▎ 摘　　要

NOVELTY - Composite material comprises polyethylene, graphene, coupling agent, reactive additive, antioxidant and mold release agent, where amount of polyethylene is 100 pts. wt., graphene is 0.05-10 pts. wt., antioxidant is 0.1-0.4 pts. wt., mold release agent is 0.2-2 pts. wt., coupling agent is 0.01-0.2 wt.% the graphene, and reactive additive is 0.01-0.1 wt.% graphene. USE - The composite material is useful in building space thermal conductive network. ADVANTAGE - The composite material has high thermal conductivity and heat resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing composite material comprising (i) formulating coupling agent, ethanol and water into solution, adjusting the pH of the solution using acetic acid to obtain coupling agent solution, adding graphene into high-speed mixer, then spraying coupling agent solution on graphene, and stirring to obtain surface-modified graphene, drying surface-modified graphene to obtain purified surface-modified graphene, (ii) adding polyethylene, surface-modified graphene, reactive additive, antioxidant and release agent into mixer for stirring to obtain mixture, and (iii) adding mixture into extruder, performing reaction extrusion, cooling and pelletizing to obtain final product.