▎ 摘　　要

NOVELTY - Carbon fiber surface structure defect repair includes carrying out surface oxidation treatment on a pre-oxidized and carbonized carbon fiber bundle, carrying out corona discharge under high voltage, preparing functional graphene, distilled water, and small amount of dispersing agent into uniform and stable suspension, applying positive electrostatic electricity to the graphene suspension, flattening the charged carbon fiber bundle and grounding to form a spraying fluid acceptor, and implanting graphene into the surface structure defects of the carbon fiber by electric atomization deposition. USE - Carbon fiber surface structure defect repair (claimed). ADVANTAGE - Tensile strength of the carbon fiber is increased by more than 150%. DETAILED DESCRIPTION - Carbon fiber surface structure defect repair comprises uses electric atomization deposition method for implanting graphene into the surface structure defects of carbon fiber to improve the strength of the carbon fiber. It comprises carrying out surface oxidation treatment on a pre-oxidized and carbonized carbon fiber bundle, transmitting a pre-oxidized and carbonized carbon fiber bundle into a high-voltage corona discharge area, carrying out corona discharge under high voltage of - 5 to - 30 kV and discharge distance of 1-5 cm, where conveyor belt moving speed is 5-30 m/hour, so that a certain amount of negative charge is taken along in the surface structure defects of the carbon fiber, preparing functional graphene, distilled water, and small amount of dispersing agent into uniform and stable suspension, where functional graphene is aminated graphene, sulfonated graphene, and hydroxylated graphene, dispersing agent is a mixture of 0.1-1 wt.% ionic liquid and water, ionic liquid is 1,3-dimethylimidazolium tosylate, 1-butyl-3-methylimidazolium p-toluenesulfonate, 1-octyl-3-methylimidazolium chloride, or 5-bromo-2-methyl-3-nitropyridine, the content of graphene in the suspension is 10-60 g/L, and functional group content is 0.5-4 wt.%, applying positive electrostatic electricity of 20-50 kV to the graphene suspension, flattening the charged carbon fiber bundle and grounding to form a spraying fluid acceptor, implanting graphene into the surface structure defects of the carbon fiber by electric atomization deposition at controlled carbon fiber and graphene weight ratio of 1000:0.1-4, where electrostatic deposition device comprises high voltage power supply i.e. positive electricity generator, injector needles, and grounding electrode plate, where positive electricity generator is connected with the anode through wires and injector needles, and carrying out heat treatment on the carbon fiber bundle under inert gas argon atmosphere at 300-1600 degrees C after atomization deposition is carried out.