A high-temperature-resistant flame-retardant fluororubber composite material for power distribution cabinets and a preparation method thereof

Abstract

The application discloses a kind of high-temperature-resistant flame-retardant fluororubber composite material for switchgear and a preparation method thereof, and relates to the technical field of fluororubber.The application uses gamma ray co-irradiation method to graft polyvinyl fluoride with diethyl allyl phosphate, and reacts with high methyl vinyl silicone rubber under the action of triallyl phosphate to form a dense three-dimensional hybrid network, increase the phonon scattering resistance to reduce the heat conduction efficiency, and the phosphorus component and the silicon rubber combustion product synergistically form a gas-solid dual flame-retardant barrier.The application grafts talc powder with vinyltriethoxysilane and modifies it by radiation and polymerization with diethyl vinylphosphonate to obtain a lamellar filler, delays heat transfer, and induces the directional formation of carbon layer to form a "lamellar-glass-carbon" composite barrier layer.The surface modification increases the specific surface area, improves the efficiency of free radical capture, and the hybrid crosslinking point formed by graft copolymerization and the matrix network form a double phonon scattering barrier.The high-temperature-resistant flame-retardant fluororubber composite material for switchgear prepared by the application has the effects of high-temperature resistance and flame retardance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fluororubber, in particular to a high-temperature-resistant and flame-retardant fluororubber composite material for power distribution cabinets and a preparation method thereof. BACKGROUND

[0002] In the field of power distribution cabinets, alternating current load, contact resistance temperature rise and potential arc discharge risk pose strict requirements on the high-temperature stability, flame-retardant safety and long-term reliability of internal insulation sealing materials. Although traditional fluororubber or silicone rubber-based materials have basic insulation performance, they have two major technical bottlenecks: first, the regular arrangement of molecular chains at high temperatures leads to high thermal conductivity, and the flame-retardant system mainly relies on single phosphorus-based gas-phase flame retardation or silicon-based solid-phase coverage, lacks phosphorus-silicon synergistic effect, and is prone to form open fire spread and heat transfer; second, the unmodified sheet filler has poor interfacial compatibility with the matrix, it is difficult to build a directional heat-conducting barrier path, and the traditional grafting process cannot precisely control the crosslinking density, resulting in problems such as carbon layer rupture and insulation failure of the material when arc ablation occurs.

[0003] In the prior art, problems such as uneven dispersion of single flame retardant, disordered orientation of fillers and interfacial defects occur, which leads to a significant increase in thermal conductivity of the material when it is used for a long time at a temperature above 150 DEG C, and the flame-retardant efficiency rapidly decreases with the use time, which cannot meet the long-term needs of temperature rise control and safety protection of power distribution cabinets. Therefore, it is urgent to develop a fluororubber-based composite material preparation technology which has "gas-phase-solid-phase" dual flame-retardant synergism, "network-filler" dual thermal resistance barrier and precise interface regulation, so as to solve the key technical problems of existing materials in high-temperature insulation, long-term flame retardation and thermal conductivity inhibition. SUMMARY

[0004] The application aims to provide a high-temperature-resistant and flame-retardant fluororubber composite material for power distribution cabinets and a preparation method thereof, so as to solve the problems in the prior art.

[0005] In order to solve the above technical problems, the application provides the following technical scheme: a high-temperature-resistant and flame-retardant fluororubber composite material for power distribution cabinets, and a preparation method thereof.

[0006] (1) mixing polyvinyl fluoride powder, organic solvent, phosphoric acid triallyl ester and polymerization inhibitor according to the mass ratio of 1-2:2-4:0.2-0.6:0.1-0.2, then performing 30 kHz ultrasonic dispersion for 30 min, performing nitrogen deoxidization at a rate of 5 L / min for 30 min, and then sealing and placing in a constant temperature and humidity box at room temperature 60The grafting polyvinyl fluoride is obtained by irradiating the product under a Co γ ray irradiation source at a dose rate of 5 kGy / h for 4-6 h, filtering the product, and extracting the product with deionized water in a Soxhlet extractor for 72 h, and then drying the product at 60°C under a vacuum of 0.1 kPa until the weight is constant; the grafting polyvinyl fluoride, methyl vinyl silicone rubber, vulcanizing agent 1, and reinforcing filler are added into an open mill in a mass ratio of 1-2:4-8:0.02-0.04:1-2, and the roll temperature is 150-170°C; the mixture is uniformly mixed for 15-25 min, and then vulcanized at 80-200°C for 20-30 min to obtain the fluorine rubber matrix.

[0007] (2) The talc powder, vinyl triethoxysilane, and ethanol are mixed in a mass ratio of 1-2:0.1-0.2:3-5, and then refluxed and stirred at 300 rpm at 60-80°C for 2-3 h; the product is filtered and washed with ethanol for 2-4 times, and then dried at 60°C under a vacuum of 0.1 kPa until the weight is constant to obtain the silanized talc powder; the silanized talc powder, diethyl vinylphosphonate, and ethanol are mixed in a mass ratio of 1-2:0.5-0.15:2-4, and then placed in a 60 The self-made modified filler is obtained by irradiating the product under a Co γ ray irradiation source at a dose rate of 5 kGy / h for 2-4 h, and then washing the product with ethanol for 3 times, and then drying the product at 60°C under a vacuum of 0.1 kPa until the weight is constant.

[0008] (3) The fluorine rubber matrix, self-made modified filler, vulcanizing agent 2, and auxiliary crosslinking agent are mixed in a mass ratio of 1-2:0.2-0.6:0.01-0.05:0.01-0.02, and then added into a banbury mixer, and then mixed at 150-170°C for 10-20 min, and then vulcanized at 190-200°C for 10-15 min to obtain the self-made fluorine rubber composite material.

[0009] Further, the polyvinyl fluoride powder in step (1) has a particle size of 100 μm.

[0010] Further, the organic solvent in step (1) is methanol.

[0011] Further, the polymerization inhibitor in step (1) is ferrous ammonium sulfate hexahydrate.

[0012] Further, the methyl vinyl silicone rubber in step (1) has a vinyl content of 10-30 mol% and a molecular weight of 450-700 thousand.

[0013] Further, the vulcanizing agent 1 in step (1) is 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane.

[0014] Further, the reinforcing filler in step (1) is white carbon black.

[0015] Further, the talc powder in step (2) has a particle size of 10 μm.

[0016] Further, the vulcanizing agent 2 in step (3) is: diisopropyl peroxide.

[0017] Further, the auxiliary crosslinking agent in step (3) is: triallyl isocyanurate.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The present application realizes the effects of high temperature resistance and flame retardance by using self-made fluorine rubber and adding self-made modified lamellar filler.

[0020] Firstly, the present application grafts polyvinyl fluoride with diethyl allyl phosphate by using the method of gamma ray radiation, and then reacts with high methyl vinyl silicone rubber under the action of triallyl phosphate, forming a dense Si, P, C three-dimensional hybrid network, the crosslinking points in the network destroy the regular arrangement of molecular chains, increase the phonon scattering resistance, reduce the heat conduction efficiency, and significantly improve the high temperature resistance of the material; the phosphorus component decomposes to generate phosphorus-containing free radicals when burning, which captures the key free radicals in combustion, inhibits the chain reaction, and the SiO2 micro-particles generated by high methyl vinyl silicone rubber at high temperature can condense the combustible gas in the gas phase, dilute the oxygen concentration, and assist the effect of gas phase combustion inhibition; at the same time, the products of phosphorus decomposition also catalyze the formation of an intumescent carbon layer, which effectively insulates oxygen and heat transfer, and the SiO2 glass generated by the silicone rubber during combustion covers the surface of the material, which together with the carbon layer forms a solid-phase flame retardant barrier, and the gas-solid double coupling greatly improves the flame retardance of the material. The radiation grafting method precisely controls the side grafting rate by adjusting the gamma ray dose, realizes uniform grafting, and avoids local performance defects.

[0021] Secondly, the present application grafts talc powder with vinyl triethoxysilane by radiation and polymerization modification with diethyl vinyl phosphonate to obtain self-made modified lamellar filler. The filler is added to the above-mentioned self-made fluorine rubber, the lamellar nano structure delays the heat transfer to the inside of the matrix, cooperates with the original three-dimensional hybrid network in the matrix to hinder the phonon scattering, and synergistically reduces the thermal conductivity, and also induces the directional growth of carbon layer during the combustion stage, and interweaves to form a "lamellar-glass-carbon" three-dimensional composite barrier layer, the flame retardance is significantly better than that of single carbon layer; after the talc powder is modified by polymerization grafting, a silane-phosphonate composite active layer is formed on the surface, which greatly improves the specific surface area, increases the number of free radicals released per unit mass of filler during combustion, improves the free radical capture efficiency, and further improves the gas phase combustion inhibition effect; the grafted copolymerization of diethyl vinyl phosphonate and vinyl triethoxysilane can form P-O-C and Si-O-C hybrid crosslinking points, significantly improve the crosslinking density, destroy the regular arrangement of molecular chains, increase the phonon scattering path, and reduce the heat conduction efficiency, and form a "network-filler" double phonon scattering barrier with the original three-dimensional hybrid network of the self-made fluorine rubber, thereby improving the overall high temperature resistance. DETAILED DESCRIPTION

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

[0023] In order to more clearly illustrate the method provided by the present application, the following embodiments are described in detail. In the following embodiments, the test methods of various indexes of the high-temperature-resistant and flame-retardant fluororubber composite material for power distribution cabinets are as follows:

[0024] High-temperature resistance: The tensile strength before and after aging at 200℃ for 70h is respectively tested according to the method specified in GB / T 3512-2014 “Vulcanized or thermoplastic rubber hot air accelerated aging and heat resistance test”, and the tensile strength retention rate is calculated.

[0025] Flame resistance: The oxygen index method is used. Under the specified test conditions, the mixed gas of oxygen and nitrogen is introduced, the sample is ignited, the minimum oxygen concentration required to just maintain the sample combustion is measured, and the oxygen index is expressed. The higher the oxygen index, the better the flame resistance of the material. The oxygen index of ordinary fluororubber is between 25% and 27%, and when the oxygen index is >30%, it indicates that the material has high flame resistance.

[0026] Example 1

[0027] (1) Polyvinyl fluoride powder with a particle size of 100μm, methanol, triallyl phosphate and ferrous ammonium sulfate hexahydrate were mixed in a mass ratio of 1:2:0.2:0.1, then ultrasonic dispersion was carried out at 30kHz for 30min, nitrogen was introduced at a rate of 5L / min to remove oxygen for 30min, and then it was sealed and placed at room temperature. 60 Coγ ray irradiation source, 4h at a dose rate of 5kGy / h, the product was filtered and placed in a Soxhlet extractor for extraction with deionized water for 72h, then dried at 60℃ under a vacuum degree of 0.1kPa to constant weight to obtain grafted polyvinyl fluoride; the grafted polyvinyl fluoride, methyl vinyl silicone rubber, 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and white carbon black were added to an open mill in a mass ratio of 1:4:0.02:1, and mixed at a roll temperature of 150℃ for 15min until uniform, then vulcanized at 180℃ for 20min to obtain a fluororubber matrix;

[0028] (2) The silane-treated talc powder was obtained by mixing talc powder with a particle size of 10 μm, vinyl triethoxysilane and ethanol in a mass ratio of 1:0.1:3, stirring at 300 rpm under reflux at 60 °C for 2 h, filtering and washing twice with ethanol, and drying to constant weight at 60 °C under a vacuum degree of 0.1 kPa. The silane-treated talc powder, diethyl vinylphosphonate and ethanol were mixed in a mass ratio of 1:0.5:2, and placed at room temperature in a 60 The self-made modified filler was obtained by irradiating under a Co γ-ray irradiation source at a dose rate of 5 kGy / h for 2 h, washing the product with ethanol for 3 times, and drying to constant weight at 60 °C under a vacuum degree of 0.1 kPa.

[0029] (3) The self-made fluororubber composite material was prepared by mixing fluororubber matrix, self-made modified filler, diisopropyl peroxide and triallyl isocyanurate in a mass ratio of 1:0.2:0.01:0.01, adding into an internal mixer, mixing at 150 °C for 10 min, and vulcanizing at 190 °C for 10 min.

[0030] Example 2

[0031] (1) The polyvinyl fluoride powder with a particle size of 100 μm, methanol, phosphorous acid triallyl ester and ferrous ammonium sulfate hexahydrate were mixed in a mass ratio of 1.5:3:0.4:0.15, ultrasonic dispersed at 30 kHz for 30 min, deoxygenated by nitrogen at a rate of 5 L / min for 30 min, sealed, and placed at room temperature in a 60 The grafted polyvinyl fluoride was obtained by irradiating under a Co γ-ray irradiation source at a dose rate of 5 kGy / h for 5 h, filtering the product and extracting with deionized water in a Soxhlet extractor for 72 h, and drying to constant weight at 60 °C under a vacuum degree of 0.1 kPa. The grafted polyvinyl fluoride, methyl vinyl silicone rubber, 2,5-dimethyl-2,5-di-tert-butyl peroxide and white carbon black were added into an open mill in a mass ratio of 1.5:6:0.03:1.5, mixed uniformly at a roll temperature of 160 °C for 20 min, and vulcanized at 190 °C for 25 min to prepare the fluororubber matrix.

[0032] (2) The silane-treated talc powder was obtained by mixing talc powder with a particle size of 10 μm, vinyl triethoxysilane and ethanol in a mass ratio of 1.5:0.15:4, stirring at 300 rpm under reflux at 70 °C for 2.5 h, filtering and washing three times with ethanol, and drying to constant weight at 60 °C under a vacuum degree of 0.1 kPa. The silane-treated talc powder, diethyl vinylphosphonate and ethanol were mixed in a mass ratio of 1.5:0.1:3, and placed at room temperature in a 60 The self-made modified filler was obtained by irradiating under a Co γ-ray irradiation source at a dose rate of 5 kGy / h for 3 h, washing the product with ethanol for 3 times, and drying to constant weight at 60 °C under a vacuum degree of 0.1 kPa.

[0033] (3) The fluororubber matrix, self-made modified filler, diisopropyl peroxide and triallyl isocyanurate were mixed in a mass ratio of 1.5:0.4:0.03:0.015, and then added into a mixer. After mixing at 160℃ for 18 min, the self-made fluororubber composite material was prepared by vulcanization at 195℃ for 13 min.

[0034] Example 3

[0035] (1) Polyvinyl fluoride powder with a particle size of 100 μm, methanol, phosphorus acid triallyl ester and ferrous ammonium sulfate hexahydrate were mixed in a mass ratio of 2:4:0.6:0.2, and then ultrasonically dispersed at 30 kHz for 30 min. After nitrogen was passed at a rate of 5 L / min to remove oxygen for 30 min, the mixture was sealed and placed at room temperature. 60 The grafted polyvinyl fluoride was obtained by irradiating under a Co γ-ray radiation source at a dose rate of 5 kGy / h for 6 h, filtering the product and extracting it with deionized water in a Soxhlet extractor for 72 h, and then drying at 60℃ under a vacuum of 0.1 kPa to a constant weight. The grafted polyvinyl fluoride, methyl vinyl silicone rubber, 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and white carbon black were added into an open mill in a mass ratio of 2:8:0.04:2, and mixed uniformly at a roll temperature of 170℃ for 25 min. The fluororubber matrix was prepared by vulcanization at 200℃ for 30 min.

[0036] (2) Talc powder with a particle size of 10 μm, vinyl triethoxysilane and ethanol were mixed in a mass ratio of 2:0.2:5, and then refluxed at 80℃ with stirring at 300 rpm for 3 h. After filtration and washing with ethanol for 4 times, the silanized talc powder was obtained by drying at 60℃ under a vacuum of 0.1 kPa to a constant weight. The silanized talc powder, diethyl vinylphosphonate and ethanol were mixed in a mass ratio of 2:0.15:4, and then placed at room temperature. 60 The self-made modified filler was obtained by washing the product with ethanol for 3 times after irradiation under a Co γ-ray radiation source at a dose rate of 5 kGy / h for 4 h, and then drying at 60℃ under a vacuum of 0.1 kPa to a constant weight.

[0037] (3) The fluororubber matrix, self-made modified filler, diisopropyl peroxide and triallyl isocyanurate were mixed in a mass ratio of 2:0.6:0.05:0.02, and then added into a mixer. After mixing at 170℃ for 20 min, the self-made fluororubber composite material was prepared by vulcanization at 200℃ for 15 min.

[0038] Comparative Example 1

[0039] Comparative Example 1 differs from Example 2 in that step (1) is changed to: polyvinyl fluoride powder with a particle size of 100 μm, methylvinyl silicone rubber, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane and white carbon black are added to an open mill in a mass ratio of 1.5:6:0.03:1.5, and after mixing for 20 min to uniformity, the mixture is vulcanized at 190°C for 25 min to obtain a fluororubber matrix, and the remaining steps are the same as in Example 2.

[0040] Comparative Example 2

[0041] Comparative Example 2 differs from Example 2 in that step (1) is changed to: polyvinyl fluoride powder with a particle size of 100 μm, methanol, triallyl phosphate and ferrous ammonium sulfate hexahydrate are mixed in a mass ratio of 1.5:3:0.4:0.15, and after ultrasonic dispersion at 30 kHz for 30 min, the mixture is sealed after deoxygenation by nitrogen blowing at a rate of 5 L / min for 30 min, and is placed in a 60 Under a Co γ-ray irradiation source, the product is irradiated at a dose rate of 5 kGy / h for 5 h, filtered and placed in a Soxhlet extractor for extraction with deionized water for 72 h, and then dried at 60°C under a vacuum of 0.1 kPa to constant weight to obtain grafted polyvinyl fluoride; the grafted polyvinyl fluoride, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane and white carbon black are added to an open mill in a mass ratio of 1.5:0.03:1.5, and after mixing for 20 min to uniformity, the mixture is vulcanized at 190°C for 25 min to obtain a fluororubber matrix, and the remaining steps are the same as in Example 2.

[0042] Comparative Example 3

[0043] Comparative Example 3 differs from Example 2 in that step (2) is changed to: talc powder with a particle size of 10 μm, diethyl vinylphosphonate and ethanol are mixed in a mass ratio of 1.5:0.1:3, and the mixture is placed in a 60 After irradiation under a Co γ-ray irradiation source at a dose rate of 5 kGy / h for 3 h, the product is washed with ethanol 3 times, and then dried at 60°C under a vacuum of 0.1 kPa to constant weight to obtain a self-made modified filler, and the remaining steps are the same as in Example 2.

[0044] Comparative Example 4

[0045] Comparative Example 4 differs from Example 2 in that step (2) is changed to: talc powder with a particle size of 10 μm, vinyltriethoxysilane and ethanol are mixed in a mass ratio of 1.5:0.15:4, and after reflux reaction at 70°C with stirring at 300 rpm for 2.5 h, the mixture is filtered and washed with ethanol 3 times, and then dried at 60°C under a vacuum of 0.1 kPa to constant weight to obtain a self-made modified filler, and the remaining steps are the same as in Example 2.

[0046] Comparative Example 5

[0047] Comparative Example 5 differs from Example 2 in that step (2) is removed, and step (3) is changed to: mixing the fluoroelastomer base, diisopropyl peroxide and triallyl isocyanurate in a mass ratio of 1.5:0.03:0.015, then adding into the internal mixer, mixing at 160°C for 18 min, and then vulcanizing at 195°C for 13 min to obtain a self-made fluoroelastomer composite, and the remaining steps are the same as those of Example 2.

[0048] Effect Example

[0049] The performance analysis results of the high-temperature-resistant and flame-retardant fluoroelastomer composite for switchgear in Examples 1 to 3 and Comparative Examples 1 to 5 of the present application are shown in Table 1 below.

[0050] Table 1

[0051]

[0052]

[0053] From the experimental data comparison of tensile strength retention rate of the examples and the comparative examples, it can be found that, after allyl diethyl phosphate is grafted on polyfluoroethylene by gamma rays using the method of co-radiation, and then reacts with methyl vinyl silicone rubber under the action of triallyl phosphate, a dense Si, P, C three-dimensional hybrid network is formed, the crosslinking points in the network destroy the regular arrangement of molecular chains, increase the phonon scattering resistance, reduce the heat conduction efficiency, and significantly improve the high temperature resistance of the material. Meanwhile, the ethylene triethoxysilane grafted talc powder is modified by radiation and polymerization with vinyl phosphonate diethyl, and a self-made modified lamellar filler is obtained. The filler is added to the self-made fluororubber, the lamellar nanostructure delays the heat transfer to the inside of the matrix, and cooperates with the original three-dimensional hybrid network in the matrix to hinder the phonon scattering, and synergistically reduces the thermal conductivity. The grafted copolymerization of vinyl phosphonate diethyl and vinyl triethoxysilane can form P-O-C, Si-O-C hybrid crosslinking points, significantly increase the crosslinking density, destroy the regular arrangement of molecular chains, increase the phonon scattering path, reduce the heat conduction efficiency, and form a "network-filler" double phonon scattering barrier with the original three-dimensional hybrid network of the self-made fluororubber, thereby improving the overall high temperature resistance. From the experimental data comparison of the oxygen index of the examples and the comparative examples, it can be found that, when the phosphorus-based component burns, phosphorus-containing free radicals are generated by decomposition, which can capture key free radicals in combustion and inhibit chain reactions. Meanwhile, SiO2 micro-particles generated by high methyl vinyl silicone rubber at high temperature can condense combustible gases in the gas phase, dilute the oxygen concentration, and assist the effect of gas phase combustion inhibition. At the same time, the phosphorus-based component decomposes to generate phosphorus-containing oxygen-containing acid, which catalyzes the dehydration of carbon and hydrogen components in polyfluoroethylene and silicone rubber to form carbon, and forms an intumescent carbon layer that can effectively insulate oxygen and heat transfer. When the silicone rubber burns, SiO2 glass is generated to cover the surface of the material, and together with the carbon layer, it forms a solid-phase flame retardant barrier, which greatly improves the flame retardant performance of the material. The lamellar nanostructure can also induce the directional growth of the carbon layer during the combustion stage, and interweave to form a "lamellar-glass-carbon" three-dimensional composite barrier layer, which has significantly better flame retardant performance than a single carbon layer. After the talc powder is modified by polymerization grafting, a silane-phosphonate composite active layer is formed on the surface, which greatly increases the specific surface area, increases the number of free radicals released per unit mass of filler during combustion, improves the free radical capture efficiency, and further improves the gas phase combustion inhibition effect.

[0054] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the foregoing embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the elements of the claims. Any mark in the claims should not be considered as limiting the involved claims.

Claims

1. A high temperature resistant, flame retardant fluoroelastomer composite for switchgear, characterized in that, The method comprises the following steps: (1) mixing polyvinyl fluoride powder, organic solvent, phosphoric acid triallyl ester and polymerization inhibitor according to the mass ratio of 1-2:0.2-0.6:0.01-0.05:0.01-0.02, and then adding the mixture into a mixer to mix at 150-170 ℃ for 10-20 min, and then vulcanizing at 190-200 ℃ for 10-15 min to obtain self-made fluorine rubber composite material. 1-2:2-4:0.2-0.6:0.1-0.2, after mixing, 30 kHz ultrasonic dispersion for 30 min, sealed after deoxygenation with nitrogen at a rate of 5 L / min for 30 min, and placed at room temperature 60 Co γ-ray irradiation source, 4-6 h at a dose rate of 5 kGy / h, the product was filtered and placed in a Soxhlet extractor with deionized water extraction for 72 h, dried at 60°C, 0.1 kPa vacuum to constant weight to obtain grafted polyvinyl fluoride; graft polyvinyl fluoride, methyl vinyl silicone rubber, vulcanizing agent 1 and reinforcing filler were added to an open mill at a mass ratio of 1-2:4-8:0.02-0.04:1-2, the roll temperature was 150-170°C, and mixing was carried out for 15-25 min until uniform, then vulcanized at 180-200°C for 20-30 min to obtain a fluorine rubber matrix; (2) mixing talc, vinyltriethoxysilane and ethanol according to the mass ratio of 1-2:0.1-0.2:3-5, refluxing and stirring at 60-80℃ and 300rpm for 2-3h, filtering and washing with ethanol for 2-4 times, drying at 60℃ and 0.1kPa to constant weight to obtain silanized talc; mixing the silanized talc, diethyl vinylphosphonate and ethanol according to the mass ratio of 1-2:0.5-0.15:2-4, and placing at room temperature for 2-4h to obtain the modified filler. 60 irradiating under a Co γ ray source at a dose rate of 5kGy / h for 2-4h, washing the product with ethanol for 3 times, drying at 60℃ and 0.1kPa to constant weight to obtain the self-made modified filler; The polyvinyl fluoride powder in step (1) has a particle size of 50-150 μm. The organic solvent in step (1) is methanol.

2. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, The polymerization inhibitor in step (1) is ferrous ammonium sulfate hexahydrate.

3. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, The methyl vinyl silicone rubber in step (1) has a vinyl content of 10-30 mol% and a molecular weight of 450-700 thousand.

4. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, The vulcanizing agent 1 in step (1) is 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane.

5. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, The reinforcing filler in step (1) is white carbon black.

6. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, The talc powder in step (2) has a particle size of 5-10 μm.

7. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, The vulcanizing agent 2 in step (3) is diisopropyl peroxide.

8. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, The auxiliary crosslinking agent in step (3) is triallyl isocyanurate.

9. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, ​ 10. The high temperature resistant and flame retardant fluororubber composite material for switchgear according to claim 1, characterized in that, ​

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