▎ 摘　　要

NOVELTY - Preparing polyimide composite material with double thermally conductive network comprises (i) mixing polyamic acid powder, water, triethylamine and first thermally conductive filler, freeze-drying the obtained mixed slurry, and performing thermal imidization to obtain thermally conductive filler-polyimide aerogel, and (ii) vacuum-impregnating the thermally conductive filler-polyimide aerogel in the thermally conductive filler slurry and then hot-pressing to obtain polyimide composite material with dual thermally conductive networks, where the components of the thermally conductive filler slurry include a second thermally conductive filler, an aqueous thickener and water. USE - The method is useful for preparing polyimide composite material with double thermally conductive network. ADVANTAGE - The polyimide composite material: has more dense thermal conductivity, and better heat conduction effect; can be improved in the case of low thermal filler content, solving the disadvantages of existing materials, and the application of polymer base composite materials in the field of electronic packaging; uses polyalide gas gel as supporting matrix, which can keep the composite material better mechanical properties and thermal stability, and meet the requirements of long term use at high temperatures. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for polyimide composite material with double thermally conductive network, comprising poly amine gas gel, first heating fillers distributed in the internal polyiline gas gel, and the second heating fillers attached to the surface of the polybacide gas gel channel.