Easy-to-clean self-repairing car coating material and preparation method and coating method thereof

Abstract

This invention provides an easy-to-clean self-healing car cover coating material and its preparation and application methods. The raw material formulation of the easy-to-clean self-healing car cover coating material, by weight, includes: 30-45 parts of a first resin; 10-25 parts of a second resin, wherein the second resin is a branched acrylic resin with an average particle size not exceeding 20 nm; 2-8 parts of a third resin, wherein the third resin is a linear acrylic resin; 0.1-1 parts of a catalyst; 0.1-1 parts of a polydimethylsiloxane leveling agent; 0.5-3 parts of a UV absorber; 30-50 parts of butyl acetate; 50-80 parts of ethyl acetate; and 30-50 parts of a curing agent, wherein the curing agent includes polyisophorone diisocyanate and polyhexamethylene diisocyanate. This invention provides an easy-to-clean self-healing car cover coating material and its preparation and application methods, enabling the car cover coating material to possess self-healing properties while also exhibiting advantages such as easy cleaning, chemical resistance, and excellent tensile properties.

Description

Technical Field

[0001] This invention belongs to the field of car cover coating, specifically relating to an easy-to-clean, self-healing car cover coating material and its preparation and application methods. Background Technology

[0002] The current automotive wrap market demands coatings that possess self-healing capabilities while also being easy to clean, chemically resistant, and exhibiting excellent tensile strength. However, current technology cannot simultaneously meet all these requirements. Some technologies achieve self-healing by adding microcapsules, but these technologies generally lack the ability to repair multiple times; once the same area has been repaired, the microcapsules are no longer present, thus losing the self-healing function. Other technologies achieve repair through intermolecular interactions, but this method is subject to decay; with increasing scratches, the intermolecular forces weaken, reducing the self-healing effect. Still other technologies achieve easy cleaning by reducing surface energy, but graffiti such as markers can still penetrate the coating and cause contamination. Furthermore, there are objective limitations. Due to limitations in automotive wrap production lines, the coating can only be cured at 110°C for 3 minutes, resulting in poor curing and insufficient cross-linking density, thus affecting subsequent chemical resistance and ease of cleaning. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an easy-to-clean self-healing car cover coating material and its preparation and coating methods, so that the car cover coating material has self-healing properties, and at the same time has the advantages of easy cleaning, chemical resistance and excellent tensile properties.

[0004] To solve the above-mentioned technical problems, the present invention provides an easy-to-clean self-healing car cover coating material, the raw material formula of which, by weight, includes: 30-45 parts of a first resin, and the structural formula of the first resin is as follows: 10-25 parts of a second resin, wherein the second resin is a branched acrylic resin and the average particle size of the second resin does not exceed 20 nm; 2-8 parts of a third resin, wherein the third resin is a linear acrylic resin; and 0.1-1 parts of a catalyst, wherein the catalyst has the following structural formula: 0.1 to 1 part of a polydimethylsiloxane leveling agent; 0.5 to 3 parts of a UV absorber, wherein the UV absorber has the following structural formula: 30-50 parts of butyl acetate; 50-80 parts of ethyl acetate; 30-50 parts of curing agent, wherein the curing agent includes polyisophorone diisocyanate and polyhexamethylene diisocyanate.

[0005] Optionally, the first resin has a weight-average molecular weight of 5,000 to 9,000, a glass transition temperature of -30°C to 10°C, and a hydroxyl value of 3% to 4%; the second resin has a weight-average molecular weight of 300 to 800 and a hydroxyl value of 1% to 2%.

[0006] Optionally, the weight ratio of polyisophorone diisocyanate to polyhexamethylene diisocyanate is 1:(4-6).

[0007] Optionally, the raw material formulation, by weight, comprises: 31-45 parts of the first resin; 13-23 parts of the second resin; 3-7 parts of the third resin; 0.2-0.8 parts of the catalyst; 0.1-0.7 parts of the polydimethylsiloxane leveling agent; 0.5-2 parts of the ultraviolet absorber; 32-38 parts of butyl acetate; 55-75 parts of ethyl acetate; and 33-45 parts of the curing agent.

[0008] Optionally, the raw material formulation, by weight, comprises: 34-40 parts of the first resin; 15-20 parts of the second resin; 4-6 parts of the third resin; 0.3-0.7 parts of the catalyst; 0.2-0.5 parts of the polydimethylsiloxane leveling agent; 1-2 parts of the ultraviolet absorber; 33-38 parts of butyl acetate; 50-70 parts of ethyl acetate; and 35-40 parts of the curing agent.

[0009] The present invention also provides a method for preparing the above-mentioned easy-to-clean self-healing car coating material, comprising: providing a first component, the first component comprising a first resin, a second resin, a third resin, a catalyst, a polydimethylsiloxane leveling agent, an ultraviolet absorber, and butyl acetate; providing a second component, the second component comprising the curing agent; providing a third component, the third component comprising ethyl acetate; and mixing the first component, the second component, and the third component uniformly according to their weight proportions and adjusting the viscosity to form the easy-to-clean self-healing car coating material.

[0010] Optionally, the preparation method of the first component includes: mixing the first resin, the second resin, the third resin and a portion of the butyl acetate evenly to form a first system; adding the catalyst, the ultraviolet absorber and the polydimethylsiloxane leveling agent sequentially to the first system while stirring to form a second system; and adding the remaining butyl acetate to the second system to adjust the viscosity.

[0011] Optionally, the preparation method of the second component includes: adding the polyisophorone diisocyanate and the polyhexamethylene diisocyanate in proportion and stirring until uniform.

[0012] Optionally, before mixing the first component, the second component, and the third component, the first component, the second component, and the third component are filtered respectively.

[0013] Optionally, the present invention also provides a coating method for the above-mentioned easy-to-clean self-healing car cover coating material, including: coating with a coating machine, leveling at 20℃~30℃ for 1~3 minutes, and baking in an oven at 85℃~110℃ for 3~6 minutes.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The raw material formula of the easy-to-clean self-healing car coating material of the present invention includes a first resin, a second resin, a third resin, a catalyst, a polydimethylsiloxane leveling agent, an ultraviolet absorber, butyl acetate, ethyl acetate and a curing agent. Through specific formula components and proportions, the car coating not only has self-healing properties, but also has easy cleaning and excellent chemical resistance and tensile properties. Detailed Implementation

[0015] To enable those skilled in the art to better understand the technical solutions in this application, the present invention will be further described below in conjunction with the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0016] This application provides an easy-to-clean self-healing car cover coating material, the raw material formula of which, by weight, includes: a first resin, a second resin, a third resin, a catalyst, a polydimethylsiloxane leveling agent, an ultraviolet absorber, butyl acetate, ethyl acetate, and a curing agent.

[0017] The structural formula of the first resin is as follows:

[0018] The first resin can form an elastic skeleton in the coating material. When damaged by external force, it can be re-leveled by heating due to the high elasticity of its molecular structure, achieving a filling and repair effect. This method can achieve repeated repairs and is simple to operate; it can be repaired by pouring hot water on it. In some embodiments, the weight-average molecular weight of the first resin is 5000 to 9000, and the glass transition temperature is -30℃ to 10℃.

[0019] The second resin is a branched acrylic resin, and its average particle size does not exceed 20 nm. The small particle size of the second resin primarily fills the tiny gaps in the self-healing framework, increasing the density of the coating surface. This prevents ink from pen or marker from easily penetrating deep into the coating, making it easier to wipe clean. Simultaneously, the dense coating provides excellent chemical resistance. The weight-average molecular weight of the second resin can range from 300 to 800.

[0020] The third resin is a linear acrylic resin, and the addition of the linear acrylic resin can improve the flexibility of the coating, enhance the transverse orientation tensile properties of the coating, and facilitate construction.

[0021] The catalyst has the following structural formula:

[0022] The catalyst can promote the reaction between the first resin, the second resin, and the curing agent, thereby accelerating the curing rate of the car wrap coating. Furthermore, the curing rate of the car wrap coating is also related to the hydroxyl content (hydroxyl value) in the first resin and the second resin. In this embodiment, the hydroxyl value of the first resin is 3%–4%, and the hydroxyl value of the second resin is 1%–2%.

[0023] The polydimethylsiloxane leveling agent of this invention can promote wet film leveling, making the coating smooth and improving its gloss.

[0024] The ultraviolet absorber can enhance the light resistance and weather resistance of the car cover coating, and the structural formula of the ultraviolet absorber is as follows:

[0025]

[0026] The butyl acetate is used as a solvent, as the solvent phase, to dissolve the components. The ethyl acetate is used as a diluent.

[0027] The curing agent is a compound system of polyisophorone diisocyanate and polyhexamethylene diisocyanate, which can enhance the self-healing and fast-drying properties of the coating. Meanwhile, the relative ratio of polyisophorone diisocyanate to polyhexamethylene diisocyanate also affects the self-healing and fast-drying capabilities. In this embodiment of the invention, the weight ratio of polyisophorone diisocyanate to polyhexamethylene diisocyanate is controlled at 1:(4-6) to optimize the self-healing and fast-drying properties of the coating.

[0028] The relative proportions of the first resin, second resin, third resin, catalyst, polydimethylsiloxane leveling agent, ultraviolet absorber, butyl acetate, ethyl acetate, and curing agent play a crucial role in the coating's performance. Excessive or insufficient content of any component will affect the coating's self-healing properties, cleaning properties, chemical resistance, tensile properties, and weather resistance. In this embodiment of the invention, the raw material formulation of the easy-to-clean self-healing car cover coating material, by weight, includes: 30-45 parts of the first resin, 10-25 parts of the second resin, 2-8 parts of the third resin, 0.1-1 parts of the catalyst, 0.1-1 parts of the polydimethylsiloxane leveling agent, 0.5-3 parts of the ultraviolet absorber, 30-50 parts of butyl acetate, 50-80 parts of ethyl acetate, and 30-50 parts of the curing agent.

[0029] Preferably, the raw material formulation of the easy-to-clean self-healing car wrap coating material, by weight, comprises: 31-45 parts of the first resin; 13-23 parts of the second resin; 3-7 parts of the third resin; 0.2-0.8 parts of the catalyst; 0.1-0.7 parts of the polydimethylsiloxane leveling agent; 0.5-2 parts of the ultraviolet absorber; 32-38 parts of butyl acetate; 55-75 parts of ethyl acetate; and 33-45 parts of the curing agent.

[0030] More preferably, the raw material formulation of the easy-to-clean self-healing car wrap coating material, by weight, includes: 34-40 parts of the first resin; 15-20 parts of the second resin; 4-6 parts of the third resin; 0.3-0.7 parts of the catalyst; 0.2-0.5 parts of the polydimethylsiloxane leveling agent; 1-2 parts of the ultraviolet absorber; 33-38 parts of butyl acetate; 50-70 parts of ethyl acetate; and 35-40 parts of curing agent.

[0031] This invention also provides a method for preparing the above-mentioned easy-to-clean self-healing car coating material, comprising:

[0032] A first component is provided, comprising the first resin, the second resin, the third resin, the catalyst, the polydimethylsiloxane leveling agent, the ultraviolet absorber, and the butyl acetate;

[0033] A second component is provided, the second component comprising the curing agent;

[0034] A third component is provided, said third component comprising the ethyl acetate;

[0035] The first component, the second component, and the third component are mixed evenly according to their weight proportions and the viscosity is adjusted to form the easy-to-clean self-healing car coating material.

[0036] The preparation method of the first component includes: mixing the first resin, the second resin, the third resin and a portion of the butyl acetate evenly to form a first system; adding the catalyst, the ultraviolet absorber and the polydimethylsiloxane leveling agent sequentially to the first system while stirring to form a second system; and adding the remaining butyl acetate to the second system to adjust the viscosity.

[0037] The preparation method of the second component includes: adding the polyisophorone diisocyanate and the polyhexamethylene diisocyanate in sequence according to a certain ratio and stirring until uniform.

[0038] In some embodiments, the first component, the second component, and the third component are filtered before mixing.

[0039] When applying the easy-to-clean self-healing car cover coating material, a coating machine can be used for coating. The coating should be leveled at 20℃~30℃ for 1~3 minutes and baked in an oven at 85℃~110℃ for 3~6 minutes.

[0040] Example 1

[0041] This embodiment provides a method for preparing an easy-to-clean, self-healing car cover coating material, including:

[0042] The first component is provided, comprising, by weight, 42 parts of a first resin (weight average molecular weight of 5000-9000, hydroxyl value of 3.5%), 15 parts of a second resin (weight average molecular weight of 300-800, hydroxyl value of 1.5%), 5 parts of a linear acrylic resin, 0.5 parts of a catalyst, 0.3 parts of a polydimethylsiloxane leveling agent (BYK Chemicals, BYK333), 2 parts of a UV absorber, and 30 parts of butyl acetate.

[0043] A second component is provided, comprising 7.6 parts of polyisophorone diisocyanate and 30.4 parts of polyhexamethylene diisocyanate.

[0044] A third component is provided, said third component comprising 60 parts of ethyl acetate;

[0045] The first component, the second component, and the third component are mixed evenly according to their weight parts and the viscosity is adjusted to be suitable for coating to form a car cover coating material. The car cover coating material is then leveled at 25°C for 2 minutes using a coating machine and baked in an oven at 85-110°C for 4 minutes to obtain the car cover coating.

[0046] Example 2

[0047] The preparation method can be described in Example 1. The mass parts of each component are as follows: 38 parts of the first resin, 18.1 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 7.6 parts of polyisophorone diisocyanate, 30.4 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0048] Example 3

[0049] The preparation method can be described in Example 1. The mass parts of each component are as follows: 31 parts of the first resin, 22.1 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 7.6 parts of polyisophorone diisocyanate, 30.4 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0050] Example 4

[0051] The preparation method can be described in Example 1. The mass parts of each component are as follows: 42 parts of the first resin, 15 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 6.3 parts of polyisophorone diisocyanate, 31.7 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0052] Example 5

[0053] The preparation method can be described in Example 1. The mass parts of each component are as follows: 38 parts of the first resin, 18.1 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 6.3 parts of polyisophorone diisocyanate, 31.7 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0054] Example 6

[0055] The preparation method can be described in Example 1. The mass parts of each component are as follows: 31 parts of the first resin, 22.1 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 6.3 parts of polyisophorone diisocyanate, 31.7 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0056] Example 7

[0057] The preparation method can be described in Example 1. The mass parts of each component are as follows: 42 parts of the first resin, 15 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 5.4 parts of polyisophorone diisocyanate, 32.6 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0058] Example 8

[0059] The preparation method can be described in Example 1. The mass parts of each component are as follows: 38 parts of the first resin, 18.1 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 5.4 parts of polyisophorone diisocyanate, 32.6 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0060] Example 9

[0061] The preparation method can be described in Example 1. The mass parts of each component are as follows: 31 parts of the first resin, 22.1 parts of the second resin, 5 parts of the linear acrylic resin, 0.5 parts of the catalyst, 0.3 parts of the polydimethylsiloxane leveling agent, 2 parts of the ultraviolet absorber, 30 parts of butyl acetate, 5.4 parts of polyisophorone diisocyanate, 32.6 parts of polyhexamethylene diisocyanate, and 60 parts of ethyl acetate.

[0062] The following tests were conducted on the car wrap coatings of Examples 1 to 9:

[0063] (1) Self-repair test: Use a copper wire brush to scrape back and forth on the surface of the car cover coating 20 times, and then pour hot water at 80℃ to observe whether the scratches can disappear. If the scratches disappear completely, the self-repair effect is excellent. If some scratches remain, the self-repair effect is good. If the scratches do not recover at all, the self-repair effect is poor. The test results are shown in Table 1.

[0064] (2) Easy-to-clean test: Use Chenguang Shuangjie marker to draw on the surface of the car cover coating. After 1 hour, 24 hours and 48 hours, wipe with alcohol. If there is a mark after 1 hour, it is considered poor; if there is no mark after 24 hours, it is considered good; if there is no mark after 48 hours, it is considered excellent. The test results are shown in Table 1.

[0065] (3) Chemical resistance test: Carburetor cleaner was sprayed onto the surface of the car cover coating to completely wet it. After 20s, 30s and 40s, it was wiped with a non-woven cloth. If the paint film fogged and swollen after 20s, it was considered poor; if the paint film was intact after 20s but fogged after 30s, it was considered good; if the paint film did not fogged or swollen after 40s, it was considered excellent. The test results are shown in Table 1.

[0066] (4) Tensile test: The elongation at break of the car cover coating was tested by using a tensile testing machine with constant force. The elongation at break < 80% was poor; 80% < elongation at break < 100% was good; and elongation at break > 100% was excellent. The test results are shown in Table 1.

[0067] (5) Weather resistance test: The car cover coating is applied to a sheet material simulating a car body and placed outdoors. Observe for discoloration or peeling every month. If there is no discoloration or peeling and no obvious change in gloss, it is excellent; if there is no discoloration or peeling and a slight change in gloss, it is good; if there is discoloration or peeling, it is poor. The test results are shown in Table 1.

[0068] Table 1 Results of various performance tests

[0069]

[0070] According to the test results in Table 1, the car cover coatings prepared in Examples 1 to 9 of this application not only have excellent self-healing properties, but also have excellent easy-to-clean properties, chemical resistance, and tensile properties.

[0071] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by using the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. An easy-to-clean, self-healing car cover coating material, characterized in that, Its raw material formula, by weight, includes: 30-45 parts of a first resin, wherein the structural formula of the first resin is as follows: 10 to 25 parts of a second resin, wherein the second resin is a branched acrylic resin and the average particle size of the second resin does not exceed 20 nm; The first resin has a weight-average molecular weight of 5,000 to 9,000, a glass transition temperature of -30°C to 10°C, and a hydroxyl value of 3% to 4%; the second resin has a weight-average molecular weight of 300 to 800 and a hydroxyl value of 1% to 2%. 2 to 8 parts of a third resin, wherein the third resin is a linear acrylic resin; 0.1 to 1 part of catalyst, wherein the catalyst has the following structural formula: 0.1 to 1 part of a polydimethylsiloxane leveling agent; 0.5 to 3 parts of ultraviolet absorber, wherein the ultraviolet absorber has the following structural formula: 30-50 parts of butyl acetate; 50-80 parts of ethyl acetate; 30 to 50 parts of curing agent, wherein the curing agent includes polyisophorone diisocyanate and polyhexamethylene diisocyanate.

2. The easy-to-clean self-healing car cover coating material as described in claim 1, characterized in that, The weight ratio of polyisophorone diisocyanate to polyhexamethylene diisocyanate is 1:(4-6).

3. The easy-to-clean self-healing car cover coating material as described in claim 1, characterized in that, Its raw material formula, by weight, includes: 31 to 45 parts of the first resin; 13 to 23 parts of the second resin; 3 to 7 parts of the third resin; 0.2 to 0.8 parts of the catalyst; 0.1 to 0.7 parts of the aforementioned polydimethylsiloxane leveling agent; 0.5 to 2 parts of the aforementioned ultraviolet absorber; 32-38 parts of butyl acetate; 55-75 parts of ethyl acetate; 33 to 45 parts of curing agent.

4. The easy-to-clean self-healing car cover coating material as described in claim 1, characterized in that, Its raw material formula, by weight, includes: 34 to 40 parts of the first resin; 15 to 20 parts of the second resin; 4 to 6 parts of the third resin; 0.3 to 0.7 parts of the catalyst; 0.2 to 0.5 parts of the aforementioned polydimethylsiloxane leveling agent; 1 to 2 parts of the aforementioned ultraviolet absorber; 33-38 parts of butyl acetate; 50-70 parts of ethyl acetate; 35 to 40 parts of curing agent.

5. A method for preparing an easy-to-clean self-healing car wrap coating material as described in any one of claims 1 to 4, characterized in that, include: A first component is provided, comprising the first resin, the second resin, the third resin, the catalyst, the polydimethylsiloxane leveling agent, the ultraviolet absorber, and the butyl acetate; A second component is provided, the second component comprising the curing agent; A third component is provided, said third component comprising the ethyl acetate; The first component, the second component, and the third component are mixed evenly and the viscosity is adjusted to form the easy-to-clean self-healing car coating material.

6. The method for preparing the easy-to-clean self-healing car cover coating material as described in claim 5, characterized in that, The preparation method of the first component includes: The first resin, the second resin, the third resin, and a portion of the butyl acetate are mixed evenly to form a first system; While stirring, the catalyst, the ultraviolet absorber, and the polydimethylsiloxane leveling agent are added sequentially to the first system to form a second system; The remaining butyl acetate was added to the second system to adjust the viscosity.

7. The preparation method of the easy-to-clean self-healing car cover coating material as described in claim 5, characterized in that, The preparation method of the second component includes: adding the polyisophorone diisocyanate and the polyhexamethylene diisocyanate in proportion and stirring evenly.

8. The method for preparing the easy-to-clean self-healing car cover coating material as described in claim 5, characterized in that, Before mixing the first component, the second component, and the third component, the first component, the second component, and the third component are filtered respectively.

9. A method for applying an easy-to-clean, self-healing car wrap coating material as described in any one of claims 1 to 4, characterized in that, include: Apply the coating using a coating machine, level it at 20℃~30℃ for 1~3 minutes, and bake it in an oven at 85℃~110℃ for 3~6 minutes.

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