▎ 摘　　要

NOVELTY - High thermal stability polyolefin composite insulating material comprises 98-99.5 wt.% polyolefin polymer and 0.5-2 wt.% modified graphene oxide filler. USE - High thermal stability polyolefin composite insulating material. ADVANTAGE - The polyolefin composite insulating material enhances interfacial bonding between polymer matrix and filler. It has long oxidation induction and low dielectric constant. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of high thermal stability polyolefin composite insulating material comprising dissolving polyolefin polymer matrix in toluene solution to obtain mixture A, dissolving modified graphene oxide in toluene solution to obtain mixture B, mixing mixtures A and B, casting film and drying.