High-thermal-conductivity graphene heat dissipation film and preparation method thereof

A high thermal conductivity graphite and ene heat dissipation film technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high viscosity of dispersion liquid or slurry, poor product appearance, small solid content, etc., and achieve easy dispersion And, enhance the effect of solid content, high solid content

Active Publication Date: 2022-04-12
XIAMEN KNANO GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the carbon-carbon bond in graphene oxide is broken and contains a large number of functional groups, the dispersion or slurry has high viscosity and low solid content, and the coating and drying process needs to volatilize a large amount of solvent, and the temperature and coating during the preparation process The process and other conditions are strict, and the appearance of the product is poor, resulting in a low yield

Method used

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  • High-thermal-conductivity graphene heat dissipation film and preparation method thereof
  • High-thermal-conductivity graphene heat dissipation film and preparation method thereof

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Effect test

Embodiment 1

[0067] This embodiment discloses a method for preparing a high thermal conductivity graphene heat dissipation film. The preparation method includes the following steps:

[0068] (1) Mechanically pulverize the leftovers of the artificial graphite film until the fineness is less than or equal to 100 mesh, and obtain the artificial graphite powder.

[0069] (2) Mix graphite oxide with an aqueous solution containing ammonia water, stir evenly, and then add it to a peeling machine for primary peeling until the particle size of the slurry is D99<50 μm to obtain a graphene oxide slurry. Wherein, the pH value of the slurry is 5-9, the mass percentage of graphite oxide is 5 wt%, the mass percentage of ammonia water is 0.2 wt%, and the concentration of ammonia water is 25%.

[0070] (3) Take by weighing 200 parts by weight of graphene oxide slurry, 1 part by weight of artificial graphite powder and sodium dodecylbenzene sulfonate, mix and stir and then join in the peeling machine for se...

Embodiment 2

[0076] This embodiment discloses a method for preparing a high thermal conductivity graphene heat dissipation film. The preparation method includes the following steps:

[0077] (1) Mechanically pulverize the leftovers of the artificial graphite film until the particle size of the slurry is less than or equal to 200 mesh, and obtain the artificial graphite powder.

[0078] (2) Mix graphite oxide with an ethanol solution containing ammonia water, stir evenly, and then add it to a peeling machine for primary peeling until the particle size of the slurry is D99<40 μm, and until the particle size of the slurry is D99<35 μm, the graphene oxide slurry is obtained . Wherein, the pH value is 5-9, the mass percentage of graphite oxide is 4 wt%, the mass percentage of ammonia water is 0.4 wt%, and the concentration of ammonia water is 25%.

[0079] (3) Weighing 150 parts by weight of graphene oxide slurry, 70 parts by weight of artificial graphite powder and glucose, mixed and stirred ...

Embodiment 3

[0085] This embodiment discloses a method for preparing a high thermal conductivity graphene heat dissipation film. The preparation method includes the following steps:

[0086] (1) Mechanically pulverize the leftovers of the artificial graphite film until the particle size of the slurry is less than or equal to 400 mesh, and obtain the artificial graphite powder.

[0087] (2) Mix graphite oxide with an ethanol solution containing ammonia water, stir evenly, and then add it to a peeling machine for primary peeling until the particle size of the slurry is D99<40 μm to obtain a graphene oxide slurry. Wherein, the pH value of the slurry is 5-9, the mass percentage of graphite oxide is 5 wt%, the mass percentage of ammonia water is 0.6 wt%, and the concentration of ammonia water is 30%.

[0088] (3) Weigh 180 parts by weight of graphene oxide slurry, 36 parts by weight of artificial graphite powder and tannic acid, mix and stir evenly, then add to the peeling machine for secondary...

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Abstract

The invention relates to the technical field of heat dissipation materials, in particular to a graphene heat dissipation film and a preparation method thereof. The method comprises the following steps: S1, mechanically crushing an artificial graphite film to obtain artificial graphite powder; s2, mixing graphite oxide in a solvent containing ammonia water, uniformly stirring, and carrying out primary stripping to obtain graphene oxide slurry; s3, mixing the artificial graphite powder, the graphene oxide slurry and a stripping aid, uniformly stirring, and performing secondary stripping to obtain mixed slurry; s4, defoaming the mixed slurry, coating the mixed slurry on a base material, drying, and stripping to obtain a graphene film crude product; s5, placing the graphene film crude product in an inert atmosphere, heating to a first temperature, and carrying out carbonization treatment for a certain time; s6, placing a product obtained in the step S5 in an inert atmosphere, heating to a second temperature, and graphitizing to obtain a graphene film; and S7, carrying out lamination calendaring treatment on the graphene film to obtain the graphene heat dissipation film. The heat dissipation performance of the material can be effectively improved, and the cost is reduced.

Description

technical field [0001] The present application relates to the technical field of heat dissipation materials, in particular to a graphene heat dissipation film and a preparation method thereof. Background technique [0002] Graphene heat dissipation film has broad application prospects in many fields such as communication, electronics, aerospace and medical treatment, and has the characteristics of light weight, thermal conductivity and good flexibility. At present, the mainstream method of preparing graphene heat dissipation film is: disperse graphene oxide, then perform suction filtration or coating to obtain graphene heat dissipation film, or obtain graphite oxide powder by high temperature exfoliation, and then disperse it to make slurry , after coating, a graphene heat dissipation film is prepared. However, since the carbon-carbon bond in graphene oxide is broken and contains a large number of functional groups, the dispersion or slurry has high viscosity and low solid ...

Claims

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Application Information

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IPC IPC(8): C01B32/19C01B32/194
Inventor 林建斌黄卫明洪江彬方崇卿林丽萍孙东升
Owner XIAMEN KNANO GRAPHENE TECH CORP
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