▎ 摘　　要

NOVELTY - Preparing light-weight heat insulation wave absorbing material based on graphene involves performing pretreatment of graphene oxide and carbonylated nano-iron particles respectively, performing heat drying treatment for 1-2 hours followed by acetone, ethanol, drying after cleaning. The graphene oxide powder after pretreatment is dispersed in N-methylpyrrolidone to obtain graphene oxide solution. The graphene oxide solution is added to the N-methylpyrrolidone solution dissolving iron ferrite under continuous nitrogen atmosphere stirring at 80 degrees C. The obtained reaction mixture is transferred to hydrothermal kettle and reacted in drying oven at 80 degrees C for 16-32 hours, suction filtration of the mixed liquid, repeated washing with ethanol during suction filtration process, dried to obtain modified graphene oxide powder. USE - Method for preparing light-weight heat insulation wave absorbing material based on graphene. ADVANTAGE - The method enables to prepare light-weight heat insulation wave absorbing material based on graphene that has simple powder preparation process, low production cost and excellent electromagnetic wave absorption performance. DETAILED DESCRIPTION - Preparing light-weight heat insulation wave absorbing material based on graphene involves performing pretreatment of graphene oxide and carbonylated nano-iron particles respectively, performing heat drying treatment for 1-2 hours followed by acetone, ethanol, drying after cleaning. The graphene oxide powder after pretreatment is dispersed in N-methylpyrrolidone to obtain graphene oxide solution. The graphene oxide solution is added to the N-methylpyrrolidone solution dissolving iron ferrite under continuous nitrogen atmosphere stirring at 80 degrees C. The obtained reaction mixture is transferred to hydrothermal kettle and reacted in drying oven at 80 degrees C for 16-32 hours, suction filtration of the mixed liquid, repeated washing with ethanol during suction filtration process, dried to obtain modified graphene oxide powder. The aqueous graphene oxide solution is prepared by dispersing modified graphene oxide powder obtained with distilled water, diluted to concentration of 0.01-0.05g/mL, centrifuged to remove unstripped graphite and other impurities, and passed machine for 1-2 hours, mixed, and finally forms the required modified graphene oxide aqueous solution. The aqueous solution of the modified graphene oxide obtained is sonicated at room temperature for 24 hours to divide the pre-treated carbonylated nano-iron particles, add to the modified graphene oxide aqueous solution every two hours. The nafion is added at the last two hours to form a viscous suspension. The suspension is injected into liquid nitrogen and freezed for 15-20 minutes to finalize shape to obtain gel. The gel is placed in carbon dioxide supercritical drying kettle for drying to obtain graphene oxide/ carbonylated nano-iron composite aerogel. The temperature and vacuum degree are (-)85 degrees C and 0.06 megapascal respectively. The graphene oxide/carbonylated nano-iron composite aerogel is placed in tube furnace and heat treated at 600-700 degrees C for 2-4 hours under the protection of argon atmosphere to obtain light weight based on graphene insulation absorbing material.