▎ 摘　　要

NOVELTY - Method for preparing thermally conductive gasket, involves (a) using graphite film or graphene film as filler, and performing plasma modification to obtain first modified graphite film or graphene film, (b) performing hydroxylation on first modified graphite film or graphene film, washing first modified graphite film or graphene film to neutral, and grafting hydrolyzed coupling agent to obtain second modified graphite film or graphene film, (c) using bi-component polyolefin containing coupling agent and antioxidant as polymer substrate, coating the surface of second modified graphite film or graphene film with two-component polyolefin containing coupling agent and antioxidant, and performing pre-curing treatment, and (d) hot-pressing obtained graphite film or graphene film/polyolefin multilayer composite structure to heat-conducting gasket in direction perpendicular to upper surface and lower surface of multi-layer composite structure forming portion. USE - Method for preparing thermally conductive gasket. ADVANTAGE - The thermal conductive gasket has excellent thermal conductivity and high elasticity, and when the filler content reaches 94.3%, ensures a thermal conductivity as high as 726.1 W/(m.K). DETAILED DESCRIPTION - Method for preparing thermally conductive gasket, involves (a) using graphite film or graphene film as filler, and performing plasma modification to obtain first modified graphite film or graphene film, (b) performing hydroxylation on first modified graphite film or graphene film, washing first modified graphite film or graphene film to neutral, and grafting hydrolyzed coupling agent to obtain second modified graphite film or graphene film, (c) using bi-component polyolefin containing coupling agent and antioxidant as polymer substrate, coating the surface of second modified graphite film or graphene film with two-component polyolefin containing coupling agent and antioxidant, and performing pre-curing treatment to obtain composite film comprising second modified graphite film or graphene film and two-component polyolefin after completing pre-curing treatment using lamination process to obtain graphite film or graphene film/polyolefin multilayer composite structure molded portion, and (d) hot-pressing obtained graphite film or graphene film/polyolefin multilayer composite structure to heat-conducting gasket in direction perpendicular to upper surface and lower surface of multi-layer composite structure forming portion.