▎ 摘　　要

NOVELTY - Method for preparing graphene microsphere flame retardant masterbatch, involves (a) uniformly dispersing and suspending graphene powder in deionized water under the action of mechanical stirring and dispersant sodium hexametaphosphate, (b) continuously adding inorganic porous microspheres to obtained graphene aqueous dispersion, continuously stirring and dispersing, adding zinc sulfate, zinc oxide and borax, and uniformly stirring and dispersing, (c) heating obtained inorganic porous microsphere dispersion, dripping sodium carbonate solution, adjusting the pH value of the inorganic porous microsphere dispersion to 7-8, maintaining the temperature at 40 degrees C, stirring and reacting, spray drying, washing and drying the reaction product, and (c) uniformly mixing obtained inorganic porous microsphere-loaded graphene and zinc borate composite material with thermoplastic rubber, dispersant and lubricant in an internal mixer, transferring to a screw extruder, extruding and granulating. USE - The method is used for preparing graphene microsphere flame retardant masterbatch for rubber and plastic (claimed). ADVANTAGE - The method is simple and improves the mechanical strength and flame retardance effect of the rubber-plastic insulation material, and the obtained masterbatch has excellent dispersion performance. DETAILED DESCRIPTION - Method for preparing graphene microsphere flame retardant masterbatch, involves (a) uniformly dispersing and suspending graphene powder in deionized water under the action of mechanical stirring and dispersant sodium hexametaphosphate to obtain a graphene aqueous dispersion, where the mass ratio of graphene powder and sodium hexametaphosphate is (100-110):(10-20), and mechanically stirring at 140-180 rpm for 40-85 minutes, (b) continuously adding inorganic porous microspheres to obtained graphene aqueous dispersion, continuously stirring and dispersing for 5-30 minutes, adding zinc sulfate, zinc oxide and borax, and uniformly stirring and dispersing to obtain an inorganic porous microsphere dispersion, (c) heating obtained inorganic porous microsphere dispersion at 40 degrees C, dripping 10% sodium carbonate solution at 40 degrees C, adjusting the pH value of the inorganic porous microsphere dispersion to 7-8, maintaining the temperature at 40 degrees C, stirring and reacting for 1 hour, spray drying, washing and drying the reaction product to obtain the inorganic porous microsphere-loaded graphene and zinc borate composite material, where the zinc borate encapsulates the graphene in inorganic porous microsphere pores, the inorganic porous microsphere comprises porous glass microsphere and/or porous ceramic microsphere, and the mass ratio of graphene powder, inorganic porous microsphere, zinc sulfate, zinc oxide and borax is (1-2):(10-25):(5-12):(1-8):(4-13), and (c) uniformly mixing obtained inorganic porous microsphere-loaded graphene and zinc borate composite material with thermoplastic rubber, dispersant and lubricant in an internal mixer, transferring to a screw extruder, extruding and granulating to obtain the masterbatch.