▎ 摘　　要

NOVELTY - Preparing high strength bio-based composite fiber, comprises (a) preparing the graphene oxide aqueous solution, adjusting pH to obtain a spinning solution, (b) adding modifier B into the graphene oxide solution, stirring, reacting to obtain a solution C containing modified graphene oxide, where the modifier B includes 3-aminopropyltriethoxysilane (KH550), 4-amino benzoic acid, isocyanate, polymethyl methacrylate and/or 2-bromine isobutyryl bromide, the adding amount of the modifier B is 1-10% of the weight of graphene oxide, (c) mixing the cellulose with modifier D1, reacting, stirring and reacting, adding modifier D2, reacting, washing and drying, dissolving in ionized water to obtain solution E containing modified fiber, (d) mixing solution C with solution E, stirring to obtain a spinning solution, (e) passing spinning solution through spinneret orifice, injecting into coagulation bath, drying to obtain graphene oxide fiber, and (f) reducing graphene oxide fiber in reducing agent F. USE - The method is useful for preparing high strength bio-based composite fiber. ADVANTAGE - The method optimizes the fiber structure, and prepares the graphene fiber with improved strength and good conductivity. DETAILED DESCRIPTION - Preparing high strength bio-based composite fiber, comprises (a) preparing the graphene oxide aqueous solution with concentration of 5-15 g/l, adjusting the pH to 5-12 to obtain a spinning solution, (b) adding modifier B into the graphene oxide solution, stirring under the condition of 20-80 degrees C, reacting for 1-24 hours to obtain a solution C containing modified graphene oxide, where the modifier B includes 3-aminopropyltriethoxysilane (KH550), 4-amino benzoic acid, isocyanate, polymethyl methacrylate and/or 2-bromine isobutyryl bromide, the adding amount of the modifier B is 1-10% of the weight of the graphene oxide, (c) mixing the cellulose with modifier D1, reacting at 20-80 degrees C for 1-24 hours, stirring and reacting, adding modifier D2, reacting at 20-80 degrees C for 1-24 hours, washing and drying the reaction product, dissolving in ionized water to obtain a solution E containing modified fiber, the concentration of modified cellulose in solution E is 5-15 g/l, where the modifier D1 includes ethanol, propanol, isopropanol, sulfuric acid, n-butyric acid, acetic acid, maleic anhydride and/or sodium hydroxide, the modifier D2 includes sodium chloroacetate, sodium hypochlorite, chloroacetic acid, 2,2,6,6-tetramethyl-piperidine oxide and/or ethylene diamine tetraacetic acid, (d) mixing the solution C with the solution E, stirring for 0.5-6 hours under the condition of 20-70 degrees C to obtain a spinning solution, where the mixing ratio of the solution C and the solution E, the modified graphene oxide, and the modified cellulose is 100:1-100:30, (e) passing the spinning solution through a spinneret orifice of 0.2-1 mm, injecting into a coagulation bath at a speed of 0.1-1 ml/minute, drying to obtain the graphene oxide fiber, and (f) reducing the graphene oxide fiber in a reducing agent F at 20-120 degrees C for 6-24 hours to obtain the graphene composite fiber.