A wear-resistant superhydrophobic coating and its preparation method

Abstract

This invention relates to the field of coating technology and discloses a wear-resistant superhydrophobic coating and its preparation method. The wear-resistant superhydrophobic coating prepared by this invention is made by stirring waterborne polyurethane emulsion as the main raw material, adding hydrophobically modified organosilicon, wear-resistant agent, defoamer and other additives. This coating not only has excellent adhesion and wear resistance, but also has superhydrophobic properties. Among them, the introduction of hydrophobically modified organosilicon improves the coating's adhesion strength to the substrate and wear resistance, while the introduced low surface energy fluorine element and -Si-O-Si segments improve the coating's hydrophobicity, giving it superhydrophobic properties.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a wear-resistant superhydrophobic coating and its preparation method. Background Technology

[0002] Superhydrophobic coatings, due to their unique water repellency and self-cleaning capabilities, have broad application prospects in fields such as construction, automobiles, ships, electronic equipment, and medical devices. An ideal superhydrophobic surface must possess a high water contact angle (>150°) and excellent abrasion resistance to withstand mechanical wear in practical use. Traditional superhydrophobic coatings have limited abrasion resistance, and improving abrasion resistance usually requires increasing coating hardness. However, excessive hardness may lead to brittle micro / nano structures, reducing hydrophobic stability. Some superhydrophobic coatings, due to over-reliance on low surface energy materials, exhibit poor adhesion to the substrate and are prone to peeling.

[0003] In recent years, waterborne polyurethane (WPU) has become an ideal substrate material for superhydrophobic coatings due to its advantages such as environmental friendliness, flexibility, and strong adhesion. However, pure WPU coatings lack sufficient hydrophobicity and abrasion resistance, requiring modification to improve their overall performance. Therefore, improving the hydrophobicity, abrasion resistance, and adhesion of coatings while retaining their excellent properties is a problem that researchers currently need to solve. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a wear-resistant superhydrophobic coating and its preparation method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A wear-resistant superhydrophobic coating comprises the following raw materials in parts by weight: 55-65 parts of waterborne polyurethane emulsion, 8-12 parts of hydrophobic modified organosilicon, 5-9 parts of wear-resistant agent, 0.5-0.9 parts of thickener, 0.3-0.6 parts of wetting agent, 1-2 parts of defoamer, 0.5-1 part of leveling agent, and 5-15 parts of water;

[0007] Furthermore, the wear-resistant agent is a mixture of fumed silica, calcium carbonate and barium sulfate after grinding, and the mass ratio of the three is 1:1:1;

[0008] Furthermore, the thickener is ZY-5028, the wetting agent is BASF 4063, the defoamer is KS-604, and the leveling agent is BYK-337;

[0009] The hydrophobically modified organosilicon is prepared by the following steps:

[0010] Step A1: Add 2,6-dichloropyridine-4-methanol, 2-furanmethylamine and cesium carbonate to dimethyl sulfoxide, stir at 105°C for 24 h, add saturated ammonium chloride solution, extract with ethyl acetate, collect the organic layer, wash the organic layer, add anhydrous sodium sulfate to dry, vacuum dry, and purify by column chromatography to obtain intermediate product 1;

[0011] Further, in step A1, the ratio of 2,6-dichloropyridine-4-methanol, 2-furanylamine, cesium carbonate, dimethyl sulfoxide, saturated ammonium chloride solution, ethyl acetate, and anhydrous sodium sulfate is 0.01-0.02 mol: 0.026-0.052 mol: 0.01-0.02 mol: 50 mL: 100 mL: 200 mL: 8-16 g;

[0012] Step A2: Mix intermediate product 1 and 1H,1H,2H,2H-perfluorooctyl acrylate separately in a mixture of methanol and water (volume ratio of methanol to water is 1:1), and transfer them to a flask. Heat the mixture in an oil bath at 60°C and stir for 2.5-4.5 hours. Then distill under reduced pressure and dry to obtain intermediate product 2.

[0013] Further, in step A2, the ratio of intermediate product 1, 1H,1H,2H,2H-perfluorooctyl acrylate and the mixed solution is 0.01mol:0.02-0.022mol:100mL;

[0014] Step A3: Add acrylic acid and intermediate product 2 to xylene, stir for 30 min in an ice-water bath, then add 98 wt% concentrated sulfuric acid and stir for 2-3 h, then heat to 90-110℃ and stir for 12 h, add saturated sodium bicarbonate solution, filter under reduced pressure, wash and dry to obtain hydrophobic modifier.

[0015] Further, in step A3, the ratio of acrylic acid, intermediate product 2, xylene, concentrated sulfuric acid and saturated sodium bicarbonate solution is 0.01 mol: 0.01-0.015 mol: 20 mL: 3-4 mL: 200 mL;

[0016] Step A4: Mix 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane and trifluoromethanesulfonic acid until homogeneous, purge with nitrogen, stir at room temperature for 24 hours, add anhydrous sodium bicarbonate and stir for 1-2 hours, then add anhydrous sodium sulfate and stir for 1 hour, filter, rotary evaporate, collect the concentrated liquid, and vacuum dry to obtain epoxidized organosilicon;

[0017] Further, in step A4, the molar ratio of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane is 1.5-2.5:3-6:1-2.

[0018] Further, in step A4, the amounts of trifluoromethanesulfonic acid, anhydrous sodium bicarbonate, and anhydrous sodium sulfate are 0.4wt%-0.5wt%, 25wt%-35wt%, and 40wt%-50wt% of the total mass of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidyl etheroxypropyltrimethoxysilane, respectively.

[0019] Step A5: Under nitrogen conditions, add the hydrophobic modifier and Karstedt catalyst to toluene and mix evenly. Then heat to 80°C, add the mixture of epoxidized organosilicon and toluene, and heat to 80°C to react for 18-24 hours. Then rotary evaporate, extract, rotary evaporate again, and vacuum dry to obtain hydrophobic modified organosilicon.

[0020] Furthermore, in step A5, the ratio of hydrophobic modifier, Karstedt catalyst, toluene, and mixture is 1.6-4.8 g: 0.00015-0.00045 g: 20 mL: 20 mL;

[0021] Furthermore, in step A5, the ratio of epoxidized organosilicon to toluene in the mixture is 1.5-4.5 g: 20 mL.

[0022] A method for preparing a wear-resistant superhydrophobic coating includes the following steps:

[0023] Step S1: Weigh the raw materials according to the weight parts, and mix the water-based polyurethane emulsion, hydrophobic modified silicone and defoamer in a mixer for 30 minutes to obtain the premix.

[0024] Step S2: Add the wear-resistant agent, thickener, wetting agent, leveling agent and water to the premix in sequence, stir at 500-800 rpm / min for 15-25 min, filter through a 200 mesh filter, apply evenly to the substrate surface, and dry to obtain the wear-resistant superhydrophobic coating.

[0025] The beneficial effects of this invention are:

[0026] The wear-resistant superhydrophobic coating prepared by this invention is made by adding waterborne polyurethane emulsion as the main raw material, and other additives such as hydrophobic modified organosilicon, wear-resistant agent, and defoamer. The coating not only has excellent adhesion and wear resistance, but also has superhydrophobic properties. Among them, the introduction of hydrophobic modified organosilicon improves the coating's bonding strength and wear resistance to the substrate, and the introduction of low surface energy fluorine element and -Si-O-Si segments improves the hydrophobicity of the coating, giving it superhydrophobic properties.

[0027] The coating prepared in this invention incorporates hydrophobically modified organosilicon, which not only improves the coating's adhesion strength to the substrate and its low surface energy characteristics, but also endows the coating with excellent adhesion and superhydrophobic properties. Specifically, the -Si-O-Si- segments in the hydrophobically modified organosilicon form a rigid three-dimensional network after curing, creating an interpenetrating network structure with the soft segments (polyether / polyester) of the WPU, enhancing the coating's hardness and resistance to deformation, and reducing frictional loss. The low surface energy and high chemical stability of fluoroalkanes reduce the coefficient of friction on the coating surface, thereby lowering the wear rate. Free epoxy groups can react with hydroxyl or amino groups in the matrix, increasing crosslinking points and improving the coating's mechanical strength and wear resistance. Long-chain fluoroalkanes and low-surface-energy substances such as -Si-O-Si- segments spontaneously migrate to the coating surface. This leads to a decrease in the surface energy of the coating, thereby further enhancing its hydrophobicity. In addition, during the curing process, the organosilicon segments work synergistically with the wear-resistant agent to form a nano / micro-scale rough structure on the coating surface, achieving superhydrophobicity in conjunction with the low surface energy. The pyridine nitrogen atoms introduced into the hydrophobically modified organosilicon can coordinate with metal ions on the substrate surface, improving the adhesion of the coating to the metal surface. Meanwhile, the furan ring can utilize its polarity to form hydrogen bonds with polar molecules on the substrate surface, stabilizing the coating structure before curing through physical adsorption and preventing a decrease in adhesion due to solvent evaporation. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1: Hydrophobically modified organosilicon was prepared by the following steps:

[0030] Step A1: Add 0.01 mol 2,6-dichloropyridine-4-methanol, 0.026 mol 2-furanylamine and 0.01 mol cesium carbonate to 50 mL of dimethyl sulfoxide, stir at 105 °C for 24 h, add 100 mL of saturated ammonium chloride solution, and extract with 200 mL of ethyl acetate. Collect the organic layer, wash the organic layer, add 8 g of anhydrous sodium sulfate to dry, vacuum dry, and purify by column chromatography to obtain intermediate product 1;

[0031] Step A2: Mix 0.01 mol of intermediate product 1 and 0.02 mol of 1H,1H,2H,2H-perfluorooctyl acrylate in 100 mL of a mixture of methanol and water (volume ratio of methanol to water is 1:1), stir well, transfer to a flask, and stir in an oil bath at 60 °C for 2.5 h. Then distill under reduced pressure and dry to obtain intermediate product 2.

[0032] Step A3: Add 0.01 mol of acrylic acid and 0.01 mol of intermediate product 2 to 20 mL of xylene, stir for 30 min in an ice-water bath, then add 3 mL of 98 wt% concentrated sulfuric acid and stir for 2 h, then heat to 90 °C and stir for 12 h, add 200 mL of saturated sodium bicarbonate solution, filter under reduced pressure, wash and dry to obtain the hydrophobic modifier.

[0033] Step A4: Mix 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and trifluoromethanesulfonic acid until homogeneous. Purge with nitrogen and stir at room temperature for 24 hours. Add anhydrous sodium bicarbonate and stir for 1 hour, then add anhydrous sodium sulfate and stir for 1 hour. Filter, rotary evaporate, collect the concentrated liquid, and vacuum dry to obtain epoxidized organosilicon. The molar ratio of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane is 1.5:6:1. The amounts of trifluoromethanesulfonic acid, anhydrous sodium bicarbonate, and anhydrous sodium sulfate are 0.4 wt%, 25 wt%, and 40 wt% of the total mass of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane, respectively.

[0034] Step A5: Under nitrogen atmosphere, add 1.6g of hydrophobic modifier and 0.00015g of Karstedt catalyst to 20mL of toluene and mix thoroughly. Then heat to 80℃, add 20mL of a mixture of epoxidized organosilicon and toluene, and heat to 80℃ for 18h. Then rotary evaporate, extract, rotary evaporate again, and vacuum dry to obtain hydrophobic modified organosilicon. The ratio of epoxidized organosilicon to toluene in the above mixture is 1.5g:20mL.

[0035] Example 2: Hydrophobically modified organosilicon was prepared by the following steps:

[0036] Step A1: Add 0.015 mol 2,6-dichloropyridine-4-methanol, 0.039 mol 2-furanylamine and 0.015 mol cesium carbonate to 50 mL of dimethyl sulfoxide, stir at 105 °C for 24 h, add 100 mL of saturated ammonium chloride solution, and extract with 200 mL of ethyl acetate. Collect the organic layer, wash the organic layer, add 12 g of anhydrous sodium sulfate to dry, vacuum dry, and purify by column chromatography to obtain intermediate product 1;

[0037] Step A2: Mix 0.01 mol of intermediate product 1 and 0.021 mol of 1H,1H,2H,2H-perfluorooctyl acrylate in 100 mL of a mixture of methanol and water (volume ratio of methanol to water is 1:1), stir well, transfer to a flask, and stir in an oil bath at 60 °C for 3.5 h. Then distill under reduced pressure and dry to obtain intermediate product 2.

[0038] Step A3: Add 0.01 mol of acrylic acid and 0.012 mol of intermediate product 2 to 20 mL of xylene, stir for 30 min in an ice-water bath, then add 3.5 mL of 98 wt% concentrated sulfuric acid and stir for 2.5 h. Then heat to 100 °C and stir for 12 h. Add 200 mL of saturated sodium bicarbonate solution, filter under reduced pressure, wash and dry to obtain the hydrophobic modifier.

[0039] Step A4: Mix 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and trifluoromethanesulfonic acid until homogeneous. Purge with nitrogen and stir at room temperature for 24 hours. Add anhydrous sodium bicarbonate and stir for 1.5 hours, then add anhydrous sodium sulfate and stir for 1 hour. Filter, rotary evaporate, collect the concentrated liquid, and vacuum dry to obtain epoxidized organosilicon. The molar ratio of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane is 2:4.5:1.5. The amounts of trifluoromethanesulfonic acid, anhydrous sodium bicarbonate, and anhydrous sodium sulfate are 0.45 wt%, 30 wt%, and 45 wt% of the total mass of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane, respectively.

[0040] Step A5: Under nitrogen atmosphere, add 3.2g of hydrophobic modifier and 0.0003g of Karstedt catalyst to 20mL of toluene and mix thoroughly. Then heat to 80℃, add 20mL of a mixture of epoxidized organosilicon and toluene, and heat to 80℃ for 21h. Then rotary evaporate, extract, rotary evaporate again, and vacuum dry to obtain hydrophobic modified organosilicon. The ratio of epoxidized organosilicon to toluene in the above mixture is 3g:20mL.

[0041] Example 3: Hydrophobically modified organosilicon was prepared by the following steps:

[0042] Step A1: Add 0.02 mol 2,6-dichloropyridine-4-methanol, 0.052 mol 2-furanylamine and 0.02 mol cesium carbonate to 50 mL of dimethyl sulfoxide, stir at 105 °C for 24 h, add 100 mL of saturated ammonium chloride solution, and extract with 200 mL of ethyl acetate. Collect the organic layer, wash the organic layer, add 16 g of anhydrous sodium sulfate to dry, vacuum dry, and purify by column chromatography to obtain intermediate product 1;

[0043] Step A2: Mix 0.01 mol of intermediate product 1 and 0.022 mol of 1H,1H,2H,2H-perfluorooctyl acrylate in 100 mL of a mixture of methanol and water (volume ratio of methanol to water is 1:1), stir well, transfer to a flask, and stir in an oil bath at 60 °C for 4.5 h. Then distill under reduced pressure and dry to obtain intermediate product 2.

[0044] Step A3: Add 0.01 mol of acrylic acid and 0.015 mol of intermediate product 2 to 20 mL of xylene, stir for 30 min in an ice-water bath, then add 4 mL of 98 wt% concentrated sulfuric acid and stir for 3 h, then heat to 110 °C and stir for 12 h, add 200 mL of saturated sodium bicarbonate solution, filter under reduced pressure, wash and dry to obtain the hydrophobic modifier.

[0045] Step A4: Mix 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and trifluoromethanesulfonic acid until homogeneous. Purge with nitrogen and stir at room temperature for 24 hours. Add anhydrous sodium bicarbonate and stir for 2 hours, then add anhydrous sodium sulfate and stir for 1 hour. Filter, rotary evaporate, collect the concentrated liquid, and vacuum dry to obtain epoxidized organosilicon. The molar ratio of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane is 2.5:3:2. The amounts of trifluoromethanesulfonic acid, anhydrous sodium bicarbonate, and anhydrous sodium sulfate are 0.5 wt%, 35 wt%, and 50 wt% of the total mass of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane, respectively.

[0046] Step A5: Under nitrogen atmosphere, add 4.8g of hydrophobic modifier and 0.00045g of Karstedt catalyst to 20mL of toluene and mix thoroughly. Then heat to 80℃, add 20mL of a mixture of epoxidized organosilicon and toluene, and heat to 80℃ for 24h. Then rotary evaporate, extract, rotary evaporate again, and vacuum dry to obtain hydrophobic modified organosilicon. The ratio of epoxidized organosilicon to toluene in the above mixture is 4.5g:20mL.

[0047] Example 4: A method for preparing a wear-resistant superhydrophobic coating includes the following steps:

[0048] 55 parts of waterborne polyurethane emulsion, 8 parts of hydrophobic modified silicone prepared in Example 1, 5 parts of abrasion resistant agent, 0.5 parts of thickener, 0.3 parts of wetting agent, 1 part of defoamer, 0.5 parts of leveling agent, and 5 parts of water.

[0049] Preferably, the wear-resistant agent is a mixture of fumed silica, calcium carbonate and barium sulfate after grinding, and the mass ratio of the three is 1:1:1;

[0050] Preferably, the thickener is ZY-5028, the wetting agent is BASF 4063, the defoamer is KS-604, and the leveling agent is BYK-337;

[0051] Step S1: Weigh the raw materials according to the weight parts, and mix the waterborne polyurethane emulsion, the hydrophobic modified organosilicon prepared in Example 1 and the defoamer in a mixer for 30 minutes to obtain the premix.

[0052] Step S2: Add the wear-resistant agent, thickener, wetting agent, leveling agent and water to the premix in sequence, stir at 500 rpm / min for 15 min, filter through a 200 mesh filter, apply evenly to the substrate surface, and dry to obtain the wear-resistant superhydrophobic coating.

[0053] Example 5: A method for preparing a wear-resistant superhydrophobic coating includes the following steps:

[0054] 60 parts of waterborne polyurethane emulsion, 10 parts of hydrophobic modified silicone prepared in Example 2, 7 parts of abrasion resistant agent, 0.7 parts of thickener, 0.5 parts of wetting agent, 1.5 parts of defoamer, 0.8 parts of leveling agent, and 10 parts of water.

[0055] Preferably, the wear-resistant agent is a mixture of fumed silica, calcium carbonate and barium sulfate after grinding, and the mass ratio of the three is 1:1:1;

[0056] Preferably, the thickener is ZY-5028, the wetting agent is BASF 4063, the defoamer is KS-604, and the leveling agent is BYK-337;

[0057] Step S1: Weigh the raw materials according to the weight parts, and mix the water-based polyurethane emulsion, the hydrophobic modified organosilicon prepared in Example 2 and the defoamer in a mixer for 30 minutes to obtain the premix.

[0058] Step S2: Add the wear-resistant agent, thickener, wetting agent, leveling agent and water to the premix in sequence, stir at 700 rpm / min for 20 min, filter through a 200 mesh filter, apply evenly to the substrate surface, and dry to obtain the wear-resistant superhydrophobic coating.

[0059] Example 6: A method for preparing a wear-resistant superhydrophobic coating includes the following steps:

[0060] 65 parts of waterborne polyurethane emulsion, 12 parts of hydrophobic modified organosilicon prepared in Example 3, 9 parts of abrasion resistant agent, 0.9 parts of thickener, 0.6 parts of wetting agent, 2 parts of defoamer, 1 part of leveling agent, and 15 parts of water.

[0061] Preferably, the wear-resistant agent is a mixture of fumed silica, calcium carbonate and barium sulfate after grinding, and the mass ratio of the three is 1:1:1;

[0062] Preferably, the thickener is ZY-5028, the wetting agent is BASF 4063, the defoamer is KS-604, and the leveling agent is BYK-337;

[0063] Step S1: Weigh the raw materials according to the weight parts, and mix the waterborne polyurethane emulsion, the hydrophobic modified organosilicon prepared in Example 3 and the defoamer in a mixer for 30 minutes to obtain the premix.

[0064] Step S2: Add the wear-resistant agent, thickener, wetting agent, leveling agent and water to the premix in sequence, stir at 800 rpm / min for 25 min, filter through a 200 mesh filter, apply evenly to the substrate surface, and dry to obtain the wear-resistant superhydrophobic coating.

[0065] Comparative Example 1: This comparative example is a waterborne polyurethane coating. The difference between this example and Example 6 is that polydimethylsiloxane is used instead of the hydrophobic modified organosilicon prepared in Example 3. All other aspects are the same.

[0066] Comparative Example 2: This comparative example is a waterborne polyurethane coating. The difference between this example and Example 6 is that heptadecafluorodecyl methacrylate is used instead of the hydrophobic modified organosilicon prepared in Example 3. All other aspects are the same.

[0067] The coatings prepared in Examples 4-6 and Comparative Examples 1-2 were subjected to performance tests:

[0068] Contact angle test: The water contact angle of the sample surface is measured using a contact angle measuring instrument;

[0069] Adhesion test: The test shall be conducted in accordance with GB / T 9286-88 "Cross-cut test of paint and varnish film";

[0070] Abrasion resistance test: A steel wool abrasion tester was used to test the surface. With a load of 1KG and a test distance of 4CM, rub back and forth 50 times per minute until scratches appear on the surface.

[0071] The test results are shown in Table 1:

[0072]

[0073] As can be seen from Table 1, the contact angle of the coating prepared by the present invention is greater than 150° in the contact angle test, indicating that the coating has good superhydrophobic properties; the adhesion level of the coating is 1 in the adhesion test, indicating that the coating has excellent adhesion; and the wear resistance test shows that the wear resistance cycles are greater than 8000 times, indicating that the coating has excellent wear resistance.

[0074] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A wear-resistant superhydrophobic coating, characterized in that, The raw materials include the following parts by weight: 55-65 parts of waterborne polyurethane emulsion, 8-12 parts of hydrophobic modified silicone, 5-9 parts of abrasion resistant agent, 0.5-0.9 parts of thickener, 0.3-0.6 parts of wetting agent, 1-2 parts of defoamer, 0.5-1 part of leveling agent, and 5-15 parts of water. The hydrophobically modified organosilicon is prepared by hydrosilylation reaction of epoxidized organosilicon and hydrophobic modifier. The epoxidized organosilicon is prepared by reacting 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane and γ-glycidoxypropyltrimethoxysilane under nitrogen and at room temperature for 24 h. The hydrophobic modifier is prepared by esterification reaction of intermediate product 2 and acrylic acid. The intermediate product 2 is prepared by reacting intermediate product 1 and 1H,1H,2H,2H-perfluorooctyl acrylate in an oil bath at 60 °C for 2.5-4.5 h. The intermediate product 1 is prepared by reacting 2,6-dichloropyridine-4-methanol and 2-furanmethylamine at 105 °C for 24 h. The wear-resistant agent is a mixture of fumed silica, calcium carbonate and barium sulfate after grinding, and the mass ratio of the three is 1:1:

1.

2. The wear-resistant superhydrophobic coating according to claim 1, characterized in that, The thickener is ZY-5028, the wetting agent is BASF 4063, the defoamer is KS-604, and the leveling agent is BYK-337.

3. The wear-resistant superhydrophobic coating according to claim 1, characterized in that, The hydrophobically modified organosilicon is prepared by the following steps: Step A1: Add 2,6-dichloropyridine-4-methanol, 2-furanmethylamine and cesium carbonate to dimethyl sulfoxide, stir at 105°C for 24 h, add saturated ammonium chloride solution, extract with ethyl acetate, collect the organic layer, wash the organic layer, add anhydrous sodium sulfate to dry, vacuum dry, and purify by column chromatography to obtain intermediate product 1; Step A2: Mix intermediate product 1 and 1H,1H,2H,2H-perfluorooctyl acrylate in a mixture of methanol and water, and transfer them to a flask. Heat the mixture in an oil bath at 60°C for 2.5-4.5 hours with stirring. Then distill under reduced pressure and dry to obtain intermediate product 2. Step A3: Add acrylic acid and intermediate product 2 to xylene, stir for 30 min in an ice-water bath, then add 98 wt% concentrated sulfuric acid and stir for 2-3 h, then heat to 90-110℃ and stir for 12 h, add saturated sodium bicarbonate solution, filter under reduced pressure, wash and dry to obtain hydrophobic modifier. Step A4: Mix 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane and trifluoromethanesulfonic acid until homogeneous, purge with nitrogen, stir at room temperature for 24 hours, add anhydrous sodium bicarbonate and stir for 1-2 hours, then add anhydrous sodium sulfate and stir for 1 hour, filter, rotary evaporate, collect the concentrated liquid, and vacuum dry to obtain epoxidized organosilicon; Step A5: Under nitrogen conditions, add the hydrophobic modifier and Karstedt catalyst to toluene and mix thoroughly. Then heat to 80°C, add the mixture of epoxidized organosilicon and toluene, and heat to 80°C for 18-24 hours. Then rotary evaporate, extract, rotary evaporate again, and vacuum dry to obtain the hydrophobic modified organosilicon.

4. The wear-resistant superhydrophobic coating according to claim 3, characterized in that, In step A1, the ratio of 2,6-dichloropyridine-4-methanol, 2-furanylamine, cesium carbonate, dimethyl sulfoxide, saturated ammonium chloride solution, ethyl acetate, and anhydrous sodium sulfate is 0.01-0.02 mol: 0.026-0.052 mol: 0.01-0.02 mol: 50 mL: 100 mL: 200 mL: 8-16 g.

5. The wear-resistant superhydrophobic coating according to claim 3, characterized in that, In step A2, the ratio of intermediate product 1, 1H,1H,2H,2H-perfluorooctyl acrylate and the mixed solution is 0.01 mol: 0.02-0.022 mol: 100 mL.

6. The wear-resistant superhydrophobic coating according to claim 3, characterized in that, In step A3, the ratio of acrylic acid, intermediate product 2, xylene, concentrated sulfuric acid and saturated sodium bicarbonate solution is 0.01 mol: 0.01-0.015 mol: 20 mL: 3-4 mL: 200 mL.

7. The wear-resistant superhydrophobic coating according to claim 3, characterized in that, In step A4, the molar ratio of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane is 1.5-2.5:3-6:1-2.

8. The wear-resistant superhydrophobic coating according to claim 3, characterized in that, In step A4, the amounts of trifluoromethanesulfonic acid, anhydrous sodium bicarbonate, and anhydrous sodium sulfate are 0.4wt%-0.5wt%, 25wt%-35wt%, and 40wt%-50wt% of the total mass of 2,4,6,8-tetramethylcyclotetrasiloxane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane, respectively.

9. The wear-resistant superhydrophobic coating according to claim 3, characterized in that, In step A5, the ratio of hydrophobic modifier, Karstedt catalyst, toluene and mixture is 1.6-4.8g:0.00015-0.00045g:20mL:20mL, and the ratio of epoxidized organosilicon and toluene in the mixture is 1.5-4.5g:20mL.

10. A method for preparing the wear-resistant superhydrophobic coating according to any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Weigh the raw materials according to the weight parts, and mix the water-based polyurethane emulsion, hydrophobic modified silicone and defoamer in a mixer for 30 minutes to obtain the premix. Step S2: Add the wear-resistant agent, thickener, wetting agent, leveling agent and water to the premix in sequence, stir at 500-800 rpm / min for 15-25 min, filter through a 200 mesh filter, apply evenly to the substrate surface, and dry to obtain the wear-resistant superhydrophobic coating.

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