▎ 摘　　要

NOVELTY - Preparing graphene composite fiber comprises e.g. (a) mixing toluene diisocyanate, metal powder, emulsifier, and surfactant as component A according to ratio of 50-120:15-45:1-9:1-6 into a high shear emulsifier, (ii) mixing ethylenediamine aqueous solution, graphene microchip, and dispersing agent as component B, (c) extruding the polymer spinning solution from the pores of the spinneret to obtain fibers, (d) using the two different nozzles to obtain component A obtained in step (a), atomizing and spraying onto the surface of the spun fiber to obtain B component in the step (b), reacting on the surface of the polymer fiber to obtain polyurea, fixing the polyurea with the metal powder and graphene on the surface of the polymer fiber to obtain composite fiber, where the discharge rate ratio of the A and B is 1-3:1-3, and atomization spray temperature is 150-250 degrees C, and(e) collecting the composite fiber obtained in the step (d), washing and drying to obtain graphene composite fiber. USE - The fiber is useful for building reinforced concrete (claimed). ADVANTAGE - The fiber: has low preparation cost, has excellent chemical resistance, densification and mechanical properties. DETAILED DESCRIPTION - Preparing graphene composite fiber comprises (a) mixing toluene diisocyanate, metal powder, emulsifier, and surfactant as component A according to ratio of 50-120:15-45:1-9:1-6 into a high shear emulsifier, where the emulsifier is nonylphenol ethoxylate, octylphenol ethoxylate, dibutylphenol ethoxylate, alkylphenol ethoxylate, phenylethyl phenol polyoxypropylene polyoxyethylene ether, dibenzyl cumyl phenol, dibenzyl biphenol polyoxypropylene polyoxyethylene ether or phenethyl propyl propyl phenol polyoxyethylene ether, the surfactant is coco glucoside, lauryl glucoside, cetearyl glucoside, glyceryl monostearate, sucrose ester, sorbitan fatty acid, polysorbate or polyoxyethylene-polyoxypropylene copolymer, (ii) mixing ethylenediamine aqueous solution, graphene microchip, and dispersing agent as component B as according to ratio of 80-120:13-35:4-10, and where the concentration of the aqueous solution of ethylenediamine is 20-35 wt.%, (c) extruding the polymer spinning solution from the pores of the spinneret to obtain fibers, where the polymer is polypropylene, polyacrylonitrile, and aramid, (d) using the two different nozzles to obtain component A obtained in step (a), atomizing and spraying onto the surface of the spun fiber to obtain B component in the step (b), reacting on the surface of the polymer fiber to obtain polyurea, fixing the polyurea with the metal powder and graphene on the surface of the polymer fiber to obtain composite fiber, where the discharge rate ratio of the A and B is 1-3:1-3, and atomization spray temperature is 150-250 degrees C, and(e) collecting the composite fiber obtained in the step (d), washing and drying to obtain graphene composite fiber.