CN114605836A - High-performance silicon oil-based flexible heat-conducting gasket and preparation method thereof - Google Patents
High-performance silicon oil-based flexible heat-conducting gasket and preparation method thereof Download PDFInfo
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Abstract
本发明公开了一种高性能硅油基柔性导热垫片及其制备方法，导热垫片由改性复合填料、端乙烯基硅油、含氢硅油、抑制剂、铂催化剂搅拌后所得具有流动性的浆料经抽真空处理于60～80℃加热成型所得；所述的改性复合填料由鳞片石墨、银粉与硅烷偶联剂加入无水乙醇中超声处理后加热搅拌并干燥所得。本发明导热垫片达到优异的导热性能的同时，具有制备方法简单、高柔软性、低渗油率以及可重复使用的特点，其作为热界面材料置于热源与散热器两固体材料接触面间，能够实现快速散热，从而提高电子产品的使用寿命。The invention discloses a high-performance silicone oil-based flexible thermal conductive gasket and a preparation method thereof. The material is vacuumed and heated at 60-80° C. to form; the modified composite filler is obtained by adding flake graphite, silver powder and silane coupling agent to absolute ethanol for ultrasonic treatment, heating, stirring and drying. While achieving excellent thermal conductivity, the thermal conductive gasket of the invention has the characteristics of simple preparation method, high flexibility, low oil leakage rate and reusability, and is used as a thermal interface material to be placed between the contact surfaces of the heat source and the two solid materials of the radiator. , can achieve rapid heat dissipation, thereby improving the service life of electronic products.
Description
Technical Field
The invention relates to a heat-conducting gasket, in particular to a high-performance flexible silicone oil-based heat-conducting gasket and a preparation method thereof, and belongs to the field of thermal interface materials.
Background
With the continuous development of communication technology, the electronic industry is more and more prone to development of light weight, thinness, high integration and miniaturization, and particularly, with the arrival of the 5G era, high-density integrated chips have wide application prospects in high and new technical fields such as intelligent electronic devices, household appliances, the automobile industry, aerospace and the like. The computing power of the 5G chip is about 5 times higher than that of the existing 4G chip, and the power consumption is about 2.5 times higher. When the chip is in operation, it will not convert 100% of the input current into an output signal, and some other part will be in the form of heat. If the heat can not be removed in time, the problems of heat accumulation, temperature rise, material aging, stress deformation, service life reduction or device malfunction and the like of the electronic device are easily caused. According to statistics, the performance of the electronic device is reduced by 10% when the temperature of the electronic device is increased by 2 ℃, the performance of the electronic device is increased by 10-20% per liter, and the failure rate is doubled. When the temperature of the electronic device is reduced by 10 ℃ by a heat dissipation means, the service life of the whole machine can be doubled, and the heat dissipation technology is becoming a key limiting factor for the development of electronic components.
The thermal interface material is an important material for heat dissipation of electronic components, and is mainly used for connecting a heat conducting element and a heat dissipation element. Because microscopic ravines and pores exist on the surfaces of the electronic device and the heat sink, the thermal interface material is filled in the micro-pores, so that a heat transfer channel between the electronic device and the heat sink plate or the heat sink can be constructed, and heat dissipation is promoted. Thus, the performance of the thermal management material directly affects the heat dissipation effect. However, most of the existing thermal interface materials in China have the defects of low thermal conductivity, high interface thermal resistance, poor insulation and the like, and cannot meet the heat dissipation requirement of 5G communication.
The heat conducting gasket is one kind of thermal interface material, that is, high heat conducting particle is added into polymer matrix, and solid and repeatable particle filled polymer is obtained through high crosslinking of the polymer matrix. Not only can greatly improve the heat-conducting property, but also can keep the wettability and the viscosity of the polymer, and has wide application in industry. In the prior art, generally, in order to take account of heat-conducting property and flexibility, a silicon-containing heat-conducting fin is generally adopted, but most of non-silicon-containing materials adopt rubber materials, so that the temperature-resistant requirement of a heat-conducting gasket is difficult to meet really. However, the silicone oil in the silicon-containing heat conduction gradually bleeds out due to continuous pressure, and contaminates the nearby electronic components, and dust in the air easily adheres to the bleeding silicone oil, and therefore, conduction requires insulation of circuit nodes, and the service life of the electronic components is reduced. The prior art also has difficulty in taking account of heat-conducting property, flexibility and oil seepage prevention property.
The Chinese invention patent CN107880842B discloses a flexible heat-conducting gasket and a preparation method thereof, wherein the flexible heat-conducting gasket is prepared from a component A and a component B: the component A comprises 100 parts of base rubber and 0.5-4 parts of catalyst; the component B comprises 100 parts of base rubber, 0.3-3 parts of cross-linking agent, 0-3 parts of chain extender, 0.1-2 parts of hydrogen-containing silane and 0.1-1 part of inhibitor; the base rubber is prepared from the following components in percentage by weight of 1: 6-10 parts of vinyl silicone oil and a heat-conducting filler; the cross-linking agent is side chain hydrogen-containing silicone oil, and the chain extender is end hydrogen-containing silicone oil. The hardness of the flexible heat-conducting pad is 20-40, and the heat conductivity is 2.84-2.87W (m.K)-1Although flexibility and heat conductivity are basically considered, the formula contains hydrogen-containing silane due to high content of silicone oil, the cross-linking agent is side chain hydrogen-containing silicone oil, the chain extender is end hydrogen-containing silicone oil, and no effective oil seepage prevention measure is adopted, the oil seepage prevention performance of the technology is poor, the heat-conducting filler is selected from at least one of aluminum oxide, zinc oxide, boron nitride, aluminum nitride, ceramic powder and aluminum powder, the using amount of the heat-conducting filler is large, the compatibility of the organic components is poor, the hardness of the material is 20-40, and the whole material is still hard.
Disclosure of Invention
Aiming at the defects of the heat-conducting gasket in the prior art, the invention aims to provide the high-performance silicone oil-based flexible heat-conducting gasket which is low in cost and has heat-conducting performance, flexibility and oil seepage prevention performance. The high heat-conducting performance is achieved under the condition of low filler addition, the flexibility and the high heat conductivity of the gasket are guaranteed, the low-cost preparation is realized, and the problems that the preparation process of the heat-conducting gasket in the prior art is complex, the cost is high, the flexibility is poor, and the oil leakage is easy are effectively solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-performance silicone oil-based flexible heat-conducting gasket is prepared by carrying out vacuum pumping treatment on a flowable slurry obtained by stirring a modified composite filler, vinyl-terminated silicone oil, hydrogen-containing silicone oil, an inhibitor and a platinum catalyst at 60-80 ℃ and carrying out heating forming on the slurry; the modified composite filler is prepared by adding crystalline flake graphite, silver powder and a silane coupling agent into absolute ethyl alcohol for ultrasonic treatment, heating, stirring and drying; the particle size of the crystalline flake graphite is 50-325 meshes; the diameter of the silver powder is 1-10 nm.
In order to further achieve the purpose of the present invention, preferably, the raw materials of the heat conducting gasket comprise the following components in parts by weight: 120-240 parts of vinyl-terminated silicone oil, 6-12 parts of hydrogen-containing silicone oil, 0.01-0.05 part of inhibitor, 0.01-0.2 part of platinum catalyst, 50-125 parts of flake graphite, 5-12.5 parts of silver powder, and the amount of silane coupling agent is 2-5% of the total mass of the flake graphite and the silver powder.
Preferably, the weight ratio of the crystalline flake graphite to the silver powder is 90: 10-95: 5.
Preferably, the silane coupling agent is at least one of gamma-aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane and gamma-methacryloxypropyltrimethoxysilane.
Preferably, the vinyl-terminated silicone oil is vinyl-terminated polydimethylsiloxane (Vi-PDMS), the viscosity is 90-1000 mPa s, and the vinyl content is 0.7-1.4 wt%.
Preferably, the hydrogen content of the hydrogen-containing silicone oil is 0.17-0.22 wt%.
Preferably, the inhibitor is one or more of 1-ethynylcyclohexanol, maleate, fumarate, organic phosphine and alkyne;
preferably, the catalyst is Karstedt platinum catalyst, the complex is formed by zero-valent platinum and divinyl tetramethyl disilane, and the concentration of the zero-valent platinum in the catalyst is 1000-3000 ppm.
The preparation method of the high-performance silicone oil-based flexible heat conduction gasket is characterized by comprising the following steps of:
1) adding the crystalline flake graphite, the silver powder and the silane coupling agent into absolute ethyl alcohol, performing ultrasonic treatment, uniformly stirring, performing suction filtration, and drying to obtain a modified composite filler;
2) adding the modified composite filler obtained in the step 1), the vinyl-terminated silicone oil, the hydrogen-containing silicone oil, the inhibitor and the catalyst into a high-speed stirrer for mixing to obtain uniform and flowable slurry;
3) vacuumizing the slurry obtained in the step 2) at room temperature, taking out and placing in a mold;
4) and placing the mold in an oven at 60-80 ℃ for heating for 120-150 min to obtain a molded product, cooling to room temperature, and demolding to finally obtain the silicone oil-based flexible heat-conducting gasket.
Preferably, in the step 1), the time of ultrasonic treatment is 20-30 min; the stirring is uniformly realized by heating and stirring for 4-6 hours in a heat collection type magnetic stirrer; the drying after suction filtration is to transfer the product after suction filtration to a vacuum drying oven at 80-100 ℃ for drying for 6-12 h;
in the step 2), the rotating speed of the high-speed stirrer during mixing and dispersing is 200-800 r/min, and the dispersing time is 120-150 min;
in the step 3), the vacuumizing treatment time is 20-40 min;
in the step 4), the heating time in the oven is 120-150 min.
Preferably, the heating and stirring speed in the heat collection type magnetic stirrer is 350-450 r/min, and the temperature is 50-80 ℃.
Compared with the prior art, the invention has the beneficial technical effects that:
1. although the problem that the interface thermal resistance is greatly improved because the natural scale with large particle size is adopted in the heat-conducting gasket and the particle size of the traditional filler is smaller, the particles often exist in a form of 'conglomerate', the composite material is hard and brittle and the mechanical property is reduced due to the addition of large-particle scale graphite in the prior art, so that the application of the scale graphite filled polymer composite material is limited. The invention adopts the large particles of the crystalline flake graphite with the particle size of 50-325 meshes, compounds the crystalline flake graphite with the silver powder of small particles, modifies the crystalline flake graphite by the silane coupling agent and matches the terminal vinyl silicone oil in the raw material, and effectively solves the problems of hard and brittle property and oil leakage of the silicon-containing filler existing in the large particle crystalline flake graphite serving as the heat-conducting filler in the prior art.
2. According to the invention, after the silver powder is added and the coupling agent is treated, the prepared gasket heat conducting structure is more compact and is more uniformly dispersed in the matrix due to the compounding of the crystalline flake graphite and the fillers with different sizes of the silver powder, so that the flexibility of the heat conducting gasket is improved, the oil seepage of the heat conducting gasket is obviously improved, the hardness of the material obtained by the invention is higher than that of the flexible heat conducting gasket of the Chinese patent application CN107880842B, and the hardness of the flexible heat conducting gasket is 20-40 HA.
3. According to the invention, the coupling agent is adopted to pretreat the surface of the filler, so that the coupling agent can be subjected to full hydrolysis reaction with the filler, and the inorganic filler is combined with the vinyl-terminated silicone oil as a bridge, so that the adhesion between the heat-conducting filler and the silicone oil matrix is enhanced, the agglomeration of the inorganic filler is reduced, the heat conductivity of the heat-conducting composite material is improved, the heat-conducting structure of the prepared gasket is more compact, and the oil seepage rate of the gasket is reduced.
4. The invention does not use toxic organic solvent, and is environment-friendly;
5. the flexible heat conduction gasket prepared by the invention has the characteristics of fast heat conduction, uniform and stable temperature, long service life, reusability and the like under the condition of relatively low filler addition amount, and simultaneously, the preparation cost of the gasket is also reduced.
Detailed Description
For better understanding of the present invention, the present invention will be further described with reference to specific examples, but the scope of the present invention is not limited to the specific examples.
Example 1:
a preparation method of a high-performance silicon oil-based flexible heat-conducting gasket comprises the following steps:
1) adding 15g of 150-mesh crystalline flake graphite, 0.3g of 1nm silver powder and 0.45g of silane coupling agent gamma-methacryloxypropyltrimethoxysilane into 200g of absolute ethyl alcohol, carrying out ultrasonic treatment for 30min, placing the mixture into a heat collection type magnetic stirrer, heating and stirring for 6h at 60 ℃ at 350r/min, carrying out suction filtration, and transferring the mixture into a 100 ℃ vacuum drying oven for drying for 12h to obtain a modified composite filler;
2) adding 12.6g of the modified composite filler obtained in the step 1), 12g of 300 mPa.s terminal vinyl silicone oil, 0.6g of hydrogen-containing silicone oil with the hydrogen content of 0.2 wt%, 0.01g of 1-ethynyl cyclohexanol and 100 mu L of 3000ppm Karstedt platinum catalyst into a high-speed stirrer, and uniformly mixing for 10min at the rotating speed of 400r/min to obtain uniform and flowable slurry;
3) vacuumizing the slurry obtained in the step 2) at room temperature for 30min, taking out and placing in a mold;
4) and placing the mould in an oven at 80 ℃ for heating for 120min, cooling to room temperature, and demoulding to finally obtain the molded product flexible heat conduction gasket with the diameter of 35mm and the thickness of 10 mm.
Example 2:
a preparation method of a high-performance silicon oil-based flexible heat-conducting gasket comprises the following steps:
1) adding 15g of 150-mesh crystalline flake graphite, 0.6g of 5nm silver powder and 0.45g of silane coupling agent gamma-methacryloxypropyltrimethoxysilane into 200g of absolute ethyl alcohol, carrying out ultrasonic treatment for 30min, placing the mixture into a heat collection type magnetic stirrer, heating and stirring for 6h at 60 ℃ at 350r/min, carrying out suction filtration, and transferring the mixture into a 100 ℃ vacuum drying oven for drying for 12h to obtain a modified composite filler;
2) adding 12.6g of the modified composite filler obtained in the step 1), 12g of 300 mPa.s terminal vinyl silicone oil, 0.6g of hydrogen-containing silicone oil with the hydrogen content of 0.2 wt%, 0.01g of 1-ethynyl cyclohexanol and 100 mu L of 3000ppm Karstedt platinum catalyst into a high-speed stirrer, and uniformly mixing for 10min at the rotating speed of 400r/min to obtain uniform and flowable slurry;
3) vacuumizing the slurry obtained in the step 2) at room temperature for 30min, taking out and placing in a mold;
4) and placing the mould in an oven at 80 ℃ for heating for 120min, cooling to room temperature, and demoulding to finally obtain the molded product flexible heat conduction gasket with the diameter of 35mm and the thickness of 10 mm.
Example 3:
a preparation method of a high-performance silicon oil-based flexible heat-conducting gasket comprises the following steps:
1) adding 15g of 150-mesh crystalline flake graphite, 0.9g of 10nm silver powder and 0.45g of silane coupling agent gamma-methacryloxypropyltrimethoxysilane into 200g of absolute ethyl alcohol, carrying out ultrasonic treatment for 30min, placing the mixture into a heat collection type magnetic stirrer, heating and stirring for 6h at 60 ℃ at 350r/min, carrying out suction filtration, and transferring the mixture into a 100 ℃ vacuum drying oven for drying for 12h to obtain a modified composite filler;
2) adding 12.6g of the modified composite filler obtained in the step 1), 12g of 300 mPa.s terminal vinyl silicone oil, 0.6g of hydrogen-containing silicone oil with the hydrogen content of 0.2 wt%, 0.01g of 1-ethynyl cyclohexanol and 100 mu L of 3000ppm Karstedt platinum catalyst into a high-speed stirrer, and uniformly mixing for 10min at the rotating speed of 400r/min to obtain uniform and flowable slurry;
3) vacuumizing the slurry obtained in the step 2) at room temperature for 30min, taking out and placing in a mold;
4) and placing the mould in an oven at 80 ℃ for heating for 120min, cooling to room temperature, and demoulding to finally obtain the molded product flexible heat conduction gasket with the diameter of 35mm and the thickness of 10 mm.
Comparative example 1:
1) adding 12g of 300 mPa.s terminal vinyl silicone oil, 0.6g of hydrogen-containing silicone oil with the hydrogen content of 0.2 wt%, 0.01g of 1-ethynylcyclohexanol and 100 mu L of 3000ppm Karstedt platinum catalyst into a high-speed stirrer, and uniformly mixing for 10min at the rotating speed of 400r/min to obtain uniform and flowable slurry;
2) vacuumizing the slurry obtained in the step 1) at room temperature for 30min, taking out and placing in a mold;
3) and placing the mould in an oven at 80 ℃ for heating for 120min, cooling to room temperature, and demoulding to finally obtain a molded product with the diameter of 35mm and the thickness of 10 mm.
Comparative example 2:
1) adding 12.6g of 150-mesh crystalline flake graphite, 12g of 300 mPa.s terminal vinyl silicone oil, 0.6g of hydrogen-containing silicone oil with the hydrogen content of 0.2 wt%, 0.01g of 1-ethynyl cyclohexanol and 100 mu L of 3000ppm Karstedt platinum catalyst into a high-speed stirrer, and uniformly mixing for 10min at the rotating speed of 400r/min to obtain uniform and flowable slurry;
2) vacuumizing the slurry obtained in the step 1) at room temperature for 30min, taking out and placing in a mold;
3) and placing the mould in an oven at 80 ℃ for heating for 120min, cooling to room temperature, and demoulding to finally obtain a molded product with the diameter of 35mm and the thickness of 10 mm.
To verify the performance of the product of the invention, the following tests were performed:
(I) thermal conductivity test
The heat conductive gaskets of examples 1 to 3 and comparative examples 1 to 2 were tested for heat conductive properties using a Hot-Disk thermal conductivity tester (TPS-2500S). The test results are shown in Table 1.
(II) hardness test
The hardness of the thermal conductive gaskets of examples 1 to 3 and comparative examples 1 to 2 was measured by using a shore hardness meter in AM type. The test results are shown in Table 1.
(III) oil bleeding test
The heat-conducting gaskets of the examples 1 to 3 and the comparative examples 1 to 2 were subjected to high-temperature heating and heat cycle experiments, and 100 heat cycle experiments were performed in a temperature surge tank at 100 to 120 ℃. And (3) placing the sample subjected to high-temperature heating and thermal cycling on a steel plate sprayed with epoxy resin black paint, placing the test sample in a 45 ℃ oven, and keeping the temperature for 72 hours to test the oil permeability of the sample, wherein the oil permeability is expressed by oil permeability. The oil permeability is defined as the ratio of the diameter of the oil stain exuded from the sample to the initial diameter of the sample, i.e. the oil permeability r ═ Dm/D0Wherein D is0Is the initial diameter of the sample, DmThe diameter of the oil stain contained after the sample was oiled. When the oil is not leaked, the r is 1, and the larger the r value is, the more obvious the oil leakage of the sample is. To reduce measurement errors, two samples were taken for each set of tests and tested in parallel. The test uses a ZTS010 type temperature impact box to carry out the high and low temperature tests according to Q/RJ 125-2002' satellite thermal control coating cold and hot alternation test methodAnd (4) performing a warm-heat cycle test. The test results are shown in Table 2.
TABLE 1
TABLE 2
As can be seen from the above tables 1 and 2, the thermal conductivity coefficient of the thermal conductive gasket obtained by the invention exceeds 2.445W/mK, the hardness is below 20, complete oil seepage prevention is realized in 12 hours, the oil seepage rate r is 1.026 in 72 hours, and the oil seepage prevention performance is very good. Therefore, the heat conducting gasket really realizes the heat conducting performance, the flexibility and the oil seepage prevention performance of the heat conducting gasket.
The heat conductivity of the heat conducting gaskets of the examples 1-3 is good, and is obviously improved compared with the comparative example, particularly, the heat conductivity coefficient of the example 1 reaches 2.544W/mK. Compared with the comparative example 1, the ratio is about 15 times higher, which shows that the heat-conducting performance of the heat-conducting gasket can be obviously improved by the matching of the filler crystalline flake graphite and the silver powder.
In the Chinese invention patent CN106751848A, aluminum nitride, silicon carbide and nano silver wires are used as heat-conducting fillers, and different proportions are adopted to prepare heat-conducting silicone grease with high heat conductivity coefficient and better high-temperature resistance, wherein the heat conductivity coefficient is 2.0W/mK.
Comparative examples 1-3 and comparative example 2. The dispersibility of the filler in the vinyl-terminated silicone oil is poor, so that high interface thermal resistance exists, namely an effective heat conduction path cannot be formed, and the heat conductivity coefficient of the heat conduction gasket is not high; in the embodiments 1-3, the coupling agent can be subjected to full hydrolysis reaction with the filler by adopting the coupling agent to pretreat the surface of the filler, and the inorganic filler and the vinyl-terminated silicone oil are combined together as a bridge, so that the adhesion between the heat-conducting filler and the silicone oil matrix is enhanced, the self-aggregation of the inorganic filler is reduced, and the heat-conducting property of the heat-conducting composite material is improved. In addition, the heat conductive gaskets of examples 1-3 are superior to comparative example 2 in flexibility and oil permeability. The prepared gasket heat conducting structure is more compact and more uniformly dispersed in the matrix due to the addition of the silver powder and the compounding of the fillers with different sizes after the treatment of the coupling agent, so that the flexibility of the heat conducting gasket is improved, and the oil leakage of the heat conducting gasket is obviously improved.
Claims (10)
1. A high-performance silicone oil-based flexible heat-conducting gasket is characterized in that the high-performance silicone oil-based flexible heat-conducting gasket is prepared by heating and molding a slurry with fluidity, which is obtained by stirring a modified composite filler, vinyl-terminated silicone oil, hydrogen-containing silicone oil, an inhibitor and a platinum catalyst, at 60-80 ℃ after vacuumizing treatment; the modified composite filler is prepared by adding crystalline flake graphite, silver powder and a silane coupling agent into absolute ethyl alcohol for ultrasonic treatment, heating, stirring and drying; the particle size of the crystalline flake graphite is 50-325 meshes; the diameter of the silver powder is 1-10 nm.
2. The high-performance silicone oil-based flexible heat-conducting gasket as claimed in claim 1, wherein the heat-conducting gasket comprises the following raw materials in parts by weight: 120-240 parts of vinyl-terminated silicone oil, 6-12 parts of hydrogen-containing silicone oil, 0.01-0.05 part of inhibitor, 0.01-0.2 part of platinum catalyst, 50-125 parts of flake graphite, 5-12.5 parts of silver powder, and the amount of the silane coupling agent is 2-5% of the total mass of the flake graphite and the silver powder.
3. The high-performance silicone oil-based flexible heat-conducting gasket as claimed in claim 2, wherein the weight ratio of the crystalline flake graphite to the silver powder is 90: 10-95: 5.
4. The high performance silicone oil based flexible thermal conductive gasket of claim 1, wherein the silane coupling agent is at least one of γ -aminopropyltriethoxysilane, γ -glycidoxypropyltrimethoxysilane, and γ -methacryloxypropyltrimethoxysilane.
5. The high-performance silicone oil-based flexible heat-conducting gasket as claimed in claim 1, wherein the vinyl-terminated silicone oil is vinyl-terminated polydimethylsiloxane, the viscosity is 90 to 1000 mPa-s, and the vinyl content is 0.7 to 1.4 wt%.
6. The high-performance silicone oil-based flexible heat-conducting gasket as claimed in claim 1, wherein the hydrogen content of the hydrogen-containing silicone oil is 0.17-0.22 wt%.
7. The high-performance silicone oil-based flexible thermal conductive gasket as set forth in claim 1, wherein said inhibitor is one or more of 1-ethynylcyclohexanol, maleate, fumarate, organophosphine and acetylenic inhibitors;
the catalyst is Karstedt platinum catalyst, and is a complex formed by zero-valent platinum and divinyl tetramethyl disilane, and the concentration of the zero-valent platinum in the catalyst is 1000-3000 ppm.
8. The method for preparing the high-performance silicone oil-based flexible thermal conductive gasket as recited in any one of claims 1 to 7, comprising the steps of:
1) adding the crystalline flake graphite, the silver powder and the silane coupling agent into absolute ethyl alcohol, performing ultrasonic treatment, uniformly stirring, performing suction filtration, and drying to obtain a modified composite filler;
2) adding the modified composite filler obtained in the step 1), the vinyl-terminated silicone oil, the hydrogen-containing silicone oil, the inhibitor and the catalyst into a high-speed stirrer for mixing to obtain uniform and flowable slurry;
3) vacuumizing the slurry obtained in the step 2) at room temperature, taking out and placing in a mold;
4) and placing the mold in an oven at 60-80 ℃ for heating for 120-150 min to obtain a molded product, cooling to room temperature, and demolding to finally obtain the silicone oil-based flexible heat-conducting gasket.
9. The preparation method of the flexible heat-conducting gasket according to claim 7, wherein in the step 1), the ultrasonic treatment time is 20-30 min; the stirring is uniformly realized by heating and stirring for 4-6 hours in a heat collection type magnetic stirrer; the drying after the suction filtration is to transfer the mixture after the suction filtration to a vacuum drying oven at the temperature of 80-100 ℃ for drying for 6-12 h;
in the step 2), the rotating speed of the high-speed stirrer during mixing and dispersing is 200-800 r/min, and the dispersing time is 120-150 min;
in the step 3), the vacuumizing treatment time is 20-40 min;
in the step 4), the heating time in the oven is 120-150 min.
10. The method for preparing a flexible heat conducting gasket according to claim 9, wherein the rotational speed of heating and stirring in the heat collection type magnetic stirrer is 350-450 r/min, and the temperature is 50-80 ℃.
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