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Preparation method of graphene composite with high thermal conductivity

A technology of high thermal conductivity graphite and composite materials, which is applied in the field of preparation of high thermal conductivity graphene composite materials, can solve the problems of large amount of thermal conductive fillers and difficulty in forming thermal conduction paths, and achieve low equipment requirements, increased thermal conduction paths, and increased thermal conductivity. Effect

Active Publication Date: 2019-07-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a high thermal conductivity graphene composite material, which has simple preparation process, high efficiency, no need for vacuum, easy operation, and solves the problem of large amount of thermal conductive filler added in the polymer matrix and difficulty in forming a complete thermal conductivity access problem

Method used

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  • Preparation method of graphene composite with high thermal conductivity

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Effect test

Embodiment 1

[0035] In the present embodiment, the preparation method of high thermal conductivity graphene composite material is as follows:

[0036]Take 80-150ml of toluene solvent and dissolve 3g of natural rubber under the condition of heating and stirring, the temperature is 40°C, the magnetic stirring rate is 300r / min, and the stirring time is 6h to form a natural rubber solution. Take 300-600 mg of graphene nanosheets, and disperse the graphene nanosheets in 60 ml of toluene by ultrasonic waves to form a graphene nanosheet dispersion. Add the graphene nanosheet dispersion into the natural rubber solution, heat and stir to obtain the graphene nanosheet / natural rubber dispersion, and add 0.03g stearic acid, 0.15g sulfur, 0.006g DM and 0.09g zinc oxide successively. The temperature is 60°C, the stirring rate is 800r / min, and the time is 12h.

[0037] Get 30ml graphene nanosheet / natural rubber dispersion and pour into the PTFE mold that three-dimensional graphene foam is housed, utiliz...

Embodiment 2

[0043] In the present embodiment, the preparation method of high thermal conductivity graphene composite material is as follows:

[0044] Take 90ml of toluene solvent and dissolve 3g of natural rubber under the condition of heating and stirring, the temperature is 40°C, the magnetic stirring rate is 200r / min, and the stirring time is 8h to form a natural rubber solution. Get 400mg of graphene nanosheets, and disperse the graphene nanosheets in 80ml toluene by ultrasonic waves to form a graphene nanosheet dispersion. Add the graphene nanosheet dispersion into the natural rubber solution, heat and stir to obtain the graphene nanosheet / natural rubber dispersion, and add 0.12g stearic acid, 0.15g sulfur, 0.021g DM and 0.09g zinc oxide successively. The temperature is 60°C, the stirring rate is 800r / min, and the time is 12h.

[0045] Get 25ml graphene nanosheet / natural rubber dispersion and pour into the PTFE mold that three-dimensional graphene foam is housed, utilize natural dry...

Embodiment 3

[0048] In the present embodiment, the preparation method of high thermal conductivity graphene composite material is as follows:

[0049] Take 120ml of toluene solvent and dissolve 3g of natural rubber under the condition of heating and stirring, the temperature is 40°C, the magnetic stirring rate is 300-600r / min, and the stirring time is 6-8h to form a natural rubber solution. Get 500mg of graphene nanosheets, and disperse the graphene nanosheets in 100ml toluene by ultrasonic waves to form a graphene nanosheet dispersion. Add the graphene nanosheet dispersion into the natural rubber solution, heat and stir to obtain the graphene nanosheet / natural rubber dispersion, and add 0.03g stearic acid, 0.12g sulfur, 0.021g DM and 0.24g zinc oxide successively. The temperature is 60°C, the stirring rate is 1000r / min, and the time is 12h.

[0050] Get 30ml graphene nanosheet / natural rubber dispersion liquid and add in the PTFE mold that three-dimensional graphene foam is housed, utiliz...

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Abstract

The invention relates to a preparation method of a graphene composite with high thermal conductivity, in particular to a method for embedding a graphene nanosheet / natural rubber dispersion in 3D graphene foam prepared with a chemical vapor deposition method, and the graphene composite obtained with the method can be used as a transverse heat-conducting cooling fin and a heat interface cooling fin.The preparation method mainly comprises the steps as follows: dispersing graphene nanosheets in a natural rubber solution to prepare the graphene nanosheet / natural rubber dispersion; pouring the dispersion in a mold containing 3D graphene foam, and performing natural drying or heating drying to prepare a graphene nanosheet / 3D graphene foam / natural rubber composite; performing hot-pressing vulcanization to obtain the graphene composite with high thermal conductivity. The process is simple, and the problems of reduction of mechanical properties, resource shortage, high price and equipment complexity and the like caused by excessive use of heat conducting fillers such as aluminum oxide, aluminum nitride, silicon carbide, copper and silver in original heat conducting materials are solved.

Description

technical field [0001] The invention relates to the field of graphene nanosheets, three-dimensional graphene foam, natural rubber, graphene nanosheets / natural rubber embedded in three-dimensional graphene foam pore structure, and rubber vulcanization, specifically the preparation of a high thermal conductivity graphene composite material method, the graphene composite material obtained by this method can be used as a lateral heat conduction heat sink and a thermal interface heat sink. Background technique [0002] Thermally conductive composite materials are an indispensable and important part of high-power electronic devices, and are the key to ensuring long-term normal operation of electronic devices or high-power consumption. Thermally conductive composite material is a composite material formed by uniformly dispersing thermally conductive fillers into a polymer matrix. Thermally conductive composite materials mainly include thermally conductive fillers and polymer matri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08K13/04C08K7/24C08K3/04C08K5/09C08K3/06C08K3/22
CPCC08K3/06C08K3/22C08K5/09C08K7/24C08K13/04C08K2003/2296C08K2201/011C08K3/042C08L7/00
Inventor 任文才吴召洪徐川成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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