▎ 摘　　要

NOVELTY - Method comprises adding flake graphite powder to the pre-oxidation treatment solution, adding water to the reaction system for the first time, cooling, obtaining the pre-oxidized graphite powder by suction filtration and natural air drying, adding pre-oxidized graphite powder into concentrated sulfuric acid to prepare a reaction solution, adding potassium permanganate, stirring, adding water to cool under ice-water bath, stirring, adding hydrogen peroxide, allowing to stand for overnight, pouring off the supernatant, adding dilute hydrochloric acid, stirring, mixing, allowing to stand, filtering and cleaning to obtain concentrated graphene oxide solution, centrifuging graphene oxide solution to obtain a graphene oxide liquid crystal, injecting into a coagulation bath and wet-spinning to obtain graphene oxide gel fiber aggregates, adding L-ascorbic acid and chitosan acetic acid solution, and reducing to obtain graphene hydrogel fiber, drying. USE - The aerogel fiber is useful in a graphene heat insulating material, and in household appliances. ADVANTAGE - The fiber has excellent far infrared absorption and emitting ability, and has low density, ultra-high specific surface area, high gas heat conduction inhibiting efficiency and low thermal conductivity. DETAILED DESCRIPTION - Preparing graphene aerogel fiber comprises adding flake graphite powder to the pre-oxidation treatment solution of 60-85℃ for 4-6 hours under the ice-water bath, adding water to the reaction system for the first time, cooling, allowing to stand for overnight, obtaining the pre-oxidized graphite powder by suction filtration and natural air drying, where the concentration of flake graphite powder in the pre-oxidation treatment solution is 7-17 g/ml, adding pre-oxidized graphite powder into concentrated sulfuric acid with a fraction of 96-98 wt.% under stirring to prepare a reaction solution with a concentration of 2-5 g/ml, adding potassium permanganate, controlling the temperature at 30-40°C, stirring for 1-4 hours, adding water to cool under ice-water bath, stirring for 2-5 hours, adding hydrogen peroxide until the color of the solution turns yellow, allowing to stand for overnight, pouring off the supernatant, adding dilute hydrochloric acid with a mass fraction of 3-7%, stirring, mixing, allowing to stand, filtering and cleaning to obtain concentrated graphene oxide solution, centrifuging graphene oxide solution to obtain a graphene oxide liquid crystal with a concentration of 10-20 mg/ml, injecting into a coagulation bath and wet-spinning to obtain graphene oxide gel fiber aggregates, adding L-ascorbic acid with a concentration of 5-15% and chitosan acetic acid solution of 1-5 wt.%, and reducing at 45-55°C for 8-15 hours to obtain graphene hydrogel fiber, drying with supercritical carbon dioxide to obtain graphene aerogel fiber. An INDEPENDENT CLAIM is also included for graphene aerogel fiber, prepared by above method.