Surface modification method for M40J graphite fibers

Abstract

The invention provides a surface modification method for M40J graphite fibers, relates to a surface modification method for fibers, and aims at solving the problem that the surface modification treatment of the M40J fibers is difficult to carry out because the existing M40J fibers are high in graphitization degree, perfect in crystalline region development, low in heteroatom content, low in fiber surface energy and less in relative active spot. The surface modification method comprises the following steps of: 1, dispersing graphene oxide in an E-51 epoxy resin-acetone solution to prepare a slurry; 2, putting the M40J fibers into the slurry obtained in the step 1 for dip coating; and 3, irradiating the M40J fibers, which are subjected to dip coating in the step 2, by using gamma rays under an inert gas or vacuum condition to realize a grafting reaction between graphene oxide and the surfaces of the M40J fibers, and introducing active groups on a lamella of graphene oxide into the surfaces of the fibers to finish the modification process. The surface modification method is simple in operation, stable in process, reliable in quality and suitable for industrial production, and is applied to the field of composite materials.

Description

technical field [0001] The invention relates to a fiber surface modification method. Background technique [0002] High modulus carbon fiber and its composite materials are one of the important materials used in high-tech fields such as aerospace, new energy, transportation, oil and gas development, storage and transportation. M40J graphite fiber has the advantages of excellent mechanical properties, high temperature resistance, good dimensional stability, good chemical stability, and low thermal expansion coefficient, so it is considered to be an ideal reinforcement material for advanced composite materials, and is favored by the majority of composite material science and technology workers. However, the unique graphite inert structure and smooth surface of M40J graphite fiber lead to poor interfacial bonding performance of the composite material, which greatly affects the strength of the fiber in the composite material. Weak interfacial bonding restricts the application o...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the surface of the existing M40J graphite fiber is difficult to modify the surface of the M40J graphite fiber because of the high degree of graphitization and the well-developed crystal region, which has less heteroatom content and relatively less active points. , and provide a M40J graphite fiber surface modification method

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