Composite surface modification method for ultra-high molecular weight polyethylene (UHMWPE) fibers

Abstract

The invention relates to a composite surface modification method for ultra-high molecular weight polyethylene (UHMWPE) fibers. The method comprises the steps of uniformly mixing potassium dichromate, water and concentrated sulfuric acid according to the weight ratio of (7: 10: 100) to (7: 15: 200), so as to prepare a modifying agent, submerging the UHMWPE fibers into the modifying agent, carrying out ultrasonic treatment for 3-10 minutes at the ultrasonic temperature of 35-45 DEG C, and cleaning and drying the UHMWPE fibers, wherein the ratio of the UHMWPE fibers to the modifying agent is (0.3-0.5)g: 100ml. According to the method, the UHMWPE fibers are subjected to composite surface modification by combining ultrasonic wave and chromic acid solution oxidation technologies, so that the temperature of single liquid phase oxidation treatment can be greatly lowered, and the mechanical loss of the fibers is reduced; the surface roughness of the fibers and the content of polar functional groups in the surfaces of the fibers can be effectively improved, so that the interface bond strength of a polymer-matrix composite material of the fibers is improved, and thus, the method has an important practical application value.

Description

technical field [0001] The invention relates to a method for modifying the composite surface of fibers, in particular to a method for modifying the composite surface of ultra-high molecular weight polyethylene fibers. Background technique [0002] Ultra-high molecular weight polyethylene fiber is a high-performance fiber that appeared after carbon fiber and aramid fiber. It uses ultra-high molecular weight polyethylene as raw material, through high-pressure solid-state extrusion method, plasticized melt spinning method, surface crystal growth method, super-stretching or partial super-stretching method, gel spinning-hot stretching method, etc. A high-performance fiber with high strength and high modulus prepared by the process. Ultra-high molecular weight polyethylene (UHMWPE) fiber composite materials are widely used in military, automobile manufacturing, shipbuilding, medical equipment, sports equipment and other fields due to their excellent properties such as light weigh...

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Problems solved by technology

However, there are certain defects in the above methods, such as the attenuation rate of the active groups of UHMWPE fibers after plasma treatment is relatively large, and this treatment method requires a relatively high vacuum, and the air pressure is required to be less than 40Pa, so it is difficult to achieve continuous Industrial production; the effect of corona discharge treatment of UHMWPE fibers is not very obvious, and is largely limited by the intermittent operation, so it is still very difficult to achieve industrialization and continuous production; radiation grafting treatment of UHMWPE fibers, due to fiber It needs to be irradiated for a certain period of time, so the intermittent operation limits its application to a large extent; the oxidation of UHMWPE fiber by chemical reagents is relatively mild, easy to control, and easy for continuous production, but the degree of oxidation is difficult to control, and it may be due to the degree of oxidation. Phenomenon that fiber strength decreases due to too deep