Varnish as well as preparation method and application thereof

Abstract

The invention belongs to the field of coatings, and particularly discloses varnish as well as a preparation method and application thereof, and the varnish comprises the following components in parts by mass: 30-40 parts of acrylic resin containing epoxy groups, 30-40 parts of acrylic resin containing carboxylic acid groups, 6-10 parts of anti-sagging resin, 0.5-1 part of a closed drier, 3-10 parts of an auxiliary agent and 11-33 parts of a solvent. According to the varnish, the acrylic resin containing epoxy groups and the acrylic resin containing carboxylic acid groups are adopted as main film forming substances, the epoxy groups are subjected to ring opening and polymerization reaction with carboxylic acid during film forming, a paint film does not shrink, the prepared paint film has good appearance and excellent fullness, and meanwhile, due to a special crosslinking system of the paint, the paint film is not prone to falling off, so that the paint film is not prone to falling off. And the paint film has excellent wear resistance and chemical resistance.

Description

Technical Field

[0001] The invention belongs to the field of coatings, and in particular relates to a varnish and a preparation method and application thereof. Background Art

[0002] As the top coating of automobile paint, automobile clearcoat not only provides the first line of protection for the car body, but also has a decorative effect. The protective effect requires the clearcoat to have excellent weather resistance, wear resistance, chemical resistance and other protective properties. As a high-end consumer product, users have very high requirements for the appearance quality of automobiles. High gloss, high fullness and high definition of impact (DOI) are also important conditions for purchasing a car.

[0003] The mainstream varnishes on the market are all single-component acrylic-amino baking varnishes, and their reaction mechanism is condensation substitution reaction. During the baking reaction, the paint film will shrink slightly, resulting in a decrease in the fullness of the paint film, which in turn affects the appearance. The reaction mechanism of acrylic-amino baking varnish is as follows (in the following formula, R1 and R2 are alkyl groups).

[0004] Summary of the invention

[0005] In order to overcome at least one technical problem existing in the above-mentioned prior art, one of the objectives of the present invention is to provide a varnish.

[0006] A second object of the present invention is to provide a method for preparing a varnish.

[0007] A third object of the present invention is to provide a vehicle.

[0008] A fourth object of the present invention is to provide the use of the above-mentioned varnish in external coating of industrial products.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] The first aspect of the present invention provides a varnish, comprising the following components in parts by weight: 30 to 40 parts of an acrylic resin containing an epoxy group, 30 to 40 parts of an acrylic resin containing a carboxylic acid group, 6 to 10 parts of an anti-sagging resin, 0.5 to 1 part of a blocked drying agent, 3 to 10 parts of an auxiliary agent, and 11 to 33 parts of a solvent;

[0011] The anti-sagging resin comprises the following raw materials in parts by weight: 80 to 90 parts of acrylic resin containing epoxy groups, 3 to 8 parts of organic amines, and 3 to 8 parts of hexamethylene diisocyanate.

[0012] The present invention adopts an acrylic resin containing epoxy groups and an acrylic resin containing carboxylic acid groups to form a new cross-linked resin system, that is, a single-component epoxy-carboxylic acid baking varnish. When forming a coating, the epoxy groups in the acrylic resin containing epoxy groups and the carboxylic acid groups in the acrylic resin containing carboxylic acid groups are cross-linked to form a film under the action of a blocked drying agent. The mechanism is the ring-opening polymerization of the epoxy groups. The paint film does not shrink and has a high fullness. The appearance is significantly better than the mainstream acrylic-amino baking varnish on the market, and it also has excellent wear resistance, acid and alkali resistance, and anti-sagging performance. The reaction mechanism of epoxy-carboxylic acid baking varnish is as follows (in the following formula, R1 and R2 are alkyl groups).

[0013]

[0014] Preferably, the epoxy group-containing acrylic resin comprises the following polymerized monomers in parts by mass: 5-10 parts of styrene, 5-10 parts of methyl methacrylate, 5-10 parts of acrylic acid, 10-20 parts of hydroxyethyl acrylate, 15-25 parts of isopentyl acrylate, and 15-25 parts of epoxy group-containing acrylic monomer.

[0015] Preferably, the epoxy group-containing acrylic resin is prepared by a preparation method comprising the following steps:

[0016] (1) Under an inert atmosphere, heat xylene to 100-120°C;

[0017] (2) mixing styrene, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, isopentyl acrylate and an acrylic acid monomer containing an epoxy group to obtain a monomer mixture;

[0018] (3) adding the monomer mixture and the initiator dropwise into the solvent of step (1) and reacting for 2-3 hours;

[0019] (4) After the reaction is completed, diluting with propylene glycol methyl ether acetate to obtain the epoxy group-containing acrylic resin.

[0020] Preferably, the epoxy group-containing acrylic monomer includes at least one of glycidyl acrylate, glycidyl isooctanoate, and glycidyl methyl neodecanoate.

[0021] Preferably, the carboxylic acid group-containing acrylic resin comprises the following polymerized monomers in parts by mass: 5-10 parts of styrene, 5-10 parts of methyl acrylate, 5-10 parts of isoheptyl acrylate, 10-20 parts of hydroxypentyl acrylate, 15-25 parts of isopentyl acrylate, and 15-25 parts of carboxyl group-containing acrylic monomer.

[0022] Preferably, the acrylic resin containing carboxylic acid groups is prepared by a preparation method comprising the following steps:

[0023] (1) Under an inert atmosphere, heat the solvent xylene and aromatic solvent oil S-100 to 120-160°C;

[0024] (2) mixing styrene, methyl acrylate, isoheptyl acrylate, hydroxypentyl acrylate, isopentyl acrylate, and acrylic acid monomers containing a carboxyl group to obtain a monomer mixture;

[0025] (3) adding the monomer mixture and the initiator dropwise into the mixed solvent in step (1) and reacting for 2-3 hours;

[0026] (4) After the reaction is completed, diluting with propylene glycol methyl ether acetate to obtain the acrylic resin containing carboxylic acid groups.

[0027] Preferably, the carboxyl group-containing acrylic acid monomer includes at least one of methacrylic acid, cyclohexyl acrylic acid and itaconic acid.

[0028] Preferably, the initiator is a peroxide or an azo compound; further preferably, the initiator includes at least one of dibenzoyl peroxide, tert-butyl perbenzoate, and azobisisobutylcyanide.

[0029] Preferably, the epoxy group-containing acrylic resin has a viscosity of 20,000-30,000 mPa.s measured at 25°C.

[0030] Preferably, the solid content of the epoxy group-containing acrylic resin is 55-65%.

[0031] Preferably, the viscosity of the acrylic resin containing carboxylic acid groups measured at 25° C. is 25000-35000 mPa.s.

[0032] Preferably, the solid content of the acrylic resin containing carboxylic acid groups is 50-60%.

[0033] Preferably, the blocked drying agent is prepared by a preparation method comprising the following steps:

[0034] The epoxy group-containing acrylic resin is frozen and cooled to -5°C to -10°C, and then mixed with n-butanol; then an organic amine and hexamethylene diisocyanate are added to react for 30-60 minutes to obtain an anti-sagging resin. The anti-sagging resin obtained by this method is a milky white paste-like liquid.

[0035] Preferably, the blocked drier comprises an organic phosphoric acid drier. The blocked organic phosphoric acid drier generates a moderately strong acid when deblocked at high temperature, which can improve the reactivity of acrylic resin containing epoxy groups and acrylic resin containing carboxylic acid groups.

[0036] Preferably, the blocked drying agent includes at least one of triphenyl phosphate and trihexylbenzene phosphate. Generally, the epoxy-carboxylic acid reaction requires a relatively high temperature, which will only be carried out above 180°C. This is difficult to adapt to the automotive varnish construction process (baking at 140°C). The specific blocked drying agent selected by the present invention can, on the one hand, improve the reactivity of acrylic resin containing epoxy groups and acrylic resin containing carboxylic acid groups, so that the two can react at around 140°C, adapt to the existing automotive varnish construction process, and the construction process is stable. On the other hand, the organic group in the blocked drying agent can enhance its compatibility with the system, and the use of the blocked drying agent in the present invention can avoid the reaction of the coating in the packaging barrel and maintain the storage stability of the system.

[0037] Preferably, the auxiliary agent includes at least one of a leveling agent, a defoaming agent, and an anti-aging agent; further preferably, the auxiliary agent includes a leveling agent, a defoaming agent, and an anti-aging agent; more preferably, the auxiliary agent includes the following components in parts by mass: 1 to 3 parts of a leveling agent, 0.1 to 0.5 parts of a defoaming agent, and 2 to 4 parts of an anti-aging agent.

[0038] Preferably, the defoamer is an organosilicon defoamer; further preferably, the defoamer is selected from at least one of BYK-052, BYK-066N, and BYK-077. The products with product models BYK-052, BYK-066N, and BYK-077 are all purchased from BYK Chemical Company.

[0039] Preferably, the leveling agent is an acrylic leveling agent; more preferably, the leveling agent is selected from at least one of BYK-358N, BYK-371, and Efka FL3772. The products with product models BYK-358N, BYK-371, and Efka FL3772 are all purchased from BYK Chemical Company.

[0040] Preferably, the anti-aging agent is selected from at least one of Ciba 123 and Ciba 1130. Products with product models Ciba 123 and Ciba 1130 are purchased from BASF.

[0041] Preferably, the organic amine includes at least one of n-hexylamine, p-methylbenzylamine and p-methylbenzamide.

[0042] Preferably, the solvent includes at least one of n-butanol, xylene, and aromatic solvent oil S-100; further preferably, the solvent includes n-butanol, xylene, and aromatic solvent oil S-100; more preferably, the solvent includes the following components in parts by mass: 2 to 8 parts of n-butanol, 5 to 15 parts of xylene, and 4 to 10 parts of aromatic solvent oil S-100.

[0043] Preferably, the varnish comprises the following components in parts by mass: 30 to 40 parts of an acrylic resin containing an epoxy group, 30 to 40 parts of an acrylic resin containing a carboxylic acid group, 6 to 10 parts of an anti-sagging resin, 0.5 to 1 part of a blocked drying agent, 1 to 3 parts of a leveling agent, 0.1 to 0.5 parts of a defoaming agent, 2 to 4 parts of an anti-aging agent, 2 to 8 parts of n-butanol, 5 to 15 parts of xylene, and 4 to 10 parts of aromatic solvent oil S-100.

[0044] Preferably, the varnish has a viscosity of 60 to 90 s (coating-4 cups) measured at 25°C.

[0045] The second aspect of the present invention provides a method for preparing the varnish described in the first aspect of the present invention, comprising the following steps: mixing raw materials including an acrylic resin containing an epoxy group, an acrylic resin containing a carboxylic acid group, an anti-sagging resin, a blocked drying agent, an auxiliary agent, and a solvent to obtain the varnish.

[0046] A third aspect of the present invention provides an automobile comprising a coating obtained using the clearcoat according to the first aspect of the present invention.

[0047] The fourth aspect of the present invention provides use of the varnish according to the first aspect of the present invention in external painting of industrial products.

[0048] The beneficial effects of the present invention are as follows: the varnish of the present invention uses an acrylic resin containing epoxy groups and an acrylic resin containing carboxylic acid groups as main film-forming substances, and during film formation, the epoxy groups open the ring and react with the carboxylic acid to form a polymerization reaction, and the paint film does not shrink. The prepared paint film has a good appearance and excellent fullness. At the same time, due to its special cross-linking system, the paint film has excellent wear resistance and chemical resistance. In addition, the anti-sagging resin of the present invention has good compatibility with the acrylic resin containing epoxy groups and the acrylic resin containing carboxylic acid groups, so that the varnish has excellent anti-sagging performance. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention is further described in detail below in conjunction with examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that if there are processes that are not particularly described in detail below, they can be implemented or understood by those skilled in the art with reference to the prior art. The reagents or instruments used that do not indicate the manufacturer are all conventional products that can be purchased commercially.

[0050] Example 1

[0051] This example provides an automobile varnish, which is composed of the following components in parts by mass: 35 parts of an acrylic resin containing an epoxy group, 35 parts of an acrylic resin containing a carboxyl group, 8 parts of an anti-sagging resin, 2 parts of n-butanol, 4 parts of S-100 solvent (aromatic solvent oil S-100, Maoming Petrochemical Co., Ltd.), 0.2 parts of BYK-052 defoamer (BYK Chemical, silicone polymer), 0.8 parts of a closed drying agent (i.e., triphenyl phosphate, King's Chemical), 2 parts of BYK-358N leveling agent (BYK Chemical, acrylic polymer), 3 parts of Ciba 123 anti-aging agent (BASF Materials Co., Ltd., hindered amine), and 10 parts of solvent xylene (Maoming Petrochemical Co., Ltd.). The formula is shown in Table 1 below.

[0052] The automotive clearcoat in this example was prepared by the following preparation method:

[0053] Under stirring, acrylic resin containing epoxy groups, acrylic resin containing carboxylic acid groups, anti-sagging resin, n-butanol, S-100 solvent, defoamer, sealing drier, leveling agent, anti-aging agent and xylene are added to the container in sequence. After the addition is completed, stirring is continued for 30 minutes. The viscosity is 90s (Tu-4 cup, 25°C). Filter with a 5-micron filter bag to obtain the automotive varnish in this example.

[0054] The epoxy group-containing acrylic resin in this example is prepared by the following preparation method:

[0055] (1) Add 12 parts by mass of xylene solvent into a reactor, heat to 110° C. and introduce nitrogen;

[0056] (2) 8 parts by mass of styrene, 10 parts by mass of methyl methacrylate, 10 parts by mass of acrylic acid, 20 parts by mass of hydroxyethyl acrylate, 20 parts by mass of isoamyl acrylate and 20 parts by mass of an acrylic monomer containing an epoxy group are premixed to obtain a monomer mixture, wherein the acrylic monomer containing an epoxy group is glycidyl acrylate;

[0057] (3) The monomer mixture and 1 part by weight of the initiator are simultaneously added dropwise into the reactor, and the reaction is continued for 2.5 hours after the addition is completed. The initiator is dibenzoyl peroxide;

[0058] (4) After the reaction is completed, the resin is diluted with propylene glycol methyl ether acetate to a solid content of 60% and a viscosity of 21000 mPa.s to obtain an acrylic resin containing epoxy groups.

[0059] The acrylic resin containing carboxylic acid groups in this example is prepared by the following preparation method:

[0060] (1) Add 8 parts by mass of xylene solvent and 8 parts by mass of S100 solvent into a reactor, heat to 140° C. and introduce nitrogen;

[0061] (2) Premix 10 parts by mass of styrene, 10 parts by mass of methyl acrylate, 10 parts by mass of isoheptyl acrylate, 15 parts by mass of hydroxypentyl acrylate, 20 parts by mass of isopentyl acrylate and 20 parts by mass of an acrylic acid monomer containing a carboxyl group to obtain a monomer mixture, wherein the acrylic acid monomer containing a carboxyl group is methylcyclohexyl acrylic acid;

[0062] (3) The monomer mixture and 1 part by weight of the initiator are simultaneously added dropwise into the reactor, and the reaction is continued for 2.5 hours after the addition is completed. The initiator is dibenzoyl peroxide;

[0063] (4) After the reaction is completed, the resin is diluted with propylene glycol methyl ether acetate to a solid content of 55% and a viscosity of 28000 mPa.s to obtain an acrylic resin containing a carboxylic acid group.

[0064] The anti-sagging resin in this example is prepared by the following preparation method:

[0065] (1) adding 80 parts by weight of an epoxy group-containing acrylic resin as a carrier into a reactor and freezing the reactor to -8°C;

[0066] (2) Start stirring at a speed of 400 r / min and add 10 parts by mass of n-butanol;

[0067] (3) 5 parts by weight of an organic amine and 5 parts by weight of hexamethylene diisocyanate are added simultaneously and reacted for 45 minutes until a uniform milky white paste-like liquid is formed to obtain an anti-sagging resin; wherein the organic amine is p-methylbenzylamine.

[0068] Embodiment 2-3

[0069] The formula of the automobile clear coat in Examples 2 to 3 is shown in Table 1 below, and is prepared by referring to the preparation method in Example 1.

[0070] Table 1 Formula of automotive varnish in Examples 1 to 3

[0071]

[0072]

[0073] Comparative Example 1

[0074] The formula of the automobile varnish in this example is shown in Table 2 below. The difference between this example and Example 1 is that this example does not contain anti-sagging resin.

[0075] The automobile varnish in this example can be prepared by referring to the preparation method in Example 1.

[0076] Comparative Example 2

[0077] The formula of the automobile clear coat in this example is shown in Table 2 below. The difference between this example and Example 1 is that this example does not contain a blocked drying agent.

[0078] The automobile varnish in this example can be prepared by referring to the preparation method in Example 1.

[0079] Comparative Example 3

[0080] The formula of the automobile varnish in this example is shown in Table 2 below. The difference between this example and Example 1 is that the amount of the blocked catalyst in this example is 0.1 parts by mass.

[0081] The automobile varnish in this example can be prepared by referring to the preparation method in Example 1.

[0082] Comparative Example 4

[0083] The formula of the automobile varnish in this example is shown in Table 2 below. The difference between this example and Example 1 is that the amount of the blocked catalyst in this example is 1.2 parts by mass.

[0084] The automobile varnish in this example can be prepared by referring to the preparation method in Example 1.

[0085] Comparative Example 5

[0086] The formula of the automobile varnish in this example is shown in Table 2 below. The difference between this example and Example 1 is that the anti-sagging resin in Example 1 is replaced by a commercially available anti-sagging resin in this example.

[0087] The automobile varnish in this example can be prepared by referring to the preparation method in Example 1.

[0088] Table 2 Formula of automotive varnish in Comparative Examples 1 to 5

[0089]

[0090] Comparative Example 6

[0091] The automotive varnish in this example is a commercially available acrylic-amino varnish, and the formula is shown in Table 3.

[0092] Table 3 Formula of automobile clear coat in comparative example 6

[0093]

[0094]

[0095] Performance Test:

[0096] First, the viscosity of the automotive varnish in Examples 1 to 3 and Comparative Examples 1 to 6 was adjusted to 25-35s (coating -4 cups) using a diluent, and then sprayed on a cold-rolled plate (polished with 200-mesh sandpaper) to form a coating, and then the various properties of the coating were tested in accordance with the current standards. The test method is shown in Table 4, and the specific test results are shown in Table 5 below.

[0097] Table 4 Performance test standards are as follows

[0098]

[0099] Table 5 Test results of various properties of automobile clear coats in Examples 1 to 3 and Comparative Examples 1 to 6

[0100]

[0101]

[0102] It should be noted that the appearance of automotive clearcoat is comprehensively evaluated by multiple indicators, including gloss, long wave / short wave and DOI (image clarity). Generally speaking, the higher the gloss, the brighter the paint film and the better the appearance; long wave and short wave are the characteristics of orange peel on the paint film surface. The lower the value (especially short wave), the smoother the paint film and the better the appearance; DOI is the characteristic of the clarity of the paint film surface. The higher the value, the better the appearance. The three parameters are interrelated and inconsistent. An excellent automotive clearcoat appearance must have all three parameters.

[0103] As can be seen from Table 5, Examples 1 to 3 have excellent appearance performance, gloss>93, long wave<10, short wave<17, DOT>91. Comparative Example 1 did not add anti-sagging resin, and the anti-sagging performance dropped from 75 microns to 25 microns, which could not meet the use requirements. Comparative Example 5 used commercially available anti-sagging resin. Although the anti-sagging performance could reach 70 microns, its appearance was significantly reduced, the gloss dropped to 87, the short wave increased to 22.3, and the DOI dropped to 84. This shows that the commercially available anti-sagging resin is incompatible with the epoxy-carboxylic acid system resin in the present invention, resulting in a decline in appearance. The anti-sagging resin synthesized in the present invention has good compatibility with the epoxy-carboxylic acid system and can maintain an excellent appearance effect.

[0104] The blocked catalysts used in Comparative Examples 2 and 3 were 0 parts by mass and 0.2 parts by mass, respectively, which were less than those in Examples 1 to 3. Although the appearance of the prepared varnishes was similar to that of Examples 1 to 3, the hardness and chemical resistance of the paint film were significantly reduced. This was mainly due to the insufficient amount of blocked catalyst, which resulted in an incomplete reaction of the paint film, and thus a low crosslinking density of the paint film and reduced blocking performance. In Comparative Example 4, the amount of blocked catalyst was 1.2 parts, and the appearance of the prepared varnish was comparable to that of Examples 1 to 3, but the excessive amount of blocked catalyst affected the thermal storage stability and caused precipitation.

[0105] Comparative Example 6 is a commercially available acrylic-amino automobile varnish. Although the gloss can reach 91, the short wave is relatively large (21.7), and the DOI is only 87. The appearance is obviously inferior to the varnishes in Examples 1 to 3 of the present invention. The reason is that the cross-linking reaction mechanism in Comparative Example 6 is the ester exchange reaction between the hydroxyl group in the acrylic resin and the amino resin. Due to the dealcoholization during the process, the paint film will shrink slightly, resulting in an increase in short wave and a decrease in DOI. The cross-linking reaction mechanism in Examples 1 to 3 is the ring-opening reaction of the epoxy group and the carboxylic acid group, and there is no paint film shrinkage, so the paint film can maintain an excellent appearance. In addition, the acid resistance of the varnish in Comparative Example 6 is significantly lower than that in Examples 1 to 3, which is also related to its different cross-linking method.

[0106] In summary, the automobile varnish of the present invention adopts a new cross-linking reaction system, that is, a single-component epoxy-carboxylic acid baking varnish. By introducing homemade acrylic resin containing epoxy groups, acrylic resin containing carboxyl groups and anti-sagging resin, the obtained automobile varnish has excellent appearance, gloss>93, long wave<10, short wave<17, DOI>91, and has excellent acid and alkali resistance, solvent resistance and high storage stability. The comprehensive performance is significantly better than the mainstream acrylic-amino automobile varnish on the market.

[0107] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A varnish, characterized in that: The invention comprises the following components in parts by weight: 30 to 40 parts of acrylic resin containing epoxy groups, 30 to 40 parts of acrylic resin containing carboxylic acid groups, 6 to 10 parts of anti-sagging resin, 0.5 to 1 part of blocked drying agent, 3 to 10 parts of auxiliary agent, and 11 to 33 parts of solvent; The anti-sagging resin comprises the following raw materials in parts by weight: 80 to 90 parts of acrylic resin containing epoxy groups, 3 to 8 parts of organic amines, and 3 to 8 parts of hexamethylene diisocyanate.

2. The varnish according to claim 1, characterized in that: The epoxy group-containing acrylic resin comprises the following polymerized monomers in parts by weight: 5 to 10 parts of styrene, 5 to 10 parts of methyl methacrylate, 5 to 10 parts of acrylic acid, 10 to 20 parts of hydroxyethyl acrylate, 15 to 25 parts of isopentyl acrylate, and 15 to 25 parts of epoxy group-containing acrylic monomer.

3. The varnish according to claim 2, characterized in that: The epoxy group-containing acrylic monomer includes at least one of glycidyl acrylate, glycidyl isooctanoate, and glycidyl methyl neodecanoate.

4. The varnish according to claim 1, characterized in that: The carboxylic acid group-containing acrylic resin comprises the following polymerized monomers in parts by mass: 5 to 10 parts of styrene, 5 to 10 parts of methyl acrylate, 5 to 10 parts of isoheptyl acrylate, 10 to 20 parts of hydroxypentyl acrylate, 15 to 25 parts of isopentyl acrylate, and 15 to 25 parts of carboxyl group-containing acrylic monomer.

5. The varnish according to claim 4, characterized in that: The carboxyl group-containing acrylic acid monomer includes at least one of methacrylic acid, cyclohexyl acrylic acid, and itaconic acid.

6. The varnish according to claim 1, characterized in that: The viscosity of the epoxy group-containing acrylic resin measured at 25° C. is 20000-30000 mPa.s; And / or, the solid content of the epoxy group-containing acrylic resin is 55-65%; and / or, the viscosity of the acrylic resin containing carboxylic acid groups measured at 25° C. is 25000-35000 mPa.s; And / or, the solid content of the acrylic resin containing carboxylic acid groups is 50-60%.

7. The varnish according to claim 1, characterized in that: The blocked drying agent includes at least one of triphenyl phosphate and trihexylbenzyl phosphate; And / or, the auxiliary agent includes at least one of a leveling agent, a defoaming agent, and an anti-aging agent; And / or, the organic amine includes at least one of n-hexylamine, p-methylbenzylamine and p-methylbenzamide; And / or, the solvent includes at least one of n-butanol, xylene, and aromatic solvent oil S-100.

8. The method for preparing the varnish according to any one of claims 1 to 7, characterized in that: The following steps are involved: The invention is prepared by mixing raw materials including acrylic resin containing epoxy group, acrylic resin containing carboxylic acid group, anti-sagging resin, blocked drying agent, auxiliary agent and solvent.

9. A car, characterized in that: A coating layer comprising the varnish according to any one of claims 1 to 7.

10. Use of the varnish according to any one of claims 1 to 7 in external coating of industrial products.

Images