Preparation method of heat conductive silicone rubber slice

Abstract

The invention relates to the technical field of heat conductive electronic material preparation, in particular to a preparation method of a heat conductive silicone rubber slice. The preparation method comprises the following steps of by taking an ethylene-vinyl acetate copolymer, a heat conductive graphite slice, EPS foam particles and vinyl ester resin as raw materials to prepare a foaming sheet, mixing the ethylene-vinyl acetate copolymer, glass fibers, expanded graphite powder and the like, performing heating to obtain glass fiber resin, coating the surface of the foaming sheet with the glass fiber resin for hot pressing vulcanization to obtain the heat conductive silicone rubber slice. In the preparation method, a polar group and an active group in epoxidized soybean oil enable acrylate matrix resin to express excellent bonding strength, electrical insulation performance and high temperature resistance; a benzene ring structure of the EPS foam particles endow the matrix resin withheat resistance and rigidity, and the effect that the viscosity cannot be lowered at high temperature is achieved; through the coupling effect, the compatibility of the graphite slice and the ethylene-vinyl acetate copolymer is improved; and through expanded and relaxed heat conductive graphite slice, the heat conductive area of the silicone rubber slice is increased, and the silicone rubber slice has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of thermally conductive electronic materials, in particular to a method for preparing a thermally conductive silica gel sheet. Background technique [0002] Thermally conductive silica gel sheet is a thermally conductive medium material synthesized by a special process with silica gel as the base material, adding various auxiliary materials such as metal oxides. In the industry, it is also known as heat-conducting silicone pad, soft heat-conducting pad, etc., which are specially designed for the use of gaps to transfer heat. It can fill the gaps and complete the heat transfer between the heating part and the cooling part. The function of shock absorption and sealing can meet the design requirements of equipment miniaturization and ultra-thinning. It is extremely manufacturable and usable, and has a wide range of thickness. It is an excellent thermal conductivity filling material. [0003] At ...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention is aimed at the poor thermal conductivity of the entire heat-conducting silica gel sheet due to the low contact density and thermal conductivity coefficient of the heat-conducting silica gel sheet at present, and the heat-conducting silica gel sheet is easy to Aging pyrolysis leads to the defect that its viscosity decreases, and a preparation method for thermally conductive silica gel sheet is provided

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