▎ 摘　　要

NOVELTY - Preparing high-performance graphene-polyvinyl alcohol composite fiber comprises e.g. (i) functionalizing the closed isocyanate groups of graphene quantum dots (ia) mixing graphene oxide quantum dot, di-isocyanate and N, N-dimethylformamide (DMF) to obtain mixed solution A, (ib) then subjecting the solution for ultrasonic treatment to obtain product A, centrifuging the resulting product to obtain product B, and drying to obtain the product C, (ic) mixing the product C and N,N-dimethylformamide, subjecting to ultrasonicatiom to obtain mixed solution B, and adding sealing agent to obtain the mixed solution B and (id) washing the resulting mixed liquid C to obtain product D and drying to obtain blocked isocynate functionalized graphene quantum dots (GQD), (ii) preparing polyvinyl alcohol-graphene quantum dots (PVAGQD) spinning solution (iia) dissolving blocked isocyanate functionalized graphene quantum dots, dispersant and polyvinyl alcohol in and water to prepare PVA1788-GQD solution. USE - The method is useful for preparing high-performance graphene-polyvinyl alcohol composite fiber. ADVANTAGE - The method: is simple, and short; low cost; and is suitable for large-scale production, and ideal for concrete reinforcements, packaging materials and fabrics; and produces the product has excellent mechanical properties, easy dispersion characteristics and metallic luster. DETAILED DESCRIPTION - Preparing high-performance graphene-polyvinyl alcohol composite fiber comprises (i) functionalizing the closed isocyanate groups of graphene quantum dots (ia) mixing 100-1000 pts. wt. graphene oxide quantum dot, 1,000-10,000 pts. wt. diisocyanate and 1,000-10,000 pts. wt. N, N-dimethylformamide (DMF) to obtain mixed solution A, (ib) then subjecting the resulting solution for ultrasonic treatment at 80-90 degrees C for 30-60 minutes to react for 24-48 hours, then cooling to room temperature to obtain product A, centrifuging the resulting product, washing with ether to obtain product B, and drying at 60 degrees C for 12-48 hours to obtain the product C, (ic) mixing the 100-1000 pts. wt. product C and 1000-10000 pts. wt. N,N-dimethylformamide, subjecting to ultrasonicatiom for 20 minutes to obtain mixed solution B, then placing the mixed liquid B at 80-100 degrees c, adding a 100-1000 pts. wt. sealing agent, and reacting for 3-6 hours to obtain the mixed solution B, and (id) washing the resulting mixed liquid C to obtain product D, placing the product D at 80 degrees C, and drying in vacuum for 12-48h to obtain a blocked isocynate functionalized graphene quantum dots (GQD), (ii) preparing polyvinyl alcohol-graphene quantum dots (PVAGQD) spinning solution (iia) dissolving 0.005-0.02 pts. wt. blocked isocyanate functionalized graphene quantum dots, 0.005-0.02 pts. wt. dispersant and 0.02 pts. wt. polyvinyl alcohol in and 84.94-89.97 pts. wt. water, stirring, and dispersing to prepare PVA1788-GQD solution, where polyvinyl alcohol has a degree of polymerization of 1700, and degree of alcoholysis is 88%, (iib) placing the resulting PVA1788-GQD solution at 95-100 degrees C, adding 10-15 pts. wt. polyvinyl alcohol, and stirring at 50-200 rotations/minute for 5-8 hours to obtain polyvinyl alcohol-graphene quantum dot spinning solution, where the degree of polymerization of the polyvinyl alcohol is 1700-2800, molecular weight distribution is 1.5-2.0, and degree of alcoholysis is 99%, (iii) subjecting the polyvinyl alcohol-graphene quantum dot spinning solution to the wet spinning using wet spinning machine to obtain primary fiber PVA-GQD, and (iv) subjecting the primary fiber PVA-GQD to post treatment for performing multistage hot stretching, and heat setting to obtain high-performance graphene-polyvinyl alcohol composite fiber.