A highly wear-resistant acrylic polyurethane coating and its preparation method

Abstract

The present invention relates to the technical field of coatings, and provides a highly wear-resistant acrylic polyurethane coating and a preparation method thereof. A highly wear-resistant acrylic polyurethane coating includes component A and component B. Component A comprises the following raw materials in parts by weight: 50-70 parts of an aqueous acrylic emulsion, 20-30 parts of deionized water, 10-20 parts of modified ceramic microspheres, and 1-5 parts of an additive. Component B is 70-80 parts of an isocyanate curing agent. The modified ceramic microspheres are obtained by modifying ceramic microspheres with a modifier, and the modifier is an aminophenyl diselenide compound. Through the above technical solution, the problems of low wear resistance and low adhesion of acrylic polyurethane coatings in the related art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and specifically, to a highly wear-resistant acrylic polyurethane coating and a preparation method thereof. Background Art

[0002] As a coating system with excellent comprehensive properties, acrylic polyurethane coating is made by the reaction of acrylic resin and isocyanate curing agent. Acrylic polyurethane coating combines the good weather resistance, light and color retention of acrylic resin and the high mechanical properties of polyurethane, and is widely used in the fields of machinery manufacturing, transportation, building decoration, etc. Although acrylic polyurethane coating itself has a certain hardness, for some high-wear environments, such as mines, construction sites, etc., in these environments, sharp ore particles, building materials, etc. are likely to scratch the surface of the coating. If the coating is not wear-resistant and has low adhesion, the coating will be quickly abraded, and it is more likely to peel off in large areas due to insufficient adhesion, which will lead to the failure of equipment and building structure protection, causing problems such as metal corrosion, safety hazards, and damaged appearance. Therefore, it is necessary to develop an acrylic polyurethane coating with high wear resistance and strong adhesion. Summary of the Invention

[0003] The present invention provides a highly wear-resistant acrylic polyurethane coating and a preparation method thereof, which solve the problems of low wear resistance and low adhesion of acrylic polyurethane coating in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides a highly wear-resistant acrylic polyurethane coating, which includes component A and component B. The component A includes the following raw materials in parts by weight: 50-70 parts of aqueous acrylic emulsion, 20-30 parts of deionized water, 10-20 parts of modified ceramic microspheres, and 1-5 parts of additives. The component B is 70-80 parts of isocyanate curing agent. The modified ceramic microspheres are obtained by modifying ceramic microspheres with a modifier, and the modifier is an aminophenyl diselenium compound.

[0005] As a further technical solution, the aminophenyl diselenium compound includes one or two of 4-(4-aminophenyl)diselenoaniline and bis(2-aminophenyl) diselenide.

[0006] As a further technical solution, the mass ratio of the modifier to the ceramic microspheres is 1-2:20.

[0007] As a further technical solution, the preparation method of the modified ceramic microspheres includes the following steps: dispersing the modifier in a solvent, adding ceramic microspheres, and obtaining the modified ceramic microspheres after modification by filtration and drying.

[0008] As a further technical solution, the additives include one or more of defoamer, dispersant, and leveling agent.

[0009] As a further technical solution, the defoamer includes one or more of silicone defoamers, polyether defoamers, and mineral oil defoamers.

[0010] As a further technical solution, the dispersant includes one or two of sodium tripolyphosphate and sodium hexametaphosphate.

[0011] As a further technical solution, the leveling agent includes one or more of BYK-333, BYK-377, and BYK-381.

[0012] As a further technical solution, the component A further includes poly(9-vinylcarbazole), and the mass ratio of poly(9-vinylcarbazole) to the aqueous acrylic emulsion is 1-1.5:7.

[0013] As a further technical solution, the mass ratio of poly(9-vinylcarbazole) to the aqueous acrylic emulsion is 1.2:7.

[0014] In the present invention, poly(9-vinylcarbazole) is added to the component A and used in combination with the aqueous acrylic emulsion to exert the synergistic effect of the two. Through the mutual interweaving and entanglement of molecular chains, a denser and more stable network structure is formed, which effectively disperses and bears the frictional force, reduces the wear and damage of the coating caused by excessive local stress, and thus further improves the wear resistance and adhesion of the acrylic polyurethane coating.

[0015] The present invention also provides a method for preparing a highly wear-resistant acrylic polyurethane coating, which includes the following steps:

[0016] S1. Weigh the aqueous acrylic emulsion, deionized water, modified ceramic microspheres, and additives, and mix them evenly to obtain the component A;

[0017] S2. Mix the component A with the component B to obtain the acrylic polyurethane coating.

[0018] The working principle and beneficial effects of the present invention are as follows:

[0019] In the present invention, an acrylic polyurethane coating is prepared by using an aqueous acrylic emulsion and an isocyanate curing agent as the main raw materials and adding modified ceramic microspheres obtained by modifying with an aminophenyl diselenide compound, enhancing the bonding strength between the ceramic microspheres and the substrate. Through the self-healing ability contained in the modifier, the tiny defects and gaps generated due to wear are continuously filled, so that the coating always maintains a relatively complete structure and a continuous protective interface, thereby continuously and effectively resisting the further invasion of external frictional force and improving the wear resistance and adhesion of the acrylic polyurethane coating. Specific embodiments

[0020] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0021] In the following examples and comparative examples:

[0022] Ceramic microbeads: Model W-210, average particle size 3 μm;

[0023] Waterborne acrylic emulsion: Solid content 44 wt%, viscosity 1500 - 2000 S, specific gravity 1.05 g / cm 3 , glass transition temperature 105 °C;

[0024] Poly(9-vinylcarbazole): Molecular weight 24000;

[0025] Component B: Waterborne isocyanate curing agent, model XP 2655;

[0026] Polyether defoamer: Product number DF-8201, manufacturer Dongguan Defeng Defoamer Co., Ltd.

[0027] Example 1

[0028] The preparation method of the modified ceramic microbeads includes the following steps: Disperse 1 part of 4-(4-aminophenyl)diselenoaniline in 200 parts of absolute ethanol, add 20 parts of ceramic microbeads, heat to 70 °C for modification for 3 h, and then obtain the modified ceramic microbeads after filtration and drying;

[0029] The preparation method of a highly wear-resistant acrylic polyurethane coating includes the following steps:

[0030] S1. Weigh 50 parts of waterborne acrylic emulsion, 20 parts of deionized water, 10 parts of modified ceramic microbeads, and 1 part of polyether defoamer, and mix them evenly to obtain Component A;

[0031] S2. Mix Component A with 70 parts of Component B to obtain the acrylic polyurethane coating.

[0032] Example 2

[0033] The preparation method of the modified ceramic microbeads includes the following steps: Disperse 1 part of 4-(4-aminophenyl)diselenoaniline in 200 parts of absolute ethanol, add 20 parts of ceramic microbeads, heat to 75 °C for modification for 2.5 h, and then obtain the modified ceramic microbeads after filtration and drying;

[0034] The preparation method of a highly wear-resistant acrylic polyurethane coating includes the following steps:

[0035] S1. Weigh 60 parts of waterborne acrylic emulsion, 25 parts of deionized water, 15 parts of modified ceramic microspheres, and 1 part of sodium tripolyphosphate, and mix them evenly to obtain Component A;

[0036] S2. Mix Component A with 75 parts of Component B to obtain the acrylic polyurethane coating.

[0037] Example 3

[0038] The preparation method of the modified ceramic microspheres includes the following steps: Disperse 1 part of 4-(4-aminophenyl) diselenoaniline in 200 parts of absolute ethanol, add 20 parts of ceramic microspheres, heat up to 80 °C for modification for 2 hours, and then obtain the modified ceramic microspheres through filtration and drying;

[0039] A preparation method of a highly wear-resistant acrylic polyurethane coating includes the following steps:

[0040] S1. Weigh 70 parts of waterborne acrylic emulsion, 30 parts of deionized water, 20 parts of modified ceramic microspheres, and 1 part of BYK-333, and mix them evenly to obtain Component A;

[0041] S2. Mix Component A with 80 parts of Component B to obtain the acrylic polyurethane coating.

[0042] Example 4

[0043] Compared with Example 3, the difference in Example 4 is that 4-(4-aminophenyl) diselenoaniline is replaced with an equal amount of bis(2-aminophenyl) diselenide.

[0044] Example 5

[0045] Compared with Example 3, the difference in Example 5 is that the addition amount of 4-(4-aminophenyl) diselenoaniline is 2 parts.

[0046] Example 6

[0047] Compared with Example 4, the difference in Example 6 is that when preparing Component A, 10 parts of poly(9-vinylcarbazole) are added.

[0048] Example 7

[0049] Compared with Example 6, the difference in Example 7 is that the addition amount of poly(9-vinylcarbazole) is 12 parts.

[0050] Example 8

[0051] Compared with Example 6, the difference in Example 8 is that the addition amount of poly(9-vinylcarbazole) is 15 parts.

[0052] Comparative Example 1

[0053] Compared with Example 1, the difference in Comparative Example 1 is that the modified ceramic microspheres are replaced with an equal amount of ceramic microspheres.

[0054] The acrylic polyurethane coatings prepared in Examples 1 to 8 and Comparative Example 1 were sprayed on steel plates and cured for 5 days to obtain a paint film thickness of 80 μm, and the tests were carried out according to the following methods:

[0055] 1. Mass loss: According to the test method specified in GB 1768-2006 "Paints and varnishes - Determination of abrasion resistance - Rotating rubber wheel method", the mass loss of the sample was tested, and the test conditions were CS17, 1000 g / 1000 r.

[0056] 2. Adhesion: According to the test method specified in GB / T 5210-2006 "Paints and varnishes - Pull-off adhesion test", the adhesion of the sample was tested.

[0057] The test results are shown in the following table:

[0058] Table 1 Performance test results of the acrylic polyurethane coatings prepared in Examples 1 to 8 and Comparative Example 1

[0059]

[0060] Compared with Comparative Example 1, the modified ceramic microspheres obtained by modification with aminophenyl diselenide compound were added in Example 1. As a result, the mass loss of Example 1 was less than that of Comparative Example 1, and the adhesion was greater than that of Comparative Example 1, indicating that the modified ceramic microspheres can improve the wear resistance and adhesion of the acrylic polyurethane coating.

[0061] Compared with Example 5, poly(9-vinylcarbazole) was added in Examples 6 to 8. As a result, the mass loss of Examples 6 to 8 was less than that of Example 5, and the adhesion was greater than that of Example 5, indicating that poly(9-vinylcarbazole) and the aqueous acrylic emulsion play a synergistic role, which can improve the wear resistance and adhesion of the acrylic polyurethane coating.

[0062] In Examples 6 to 8, different masses of poly(9-vinylcarbazole) were added. As a result, the mass loss of Example 7 was less than that of Examples 6 and 8, and the adhesion was greater than that of Examples 6 and 8, indicating that when the mass ratio of poly(9-vinylcarbazole) to the aqueous acrylic emulsion is 1.2:7, the obtained acrylic polyurethane coating has better wear resistance and adhesion.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly wear-resistant acrylic polyurethane coating, characterized in that, It includes Component A and Component B. Component A includes the following raw materials in parts by weight: 50 - 70 parts of aqueous acrylic emulsion, 20 - 30 parts of deionized water, 10 - 20 parts of modified ceramic microspheres, and 1 - 5 parts of additives. Component B is 70 - 80 parts of isocyanate curing agent. The modified ceramic microspheres are obtained by modifying ceramic microspheres with a modifier, and the modifier is an aminophenyl diselenide compound; Component A further includes poly(9-vinylcarbazole), and the mass ratio of poly(9-vinylcarbazole) to the aqueous acrylic emulsion is 2 - 3:14; The preparation method of the modified ceramic microspheres includes the following steps: Disperse the modifier in a solvent, add the ceramic microspheres, and after modification, filter and dry to obtain the modified ceramic microspheres.

2. The high-wear-resistant acrylic polyurethane coating according to claim 1, wherein The aminophenyl diselenide compound is bis(2-aminophenyl) diselenide.

3. A highly wear-resistant acrylic polyurethane coating according to claim 1, characterized in that, The mass ratio of the modifier to the ceramic microspheres is 1 - 2:

20.

4. A highly wear-resistant acrylic polyurethane coating according to claim 1, characterized in that, The additives include one or more of defoamers, dispersants, and leveling agents.

5. A highly wear-resistant acrylic polyurethane coating according to claim 4, characterized in that, The defoamers include one or more of silicone defoamers, polyether defoamers, and mineral oil defoamers.

6. The highly wear-resistant acrylic polyurethane coating according to claim 4, characterized in that, The dispersants include one or two of sodium tripolyphosphate and sodium hexametaphosphate.

7. A highly wear-resistant acrylic polyurethane coating according to claim 4, wherein, The leveling agents include one or more of BYK-333, BYK-377, and BYK-381.

8. A preparation method of a highly wear-resistant acrylic polyurethane coating according to any one of claims 1 to 7, characterized in that, It includes the following steps: S1. Weigh the aqueous acrylic emulsion, deionized water, modified ceramic microspheres, additives, and poly(9-vinylcarbazole), and mix them evenly to obtain Component A; S2. Mix Component A and Component B to obtain the acrylic polyurethane coating.

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