Aramid fiber surface grafting modification method

Abstract

The invention relates to an aramid fiber surface grafting modification method, belonging to the field of aramid fiber modification field and aiming at solving the problems of low aramid fiber surface activity and poor bonding property with a resin matrix. The aramid fiber surface grafting modification method comprises the steps of carrying out fiber surface cleaning and drying, fiber surface chlorination and fiber surface ammonolysis reaction. High-energy gamma rays with strong penetrability are utilized to excite the activities of fiber surface functional groups and a grafting agent, namely 1,4-dichlorobutane, the grafting reaction is initiated on the fiber surface, and the damage to the fiber surface structure, caused by the other surface treatment methods, can be alleviated; and meanwhile, a sheath core structure of the aramid fiber can be improved by irradiation of the gamma rays, and the phenomenon of reduction of the strength of the aramid fiber after modification treatment is effectively avoided; the process is simple, the efficiency is high, the fiber handling capacity is controllable, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of aramid fiber modification and relates to a chemical grafting method on the surface of aramid fiber. Background technique [0002] Aramid fiber is a synthetic linear polymer composed of aromatics connected by amide bonds. More than 85% of its amide bonds are directly combined with two aromatic grades, and less than 50% of the amide bonds are replaced by imide bonds. By". The full name is aromatic polyamide fiber, referred to as aramid fiber, and it is named aramid fiber in my country. Because aramid molecular chains contain a large number of benzene rings and amide bonds, the molecular chains are flat, rigid and straight, and there is no amorphous region in the molecule, which makes the fibers have high orientation and high crystallinity, so aramid fibers have Low density, high strength, high modulus, high specific hardness, corrosion resistance, wear resistance, good thermal stability, low electrical conductivity...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of low surface activity of aramid fibers and poor adhesion with resin matrix, the invention provides a treatment method for surface modification of aramid fibers

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