▎ 摘　　要

NOVELTY - High thermal conductivity silicone gel sheet comprises substrate and composition. Where the composition comprises component A and component B. The component A comprises vinyl-terminated polysiloxane. The component B comprises 0-20 pts. wt. thermally conductive filler, 3-10 pts. wt. side-chain vinyl polysiloxane coupling agent, 75-85 pts. wt. side-chain containing silicon-hydrogen-based polysiloxane, 0.05-0.2 pts. wt. catalyst and 0.05-0.2 pts. wt. inhibitor. The composition is sequentially coated, calendering and thermosetting molding on the substrate. The molar ratio of the vinyl group of the vinyl-terminated polysiloxane to the silanyl group of the side-chain containing silicon-hydrogen-based polysiloxane is 1:1-1:3. USE - Used as high thermal conductivity silicone gel sheet. ADVANTAGE - The gel sheet has evenly distributed thermal conductive filler in the gel molecular grid, has fixed structure, high efficiency, uniform thermal conductivity, long service life and high strength, and is easy to peel, fit and rework and reattach. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing high thermal conductivity silicone gel sheet, comprising (i) preparing side chain silicone-hydrogen group-containing polysiloxane with thermally conductive filler as follows: (1.1) pouring the thermally conductive filler into toluene, stirring under heating in oil bath at 50-80 degrees C, adding the side chain vinyl polysiloxane coupling agent, stirring, adding deionized water, stirring to initiate the side chain vinyl polysiloxane coupling agent to hydrolyze, coating the surface of the thermally conductive filler, completing the hydrolysis, filtering, removing particulate matter of the side chain vinyl polysiloxane coupling agent coated with the thermally conductive filler obtained by the filtration, washing with deionized water and absolute ethanol successively, placing the particulate matter in blast drying box for blast drying, using the GC headspace method to test the moisture content of the dried particulate matter, and controlling the moisture content of the particulate matter to not less than 50 ppm, and (1.2) stirring and mixing the dried particles, catalyst and polysiloxane containing hydrosilyl groups in the side chain, and obtaining side chain polysiloxane containing silanyl hydrogen groups loaded with thermally conductive fillers, (ii) preparing component B as follows: stirring and mixing the side chain silicone-hydrogen group-containing polysiloxane containing the thermally conductive filler, and inhibitor to obtain component B, (iii) preparing high thermal conductivity silicone gel sheet as follows: providing vinyl-terminated polysiloxane of component A and component B, stirring and mixing in ice-water bath to obtain AB mixture, vacuuming the obtained AB mixture in rotary evaporator, coating the AB mixture on the substrate on the coating machine, and heating in hot drying tunnel to obtain high thermal conductivity silicone gel sheet, and adding vinyl-terminated polysiloxane, side-chain vinyl polysiloxane coupling agent, thermally conductive filler, side chain silicone-hydrogen group-containing polysiloxane, catalyst and the inhibitor.