▎ 摘　　要

NOVELTY - Preparing thermally conductive filler for highly thermally conductive elastomer comprises (1) uniformly mixing the modified hyperbranched polyester and deionized water, adding aluminum chloride solution under stirring, adjusting the pH value of the solution to 10, heating to reflux, stirring for 3-4 hours, cooling to room temperature, allowing to stand for aging, precipitating and washing, and drying to obtain composite thermally conductive material, (2) adding graphene oxide to ethanol, and vacuum-drying to obtain the grafted graphene oxide, and (3) adding the composite thermally conductive material and the grafted graphene oxide to the mixed solvent of ethanol and water, ultrasonically dispersing for 20-40 minutes, and drying to obtain a thermally conductive filler for highly thermally conductive elastomer. USE - The method is useful for preparing thermally conductive filler for highly thermally conductive elastomer. ADVANTAGE - The composite thermally conductive material is a modified hyperbranched polyester-supported aluminum hydroxide thermally conductive material, which contains a thermally conductive network composed of aluminum hydroxide and mesogens, and the grafted graphene oxide is assembled on the surface of the composite thermally conductive material, so that the obtained thermally conductive filler has high thermal conductivity. DETAILED DESCRIPTION - Preparing thermally conductive filler for highly thermally conductive elastomer comprises (1) uniformly mixing the modified hyperbranched polyester and deionized water, adding aluminum chloride solution under stirring, adjusting the pH value of the solution to 10, heating to reflux, stirring for 3-4 hours, cooling to room temperature, allowing to stand for aging, precipitating and washing, and drying to obtain composite thermally conductive material, (2) adding graphene oxide to ethanol, ultrasonically dispersing for 20-40 minutes, then heating to 40-60°C, slowly adding aminosiloxane dropwise, after the dropwise addition is complete, stirring and reacting for 2-4 hours, stopping the reaction, filtering, washing, and vacuum-drying to obtain the grafted graphene oxide, and (3) adding the composite thermally conductive material and the grafted graphene oxide to the mixed solvent of ethanol and water, ultrasonically dispersing for 20-40 minutes, then grinding for 1-1.5 hours, then transferring to the reaction vessel, adding hydrazine hydrate, stirring and reducing at room temperature for 6-24 hours, after allowing to stand for aging, precipitating, washing, and drying to obtain a thermally conductive filler for highly thermally conductive elastomer.