Due to the inertness of the surface of the carbon fiber, the stress load between the carbon fiber and the matrix material in the composite material cannot be effectively transmitted, which directly affects its performance and limits its large-scale application. The industry mainly uses anodization to solve this problem. High modulus carbon fiber has the characteristics of larger surface crystal plane size, better rigidity, less bending resistance, and more prominent inertness. The surface is treated by traditional anodizing method. The treatment effect is not uniform, which reflects that the interface bonding performance in composite materials is obviously weak.
Recently, the Carbon Fiber Surface Engineering Research Group of the Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences has made new progress in surface modification. The research group used a new non-contact electrochemical treatment method to treat high-modulus carbon fibers. Through process design and process conditions optimization, it can achieve a good treatment effect and effectively reduce the abrasion of the fiber roller by the godet roller. Surface treatment test line. According to the statistics of continuous test lines: (1) this process has no obvious damage to high modulus carbon fibers, which can greatly reduce the amount of hairs and broken filaments in the surface treatment of high modulus carbon fibers; (2) carbon fibers after surface treatment The surface element content is uniform (Figure 2) and can be adjusted; (3) The shear strength value at the interface between the epoxy resin and the epoxy resin is increased by 55.2%; (4) The third-party unit ’s shear strength can be improved It can reach 80MPa and the bending strength can reach 340MPa, which are obviously higher than the reported values at home and abroad. This method overcomes the inherent shortcomings of traditional anodizing methods and has a friendly process environment. It provides a new idea and technology for the continuous preparation and application of high-performance carbon fibers, especially high-modulus carbon fibers.