Ultrahigh molecular weight polyethylene fiber surface synergistic enhancement method and polyethylene fiber

By employing radio frequency plasma activation, disperse dye dyeing, and polydopamine coating construction, the problem of improving the surface properties of ultra-high molecular weight polyethylene fibers has been solved, achieving efficient and environmentally friendly surface modification suitable for roll-to-roll continuous production. This method enhances the wettability, color fastness, and abrasion resistance of the fibers while maintaining their mechanical properties.

CN121629772APending Publication Date: 2026-03-10NANTONG NTEC MONOFILAMENT TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

Existing technologies struggle to comprehensively improve the surface polarity, dyeability, coating adhesion, and abrasion resistance of ultra-high molecular weight polyethylene fibers without compromising their mechanical properties. In particular, there is a lack of environmentally friendly processes suitable for roll-to-roll continuous production.

Method used

The method employs radio frequency plasma activation, disperse dye dyeing, and polydopamine coating construction. The fiber is surface activated under a mixture of oxygen and argon gas, then the dye is fixed in a high-temperature dye bath, and dopamine is self-oxidatively polymerized in a weakly alkaline environment to form a polydopamine coating. Finally, the process is carried out in a roll-to-roll continuous manner.

Benefits of technology

It significantly improves the wettability, color fastness and abrasion resistance of fibers, while maintaining the tensile strength of fibers, achieving efficient and environmentally friendly surface modification suitable for a variety of applications.

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Abstract

The invention discloses a surface synergistic enhancement method of ultra-high molecular weight polyethylene fibers. The surface synergistic enhancement method sequentially comprises the steps of plasma surface activation, disperse dye bath dyeing and polydopamine coating construction. Firstly, radio frequency plasma of mixed gas of oxygen and argon is adopted to activate fibers, so that polar groups such as hydroxyl, carboxyl and carbonyl are introduced to the surfaces of the fibers, and the surface energy is improved. Then the activated fibers are placed in a high-temperature disperse dye bath, so that dye molecules are adsorbed and fixed to the surfaces of the fibers, and a transition interface layer with certain polarity is formed; and finally, forming a dense, uniform and firmly-attached polydopamine coating on the surface of the fiber by utilizing dopamine auto-oxidation polymerization in a weak alkaline environment, and further stabilizing the coating by heating and curing. The water contact angle of the fiber treated by the method disclosed by the invention can be reduced to be less than 30 degrees; the dry and wet rubbing color fastness can reach grade 4-5; the mass loss rate is less than or equal to 1% after 1000 times of Taber friction; the tensile strength retention rate is not less than 95%.
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