▎ 摘　　要

NOVELTY - A carbon material comprises a composite carbon material comprising carbon nanotubes and graphene. The surface of the carbon nanotubes is grafted and modified with silane coupling agent I. The surface of the graphene is grafted and modified by silane coupling agent II. The carbon nanotubes and graphene are chemically connected through the silane coupling agent I and the silane coupling agent (II). USE - Carbon material used for conductive filler for forming plastic composite material (all claimed). ADVANTAGE - The carbon material has microstructure in which graphene and carbon nanotubes are respectively grafted and modified by silane coupling agent, and then closely chemically combined, so that the graphene and carbon nanotubes can be well dispersed in the polymer and fully overlapped simultaneously, thereby exerting the synergistic effect of the graphene and carbon nanotubes, and efficiently constructing a conductive network. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of carbon material, which involves (i) acidifying the carbon nanotubes and modifying the silane coupling agent I to obtain modified carbon nanotubes, (ii) acidifying the graphene and modifying the silane coupling agent II to obtain modified graphene and (iii) reacting the solution containing the modified carbon nanotubes and the modified graphene. The step (i) is performed by (i-1) acidifying the carbon nanotubes to obtain acidified carbon nanotubes, (i-2) dissolving silane coupling agent I in solvent (S1) and hydrolyzing to obtain a carbon nanotube modification solution and (i-3) adding the acidified carbon nanotubes to the carbon nanotube modification solution for modification to obtain the modified carbon nanotubes. The step (ii) is performed by (ii-1) acidifying graphene to obtain acidified graphene, (ii-2) dissolving silane coupling agent II in solvent II and hydrolyzing to obtain graphene modified solution and (ii-3) adding the acidified graphene to the graphene modification solution and modifying it to obtain the modified graphene. The step (iii) is performed by (iii-1) obtaining a slurry containing modified carbon nanotubes and modified graphene, (iii-2) adding a surfactant to the slurry to obtain a reaction slurry, and (iii-3) heating and reacting the reaction slurry; (2) conductive filler, which comprises the carbon material; and (3) plastic composite material, which comprises a plastic polymer and the conductive filler.