Room-temperature-cured single-component silicone rubber insulating coating resistant to sand erosion and preparation method thereof

Abstract

The invention discloses a room-temperature-cured single-component silicone rubber insulating coating resistant to wind-sand erosion and a preparation method thereof, and relates to the technical field of silicone rubber coatings. The silicone rubber insulating paint comprises the following raw materials in parts by mass: 100 parts of silicone oil, 10-30 parts of hydroxyl-terminated silicone oil with a multi-telechelic structure, 20-40 parts of reinforced fibers, 30-50 parts of a wear-resistant filler, 5-10 parts of a reinforcing filler, 100-110 parts of a solvent, 3-8 parts of a cross-linking agent, 0.2-0.3 part of a catalyst, 2-3 parts of an adhesion promoter and 5-6 parts of color paste. The hydroxyl-terminated silicone oil with a multi-telechelic structure, the modified reinforced fibers and the modified wear-resistant filler are introduced into a 107 silicone oil system, so that the mechanical properties such as tear resistance and tensile strength of the silicone rubber material are remarkably improved, the wear resistance and the electrical insulation property are remarkably improved, and the problems that traditional silicone rubber is easy to wear and lose efficacy in a wind and sand environment and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of silicone rubber coating technology, specifically to a room-temperature curing single-component silicone rubber insulating coating resistant to wind and sand erosion and its preparation method. Background Technology

[0002] With the continuous advancement of my country's power grid construction, a large number of transmission lines and substation facilities need to be built in the western regions. These areas have harsh climatic conditions and are frequently accompanied by strong winds and sandstorms. Driven by strong winds, hard particles in the sandstorms continuously impact and abrade the outer insulation layers of power equipment (such as the RTV coating on the surface of insulators), causing the coating surface to become rough and thinner, and in severe cases, even broken, resulting in the loss of insulation and anti-flashover capabilities. In addition, line inspections and external impacts can also cause mechanical damage to the insulation coating, causing tears that gradually expand and ultimately lead to protective failure.

[0003] Currently, room temperature vulcanizing silicone rubber, especially 107 silicone rubber (hydroxyl-terminated polydimethylsiloxane), is widely used as a base material for insulating coatings due to its excellent hydrophobicity, weather resistance and ease of construction. However, traditional 107 silicone rubber has obvious disadvantages: (1) Insufficient mechanical properties: the tensile strength of pure 107 rubber after crosslinking and curing is low (usually <0.6MPa), and its tear resistance is poor (usually <3kN / m). It is prone to cracking and rapid propagation under mechanical stress; (2) Poor abrasion resistance: its body hardness is low, and its surface has weak resistance to sand impact and scratching. It is severely worn under long-term wind and sand erosion, affecting the long-term insulation reliability.

[0004] Existing technologies attempt to enhance strength by adding conventional fillers such as silica, but this often leads to decreased elasticity and processing difficulties while increasing strength. Furthermore, it provides limited improvement in abrasion resistance and tear resistance, making it difficult to meet the urgent needs of western power facilities for long-term, highly reliable insulation protection.

[0005] In summary, solving the above problems and preparing a room-temperature curing single-component silicone rubber insulating coating resistant to wind and sand erosion is of great significance. Summary of the Invention

[0006] The purpose of this invention is to provide a room-temperature curing single-component silicone rubber insulating coating resistant to wind and sand erosion and its preparation method, so as to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion comprises the following raw materials, by weight: 100 parts silicone oil, 10-30 parts multi-claw structure hydroxyl-terminated silicone oil, 20-40 parts reinforcing fiber, 30-50 parts abrasion-resistant filler, 5-10 parts reinforcing filler, 100-110 parts solvent, 3-8 parts crosslinking agent, 0.2-0.3 parts catalyst, 2-3 parts adhesion promoter, and 5-6 parts color paste.

[0008] A preferred method for preparing the multi-claw structure hydroxyl-terminated silicone oil includes the following steps: under a nitrogen atmosphere, a hydrogen-containing silicone oil and a multi-hydroxyl MQ type silicone resin are mixed, heated to 120~125℃, Pt-divinyltetramethyldisiloxane is added, and the mixture is stirred for 100~120 min to obtain the multi-claw structure hydroxyl-terminated silicone oil.

[0009] Preferably, the raw materials for the multi-claw structure hydroxyl-terminated silicone oil include hydrogen-containing silicone oil, multi-hydroxyl MQ type silicone resin, and Pt-divinyltetramethyldisiloxane in a mass ratio of 100:5~10:0.2~0.3.

[0010] Preferably, the silicone oil comprises 107 silicone oil with a viscosity of 5000~30000 cs.

[0011] Preferably, the reinforcing filler comprises fumed silica; the crosslinking agent comprises methyltributanone oxime silane; the adhesion promoter comprises 3-aminopropyltriethoxysilane; and the catalyst comprises dibutyltin dilaurate.

[0012] Preferably, the wear-resistant filler includes one or two of talc powder and mica powder; the reinforcing fiber includes one or two of sepiolite fiber and wollastonite fiber.

[0013] Preferably, the wear-resistant filler and reinforcing fiber are modified with a silane coupling agent to obtain modified wear-resistant filler A and modified reinforcing fiber A, which are then used in room temperature curing single-component silicone rubber insulating coatings. The silane coupling agent includes 3-aminopropyltriethoxysilane.

[0014] More preferably, the wear-resistant filler is modified with a silane coupling agent and then end-capped with bisacrylamide to obtain modified wear-resistant filler B, which is then used in room temperature curing single-component silicone rubber insulating coatings. The preparation method of the modified wear-resistant filler B includes the following steps: modifying the wear-resistant filler with a silane coupling agent to obtain modified wear-resistant filler A; ultrasonically dispersing the modified wear-resistant filler A in deionized water, sequentially adding bisacrylamide-terminated polydimethylsiloxane, emulsifier, and diethylenetriamine, mixing evenly, heating to 60~65℃, adding N,N′-methylenebisacrylamide-aqueous solution dropwise, stirring and reacting for 20~24 hours; filtering, washing, and drying to obtain modified wear-resistant filler B; The raw materials for the modified wear-resistant filler B include modified wear-resistant filler A, diethylenetriamine, N,N′-methylenebisacrylamide, and bisacrylamide-terminated polydimethylsiloxane in a mass ratio of 100:7.4~7.6:10.2~10.4:2.3~2.5.

[0015] Preferred method for preparing bisacrylamide-terminated polydimethylsiloxane includes the following steps: adding bis(3-aminopropyl)-terminated polydimethylsiloxane to dichloromethane and mixing evenly; adding acryloyl chloride-dichloromethane solution dropwise at 0-5°C; after the addition is complete, heating to 25-30°C and stirring for 4-5 hours; washing, drying, and removing the solvent by rotary evaporation to obtain bisacrylamide-terminated polydimethylsiloxane.

[0016] The raw materials for the bisacrylamide-terminated polydimethylsiloxane include bis(3-aminopropyl)-terminated polydimethylsiloxane and acryloyl chloride in a mass ratio of 10:1.5~2.3.

[0017] The modified wear-resistant filler is prepared by amylamide reaction of bis(3-aminopropyl)-terminated polydimethylsiloxane with acryloyl chloride to obtain bisacrylamide-terminated polydimethylsiloxane that can participate in Michael addition reaction. Then, using KH-550 modified wear-resistant filler A as the core, bisacrylamide-terminated polydimethylsiloxane, diethylenetriamine, and N,N′-methylenebisacrylamide are used as reaction components to form hyperbranched polyamide modified wear-resistant filler B containing polydimethylsiloxane with multi-terminated amino structure.

[0018] The preferred reinforcing fiber is modified with a silane coupling agent; then waterborne polyurethane is used to obtain modified reinforcing fiber B, which is then used in a room temperature curing single-component silicone rubber insulating coating. The preparation of the modified reinforcing fiber B includes the following steps: (1) Methyl acrylate is added dropwise to isophorone diamine and stirred at 50-60°C for 3-4 hours. Triethylamine-water solution is added and stirred for 0.5-1 hours. Deionized water is added until the solid content is 30-40 wt% to obtain an aqueous chain extender. (2) Silane coupling agent is used to modify the reinforcing fiber to obtain modified reinforcing fiber A. The aqueous chain extender is used to prepare an aqueous polyurethane emulsion. The aqueous polyurethane emulsion is prepared with deionized water to form an aqueous polyurethane slurry of 1-3 wt%. The modified reinforcing fiber A is immersed in it for 20-30 minutes, and then taken out and heat-cured at 120-125°C for 3-5 minutes to obtain modified reinforcing fiber B.

[0019] Preferably, the raw materials of the water-based chain extender include methyl acrylate, isophorone diamine, and triethylamine in a mass ratio of 1:1.95~2:1.17~1.18; The solid content of the waterborne polyurethane slurry is 1~3wt%.

[0020] Preferred method for preparing the waterborne polyurethane emulsion includes the following steps: under a nitrogen atmosphere, polyester diol, after dehydration, isophorone diisocyanate, and dibutyltin dilaurate are stirred and reacted at 80-90°C for 2-3 hours, then cooled to 70-75°C, 1,4-butanediol is added, and the mixture is stirred and reacted for 20-30 minutes. The mixture is then cooled to 50-55°C, tetrahydrofuran is added to reduce viscosity, a waterborne chain extender is added, and the mixture is stirred and reacted for another 30-40 minutes. 3-aminopropyltriethoxysilane is added, and the mixture is stirred and reacted for another 40-60 minutes. Deionized water is slowly added under stirring at 800-1200 rpm. After forming the emulsion, the organic solvent is removed by rotary evaporation, and deionized water is added to obtain a waterborne polyurethane emulsion with a solid content of 40-45 wt%.

[0021] The aqueous polyurethane emulsion comprises the following raw materials in parts by weight: 15-17 parts polyester diol, 5.8-6 parts isophorone diisocyanate, 0.01-0.02 parts dibutyltin dilaurate, 0.3-0.4 parts 1,4-butanediol, 3-4 parts tetrahydrofuran, 2.2-2.4 parts aqueous chain extender, and 3-aminopropyltriethoxysilane.

[0022] The modified reinforcing fiber is prepared as follows: Methyl acrylate and isophorone diamine undergo a Michael addition reaction to obtain an ester intermediate with an amino group at one end and an ester group at the other. This intermediate is then neutralized with triethylamine to obtain an amine carboxylate aqueous chain extender. Further, a polyurethane prepolymer is obtained by reacting polyester diol and isophorone diisocyanate. This prepolymer is then chain-extended by adding the small molecule chain extender 1,4-butanediol and the aqueous amine carboxylate aqueous chain extender. The prepolymer is then partially capped with 3-aminopropyltriethoxysilane and a siloxane is introduced. Finally, water is added and emulsified under high-speed stirring to obtain an aqueous polyurethane emulsion. The reinforcing fiber is then fully impregnated in the polyurethane emulsion slurry, removed, and heat-cured to obtain the waterborne polyurethane modified reinforcing fiber.

[0023] A preferred method for preparing the room-temperature curing single-component silicone rubber insulating coating resistant to wind and sand erosion includes the following steps: mixing silicone oil, multi-claw structure hydroxyl-terminated silicone oil, and reinforcing filler, and stirring and dispersing at 1000-1200 rpm; sequentially adding solvent, color paste, reinforcing fiber, and wear-resistant filler, and stirring and dispersing at 600-800 rpm; sequentially adding crosslinking agent, adhesion promoter, and catalyst, and stirring and dispersing at 400-500 rpm; discharging, sealing, and packaging to obtain the room-temperature curing single-component silicone rubber insulating coating.

[0024] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: By introducing multi-claw structure hydroxyl-terminated silicone oil, modified reinforcing fibers, and modified wear-resistant fillers into the 107 silicone oil system, this invention significantly improves the mechanical properties of silicone rubber materials, such as tear resistance and tensile strength, and also significantly improves wear resistance and electrical insulation properties, solving the problem of easy wear and failure of traditional silicone rubber in windy and sandy environments. At the same time, this invention is convenient to apply and has wide applicability. While maintaining the single-component room temperature curing characteristics, the cured coating has good adhesion, hydrophobicity, and weather resistance, making it suitable for harsh environments requiring protection of electrical equipment, such as outdoor and high-altitude operations.

[0025] In this invention, a multi-claw structure hydroxyl-terminated silicone oil is introduced into 107 silicone oil as a modified resin. The multi-claw structure can maintain the material's flexibility while improving its tensile strength. The wear-resistant filler has a lamellar hard particle structure, which can effectively resist the impact and cutting of wind and sand particles and significantly reduce the wear rate. However, its dispersibility in hydrophobic silicone rubber is poor. Therefore, based on the modification of KH550, a hyperbranched polyamide with a multi-terminated amino structure containing polydimethylsiloxane is further used for modification. The siloxane structure is similar to that of silicone rubber, which improves compatibility and dispersibility. The amino groups in the hyperbranched polyamide structure can form strong hydrogen bonds with silanol groups, which improves the bonding strength of the wear-resistant filler in the matrix and makes it less susceptible to being peeled off by wind and sand, thus improving wear resistance. On the other hand, its hyperbranched topology can effectively disperse stress, dissipate impact energy, and induce crack deflection when the coating is under stress, which significantly enhances the tear resistance of the coating.

[0026] Among them, reinforcing fibers are micron-sized high-strength fiber structures that form an effective network support and stress transfer mechanism in the matrix, further improving tear resistance. Taking sepiolite fiber and wollastonite fiber as examples, both have the characteristics of high aspect ratio and high strength. After improving dispersibility with KH-550, the dispersibility can be improved, thereby improving the rubber properties. However, the former has strong hygroscopicity. Although its addition can accelerate the curing rate to a certain extent, it easily competes with the moisture required for the curing reaction, resulting in difficulty in deep curing of the coating or uneven surface curing, affecting the mechanical properties and adhesion of the final rubber coating. Although the latter has weak hygroscopicity and does not affect the moisture curing process, it has a dense needle-like structure with high rigidity and poor toughness. Direct addition may lead to increased brittleness of the coating and a decrease in tear resistance. Therefore, this application further introduces waterborne polyurethane to coat the reinforcing fibers based on the KH-550 modification. On the one hand, this reduces the moisture absorption of the sepiolite fibers themselves, and on the other hand, it improves the toughness of the wollastonite fibers, thereby improving the mechanical properties of the silicone rubber coating material. In addition, the waterborne polyurethane itself introduces 3-aminopropyltriethoxysilane partial end-capping to improve the interfacial properties with silicone rubber. At the same time, the carboxyl groups of the waterborne component in the waterborne polyurethane can be hydrogen-bonded crosslinked with the aforementioned hyperbranched polyamide structure with multiple amino ends, improving the interfacial properties and bonding strength, thereby improving the mechanical properties of the silicone rubber coating material.

[0027] It is important to note that while carboxyl groups can crosslink with the aforementioned amine groups through hydrogen bonding, improving the bonding strength between the filler and fiber in the matrix, excessive carboxyl content leads to a significant increase in crosslinking density. This makes coating application difficult and increases the brittleness of the rubber coating, reducing tear resistance. Traditional hydrophilic chain extenders, such as 2,2-dimethylolbutyric acid, are small molecules requiring a large amount to achieve uniform emulsification. Increased carboxyl content reduces the tear resistance of silicone rubber. While aqueous chain extenders based on amine sulfonates are highly efficient, their sulfonic acid anions cannot be removed during curing, leading to insulation failure in silicone rubber. Therefore, this invention utilizes an amine carboxylate chain extender based on the addition of methyl acrylate and isophorone diamine followed by neutralization with triethylamine as an aqueous chain extender. This ensures uniform emulsification of the aqueous polyurethane while controlling the carboxyl content to maintain tear resistance and improve strength. Furthermore, the triethylamine salt structure volatilizes after silicone rubber curing, preventing its presence in the system and improving the material's insulation performance. Attached Figure Description

[0028] Figure 1 The infrared spectrum of the multi-claw structure hydroxyl-terminated silicone oil prepared according to the present invention; Figure 2 The infrared spectrum of the hydrogen-containing silicone oil used in this invention; Figure 3 A scanning electron microscope image of the KH-550 modified talc powder prepared in this invention; Figure 4 A scanning electron microscope image of the KH-550 modified mica powder prepared in this invention; Figure 5 Scanning electron microscope image of KH-550 modified sepiolite fiber prepared in this invention; Figure 6 This is a scanning electron microscope image of the KH-550 modified wollastonite fiber prepared according to the present invention. Detailed Implementation

[0029] 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.

[0030] It should be noted that the following quantities are by weight. There are no special restrictions on the manufacturers of the raw materials involved in this invention. Exemplary examples include: hydrogen-containing silicone oil: D-500, Jiangsu Keqi Polymer Materials Research Institute Co., Ltd.; MQ type silicone resin: YDSR1002, Shanghai Yandi New Materials Technology Co., Ltd.; Pt-divinyltetramethyldisiloxane: Pt 2%, Beijing Innocare Technology Co., Ltd.; sepiolite fiber: length 10~100μm, diameter 1~20μm; wollastonite fiber: length 10~100μm, diameter 1~20μm; flake talc powder: aspect ratio > 10, particle size D50 3~15μm; flake mica powder: aspect ratio > 10, particle size D50 3~15μm; bis(3-aminopropyl)-terminated polydimethylsiloxane, brand name MY. 1100-2k, amine value 1mmol / g; polyester diol: poly(1,4-butanediol adipate), molecular weight 2000.

[0031] In the following examples, parts refer to parts by weight, and all raw materials mentioned above and others not mentioned are commercially available.

[0032] Pre-preparation: Preparation of multi-claw structure hydroxyl-terminated silicone oil: Under a nitrogen atmosphere, 100 parts of hydrogen-containing silicone oil and 5 parts of multi-hydroxyl MQ type silicone resin were mixed, heated to 120℃, and 0.2 parts of Pt-divinyltetramethyldisiloxane were added. The mixture was stirred and reacted for 120 min to obtain multi-claw structure hydroxyl-terminated silicone oil. Preparation of modified wear-resistant filler A: 1000 parts of wear-resistant filler were added to 1000 parts of ethanol, 30 parts of deionized water were added, 50 parts of KH-550 were added, the mixture was stirred at 40℃ for 180 min, and then dried to obtain modified wear-resistant filler A. Preparation of modified reinforcing fiber A: 1000 parts of reinforcing fiber were added to 1500 parts of ethanol, 30 parts of deionized water were added, and 50 parts of KH-550 were added. The mixture was stirred at 40°C for 180 min and then dried to obtain modified reinforcing fiber A.

[0033] Example 1: A method for preparing a room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion includes the following steps: 100 parts of 10000cs107 silicone oil, 15 parts of multi-claw structure hydroxyl-terminated silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, 30 parts of modified reinforcing fiber A, and 35 parts of modified wear-resistant filler A were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room temperature curing one-component silicone rubber insulating coating. The wear-resistant filler is talc powder; the reinforcing fiber is sepiolite fiber.

[0034] Example 2: A method for preparing a room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion includes the following steps: Step 1: Preparation of modified wear-resistant filler B: (1) Add bis(3-aminopropyl)-terminated polydimethylsiloxane to dichloromethane and mix evenly. Add acryloyl chloride-dichloromethane solution dropwise at 0°C. After the addition is complete, heat to 30°C and stir for 4 hours. Wash, dry, and remove solvent by rotary evaporation to obtain bisacrylamide-terminated polydimethylsiloxane. The raw materials of bisacrylamide-terminated polydimethylsiloxane include bis(3-aminopropyl)-terminated polydimethylsiloxane and acryloyl chloride in a mass ratio of 10:1.9. (2) Add bisacrylamide-terminated polydimethylsiloxane and Tween-80 to deionized water and mix evenly. Add modified wear-resistant filler A and ultrasonically disperse for 30 min. Add diethylenetriamine and mix evenly. Heat to 65℃ and add N,N′-methylenebisacrylamide-water solution dropwise. After the dropwise addition is complete, stir and react for 24 h. Filter, wash, and dry to obtain modified wear-resistant filler B. The raw materials of modified wear-resistant filler B include wear-resistant filler, diethylenetriamine, N,N′-methylenebisacrylamide, and bisacrylamide-terminated polydimethylsiloxane in a mass ratio of 100:7.5:10.3:2.4. Step 2: Preparation of modified reinforcing fiber B: (1) Methyl acrylate is added dropwise to isophorone diamine and stirred at 55°C for 3 hours. Triethylamine-water solution is added and stirred for 0.5 hours. Deionized water is added until the solid content is 40 wt% to obtain an aqueous chain extender. The raw materials of the aqueous chain extender include methyl acrylate, isophorone diamine and triethylamine in a mass ratio of 1:1.97:1.17. (2) Under a nitrogen atmosphere, 16 parts of polyester diol, after dehydration, were mixed with 5.9 parts of isophorone diisocyanate and 0.01 parts of dibutyltin dilaurate and stirred at 85°C for 2 hours. The temperature was then lowered to 70°C, 0.3 parts of 1,4-butanediol were added, and the mixture was stirred for 30 minutes. The temperature was then lowered to 55°C, 4 parts of tetrahydrofuran were added to reduce the viscosity, 2.3 parts of water-based chain extender were added, and the mixture was stirred for another 30 minutes. 1.4 parts of 3-aminopropyltriethoxysilane were added, and the mixture was stirred for another 50 minutes. Deionized water was slowly added while stirring at 1000 rpm to form an emulsion. The organic solvent was removed by rotary evaporation, and deionized water was added to obtain a water-based polyurethane emulsion with a solid content of 40 wt%. (3) Disperse the waterborne polyurethane emulsion in deionized water to prepare a waterborne polyurethane slurry with a mass fraction of 2wt%. Impregnate the modified reinforcing fiber A in it for 30 min, take it out and heat cure it at 120℃ for 4 min to obtain the modified reinforcing fiber B. Step 3: Preparation of a room-temperature curing, wind- and sand-erosion-resistant, single-component silicone rubber insulating coating: 100 parts of 10000cs107 silicone oil, 15 parts of multi-claw structure hydroxyl-terminated silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, 30 parts of modified reinforcing fiber B, and 35 parts of modified wear-resistant filler B were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room temperature curing one-component silicone rubber insulating coating. The wear-resistant filler is talc powder; the reinforcing fiber is sepiolite fiber.

[0035] Example 3: A method for preparing a room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion includes the following steps: Step 1: Preparation of modified wear-resistant filler B: (1) Add bis(3-aminopropyl)-terminated polydimethylsiloxane to dichloromethane and mix evenly. Add acryloyl chloride-dichloromethane solution dropwise at 0°C. After the addition is complete, heat to 30°C and stir for 4 hours. Wash, dry, and remove solvent by rotary evaporation to obtain bisacrylamide-terminated polydimethylsiloxane. The raw materials of bisacrylamide-terminated polydimethylsiloxane include bis(3-aminopropyl)-terminated polydimethylsiloxane and acryloyl chloride in a mass ratio of 10:1.9. (2) Add bisacrylamide-terminated polydimethylsiloxane and Tween-80 to deionized water and mix evenly. Add modified wear-resistant filler A and ultrasonically disperse for 30 min. Add diethylenetriamine and mix evenly. Heat to 65℃ and add N,N′-methylenebisacrylamide-water solution dropwise. After the dropwise addition is complete, stir and react for 24 h. Filter, wash, and dry to obtain modified wear-resistant filler B. The raw materials of modified wear-resistant filler B include wear-resistant filler, diethylenetriamine, N,N′-methylenebisacrylamide, and bisacrylamide-terminated polydimethylsiloxane in a mass ratio of 100:7.5:10.3:2.4. Step 2: Preparation of modified reinforcing fiber B: (1) Methyl acrylate is added dropwise to isophorone diamine and stirred at 55°C for 3 hours. Triethylamine-water solution is added and stirred for 0.5 hours. Deionized water is added until the solid content is 40 wt% to obtain an aqueous chain extender. The raw materials of the aqueous chain extender include methyl acrylate, isophorone diamine and triethylamine in a mass ratio of 1:1.97:1.17. (2) Under a nitrogen atmosphere, 16 parts of polyester diol, after dehydration, were mixed with 5.9 parts of isophorone diisocyanate and 0.01 parts of dibutyltin dilaurate and stirred at 85°C for 2 hours. The temperature was then lowered to 70°C, 0.3 parts of 1,4-butanediol were added, and the mixture was stirred for 30 minutes. The temperature was then lowered to 55°C, 4 parts of tetrahydrofuran were added to reduce the viscosity, 2.3 parts of water-based chain extender were added, and the mixture was stirred for another 30 minutes. 1.4 parts of 3-aminopropyltriethoxysilane were added, and the mixture was stirred for another 50 minutes. Deionized water was slowly added while stirring at 1000 rpm to form an emulsion. The organic solvent was removed by rotary evaporation, and deionized water was added to obtain a water-based polyurethane emulsion with a solid content of 40 wt%. (3) Disperse the waterborne polyurethane emulsion in deionized water to prepare a waterborne polyurethane slurry with a mass fraction of 2wt%. Impregnate the modified reinforcing fiber A in it for 30 min, take it out and heat cure it at 120℃ for 4 min to obtain the modified reinforcing fiber B. Step 3: Preparation of a room-temperature curing, wind- and sand-erosion-resistant, single-component silicone rubber insulating coating: 100 parts of 15000cs107 silicone oil, 15 parts of multi-claw structure hydroxyl-terminated silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, 25 parts of modified reinforcing fiber B, and 40 parts of modified wear-resistant filler B were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room-temperature curing one-component silicone rubber insulating coating.

[0036] The wear-resistant filler is mica powder; the reinforcing fiber is wollastonite fiber.

[0037] Example 4: A method for preparing a room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion includes the following steps: Step 1: Preparation of modified wear-resistant filler B: (1) Add bis(3-aminopropyl)-terminated polydimethylsiloxane to dichloromethane and mix evenly. Add acryloyl chloride-dichloromethane solution dropwise at 0°C. After the addition is complete, heat to 30°C and stir for 4 hours. Wash, dry, and remove solvent by rotary evaporation to obtain bisacrylamide-terminated polydimethylsiloxane. The raw materials of bisacrylamide-terminated polydimethylsiloxane include bis(3-aminopropyl)-terminated polydimethylsiloxane and acryloyl chloride in a mass ratio of 10:1.9. (2) Add bisacrylamide-terminated polydimethylsiloxane and Tween-80 to deionized water and mix evenly. Add modified wear-resistant filler A and ultrasonically disperse for 30 min. Add diethylenetriamine and mix evenly. Heat to 65℃ and add N,N′-methylenebisacrylamide-water solution dropwise. After the dropwise addition is complete, stir and react for 24 h. Filter, wash, and dry to obtain modified wear-resistant filler B. The raw materials of modified wear-resistant filler B include wear-resistant filler, diethylenetriamine, N,N′-methylenebisacrylamide, and bisacrylamide-terminated polydimethylsiloxane in a mass ratio of 100:7.5:10.3:2.4. Step 2: Preparation of modified reinforcing fiber B: (1) Methyl acrylate is added dropwise to isophorone diamine and stirred at 55°C for 3 hours. Triethylamine-water solution is added and stirred for 0.5 hours. Deionized water is added until the solid content is 40 wt% to obtain an aqueous chain extender. The raw materials of the aqueous chain extender include methyl acrylate, isophorone diamine and triethylamine in a mass ratio of 1:1.97:1.17. (2) Under a nitrogen atmosphere, 16 parts of polyester diol, after dehydration, were mixed with 5.9 parts of isophorone diisocyanate and 0.01 parts of dibutyltin dilaurate and stirred at 85°C for 2 hours. The temperature was then lowered to 70°C, 0.3 parts of 1,4-butanediol were added, and the mixture was stirred for 30 minutes. The temperature was then lowered to 55°C, 4 parts of tetrahydrofuran were added to reduce the viscosity, 2.3 parts of water-based chain extender were added, and the mixture was stirred for another 30 minutes. 1.4 parts of 3-aminopropyltriethoxysilane were added, and the mixture was stirred for another 50 minutes. Deionized water was slowly added while stirring at 1000 rpm to form an emulsion. The organic solvent was removed by rotary evaporation, and deionized water was added to obtain a water-based polyurethane emulsion with a solid content of 40 wt%. (3) Disperse the waterborne polyurethane emulsion in deionized water to prepare a waterborne polyurethane slurry with a mass fraction of 2wt%. Impregnate the modified reinforcing fiber A in it for 30 min, take it out and heat cure it at 120℃ for 4 min to obtain the modified reinforcing fiber B. Step 3: Preparation of a room-temperature curing, wind- and sand-erosion-resistant, single-component silicone rubber insulating coating: 100 parts of 15000cs107 silicone oil, 30 parts of multi-claw structure hydroxyl-terminated silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, 35 parts of modified reinforcing fiber B, and 50 parts of modified wear-resistant filler B were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room temperature curing one-component silicone rubber insulating coating. The wear-resistant filler is composed of talc powder and mica powder in a mass ratio of 1:1; the reinforcing fiber is composed of sepiolite fiber and wollastonite fiber in a mass ratio of 1:1.

[0038] Comparative Example 1: Based on Example 1, a conventional silicone rubber coating was used, with the remaining processes unchanged, as follows: 100 parts of 10000cs107 silicone oil and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, and 65 parts of aluminum hydroxide powder were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room temperature curing one-component silicone rubber insulating coating.

[0039] Comparative Example 2: Based on Example 1, hydrogen-containing silicone oil was used instead of the multi-claw structure hydroxyl-terminated silicone oil, with the remaining processes unchanged, as follows: 100 parts of 10000cs107 silicone oil, 15 parts of hydrogen-containing silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed evenly at 1000 rpm. Then, 100 parts of xylene, 10 parts of color paste, 30 parts of modified reinforcing fiber A, and 35 parts of modified wear-resistant filler A were added sequentially and stirred at 800 rpm until evenly dispersed. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until evenly dispersed. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room-temperature curing one-component silicone rubber insulating coating. The wear-resistant filler is talc powder; the reinforcing fiber is sepiolite fiber.

[0040] Comparative Example 3: Based on Example 2, the wear-resistant filler was not further modified, and the remaining processes remained unchanged, as follows: Step 1: Preparation of modified reinforcing fiber B: (1) Methyl acrylate is added dropwise to isophorone diamine and stirred at 55°C for 3 hours. Triethylamine-water solution is added and stirred for 0.5 hours. Deionized water is added until the solid content is 40 wt% to obtain an aqueous chain extender. The raw materials of the aqueous chain extender include methyl acrylate, isophorone diamine and triethylamine in a mass ratio of 1:1.97:1.17. (2) Under a nitrogen atmosphere, 16 parts of polyester diol, after dehydration, were mixed with 5.9 parts of isophorone diisocyanate and 0.01 parts of dibutyltin dilaurate and stirred at 85°C for 2 hours. The temperature was then lowered to 70°C, 0.3 parts of 1,4-butanediol were added, and the mixture was stirred for 30 minutes. The temperature was then lowered to 55°C, 4 parts of tetrahydrofuran were added to reduce the viscosity, 2.3 parts of water-based chain extender were added, and the mixture was stirred for another 30 minutes. 1.4 parts of 3-aminopropyltriethoxysilane were added, and the mixture was stirred for another 50 minutes. Deionized water was slowly added while stirring at 1000 rpm to form an emulsion. The organic solvent was removed by rotary evaporation, and deionized water was added to obtain a water-based polyurethane emulsion with a solid content of 40 wt%. (3) Disperse the waterborne polyurethane emulsion in deionized water to prepare a waterborne polyurethane slurry with a mass fraction of 2wt%. Impregnate the modified reinforcing fiber A in it for 30 min, take it out and heat cure it at 120℃ for 4 min to obtain the modified reinforcing fiber B. Step Two: Preparation of a room-temperature curing, wind- and sand-erosion-resistant, single-component silicone rubber insulating coating: 100 parts of 10000cs107 silicone oil, 15 parts of multi-claw structure hydroxyl-terminated silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, 30 parts of modified reinforcing fiber B, and 35 parts of modified wear-resistant filler A were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room temperature curing one-component silicone rubber insulating coating. The wear-resistant filler is talc powder; the reinforcing fiber is sepiolite fiber.

[0041] Comparative Example 4: Based on Example 2, the reinforcing fiber was not further modified, and the remaining processes remained unchanged, as follows: Step 1: Preparation of modified wear-resistant filler B: (1) Add bis(3-aminopropyl)-terminated polydimethylsiloxane to dichloromethane and mix evenly. Add acryloyl chloride-dichloromethane solution dropwise at 0°C. After the addition is complete, heat to 30°C and stir for 4 hours. Wash, dry, and remove solvent by rotary evaporation to obtain bisacrylamide-terminated polydimethylsiloxane. The raw materials of bisacrylamide-terminated polydimethylsiloxane include bis(3-aminopropyl)-terminated polydimethylsiloxane and acryloyl chloride in a mass ratio of 10:1.9. (2) Add bisacrylamide-terminated polydimethylsiloxane and Tween-80 to deionized water and mix evenly. Add modified wear-resistant filler A and ultrasonically disperse for 30 min. Add diethylenetriamine and mix evenly. Heat to 65℃ and add N,N′-methylenebisacrylamide-water solution dropwise. After the dropwise addition is complete, stir and react for 24 h. Filter, wash, and dry to obtain modified wear-resistant filler B. The raw materials of modified wear-resistant filler B include wear-resistant filler, diethylenetriamine, N,N′-methylenebisacrylamide, and bisacrylamide-terminated polydimethylsiloxane in a mass ratio of 100:7.5:10.3:2.4. Step Two: Preparation of a room-temperature curing, wind- and sand-erosion-resistant, single-component silicone rubber insulating coating: 100 parts of 10000cs107 silicone oil, 15 parts of multi-claw structure hydroxyl-terminated silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, 30 parts of modified reinforcing fiber A, and 35 parts of modified wear-resistant filler B were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room temperature curing one-component silicone rubber insulating coating. The wear-resistant filler is talc powder; the reinforcing fiber is sepiolite fiber.

[0042] Comparative Example 5: Based on Example 2, 2,2-dimethylolbutyric acid was used as an aqueous chain extender in the preparation of the modified reinforcing fiber for the waterborne polyurethane, while the rest of the process remained unchanged, as follows: Step 1: Preparation of modified wear-resistant filler B: (1) Add bis(3-aminopropyl)-terminated polydimethylsiloxane to dichloromethane and mix evenly. Add acryloyl chloride-dichloromethane solution dropwise at 0°C. After the addition is complete, heat to 30°C and stir for 4 hours. Wash, dry, and remove solvent by rotary evaporation to obtain bisacrylamide-terminated polydimethylsiloxane. The raw materials of bisacrylamide-terminated polydimethylsiloxane include bis(3-aminopropyl)-terminated polydimethylsiloxane and acryloyl chloride in a mass ratio of 10:1.9. (2) Add bisacrylamide-terminated polydimethylsiloxane and Tween-80 to deionized water and mix evenly. Add modified wear-resistant filler A and ultrasonically disperse for 30 min. Add diethylenetriamine and mix evenly. Heat to 65℃ and add N,N′-methylenebisacrylamide-water solution dropwise. After the dropwise addition is complete, stir and react for 24 h. Filter, wash, and dry to obtain modified wear-resistant filler B. The raw materials of modified wear-resistant filler B include wear-resistant filler, diethylenetriamine, N,N′-methylenebisacrylamide, and bisacrylamide-terminated polydimethylsiloxane in a mass ratio of 100:7.5:10.3:2.4. Step 2: Preparation of modified reinforcing fiber B: (1) Under a nitrogen atmosphere, 16 parts of polyester diol after dehydration, 5.9 parts of isophorone diisocyanate, and 0.01 parts of dibutyltin dilaurate were stirred and reacted at 85°C for 2 hours. The temperature was lowered to 70°C, 0.3 parts of 1,4-butanediol were added, and the mixture was stirred and reacted for 30 minutes. The temperature was lowered to 55°C, 4 parts of tetrahydrofuran were added to reduce the viscosity, 2.3 parts of 2,2-dimethylolbutyric acid were added, and the mixture was stirred and reacted for another 30 minutes. 1.4 parts of 3-aminopropyltriethoxysilane were added, and the mixture was stirred and reacted for another 50 minutes. Deionized water was slowly added under stirring at 1000 rpm to form an emulsion. The organic solvent was removed by rotary evaporation, and deionized water was added to obtain an aqueous polyurethane emulsion with a solid content of 40 wt%. (2) Disperse the waterborne polyurethane emulsion in deionized water to prepare a waterborne polyurethane slurry with a mass fraction of 2wt%. Impregnate the modified reinforcing fiber A in it for 30 min, take it out and heat cure it at 120℃ for 4 min to obtain the modified reinforcing fiber B. Step 3: Preparation of a room-temperature curing, wind- and sand-erosion-resistant, single-component silicone rubber insulating coating: 100 parts of 10000cs107 silicone oil, 15 parts of multi-claw structure hydroxyl-terminated silicone oil, and 10 parts of fumed silica were added to a disperser and dispersed at 1000 rpm until uniform. Then, 100 parts of xylene, 10 parts of color paste, 30 parts of modified reinforcing fiber B, and 35 parts of modified wear-resistant filler B were added sequentially and stirred at 800 rpm until uniform. Then, 5 parts of methyl tributanone oxime silane, 3 parts of 3-aminopropyltriethoxysilane, and 0.2 parts of dibutyltin dilaurate were added and stirred at 500 rpm until uniform. The mixture was discharged, sealed, and packaged in a moisture-proof container to obtain a room temperature curing one-component silicone rubber insulating coating. The wear-resistant filler is talc powder; the reinforcing fiber is sepiolite fiber.

[0043] Performance test: (1) Abrasion resistance: GB / T 1768-2006; Rotary rubber grinding wheel method, under specified conditions, the dry paint film of colored paint or varnish is rubbed with a rubber grinding wheel fixed on the abrasion tester. The wheel model is CS-10, the specification is 500g / wheel; the rotation speed is 60r / min, and the number of revolutions is 500r; (2) Tensile properties: GB / T 528-2009 was adopted; the tensile strength of the sample was tested by a universal tensile testing machine. The sample was a type 3 dumbbell-shaped specimen, and the tensile rate was 200 mm / min. (3) Tear performance: GB / T 529-2008 was adopted; the tear strength of the sample was tested by a universal tensile testing machine. The sample was a right-angled specimen and the tensile rate was 500 mm / min. (4) AC breakdown strength: The breakdown strength of the sample was measured using a breakdown strength test platform built in the laboratory. The electrode was a flat plate electrode with a diameter of 5 mm. The voltage boost mode was AC fast boost with a boost rate of 1 kV / s. The sample thickness was 1 mm. The sample was placed in insulating silicone oil for testing. The experimental data are shown in the table below.

[0044]

[0045] Conclusion: From Figures 1-2 Infrared spectral analysis shows that, compared to hydrogen-containing silicone oil, the prepared multi-claw structure hydroxyl-terminated silicone oil has a higher concentration at 2160 cm⁻¹. -1 The characteristic peaks of the nearby silicon-hydrogen bond (Si-H) have largely disappeared, while the peaks at 3400 cm⁻¹ have also disappeared. -1 The presence of a characteristic peak of hydroxyl (-OH) nearby indicates the successful synthesis of hydroxyl-terminated silicone oil with a multi-claw structure.

[0046] Depend on Figures 3-6 The scanning electron microscope images show that there are tiny particulate deposits on the surfaces of both the wear-resistant filler and the reinforcing fiber, indicating that the KH-550 coupling agent molecules have been successfully grafted onto the surfaces of the filler and the fiber. However, it can also be seen that the simple modification of the coupling agent does not result in uniform and complete coating of the fiber and the filler. Therefore, Example 2, which is further modified, has a significant performance improvement compared to Example 1.

[0047] As shown in the table above, Comparative Example 1 uses conventional silicone rubber coating, which lacks the enhanced wear resistance of wear-resistant fillers and the basic tensile properties of reinforcing fibers. Furthermore, the dispersion of aluminum hydroxide in the matrix is ​​generally poor, resulting in a significant decrease in overall performance compared to Example 1. Comparative Example 2 uses unmodified hydrogen-containing silicone oil, which lacks a multi-claw structure, leading to reduced tear strength and tensile strength. Comparative Examples 3 and 4, compared to Example 2, use only further modified wear-resistant fillers and reinforcing fibers, resulting in varying degrees of performance decline, but still significantly higher than Example 1. This indicates that further modification improves the dispersion and functionality of the wear-resistant fillers and reinforcing fibers, creating an excellent synergistic effect and enhancing overall performance. Meanwhile, in Comparative Example 4, the reinforcing fibers, lacking further modification, have limited coating coverage on the sepiolite fibers. Due to their still high hygroscopicity, they compete with the moisture required for curing, leading to uneven curing and decreased mechanical properties. In the preparation of the modified reinforcing fiber in Comparative Example 5, 2,2-dihydroxymethylbutyric acid was used as an aqueous chain extender in the waterborne polyurethane. Since 2,2-dihydroxymethylbutyric acid has a small molecular structure, a larger amount of material is required for the same emulsification performance. However, the increased carboxyl content leads to poor compatibility with the silicone rubber matrix, which increases the brittleness of the rubber, reduces the tear resistance, and the increased carboxyl content also reduces the insulation performance.

[0048] In summary, this invention significantly improves the mechanical properties of silicone rubber materials, such as tear resistance and tensile strength, by introducing multi-claw structure hydroxyl-terminated silicone oil, modified reinforcing fibers, and modified wear-resistant fillers into the 107 silicone oil system. It also significantly improves wear resistance and electrical insulation properties, solving the problem of traditional silicone rubber's susceptibility to wear and failure in windy and sandy environments. Furthermore, this invention is convenient to apply and widely applicable. While maintaining the single-component room temperature curing characteristics, the cured coating exhibits excellent adhesion, hydrophobicity, and weather resistance, making it suitable for harsh environments requiring electrical equipment protection, such as outdoor and high-altitude operations.

[0049] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion, characterized in that: The product contains the following raw materials, by weight: 100 parts silicone oil, 10-30 parts multi-claw structure hydroxyl-terminated silicone oil, 20-40 parts reinforcing fiber, 30-50 parts wear-resistant filler, 5-10 parts reinforcing filler, 100-110 parts solvent, 3-8 parts crosslinking agent, 0.2-0.3 parts catalyst, 2-3 parts adhesion promoter, and 5-6 parts color paste.

2. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 1, characterized in that: The preparation method of the multi-claw structure hydroxyl-terminated silicone oil includes the following steps: under a nitrogen atmosphere, hydrogen-containing silicone oil and multi-hydroxyl MQ type silicone resin are mixed, heated to 120~125℃, Pt-divinyltetramethyldisiloxane is added, and the mixture is stirred for 100~120 min to obtain the multi-claw structure hydroxyl-terminated silicone oil.

3. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 2, characterized in that: The raw materials for the multi-claw structure hydroxyl-terminated silicone oil include hydrogen-containing silicone oil, multi-hydroxyl MQ type silicone resin, and Pt-divinyltetramethyldisiloxane in a mass ratio of 100:5~10:0.2~0.

3.

4. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 1, characterized in that: The silicone oil includes 107 silicone oil with a viscosity of 5000~30000 cs.

5. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 1, characterized in that: The wear-resistant filler includes one or two of talc powder and mica powder; the reinforcing fiber includes one or two of sepiolite fiber and wollastonite fiber.

6. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 5, characterized in that: The wear-resistant filler and reinforcing fiber are modified with silane coupling agent to obtain modified wear-resistant filler A and modified reinforcing fiber A, which are then used in room temperature curing single-component silicone rubber insulating coatings. The silane coupling agent includes 3-aminopropyltriethoxysilane.

7. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 6, characterized in that: The wear-resistant filler is modified with a silane coupling agent and then end-capped with bisacrylamide polydimethylsiloxane to obtain modified wear-resistant filler B, which is then used in room temperature curing single-component silicone rubber insulating coatings. The preparation method of the modified wear-resistant filler B includes the following steps: modifying the wear-resistant filler with a silane coupling agent to obtain modified wear-resistant filler A; ultrasonically dispersing the modified wear-resistant filler A in deionized water, sequentially adding bisacrylamide-terminated polydimethylsiloxane, emulsifier, and diethylenetriamine, mixing evenly, heating to 60~65℃, adding N,N′-methylenebisacrylamide-aqueous solution dropwise, stirring and reacting for 20~24 hours; filtering, washing, and drying to obtain modified wear-resistant filler B; The raw materials for the modified wear-resistant filler B include modified wear-resistant filler A, diethylenetriamine, N,N′-methylenebisacrylamide, and bisacrylamide-terminated polydimethylsiloxane in a mass ratio of 100:7.4~7.6:10.2~10.4:2.3~2.

5.

8. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 6, characterized in that: The reinforcing fibers are modified with a silane coupling agent; Then, waterborne polyurethane is used to obtain modified reinforcing fiber B, which is then used in room temperature curing single-component silicone rubber insulating coating; The preparation of the modified reinforcing fiber B includes the following steps: (1) Methyl acrylate is added dropwise to isophorone diamine, and the mixture is stirred at 50~60℃ for 3~4h. Triethylamine-water solution is added, and the mixture is stirred for 0.5~1h. Deionized water is added until the solid content is 30~40wt% to obtain an aqueous chain extender; (2) Silane coupling agent is used to modify the reinforcing fiber to obtain modified reinforcing fiber A; the aqueous chain extender is used to prepare an aqueous polyurethane emulsion, and the aqueous polyurethane emulsion is prepared into an aqueous polyurethane slurry with 1~3wt% using deionized water; The modified reinforcing fiber A is immersed in it for 20-30 minutes, and then removed and heat-cured at 120-125℃ for 3-5 minutes to obtain the modified reinforcing fiber B.

9. The room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to claim 8, characterized in that: The raw materials for the aqueous chain extender include methyl acrylate, isophorone diamine, and triethylamine in a mass ratio of 1:1.95~2:1.17~1.

18. The solid content of the waterborne polyurethane slurry is 1~3wt%.

10. The method for preparing a room-temperature curing, single-component silicone rubber insulating coating resistant to wind and sand erosion according to any one of claims 1 to 9, characterized in that: The process includes the following steps: mixing silicone oil, multi-claw structure hydroxyl-terminated silicone oil, and reinforcing filler, and dispersing by stirring at 1000~1200 rpm; sequentially adding solvent, color paste, reinforcing fiber, and wear-resistant filler, and dispersing by stirring at 600~800 rpm; sequentially adding crosslinking agent, adhesion promoter, and catalyst, and dispersing by stirring at 400~500 rpm; discharging, sealing, and packaging to obtain a room temperature curing single-component silicone rubber insulating coating.

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