High-temperature-resistant and high-reliability conductive rubber material and preparation thereof

Abstract

The invention relates to a high-temperature-resistant and high-reliability conductive rubber material and preparation thereof, and belongs to the technical field of rubber materials. The conductive rubber material is prepared from the following raw materials: vinyl silicone oil, modified white carbon black, methyl silicone oil, hydrogen-containing silicone oil, an inhibitor, a catalyst, modified conductive powder, a thixotropic agent, a flame retardant, a dispersing agent and a solvent. The modified white carbon black is self-made and added into the preparation process of the rubber material, so that the high-temperature resistance of the prepared rubber material finished product is effectively improved; graphene with high conductivity is used as a conductive powder matrix, a nitric acid solution and a sulfuric acid solution are firstly used for treating graphene, then nickel-plated graphite and polyaniline are added for modification, the modified conductive powder obtained after modification has excellent conductivity, and meanwhile, the modified conductive powder is used as one of preparation raw materials of a rubber material, so that the conductivity of the rubber material is greatly improved. And meanwhile, the rubber material has excellent conductivity.

Description

Technical Field

[0001] The present invention belongs to the technical field of rubber materials, and in particular, relates to a high-temperature resistant and highly reliable conductive rubber material and its preparation. Background Art

[0002] With the rapid development of modern science and technology, the requirements for material performance in many fields such as electronics, electrical, communications, aerospace, etc. are becoming increasingly stringent. Conductive rubber has both the flexibility of rubber and a certain degree of conductivity, and can play the role of conductive connection, electromagnetic shielding, and anti-static in electronic equipment; at the same time, conductive rubber is also a functional material with multiple functions, such as high temperature resistance, high strength, and corrosion resistance. However, traditional conductive rubber materials currently on the market often face problems such as reduced heat resistance and reduced conductivity in many application scenarios under high temperature environments, making it difficult to meet actual needs.

[0003] Therefore, in order to solve the above problems, it is of great practical significance to provide a rubber material that is resistant to high temperatures and has good electrical conductivity. Summary of the invention

[0004] The purpose of the present invention is to provide a high-temperature resistant and highly reliable conductive rubber material and its preparation, which solves the problem of poor high-temperature resistance and poor conductivity of the rubber material in the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A high-temperature resistant and highly reliable conductive rubber material, the conductive rubber material comprising the following raw materials in parts by weight:

[0007]

[0008]

[0009] As a preferred technical solution of the present invention, the conductive rubber material further comprises 0-1 parts by weight of a thixotropic agent, 0-4 parts by weight of a flame retardant and 0-5 parts by weight of a dispersant.

[0010] Furthermore, the thixotropic agent includes hydrogenated castor oil; the flame retardant includes at least one of aluminum hydroxide, magnesium hydroxide, zinc borate and zinc oxide; and the dispersant includes any one of span80 and stearic acid monoglyceride.

[0011] Furthermore, the mass ratio of the aluminum hydroxide, magnesium hydroxide, zinc borate and zinc oxide is 2-3:2-2.5:1-2:1.5-2.5.

[0012] As a preferred technical solution of the present invention, the vinyl silicone oil includes vinyl silicone oil with a viscosity of 5000 MPa·s and vinyl silicone oil with a viscosity of 100000 MPa·s in equal weight.

[0013] As a preferred technical solution of the present invention, the preparation method of the modified white carbon black comprises:

[0014] Tetramethyldivinyldisilazane, hexamethyldisilazane and an alcohol solvent are mixed uniformly to obtain a mixed liquid, nitrogen is passed through, the mixed liquid is added to white carbon black, the temperature is controlled and stirred uniformly, the pH value is adjusted, sulfuric acid ethanol solution is added while stirring and dispersing uniformly at the temperature, then sodium silicate aqueous solution is added and stirred and dispersed uniformly, the temperature is controlled and stirred again, and filtered to obtain modified white carbon black.

[0015] Furthermore, the volume ratio of tetramethyldivinyldisilazane, hexamethyldisilazane and alcohol solvent is 4-4.5:1-1.2:14-16; the mass ratio of white carbon black, mixed solution, ethanol sulfuric acid solution and sodium silicate aqueous solution is 1:0.1-0.12:0.05-0.06:0.05-0.06.

[0016] Furthermore, the alcohol solvent includes ethanol or butanol; the white carbon black includes any one of fumed white carbon black and precipitated white carbon black, and the specific surface area of ​​the white carbon black is 200-300m 2 / g.

[0017] Furthermore, the temperature of the temperature control is 75-80°C; the pH is adjusted by using a sodium hydroxide solution with a concentration of 1 mol / L to adjust the pH to 9-9.5; the temperature of the re-temperature control stirring is 75-80°C, and the time is 4-5h.

[0018] Furthermore, the concentration of the sulfuric acid ethanol solution is 0.1 mol / L; the concentration of the sodium silicate aqueous solution is 0.15 mol / L.

[0019] As a preferred technical solution of the present invention, the inhibitor includes any one of tetramethyltetravinylcyclotetrasiloxane, tetramethyldivinyldisiloxane, methylbutynol and cyclohexynol.

[0020] As a preferred technical solution of the present invention, the catalyst includes any one of chloroplatinic acid and platinum tetrachloride.

[0021] As a preferred technical solution of the present invention, the method for preparing the modified conductive powder comprises:

[0022] S1. Evenly mix the nitric acid solution and the sulfuric acid solution, add graphene, control the temperature and reflux, filter, centrifuge, wash, control the temperature and vacuum dry to obtain an intermediate powder A;

[0023] S2, mixing the intermediate powder A, nickel-plated graphite, hexachlorotriphosphazene and anhydrous ethanol and ultrasonically dispersing them, then stirring under controlled temperature, filtering with suction, taking the filter residue, introducing argon gas, heating and maintaining the temperature, and cooling to obtain the intermediate powder B;

[0024] S3, polyaniline and methyl pyrrolidone are mixed to form a solution, the intermediate powder B is added thereto, ultrasonic stirring is performed, the filter residue is taken out, argon gas is introduced to dry it, and a modified conductive powder is obtained.

[0025] As a preferred technical solution of the present invention, the usage ratio of the nitric acid solution, the sulfuric acid solution and the graphene in step S1 is 3-4 mL: 1-2 mL: 1-1.2 g.

[0026] As a preferred technical solution of the present invention, the concentration of the nitric acid solution in step S1 is 6 mol / L, and the concentration of the sulfuric acid solution is 8 mol / L; the temperature of the temperature-controlled reflux is 120-125°C, and the time is 3-4h; the washing is washing with deionized water until neutral; the temperature of the temperature-controlled vacuum drying is 60-65°C.

[0027] As a preferred technical solution of the present invention, the dosage ratio of the intermediate powder A, nickel-plated graphite, hexachlorotripolyphosphazene and anhydrous ethanol in step S2 is 0.1-0.15 mg: 0.05-0.07 mg: 1-1.1 g: 50-52 mL.

[0028] Furthermore, the nickel-plated graphite is nano-grade, model FNS64-20, purchased from Shanghai Baitu High-tech Materials Co., Ltd.

[0029] As a preferred technical solution of the present invention, the ultrasonic dispersion time in step S2 is 3-4h; the temperature of the temperature-controlled stirring is 60-65°C, and the time is 3-4h; the heating and constant temperature is specifically heating to 900-910°C at a heating rate of 5°C / min and maintaining the temperature for 30-60min; the cooling is cooling to room temperature.

[0030] As a preferred technical solution of the present invention, the dosage ratio of the solution and the intermediate powder B in step S3 is 5-10 mL: 1-1.2 g.

[0031] As a preferred technical solution of the present invention, the solution in step S3 is a 0.1% polyaniline-methylpyrrolidone solution; and the ultrasonic stirring time is 2-3 hours.

[0032] As a preferred technical solution of the present invention, the solvent includes at least one of toluene and xylene.

[0033] A method for preparing a high-temperature resistant and highly reliable conductive rubber material comprises the following steps:

[0034] Add modified white carbon black and methyl silicone oil to vinyl silicone oil, stir once, then add hydrogenated silicone oil, inhibitor, thixotropic agent, flame retardant and dispersant and stir twice, add modified conductive powder and solvent and stir three times, cool, add catalyst and stir four times to obtain the finished rubber material.

[0035] As a preferred technical solution of the present invention, the first stirring is stirring at 20-50 Hz for 30-40 min; the second stirring and third stirring times are both 30-40 min; the cooling is cooling to room temperature; and the fourth stirring time is 0.5-1 h.

[0036] Beneficial effects of the present invention:

[0037] (1) The modified silica is prepared by modifying silica and added to the rubber material during the preparation process. The modified silica can interact with the molecular chains of the system to disperse heat and prevent local overheating, thereby effectively increasing the high temperature resistance of the finished rubber material.

[0038] (2) The present invention uses graphene, which has high conductivity, as a conductive powder matrix, and first treats it with a nitric acid solution and a sulfuric acid solution to improve the dispersibility of the graphene. Then, nickel-plated graphite is added as a spacer material for the graphene, which further effectively reduces the agglomeration in the graphite layer and solves the problem that the conjugated structure of the graphene itself causes it to agglomerate together in a multi-layer stacking manner in a natural state; on this basis, polyaniline is added to interact with the graphene, which promotes the formation of the graphene conductive and thermal conductive path. Therefore, the modified conductive powder obtained thereby has excellent conductivity. The modified conductive powder is used as one of the raw materials for the rubber material, which can also make the rubber material have excellent conductivity. DETAILED DESCRIPTION

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1

[0041] A high-temperature resistant and highly reliable conductive rubber material, the conductive rubber material comprising the following raw materials in parts by weight:

[0042] 75 parts by weight of vinyl silicone oil, 5 parts by weight of modified white carbon black, 17.5 parts by weight of methyl silicone oil, 17.5 parts by weight of hydrogenated silicone oil, 0.5 parts by weight of inhibitor, 2.5 parts by weight of catalyst, 150 parts by weight of modified conductive powder, and 10 parts by weight of solvent;

[0043] The vinyl silicone oil comprises vinyl silicone oil with a viscosity of 5000 MPa·s and vinyl silicone oil with a viscosity of 100000 MPa·s in equal weight; the inhibitor comprises tetramethyltetravinylcyclotetrasiloxane; the catalyst comprises chloroplatinic acid; and the solvent comprises toluene.

[0044] The preparation method of the modified white carbon black comprises:

[0045] Tetramethyldivinyldisilazane, hexamethyldisilazane and ethanol are mixed in a volume ratio of 4.2:1:14 to obtain a mixed solution, nitrogen is passed through, the mixed solution is added to white carbon black, the temperature is controlled at 75°C and stirred evenly, a sodium hydroxide solution with a concentration of 1 mol / L is used to adjust the pH to 9, 0.1 mol / L sulfuric acid ethanol solution is added while stirring and dispersed evenly at the temperature, and then 0.15 mol / L sodium silicate aqueous solution is added and stirred and dispersed evenly, and the temperature is controlled at 75°C and stirred for 4.5 hours, and filtered to obtain modified white carbon black;

[0046] The white carbon black has a specific surface area of ​​200m 2 / g of precipitated silica;

[0047] The mass ratio of the white carbon black, the mixed solution, the ethanolic sulfuric acid solution and the aqueous sodium silicate solution is 1:0.1:0.055:0.05.

[0048] The preparation method of the modified conductive powder comprises:

[0049] S1. Mix 6 mol / L nitric acid solution and 8 mol / L sulfuric acid solution evenly, add graphene, control the temperature at 120℃ and reflux for 3.5h, filter, centrifuge, wash with deionized water until neutral, control the temperature at 60℃. Vacuum dry to obtain intermediate powder A;

[0050] The usage ratio of the nitric acid solution, the sulfuric acid solution and the graphene is 3 mL:1 mL:1.1 g;

[0051] S2, the intermediate powder A, nickel-plated graphite, hexachlorotripolyphosphazene and anhydrous ethanol were mixed and ultrasonically dispersed for 3 hours, then the temperature was controlled at 62.5°C and stirred for 4 hours, filtered, the filter residue was taken, argon was introduced, the temperature was increased to 900°C at a heating rate of 5°C / min and the temperature was kept constant for 30 minutes, and then cooled to room temperature to obtain intermediate powder B;

[0052] The dosage ratio of the intermediate powder A, nickel-plated graphite, hexachlorotriphosphazene and anhydrous ethanol is 0.1 mg: 0.0 mg: 1 g: 50 mL;

[0053] S3, polyaniline and methyl pyrrolidone are mixed to prepare a 0.1% polyaniline-methyl pyrrolidone solution, the intermediate powder B is added and ultrasonically stirred for 2 hours, the filter is filtered, the filter residue is taken, and argon gas is passed through to dry to obtain a modified conductive powder;

[0054] The usage ratio of the 0.1% polyaniline-methylpyrrolidone solution to the intermediate powder B is 7.5 mL:1 g.

[0055] A method for preparing a high-temperature resistant and highly reliable conductive rubber material comprises the following steps:

[0056] Add modified white carbon black and methyl silicone oil to vinyl silicone oil, stir at 20 Hz for 35 minutes, then add hydrogenated silicone oil and inhibitor and stir for 40 minutes, add modified conductive powder and solvent and stir for 30 minutes, cool to room temperature, add catalyst and stir for 0.5 hours to obtain the finished rubber material.

[0057] Example 2

[0058] A high-temperature resistant and highly reliable conductive rubber material, the conductive rubber material comprising the following raw materials in parts by weight:

[0059] 50 parts by weight of vinyl silicone oil, 17.5 parts by weight of modified white carbon black, 5 parts by weight of methyl silicone oil, 30 parts by weight of hydrogenated silicone oil, 5 parts by weight of inhibitor, 5 parts by weight of catalyst, 300 parts by weight of modified conductive powder, 50 parts by weight of solvent, 0.5 parts by weight of thixotropic agent, 4 parts by weight of flame retardant, and 5 parts by weight of dispersant;

[0060] The thixotropic agent includes hydrogenated castor oil; the flame retardant includes aluminum hydroxide and magnesium hydroxide in a mass ratio of 2.5:2.3; the dispersant includes stearic acid monoglyceride;

[0061] The vinyl silicone oil comprises a vinyl silicone oil with a viscosity of 5000 MPa·s and a vinyl silicone oil with a viscosity of 100000 MPa·s in equal weight; the inhibitor comprises tetramethyl divinyl disiloxane; the catalyst comprises platinum tetrachloride; and the solvent comprises xylene;

[0062] The preparation method of the modified white carbon black comprises:

[0063] Tetramethyldivinyldisilazane, hexamethyldisilazane and butanol were mixed in a volume ratio of 4.5:1.1:16 to obtain a mixed solution, nitrogen was passed through, the mixed solution was added to white carbon black, the temperature was controlled at 77.5°C and stirred evenly, a 1 mol / L sodium hydroxide solution was used to adjust the pH to 9.5, 0.1 mol / L sulfuric acid ethanol solution was added while stirring and dispersed evenly, and then 0.15 mol / L sodium silicate aqueous solution was added and stirred and dispersed evenly, and the temperature was controlled at 77.5°C and stirred for 4 hours, and filtered to obtain modified white carbon black;

[0064] The white carbon black has a specific surface area of ​​250 m 2 / g of precipitated silica;

[0065] The mass ratio of the white carbon black, the mixed solution, the ethanolic sulfuric acid solution and the aqueous sodium silicate solution is 1:0.12:0.05:0.06.

[0066] The preparation method of the modified conductive powder comprises:

[0067] S1. Mix 6 mol / L nitric acid solution and 8 mol / L sulfuric acid solution evenly, add graphene, control the temperature at 123℃ and reflux for 3h, filter and centrifuge, wash with deionized water until neutral, control the temperature at 605℃, and vacuum dry to obtain intermediate powder A;

[0068] The usage ratio of the nitric acid solution, the sulfuric acid solution and the graphene is 3.5 mL:1.5 mL:1.2 g;

[0069] S2, the intermediate powder A, nickel-plated graphite, hexachlorotripolyphosphazene and anhydrous ethanol were mixed and ultrasonically dispersed for 3.5 hours, then the mixture was stirred at 60°C for 3 hours, filtered, the filter residue was taken, argon was introduced, the temperature was increased to 905°C at a heating rate of 5°C / min and the temperature was kept constant for 45 minutes, and the mixture was cooled to room temperature to obtain the intermediate powder B;

[0070] The usage ratio of the intermediate powder A, nickel-plated graphite, hexachlorotriphosphazene and anhydrous ethanol is 0.15 mg: 0.07 mg: 1.05 g: 52 mL;

[0071] S3, polyaniline and methyl pyrrolidone are mixed to prepare a 0.1% polyaniline-methyl pyrrolidone solution, the intermediate powder B is added, ultrasonic stirring is performed for 2.5 hours, and the filter residue is taken out, and argon gas is passed through to dry to obtain a modified conductive powder;

[0072] The usage ratio of the 0.1% polyaniline-methylpyrrolidone solution to the intermediate powder B is 5 mL:1.1 g.

[0073] A method for preparing a high-temperature resistant and highly reliable conductive rubber material comprises the following steps:

[0074] Add modified white carbon black and methyl silicone oil to vinyl silicone oil, stir at 30 Hz for 40 minutes, then add hydrogenated silicone oil, inhibitor, thixotropic agent, flame retardant and dispersant and stir for 30 minutes, add modified conductive powder and solvent and stir for 35 minutes, cool to room temperature, add catalyst and stir for 1 hour to obtain the finished rubber material.

[0075] Example 3

[0076] A high-temperature resistant and highly reliable conductive rubber material, the conductive rubber material comprising the following raw materials in parts by weight:

[0077] 100 parts by weight of vinyl silicone oil, 30 parts by weight of modified white carbon black, 30 parts by weight of methyl silicone oil, 5 parts by weight of hydrogenated silicone oil, 10 parts by weight of inhibitor, 0.1 parts by weight of catalyst, 225 parts by weight of modified conductive powder, 30 parts by weight of solvent, 1 part by weight of thixotropic agent, 2 parts by weight of flame retardant, and 2.5 parts by weight of dispersant;

[0078] The thixotropic agent includes hydrogenated castor oil; the flame retardant includes magnesium hydroxide, zinc borate and zinc oxide in a mass ratio of 2.3:1.5:2; the dispersant includes span80;

[0079] The vinyl silicone oil comprises vinyl silicone oil with a viscosity of 5000 MPa·s and vinyl silicone oil with a viscosity of 100000 MPa·s in equal weight; the inhibitor comprises cyclohexanol; the catalyst comprises chloroplatinic acid; and the solvent comprises xylene.

[0080] The preparation method of the modified white carbon black comprises:

[0081] Tetramethyldivinyldisilazane, hexamethyldisilazane and ethanol are mixed in a volume ratio of 4:1.2:15 to obtain a mixed solution, nitrogen is passed through, the mixed solution is added to white carbon black, the temperature is controlled at 80°C and stirred evenly, a sodium hydroxide solution with a concentration of 1 mol / L is used to adjust the pH to 9.3, 0.1 mol / L sulfuric acid ethanol solution is added while stirring and dispersed evenly at the temperature, and then 0.15 mol / L sodium silicate aqueous solution is added and stirred and dispersed evenly, and the temperature is controlled at 80°C and stirred for 5 hours, and filtered to obtain modified white carbon black;

[0082] The white carbon black has a specific surface area of ​​300m 2 / g of fumed silica;

[0083] The mass ratio of the white carbon black, the mixed solution, the ethanolic sulfuric acid solution and the aqueous sodium silicate solution is 1:0.11:0.06:0.055.

[0084] The preparation method of the modified conductive powder comprises:

[0085] S1. Mix 6 mol / L nitric acid solution and 8 mol / L sulfuric acid solution evenly, add graphene, control the temperature at 125℃ and reflux for 4h, filter and centrifuge, wash with deionized water until neutral, control the temperature at 62.5℃. Vacuum dry to obtain intermediate powder A;

[0086] The usage ratio of the nitric acid solution, the sulfuric acid solution and the graphene is 4 mL:2 mL:1 g;

[0087] S2, the intermediate powder A, nickel-plated graphite, hexachlorotripolyphosphazene and anhydrous ethanol were mixed and ultrasonically dispersed for 4 hours, then the temperature was controlled at 65°C and stirred for 3.5 hours, filtered, the filter residue was taken, argon was introduced, the temperature was increased to 910°C at a heating rate of 5°C / min and the temperature was kept constant for 60 minutes, and then cooled to room temperature to obtain intermediate powder B;

[0088] The dosage ratio of the intermediate powder A, nickel-plated graphite, hexachlorotriphosphazene and anhydrous ethanol is 0.13 mg: 0.05 mg: 1.1 g: 51 mL;

[0089] S3, polyaniline and methyl pyrrolidone are mixed to prepare a 0.1% polyaniline-methyl pyrrolidone solution, the intermediate powder B is added and ultrasonically stirred for 3 hours, the filter is filtered, the filter residue is taken, and argon gas is passed through to dry to obtain a modified conductive powder;

[0090] The usage ratio of the 0.1% polyaniline-methylpyrrolidone solution to the intermediate powder B is 10 mL:1.2 g.

[0091] A method for preparing a high-temperature resistant and highly reliable conductive rubber material comprises the following steps:

[0092] Add modified white carbon black and methyl silicone oil to vinyl silicone oil, stir at 50 Hz for 30 minutes, then add hydrogenated silicone oil, inhibitor, thixotropic agent, flame retardant and dispersant and stir for 35 minutes, add modified conductive powder and solvent and stir for 40 minutes, cool to room temperature, add catalyst and stir for 1 hour to obtain the finished rubber material.

[0093] Comparative Example 1

[0094] Compared with Example 3, the difference is that in Comparative Example 1, the white carbon black is not modified, that is, the modified white carbon black is replaced with a specific surface area of ​​300m 2 / g of fumed silica, and the other operating steps and parameters remained unchanged.

[0095] Comparative Example 2

[0096] Compared with Example 3, the difference is that in the preparation of the modified conductive powder in Comparative Example 2, nickel-plated graphite is not added, and the other operating steps and parameters remain unchanged.

[0097] Comparative Example 3

[0098] Compared with Example 3, the difference is that in the preparation of the modified conductive powder in Comparative Example 3, polyaniline is not added, and the other operation steps and parameters remain unchanged.

[0099] Test Case

[0100] The volume resistivity of the rubber material products obtained in Examples 1-3 and Comparative Examples 1-3 was tested according to the Mil-DTL-83528C method. The electromagnetic shielding effect of the rubber material products obtained in Examples 1-3 and Comparative Examples 1-3 was tested at 40 GHz using a shielding effectiveness tester using a flange coaxial method. The results are shown in Table 1.

[0101] Table 1

[0102]

[0103]

[0104] It can be seen from Table 1 that the rubber material product prepared by the present invention has excellent high temperature resistance and electrical conductivity.

[0105] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A high temperature resistant and highly reliable conductive rubber material, characterized in that: The conductive rubber material comprises the following raw materials in parts by weight:

2. The high temperature resistant and highly reliable conductive rubber material according to claim 1, characterized in that: The conductive rubber material further comprises 0-1 parts by weight of a thixotropic agent, 0-4 parts by weight of a flame retardant and 0-5 parts by weight of a dispersant.

3. The high temperature resistant and highly reliable conductive rubber material according to claim 2, characterized in that: The preparation method of the modified white carbon black comprises: Tetramethyldivinyldisilazane, hexamethyldisilazane and an alcohol solvent are mixed uniformly to obtain a mixed liquid, nitrogen is passed through, the mixed liquid is added to white carbon black, the temperature is controlled and stirred uniformly, the pH value is adjusted, sulfuric acid ethanol solution is added while stirring and dispersing uniformly at the temperature, then sodium silicate aqueous solution is added and stirred and dispersed uniformly, the temperature is controlled and stirred again, and filtered to obtain modified white carbon black.

4. The high temperature resistant and highly reliable conductive rubber material according to claim 3, characterized in that: The volume ratio of tetramethyldivinyldisilazane, hexamethyldisilazane and alcohol solvent is 4-4.5:1-1.2:14-16; the mass ratio of white carbon black, mixed solution, ethanol sulfuric acid solution and sodium silicate aqueous solution is 1:0.1-0.12:0.05-0.06:0.05-0.

06.

5. The high temperature resistant and highly reliable conductive rubber material according to claim 2, characterized in that: The inhibitor includes any one of tetramethyltetravinylcyclotetrasiloxane, tetramethyldivinyldisiloxane, methylbutynol and cyclohexynol; the catalyst includes any one of chloroplatinic acid and platinum tetrachloride; and the solvent includes at least one of toluene and xylene.

6. The high temperature resistant and highly reliable conductive rubber material according to claim 2, characterized in that: The preparation method of the modified conductive powder comprises: S1. Evenly mix the nitric acid solution and the sulfuric acid solution, add graphene, control the temperature and reflux, filter, centrifuge, wash, control the temperature and vacuum dry to obtain an intermediate powder A; S2, mixing the intermediate powder A, nickel-plated graphite, hexachlorotriphosphazene and anhydrous ethanol and ultrasonically dispersing them, then stirring under controlled temperature, filtering with suction, taking the filter residue, introducing argon gas, heating and maintaining the temperature, and cooling to obtain the intermediate powder B; S3, polyaniline and methyl pyrrolidone are mixed to form a solution, the intermediate powder B is added thereto, ultrasonic stirring is performed, suction filtration is performed, the filter residue is taken out, argon gas is introduced to dry it, and a modified conductive powder is obtained.

7. The high temperature resistant and highly reliable conductive rubber material according to claim 6, characterized in that: The usage ratio of the nitric acid solution, the sulfuric acid solution and the graphene in step S1 is 3-4 mL: 1-2 mL: 1-1.2 g.

8. The high temperature resistant and highly reliable conductive rubber material according to claim 6, characterized in that: In step S2, the dosage ratio of the intermediate powder A, nickel-plated graphite, hexachlorotripolyphosphazene and anhydrous ethanol is 0.1-0.15 mg: 0.05-0.07 mg: 1-1.1 g: 50-52 mL.

9. The high temperature resistant and highly reliable conductive rubber material according to claim 6, characterized in that: The dosage ratio of the solution and the intermediate powder B in step S3 is 5-10 mL: 1-1.2 g.

10. A method for preparing a high temperature resistant and highly reliable conductive rubber material as claimed in any one of claims 2 to 9, characterized in that: The steps include: Add modified white carbon black and methyl silicone oil to vinyl silicone oil, stir once, then add hydrogenated silicone oil, inhibitor, thixotropic agent, flame retardant and dispersant and stir twice, add modified conductive powder and solvent and stir three times, cool, add catalyst and stir four times to obtain the finished rubber material.

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