▎ 摘　　要

NOVELTY - A graphene/PMMA composite comprises 0-2 parts mass graphene, 100 parts mass PMMA, 0-0.2 part mass surfactant and 500-1000 parts mass solvent. The surfactant is OP-10 (alkylphenol polyoxyethylene ether (10)), Tween-80 (RTM: polyoxyethylene (20) sorbitan monooleate), Tween-20 (RTM: Polyoxyethylene (20) sorbitan monolaurate) or Span-60 (RTM: Sorbitan monostearate). The solvent is acetone, butanone, dimethylformamide, tetrahydrofuran and/or trichloromethane. USE - Graphene/poly(methyl methacrylate) (PMMA) composite material for use in LED lens material lighting applications (claimed). ADVANTAGE - The graphene/PMMA composite material has high dispersion, improved thermal conductivity, high hardness and excellent wear-resistant. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing graphene/PMMA composite material, which involves (i) magnetically stirring 3-12 wt.% optical grade PMMA and solvent in a mass ratio of 1:5-20 for 2-8 hours under magnetic stirring to obtain PMMA polymer solution, (ii) adding surfactant to PMMA polymer solution, weighing graphene in an amount of 0-2% of PMMA, adding and magnetically stirring for 15-30 minutes, ultrasonically dispersing for 0.5-1 hours, and dispersing in high-speed homogenizer for 5-20 minutes, (iii) heating the mixed solution obtained in step (ii) at 50-100 degrees C, removing solvent, drying and crushing to obtain graphene/PMMA masterbatch, (iv) mixing graphene/PMMA masterbatch with different proportions of optical grade PMMA by high speed mixer for 5-10 minutes according to a graphene/PMMA masterbatch and PMMA mass ratio of 1:1-100 to obtain mixture, (v) extruding the mixture and pelletizing on a twin-screw extruder at a temperature of 150-230 degrees C at a screw speed of 20-30 rpm, (vi) injection molding pellets using a precision injection molding machine at 180-240 degrees C under the pressure of 80-130 MPa at 40-80 degrees C to obtain graphene/PMMA composite material.