CN115704184A - Preparation method of insulating heat-conducting carbon fiber for thermal interface material - Google Patents
Preparation method of insulating heat-conducting carbon fiber for thermal interface material Download PDFInfo
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- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 3
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 3
- RSKGMYDENCAJEN-UHFFFAOYSA-N hexadecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCCCCCC[Si](OC)(OC)OC RSKGMYDENCAJEN-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
The invention belongs to the field of carbon fiber surface treatment technology and thermal interface materials, and particularly relates to a preparation method of an insulating heat-conducting carbon fiber for a thermal interface material. Preparation of SiO by sol-gel method 2 Sol, then mixing the carbon fiber and SiO 2 Mixed, siO 2 Can be easily and uniformly coated on the surface of the carbon fiber to form a coating. At high temperatureUnder part, siO 2 Conversion to SiC or Si 3 N 4 Thereby evenly cladding on the carbon fiber surface, realizing the purpose of carbon fiber insulation. And meanwhile, uniformly mixing the carbon fibers coated with the insulation layer with the liquid silicone rubber, applying an electric field to realize the directional orientation of the carbon fibers, and preparing the high-heat-conductivity and soft thermal interface material.
Description
Technical Field
The invention belongs to the field of carbon fiber surface treatment technology and thermal interface materials, and particularly relates to a preparation method of insulating heat-conducting carbon fibers for a thermal interface material.
Background
The carbon fiber has good mechanical properties such as Gao Bijiang, high specific modulus, good thermal and electrical properties and the like, so that the carbon fiber is widely applied to various composite materials as a reinforcing phase. The black gold has high application value in the fields of aerospace, automobiles, energy, sports and leisure, and is called as black gold in the 21 st century.
Nowadays, electronic components is now towards the miniaturization, integrates the equidirectional development such as, and the unit volume energy consumption is bigger and bigger, produces more and more heat in the course of the work, and the heat if can not in time conduct away, can reduce the work efficiency of equipment, shortens equipment life even. The thermal interface material has good thermal conductivity, and is widely applied to the electronic field at present, wherein the application range of the thermal conductive gasket is widest. The traditional heat conducting pad is usually formed by compounding a filler with high heat conductivity and silica gel, the higher the proportion of the inorganic filler is, the better the heat conducting property of the composite material is, but when the proportion of the filler exceeds a critical value, the physical property and the mechanical property of the composite material are greatly reduced, and the use field of the composite material is seriously influenced. Carbon-based materials have demonstrated their potential as thermal interface materials in terms of their microscopic flexibility, high thermal conductivity, and high mechanical strength. Compared with the traditional ceramic-based heat-conducting filler, the graphitized carbon fiber has high heat conductivity>900 W/mK and low density 2.0 g/cm 3 The advantages of (1) and good mechanical properties, and the heat conduction orientation can be designed according to the direction of the fiber, so that the directional dredging of heat is realized, and the fiber is the most ideal filler for preparing thermal interface materials. The carbon fibers have ultrahigh thermal conductivity, and after the carbon fibers are directionally arranged in the silica gel matrix, the thermal conductivity of the composite material can be greatly improved by a small adding amount, so that the heat conducting gasket has high thermal conductivity in the axial direction of the carbon fibers.
However, in the preparation process, if the carbon fibers are completely positioned in the silica gel pad, the heat conductivity efficiency is greatly reduced, and the advantage of heat conduction of the carbon fibers cannot be exerted; when the end of the carbon fiber is exposed out of the surface of the heat conducting pad, although the heat conductivity of the material is greatly improved, the exposed carbon fiber on the surface can cause short circuit of electronic components, and further normal operation of electronic equipment is influenced.
Disclosure of Invention
In order to solve the above problems, it is an object of the present invention to prepare a surface insulation-coated carbon fiber by coating a surface of a carbon fiber with a layer of SiC or Si 3 N 4 The insulating layer improves the insulating property of the carbon fiber and avoids the adverse effect of the carbon fiber in the application of electronic elements.
In order to achieve the purpose, the invention adopts the following scheme:
a preparation method of insulating heat-conducting carbon fibers for a thermal interface material comprises the following steps:
(1) Preparation of SiO 2 Sol;
(2) Treatment of carbon fibers: soaking carbon fibers in the SiO prepared in the step (1) 2 Stirring uniformly in the sol to form a layer of uniform and stable insulating SiO on the surface of the carbon fiber substrate 2 Coating;
(3) High-temperature thermal reduction: siO prepared in the step (2) 2 And (4) carrying out high-temperature thermal reduction on the carbon fiber coated by the coating to obtain the insulated carbon fiber coated on the surface.
(4) Fiber surface modification: and (4) placing the insulated carbon fiber prepared in the step (3) in a solution of a silane coupling agent for chemical grafting to obtain the insulated carbon fiber with modified surface.
Preferably, the conditions of the high-temperature thermal reduction in the step (3) are as follows: and coating the surface of the SiC coating in an Ar atmosphere at 1200-1550 ℃.
Preferably, the conditions of the high-temperature thermal reduction in the step (3) are as follows: n is a radical of 2 Or NH 3 Atmosphere at 1300 to 1700 ℃, and surface coating of Si 3 N 4 And (4) coating.
Preferably, the process of step (1) is: uniformly mixing ethyl orthosilicate, ethanol and water, and then dropwise adding acid liquor until the pH value is 3~5; uniformly mixing, and hydrolyzing at 50-90 ℃ for 2-10 h at constant temperature to form sol; the used raw materials are as follows: 30-80g of carbon fiber, 50-100mL of ethyl orthosilicate, 100-500mL of ethanol and 100-500mL of water.
Preferably, the carbon fiber of the step (2) is a carbon fiber with an oxidized surface; the carbon fibers are high-thermal-conductivity carbon fibers and comprise pitch-based carbon fibers, vapor deposition carbon fibers and graphene-based carbon fibers.
Preferably, the silane coupling agent of step (4) is one or more of gamma-aminopropyltriethoxysilane, gamma- (2,3-glycidoxy) propyltrimethoxysilane, gamma-methacryloxypropyl, vinyltriethoxysilane, vinyltrimethoxysilane and hexadecyltrimethoxysilane; the diameter of the high-thermal-conductivity carbon fiber is 6-20 mu m, the length of the high-thermal-conductivity carbon fiber is 50-400 mu m, and the thermal conductivity of the high-thermal-conductivity carbon fiber is 400-1000W/mK.
Preferably, the preparation method of the modified carbon fiber comprises the following steps: mixing a silane coupling agent with an ethanol/water solution, uniformly stirring, adding carbon fibers to be modified, stirring at 50-100 ℃ for 1-5h, carrying out suction filtration, separation, washing and drying to prepare the carbon fibers with the modified surface by grafting; the mass ratio of the silane coupling agent to the modified carbon fiber is 0.1-3.0%.
The insulating heat-conducting carbon fiber prepared by the preparation method is applied to the heat-conducting gasket.
The application comprises the following steps:
(1) Uniformly stirring vinyl silicone oil, hydrogen-containing silicone oil and an inhibitor in vacuum to obtain a mixture A;
(2) Adding the spherical ceramic micro powder subjected to surface grafting modification into the mixed solution A obtained in the step (1), and uniformly stirring in vacuum to obtain a mixture B;
(3) Adding the carbon fiber with the insulated and coated surface into the mixed liquid B in the step (2), adding a catalyst, and uniformly stirring in vacuum to obtain a mixture C;
(4) Transferring the mixture C obtained in the step (3) into a mold, respectively connecting a positive electrode and a negative electrode on two sides, and applying an electric field; and then heating and curing to obtain the high heat conduction material.
Preferably, the weight parts of the used raw materials are as follows: 200-500 parts of insulating carbon fiber, 800-1500 parts of modified spherical ceramic micro powder, 100 parts of vinyl silicone oil, 5-10 parts of hydrogen-containing silicone oil, 4736 parts of catalyst 1~3 and 0.1-0.5 part of inhibitor, wherein the catalyst is preferably platinum complexing agent, and the inhibitor is preferably ethyne cyclohexanol.
The carbon fiber heat conduction material with good heat conduction performance, softness and good insulation performance is prepared by compounding the high-heat-conduction carbon fiber subjected to insulation treatment with the spherical ceramic micro powder and enabling the carbon fiber to be directionally arranged under the action of an electric field.
Drawings
Fig. 1 is an SEM image of an insulated thermally conductive carbon fiber for a thermal interface material.
Compared with the prior art, the invention has the advantages that:
1. simple process and easy operation
Preparation of SiO by sol-gel method 2 Sol, then dissolving carbon fiber and SiO 2 Mixed, siO 2 Can be easily and uniformly coated on the surface of the carbon fiber to form a coating. Under high temperature conditions, siO 2 Conversion to SiC or Si 3 N 4 Thereby evenly cladding on the surface of the carbon fiber and realizing the purpose of carbon fiber insulation. And simultaneously, uniformly mixing the carbon fibers coated with the insulation layer with the liquid silicone rubber, applying an electric field to realize the directional orientation of the carbon fibers, and preparing the high-thermal-conductivity and soft thermal interface material.
2. The coating effect of the insulating coating is good
Carbon fiber and SiO 2 Mixing of sols, analogous to mixing SiO 2 The carbon fiber is brushed on the surface of the carbon fiber, and a uniform and stable insulating coating is gradually formed on the surface of the carbon fiber through high-temperature gas-phase reaction to tightly coat the carbon fiber, so that the carbon fiber has an excellent insulating effect.
Detailed description of the preferred embodiments.
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
A method of making insulated carbon fibers comprising the steps of:
step 1: preparation of SiO 2 Dissolving sol, preparing mixed solution of 50mL of ethyl orthosilicate, 110mL of ethanol and 160mL of deionized water, continuously stirring to prepare mixed solution, and slowly addingSlowly dropwise adding 3mL of hydrochloric acid until the pH value is about 5, and hydrolyzing at 50 ℃ for 6h at constant temperature.
Step 2: adding 30g of oxidized carbon fiber to SiO in step 1 2 Stirring the sol for 3 hours to form a layer of uniform and stable SiO on the surface of the carbon fiber substrate 2 And (4) coating. Then separating, washing and drying.
And step 3: siO prepared in step 2 2 The coated carbon fibers are transferred to a high temperature condition. Performing heat preservation treatment for 4 hours at 1550 ℃ in Ar atmosphere to coat SiO on the surface 2 Converted to a SiC coating. Thus obtaining the SiC-coated insulating carbon fiber.
And 4, step 4: the fiber is surface modified. Preparing an ethanol/water solution of gamma-aminopropyltriethoxysilane with the mass fraction of 2%, wherein the ethanol water solution is prepared according to the volume ratio of ethanol to water = 10. Wherein, the silane coupling agent accounts for 3 percent of the weight of the filler.
Example 2
A method of making insulated carbon fibers comprising the steps of:
step 1: preparation of SiO 2 And (3) sol, preparing 70mL of mixed solution of ethyl orthosilicate, 150mL of ethanol and 200mL of deionized water, continuously stirring to prepare a mixed solution, then slowly dropwise adding 5mL of nitric acid until the pH value is about 4, and hydrolyzing at the constant temperature of 50 ℃ for 6 hours.
Step 2: adding 50g of oxidized carbon fiber to SiO in step 1 2 Stirring for 3h in the sol to form a layer of uniform and stable SiO on the surface of the carbon fiber substrate 2 And (4) coating. Then separating, washing and drying.
And step 3: siO prepared in step 2 2 The coated carbon fibers are transferred to a high temperature condition. Performing heat preservation treatment for 5 hours at 1200 ℃ in Ar atmosphere, and coating SiO on the surface 2 Converted to a SiC coating. Thus obtaining the SiC-coated insulating carbon fiber.
And 4, step 4: the fiber is surface modified. Preparing an ethanol/water solution of 1% by mass of vinyltriethoxysilane, wherein the ethanol water solution is prepared according to the volume ratio of ethanol to water = 10. Wherein, the silane coupling agent accounts for 0.5 percent of the weight of the filler.
Example 3
A method of making insulated carbon fibers comprising the steps of:
step 1: preparation of SiO 2 Dissolving the sol, preparing a mixed solution of 100mL of ethyl orthosilicate, 300mL of ethanol and 400mL of deionized water, continuously stirring to prepare a mixed solution, slowly dropwise adding 8mL of sulfuric acid until the pH value is about 3, and hydrolyzing at the constant temperature of 50 ℃ for 6 hours.
Step 2: adding 80g of oxidized carbon fiber to SiO in step 1 2 Stirring for 4 hours in the sol to form a layer of uniform and stable SiO on the surface of the carbon fiber substrate 2 And (4) coating. Then separating, washing and drying.
And step 3: siO prepared in step 2 2 The coated carbon fibers are transferred to a high temperature condition. N is a radical of hydrogen 2 Performing heat preservation treatment at 1700 ℃ for 3h to coat SiO on the surface 2 Conversion to Si 3 N 4 And (4) coating. Namely to obtain Si 3 N 4 Coated insulating carbon fibers.
And 4, step 4: the fiber is surface modified. Preparing an ethanol/water solution of 0.5% hexadecyl trimethoxy silane, wherein the ethanol water solution is prepared according to the volume ratio of ethanol to water = 10. Wherein, the silane coupling agent accounts for 0.1 percent of the weight of the filler.
Example 4
A method of making insulated carbon fibers comprising the steps of:
step 1: preparation of SiO 2 Dissolving sol, preparing 100mL of mixed solution of ethyl orthosilicate, 300mL of ethanol and 400mL of deionized water, continuously stirring to prepare mixed solution, then slowly dropwise adding 8mL of hydrochloric acid until the pH value reaches about 3, and dissolving the mixed solution in the presence of waterHydrolyzing at 50 ℃ for 6h.
And 2, step: adding 80g of oxidized carbon fiber to SiO in step 1 2 Stirring for 4h in the sol to form a layer of uniform and stable SiO on the surface of the carbon fiber substrate 2 And (4) coating. Then separating, washing and drying.
And 3, step 3: siO prepared in step 2 2 The coated carbon fibers are transferred to a high temperature condition. N is a radical of 2 /NH 3 Mixing the above materials, maintaining the temperature at 1300 deg.C for 6h, and coating SiO on the surface 2 Conversion to Si 3 N 4 And (4) coating. Namely to obtain Si 3 N 4 Coated insulating carbon fibers.
Step 1: the fiber is surface modified. Preparing an ethanol/water solution of 2% of vinyl trimethoxy silane by mass, wherein the ethanol water solution is prepared according to the volume ratio of ethanol to water = 10. Wherein, the silane coupling agent accounts for 1 percent of the weight of the filler.
Example 5
In this embodiment, on the basis of embodiment 1, carbon fibers with surface insulation treatment are mixed into liquid silicone rubber, and the carbon fibers are regularly arranged by orientation, so as to prepare a high thermal conductive and insulating thermal conductive gasket. The method specifically comprises the following steps:
preparation of carbon fiber/silicone rubber mixture: vinyl silicone oil, hydrogen-containing silicone oil and inhibitor are stirred and mixed evenly in vacuum. And then adding the modified alumina micropowder and the insulated carbon fiber into the silicone oil mixture in sequence, and stirring and mixing uniformly in vacuum. Then adding platinum catalyst and stirring uniformly. Wherein, the composite material comprises the following components: 100 parts of vinyl silicone oil, 5 parts of hydrogen-containing silicone oil, 0.3 part of ethyne cyclohexanol, 1200 parts of spherical alumina, 200 parts of carbon fiber and 2 parts of platinum complexing agent.
Orientation of carbon fibers: and (3) placing the uniformly stirred composite material slurry into a mold. And connecting positive and negative electrodes at two ends of the mold respectively to perform electric field orientation. The distance between the dies is 2mm, and the voltage is adjusted to be 500V.
Curing the composite material: the temperature was raised to 100 ℃ with the applied electric field maintained, and held for 1h to complete curing, producing a 2mm thick thermal gasket.
Example 6
In this embodiment, on the basis of embodiment 2, carbon fibers with surface insulation treatment are mixed into liquid silicone rubber, and the carbon fibers are regularly arranged by orientation, so as to prepare a high thermal conductive and insulating thermal conductive gasket. The method specifically comprises the following steps:
preparation of carbon fiber/silicone rubber mixture: vinyl silicone oil, hydrogen-containing silicone oil and inhibitor are stirred and mixed evenly in vacuum. And then adding the modified alumina micropowder and the insulated carbon fiber into the silicone oil mixture in sequence, and stirring and mixing uniformly in vacuum. Then adding platinum catalyst and stirring uniformly. Wherein, the composite material comprises the following components: 100 parts of vinyl silicone oil, 7 parts of hydrogen-containing silicone oil, 0.2 part of ethyne cyclohexanol, 1500 parts of spherical alumina, 100 parts of carbon fiber and 2.5 parts of platinum complexing agent.
Orientation of carbon fibers: and (3) placing the uniformly stirred composite material slurry into a mold. And connecting positive and negative electrodes at two ends of the mold respectively to perform electric field orientation. The distance between the dies is 2mm, and the voltage is adjusted to be 700V.
Curing the composite material: and under the condition of maintaining the electric field, raising the temperature to 100 ℃, and maintaining for 1h until the temperature is completely cured to obtain the heat-conducting gasket with the thickness of 2 mm.
Example 7
In this embodiment, on the basis of embodiment 3, carbon fibers with surface insulation treatment are mixed into liquid silicone rubber, and the carbon fibers are regularly arranged by orientation, so as to prepare a high thermal conductive and insulating thermal conductive gasket. The method specifically comprises the following steps:
preparation of carbon fiber/silicone rubber mixture: vinyl silicone oil, hydrogen-containing silicone oil and inhibitor are stirred and mixed evenly in vacuum. And then adding the modified alumina micropowder and the insulated carbon fiber into the silicone oil mixture in sequence, and stirring and mixing uniformly in vacuum. Then adding platinum catalyst and stirring uniformly. Wherein, the composite material comprises the following components: 100 parts of vinyl silicone oil, 10 parts of hydrogen-containing silicone oil, 0.5 part of ethyne cyclohexanol, 500 parts of spherical alumina, 400 parts of carbon fiber and 3 parts of platinum complexing agent.
Orientation of carbon fibers: and (3) placing the uniformly stirred composite material slurry into a mold. And connecting positive and negative electrodes at two ends of the mold respectively to perform electric field orientation. The distance between the dies is 2mm, and the voltage is adjusted to 1000V.
Curing the composite material: and under the condition of maintaining the electric field, raising the temperature to 120 ℃, and maintaining for 1h until the temperature is completely cured to obtain the heat-conducting gasket with the thickness of 2 mm.
Comparative example 1
And mixing the carbon fibers grafted only by the silane coupling agent into the liquid silicone rubber, and regularly arranging the carbon fibers by orientation to prepare the high-thermal-conductivity insulating heat-conducting gasket. The method specifically comprises the following steps:
preparation of carbon fiber/silicone rubber mixture: vinyl silicone oil, hydrogen-containing silicone oil and inhibitor are stirred and mixed evenly in vacuum. And then adding the modified alumina micropowder and the carbon fiber into the silicone oil mixture in sequence, and stirring and mixing uniformly in vacuum. Then adding platinum catalyst and stirring uniformly. Wherein the composite material comprises the following components: 100 parts of vinyl silicone oil, 5 parts of hydrogen-containing silicone oil, 0.3 part of ethyne cyclohexanol, 1500 parts of spherical alumina, 100 parts of carbon fiber and 2 parts of platinum complexing agent.
Orientation of carbon fibers: and (3) placing the uniformly stirred composite material slurry into a mold. An electric field is applied to perform electric field orientation. The distance between the dies is 2mm, and a 500V electric field is applied
Curing the composite material: under the condition of keeping the applied electric field, the temperature is raised to 100 ℃, and the temperature is kept for 1h until the heat conduction gasket is completely cured, so that the heat conduction gasket with the thickness of 2mm is prepared.
In order to verify the insulation effect of the carbon fibers, a heat conduction gasket of 2mm is prepared according to the four ways of example 4,5,6 and comparative example 1, and the insulation performance of the carbon fiber surface coated with the coating is represented by testing the breakdown voltage of the gasket. Meanwhile, the thermal conductivity of the sample is tested, and the specific data is shown in the following table 1.
Table 1: results of sample Performance testing
For the carbon fiber without the insulating coating, the prepared sample has a thermal conductivity of 25.8W/mK, which is not greatly changed from that of the sample coated with the carbon fiber by the insulating coating, but the breakdown voltage resistance value is 0, and the sample has conductivity obviously.
Claims (10)
1. A preparation method of insulating heat-conducting carbon fibers for a thermal interface material is characterized by comprising the following steps:
(1) Preparation of SiO 2 Sol;
(2) Treatment of carbon fibers: soaking carbon fibers in the SiO prepared in the step (1) 2 Stirring uniformly in the sol to form a layer of uniform and stable insulating SiO on the surface of the carbon fiber substrate 2 Coating;
(3) High-temperature thermal reduction: siO prepared in the step (2) 2 Carrying out high-temperature thermal reduction on the carbon fiber coated by the coating to obtain insulated carbon fiber coated on the surface;
(4) Fiber surface modification: and (4) placing the insulated carbon fiber prepared in the step (3) in a solution of a silane coupling agent for chemical grafting to obtain the insulated carbon fiber with modified surface.
2. The method for preparing the insulating and heat-conducting carbon fiber for thermal interface materials according to claim 1, wherein the conditions of the high-temperature thermal reduction in the step (3) are as follows: and coating the surface of the SiC coating in an Ar atmosphere at 1200-1550 ℃.
3. The method for preparing the insulating and heat-conducting carbon fiber for thermal interface materials according to claim 1, wherein the conditions of the high-temperature thermal reduction in the step (3) are as follows: n is a radical of hydrogen 2 Or NH 3 Atmosphere at 1300 to 1700 ℃ and Si for surface coating 3 N 4 And (4) coating.
4. The method for preparing the insulating and heat-conducting carbon fiber for thermal interface materials according to claim 1, wherein the step (1) comprises the following steps: uniformly mixing ethyl orthosilicate, ethanol and water, and then dropwise adding acid liquor until the pH value is 3~5; uniformly mixing, and hydrolyzing at 50-90 ℃ for 2-10 h at constant temperature to form sol; the used raw materials are as follows: 30-80g of carbon fiber, 50-100mL of ethyl orthosilicate, 100-500mL of ethanol and 100-500mL of water.
5. The method for preparing the insulating and heat-conducting carbon fiber for the thermal interface material according to claim 1, wherein the carbon fiber of the step (2) is a surface-oxidized carbon fiber; the carbon fibers are high-thermal-conductivity carbon fibers and comprise pitch-based carbon fibers, vapor deposition carbon fibers and graphene-based carbon fibers.
6. The method for preparing the carbon fiber for thermal interface material as claimed in claim 1, wherein the silane coupling agent of step (4) is one or more of γ -aminopropyltriethoxysilane, γ - (2,3-glycidoxy) propyltrimethoxysilane, γ -methacryloxypropyl, vinyltriethoxysilane, vinyltrimethoxysilane, and hexadecyltrimethoxysilane; the diameter of the high-heat-conductivity carbon fiber is 6-20 mu m, the length of the high-heat-conductivity carbon fiber is 50-400 mu m, and the heat conductivity of the high-heat-conductivity carbon fiber is 400-1000W/mK.
7. The method for preparing the insulating and heat-conducting carbon fiber for the thermal interface material according to claim 6, wherein the method for preparing the modified carbon fiber comprises the following steps: mixing a silane coupling agent with an ethanol/water solution, uniformly stirring, adding carbon fibers to be modified, stirring for 1-5 hours at 50-100 ℃, carrying out suction filtration and separation, washing and drying to prepare the carbon fibers with the surface grafted and modified; the mass ratio of the silane coupling agent to the modified carbon fiber is 0.1-3.0%.
8. The use of the insulated heat-conducting carbon fiber prepared by the preparation method of claim 1 in heat-conducting gaskets.
9. Use according to claim 8, characterized in that it comprises the following steps:
(1) Uniformly stirring vinyl silicone oil, hydrogen-containing silicone oil and an inhibitor in vacuum to obtain a mixture A;
(2) Adding the spherical ceramic micro powder subjected to surface grafting modification into the mixed solution A obtained in the step (1), and uniformly stirring in vacuum to obtain a mixture B;
(3) Adding the carbon fiber with the insulated and coated surface into the mixed liquid B in the step (2), adding a catalyst, and uniformly stirring in vacuum to obtain a mixture C;
(4) Transferring the mixture C obtained in the step (3) into a mold, respectively connecting a positive electrode and a negative electrode on two sides, and applying an electric field; and then heating and curing to obtain the high heat conduction material.
10. The application of the compound fertilizer as claimed in claim 9, wherein the raw materials used are in parts by weight: 200-500 parts of insulating carbon fiber, 800-1500 parts of modified spherical ceramic micro powder, 100 parts of vinyl silicone oil, 5-10 parts of hydrogen-containing silicone oil, 4736 parts of catalyst 1~3 and 0.1-0.5 part of inhibitor, wherein the catalyst is preferably platinum complexing agent, and the inhibitor is preferably ethyne cyclohexanol.
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