▎ 摘　　要

NOVELTY - Preparation method of graphene masterbatch involves (a) mixing and oscillating porous microsphere with surfactant and carrying out surface modification, (b) adding the surface-modified porous microsphere to a pressure vessel, adding graphene slurry, pressurizing and pressing the graphene slurry into the porous microsphere, (c) subjecting the graphene composite porous microsphere to filtration, adding silane-terminated polyurethane prepolymer and carrying out high-pressure spray polymerization, and (d) dispersing the graphene/porous microsphere composite material into a carrier resin. USE - Method is useful for the preparation of graphene masterbatch, which is useful for automobile engineering plastics. ADVANTAGE - The method enables simple and easy preparation of graphene masterbatch with high liquidity, strength and dispersion effect, and is suitable for large-scale industrial production. DETAILED DESCRIPTION - Preparation method of graphene masterbatch involves (a) uniformly mixing and oscillating porous microsphere with surfactant, carrying out surface modification and screening to obtain a surface-modified porous microsphere, (b) adding the surface-modified porous microsphere to a pressure vessel, adding graphene slurry, uniformly stirring, leaving for 10-30 minutes, gradually pressurizing the pressure vessel to control the pressurization speed to the static pressure of 6-20 MPa, pressing the graphene slurry into a pore channel of the porous microsphere and maintaining the leaving state for 2-3 hours so that the graphene is stably attached to the surface of the pore channel, (c) subjecting the graphene composite porous microsphere to filtration, adding silane-terminated polyurethane prepolymer, carrying out high-pressure spray polymerization and assembling to obtain graphene/porous microsphere composite material, and (d) dispersing the graphene/porous microsphere composite material into a carrier resin, adding a resin modifier, uniformly stirring and extrusion granulation to obtain graphene masterbatch. The graphene masterbatch comprises 50-70 pts. wt. graphene slurry, 20-30 pts. wt. carrier resin, 10-15 pts. wt. porous microsphere, 5-10 pts. wt. silane-terminated polyurethane prepolymer, 3-5 pts. wt. resin modifier and 0.3-1 pt. wt. surfactant. The concentration of the graphene slurry is 10-20 %mass. The porous microsphere is calcium carbonate porous microsphere, barium sulfate microsphere, floating bead microsphere, hydroxyapatite microsphere, aluminum oxide microsphere or silicon dioxide microsphere having a particle size of 5-12 mu m, a pore size of 100-250 nm and a sphericity of larger than 0.85. The surfactant is polyamide wax, polypropylene wax, ethylene-vinyl acetate wax, calcium stearate, magnesium stearate, ethylene-bis-stearamide, oleamide, erucamide, phthalate, citrate, sodium dodecyl sulfate or polyvinylpyrrolidone. The carrier resin is nylon material, polyurethane material, polycarbonate material and polypropylene material. The resin modifier is epoxidized soybean oil, dioctyl phthalate, dioctyl sebacate or diisobutyl phthalate.