A thermally conductive rubber composite material and its preparation method and application

Abstract

The present invention discloses a thermally conductive rubber composite material, its preparation method, and application. The thermally conductive rubber composite material of the present invention comprises the following components in parts by mass: liquid rubber: 70 to 90 parts; fluorinated liquid rubber: 10 to 30 parts; thermally conductive filler: 400 to 2000 parts; reinforcing agent: 1 to 20 parts; photoinitiator: 1 to 3 parts; cross-linking agent: 3 to 10 parts. The thermally conductive rubber composite material of the present invention has the advantages of good thermal conductivity, good flame retardancy, good insulation, and no volatilization or precipitation of silicone oil during long-term heating and baking. In addition, the preparation process is simple, the vulcanization speed is fast, there is no VOC emission, and it is energy-saving and environmentally friendly. The gasket made of the thermally conductive rubber composite material has a soft texture, a smooth surface, and adjustable hardness and thickness. It can well meet the thermal conductivity and heat dissipation needs of precision electronic components and optical lenses that are sensitive to silicone oil in the fields of consumer electronics, new energy vehicles, LED lighting, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of thermally conductive elastic materials, and in particular to a thermally conductive rubber composite material and a preparation method and application thereof. Background Art

[0002] With the rapid development of science and technology, electronic components tend to be integrated, miniaturized, and high-powered. In order to solve the heat conduction and heat dissipation problems of high-power products such as electronic chips, new energy vehicle power batteries, high-power stage lights, and LED lighting, various thermally conductive elastic materials (such as thermally conductive gaskets, thermally conductive gels, etc.) have been widely used. However, most of the existing thermally conductive elastic materials are based on polysiloxane materials (such as vinyl silicone oil, hydrogen-containing silicone oil, solid silicone rubber, etc.). During the long-term high-temperature baking process of these materials, some of the small molecule silicone oil that has not yet been cross-linked will precipitate or evaporate. This part of the silicone oil will not only form a large area of ​​oil stains on the surface of the optical lens, seriously affecting the light transmittance of the optical components, but the oil and gas components will also affect the working stability and service life of high-precision electronic components. In addition, the thermal conductivity, flame retardancy, insulation and other properties of existing thermally conductive elastic materials need to be further improved.

[0003] Therefore, it is of great significance to develop a thermally conductive elastic material with good thermal conductivity, good flame retardancy, good insulation, and no silicone oil volatilization or precipitation when heated and baked for a long time. Summary of the Invention

[0004] The purpose of the present invention is to provide a thermally conductive rubber composite material and a preparation method and application thereof.

[0005] The technical solution adopted by the present invention is:

[0006] A thermally conductive rubber composite material comprising the following components in parts by mass:

[0007] Liquid rubber: 70 to 90 parts;

[0008] Fluorinated liquid rubber: 10 to 30 parts;

[0009] Thermal conductive filler: 400 to 2000 parts;

[0010] Reinforcing agent: 1 to 20 parts;

[0011] Photoinitiator: 1 to 3 parts;

[0012] Cross-linking agent: 3 to 10 parts.

[0013] Preferably, a thermally conductive rubber composite material comprises the following components in parts by mass:

[0014] Liquid rubber: 90 parts;

[0015] Fluorinated liquid rubber: 10 parts;

[0016] Thermal conductive filler: 500 to 2000 parts;

[0017] Reinforcing agent: 5 to 15 parts;

[0018] Photoinitiator: 1 to 3 parts;

[0019] Cross-linking agent: 5 to 8 parts.

[0020] Preferably, the liquid rubber is at least one of liquid EPDM rubber, liquid nitrile rubber, and liquid fluororubber.

[0021] Preferably, the number average molecular weight of the liquid rubber is 5,000 to 100,000.

[0022] Preferably, the mass percentage of fluorine in the fluorinated liquid rubber is 0.5% to 2.0%.

[0023] Preferably, the fluorinated liquid rubber is prepared by the following method: placing liquid rubber in a fluorine-nitrogen mixed gas for fluorination treatment, thereby obtaining the fluorinated liquid rubber.

[0024] Preferably, the volume fraction of fluorine gas in the fluorine-nitrogen mixed gas is 10% to 20%.

[0025] Preferably, the fluorination treatment is carried out under the conditions of a fluorine-nitrogen mixed gas pressure of 0.1 MPa to 0.3 MPa and a temperature of 30° C. to 60° C., and the fluorination treatment time is 60 min to 120 min.

[0026] Preferably, the thermally conductive filler is at least one of aluminum oxide, aluminum hydroxide, zinc oxide, aluminum nitride, and boron nitride.

[0027] Preferably, the reinforcing agent is at least one of precipitated silica, fumed silica, and nano-calcium carbonate.

[0028] Preferably, the photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP), 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone (MMMP), and 2,4-diethylthioxanthone (DETX).

[0029] Preferably, the cross-linking agent is at least one of isooctyl thioglycolate, 1,4-butanediol di(3-mercaptopropionate), and ethylene glycol di(3-mercaptopropionate).

[0030] A method for preparing the thermally conductive rubber composite material as described above comprises the following steps:

[0031] 1) uniformly mixing a thermally conductive filler, a reinforcing agent, a photoinitiator and a cross-linking agent to obtain a mixture;

[0032] 2) uniformly mixing the liquid rubber, fluorinated liquid rubber and the mixed material, and then degassing to obtain a mixed rubber;

[0033] 3) The mixed adhesive is irradiated with ultraviolet light for light curing to obtain a thermally conductive rubber composite material.

[0034] Preferably, the mixing in step 1) is carried out in a homogenizer, the speed of the homogenizer is 800 r / min to 2500 r / min, and the mixing time is 1 min to 5 min.

[0035] Preferably, the mixture is dried after the mixing in step 1).

[0036] Preferably, the drying is carried out at 60° C. to 120° C., and the drying time is 5 min to 30 min.

[0037] Preferably, the mixing in step 2) is carried out in a homogenizer, the speed of the homogenizer is 800 r / min to 2500 r / min, and the mixing time is 10 s to 200 s.

[0038] Preferably, the degassing method in step 2) is vacuuming, and the vacuuming time is 10 minutes to 60 minutes.

[0039] Preferably, in step 3), the light curing is performed at a UV irradiation power of 100 mW / cm 2 ~300mW / cm 2 The light curing time is 150s to 300s.

[0040] A gasket comprises the above-mentioned thermal conductive rubber composite material.

[0041] The beneficial effects of the present invention are: the thermally conductive rubber composite material of the present invention has the advantages of good thermal conductivity, good flame retardancy, good insulation, and no volatilization or precipitation of silicone oil during long-term heating and baking, and its preparation process is simple, the vulcanization speed is fast, there is no VOC emission, and it is energy-saving and environmentally friendly. The gasket made of it has a soft texture, a smooth surface, and adjustable hardness and thickness. It can well meet the thermal conductivity and heat dissipation needs of precision electronic components and optical lenses that are sensitive to silicone oil in consumer electronics, new energy vehicles, LED lighting and other fields.

[0042] Specifically:

[0043] 1) The thermally conductive rubber composite material of the present invention uses a liquid rubber without an organosilicon component as a matrix, which can effectively avoid the precipitation and volatilization of small organosilicon molecules under high-temperature baking conditions. It has high UV curing efficiency, low energy consumption, no VOC emissions, and is environmentally friendly.

[0044] 2) The thermally conductive rubber composite material of the present invention contains fluorinated liquid rubber. After fluorination, some of the carbon-carbon double bonds on the third monomer of the liquid rubber are opened and covalently linked to fluorine atoms. This increases the fluorine content in the molecular structure of the liquid rubber, enhances the polarity of the rubber molecules, and improves the high temperature resistance and oil resistance of the rubber. Ultimately, the gasket made of the thermally conductive rubber composite material can be used in high temperature and oil resistant environments.

[0045] 3) The thermally conductive rubber composite material of the present invention has high resistivity and resistance to electrical breakdown, and has good flame retardancy, good thermal conductivity, and low thermal resistance, which can well meet the thermal conductivity and heat dissipation requirements of products such as precision electronic components and optical lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is an appearance diagram of the thermally conductive rubber composite material in Example 1.

[0047] Figure 2 This is the SEM image of the thermally conductive rubber composite material in Example 3. DETAILED DESCRIPTION

[0048] The present invention will be further explained and illustrated below with reference to specific embodiments.

[0049] Example 1:

[0050] A thermally conductive rubber composite material, the composition of which is shown in the following table:

[0051] Table 1 Composition of a thermally conductive rubber composite material

[0052]

[0053]

[0054] Note:

[0055] Fluorinated liquid EPDM rubber is prepared by the following method: adding liquid EPDM rubber to a reactor, introducing a fluorine-nitrogen mixture (the volume fraction of fluorine gas is 10%) until the pressure of the fluorine-nitrogen mixture in the reactor reaches 0.1 MPa, and then performing a fluorination treatment at 30° C. for 120 minutes to obtain fluorinated liquid EPDM rubber (the mass percentage of fluorine is 0.8%).

[0056] The preparation method of the thermally conductive rubber composite material comprises the following steps:

[0057] 1) Add aluminum oxide, aluminum nitride, aluminum hydroxide, precipitated silica, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and isooctyl thioglycolate into a mixing tank, set the speed of the homogenizer to 1500 r / min, stir for 100 s, and then place the material in an oven at 70° C. for 15 min to obtain a mixture;

[0058] 2) adding liquid EPDM rubber, fluorinated liquid EPDM rubber and the mixture into a mixing tank and mixing them with a homogenizer using a three-stage stirring mode: the first stage, 1500 r / min, 30 s; the second stage, 2500 r / min, 15 s; the third stage, 1300 r / min, 20 s, and then placing the materials in a vacuum oven for vacuum degassing for 15 minutes to obtain a mixed rubber;

[0059] 3) After adding release film on the top and bottom of the mixed glue, press it into a thin sheet with a thickness of 0.5mm using a flat vulcanizer, and then use a UV lamp with an irradiation power of 200mW / cm 2 The thermal conductive rubber composite material was obtained by curing for 200s under the conditions of .

[0060] Example 2:

[0061] A thermally conductive rubber composite material, the composition of which is shown in the following table:

[0062] Table 2 Composition of a thermally conductive rubber composite material

[0063]

[0064]

[0065] Note:

[0066] Fluorinated liquid EPDM rubber is prepared by the following method: adding liquid EPDM rubber to a reactor, introducing a fluorine-nitrogen mixture (the volume fraction of fluorine gas is 15%) until the pressure of the fluorine-nitrogen mixture in the reactor reaches 0.2 MPa, and then performing a fluorination treatment at 50° C. for 60 minutes to obtain fluorinated liquid EPDM rubber (the mass percentage of fluorine is 1.5%).

[0067] The preparation method of the thermally conductive rubber composite material comprises the following steps:

[0068] 1) Add aluminum oxide, boron nitride, aluminum hydroxide, fumed silica, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 1,4-butanediol di(3-mercaptopropionate) to a stirring tank, set the speed of the homogenizer to 1200 r / min, stir for 60 seconds, and then place the material in an oven at 70°C for 15 minutes to obtain a mixture;

[0069] 2) adding liquid EPDM rubber, fluorinated liquid EPDM rubber and the mixture into a mixing tank and mixing them with a homogenizer using a three-stage stirring mode: the first stage, 1400 r / min, 25 s; the second stage, 2500 r / min, 60 s; the third stage, 1200 r / min, 35 s, and then placing the materials in a vacuum oven for vacuum degassing for 35 minutes to obtain a mixed rubber;

[0070] 3) After adding release film on the top and bottom of the mixed adhesive, press it into a thin sheet with a thickness of 0.5mm using a flat vulcanizer, and then use a UV lamp at an irradiation power of 250mW / cm 2 The thermal conductive rubber composite material was obtained by curing for 150 seconds under the conditions of .

[0071] Example 3:

[0072] A thermally conductive rubber composite material, the composition of which is shown in the following table:

[0073] Table 3 Composition of a thermally conductive rubber composite material

[0074]

[0075]

[0076] Note:

[0077] Fluorinated liquid EPDM rubber is prepared by the following method: adding liquid EPDM rubber to a reactor, introducing a fluorine-nitrogen mixture (the volume fraction of fluorine gas is 20%) until the pressure of the fluorine-nitrogen mixture in the reactor reaches 0.1 MPa, and then performing a fluorination treatment at 40° C. for 120 minutes to obtain fluorinated liquid EPDM rubber (the mass percentage of fluorine is 1.0%).

[0078] The preparation method of the thermally conductive rubber composite material comprises the following steps:

[0079] 1) Aluminum oxide, aluminum hydroxide, aluminum nitride, nano-calcium carbonate, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone, and 1,4-butanediol di(3-mercaptopropionate) were added to a stirring tank, the speed of the homogenizer was set to 1300 r / min, and the mixture was stirred for 90 seconds. The mixture was then placed in an oven at 80°C for 20 minutes to obtain a mixture;

[0080] 2) adding liquid EPDM rubber, fluorinated liquid EPDM rubber, and the mixture into a mixing tank and mixing them with a homogenizer using a three-stage stirring mode: the first stage, 1800 r / min, 20 s; the second stage, 2400 r / min, 130 s; the third stage, 900 r / min, 35 s, and then placing the materials in a vacuum oven for vacuum degassing for 45 minutes to obtain a mixed rubber;

[0081] 3) After adding release film on the top and bottom of the mixed adhesive, press it into a sheet with a thickness of 1mm using a flat vulcanizer, and then use a UV lamp at an irradiation power of 280mW / cm 2 The thermal conductive rubber composite material was obtained by curing for 200s under the conditions of .

[0082] Example 4:

[0083] A thermally conductive rubber composite material, the composition of which is shown in the following table:

[0084] Table 4 Composition of a thermally conductive rubber composite material

[0085]

[0086]

[0087] Note:

[0088] Fluorinated liquid EPDM rubber is prepared by the following method: adding liquid EPDM rubber to a reactor, introducing a fluorine-nitrogen mixture (the volume fraction of fluorine gas is 15%) until the pressure of the fluorine-nitrogen mixture in the reactor reaches 0.2 MPa, and then performing a fluorination treatment at 50° C. for 60 minutes to obtain fluorinated liquid EPDM rubber (the mass percentage of fluorine is 1.9%).

[0089] The preparation method of the thermally conductive rubber composite material comprises the following steps:

[0090] 1) Add alumina, boron nitride, aluminum nitride, precipitated silica, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone, and ethylene glycol di(3-mercaptopropionate) into a stirring tank, set the speed of the homogenizer to 1800 r / min, stir for 120 s, and then place the material in an oven at 80° C. for 25 min to obtain a mixture;

[0091] 2) adding liquid EPDM rubber, fluorinated liquid EPDM rubber, and the mixture into a mixing tank and mixing them with a homogenizer using a three-stage stirring mode: the first stage, 1400 r / min, 35 s; the second stage, 2400 r / min, 100 s; the third stage, 1000 r / min, 40 s, and then placing the materials in a vacuum oven for vacuum degassing for 40 min to obtain a mixed rubber;

[0092] 3) After adding release film on the top and bottom of the mixed glue, press it into a thin sheet with a thickness of 1mm using a flat vulcanizer, and then use a UV lamp at an irradiation power of 300mW / cm 2 The thermal conductive rubber composite material was obtained by curing for 200s under the conditions of .

[0093] Example 5:

[0094] A thermally conductive rubber composite material, the composition of which is shown in the following table:

[0095] Table 5 Composition of a thermally conductive rubber composite material

[0096]

[0097] Note:

[0098] Fluorinated liquid nitrile rubber is prepared by the following method: adding liquid nitrile rubber into a reactor, then introducing a fluorine-nitrogen mixed gas (the volume fraction of fluorine gas is 15%) until the pressure of the fluorine-nitrogen mixed gas in the reactor is 0.1 MPa, and then performing a fluorination treatment at 40° C. for 60 minutes to obtain a fluorinated liquid nitrile rubber (the mass percentage of fluorine is 1.0%).

[0099] The preparation method of the thermally conductive rubber composite material comprises the following steps:

[0100] 1) Add alumina, boron nitride, aluminum nitride, fumed silica, 2,4-diethylthioxanthone, and ethylene glycol bis(3-mercaptopropionate) to a stirring tank, set the speed of the homogenizer to 1800 r / min, stir for 90 seconds, and then place the material in an oven at 80° C. and dry for 20 minutes to obtain a mixture;

[0101] 2) adding the liquid nitrile rubber, the fluorinated liquid nitrile rubber, and the mixture into a mixing tank, and mixing them with a homogenizer using a three-stage stirring mode: the first stage, 1400 r / min, 35 s; the second stage, 2300 r / min, 80 s; the third stage, 1200 r / min, 45 s, and then placing the materials in a vacuum oven for vacuum degassing for 45 min to obtain a mixed rubber;

[0102] 3) After adding release film on the top and bottom of the mixed glue, press it into a thin sheet with a thickness of 0.5mm using a flat vulcanizer, and then use a UV lamp with an irradiation power of 200mW / cm 2 The thermal conductive rubber composite material was obtained by curing for 200s under the conditions of .

[0103] Comparative Example:

[0104] A thermally conductive silicone composite material, the composition of which is shown in the following table:

[0105] Table 6 Composition of a thermally conductive silicone composite material

[0106]

[0107] The preparation method of the thermally conductive silicone composite material comprises the following steps:

[0108] 1) Vinyl silicone oil, hydrogenated silicone oil, aluminum oxide, zinc oxide, aluminum hydroxide, and 1-ethynyl-1-cyclohexanol were added to a stirring tank and mixed using a homogenizer in a three-stage stirring mode: first stage, 1600 r / min, 80 s; second stage, 2500 r / min, 100 s; and third stage, 1200 r / min, 40 s to obtain a mixture;

[0109] 2) Add the mixture and Custer catalyst into a mixing tank and mix them with a homogenizer using a three-stage stirring mode: the first stage, 1200 r / min, 30 s; the second stage, 2500 r / min, 45 s; the third stage, 1200 r / min, 20 s, and then put the materials into a vacuum oven for vacuum degassing for 45 min to obtain a mixed glue;

[0110] 3) After adding release films on the top and bottom of the mixed rubber, press it into a thin sheet with a thickness of 1 mm using a flat vulcanizer, and then vulcanize it at 100°C for 30 minutes to obtain a thermally conductive silicone composite material.

[0111] Performance testing:

[0112] 1) The appearance of the thermally conductive rubber composite material in Example 1 is as follows Figure 1 As shown, the scanning electron microscope (SEM) image of the cross section of the thermal conductive rubber composite material in Example 3 is as follows Figure 2 shown.

[0113] Depend on Figure 1 It can be seen that the thermally conductive rubber composite material in Example 1 has a pure white appearance, a smooth and flat surface, a soft and elastic texture, and is slightly sticky on both sides.

[0114] Depend on Figure 2 It can be seen that the thermally conductive rubber composite material in Example 3 is composed of small spherical aluminum oxide particles, large spherical aluminum hydroxide particles and irregular aluminum nitride particles. The three particles of different particle sizes are matched with each other to form an efficient three-dimensional thermal conductive network, thereby improving the thermal conductivity of the thermally conductive rubber composite material.

[0115] 2) The performance test results of the thermally conductive rubber composite materials in Examples 1 to 5 and the thermally conductive silicone composite materials in the comparative example are shown in the following table:

[0116] Table 7 Performance test results of thermal conductive rubber composite materials and thermal conductive silicone composite materials

[0117]

[0118]

[0119] Note:

[0120] Thermal resistance: Refer to "ASTM D 5470-06 Standard Test Method for Thermal Transmission Properties of Thermally Conductive Electrical Insulating Materials" and use LW-9389 thermal resistance meter for testing;

[0121] Thermal conductivity: Tested with TPS 2500S thermal constant analyzer in accordance with GB / T 32064-2015 Test method for thermal conductivity and thermal diffusivity of building materials using transient plane heat source.

[0122] Density: Refer to "GB / T 14838-2009 Rubber and rubber products test methods - Determination of precision" and use MDJ-300S electronic density meter for testing;

[0123] Shore hardness: Refer to "GB / T 531.1-2008 Rubber, vulcanized or thermoplastic rubber - Test method for indentation hardness - Part 1: Shore durometer method (Shore hardness)", and use CLZ-AC Shore durometer for testing;

[0124] Volume resistivity: Refer to "GB / T 31838.2-2019 Dielectric and resistive properties of solid insulating materials Part 2: Resistance characteristics (DC method) Volume resistance and volume resistivity" and use PC40B high insulation resistance meter for testing;

[0125] Breakdown voltage strength: Refer to "GB / T 1695-2005 Vulcanized rubber - Determination of power frequency breakdown voltage strength and withstand voltage" and use 125B withstand voltage tester for testing;

[0126] Flame retardant grade: Refer to "GB / T 10707-2008 Rubber - Determination of combustion performance", tested using UL94 vertical and horizontal combustion tester;

[0127] Volatility rate of silicon-containing components: Refer to "GB / T 24131.1-2018 Raw rubber - Determination of volatile matter content - Part 1: Hot roller method and oven method" and use GT-7017-EL1 rubber aging chamber for testing.

[0128] From Table 7 we can see that:

[0129] a) Comparison of Example 1 and Example 2 shows that, under the same conditions of composition and amount of thermally conductive filler, the thermal conductivity of the thermally conductive rubber composite material prepared using liquid EPDM rubber with a number average molecular weight of 10,000 is higher than that of the thermally conductive rubber composite material prepared using liquid EPDM rubber with a number average molecular weight of 50,000, but the hardness is lower, while the volume resistivity and breakdown voltage strength are similar;

[0130] b) Comparison of Example 2 and Example 3 shows that when the amount of thermally conductive filler added is increased from 500 parts to 2000 parts, the thermal conductivity of the thermally conductive rubber composite material is significantly improved, and the overall performance is better than that of the other examples;

[0131] c) Comparison of Example 2 and Example 4 shows that when the aluminum hydroxide in the thermally conductive filler is completely replaced with an equal amount of aluminum nitride, the thermal conductivity and hardness of the thermally conductive rubber composite material are both higher;

[0132] d) Comparing Example 4 and Example 5, it can be seen that when a liquid acrylonitrile-butadiene rubber with a number average molecular weight of 30,000 is used to replace the liquid EPDM rubber with a number average molecular weight of 50,000, the thermal conductivity of the thermally conductive rubber composite material prepared does not change much, while the volume resistivity and breakdown resistance are slightly reduced, and the overall performance is still good;

[0133] e) After 72 hours of high-temperature baking, the hardness of the thermally conductive rubber composite materials in Examples 1 to 5 increased slightly, but the softness of the samples was still well maintained;

[0134] f) After 72 hours of high-temperature baking, the volatilization rate of the silicon-containing component of the thermally conductive rubber composite materials in Examples 1 to 5 was all 0, while the volatilization rate of the silicon-containing component of the thermally conductive silicone rubber composite material in the comparative example reached 0.86%, indicating that the thermally conductive rubber composite material based on liquid EPDM rubber or liquid nitrile rubber can achieve zero silicone oil volatilization;

[0135] In summary, the present invention can obtain a thermally conductive rubber composite material with high thermal conductivity, low thermal resistance, breakdown resistance, high temperature resistance, good flame retardancy, and adjustable hardness by compounding different liquid rubbers with a variety of thermally conductive fillers. The preparation process is efficient, green, and environmentally friendly.

[0136] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A thermally conductive rubber composite material, characterized in that: The composition comprises the following components in parts by weight: Liquid rubber: 70 to 90 parts; Fluorinated liquid rubber: 10 to 30 parts; Thermal conductive filler: 400 to 2000 parts; Reinforcing agent: 1 to 20 parts; Photoinitiator: 1 to 3 parts; Cross-linking agent: 3 to 10 parts; The liquid rubber is at least one of liquid EPDM rubber and liquid nitrile rubber; The mass percentage of fluorine in the fluorinated liquid rubber is 0.5% to 2.0%; The cross-linking agent is at least one of 1,4-butanediol di(3-mercaptopropionate) and ethylene glycol di(3-mercaptopropionate).

2. The thermally conductive rubber composite material according to claim 1, wherein: The number average molecular weight of the liquid rubber is 5,000 to 100,000.

3. The thermally conductive rubber composite material according to claim 1 or 2, characterized in that: The thermally conductive filler is at least one of aluminum oxide, aluminum hydroxide, zinc oxide, aluminum nitride, and boron nitride.

4. The thermally conductive rubber composite material according to claim 1 or 2, characterized in that: The reinforcing agent is at least one of precipitated silica, fumed silica, and nano calcium carbonate.

5. The thermally conductive rubber composite material according to claim 1 or 2, characterized in that: The photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone, and 2,4-diethylthioxanthone.

6. A method for preparing the thermally conductive rubber composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: 1) uniformly mixing the thermal conductive filler, reinforcing agent, photoinitiator and cross-linking agent to obtain a mixture; 2) Evenly mix the liquid rubber, fluorinated liquid rubber and the mixed material, and then degas to obtain a mixed rubber; 3) The mixed adhesive is irradiated with ultraviolet light for light curing to obtain a thermally conductive rubber composite material.

7. A gasket, characterized in that: A thermally conductive rubber composite material comprising the thermally conductive rubber composite material according to any one of claims 1 to 5.

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