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Carbon nanotube/micro-expansion graphite composite heat-conducting silicone grease and preparation method thereof

A technology of thermal conductive silicone grease and micro-expanded graphite, which is applied in the field of carbon nanotube/micro-expanded graphite composite thermal conductive silicone grease and its preparation, and achieves the effects of simple preparation process, good interface contact and large reserves

Inactive Publication Date: 2018-02-23
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

[0033] The present embodiment provides a kind of preparation method of micro-expanded graphite material, comprises the following steps:

[0034] 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;

[0035] 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;

[0036] 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 oxidant...

Embodiment 2

[0039] This embodiment provides a method for preparing a carbon nanotube / micro-expanded graphite composite heat-conducting silicone grease, using the micro-expanded graphite material in Example 1.

[0040] S1. Immerse the micro-expanded graphite in the ferric nitrate aqueous solution, filter it after ultrasonic vibration for a certain period of time, and dry it in vacuum. Put the dried material in the furnace, raise the temperature to 650°C under the protective gas atmosphere, and then pass in C2H2 gas to keep it warm 40min, then cooled to room temperature under a protective gas atmosphere to obtain a carbon nanotube / micro-expanded graphite composite material for subsequent use;

[0041] S2. Take 400 parts of absolute ethanol and put it into the reaction kettle, take 3% coupling agent of thermally conductive filler and add it into the reaction kettle, and stir at a constant temperature of 60°C and 100r / min for 10min to obtain an ethanol solution;

[0042] S3. Add the composite...

Embodiment 3

[0046] This embodiment provides a method for preparing a carbon nanotube / micro-expanded graphite composite heat-conducting silicone grease, using the micro-expanded graphite material in Example 1.

[0047]S1. Immerse the micro-expanded graphite in the ferric nitrate aqueous solution, filter it after ultrasonic vibration for a certain period of time, and dry it in vacuum. Put the dried material in the furnace, raise the temperature to 700°C under the protective gas atmosphere, and then pass in C2H2 gas to keep it warm 50min, then cooled to room temperature under a protective gas atmosphere to obtain a carbon nanotube / micro-expanded graphite composite material for subsequent use;

[0048] S2. Put 400 parts of absolute ethanol into the reactor, take 8% coupling agent of thermally conductive filler and add it into the reactor, stir at a constant temperature of 100°C and 300r / min for 30min to obtain an ethanol solution;

[0049] S3. Add the composite material in step S1 into the et...

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Abstract

The invention discloses carbon nanotube / micro-expansion graphite composite heat-conducting silicone grease and a preparation method thereof. The preparation comprises the following steps: firstly preparing a carbon nanotube / micro-expansion graphite composite material, adding to an ethanol solution, and carrying out ultrasonic stirring until ethanol is completely evaporated, so as to obtain a modified compound heat-conducting filling; and adding the heat-conducting filling, methyl phenyl silicone oil, a crosslinking agent, a structure improver and an antioxidant into an internal mixer, carryingout internal mixing, so as to obtain the composite heat-conducting silicone grease. The prepared heat-conducting silicone grease has excellent thermal stability, is low in oil separation value and does not crack and atomize after being used for a long time. Meanwhile, a preparation process is simple and short in cycle and has important significance to the improvement of the quality in industry products.

Description

technical field [0001] The invention relates to a carbon nanotube / micro-expanded graphite composite heat-conducting silicone grease and a preparation method thereof, which are mainly applicable to the fields of encapsulation and heat dissipation of high-power electronic components. 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 compoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K7/24C08K9/06C08K7/00C08K13/06C08K5/14C08K3/36C08K5/18C09K5/14
CPCC08K3/36C08K5/14C08K5/18C08K7/00C08K7/24C08K9/06C08K9/12C08K13/06C08K2201/011C08K2201/014C08L83/04C08L2203/20C09K5/14
Inventor 李丽萍
Owner 郴州国盛新材科技有限公司
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