▎ 摘　　要

NOVELTY - Preparation of composite material involves (1) dissolving polyvinyl alcohol particles in deionized water, reacting at 90 degrees C under water bath condition for 1-2 hours to obtain polyvinyl alcohol solution with mass concentration of 80 mg/mL, (2) dispersing graphene and carbon nanotubes in the polyvinyl alcohol solution, ultrasonically stirring to obtain graphene-carbon nanotube/polyvinyl alcohol solution, (3) reacting to obtain carbonized loofah/graphene-carbon nanotube composite material and (4) preparing carbonized loofah/graphene-carbon nanotube/cyanate ester resin composite material. USE - Preparation of composite material for aerospace and electronic packaging. ADVANTAGE - The prepared composite material has excellent electromagnetic shielding performance and mechanical property.