CN116144126A - High-temperature-resistant and tear-resistant conductive rubber composite material and preparation method thereof - Google Patents
High-temperature-resistant and tear-resistant conductive rubber composite material and preparation method thereof Download PDFInfo
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- CN116144126A CN116144126A CN202211590034.1A CN202211590034A CN116144126A CN 116144126 A CN116144126 A CN 116144126A CN 202211590034 A CN202211590034 A CN 202211590034A CN 116144126 A CN116144126 A CN 116144126A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 60
- 239000002131 composite material Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title description 4
- 229920001973 fluoroelastomer Polymers 0.000 claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000006229 carbon black Substances 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 14
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 14
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 14
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 13
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 13
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 12
- 239000010439 graphite Substances 0.000 claims abstract description 12
- ZFVMWEVVKGLCIJ-UHFFFAOYSA-N bisphenol AF Chemical compound C1=CC(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C=C1 ZFVMWEVVKGLCIJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004203 carnauba wax Substances 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000004073 vulcanization Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 3
- 239000004519 grease Substances 0.000 abstract description 2
- 238000004513 sizing Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 125000001153 fluoro group Chemical group F* 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 241000227425 Pieris rapae crucivora Species 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 239000012936 vulcanization activator Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-temperature-resistant and tear-resistant conductive rubber composite material which is prepared from the following components in parts by weight: 100 parts of fluororubber, 3-10 parts of carbon nano tube, 10-20 parts of white carbon black, 5-10 parts of graphite, 5-10 parts of magnesium oxide, 3-6 parts of calcium hydroxide, 1-2 parts of palm wax, 1-2 parts of bisphenol AF and 0.3-1 part of accelerator BPP. The rubber composite material has the characteristics of high temperature resistance, tearing resistance, electric conduction, grease resistance, chemical corrosion resistance and the likeResistivity of up to 10 0 Compared with the traditional superconducting material, the omega-cm level has the characteristics of low cost, better tearing performance and better mechanical property, and can be applied to the scenes of conduction, electromagnetic protection, electric corrosion protection and the like.
Description
Technical Field
The invention belongs to the field of rubber, relates to conductive rubber, and in particular relates to a high-temperature-resistant and tear-resistant conductive rubber composite material.
Background
With the development of society and the progress of technology, the application range of the rubber composite material is wider and wider, and the requirement on the rubber composite material is higher and higher. The composite conductive rubber material is a functional composite material prepared by mixing and vulcanizing a rubber material filled with conductive filler, and can play a role in protecting equipment from static electricity, electromagnetic protection, electric corrosion protection and the like by utilizing the conductive characteristic of the composite conductive rubber material.
At present, the conductive rubber material mainly has the defects of higher resistivity and poorer conductive performance, and can not meet the requirements of special scenes. For example, in the running process of the motor, the rotating shaft and the bearing generate voltage, and the voltage is high to a certain degree, so that discharge can be generated, the bearing is ablated, and finally, equipment is stopped. More and more mechanical equipment has a limit rotation speed of 2-3 ten thousand revolutions per minute, and the rubber composite material needs to have the characteristics of high temperature resistance, tear resistance, wear resistance and the like at the same time so as to be directly applied to a high-rotation-speed scene.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant and tear-resistant conductive rubber composite material which can be applied to places with high rotating speed environments and high conductive performance requirements.
The invention aims at realizing the following technical scheme:
the high-temperature-resistant and tear-resistant conductive rubber composite material is prepared from the following components in parts by weight: 100 parts of fluororubber, 3-10 parts of carbon nano tube, 10-20 parts of white carbon black, 5-10 parts of graphite, 5-10 parts of magnesium oxide, 3-6 parts of calcium hydroxide, 1-2 parts of palm wax, 1-2 parts of bisphenol AF and 0.3-1 part of accelerator BPP.
The fluororubber is 26 fluororubber.
Preferably, the fluororubber is a low mooney viscosity 26 type fluororubber or a combination of a low mooney viscosity 26 type fluororubber and a high mooney viscosity 26 type fluororubber.
When the fluororubber is a combination of low-Mooney-viscosity 26 fluororubber and high-Mooney-viscosity 26 fluororubber, the mass ratio of the low-Mooney-viscosity fluororubber to the high-Mooney-viscosity fluororubber is 30:70-100:0.
The Mooney viscosity of the low Mooney viscosity 26 type fluororubber is 30 (ML) (1+10min) 121 ℃); the Mooney viscosity of the high Mooney viscosity 26 type fluororubber is 50 (ML) (1+10min) 121℃)。
Specifically, the low mooney viscosity 26 type fluororubber may be selected from fluororubber 2601, and the high mooney viscosity 26 type fluororubber is selected from fluororubber 2602.
The diameter of the carbon nano tube is 9nm, and the length is 10-70 mu m.
The white carbon black is alkaline white carbon black (pH is more than 7.5 and less than 9.0); specifically, the white carbon black is white carbon black ER (pH is 8.1).
The fixed carbon content of the graphite is more than 80%.
The magnesium oxide is high-activity magnesium oxide. In general, the specific surface area of the highly active magnesium oxide is > 120m 2 /g。
The calcium hydroxide is high-purity calcium hydroxide with the purity more than 97%; specifically, calcium hydroxide NICC5000 (purity 97.7%) can be selected.
The invention also aims to provide a preparation method of the high-temperature-resistant and tear-resistant conductive rubber composite material, which comprises the following steps:
the roller temperature of the open mill is regulated to 40-50 ℃, the open mill is used for premixing fluororubber and carbon nano tubes, after materials are completely mixed, the thin-pass treatment is carried out for 4 times, and the rolling is carried out and then the rolling is carried out for 16 hours;
step (2), regulating the roller temperature of an open mill to 50-60 ℃, wrapping the mixed material obtained in the step (1) on the open mill, adding white carbon black, graphite, magnesium oxide, calcium hydroxide and palm wax, mixing, adding bisphenol AF and accelerator BPP after the materials are completely mixed, and carrying out thin ventilation for 3 times and rolling for 3 times after the bisphenol AF and the accelerator BPP are completely eaten to obtain a rubber compound;
step (3), vulcanizing and forming the mixed rubber at 160-175 ℃ by adopting a flat vulcanizing machine; and (3) performing secondary vulcanization at the temperature of 200-220 ℃ by adopting an oven to obtain the high-temperature-resistant and tear-resistant conductive rubber composite material.
In the step (3), the secondary vulcanization time is 10-15 h.
The invention also aims to provide the application of the high-temperature-resistant and tear-resistant conductive rubber composite material in preparing a bearing sealing piece. The bearing sealing piece made of the high-temperature-resistant and tear-resistant conductive rubber composite material provided by the invention can run for a long time at a higher rotating speed and a higher temperature, and conductive paths are provided on the inner side and the outer side of the bearing, so that the bearing can be protected against electric corrosion, and the running of equipment is more stable.
The invention has the beneficial effects that:
according to the invention, fluororubber is selected as a matrix, and carbon nanotubes are selected as a conductive auxiliary agent, so that in fluororubber macromolecules, fluorine atom electronegativity is extremely strong, C-F bond energy is large, and covalent radius of fluorine atoms is small, so that main chains of fluororubber macromolecules have excellent stability, and fluororubber has the characteristics of high temperature resistance, oil resistance, chemical corrosion resistance and the like. The carbon nano tube is a typical one-dimensional nano material, has excellent electric conduction and heat transfer properties, and the electric conductivity of the carbon nano tube can reach 10 6 S/m can pass higher current density, the thermal conductivity is more than 3000W/(m.K), the heat transfer performance is excellent, the invention can give consideration to the processing performance of sizing material by controlling the dosage of the carbon nano tube, and can endow sizing material with excellent electric conductivity and tear resistance, meanwhile, the alkaline white carbon black is more resistant to high temperature than common carbon black (such as thermal cracking carbon black N990), and after the alkaline white carbon black is added, the composite material has better hot tear resistance. The common white carbon black has poor technological properties of the sizing material, particularly the flowing property of the sizing material, and poor compression set, and the alkaline white carbon black is adopted, so that the technological properties of the sizing material are good, and the main component of the white carbon black is SiO 2 ，SiO 2 Has the following characteristics ofHigh temperature resistance and incombustibility, and has the reinforcing effect, and the hardness and heat resistance of the product are improved. Graphite is a flaky crystal of carbon, and can transfer heat, conduct electricity and resist high temperature. Magnesium oxide is used as an acid absorbent to neutralize the hydrogen fluoride separated out in the vulcanization process; calcium hydroxide is used in fluororubber and is used as both an acid absorbent and a vulcanization activator; meanwhile, magnesium oxide and calcium hydroxide are used as a vulcanization active agent and a heat stabilizer at the same time, and play a role in activation in the vulcanization process, so that the crosslinking speed is improved; endows the vulcanized rubber with better heat stability. The palm wax has the function of improving processability, and has the function of internal lubrication to improve fluidity and mold release. The vulcanizing agent bisphenol AF and the accelerator BPP have the function of vulcanizing and molding the composite material.
Under the cooperation of fluororubber, carbon nano tube, graphite and white carbon black, on one hand, the sizing material can resist higher temperature for a long time, on the other hand, the carbon nano tube and the graphite can rapidly conduct heat generated by a heat generating part to a low-temperature part, so that the high-temperature resistance is improved, and meanwhile, the rubber composite material has excellent tearing resistance and conductivity; the rubber composite material has the excellent characteristics of high temperature resistance, tearing resistance, conductivity, grease resistance, chemical corrosion resistance and the like, and the resistivity reaches 10 0 Compared with the traditional superconducting material (filled metal powder and metal fiber), the omega-cm level has the characteristics of low cost, better tearing performance and better mechanical property, and can be applied to the scenes of conduction, electromagnetic protection, electric corrosion protection and the like.
If the component made of the high-temperature-resistant and tear-resistant conductive rubber composite material is used in a motor use place, the shaft voltage can be reduced, so that the ablation protection function is realized, and the service life of equipment is prolonged; the high-temperature-resistant and tear-resistant conductive rubber composite material has excellent conductivity, can greatly reduce the shaft voltage, for example, the shaft voltage can be reduced from 20V to 5V in practical application, and has excellent electric corrosion protection effect.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in further detail with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are obtained by a person skilled in the art without making any inventive effort, are within the scope of the invention.
TABLE 1 formulation of high temperature resistant tear resistant conductive rubber composites (unit: parts by mass) example 1-example 4
Note that: the fixed carbon content of graphite A-O is 83.4%; the specific surface area of the high-activity magnesium oxide is 150m 2 /g。
Example 1
The high-temperature-resistant and tear-resistant conductive rubber composite material is prepared by the following components in parts by weight as shown in table 1:
the roller temperature of an open mill is regulated to 40 ℃, fluororubber and carbon nanotubes are premixed through the open mill, after materials are completely mixed, the thin-pass treatment is carried out for 4 times, and the rolling is carried out and then the rolling is carried out for 16 hours;
step (2), regulating the roller temperature of an open mill to 60 ℃, wrapping the mixed material obtained in the step (1) on the open mill, adding alkaline white carbon black ER, graphite A-O, high-activity magnesium oxide, calcium hydroxide and palm wax, mixing, adding a vulcanizing agent (bisphenol AF) and an accelerator BPP after the materials are completely mixed, and carrying out thin pass for 3 times after the vulcanizing agent and the accelerator are completely eaten, and rolling for 3 times to obtain a rubber compound;
and (3) vulcanizing and forming the mixed rubber at 170 ℃ by adopting a flat vulcanizing machine, and then performing secondary vulcanization for 15 hours at 200 ℃ by adopting an oven to obtain the high-temperature-resistant and tear-resistant conductive rubber composite material.
Example 2
The high-temperature-resistant and tear-resistant conductive rubber composite material is prepared by the method of example 1, wherein the components and the mass parts of the conductive rubber composite material are shown in table 1.
Example 3
The high-temperature-resistant and tear-resistant conductive rubber composite material is prepared by the method of example 1, wherein the components and the mass parts of the conductive rubber composite material are shown in table 1.
Example 4
The high-temperature-resistant and tear-resistant conductive rubber composite material is prepared by the method of example 1, wherein the components and the mass parts of the conductive rubber composite material are shown in table 1.
Comparative example 1
The components and parts by weight of the rubber composite are shown in Table 1, and the rubber composite is prepared by the method of example 1.
Comparative example 2
The components and parts by weight of the rubber composite are shown in Table 1, and the rubber composite is prepared by the method of example 1.
The high temperature resistant, tear resistant conductive rubber composites prepared in examples 1-4 and the rubber composites prepared in comparative examples 1-2 were tested for performance and the results are shown in Table 2.
TABLE 2 results of performance measurements of high temperature resistant, tear resistant conductive rubber composites of example 1-example 4
As shown in Table 2, the resistivity level of the rubber composite material reaches 100 Ω & cm, and the rubber composite material has excellent conductivity, and also has better high-temperature aging resistance and tear resistance.
The invention has been described in detail by the above examples of the high temperature resistant and tear resistant conductive rubber composite material, and it is obvious to those skilled in the art that the formulation and the preparation method of the invention can be modified or appropriately changed and combined to realize the technical scheme of the invention without departing from the content, spirit and scope of the invention. The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the scope of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A high temperature resistant and tear resistant conductive rubber composite material is characterized in that: the composite material is prepared from the following components in parts by weight: 100 parts of fluororubber, 3-10 parts of carbon nano tube, 10-20 parts of white carbon black, 5-10 parts of graphite, 5-10 parts of magnesium oxide, 3-6 parts of calcium hydroxide, 1-2 parts of palm wax, 1-2 parts of bisphenol AF and 0.3-1 part of accelerator BPP.
2. The high temperature, tear resistant, electrically conductive rubber composite of claim 1, wherein: the fluororubber is 26 fluororubber.
3. The high temperature resistant, tear resistant, electrically conductive rubber composite of claim 1 or 2, wherein: the fluororubber is low-Mooney-viscosity 26 fluororubber or a combination of low-Mooney-viscosity 26 fluororubber and high-Mooney-viscosity 26 fluororubber; when the fluororubber is a combination of low-Mooney-viscosity 26 fluororubber and high-Mooney-viscosity 26 fluororubber, the mass ratio of the low-Mooney-viscosity fluororubber to the high-Mooney-viscosity fluororubber is 30:70-100:0.
4. A high temperature, tear resistant, electrically conductive rubber composite as in claim 3, wherein: the Mooney viscosity of the low Mooney viscosity 26 type fluororubber is 30 (ML) (1+10min) 121 ℃); the Mooney viscosity of the high Mooney viscosity 26 type fluororubber is 50 (ML) (1+10min) 121℃)。
5. The high temperature, tear resistant, electrically conductive rubber composite of claim 1, wherein: the diameter of the carbon nano tube is 9nm, and the length is 10-70 mu m.
6. The high temperature, tear resistant, electrically conductive rubber composite of claim 1, wherein: the white carbon black is alkaline white carbon black.
7. The high temperature, tear resistant, electrically conductive rubber composite of claim 1, wherein: the fixed carbon content of the graphite is more than 80%.
8. The high temperature, tear resistant, electrically conductive rubber composite of claim 1, wherein: the magnesium oxide is high-activity magnesium oxide; the calcium hydroxide is high-purity calcium hydroxide with the purity more than 97 percent.
9. A method for preparing the high temperature resistant and tear resistant conductive rubber composite material of claim 1, which is characterized by: comprising the following steps:
the roller temperature of the open mill is regulated to 40-50 ℃, the open mill is used for premixing fluororubber and carbon nano tubes, after materials are completely mixed, the thin-pass treatment is carried out for 4 times, and the rolling is carried out and then the rolling is carried out for 16 hours;
step (2), regulating the roller temperature of an open mill to 50-60 ℃, wrapping the mixed material obtained in the step (1) on the open mill, adding white carbon black, graphite, magnesium oxide, calcium hydroxide and palm wax, mixing, adding bisphenol AF and accelerator BPP after the materials are completely mixed, and carrying out thin ventilation for 3 times and rolling for 3 times after the bisphenol AF and the accelerator BPP are completely eaten to obtain a rubber compound;
step (3), vulcanizing and forming the mixed rubber at 160-175 ℃ by adopting a flat vulcanizing machine; and (3) performing secondary vulcanization at the temperature of 200-220 ℃ by adopting an oven to obtain the high-temperature-resistant and tear-resistant conductive rubber composite material.
10. Use of the high temperature resistant, tear resistant, conductive rubber composite of claim 1 in the manufacture of a bearing seal.
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