▎ 摘　　要

NOVELTY - A silicone pad comprises 100 parts mass active silicone oil, 5-15 parts mass temperature-resistant-enhanced crosslinking agent, 0-3 parts mass foaming agent, 0.1-5 parts mass crosslinking reaction regulator, 0.1-10 parts mass coupling agent, 1-8 parts mass heat stabilizer, 100-500 parts mass liquid metal, and 200-800 parts mass thermal powder. The active silicone oil is silicone oil containing reactive groups such as vinyl, hydroxyl, epoxy, and hydrogen in the molecule, and comprises norbornene-modified hydrogen-containing silicone oil. The temperature-resistant enhanced crosslinking agent is chosen from boric acid, or its ester, cyanate ester monomer, and diisopropoxy aluminate. The heat stabilizer is chosen from nanocerium oxide, nanoyttrium oxide, nanoneodymium oxide, and nanolanthanum oxide. The liquid metal comprises liquid metal powder. USE - Silicone pad used for dissipating heat of electronic components and modules. ADVANTAGE - The inert dimethyl silicone oil-free silicone pad has excellent heat resistance, thermal conductivity, and reduced oil penetration, compressibility, and resilience, and is manufactured environmentally-friendly with reduced precipitation of silicone oil. DETAILED DESCRIPTION - A silicone pad comprises 100 parts mass active silicone oil, 5-15 parts mass temperature-resistant-enhanced crosslinking agent, 0-3 parts mass foaming agent, 0.1-5 parts mass crosslinking reaction regulator, 0.1-10 parts mass coupling agent, 1-8 parts mass heat stabilizer, 100-500 parts mass liquid metal, and 200-800 parts mass thermal powder. The active silicone oil is silicone oil containing reactive groups such as vinyl, hydroxyl, epoxy, and hydrogen in the molecule, and comprises norbornene modified hydrogen-containing silicone oil. The temperature-resistant enhanced crosslinking agent is chosen from boric acid, or its ester, cyanate ester monomer, and diisopropylaluminum ethyl acetoacetate. The heat stabilizer is chosen from nanocerium oxide, nanoyttrium oxide, nanoneodymium oxide, and nanolanthanum oxide. The liquid metal comprises liquid metal powder. The preparation of the liquid metal powder involves melting the liquid metal alloy in hydroxysilicone oil with viscosity of 1000 cP.second, and using a high-speed disperser of 4000-30000 rpm for performing shear dispersion, in which the surface tension of liquid metal is much greater than hydroxy silicone oil, melting the liquid metal into liquid microbeads with diameter of 10-200 mu m, keeping the dispersion speed, cooling to room temperature while dispersing, and filtering liquid. An INDEPENDENT CLAIM is included for preparation of silicon pad, which involves melting liquid metal alloy in a hydroxy silicone oil with a viscosity of 1000 cP.second, and a dispersing at high-speed dispersing machine of 4000-30000 rpm, melting liquid metal into liquid beads having bead diameter of 10-200 mu m, cooling to room temperature while dispersing, filtering, and testing the particle size with a laser particle size analyzer, when does not reach the required particle size, adjusting the dispersion speed and time to melt, dispersing, cooling, filtering, to obtain liquid metal powder, (2) stirring the active silicone oil, heat-resistant crosslinking agent, foaming agent, crosslinking reaction regulator, coupling agent, and heat stabilizer in a double planetary mixer or kneader evenly at a mixing speed of 30-40 rpm, gradually adding liquid metal and thermal powder and mixing uniformly to obtain a thermally conductive slurry at a stirring speed of 10-30 rpm, and calendaring the thermally conductive slurry through a two-roll calender to obtain a preformed thermally conductive silicone gasket with a thickness of 0.1-20 mm, vulcanizing at 40-200 degrees C to obtain a silicone pad, (3) during the vulcanization process, slightly lowering the foaming temperature than the vulcanization temperature, and less than the melting point of the liquid metal such that the gel forms large pores to form a compression rate before the gel.