Graphene heat-conducting silica gel sheet and preparation method thereof

A technology of thermally conductive silica gel sheet and thermally conductive silica gel, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of small application range of graphene sheets, and achieve the effect of simple manufacturing method, easy operation and good thermal conductivity.

Active Publication Date: 2021-02-05
福建永安市永清石墨烯研究院有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to provide a graphene thermally conductive silica gel sheet and its preparation method, to overcome the defect that the applicable range of graphene sheets is relatively small in the prior art

Method used

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  • Graphene heat-conducting silica gel sheet and preparation method thereof

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preparation example Construction

[0023] A preparation method of a graphene thermally conductive silica gel sheet, comprising the following steps:

[0024] Step 1: dissolving graphene oxide in distilled water to prepare a graphene oxide aqueous solution of 0.1wt% to 1.5wt%;

[0025] Step 2: The graphene oxide aqueous solution is coated on the heating plate to form a layer of 1-2 mm film. After the film loses 40wt% to 50wt% of water and falls off the heating plate, a bundle of carbon fiber bundles is used as a rolling rod to roll it. Rolled into a roll to obtain a graphene oxide roll, and dried in an oven;

[0026] Step 3: carbonize the graphene oxide roll first, and then graphitize it to obtain a density of 0.1 to 0.2 g / cm 3 Graphene roll film;

[0027] Step 4: Cut the graphene roll film into graphene sheets with a thickness of not less than 0.3mm;

[0028] Step 5: configure a thermally conductive silica gel solution; vacuum mix A / B two-component silica gel, and obtain a thermally conductive silica gel solu...

Embodiment 1

[0061] A preparation method for a graphene thermally conductive silica gel sheet, comprising the following steps:

[0062] Step 1: Dissolve 5.18g of graphene oxide with a solid content of 38.6% in 194.82g of distilled water, and combine with ultrasonic stirring for 2h to prepare a 1wt% graphene oxide aqueous solution;

[0063] Step 2: Coat the graphene oxide aqueous solution on the heating plate to form a film of 1-2mm, and set the temperature of the heating plate to 80°C to dehydrate the film; when the film loses 40wt% of water and falls off the heating plate, Use a bundle of carbon fiber bundles as a rolling rod to roll it into a roll to obtain a graphene oxide roll. The gap between layers of the graphene oxide roll is less than 1mm, and dry it in an oven at 80°C for 2 to 4 hours;

[0064] Step 3: Carbonize graphene oxide rolls in graphene rolls in a tube furnace, and the heating rate of the tube furnace is divided into three stages:

[0065] The first stage: keep graphene ...

Embodiment 2

[0073] refer to figure 1 , on the basis of Example 1, a graphene heat-conducting silica gel sheet is made, including graphene roll 1, heat-conducting silica gel 2 and carbon fiber bundle 3; graphene roll 1 is wound on the outside of carbon fiber bundle 3; heat-conducting silica gel 2 is bonded On the surface of the graphene roll 1 after tiling.

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Abstract

The invention discloses a graphene heat-conducting silica gel sheet and a preparation method thereof. The preparation method comprises the steps of preparation of a graphene oxide aqueous solution, preparation of a graphene oxide roll, preparation of a graphene roll film, preparation of a graphene sheet, preparation of a heat-conducting silica gel solution and preparation of a graphene heat-conducting silica gel roll. The graphene heat-conducting silica gel sheet prepared by the method has high viscosity, high heat conductivity and good tear resistance, and can meet various heat dissipation requirements.

Description

technical field [0001] The invention relates to the technical field of graphene heat-conducting materials, in particular to a graphene heat-conducting silica gel sheet and a preparation method thereof. Background technique [0002] With the development of the electronic information industry and the miniaturization and multifunctionalization of electronic devices, more powerful functions are integrated into smaller electronic components. Therefore, under high frequency operation, the heat dissipation of electronic devices is particularly important. The two solid surfaces between the electronic device and the heat sink have a certain roughness, that is, the surface is uneven, the actual contact area is only about 10% of the macro contact area, the rest are all voids, and the thermal conductivity of air is 0.025W / (mK), which greatly increases the thermal resistance and reduces the heat dissipation efficiency of electronic devices. To this end, it is necessary to paste a laye...

Claims

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Application Information

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IPC IPC(8): C09K5/14
CPCC09K5/14
Inventor 陈威于梦雪龙晴明杜鸿达
Owner 福建永安市永清石墨烯研究院有限公司
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