex.
[Claim 13]
9. The method of claim 8 wherein the corrosion additive is a silicate compound and a titanium compound of 0.5: 1 to 4: 1 resin composite coated steel sheet for a fuel tank comprising a mixing ratio.
[Claim 14]
The method of claim 13 wherein the composite resin coating layer has the content ratio between the Si, Ti and P {([Si] + [Ti]) / [P]} is 0.5 to 1.5 in the resin-coated steel sheet for fuel tank complex.
[Claim 15]
The method of claim 13, wherein the silicate compound is lithium polysilicate, sodium polysilicate, potassium polysilicate and Colo represents at least one kind of colloidal silica, the titanium compound is titanium carbonate, isopropyl-di-triethanol amino titanate, La lactic acid titanium chelate and titanium acetylacetonate at least one member coated steel sheet for fuel tank of the composite resin.
[Claim 16]
The method of claim 8, wherein the steel is by weight%, carbon (C): 0.2 ~ 1.0%, manganese (Mn): 12 ~ 20%, employs aluminum (S-Al): 0.5 ~ 2.5%, the balance Fe and other and containing inevitable impurities manganese cold rolled steel sheet of the composite resin-coated steel sheet for a fuel tank.
[Claim 17]
The method of claim 8, wherein the coating layer is electro-plated layer or the molten plating layer, the electro-plated layer of zinc or zinc and nickel alloy plating, the molten plating is hot-dip galvanizing, alloying hot-dip galvanizing, zinc-aluminum-magnesium alloy and aluminum-silicon composite resin-coated steel sheet for a fuel tank, one of the alloy plating layer.
[Claim 18]
18. The method of claim 17 wherein the electroplating layer is 40g ~ 5 / m 2 is formed in a single side coating weight of the molten plating layer 60g ~ 20 / m 2 composite resin-coated steel sheet for a fuel tank which is formed in one side of the adhesion amount.
[Claim 19]
Preparing a steel sheet; Forming a plating layer on at least one side of the steel sheet; Applying a fuel tank steel sheet composite resin composition on top of the plating layer; And a step of the coated steel sheets of the fuel tank composite resin composition was dried at a temperature 120 ~ 200 ℃, the fuel tank steel sheet composite resin composition comprises a polymer resin 30 to 65% by weight; Curing agent 1 to 15% by weight; Corrosion additives 2-20% by weight; Polyphosphazenes (polyphosphazene) adhesion promoters comprising a polymer compound 1 to 15% by weight; The method of producing a resin-coated steel sheet for fuel tank complex and comprises a balance of solvent.
[Claim 20]
20. The method of claim 19 wherein the steel is by weight%, carbon (C): 0.2 ~ 1.0%, manganese (Mn): 12 ~ 20%, employs aluminum (S-Al): 0.5 ~ 2.5%, the balance Fe and other It includes unavoidable impurities the method for manufacturing a high manganese cold rolled steel sheet of the composite resin-coated steel sheet for a fuel tank having a tensile strength and elongation of 35% or more than 800MPa