▎ 摘　　要

NOVELTY - Preparing thermal insulation microspheres involves placing graphene oxide microspheres at 1300 degrees C or higher for 5 minutes or more under atmosphere of inert gas. The graphene microsphere is dispersed into ethyl orthosilicate after sintering, and the orthoethyl silicate is dispersed with graphene microspheres as precursor. Under stirring conditions, the graphene microspheres are coated with silica layer. Stirring is stopped and the graphite microsphere of collecting reaction liquid surface covered with silicon dioxide. USE - Method for preparing microspheres. ADVANTAGE - The microsphere uses graphene as a template to prepare ultra-low-density graphene-based silica microspheres. The thermal conductivity of the microspheres is reduced to less than 0.02 watt/meter-kelvin, which has excellent heat insulation effect.