▎ 摘　　要

NOVELTY - Preparation of high-strength macroscopic graphene conductive fiber involves oxidizing graphite to obtain graphene oxide; dispersing graphene oxide in the water or polar organic solvent for forming 1-20 mass% of spinning dope sol which is taken into the spinning device; continuously and uniformly extruding spinning dope from spinning nozzle capillary, and adding into coagulating liquid; collecting original fiber after solidifying by roller; and performing chemical reduction of graphene oxide fiber after drying to obtain the fiber. USE - For preparation of high-strength macroscopic graphene conductive fiber (claimed) used in graphene composite material. ADVANTAGE - The method is simple spinning process having ambient operation, without strong corrosive reagent, and is green environment-friendly process, where the graphene oxide fiber has good electrical conductivity, excellent mechanical performance, good toughness, and can be weaved into pure graphene fiber cloth, and mixed into all kinds of fibers with other fabrics, further added to the polymer to be the reinforced conductive agent, which can be applied in domains for replacing the carbon fiber. The fiber exhibits highest strength, excellent conductivity and thermal conductivity. The method efficiently uses graphite to graphene textile fiber as raw material. The method provides fiber having high strength, good toughness and conductive performance. The method is low-cost; has simple operation; and is green and environment-friendly. The method uses graphene fiber as wide source of raw material. The method allows simple preparation of the graphene oxide precursor and stable graphene oxide sol-gel high solubility. The method uses solution spinning method to prepare the graphene oxide. The prepared graphene oxide fiber has good strength and toughness; and at the same time it has excellent conductivity. DETAILED DESCRIPTION - Preparation of high-strength macroscopic graphene conductive fiber involves mixing 1 part of graphite raw material, 1 to 100 parts of sulfuric acid, 0.5 to 5 parts of potassium persulfate and 0.5 to 5 parts of phosphorus pentoxide, stirring and reacting for 1 to 10 hours at 25 to 100 degrees C, diluting with the deionized water after cooling to the room temperature, filtering with the filter film, washing with deionized water to the neutral, natural drying for 10 to 50 hours to obtain the embedded layer graphite; mixing 1 part of embedded layer graphite obtained by first step, 1 to 100 parts of sulfuric acid, and 0.5 to 10 parts of potassium permanganate, stirring and reacting for 0.1 to 10 hours at -10 to 50 degrees C, adding 10 to 2000 parts of deionized water and 0.1 to 10 parts of hydrogen peroxide and stirring for 0.1 to 10 hours, filtering with the filter film, washing to the neutral with the deionized water, natural drying to obtain the preliminary graphite oxide; mixing 1 part of preliminary graphite oxide product obtained by second step, 1 to 100 parts of sulfuric acid, and 0.5 to 10 parts of potassium permanganate, stirring and reacting for 0.1 to 10 hours at -10 to 50 degrees C, adding 10 to 2000 parts of deionized water and 0.1 to 10 parts of hydrogen peroxide and stirring for 0.1 to 10 hours, filtering with the filter film, washing to the neutral with the deionized water, natural drying to obtain the grapheme oxide; dissolving 1 part of the graphene oxide product obtained by above step in 5 to 100 parts of solvent, obtaining the graphene oxide spinning dope sol after the 0 to 50 KHz ultrasonic processing for 0.1 to 10 hours; taking the graphene oxide spinning dope sol obtained by fourth step, passing through the 5 to 500 micron of diameter of the spinning capillary with the 1 to 100 ml/hour of extruded velocity, pausing 1 to 100 second to coagulate the silk in the 50 to 80 degrees C of coagulating liquid, washing and drying to obtain the graphene fiber; and putting the graphene fiber obtained in fifth step into the reducing agent for 1 to 100 hours of reduction, washing and drying to obtain the high-strength macroscopic graphene conductive fiber.