Antistatic coating for running board and preparation method thereof

Abstract

The invention relates to the technical field of coating preparation, and discloses an antistatic coating for a running board and a preparation method thereof, the antistatic coating comprises the following raw materials by weight: 100-120 parts of a composite emulsion, 10-20 parts of a dispersant, 5-10 parts of an antifoaming agent, 10-15 parts of a stabilizer, 30-40 parts of zinc oxide, 10-20 parts of ultrafine aluminum silicate, 30-40 parts of titanium dioxide and 40-60 parts of deionized water. The composite emulsion is prepared by initiating copolymerization of a modified monomer, an acrylate monomer and a modified filler under the action of potassium persulfate. The strong electronegativity of fluorine atoms on a modified monomer chain enables the modified monomer to form a low-surface-energy structure on the surface of the coating, a polyacrylate material is endowed with good perspiration corrosion resistance, meanwhile, the modified filler is high in chemical inertness, water vapor and corrosive medium permeation is blocked, and the corrosion resistance of the material is improved. The modified filler is grafted with the polymer molecular chain to form a latticed structure, and the latticed structure can disperse stress and improve the wear resistance of the coating; the composite emulsion improves the conductivity by reducing the material resistance and carbon black, and improves the antistatic performance of the material.

Description

Technical Field

[0001] The invention relates to the technical field of coating preparation, and in particular to an antistatic coating for a treadmill and a preparation method thereof. Background Art

[0002] With economic development, more and more people are using treadmills for fitness. However, as treadmill use increases, the prolonged friction between the running deck, rollers, running belt, and shoe soles can cause static electricity to accumulate. This static electricity accumulation can pose safety risks, such as excessive static electricity affecting the user's personal safety, static interference causing garbled display screens, and thus affecting the treadmill's precise speed control. Therefore, the use of antistatic coatings has become a direction for solving these problems.

[0003] Antistatic coatings typically consist of resins, curing agents, fillers, and conductive materials. Once applied and cured, these ingredients form a durable, antistatic coating. Antistatic coatings are also easy to handle and maintain, and as a functional coating material, they hold broad application prospects in the electronics, automotive, and medical industries.

[0004] With the application of antistatic coatings in treadmills, the static electricity problem has been solved to a certain extent. However, the antistatic effect of the coatings currently used in treadmills is weak. In addition, as the use time increases, the rapid friction between the treadmill and the rollers, treadmill belts, and shoe soles will also cause physical wear on the surface of the coating on the treadmill. The treadmill is prone to corrosion and penetration due to long-term contact with sweat, which will cause the antistatic performance, wear resistance, and corrosion resistance of the antistatic coating to deteriorate. These problems will affect the service life of the coating on the treadmill.

[0005] Therefore, it is necessary to develop a new antistatic coating for running boards and modify the important components of the existing antistatic coating to solve the problems arising in practical applications. Summary of the Invention

[0006] The purpose of the present invention is to provide an antistatic coating for a treadmill and a preparation method thereof, which solves the problems of weak antistatic effect, poor sweat corrosion resistance and poor wear resistance of the coatings currently used for treadmills.

[0007] The purpose of the present invention can be achieved through the following technical solutions: A method for preparing an antistatic coating for a running board comprises the following steps: Step S1: uniformly mixing the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, modified filler, and deionized water, stirring and adding potassium persulfate at a speed of 150-200 r / min and a temperature of 25-30° C., reacting for 4 hours, then raising the temperature to 90-100° C. and continuing the reaction for 1-2 hours to obtain a composite emulsion; Step S2: Weigh the following raw materials in parts by weight: 100-120 parts of composite emulsion, 10-20 parts of dispersant, 5-10 parts of defoaming agent, 10-15 parts of stabilizer, 30-40 parts of zinc oxide, 10-20 parts of ultrafine aluminum silicate, 30-40 parts of titanium dioxide and 40-60 parts of deionized water, mix the raw materials evenly, and prepare an antistatic coating.

[0008] Furthermore, the weight ratio of the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, potassium persulfate, deionized water and modified filler in step S1 is 100-120:180-200:110-130:50-70:1-3:55-70:60-80.

[0009] Furthermore, the dispersant described in step S2 is a mixture of one or more of ACUMER 9300, OROTAN 1124 and DispesUltra PA 4560 in any proportion, the defoamer is a mixture of one or more of BYK-024, BYK-052N and DC62 in any proportion, the stabilizer is a mixture of one or more of Tinuvin 292, Tinuvin 123, Tinuvin 1130 and Tinuvin 400 in any proportion, the ultrafine aluminum silicate is an aluminum silicate powder with an average particle size of ≤1.5 μm and a whiteness of ≥97%, and the titanium dioxide is a mixture of one or more of PA101, R-960, SR-237 and R706 in any proportion.

[0010] Furthermore, the modified monomer is prepared by the following steps: Step A1: Tridecafluorooctanol, boron trifluoride etherate, and acetone were uniformly mixed, stirred at a speed of 150-200 r / min and a temperature of 25-30°C, and epichlorohydrin was added. The temperature was raised to 70-75°C, and the reaction was carried out for 5-8 hours. Sodium hydroxide solution was added and the reaction was carried out for 3-5 hours to obtain Intermediate 1; Step A2: Intermediate 1, ZnCl2 solution and dimethyl sulfoxide are mixed uniformly, and diethanolamine is added under stirring at a speed of 120-150 r / min and a temperature of 20-25°C. The mixture is reacted for 2-3 hours to obtain Intermediate 2. Intermediate 2 and acetonitrile are mixed uniformly, and benzyl chloride and ethyl bromide are added under stirring at a speed of 110-130 r / min and a temperature of 60-70°C. The mixture is reacted for 3-4 hours to obtain Intermediate 3. Step A3: Intermediate 3, acrylic acid and dimethylformamide are uniformly mixed, stirred at a speed of 200-300 r / min and a temperature of 20-25°C, and perfluorobutyl ammonium sulfonate and p-hydroxyanisole are added. After stirring for 10 minutes, the temperature is raised to 80°C and the reaction is carried out for 2-3 hours. The temperature is then raised to 90°C and the reaction is carried out for 2-3 hours to obtain a modified monomer.

[0011] Furthermore, the amount ratio of tridecafluorooctanol, epichlorohydrin and sodium hydroxide solution in step A1 is 10mmol:10mmol:25mL, the amount of boron trifluoride ether is 3-5% of the mass of tridecafluorooctanol, and the mass fraction of sodium hydroxide solution is 25%.

[0012] Furthermore, in step A2, the molar ratio of the epoxy group on the intermediate 1 to the secondary amine on the diethanolamine is 1:1, the mass fraction of the ZnCl2 solution is 5-10%, the amount of ZnCl2 solution used is 3-5% of the mass of diethanolamine, and the molar ratio of intermediate 2, acetonitrile, benzyl chloride and ethyl bromide is 1:1.5:1.5:1.

[0013] Furthermore, the molar ratio of the hydroxyl group on the intermediate 3 and the carboxyl group on the acrylic acid in step A3 is 1:1, the amount of perfluorobutyl ammonium sulfonate used is 3-5% of the mass of the acrylic acid, and the amount of p-hydroxyanisole used is 1% of the mass of the acrylic acid.

[0014] Furthermore, the modified filler is prepared by the following steps: Step B1: Cetyltrimethylammonium bromide, deionized water, anhydrous ethanol, and aqueous ammonia are uniformly mixed, and γ-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate are added under stirring at a speed of 200-250 r / min, a temperature of 20-25° C., and a pH of 7-8. The temperature is raised to 55-65° C., and the reaction is carried out for 4-6 hours. The temperature is then raised to 80-90° C., and nano-alumina is added. The mixture is stirred for 10-20 minutes, and then aged for 10-15 hours to produce pretreated silica. Step B2: dispersing carbon black in ethanol, stirring, adding deionized water and 3-aminopropyltriethoxysilane at a speed of 200-300 r / min, a temperature of 60-80° C., and a pH of 4-5, and reacting for 8-10 hours to obtain pretreated carbon black; Step B3: Mix the pretreated silica, ZnCl2 solution and dimethyl sulfoxide evenly, stir and add pretreated carbon black at a speed of 120-150 r / min and a temperature of 20-25°C, and react for 2-3 hours to obtain a composite filler; mix the composite filler, acrylic acid and ethanol evenly, stir and add concentrated sulfuric acid at a speed of 300-500 r / min and a temperature of 80-90°C, and react for 2-3 hours to obtain a modified filler.

[0015] Furthermore, the amount ratio of hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, ammonia water and tetraethyl orthosilicate in step B1 is 0.35g:100mL:60mL:2mL:1.80g, the amount of γ-glycidyloxypropyltrimethoxysilane is 1-5% of the mass of tetraethyl orthosilicate, and the amount of nano-alumina is 20-35% of the mass of tetraethyl orthosilicate.

[0016] Furthermore, the amount of 3-aminopropyltriethoxysilane used in step B2 is 5-10% of the mass of carbon black.

[0017] Furthermore, the amount ratio of the pretreated silica, pretreated carbon black and ZnCl2 solution in step B3 is 2.5g:1.7g:10mL, the mass fraction of the ZnCl2 solution is 5-10%, the amount ratio of the composite filler, acrylic acid and concentrated sulfuric acid is 6.5g:10mL:2mL, and the mass fraction of the concentrated sulfuric acid is 95%.

[0018] Beneficial effects of the present invention: An antistatic coating for a running board prepared by the present invention comprises the following raw materials: a composite emulsion, a dispersant, a defoaming agent, a stabilizer, zinc oxide, ultrafine aluminum silicate, titanium dioxide, and deionized water. The composite emulsion is prepared by a mixed reaction of a modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, a modified filler, and deionized water. Modified monomer: The alcoholic hydroxyl group on tridecafluorooctanol reacts with the epoxy group on epichlorohydrin to undergo a nucleophilic substitution reaction to generate an ether, which is then ring-closed under the action of a sodium hydroxide solution to form a new epoxy group, thereby obtaining intermediate 1. Intermediate 1 is subjected to a ring-opening reaction with diethanolamine, breaking the CO bond of the epoxy ring to form a stable β-hydroxyamine product intermediate 2. Intermediate 2 is subjected to a secondary amine quaternization reaction with ethyl bromide to generate intermediate 3. Intermediate 3 is reacted with acrylic acid, resulting in an esterification reaction between the hydroxyl group on intermediate 3 and the carboxyl group on acrylic acid, thereby obtaining a modified monomer. Modified filler: The ethoxy group of tetraethyl orthosilicate reacts with water to form silanol. The methoxy group of γ-glycidoxypropyltrimethoxysilane hydrolyzes into silanol under alkaline conditions. The silanols condense with each other to form a stable Si-O-Si bond (i.e., SiO2). Nano-alumina is added, and the silanol condenses with the hydroxyl groups on the surface of the nano-alumina to form a stable Si-O-Al bond, thereby producing pretreated silica. The ethoxy group of 3-aminopropyltriethoxysilane hydrolyzes into silanol under acidic conditions, which condenses with the hydroxyl groups on the surface of carbon black to form a stable Si-OC bond, thereby grafting the amino chain segment of 3-aminopropyltriethoxysilane onto the carbon black surface to produce pretreated carbon black. The hydroxyl groups of the composite filler and the carboxyl groups of acrylic acid undergo an esterification reaction catalyzed by concentrated sulfuric acid, introducing carbon-carbon double bonds into the composite filler to produce a modified filler. The polymer molecules in the composite emulsion contain quaternary ammonium salts, whose hydrophilic groups can ionize and form an ion-conducting network, which can reduce the surface resistance of the material. The microporous structure of the carbon black in the modified filler molecular chain can absorb environmental moisture, enhance ion conductivity through a proton hopping mechanism, and improve the material's antistatic properties. The strong electronegativity of fluorine atoms causes them to form a low-surface-energy structure on the coating surface, endowing the polyacrylate material with excellent resistance to strong acid and alkali corrosion. The modified filler is highly chemically inert, blocking the penetration of water vapor and corrosive media, improving the material's corrosion resistance. Nanoalumina has a high Mohs hardness, and its addition can significantly improve the coating's scratch and wear resistance. The modified filler grafts onto the polymer molecular chain, forming a grid-like structure. This grid structure can disperse stress, preventing cracks in the coating due to substrate shrinkage or vibration, and improving the material's mechanical properties. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0020] Example 1, a method for preparing an antistatic coating for a running board, specifically comprising the following steps: Step S1: uniformly mixing the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, modified filler, and deionized water, stirring at a speed of 150 r / min and a temperature of 25° C., adding potassium persulfate, and reacting for 4 h, then raising the temperature to 90° C. and continuing the reaction for 1 h to prepare a composite emulsion; Step S2: Weigh the following raw materials in parts by weight: 100 parts of composite emulsion, 10 parts of dispersant, 5 parts of defoaming agent, 10 parts of stabilizer, 30 parts of zinc oxide, 10 parts of ultrafine aluminum silicate, 30 parts of titanium dioxide and 40 parts of deionized water, mix the raw materials evenly, and prepare an antistatic coating.

[0021] The weight ratio of the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, potassium persulfate, deionized water and modified filler in step S1 is 100:180:110:50:1:55:60.

[0022] The dispersant described in step S2 is a mixture of ACUMER 9300, OROTAN 1124 and Dispes Ultra PA 4560 in a mass ratio of 1:1.3:1.7, the defoamer is BYK-024, the stabilizer is a mixture of Tinuvin 292 and Tinuvin 123 in a mass ratio of 1:1.3, the ultrafine aluminum silicate is an aluminum silicate powder with an average particle size of ≤1.5μm and a whiteness of ≥97%, and the titanium dioxide is a mixture of PA101, R-960, SR-237 and R706 in a mass ratio of 1:1.3:1.7:1.4.

[0023] The modified monomer is prepared by the following steps: Step A1: Tridecafluorooctanol, boron trifluoride etherate, and acetone were mixed uniformly, stirred at a speed of 150 r / min and a temperature of 25°C, and epichlorohydrin was added. The temperature was raised to 70°C, and the reaction was carried out for 5 hours. Sodium hydroxide solution was added and the reaction was carried out for 3 hours to obtain Intermediate 1; Step A2: Intermediate 1, ZnCl2 solution, and dimethyl sulfoxide were mixed uniformly, stirred at a speed of 120 r / min and a temperature of 20°C, and diethanolamine was added, and the reaction was carried out for 2 hours to obtain Intermediate 2. Intermediate 2 and acetonitrile were mixed uniformly, stirred at a speed of 110 r / min and a temperature of 60°C, and benzyl chloride and bromoethane were added, and the reaction was carried out for 3 hours to obtain Intermediate 3; Step A3: Intermediate 3, acrylic acid and dimethylformamide were mixed uniformly, stirred at a speed of 200 r / min and a temperature of 20°C, and perfluorobutyl ammonium sulfonate and p-hydroxyanisole were added. After stirring for 10 minutes, the temperature was raised to 80°C and the reaction was carried out for 2 hours. The temperature was then raised to 90°C and the reaction was carried out for 2 hours to obtain a modified monomer.

[0024] The amount ratio of tridecafluorooctanol, epichlorohydrin and sodium hydroxide solution in step A1 is 10mmol:10mmol:25mL, the amount of boron trifluoride ether is 3% of the mass of tridecafluorooctanol, and the mass fraction of sodium hydroxide solution is 25%.

[0025] In step A2, the molar ratio of the epoxy group on intermediate 1 to the secondary amine on diethanolamine is 1:1, the mass fraction of the ZnCl2 solution is 5%, the amount of ZnCl2 solution used is 3% of the mass of diethanolamine, and the molar ratio of intermediate 2, acetonitrile, benzyl chloride and ethyl bromide is 1:1.5:1.5:1.

[0026] The molar ratio of the hydroxyl group on the intermediate 3 and the carboxyl group on the acrylic acid in step A3 is 1:1, the amount of perfluorobutyl ammonium sulfonate used is 3% by mass of the acrylic acid, and the amount of p-hydroxyanisole used is 1% by mass of the acrylic acid.

[0027] The modified filler is prepared by the following steps: Step B1: Hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, and aqueous ammonia were uniformly mixed, and γ-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate were added under stirring at a speed of 200 r / min, a temperature of 20° C., and a pH of 7. The temperature was raised to 55° C. and the reaction was carried out for 4 hours. The temperature was then raised to 80° C. and nano-alumina was added. The mixture was stirred for 10 minutes and aged for 10 hours to obtain pretreated silica. Step B2: dispersing carbon black in ethanol, stirring at a speed of 200 r / min, a temperature of 60° C., and a pH value of 4, and adding deionized water and 3-aminopropyltriethoxysilane to react for 8 hours to obtain pretreated carbon black; Step B3: Mix the pretreated silica, ZnCl2 solution and dimethyl sulfoxide evenly, stir and add pretreated carbon black at a speed of 120 r / min and a temperature of 20°C, and react for 2 hours to obtain a composite filler. Mix the composite filler, acrylic acid and ethanol evenly, stir and add concentrated sulfuric acid at a speed of 300 r / min and a temperature of 80°C, and react for 2 hours to obtain a modified filler.

[0028] The amount ratio of hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, ammonia water and tetraethyl orthosilicate in step B1 is 0.35g:100mL:60mL:2mL:1.80g, the amount of γ-glycidyloxypropyltrimethoxysilane is 1% of the mass of tetraethyl orthosilicate, and the amount of nano-alumina is 20% of the mass of tetraethyl orthosilicate.

[0029] The amount of 3-aminopropyltriethoxysilane used in step B2 is 5% of the mass of carbon black.

[0030] The amount ratio of the pretreated silica, pretreated carbon black and ZnCl2 solution in step B3 is 2.5g:1.7g:10mL, the mass fraction of the ZnCl2 solution is 5%, the amount ratio of the composite filler, acrylic acid and concentrated sulfuric acid is 6.5g:10mL:2mL, and the mass fraction of the concentrated sulfuric acid is 95%.

[0031] Example 2, a method for preparing an antistatic coating for a running board, specifically comprising the following steps: Step S1: uniformly mixing the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, modified filler, and deionized water, stirring at a speed of 160 r / min and a temperature of 27° C., adding potassium persulfate, and reacting for 4 hours, then raising the temperature to 100° C. and continuing the reaction for 1.5 hours to prepare a composite emulsion; Step S2: Weigh the following raw materials in parts by weight: 110 parts of composite emulsion, 15 parts of dispersant, 7 parts of defoaming agent, 13 parts of stabilizer, 35 parts of zinc oxide, 15 parts of ultrafine aluminum silicate, 35 parts of titanium dioxide and 45 parts of deionized water, mix the raw materials evenly, and prepare an antistatic coating.

[0032] The weight ratio of the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, potassium persulfate, deionized water and modified filler in step S1 is 110:190:120:60:2:60:70.

[0033] The dispersant described in step S2 is a mixture of ACUMER 9300, OROTAN 1124 and Dispes Ultra PA 4560 in a mass ratio of 1:1.4:1.3, the defoamer is BYK-024, the stabilizer is a mixture of Tinuvin 292 and Tinuvin 123 in a mass ratio of 1:1.2, the ultrafine aluminum silicate is an aluminum silicate powder with an average particle size of ≤1.5μm and a whiteness of ≥97%, and the titanium dioxide is a mixture of PA101, R-960, SR-237 and R706 in a mass ratio of 1:1.3:1.4:1.2.

[0034] The modified monomer is prepared by the following steps: Step A1: Tridecafluorooctanol, boron trifluoride etherate, and acetone were mixed uniformly, stirred at a speed of 170 r / min and a temperature of 27°C, and epichlorohydrin was added. The temperature was raised to 72°C, and the reaction was carried out for 6 hours. Sodium hydroxide solution was added and the reaction was carried out for 4 hours to obtain Intermediate 1; Step A2: Intermediate 1, ZnCl2 solution, and dimethyl sulfoxide were mixed uniformly, stirred at a speed of 130 r / min and a temperature of 22°C, and diethanolamine was added, and the reaction was carried out for 2.5 hours to obtain Intermediate 2. Intermediate 2 and acetonitrile were mixed uniformly, stirred at a speed of 120 r / min and a temperature of 65°C, and benzyl chloride and ethyl bromide were added, and the reaction was carried out for 3.5 hours to obtain Intermediate 3; Step A3: Intermediate 3, acrylic acid and dimethylformamide were mixed uniformly, stirred at a speed of 250 r / min and a temperature of 22°C, and perfluorobutyl ammonium sulfonate and p-hydroxyanisole were added. After stirring for 10 minutes, the temperature was raised to 80°C and the reaction was carried out for 2.5 hours. The temperature was then raised to 90°C and the reaction was carried out for 2.5 hours to obtain a modified monomer.

[0035] The amount ratio of tridecafluorooctanol, epichlorohydrin and sodium hydroxide solution in step A1 is 10mmol:10mmol:25mL, the amount of boron trifluoride ether is 4% of the mass of tridecafluorooctanol, and the mass fraction of sodium hydroxide solution is 25%.

[0036] In step A2, the molar ratio of the epoxy group on intermediate 1 to the secondary amine on diethanolamine is 1:1, the mass fraction of the ZnCl2 solution is 7%, the amount of ZnCl2 solution used is 4% of the mass of diethanolamine, and the molar ratio of intermediate 2, acetonitrile, benzyl chloride and ethyl bromide is 1:1.5:1.5:1.

[0037] The molar ratio of the hydroxyl group on the intermediate 3 and the carboxyl group on the acrylic acid in step A3 is 1:1, the amount of perfluorobutyl ammonium sulfonate used is 4% by mass of the acrylic acid, and the amount of p-hydroxyanisole used is 1% by mass of the acrylic acid.

[0038] The modified filler is prepared by the following steps: Step B1: Hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, and aqueous ammonia were uniformly mixed, and γ-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate were added under stirring at a speed of 250 r / min, a temperature of 22° C., and a pH of 7. The temperature was raised to 60° C. and the reaction was carried out for 5 hours. The temperature was then raised to 85° C. and nano-alumina was added. The mixture was stirred for 15 minutes and aged for 13 hours to obtain pretreated silica. Step B2: dispersing carbon black in ethanol, stirring, adding deionized water and 3-aminopropyltriethoxysilane at a speed of 250 r / min, a temperature of 70° C., and a pH of 4, and reacting for 9 hours to obtain pretreated carbon black; Step B3: Mix the pretreated silica, ZnCl2 solution and dimethyl sulfoxide evenly, stir and add pretreated carbon black at a speed of 30 r / min and a temperature of 22°C, and react for 2.5 hours to obtain a composite filler. Mix the composite filler, acrylic acid and ethanol evenly, stir and add concentrated sulfuric acid at a speed of 400 r / min and a temperature of 85°C, and react for 2.5 hours to obtain a modified filler.

[0039] The amount ratio of hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, ammonia water and tetraethyl orthosilicate in step B1 is 0.35g:100mL:60mL:2mL:1.80g, the amount of γ-glycidyloxypropyltrimethoxysilane is 3% of the mass of tetraethyl orthosilicate, and the amount of nano-alumina is 25% of the mass of tetraethyl orthosilicate.

[0040] The amount of 3-aminopropyltriethoxysilane used in step B2 is 6% of the mass of carbon black.

[0041] The amount ratio of the pretreated silica, pretreated carbon black and ZnCl2 solution in step B3 is 2.5g:1.7g:10mL, the mass fraction of the ZnCl2 solution is 7%, the amount ratio of the composite filler, acrylic acid and concentrated sulfuric acid is 6.5g:10mL:2mL, and the mass fraction of the concentrated sulfuric acid is 95%.

[0042] Example 3, a method for preparing an antistatic coating for a running board, specifically comprising the following steps: Step S1: uniformly mixing the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, modified filler, and deionized water, stirring at a speed of 200 r / min and a temperature of 30° C., adding potassium persulfate, and reacting for 4 h, then raising the temperature to 100° C. and continuing the reaction for 2 h to prepare a composite emulsion; Step S2: Weigh the following raw materials in parts by weight: 120 parts of composite emulsion, 20 parts of dispersant, 10 parts of defoaming agent, 15 parts of stabilizer, 40 parts of zinc oxide, 20 parts of ultrafine aluminum silicate, 40 parts of titanium dioxide and 60 parts of deionized water, mix the raw materials evenly, and prepare an antistatic coating.

[0043] The weight ratio of the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, potassium persulfate, deionized water and modified filler in step S1 is 120:200:130:70:3:70:80.

[0044] The dispersant described in step S2 is a mixture of ACUMER 9300, OROTAN 1124 and Dispes Ultra PA 4560 in a mass ratio of 1:1.2:1.4, the defoamer is DC62, the stabilizer is a mixture of Tinuvin 292, Tinuvin 1130 and Tinuvin 123 in a mass ratio of 1:1.4:1.3, the ultrafine aluminum silicate is an aluminum silicate powder with an average particle size of ≤1.5μm and a whiteness of ≥97%, and the titanium dioxide is a mixture of PA101, R-960, SR-237 and R706 in a mass ratio of 1:1.1:1.5:1.4.

[0045] The modified monomer is prepared by the following steps: Step A1: Tridecafluorooctanol, boron trifluoride etherate, and acetone were uniformly mixed, stirred at a speed of 200 r / min and a temperature of 30°C, and epichlorohydrin was added. The temperature was raised to 75°C, and the reaction was carried out for 8 hours. Sodium hydroxide solution was added and the reaction was carried out for 5 hours to obtain Intermediate 1; Step A2: Intermediate 1, ZnCl2 solution, and dimethyl sulfoxide were mixed uniformly, stirred at a speed of 150 r / min and a temperature of 25°C, and diethanolamine was added, and the reaction was carried out for 3 hours to obtain Intermediate 2. Intermediate 2 and acetonitrile were mixed uniformly, stirred at a speed of 130 r / min and a temperature of 70°C, and benzyl chloride and bromoethane were added, and the reaction was carried out for 4 hours to obtain Intermediate 3; Step A3: Intermediate 3, acrylic acid and dimethylformamide were mixed uniformly, stirred at a speed of 300 r / min and a temperature of 25°C, and perfluorobutyl ammonium sulfonate and p-hydroxyanisole were added. After stirring for 10 minutes, the temperature was raised to 80°C and the reaction was carried out for 3 hours. The temperature was then raised to 90°C and the reaction was carried out for 3 hours to obtain a modified monomer.

[0046] The amount ratio of tridecafluorooctanol, epichlorohydrin and sodium hydroxide solution in step A1 is 10mmol:10mmol:25mL, the amount of boron trifluoride ether is 5% of the mass of tridecafluorooctanol, and the mass fraction of sodium hydroxide solution is 25%.

[0047] In step A2, the molar ratio of the epoxy group on intermediate 1 to the secondary amine on diethanolamine is 1:1, the mass fraction of the ZnCl2 solution is 10%, the amount of ZnCl2 solution used is 5% of the mass of diethanolamine, and the molar ratio of intermediate 2, acetonitrile, benzyl chloride and ethyl bromide is 1:1.5:1.5:1.

[0048] The molar ratio of the hydroxyl group on the intermediate 3 and the carboxyl group on the acrylic acid in step A3 is 1:1, the amount of perfluorobutyl ammonium sulfonate used is 5% by mass of the acrylic acid, and the amount of p-hydroxyanisole used is 1% by mass of the acrylic acid.

[0049] The modified filler is prepared by the following steps: Step B1: Hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, and aqueous ammonia were uniformly mixed, stirred at a speed of 250 r / min, a temperature of 25° C., and a pH of 8, and γ-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate were added. The temperature was raised to 65° C. and the reaction was carried out for 6 hours. The temperature was then raised to 90° C. and nano-alumina was added. The mixture was stirred for 20 minutes and aged for 15 hours to obtain pretreated silica. Step B2: dispersing carbon black in ethanol, stirring, adding deionized water and 3-aminopropyltriethoxysilane at a speed of 300 r / min, a temperature of 80° C., and a pH of 5, and reacting for 10 hours to obtain pretreated carbon black; Step B3: Mix the pretreated silica, ZnCl2 solution and dimethyl sulfoxide evenly, stir and add pretreated carbon black at a speed of 150 r / min and a temperature of 25°C, and react for 3 hours to obtain a composite filler. Mix the composite filler, acrylic acid and ethanol at a speed of 500 r / min and a temperature of 90°C, stir and add concentrated sulfuric acid, and react for 3 hours to obtain a modified filler.

[0050] The amount ratio of hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, ammonia water and tetraethyl orthosilicate in step B1 is 0.35g:100mL:60mL:2mL:1.80g, the amount of γ-glycidyloxypropyltrimethoxysilane is 5% of the mass of tetraethyl orthosilicate, and the amount of nano-alumina is 35% of the mass of tetraethyl orthosilicate.

[0051] The amount of 3-aminopropyltriethoxysilane used in step B2 is 10% of the mass of carbon black.

[0052] The amount ratio of the pretreated silica, pretreated carbon black and ZnCl2 solution in step B3 is 2.5g:1.7g:10mL, the mass fraction of the ZnCl2 solution is 10%, the amount ratio of the composite filler, acrylic acid and concentrated sulfuric acid is 6.5g:10mL:2mL, and the mass fraction of the concentrated sulfuric acid is 95%.

[0053] Comparative Example 1: Compared with Example 1, this comparative example does not add nano-alumina, and the remaining steps are the same.

[0054] Comparative Example 2: Compared with Example 1, this comparative example uses carbon black instead of pretreated carbon black, and the other steps are the same.

[0055] Comparative Example 3: Compared with Example 1, this comparative example uses octanol to replace tridecafluorooctanol, and the remaining steps are the same.

[0056] The antistatic coatings prepared in Examples 1-3 and Comparative Examples 1-3 were tested for abrasion resistance according to GB / T 23988-2009. The test results are shown in Table 2. The sample coating thickness was 45 μm, and standard quartz sand was used as the abrasive. The particle size requirements are shown in Table 1. The sand flow rate was controlled at 90 mL / s.

[0057] The antistatic coatings prepared in Examples 1-3 and Comparative Examples 1-3 were tested for perspiration corrosion resistance according to GB / T30648.2-2015. The test results are shown in Table 2. The coating thickness of the sample was 45 μm. The substrate was a 0.8 mm thick steel plate (150 mm x 50 mm) meeting the requirements of GB / T9271. The cut edges were sealed with aluminum foil. The samples were completely immersed in a 0.9% sodium chloride solution for 5 days.

[0058] Table 1

[0059] Table 2

[0060] Table 2 shows that the antistatic coatings prepared in Examples 1-3 have a wear resistance of 4.08-4.18 L / μm, and no significant change in the coating films after immersion in a 0.9% sodium chloride solution for 5 days, indicating that the present invention has excellent wear resistance and sweat corrosion resistance.

[0061] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing an antistatic coating for a running board, characterized in that: The specific steps include: Step S1: mixing and stirring the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, modified filler and deionized water, and adding potassium persulfate to react to prepare a composite emulsion; Step S2: Weigh the following raw materials in parts by weight: 100-120 parts of a composite emulsion, 10-20 parts of a dispersant, 5-10 parts of a defoaming agent, 10-15 parts of a stabilizer, 30-40 parts of zinc oxide, 10-20 parts of ultrafine aluminum silicate, 30-40 parts of titanium dioxide, and 40-60 parts of deionized water, and mix the raw materials uniformly to prepare an antistatic coating; The weight ratio of the modified monomer, methyl acrylate, methyl methacrylate, glycidyl methacrylate, potassium persulfate, deionized water and modified filler in step S1 is 100-120:180-200:110-130:50-70:1-3:55-70:60-80.

2. The method for preparing the antistatic coating for a running board according to claim 1, characterized in that: The modified monomer is prepared by the following steps: Step A1: Tridecafluorooctanol, boron trifluoride etherate, and acetone were mixed and epichlorohydrin was added. After heating to react, sodium hydroxide solution was added and the reaction was continued to obtain Intermediate 1. Step A2: Intermediate 1, ZnCl2 solution and dimethyl sulfoxide are mixed and stirred, and diethanolamine is added to react to obtain Intermediate 2. Intermediate 2 and acetonitrile are mixed and stirred, and benzyl chloride and ethyl bromide are added to react to obtain Intermediate 3; Step A3: The intermediate 3, acrylic acid and dimethylformamide are mixed and stirred, and perfluorobutyl ammonium sulfonate and p-hydroxyanisole are added to react to obtain a modified monomer.

3. The method for preparing the antistatic coating for a running board according to claim 2, characterized in that: The amount ratio of tridecafluorooctanol, epichlorohydrin and sodium hydroxide solution in step A1 is 10mmol:10mmol:25mL, the amount of boron trifluoride ether is 3-5% of the mass of tridecafluorooctanol, and the mass fraction of sodium hydroxide solution is 25%.

4. The method for preparing the antistatic coating for a running board according to claim 2, characterized in that: In step A2, the molar ratio of the epoxy group on intermediate 1 to the secondary amine on diethanolamine is 1:1, the mass fraction of the ZnCl2 solution is 5-10%, the amount of ZnCl2 solution used is 3-5% of the mass of diethanolamine, and the molar ratio of intermediate 2, acetonitrile, benzyl chloride and ethyl bromide is 1:1.5:1.5:

1.

5. The method for preparing the antistatic coating for a running board according to claim 2, characterized in that: The molar ratio of the hydroxyl group on the intermediate 3 and the carboxyl group on the acrylic acid in step A3 is 1:1, the amount of perfluorobutyl ammonium sulfonate used is 3-5% by mass of the acrylic acid, and the amount of p-hydroxyanisole used is 1% by mass of the acrylic acid.

6. The method for preparing the antistatic coating for a running board according to claim 1, characterized in that: The modified filler is prepared by the following steps: Step B1: Cetyltrimethylammonium bromide, deionized water, anhydrous ethanol, and aqueous ammonia are mixed and stirred, and γ-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate are added to react, the temperature is increased, nano-alumina is added, and the mixture is stirred and aged to obtain pretreated silica; Step B2: dispersing carbon black in ethanol, stirring, and adding deionized water and 3-aminopropyltriethoxysilane to react to prepare pretreated carbon black; Step B3: pretreated silica, ZnCl2 solution and dimethyl sulfoxide are mixed and stirred, and pretreated carbon black is added to react to obtain a composite filler; the composite filler, ethanol and acrylic acid are mixed and stirred, and concentrated sulfuric acid is added to react to obtain a modified filler.

7. The method for preparing the antistatic coating for a running board according to claim 6, characterized in that: The amount ratio of hexadecyltrimethylammonium bromide, deionized water, anhydrous ethanol, ammonia water and tetraethyl orthosilicate in step B1 is 0.35g:100mL:60mL:2mL:1.80g, the amount of γ-glycidyloxypropyltrimethoxysilane is 1-5% of the mass of tetraethyl orthosilicate, and the amount of nano-alumina is 20-35% of the mass of tetraethyl orthosilicate.

8. The method for preparing the antistatic coating for a running board according to claim 6, characterized in that: The amount of 3-aminopropyltriethoxysilane used in step B2 is 5-10% of the mass of carbon black.

9. The method for preparing the antistatic coating for a running board according to claim 6, characterized in that: In step B3, the amount ratio of pretreated silica, pretreated carbon black and ZnCl2 solution is 2.5g:1.7g:10mL, the mass fraction of ZnCl2 solution is 5-10%, the amount ratio of composite filler, acrylic acid and concentrated sulfuric acid is 6.5g:10mL:2mL, and the mass fraction of concentrated sulfuric acid is 95%. 10.An antistatic coating for a running board, characterized by: Prepared according to any one of claims 1 to 9.

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