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Graphene heat dissipation film and preparation method thereof

A technology of graphene heat dissipation film and graphene, which is applied in the field of graphene heat dissipation film and its preparation, can solve the problems of complex preparation process of graphene heat dissipation film for mobile phones, poor quality of graphene oxide raw materials, and reduced performance of graphene heat dissipation film. Ease of large-scale production and application, low price, and low production cost

Pending Publication Date: 2020-05-12
中科悦达(上海)材料科技有限公司
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Problems solved by technology

[0005] In order to solve the problems in the above-mentioned prior art that there are too many graphene heat dissipation film carriers for mobile phones, which is not conducive to batch production, the poor quality of graphene oxide raw materials leads to the decrease in the performance of graphene heat dissipation film, and the complicated preparation process of mobile phone graphene heat dissipation film. , the present invention aims to provide a graphene heat dissipation film, the graphene heat dissipation film is only composed of graphene, and the graphene is graphene oxide obtained by ultrasonic treatment after graphite is chemically oxidized by bismuth salt under strong acid conditions. obtained by high temperature reduction

Method used

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  • Graphene heat dissipation film and preparation method thereof
  • Graphene heat dissipation film and preparation method thereof

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[0037] See figure 1 The preparation method of the graphene loose film of the present invention includes the following four steps: In the first step, the flake graphite is chemically oxidized with bismuth salt under strong acid conditions, washed to a pH of 5-7, and then subjected to ultrasonic treatment to obtain oxidation The graphene aqueous dispersion is spray-dried to obtain graphene oxide powder; the second step is to configure the graphene oxide powder into a slurry, and the graphene oxide slurry is coated on the base material; the third step is to The base material coated with the graphene oxide slurry is dried, and the base material is separated from the dried graphene oxide film; the fourth step is to reduce the dried graphene oxide film at high temperature to obtain a graphene heat dissipation film.

[0038] Preferably, in the first step, the water used in the ultrasonic treatment is deionized water or distilled water.

[0039] Preferably, in the first step, the temperatu...

Embodiment 1

[0049] Put 10g flake graphite (600 mesh) into 300mL concentrated sulfuric acid (mass concentration 98%), after mechanical stirring for 30min, put 40g sodium bismuthate at 10℃, stir at 40℃ for 2h, then pour the reaction solution into 300mL. After filtering the ionized water with a ceramic membrane filter device, the obtained solid is washed to a pH of 5-7, and then added to 1000 mL of deionized water and ultrasonically treated for 1 hour to obtain an aqueous dispersion of graphene oxide.

[0050] The above aqueous graphene oxide dispersion is spray-dried at 120° C. to obtain graphene oxide powder. Disperse the graphene oxide powder in deionized water to form a graphene oxide slurry with a solid content of 3%, and apply it on the PET film with a film coater, and dry it in an oven at 50°C for 3 hours. Remove the graphene oxide film and use A graphene heat dissipation film with a thickness of 30 μm was obtained by reducing at a high temperature of 1200°C for 30 minutes.

[0051] The g...

Embodiment 2

[0054] Put 10g flake graphite (1000 mesh) into 300mL concentrated sulfuric acid (mass concentration 98%), after mechanical stirring for 30min, put 40g sodium bismuthate at 10℃, stir at 40℃ for 2h, then pour the reaction solution into 300mL. After filtering the ionized water with a ceramic membrane filter device, the obtained solid is washed to a pH of 5-7, and then added to 1000 mL of deionized water and ultrasonically treated for 1 hour to obtain an aqueous dispersion of graphene oxide.

[0055] The above aqueous graphene oxide dispersion is spray-dried at 120° C. to obtain graphene oxide powder. Disperse the graphene oxide powder in deionized water to form a graphene oxide slurry with a solid content of 3%, and apply it on the PET film with a film coater, and dry it in an oven at 50°C for 3 hours. Remove the graphene oxide film and use Reduced at a high temperature of 1200°C for 30 minutes to obtain a graphene heat dissipation film with a thickness of 33 μm.

[0056] The graphen...

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Abstract

The invention relates to a graphene heat dissipation film and a preparation method thereof, the graphene heat dissipation film is only composed of graphene, and the graphene is obtained by high temperature reduction of graphene oxide obtained by ultrasonic treatment after chemical oxidation of graphite with bismuthate under a strong acid condition. The preparation method comprises the following steps: S1, chemically oxidizing crystalline flake graphite by using bismuthate under a strong acid condition, washing the product until the pH value is 5-7, carrying out ultrasonic treatment to obtain agraphene oxide aqueous dispersion liquid, and carrying out spray drying to obtain graphene oxide powder; S2, preparing the graphene oxide powder into slurry, and coating a substrate material with thegraphene oxide slurry; s3, drying the substrate material coated with the graphene oxide slurry, and separating the substrate material from the dried graphene oxide film; and S4, performing high-temperature reduction on the dried graphene oxide film to obtain the graphene heat dissipation film. The graphene heat dissipation film provided by the invention has the characteristics of low cost and good heat dissipation performance, and can be suitable for 5G mobile phones.

Description

Technical field [0001] The invention relates to a graphene material, and more specifically, to a graphene heat dissipation film and a preparation method thereof. Background technique [0002] As a newly developed two-dimensional material, graphene has many excellent properties. The thermal conductivity of single-layer defect-free graphene can reach 5300W / mK, which is much higher than that of copper (398W / mK) and other metal thermal conductive materials. At the same time, graphene materials have high strength and good flexibility, can be prepared to obtain high-strength flexible films, and have good development prospects in the field of heat conduction and heat dissipation. [0003] Since its inception, the mobile phone has gradually evolved into an indispensable tool for work, life, and entertainment. The heat dissipation of mobile phones has always been one of the key issues affecting the life of mobile phones. How to effectively solve the problem of mobile phone heat dissipation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/194H05K7/20
CPCC01B32/19C01B32/194H05K7/2039
Inventor 丁古巧张明杰周久顺冯天英颜柱梁猛李彦宏
Owner 中科悦达(上海)材料科技有限公司
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