Single-component silicone rubber-based anti-icing coating for power transmission line of power system as well as preparation method and application of single-component silicone rubber-based anti-icing coating

Abstract

The invention discloses a single-component silicone rubber-based anti-icing coating for a power transmission line of a power system. The single-component silicone rubber-based anti-icing coating is prepared from the following raw materials in parts by weight: 100 parts of room-temperature vulcanized silicone rubber, 5-15 parts of a cross-linking agent, 0.2-0.8 part of a catalyst, 20-40 parts of a reinforcing agent, 25-40 parts of a flame retardant, 10-30 parts of silicone oil and 100-200 parts of a diluent. The invention also discloses a preparation method and application of the coating. According to the coating, hydrophobic, tackifying and anti-aging components are introduced, so that the single-component silicone rubber-based anti-icing coating with low surface adhesive force, stable structure and excellent adhesive force is designed, and the comprehensive performance of the coating is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of insulating coatings in the electric power industry, and specifically relates to a one-component silicone rubber-based anti-icing coating for power system transmission lines, and a preparation method and application thereof. Background Art

[0002] Ice and snow accumulation is a very common natural phenomenon, and there are many types, such as sleet ice, mixed frost ice, ice fog ice, hoarfrost, snow accumulation, etc. Severe ice and snow accumulation will pose a certain threat and harm to social life. As a basic industry for the national economy and people's livelihood, the rapid development of the power industry has made the safe operation of the power grid particularly important. The environment in which the transmission lines are located is complex and diverse, and will be affected by various environmental factors. Especially in the cold winter, the transmission lines in the high humidity and low temperature environment are very susceptible to ice.

[0003] Anti-icing coating technology has the advantages of low energy consumption, environmental protection, and high economic value, and is becoming increasingly important. At present, there are many coating anti-icing technologies, among which superhydrophobic coating technology is a widely used technology, but its surface structure is fragile and easily damaged, affecting the icing effect. Superlubricating coating technology is based on the pitcher plant in nature as a bionic material object, using a micro-nano porous structure as a structural lock, and injecting hydrophobic liquid materials in different ways to fill the pore structure to form a surface coating with low adhesion. The superhydrophobic coating structure replaces the contact between gas and liquid with the contact between liquid and liquid. Summary of the invention

[0004] In view of the problems of high energy consumption, low deicing efficiency, environmental pollution, easy structural damage, easy coating shedding, etc. existing in the active deicing method and super hydrophobic coating deicing method in the prior art, the present invention provides a one-component silicone rubber-based anti-icing coating for power system transmission lines. By introducing hydrophobic, viscosity-increasing, anti-aging and other components, a one-component silicone rubber-based anti-icing coating with low surface adhesion, stable structure and excellent adhesion is designed, and the comprehensive performance of the coating is improved.

[0005] The present invention also provides a method for preparing the above-mentioned one-component silicone rubber-based anti-icing coating.

[0006] The present invention also provides application of the above-mentioned one-component silicone rubber-based anti-icing coating in power insulator coating.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention provides a one-component silicone rubber-based anti-icing coating for transmission lines in a power system, comprising the following raw materials in parts by weight: 100 parts of room temperature vulcanized silicone rubber, 5-15 parts of a crosslinking agent, 0.2-0.8 parts of a catalyst, 20-40 parts of a reinforcing agent, 25-40 parts of a flame retardant, 10-30 parts of silicone oil, and 100-200 parts of a diluent.

[0008] Preferably, the room temperature vulcanized silicone rubber is composed of hydroxyl-terminated polydimethylsiloxane A and hydroxyl-terminated polydimethylsiloxane B; The mass fraction of the hydroxyl-terminated polydimethylsiloxane A is 50%, and the viscosity is 10000-30000 mPa·s; The mass fraction of the hydroxyl-terminated polydimethylsiloxane B is 50%, and the viscosity is 500-1000 mPa·s.

[0009] Modification method of hydroxyl-terminated polydimethylsiloxane B: Mix xylene, epoxy resin E51, KH550 silane coupling agent, and hydroxyl-terminated polydimethylsiloxane B according to a mass ratio of 30:1:1:25-50, and perform mixing treatment at 85 °C for 5-7 h to obtain hydroxyl-terminated polydimethylsiloxane B. Purpose: Introduce epoxy resin to improve the adhesion performance of the coating system to the substrate.

[0010] The crosslinking agent used in the present invention is one or more of methyltributanone oxime silane, methyltriacetone oxime silane, vinyl butanone oxime silane, phenyltributanone oxime silane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-glycidyl ether oxypropyltrimethoxysilane, vinyltriethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0011] Further, the catalyst is one or more of dibutyltin dilaurate, dioctyltin dilaurate, dibutyl dimethoxysilane, dibutyl diacetyltin, and stannous octoate.

[0012] Further, the reinforcing agent is composed of fumed silica and precipitated silica according to a mass ratio of 1:2.

[0013] Preferably, the particle size of the above-mentioned fumed silica is 50-60 nm; the particle size of the precipitated silica is 1-3 μm, and the porosity is greater than 80%. Among them, the treatment method of mesoporous silica is: Mix mesoporous silica and silicone oil according to a mass ratio of 5:1-3, and then keep it under vacuum conditions for 24 h.

[0014] Further, the flame retardant is one or more of alumina, tetrabromophthalic anhydride, tetrabromoether, decabromodiphenyl ether, and decabromodiphenylethane.

[0015] The method for treating alumina is as follows: the mass ratio of alumina to terminal hydroxyl dimethyl silicone oil is 10:0.5 - 2. Through mixing and grinding treatment, it is baked in a high-temperature oven at 100 - 120 °C for 3 - 5 h, and then cooled to room temperature. The purpose of this treatment method is to improve the compatibility between the powder material and the system, prevent sedimentation during storage, and better achieve the uniformity of the coating system and the coating function.

[0016] Furthermore, the diluent is one or more of petroleum ether, toluene, xylene, n-heptane, n-hexane, ethyl acetate, butyl acetate, methyl ethyl ketone, acetone, methyl isobutyl ketone, trichloroethylene, and tetrachloroethylene.

[0017] Furthermore, the silicone oil is composed of dimethyl silicone oil and methyl fluorosilicone oil in a mass ratio of 1:1; the viscosity of the above-mentioned dimethyl silicone oil is 1000 - 3000 mPa·s; the viscosity of methyl fluorosilicone oil is 500 - 1000 mPa·s.

[0018] The present invention also provides a preparation method for a one-component silicone rubber-based anti-icing coating for transmission lines in the power system, including the following steps: (1) Room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant are initially mixed for 4 - 6 h through a kneading machine to obtain a preliminarily mixed rubber; (2) Then the above-mentioned preliminarily mixed rubber is fully ground for 1 - 2 h through a horizontal grinder to obtain a uniform base rubber; (3) The base rubber is vacuum kneaded and mixed at 100 - 150 °C for 2 - 3 h to obtain a hot rubber; (4) After the hot rubber is cooled, silicone oil is added, and after being stirred evenly at high speed, it is again vacuum kneaded and mixed at 100 - 150 °C for 1 - 2 h; (5) After cooling in (4), diluent is added, and after being stirred evenly at high speed, cross-linking agent and catalyst are added, and they are fully mixed and stirred for 3 - 5 h, and then packaged in an airtight manner to obtain a one-component silicone rubber-based anti-icing coating.

[0019] The present invention also provides an application of the above-mentioned one-component silicone rubber-based anti-icing coating in the coating of power insulators.

[0020] The one-component silicone rubber-based anti-icing coating and its coating of the present invention have outstanding comprehensive performance and have the following characteristics: (1) The formula provided by the present invention can significantly improve the hydrophobic stability and hydrophobic performance of the coating; (2) By adding small molecule silicone oil, the present invention can also act as a migrator. The internal small molecule chain silicone oil can achieve structure supplementation when the coating loses its structure due to ice coating. (3)Under the synergistic effect of each raw material, the present invention has self-cleaning and moisture-proof functions, which can avoid surface fouling and water accumulation on the silicone rubber coating. Detailed implementation manners

[0021] The technical solution of the present invention will be further explained and illustrated through specific embodiments below. It should be noted that the raw materials used in the present invention are all commercially available unless otherwise specified.

[0022] Unless otherwise specified in the embodiments: The mass fraction of hydroxyl-terminated polydimethylsiloxane A is 50%.

[0023] The mass fraction of hydroxyl-terminated polydimethylsiloxane B is 50%, and the modification treatment method is as follows: Xylene, epoxy resin E51, KH550 silane coupling agent, and hydroxyl-terminated polydimethylsiloxane B are mixed at a mass ratio of 30:1:1:30 and treated at 85 °C for 6 h to obtain hydroxyl-terminated polydimethylsiloxane B.

[0024] The particle size of fumed silica is 50 - 60 nm; the particle size of precipitated silica is 1 - 3 μm, and the precipitated silica is mesoporous silica with a porosity of 92%. The treatment method of mesoporous silica is as follows: Mesoporous silica and dimethyl silicone oil (1000 mPa·s) are mixed at a mass ratio of 5:2, and then kept under vacuum for 24 h.

[0025] The treatment method of alumina is as follows: The mass ratio of alumina to hydroxyl-terminated dimethyl silicone oil is 10:1. Through mixing and grinding treatment, it is baked in a high-temperature oven at 100 °C for 4 h, and then cooled to room temperature.

[0026] Example 1 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa·s), 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa·s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica), 30 parts of flame retardant (25 parts of alumina, 5 parts of decabromodiphenyl ether), 30 parts of silicone oil (15 parts of dimethyl silicone oil (1000 mPa·s), 15 parts of methylfluorosilicone oil (500 mPa·s)), and 200 parts of diluent butyl acetate.

[0027] The specific preparation method is as follows: (1) The room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant are preliminarily mixed in a mixing machine for 4 hours to obtain a preliminary mixed rubber; (2) The above-mentioned preliminary mixed rubber is then passed through a horizontal grinder and fully ground for 2 h to obtain a uniform base rubber; (3) kneading and mixing the base rubber at 150 °C in vacuum for 3 h to obtain hot glue; (4) After the hot glue is cooled, silicone oil is added, and after high-speed stirring, the mixture is kneaded and mixed again at 100 °C in vacuum for 1 h; (5) After cooling (4), add the diluent, stir at high speed to make it uniform, then add the crosslinking agent and catalyst, mix and stir thoroughly for 3 h, and then seal off from air and package to obtain a single-component silicone rubber-based anti-icing coating.

[0028] The above coating was sprayed on the glass and cured at 25 °C for 24 h. Then, the hydrophobic angle, adhesion, anti-icing performance and flame retardant grade of the coating were tested and the test results are shown in Table 1. It can be seen that the coating has good comprehensive performance, hydrophobic angle>120°, adhesion circle method level 1, flame retardant grade FV-1, average ice adhesion 2.3 N, and relative ice delay time 520 s.

[0029] Example 2 Coating formula: 100 parts of room temperature vulcanized silicone rubber (50 parts of terminal hydroxyl polydimethylsiloxane A (15000 mPa.s) and 50 parts of terminal hydroxyl polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane and 3 parts of γ-glycidyloxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 parts of dibutyltin dilaurate and 0.2 parts of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica and 20 parts of precipitated silica), 30 parts of flame retardant (25 parts of alumina and 5 parts of decabromodiphenyl ether), 20 parts of silicone oil (10 parts of dimethyl silicone oil (1000 mPa.s) and 10 parts of methylfluorosilicone oil (500 mPa.s)), and 200 parts of diluent butyl acetate.

[0030] The specific preparation method is: (1) The room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant are preliminarily mixed in a mixing machine for 4 hours to obtain a preliminary mixed rubber; (2) The above-mentioned preliminary mixed rubber is then passed through a horizontal grinder and fully ground for 2 h to obtain a uniform base rubber; (3) kneading and mixing the base rubber at 150 °C in vacuum for 3 h to obtain hot glue; (4) After the hot glue is cooled, silicone oil is added, and after high-speed stirring, the mixture is kneaded and mixed again at 110 °C in vacuum for 1 h; (5) After cooling in (4), diluent is added. After stirring evenly at high speed, crosslinking agent and catalyst are added, and they are fully mixed and stirred for 2 h. Then, it is packaged under air isolation to obtain a one-component silicone rubber-based anti-icing coating.

[0031] The above coating is sprayed on glass and cured at 25 °C for 24 h. Then, the test results of the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade of the coating are shown in Table 1. It can be seen that the coating has good comprehensive performance, with a hydrophobic angle > 110 º, adhesion class 1 by the cross-cut method, flame retardant grade FV-1, average ice adhesion force of 3.9 N, and relative ice formation delay time of 460 s.

[0032] Example 3 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa·s) and 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa·s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate and 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica and 20 parts of precipitated silica), 30 parts of flame retardant (25 parts of alumina and 5 parts of decabromodiphenyl ether), 10 parts of silicone oil (5 parts of dimethyl silicone oil (1000 mPa·s) and 5 parts of methylfluorosilicone oil (500 mPa·s)), and 200 parts of diluent butyl acetate.

[0033] The specific preparation method is as follows: (1) Room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant are initially mixed for 4 h through a kneading machine to obtain a preliminarily mixed rubber. (2) Then, the above preliminarily mixed rubber is fully ground for 2 h through a horizontal grinder to obtain a uniform base rubber. (3) The base rubber is vacuum kneaded and mixed at 130 °C for 3 h to obtain a hot rubber. (4) After the hot rubber is cooled, silicone oil is added. After stirring evenly at high speed, it is vacuum kneaded and mixed again at 100 °C for 1 h. (5) After cooling in (4), diluent is added. After stirring evenly at high speed, crosslinking agent and catalyst are added, and they are fully mixed and stirred for 2 h. Then, it is packaged under air isolation to obtain a one-component silicone rubber-based anti-icing coating.

[0034] Spray the above-mentioned coating on the glass and cure it at 25 °C for 24 h. Then, the test results of the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade of the coating are shown in Table 1. It can be seen that the coating has good comprehensive performance, with a hydrophobic angle > 95 º, a scribing adhesion grade of 1, a flame retardant grade of FV-1, an average ice adhesion force of 5 N, and a relative ice formation delay time of 400 s.

[0035] Comparative Example 4 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa·s) and 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa·s)), 9 parts of cross-linking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidoxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate and 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica and 20 parts of precipitated silica), 30 parts of flame retardant (25 parts of alumina and 5 parts of decabromodiphenyl ether), and 200 parts of diluent butyl acetate.

[0036] The specific preparation method is as follows: (1) Mix the room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant in a kneading machine for 4 h to obtain a preliminary mixed rubber. (2) Then, grind the above-mentioned preliminary mixed rubber in a horizontal grinder for 2 h to obtain a uniform base rubber. (3) Knead and mix the base rubber in a vacuum at 130 °C for 3 h to obtain a hot rubber. (4) After stirring the hot rubber evenly at high speed, knead and mix it in a vacuum at 100 °C for 1 h. (5) After cooling the product in step (4), add the diluent, stir evenly at high speed, then add the cross-linking agent and catalyst, mix and stir thoroughly for 2 h, and then package it in an airtight manner to obtain a one-component silicone rubber-based coating.

[0037] Spray the above-mentioned coating on the glass and cure it at 25 °C for 24 h. Then, the test results of the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade of the coating are shown in Table 1. The hydrophobic angle > 80 º, the scribing adhesion grade is 2, the flame retardant grade is FV-2, the average ice adhesion force > 10 N, and the relative ice formation delay time is 100 s.

[0038] Comparative Example 5 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa.s), 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidoxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica), 30 parts of flame retardant (25 parts of alumina, 5 parts of decabromodiphenyl ether), 10 parts of silicone oil (10 parts of dimethyl silicone oil (1000 mPa.s)), 200 parts of diluent butyl acetate.

[0039] The specific preparation method is as follows: (1) Mix the room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant in a kneading machine for 4 h to obtain a preliminary mixed rubber. (2) Then, grind the above preliminary mixed rubber in a horizontal grinder for 2 h to obtain a uniform base rubber. (3) Knead and mix the base rubber in a vacuum at 130 °C for 3 h to obtain a hot rubber. (4) After cooling the hot rubber, add silicone oil, stir evenly at high speed, and then knead and mix in a vacuum at 100 °C for 1 h again. (5) Add the diluent to the cooled mixture in (4), stir evenly at high speed, then add the crosslinking agent and catalyst, mix and stir thoroughly for 2 h, and then package it in an airtight manner to obtain a one-component silicone rubber-based coating.

[0040] Spray the above coating on the glass and cure it at 25 °C for 24 h. Then, the test results of the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade of the coating are shown in Table 1. The hydrophobic angle > 85 º, the adhesion is grade 2 by the cross-cut method, the flame retardant grade is FV-1, the average ice adhesion force is 8.2 N, and the relative ice formation delay time is 230 s.

[0041] Comparative Example 6 Coating formula: 100 parts of room temperature vulcanized silicone rubber (50 parts of terminal hydroxyl polydimethylsiloxane A (15000 mPa.s) and 50 parts of terminal hydroxyl polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane and 3 parts of γ-glycidyloxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 parts of dibutyltin dilaurate and 0.2 parts of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica and 20 parts of precipitated silica), 30 parts of flame retardant (25 parts of alumina and 5 parts of decabromodiphenyl ether), 10 parts of silicone oil (10 parts of methyl fluorosilicone oil (500mPa.s)) and 200 parts of diluent butyl acetate.

[0042] The specific preparation method is: (1) The room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant are preliminarily mixed in a mixing machine for 4 hours to obtain a preliminary mixed rubber; (2) Then the above preliminary mixed rubber is passed through a horizontal grinder and fully ground for 2 hours to obtain a uniform base rubber; (3) kneading and mixing the base rubber at 130 °C in vacuum for 3 h to obtain hot glue; (4) After the hot glue is cooled, silicone oil is added, and after high-speed stirring, the mixture is kneaded and mixed again at 100 °C in vacuum for 1 h; (5) After cooling (4), add the diluent, stir at high speed to make it uniform, then add the crosslinking agent and catalyst, mix and stir thoroughly for 2 h, and then seal off from air and package to obtain a one-component silicone rubber-based coating.

[0043] The above coating was sprayed on the glass and cured at 25 °C for 24 h. Then, the hydrophobic angle, adhesion, anti-icing performance and flame retardant grade of the coating were tested and the test results are shown in Table 1. The hydrophobic angle is >88°, the adhesion circle method is level 2, the flame retardant grade is FV-1, the average ice adhesion is 7.8 N, and the relative ice delay time is 200 s.

[0044] The performance test results of Examples 1-3 and Comparative Examples 4-6 are specifically shown in Table 1.

[0045] Table 1 Comparison of comprehensive properties of coatings obtained in Examples 1-3 and Comparative Examples 4-6 Example 7 Coating formula: 100 parts of room temperature vulcanized silicone rubber (50 parts of terminal hydroxyl polydimethylsiloxane A (15000 mPa.s) and 50 parts of terminal hydroxyl polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane and 3 parts of γ-glycidyloxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 parts of dibutyltin dilaurate and 0.2 parts of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica and 20 parts of precipitated silica), 40 parts of flame retardant (35 parts of alumina and 5 parts of decabromodiphenyl ether), 30 parts of silicone oil (15 parts of dimethyl silicone oil (1000 mPa.s) and 15 parts of methylfluorosilicone oil (500 mPa.s)), and 200 parts of diluent butyl acetate.

[0046] The specific preparation method is: (1) The room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant are preliminarily mixed in a mixing machine for 4 hours to obtain a preliminary mixed rubber; (2) The above-mentioned preliminary mixed rubber is then passed through a horizontal grinder and fully ground for 2 h to obtain a uniform base rubber; (3) kneading and mixing the base rubber at 150 °C in vacuum for 3 h to obtain hot glue; (4) After the hot glue is cooled, silicone oil is added, and after high-speed stirring, the mixture is kneaded and mixed again at 100 °C in vacuum for 1 h; (5) After cooling (4), add the diluent, stir at high speed to make it uniform, then add the crosslinking agent and catalyst, mix and stir thoroughly for 3 h, and then seal off from air and package to obtain a single-component silicone rubber-based anti-icing coating.

[0047] The above coating was sprayed on the glass and cured at 25℃ for 24h. Then, the hydrophobic angle, adhesion, anti-icing performance and flame retardant grade of the coating were tested and the test results are shown in Table 1. It can be seen that the coating has good comprehensive performance, hydrophobic angle>125°, adhesion circle method level 1, flame retardant grade FV-0, average ice adhesion 2.1N, and relative ice delay time 600s.

[0048] Example 8 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa.s) and 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica), 25 parts of flame retardant (20 parts of alumina, 5 parts of decabromodiphenyl ether), 30 parts of silicone oil (15 parts of dimethyl silicone oil (1000 mPa.s), 15 parts of methylfluorosilicone oil (500 mPa.s)), and 200 parts of diluent butyl acetate.

[0049] The specific preparation method is as follows: (1) Mix the room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant in a kneading machine for 4 h to obtain a preliminary mixed rubber. (2) Then grind the above preliminary mixed rubber in a horizontal grinder for 2 h to obtain a uniform base rubber. (3) Knead and mix the base rubber in a vacuum at 150 °C for 3 h to obtain a hot rubber. (4) After cooling the hot rubber, add silicone oil, stir evenly at high speed, and then knead and mix in a vacuum at 100 °C for 1 h again. (5) After cooling in (4), add diluent, stir evenly at high speed, then add crosslinking agent and catalyst, mix and stir thoroughly for 3 h, and then package in an airtight manner to obtain a one-component silicone rubber-based anti-icing coating.

[0050] Spray the above coating on glass and cure it at 25 °C for 24 h. Then, the test results of the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade of the coating are shown in Table 1. It can be seen that the coating has good comprehensive performance, with a hydrophobic angle > 113 º, a scribing adhesion level of 1, a flame retardant grade of FV-0, an average ice adhesion force of 3.2 N, and a relative ice formation delay time of 500 s.

[0051] Example 9 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa.s) and 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica), 10 parts of flame retardant (5 parts of alumina, 5 parts of decabromodiphenyl ether), 30 parts of silicone oil (15 parts of dimethyl silicone oil (1000 mPa.s), 15 parts of methylfluorosilicone oil (500 mPa.s)), 200 parts of diluent butyl acetate.

[0052] The specific preparation method is as follows: (1) Mix the room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant in a kneading machine for 4 h to obtain a preliminary mixed rubber. (2) Then grind the above preliminary mixed rubber in a horizontal grinder for 2 h to obtain a uniform base rubber. (3) Knead and mix the base rubber in a vacuum at 150 °C for 3 h to obtain a hot rubber. (4) After cooling the hot rubber, add silicone oil, stir evenly at high speed, and then knead and mix in a vacuum at 100 °C for 1 h again. (5) Add the diluent to the cooled mixture in step (4), stir evenly at high speed, then add the crosslinking agent and catalyst, mix and stir thoroughly for 3 h, and then package it in an airtight manner to obtain a one-component silicone rubber-based anti-icing coating.

[0053] Spray the above coating on the glass and cure it at 25 °C for 24 h. Then, the test results of the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade of the coating are shown in Table 1. It can be seen that the coating has good comprehensive performance, with a hydrophobic angle > 105 º, a 1-level adhesion by the cross-cut method, a flame retardant grade of FV-2, an average ice adhesion force of 4.5 N, and a relative ice formation delay time of 310 s.

[0054] Comparative Example 10 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa.s) and 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica), 200 parts of diluent butyl acetate.

[0055] The specific preparation method is as follows: (1) Room temperature vulcanized silicone rubber, reinforcing agent are preliminarily mixed for 4 h through a kneading machine to obtain a preliminarily mixed rubber; (2) Then the above preliminarily mixed rubber is fully ground for 2 h through a horizontal grinder to obtain a uniform base rubber; (3) The base rubber is vacuum kneaded and mixed at 150 °C for 3 h to obtain a hot rubber; (4) After cooling the rubber obtained in (3), a diluent is added, and after stirring evenly at high speed, a crosslinking agent and a catalyst are added, and they are fully mixed and stirred for 3 h, and then packaged in an airtight manner to obtain a one-component silicone rubber base coating.

[0056] The above coating is sprayed on glass and cured at 25 °C for 24 h. Then, the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade test results are shown in Table 1. The hydrophobic angle > 80 º, the adhesion is grade 3 by the circle method, the flame retardant grade is FV-2, the average ice adhesion force > 15 N, and the relative ice formation delay time is 60 s.

[0057] Comparative Example 11 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa·s), 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa·s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica), 10 parts of flame retardant (5 parts of alumina (untreated), 5 parts of decabromodiphenyl ether), 30 parts of silicone oil (15 parts of dimethyl silicone oil (1000 mPa·s), 15 parts of methylfluorosilicone oil (500 mPa·s)), 200 parts of diluent butyl acetate.

[0058] The specific preparation method is as follows: (1) Room temperature vulcanized silicone rubber, reinforcing agent, flame retardant are preliminarily mixed for 4 h through a kneading machine to obtain a preliminarily mixed rubber; (2) Then the above preliminarily mixed rubber is fully ground for 2 h through a horizontal grinder to obtain a uniform base rubber; (3) The base rubber is vacuum kneaded and mixed at 150 °C for 3 h to obtain a hot rubber; (4) After cooling the hot rubber, silicone oil is added, and after stirring evenly at high speed, it is vacuum kneaded and mixed at 100 °C for 1 h again; (5) After cooling in (4), diluent was added. After stirring evenly at high speed, crosslinking agent and catalyst were added, and the mixture was stirred thoroughly for 3 h. Then, it was packaged in an airtight manner to obtain a one-component silicone rubber-based coating.

[0059] The above coating was sprayed on glass and cured at 25 °C for 24 h. Then, the hydrophobic angle, adhesion, anti-icing performance, and flame retardancy rating of the coating were tested. The test results are shown in Table 1. The hydrophobic angle > 100 º, the adhesion was grade 2 by the crosshatch method, the flame retardancy rating was FV-2, the average ice adhesion force was 6.2 N, and the relative ice formation delay time was 260 s.

[0060] Comparative Example 12 Coating formulation: 100 parts of room temperature vulcanizing silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa.s) and 50 parts of hydroxyl-terminated polydimethylsiloxane B (untreated, mass fraction 50%, 500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica), 10 parts of flame retardant (5 parts of alumina, 5 parts of decabromodiphenyl ether), 30 parts of silicone oil (30 parts of dimethyl silicone oil (1000 mPa.s)), and 200 parts of diluent butyl acetate.

[0061] The specific preparation method is as follows: (1) Room temperature vulcanizing silicone rubber, reinforcing agent, and flame retardant were initially mixed for 4 h through a kneading machine to obtain a preliminarily mixed rubber. (2) Then, the above preliminarily mixed rubber was thoroughly ground for 2 h through a horizontal grinder to obtain a uniform base rubber. (3) The base rubber was vacuum kneaded and mixed at 150 °C for 3 h to obtain a hot rubber. (4) After the hot rubber was cooled, silicone oil was added. After stirring evenly at high speed, it was vacuum kneaded and mixed again at 100 °C for 1 h. (5) After cooling in (4), diluent was added. After stirring evenly at high speed, crosslinking agent and catalyst were added, and the mixture was stirred thoroughly for 3 h. Then, it was packaged in an airtight manner to obtain a one-component silicone rubber-based coating.

[0062] The above coating was sprayed on glass and cured at 25 °C for 24 h. Then, the hydrophobic angle, adhesion, anti-icing performance, and flame retardancy rating of the coating were tested. The test results are shown in Table 1. It can be seen that the coating has good comprehensive performance, the hydrophobic angle > 86 º, the adhesion was grade 2 by the crosshatch method, the flame retardancy rating was FV-2, the average ice adhesion force was 8.9 N, and the relative ice formation delay time was 190 s.

[0063] Comparative Example 13 Coating formulation: 100 parts of room temperature vulcanized silicone rubber (50 parts of hydroxyl-terminated polydimethylsiloxane A (15000 mPa.s) and 50 parts of hydroxyl-terminated polydimethylsiloxane B (500 mPa.s)), 9 parts of crosslinking agent (3 parts of γ-aminopropyltriethoxysilane, 3 parts of γ-aminopropyltrimethoxysilane, 3 parts of γ-glycidyletheroxypropyltrimethoxysilane), 0.3 parts of catalyst (0.1 part of dibutyltin dilaurate, 0.2 part of dioctyltin dilaurate), 40 parts of reinforcing agent (20 parts of fumed silica, 20 parts of precipitated silica (untreated)), 10 parts of flame retardant (5 parts of alumina, 5 parts of decabromodiphenyl ether), 30 parts of silicone oil (15 parts of dimethyl silicone oil (1000 mPa.s), 15 parts of methylfluorosilicone oil (500 mPa.s)), and 200 parts of diluent butyl acetate.

[0064] The specific preparation method is as follows: (1) Mix the room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant in a kneading machine for 4 h to obtain a preliminary mixed rubber. (2) Then grind the above-mentioned preliminary mixed rubber in a horizontal grinder for 2 h to obtain a uniform base rubber. (3) Knead and mix the base rubber in a vacuum at 150 °C for 3 h to obtain a hot rubber. (4) After cooling the hot rubber, add silicone oil, stir evenly at high speed, and then knead and mix in a vacuum at 100 °C for 1 h again. (5) After cooling in (4), add diluent, stir evenly at high speed, then add crosslinking agent and catalyst, mix and stir thoroughly for 3 h, and then package in an airtight manner to obtain a one-component silicone rubber base coating.

[0065] Spray the above coating on glass and cure it at 25 °C for 24 h. Then, the test results of the hydrophobic angle, adhesion, anti-icing performance, and flame retardant grade of the coating are shown in Table 1. The hydrophobic angle is 96 °, the adhesion by the cross-cut method is grade 2, the flame retardant grade is FV-2, the average ice adhesion force is 6.4 N, and the relative ice formation delay time is 180 s.

[0066] The performance test results of Examples 7-9 and Comparative Examples 10-13 are specifically shown in Table 2.

[0067] Table 2 Comparison of the comprehensive performance of the coatings obtained in Examples 7-9 and Comparative Examples 10-13 The above are only the preferred specific embodiments of the present invention, but the protection scope of the invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A single-component silicone rubber-based anti-icing coating for transmission lines in a power system, characterized in that, The invention comprises the following raw materials in parts by weight: 100 parts of room temperature vulcanized silicone rubber, 5 to 15 parts of a cross-linking agent, 0.2 to 0.8 parts of a catalyst, 20 to 40 parts of a reinforcing agent, 25 to 40 parts of a flame retardant, 10 to 30 parts of silicone oil and 100 to 200 parts of a diluent.

2. The one-component silicone rubber-based anti-icing coating for transmission lines in a power system according to claim 1, characterized in that The room temperature vulcanized silicone rubber is composed of terminal hydroxyl polydimethylsiloxane A and terminal hydroxyl polydimethylsiloxane B; the mass fraction of the terminal hydroxyl polydimethylsiloxane A is 50%, and the viscosity is 10000-30000 mPa.s; the mass fraction of the terminal hydroxyl polydimethylsiloxane B is 50%, and the viscosity is 500-1000 mPa.s; Modification method of terminal hydroxyl polydimethylsiloxane B: xylene, epoxy resin E51, KH550 silane coupling agent, and terminal hydroxyl polydimethylsiloxane B are mixed in a mass ratio of 30:1:1:25-50 at 85°C for 5-7 h to obtain terminal hydroxyl polydimethylsiloxane B.

3. The one-component silicone rubber-based anti-icing coating for the transmission line of the power system according to claim 1, characterized in that, The catalyst is one or more of dibutyltin dilaurate, dioctyltin dilaurate, dibutyldimethoxytin, dibutyldiacetyltin and stannous octoate.

4. The one-component silicone rubber-based anti-icing coating for the power transmission line of the power system according to claim 1, characterized in that, The reinforcing agent is composed of fumed silica and precipitated silica in a mass ratio of 1:

2.

5. The one-component silicone rubber-based anti-icing coating for transmission lines of a power system according to claim 4, characterized in that, The particle size of fumed silica is 50~60 nm; the particle size of precipitated silica is 1~3 μm, and the porosity is greater than 80%.

6. The one-component silicone rubber-based anti-icing coating for the power transmission line of the power system according to claim 1, wherein, The flame retardant is one or more of aluminum oxide, tetrabromophthalic anhydride, tetrabromoether, decabromodiphenyl ether and decabromodiphenyl ethane; the aluminum oxide treatment method is: the mass ratio of aluminum oxide to terminal hydroxy dimethyl silicone oil is 10:0.5-2, through mixed grinding treatment, baking treatment in a high temperature oven at 100-120°C for 3-5 hours, and then cooling at room temperature.

7. The one-component silicone rubber-based anti-icing coating for the transmission line of the power system according to claim 1, wherein The diluent is one or more of petroleum ether, toluene, xylene, n-heptane, n-hexane, ethyl acetate, butyl acetate, butanone, acetone, methyl ethyl butanone, trichloroethylene and tetrachloroethylene.

8. The one-component silicone rubber-based anti-icing coating for a transmission line of a power system according to claim 1, wherein, The silicone oil is composed of dimethyl silicone oil and methyl fluorosilicone oil in a mass ratio of 1:1; the viscosity of the dimethyl silicone oil is 500-3000 mPa.s; the viscosity of the methyl fluorosilicone oil is 500-1000 mPa.s.

9. A method for preparing a one-component silicone rubber-based anti-icing coating for power system transmission lines, comprising the following steps: (1) The room temperature vulcanized silicone rubber, reinforcing agent, and flame retardant are preliminarily mixed in a mixing machine for 4 to 6 hours to obtain a preliminary mixed rubber; (2) Then the preliminary mixed rubber is passed through a horizontal grinder and fully ground for 1 to 2 hours to obtain a uniform base rubber; (3) kneading and mixing the base rubber at 100-150 °C in vacuum for 2-3 h to obtain hot glue; (4) After the hot glue is cooled, add silicone oil, stir at high speed until evenly mixed, and then knead and mix again at 100-150 °C in vacuum for 1-2 h; (5) After cooling (4), add the diluent, stir at high speed to make it uniform, then add the crosslinking agent and catalyst, mix and stir thoroughly for 3 to 5 hours, and then seal off from air and package to obtain a single-component silicone rubber-based anti-icing coating.

10. Application of the one-component silicone rubber-based anti-icing coating according to any one of claims 1-8 in the coating of a power insulator.

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