▎ 摘　　要

NOVELTY - Preparation of modified ultrafine graphene involves placing graphene in a grinder, adding deionized water and super-dispersant, grinding for 20 hours to obtain a graphene slurry material, placing resulting material in a high-speed centrifugal classifier, concentrating graphene material having particle size of 1 mu m or less in the middle of the classifier, storing in a storage tank, and kneading the resulting material with a surface treatment agent to obtain ultrafine graphene powder having bulk density of 0.5-1.2. USE - Preparation of modified ultrafine graphene (claimed). ADVANTAGE - The modified ultrafine graphene having excellent dispersibility and low packing density is produced.