▎ 摘　　要

NOVELTY - Modifying graphene, comprises mixing graphene oxide, silicate, inorganic alkali solution, water-soluble polymer compound and surfactant, and reacting at 10-50 degrees C for 0.1-10 hours, collecting solid product and drying to obtain a modified graphene. The surfactant is a cationic surfactant, an anionic surfactant, a nonionic surfactant and/or a zwitterionic surfactant. USE - The modified graphene is useful for in heat conductive composition, graphene composite heat dissipating material composition and #graphene composite material composition (all claimed) and as phase change energy storage material and heat dissipation material. ADVANTAGE - The method improves thermal conductivity and surface properties of graphene and reduce electrical conductivity. The modified graphene has high thermal conductivity, high heat absorption and heat dissipation efficiency, low conductivity, excellent insulation performance, weather resistance, wear resistance and chemical stability, long service life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) modified graphene prepared by the above method; (2) heat conductive composition (C1) comprising 100 pts. wt. a silicone oil, 10-60 pts. wt. a first filler, 50-150 pts. wt. a second filler and 0-20 pts. wt. optionally auxiliary agent, where the first filler comprises a metal heat conducting material and a phase change material in weight ratio of 1:(0.2-2.5), and the second filler is carbon nanotubes and the above modified graphene in weight ratio of 1:(1-20); (3) graphene composite heat dissipating material composition (C2) comprising 100 pts. wt. a fluoropolymer, 5-25 pts. wt. the above modified graphene, 4-15 pts. wt. a carbon nanotube, 0.1-8 pts. wt. a metal heat conducting material and 0-90 pts. wt. an optionally additive; and (4) graphene composite material composition (C3) comprising a phase change main material, 5-40 pts. wt. the above modified graphene, 1-20 pts. wt. carbon nanotubes, 5-40 pts. wt. metal thermally conductive particles and 2-30 pts. wt. a composite material auxiliary agent, where the composite material auxiliary agent is an organic-silica composite material.