KR20200055223A - A coating composition for carbon fiber reinforced plastic and manufacturing method of carbon fiber reinforced plastic using the same - Google Patents

Abstract

The present invention relates to a coating composition for carbon fiber reinforced plastic, comprising an acrylic resin and a hyper-branched polyester resin, and to a manufacturing method of carbon fiber reinforced plastic using the same. The manufacturing method of the carbon fiber reinforced plastic has smooth appearance quality and reliability by controlling the type and content of components constituting the coating composition.

Description

Coating composition for carbon fiber reinforced plastic and method for manufacturing carbon fiber reinforced plastic using the same {A COATING COMPOSITION FOR CARBON FIBER REINFORCED PLASTIC AND MANUFACTURING METHOD OF CARBON FIBER REINFORCED PLASTIC USING THE SAME}

The present invention relates to a coating composition for a carbon fiber reinforced plastic comprising an acrylic resin and a hyper-branched polyester resin, and a method for manufacturing a carbon fiber reinforced plastic using the same, wherein the type and content of the components constituting the coating composition are adjusted to be smooth. It is a feature to provide a method for manufacturing a carbon fiber reinforced plastic having secured appearance quality and reliability.

In the automobile industry, weight reduction is essential because it is related to fuel economy and fuel consumption is directly related to environmental problems. The most effective material in weight reduction is to replace metal with plastic material. In the case of plastic materials, the application range is increasing, including interior / exterior, and especially, at home and abroad, metals used in automobiles are applied to composite materials to reduce the weight while maintaining the rigidity of the metal.

In the automobile industry, the number of components that use carbon fiber reinforced plastics (CFRP) in place of metal is increasing. The application of CFRP material can secure mechanical properties that can replace metal, and can express various texture designs according to the weaving method of carbon fiber. However, the CFRP material was difficult to form a smooth appearance because the woven shape of the carbon fiber was reflected in the material and was vulnerable to ultraviolet rays, and thus there was a need to improve it.

Korean Registered Patent No. 10-1470803 relates to a novel manufacturing method that can mass-produce a uniform thermoplastic carbon fiber-reinforced composite material without an air pocket and having a constant thickness, and is introduced into a carbon fiber without introducing complicated processes. It improves the impregnation properties of, and provides a uniform thermoplastic carbon fiber-reinforced composite material of constant thickness without air pockets, but has high resistance to UV rays, excellent adhesion, water resistance, heat resistance and weatherability, and has a woven shape of carbon fiber. No method is provided to ensure a smooth appearance even when reflected in the material.

Korean Registered Patent No. 10-1470803

The present invention provides a coating composition capable of securing adhesion, water resistance, heat resistance, and weatherability with little influence from ultraviolet rays in manufacturing CFRP materials, and has a smooth appearance even when the weave shape of the carbon fiber is reflected in the material. It has an object to provide a method for applying the coating composition to enable.

The object of the present invention is not limited to the object mentioned above. The object of the present invention will be more apparent from the following description, and will be realized by means described in the claims and combinations thereof.

According to the present invention, the subject includes a curing agent, and the subject comprises 30% to 50% by weight of an acrylic resin, 30% to 40% by weight of a hyperbranched polyester resin, and 10% to 40% by weight of an additive. It provides a coating composition for carbon fiber reinforced plastic (CFRP) characterized by.

The acrylic resin has an acid value of 3 to 8 mg-KOH / g, a hydroxyl group content of 1% to 3%, a glass transition temperature of 60 ° C to 80 ° C, and a weight average molecular weight of 3,000 to 6,000.

The acrylic resin is methyl acrylate, ethyl acrylate, isopropyl acrylate, N-butyl acrylate, ethyl hexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, lauryl Methacrylate, acrylic acid, metaacrylic acid, maleic acid, itaconic acid, cronic acid, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxymethacrylate , 4-hydroxybutyl acrylate, styrene, vinyl toluene, acrylonitrile, vinyl acetate, acrylamide, N-methylol acrylamide, butyrol acrylamide, glycidyl methacrylate and combinations thereof It may be the selected one.

The acrylic resin may include an epoxy group.

The hyper-branched polyester resin has an acid value of 20 to 40 mg-KOH / g, a hydroxyl group content of 5% to 7%, a glass transition temperature of -30 ° C to 0 ° C, and a weight average molecular weight of 1,500 to 4,000.

The hyper-branched polyester resin is an aliphatic organic acid; And alcohol; may include.

The aliphatic organic acid is 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, phthalic acid, sebacic acid, azelaic acid, succinic acid, isodecylsuccinic acid, fumaric acid, maleic acid, adipic acid, gluta One selected from the group consisting of ric acid and combinations thereof, and the alcohol is ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,5-pentanediol, 1,6 -Hexanediol, 2-ethyl-1,3-hexanediol, 1,9-nonanediol, 1,10-decanediol, propylene glycol, trimethylol propane, 1,4-cyclohexanedimethanol, neopentyl glycol, 2 -Butyl-2-ethyl-1,3-propanediol, 1,2-diethyl-1,3-propanediol, and combinations thereof.

The hyper-branched polyester resin may include 5 to 10% by weight of an aliphatic polyacid having 10 to 20 carbon atoms.

The additive may be one selected from the group consisting of light stabilizers, catalysts, solvents, and combinations thereof.

The additive may include 1% to 2% by weight of the light stabilizer, 0.1% to 0.3% by weight of the catalyst, and 15% to 30% by weight of the solvent.

The light stabilizer may include one selected from the group consisting of hindered amine light stabilizers, ultraviolet absorbers, and combinations thereof.

The catalyst may include one selected from the group consisting of dibutyltin laurate, dibutyltin dilaurate, and combinations thereof.

The solvent may include one selected from the group consisting of glycol-based, ester-based, ketone-based, polyhydric alcohol-based, aromatic hydrocarbon-based, and combinations thereof.

The curing agent is a hexamethylene diisocyanate trimer system, the weight ratio of the main agent and the curing agent may be 2: 1 to 10: 1.

According to the present invention, preparing a carbon fiber; Preparing a subject comprising 30% to 50% by weight of an acrylic resin, 25% to 40% by weight of a hyperbranched polyester resin, and 10% to 40% by weight of an additive; Preparing a curing agent such that the subject and weight ratio are 2: 1 to 10: 1; Mixing the subject and a curing agent to prepare a coating composition; It provides a carbon fiber reinforced plastic (CFRP) manufacturing method comprising the step of spraying the coating composition to the prepared carbon fiber to form a coating film.

The forming of the coating film may include forming a primary coating film by spraying the coating composition on the prepared carbon fiber; And spraying the coating composition on the primary coating layer to form a secondary coating layer.

After the step of forming the primary coating layer or the step of forming the secondary coating layer, the method may further include drying at 60 ° C to 90 ° C for 10 minutes to 30 minutes.

The thickness of the primary coating layer or the secondary coating layer may be 35㎛ to 40㎛.

According to the present invention, it is possible to secure reliability such as adhesion, water resistance, heat resistance, weather resistance, etc. in accordance with automotive parts specifications.

According to the present invention, it is possible to provide a carbon fiber reinforced plastic having a smooth appearance quality.

According to the present invention, it is possible to secure a variety of glossy coating products through the gloss control of the clear.

The effects of the present invention are not limited to the effects mentioned above. It should be understood that the effects of the present invention include all effects that can be deduced from the following description.

Hereinafter, the present invention will be described in detail through examples. Embodiments of the present invention can be modified in various forms as long as the subject matter of the invention is not changed. However, the scope of the present invention is not limited to the following examples.

If it is determined that the subject matter of the present invention may be obscured, descriptions of well-known structures and functions will be omitted. "Including" in the present specification means that other components may be further included unless otherwise specified.

According to the present invention, the subject includes a curing agent, and the subject provides a coating composition for carbon fiber reinforced plastic (CFRP), characterized in that it comprises an acrylic resin, a hyper-branched polyester resin, and an additive.

The acrylic resin contains 30% to 50% by weight based on the main content. At this time, when the content is less than 30% by weight, the hardness falls sharply, and when it exceeds 50% by weight, the coating workability deteriorates and the image quality decreases and the appearance quality deteriorates. When the acrylic resin is used within a given content range, hardness is excellent, and in particular, appearance water resistance and heat resistance may be improved.

The acrylic resin has an acid value of 3 to 8 mg-KOH / g, a hydroxyl group content of 1% to 3%, a glass transition temperature of 60 ° C to 80 ° C, and a weight average molecular weight of 3,000 to 6,000.

The acrylic resin is methyl acrylate, ethyl acrylate, isopropyl acrylate, N-butyl acrylate, ethyl hexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, lauryl Methacrylate, acrylic acid, metaacrylic acid, maleic acid, itaconic acid, cronic acid, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxymethacrylate , 4-hydroxybutyl acrylate, styrene, vinyl toluene, acrylonitrile, vinyl acetate, acrylamide, N-methylol acrylamide, butyrol acrylamide, glycidyl methacrylate and combinations thereof It may be the selected one. Preferably, the acrylic resin contains an epoxy group. Since the acrylic resin includes an epoxy group, it has high fluidity compared to an acrylic resin having the same glass transition temperature, thereby improving smoothness and improving adhesion to difficult-to-adhesive materials.

The hyper-branched polyester resin can secure the smooth appearance by using the hyper-branched polyester resin as an auxiliary to the problem that it is difficult to secure a smooth appearance with only acrylic resin, and has a high hydroxyl content to increase the conversion rate of urethane reaction, resulting in high hardness even at high film thickness. It is possible to secure the physical properties of the island.

The hyper-branched polyester resin contains 30% to 40% by weight based on the main content. At this time, when the content is less than 30% by weight, the sharpness may drop rapidly, and when it exceeds 40% by weight, the hardness begins to decrease and water resistance and heat resistance may decrease. If the hyper-branched polyester resin is used within a given range, durability of the formed coating film, in particular, adhesion and clarity can be improved.

The hyper-branched polyester resin has an acid value of 20 to 40 mg-KOH / g, a hydroxyl group content of 5% to 7%, a glass transition temperature of -30 ° C to 0 ° C, and a weight average molecular weight of 1,500 to 4,000.

The hyper-branched polyester resin is an aliphatic organic acid; And alcohol; may include. At this time, the aliphatic organic acid is 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, phthalic acid, sebacic acid, azelaic acid, succinic acid, isodecylsuccinic acid, fumaric acid, maleic acid, adipic acid, writing One selected from the group consisting of lutaric acid and combinations thereof, and the alcohol is ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,5-pentanediol, 1, 6-hexanediol, 2-ethyl-1,3-hexanediol, 1,9-nonanediol, 1,10-decanediol, propylene glycol, trimethylol propane, 1,4-cyclohexanedimethanol, neopentyl glycol, 2-butyl-2-ethyl-1,3-propanediol, 1,2-diethyl-1,3-propanediol, and combinations thereof.

The hyper-branched polyester resin may include an aliphatic polyacid having 10 to 20 carbon atoms, wherein the content is 5% to 10% by weight. At this time, when the aliphatic polyhydric acid is applied in an amount of less than 5% by weight, polymerization stability may be deteriorated, and when it exceeds 10% by weight, reactivity may drop and the appearance of the final coating may deteriorate.

When the aliphatic polyhydric acid is applied and several chains are grown to form a hyper-branched polyester resin, a coating film having a higher hardness than a general linear polyester resin can be formed while maintaining clarity.

The additive may include one selected from the group consisting of light stabilizers, catalysts, solvents, and combinations thereof.

The light stabilizer may be included from 1% to 2% by weight based on the main content.

The light stabilizer may include one selected from the group consisting of hindered amine light stabilizers, ultraviolet absorbers, and combinations thereof. Specifically, the hindered amine light stabilizer is bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate.

The ultraviolet absorber is [3- [3- (2H-benzotriazole-2-yl) -5- (1,1-dimethyl ethyl) -4-hydroxy phenyl] -1-oxo propyl] -hydroxy poly ( Oxo-1,2-ethane diyl), 2- (2-hydroxy-4- [1-octyloxycarbonylethoxy] -4,6-bis (4-phenylphenyl) -1,3,5-tri Azine and combinations thereof.

The catalyst may be included 0.1% to 0.3% by weight based on the main content. At this time, if the content exceeds the given content range, pot life is shortened and there is a fear that workability may be deteriorated.

The catalyst may include one selected from the group consisting of dibutyltin laurate, dibutyltin dilaurate, and combinations thereof.

The solvent may be included from 15% to 30% by weight based on the main content. At this time, the solvent may have a different content depending on the thickness of the coating film to be formed and the method of forming the coating film, but it is sufficient in the above content range.

The solvent may include one selected from the group consisting of glycol-based, ester-based, ketone-based, polyhydric alcohol-based, aromatic hydrocarbon-based, and combinations thereof.

The curing agent is a hexamethylene diisocyanate trimer system.

In the present invention, the weight ratio of the main agent and the curing agent is suitably 2: 1 to 10: 1. It is preferably 2: 1 to 3: 1.

According to the present invention, preparing a carbon fiber; Preparing a subject comprising 30% to 50% by weight of an acrylic resin, 25% to 40% by weight of a hyperbranched polyester resin, and 10% to 40% by weight of an additive; Preparing a curing agent such that the subject and weight ratio are 2: 1 to 10: 1; Mixing the subject and a curing agent to prepare a coating composition; It is possible to provide a carbon fiber reinforced plastic (CFRP) manufacturing method comprising the step of forming a coating film by spraying the coating composition on the prepared carbon fiber.

In the method of manufacturing the carbon fiber reinforced plastic (CFRP), the following description of the characteristics, content, etc. of each component is omitted because it is as described above, it will be necessary to grasp this manufacturing method.

The step of preparing the carbon fiber is a step of preparing a fiber sheet of carbon material formed by weaving in one direction or in multiple directions. In this case, the fiber sheet of the carbon material may be continuously formed or discontinuously formed.

The step of preparing the subject is a step of preparing a subject comprising 30% to 50% by weight of an acrylic resin, 25% to 40% by weight of a hyperbranched polyester resin, and 10% to 40% by weight of an additive. The additive is a step of preparing a subject including a light stabilizer, a catalyst, and a solvent.

The solvent is a component for imparting the fluidity of the coating composition, and the coating composition is painted and then evaporated in the drying process to be removed from the coating film.

The step of preparing the curing agent is a step of preparing a curing agent for the purpose of curing the coating composition by mixing with the subject. As a curing agent, a hexamethylene diisocyanate trimer system is preferably used.

The step of preparing the coating composition is a step of mixing the prepared subject and a curing agent to form a coating composition. The weight ratio of the main agent and the curing agent is 2: 1 to 10: 1, preferably 2: 1 to 3: 1.

The forming of the coating film is a step of forming a coating film by coating the coating composition on the prepared carbon fiber, wherein the step of forming a primary coating film by spraying the coating composition on the prepared carbon fiber; And spraying a coating composition on the primary coating film to form a secondary coating film. At this time, a step of forming the primary coating layer and drying after each step of forming the secondary coating layer may be further added. At this time, the drying is preferably carried out at 60 ℃ to 90 ℃, 10 minutes to 30 minutes.

Hereinafter, the present invention will be described in more detail through specific examples. However, these examples are intended to illustrate the present invention and the scope of the present invention is not limited by them.

Example 1

The subject was prepared by weighing 30% by weight of acrylic resin, 40% by weight of hyperbranched polyester, 0.1% by weight of catalyst, 1.5% by weight of light stabilizer and 28.4% by weight of solvent. At this time, the acrylic resin has a weight average molecular weight of about 4,000, an acid value of 5 mg-KOH / g, a hydroxyl group content of about 2%, and the hyperbranched polyester has a weight average molecular weight of about 3,000, an acid value of 30 mg-KOH / g, a hydroxyl group content of 6%. . At this time, the hyperbranched polyester was applied with an aliphatic polyhydric acid having 20 carbon atoms in the middle of the chain, 10% by weight compared to the hyperbranched polyester resin. Butyl acetate was applied as the solvent, and Tinuvin479 and Tinuvin292 were mixed 1: 1 as the light stabilizer, and dibutyltin dilaurate was applied as the catalyst. After mixing the acrylic resin, hyper-branched polyester, catalyst and light stabilizer mixture with a curing agent in a ratio of 2: 1, the prepared solvent was added to prepare a coating composition. The prepared coating composition was sprayed onto a woven carbon fiber sheet to form a first coating film and dried at 80 ° C. for 30 minutes through an oven. The coating composition was sprayed again on the dried first coating film to form a second coating film and dried at 80 ° C. for 30 minutes through an oven. The thickness of the prepared coating film was about 80 μm.

Examples 2 to 3 and Comparative Examples 1 to 4

Example 2 to Example 3 and Comparative Examples 1 to 4 under the same conditions as in Table 1, CFRP coatings were prepared through the same process as in Example 1.

division Furtherance subject Hardener acryl
Suzy Hyper
Branch
polyester catalyst Light stabilizer solvent Comparative Example 1 30 45 0.1 1.5 23.4 50 Comparative Example 2 50 25 0.1 1.5 23.4 50 Comparative Example 3 25 40 0.1 1.5 33.4 50 Comparative Example 4 55 30 0.1 1.5 13.4 50 Example 1 30 40 0.1 1.5 28.4 50 Example 2 40 35 0.1 1.5 23.4 50 Example 3 50 30 0.1 1.5 18.4 50

Experimental Example

CFRP coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were measured as shown in Table 2 below.

division Seonyoung Sung Adhesion Pencil hardness Water resistance Heat resistance Weatherability Comparative Example 1 72 Good B Bad Good Good Comparative Example 2 56 Bad HB Good Good Bad Comparative Example 3 68 Good B Bad Bad Good Comparative Example 4 61 Bad HB Good Good Bad Example 1 72 Good HB Good Good Good Example 2 68 Good HB Good Good Good Example 3 65 Good HB Good Good Good Distinctness -BYK GARDNER's using Wave scan-DOI measurements (measurement're 10 ㎝) (comparing the overall rating of CF values of gloss, distinctness of image and orange peel)
Pencil hardness -evaluated according to ISO 15184 and JIS K 5600-5-4
Water resistance -Check the appearance change (discoloration, cracking, swelling, etc.) after leaving the specimen in a 40 ℃ chamber filled with water for 240 hours
Heat resistance -After leaving the test piece in a chamber with a test temperature of 90 ± 2 ° C for 300 hours, take it out and conduct an external evaluation and initial adhesion test
Weatherability -After 2500kJ / ㎡ irradiation according to SAE J1960, change of appearance

In the case of Comparative Example 1, it can be seen that as the proportion of the hyper-branched polyester resin increases, the hardness of the acrylic resin decreases while the proportion of the acrylic resin decreases, and the appearance (smoothness) decreases after evaluation of water resistance. In the case of the comparative example 2, it can be confirmed that the appearance of the hyperbranched polyester resin is lowered, and the appearance (sharpness) and adhesion after coating are lowered, and discoloration occurs in the weather resistance, thereby deteriorating the appearance. In Comparative Example 3, it can be seen that the acrylic resin ratio was lowered below the standard, so that a heat-resistant coating film was formed, and the pencil hardness was lowered and the water resistance and heat resistance after smoothness were lowered. In Comparative Example 4, as the proportion of the acrylic resin exceeded the standard, it was confirmed that the non-adhesiveness of image clarity was lowered and the weatherability was lowered. On the other hand, in the case of Examples 1 to 3, it can be confirmed that the results showed satisfactory results in terms of image clarity, adhesion, pencil hardness, water resistance, heat resistance, and weather resistance.

The experimental examples and examples of the present invention have been described in detail above, and the scope of the present invention is not limited to the experimental examples and examples described above, and the basic concept of the present invention defined in the following claims Various modifications and improvements of those skilled in the art are also included in the scope of the present invention.

Claims (18)

Contains the subject and curing agent,
The subject is a coating for carbon fiber reinforced plastic (CFRP), characterized in that it comprises 30% to 50% by weight of acrylic resin, 30% to 40% by weight of hyper branch polyester resin, and 10% to 40% by weight of additives. Composition.
According to claim 1,
The acrylic resin has an acid value of 3 to 8 mg-KOH / g, a hydroxyl group content of 1% to 3%, a glass transition temperature of 60 ° C to 80 ° C, and a weight average molecular weight of 3,000 to 6,000. ) Coating composition.
According to claim 1,
The acrylic resin is methyl acrylate, ethyl acrylate, isopropyl acrylate, N-butyl acrylate, ethyl hexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, lauryl Methacrylate, acrylic acid, metaacrylic acid, maleic acid, itaconic acid, cronic acid, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxymethacrylate , 4-hydroxybutyl acrylate, styrene, vinyl toluene, acrylonitrile, vinyl acetate, acrylamide, N-methylol acrylamide, butyrol acrylamide, glycidyl methacrylate and combinations thereof Carbon fiber reinforced plastic (CFRP) coating composition, characterized in that the selected one.
According to claim 1,
The acrylic resin coating composition for carbon fiber reinforced plastic (CFRP), characterized in that it comprises an epoxy group.
According to claim 1,
The hyper-branched polyester resin has an acid value of 20 to 40 mg-KOH / g, a hydroxyl group content of 5% to 7%, a glass transition temperature of -30 ° C to 0 ° C, and a weight average molecular weight of 1,500 to 4,000 carbon. Coating composition for fiber reinforced plastic (CFRP).
According to claim 1,
The hyper-branched polyester resin is an aliphatic organic acid; And
Alcohol; Coating composition for carbon fiber reinforced plastic (CFRP), characterized in that it comprises a.
The method of claim 6,
The aliphatic organic acid is 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, phthalic acid, sebacic acid, azelaic acid, succinic acid, isodecylsuccinic acid, fumaric acid, maleic acid, adipic acid, gluta One selected from the group consisting of ric acid and combinations thereof,
The alcohol is ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2-ethyl-1,3-hexane Diol, 1,9-nonanediol, 1,10-decanediol, propylene glycol, trimethylol propane, 1,4-cyclohexanedimethanol, neopentyl glycol, 2-butyl-2-ethyl-1,3-propanediol , 1,2-diethyl-1,3-propanediol and carbon fiber reinforced plastic (CFRP) coating composition, characterized in that one selected from the group consisting of.
According to claim 1,
The hyper-branched polyester resin is a coating composition for carbon fiber reinforced plastic (CFRP), characterized in that it contains an aliphatic polyacid having 10 to 20 carbon atoms in an amount of 5 to 10 wt% based on the hyperbranched polyester resin.
According to claim 1,
A coating composition for carbon fiber reinforced plastic (CFRP), characterized in that the additive is one selected from the group consisting of light stabilizers, catalysts, solvents, and combinations thereof.
According to claim 1,
A coating composition for carbon fiber reinforced plastic (CFRP), characterized in that it comprises 1% to 2% by weight of the light stabilizer, 0.1% to 0.3% by weight of the catalyst, and 15% to 30% by weight of the solvent as the additive.
The method of claim 10,
The light stabilizer is a coating composition for carbon fiber reinforced plastics (CFRP), characterized in that it comprises one selected from the group consisting of a hindered amine-based light stabilizer, a UV absorber, and combinations thereof.
The method of claim 10,
The catalyst is a coating composition for carbon fiber reinforced plastic (CFRP), characterized in that it comprises one selected from the group consisting of dibutyltin laurate, dibutyltin dilaurate, and combinations thereof.
The method of claim 10,
The solvent is a coating composition for carbon fiber reinforced plastic (CFRP), characterized in that it comprises one selected from the group consisting of glycol-based, ester-based, ketone-based, polyhydric alcohol-based, aromatic hydrocarbon-based, and combinations thereof.
According to claim 1,
The curing agent is a hexamethylene diisocyanate trimer system, the coating composition for carbon fiber reinforced plastic (CFRP), characterized in that the weight ratio of the main agent and the curing agent is 2: 1 to 10: 1.
Preparing carbon fibers;
Preparing a subject comprising 30% to 50% by weight of an acrylic resin, 25% to 40% by weight of a hyperbranched polyester resin, and 10% to 40% by weight of an additive;
Preparing a curing agent such that the subject and weight ratio are 2: 1 to 10: 1;
Mixing the subject and a curing agent to prepare a coating composition;
A method of manufacturing a carbon fiber reinforced plastic (CFRP), comprising coating the prepared carbon fiber with the coating composition to form a coating film.
The method of claim 15,
The forming of the coating film may include forming a primary coating film by spraying the coating composition on the prepared carbon fiber; And
A method of manufacturing a carbon fiber reinforced plastic (CFRP), comprising spraying the coating composition on the primary coating film to form a secondary coating film.
The method of claim 16,
After the step of forming the primary coating film or the step of forming the secondary coating film further comprising the step of drying for 60 minutes to 90 ℃, 10 minutes to 30 minutes, carbon fiber reinforced plastic (CFRP) manufacturing method.
The method of claim 16,
Carbon fiber reinforced plastic (CFRP) manufacturing method, characterized in that the thickness of the primary coating film or the secondary coating film is 35㎛ to 40㎛.