Super-hydrophobic electric rubber and production process thereof

Abstract

The invention discloses super-hydrophobic electric rubber and a production process thereof, modified rubber, a modified additive and fumed silica are added into an internal mixer for melt mixing to prepare a mixture, the mixture and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane are subjected to melt mixing to prepare vulcanized rubber, the vulcanized rubber is subjected to vulcanization treatment, and the super-hydrophobic electric rubber is obtained. In the vulcanization process of the raw materials, double bonds on the modified rubber and the modified additive generate free radical crosslinking, then a three-dimensional grid structure is formed, multiple crosslinking sites can reduce molecular chain movement and stabilize surface low-energy group arrangement, then fluoroalkane is stably arranged on the surface, the hydrophobicity of the material is further improved, and the super-hydrophobic electric power rubber is prepared. The modified additive contains a cage-shaped backboard siloxane structure, cage-shaped backboard siloxane can delay corona aging, disulfide bonds in molecules can be self-repaired after electric arc damage of the electric power rubber, then expansion of cracks is blocked, and the service life of the electric power rubber is prolonged.

Description

Technical Field

[0001] This invention relates to the field of electrical rubber preparation, specifically to a superhydrophobic electrical rubber and its production process. Background Technology

[0002] Electrical rubber is an important material widely used in power systems, primarily for manufacturing electrical equipment such as cables and insulators. These devices play a crucial role in the normal operation of power systems, requiring excellent electrical insulation properties, mechanical strength, and thermal stability. While traditional electrical rubber materials can meet general electrical requirements, their performance often falls short or exhibits limitations in complex application environments, especially high-temperature, high-humidity, or highly corrosive environments. Furthermore, power grid equipment is frequently exposed to various pollution conditions during long-term operation, resulting in extremely harsh operating environments. The hydrophobicity of composite insulators diminishes over time during high-voltage line operation. In special environments such as high pollution, high humidity, high dust, and high salt spray, the durability of the hydrophobicity of composite insulators cannot meet the requirements for flashover protection in power grids. This leads to problems such as hardening, embrittlement, and pulverization of insulator skirts, and loosening and pulverization of the core rod, ultimately resulting in insulator discharge, arcing, electrolytic corrosion, and even flashover, short-circuit breakage accidents. Summary of the Invention

[0003] The purpose of this invention is to provide a super hydrophobic electrical rubber and its production process, which solves the problem that the hydrophobic effect of electrical rubber is generally poor at present.

[0004] The objective of this invention can be achieved through the following technical solutions: A production process for a super hydrophobic electrical rubber specifically includes the following steps: Step A1: Dissolve methyl vinyl silicone rubber in DMF, purge with nitrogen, stir and add trichlorosilane and chloroplatinic acid at a speed of 150-200 r / min and a temperature of 75-85℃, and react for 6-8 hours to obtain pretreated silicone rubber. Step A2: Mix lithium dimethylvinylsilane and tetrahydrofuran evenly, stir and add trifluoropropylmethylcyclotrisiloxane at a speed of 150-200 r / min and a temperature of 0℃, raise the temperature to 25-30℃ and react for 7-9 h, then add pretreated silicone rubber and continue the reaction for 1-1.5 h to obtain modified rubber. Step A3: Add the modified rubber, modified additives, and fumed silica to a mixer and melt-mix for 5-10 minutes at 120-130℃ to obtain a mixture. Add the mixture and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane to a two-roll mill and melt-mix for 5-8 minutes at 100-110℃ to obtain a vulcanizate. Place the vulcanizate in a vulcanizer and vulcanize for 8-10 minutes at 160℃ and 10MPa. Then, vulcanize for another 3-5 hours at 200℃ to obtain a superhydrophobic electrical rubber.

[0005] Furthermore, in step A1, the molar ratio of the double bond on the methyl vinyl silicone rubber to trichlorosilane is 1:1, and the amount of chloroplatinic acid used is 1‰ of the mass of trichlorosilane.

[0006] Furthermore, the molar ratio of lithium dimethylvinylsilane, trifluoropropylmethylcyclotrisiloxane, and the Si-Cl bond on the pretreated silicone rubber in step A2 is 1:5:1.

[0007] Furthermore, the weight ratio of the modified rubber, modified additive, fumed silica and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane mentioned in step A3 is 100-120:6-10:40-50:0.8-1.

[0008] Furthermore, the modified additive is prepared by the following steps: Step B1: Trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water are mixed evenly and reacted at 120-150 r / min and 70-75℃ for 4-6 h. Then, the temperature is lowered to 20-25℃ and the reaction is continued for 10-15 h to obtain trisodium hepta(3,3,3-trifluoropropyl)siloxane. Trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, and tetrahydrofuran are mixed evenly and stirred at 200-300 r / min and 0℃. Trichlorosilane is added and the mixture is reacted for 3-5 h. Then, the temperature is raised to 20-25℃ and the reaction is continued for 20-24 h to obtain pretreated silsesquioxane. Step B2: Mix pretreated silsesquioxane, p-hydroxystyrene, chloroplatinic acid, and DMF evenly, purge with nitrogen, and react for 6-8 hours at a speed of 200-300 r / min and a temperature of 75-85℃ to obtain functionalized silsesquioxane. Mix 2-hydroxyethyl disulfide, boron trifluoride ether, and acetone evenly, stir and add epichlorohydrin at a speed of 120-150 r / min and a temperature of 65-70℃, and react for 2-3 hours. Then add sodium hydroxide solution, raise the temperature to 75-80℃, and react for 2-4 hours to obtain the modifier. Step B3: Mix functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF, purge with nitrogen, and react for 5-7 hours at a speed of 150-200 r / min and a temperature of 70-75℃ to obtain modified silsesquioxane. Mix modified silsesquioxane, acrylic acid, p-toluenesulfonic acid and DMF evenly, and react for 3-5 hours at a speed of 120-150 r / min and a temperature of 110-120℃ to obtain modified additive.

[0009] Furthermore, in step B1, the ratio of trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water is 46 mmol:20 mmol:50 mL:58 mmol, and the ratio of trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, tetrahydrofuran, and trichlorosilane is 1.76 mmol:5.28 mmol:40 mL:0.236 mmol.

[0010] Furthermore, in step B2, the molar ratio of the pretreated silsesquioxane and p-hydroxystyrene is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of p-hydroxystyrene, and the ratio of the amounts of 2-hydroxyethyl disulfide, boron trifluoride ether, acetone, oxychloropropane, and sodium hydroxide solution is 30mmol:0.9g:20mL:60mmol:7mL, with the sodium hydroxide solution having a mass fraction of 25%.

[0011] Furthermore, the ratio of functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF in step B3 is 10 mmol: 5 mmol: 1.5 mmol: 0.5 mmol: 15 mL, the molar ratio of hydroxyl groups on the modified silsesquioxane to acrylic acid is 1:1, and the amount of p-toluenesulfonic acid is 5% of the mass of acrylic acid.

[0012] The beneficial effects of the present invention are as follows: The superhydrophobic electrical rubber prepared by the present invention comprises the following raw materials: modified rubber, modified additives, fumed silica and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane. The modified rubber is prepared by reacting methyl vinyl silicone rubber with trichlorosilane, so that the double bonds on the methyl vinyl silicone rubber react with the Si-H bonds on the trichlorosilane to obtain pretreated silicone rubber. Dimethyl vinyl silanol lithium is used as an initiator and trifluoropropylmethylcyclotrisiloxane is used as a polymerization monomer. The pretreated rubber is then added to react the Si-Cl bonds with the silanol lithium to obtain the modified rubber.

[0013] The modified additive is prepared by hydrolysis and condensation of trimethoxy(3,3,3-trifluoropropyl)silane to obtain trisodium hepta(3,3,3-trifluoropropyl)siloxane. The trisodium hepta(3,3,3-trifluoropropyl)siloxane is then reacted with trichlorosilane, causing the sodium silanolate on the trisodium hepta(3,3,3-trifluoropropyl)siloxane to react with the chlorine atom sites on the trichlorosilane, yielding a pretreated silsesquioxane. This pretreated silsesquioxane is then reacted with p-hydroxystyrene, causing the Si-H bonds on the pretreated silsesquioxane to react with the double bonds on the p-hydroxystyrene, yielding a functional additive. Modified silsesquioxanes are prepared by reacting 2-hydroxyethyl disulfide with epichlorohydrin, causing the hydroxyl groups on the 2-hydroxyethyl disulfide to react with the epoxy groups on the epichlorohydrin, followed by ring closure in the presence of sodium hydroxide solution to form new epoxy groups, thus obtaining a modifier. The modified silsesquioxane is then prepared by reacting functionalized silsesquioxanes with the modifier, causing the phenolic hydroxyl groups on the functionalized silsesquioxane to react with the epoxy groups on the modifier to form new hydroxyl groups, thus obtaining a modified silsesquioxane. Finally, the modified silsesquioxane is prepared by reacting it with acrylic acid, causing the hydroxyl groups on the modified silsesquioxane to esterify with the carboxyl groups on the acrylic acid, thus obtaining a modified additive.

[0014] During the raw material vulcanization process, under the action of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, the double bonds on the modified rubber and the modifying additives undergo free radical cross-linking, thereby forming a three-dimensional network structure. The multiple cross-linking sites can reduce molecular chain movement and stabilize the arrangement of low-energy groups on the surface, thus allowing fluoroalkane to be stably arranged on the surface, further improving the hydrophobicity of the material. The modifying additives contain cage-like backplate siloxane structures, which can delay corona aging. The disulfide bonds within the molecules can self-repair after arc damage to the electric rubber, thereby preventing the expansion of cracks and extending the service life of the electric rubber. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1: A production process for a super hydrophobic electrical rubber, specifically including the following steps: Step A1: Dissolve methyl vinyl silicone rubber in DMF, purge with nitrogen, stir at 150 r / min and 75 ℃, add trichlorosilane and chloroplatinic acid, and react for 6 h to obtain pretreated silicone rubber. Step A2: Mix lithium dimethylvinylsilane and tetrahydrofuran evenly, stir and add trifluoropropylmethylcyclotrisiloxane at a speed of 150 r / min and a temperature of 0℃, heat to 25℃ and react for 7 h, then add pretreated silicone rubber and continue to react for 1 h to obtain modified rubber. Step A3: Add the modified rubber, modified additives, and fumed silica to a mixer and melt-mix for 5 minutes at 120°C to obtain a mixture. Add the mixture and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane to a two-roll mill and melt-mix for 5 minutes at 100°C to obtain a vulcanizate. Place the vulcanizate in a vulcanizer and vulcanize for 8 minutes at 160°C and 10 MPa. Then, vulcanize for another 3 hours at 200°C to obtain a superhydrophobic electrical rubber.

[0017] The molar ratio of the double bond and trichlorosilane on the methyl vinyl silicone rubber described in step A1 is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, and the methyl vinyl silicone rubber is model 110-2.

[0018] The molar ratio of lithium dimethylvinylsilane, trifluoropropylmethylcyclotrisiloxane, and the Si-Cl bond on the pretreated silicone rubber in step A2 is 1:5:1.

[0019] The modified rubber, modified additives, fumed silica and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane mentioned in step A3 are in a weight ratio of 100:6:40:0.8, and the fumed silica is of type HB-620.

[0020] The modified additive is prepared by the following steps: Step B1: Trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water were mixed evenly and reacted at 120 r / min and 70 °C for 4 h. The temperature was then lowered to 20 °C and the reaction was continued for 10 h to obtain trisodium hepta(3,3,3-trifluoropropyl)siloxane. Trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, and tetrahydrofuran were mixed evenly and stirred at 200 r / min and 0 °C. Trichlorosilane was added and the mixture was reacted for 3 h. The temperature was then raised to 20 °C and the reaction was continued for 20 h to obtain pretreated silsesquioxane. Step B2: Mix pretreated silsesquioxane, p-hydroxystyrene, chloroplatinic acid and DMF evenly, purge with nitrogen, and react for 6 hours at 200 r / min and 75°C to obtain functionalized silsesquioxane. Mix 2-hydroxyethyl disulfide, boron trifluoride ether and acetone evenly, stir and add epichlorohydrin at 120 r / min and 65°C, and react for 2 hours. Then add sodium hydroxide solution, raise the temperature to 75°C, and react for 2 hours to obtain the modifier. Step B3: The functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF are mixed and purged with nitrogen. The mixture is then reacted for 5 hours at a speed of 150 r / min and a temperature of 70 °C to obtain the modified silsesquioxane. The modified silsesquioxane, acrylic acid, p-toluenesulfonic acid and DMF are then mixed evenly and reacted for 3 hours at a speed of 120 r / min and a temperature of 110 °C to obtain the modified additive.

[0021] The ratio of trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water in step B1 is 46 mmol:20 mmol:50 mL:58 mmol, and the ratio of trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, tetrahydrofuran, and trichlorosilane is 1.76 mmol:5.28 mmol:40 mL:0.236 mmol.

[0022] In step B2, the molar ratio of pretreated silsesquioxane and p-hydroxystyrene is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of p-hydroxystyrene, and the ratio of 2-hydroxyethyl disulfide, boron trifluoride ether, acetone, oxychloropropane and sodium hydroxide solution is 30mmol:0.9g:20mL:60mmol:7mL, with the sodium hydroxide solution having a mass fraction of 25%.

[0023] The ratio of functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF in step B3 is 10 mmol: 5 mmol: 1.5 mmol: 0.5 mmol: 15 mL. The molar ratio of hydroxyl groups on the modified silsesquioxane to acrylic acid is 1:1. The amount of p-toluenesulfonic acid is 5% of the mass of acrylic acid.

[0024] Example 2, a production process for a super hydrophobic electrical rubber, specifically includes the following steps: Step A1: Dissolve methyl vinyl silicone rubber in DMF, purge with nitrogen, stir at 150 r / min and 80 °C, add trichlorosilane and chloroplatinic acid, and react for 7 h to obtain pretreated silicone rubber. Step A2: Mix lithium dimethylvinylsilane and tetrahydrofuran evenly, stir and add trifluoropropylmethylcyclotrisiloxane at a speed of 150 r / min and a temperature of 0℃, heat to 28℃ and react for 8 h, then add pretreated silicone rubber and continue to react for 1.3 h to obtain modified rubber. Step A3: Add the modified rubber, modified additives, and fumed silica to a mixer and melt mix for 8 minutes at 125°C to obtain a mixture. Add the mixture and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane to a two-roll mill and melt mix for 6 minutes at 105°C to obtain a vulcanizate. Place the vulcanizate in a vulcanizer and vulcanize for 9 minutes at 160°C and 10 MPa. Then, vulcanize for another 4 hours at 200°C to obtain a superhydrophobic electrical rubber.

[0025] The molar ratio of the double bond and trichlorosilane on the methyl vinyl silicone rubber described in step A1 is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, and the methyl vinyl silicone rubber is model 110-2.

[0026] The molar ratio of lithium dimethylvinylsilane, trifluoropropylmethylcyclotrisiloxane, and the Si-Cl bond on the pretreated silicone rubber in step A2 is 1:5:1.

[0027] The modified rubber, modified additives, fumed silica and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane mentioned in step A3 have a weight ratio of 110:8:45:0.9, and the fumed silica is of type HB-620.

[0028] The modified additive is prepared by the following steps: Step B1: Trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water were mixed evenly and reacted at 120 r / min and 75°C for 5 h. The temperature was then lowered to 23°C and the reaction was continued for 15 h to obtain trisodium hepta(3,3,3-trifluoropropyl)siloxane. Trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, and tetrahydrofuran were mixed evenly and stirred at 200 r / min and 0°C. Trichlorosilane was added and the mixture was reacted for 4 h. The temperature was then raised to 20°C and the reaction was continued for 22 h to obtain pretreated silsesquioxane. Step B2: Mix pretreated silsesquioxane, p-hydroxystyrene, chloroplatinic acid and DMF evenly, purge with nitrogen, and react for 7 hours at 200 r / min and 80°C to obtain functionalized silsesquioxane. Mix 2-hydroxyethyl disulfide, boron trifluoride ether and acetone evenly, stir and add epichlorohydrin at 120 r / min and 70°C, and react for 2 hours. Then add sodium hydroxide solution, raise the temperature to 80°C, and react for 3 hours to obtain the modifier. Step B3: Functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF are mixed, and nitrogen gas is introduced for protection. The mixture is reacted for 6 hours at a speed of 150 r / min and a temperature of 75°C to obtain modified silsesquioxane. Modified silsesquioxane, acrylic acid, p-toluenesulfonic acid and DMF are mixed evenly and reacted for 4 hours at a speed of 120 r / min and a temperature of 115°C to obtain modified additive.

[0029] The ratio of trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water in step B1 is 46 mmol:20 mmol:50 mL:58 mmol, and the ratio of trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, tetrahydrofuran, and trichlorosilane is 1.76 mmol:5.28 mmol:40 mL:0.236 mmol.

[0030] In step B2, the molar ratio of pretreated silsesquioxane and p-hydroxystyrene is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of p-hydroxystyrene, and the ratio of 2-hydroxyethyl disulfide, boron trifluoride ether, acetone, oxychloropropane and sodium hydroxide solution is 30mmol:0.9g:20mL:60mmol:7mL, with the sodium hydroxide solution having a mass fraction of 25%.

[0031] The ratio of functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF in step B3 is 10 mmol: 5 mmol: 1.5 mmol: 0.5 mmol: 15 mL. The molar ratio of hydroxyl groups on the modified silsesquioxane to acrylic acid is 1:1. The amount of p-toluenesulfonic acid is 5% of the mass of acrylic acid.

[0032] Example 3, a production process for a super hydrophobic electrical rubber, specifically includes the following steps: Step A1: Dissolve methyl vinyl silicone rubber in DMF, purge with nitrogen, stir and add trichlorosilane and chloroplatinic acid at a speed of 200 r / min and a temperature of 85°C, and react for 8 hours to obtain pretreated silicone rubber. Step A2: Mix lithium dimethylvinylsilane and tetrahydrofuran evenly, stir and add trifluoropropylmethylcyclotrisiloxane at a speed of 200 r / min and a temperature of 0℃, heat to 30℃ and react for 9 h, then add pretreated silicone rubber and continue to react for 1.5 h to obtain modified rubber. Step A3: Add the modified rubber, modified additives, and fumed silica to a mixer and melt-mix for 10 minutes at 130°C to obtain a mixture. Add the mixture and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane to a two-roll mill and melt-mix for 8 minutes at 110°C to obtain a vulcanizate. Place the vulcanizate in a vulcanizer and vulcanize for 10 minutes at 160°C and 10 MPa. Then, vulcanize for another 5 hours at 200°C to obtain a superhydrophobic electrical rubber.

[0033] The molar ratio of the double bond and trichlorosilane on the methyl vinyl silicone rubber described in step A1 is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, and the methyl vinyl silicone rubber is model 110-2.

[0034] The molar ratio of lithium dimethylvinylsilane, trifluoropropylmethylcyclotrisiloxane, and the Si-Cl bond on the pretreated silicone rubber in step A2 is 1:5:1.

[0035] The modified rubber, modified additive, fumed silica and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane mentioned in step A3 are in a weight ratio of 120:10:50:1, and the fumed silica is of type HB-620.

[0036] The modified additive is prepared by the following steps: Step B1: Trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water were mixed evenly and reacted at 150 r / min and 75°C for 6 h. The temperature was then lowered to 25°C and the reaction was continued for 15 h to obtain trisodium hepta(3,3,3-trifluoropropyl)siloxane. Trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, and tetrahydrofuran were mixed evenly and stirred at 300 r / min and 0°C. Trichlorosilane was added and the mixture was reacted for 5 h. The temperature was then raised to 25°C and the reaction was continued for 24 h to obtain pretreated silsesquioxane. Step B2: Mix pretreated silsesquioxane, p-hydroxystyrene, chloroplatinic acid and DMF evenly, purge with nitrogen, and react for 8 hours at 300 r / min and 85°C to obtain functionalized silsesquioxane. Mix 2-hydroxyethyl disulfide, boron trifluoride ether and acetone evenly, stir and add epichlorohydrin at 150 r / min and 70°C, and react for 3 hours. Then add sodium hydroxide solution, raise the temperature to 80°C, and react for 4 hours to obtain the modifier. Step B3: Functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF are mixed, and nitrogen gas is introduced for protection. The mixture is reacted for 7 hours at a rotation speed of 200 r / min and a temperature of 75℃ to obtain modified silsesquioxane. Modified silsesquioxane, acrylic acid, p-toluenesulfonic acid and DMF are mixed evenly and reacted for 5 hours at a rotation speed of 150 r / min and a temperature of 120℃ to obtain modified additive.

[0037] The ratio of trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water in step B1 is 46 mmol:20 mmol:50 mL:58 mmol, and the ratio of trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, tetrahydrofuran, and trichlorosilane is 1.76 mmol:5.28 mmol:40 mL:0.236 mmol.

[0038] In step B2, the molar ratio of pretreated silsesquioxane and p-hydroxystyrene is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of p-hydroxystyrene, and the ratio of 2-hydroxyethyl disulfide, boron trifluoride ether, acetone, oxychloropropane and sodium hydroxide solution is 30mmol:0.9g:20mL:60mmol:7mL, with the sodium hydroxide solution having a mass fraction of 25%.

[0039] The ratio of functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF in step B3 is 10 mmol: 5 mmol: 1.5 mmol: 0.5 mmol: 15 mL. The molar ratio of hydroxyl groups on the modified silsesquioxane to acrylic acid is 1:1. The amount of p-toluenesulfonic acid is 5% of the mass of acrylic acid.

[0040] Comparative Example 1: This comparative example uses methyl vinyl silicone rubber instead of the modified rubber, while the other steps are the same as in Example 1.

[0041] Comparative Example 2: Compared with Example 1, this comparative example uses hexamethylcyclotrisiloxane instead of trifluoropropylmethylcyclotrisiloxane, and the other steps are the same.

[0042] Comparative Example 3: This comparative example uses ethylene glycol instead of 2-hydroxyethyl disulfide, but the other steps are the same as in Example 1.

[0043] The electrical rubbers prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to hydrophobic migration tests according to the hydrophobicity measurement method for composite insulators with nominal voltages higher than 1000V in AC and DC systems, as specified in DL / T1474-2015. The hydrophobicity level and contact angle were measured after migration for 24h, 72h, 120h, and 240h. The test results are shown in Table 1 below.

[0044] Table 1 As shown in Table 1, this application has excellent hydrophobic properties.

[0045] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A production process for a super hydrophobic electrical rubber, characterized in that: Specifically, the steps include the following: Step A1: Dissolve methyl vinyl silicone rubber in DMF, purge with nitrogen for protection, stir and add trichlorosilane and chloroplatinic acid to react and obtain pretreated silicone rubber; Step A2: Mix lithium dimethylvinylsilane and tetrahydrofuran and add trifluoropropylmethylcyclotrisiloxane. After heating and reacting, add pretreated silicone rubber and continue the reaction to obtain modified rubber. Step A3: Add the modified rubber, modified additives and fumed silica to a mixer and melt mix to obtain a mixture. Add the mixture and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane to a two-roll mill and melt mix to obtain a vulcanized rubber. Vulcanize the vulcanized rubber to obtain a super hydrophobic electrical rubber.

2. The production process of a super hydrophobic electrical rubber according to claim 1, characterized in that: The molar ratio of the double bond and trichlorosilane on the methyl vinyl silicone rubber described in step A1 is 1:

1.

3. The production process of a super hydrophobic electrical rubber according to claim 1, characterized in that: The molar ratio of lithium dimethylvinylsilane, trifluoropropylmethylcyclotrisiloxane, and the Si-Cl bond on the pretreated silicone rubber in step A2 is 1:5:

1.

4. The production process of a super hydrophobic electrical rubber according to claim 1, characterized in that: The weight ratio of the modified rubber, modified additive, fumed silica and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane mentioned in step A3 is 100-120:6-10:40-50:0.8-1.

5. The production process of a super hydrophobic electrical rubber according to claim 1, characterized in that: The modified additive is prepared by the following steps: Step B1: Trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water are mixed and reacted to prepare trisodium hepta(3,3,3-trifluoropropyl)siloxane. Trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, and tetrahydrofuran are mixed and stirred, and trichlorosilane is added to carry out the reaction to obtain pretreated silsesquioxane. Step B2: Mix pretreated silsesquioxane, p-hydroxystyrene, chloroplatinic acid and DMF evenly, purge with nitrogen for protection, and react to obtain functionalized silsesquioxane. Mix 2-hydroxyethyl disulfide, boron trifluoride ether and acetone, stir and add epichlorohydrin, react and add sodium hydroxide solution, heat and react to obtain modifier. Step B3: Functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF are mixed and reacted under nitrogen protection to obtain modified silsesquioxane. Modified silsesquioxane, acrylic acid, p-toluenesulfonic acid and DMF are mixed and reacted to obtain modified additive.

6. The production process of a super hydrophobic electrical rubber according to claim 5, characterized in that: The ratio of trimethoxy(3,3,3-trifluoropropyl)silane, sodium hydroxide, tetrahydrofuran, and deionized water in step B1 is 46 mmol:20 mmol:50 mL:58 mmol, and the ratio of trisodium hepta(3,3,3-trifluoropropyl)siloxane, triethylamine, tetrahydrofuran, and trichlorosilane is 1.76 mmol:5.28 mmol:40 mL:0.236 mmol.

7. The production process of a super hydrophobic electrical rubber according to claim 5, characterized in that: The molar ratio of pretreated silsesquioxane and p-hydroxystyrene in step B2 is 1:1, and the volume ratio of 2-hydroxyethyl disulfide, boron trifluoride ether, acetone, oxychloropropane and sodium hydroxide solution is 30 mmol: 0.9 g: 20 mL: 60 mmol: 7 mL.

8. The production process of a super hydrophobic electrical rubber according to claim 5, characterized in that: The ratio of functionalized silsesquioxane, modifier, triphenylphosphine, zinc chloride and DMF in step B3 is 10 mmol: 5 mmol: 1.5 mmol: 0.5 mmol: 15 mL, and the molar ratio of hydroxyl groups on the modified silsesquioxane to acrylic acid is 1:

1.

9. A superhydrophobic electrical rubber, characterized in that: It is produced by the manufacturing process according to any one of claims 1-8.

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