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Silicon dioxide/micro-swelling graphite/graphite composite heat conduction silicone grease and preparation method thereof

A technology of thermally conductive silicone grease and micro-expanded graphite, which is applied in the field of silicon dioxide/micro-expanded graphite/graphite composite thermally conductive silicone grease and its preparation, achieving the effects of good compatibility, simple preparation process, and good interface contact

Inactive Publication Date: 2018-03-02
郴州国盛新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research on the application of micro-expanded graphite in thermally conductive silicone grease materials in the prior art. How to apply micro-expanded graphite in thermally conductive silicone grease materials and exert its excellent thermal conductivity, softness, resilience and plasticity is worthy of our attention. research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The present embodiment provides a kind of preparation method of micro-expanded graphite material, comprises the following steps::

[0037] S11. Get the microcrystalline graphite raw material with carbon content of 70% and the flake graphite raw material with carbon content of 85%, the mass ratio of flake graphite and microcrystalline graphite is 2:1, crushing and grinding, until particle size is 300 purpose mixed graphite powder;

[0038] S12. Place the mixture obtained in S11 in a muffle furnace, slowly heat up to 350° C. under a nitrogen atmosphere, keep it warm for 30 minutes, and air-cool to room temperature for use;

[0039] S13. Perform chemical intercalation treatment on the mixture after S12 heat treatment to obtain expandable mixed graphite, wherein the specific steps of chemical intercalation treatment are as follows: S131. Mix perchloric acid and microcrystalline graphite powder at a liquid-solid ratio of 10:1L / Kg mix and stir evenly; S132. Add strong oxidan...

Embodiment 2

[0042] This embodiment provides a preparation method of silicon dioxide / micro-expanded graphite / graphite composite heat-conducting silicone grease, using the micro-expanded graphite material in Example 1, including the following steps:

[0043] S1. Accurately weigh 5 parts of micro-expanded graphite and 5 parts of graphite, and mix evenly through a high-speed mixer at 1800r / min for 10 minutes to obtain a thermally conductive filler for use;

[0044] S2. Take 200 parts of absolute ethanol in the reaction kettle, take 0.1 part of surface modifier and add it to absolute ethanol, keep the temperature at 60°C, stir at 100r / min for 10min to obtain an ethanol solution, and put the thermally conductive filler in step S1 Added to ethanol solution, ultrasonically stirred for 1h;

[0045]S3. Then add the coupling agent with 3% filler into the reaction kettle, keep the temperature at 60°C, stir at 100r / min for 10min, add 40 parts of silicon dioxide, and stir ultrasonically for 1h. After t...

Embodiment 3

[0049] This embodiment provides a preparation method of silicon dioxide / micro-expanded graphite / graphite composite heat-conducting silicone grease, using the micro-expanded graphite material in Example 1, including the following steps:

[0050] S1. Accurately weigh 15 parts of micro-expanded graphite and 15 parts of graphite, and mix evenly through a high-speed mixer at 3000r / min for 20 minutes to obtain a thermally conductive material for use;

[0051] S2. Take 200 parts of absolute ethanol in the reaction kettle, take 1 part of surface modifier and add it to absolute ethanol, keep the temperature at 100°C, stir at 300r / min for 20min to obtain an ethanol solution, and put the thermally conductive filler in step S1 Add to ethanol solution, ultrasonically stir for 1~2h;

[0052] S3. Then add the coupling agent with 8% filler into the reaction kettle, keep the temperature at 100°C, stir at 300r / min for 20min, add 60 parts of silicon dioxide, and ultrasonically stir for 2h. After...

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Abstract

The invention discloses silicon dioxide / micro-swelling graphite / graphite composite heat conduction silicone grease and a preparation method thereof. The preparation method comprises the following steps of uniformly mixing micro-swelling graphite and graphite by a high-speed mixing machine, so as to obtain heat conduction filler for further use; adding the heat conduction filler into an ethyl alcohol solution, stirring by ultrasonic waves, then adding a coupling agent into a reaction kettle, stirring, then adding silicon dioxide, and enabling the ethyl alcohol to completely evaporate, so as toobtain modified compound heat conduction filler; finally, adding the obtained modified compound heat conduction filler, silicone oil, a crosslinking agent, a surfactant and an antioxidant into an internal mixer to perform banburying, so as to obtain the composite heat conduction silicone grease. The silicon dioxide / micro-swelling graphite / graphite composite heat conduction silicone grease has theadvantages that the surfaces of the micro-swelling graphite and graphite are coated with the surfactant, and the insulation property, heat conduction property, softness, rebound resilience and plasticity are improved at the premises of sufficient utilization of heat conduction property; the heat conduction rate of the silicon dioxide is high, and the sources are wide; by compounding with grapheneand the graphite, the heat conduction silicone grease with high heat conduction coefficient, excellent insulation property, high price-to-performance ratio and wide application range can be prepared.

Description

technical field [0001] The invention relates to a silicon dioxide / micro-expanded graphite / graphite composite heat-conducting silicone grease and a preparation method thereof, which are mainly applicable to the fields of high-power electrical appliance packaging and heat dissipation. Background technique [0002] Thermally conductive silicone grease is a kind of high thermal conductive silicone material, which can maintain the paste shape for a long time at the temperature of -50~300°C. It is widely used between the heating element and the heat dissipation base of high-power electronic components, effectively reducing the interface contact heat. resistance. With the development of high-power and intensive electronic components, there is an increasing demand for high-performance thermally conductive silicone grease with high thermal conductivity, excellent thermal stability, and low oil separation value. [0003] Micro-expanded graphite is a kind of graphite interlayer compou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K13/06C08K9/10C08K9/06C08K7/24C08K3/04C08K3/36C08K5/14C09K5/14
CPCC08L83/04C08L2205/025C08L2205/03C08L2312/00C09K5/14C08K13/06C08K9/10C08K9/06C08K7/24C08K3/04C08K3/36C08K5/14
Inventor 李丽萍
Owner 郴州国盛新材科技有限公司
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