▎ 摘　　要

NOVELTY - Preparing composite heat-conducting filler comprises (a) adding titanium source and/or silicon source and hydrolysis inhibitor into a sheet-shaped heat conducting filler dispersion, hydrolyzing to obtain nano-sol particle sheet-shaped heat conducting filler, (b) mixing ceramic particles and nano-sol particle sheet-shaped heat conducting filler, performing heat treatment to obtain core-shell structure heat conducting filler and (c) mixing the core-shell structure heat conducting filler with high heat conducting filler to obtain composite heat-conducting filler, where in the step (a) the sheet diameter of the sheet-shaped heat conducting filler in the sheet-shaped heat conducting filler dispersion is 0.5-20 µm, the average particle size of the ceramic particles in the step (b) is 1-100 µm and the average particle size of the high heat conducting filler in step (c) is 0.1-20 µm. USE - The composite heat-conducting filler is useful in preparing polymer composite material, preferably phenolic resin, epoxy resin, cyanate resin, polyphenylsulfone resin, polyethersulfone resin, polycarbonate resin, polyurethane resin, silicone resin, polyurethane resin, siloxane resin, polyolefin resin, polyimide resin, polyaryl ketone resin, polyaryletherketone resin, polybutadiene resin, polyisoprene resin, silicone oil and silicone rubber (claimed). ADVANTAGE - The filler is economical, easy to disperse in the polymer composite material; has excellent mechanical property and heat conducting property and has better compatibility with the polymer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a composite heat-conducting filler, which is prepared by the above method.