Surface treatment method of middle-high-strength carbon fibers

Abstract

The invention provides a surface treatment method of middle-high-strength carbon fibers. The surface treatment method of the middle-high-strength carbon fibers comprises the following steps: (1) soaking the middle-high-strength carbon fibers of which carbonic mass ratio is higher than 90% with acrylic acid, and then washing cleanly with deionized water; (2) introducing the cleanly washed middle-high-strength carbon fibers in the step (1) into continuous electrochemical treatment equipment, taking a graphite plate, a stainless steel plate, a copper plate or a nickel plate as a cathode, carrying out electrochemical oxidation treatment with alkalescent electrolyte at the temperature of 20-60 DEG C, controlling applied current density to be 0.1-10 mA / cm(2), treating for 20-240 s, then washing, drying, sizing and rolling to obtain the middle-high-strength carbon fibers. By the treatment method, drawing strength and shear strength of the carbon fibers can be improved, and further, the tensile strength of carbon fiber bodies cannot be damaged.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber treatment, and in particular relates to a surface treatment method for medium and high-strength carbon fibers. Background technique [0002] Carbon fiber is a fibrous carbon material with a carbon content greater than 90%. It has excellent properties such as high tensile strength, high tensile modulus, low density, high temperature resistance, ablation resistance, corrosion resistance, high electrical and thermal conductivity, low thermal expansion, self-lubrication and good biocompatibility. Ablation, structural and functional composite components. At present, carbon fiber and its composite materials are mainly used in cutting-edge technology industries such as aerospace, aviation, and atomic energy, as well as in the manufacture of sports equipment. As a reinforcement of composite materials, the strength of the carbon fiber body and the interface between it and the matrix material are the...

AI Technical Summary

Problems solved by technology

[0004] At present, there are very few studies aimed at improving the surface structure of carbon fibers and increasing the tensile strength, and there are few reports on the simultaneous improvement of the intrinsic tensile strength of carbon fibers and the interlaminar shear strength of composite materials by electrochemical oxidation.