A water-based coating material, preparation method and application

Abstract

The present application discloses a water-based coating material, a preparation method and an application, and relates to the technical field of polymer materials, including polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water, wherein the weight ratio of polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water is 4.7-5.2:0.3-0.35:0.6-0.7:0.8-1.5; the water-based polyurethane is water-based polyurethane dispersant-80 or synthetic polyurethane, and the synthetic polyurethane contains sulfonate-modified organosilicon polyol. The present application has the effect of significantly improving the cleaning effect of glass and effectively extending the service life.

Description

Technical Field

[0001] The present application relates to the technical field of polymer materials, and in particular to a water-based coating material, a preparation method and an application thereof. Background Art

[0002] Rain, sleet and snow often present visual problems for drivers of vehicles. Although the mechanical motion of a wiper sweeping across the windshield is partially effective in removing water and snow from the windshield, as is a mechanical rubber wiper. Conventional wipers, whether made of carbon-based or silicone rubber, operate only partially effectively in clearing water and snow from the windshield. The movement of the wiper across the windshield leaves behind a thin film of water that impairs vision to some extent and promotes the adhesion of additional liquid water or snow to the windshield. In addition, as the wiper degrades through exposure to the environment, the uniformity of the wiper contact with the windshield deteriorates. In addition, the debris that typically adheres to the windshield forms areas where the wiper is free from the windshield surface, resulting in streaks and water droplets that obscure vision.

[0003] The Chinese patent with the announcement number CN106738981B discloses a processing technology for coating silicone wiper strips, and the processing technology for coating silicone wiper strips includes the following steps: 1) rolling and mixing, rolling and mixing high tear-resistant silicone, low temperature resistant silicone and vulcanizing agent according to a certain proportion, so that the high tear-resistant silicone, low temperature resistant silicone and vulcanizing agent are completely mixed; the high tear-resistant silicone: low temperature resistant silicone: vulcanizing agent is equal to 0.8-1.5:0.8-1.5:0.01-0 .03; 2) Compression molding: put the mixed silicone material into the molding machine mold according to the required amount of the pressed product for compression molding; 3) Spraying: physically clean the surface of the semi-finished product pressed in step 2), increase the coating adhesion coefficient, and evenly spray the surface with Teflon water-based paint; when increasing the coating adhesion coefficient, a plasma device is used to treat the surface of the semi-finished product; the Teflon water-based paint is made of polytetrafluoroethylene, emulsified silicone oil, molybdenum disulfide, distilled water and water-based wax in a ratio of 4.7-5.2: 0.3-0.35: 0.6-0.7: 0.8-1.5: 0.33-0.4; 4) Curing: put the product after the surface spraying treatment into an oven and bake it at a temperature of 80-160°C for 10-15 minutes to cure the Teflon water-based paint on the surface of the product; 5) Finished product: the product after curing in step 4) is physically cut according to specifications and sizes to finally form a finished product of coated silicone wiper strips.

[0004] The coated silicone wiper strips prepared by the processing technology of the coated silicone wiper strips mainly adopt Teflon water-based coating composed of polytetrafluoroethylene, emulsified silicone oil, molybdenum disulfide, distilled water and water-based wax to form a layer of silicone grease coating film on the glass surface, thereby improving the clarity; but at the same time, the use of the coated silicone wiper strips will cause it to be worn out due to friction, and thus affect the cleaning effect and service life of the glass, which needs to be improved. Summary of the invention

[0005] In view of this, the first purpose of the present application is to provide a water-based coating material to achieve the purpose of improving the cleaning ability and durability of the glass surface. The specific scheme is as follows:

[0006] A water-based coating material comprises polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water, wherein the weight ratio of polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water is 4.7-5.2:0.3-0.35:0.6-0.7:0.8-1.5; the water-based polyurethane is water-based polyurethane dispersant-80 or synthetic polyurethane, and the synthetic polyurethane contains sulfonate-modified silicone polyol.

[0007] Preferably, the synthetic polyurethane comprises 52-60 parts by weight of polytetramethylene ether glycol, 35-65 parts of diisocyanate, 12-20 parts of neutralizer, 180-220 parts of deionized water, 3-5 parts of chain extender, 0.5-1 parts of catalyst and 15-22 parts of sulfonate modified silicone polyol.

[0008] Preferably: the sulfonate-modified silicone polyol is prepared by first mixing a double-terminal alcohol hydroxyl long-chain alkyl silicone oil and a sulfonate in xylene as a solvent, adding 0.2-0.8wt% of zinc oxide as a catalyst, and then controlling the temperature to 175°C for reaction for 30 minutes, heating to 220°C for reaction for 1.5 hours, and cooling to 190°C for constant temperature reaction in an inert atmosphere, and then extracting the solvent and controlling the temperature to be lowered to room temperature to obtain the polyol.

[0009] Preferably, the sulfonate is sodium 5-sulfoisophthalate.

[0010] Preferably: the preparation of the synthetic polyurethane comprises the steps of ① uniformly mixing polytetramethylene ether glycol and diisocyanate, adding a catalyst and heating and stirring to obtain a prepolymer; ② adding a chain extender to the prepolymer, controlling the temperature to 25-40°C, adding sulfonate-modified silicone polyol to continue the reaction after the reaction is complete, and obtaining a synthetic polyurethane blank after the reaction is complete; and ③ adding a neutralizer to the synthetic polyurethane blank to adjust the pH to 8-9, then adding deionized water and stirring to obtain an emulsified synthetic polyurethane.

[0011] Preferably: the neutralizing agent is triethylamine, N-methyldiethanolamine or dimethylethanolamine; the chain extender is ethylenediamine; and the catalyst is an organic tin catalyst.

[0012] The second object of the present invention is to provide a method for preparing a water-based coating material, which is used to prepare the water-based coating material as described above, and is characterized in that: it includes ultrasonically stirring and uniformly mixing polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water in a weight ratio of 4.7-5.2:0.3-0.35:0.6-0.7:0.8-1.5, and controlling the stirring temperature to 25-40°C.

[0013] The third object of the present invention is to provide an application of a water-based coating material, comprising applying the water-based coating material as described above to a coating of a water-based coating wiper.

[0014] Preferably: the water-based coated wiper blade includes a rubber strip and a bracket, the bracket is detachably connected and fixed to the car and is used to detachably connect the rubber strip, the rubber strip includes a silicone body and a coating attached to the outside of the silicone body; the silicone body is formed by mixing and vulcanizing silicone and a vulcanizing agent.

[0015] Preferably: the silica gel comprises high tear-resistant silica gel and low-temperature resistant silica gel in a mass ratio of 1:0.5-2, and the added amount of the vulcanizer is 1.5-3.2wt% of the silica gel body; the mixing comprises the steps of ① rolling and mixing the high tear-resistant silica gel, the low-temperature resistant silica gel and the vulcanizer, and then putting them into an extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; step ② putting the preliminary rubber strip into an oven for secondary vulcanization, controlling the oven temperature to 100-200°C, and obtaining a rubber strip body; the preparation method of the coating comprises the steps of ① cleaning and drying the surface of the rubber strip body; step ② evenly spraying the water-based material on the surface of the rubber strip body; step ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature to 80-160°C, and the time to 10-15min.

[0016] Through the above scheme, it can be known that the present application provides a water-based coating material, a preparation method and an application. The water-based coating material is combined with water-based polyurethane, polytetrafluoroethylene, molybdenum disulfide and deionization, and the sulfonate-modified silicone polyol obtained by sulfonate-modified double-terminal alcohol hydroxyl long-chain alkyl silicone oil is added to the water-based polyurethane to improve the flexibility of the coating so that it can produce corresponding deformation as the silicone body deforms, and at the same time, it has impact resistance, so that it can effectively adhere to the silicone body to achieve the effect of extending the use effect and improving the cleaning ability of the glass surface. The preparation method of the water-based coating material has the effect of low difficulty and effective control of production costs; the application of the water-based coating material has the effect of significantly improving the reliability of the use of the water-based coated wiper, thereby extending the service life and achieving a durable effect. DETAILED DESCRIPTION

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

[0018] It should be mentioned that the organic tin catalyst used in the examples of the present application is commercially available dibutyltin dilaurate, stannous octoate or dibutyltin diacetate, which will not be described in detail here. The double-terminal alcohol hydroxyl long-chain alkyl silicone oil used in the examples of the present application was purchased from Henan Lavoisier Chemical Products Co., Ltd., with an average molecular weight of 3550 and a hydroxyl value of 25.0.

[0019] The following will specifically describe the water-based coating material, preparation method and application of the present application.

[0020] A water-based coating material includes polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water, wherein the weight ratio of polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water is 4.7-5.2:0.3-0.35:0.6-0.7:0.8-1.5. The water-based polyurethane is water-based polyurethane dispersant-80 or synthetic polyurethane. The synthetic polyurethane contains sulfonate-modified silicone polyol. It should be noted that the water-based polyurethane is water-based polyurethane dispersant-80 or synthetic polyurethane. It is found through testing that the coating obtained by adding synthetic polyurethane has a 10-20% improvement in flexibility and a significantly improved durability compared to the coating obtained by adding water-based polyurethane dispersant-80. At the same time, the coating obtained by adding water-based polyurethane dispersant-80 has a 20-30% improvement in flexibility and a significantly improved durability compared to the coating film layer on the finished product of the coated silicone wiper strip obtained with the announcement number CN106738981B.

[0021] The synthetic polyurethane in the embodiment of the present application is composed of 52-60 parts by weight of polytetramethylene ether glycol, 35-65 parts of diisocyanate, 12-20 parts of neutralizer, 180-220 parts of deionized water, 3-5 parts of chain extender, 0.5-1 parts of catalyst and 15-22 parts of sulfonate modified silicone polyol. The sulfonate modified silicone polyol is first mixed with dihydroxy long-chain alkyl silicone oil and sulfonate in xylene as a solvent, and 0.2-0.8wt% of zinc oxide is added as a catalyst, and then the temperature is controlled to react at 175°C for 30 minutes, heated to 220°C for 1.5 hours, and cooled to 190°C for constant temperature reaction in an inert atmosphere, and then the solvent is extracted and the temperature is controlled to be lowered to room temperature to obtain.

[0022] In the embodiment of the present application, the sulfonate is sodium 5-sulfoisophthalate.

[0023] The preparation of synthetic polyurethane comprises the steps of ① uniformly mixing polytetramethylene ether glycol and diisocyanate, adding a catalyst, heating and stirring, and obtaining a prepolymer; ② adding a chain extender into the prepolymer, controlling the temperature to be 25-40 DEG C, adding sulfonate-modified organic silicon polyol to continue the reaction after the reaction is complete, and obtaining a synthetic polyurethane blank after the reaction is complete; and ③ adding a neutralizer into the synthetic polyurethane blank to adjust the pH to 8-9, adding deionized water, stirring, and obtaining an emulsified synthetic polyurethane.

[0024] In the embodiment of the present application, the neutralizing agent is triethylamine, N-methyldiethanolamine or dimethylethanolamine, the chain extender is ethylenediamine, and the catalyst is an organic tin catalyst.

[0025] The second object of the present invention is to provide a method for preparing a water-based coating material, which is used to prepare the water-based coating material as described above, comprising ultrasonically stirring and uniformly mixing polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water in a weight ratio of 4.7-5.2:0.3-0.35:0.6-0.7:0.8-1.5, and controlling the stirring temperature to 25-40°C.

[0026] An application of a water-based coating material, comprising applying the water-based coating material as described above to the coating of a water-based coated wiper. The water-based coated wiper comprises a rubber strip and a bracket. The bracket is detachably connected and fixed to the car, and is used to detachably connect the rubber strip. The rubber strip comprises a silicone body and a coating attached to the outside of the silicone body. The coating is sprayed on the outside of the silicone body by the water-based coating material and dried and cured. Spraying can be carried out by a spray gun or plasma, which will not be described here. The bracket comprises plastic parts and hardware. The plastic parts are obtained by drying, injection molding and stripping the injection molding material. The hardware is obtained by punching and molding the SPCC coil and conveying the spraying.

[0027] The silicone body is formed by mixing and vulcanizing silicone and a vulcanizing agent. The silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:0.5-2, and the amount of the vulcanizing agent added is 1.5-3.2wt% of the silicone body. The mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, low-temperature resistant silicone and the vulcanizing agent, and then putting them into the extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; the step of ② putting the preliminary rubber strip into an oven for secondary vulcanization, controlling the oven temperature to 100-200°C, and obtaining the rubber strip body. The preparation method of the coating includes the steps of ① cleaning and drying the surface of the rubber strip body; the step of ② spraying the water-based material evenly on the surface of the rubber strip body; the step of ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature to 80-160°C, and the time to 10-15min.

[0028] Embodiment 1

[0029] A water-based coating material includes polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water. The weight ratio of polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water is 4.7:0.3:0.6:0.8. The water-based polyurethane is water-based polyurethane dispersant-80. It should be noted that, according to tests, the coating obtained by adding water-based polyurethane dispersant-80 has a coating film layer with 20-30% higher flexibility and significantly improved durability than the coating film layer on the finished product of the coated silicone wiper strip obtained with announcement number CN106738981B.

[0030] The second object of the present invention is to provide a method for preparing a water-based coating material, which is used to prepare the water-based coating material as described above, comprising ultrasonically stirring and mixing polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water in a weight ratio of 4.7:0.3:0.6:0.8, and controlling the stirring temperature to 25°C.

[0031] An application of a water-based coating material, comprising applying the water-based coating material as described above to the coating of a water-based coated wiper. The water-based coated wiper comprises a rubber strip and a bracket. The bracket is detachably connected and fixed to the car, and is used to detachably connect the rubber strip. The rubber strip comprises a silicone body and a coating attached to the outside of the silicone body. The coating is sprayed on the outside of the silicone body by the water-based coating material and dried and cured. Spraying can be carried out by a spray gun or plasma, which will not be described here. The bracket comprises plastic parts and hardware. The plastic parts are obtained by drying, injection molding and stripping the injection molding material. The hardware is obtained by punching and molding the SPCC coil and conveying the spraying.

[0032] The silicone body is formed by mixing and vulcanizing silicone and a vulcanizing agent. The silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:0.5, and the amount of the vulcanizing agent added is 1.5wt% of the silicone body. The mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, low-temperature resistant silicone and the vulcanizing agent, and then putting them into the extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; the step of ② putting the preliminary rubber strip into an oven for secondary vulcanization, controlling the oven temperature to 100°C, and obtaining the rubber strip body. The preparation method of the coating includes the steps of ① cleaning and drying the surface of the rubber strip body; the step of ② spraying the water-based material evenly on the surface of the rubber strip body; the step of ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature to 80°C, and the time to 15min.

[0033] Embodiment 2

[0034] A water-based coating material includes polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water, wherein the weight ratio of polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water is 4.9:0.32:0.65:1.2. The water-based polyurethane is a synthetic polyurethane. The synthetic polyurethane contains sulfonate-modified silicone polyol. It should be noted that, according to tests, the coating obtained by adding synthetic polyurethane has a 10-20% increase in flexibility and a significantly improved durability compared to the coating obtained by adding water-based polyurethane dispersant-80. At the same time, the coating obtained by adding water-based polyurethane dispersant-80 has a 20-30% increase in flexibility and a significantly improved durability compared to the coating film layer on the finished coated silicone wiper strip obtained with announcement number CN106738981B.

[0035] The synthetic polyurethane in Example 2 of the present application is composed of 56 parts by weight of polytetramethylene ether glycol, 50 parts of diisocyanate, 16 parts of N-methyldiethanolamine, 200 parts of deionized water, 4 parts of ethylenediamine, 0.7 parts of dibutyltin dilaurate and 18 parts of sodium 5-sulfonate isophthalate modified silicone polyol. Among them, the sulfonate modified silicone polyol is first mixed with double-terminal alcohol hydroxyl long-chain alkyl silicone oil and sodium 5-sulfonate isophthalate in xylene as a solvent, adding 0.5wt% of zinc oxide as a catalyst, and then controlling the temperature to 175°C in an inert atmosphere for 30 minutes, heating to 220°C for 1.5 hours, and cooling to 190°C for constant temperature reaction, and then extracting the solvent and controlling the temperature to room temperature to obtain.

[0036] The preparation of synthetic polyurethane comprises the steps of ① uniformly mixing polytetramethylene ether glycol and diisocyanate, adding dibutyltin dilaurate, heating and stirring, and obtaining a prepolymer; ② adding ethylenediamine into the prepolymer, controlling the temperature to be 32 DEG C, adding sulfonate-modified organosilicon polyol to continue the reaction after the reaction is complete, and obtaining a synthetic polyurethane blank after the reaction is complete; and ③ adding N-methyldiethanolamine into the synthetic polyurethane blank to adjust the pH to 9, adding deionized water and stirring, and obtaining an emulsified synthetic polyurethane.

[0037] The second object of the present invention is to provide a method for preparing a water-based coating material, which is used to prepare the water-based coating material as described above, comprising ultrasonically stirring and uniformly mixing polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water in a weight ratio of 4.9:0.32:0.65:1.2, and controlling the stirring temperature to 30°C.

[0038] An application of a water-based coating material, comprising applying the water-based coating material as described above to the coating of a water-based coated wiper. The water-based coated wiper comprises a rubber strip and a bracket. The bracket is detachably connected and fixed to the car, and is used to detachably connect the rubber strip. The rubber strip comprises a silicone body and a coating attached to the outside of the silicone body. The coating is sprayed on the outside of the silicone body by the water-based coating material and dried and cured. Spraying can be carried out by a spray gun or plasma, which will not be described here. The bracket comprises plastic parts and hardware. The plastic parts are obtained by drying, injection molding and stripping the injection molding material. The hardware is obtained by punching and molding the SPCC coil and conveying the spraying.

[0039] Among them, the silicone body is formed by mixing and vulcanizing silicone and a vulcanizing agent. The silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:1, and the amount of the vulcanizing agent added is 2.3wt% of the silicone body. The mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, low-temperature resistant silicone and the vulcanizing agent, and then putting them into the extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; step ② putting the preliminary rubber strip into an oven for secondary vulcanization, controlling the oven temperature to 150°C, and obtaining the rubber strip body. The preparation method of the coating includes the steps of ① cleaning and drying the surface of the rubber strip body; step ② spraying the water-based material evenly on the surface of the rubber strip body; step ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature to 120°C, and the time to 12 minutes.

[0040] Embodiment 3

[0041] A water-based coating material includes polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water, wherein the weight ratio of polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water is 5.2:0.35:0.7:1.5. The water-based polyurethane is a synthetic polyurethane. The synthetic polyurethane contains sulfonate-modified silicone polyol. It should be noted that, according to tests, the coating obtained by adding synthetic polyurethane has a 10-20% increase in flexibility and a significantly improved durability compared to the coating obtained by adding water-based polyurethane dispersant-80. At the same time, the coating obtained by adding water-based polyurethane dispersant-80 has a 20-30% increase in flexibility and a significantly improved durability compared to the coating film layer on the finished coated silicone wiper strip obtained with announcement number CN106738981B.

[0042] The synthetic polyurethane in Example 3 of the present application is composed of 60 parts by weight of polytetramethylene ether glycol, 65 parts of diisocyanate, 20 parts of dimethylethanolamine, 220 parts of deionized water, 5 parts of ethylenediamine, 1 part of dibutyltin dilaurate and 22 parts of sodium 5-sulfonate isophthalate modified silicone polyol. Among them, the sulfonate modified silicone polyol is first mixed with double-terminal alcohol hydroxyl long-chain alkyl silicone oil and sodium 5-sulfonate isophthalate in xylene as a solvent, adding 0.8wt% of zinc oxide as a catalyst, and then controlling the temperature to 175°C in an inert atmosphere for 30 minutes, heating to 220°C for 1.5 hours, and cooling to 190°C for constant temperature reaction, and then extracting the solvent and controlling the temperature to room temperature to obtain. The preparation of synthetic polyurethane comprises the steps of ① uniformly mixing polytetramethylene ether glycol and diisocyanate, adding dibutyltin dilaurate, heating and stirring, and obtaining a prepolymer; ② adding ethylenediamine into the prepolymer, controlling the temperature to 40 DEG C, adding sulfonate-modified organosilicon polyol to continue the reaction after the reaction is complete, and obtaining a synthetic polyurethane blank after the reaction is complete; and ③ adding dimethylethanolamine into the synthetic polyurethane blank to adjust the pH to 8, adding deionized water and stirring, and obtaining an emulsified synthetic polyurethane.

[0043] The second object of the present invention is to provide a method for preparing a water-based coating material, which is used to prepare the water-based coating material as described above, comprising ultrasonically stirring and uniformly mixing polytetrafluoroethylene, water-based polyurethane, molybdenum disulfide and deionized water in a weight ratio of 5.2:0.35:0.7:1.5, and controlling the stirring temperature to 40°C.

[0044] An application of a water-based coating material, comprising applying the water-based coating material as described above to the coating of a water-based coated wiper. The water-based coated wiper comprises a rubber strip and a bracket. The bracket is detachably connected and fixed to the car, and is used to detachably connect the rubber strip. The rubber strip comprises a silicone body and a coating attached to the outside of the silicone body. The coating is sprayed on the outside of the silicone body by the water-based coating material and dried and cured. Spraying can be carried out by a spray gun or plasma, which will not be described here. The bracket comprises plastic parts and hardware. The plastic parts are obtained by drying, injection molding and stripping the injection molding material. The hardware is obtained by punching and molding the SPCC coil and conveying the spraying.

[0045] The silicone body is formed by mixing and vulcanizing silicone and a vulcanizing agent. The silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:2, and the amount of the vulcanizing agent added is 3.2wt% of the silicone body. The mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, low-temperature resistant silicone and the vulcanizing agent, and then putting them into an extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; and step ② putting the preliminary rubber strip into an oven for secondary vulcanization, controlling the oven temperature to 160°C, and obtaining the rubber strip body.

[0046] Embodiment 4

[0047] The difference between Example 4 and Example 1 is that the water-based polyurethane in Example 4 is synthetic polyurethane.

[0048] The synthetic polyurethane in Example 4 of the present application is composed of 52 parts by weight of polytetramethylene ether glycol, 35 parts of diisocyanate, 12 parts of triethylamine, 180 parts of deionized water, 3 parts of ethylenediamine, 0.5 parts of dibutyltin dilaurate and 15 parts of sodium 5-sulfonate isophthalate modified silicone polyol. Among them, the sulfonate modified silicone polyol is first mixed with double-terminal alcohol hydroxyl long-chain alkyl silicone oil and sodium 5-sulfonate isophthalate in xylene as a solvent, adding 0.2wt% of zinc oxide as a catalyst, and then controlling the temperature to 175°C in an inert atmosphere for 30 minutes, heating to 220°C for 1.5 hours, and cooling to 190°C for constant temperature reaction, and then extracting the solvent and controlling the temperature to room temperature to obtain.

[0049] The preparation of synthetic polyurethane comprises the steps of ① uniformly mixing polytetramethylene ether glycol and diisocyanate, adding dibutyltin dilaurate, heating and stirring, and obtaining a prepolymer; ② adding ethylenediamine into the prepolymer, controlling the temperature to be 25 DEG C, adding sulfonate-modified organosilicon polyol to continue the reaction after the reaction is complete, and obtaining a synthetic polyurethane blank after the reaction is complete; and ③ adding triethylamine into the synthetic polyurethane blank to adjust the pH to 8.2, adding deionized water and stirring, and obtaining an emulsified synthetic polyurethane.

[0050] Comparative Example 1

[0051] The difference between Comparative Example 1 and Example 2 is that in Comparative Example 1, organosilicon polyol is used instead of sodium 5-sulfonate isophthalic acid modified organosilicon polyol, and the organosilicon polyol is purchased from Jiangxi Haiduo Organosilicon Materials Co., Ltd.

[0052] The difference between Comparative Example 2 and Example 2 is that 6 parts by weight of sulfonate-modified organosilicon polyol are added in Comparative Example 2.

[0053] Performance Testing:

[0054] 1. Friction resistance: tested by friction coefficient;

[0055] 2. Anti-aging: Use 35℃, ultraviolet irradiation (control the ultraviolet index (UVI) to 6) for 2 months, 6 months and 1 year;

[0056] 3. Flexibility: Test tensile strength and tear strength.

[0057] Table 1 Performance test results

[0058]

[0059] As shown in Table 1 above, in the embodiments of the present application, when the coating is obtained by using synthetic polyurethane, its flexibility is improved by 10-20% compared with the coating obtained by using aqueous polyurethane dispersant-80, and the durability is significantly improved. It can achieve a test performance of 1 year in good condition based on anti-aging test. In addition, the organosilicon polyol modified by sodium 5-sulfonate of isophthalic acid used in the embodiments of the present application has the effect of shear thickening gel by introducing hydrogen bonds and forming a network structure, which improves the impact resistance while achieving the purpose of durability, and can form a close fit with the car window glass, so as to efficiently scrape off rain, snow, dust and other debris on the car window glass.

[0060] In summary, the present application provides a water-based coating material, a preparation method and an application. The water-based coating material is prepared by combining water-based polyurethane with polytetrafluoroethylene, molybdenum disulfide and deionization, thereby adding sulfonate-modified silicone polyol obtained by sulfonate-modified double-terminal alcohol hydroxyl long-chain alkyl silicone oil to the water-based polyurethane, so as to improve the flexibility of the coating so as to produce corresponding deformation as the silicone body deforms, and at the same time, have impact resistance, so as to effectively adhere to the silicone body, so as to achieve the effect of extending the use effect and improving the cleaning ability of the glass surface. The preparation method of the water-based coating material has the effect of low difficulty and effective control of production costs; the application of the water-based coating material has the effect of significantly improving the reliability of the use of the water-based coated wiper, thereby extending the service life and achieving a durable effect.

[0061] The "first", "second", "third", "fourth", etc. (if any) referred to in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods or devices.

[0062] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0063] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A water-based coating material, characterized in that: The invention comprises polytetrafluoroethylene, waterborne polyurethane, molybdenum disulfide and deionized water, wherein the weight ratio of the polytetrafluoroethylene, waterborne polyurethane, molybdenum disulfide and deionized water is 4.7-5.2:0.3-0.35:0.6-0.7:0.8-1.5; the waterborne polyurethane is a synthetic polyurethane, and the synthetic polyurethane contains sulfonate-modified organic silicon polyol; the synthetic polyurethane comprises 52-60 parts of polytetramethylene ether glycol, 35-65 parts of diisocyanate, 12-20 parts of neutralizer, 180-220 parts of deionized water, 3-5 parts of chain extender, 0.5-1 part of catalyst and 15-22 parts of sulfonate-modified organic silicon polyol; the sulfonate-modified organic silicon polyol is prepared by first mixing a double-terminal alcohol hydroxyl long-chain alkyl silicone oil and a sulfonate in xylene as a solvent, and then adding a sulfonate in a weight percentage; The method comprises the following steps:

1. mixing polytetramethylene ether glycol and diisocyanate uniformly, adding a catalyst, heating and stirring, and obtaining a prepolymer; 2. adding a chain extender to the prepolymer, controlling the temperature to 25-40°C, adding a sulfonate-modified organosilicon polyol to continue the reaction after the reaction is complete, and obtaining a synthetic polyurethane blank after the reaction is complete; 3. adding a neutralizer to the synthetic polyurethane blank to adjust the pH to 8-9, adding deionized water and stirring, and obtaining an emulsified synthetic polyurethane.

2. The water-based coating material according to claim 1, characterized in that: The neutralizing agent is triethylamine, N-methyldiethanolamine or dimethylethanolamine; the chain extender is ethylenediamine; and the catalyst is an organic tin catalyst.

3. A method for preparing a water-based coating material, for preparing the water-based coating material according to any one of claims 1 to 2, characterized in that: The method comprises the steps of uniformly mixing polytetrafluoroethylene, waterborne polyurethane, molybdenum disulfide and deionized water by ultrasonic stirring in a weight ratio of 4.7-5.2:0.3-0.35:0.6-0.7:0.8-1.5, and controlling the stirring temperature to be 25-40 DEG C.

4. An application of a water-based coating material, characterized in that: The method comprises applying the water-based coating material as described in any one of claims 1 to 2 to the coating of a water-based coating wiper.

5. The use of a water-based coating material according to claim 4, characterized in that: The water-based coated wiper blade includes a rubber strip and a bracket, the bracket is detachably connected and fixed to the car and is used to detachably connect the rubber strip, the rubber strip includes a silicone body and a coating attached to the outside of the silicone body; the silicone body is formed by mixing and vulcanizing silicone and a vulcanizing agent.

6. The use of a water-based coating material according to claim 5, characterized in that: The silica gel comprises high tear-resistant silica gel and low-temperature resistant silica gel in a mass ratio of 1:0.5-2, and the added amount of the vulcanizer is 1.5-3.2wt% of the silica gel body; the mixing comprises the steps of ① rolling and mixing the high tear-resistant silica gel, the low-temperature resistant silica gel and the vulcanizer, and then putting them into an extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; step ② putting the preliminary rubber strip into an oven for secondary vulcanization, controlling the oven temperature to 100-200°C, and obtaining the rubber strip body; the preparation method of the coating comprises the steps of ① cleaning and drying the surface of the rubber strip body; step ② uniformly spraying the water-based material on the surface of the rubber strip body; step ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature to 80-160°C, and the time to be 10-15min.

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