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A kind of composite graphite film and its preparation method and application

A technology of composite graphite and composite film, applied in the field of graphite film, can solve the problems of low carbonization degree of polyimide graphite film, low fracture strength, poor electrical conductivity and thermal conductivity, etc., so as to improve the degree of carbonization and graphitization, and improve the thermal conductivity. and electrical conductivity, improve the effect of dispersion

Active Publication Date: 2019-11-12
北京兴科迪电子技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the defects in the prior art that polyimide is prepared with poor electrical conductivity and thermal conductivity, thereby providing a composite graphite film and its preparation method and application;
[0005] Another technical problem to be solved by the present invention is to overcome the defects of the degree of carbonization and low breaking strength of the polyimide graphite film in the prior art, thereby providing a composite graphite film and its preparation method and application

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  • A kind of composite graphite film and its preparation method and application
  • A kind of composite graphite film and its preparation method and application

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Embodiment 1

[0031] A preparation method for a composite graphite film, comprising the steps of:

[0032] (1) Select nano-diamonds with a particle diameter of 5nm, add them to N,N-dimethylacetamide (DMAc) solution, and ultrasonically disperse them until there are no obvious particles to form a nano-diamond suspension;

[0033] (2) Introduce nitrogen into the nano-diamond suspension, add 1mol 4,4'-diaminodiphenyl ether, stir until completely dissolved, then add 1mol pyromellitic anhydride three times while stirring, polyamic acid solution containing nano-diamonds, wherein the content of nano-diamonds in the polyamic acid mixed solution is 4,4'-diaminodiphenyl ether and pyromellitic acid diphenyl ether 0.1wt% of the sum of anhydride masses;

[0034] (3) Coat the polyamic acid solution on a glass plate, keep the temperature at 80°C for 2 hours, remove the film, fix the film on a shelf, place it in an oven, and adjust the heating rate of the oven to 3°C / min, First raise the temperature to 10...

Embodiment 2

[0037]A preparation method for a composite graphite film, comprising the steps of:

[0038] (1) choose the diameter to be 100nm nano-diamond, join in the DMAc solution, ultrasonically disperse to no obvious particle, form nano-diamond suspension;

[0039] (2) Pass argon into the nanodiamond suspension, add 1mol 4,4'-diaminodiphenyl ether, stir until completely dissolved, then add 1.5mol pyromellitic anhydride in five times under stirring, Under stirring, polycondensation reaction at 10°C for 2 hours at low temperature to obtain a polyamic acid solution containing nano-diamonds, wherein the content of nano-diamonds in the polyamic acid solution is 4,4'-diaminodiphenyl ether and pyromellitic acid 10wt% of the sum of dianhydride mass;

[0040] (3) Coat the polyamic acid solution on a glass plate, keep the temperature at 80°C for 2 hours, remove the film, fix the film on a shelf, place it in an oven, and control the heating rate of the oven to 5°C / min, Firstly raise the temperat...

Embodiment 3

[0043] A preparation method for a composite graphite film, comprising the steps of:

[0044] (1) choose the diameter to be 50nm nano-diamond, join in the DMAc solution, ultrasonically disperse to no obvious particle, form nano-diamond suspension;

[0045] (2) Pass argon into the nanodiamond suspension, add 1mol 4,4'-diaminodiphenyl ether, stir until completely dissolved, then add 1.02mol pyromellitic anhydride in five times under stirring, Under the stirring state, polycondensation reaction was carried out at -5°C for 6 hours at a low temperature to obtain a polyamic acid solution containing nano-diamonds, wherein the content of nano-diamonds in the polyamic acid solution was 4,4'-diaminodiphenyl ether and pyromellitic 0.5wt% of the sum of the mass of formic dianhydride;

[0046] (3) Cast the polyamic acid solution on a glass plate, keep the temperature at 80°C for 2 hours, remove the film, fix the film on a shelf, place it in an oven, and control the heating rate of the oven...

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Abstract

The invention discloses a composite graphite film and a preparation method and application thereof. The preparation method comprises the following steps: preparing a polyimide composite film formed by nano-diamond and polyimide; under the protection of an inert gas, performing carbonization and graphitization, and then removing graphite paper to obtain the composite graphite film formed by nano-diamond and polyimide. In the carbonization and graphitization process, as a crystal nucleus, nano-diamond promotes carbonization and graphitization of polyimide, so that the heat-conducting property and the electric conductivity of a composite carbon film are improved.

Description

technical field [0001] The invention belongs to the field of graphite film, and in particular relates to a composite graphite film formed of nano-diamond and polyimide, a preparation method and application thereof. Background technique [0002] With the continuous development of electronic products in the direction of precision, precision and energy saving, the requirements for electronic devices that make up electronic products are also increasing. Graphite with a highly oriented layered structure is widely used in electronic devices due to its good thermal and electrical conductivity. The traditional method of preparing highly oriented graphite is obtained by high-temperature pyrolysis of pyrolytic carbon under stress, and the highly oriented graphite prepared by this method is called highly oriented pyrolytic graphite. However, the above-mentioned preparation process is relatively complicated, which makes the graphite with a highly oriented structure expensive, which gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/524C04B35/80C04B35/622C04B35/64
CPCC04B35/522C04B35/524C04B35/622C04B35/64C04B2235/427C04B2235/96C04B2235/9607C04B2235/5454C04B2235/661C04B2235/658C04B2235/6567C04B2235/6562
Inventor 白云飞李娜
Owner 北京兴科迪电子技术研究院
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