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Preparation method of graphene heat conducting film

A graphene and thermally conductive film technology, which is applied to devices for coating liquids on surfaces, pretreatment surfaces, coatings, etc., can solve the problems of complex processes, low graphene orientation, low thermal conductivity and tensile strength, etc. Achieve good orientation, high porosity, and reduce the effect of agglomeration

Active Publication Date: 2016-09-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a graphene heat-conducting film in order to solve the problems of the existing graphene heat-conducting film preparation method with complex process, low orientation of graphene obtained, low thermal conductivity and low tensile strength

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0024] The present invention provides a kind of preparation method of graphene heat conduction film, and the method comprises:

[0025] Step 1: Soak the graphite in the mixed acid solution, then add the intercalation agent and stir to obtain the mixed solution;

[0026] Step 2: adding an organic reagent to the mixed solution obtained in Step 1 to react to obtain an aqueous dispersion of graphene;

[0027] Step 3: Adding natural plant long fibers or polymer long fibers to the graphene dispersion obtained in step 2 for super-generation treatment to obtain a fiber graphene mixed dispersion;

[0028] Step 4: The fiber-graphene mixed dispersion obtained in Step 3 is placed on the substrate, and the film obtained after drying is treated at a temperature of 500-900° C. for 15-30 minutes to obtain a graphene heat-conducting film.

[0029] According to the present invention, the graphite is soaked in the mixed acid solution first, and then the intercalation agent is added to stir to o...

Embodiment 1

[0041] Add 10g of expanded graphite (25 mesh) into 200mL of mixed acid (concentrated sulfuric acid and concentrated nitric acid), then add perchloric acid, in which concentrated H 2 SO 4 / HClO 4 / concentrated HNO 3 =0.5 / 1 / 1, Stir evenly and seal well, after ultrasonic treatment for 30 minutes, magnetically stir for 6 hours, then slowly add 100mL hydrazine hydrate solution dropwise to the mixture while stirring, stir for 2min, the volume of the above mixture will expand rapidly, Turn into a black viscous colloid, wash the resulting gel with deionized water to neutrality, and supercharge for 30 minutes to obtain an aqueous dispersion of graphene. In the aqueous dispersion of graphene, the thickness of graphene is 2 nanometers. The layer size is 300 microns and the concentration is 10g / L;

[0042] Add degreased wood fiber chopped into above-mentioned graphene dispersion liquid, the addition amount of relative graphene is 12.5%, fiber length 3 millimeters, fiber thickness 7 mi...

Embodiment 2

[0046] Add 10g of flake graphite (200 mesh) to 1L of mixed acid (concentrated sulfuric acid and concentrated nitric acid), then add bromic acid, in which concentrated H 2 SO 4 / HBrO 3 / concentrated HNO 3 =8 / 1 / 3, Stir evenly and seal well, after ultrasonic treatment for 30 minutes, magnetically stir for 24 hours, then slowly add 500mL hydrazine hydrate solution dropwise to the mixture while stirring, stir for 10min, the volume of the above mixture will expand rapidly, Turn into a black viscous colloid, wash the resulting gel with deionized water to neutrality, and supercharge for 30 minutes to obtain an aqueous dispersion of graphene. In the aqueous dispersion of graphene, the thickness of graphene is 2 nanometers. The layer size is 150 microns and the concentration is 1g / L;

[0047] Add absorbent cotton fiber chopped into above-mentioned graphene dispersion liquid, the addition amount of relative graphene is 10%, fiber length 3 millimeters, fiber thickness 6 microns, then ...

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Abstract

The invention provides a preparation method of a graphene heat conducting film and belongs to the technical field of graphene materials. The problems that according to the conventional preparation method of the graphene heat conducting film, the technology is complicated and obtained graphene is low in orientation degree, poor in heat conducting property and low in tensile strength are solved. The method comprises: first soaking graphite in an acid-blended solution, and then adding an intercalator and stirring the mixture so as to obtain a mixed solution; then, adding an organic reagent into the mixed solution for reaction so as to obtain graphene aqueous dispersion; adding natural plant macrofibers or polymer macrofibers into the graphene aqueous dispersion, and carrying out ultrasonic processing so as to obtain fiber and graphene mixed dispersion; and finally arranging the fiber and graphene mixed dispersion on a substrate, and processing a film obtained after drying at a temperature of 500-900 DEG C for 15-30 minutes so as to obtain the graphene heat conducting film. The graphene heat conducting film prepared by the method has high orientation degree. The heat conducting coefficient can reach 1000-1500W / mK, and the mechanical tensile strength can reach 30-70MPa.

Description

technical field [0001] The invention belongs to the technical field of graphene materials, and in particular relates to a preparation method of a graphene heat conduction film. Background technique [0002] Heat conduction and heat dissipation have significant application requirements in many fields such as electronics, communications, lighting, aviation, and national defense. The mainstream heat-conducting materials in the market are still mostly aluminum and copper metals or alloys, while graphite heat-conducting films have been widely used in the past decade and quickly occupied the market share of traditional materials. Graphite thermal conductive film has the following advantages: high thermal conductivity of 300-1500w / m k, higher than that of various aluminum alloys and simple copper materials; at the same time, the weight is 25% lighter than aluminum and 75% lighter than copper; And it is easy to cut and cut, easy to use. [0003] At present, there are two main meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D7/04B05D3/02C04B35/536C04B35/622C04B35/52
Inventor 牛利吴同舜
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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