An aqueous coated windshield wiper and its manufacturing method

Abstract

The present application discloses an aqueous coating wiper and a manufacturing method thereof, relating to the technical field of automotive parts, including a rubber strip and a bracket. The bracket is detachably connected and fixed to an automobile and is used for detachably connecting the rubber strip. It is characterized in that: the rubber strip includes 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 an aqueous material on the outer side of the silica gel body and drying and curing; the silica gel includes 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-resistant silica gel includes 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 compound peroxide, and 1.2-3.5 parts by weight of a structure inhibitor. The present application achieves the effects of anti-aging and extended service life by reducing the friction coefficient of the silica gel body while improving the structural strength and stability.

Description

Technical Field

[0001] This application relates to the technical field of automotive parts, and particularly relates to an aqueous coating wiper and a manufacturing method thereof. Background Art

[0002] For vehicle drivers, rain, sleet, and snow often pose visual problems. Although the mechanical movement of the windshield wiper that sweeps across the windshield, like a mechanical rubber wiper, is somewhat effective in removing water and snow from the windshield. Conventional wipers, whether made of carbon-based or silicone rubber, operate only partially effectively in clearing water and snow from the windshield. The wiper leaves a thin film of water as it sweeps across the windshield, which to some extent impairs vision and promotes additional liquid water or snow to adhere to the windshield. In addition, as the wiper degrades by exposure to the environment, the uniformity of contact between the wiper and the windshield deteriorates. Moreover, debris typically adheres to the windshield in areas where there are gaps between the wiper and the windshield surface, resulting in streaks and water droplets that blur vision.

[0003] Chinese Patent with Publication No. CN106738981B discloses a processing technology for a coated silicone wiper strip. The processing technology for the coated silicone wiper strip includes the following steps: 1) Rolling and mixing, rolling and mixing high tear-resistant silicone, low-temperature-resistant silicone, and vulcanizing agent in a certain proportion to completely mix the high tear-resistant silicone, low-temperature-resistant silicone, and vulcanizing agent; the ratio of high tear-resistant silicone: low-temperature-resistant silicone: vulcanizing agent is 0.8 - 1.5: 0.8 - 1.5: 0.01 - 0.03; 2) Compression molding: Put the mixed silicone material into the mold of the molding machine according to the required amount of the molded product for compression molding; 3) Spraying: Physically clean the surface of the semi-finished product formed in step 2) to increase the paint adhesion coefficient, and evenly spray the surface with Teflon aqueous paint; a plasma device is used to treat the surface of the semi-finished product when increasing the paint adhesion coefficient; the Teflon aqueous paint is mixed by polytetrafluoroethylene, emulsified silicone oil, molybdenum disulfide, distilled water, and aqueous 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 surface spraying treatment into an oven and bake it at a temperature of 80 - 160°C for 10 - 15 minutes to cure the Teflon aqueous paint on the product surface; 5) Finished product: Physically cut the product after curing in step 4) according to specifications and dimensions to finally form a finished coated silicone wiper strip.

[0004] In the coated silicone wiper blade prepared by the processing technology of the coated silicone wiper blade, the composition of the high tear-resistant silicone, low-temperature resistant silicone and vulcanizing agent is difficult to meet the increasing performance requirements. Especially in the hot summer, there are still problems such as softening and slight deformation of the rubber strip caused by local high temperature, which will affect the generation of noise during the use of the wiper blade and thus affect the driving experience, and it is difficult to effectively clean the glass surface, so it needs to be improved. Summary of the Invention

[0005] In view of this, the first object of the present application is to provide an aqueous coated wiper blade to achieve the purpose of extending the service life and improving the use effect. The specific scheme is as follows:

[0006] An aqueous coated wiper blade includes a rubber strip and a bracket. The bracket is detachably connected and fixed to the vehicle 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 kneaded and vulcanized from silicone and a vulcanizing agent. The coating is formed by spraying an aqueous material on the outside of the silicone body and drying and curing. The silicone includes high tear-resistant silicone and low-temperature resistant silicone 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 silicone body. The high tear-resistant silicone includes 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 compound peroxide, and 1.2-3.5 parts by weight of a structure inhibitor.

[0007] 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 a polymethylsiloxane containing siloxanyl, mercapto and / or sulfonic acid groups as active groups.

[0008] Preferably: The molecular formula of the polymethylsiloxane is as follows:

[0009] (CH 3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )R 1 -O] n -[Si(CH 3 )R 2 -O] 20-n -O-Si(CH 3 ) 3；

[0010] Wherein, m is a constant from 50 to 3000, n is a constant from 1 to 20; R 1 、R 2They are respectively independent siloxanyl groups, mercapto groups and / or sulfonic acid groups.

[0011] Preferably: The preparation of the composite peroxide includes step ① putting dicumyl peroxide and chitosan into a solvent with a mass ratio of ethanol to acetic acid of 1:1 at a mass ratio of 0.45 - 0.65:1, stirring at 65 - 75 °C for 10 min, and then removing the solvent to obtain a solid precipitate; step ② putting the solid precipitate and iron tetroxide into deionized water at a mass ratio of 1:0.01 - 0.05, stirring evenly at 25 °C, and then removing the moisture to obtain the composite peroxide.

[0012] Preferably: The stirring is carried out by ultrasonic stirring.

[0013] Preferably: The structure inhibitor is one of hydroxyl silicone oil, hexamethyldisilazane and dimethyldiethoxysilane.

[0014] Preferably: The mixing and kneading includes step ① rolling and kneading high tear-resistant silicone rubber, low-temperature resistant silicone rubber and vulcanizing agent, 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 at 150 °C to obtain the rubber strip body.

[0015] Preferably: The preparation method of the coating includes step 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 putting the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature at 80 - 160 °C and the time at 10 - 15 min.

[0016] Preferably: The bracket includes a plastic part and a hardware part. The plastic part is obtained by drying the injection molding material, injection molding and demolding; the hardware part is obtained by punching and forming SPCC coil stock and then spray painting during transmission.

[0017] The second object of the present invention is to provide a manufacturing method of a water-based coated windshield wiper for preparing the water-based coated windshield wiper as described above, including the following steps:

[0018] Step 1: Dry the injection molding material, injection mold and demold to obtain a plastic part, punch and form SPCC coil stock and then spray paint during transmission to obtain a hardware part, and finally combine the injection molding material and the hardware part to form a bracket;

[0019] Step 2: Mix and knead and vulcanize the silicone rubber and the vulcanizing agent to form a silicone rubber body, then spray a water-based material on the surface of the silicone rubber body and cure it to form a rubber strip with a coating;

[0020] Step 3: Insert the rubber strip into the bracket and fix it.

[0021] As can be seen from the above solution, the present application provides an aqueous-coated windshield wiper and a manufacturing method thereof. In the process of preparing the silicone body of the aqueous-coated windshield wiper, the high tear-resistant silicone obtained from raw rubber A, raw rubber B, fumed silica, compound peroxide and structural inhibitor can 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, so as to achieve the purpose of extending the service life and improving the use effect. The manufacturing method of the aqueous-coated windshield wiper has the effects of low difficulty and easy operation and implementation, thus significantly reducing the cost of the aqueous-coated windshield wiper manufactured by the manufacturing method of the aqueous-coated windshield wiper, and is suitable for large-scale production. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0023] It should be mentioned that the low-temperature-resistant silicone used in the embodiments of the present application is methyl vinyl phenyl silicone rubber purchased from Anhui Aiyota Silicone Oil Co., Ltd. The vulcanizing agent is DCP.

[0024] The aqueous-coated windshield wiper and its manufacturing method of the present application will be specifically described below.

[0025] An aqueous-coated windshield wiper includes a rubber strip and a bracket. The bracket is used for detachably connecting and fixing with an automobile and for detachably connecting the rubber strip. The bracket is manufactured according to the vehicle model and will not be elaborated here. In the embodiments of the present application, the rubber strip used includes a silicone body and a coating attached to the outer side of the silicone body. The coating is formed by spraying an aqueous material on the outer side of the silicone body and drying and curing. The coating enables the aqueous-coated windshield wiper to have water-repellent performance, so that after the silicone windshield wiper rubber strip rubs against the glass for a period of time, a silicone grease coating film will be formed on the glass surface. Thus, when rain falls on the vehicle glass, it will gather into water droplets, and then the water droplets will be taken away by the windward impact generated during the driving of the vehicle. At the same time, it will also make the driver's front vision clearer when driving in rainy days.

[0026] In the embodiments of the present application, in order to optimize the silica gel body, improve the structural strength and stability of the silica gel body, and thus effectively extend the service life of the silica gel body, the silica gel and the vulcanizing agent are kneaded and vulcanized and formed. During the kneading and vulcanizing process, the temperature is controlled at 145-155°C until the vulcanization reaction is complete. Among them, the silica gel includes high tear-resistant silica gel and low-temperature-resistant silica gel in a mass ratio of 1:0.5-2. The addition amount of the vulcanizing agent is 1.5-3.2 wt% of the silica gel body. In order to significantly improve the tensile strength and elongation at break while having the effects of high hardness and effectively mixing with the low-temperature-resistant silica gel to form a silica gel body with high structural strength and stability, the high tear-resistant silica gel in the embodiments of the present application includes 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 compound peroxide, and 1.2-3.5 parts by weight of a structure inhibitor.

[0027] Among them, raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.32-0.48%. Raw rubber B is a polymethylsiloxane containing siloxanyl, mercapto and / or sulfonic acid group as active groups. It should be noted that the molecular formula of the polymethylsiloxane is as follows:

[0028] (CH 3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )R 1 -O] n -[Si(CH 3 )R 2 -O] 20-n -O-Si(CH 3 ) 3；

[0029] Among them, m is a constant of 50-3000, n is a constant of 1-20; R 1 、R 2 are independently siloxanyl, mercapto and / or sulfonic acid group respectively.

[0030] Meanwhile, in order to achieve effective catalytic crosslinking, the preparation of the compound peroxide used includes: Step ① Put dicumyl peroxide and chitosan into a solvent with a mass ratio of ethanol to acetic acid of 1:1 at a mass ratio of 0.45-0.65:1, stir at 65-75°C for 10 min, and then remove the solvent to obtain a solid precipitate; Step ② Put the solid precipitate and ferric oxide into deionized water at a mass ratio of 1:0.01-0.05, stir evenly at 25°C, and then remove the water to obtain the compound peroxide.

[0031] Stirring is carried out by ultrasonic stirring to fully mix each component in the form of ultrasonic oscillation stirring, so as to form a composite peroxide with a uniform structure.

[0032] In the embodiment of the present application, the structure inhibitor is one of hydroxyl silicone oil, hexamethyldisilazane and dimethyldiethoxysilane. The structure inhibitor is commercially available and will not be elaborated here. And in the embodiment of the present application, hexamethyldisilazane is used as the structure inhibitor. Of course, other structure inhibitors with the same function can also be used and will not be elaborated here.

[0033] In the embodiment of the present application, in the preparation of the silicone rubber body, the mixing includes step ① rolling and mixing high tear strength silicone rubber, low temperature resistant silicone rubber and vulcanizing agent, 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 at 150 °C to obtain the rubber strip body.

[0034] It should be noted that the preparation method of the coating includes step 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 putting the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature at 80 - 160 °C and the time at 10 - 15 min. The bracket includes a plastic part and a hardware part. The plastic part is obtained by drying the injection molding material, injection molding and demolding. The hardware part is obtained by punching and forming the SPCC coil material and then spray painting during transmission. Since the materials of the plastic part and the hardware part are commercially available and the preparation process is an existing conventional process, it will not be elaborated here.

[0035] A manufacturing method of a water-based coated windshield wiper for preparing the water-based coated windshield wiper as described above includes the following steps:

[0036] Step 1: Dry the injection molding material, injection mold and demold it to obtain a plastic part, punch and form the SPCC coil material and then spray paint during transmission to obtain a hardware part, and finally combine the injection molding material and the hardware part to form a bracket;

[0037] Step 2: Mix and vulcanize the silicone rubber and the vulcanizing agent to form a silicone rubber body, then spray the water-based material on the surface of the silicone rubber body and cure it to form a rubber strip with a coating;

[0038] Step 3: Insert the rubber strip into the bracket and fix it.

[0039] Example 1

[0040] A water-based coated windshield wiper includes a rubber strip and a bracket. The bracket is used for detachably connecting and fixing to an automobile and for detachably connecting the rubber strip. The bracket is manufactured according to vehicle models, which will not be elaborated here. In the embodiment of the present application, the rubber strip adopted includes a silica gel body and a coating attached to the outer side of the silica gel body. The coating is formed by spraying a water-based material on the outer side of the silica gel body and drying and curing it. The coating endows the water-based coated windshield wiper with water repellency, such that after the silica gel windshield wiper rubber strip rubs against the glass for a period of time, a silica gel grease coating film will be formed on the glass surface. Thus, when rain falls on the vehicle glass, it will gather into beads, and then be carried away by the windward impact generated during the driving of the automobile. At the same time, it will also make the driver's forward vision clearer when driving in rainy weather.

[0041] In the embodiment of the present application, in order to optimize the silica gel body, improve the structural strength and stability of the silica gel body, and thus effectively extend the service life of the silica gel body, the silica gel and vulcanizing agent are kneaded and vulcanized. During the kneading and vulcanizing process, the temperature is controlled at 145 °C until the vulcanization reaction is complete. Among them, the silica gel includes high tear-resistant silica gel and low-temperature resistant silica gel in a mass ratio of 1:0.5. The addition amount of the vulcanizing agent is 1.5 wt% of the silica gel body. In order to significantly improve the tensile strength and elongation at break while having the effects of high hardness and effectively mixing with the low-temperature resistant silica gel to form a silica gel body with high structural strength and stability, the high tear-resistant silica gel in the embodiment of the present application includes 90 parts of raw rubber A, 5 parts of raw rubber B, 28 parts of fumed silica, 0.1 part of compound peroxide, and 1.2 parts of hexamethyldisilazane by weight.

[0042] Among them, raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.35%. Raw rubber B is a polymethylsiloxane containing a siloxanyl group as an active group. It should be noted that the molecular formula of the polymethylsiloxane is as follows:

[0043] (CH 3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )R 1 -O] n -[Si(CH 3 )R 2 -O] 20-n -O-Si(CH 3 ) 3；

[0044] Among them, m is a constant from 50 to 3000, n is a constant from 1 to 20; R 1 、R 2 are both siloxanyl groups.

[0045] Polymethylsiloxane is prepared by dropwise adding hydrogen-containing silicone oil into a solution containing isopropanol and chloroplatinic acid. First, an active material with active groups is mixed in the solution, and then the step of dropwise adding hydrogen-containing silicone oil is carried out. The molecular formula of the hydrogen-containing silicone oil is as follows:

[0046] (CH 3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )H-O] n -[Si(CH 3 )H-O] 20-n -O-Si(CH 3 ) 3；

[0047] Among them, m is a constant of 50 - 3000, and n is a constant of 1 - 20. The active material is vinyl dimethyl ethoxysilane. The vinyl group of vinyl dimethyl ethoxysilane undergoes an addition reaction with SI-H.

[0048] Meanwhile, in order to achieve effective catalytic crosslinking, the preparation of the composite peroxide includes: Step ①: Add dicumyl peroxide and chitosan into a solvent with a mass ratio of ethanol to acetic acid of 1:1 at a mass ratio of 0.45:1. After ultrasonic stirring at 65°C for 10 minutes, remove the solvent to obtain a solid precipitate; Step ②: Put the solid precipitate and iron tetroxide into deionized water at a mass ratio of 1:0.01. After ultrasonic stirring evenly at 25°C, remove the moisture and obtain the composite peroxide.

[0049] In the embodiment of the present application, in the preparation of the silicone rubber body, the mixing includes: Step ①: Roll and mix high tear-resistant silicone rubber, low-temperature-resistant silicone rubber and vulcanizing agent, and then put them into an extruder for high-temperature vulcanization and extrusion to form a preliminary rubber strip; Step ②: Put the preliminary rubber strip into an oven for secondary vulcanization, control the oven temperature at 150°C, and obtain the rubber strip body.

[0050] It should be noted that the preparation method of the coating includes: Step ①: Clean and dry the surface of the rubber strip body; Step ②: Uniformly spray the water-based material on the surface of the rubber strip body; Step ③: Put the rubber strip body with the water-based material on the surface into an oven for baking, control the oven temperature at 80°C, and the time is 15 minutes. The bracket includes a plastic part and a hardware part. The plastic part is obtained by drying the injection molding material, injection molding and demolding. The hardware part is obtained by punching and forming a SPCC coil and then spray painting. Since the materials of the plastic part and the hardware part are commercially available and the preparation process is an existing conventional process, it will not be elaborated here.

[0051] A manufacturing method of a water-based coated windshield wiper, which is used to prepare the water-based coated windshield wiper as described above, includes the following steps:

[0052] Step 1: Bake the injection molding material, perform injection molding and demolding to obtain a plastic part, and perform punching and forming on the SPCC coil material by a punching machine and transfer and spray plastic to obtain a hardware part. Finally, combine the injection molding material and the hardware part to form a bracket;

[0053] Step 2: Knead and vulcanize the silicone and the vulcanizing agent to obtain a silicone body, then spray a water-based material on the surface of the silicone body and cure it to form a rubber strip with a coating;

[0054] Step 3: Insert the rubber strip into the bracket and fix it.

[0055] Embodiment 2

[0056] A water-based coated windshield wiper includes a rubber strip and a bracket. The bracket is used for detachable connection and fixation with an automobile and is used for detachable connection of the rubber strip. The bracket is manufactured according to the vehicle model and will not be elaborated 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 formed by spraying a water-based material on the outside of the silicone body and drying and curing. The coating enables the water-based coated windshield wiper to have a water-repellent performance, so that after the silicone windshield wiper rubber strip rubs against the glass for a period of time, a silicone grease coating film will be formed on the glass surface. Thus, when rain falls on the car glass, it will gather into drops of water, and then the drops of water will be taken away by the windward impact generated during the driving of the automobile. At the same time, it will also make the driver's front view clearer when driving in rainy weather.

[0057] In order to optimize the silicone body and improve the structural strength and stability of the silicone body in the embodiment of the present application, thereby effectively extending the service life of the silicone body, the silicone and the vulcanizing agent are kneaded and vulcanized. During the kneading and vulcanizing process, the temperature is controlled at 150 °C until the vulcanization reaction is complete. Among them, the silicone includes high tear-resistant silicone and low-temperature resistant silicone with a mass ratio of 1:1. The addition amount of the vulcanizing agent is 2.2 wt% of the silicone body. In order to significantly improve the tensile strength and elongation at break while having the effects of high hardness and effective mixing with the 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 of raw rubber A, 6 parts of raw rubber B, 35 parts of fumed silica, 0.3 part of compound peroxide and 2 parts of hexamethyldisilazane by weight.

[0058] Among them, raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.4%. Raw rubber B is a polymethylsiloxane containing siloxane group and sulfonic acid group as active groups. It should be noted that the molecular formula of the polymethylsiloxane is as follows:

[0059] (CH3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )R 1 -O] n -[Si(CH 3 )R 2 -O] 20-n -O-Si(CH 3 ) 3；

[0060] wherein, m is a constant from 50 to 3000, and n is a constant from 1 to 20; R 1 and R 2 are independently a siloxanyl group and a sulfonic acid group respectively.

[0061] The polymethylsiloxane is prepared by dropwise adding a hydrogen-containing silicone oil into a solution containing isopropanol and chloroplatinic acid. First, an active material with active groups is mixed in the solution, and then the step of dropwise adding the hydrogen-containing silicone oil is carried out. The molecular formula of the hydrogen-containing silicone oil is as follows:

[0062] (CH 3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )H-O] n -[Si(CH 3 )H-O] 20-n -O-Si(CH 3 ) 3；

[0063] wherein, m is a constant from 50 to 3000, and n is a constant from 1 to 20; the active materials are vinyl dimethyl ethoxysilane and vinyl sulfonic acid.

[0064] Meanwhile, in order to achieve an effective catalytic cross-linking effect, the preparation of the composite peroxide adopted includes: Step ① adding dicumyl peroxide and chitosan into a solvent with a mass ratio of ethanol to acetic acid of 1:1 at a mass ratio of 0.55:1, 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 iron tetroxide into deionized water at a mass ratio of 1:0.03, and removing the water after ultrasonic stirring evenly at 25°C to obtain the composite peroxide.

[0065] In the embodiments of the present application, in the preparation of the silicone body, the mixing process includes Step ①: rolling and mixing high tear-resistant silicone, low-temperature resistant silicone and vulcanizing agent, 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 at 150 °C to obtain the rubber strip body.

[0066] It should be noted that the preparation method of the coating includes Step 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: putting the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature at 100 °C and the time at 13 min. The bracket includes a plastic part and a hardware part. The plastic part is obtained by drying the injection molding material, injection molding and demolding. The hardware part is obtained by punching and forming the SPCC coil material and then spray painting during transportation. Since the materials of the plastic part and the hardware part are commercially available and the preparation process is an existing conventional process, it will not be elaborated here.

[0067] A manufacturing method of a water-based coated windshield wiper for preparing the water-based coated windshield wiper as described above includes the following steps:

[0068] Step 1: Dry the injection molding material, perform injection molding and demolding to obtain the plastic part, punch and form the SPCC coil material and then spray paint during transportation to obtain the hardware part, and finally combine the injection molding material and the hardware part to form the bracket;

[0069] Step 2: Mix and vulcanize the silicone and the vulcanizing agent to form the silicone body, then spray the water-based material on the surface of the silicone body and cure it to form a rubber strip with a coating;

[0070] Step 3: Insert the rubber strip into the bracket and fix it.

[0071] Embodiment 3

[0072] A water-based coated windshield wiper includes a rubber strip and a bracket. The bracket is used for detachably connecting and fixing to an automobile and for detachably connecting the rubber strip. The bracket is manufactured according to the vehicle model and will not be elaborated here. In the embodiments of the present application, the rubber strip used includes a silicone body and a coating attached to the outer side of the silicone body. The coating is formed by spraying the water-based material on the outer side of the silicone body and drying and curing it. The coating enables the water-based coated windshield wiper to have a water-repellent property, so that after the silicone windshield wiper rubber strip rubs against the glass for a period of time, a silicone grease coating film will be formed on the glass surface. Thus, when rainwater falls on the vehicle glass, it will gather into beads, and then be carried away by the windward impact generated during the driving of the vehicle. At the same time, it will also make the driver's front line of sight clearer when driving in rainy weather.

[0073] In the embodiments of the present application, in order to optimize the silica gel body, improve the structural strength and stability of the silica gel body, and thus effectively extend the service life of the silica gel body, the silica gel and the vulcanizing agent are kneaded and vulcanized and molded. During the kneading and vulcanizing molding process, the temperature is controlled at 155 °C until the vulcanization reaction is complete. Among them, the silica gel includes high tear-resistant silica gel and low-temperature-resistant silica gel in a mass ratio of 1:2. The addition amount of the vulcanizing agent is 3.2 wt% of the silica gel body. In order to significantly improve the tensile strength and elongation at break while having the effects of high hardness and effectively mixing with the low-temperature-resistant silica gel to form a silica gel body with high structural strength and stability, the high tear-resistant silica gel in the embodiments of the present application includes 95 parts by weight of raw rubber A, 8 parts by weight of raw rubber B, 42 parts by weight of fumed silica, 0.5 part of compound peroxide, and 3.5 parts of hexamethyldisilazane.

[0074] Among them, raw rubber A is methyl vinyl silicone rubber, and the molar content of vinyl is 0.45%. Raw rubber B is a polymethylsiloxane containing a mercapto group as an active group. It should be noted that the molecular formula of the polymethylsiloxane is as follows:

[0075] (CH 3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )R 1 -O] n -[Si(CH 3 )R 2 -O] 20-n -O-Si(CH 3 ) 3；

[0076] Among them, m is a constant from 50 to 3000, and n is a constant from 1 to 20; R 1 、R 2 are mercapto groups.

[0077] The polymethylsiloxane is prepared by dropwise adding hydrogen-containing silicone oil to a solution containing isopropyl alcohol and chloroplatinic acid. First, the active material with an active group is mixed in the solution, and then the step of dropwise adding hydrogen-containing silicone oil is carried out. The molecular formula of the hydrogen-containing silicone oil is as follows:

[0078] (CH 3 ) 3 Si-O-[Si(CH 3 ) 2 -O] m -[Si(CH 3 )H-O] n -[Si(CH 3 )H-O] 20-n-O-Si(CH 3 ) 3；

[0079] Among them, m is a constant from 50 to 3000, and n is a constant from 1 to 20; the active material is 2-vinylmercaptopyrimidine.

[0080] Meanwhile, in order to achieve effective catalytic cross-linking, the preparation of the composite peroxide used includes: Step ① putting dicumyl peroxide and chitosan into a solvent with a mass ratio of ethanol to acetic acid of 1:1 at a mass ratio of 0.65:1, removing the solvent after ultrasonic stirring at 75°C for 10 min to obtain a solid precipitate; Step ② putting the solid precipitate and iron tetroxide into deionized water at a mass ratio of 1:0.05, removing the water after ultrasonic stirring evenly at 25°C, and obtaining the composite peroxide.

[0081] In the embodiment of the present application, in the preparation of the silica gel body, the mixing includes: Step ① rolling and mixing high tear-resistant silica gel, low-temperature-resistant silica gel and vulcanizing agent, 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 at 150°C to obtain the rubber strip body.

[0082] It should be noted that the preparation method of the coating includes: Step 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 putting the rubber strip body with the water-based material on the surface into an oven for baking, controlling the oven temperature at 160°C and the time at 10 min. The bracket includes a plastic part and a hardware part. The plastic part is obtained by drying the injection molding material, injection molding and demolding. The hardware part is obtained by punching and forming SPCC coil stock and then spray painting during transmission. Since the materials of the plastic part and the hardware part are commercially available and the preparation process is an existing conventional process, it will not be elaborated here.

[0083] A manufacturing method of a water-based coating windshield wiper for preparing the water-based coating windshield wiper as described above includes the following steps:

[0084] Step 1: Dry the injection molding material, injection mold and demold it to obtain a plastic part, punch and form SPCC coil stock and then spray paint during transmission to obtain a hardware part, and finally combine the injection molding material and the hardware part to form a bracket;

[0085] Step 2: Mix and vulcanize silica gel and a vulcanizing agent to form a silica gel body, then spray a water-based material on the surface of the silica gel body and cure it to form a rubber strip with a coating;

[0086] Step 3: Insert the rubber strip into the bracket for fixation.

[0087] Comparative Example 1

[0088] The difference between Comparative Example 1 and Example 1 is that the raw rubber A in Comparative Example 1 is methyl vinyl silicone rubber, and the vinyl molar content is 0.15%.

[0089] Comparative Example 2

[0090] The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, iron trioxide is used instead of the composite peroxide.

[0091] Test:

[0092] Performance tests were carried out on Examples 1 to 3 and Comparative Examples 1 to 2 of the present application, and the performance test results are shown in Table 1 below.

[0093] Among them, performance tests were carried out on Examples 1 to 3 and Comparative Examples 1 to 2.

[0094] 1. Tear strength: Implemented according to GB / T 529-2008 "Rubber, vulcanized or thermoplastic - Determination of tear strength".

[0095] 2. Tensile strength: Implemented according to GB / T 528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties".

[0096] 3. Elongation at break: Implemented according to GB / T 528-2009 "Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties".

[0097] 4. Coefficient of friction - Test of the coefficient of friction with glass: Implemented using a silicone rubber sliding friction wear / rolling friction coefficient testing machine;

[0098] 5. Aging resistance test: Placed at 35°C under ultraviolet irradiation (controlling the ultraviolet index (UVI) to be 6) for 2 months and 6 months, and checked the status.

[0099] Table 1 Performance test results

[0100]

[0101] As can be seen from Table 1 above, the water-based coated windshield wiper prepared by the present invention has a high tensile strength, and on the basis of the high tensile strength, it has the effects of high elongation at break and tear strength, and forms a low coefficient of friction with the glass through its strength and toughness, and can effectively wipe off the stains and rainwater on the glass surface, achieving the functions of high cleaning and aging resistance.

[0102] As can be seen from the above solution, the present application provides an aqueous coating wiper and a manufacturing method thereof. During the preparation process of the silicone rubber body of the aqueous coating wiper, the high tear-resistant silicone rubber obtained from raw rubber A, raw rubber B, fumed silica, compound peroxide and structural inhibitor can significantly improve the tensile strength and elongation at break while having a high hardness and the effect of being effectively mixed with low-temperature-resistant silicone rubber to form a silicone rubber body with high structural strength and stability, thereby achieving the purpose of extending the service life and improving the use effect. The manufacturing method of the aqueous coating wiper has the effects of low difficulty and easy operation and implementation, thereby significantly reducing the cost of the aqueous coating wiper manufactured by the manufacturing method of the aqueous coating wiper and being suitable for large-scale mass production.

[0103] The "first", "second", "third", "fourth", etc. (if any) involved in the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than that described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods or devices.

[0104] It should be noted that the descriptions involving "first", "second", etc. in the present application are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0105] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to 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 comprises 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 a water-based material and 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 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; 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; 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 or sulfonic acid groups respectively; 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.

2. The water-based coated wiper blade according to claim 1, characterized in that: The stirring is carried out by ultrasonic stirring.

3. 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.

4. 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.

5. The water-based coated wiper blade according to claim 4, 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.

6. 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.

7. A method for manufacturing a water-based coated wiper blade, for preparing the water-based coated wiper blade as claimed in any one of claims 1 to 6, 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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