▎ 摘　　要

NOVELTY - Polymer composite material comprises polyethylene as a matrix of the composite material, and filler of the composite material includes aluminum micron powder and graphene nanosheets. USE - Polymer composite material used for spatial neutron shielding. ADVANTAGE - The polymer composite material is installed on multiple spacecraft electric, electronic device, has high specific surface area, high conductivity, improves the conductivity of the composite material, enhances neutron scattering, increases neutron propagation path and improves neutron shielding efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a polymer composite material, which involves adding the required amount of polyethylene matrix, aluminum micron powder and graphene nanosheets, or polyethylene matrix and aluminum micron powder into the high-speed mixer, mixing at 100-1000rpm, and then adding to the screw extruder at 170-250 degrees C, melting, mixing, extruding and pelletizing to obtain product.