CN114106559B - Preparation method of high-heat-conductivity high-insulation silicon rubber composite material - Google Patents
Preparation method of high-heat-conductivity high-insulation silicon rubber composite material Download PDFInfo
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Abstract
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, and belongs to the technical field of heat-conductivity insulating materials. The alumina is supported by polyurethane to form alumina/polyurethane composite foam by virtue of polymerization driving force brought by the reaction of isocyanate and polyol in the polyurethane foaming process, and then the three-dimensional alumina skeleton is obtained by high-temperature sintering. In the process of vacuum-assisted curing and molding of impregnated silicon rubber, carbon nanotubes are introduced, and a denser and lower-thermal-resistance heat transfer passage is constructed by virtue of the multi-dimension synergistic effect of 0-dimension micrometer alumina and 1-dimension carbon nanotubes, so that the heat conducting performance of the composite material is improved. In order to be widely applied to the fields of electronics and electrical appliances, the introduced carbon nanotubes are blocked by a three-dimensional continuous aluminum oxide network, so that the heat conduction network is formed and an electronic transmission path is not formed, and the silicon rubber composite material has the excellent performances of high heat conduction and high insulation at the same time, so that the safe and stable operation of electronics and electrical equipment is ensured.
Description
Technical Field
The invention belongs to the field of polymer composite materials, and particularly relates to a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material.
Background
Currently, with the rapid development of microelectronic integration technology and assembly technology, electronic devices are gradually developed toward miniaturization and integration, and thus, the heat dissipation problem of electronic devices is increasingly prominent. If the heat dissipation capability of the electronic components is insufficient, the operation stability and the safety of the electronic components in a high-temperature environment are easily affected, and the service life is shortened. With the rapid development of the microelectronics industry, the contradiction between the heat dissipation problem and the miniaturization trend is more severe, so that the development of a thermal interface material with excellent performance has become a key for reducing heat accumulation, stabilizing and safe operation and prolonging the service life of electronic components. At the same time, for most thermal management applications of electronic devices, the thermal interface material exhibits high thermal conductivity while also requiring sufficiently high resistivity, which is of great importance in avoiding hidden hazards such as shorts.
Silicone rubber is widely used as a thermal interface material due to its ease of processing, light weight, high electrical insulation, and excellent mechanical properties. However, the inherent thermal conductivity is low, about 0.18-0.2W/(mK) at room temperature, which greatly limits the application of silicone rubber in the field of heat conduction. The addition of thermally conductive fillers to silicone rubber to build efficient heat transfer paths has generally been considered as one of the effective methods of improving thermal conductivity. Alumina has been widely used in the field of heat conduction because of its excellent heat conduction and insulation properties and good economical efficiency.
The thermally conductive filler is typically added to the polymer matrix using conventional mechanical blending methods, and an efficient heat transfer network is built up within the matrix only when the addition is above 50 wt%. However, the high filler addition greatly worsens the mechanical properties of the composite material and also adds difficulty to the production cost and processing technology of the composite material. Therefore, the high-heat-conductivity high-insulation silicon rubber-based heat-conducting material with lower filler content is researched and developed, and the high-heat-conductivity high-insulation silicon rubber-based heat-conducting material has great technical value and market value.
Disclosure of Invention
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material. The three-dimensional hole structure of the polyurethane foam is used as a sacrificial template, so that the heat conducting filler aluminum oxide can form a heat conducting network under the condition of low addition amount, and the heat conducting performance of the silicon rubber composite material is improved. Meanwhile, in the final vacuum auxiliary impregnation process of the silicon rubber, a certain amount of carbon nano tubes are mixed in the silicon rubber in advance, and a more compact and low-thermal-resistance heat conduction transmission channel is successfully constructed by means of the multi-scale synergistic effect of the 0-dimensional aluminum oxide and the 1-dimensional carbon nano tubes, so that the heat conduction performance of the composite material is further improved, and the continuous aluminum oxide network blocks the electron transmission network of the carbon nano tubes, so that the excellent insulating performance is considered.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, which comprises the following steps:
step one: through polymerization driving force and three-dimensional hole structure brought by the reaction of isocyanate and polyol in the process of foaming the ester, adding alumina filler in the process of foaming polyurethane to construct alumina/polyurethane composite foam, wherein the polyurethane foam raw materials comprise isocyanate, polyol, foaming agent and catalyst; the isocyanate is polyphenyl polymethylene polyisocyanate, the polyol is polypropylene glycol, the foaming agent is deionized water, and the catalyst is triethylene diamine and dibutyl tin dilaurate;
step two: the composite foam constructed in the step one is sintered at high temperature, a polyurethane template is removed, alumina is sintered, and a three-dimensional interconnected alumina skeleton is constructed;
step three: preparing a mixed solution of silicon rubber, a curing agent and carbon nanotubes;
step four: pouring the mixed solution prepared in the step three into the three-dimensional interconnected alumina skeleton prepared in the step two;
step five: placing the mixture into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and solidifying the mixture.
In the first step, the particle size of the alumina is 10-15 mu m, and the purity is not lower than 99%.
In the first step, the raw materials of the alumina/polyurethane composite foam comprise polyphenyl polymethylene polyisocyanate, polypropylene glycol, deionized water, triethylene diamine and dibutyl tin dilaurate, wherein the mass ratio of the alumina is 40:100:3:0.5:1.5:20-60, and the preparation steps of the alumina/polyurethane composite foam comprise:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Firstly, placing polypropylene glycol, polyphenyl polymethylene polyisocyanate and alumina into a mixing device according to the mass ratio of 40:100:20-60, mechanically stirring at 500rpm, and mixing for 10min;
(3) Continuously stirring in the mixed system in the last step (stirring rotation speed is 500 rpm), dropwise adding a certain amount of composite catalyst (the composite mass ratio is 1:3) consisting of triethylene diamine and dibutyl tin dilaurate, adjusting the stirring rotation speed to 1000rpm after the dropwise adding is completed, and mixing for 1min;
(4) Continuously stirring in the mixed system in the last step (stirring speed is 1000 rpm), dropwise adding a certain amount of foaming agent (deionized water), wherein the mass ratio of the deionized water to the polypropylene glycol is 100:3, adjusting the stirring speed to 1500rpm after the dropwise adding is completed, and mixing for 10s;
(5) Placing in a 50 ℃ oven, and curing for 12 hours.
In the second step, the high-temperature sintering is to put the aluminum oxide/polyurethane composite foam into a tube furnace, heat the aluminum oxide/polyurethane composite foam to 700 ℃ at the speed of 1 ℃/min, heat the aluminum oxide/polyurethane composite foam to 1500 ℃ at the speed of 2 ℃/min, and keep the temperature for 1h.
In the third step, the silicon rubber and the curing agent are methyl vinyl silicon rubber and 2, 5-dimethyl-2, 5-di (tert-butyl peroxy) hexane, the carbon nano tube is 10-15nm, the purity is not lower than 99%, and the silicon rubber, the curing agent and the carbon nano tube are fully mixed according to the mass ratio of 100:2:10-30 by using mechanical stirring, so as to prepare the mixed solution of the carbon nano tube/the silicon rubber.
And step five, the vacuum degree is-30 to-100 kPa, and the vacuumizing time is 12 to 36 hours.
The curing conditions in the fifth step are as follows: curing temperature is 150 ℃ and curing time is 20min.
The high-heat-conductivity high-insulation silicon rubber composite material prepared by the preparation method is characterized in that a three-dimensional heat-conductivity skeleton based on micrometer aluminum oxide is formed in advance by taking polyurethane foam as a sacrificial template, carbon nano tubes are added in the process of vacuum-assisted dipping silicon rubber, a heat conduction path is further increased by virtue of the multi-dimension synergistic effect of 0-dimension aluminum oxide and 1-dimension carbon nano tubes, and finally the high-heat-conductivity high-insulation silicon rubber composite material is obtained by solidification.
The invention has the beneficial effects that:
(1) In the preparation method, the selected alumina has excellent thermal conductivity and good insulating property, so that the method has great potential application value in the field of electronic equipment.
(2) In the preparation process, the heat-conducting composite material is prepared by adopting the preformed three-dimensional filler framework and then impregnating the polymer through vacuum assistance, and compared with the traditional method of mechanically blending the heat-conducting filler with the polymer matrix, the method has the advantage that the problem that the heat-conducting filler is difficult to form a heat-conducting network due to random distribution under the condition of lower filler amount is avoided.
(3) In the preparation process, the heat conducting filler with two sizes is used, the heat conducting network is more compact by means of the multi-size synergistic effect of the 0-dimensional alumina and the 1-dimensional carbon nano tube, and meanwhile, the three-dimensional continuous alumina network blocks the electron transmission network of the carbon nano tube, so that the high heat conducting property is ensured, and meanwhile, the excellent insulating property is also realized.
(4) The preparation method of the invention is simple, low in production cost and good in universality.
Detailed Description
The invention is further illustrated by the following specific examples. It is to be understood that the following examples are intended to illustrate the present invention and are not to be construed as limiting the scope of the invention, and that numerous insubstantial modifications and adaptations can be made by those skilled in the art in light of the foregoing disclosure.
Example 1
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, which comprises the following specific steps:
step one: the method for forming the aluminum oxide/polyurethane composite foam comprises the following specific steps:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 4g of alumina, placing into a mixing device, stirring at 500rpm, and mixing for 10min to obtain a mixed solution of polyurethane prepolymer and alumina;
(3) Continuously stirring the mixed system (stirring rotation speed is 500 rpm), dropwise adding 0.4g of a certain amount of composite catalyst (the composite mass ratio is 1:3) consisting of triethylene diamine and dibutyltin dilaurate, adjusting the stirring rotation speed to 1000rpm after the dropwise adding is completed, and mixing for 1min;
(4) Continuously stirring the mixed system in the last step (stirring rotation speed is 1000 rpm), dropwise adding 0.6g of foaming agent (deionized water), adjusting the stirring rotation speed to 1500rpm after the dropwise adding is finished, and mixing for 10s;
(5) The prepared alumina/polyurethane composite foam is put into a 50 ℃ oven for curing for 12 hours.
Step two: removing the template and sintering the cured aluminum oxide/polyurethane composite foam at a high temperature by using a tube furnace under the conditions of heating to 700 ℃ at a rate of 1 ℃/min, heating to 1500 ℃ at a rate of 2 ℃/min, and preserving heat for 1h;
step three: preparing a mixed solution of silicon rubber, a curing agent and carbon nanotubes according to the mass ratio of 100:2:10;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the previous step into the three-dimensional interconnected alumina skeleton prepared in the second step;
step five: placing into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and curing at 150 ℃ for 20min.
Example 2
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, which comprises the following specific steps:
step one: the method for forming the aluminum oxide/polyurethane composite foam comprises the following specific steps:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 8g of alumina, placing into a mixing device, stirring at 500rpm, and mixing for 10min to obtain a mixed solution of polyurethane prepolymer and alumina;
(3) Continuously stirring the mixed system (stirring rotation speed is 500 rpm), dropwise adding 0.4g of a certain amount of composite catalyst (the composite mass ratio is 1:3) consisting of triethylene diamine and dibutyltin dilaurate, adjusting the stirring rotation speed to 1000rpm after the dropwise adding is completed, and mixing for 1min;
(4) Continuously stirring the mixed system in the last step (stirring rotation speed is 1000 rpm), dropwise adding 0.6g of foaming agent (deionized water), adjusting the stirring rotation speed to 1500rpm after the dropwise adding is finished, and mixing for 10s;
(5) The prepared alumina/polyurethane composite foam is put into a 50 ℃ oven for curing for 12 hours.
Step two: removing the template and sintering the cured aluminum oxide/polyurethane composite foam at a high temperature by using a tube furnace under the conditions of heating to 700 ℃ at a rate of 1 ℃/min, heating to 1500 ℃ at a rate of 2 ℃/min, and preserving heat for 1h;
step three: preparing a mixed solution of silicon rubber, a curing agent and carbon nanotubes according to the mass ratio of 100:2:10;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the previous step into the three-dimensional interconnected alumina skeleton prepared in the second step;
step five: placing into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and curing at 150 ℃ for 20min.
Example 3
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, which comprises the following specific steps:
step one: the method for forming the aluminum oxide/polyurethane composite foam comprises the following specific steps:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 12g of alumina, placing into a mixing device, stirring at 500rpm, and mixing for 10min to obtain a mixed solution of polyurethane prepolymer and alumina;
(3) Continuously stirring the mixed system (stirring rotation speed is 500 rpm), dropwise adding 0.4g of a certain amount of composite catalyst (the composite mass ratio is 1:3) consisting of triethylene diamine and dibutyltin dilaurate, adjusting the stirring rotation speed to 1000rpm after the dropwise adding is completed, and mixing for 1min;
(4) Continuously stirring the mixed system in the last step (stirring rotation speed is 1000 rpm), dropwise adding 0.6g of foaming agent (deionized water), adjusting the stirring rotation speed to 1500rpm after the dropwise adding is finished, and mixing for 10s;
(5) The prepared alumina/polyurethane composite foam is put into a 50 ℃ oven for curing for 12 hours.
Step two: removing the template and sintering the cured aluminum oxide/polyurethane composite foam at a high temperature by using a tube furnace under the conditions of heating to 700 ℃ at a rate of 1 ℃/min, heating to 1500 ℃ at a rate of 2 ℃/min, and preserving heat for 1h;
step three: preparing a mixed solution of silicon rubber, a curing agent and carbon nanotubes according to the mass ratio of 100:2:10;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the previous step into the three-dimensional interconnected alumina skeleton prepared in the second step;
step five: placing into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and curing at 150 ℃ for 20min.
Example 4
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, which comprises the following specific steps:
step one: the method for forming the aluminum oxide/polyurethane composite foam comprises the following specific steps:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 4g of alumina, placing into a mixing device, stirring at 500rpm, and mixing for 10min to obtain a mixed solution of polyurethane prepolymer and alumina;
(3) Continuously stirring the mixed system (stirring rotation speed is 500 rpm), dropwise adding 0.4g of a certain amount of composite catalyst (the composite mass ratio is 1:3) consisting of triethylene diamine and dibutyltin dilaurate, adjusting the stirring rotation speed to 1000rpm after the dropwise adding is completed, and mixing for 1min;
(4) Continuously stirring the mixed system in the last step (stirring rotation speed is 1000 rpm), dropwise adding 0.6g of foaming agent (deionized water), adjusting the stirring rotation speed to 1500rpm after the dropwise adding is finished, and mixing for 10s;
(5) The prepared alumina/polyurethane composite foam is put into a 50 ℃ oven for curing for 12 hours.
Step two: removing the template and sintering the cured aluminum oxide/polyurethane composite foam at a high temperature by using a tube furnace under the conditions of heating to 700 ℃ at a rate of 1 ℃/min, heating to 1500 ℃ at a rate of 2 ℃/min, and preserving heat for 1h;
step three: the silicon rubber, the curing agent and the carbon nano tube are prepared into a mixed solution according to the mass ratio of 100:2:30;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the previous step into the three-dimensional interconnected alumina skeleton prepared in the second step;
step five: placing into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and curing at 150 ℃ for 20min.
Example 5
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, which comprises the following specific steps:
step one: the method for forming the aluminum oxide/polyurethane composite foam comprises the following specific steps:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 8g of alumina, placing into a mixing device, stirring at 500rpm, and mixing for 10min to obtain a mixed solution of polyurethane prepolymer and alumina;
(3) Continuously stirring the mixed system (stirring rotation speed is 500 rpm), dropwise adding 0.4g of a certain amount of composite catalyst (the composite mass ratio is 1:3) consisting of triethylene diamine and dibutyltin dilaurate, adjusting the stirring rotation speed to 1000rpm after the dropwise adding is completed, and mixing for 1min;
(4) Continuously stirring the mixed system in the last step (stirring rotation speed is 1000 rpm), dropwise adding 0.6g of foaming agent (deionized water), adjusting the stirring rotation speed to 1500rpm after the dropwise adding is finished, and mixing for 10s;
(5) The prepared alumina/polyurethane composite foam is put into a 50 ℃ oven for curing for 12 hours.
Step two: removing the template and sintering the cured aluminum oxide/polyurethane composite foam at a high temperature by using a tube furnace under the conditions of heating to 700 ℃ at a rate of 1 ℃/min, heating to 1500 ℃ at a rate of 2 ℃/min, and preserving heat for 1h;
step three: the silicon rubber, the curing agent and the carbon nano tube are prepared into a mixed solution according to the mass ratio of 100:2:30;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the previous step into the three-dimensional interconnected alumina skeleton prepared in the second step;
step five: placing into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and curing at 150 ℃ for 20min.
Example 6
The invention provides a preparation method of a high-heat-conductivity high-insulation silicon rubber composite material, which comprises the following specific steps:
step one: the method for forming the aluminum oxide/polyurethane composite foam comprises the following specific steps:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 12g of alumina, placing into a mixing device, stirring at 500rpm, and mixing for 10min to obtain a mixed solution of polyurethane prepolymer and alumina;
(3) Continuously stirring the mixed system (stirring rotation speed is 500 rpm), dropwise adding 0.4g of a certain amount of composite catalyst (the composite mass ratio is 1:3) consisting of triethylene diamine and dibutyltin dilaurate, adjusting the stirring rotation speed to 1000rpm after the dropwise adding is completed, and mixing for 1min;
(4) Continuously stirring the mixed system in the last step (stirring rotation speed is 1000 rpm), dropwise adding 0.6g of foaming agent (deionized water), adjusting the stirring rotation speed to 1500rpm after the dropwise adding is finished, and mixing for 10s;
(5) The prepared alumina/polyurethane composite foam is put into a 50 ℃ oven for curing for 12 hours.
Step two: removing the template and sintering the cured aluminum oxide/polyurethane composite foam at a high temperature by using a tube furnace under the conditions of heating to 700 ℃ at a rate of 1 ℃/min, heating to 1500 ℃ at a rate of 2 ℃/min, and preserving heat for 1h;
step three: the silicon rubber, the curing agent and the carbon nano tube are prepared into a mixed solution according to the mass ratio of 100:2:30;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the previous step into the three-dimensional interconnected alumina skeleton prepared in the second step;
step five: placing into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and curing at 150 ℃ for 20min.
Effect verification
The silicone rubber-based composites prepared in examples 1 to 6 were tested for heat and electrical conductivity, and the results are shown in table 1. The heat conductivity coefficient is measured by a TC3000E hot wire heat conduction tester, and each sample is measured five times and averaged by referring to GB/T10297. The test of the conductivity adopts a PC68 type digital high resistance meter to test the volume resistivity of the composite material, and the test executes the national standard GB/T15738-2008, and each sample is tested for five times and averaged.
Table 1 results of sample performance testing for various examples
| Sample name | Thermal conductivity (W/(m.K)) | Volume resistivity (Ω. M) |
| Case 1 | 0.98 | 2.11×10 15 |
| Case 2 | 1.53 | 3.20×10 15 |
| Case 3 | 2.75 | 4.68×10 15 |
| Case 4 | 1.30 | 9.32×10 14 |
| Case 5 | 2.47 | 1.29×10 15 |
| Case 6 | 4.47 | 2.22×10 15 |
There are many ways in which the invention may be practiced, and what has been described above is merely a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that modifications may be made without departing from the principles of the invention, and such modifications are intended to be within the scope of the invention.
Claims (7)
1. The preparation method of the high-heat-conductivity high-insulation silicon rubber composite material is characterized by comprising the following steps of:
step one: through polymerization driving force and three-dimensional hole structure brought by the reaction of isocyanate and polyol in the polyurethane foaming process, alumina filler is added in the polyurethane foaming process to construct alumina/polyurethane composite foam; the polyurethane foam raw material comprises isocyanate, polyol, foaming agent and catalyst; the isocyanate is polyphenyl polymethylene polyisocyanate, the polyol is polypropylene glycol, the foaming agent is deionized water, and the catalyst is triethylene diamine and dibutyl tin dilaurate;
step two: the composite foam constructed in the step one is sintered at high temperature, a polyurethane template is removed, alumina is sintered, and a three-dimensional interconnected alumina skeleton is constructed;
step three: preparing a mixed solution of silicon rubber, a curing agent and carbon nanotubes; the silicone rubber and the curing agent are methyl vinyl silicone rubber and 2, 5-dimethyl-2, 5- (di-tert-butylperoxy) -hexane respectively;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the step three into the three-dimensional interconnected alumina skeleton prepared in the step two;
step five: placing the mixture into a vacuum oven for vacuumizing until no bubble is generated, and finally heating and solidifying;
in the first step, the raw materials of the alumina/polyurethane composite foam comprise polyphenyl polymethylene polyisocyanate, polypropylene glycol, deionized water, triethylene diamine, dibutyl tin dilaurate and alumina in a mass ratio of 40:100:3:0.5:1.5 (20-60), and the preparation steps of the alumina/polyurethane composite foam comprise:
(1) Placing the alumina in an oven at 80 ℃ for 12 hours, and fully drying;
(2) Firstly, placing polypropylene glycol, polyphenyl polymethylene polyisocyanate and alumina into a mixing device according to the mass ratio, mechanically stirring at 500rpm, and mixing for 10min;
(3) Dropwise adding the composite catalyst consisting of triethylene diamine and dibutyl tin dilaurate in the mass ratio under the condition that the mixing system in the last step is continuously stirred, adjusting the stirring rotating speed to 1000rpm after the dropwise adding is finished, and mixing for 1min;
(4) Dropwise adding the foaming agent deionized water with the mass ratio under the condition that the mixing system in the last step is continuously stirred, and after the dropwise adding is finished, adjusting the stirring rotating speed to 1500rpm and mixing for 10s;
(5) Placing in a 50 ℃ oven, and curing for 12 hours.
2. The method for preparing the high-heat-conductivity high-insulation silicon rubber composite material according to claim 1, which is characterized in that: the grain diameter of the alumina in the step one is 10-15 mu m, and the purity is not less than 99%.
3. The method for preparing the high-heat-conductivity high-insulation silicon rubber composite material according to claim 1, which is characterized in that: and in the second step, the high-temperature sintering is to put the aluminum oxide/polyurethane composite foam into a tube furnace, heat the aluminum oxide/polyurethane composite foam to 700 ℃ at the speed of 1 ℃/min, heat the aluminum oxide/polyurethane composite foam to 1500 ℃ at the speed of 2 ℃/min, and keep the temperature for 1h.
4. The method for preparing the high-heat-conductivity high-insulation silicon rubber composite material according to claim 1, which is characterized in that: in the third step, the carbon nano tube is 10-15nm, and the purity is not lower than 99%.
5. The method for preparing the high-heat-conductivity high-insulation silicon rubber composite material according to claim 1, which is characterized in that: the vacuum degree in the step five is minus 30 to minus 100kPa, and the vacuumizing time is 12 to 36 hours.
6. The method for preparing the high-heat-conductivity high-insulation silicon rubber composite material according to claim 1, which is characterized in that: the curing conditions in the fifth step are as follows: curing temperature is 150 ℃ and curing time is 20min.
7. The high-heat-conductivity high-insulation silicone rubber composite material prepared by the method according to any one of claims 1-6.
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