▎ 摘　　要

NOVELTY - Preparing core-shell type nano ceramic powder based on graphene coating involves ultrasonically dispersing perylene-3,4,9, 10-tetracarboxylic acid in toluene, adding vinylamine, carrying out reflux reaction, cooling to room temperature after reaction is finished, filtering reaction solution, washing filtered precipitate with toluene and ethanol, drying, adding washed precipitate into potassium hydroxide solution, stirring at room temperature, filtering mixture, washing precipitate with deionized water, dissolving washed precipitate in formic acid after vacuum drying, adding isopropanol to carry out precipitation treatment, and carrying out vacuum drying on precipitate to obtain polyamino cationic perylene imide graphene dispersant; mixing and stirring prepared polyamino cationic perylene bisimide graphene dispersant and deionized water uniformly, then adding graphene, and carrying out ultrasonic treatment in ice bath to prepare modified graphene dispersion liquid. USE - Method for preparing core-shell type nano ceramic powder based on graphene coating used for modifying ceramic composite materials for good performance. ADVANTAGE - The method for preparing core-shell type nano ceramic powder based on graphene coating has simple operation, low cost, and good dispersibility. DETAILED DESCRIPTION - Preparing core-shell type nano ceramic powder based on graphene coating involves ultrasonically dispersing perylene-3,4,9, 10-tetracarboxylic acid in toluene, adding vinylamine, carrying out reflux reaction, cooling to room temperature after reaction is finished, filtering reaction solution, washing filtered precipitate with toluene and ethanol, drying, adding washed precipitate into potassium hydroxide solution, stirring at room temperature, filtering mixture, washing precipitate with deionized water, dissolving washed precipitate in formic acid after vacuum drying, adding isopropanol to carry out precipitation treatment, and carrying out vacuum drying on precipitate to obtain polyamino cationic perylene imide graphene dispersant; mixing and stirring prepared polyamino cationic perylene bisimide graphene dispersant and deionized water uniformly, then adding graphene, and carrying out ultrasonic treatment in ice bath to prepare modified graphene dispersion liquid; dissolving anionic surfactant in mixed solution of deionized water, adding nano ceramic powder, uniformly stirring, adjusting pH value of solution to 6, carrying out ultrasonic stirring reaction, filtering mixture, washing precipitate obtained by filtering, and drying to obtain modified nano ceramic powder; ultrasonically dispersing prepared modified nano ceramic powder in deionized water to prepare modified nano ceramic powder suspension; slowly dropwise adding modified nano ceramic powder suspension into modified graphene dispersion under condition of ultrasonic stirring, continuing stirring, standing, filtering, washing precipitate, and drying to obtain core-shell nano ceramic powder.