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Preparation method of graphene heat-conducting film and product obtained by preparation method

A graphene film and graphene technology, applied in the direction of graphene, chemical instruments and methods, modification through conduction and heat transfer, etc., can solve the problems of poor film-forming property of graphene, achieve good film-forming property, strong thermal conductivity, The effect of fast delivery

Active Publication Date: 2020-11-13
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the film-forming property of graphene itself is poor, and its derivative graphene oxide with good film-forming property is usually used as the raw material of graphene thermal conductivity film.

Method used

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  • Preparation method of graphene heat-conducting film and product obtained by preparation method

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preparation example Construction

[0026] The invention provides a kind of preparation method of graphene heat conduction film, comprises the steps:

[0027] 1) Mixing the aqueous solution of graphene oxide and the foaming agent, vacuum defoaming and filtering the obtained mixed solution in turn to obtain the graphene oxide dispersion;

[0028] 2) Coating and drying the graphene oxide dispersion in step 1) to obtain a dried graphene oxide film;

[0029] 3) foaming the dried graphene oxide film in step 2) to obtain a foamed graphene oxide film;

[0030] 4) Place the foamed graphene oxide film in the step 3) in the interlayer of graphite sheets, and then perform high temperature treatment, vacuum treatment, air replacement treatment and hot pressing treatment in order to obtain a graphene heat conducting film;

[0031] The air replacement treatment is to introduce high thermal conductivity gas to replace the air in the pores of the heat conduction film with high thermal conductivity gas.

[0032] The present in...

Embodiment 1

[0043] S1. Put the graphene oxide aqueous solution (the mass concentration of graphene oxide is 0.5g / L, the sheet diameter is 10μm) and ammonium bicarbonate (the foaming agent is 2% of the mass of graphene oxide) in a high-speed shearing machine at 5000rpm Stir and disperse for 2 hours at a certain speed;

[0044] S2. Defoaming the mixed solution obtained in S1 for 20 minutes under a vacuum of 100 Pa, and then filtering it through a filter to obtain a graphene oxide dispersion;

[0045] S3. Coat the graphene oxide dispersion on the polytetrafluoroethylene PTFE membrane by a scraper coater, dry the base material coated with the graphene oxide slurry at 50°C, and dry the base material with the drying The graphene oxide film is separated to obtain a dry graphene oxide film;

[0046] S4, placing the dried graphene oxide film in a low-temperature box at 100° C. for low-temperature foaming for 120 minutes to obtain a foamed graphene oxide film;

[0047] S5. After cutting the foame...

Embodiment 2

[0051] S1. Put the graphene oxide aqueous solution (the mass concentration of graphene oxide is 1g / L, and the sheet diameter is 300μm) and ammonium carbonate (the foaming agent is 0.01% of the mass of graphene oxide) in a high-speed shearing machine at a speed of 5000rpm Stir and disperse for 1.5h;

[0052] S2. Defoaming the mixed solution obtained in S1 for 30 minutes under a vacuum of 100 Pa, and then filtering it through a filter to obtain a graphene oxide dispersion;

[0053] S3. Coat the graphene oxide dispersion on the methyl plate by a scraper coater, dry the substrate material coated with the graphene oxide slurry at 100°C, and combine the above substrate material with the dried graphite oxide Graphene film is separated to obtain dry graphene oxide;

[0054] S4, placing the dried graphene oxide film in a low-temperature box at 300° C. for low-temperature foaming for 10 minutes to obtain a foamed graphene oxide film;

[0055] S5. After cutting the foamed graphene oxid...

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Abstract

The invention discloses a preparation method of a graphene heat-conducting film and a product obtained by the preparation method, and belongs to the technical field of heat conduction devices. The preparation method comprises the following steps: 1) mixing an aqueous solution of graphene oxide with a foaming agent, and sequentially carrying out vacuum defoaming and filtering on the obtained mixedsolution to obtain a graphene oxide dispersion liquid, 2) coating and drying the graphene oxide dispersion liquid to obtain a dried graphene oxide film, 3) foaming the dried graphene oxide film to obtain a foamed graphene oxide film, and 4) putting the graphene oxide film into a graphite flake interlayer, and sequentially carrying out high-temperature treatment, vacuumizing treatment, air replacement treatment and hot-pressing treatment to obtain the graphene heat-conducting film. The heat-conducting film prepared by the preparation method of the graphene heat-conducting film provided by the invention has good film-forming property, strong heat conductivity, low production cost and high production efficiency, and is convenient for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of heat conduction devices, and in particular relates to a preparation method of a graphene heat conduction film and a product thereof. Background technique [0002] In recent years, with the continuous miniaturization and integration of electronic systems, their performance and reliability will be more and more subject to the problem of heat conduction. The requirements are also getting stricter. At present, the most widely used and mature thermal conductive material is graphite thermal conductive film. This product is a sheet material with extremely high thermal conductivity made by repeatedly heat-treating polymer films of carbon materials under special sintering conditions. It has thin thickness, High heat conduction efficiency, light weight and so on. Because the ultra-thick thermal conductive film not only has high thermal conductivity, but also has a certain heat storage performance. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H05K7/20
CPCC01B2204/20C01B2204/24C01B2204/26C01B2204/32C01B32/184H05K7/2039
Inventor 张聪陈忠洲何海波苗力孝
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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