Compressed expanded graphite thermal conductive composite material, and preparation method thereof

A technology of compression expansion and graphite heat conduction, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of compression and expansion graphite heat conduction network damage, affecting heat conduction performance, etc., to improve heat conduction performance, excellent performance, protection and heat conduction performance effect

Active Publication Date: 2017-03-22
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, during the impregnation process, due to the fluidity of the liquid, especially the polymer with a large molecular weight, it will break the overlap between the graphite sheet and the graphite sheet, so it will cause certain damage to the heat conduction network of the compressed and expanded graphite. Affect thermal conductivity

Method used

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  • Compressed expanded graphite thermal conductive composite material, and preparation method thereof

Examples

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Embodiment 1

[0048] A thermally conductive composite material of compressed and expanded graphite, comprising compressed and expanded graphite, phenolic resin and silicon rubber, the volume percentage of the silicone rubber is 36%, the volume percentage of the compressed and expanded graphite is 59%, and the phenolic The volume percentage of resin is 5%.

[0049] see figure 1 , a method for preparing a thermally conductive composite material of compressed expanded graphite, comprising the steps of:

[0050] S1, preparing compressed expanded graphite;

[0051] The graphite was oxidized by strong acid intercalation, and then expanded in a microwave oven for 20 seconds to obtain expanded graphite.

[0052] The expanded graphite is weighed, and the expanded graphite is compressed by unidirectional pressure in a mold to obtain compressed expanded graphite. The density of compressed expanded graphite described in the present embodiment is 0.1g / cm 3 . The compressed expanded graphite include...

Embodiment 2

[0061] A kind of compressed expanded graphite heat-conducting composite material, comprising compressed expanded graphite, phenolic resin and paraffin, the volume percent of described paraffin is 94.9%, the volume percent of described compressed expanded graphite is 5%, the phenolic resin The volume percentage is 0.1%.

[0062] The preparation method of the thermally conductive composite material of compressed expanded graphite includes the following steps: put the expanded graphite into a beaker, heat it in a high-temperature furnace at 800°C for 30s to expand the graphite into expanded graphite, weigh an appropriate amount of expanded graphite powder with a balance and put it in a stainless steel mold , unidirectionally compress and expand graphite to obtain a density of 0.05g / cm 3 compressed expanded graphite.

[0063] Place the compression-expandable graphite above the cresol and acetaldehyde, and heat it to 60°C. The cresol and acetaldehyde will be heated to evaporate cr...

Embodiment 3

[0066] A thermally conductive composite material of compressed and expanded graphite, comprising compressed and expanded graphite, phenolic resin and epoxy resin, the volume percentage of the epoxy resin is 73%, and the volume percentage of the compressed and expanded graphite is 25%, so The volume percentage of the phenolic resin is 2%.

[0067] The preparation method of the above-mentioned heat-conducting composite material of compressed expanded graphite comprises the following steps: put the expanded graphite in a beaker, heat it in a microwave oven for 10 seconds to expand the graphite into expanded graphite, weigh an appropriate amount of expanded graphite powder with a balance and put it in a stainless steel mould, Expand graphite towards compression to obtain a density of 0.5g / cm 3 compressed expanded graphite.

[0068] Put the compressed expanded graphite above the xylenol and furfural and heat it to 70°C. The xylenol and furfural are heated to evaporate cresol vapor...

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Abstract

The invention provides a compressed expanded graphite thermal conductive composite material, and a preparation method thereof. The compressed expanded graphite thermal conductive composite material comprises compressed expanded graphite, phenolic resin, and an organic filler. The compressed expanded graphite thermal conductive composite material possesses excellent thermal conductive performance.

Description

technical field [0001] The invention relates to the field of preparation of graphite composite materials, in particular to a compression-expanded graphite heat-conducting composite material and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of industry, especially the rise of the electronic field and the emergence of a large number of high-power devices, the problem of heat dissipation and heat transfer has become a bottleneck that limits the further improvement and optimization of these products. In many fields, metals have been used as the main material for thermal management due to their high heat transfer efficiency, but for metals, polymer materials have more excellent properties, such as low density, stronger oxidation resistance, Corrosion resistance and higher processing performance. However, most polymer materials are poor conductors of heat, so the development of high thermal conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L91/06C08L63/00C08L61/06C08K7/24C08K3/04C09K5/14
CPCC08L63/00C08L83/04C08L91/06C09K5/14C08L61/06C08K7/24C08K3/04
Inventor 杜鸿达陈威李邦硕干林李佳徐成俊褚晓东姚有为李宝华杨全红贺艳兵康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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