Preparing method for graphene metal heat conduction gasket

A heat-conducting gasket, graphene technology, applied in heat exchange materials, chemical instruments and methods, lighting and heating equipment, etc. blocking effect

Active Publication Date: 2017-06-09
YAHAM OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As high thermal conductivity materials, graphene and metals are widely used as heat conduction and heat dissipation materials. In recent years, there have been many reports on the composite preparation of graphene and metal foam to prepare graphene metal composite materials. These composite methods include the use of chemical vapor deposition ( CVD method) (for example: patent 201510980259.1 "A method for rapidly growing graphene flower cluster array on nickel foam" and patent 201010183833.8 "graphene

Method used

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preparation example Construction

[0025] The preparation method of the graphene metal thermal pad of the embodiment of the present invention comprises the following steps:

[0026] (1) Preparation of graphene oxide dispersion: disperse the graphene oxide prepared by the Hummer method in one or more mixtures of water, absolute ethanol, DMF, NMP, etc., and use titanic acid coupling agent, silane One or several modifying agents in coupling agent, surfactant, amphiphilic polymer, etc. are used for surface treatment, aiming to obtain 5-20mg / ml high-concentration graphene dispersion liquid, and graphene oxide The dispersion liquid is prepared to be acidic, and its pH value is 2-6;

[0027] (2) Pretreatment is carried out to the porous metal foam: select the foam metal (nickel, copper, aluminum, iron and other simple metals or alloy metals) of different thicknesses and porosity, the thickness of the foam metal is preferably 0.5-10mm, the aperture (single wire diameter) is preferably 0.01-2 mm. The metal foam is com...

Embodiment 1

[0031] Graphene oxide prepared by the Hummer method was used as the loading precursor, and nickel foam with a thickness of 2 mm and a pore size of 0.05 mm was used as the substrate.

[0032] (1) Preparation of graphene oxide dispersion: disperse graphene oxide prepared by Hummer method in NMP solvent, add 0.5 mg of polyvinylpyrrolidone (CAS No. 25249-54-1) in the solution as a modifier Carry out surface modification treatment, prepare 8 mg / ml graphene oxide dispersion liquid, and add concentrated hydrochloric acid dropwise to make the graphene oxide solution acidic, make it PH=3;

[0033] (2) Pretreatment is carried out to the porous nickel foam: the selected foam nickel is completely immersed in a mixed solution containing sodium dichromate, magnesium sulfate, manganese sulfate and water according to the mass ratio of 12:7:6:85, Immerse at room temperature for 20 minutes, then wash with distilled water for more than 5 times, and finally place it in an electric heating constan...

Embodiment 2

[0039] Graphene oxide prepared by the Hummer method was used as the loading precursor, and nickel foam with a thickness of 1 mm and a pore size of 0.05 mm was used as the substrate.

[0040] (1) Preparation of graphene oxide dispersion: disperse graphene oxide prepared by Hummer method in NMP solvent, add 0.5 mg titanate coupling agent (Sinopharm Reagent, product number 391750703) as a modifier to modify its surface For sexual treatment, prepare a 5 mg / ml graphene oxide dispersion, and add concentrated hydrochloric acid dropwise to make the graphene oxide solution acidic, making it PH=3;

[0041] (2) Pretreatment is carried out to the porous nickel foam: the selected foam nickel is fully immersed in a solution that is composed of sodium dichromate, magnesium sulfate, manganese sulfate and water according to the mass ratio of 12:7:6:85. Immerse at room temperature for 20 minutes, remove and polish the metal nickel surface film layer, then wash with distilled water for more than...

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Abstract

The invention discloses a preparing method for a graphene metal heat conduction gasket. The preparing method includes the following steps that firstly, a graphene oxide dispersion solution is prepare, graphene oxide is dispersed into a solvent, a modifying agent is used for conducting surface treatment on the graphene, and the graphene oxide dispersion solution is mixed to be acid; secondly, foam metal is pretreated, wherein an oxide layer is formed on the surface of the foam metal through electrochemical oxidation; thirdly, the graphene-loaded foam metal is prepared, wherein the graphene oxide dispersion solution and a reducing agent are mixed into a mixed solution, the foam metal is immersed in the mixed solution, and sealing heat treatment is conducted under the temperature ranging from 80 DEG C to 350 DEG C; and fourthly, the graphene heat conduction gasket is prepared, wherein after the graphene-loaded foam metal is filled with a paste heat conduction material, the heat conduction material is cured, and the graphene-loaded foam metal filled with the heat conduction material is pressed into a sheet. The obtained graphene metal heat conduction gasket is high in heat conduction coefficient and can be well applied to large-power LED illumination lamps.

Description

[0001] [technical field] [0002] The invention relates to the preparation of heat-conducting materials, in particular to a method for preparing a graphene metal heat-conducting pad. [0003] [Background technique] [0004] As the power of LEDs increases, the problem of heat dissipation becomes more and more serious, which seriously affects the light output characteristics of LEDs and the life of devices. Therefore, heat dissipation has always been a key problem that must be solved for high-power LED packaging. In order to better fill the air gap between the heating element and the heat sink, it is necessary to select a material with good flexibility and thermal conductivity for filling to meet its heat dissipation effect. As high thermal conductivity materials, graphene and metals are widely used as heat conduction and heat dissipation materials. In recent years, there have been many reports on the composite preparation of graphene and metal foam to prepare graphene metal comp...

Claims

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Application Information

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IPC IPC(8): F21V29/85C09K5/06C25D11/02F21Y115/10
Inventor 林菊香黄裔裔陈文冰叶恩洲张新庆
Owner YAHAM OPTOELECTRONICS CO LTD
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