CN114106559A - Preparation method of high-thermal-conductivity high-insulation silicone rubber composite material - Google Patents
Preparation method of high-thermal-conductivity high-insulation silicone rubber composite material Download PDFInfo
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Abstract
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, and belongs to the technical field of thermal-conductivity insulation materials. By means of the polymerization driving force brought by the reaction of isocyanate and polyol in the polyurethane foaming process, the alumina is supported by polyurethane to form alumina/polyurethane composite foam, and then the three-dimensional alumina framework is obtained through high-temperature sintering. In the process of curing and forming the vacuum-assisted impregnated silicon rubber, the carbon nano tube is introduced, and a more compact and lower-thermal-resistance heat transfer passage is constructed by virtue of the multi-dimensional synergistic effect of 0-dimensional micron aluminum oxide and 1-dimensional carbon nano tube so as to improve the heat-conducting property of the composite material. In order to be widely applied to the field of electronics and electrical appliances, the introduced carbon nano tube is blocked by the three-dimensional continuous alumina network, so that an electron transmission channel is not formed while a heat conduction network is formed, and the silicon rubber composite material has excellent performances of high heat conduction and high insulation at the same time, so that the safe and stable operation of electronic 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-thermal-conductivity high-insulation silicone rubber composite material.
Background
Currently, with the rapid development of microelectronic integration technology and assembly technology, electronic devices are gradually developing towards miniaturization and integration, and therefore, the heat dissipation problem of electronic components is increasingly prominent. If the heat dissipation capability of the electronic component is insufficient, the operation stability and safety of the electronic component in a high-temperature environment are easily affected, and the service life is shortened. With the rapid development of the microelectronic industry, the contradiction between the heat dissipation problem and the miniaturization trend is more severe, and therefore, the development of a thermal interface material with excellent performance has become the key to reduce heat accumulation, stabilize and operate safely and prolong the service life of electronic components. Meanwhile, for most electronic device thermal management applications, the thermal interface material needs to have sufficiently high resistivity while exhibiting high thermal conductivity, which is very important to avoid hidden troubles such as short circuit.
Silicone rubber is widely used as a thermal interface material due to its easy processing, light weight, high electrical insulation, and excellent mechanical properties. However, the inherent thermal conductivity is low and is about 0.18-0.2W/(m.K) at room temperature, which greatly limits the application of the silicone rubber in the field of heat conduction. The addition of a thermally conductive filler to silicone rubber to construct an efficient heat transfer path has been considered as one of effective methods for increasing thermal conductivity. Alumina has been widely used in the field of heat conduction because of its excellent heat-conductive insulation and good economy.
The thermally conductive filler is typically added to the polymer matrix using conventional mechanical blending methods, and efficient heat transfer networks can only be built up in the matrix when the amount is above 50 wt%. However, such a high filler addition greatly deteriorates 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 conduction material with lower filler content is researched and developed, and has great technical value and market value.
Disclosure of Invention
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material. The three-dimensional hole structure of the polyurethane foam is used as a sacrificial template, so that the heat-conducting filler alumina can form a heat-conducting network under a low addition amount, and the heat-conducting property of the silicone rubber composite material is improved. Meanwhile, in the process of finally vacuum-assisted impregnation of the silicone rubber, a certain amount of carbon nanotubes are mixed into the silicone rubber in advance, and a more compact and low-thermal-resistance heat conduction transmission channel is successfully constructed by virtue of the multi-scale synergistic effect of 0-dimensional alumina and 1-dimensional carbon nanotubes, so that the heat conduction performance of the composite material is further improved, and the continuous alumina network blocks an electronic transmission network of the carbon nanotubes, so that the excellent insulating performance is considered.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, which comprises the following steps:
the method comprises the following steps: adding an alumina filler in a polyurethane foaming process to construct alumina/polyurethane composite foam by a polymerization driving force and a three-dimensional pore structure caused by the reaction of isocyanate and polyol in the ester foaming process, wherein the polyurethane foam raw materials comprise isocyanate, polyol, a foaming agent and a catalyst; the isocyanate is polyphenyl polymethylene polyisocyanate, the polyalcohol is polypropylene glycol, the foaming agent is deionized water, and the catalyst is triethylene diamine and dibutyltin dilaurate;
step two: sintering the composite foam constructed in the step one at a high temperature, removing the polyurethane template and sintering alumina to construct a three-dimensionally interconnected alumina framework;
step three: preparing a mixed solution of silicon rubber, a curing agent and carbon nanotubes;
step four: pouring the mixed solution prepared in the third step into the three-dimensional interconnected alumina framework prepared in the second step;
step five: putting the mixture into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing.
In the first step, the particle size of the alumina is 10-15 μm, and the purity is not lower than 99%.
In the first step, polyphenyl polymethylene polyisocyanate, polypropylene glycol, deionized water, triethylene diamine and dibutyltin dilaurate are used as raw materials of the alumina/polyurethane composite foam, the mass ratio of 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 12h, and fully drying;
(2) placing polypropylene glycol, polyphenyl polymethylene polyisocyanate and aluminum oxide into a mixing device according to the mass ratio of 40: 100: 20-60, mechanically stirring at the stirring speed of 500rpm, and mixing for 10 min;
(3) dropwise adding a certain amount of composite catalyst (the composite mass ratio is 1: 3) consisting of triethylene diamine and dibutyltin dilaurate in the mixing system in the previous step under the condition of continuously stirring (the stirring speed is 500rpm), adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding a certain amount of foaming agent (deionized water) into the mixed system in the previous step under the condition of continuously stirring (the stirring speed is 1000rpm), 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 finished, and mixing for 10 s;
(5) putting into a 50 ℃ oven, and curing for 12 h.
And in the second step of high-temperature sintering, the alumina/polyurethane composite foam is placed into a tubular furnace, the temperature is raised to 700 ℃ at the speed of 1 ℃/min, then the temperature is raised to 1500 ℃ at the speed of 2 ℃/min, and the temperature is kept for 1 h.
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 by mechanical stirring according to the mass ratio of 100: 2: 10-30 to prepare the carbon nano tube/silicon rubber mixed solution.
The vacuum degree in the fifth step is-30 to-100 kPa, and the vacuumizing time is 12 to 36 hours.
The curing conditions in the fifth step are as follows: the curing temperature is 150 ℃, and the curing time is 20 min.
According to the high-thermal-conductivity high-insulation silicone rubber composite material prepared by the preparation method, polyurethane foam is used as a sacrificial template, a three-dimensional thermal-conductivity framework based on micron aluminum oxide is formed in advance, carbon nano tubes are added in the process of vacuum-assisted impregnation of silicone rubber, a thermal-conductivity path is further increased by virtue of the multi-dimensional synergistic effect of 0-dimensional aluminum oxide and 1-dimensional carbon nano tubes, and the high-thermal-conductivity high-insulation silicone rubber composite material is finally obtained through curing.
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 three-dimensional filler framework is formed in advance, and the polymer is impregnated in a vacuum-assisted manner to prepare the heat-conducting composite material, so that compared with the traditional method of mechanically blending the heat-conducting filler and the polymer matrix, the problem that the heat-conducting filler is randomly distributed under a low filler amount and is difficult to form a heat-conducting network is solved.
(3) In the preparation process, the heat-conducting fillers with two sizes are used, the heat-conducting network is more compact by virtue of the multi-dimensional synergistic effect of the 0-dimensional alumina and the 1-dimensional carbon nano tube, and meanwhile, the electron transmission network of the carbon nano tube is blocked by the three-dimensional continuous alumina network, so that the high heat-conducting performance is ensured and the excellent insulating performance is also considered.
(4) The preparation method 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 illustrative only and are not intended to limit the scope of the invention, which is to be given numerous insubstantial modifications and adaptations by those skilled in the art based on the teachings set forth above.
Example 1
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, which comprises the following specific steps:
the method comprises the following steps: forming the alumina/polyurethane composite foam by the following specific steps:
(1) placing the alumina in an oven at 80 ℃ for 12h, and fully drying;
(2) respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 4g of alumina, placing the materials in a mixing device, stirring at the rotating speed of 500rpm, and mixing for 10min to obtain a mixed solution of a polyurethane prepolymer and the alumina;
(3) 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 into the mixed system under the condition of continuously stirring (the stirring speed is 500rpm), adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding 0.6g of foaming agent (deionized water) while continuously stirring the mixed system in the previous step (stirring speed is 1000rpm), adjusting the stirring speed to 1500rpm after the dropwise adding is finished, and mixing for 10 s;
(5) and putting the prepared alumina/polyurethane composite foam into a 50 ℃ oven, and curing for 12 h.
Step two: removing the template from the cured alumina/polyurethane composite foam by using a tubular furnace and sintering at high temperature, wherein the conditions are that the temperature is increased to 700 ℃ at the speed of 1 ℃/min, then the temperature is increased to 1500 ℃ at the speed of 2 ℃/min and the temperature is kept for 1 h;
step three: preparing a mixed solution of the silicon rubber, the curing agent and the carbon nano tube according to the mass ratio of 100: 2: 10;
step four: pouring the prepared carbon nano tube/silicon rubber mixed solution into the three-dimensional interconnected alumina framework prepared in the step two;
step five: putting into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing at 150 ℃ for 20 min.
Example 2
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, which comprises the following specific steps:
the method comprises the following steps: forming the alumina/polyurethane composite foam by the following specific steps:
(1) placing the alumina in an oven at 80 ℃ for 12h, and fully drying;
(2) respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 8g of alumina, placing the materials in a mixing device, stirring at the rotating speed of 500rpm, and mixing for 10min to obtain a mixed solution of a polyurethane prepolymer and the alumina;
(3) 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 into the mixed system under the condition of continuously stirring (the stirring speed is 500rpm), adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding 0.6g of foaming agent (deionized water) while continuously stirring the mixed system in the previous step (stirring speed is 1000rpm), adjusting the stirring speed to 1500rpm after the dropwise adding is finished, and mixing for 10 s;
(5) and putting the prepared alumina/polyurethane composite foam into a 50 ℃ oven, and curing for 12 h.
Step two: removing the template from the cured alumina/polyurethane composite foam by using a tubular furnace and sintering at high temperature, wherein the conditions are that the temperature is increased to 700 ℃ at the speed of 1 ℃/min, then the temperature is increased to 1500 ℃ at the speed of 2 ℃/min and the temperature is kept for 1 h;
step three: preparing a mixed solution of the silicon rubber, the curing agent and the carbon nano tube according to the mass ratio of 100: 2: 10;
step four: pouring the prepared carbon nano tube/silicon rubber mixed solution into the three-dimensional interconnected alumina framework prepared in the step two;
step five: putting into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing at 150 ℃ for 20 min.
Example 3
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, which comprises the following specific steps:
the method comprises the following steps: forming the alumina/polyurethane composite foam by the following specific steps:
(1) placing the alumina in an oven at 80 ℃ for 12h, and fully drying;
(2) respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 12g of alumina, placing the materials in a mixing device, stirring at the rotating speed of 500rpm, and mixing for 10min to obtain a mixed solution of a polyurethane prepolymer and the alumina;
(3) 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 into the mixed system under the condition of continuously stirring (the stirring speed is 500rpm), adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding 0.6g of foaming agent (deionized water) while continuously stirring the mixed system in the previous step (stirring speed is 1000rpm), adjusting the stirring speed to 1500rpm after the dropwise adding is finished, and mixing for 10 s;
(5) and putting the prepared alumina/polyurethane composite foam into a 50 ℃ oven, and curing for 12 h.
Step two: removing the template from the cured alumina/polyurethane composite foam by using a tubular furnace and sintering at high temperature, wherein the conditions are that the temperature is increased to 700 ℃ at the speed of 1 ℃/min, then the temperature is increased to 1500 ℃ at the speed of 2 ℃/min and the temperature is kept for 1 h;
step three: preparing a mixed solution of the silicon rubber, the curing agent and the carbon nano tube according to the mass ratio of 100: 2: 10;
step four: pouring the prepared carbon nano tube/silicon rubber mixed solution into the three-dimensional interconnected alumina framework prepared in the step two;
step five: putting into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing at 150 ℃ for 20 min.
Example 4
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, which comprises the following specific steps:
the method comprises the following steps: forming the alumina/polyurethane composite foam by the following specific steps:
(1) placing the alumina in an oven at 80 ℃ for 12h, and fully drying;
(2) respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 4g of alumina, placing the materials in a mixing device, stirring at the rotating speed of 500rpm, and mixing for 10min to obtain a mixed solution of a polyurethane prepolymer and the alumina;
(3) 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 into the mixed system under the condition of continuously stirring (the stirring speed is 500rpm), adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding 0.6g of foaming agent (deionized water) while continuously stirring the mixed system in the previous step (stirring speed is 1000rpm), adjusting the stirring speed to 1500rpm after the dropwise adding is finished, and mixing for 10 s;
(5) and putting the prepared alumina/polyurethane composite foam into a 50 ℃ oven, and curing for 12 h.
Step two: removing the template from the cured alumina/polyurethane composite foam by using a tubular furnace and sintering at high temperature, wherein the conditions are that the temperature is increased to 700 ℃ at the speed of 1 ℃/min, then the temperature is increased to 1500 ℃ at the speed of 2 ℃/min and the temperature is kept for 1 h;
step three: preparing a mixed solution of the silicon rubber, the curing agent and the carbon nano tube according to the mass ratio of 100: 2: 30;
step four: pouring the prepared carbon nano tube/silicon rubber mixed solution into the three-dimensional interconnected alumina framework prepared in the step two;
step five: putting into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing at 150 ℃ for 20 min.
Example 5
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, which comprises the following specific steps:
the method comprises the following steps: forming the alumina/polyurethane composite foam by the following specific steps:
(1) placing the alumina in an oven at 80 ℃ for 12h, and fully drying;
(2) respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 8g of alumina, placing the materials in a mixing device, stirring at the rotating speed of 500rpm, and mixing for 10min to obtain a mixed solution of a polyurethane prepolymer and the alumina;
(3) 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 into the mixed system under the condition of continuously stirring (the stirring speed is 500rpm), adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding 0.6g of foaming agent (deionized water) while continuously stirring the mixed system in the previous step (stirring speed is 1000rpm), adjusting the stirring speed to 1500rpm after the dropwise adding is finished, and mixing for 10 s;
(5) and putting the prepared alumina/polyurethane composite foam into a 50 ℃ oven, and curing for 12 h.
Step two: removing the template from the cured alumina/polyurethane composite foam by using a tubular furnace and sintering at high temperature, wherein the conditions are that the temperature is increased to 700 ℃ at the speed of 1 ℃/min, then the temperature is increased to 1500 ℃ at the speed of 2 ℃/min and the temperature is kept for 1 h;
step three: preparing a mixed solution of the silicon rubber, the curing agent and the carbon nano tube according to the mass ratio of 100: 2: 30;
step four: pouring the prepared carbon nano tube/silicon rubber mixed solution into the three-dimensional interconnected alumina framework prepared in the step two;
step five: putting into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing at 150 ℃ for 20 min.
Example 6
The invention provides a preparation method of a high-thermal-conductivity high-insulation silicone rubber composite material, which comprises the following specific steps:
the method comprises the following steps: forming the alumina/polyurethane composite foam by the following specific steps:
(1) placing the alumina in an oven at 80 ℃ for 12h, and fully drying;
(2) respectively weighing 8g of phenyl polymethylene polyisocyanate, 20g of polypropylene glycol and 12g of alumina, placing the materials in a mixing device, stirring at the rotating speed of 500rpm, and mixing for 10min to obtain a mixed solution of a polyurethane prepolymer and the alumina;
(3) 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 into the mixed system under the condition of continuously stirring (the stirring speed is 500rpm), adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding 0.6g of foaming agent (deionized water) while continuously stirring the mixed system in the previous step (stirring speed is 1000rpm), adjusting the stirring speed to 1500rpm after the dropwise adding is finished, and mixing for 10 s;
(5) and putting the prepared alumina/polyurethane composite foam into a 50 ℃ oven, and curing for 12 h.
Step two: removing the template from the cured alumina/polyurethane composite foam by using a tubular furnace and sintering at high temperature, wherein the conditions are that the temperature is increased to 700 ℃ at the speed of 1 ℃/min, then the temperature is increased to 1500 ℃ at the speed of 2 ℃/min and the temperature is kept for 1 h;
step three: preparing a mixed solution of the silicon rubber, the curing agent and the carbon nano tube according to the mass ratio of 100: 2: 30;
step four: pouring the prepared carbon nano tube/silicon rubber mixed solution into the three-dimensional interconnected alumina framework prepared in the step two;
step five: putting into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing at 150 ℃ for 20 min.
Effect verification
The silicone rubber-based composite materials prepared in examples 1 to 6 were tested for thermal and electrical conductivity, and the results are shown in table 1. The heat conductivity coefficient is measured by a TC3000E hot wire method heat conductivity tester, and each sample is tested five times according to GB/T10297 to obtain an average value. Testing of electrical conductivity the composite material was tested for volume resistivity using a digital high resistance meter model PC68, the test being performed according to the national standard GB/T15738-2008, and an average is taken over five tests per sample.
TABLE 1 results of performance testing of samples of each example
| Sample name | Heat conductivity (W/(m.K)) | Volume resistivity (omega. m) |
| Case 1 | 0.98 | 2.11×1015 |
| Case 2 | 1.53 | 3.20×1015 |
| Case 3 | 2.75 | 4.68×1015 |
| Case 4 | 1.30 | 9.32×1014 |
| Case 5 | 2.47 | 1.29×1015 |
| Case 6 | 4.47 | 2.22×1015 |
The invention has many applications, and the above description is only 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 various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (8)
1. The preparation method of the high-thermal-conductivity high-insulation silicone rubber composite material is characterized by comprising the following steps of:
the method comprises the following steps: adding an alumina filler in the polyurethane foaming process to construct alumina/polyurethane composite foam by a polymerization driving force and a three-dimensional pore structure thereof, which are caused by the reaction of isocyanate and polyol in the polyurethane foaming process; the polyurethane foam raw material comprises isocyanate, polyol, a foaming agent and a catalyst; the isocyanate is polyphenyl polymethylene polyisocyanate, the polyalcohol is polypropylene glycol, the foaming agent is deionized water, and the catalyst is triethylene diamine and dibutyltin dilaurate;
step two: sintering the composite foam constructed in the step one at a high temperature, removing the polyurethane template and sintering alumina to construct a three-dimensionally interconnected alumina framework;
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-butyl peroxy-hexane respectively;
step four: pouring the carbon nano tube/silicon rubber mixed solution prepared in the third step into the three-dimensional interconnected alumina framework prepared in the second step;
step five: putting the mixture into a vacuum oven, vacuumizing until no bubbles are generated, and finally heating and curing.
2. The preparation method of the high-thermal-conductivity high-insulation silicone rubber composite material according to claim 1, characterized by comprising the following steps: in the first step, the particle size of the alumina is 10-15 mu m, and the purity is not lower than 99%.
3. The method for preparing the high-thermal-conductivity high-insulation silicone rubber composite material according to claim 1, wherein in the first step, the raw materials of the alumina/polyurethane syntactic foam comprise polyphenyl polymethylene polyisocyanate, polypropylene glycol, deionized water, triethylene diamine, dibutyltin dilaurate and alumina in a mass ratio of 40: 100: 3: 0.5: 1.5: 20-60, and the step of preparing the alumina/polyurethane syntactic foam comprises:
(1) placing the alumina in an oven at 80 ℃ for 12h, and fully drying;
(2) placing polypropylene glycol, polyphenyl polymethylene polyisocyanate and aluminum oxide into a mixing device according to the mass ratio of 40: 100: 20-60, mechanically stirring at the stirring speed of 500rpm for 10 min;
(3) dropwise adding a certain amount of composite catalyst (the composite mass ratio is 1: 3) consisting of triethylene diamine and dibutyltin dilaurate under the condition of continuously stirring the mixing system in the last step, adjusting the stirring speed to 1000rpm after the dropwise adding is finished, and mixing for 1 min;
(4) dropwise adding a certain amount of foaming agent deionized water under the condition of continuously stirring the mixing system in the last step, 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 finished, and mixing for 10 s;
(5) putting into a 50 ℃ oven, and curing for 12 h.
4. The preparation method of the high-thermal-conductivity high-insulation silicone rubber composite material according to claim 1, characterized by comprising the following steps: and step two, the high-temperature sintering is to put the alumina/polyurethane composite foam into a tubular furnace, heat up to 700 ℃ at the speed of 1 ℃/min, heat up to 1500 ℃ at the speed of 2 ℃/min and keep the temperature for 1 h.
5. The preparation method of the high-thermal-conductivity high-insulation silicone rubber composite material according to claim 1, characterized by comprising the following steps: and step three, 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 by mechanical stirring according to the mass ratio of 100: 2: 10-30 to prepare a carbon nano tube/silicon rubber mixed solution.
6. The preparation method of the high-thermal-conductivity high-insulation silicone rubber composite material according to claim 1, characterized by comprising the following steps: the vacuum degree in the fifth step is-30 to-100 kPa, and the vacuumizing time is 12 to 36 hours.
7. The preparation method of the high-thermal-conductivity high-insulation silicone rubber composite material according to claim 1, characterized by comprising the following steps: the curing conditions in the fifth step are as follows: the curing temperature is 150 ℃, and the curing time is 20 min.
8. The high thermal conductivity and high insulation silicone rubber composite material prepared according to the method of any one of claims 1 to 7.
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