High-thermal-conductivity flame-retardant organic silicon gasket and preparation method thereof

Abstract

The invention discloses a high-heat-conductivity flame-retardant organic silicon gasket and a preparation method thereof, and relates to the technical field of heat-conducting materials. The preparation method comprises the following steps: firstly, forming a polyacrylamide organic layer on the surface of expanded graphite, then growing aluminum oxide on amino active sites on the polyacrylamide organic layer in situ to prepare the core-shell material, and forming coordinate bonds by amino of acrylamide and aluminum ions in aluminum alkoxide, so that nucleation and growth of aluminum oxide on the surface of polyacrylamide are promoted, and the core-shell material is prepared. The preparation method comprises the following steps: adding aluminum oxide into a base material, so that the aluminum oxide can be tightly attached to the surface of polyacrylamide, the agglomeration of the aluminum oxide in the base material is reduced, adding heat-conducting powder into the base material, and pressing to prepare the high-heat-conductivity flame-retardant organic silicon wafer. The expanded graphite is added into the organic silicon gasket, tiny holes in the gasket can be filled, the sealing effect is improved, the microstructure of the material can be further optimized through aluminum oxide, the surface of the gasket is smoother and more compact, and therefore the sealing performance is improved. The prepared high-thermal-conductivity flame-retardant organic silicon wafer has the effects of high thermal conductivity, flame retardance and good sealing performance.

Description

Technical Field

[0001] The invention relates to the technical field of thermal conductive materials, and in particular to a high thermal conductive flame retardant organic silicon gasket and a preparation method thereof. Background Art

[0002] With the development of science and technology, electronic components are becoming more and more dense and miniaturized, which puts higher requirements on the stability of electronic components. The reliability and performance of electronic products depend to a large extent on whether the heat dissipation materials and heat dissipation solutions used are reasonable. Statistics show that for every 2°C increase in the temperature of electronic components, their reliability decreases by 10%, and the life of electronic components will double when the temperature decreases by 8°C. Therefore, thermal interface materials play an increasingly important role in the field of information technology.

[0003] Thermally conductive flame retardant gasket is a composite material formed by mixing powdered thermal conductive powder and resin matrix. Its thermal conductivity is mainly determined by the thermal conductivity and filling amount of the powdered thermal conductive powder. Silicone resin is a special synthetic resin with a highly cross-linked three-dimensional network structure. Due to the special structure, it has excellent heat resistance, cold resistance, weather resistance, electrical insulation, hydrophobicity and anti-sticking demoulding properties, and its heat resistance and waterproof effects are particularly outstanding.

[0004] Currently, thermally conductive powders have the characteristics of large specific surface area, high surface energy and high surface activity, so how to use them better is a difficult problem currently faced. When the thermally conductive powder is added to the resin matrix and mixed, the viscosity of the mixture will increase dramatically, causing mixing difficulties, and thus it is impossible to fill a sufficient amount of thermally conductive powder into the resin matrix. In addition, the thermally conductive powder in the prior art is prone to agglomeration, and it is difficult to evenly disperse it into the resin matrix, and it is impossible to form a sufficient contact interface with the resin matrix. In addition, there is an interfacial thermal resistance between the thermally conductive powder and the particles of the metal-based thermally conductive filler, which will also affect its thermal conductivity, and it does not have a flame retardant function.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The object of the present invention is to provide a highly thermally conductive flame-retardant organic silicon gasket and a preparation method thereof, so as to solve the problems existing in the prior art.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a high thermal conductivity flame retardant silicone gasket, wherein the high thermal conductivity flame retardant silicone gasket is prepared by adding a self-made thermal conductive powder composed of expanded graphite-polyacrylamine-alumina into a base material.

[0008] Furthermore, the self-made thermally conductive powder is prepared by first coating a polyacrylamine organic layer on the surface of expanded graphite and then in-situ growing aluminum oxide on the organic layer.

[0009] Furthermore, the base material is prepared from low-viscosity vinyl silicone oil, high-viscosity vinyl silicone oil, hydrogen-containing silicone oil, organic silicone resin, a catalyst and an inhibitor.

[0010] Furthermore, a method for preparing a highly thermally conductive flame-retardant silicone gasket comprises the following preparation steps:

[0011] (1) Activated expanded graphite and acrylamine are mixed in a mass ratio of 1:8-12, added to 35wt% ethanol with a mass of 15-20 times that of the activated expanded graphite, stirred at 200-300r / min for 30-35min, potassium persulfate with a mass of 0.8-1.1 times that of the acrylamine is added, aluminum isopropoxide with a mass of 4-5 times that of the activated expanded graphite is added, stirred at 200-250r / min for 8-10min to obtain a mixture, 20wt% dilute hydrochloric acid is added to adjust the pH to 3-4, the mixture is heated to 50-60°C, reacted for 10-15h, sodium bisulfite solution with a mass of 0.1-0.3 times that of the acrylamine is added, placed in an autoclave, reacted for 30-45min, filtered to obtain a solid, washed with deionized water 2-3 times, and washed with anhydrous ethanol 2-3 times to obtain a self-made thermal conductive powder;

[0012] (2) Low viscosity vinyl silicone oil, high viscosity vinyl silicone oil, hydrogen-containing silicone oil, and silicone resin are mixed in a mass ratio of 16-20:1.3-1.5:1.0-1.1:1 and placed in a vacuum mixer, and a catalyst of 0.2-0.3 times the mass of the silicone resin and an inhibitor of 0.2-0.3 times the mass of the silicone resin are added, and the mixture is stirred at 800-850 r / min for 30-45 min, and then a self-made thermal conductive powder of 6-8 times the mass of the silicone resin is added, and the mixture is stirred at 800-850 r / min for 30-45 min to obtain a mixed material, and the mixed material is calendered, cured, and cut to obtain a high thermal conductive flame-retardant silicone gasket.

[0013] Furthermore, the activated expanded graphite in step (1) is prepared by soaking expanded graphite with a particle size of 80 to 100 μm in 80 wt % concentrated sulfuric acid for 3 to 5 min at a solid-liquid ratio of 1:5, and then taking it out and washing it with deionized water until the pH is neutral.

[0014] Furthermore, the reaction conditions of the autoclave in step (1) are: pressure of 10-20 MPa, heating rate of 10°C / min, and temperature of 200°C.

[0015] Furthermore, in step (2), the viscosity of the low-viscosity vinyl silicone oil is 200-1000 mPa·s, the viscosity of the high-viscosity vinyl silicone oil is 5000-5500 mPa·s, and the viscosity of the hydrogenated silicone oil is 50-80 mPa·s. 2 / s, the organic silicone resin is vinyl MQ silicone resin.

[0016] Furthermore, the pressure of the vacuum mixer in step (2) is -0.5 to -0.2 MPa.

[0017] Furthermore, in the step (2), the catalyst is a KE-808 platinum catalyst, and the inhibitor is ethynyl cyclohexanol.

[0018] Furthermore, the curing process in step (2) is to heat the mixture to 125-130° C. and cure the mixture for 35-40 minutes.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] The high thermal conductivity flame retardant organic silicon sheet prepared by the present invention adds a thermal conductive powder composed of expanded graphite-polyacrylamine-alumina into the base material, which effectively improves the flame retardancy and sealing effect of the organic silicon gasket while achieving high thermal conductivity, thereby forming a multifunctional high thermal conductivity flame retardant organic silicon sheet.

[0021] Firstly, an organic layer of polyacrylamine is formed on the surface of expanded graphite. After being coated with polyacrylamine, the mechanical properties and dispersibility of expanded graphite can be improved, and heat can be transferred more evenly, thereby improving the overall thermal conductivity and flame retardant effect of the silicone gasket. Then, alumina is in situ grown on the amino active sites on the organic layer of polyacrylamine to obtain a core-shell material. The amino groups of acrylamine will form coordination bonds with aluminum ions in aluminum alkoxide, which promotes the nucleation and growth of alumina on the surface of polyacrylamine. This coordination effect provides a stable binding site for the deposition of alumina, so that alumina can be tightly attached to the surface of polyacrylamine, reducing the agglomeration of alumina in the base material, and further improving the thermal conductivity and flame retardant effect of the silicone gasket.

[0022] Secondly, thermal conductive powder is added to the base material and pressed into a highly thermally conductive flame-retardant silicone sheet. Adding expanded graphite to the silicone gasket can fill the tiny pores in the gasket and improve the sealing effect. Alumina will further optimize the microstructure of the material, making the gasket surface smoother and denser, thereby improving the sealing performance. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of the high thermal conductivity flame retardant silicone gasket prepared in the following examples are as follows:

[0025] Thermal conductivity: The thermal conductivity of the highly thermally conductive flame-retardant silicone gaskets prepared in the embodiment and the comparative example of the same mass was tested in accordance with ISO-22007-2 "Plastics. Determination of thermal conductivity and thermal diffusivity".

[0026] Flame retardant properties: The flame retardant properties of the high thermal conductive flame retardant silicone gaskets prepared in the embodiment and the comparative example of the same mass were evaluated by two 10-second burning tests according to the UL94 plastic material flammability standard.

[0027] Sealing performance: The high thermal conductive flame retardant silicone gaskets prepared in the embodiment and the comparative example of the same mass were tested for their sealing performance according to ASTM F37-06 “Standard Test Method for Sealing of Gasket Materials”.

[0028] Example 1

[0029] A method for preparing a highly thermally conductive flame-retardant silicone gasket comprises the following steps:

[0030] (1) soaking expanded graphite with a particle size of 80 μm in 80 wt % concentrated sulfuric acid for 3 min with a solid-liquid ratio of 1:5, taking it out and washing it with deionized water until the pH is neutral to obtain activated expanded graphite;

[0031] (2) Activated expanded graphite and acrylamine were mixed in a mass ratio of 1:8, added to 35wt% ethanol with a mass of 15 times that of the activated expanded graphite, stirred at 200r / min for 30min, potassium persulfate with a mass of 0.8 times that of the acrylamine was added, aluminum isopropoxide with a mass of 4 times that of the activated expanded graphite was added, stirred at 200r / min for 8min to obtain a mixture, 20wt% dilute hydrochloric acid was added to adjust the pH to 3, the mixture was heated to 50°C, reacted for 10h, sodium bisulfite solution with a mass of 0.1 times that of the acrylamine was added, placed in an autoclave, the pressure was 10MPa, the heating rate was 10°C / min, the temperature was 200°C, the reaction was carried out for 30min, the solid was filtered out, washed twice with deionized water, and washed twice with anhydrous ethanol to obtain a self-made thermal conductive powder;

[0032] (3) Low viscosity vinyl silicone oil with a viscosity of 200 mPa·s, high viscosity vinyl silicone oil with a viscosity of 5000 mPa·s, and high viscosity vinyl silicone oil with a viscosity of 50 mm 2 / s hydrogen-containing silicone oil and vinyl MQ silicone resin in a mass ratio of 16:1.3:1.0:1 were mixed and placed in a vacuum mixer at a pressure of -0.5MPa, KE-808 platinum catalyst 0.2 times the mass of the silicone resin and ethynyl cyclohexanol inhibitor 0.2 times the mass of the silicone resin were added, and the mixture was stirred at 800r / min for 30min, and then homemade thermal conductive powder 6 times the mass of the silicone resin was added, and the mixture was stirred at 800r / min for 30min to obtain a mixed material, which was calendered, heated to 125°C, cured for 35min, and cut to obtain a high thermal conductive flame-retardant silicone gasket.

[0033] Example 2

[0034] A method for preparing a highly thermally conductive flame-retardant silicone gasket comprises the following steps:

[0035] (1) soaking expanded graphite with a particle size of 90 μm in 80 wt % concentrated sulfuric acid for 4 min with a solid-liquid ratio of 1:5, taking it out and washing it with deionized water until the pH is neutral to obtain activated expanded graphite;

[0036] (2) The activated expanded graphite and acrylamine were mixed in a mass ratio of 1:10, added to 35wt% ethanol with a mass of 17 times that of the activated expanded graphite, stirred at 250r / min for 33min, potassium persulfate with a mass of 1.0 times that of the acrylamine was added, aluminum isopropoxide with a mass of 4 times that of the activated expanded graphite was added, stirred at 230r / min for 9min to obtain a mixture, 20wt% dilute hydrochloric acid was added to adjust the pH to 4, the mixture was heated to 55°C, reacted for 13h, sodium bisulfite solution with a mass of 0.2 times that of the acrylamine was added, placed in an autoclave, the pressure was 15MPa, the heating rate was 10°C / min, the temperature was 200°C, the reaction was carried out for 40min, the solid was filtered out, washed twice with deionized water, and washed three times with anhydrous ethanol to obtain a self-made thermal conductive powder;

[0037] (3) Low viscosity vinyl silicone oil with a viscosity of 600 mPa·s, high viscosity vinyl silicone oil with a viscosity of 5200 mPa·s, and high viscosity vinyl silicone oil with a viscosity of 65 mm 2 / s hydrogen-containing silicone oil and vinyl MQ silicone resin in a mass ratio of 18:1.4:1:1 were mixed and placed in a vacuum mixer at a pressure of -0.3MPa, KE-808 platinum catalyst 0.2 times the mass of the silicone resin and ethynyl cyclohexanol inhibitor 0.2 times the mass of the silicone resin were added, and the mixture was stirred at 830r / min for 40min, and then homemade thermal conductive powder 7 times the mass of the silicone resin was added, and the mixture was stirred at 830r / min for 40min, the mixed material was calendered, heated to 128°C, cured for 38min, and cut to obtain high thermal conductive flame-retardant silicone gasket.

[0038] Example 3

[0039] A method for preparing a highly thermally conductive flame-retardant silicone gasket comprises the following steps:

[0040] (1) soaking expanded graphite with a particle size of 100 μm in 80 wt % concentrated sulfuric acid for 5 min with a solid-liquid ratio of 1:5, taking it out and washing it with deionized water until the pH is neutral to obtain activated expanded graphite;

[0041] (2) Activated expanded graphite and acrylamine were mixed in a mass ratio of 1:12, added to 35wt% ethanol with a mass of 20 times that of the activated expanded graphite, stirred at 300r / min for 35min, potassium persulfate with a mass of 1.1 times that of the acrylamine was added, aluminum isopropoxide with a mass of 5 times that of the activated expanded graphite was added, stirred at 250r / min for 10min to obtain a mixture, 20wt% dilute hydrochloric acid was added to adjust the pH to 4, the mixture was heated to 60°C, reacted for 15h, sodium bisulfite solution with a mass of 0.3 times that of the acrylamine was added, placed in an autoclave, the pressure was 20MPa, the heating rate was 10°C / min, the temperature was 200°C, the reaction was carried out for 45min, the solid was filtered out, washed 3 times with deionized water, and washed 3 times with anhydrous ethanol to obtain a self-made thermal conductive powder;

[0042] (3) Low viscosity vinyl silicone oil with a viscosity of 1000 mPa·s, high viscosity vinyl silicone oil with a viscosity of 5500 mPa·s, and high viscosity vinyl silicone oil with a viscosity of 80 mm 2 / s hydrogen-containing silicone oil and vinyl MQ silicone resin in a mass ratio of 20:1.5:1.1:1 were mixed and placed in a vacuum mixer at a pressure of -0.2MPa, and 0.3 times the mass of the silicone resin KE-808 platinum catalyst and 0.3 times the mass of the silicone resin ethynyl cyclohexanol inhibitor were added, stirred at 850r / min for 45min, and then 8 times the mass of the silicone resin homemade thermal conductive powder was added, stirred at 850r / min for 45min to obtain a mixed material, calendered the mixed material, heated to 130°C, cured for 40min, and cut to obtain a high thermal conductive flame-retardant silicone gasket.

[0043] Comparative Example 1

[0044] The difference between Comparative Example 1 and Example 2 is that step (2) is different. Step (2) is changed to: adding activated expanded graphite to anhydrous ethanol with a mass of 17 times that of the activated expanded graphite, adding aluminum isopropoxide with a mass of 4 times that of the activated expanded graphite, stirring the mixture at 230 r / min for 9 min, adding 20wt% dilute hydrochloric acid to adjust the pH to 4, placing the mixture in an autoclave at a pressure of 15 MPa, a heating rate of 10°C / min, a temperature of 200°C, reacting for 40 min, filtering the solid, washing it with deionized water twice, and washing it with anhydrous ethanol three times to obtain a self-made thermally conductive powder; and the remaining steps are the same as those in Example 2.

[0045] Comparative Example 2

[0046] The difference between Comparative Example 2 and Example 2 is that there is no step (1) and step (2), and step (3) is changed to: low viscosity vinyl silicone oil with a viscosity of 600mPa·s, high viscosity vinyl silicone oil with a viscosity of 5200mPa·s, hydrogen-containing silicone oil with a viscosity of 65mm2 / s, and vinyl MQ silicone resin are mixed in a mass ratio of 18:1.4:1:1 and placed in a vacuum mixer with a pressure of -0.3MPa, KE-808 platinum catalyst 0.2 times the mass of silicone resin and ethynyl cyclohexanol inhibitor 0.2 times the mass of silicone resin are added, and stirred at 830r / min for 40min, and then alumina powder with a particle size of 90μm 7 times the mass of silicone resin is added, and stirred at 830r / min for 40min to obtain a mixed material, the mixed material is calendered, the temperature is raised to 128°C, cured for 38min, and cut to obtain a high thermal conductive flame retardant silicone gasket; the remaining steps are the same as Example 2.

[0047] Comparative Example 3

[0048] The difference between Comparative Example 3 and Example 2 is that step (2) is different. Step (2) is changed to: activated expanded graphite and acrylamine are mixed in a mass ratio of 1:10, added to 35wt% ethanol with a mass of 17 times that of the activated expanded graphite, stirred at 250r / min for 33min, potassium persulfate with a mass of 1.0 times that of acrylamine is added, and stirred at 230r / min for 9min to obtain a mixture, heated to 55°C, reacted for 13h, filtered to obtain a solid, washed twice with deionized water, and washed three times with anhydrous ethanol to obtain a self-made thermally conductive powder; the remaining steps are the same as those in Example 2.

[0049] Effect example

[0050] Table 1 below shows the performance analysis results of the high thermal conductive flame retardant silicone gaskets of Examples 1 to 3 of the present invention and Comparative Examples 1 to 4.

[0051] Table 1

[0052] Thermal conductivity (w / mk) Flame retardant grade UL94 (mmV-0) Leakage rate (mL / h) Example 1 7.7 0.6 ≤2 Example 2 7.8 0.6 ≤2 Example 3 7.8 0.6 ≤2 Comparative Example 1 4.6 1.2 ≤3 Comparative Example 2 4.9 1.3 ≤3 Comparative Example 3 3.4 2.0 ≤3

[0053] Table 1 From the comparison of the experimental data of the embodiment and the comparative example, it can be found that the present invention forms an organic layer of polyacrylamine on the surface of expanded graphite, and the mechanical properties and dispersibility of the expanded graphite can be improved after the polyacrylamine is coated, so that the heat is transferred more evenly, thereby improving the overall thermal conductivity and flame retardant effect of the silicone gasket; then, alumina is in situ grown on the amino active sites on the organic layer of polyacrylamine to obtain a homemade thermally conductive powder, and the amino groups of acrylamine will form coordination bonds with the aluminum ions in the aluminum alkoxide, which promotes the nucleation and growth of alumina on the surface of polyacrylamine. This coordination provides a stable binding site for the deposition of alumina, so that alumina can be tightly attached to the surface of polyacrylamine, reducing the agglomeration of alumina in the base material, further improving the thermal conductivity and flame retardant effect of the silicone gasket, and adding the thermally conductive powder to the base material, pressing it into a high thermal conductivity and flame retardant silicone sheet; the addition of expanded graphite can fill the tiny pores in the gasket and improve the sealing effect, and alumina will further optimize the microstructure of the material, making the gasket surface smoother and denser, thereby improving the sealing performance.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A highly thermally conductive flame-retardant silicone gasket, characterized in that: The high thermal conductivity flame retardant organic silicon gasket is prepared by adding a self-made thermal conductive powder composed of expanded graphite, polyacrylamine and aluminum oxide into a base material.

2. The high thermal conductivity flame retardant organic silicon gasket according to claim 1, characterized in that: The self-made thermal conductive powder is prepared by first coating a polyacrylamine organic layer on the surface of expanded graphite and then in-situ growing aluminum oxide on the organic layer.

3. The high thermal conductivity flame retardant organic silicon gasket according to claim 2, characterized in that: The base material is prepared from low-viscosity vinyl silicone oil, high-viscosity vinyl silicone oil, hydrogen-containing silicone oil, organic silicone resin, a catalyst and an inhibitor.

4. A method for preparing a highly thermally conductive flame-retardant silicone gasket, characterized in that: The method comprises the following preparation steps: (1) Activated expanded graphite and acrylamine were mixed in a mass ratio of 1:8-12, added to 35wt% ethanol with a mass of 15-20 times that of the activated expanded graphite, stirred at 200-300r / min for 30-35min, potassium persulfate with a mass of 0.8-1.1 times that of the acrylamine was added, aluminum isopropoxide with a mass of 4-5 times that of the activated expanded graphite was added, stirred at 200-250r / min for 8-10min to obtain a mixture, 20wt% dilute hydrochloric acid was added to adjust the pH to 3-4, the mixture was heated to 50-60°C, reacted for 10-15h, sodium bisulfite solution with a mass of 0.1-0.3 times that of the acrylamine was added, placed in an autoclave, reacted for 30-45min, the solid was filtered out, washed with deionized water 2-3 times, and washed with anhydrous ethanol 2-3 times to obtain a self-made thermal conductive powder; (2) Low viscosity vinyl silicone oil, high viscosity vinyl silicone oil, hydrogen-containing silicone oil and silicone resin are mixed in a mass ratio of 16-20:1.3-1.5:1.0-1.1:1 and placed in a vacuum mixer. A catalyst in an amount of 0.2-0.3 times the mass of the silicone resin and an inhibitor in an amount of 0.2-0.3 times the mass of the silicone resin are added, and the mixture is stirred at 800-850 r / min for 30-45 min. Then, a homemade thermal conductive powder in an amount of 6-8 times the mass of the silicone resin is added, and the mixture is stirred at 800-850 r / min for 30-45 min to obtain a mixed material. The mixed material is calendered, cured and cut to obtain a high thermal conductive flame-retardant silicone gasket.

5. The method for preparing a highly thermally conductive flame-retardant organic silicon gasket according to claim 4, characterized in that: The activated expanded graphite in step (1) is prepared by soaking expanded graphite with a particle size of 80-100 μm in 80 wt % concentrated sulfuric acid for 3-5 min with a solid-liquid ratio of 1:5, and then taking it out and washing it with deionized water until the pH is neutral.

6. The method for preparing a highly thermally conductive flame-retardant organic silicon gasket according to claim 4, characterized in that: The reaction conditions of the autoclave in step (1) are: pressure of 10-20 MPa, heating rate of 10°C / min, and temperature of 200°C.

7. The method for preparing a highly thermally conductive flame-retardant organic silicon gasket according to claim 4, characterized in that: The viscosity of the low-viscosity vinyl silicone oil in step (2) is 200-1000 mPa·s, the viscosity of the high-viscosity vinyl silicone oil is 5000-5500 mPa·s, and the viscosity of the hydrogen-containing silicone oil is 50-80 mPa·s. 2 / s, the organic silicone resin is vinyl MQ silicone resin.

8. The method for preparing a highly thermally conductive flame-retardant organic silicon gasket according to claim 4, characterized in that: The pressure of the vacuum mixer in step (2) is -0.5 to -0.2 MPa.

9. The method for preparing a highly thermally conductive flame-retardant organic silicon gasket according to claim 4, characterized in that: In the step (2), the catalyst is KE-808 platinum catalyst, and the inhibitor is ethynyl cyclohexanol.

10. The method for preparing a highly thermally conductive flame-retardant organic silicon gasket according to claim 4, characterized in that: The curing process in step (2) is to heat the mixture to 125-130° C. and cure for 35-40 minutes.