Method for preparing graphene heat dissipation film by using self-propagating stripping technology

A ene heat dissipation film and self-propagating technology, applied in the field of graphene, can solve the problems of low yield of large-scale graphene oxide, small size of graphene oxide sheet, low thermal conductivity of graphene film, etc., to achieve excellent heat dissipation effect, The effect of large size and high single-layer rate
CN111137879AActive Publication Date: 2020-05-12NANJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF TECH
Publication Date
2020-05-12

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Abstract

The invention relates to the technical field of graphene, and aims to provide a method for preparing a graphene heat dissipation film by using a self-propagating stripping technology. The method comprises the following steps: carrying out chemical modification on a graphite oxide dispersion liquid by using hydrogen peroxide or ammonia water, and carrying out homogenizing and defoaming under vacuum; coating water-permeable nylon cloth with modified graphite oxide slurry obtained in the previous step to form a graphite oxide film; drying the graphite oxide film and stripping a substrate to obtain a modified graphite oxide film; after heating, carrying out self-propagating stripping to obtain a few-layer stripped graphene film; carrying out firing in an inert atmosphere, and performing cooling to obtain graphene foam; and conducting rolling to form a film, and carrying out trimming post-treatment to obtain the graphene heat dissipation film. The graphite oxide film is uniformly heated, uneven decomposition of functional groups can be avoided, and pretreatment efficiency is improved. The graphene is high in single-layer rate and large in size; the graphene film is excellent in heat conduction performance, high in strength and better in heat dissipation effect. Any toxic and harmful chemical reagent is not adopted, the preparation process is simple, and efficient and high-quality reduction of the graphite oxide film is realized.
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Description

technical field

[0001] The invention belongs to the technical field of graphene, and in particular relates to a method for preparing a graphene heat dissipation film by using a self-propagating stripping technology. Background technique

[0002] Graphene is a two-dimensional nano-carbon material, composed of carbon atoms arranged in a honeycomb shape, with a thickness of only 0.335nm. It has excellent thermal properties, mechanical properties and flexibility, and its thermal conductivity can reach 5300-6000W / (m·K ), the tensile strength reaches 130GPa, and the Young's modulus reaches 1.0TPa. It has been widely used in the field of thermal management in recent years.

[0003] Graphene heat dissipation film is composed of graphene layer stacks, which has excellent thermal conductivity and mechanical properties. The surface thermal conductivity of graphene heat dissipation film measured by laser flash method (LFA) can reach 500-1500W / (m K), while the radial thermal conductivit...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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