▎ 摘　　要

NOVELTY - A polycarbonate composite material comprises 50-80 pts. wt. polycarbonate, 10-20 pts. wt. magnesium borate crystal whisker, 3-5 pts. wt. graphene oxide, 0.2-0.5 pt. wt. coupling agent, and 0.1-0.5 pt. wt. heat stabilizer. The average molecular weight of polycarbonate is 14,000 to 30,000. The moisture content in polycarbonate is less than or equal to 0.02%. The magnesium borate crystal whisker diameter is 0.5-2 mu m and length is 20-40 mu m. The particle size of graphene oxide is 1-10 mu m. USE - Polycarbonate composite material for three-dimensional printing (claimed). ADVANTAGE - The composite material surface is more spherical with liquidity, effectively prevents powder reunion and is suitable for three-dimensional printing material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of polycarbonate composite material, (1) adding magnesium borate crystal whisker, graphene oxide and water to the container, ultrasonically dispersing for 3-5 minutes to form suspension, dissolving coupling agent in ethanol to form solution containing 20% ethanol, mixing suspension with solution of coupling agent, heating at 40-60 degrees C, stirring for 20-40 minutes, filtering, vacuum drying to obtain modified materials, (2) adding modified materials with polycarbonate and heat stabilizer, mixing with a high-speed mixer for 10-20 minutes, melting and plasticizing in twin screw extruder, cutting, pelletizing, obtaining polycarbonate composite particles, (3) pulverizing to obtain a powder of 50-100 mu m, immersing powder in aqueous solution of polyelectrolyte, modifying powder surface through fluidization bed, and drying to obtain spherical polycarbonate composite material, where polyelectrolyte solution contains 0.05-0.1 mol/l poly allyl chloride or poly(ethyleneimine) solution.