Water-based coated windscreen wiper and manufacturing method thereof

Abstract

The invention discloses a water-based film-coated windscreen wiper and a manufacturing method thereof, and relates to the technical field of automobile parts, the water-based film-coated windscreen wiper comprises an adhesive tape and a support, the support is detachably connected and fixed with an automobile and is used for being detachably connected with the adhesive tape, and the water-based film-coated windscreen wiper is characterized in that the adhesive tape comprises a silica gel body and a coating attached to the outer side of the silica gel body; the silica gel body is formed by mixing and vulcanizing silica gel and a vulcanizing agent; the coating is formed by spraying a water-based material on the outer side of the silica gel body and drying and curing the water-based material; 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 addition amount of the vulcanizing agent is 1.5-3.2 wt% of the silica gel body; the high-tear-resistance silica gel is prepared from the following components in parts by weight: 90 to 95 parts of raw rubber A, 5 to 8 parts of raw rubber B, 28 to 42 parts of fumed silica, 0.1 to 0.5 part of composite peroxide and 1.2 to 3.5 parts of a structure inhibitor. The friction coefficient of the silica gel body is reduced, and meanwhile, the structural strength and stability are improved, so that the effects of resisting aging and prolonging the service life are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts, and in particular to a water-based coated wiper and a manufacturing method 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] In the coated silicone wiper blades prepared by the processing technology of the coated silicone wiper strips, the composition of high tear-resistant silicone, low-temperature resistant silicone and vulcanizer is difficult to meet the growing performance requirements, especially in the hot summer, there is still the problem of softening and slight deformation of the strips caused by local high temperature, which in turn affects the wiper during use and produces noise, affecting the driving experience, and it is difficult to effectively clean the glass surface, 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 coated wiper blade to achieve the purpose of extending the service life and improving the use effect. The specific scheme is as follows: A water-based coated wiper blade comprises a rubber strip and a bracket, wherein the bracket is detachably connected and fixed to a car and is used for detachably connecting the rubber strip, wherein the rubber strip comprises a silicone body and a coating attached to the outer side of the silicone body; the silicone body is formed by mixing and vulcanizing silicone and a vulcanizing agent; the coating is sprayed on the outer side of the silicone body by a water-based material and then dried and cured; the silicone comprises high-tear-resistant silicone and low-temperature-resistant silicone in a mass ratio of 1:0.5-2, and the added amount of the vulcanizing agent is 1.5-3.2wt% of the silicone body; the high-tear-resistant silicone comprises 90-95 parts by weight of raw rubber A, 5-8 parts by weight of raw rubber B, 28-42 parts by weight of fumed silica, 0.1-0.5 parts by weight of a composite peroxide, and 1.2-3.5 parts by weight of a structural inhibitor.

[0006] Preferably, the raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.32-0.48%; the raw rubber B is polymethylsiloxane containing siloxane groups, mercapto groups and / or sulfonic acid groups as active groups.

[0007] Preferably: the molecular formula of the polymethylsiloxane is as follows: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)R1-O] n -[Si(CH3)R2-O] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20; R1 and R2 are independent siloxane groups, mercapto groups and / or sulfonic acid groups.

[0008] Preferably: the preparation of the composite peroxide comprises the steps of ① adding diisopropylbenzene peroxide and chitosan in a mass ratio of 0.45-0.65:1 into a solvent in which the ratio of ethanol to acetic acid is 1:1, stirring at 65-75°C for 10 minutes and then removing the solvent to obtain a solid precipitate; and ② adding the solid precipitate and ferrosoferric oxide in a mass ratio of 1:0.01-0.05 into deionized water, stirring evenly at 25°C and then removing the water to obtain a composite peroxide.

[0009] Preferably, the stirring is carried out by ultrasonic stirring.

[0010] Preferably, the structural inhibitor is one of hydroxy silicone oil, hexamethyldisilazane and dimethyldiethoxysilane.

[0011] Preferably: the mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, the 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; and 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.

[0012] Preferably: the method for preparing the coating comprises the steps of ① cleaning and drying the surface of the rubber strip body; ② spraying the water-based material evenly on the surface of the rubber strip body; and 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 for 10-15 minutes.

[0013] Preferably, the bracket includes plastic parts and hardware parts, the plastic parts are obtained by baking, injection molding and stripping injection molding materials; the hardware parts are obtained by punching and molding SPCC coils and conveying and spraying.

[0014] A second object of the present invention is to provide a method for manufacturing a water-based coated wiper blade, which is used to prepare the water-based coated wiper blade as described above, and comprises the following steps: Step 1, the injection molding material is baked, injection molded and stripped to obtain plastic parts, and the SPCC coil is punched and molded by a punch press, and then sprayed to obtain hardware parts, and finally the injection molding material and the hardware parts are combined to form a bracket; Step 2, mixing silica gel and a vulcanizing agent to vulcanize and form a silica gel body, spraying a water-based material on the surface of the silica gel body, and curing to form a rubber strip with a coating; Step 3: Insert the rubber strip into the bracket and fix it.

[0015] It can be seen from the above scheme that the present application provides a water-based coated wiper and a method for manufacturing the same. The water-based coated wiper obtains a high tear-resistant silicone rubber prepared from raw rubber A, raw rubber B, fumed silica, composite peroxide and structural inhibitor in the process of preparing the silicone body. While significantly improving the tensile strength and elongation at break, it also has the effects of high hardness and effective mixing with low-temperature resistant silicone rubber to form a silicone body with high structural strength and stability, thereby achieving the purpose of extending the service life and improving the use effect. The method for manufacturing the water-based coated wiper has the effects of low difficulty and easy operation and implementation, thereby significantly reducing the cost of the water-based coated wiper manufactured by the method for manufacturing the water-based coated wiper, and is suitable for large-scale mass production. DETAILED DESCRIPTION

[0016] 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.

[0017] It should be mentioned that the low temperature resistant silicone rubber used in the examples of the present application is methyl vinyl phenyl silicone rubber purchased from Anhui Aiyota Silicone Oil Co., Ltd. The vulcanizing agent is DCP.

[0018] The water-based coated wiper blade and its manufacturing method of the present application will be described in detail below.

[0019] A water-based coated wiper blade includes a rubber strip and a bracket. The bracket is used to be detachably connected and fixed to a car, and is used to detachably connect the rubber strip. The bracket is manufactured according to the car model and will not be described in detail here. In the embodiment of the present application, the rubber strip used includes 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 a water-based material and dried and solidified. The coating has the effect of making the water-based coated wiper blade have water-repelling properties, so that after the silicone wiper rubber strip rubs with the glass for a period of time, a layer of silicone grease coating film will be formed on the surface of the glass, so that when rain falls on the car glass, it will gather into water droplets, and then the windward impact generated by the driving of the car will carry away the water droplets, and at the same time, it will make the driver's front line of sight clearer when driving on rainy days.

[0020] In order to optimize the silicone body, improve the structural strength and stability of the silicone body, and effectively extend the service life of the silicone body, the silicone and vulcanizing agent are mixed and vulcanized to form the embodiment of the present application. The temperature is controlled to be 145-155°C during the mixing and vulcanization process until the vulcanization reaction is complete. Among them, the silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:0.5-2. The amount of vulcanizing agent added is 1.5-3.2wt% of the silicone body. In order to significantly improve the tensile strength and elongation at break, while having high hardness and effectively mixing with low-temperature resistant silicone to form a silicone body with high structural strength and stability, the high tear-resistant silicone in the embodiment of the present application includes 90-95 parts of raw rubber A, 5-8 parts of raw rubber B, 28-42 parts of fumed silica, 0.1-0.5 parts of composite peroxide and 1.2-3.5 parts of structural inhibitor.

[0021] Wherein, the raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.32-0.48%. The raw rubber B is polymethylsiloxane containing siloxane groups, mercapto groups and / or sulfonic acid groups as active groups. It should be mentioned that the molecular formula of polymethylsiloxane is as follows: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)R1-O] n -[Si(CH3)R2-O] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20; R1 and R2 are independent siloxane groups, mercapto groups and / or sulfonic acid groups.

[0022] At the same time, in order to achieve effective catalytic cross-linking, the preparation of the composite peroxide includes: step ① adding diisopropylbenzene peroxide and chitosan in a mass ratio of 0.45-0.65:1 into a solvent in which the ratio of ethanol to acetic acid is 1:1, stirring at 65-75°C for 10 minutes, and then removing the solvent to obtain a solid precipitate; step ② adding the solid precipitate and ferrosoferric oxide in a mass ratio of 1:0.01-0.05 into deionized water, stirring evenly at 25°C, and then removing the water to obtain the composite peroxide.

[0023] The stirring adopts ultrasonic stirring to fully mix the components in the form of ultrasonic oscillation stirring to form a composite peroxide with a uniform structure.

[0024] In the embodiment of the present application, the structural inhibitor is one of hydroxy silicone oil, hexamethyldisilazane and dimethyldiethoxysilane. The structural inhibitor is commercially available and will not be described in detail here. In the embodiment of the present application, hexamethyldisilazane is used as the structural inhibitor. Of course, other structural inhibitors with the same function can also be used, which will not be described in detail here.

[0025] In the embodiment of the present application, in the preparation of the silicone body, the mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, the 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; and step ② putting the preliminary rubber strip into the oven for secondary vulcanization, controlling the oven temperature to 150°C, and obtaining the rubber strip body.

[0026] It should be noted that the method for preparing the coating includes the steps of ① cleaning and drying the surface of the rubber strip body; ② spraying the water-based material evenly on the surface of the rubber strip body; and ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the temperature of the oven to be 80-160°C for 10-15 minutes. The bracket includes plastic parts and hardware. The plastic parts are obtained by baking, injection molding and stripping the injection molding materials. The hardware parts are obtained by punching and molding the SPCC coils and conveying and spraying. In view of the fact that the materials of the plastic parts and hardware are commercially available and the preparation process is the existing conventional process, it will not be repeated here.

[0027] A method for manufacturing a water-based coated wiper blade, for preparing the water-based coated wiper blade as described above, comprises the following steps: Step 1, the injection molding material is baked, injection molded and stripped to obtain plastic parts, and the SPCC coil is punched and molded by a punch press, and then sprayed to obtain hardware parts, and finally the injection molding material and the hardware parts are combined to form a bracket; Step 2, mixing silica gel and a vulcanizing agent to vulcanize and form a silica gel body, spraying a water-based material on the surface of the silica gel body, and curing to form a rubber strip with a coating; Step 3: Insert the rubber strip into the bracket and fix it.

[0028] Embodiment 1 A water-based coated wiper blade includes a rubber strip and a bracket. The bracket is used to be detachably connected and fixed to a car, and is used to detachably connect the rubber strip. The bracket is manufactured according to the car model and will not be described in detail here. In the embodiment of the present application, the rubber strip used includes 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 a water-based material and dried and solidified. The coating has the effect of making the water-based coated wiper blade have water-repelling properties, so that after the silicone wiper rubber strip rubs with the glass for a period of time, a layer of silicone grease coating film will be formed on the surface of the glass, so that when rain falls on the car glass, it will gather into water droplets, and then the windward impact generated by the driving of the car will carry away the water droplets, and at the same time, it will make the driver's front line of sight clearer when driving on rainy days.

[0029] In order to optimize the silicone body, improve the structural strength and stability of the silicone body, and effectively extend the service life of the silicone body, the silicone and vulcanizing agent are mixed and vulcanized to form the embodiment of the present application. The temperature is controlled to be 145°C during the mixing and vulcanization process until the vulcanization reaction is complete. Among them, the silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:0.5. The amount of vulcanizing agent added is 1.5wt% of the silicone body. In order to significantly improve the tensile strength and elongation at break, while having high hardness and effectively mixing with low-temperature resistant silicone to form a silicone body with high structural strength and stability, the high tear-resistant silicone in the embodiment of the present application includes 90 parts by weight of raw rubber A, 5 parts of raw rubber B, 28 parts of fumed silica, 0.1 parts of composite peroxide and 1.2 parts of hexamethyldisilazane.

[0030] Among them, the raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.35%. The raw rubber B is polymethylsiloxane containing siloxane groups as active groups. It should be mentioned that the molecular formula of polymethylsiloxane is as follows: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)R1-O] n -[Si(CH3)R2-O] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20; R1 and R2 are both siloxane groups.

[0031] Polymethylsiloxane is added by dropping hydrogen-containing silicone oil into a solution containing isopropyl alcohol and chloroplatinic acid, and the active material with active groups is first mixed in the solution, and then the hydrogen-containing silicone oil is added. The molecular formula of hydrogen-containing silicone oil is as follows: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)HO]n -[Si(CH3)HO] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, and n is a constant of 1-20. The active material is vinyldimethylethoxysilane. The vinyl group of vinyldimethylethoxysilane undergoes addition reaction with SI-H.

[0032] At the same time, in order to achieve effective catalytic cross-linking, the preparation of the composite peroxide used includes: step ① adding diisopropylbenzene peroxide and chitosan in a mass ratio of 0.45:1 into a solvent in which the ratio of ethanol to acetic acid is 1:1, and removing the solvent after ultrasonic stirring at 65°C for 10 minutes to obtain a solid precipitate; step ② adding the solid precipitate and ferrosoferric oxide in a mass ratio of 1:0.01 into deionized water, and removing the water after ultrasonic stirring at 25°C to obtain the composite peroxide.

[0033] In the embodiment of the present application, in the preparation of the silicone body, the mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, the 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; and step ② putting the preliminary rubber strip into the oven for secondary vulcanization, controlling the oven temperature to 150°C, and obtaining the rubber strip body.

[0034] It should be noted that the method for preparing the coating includes the steps of ① cleaning and drying the surface of the rubber strip body; ② spraying the water-based material evenly on the surface of the rubber strip body; and ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the temperature of the oven to 80°C for 15 minutes. The bracket includes plastic parts and hardware. The plastic parts are obtained by baking, injection molding and stripping the injection molding materials. The hardware parts are obtained by punching and molding the SPCC coils and conveying and spraying. In view of the fact that the materials of the plastic parts and hardware are commercially available and the preparation process is the existing conventional process, it will not be repeated here.

[0035] A method for manufacturing a water-based coated wiper blade, for preparing the water-based coated wiper blade as described above, comprises the following steps: Step 1, the injection molding material is baked, injection molded and stripped to obtain plastic parts, and the SPCC coil is punched and molded by a punch press, and then sprayed to obtain hardware parts, and finally the injection molding material and the hardware parts are combined to form a bracket; Step 2, mixing silica gel and a vulcanizing agent to vulcanize and form a silica gel body, spraying a water-based material on the surface of the silica gel body, and curing to form a rubber strip with a coating; Step 3: Insert the rubber strip into the bracket and fix it.

[0036] Embodiment 2 A water-based coated wiper blade includes a rubber strip and a bracket. The bracket is used to be detachably connected and fixed to a car, and is used to detachably connect the rubber strip. The bracket is manufactured according to the car model and will not be described in detail here. In the embodiment of the present application, the rubber strip used includes 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 a water-based material and dried and solidified. The coating has the effect of making the water-based coated wiper blade have water-repelling properties, so that after the silicone wiper rubber strip rubs with the glass for a period of time, a layer of silicone grease coating film will be formed on the surface of the glass, so that when rain falls on the car glass, it will gather into water droplets, and then the windward impact generated by the driving of the car will carry away the water droplets, and at the same time, it will make the driver's front line of sight clearer when driving on rainy days.

[0037] In order to optimize the silicone body, improve the structural strength and stability of the silicone body, and effectively extend the service life of the silicone body, the silicone and vulcanizing agent are mixed and vulcanized to form the embodiment of the present application. The temperature is controlled to be 150°C during the mixing and vulcanization process until the vulcanization reaction is complete. Among them, the silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:1. The amount of vulcanizing agent added is 2.2wt% of the silicone body. In order to significantly improve the tensile strength and elongation at break, while having high hardness and effectively mixing with low-temperature resistant silicone to form a silicone body with high structural strength and stability, the high tear-resistant silicone in the embodiment of the present application includes 93 parts by weight of raw rubber A, 6 parts of raw rubber B, 35 parts of fumed silica, 0.3 parts of composite peroxide and 2 parts of hexamethyldisilazane.

[0038] Among them, the raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.4%. The raw rubber B is polymethylsiloxane containing siloxane and sulfonic acid groups as active groups. It should be mentioned that the molecular formula of polymethylsiloxane is as follows: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)R1-O] n -[Si(CH3)R2-O] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20; R1 and R2 are independent siloxane groups and sulfonic acid groups, respectively.

[0039] Polymethylsiloxane is added by dropping hydrogen-containing silicone oil into a solution containing isopropyl alcohol and chloroplatinic acid, and the active material with active groups is first mixed in the solution, and then the hydrogen-containing silicone oil is added. The molecular formula of hydrogen-containing silicone oil is as follows: (CH3)3Si-O-[Si(CH3)2-O] m-[Si(CH3)HO] n -[Si(CH3)HO] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20; and the active materials are vinyl dimethyl ethoxy silane and vinyl sulfonic acid.

[0040] At the same time, in order to achieve effective catalytic cross-linking, the preparation of the composite peroxide used includes: step ① adding diisopropylbenzene peroxide and chitosan in a mass ratio of 0.55:1 into a solvent in which the ratio of ethanol to acetic acid is 1:1, and removing the solvent after ultrasonic stirring at 70°C for 10 minutes to obtain a solid precipitate; step ② adding the solid precipitate and ferrosoferric oxide in a mass ratio of 1:0.03 into deionized water, and removing the water after ultrasonic stirring at 25°C to obtain the composite peroxide.

[0041] In the embodiment of the present application, in the preparation of the silicone body, the mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, the 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; and step ② putting the preliminary rubber strip into the oven for secondary vulcanization, controlling the oven temperature to 150°C, and obtaining the rubber strip body.

[0042] It should be noted that the method for preparing the coating includes the steps of ① cleaning and drying the surface of the rubber strip body; ② spraying the water-based material evenly on the surface of the rubber strip body; and ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the temperature of the oven to be 100°C, and the time to be 13 minutes. The bracket includes plastic parts and hardware. The plastic parts are obtained by baking, injection molding and stripping the injection molding materials. The hardware parts are obtained by punching and molding the SPCC coils, and conveying and spraying. In view of the fact that the materials of the plastic parts and hardware are commercially available, the preparation process is the existing conventional process, which will not be described here.

[0043] A method for manufacturing a water-based coated wiper blade, for preparing the water-based coated wiper blade as described above, comprises the following steps: Step 1, the injection molding material is baked, injection molded and stripped to obtain plastic parts, and the SPCC coil is punched and molded by a punch press, and then sprayed to obtain hardware parts, and finally the injection molding material and the hardware parts are combined to form a bracket; Step 2, mixing silica gel and a vulcanizing agent to vulcanize and form a silica gel body, spraying a water-based material on the surface of the silica gel body, and curing to form a rubber strip with a coating; Step 3: Insert the rubber strip into the bracket and fix it.

[0044] Embodiment 3 A water-based coated wiper blade includes a rubber strip and a bracket. The bracket is used to be detachably connected and fixed to a car, and is used to detachably connect the rubber strip. The bracket is manufactured according to the car model and will not be described in detail here. In the embodiment of the present application, the rubber strip used includes 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 a water-based material and dried and solidified. The coating has the effect of making the water-based coated wiper blade have water-repelling properties, so that after the silicone wiper rubber strip rubs with the glass for a period of time, a layer of silicone grease coating film will be formed on the surface of the glass, so that when rain falls on the car glass, it will gather into water droplets, and then the windward impact generated by the driving of the car will carry away the water droplets, and at the same time, it will make the driver's front line of sight clearer when driving on rainy days.

[0045] In order to optimize the silicone body, improve the structural strength and stability of the silicone body, and effectively extend the service life of the silicone body, the silicone and vulcanizing agent are mixed and vulcanized to form the embodiment of the present application. The temperature is controlled to be 155°C during the mixing and vulcanization process until the vulcanization reaction is complete. Among them, the silicone includes high tear-resistant silicone and low-temperature resistant silicone in a mass ratio of 1:2. The amount of vulcanizer added is 3.2wt% of the silicone body. In order to significantly improve the tensile strength and elongation at break, while having high hardness and effectively mixing with low-temperature resistant silicone to form a silicone body with high structural strength and stability, the high tear-resistant silicone in the embodiment of the present application includes 95 parts of raw rubber A, 8 parts of raw rubber B, 42 parts of fumed silica, 0.5 parts of composite peroxide and 3.5 parts of hexamethyldisilazane by weight.

[0046] Among them, the raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.45%. The raw rubber B is polymethylsiloxane containing mercapto groups as active groups. It should be mentioned that the molecular formula of polymethylsiloxane is as follows: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)R1-O] n -[Si(CH3)R2-O] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20; R1 and R2 are mercapto groups.

[0047] Polymethylsiloxane is added by dropping hydrogen-containing silicone oil into a solution containing isopropyl alcohol and chloroplatinic acid, and the active material with active groups is first mixed in the solution, and then the hydrogen-containing silicone oil is added. The molecular formula of hydrogen-containing silicone oil is as follows: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)HO] n-[Si(CH3)HO] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20, and the active material is 2-ethylenethiopyrimidine.

[0048] At the same time, in order to achieve effective catalytic cross-linking, the preparation of the composite peroxide used includes: step ① adding diisopropylbenzene peroxide and chitosan in a mass ratio of 0.65:1 into a solvent in which the ratio of ethanol to acetic acid is 1:1, and removing the solvent after ultrasonic stirring at 75°C for 10 minutes to obtain a solid precipitate; step ② adding the solid precipitate and ferrosoferric oxide in a mass ratio of 1:0.05 into deionized water, and removing the water after ultrasonic stirring at 25°C to obtain the composite peroxide.

[0049] In the embodiment of the present application, in the preparation of the silicone body, the mixing includes the steps of ① rolling and mixing the high tear-resistant silicone, the 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; and step ② putting the preliminary rubber strip into the oven for secondary vulcanization, controlling the oven temperature to 150°C, and obtaining the rubber strip body.

[0050] It should be noted that the method for preparing the coating includes the steps of ① cleaning and drying the surface of the rubber strip body; ② spraying the water-based material evenly on the surface of the rubber strip body; and ③ placing the rubber strip body with the water-based material on the surface into an oven for baking, controlling the temperature of the oven to be 160°C for 10 minutes. The bracket includes plastic parts and hardware. The plastic parts are obtained by baking, injection molding and stripping the injection molding materials. The hardware parts are obtained by punching and molding the SPCC coils and conveying and spraying. In view of the fact that the materials of the plastic parts and hardware are commercially available and the preparation process is the existing conventional process, it will not be repeated here.

[0051] A method for manufacturing a water-based coated wiper blade, for preparing the water-based coated wiper blade as described above, comprises the following steps: Step 1, the injection molding material is baked, injection molded and stripped to obtain plastic parts, and the SPCC coil is punched and molded by a punch press, and then sprayed to obtain hardware parts, and finally the injection molding material and the hardware parts are combined to form a bracket; Step 2, mixing silica gel and a vulcanizing agent to vulcanize and form a silica gel body, spraying a water-based material on the surface of the silica gel body, and curing to form a rubber strip with a coating; Step 3: Insert the rubber strip into the bracket and fix it.

[0052] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the raw rubber A in Comparative Example 1 is methyl-added vinyl silicone rubber, and the molar content of vinyl is 0.15%.

[0053] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, ferrosoferric oxide is used instead of the composite peroxide.

[0054] test: Performance tests were conducted on Examples 1 to 3 of the present application and Comparative Examples 1 to 2, and the results of the performance tests are shown in Table 1 below.

[0055] Among them, performance tests were conducted on Examples 1 to 3 and Comparative Examples 1 to 2.

[0056] 1. Tear strength: According to GB / T 529-2008 "Determination of tear strength of vulcanized rubber or thermoplastic rubber"; 2. Tensile strength: implemented in accordance with GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"; 3. Elongation at break: implemented in accordance with GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"; 4. Friction coefficient - Friction coefficient test between glass: implemented using silicone rubber sliding friction wear / rolling friction coefficient tester; 5. Anti-aging test: Place at 35℃, UV irradiation (control the UV index (UVI) to 6) for 2-month and 6-month, and check the status.

[0057] Table 1 Performance test results

[0058] As can be seen from Table 1 above, the water-based coated wiper blade prepared by the present invention has high tensile strength, and based on the high tensile strength, it has the effects of high elongation at break and tear strength, and through its strength and toughness, it forms a low friction coefficient with the glass and can effectively wipe off stains and rainwater on the glass surface, achieving high cleaning and anti-aging capabilities.

[0059] It can be seen from the above scheme that the present application provides a water-based coated wiper and a method for manufacturing the same. The water-based coated wiper obtains a high tear-resistant silicone rubber prepared from raw rubber A, raw rubber B, fumed silica, composite peroxide and structural inhibitor in the process of preparing the silicone body. While significantly improving the tensile strength and elongation at break, it also has the effects of high hardness and effective mixing with low-temperature resistant silicone rubber to form a silicone body with high structural strength and stability, thereby achieving the purpose of extending the service life and improving the use effect. The method for manufacturing the water-based coated wiper has the effects of low difficulty and easy operation and implementation, thereby significantly reducing the cost of the water-based coated wiper manufactured by the method for manufacturing the water-based coated wiper, and is suitable for large-scale mass production.

[0060] 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.

[0061] 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.

[0062] 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 coated wiper blade, comprising a rubber strip and a bracket, wherein the bracket is detachably connected and fixed to the vehicle and is used to detachably connect the rubber strip, characterized in that: 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; the coating is sprayed on the outside of the silicone body by an aqueous material and dried and cured; the silicone includes high-tear-resistant silicone and low-temperature-resistant silicone in a mass ratio of 1:0.5-2, and the added amount of the vulcanizing agent is 1.5-3.2wt% of the silicone body; the high-tear-resistant silicone includes 90-95 parts of raw rubber A, 5-8 parts of raw rubber B, 28-42 parts of fumed silica, 0.1-0.5 parts of composite peroxide and 1.2-3.5 parts of structural inhibitor in parts by weight.

2. The water-based coated wiper blade according to claim 1, characterized in that: The raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.32-0.48%; the raw rubber B is polymethylsiloxane containing siloxane groups, mercapto groups and / or sulfonic acid groups as active groups.

3. The water-based coated wiper blade according to claim 2, characterized in that: The molecular formula of the polymethylsiloxane is shown below: (CH3)3Si-O-[Si(CH3)2-O] m -[Si(CH3)R1-O] n -[Si(CH3)R2-O] 20-n -O-Si(CH3) 3； Wherein, m is a constant of 50-3000, n is a constant of 1-20; R1 and R2 are independent siloxane groups, mercapto groups and / or sulfonic acid groups.

4. The water-based coated wiper blade according to claim 1, characterized in that: The preparation of the composite peroxide comprises the steps of: ① adding dicumyl peroxide and chitosan in a mass ratio of 0.45-0.65:1 into a solvent in which the ratio of ethanol to acetic acid is 1:1, stirring at 65-75°C for 10 minutes, and then removing the solvent to obtain a solid precipitate; and ② adding the solid precipitate and ferrosoferric oxide in a mass ratio of 1:0.01-0.05 into deionized water, stirring evenly at 25°C, and then removing the water to obtain the composite peroxide.

5. The water-based coated wiper blade according to claim 4, characterized in that: The stirring is carried out by ultrasonic stirring.

6. The water-based coated wiper blade according to claim 1, characterized in that: The structural inhibitor is one of hydroxy silicone oil, hexamethyldisilazane and dimethyldiethoxysilane.

7. The water-based coated wiper blade according to claim 1, characterized in that: The mixing comprises the steps of ① rolling and mixing high tear-resistant silicone, low-temperature resistant silicone and a vulcanizing agent, and then putting them into an extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; and 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.

8. The water-based coated wiper blade according to claim 7, characterized in that: The coating preparation method comprises the steps of ① cleaning and drying the surface of the rubber strip body; ② spraying the water-based material evenly on the surface of the rubber strip body; and 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 for 10-15 minutes.

9. The water-based coated wiper blade according to claim 1, characterized in that: The bracket comprises plastic parts and hardware parts. The plastic parts are obtained by baking, injection molding and stripping injection molding materials; the hardware parts are obtained by punching and molding SPCC coils and conveying and spraying.

10. A method for manufacturing a water-based coated wiper blade, for preparing the water-based coated wiper blade according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, the injection molding material is baked, injection molded and stripped to obtain plastic parts, and the SPCC coil is punched and molded by a punch press, and then sprayed to obtain hardware parts, and finally the injection molding material and the hardware parts are combined to form a bracket; Step 2, mixing silica gel and a vulcanizing agent to vulcanize and form a silica gel body, spraying a water-based material on the surface of the silica gel body, and curing to form a rubber strip with a coating; Step 3: Insert the rubber strip into the bracket and fix it.

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