INSULATION COMPOSITION FOR DIRECT-CURRENT ULTRAHIGH VOLTAGE, PREPARATION METHOD, AND USES THEREOF

摘要

The present invention relates to an insulation composition for a direct-current ultrahigh voltage, a preparation method, and uses thereof. The composition comprises the following components: (A) graphene nanosheets; (B) layered metal double hydroxides; (C) a coupling agent; and (D) deionized water. The volume of the graphene nanosheets is 0.025vol% to 0.1vol% of that of the layered metal double hydroxides. The preparation method comprises: wet-milling graphene nanosheets and layered metal double hydroxides in a ball-milling machine, adding a coupling agent, and then dry-milling the mixture. The composite material of the present invention has excellent tracking resistance, electric corrosion resistance and flame retardance performance; mechanical performance of the material can be effectively improved; and the composite material can be used for preparing an insulation material for a direct-current ultrahigh-voltage power transmission line.