High-temperature-resistant flame-retardant fluororubber composite material for power distribution cabinet and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant flame-retardant fluororubber composite material for a power distribution cabinet and a preparation method thereof, and relates to the technical field of fluororubber. According to the preparation method, polyvinyl fluoride is grafted with allyl diethyl phosphate by adopting a gamma-ray co-radiation method and reacts with high methyl vinyl silicone rubber under the action of triallyl phosphate to form a compact three-dimensional hybrid network, so that the phonon scattering resistance is increased to reduce the heat conduction efficiency; the phosphorus-based component and a silicone rubber combustion product cooperate to form a gas phase-solid phase dual flame-retardant barrier; vinyltriethoxysilane grafted talcum powder is subjected to polymerization modification with diethyl vinylphosphonate through radiation to prepare a lamellar filler, heat transfer is delayed, and a carbon layer is induced to directionally form a'lamellar-glass-carbon 'composite barrier layer; the specific surface area is increased through surface modification, the free radical capture efficiency is improved, and hybrid cross-linking points formed through graft copolymerization and a matrix network form a dual phonon scattering barrier. The prepared high-temperature-resistant flame-retardant fluororubber composite material for the power distribution cabinet has high-temperature-resistant and flame-retardant effects.

Description

Technical Field

[0001] The present invention relates to the technical field of fluororubber, and specifically to a high-temperature resistant and flame-retardant fluororubber composite material for power distribution cabinets and a preparation method thereof. Background Art

[0002] In the field of power distribution cabinets, alternating current loads, contact resistance temperature rise, and potential arc discharge risks pose severe requirements on the high-temperature stability, flame-retardant safety, and long-term reliability of internal insulation and sealing materials. Although traditional fluororubber or silicone rubber-based materials have basic insulation properties, there are two major technical bottlenecks: First, the regular arrangement of molecular chains at high temperatures leads to a relatively high thermal conductivity, and the flame-retardant system mostly relies on a single phosphorus-based gas-phase flame inhibition or silicon-based solid-phase coverage, lacking the phosphorus-silicon synergistic effect, which is prone to form open fire spread and heat transfer; Second, the interfacial compatibility between unmodified lamellar fillers and the matrix is poor, making it difficult to construct a directional heat conduction barrier path, and the traditional grafting process cannot accurately control the crosslinking density, resulting in problems such as carbon layer rupture and insulation failure when the material is arc-ablated.

[0003] In the prior art, problems such as uneven dispersion of single flame retardants, disordered filler orientation, and interfacial defects lead to a significant increase in thermal conductivity when the material is in long-term service above 150°C, and the flame-retardant efficiency rapidly decreases with the use time, unable to meet the long-term requirements of power distribution cabinets for temperature rise control and safety protection. Therefore, there is an urgent need to develop a preparation technology for fluororubber-based composite materials with "gas-phase-solid-phase" dual flame-retardant synergy, "network-filler" dual thermal resistance barriers, and precise interface regulation to solve the key technical problems of existing materials in high-temperature insulation, long-lasting flame retardancy, and thermal conductivity inhibition. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature resistant and flame-retardant fluororubber composite material for power distribution cabinets and a preparation method thereof to solve the problems existing in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A high-temperature resistant and flame-retardant fluororubber composite material for power distribution cabinets, and the preparation method of the high-temperature resistant and flame-retardant fluororubber composite material for power distribution cabinets includes the following steps:

[0006] (1) Mix polyvinyl fluoride powder, organic solvent, triallyl phosphate, and inhibitor in a mass ratio of 1-2:2-4:0.2-0.6:0.1-0.2, then disperse them by ultrasonic wave at 30 kHz for 30 min, deoxygenate them by passing nitrogen at a rate of 5 L / min for 30 min and then seal, and place them at room temperature in 60Under a Coγ-ray irradiation source, irradiate at a dose rate of 5 kGy / h for 4 - 6 h, filter the product and place it in a Soxhlet extractor to extract with deionized water for 72 h, then dry it to constant weight at 60 °C under a vacuum of 0.1 kPa to obtain grafted polyvinyl fluoride; add the grafted polyvinyl fluoride, methyl vinyl silicone rubber, vulcanizing agent 1 and reinforcing filler to an open mill in a mass ratio of 1 - 2:4 - 8:0.02 - 0.04:1 - 2, with a roll temperature of 150 - 170 °C, knead for 15 - 25 min until uniform, and then vulcanize at 80 - 200 °C for 20 - 30 min to obtain a fluororubber matrix;

[0007] (2) Mix talcum powder, vinyltriethoxysilane and ethanol in a mass ratio of 1 - 2:0.1 - 0.2:3 - 5, stir and reflux at 60 - 80 °C at 300 rpm for 2 - 3 h, then filter and wash with ethanol 2 - 4 times, and dry to constant weight at 60 °C under a vacuum of 0.1 kPa to obtain silanized talcum powder; mix the silanized talcum powder, diethyl vinylphosphonate and ethanol in a mass ratio of 1 - 2:0.5 - 0.15:2 - 4, and place it at room temperature 60 Under a Coγ-ray irradiation source, irradiate at a dose rate of 5 kGy / h for 2 - 4 h, wash the product with ethanol 3 times, and dry to constant weight at 60 °C under a vacuum of 0.1 kPa to obtain a self-made modified filler;

[0008] (3) Mix the fluororubber matrix, self-made modified filler, vulcanizing agent 2 and co-crosslinking agent in a mass ratio of 1 - 2:0.2 - 0.6:0.01 - 0.05:0.01 - 0.02, add them to an internal mixer, knead at 150 - 170 °C for 10 - 20 min, and then vulcanize at 190 - 200 °C for 10 - 15 min to obtain a self-made fluororubber composite material.

[0009] Further, in step (1): the polyvinyl fluoride powder: the particle size is 100 μm.

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

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

[0012] Further, in step (1): the methyl vinyl silicone rubber: the vinyl content is 10 - 30 mol%, and the molecular weight is 450,000 - 700,000.

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

[0014] Further, the reinforcing filler in step (1) is: silica.

[0015] Further, in step (2): the talcum powder: the particle size is 10 μm.

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

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

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] The present invention realizes the effects of high temperature resistance and flame retardancy by self-preparing fluororubber and adding self-prepared modified lamellar fillers.

[0020] First of all, in the present invention, polyvinyl fluoride is grafted with diethyl allyl phosphate by co-radiation using γ-rays, and then reacts with high-methyl vinyl silicone rubber under the action of triallyl phosphate to form 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-based components decompose during combustion to generate phosphorus-containing free radicals, capture the key free radicals in combustion, inhibit the chain reaction, and at the same time, the SiO2 microparticles generated by high-methyl vinyl silicone rubber at high temperature can condense the combustible gases in the gas phase, dilute the oxygen concentration, and assist the gas-phase combustion inhibition effect; at the same time, the products decomposed by the phosphorus-based components also catalyze the formation of an intumescent carbon layer, effectively isolating the transfer of oxygen and heat. The SiO2 vitreous body generated when the silicone rubber burns covers the surface of the material and forms a solid-phase flame retardant barrier together with the carbon layer. The gas-phase-solid-phase double coupling greatly improves the flame retardant performance of the material. The radiation grafting method is used to accurately control the side-chain grafting rate by adjusting the γ-ray dose to achieve uniform grafting and avoid local performance defects.

[0021] Secondly, the present invention uses vinyltriethoxysilane to graft talc powder, which is polymerized and modified with diethyl vinylphosphonate by radiation to obtain a self-prepared modified lamellar filler. The filler is added to the above self-prepared fluororubber. The lamellar nanostructure delays the heat transfer to the interior of the matrix, cooperates with the phonon scattering hindrance of the original three-dimensional hybrid network in the matrix, synergistically reduces the thermal conductivity, and can also induce the directional growth of the carbon layer during the combustion stage, interweaving to form a "lamella-glass-carbon" three-dimensional composite barrier layer, and the flame retardant performance is significantly better than that of a single carbon layer; after the talc powder is polymerized and grafted and modified, a silane-phosphonate composite active layer is formed on the surface, greatly increasing the specific surface area, so that the number of free radicals released by the filler per unit mass during combustion increases, improving the free radical capture efficiency, and then improving the gas-phase combustion inhibition effect; the graft copolymerized diethyl vinylphosphonate and vinyltriethoxysilane can form P-O-C and Si-O-C hybrid crosslinking points, significantly increasing the crosslinking density, destroying the regular arrangement of molecular chains, increasing the phonon scattering path, reducing the heat conduction efficiency, and forming a "network-filler" double phonon scattering barrier with the original three-dimensional hybrid network of the self-prepared fluororubber, improving the overall high temperature resistance. Detailed implementation manners

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

[0023] In order to more clearly illustrate the method provided by the present invention, the following embodiments are used for detailed description. The test methods for each index of the high-temperature resistant and flame-retardant fluororubber composite material for the distribution cabinet manufactured in the following embodiments are as follows:

[0024] High-temperature resistance performance: The tensile strength before and after aging at 200 °C for 70 h is respectively tested by the method specified in GB / T 3512-2014 "Vulcanized Rubber or Thermoplastic Rubber - Heat Aging and Heat Resistance Tests in Air", and the tensile strength retention rate is calculated.

[0025] Flame retardant performance: The oxygen index method is adopted. Under the specified test conditions, a mixed gas of oxygen and nitrogen is introduced, the specimen is ignited, and the lowest oxygen concentration required to just maintain the combustion of the specimen is measured, which is expressed by the oxygen index. The higher the oxygen index, the better the flame retardant performance of the material. The oxygen index of ordinary fluororubber is between 25% and 27%. When the oxygen index > 30%, it indicates high flame retardant performance.

[0026] Example 1

[0027] (1) After mixing polyvinyl fluoride powder with a particle size of 100 μm, methanol, triallyl phosphate and ammonium ferrous sulfate hexahydrate in a mass ratio of 1:2:0.2:0.1, ultrasonic dispersion is carried out at 30 kHz for 30 min, nitrogen is passed through at a rate of 5 L / min for deoxygenation for 30 min and then sealed, and it is placed at room temperature under 60 a Coγ-ray irradiation source, irradiated at a dose rate of 5 kGy / h for 4 h, the product is filtered by suction and placed in a Soxhlet extractor for extraction with deionized water for 72 h, and then dried to constant weight at 60 °C and a vacuum degree of 0.1 kPa to obtain grafted polyvinyl fluoride; The grafted polyvinyl fluoride, methyl vinyl 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 1:4:0.02:1, the roll temperature is 150 °C, and after mixing for 15 min until uniform, vulcanization is carried out at 180 °C for 20 min to obtain a fluororubber matrix;

[0028] (2) Mix talcum powder with a particle size of 10 μm, vinyltriethoxysilane, and ethanol in a mass ratio of 1:0.1:3. After stirring and refluxing at 60 °C for 2 h at 300 rpm, filter and wash with ethanol twice, and dry to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain silanized talcum powder; Mix silanized talcum powder, diethyl vinylphosphonate, and ethanol in a mass ratio of 1:0.5:2, and place it at 60 under a Coγ-ray irradiation source. After irradiating at a dose rate of 5 kGy / h for 2 h, wash the product with ethanol three times, and dry to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain the self-made modified filler;

[0029] (3) Mix the fluororubber matrix, the self-made modified filler, diisopropylbenzene peroxide, and triallyl isocyanurate in a mass ratio of 1:0.2:0.01:0.01, add them to a mixer, knead at 150 °C for 10 min, and vulcanize at 190 °C for 10 min to obtain the self-made fluororubber composite material.

[0030] Example 2

[0031] (1) Mix polyvinyl fluoride powder with a particle size of 100 μm, methanol, triallyl phosphate, and ammonium ferrous sulfate hexahydrate in a mass ratio of 1.5:3:0.4:0.15, disperse ultrasonically at 30 kHz for 30 min, deoxygenate by passing nitrogen at a rate of 5 L / min for 30 min and then seal, and place it at 60 under a Coγ-ray irradiation source. After irradiating at a dose rate of 5 kGy / h for 5 h, filter the product and place it in a Soxhlet extractor to extract with deionized water for 72 h, and dry to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain grafted polyvinyl fluoride; Add grafted polyvinyl fluoride, methyl vinyl silicone rubber, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, and silica to a mill at a mass ratio of 1.5:6:0.03:1.5, with a roll temperature of 160 °C, knead for 20 min until uniform, and vulcanize at 190 °C for 25 min to obtain the fluororubber matrix;

[0032] (2) Mix talcum powder with a particle size of 10 μm, vinyltriethoxysilane, and ethanol in a mass ratio of 1.5:0.15:4. After stirring and refluxing at 70 °C for 2.5 h at 300 rpm, filter and wash with ethanol three times, and dry to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain silanized talcum powder; Mix silanized talcum powder, diethyl vinylphosphonate, and ethanol in a mass ratio of 1.5:0.1:3, and place it at 60 under a Coγ-ray irradiation source. After irradiating at a dose rate of 5 kGy / h for 3 h, wash the product with ethanol three times, and dry to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain the self-made modified filler;

[0033] (3) Mix the fluororubber matrix, self-made modified filler, diisopropylbenzene peroxide, and triallyl isocyanurate in a mass ratio of 1.5:0.4:0.03:0.015, add them to a kneader, knead at 160 °C for 18 min, and then vulcanize at 195 °C for 13 min to obtain the self-made fluororubber composite material.

[0034] Example 3

[0035] (1) Mix polyvinyl fluoride powder with a particle size of 100 μm, methanol, triallyl phosphate, and ammonium ferrous sulfate hexahydrate in a mass ratio of 2:4:0.6:0.2, disperse them by ultrasonic wave at 30 kHz for 30 min, deoxygenate them by passing nitrogen at a rate of 5 L / min for 30 min and then seal, place them under a 60 Coγ-ray irradiation source, irradiate at a dose rate of 5 kGy / h for 6 h, filter the product and place it in a Soxhlet extractor to extract with deionized water for 72 h, and then dry it to constant weight at 60 °C and a vacuum degree of 0.1 kPa to obtain grafted polyvinyl fluoride; Add the grafted polyvinyl fluoride, methyl vinyl silicone rubber, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, and silica white to an open mill in a mass ratio of 2:8:0.04:2, with a roll temperature of 170 °C, knead for 25 min until uniform, and then vulcanize at 200 °C for 30 min to obtain the fluororubber matrix;

[0036] (2) Mix talcum powder with a particle size of 10 μm, vinyltriethoxysilane, and ethanol in a mass ratio of 2:0.2:5, stir and reflux at 80 °C at 300 rpm for 3 h, filter and wash with ethanol 4 times, and dry it to constant weight at 60 °C and a vacuum degree of 0.1 kPa to obtain silanized talcum powder; Mix the silanized talcum powder, diethyl vinylphosphonate, and ethanol in a mass ratio of 2:0.15:4, place them under a 60 Coγ-ray irradiation source, irradiate at a dose rate of 5 kGy / h for 4 h, wash the product with ethanol 3 times, and dry it to constant weight at 60 °C and a vacuum degree of 0.1 kPa to obtain the self-made modified filler;

[0037] (3) Mix the fluororubber matrix, self-made modified filler, diisopropylbenzene peroxide, and triallyl isocyanurate in a mass ratio of 2:0.6:0.05:0.02, add them to a kneader, knead at 170 °C for 20 min, and then vulcanize at 200 °C for 15 min to obtain the self-made fluororubber composite material.

[0038] Comparative Example 1

[0039] The difference between Comparative Example 1 and Example 2 lies in step (1), which is changed to: Add polyvinyl fluoride powder with a particle size of 100 μm, methyl vinyl silicone rubber, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane and silica to an open mill according to a mass ratio of 1.5:6:0.03:1.5. The roll temperature is 160 °C, and after kneading for 20 min until uniform, vulcanize at 190 °C for 25 min to obtain a fluororubber matrix. The remaining steps are the same as those in Example 2.

[0040] Comparative Example 2

[0041] The difference between Comparative Example 2 and Example 2 lies in step (1), which is changed to: Mix polyvinyl fluoride powder with a particle size of 100 μm, methanol, triallyl phosphate and ammonium ferrous sulfate hexahydrate according to a mass ratio of 1.5:3:0.4:0.15, disperse ultrasonically at 30 kHz for 30 min, deoxygenate by purging nitrogen at a rate of 5 L / min for 30 min and then seal, and place it at 60 under a Coγ-ray irradiation source, irradiate at a dose rate of 5 kGy / h for 5 h, filter the product and place it in a Soxhlet extractor to extract with deionized water for 72 h, and then dry it to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain grafted polyvinyl fluoride; Add the grafted polyvinyl fluoride, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane and silica to an open mill according to a mass ratio of 1.5:0.03:1.5. The roll temperature is 160 °C, and after kneading for 20 min until uniform, vulcanize at 190 °C for 25 min to obtain a fluororubber matrix. The remaining steps are the same as those in Example 2.

[0042] Comparative Example 3

[0043] The difference between Comparative Example 3 and Example 2 lies in step (2), which is changed to: Mix talcum powder with a particle size of 10 μm, diethyl vinylphosphonate and ethanol according to a mass ratio of 1.5:0.1:3, and place it at room temperature 60 under a Coγ-ray irradiation source, irradiate at a dose rate of 5 kGy / h for 3 h, wash the product with ethanol 3 times, and dry it to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain a self-made modified filler. The remaining steps are the same as those in Example 2.

[0044] Comparative Example 4

[0045] The difference between Comparative Example 4 and Example 2 lies in step (2), which is changed to: Mix talcum powder with a particle size of 10 μm, vinyltriethoxysilane and ethanol according to a mass ratio of 1.5:0.15:4, stir and reflux at 70 °C at 300 rpm for 2.5 h, filter and wash with ethanol 3 times, and dry it to constant weight at 60 °C and a vacuum of 0.1 kPa to obtain a self-made modified filler. The remaining steps are the same as those in Example 2.

[0046] Comparative Example 5

[0047] The difference between Comparative Example 5 and Example 2 is that step (2) is removed, and step (3) is changed to: mix the fluororubber matrix, diisopropylbenzene peroxide and triallyl isocyanurate in a mass ratio of 1.5:0.03:0.015, add them to a kneader, knead at 160 °C for 18 min, and then vulcanize at 195 °C for 13 min to obtain the self-made fluororubber composite material. The remaining steps are the same as those in Example 2.

[0048] Effect Example

[0049] The following Table 1 shows the performance analysis results of the high-temperature resistant and flame-retardant fluororubber composite materials for power distribution cabinets using Examples 1 to 3 and Comparative Examples 1 to 5 of the present invention.

[0050] Table 1

[0051]

[0052]

[0053] From the comparison of the experimental data of the tensile strength retention rate between the examples and the comparative examples, it can be found that in the present invention, after grafting diethyl allyl phosphate to polyvinyl fluoride by means of co-radiation using γ-rays, reacting with methyl vinyl silicone rubber under the action of triallyl phosphate forms a dense Si, P, C three-dimensional hybrid network. The crosslinking points in the network disrupt the regular arrangement of molecular chains, increase the phonon scattering resistance, reduce the heat conduction efficiency, and significantly improve the high-temperature resistance performance of the material. At the same time, vinyltriethoxysilane-grafted talc powder is polymerized and modified with diethyl vinylphosphonate by radiation to obtain a self-made modified lamellar filler. When the filler is added to the above-mentioned self-made fluororubber, the lamellar nanostructure delays the transfer of heat to the interior of the matrix, and cooperates with the obstruction of phonon scattering by the original three-dimensional hybrid network in the matrix to synergistically reduce the thermal conductivity. The graft copolymerized diethyl vinylphosphonate and vinyltriethoxysilane can form P-O-C and Si-O-C hybrid crosslinking points, significantly increasing the crosslinking density, disrupting the regular arrangement of molecular chains, increasing the phonon scattering path, reducing the heat conduction efficiency, and forming a "network-filler" dual phonon scattering barrier with the original three-dimensional hybrid network of the self-made fluororubber, thus enhancing the overall high-temperature resistance performance; from the comparison of the experimental data of the oxygen index between the examples and the comparative examples, it can be found that the phosphorus-based component decomposes during combustion to generate phosphorus-containing free radicals, which capture the key free radicals in combustion and inhibit the chain reaction. At the same time, the SiO2 microparticles generated by high-methyl vinyl silicone rubber at high temperature can condense the combustible gases in the gas phase and dilute the oxygen concentration to assist the gas-phase combustion inhibition effect; at the same time, the phosphorus-based component decomposes to generate phosphorus-containing and oxygen-containing acids, which catalyze the dehydration of the hydrocarbon components in polyvinyl fluoride and silicone rubber to form carbon, forming an intumescent carbon layer, which can effectively isolate the transfer of oxygen and heat. 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. The gas-phase-solid-phase dual coupling greatly enhances the flame retardant performance of the material; the lamellar nanostructure can also induce the directional growth of the carbon layer during the combustion stage, interweaving to form a "lamellar-glass-carbon" three-dimensional composite barrier layer, and the flame retardant performance is significantly better than that of a single carbon layer; after the talc powder is polymerized and grafted and modified, a silane-phosphonate composite active layer is formed on the surface, greatly increasing the specific surface area, so that the number of free radicals released by the filler per unit mass during combustion increases, improving the free radical capture efficiency, and thus enhancing the gas-phase combustion inhibition effect.

[0054] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet, characterized in that, It includes the following steps: (1) Mix polyvinyl fluoride powder, organic solvent, triallyl phosphate and inhibitor according to the mass ratio After mixing 1-2:2-4:0.2-0.6:0.1-0.2, ultrasonic dispersion is carried out at 30 kHz for 30 min. After deoxygenation by nitrogen purging at a rate of 5 L / min for 30 min, it is sealed and placed at room temperature under 60 a Coγ-ray irradiation source, irradiated at a dose rate of 5 kGy / h for 4-6 h. The product is filtered by suction and placed in a Soxhlet extractor for extraction with deionized water for 72 h, and then dried to constant weight at 60 °C and a vacuum degree of 0.1 kPa to obtain grafted polyvinyl fluoride; The grafted polyvinyl fluoride, methyl vinyl silicone rubber, vulcanizing agent 1 and reinforcing filler are added to an open mill in a mass ratio of 1-2:4-8:0.02-0.04:1-2. The roller temperature is 150-170 °C, and after mixing for 15-25 min until uniform, it is vulcanized at 180-200 °C for 20-30 min to obtain a fluororubber matrix; (2) Mix talcum powder, vinyltriethoxysilane and ethanol in a mass ratio of 1-2:0.1-0.2:3-5, stir and reflux at 60-80 °C for 2-3 h at 300 rpm, then filter and wash with ethanol 2-4 times, and dry to constant weight at 60 °C under a vacuum of 0.1 kPa to obtain silanized talcum powder; Mix silanized talcum powder, diethyl vinylphosphonate and ethanol in a mass ratio of 1-2:0.5-0.15:2-4, and place it at 60 under a Coγ-ray irradiation source, irradiate at a dose rate of 5 kGy / h for 2-4 h, wash the product with ethanol 3 times, and dry to constant weight at 60 °C under a vacuum of 0.1 kPa to obtain the self-made modified filler; (3) Mix fluororubber matrix, self-made modified filler, vulcanizing agent 2 and co-crosslinking agent according to the mass ratio 1 - 2:0.2 - 0.6:0.01 - 0.05:0.01 - 0.02, add them to an internal mixer, mix at 150 - 170 °C for 10 - 20 min, and then vulcanize at 190 - 200 °C for 10 - 15 min to obtain the self-made fluororubber composite material.

2. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, characterized in that, The polyvinyl fluoride powder in step (1): The particle size is 50 - 150 μm.

3. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, characterized in that, The organic solvent in step (1): Methanol.

4. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, wherein, The inhibitor in step (1) is: Ammonium ferrous sulfate hexahydrate.

5. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, characterized in that The methyl vinyl silicone rubber in step (1): The vinyl content is 10 - 30 mol%, and the molecular weight is 450,000 - 700,000.

6. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, characterized in that, The vulcanizing agent 1 in step (1) is: 2,5 - Dimethyl - 2,5 - di - tert - butylperoxyhexane.

7. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, wherein, The reinforcing filler in step (1) is: Fumed silica.

8. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, characterized in that The talc powder in step (2): The particle size is 5 - 10 μm.

9. The high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, characterized in that, The vulcanizing agent 2 in step (3) is: Diisopropylbenzene peroxide.

10. A high-temperature resistant and flame-retardant fluororubber composite material for a power distribution cabinet according to claim 1, characterized in that, The co - crosslinking agent in step (3): Triallyl isocyanurate.

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