High-thermal-conductivity and insulating polymer composite material and preparation method thereof

The invention discloses a high-thermal-conductivity and insulating polymer composite material which comprises the following components by mass percent: 60-90% of polyvinylidene fluoride and 10-40% of hybrid filler, wherein the hybrid fillers are ceramic thermal-conductive filler-grapheme hybrids; and the mass ratio of grapheme to ceramic thermal-conductive fillers is 1:(2-200). The invention further comprises a preparation method of the high-thermal-conductivity and insulating polymer composite material. A ceramic thermal-conductive filler-grapheme sandwich structure hybrid is obtained in an electrostatic self-assembly way, and then the high-thermal-conductivity and insulating polymer composite material is obtained through in-situ reduction; and compared with a conventional solvent blending method, the thermal conductivity is improved remarkably. The sandwich structure hybrid can form a thermal-conductive passage and can maintain the insulativity of the composite material. Therefore, the composite material has higher thermal conductivity and insulativity under low filler content, thereby having an important applicant value.