Low-filling-capacity and high-heat-conductivity graphene/silicone grease composite material and preparation method thereof

A technology of high thermal conductivity graphite and low filling amount, which is applied in the field of low filling amount and high thermal conductivity graphene/silicone grease composite material and its preparation field, can solve the problems of affecting heat dissipation effect, affecting the fluidity of silicone grease, low thermal conductivity, etc. The effect of improving reliability and service life, reducing interface contact thermal resistance, and simple preparation process

Active Publication Date: 2014-04-30
GUANGDONG UNIV OF TECH
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  • Abstract
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Problems solved by technology

The thermal conductivity of the thermally conductive silicone grease prepared by this method is relatively low, generally only 0.6-0.9W/(m·K), and the product performance is relatively poor
On the other hand, due to the relatively low thermal conductivity of metal oxides, the filling amount of fillers in the prepared silicone grease is relatively large (100-1000 parts), which affects the fl

Method used

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  • Low-filling-capacity and high-heat-conductivity graphene/silicone grease composite material and preparation method thereof
  • Low-filling-capacity and high-heat-conductivity graphene/silicone grease composite material and preparation method thereof

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Embodiment Construction

[0022] For better illustrating the present invention, facilitate understanding technical scheme of the present invention, the typical but non-restrictive implementation of the present invention is as follows:

[0023] Concrete processing steps of the present invention are:

[0024] (1) Preparation of reduced graphene oxide sheets: Add 5g of natural flake graphite into 115ml of concentrated sulfuric acid, stir well and add 15g of KMnO 4 , Stir at a low speed for 2.5 hours in a low-temperature and constant-temperature water bath at 3-5°C, then continue stirring for 2 hours in a constant-temperature water bath at 30-35°C, then raise the temperature of the constant-temperature water bath to 80°C and continue stirring; in the range of 60-70°C Inside, when the color of the sample is brownish red, add 250ml of deionized water dropwise at a constant speed. At this time, the color of the sample turns bright red, and then add 50ml of H 2 o 2 Until the color of the sample completely tu...

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Abstract

The invention discloses a low-filling-capacity and high-heat-conductivity graphene/silicone grease composite material and a preparation method thereof. Heat-conductive silicone grease is prepared by filling functional reduction-oxidation graphene sheet with silicone oil. The preparation method of the composite material comprises the following steps: preparing the functional reduction-oxidation graphene sheet as heat-conductive filler; sufficiently mixing the modified heat-conductive filler and dimethicone matrix in a double-roller open mill to uniformly disperse the functional reduction-oxidation graphene sheet in the silicone oil matrix. The heat-conductive silicone grease provided by the invention can be used for effectively avoiding the contacting gap between a high-power electronic component heating element and a heat radiation device, so that the interface contact thermal resistance can be reduced, a high-efficiency heat radiation passage is formed, and heat transfer is accelerated; the silicone grease is beneficial to encapsulation and radiation of the high-power electronic components, can be used for improving the reliability of the electronic component products and prolonging the service life of the products, and is simple in preparation process.

Description

technical field [0001] The invention relates to a graphene / silicon grease composite material with low filling amount and high thermal conductivity used for encapsulating and dissipating heat of high-power electronic components and a preparation method thereof. Background technique [0002] Thermally conductive silicone grease, also known as thermally conductive paste, is a high thermally conductive silicone material that can maintain the grease state during use at a temperature of -50°C to 300°C for a long time. In the application of heat dissipation and heat conduction, even two planes with very smooth surfaces will have gaps when they are in contact with each other, and the air in the gaps is a poor conductor of heat, which will hinder the conduction of the heat emitted by the heating element to the heat sink. Use thermal conductive silicone grease to fill the contact interface between heating elements of high-power electronic components (LED chips, computer CPUs, high-pow...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K9/06C08K9/04C08K9/00C08K3/04
Inventor 张海燕张琇滨林锦李春辉
Owner GUANGDONG UNIV OF TECH
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