Silicone cloth reinforced thermally conductive insulating gasket and preparation method thereof

Abstract

The application discloses a silica gel cloth reinforced heat-conducting insulating gasket, which comprises silica gel cloth layers and a silica gel body layer from bottom to top, wherein the silica gel cloth layers adopt single-side silica gel cloth. A preparation method of the silica gel cloth reinforced heat-conducting insulating gasket is as follows: spraying a silane coupling agent on the glass fiber surface of the single-side silica gel cloth after dilution and drying; adding vinyl silicone oil, hydrogen-containing silicone oil, a polymerization inhibitor and heat-conducting insulating flame-retardant fillers into a mixer and mixing uniformly, then adding a catalyst and mixing, starting a vacuum pump to vacuumize after uniform mixing; contacting the treated glass fiber surface of the single-side silica gel cloth with liquid mixture, carrying out integrated calendering, high-temperature curing, and cutting or punching into the silica gel cloth reinforced heat-conducting insulating gasket. The silica gel cloth layer in the silica gel cloth reinforced heat-conducting insulating gasket selects single-side silica gel cloth, the rough morphology of the glass fiber in the single-side silica gel cloth increases the bonding "contact points", and compared with double-side silica gel cloth which is traditionally used, the silica gel cloth reinforced heat-conducting insulating gasket can better guarantee the adhesion between the silica gel body layer and the silica gel cloth layer and is not easy to separate.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, and in particular to a silicone cloth reinforced thermally conductive insulating gasket and a preparation method thereof. Background Art

[0002] As a typical thermal interface material, silicone thermal pads evenly disperse heat between heat sources and heat sinks, accelerating heat dissipation efficiency. They are widely used in fields such as the three-electric systems of new energy vehicles, communication equipment, and energy storage modules. However, silicone itself has a flexible molecular chain and low intermolecular polarity, resulting in low mechanical strength and poor adhesion. Moreover, when used as a silicone thermal pad, it is inevitable to add a large amount of thermally conductive fillers, which further deteriorates the body strength and adhesion. To address this technical issue, in terms of mechanical strength, single-sided composite reinforcement materials (such as silicone cloth, PI film, and fiberglass cloth) are currently used to improve it, providing puncture and tear resistance. Silicone cloth is the mainstream choice for single-sided composite reinforcement materials due to its low price and mature and stable production. However, the bonding problem between the silicone body layer and the silicone cloth is prominent. In particular, when a large amount of thermally conductive fillers is used to fill the silicone body layer to improve the overall thermal conductivity of the composite material, it is easy for the silicone body layer and the silicone cloth layer to be poorly bonded. During use, there are potential risks such as the silicone cloth delaminating and warping, or the silicone body layer adhering to the heat source when peeled off. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a silicone cloth reinforced thermally conductive insulating gasket and a preparation method thereof.

[0004] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0005] A silicone cloth-reinforced thermally conductive insulating gasket comprises, from bottom to top, a silicone cloth layer and a silicone body layer. The silicone cloth layer is single-sided coated silicone cloth. The single-sided coated silicone cloth used in the present invention is coated with a rubber compound on one side and glass fiber cloth on the other side. Glass fiber itself is rough and polar, which greatly improves its adhesion to the silicone layer.

[0006] The above-mentioned silicone cloth reinforced thermally conductive insulating gasket is preferably formed by compounding the silicone cloth layer with glass fiber cloth as the base material through coating or calendering process.

[0007] The above-mentioned silicone cloth reinforced thermally conductive insulating gasket preferably has a thickness of 0.15 to 0.5 mm.

[0008] The silicone cloth reinforced heat-conducting and insulating gasket is prepared from 100 parts of vinyl silicone oil, 18-35 parts of hydrogen-containing silicone oil, 0.01-0.1 part of polymerization inhibitor, 0.1-1 part of catalyst and 500-1000 parts of heat-conducting and insulating flame-retardant filler.

[0009] Preferably, the silicone cloth reinforced heat-conducting and insulating gasket has a vinyl silicone oil with a viscosity of 50-5000 cps.

[0010] Preferably, the silicone cloth reinforced heat-conducting and insulating gasket has a hydrogen-containing silicone oil including side hydrogen-containing silicone oil and end hydrogen-containing silicone oil, and the amount of the end hydrogen-containing silicone oil is greater than that of the side hydrogen-containing silicone oil. The silicone system formed by the selected hydrogen-containing silicone oil has more side chains, and is easy to form more "tentacles" to anchor the silicone cloth layer, thus having better interlayer adhesion.

[0011] Preferably, the silicone cloth reinforced heat-conducting and insulating gasket has a heat-conducting and insulating flame-retardant filler which is a mixture of heat-conducting and insulating powder and flame-retardant powder, and the mass content of the flame-retardant powder in the heat-conducting and insulating flame-retardant filler is not less than 30%. The heat-conducting and insulating powder is one or more of magnesium oxide, zinc oxide, aluminum oxide, aluminum nitride and boron nitride, and the flame-retardant powder is one or both of magnesium hydroxide and aluminum hydroxide.

[0012] Preferably, the silicone cloth reinforced heat-conducting and insulating gasket has a polymerization inhibitor which is ethynylcyclohexanol, and a catalyst which is platinum-gold complex.

[0013] As a general inventive concept, the application further provides a preparation method of the silicone cloth reinforced heat-conducting and insulating gasket, which comprises the following steps:

[0014] (1) spraying and drying the silane coupling agent diluted on the glass fiber surface of the single-sided coated silicone cloth;

[0015] (2) mixing the vinyl silicone oil, hydrogen-containing silicone oil, polymerization inhibitor and heat-conducting and insulating flame-retardant filler in a mixer, then adding and mixing the catalyst, and then starting a vacuum pump to extract vacuum;

[0016] (3) conveying the liquid mixture after vacuum extraction in step (2) to the PET film on the feeding table of a calender, contacting the glass fiber surface of the single-sided coated silicone cloth treated in step (1) with the liquid mixture, setting the roller gap, and then integrally calendering, high-temperature curing, and cutting or punching into the silicone cloth reinforced heat-conducting and insulating gasket after the curing is completed.

[0017] Preferably, in step (3), the temperature for high-temperature curing is 100-150℃, and the curing time is 10-30 min.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) The silicone cloth layer in the silicone cloth reinforced thermally conductive insulating gasket of the present invention is made of single-sided coated silicone cloth. The rough morphology of the glass fiber in the single-sided silicone cloth is used to increase the bonding "contact points". Compared with the traditional double-sided coated silicone cloth, the silicone cloth layer can better ensure the adhesion between the silicone body layer and the silicone cloth layer, and is not easy to separate.

[0020] (2) The silicone cloth reinforced thermally conductive insulating gasket of the present invention comprises a silicone cloth layer and a silicone body layer. The silicone body layer has strong adhesion. There is no need to select specially modified silicone oil for the silicone body layer. The silicone oil used is ordinary vinyl silicone oil and hydrogen-containing silicone oil. The raw materials are mature and the price is low. Hydrogen-containing silicone oil can be used as a chemical or physical cross-linking agent. The hydrogen-containing silicone oil is mainly end-hydrogen-containing silicone oil, which increases the side chains of the silicone oil network molecules and forms entanglements with the glass fiber "contacts" of the silicone cloth, thereby achieving a good bonding effect.

[0021] (3) During the preparation of the silicone cloth reinforced thermally conductive insulating gasket of the present invention, a silane coupling agent is sprayed on the single-sided silicone cloth to further improve the polarity of the glass fiber surface and further improve its adhesion. There is no need to add an adhesive layer between the silicone cloth and the silicone layer, the process is simple, and the production efficiency is high. DETAILED DESCRIPTION

[0022] In order to facilitate understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0023] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0024] Unless otherwise specified, all reagents and raw materials used in the present invention are commercially available products or products that can be prepared by known methods.

[0025] The vinyl silicone oil used in the following examples and comparative examples has a viscosity of 500 cps, the hydrogen content of the side hydrogen-containing silicone oil is 0.08-0.18%, the hydrogen content of the terminal hydrogen-containing silicone oil is 0.04-0.1%, the polymerization inhibitor is ethynyl cyclohexanol, the catalyst is a platinum complex containing an active platinum concentration of 5000 ppm, and the silica gel cloth is commercially available.

[0026] Example 1:

[0027] The silicone cloth reinforced heat-conducting insulating gasket of the present application comprises, from bottom to top, a silicone cloth layer and a silicone body layer, wherein the silicone body layer is mainly prepared from 100 parts of vinyl silicone oil, 23 parts of hydrogen-containing silicone oil (3 parts of side hydrogen-containing silicone oil and 20 parts of end hydrogen-containing silicone oil), 0.025 parts of polymerization inhibitor, 0.2 parts of catalyst, and 650 parts of heat-conducting insulating flame-retardant filler (aluminum oxide and aluminum hydroxide in a mass ratio of 1:1), and the silicone cloth layer is single-coated silicone cloth with glass fiber cloth as the base material and a thickness of 0.18 mm.

[0028] The preparation method of the silicone cloth reinforced heat-conducting insulating gasket of the present application comprises the following steps:

[0029] (1) Silicone cloth bottom coating: vinyl trimethoxysilane is diluted with ethylene glycol, poured into a sprayer, uniformly sprayed on the glass fiber surface of the single-coated silicone cloth, and then placed in a 80℃ drying oven for 4h, and sealed for storage and use;

[0030] (2) Mixing: add vinyl silicone oil, polymerization inhibitor, hydrogen-containing silicone oil, and heat-conducting insulating flame-retardant filler into a dynamic mixer in the order of mass fraction, mix for 10min, stop stirring, open the cleaning stirrer and dispersion disc to remove the powder; then add the catalyst and mix for 5min, again clean the stirrer and dispersion disc to remove the powder; start the vacuum pump and vacuumize for 10min;

[0031] (3) Calendering and curing: the liquid silicone mixture after vacuumization in step (2) is conveyed to the calendering machine through the pressing equipment pipeline, the width is controlled by the double-sided baffle, the glass fiber surface of the single-coated silicone cloth treated with epoxy functional silane in step (1) is contacted with the liquid mixture, the roller gap is set, and the silicone cloth is integrally calendered and cured in the baking channel at a temperature of 120℃ for 20min;

[0032] (4) Cutting: set the cutting length / specification of the automatic cutting machine, and place the cut pieces neatly.

[0033] Example 2:

[0034] The silicone cloth reinforced heat-conducting insulating gasket of the present application comprises, from bottom to top, a silicone cloth layer and a silicone body layer, wherein the silicone body layer is mainly prepared from 100 parts of vinyl silicone oil, 20 parts of hydrogen-containing silicone oil (5 parts of side hydrogen-containing silicone oil and 15 parts of end hydrogen-containing silicone oil), 0.025 parts of polymerization inhibitor, 0.2 parts of catalyst, and 635 parts of heat-conducting insulating flame-retardant filler (aluminum oxide and aluminum hydroxide in a mass ratio of 1:1), and the silicone cloth layer is single-coated silicone cloth with glass fiber cloth as the base material and a thickness of 0.18 mm.

[0035] The preparation method of the silicone cloth reinforced heat-conducting insulating gasket of the present application comprises the following steps:

[0036] (1) Silicone cloth primer: Dilute vinyl trimethoxysilane with ethylene glycol and pour it into a sprayer. Evenly spray it on the glass fiber surface of the single-sided coated silicone cloth. Then place it in an 80℃ drying oven for 4 hours, seal it and store it for future use.

[0037] (2) Mixing: Add vinyl silicone oil, polymerization inhibitor, hydrogenated silicone oil, and thermally conductive, insulating, and flame-retardant fillers to a power mixer in order of mass fractions, mix for 10 minutes, stop stirring, and clean the stirring paddle and dispersion plate powder; then add the catalyst and mix for 5 minutes, clean the stirring paddle and dispersion plate powder again; start the vacuum pump and evacuate for 10 minutes;

[0038] (3) Calendering and curing: The liquid silicone mixture after vacuuming in step (2) is transported to the PET film on the calender feed table through the pressing equipment pipeline, and the width is controlled by the double-sided baffles. The glass fiber surface of the single-sided coated silicone cloth treated with epoxy functional group silane in step (1) is brought into contact with the liquid mixture, the roller gap is set, and the mixture is calendered as a whole. The mixture is then put into the drying tunnel for high-temperature curing. The drying tunnel temperature is set to 120°C and the curing time is 20 minutes.

[0039] (4) Cutting and discharging: The automatic cutting / punching machine sets the cutting / punching length / specifications, and the discharged sheets are neatly arranged.

[0040] Example 3:

[0041] A silicone cloth reinforced thermally conductive insulating gasket of the present invention comprises, from bottom to top, a silicone cloth layer and a silicone body layer. The silicone body layer is mainly prepared by, in parts by weight, 100 parts of vinyl silicone oil, 23 parts of hydrogen-containing silicone oil (3 parts of side hydrogen-containing silicone oil and 20 parts of end hydrogen-containing silicone oil), 0.025 parts of polymerization inhibitor, 0.2 parts of catalyst, and 860 parts of thermally conductive insulating flame-retardant filler (aluminum oxide and aluminum hydroxide in a mass ratio of 1:1). The silicone cloth layer adopts single-sided coated silicone cloth, the silicone cloth has glass fiber cloth as a base material, and has a thickness of 0.18 mm.

[0042] The method for preparing the silicone cloth reinforced thermally conductive insulating gasket of this embodiment includes the following steps:

[0043] (1) Silicone cloth primer: Dilute KH-560 with ethylene glycol and pour it into a sprayer. Evenly spray it on the glass fiber surface of the single-sided coated silicone cloth. Then place it in an 80℃ drying oven for 4 hours, seal it and store it for future use.

[0044] (2) Mixing: Add vinyl silicone oil, polymerization inhibitor, hydrogenated silicone oil, and thermally conductive, insulating, and flame-retardant fillers to a power mixer in order of mass fractions, mix for 10 minutes, stop stirring, and clean the stirring paddle and dispersion plate powder; then add the catalyst and mix for 5 minutes, clean the stirring paddle and dispersion plate powder again; start the vacuum pump and evacuate for 10 minutes;

[0045] (3) Calendering and curing: The liquid silicone mixture after vacuuming in step (2) is transported to the PET film on the calender feed table through the pressing equipment pipeline, and the width is controlled by the double-sided baffles. The glass fiber surface of the single-sided coated silicone cloth treated with epoxy functional group silane in step (1) is brought into contact with the liquid mixture, the roller gap is set, and the mixture is calendered as a whole. The mixture is then put into the drying tunnel for high-temperature curing. The drying tunnel temperature is set to 120°C and the curing time is 20 minutes.

[0046] (4) Cutting and discharging: The automatic cutting / punching machine sets the cutting / punching length / specifications, and the discharged sheets are neatly arranged.

[0047] Comparative Example 1:

[0048] The silicone cloth reinforced thermally conductive insulating gasket of this comparative example includes a silicone cloth layer and a silicone body layer from bottom to top, wherein the silicone cloth layer is based on glass fiber cloth, has a thickness of 0.23 mm, and adopts double-sided coated silicone cloth. The silicone body layer is mainly composed of 100 parts of vinyl silicone oil, 3 parts of side hydrogen-containing silicone oil, 20 parts of end hydrogen-containing silicone oil, 0.025 parts of inhibitor, 0.2 parts of catalyst, and 650 parts of thermally conductive insulating flame retardant filler (aluminum oxide and aluminum hydroxide with a mass ratio of 1:1).

[0049] The preparation method of the silicone cloth reinforced thermally conductive insulating gasket of this comparative example comprises the following steps:

[0050] (1) Silicone cloth primer: Dilute vinyl trimethoxysilane with ethylene glycol and pour it into a sprayer. Spray it evenly on the surface of the double-sided coated silicone cloth. Then place it in a drying oven at 80°C for 4 hours, seal it and store it for future use.

[0051] (2) Mixing: Add vinyl silicone oil, polymerization inhibitor, hydrogenated silicone oil, epoxy functional silane KH-560, and thermally conductive, insulating, and flame-retardant filler to a power mixer in order of weight, mix for 10 minutes, stop stirring, open and clean the stirring paddle and dispersion plate powder; then add the catalyst and mix for 5 minutes, clean the stirring paddle and dispersion plate powder again; start the vacuum pump and evacuate for 10 minutes;

[0052] (3) Calendering and curing: The liquid silicone mixture after vacuuming in step (2) is transported to the PET film on the calender feed table through the pressing equipment pipeline. The width is controlled by the double-sided baffles. The double-sided coated silicone cloth contacts the liquid silicone mixture. The roller gap is set, and the mixture is calendered in one piece. The mixture is then sent to the drying tunnel for high-temperature curing. The drying tunnel temperature is set at 120°C and the curing time is 20 minutes.

[0053] (4) Cutting and discharging: The automatic cutting / punching machine sets the cutting / punching length / specifications, and the discharged sheets are neatly arranged.

[0054] Comparative Example 2:

[0055] The silicone cloth reinforced thermally conductive insulating gasket of this comparative example includes a silicone cloth layer and a silicone body layer from bottom to top, wherein the silicone cloth layer is based on glass fiber cloth, has a thickness of 0.18 mm, and adopts single-sided coated silicone cloth. The silicone body layer is mainly composed of 100 parts of vinyl silicone oil, 12 parts of side hydrogenated silicone oil, 0.025 parts of polymerization inhibitor, 0.2 parts of catalyst, and 590 parts of thermally conductive insulating flame retardant filler (aluminum oxide and aluminum hydroxide with a mass ratio of 1:1).

[0056] The preparation method of the silicone cloth reinforced thermally conductive insulating gasket of this comparative example comprises the following steps:

[0057] (1) Silicone cloth primer: Dilute vinyl trimethoxysilane with ethylene glycol and pour it into a sprayer. Evenly spray it on the glass fiber surface of the single-sided coated silicone cloth. Then place it in an 80℃ drying oven for 4 hours, seal it and store it for future use.

[0058] (2) Mixing: Add vinyl silicone oil, polymerization inhibitor, hydrogenated silicone oil, and thermally conductive, insulating, and flame-retardant fillers to a power mixer in order of mass fractions, mix for 10 minutes, stop stirring, and clean the stirring paddle and dispersion plate powder; then add the catalyst and mix for 5 minutes, clean the stirring paddle and dispersion plate powder again; start the vacuum pump and evacuate for 10 minutes;

[0059] (3) Calendering and curing: The liquid silicone mixture after vacuuming in step (2) is transported to the PET film on the calender feed table through the pressing equipment pipeline, and the width is controlled by the double-sided baffles. The glass fiber surface of the single-sided coated silicone cloth treated with epoxy functional group silane in step (1) is brought into contact with the liquid mixture, the roller gap is set, and the mixture is calendered as a whole. The mixture is then put into the drying tunnel for high-temperature curing. The drying tunnel temperature is set to 120°C and the curing time is 20 minutes.

[0060] (4) Cutting and discharging: The automatic cutting / punching machine sets the cutting / punching length / specifications, and the discharged sheets are neatly arranged.

[0061] Comparative Example 3:

[0062] The silicone cloth reinforced thermally conductive insulating gasket of this comparative example includes a silicone cloth layer and a silicone body layer from bottom to top, wherein the silicone cloth layer is based on glass fiber cloth, has a thickness of 0.18 mm, and adopts single-sided coated silicone cloth. The silicone body layer is mainly composed of 100 parts of vinyl silicone oil, 3 parts of side hydrogen-containing silicone oil, 20 parts of end hydrogen-containing silicone oil, 0.025 parts of inhibitor, 0.2 parts of catalyst, and 650 parts of thermally conductive insulating flame retardant filler (aluminum oxide and aluminum hydroxide with a mass ratio of 1:1).

[0063] The preparation method of the silicone cloth reinforced thermally conductive insulating gasket of this comparative example comprises the following steps:

[0064] (1)Silicone cloth coating: Ethylene glycol was poured into a sprayer and evenly sprayed on the glass fiber surface of the single-sided coated silicone cloth, then placed in a 80°C drying oven for 4h, sealed and stored for standby;

[0065] (2) Mixing: Add vinyl silicone oil, polymerization inhibitor, hydrogen-containing silicone oil, heat-conducting, insulating and flame-retardant filler into the power mixer according to the mass fraction, mix for 10 min, stop stirring, and clean the stirring paddle and dispersion disc powder. Then add the catalyst and mix for 5 min, and clean the stirring paddle and dispersion disc powder again. Start the vacuum pump and vacuum for 10 min;

[0066] (3) Calendering and curing: The liquid silicone mixture after vacuum in step (2) is conveyed to the calender machine through the pressing equipment pipeline. The PET film is placed on the feeding table of the calender machine, and the width is controlled by the double-sided baffle. The glass fiber surface of the single-sided coated silicone cloth treated with epoxy functional silane in step (1) is contacted with the liquid mixture. The roller gap is set, and the calendering is integrated. The curing is carried out in the baking channel at a temperature of 120°C for 20 min.

[0067] (4) Cutting out: The automatic cutting machine is set to the cutting length / specification, and the pieces are placed neatly.

[0068] The performance test results of the silicone cloth reinforced heat-conducting and insulating gasket prepared in the above examples and comparative examples are shown in Table 1.

[0069] Table 1 Performance of silicone cloth reinforced heat-conducting and insulating gasket prepared in examples and comparative examples

[0070]

[0071] Note: The thickness of the above test samples is 1mm; the heat conductivity test standard is ASTM D5470, the pressure test standard is ASTM D149, the vertical burning test standard is UL 94, and the evaluation method of delamination is to manually pry the silicone layer and the silicone cloth, and then peel along the edge. If the adhesive between the silicone layer and the silicone cloth is damaged, the silicone layer can be completely peeled off, which is complete peeling. If the silicone layer is damaged but the silicone layer and the silicone cloth are partially separated, the adhesive effect is unstable, which is partial peeling.

[0072] The test results in Table 1 demonstrate that, in Examples 1-3, the silicone cloth-reinforced thermally conductive insulating gaskets exhibit excellent adhesion properties through the selection of silicone cloth, adjustment of the side / end hydrogenated silicone oil ratio, and the addition of a silane coupling agent for the primer coating. The single-sided silicone cloth structure features a glass fiber layer on one side without a rubber compound coating, resulting in a rough, uneven surface that provides more bonding points. The hydrogenated silicone oil, with the side hydrogenated silicone oil acting as a crosslinker and the end hydrogenated silicone oil acting as a chain extender, is primarily composed of end hydrogenated silicone oils, resulting in more branched chains and promoting molecular entanglement with the silicone cloth surface, improving adhesion. The silane coupling agent, formulated into a primer, possesses strong polar groups and high activity. One end of the molecular structure is an epoxy group capable of bonding to glass fiber and inorganic fillers, while the other end is compatible with the silicone system of the silicone main layer, forming an organic matrix-epoxy-functional alkylsilane-inorganic matrix bond, improving adhesion between the silicone main layer and the silicone cloth layer. In Comparative Example 1, double-sided silicone cloth was selected, which has a smooth surface and poor self-adhesion; in Comparative Example 2, side hydrogenated silicone oil was mainly used, the cross-linked network was dense, the body strength was high, and the silicone main layer was easy to peel off completely; in Comparative Example 3, no silane coupling agent was added, and the adhesion to the silicone cloth was unstable.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A silicone cloth reinforced thermally conductive insulating gasket, characterized in that: The silicone cloth reinforced thermally conductive insulating gasket comprises a silicone cloth layer and a silicone body layer from bottom to top. The silicone cloth layer adopts a single-sided coated silicone cloth. The silane coupling agent is diluted and sprayed on the glass fiber surface of the single-sided coated silicone cloth, and then dried. The silicone cloth layer is based on glass fiber cloth and is compounded by mixing silicone through coating or calendering process; In parts by weight, the silicone body layer is mainly prepared from 100 parts of vinyl silicone oil, 18 to 35 parts of hydrogen-containing silicone oil, 0.01 to 0.1 parts of polymerization inhibitor, 0.1 to 1 parts of catalyst and 500 to 1000 parts of thermally conductive, insulating and flame-retardant filler. The hydrogen-containing silicone oil includes side hydrogen-containing silicone oil and end hydrogen-containing silicone oil. Among the hydrogen-containing silicone oil, the amount of end hydrogen-containing silicone oil is greater than that of side hydrogen-containing silicone oil.

2. The silicone cloth reinforced thermally conductive insulating gasket according to claim 1, characterized in that: The thickness of the silicone cloth layer is 0.15-0.5 mm.

3. The silicone cloth reinforced thermally conductive insulating gasket according to claim 1, characterized in that: The viscosity of the vinyl silicone oil is 50-5000 cps.

4. The silicone cloth reinforced thermally conductive insulating gasket according to claim 1, characterized in that: The thermally conductive insulating flame retardant filler is a mixture of thermally conductive insulating powder and flame retardant powder, and the mass content of flame retardant powder in the thermally conductive insulating flame retardant filler is not less than 30%; wherein, the thermally conductive insulating powder is one or more of magnesium oxide, zinc oxide, aluminum oxide, aluminum nitride, and boron nitride, and the flame retardant powder is one or two of magnesium hydroxide and aluminum hydroxide.

5. The silicone cloth reinforced thermally conductive insulating gasket according to claim 1, characterized in that: The polymerization inhibitor is ethynyl cyclohexanol, and the catalyst is a platinum complex.

6. A method for preparing a silicone cloth reinforced thermally conductive insulating gasket according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Dilute the silane coupling agent and spray it on the glass fiber surface of the single-sided coated silicone cloth and dry it; (2) Add vinyl silicone oil, hydrogenated silicone oil, polymerization inhibitor, thermally conductive, insulating and flame retardant filler into a mixer and mix them evenly, then add the catalyst and mix them evenly, and start the vacuum pump to evacuate the mixture after mixing evenly; (3) The liquid mixture after vacuuming in step (2) is transported to the PET film on the feeding table of the calender, and the glass fiber side of the single-sided coated silicone cloth treated in step (1) is brought into contact with the liquid mixture. After setting the roller gap, the mixture is calendered as a whole, cured at high temperature, and cut or punched into silicone cloth reinforced thermal insulation gaskets after curing.

7. The preparation method according to claim 6, wherein In step (3), the high temperature curing temperature is 100-150°C, and the curing time is 10-30 minutes.

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