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PET/microcrystalline graphene composite heat-conducting film and preparation method thereof

A composite material, microcrystalline graphite technology, applied in the direction of heat exchange materials, chemical instruments and methods, coatings, etc., can solve the problems of limited heat transfer, affecting thermal conductivity, low efficiency, etc., to achieve uniform lamellar structure, The effect of improving thermal conductivity and improving corrosion resistance

Inactive Publication Date: 2017-11-10
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the mainstream heat dissipation product on the market is graphite heat conduction film. However, its heat dissipation performance is far from meeting the heat dissipation requirements of heat dissipation devices in electronic information products, and has become the heat dissipation bottleneck of most electronic products.
[0003] Graphene composite heat conduction film usually adopts redox method to prepare graphene, and adopts the mode of spraying onto the substrate. For example, Chinese patent CN2014103071579 discloses a preparation method and product of graphene composite heat conduction film. The preparation method includes the following steps: S1, the scale Graphite or graphite powder is placed in the mixed solution of concentrated sulfuric acid, potassium persulfate and phosphorus pentoxide and soaked for a day and night, then suction-filtered and dried to complete pre-oxidation; S2, adopt Hummers method to further oxidize the pre-oxidized graphite, namely Fully oxidize in concentrated sulfuric acid and potassium permanganate, then add deionized water to dilute, and after repeated washing and suction filtration, the graphene oxide aqueous solution is obtained; S3, the graphene oxide aqueous solution is sprayed on the substrate by thermal spraying method, deposited Graphene oxide film is obtained; S4, the graphene oxide film is reduced to obtain a graphene film; S5, the graphene film is coated to obtain a graphene composite heat-conducting film; the following problems exist in this patent: 1. Hummers method is adopted If it is, the conjugated structure of the graphene sheet will be destroyed during the oxidation process, resulting in limited heat transfer, thus affecting the thermal conductivity.
2. The efficiency of the spraying method is not high, and it will also cause waste of graphene oxide
At present, there are few research reports on the technical method of preparing expanded microcrystalline graphite from microcrystalline graphite, and then preparing graphene, and using the graphene prepared from microcrystalline graphite to prepare PET / microcrystalline graphene composite heat-conducting film

Method used

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  • PET/microcrystalline graphene composite heat-conducting film and preparation method thereof

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Embodiment 1

[0043] The present embodiment provides a kind of preparation method of expanded graphite, specifically the following steps:

[0044] S111. Get the microcrystalline graphite raw material, the carbon content is 75%, crushing and grinding, until the particle size is 300 mesh microcrystalline graphite powder;

[0045] S112. The microcrystalline graphite powder obtained in step S111, perchloric acid and potassium permanganate are placed in the reaction device for the first chemical intercalation treatment to obtain an acidic suspension of expandable microcrystalline graphite, and the resulting expandable microcrystalline graphite The acid suspension is filtered, and the filtrate is reserved for later use. The specific steps of the first chemical intercalation are: S1121. Mix perchloric acid and microcrystalline graphite powder at a liquid-solid ratio of 20:1L / Kg and stir evenly; S1122. Add a strong oxidant according to the mass ratio of microcrystalline graphite powder to strong ox...

Embodiment 2

[0054] The present embodiment provides a kind of method using expanded graphite in embodiment 1 to prepare graphene, specifically the following steps:

[0055] S11. get the expanded microcrystalline graphite that embodiment 1 obtains;

[0056] S12. The expanded microcrystalline graphite obtained in step S11 is mixed with graphene quantum dots, diluted 5 times and then placed in an ultrasonic reaction device for 2 hours. The temperature of the ultrasonic reaction device is 50 ° C, the frequency is 25000 Hz, and the flow rate is 5.0 m 3 / h, the circulation stirring speed is 2000r / min, finally obtains the stripping material;

[0057] S13. the stripping material is press-filtered and separated in step S12, and then the graphite filter cake is collected, and the stripping liquid can be recycled;

[0058] S14. cleaning: the graphite filter cake in step S13 is used deionized water, and the number of times of cleaning is 4 times to obtain graphene.

Embodiment 3

[0068] The present embodiment provides a kind of preparation method of PET / graphene composite heat conduction film, comprises the following steps:

[0069] S1. select the graphene prepared by embodiment 2 as raw material;

[0070] S2. Place the graphene in the step S1 in a vacuum mixer, add absolute ethanol, the mass ratio of graphene and absolute alcohol is 1:60, the rotating speed of the vacuum mixer is 1800r / min, and the pressure of the stirred tank is -0.1 Mpa , stirring time is 6h, stirs to obtain graphene / ethanol mixed slurry;

[0071] S3. PET film corona: use a corona machine to corona treat PET with a thickness of 30 μm, the discharge power of the corona machine is 1.8KVA, and the speed is 150r / min;

[0072] The graphene / ethanol slurry that adopts desktop coater to be uniformly mixed is coated on the PET film that corona has been treated with the mode of hang coating, and the scraper height is 20mm;

[0073] S5. Dry the PET film coated in step S4, specifically in a v...

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Abstract

The invention relates to the field of preparation of graphene composites and discloses a PET / microcrystalline graphene composite heat-conducting film and a preparation method thereof. Expanded graphite is creatively prepared from microcrystalline graphite used as a raw material through secondary intercalation, a high-quality graphene product is obtained through ultrasonic treatment with a mechanical exfoliation method, and the PET / microcrystalline graphene composite heat-conducting film with high heat conductivity can be prepared in batches through process optimization of the graphene product. The prepared PET / microcrystalline graphene composite heat-conducting film has the graphene coating thickness of 3-9 mu m, the thermal diffusion coefficient of 8-12 cm<2> / S and the heat conductivity coefficient of 1,400-1,700 W / (m*k).

Description

technical field [0001] The invention belongs to the field of graphene composite material preparation, more specifically, relate to a kind of PET / microcrystalline graphene composite material heat conduction film and preparation method thereof. Background technique [0002] For electronic products, the effective heat dissipation of its various components to obtain a lower operating temperature will have an extremely important impact on its service life and operating speed. With the continuous development and progress of science and technology, especially the multi-core of computer chips has become the mainstream, and the running speed continues to increase, and the power also increases accordingly. Effective heat dissipation plays a decisive role in its running speed. At present, the mainstream heat dissipation product on the market is graphite heat conduction film. However, its heat dissipation performance is far from meeting the heat dissipation requirements of heat dissipat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08J7/12C08L67/02C08K9/02C08K9/00C08K3/04C09K5/14
CPCC08J7/06C08J7/123C08J2367/02C08K3/04C08K9/00C08K9/02C09K5/14
Inventor 林前锋李丽萍
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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