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Transparent and insulating graphene composite heat-conducting film and preparation method thereof

A graphene composite and graphene film technology, applied in chemical instruments and methods, heat exchange materials, coatings, etc., can solve problems such as difficult to meet, high energy consumption, environmental pollution, etc., to avoid the use of organic solvents, Excellent thermal expansion coefficient and small thermal expansion coefficient

Inactive Publication Date: 2017-06-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese patent (201310558179.8) is a graphene-modified heat-conducting film. This method of preparing a heat-conducting film by combining graphene and polyimide requires the use of organic reagents in the preparation process, which is easy to pollute the environment.
Chinese patent (201410828852.X) high thermal conductivity graphene-based polymer heat conduction film and its preparation method. This method of preparing heat conduction film by compounding graphene and various polymers requires high temperature carbonization and graphitization, which consumes a lot of energy. Moreover, the thermal expansion coefficient of the polymer matrix in the two methods is much higher than that of nanocellulose, and it is not easy to form a good match with graphene. At the same time, due to the high electrical conductivity of the graphene filler, it is not easy to realize the electrical insulation of the film, and it is difficult to meet the requirements of some parts. Electronic Product Requirements

Method used

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  • Transparent and insulating graphene composite heat-conducting film and preparation method thereof
  • Transparent and insulating graphene composite heat-conducting film and preparation method thereof
  • Transparent and insulating graphene composite heat-conducting film and preparation method thereof

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Embodiment 1

[0030] A method for preparing a transparent and insulating high-performance graphene composite heat-conducting film, the specific steps are as follows:

[0031] (1). The nanocellulose film is obtained by vacuum filtration and drying of the nanocellulose dispersion;

[0032] (2). The nanocellulose film obtained in step (1) is fully washed with ethanol and deionized water;

[0033] (3). The film obtained in step (2) was first immersed in a graphene oxide solution (0.1 mg / mL) for 5 minutes, then immersed in deionized water for 2 minutes, and dried in a hot air flow in an infrared rapid drying oven;

[0034] (4). Immerse the film obtained in step (3) in the nanocellulose dispersion (0.1mg / mL) for 5 min, then repeat step (3), and go through the same rinsing and drying process;

[0035] (5). Repeat step (3) and step (4) 40 times to obtain nanocellulose-graphene oxide composite film;

[0036] (6). Put the composite film obtained in step (5) into a reducing solution, raise the tempe...

Embodiment 2

[0041] A method for preparing a transparent and insulating high-performance graphene composite heat-conducting film, the specific steps are as follows:

[0042] (1). The nanocellulose film is obtained by vacuum filtration and drying of the nanocellulose dispersion;

[0043] (2). The nanocellulose film obtained in step (1) is fully washed with ethanol and deionized water;

[0044] (3). The film obtained in step (2) was first immersed in graphene oxide solution (3 mg / mL) for 10 minutes, then immersed in deionized water for 5 minutes, and dried in a hot air flow in an infrared rapid drying oven;

[0045] (4). Immerse the film obtained in step (3) in the nanocellulose dispersion (3 mg / mL) for 10 min, then repeat step (3) and go through the same rinsing and drying process;

[0046] (5). Repeat step (3) and step (4) 40 times to obtain nanocellulose-graphene oxide composite film;

[0047] (6). Put the composite film obtained in step (5) into a reducing solution, raise the temperatu...

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Abstract

The invention relates to a method for preparing a transparent and insulating graphene composite heat-conducting film. According to the method, the heat-conducting film is prepared through the compositing of nanocellulose, graphene and boron nitride. Through filtration drying of nanocellulose dispersion liquid, a nanocellulose film is obtained, the nanocellulose film is immersed in graphene oxide solution, the obtained film is immersed in the nanocellulose dispersion liquid, and a nanocellulose - graphene oxide composite film is obtained by repeating the two-step operations many times, the composite film is placed in a solution to be restored, and a nanocellulose-graphene film is obtained. Mixed solution of the nanocellulose and boron nitride is prepared through an ultrasonic mixing method. The obtained film is immersed in the mixed solution of the cellulose and boron nitride, and a nanocellulose - graphene - boron nitride heat-conducting film is obtained. The film has superhigh anisotropy and is suitable for horizontal heat dissipation of a modern electronic device. The film is good in transparency. Since an outer layer is a mixed film of boron nitride and cellulose, an electric insulation effect can be achieved, and requirements of special electronic devices are met.

Description

technical field [0001] The invention relates to a heat-conducting film and a preparation method thereof, in particular to a transparent and insulating graphene composite heat-conducting film and a preparation method thereof. Background technique [0002] In recent years, with the development of science and technology, electronic equipment has become more and more densely packaged, making efficient heat dissipation a crucial issue in the development of electronic devices. Compared with traditional thermally conductive thin film materials, flexible thin film materials with anisotropic thermal conductivity are increasingly required in the thermal management of modern electronic devices. Because graphene has extremely high thermal conductivity, people mainly combine graphene with polymers to prepare thermal conductive films. For example, the Chinese patent (201310558179.8) is a graphene-modified heat-conducting film. This method of preparing a heat-conducting film by compoundin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08L1/02C09K5/14
CPCC08J7/0423C08J2301/02C08J2401/02C09K5/14
Inventor 宋娜潘海东丁鹏施利毅焦德金崔思奇
Owner SHANGHAI UNIV
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