Scratch-resistant highlight black finish paint for automotive trim and preparation method of coating

Abstract

The invention belongs to the field of coatings for automotive interiors, and relates to a scratch-resistant high-gloss black finish coating for automotive interiors and a preparation method of a coating layer of the scratch-resistant high-gloss black finish coating for automotive interiors, and the scratch-resistant high-gloss black finish coating comprises the following components in parts by weight: 30-40 parts of aliphatic acrylic polyurethane resin; 20 to 30 parts of alkyd resin; 5-10 parts of acrylic resin; 15 to 20 parts of butyl acetate; 10 to 15 parts of n-butyl alcohol; 1-2 parts of an ultraviolet absorbent; 0.5 to 1 part of an anti-aging agent; 0.1 to 0.5 part of a leveling agent; 0.3 to 1 part of a defoaming agent; 0.5 to 1 part of a scratch-resistant additive; and 0.2-1 part of a drier. Compared with the prior art, the coating prepared by the invention is sprayed on automotive upholstery, and the prepared polyurethane paint is high in climate adaptability, bright in paint film and good in scratch resistance; the preparation method of the paint is simple to operate, moderate in cost and easy for batch production.

Description

Technical Field

[0001] The present invention belongs to the field of automotive interior coatings, and in particular relates to a high-gloss black topcoat for automotive interiors with scratch resistance and a preparation method for the coating. Background Art

[0002] With the gradual improvement of living standards, people's demand for automobiles is increasing day by day. In order to cope with the increasing sales pressure of automobile brands, system manufacturers have put forward the spraying requirements of more, faster, better, and more cost-effective to coating enterprises. As an indispensable part of automotive interior parts, the conventional spraying method for acrylic polyurethane topcoat is a three-coat process, that is, a primer of 8-15um is applied first, followed by a decorative color paint; finally, a protective clear paint is sprayed. This spraying process can meet the requirements of the established test items of brand manufacturers.

[0003] However, in the face of the increasing pressure of sales, cost control, and carbon emissions in the automotive market, reducing the coating film, that is, adopting a two-coat process of primer and topcoat, has become an important development direction of the spraying process. Traditional high-gloss black topcoats have disadvantages such as poor scratch resistance and poor climate adaptability. Therefore, improving the high-gloss black topcoat and enhancing its performance to meet the requirements of the established test items of brand manufacturers has become an urgent new demand. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-gloss black topcoat for automotive interiors with scratch resistance and a preparation method for the coating, which solves the problems of poor scratch resistance, poor abrasion resistance, and low hardness of the two-coat high-gloss black topcoat by adding scratch-resistant additives, saving costs and meeting the requirements of the test items of brand manufacturers.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The first aspect of the present invention provides a high-gloss black topcoat for automotive interiors with scratch resistance, comprising the following components and their weight fraction contents:

[0007]

[0008]

[0009] In some specific embodiments, the scratch-resistant additive is perfluoropolyether alkylsiloxane, and preferably LP-323 type scratch-resistant additive is used.

[0010] In some specific embodiments, the aliphatic acrylic polyurethane resin is 68987-79-1 type aliphatic acrylic polyurethane resin, an acrylic polyurethane resin with dual-curing properties, which provides basic properties by cross-linking with the components in the curing agent.

[0011] In some specific embodiments, the alkyd resin is a soya bean alkyd resin, preferably the 3370DS type soya bean oil alkyd resin, which has the advantages of fast drying, good sanding property, low cost, etc.

[0012] In some specific embodiments, the acrylic resin is dipentaerythritol hexaacrylate, preferably the BM259 type dipentaerythritol hexaacrylate, and its glass transition temperature is above 80 °C.

[0013] In some specific embodiments, the ethyl acetate and n-butanol are used as solvents, which have the characteristic of fast drying and can improve the drying speed of the coating.

[0014] In some specific embodiments, the ultraviolet absorber is a hydroxybenzotriazole type ultraviolet absorber, preferably the Tinuvin 1130 type ultraviolet absorber;

[0015] The anti-aging agent is isooctyl 3,5-di-tert-butyl-4-hydroxybenzenepropionate, preferably the Irganox 1135 type isooctyl 3,5-di-tert-butyl-4-hydroxybenzenepropionate.

[0016] In some specific embodiments, the leveling agent is the LP-495 type leveling agent, a modified polyacrylate compound, which can effectively reduce the surface tension of the coating liquid and improve its leveling property.

[0017] In some specific embodiments, the defoaming agent is a silicone defoaming agent, which has the advantages of very low surface tension and good thermal stability; preferably the BYK-141 type silicone defoaming agent is used.

[0018] In some specific embodiments, the drier is a mixture of carboxylic acid metal salts, which can improve the drying rate of the coating film, and preferably the Troymax of Opal Chemical is used TM 2002.

[0019] The second aspect of the present invention provides a preparation method of a high-gloss black topcoat paint for automotive interior with scratch resistance, including: adding an aliphatic acrylic polyurethane resin, an alkyd resin, an acrylic resin, butyl acetate, n-butanol, an ultraviolet absorber, an anti-aging agent, a leveling agent, a defoaming agent, a scratch resistance additive, and a drier in sequence under a stirring speed of 500 - 800 rpm, and then shearing at a shear line speed of 12 - 15 m / s for 20 - 30 min until evenly dispersed to obtain.

[0020] The third aspect of the present invention provides a preparation method of a high-gloss black topcoat coating for automotive interior with scratch resistance, including: mixing the above-mentioned high-gloss black topcoat paint, a coating curing agent, and a high-solubility slow-drying thinner, spraying, standing, and baking to obtain the coating;

[0021] Among them, the high-dissolving-power slow-drying thinner comprises the following components and their weight contents: 10-20 parts of n-butanol, 35-45 parts of xylene, 20-30 parts of ethyl acetate, and 15-25 parts of 200# solvent naphtha.

[0022] In some specific embodiments, the mass ratio of the high-gloss black topcoat paint, the coating curing agent, and the high-dissolving-power slow-drying thinner is 5:1:2-4.

[0023] In some specific embodiments, the coating curing agent is HI-190 type curing agent.

[0024] In some specific embodiments, during the standing process, the standing time is 3-5 min.

[0025] In some specific embodiments, during the baking process, the baking temperature is 80-90 °C and the baking time is 8-12 hrs.

[0026] Compared with the prior art, the present invention has the following characteristics:

[0027] The present invention makes full use of the characteristics of raw materials. By only adding perfluoropolyether alkyl siloxane as a scratch-resistant additive, problems such as poor scratch resistance, low abrasion resistance, and low hardness of the high-gloss black topcoat can be solved, and a high-gloss black topcoat that can be used in the two-coat process is obtained, effectively saving processing time cost, labor cost, and economic cost.

[0028] The high-gloss black topcoat paint in the present invention is sprayed on automotive interior parts and has advantages such as strong climate adaptability and good film brightness;

[0029] The preparation method of the high-gloss black topcoat paint in the present invention is simple in operation, moderate in cost, and easy for batch production. Specific Embodiments

[0030] The present invention will be described in detail below with reference to specific embodiments. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0031] The following are more detailed implementation cases to further illustrate the technical solution of the present invention and the achievable technical effects through the following implementation cases.

[0032] In the following embodiments, unless otherwise specified for raw material reagents or treatment techniques, it means that they are all conventional commercially available products or conventional treatment techniques in the art.

[0033] Example 1:

[0034] A preparation method of a high-gloss black topcoat paint for scratch-resistant automotive interior parts specifically includes the following steps:

[0035] (1) Weigh each component according to Table 1:

[0036] Table 1

[0037]

[0038] (2) Prepare materials according to the weight fraction content of each component;

[0039] (3) Add the above components in sequence under the stirring speed of 600 rpm, including the solvents butyl acetate and n-butanol, aliphatic acrylic polyurethane resin, alkyd resin, acrylic resin, leveling agent, scratch resistance additive and other additives; After adding, perform shearing (shearing linear velocity 15 m / s) for 30 min until evenly dispersed to obtain this scratch-resistant high-gloss black topcoat paint.

[0040] A preparation method of a scratch-resistant high-gloss black topcoat coating for automobile interiors, comprising the following steps:

[0041] (1) Prepare materials according to the following components and weight fraction content: 15 parts of n-butanol, 40 parts of xylene, 25 parts of ethyl acetate, 20 parts of 200# solvent oil; and perform shearing (shearing linear velocity 10 m / s) for 10 min until evenly dispersed to obtain a high-dissolving power slow-drying thinner;

[0042] (2) Mix the above scratch-resistant high-gloss black topcoat paint, the curing agent HI-190 (solid content 90%) of BASF Chemical Co., Ltd. and the high-dissolving power slow-drying thinner in a mass ratio of 5:1:4 (theoretical spraying solid content 25.7%), spray 4 surfaces on the ABS / PC material sprayed with the SN8424 primer of Donglai Coating Technology (Shanghai) Co., Ltd., stand still at 20±5 °C for 5 min, and then bake in an 80 °C oven for 12 hrs.

[0043] The performance test results of this scratch-resistant high-gloss black topcoat are shown in the following table:

[0044] Table 2

[0045]

[0046]

[0047]

[0048] Example 2:

[0049] A preparation method of a scratch-resistant high-gloss black topcoat paint for automobile interiors, specifically comprising the following steps:

[0050] (1) Weigh each component according to Table 3:

[0051] Table 3

[0052]

[0053]

[0054] (2) Prepare materials according to the weight fraction content of each component;

[0055] (3) Add the above components in sequence under the mixer speed of 600 rpm, including the solvents butyl acetate and n-butanol, aliphatic acrylic polyurethane resin, alkyd resin, acrylic resin, leveling agent, scratch resistance additive and other additives; After adding, perform shearing (shearing linear velocity 15 m / s) for 30 min until evenly dispersed to obtain this scratch-resistant high-gloss black topcoat paint.

[0056] A preparation method for a scratch-resistant high-gloss black topcoat coating for automotive interiors, comprising the following steps:

[0057] (1) Prepare materials according to the following components and weight fraction content: 15 parts of n-butanol, 40 parts of xylene, 25 parts of ethyl acetate, 20 parts of 200# solvent oil; and perform shearing (shearing linear velocity 10 m / s) for 10 min until evenly dispersed to obtain a high-solubility slow-drying thinner;

[0058] (2) Mix the above-mentioned scratch-resistant high-gloss black topcoat paint, curing agent HI-190 (solid content 90%) of BASF Chemical Co., Ltd. and the high-solubility slow-drying thinner in a mass ratio of 5:1:4 (theoretical spraying solid content 25.7%), spray 4 surfaces on the ABS / PC material sprayed with SN8424 primer of Donglai Coating Technology (Shanghai) Co., Ltd., stand still at 20±5 °C for 5 min, and then bake in an 80 °C oven for 12 hrs.

[0059] The performance test results of this scratch-resistant high-gloss black topcoat are shown in the following table:

[0060] Table 4

[0061]

[0062]

[0063]

[0064] Control group

[0065] Compared with Example 1, the difference is only that: the scratch-resistant additive perfluoropolyether alkylsiloxane is not added, and the rest is the same as Example 1. In the scratch resistance test, some paint peeling or cracking occurred, and some scratches reached the primer; the abrasion resistance was only level 2, manifested as visible surface wear; its pencil scratch hardness was only HB level. That is, the scratch resistance, abrasion resistance and hardness of this comparative example are all inferior to those of Example 1. Thus, it can be seen that the addition of perfluoropolyether alkylsiloxane can solve the problems of poor scratch resistance, poor abrasion resistance and low hardness of the high-gloss black topcoat.

[0066] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A scratch-resistant high-gloss black topcoat for automobile interior, characterized in that: It includes the following components and contents by weight:

2. The scratch-resistant high-gloss black topcoat coating for automobile interior according to claim 1, characterized in that: The scratch-resistant additive is perfluoropolyether alkylsiloxane.

3. The scratch-resistant high-gloss black topcoat coating for automobile interior according to claim 1, characterized in that: The aliphatic acrylic polyurethane resin is a 68987-79-1 type aliphatic acrylic polyurethane resin.

4. The scratch-resistant high-gloss black topcoat coating for automobile interior according to claim 1, characterized in that: The alkyd resin is soybean oil alkyd resin.

5. The scratch-resistant high-gloss black topcoat paint for automobile interior according to claim 1, characterized in that: The acrylic resin is dipentaerythritol hexaacrylate.

6. The scratch-resistant high-gloss black topcoat paint for automobile interior according to claim 1, characterized in that: The ultraviolet absorber is a hydroxybenzotriazole ultraviolet absorber; and the anti-aging agent is 3,5-di-tert-butyl-4-hydroxyphenylpropionate isooctyl ester.

7. The scratch-resistant high-gloss black topcoat coating for automobile interior according to claim 1, characterized in that: The leveling agent is LP-495 leveling agent; the defoaming agent is an organosilicon defoaming agent; and the drying agent is a carboxylic acid metal salt mixture.

8. A method for preparing the scratch-resistant high-gloss black topcoat for automobile interiors as claimed in any one of claims 1 to 7, characterized in that: include: At a stirring speed of 500-800 rpm, aliphatic acrylic polyurethane resin, alkyd resin, acrylic resin, butyl acetate, n-butanol, UV absorber, anti-aging agent, leveling agent, defoamer, scratch-resistant additive, and drying agent are added in sequence and mixed, and then sheared at a shear line speed of 12-15 m / s for 20-30 min until uniform dispersion is obtained.

9. A method for preparing a scratch-resistant high-gloss black topcoat coating for automobile interior, characterized in that: include: The high gloss black topcoat coating according to any one of claims 1 to 7, a coating curing agent, and a high-solubility slow-drying diluent are mixed, sprayed, allowed to stand, and baked to obtain a coating; The high-solubility slow-drying diluent comprises the following components and contents in parts by weight: 10 to 20 parts of n-butanol, 35 to 45 parts of xylene, 20 to 30 parts of ethyl acetate, and 15 to 25 parts of 200# solvent oil.

10. The method for preparing the scratch-resistant high-gloss black topcoat coating for automobile interior according to claim 9, characterized in that: The mass ratio of the high-gloss black topcoat, the coating curing agent, and the high-solubility slow-drying diluent is 5:1:2-4; the coating curing agent is HI-190 curing agent; During the standing, the standing time is 3-5 minutes; during the baking, the baking temperature is 80-90° C., and the baking time is 8-12 hours.

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