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Pre-reduced graphene oxide film and preparation method thereof, and graphene heat conduction film and preparation method thereof

A graphene film, graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of increasing the production cost of graphene thermal conductive film, low reduction efficiency of graphene oxide film, etc., to achieve pre-reduction The process is convenient and quick, the choice of reducing agent is wide, and the controllability is strong.

Inactive Publication Date: 2020-11-24
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the thermal reduction process needs to maintain extremely high temperature conditions for a long time, the reduction efficiency of the graphene oxide film is low, which greatly increases the production cost of the graphene thermal conductive film.

Method used

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  • Pre-reduced graphene oxide film and preparation method thereof, and graphene heat conduction film and preparation method thereof
  • Pre-reduced graphene oxide film and preparation method thereof, and graphene heat conduction film and preparation method thereof
  • Pre-reduced graphene oxide film and preparation method thereof, and graphene heat conduction film and preparation method thereof

Examples

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preparation example Construction

[0053] As the first embodiment of the present invention, the present invention shows a method for preparing a pre-reduced graphene oxide film, including: adding a chemical reducing agent to the graphene oxide slurry, stirring and dispersing, coating, drying, and obtaining a pre-reduced graphene oxide film. Reduced graphene oxide film; the chemical reducing agent is 0.005%-0.15% of the graphene oxide content, for example: 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.01%, 0.015%, 0.02%, 0.025%, 0.03%, 0.035%, 0.04%, 0.045%, 0.05%, 0.055%, 0.06%, 0.065%, 0.07%, 0.075%, 0.08%, 0.085%, 0.09%, 0.095%, 0.1%, 0.11% , 0.12%, 0.13%, 0.14%, 0.141%, 0.142%, 0.145%, 0.148%, 0.149%, 0.15%, etc.

[0054] In order to improve the thermal reduction efficiency of graphene heat conduction film prepared from graphene oxide, the pre-reduction treatment of graphene oxide was introduced in the process of preparing graphene heat conduction film, from the original "dispersion-coating-drying-reduction" to ...

Embodiment 1A

[0074] This example shows a preparation process of a pre-reduced graphene oxide film.

[0075] step 1):

[0076] Configure 10 kg of graphene oxide aqueous slurry with a solid content of 2.5%, and measure its viscosity to be 20 Pa s; add 50 mL of solution to dissolve 0.375 g of the chemical reducing agent solution of sodium citrate in the graphene oxide aqueous slurry, and stir evenly After that, its viscosity was measured to be 19.7Pa·s.

[0077] Step 2):

[0078] The solution prepared in step 1) is coated with a film, and dried at 40-120° C. for 20-180 min to obtain a pre-reduced graphene oxide film, such as image 3 As shown, the pre-reduced graphene oxide film is well assembled, and the addition of a small amount of chemical reducing agent will not affect the assembly of the graphene oxide film.

Embodiment 1B

[0080] This embodiment shows a preparation process of a graphene heat-conducting film, and the graphene heat-conducting film is prepared by using the pre-reduced graphene oxide film prepared in Example 1A.

[0081] The pre-reduced graphene oxide film prepared in Example 1A was subjected to thermal reduction at a reduction temperature of 2000-3000° C., and heat preservation treatment was carried out for 2 hours to obtain a graphene heat-conducting film. The thermal conductivity of the graphene thermal film is 1158W / m·K.

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Abstract

The invention provides a pre-reduced graphene oxide film and a preparation method thereof, and a graphene heat conduction film and a preparation method thereof. The prepartion method for the pre-reduced graphene oxide film comprises: adding a chemical reducing agent to graphene oxide slurry, and performing stirring and dispersing, coating, and drying to obtain the pre-reduced graphene oxide film;the chemical reducing agent is 0.005%-0.15% of the content of graphene oxide. The preparation method for the graphene heat conduction film comprises: preparing the pre-reduced graphene oxide film by employing the prepartion method for the pre-reduced graphene oxide film; and further processing the graphene oxide film by employing a thermal reduction method to obtain the graphene heat conduction film. According to the pre-reduced graphene oxide film and the preparation method thereof, and the graphene heat conduction film and the preparation method thereof, the graphene oxide is pre-reduced before being coated, so that the reduction efficiency of the graphene heat conduction film prepared by thermal reduction can be improved, and the production cost is effectively reduced.

Description

technical field [0001] The invention relates to the control of pre-reduction process conditions of graphene oxide slurry and the simultaneous preparation of graphene heat conduction film, which belongs to the field of heat conduction materials and devices. Background technique [0002] Graphene oxide is a two-dimensional material with abundant oxygen-containing groups (hydroxyl, carboxyl, epoxy, etc.) on the surface. This specific structural feature endows it with self-assembly characteristics, and it is easy to self-assemble into a macroscopic membrane material. . Graphene oxide is dispersed in a solvent, coated on the base material (glass, plastic film, aluminum foil, copper foil, etc.), dried to obtain a macroscopically assembled graphene oxide film, and then reduced to obtain a graphene thermally conductive film . At present, graphene thermal conductive film is prepared by using graphene oxide as a precursor to realize large-scale preparation. The prepared graphene th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/24C01B32/184
Inventor 吴艳红唐润理方钢张婧耿飚瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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