High-wear-resistance acrylic polyurethane coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and provides a high-wear-resistance acrylic polyurethane coating and a preparation method thereof. The high-wear-resistance acrylic polyurethane coating comprises a component A and a component B. The component A comprises, by weight, 50-70 parts of waterborne acrylic emulsion, 20-30 parts of deionized water, 10-20 parts of modified ceramic microbeads and 1-5 parts of auxiliaries, the component B is 70-80 parts of an isocyanate curing agent, the modified ceramic microbeads are obtained by modifying ceramic microbeads through a modifier, and the modifier is an aminophenyl diselenide compound. According to the technical scheme, the problems of low wear resistance and low adhesive force of the acrylic polyurethane coating in the prior art are solved.

Description

Technical Field

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

[0002] Acrylic polyurethane coating is a coating system with excellent comprehensive performance. It is made by reacting acrylic resin with 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 machinery manufacturing, transportation, architectural decoration and other fields. Although acrylic polyurethane coating itself has a certain hardness, for some high-wear environments, such as mines and construction sites, sharp ore particles, building materials, etc., in these environments, the coating surface is easily scratched. If the coating is not wear-resistant and has low adhesion, the coating will be quickly eroded, and it is more likely to peel off due to insufficient adhesion, which will lead to the failure of equipment and building structure protection, causing metal corrosion, safety hazards, appearance damage and other problems. Therefore, it is necessary to develop an acrylic polyurethane coating with high wear resistance and strong adhesion. Summary of the invention

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

[0004] The technical scheme of the present invention is as follows: The present invention proposes a highly wear-resistant acrylic polyurethane coating, comprising component A and component B, wherein the component A comprises the following component 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 microbeads, and 1-5 parts of auxiliary agents, and the component B is 70-80 parts of isocyanate curing agent, and the modified ceramic microbeads are obtained by modifying ceramic microbeads with a modifier, and the modifier is an aminophenyl diselenide compound.

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

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

[0007] As a further technical solution, the preparation method of the modified ceramic microbeads comprises the following steps: dispersing the modifier in a solvent, adding the ceramic microbeads, filtering and drying after modification to obtain the modified ceramic microbeads.

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

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

[0010] As a further technical solution, the dispersant includes one or both 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 comprises poly(9-vinyl carbazole), and the mass ratio of the poly(9-vinyl carbazole) to the aqueous acrylic emulsion is 1-1.5:7.

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

[0014] In the present invention, poly(9-vinyl carbazole) is added to component A and mixed 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 withstands friction, reduces the wear and damage of the coating caused by excessive local force, and 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, comprising the following steps: S1. Weigh water-based acrylic emulsion, deionized water, modified ceramic microbeads, and additives, and mix them evenly to obtain component A; S2. Mix component A and component B to obtain acrylic polyurethane coating.

[0016] The working principle and beneficial effects of the present invention are: In the present invention, aqueous acrylic emulsion and isocyanate curing agent are used as main raw materials, and modified ceramic microbeads modified by aminophenyl diselenide are added to prepare acrylic polyurethane coating, so as to enhance the bonding strength between the ceramic microbeads and the substrate, and continuously fill the tiny defects and gaps caused by wear through the self-repairing ability contained in the modifier, so that the coating always maintains a relatively complete structure and a continuous protective interface, thereby continuously and effectively resisting further invasion of external friction force, and improving the wear resistance and adhesion of the acrylic polyurethane coating. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the following examples and comparative examples: Ceramic microbeads: Model W-210, average particle size 3μm; Water-based acrylic emulsion: solid content is 44wt%, viscosity is 1500~2000S, specific gravity is 1.05g / cm 3 , the glass transition temperature is 105℃; Poly(9-vinylcarbazole): molecular weight 24000; Component B: water-based isocyanate curing agent, model XP 2655; Polyether defoamer: The product number is DF-8201, and the manufacturer is Dongguan Defeng Defoamer Co., Ltd.

[0019] Example 1 The preparation method of modified ceramic microbeads comprises the following steps: dispersing 1 part of 4-(4-aminophenyl) diselenylaniline in 200 parts of anhydrous ethanol, adding 20 parts of ceramic microbeads, heating to 70°C for modification for 3 hours, filtering and drying to obtain modified ceramic microbeads; A method for preparing a highly wear-resistant acrylic polyurethane coating comprises the following steps: S1. Weigh 50 parts of water-based 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; S2. Mix component A with 70 parts of component B to obtain an acrylic polyurethane coating.

[0020] Example 2 The preparation method of modified ceramic microbeads comprises the following steps: dispersing 1 part of 4-(4-aminophenyl) diselenylaniline in 200 parts of anhydrous ethanol, adding 20 parts of ceramic microbeads, heating to 75° C. for modification for 2.5 hours, filtering and drying to obtain modified ceramic microbeads; A method for preparing a highly wear-resistant acrylic polyurethane coating comprises the following steps: S1. Weigh 60 parts of water-based acrylic emulsion, 25 parts of deionized water, 15 parts of modified ceramic microbeads, and 1 part of sodium tripolyphosphate, and mix them evenly to obtain component A; S2. Mix component A with 75 parts of component B to obtain an acrylic polyurethane coating.

[0021] Example 3 The preparation method of modified ceramic microbeads comprises the following steps: dispersing 1 part of 4-(4-aminophenyl) diselenylaniline in 200 parts of anhydrous ethanol, adding 20 parts of ceramic microbeads, heating to 80°C for modification for 2 hours, filtering and drying to obtain modified ceramic microbeads; A method for preparing a highly wear-resistant acrylic polyurethane coating comprises the following steps: S1. Weigh 70 parts of water-based acrylic emulsion, 30 parts of deionized water, 20 parts of modified ceramic microbeads, and 1 part of BYK-333, and mix them evenly to obtain component A; S2. Mix component A with 80 parts of component B to obtain an acrylic polyurethane coating.

[0022] Example 4 Compared with Example 3, Example 4 is different in that 4-(4-aminophenyl) diselenylaniline is replaced by an equal amount of bis(2-aminophenyl) diselenide.

[0023] Example 5 Compared with Example 3, the difference of Example 5 is that the added amount of 4-(4-aminophenyl)diselenylaniline is 2 parts.

[0024] Example 6 Compared with Example 4, Example 6 is different in that, when preparing the A component, 10 parts of poly(9-vinylcarbazole) are added.

[0025] Example 7 Compared with Example 6, the difference in Example 7 is that the amount of poly(9-vinylcarbazole) added is 12 parts.

[0026] Example 8 Compared with Example 6, the difference in Example 8 is that the amount of poly(9-vinylcarbazole) added is 15 parts.

[0027] Comparative Example 1 Compared with Example 1, Comparative Example 1 is different in that the modified ceramic microbeads are replaced with an equal amount of ceramic microbeads.

[0028] 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 with a thickness of 80 μm. The test was performed according to the following method: 1. Mass loss: According to the test method specified in GB 1768-2006 "Determination of abrasion resistance of paints and varnishes - Rotating rubber grinding wheel method", the mass loss of the test sample is tested under the test conditions of CS17, 1000g / 1000r.

[0029] 2. Adhesion: Test the adhesion of the sample according to the test method specified in GB / T 5210-2006 "Adhesion test of paints and varnishes by pull-off method".

[0030] The test results are shown in the following table: Table 1 Performance test results of acrylic polyurethane coatings prepared in Examples 1 to 8 and Comparative Example 1

[0031] Compared with Comparative Example 1, Example 1 adds modified ceramic microbeads modified by aminophenyl diselenide compounds. As a result, the mass loss of Example 1 is less than that of Comparative Example 1, and the adhesion is greater than that of Comparative Example 1, indicating that the modified ceramic microbeads can improve the wear resistance and adhesion of acrylic polyurethane coatings.

[0032] Compared with Example 5, Examples 6 to 8 added poly(9-vinyl carbazole), and 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-vinyl carbazole) and aqueous acrylic emulsion play a synergistic role and can improve the wear resistance and adhesion of acrylic polyurethane coatings.

[0033] In Examples 6 to 8, different masses of poly(9-vinyl carbazole) 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-vinyl carbazole) to aqueous acrylic emulsion was 1.2:7, the obtained acrylic polyurethane coating had better wear resistance and adhesion.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly wear-resistant acrylic polyurethane coating, characterized in that: The invention comprises component A and component B, wherein component A comprises the following raw materials in parts by weight: 50-70 parts of waterborne acrylic emulsion, 20-30 parts of deionized water, 10-20 parts of modified ceramic microbeads, and 1-5 parts of auxiliary agent; component B is 70-80 parts of isocyanate curing agent; the modified ceramic microbeads are obtained by modifying ceramic microbeads with a modifier, and the modifier is an aminophenyl diselenide compound.

2. A highly wear-resistant acrylic polyurethane coating according to claim 1, characterized in that: The aminophenyl diselenide compound includes one or two of 4-(4-aminophenyl) diselenide aniline and 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 microbeads is 1-2:

20.

4. A highly wear-resistant acrylic polyurethane coating according to claim 1, characterized in that: The preparation method of the modified ceramic microbeads comprises the following steps: dispersing a modifier in a solvent, adding ceramic microbeads, filtering and drying after modification to obtain the modified ceramic microbeads.

5. A highly wear-resistant acrylic polyurethane coating according to claim 1, characterized in that: The auxiliary agent includes one or more of a defoamer, a dispersant, and a leveling agent.

6. A highly wear-resistant acrylic polyurethane coating according to claim 5, characterized in that: The defoamer includes one or more of an organosilicon defoamer, a polyether defoamer, and a mineral oil defoamer.

7. A highly wear-resistant acrylic polyurethane coating according to claim 5, characterized in that: The dispersant includes one or both of sodium tripolyphosphate and sodium hexametaphosphate.

8. A highly wear-resistant acrylic polyurethane coating according to claim 5, characterized in that: The leveling agent includes one or more of BYK-333, BYK-377, and BYK-381.

9. A highly wear-resistant acrylic polyurethane coating according to claim 1, characterized in that: The A component also includes poly(9-vinyl carbazole), and the mass ratio of the poly(9-vinyl carbazole) to the aqueous acrylic emulsion is 2-3:

14.

10. The method for preparing a highly wear-resistant acrylic polyurethane coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Weigh water-based acrylic emulsion, deionized water, modified ceramic microbeads, and additives, and mix them evenly to obtain component A; S2. Mix component A and component B to obtain acrylic polyurethane coating.

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