Construction method of graphene-based thermal interface material with mutually vertical structure

A thermal interface material, technology perpendicular to each other, applied in the direction of graphene, nano-carbon, etc., can solve the problems of materials that cannot be prepared, and achieve the effects of simplified preparation, avoiding conventional freeze-drying, excellent interface thermal diffusion and conductivity

Inactive Publication Date: 2021-03-12
SHENZHEN STRONG ADVANCED MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing TIM preparation methods cannot prepare materials with this special structure.

Method used

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  • Construction method of graphene-based thermal interface material with mutually vertical structure
  • Construction method of graphene-based thermal interface material with mutually vertical structure
  • Construction method of graphene-based thermal interface material with mutually vertical structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a kind of preparation method of vertical graphene airgel, such as figure 1 As shown, the specific steps of the method are as follows:

[0052] 1) Preparation of graphene oxide dispersion: Weigh 4g flake graphite and put it in a beaker, pour 450ml of concentrated sulfuric acid and 50ml of phosphoric acid into the beaker to prepare mixed solution I, and stir at room temperature for 40min. Place the beaker in a water bath for heating, add 18g of potassium permanganate to the mixed solution I in 8 times to obtain the mixed solution II, heat the mixed solution II at 70°C, take it out after 16 hours and cool it at room temperature. After cooling to room temperature, the mixed solution II was slowly poured into 700ml hydrogen peroxide mixed with ice water, and after standing for 24 hours, the supernatant liquid was filtered off, and the lower layer solution was taken for centrifugal washing to obtain a high-concentration graphene oxide solution. Final...

Embodiment 2

[0067] This embodiment provides a kind of preparation method of vertical graphene airgel, such as figure 1 As shown, the specific steps of the method are as follows:

[0068] 1) Preparation of graphene oxide dispersion: Weigh 4g flake graphite and put it in a beaker, pour 450ml of concentrated sulfuric acid and 50ml of phosphoric acid into the beaker to prepare mixed solution I, and stir at room temperature for 40min. Place the beaker in a water bath for heating, add 18g of potassium permanganate to the mixed solution I in 8 times to obtain the mixed solution II, heat the mixed solution II at 70°C, take it out after 16 hours and cool it at room temperature. After cooling to room temperature, the mixed solution II was slowly poured into 700ml hydrogen peroxide mixed with ice water, and after standing for 24 hours, the supernatant liquid was filtered off, and the lower layer solution was taken for centrifugal washing to obtain a high-concentration graphene oxide solution. Final...

Embodiment 3

[0083] This embodiment provides a kind of preparation method of vertical graphene airgel, such as figure 1 As shown, the specific steps of the method are as follows:

[0084]1) Preparation of graphene oxide dispersion: Weigh 4g flake graphite and put it in a beaker, pour 450ml of concentrated sulfuric acid and 50ml of phosphoric acid into the beaker to prepare mixed solution I, and stir at room temperature for 40min. Place the beaker in a water bath for heating, add 18g of potassium permanganate to the mixed solution I in 8 times to obtain the mixed solution II, heat the mixed solution II at 70°C, take it out after 16 hours and cool it at room temperature. After cooling to room temperature, the mixed solution II was slowly poured into 700ml hydrogen peroxide mixed with ice water, and after standing for 24 hours, the supernatant liquid was filtered off, and the lower layer solution was taken for centrifugal washing to obtain a high-concentration graphene oxide solution. Finall...

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Abstract

The invention discloses a construction method of a graphene-based thermal interface material with a mutually vertical structure. According to the construction method, in order to realize mutually vertical arrangement of graphene sheet layers, a temperature gradient is introduced by utilizing one-way freezing of a flat plate, under the driving action of the temperature gradient, the height directional arrangement of graphene sheets in the vertical direction can be achieved, wherein the pre-reduced graphene hydrogel forms a bottom parallel structure under the induction of gravity and the bottomof a container, the upper part of the pre-reduced graphene hydrogel is vertically arranged, and a directional structure with the parallel bottom and the vertical upper part is kept under the subsequent reduction. The graphene macroscopic body prepared by the method has a special directional structure with the parallel bottom and the vertical upper part, can fully exert excellent performance of graphene in a plane direction, solves the problems of local hot spots and heat conduction at an interface, and can be used as a thermal interface material to be applied to the field of thermal management.

Description

technical field [0001] The invention belongs to the field of thermal interface materials, and relates to a construction method of a high-performance thermal interface material, in particular to a construction method of a graphene-based thermal interface material with mutually perpendicular structures. Background technique [0002] Electronic equipment generates heat during operation. The temperature rise not only affects the normal operation of the equipment, but also reduces the service life of the equipment and poses safety hazards. Therefore, effective heat dissipation is very important for the normal operation of electronic equipment. Since there are micron-scale grooves on any surface, when two solid surfaces (for electronic products, usually the surface of a device and a heat sink) are in contact with each other, the effective contact area is less than 1%, and these tiny gaps are filled with air. Air is a poor conductor of heat, and its thermal conductivity is only 0.2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/24C01B32/19
CPCB29C67/24C01B32/19
Inventor 李宜彬王沙沙杜善义赫晓东
Owner SHENZHEN STRONG ADVANCED MATERIALS RES INST CO LTD
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