▎ 摘　　要

NOVELTY - A graphene-modified magnetic composite material comprises polylactic acid, bulk acrylonitrile-butadiene-styrene, emulsion acrylonitrile-butadiene-styrene, styrene-acrylonitrile-glycidyl methacrylate copolymer, butyltriphenylphosphonium bromide, composite filler, magnetic composite material and multi-walled carbon nanotubes/nano-silver/silver dioxide antibacterial material, graphene quantum dot and porous graphene. The magnetic composite material is made of graphene/iron oxide powder and multi-walled carbon nanotubes/neodymium-iron-boron powder. USE - Graphene-modified magnetic composite material (claimed). ADVANTAGE - The graphene-modified magnetic composite material has excellent antibacterial effect and mechanical property. DETAILED DESCRIPTION - A graphene-modified magnetic composite material comprises 40-50 pts. wt. polylactic acid, 20-25 pts. wt. bulk acrylonitrile-butadiene-styrene, 10-20 pts. wt. emulsion acrylonitrile-butadiene-styrene, 5-10 pts. wt. styrene-acrylonitrile-glycidyl methacrylate copolymer, 0.01-0.05 pt. wt. butyltriphenylphosphonium bromide, 5-10 pts. wt. composite filler, 15-30 pts. wt. magnetic composite material and 0.1-1 pt. wt. multi-walled carbon nanotubes/nano-silver/silver dioxide antibacterial material, graphene quantum dot and porous graphene. The magnetic composite material is made of graphene/iron oxide powder and multi-walled carbon nanotubes/neodymium-iron-boron powder in weight ratio of 3:2. The composite filler comprises graphene/silicon dioxide composite filler and graphene/calcium carbonate composite filler in weight ratio of 3:1. The graphene quantum dots comprise 0.5-1 wt.% polylactic acid. The content of porous graphene is 0.1-2 wt.% with respect to total content of acrylonitrile-butadiene-styrene. The magnetic composite material is obtained by pulverizing polylactic acid raw material to product having particle size of 300 mesh, dispersing resultant in pure water, ultrasonically processing for 1 hour, irradiating using microwave, washing, discharging, drying, obtaining pretreated polylactic acid, dispersing composite packing in pure water, ultrasonically stirring, obtaining composite filler solution, heating, dissolving pretreated polylactic acid in an organic solvent, stirring, adding composite filler solution, dripping graphene-quantum dot solution, ultrasonically stirring for 30-60 minutes, obtaining polylactic acid mixture, adding resultant to a reserve tank of a spray dryer, drying, obtaining polylactic acid/filler masterbatch, mixing emulsion acrylonitrile-butadiene-styrene, bulk acrylonitrile-butadiene-styrene and multi-walled carbon nanotubes/neodymium-iron-boron powder, stirring for 30-60 minutes, spray-drying, cooling, obtaining graphene-modified acrylonitrile-butadiene-styrene/antibacterial masterbatch, mixing resultant with polylactic acid/filler masterbatch, styrene-acrylonitrile-glycidyl methacrylate copolymer and butyltriphenylphosphonium bromide, extruding at 185 degrees C using a twin screw extruder and molding resultant material by three-dimensional printing.