A kind of ultra-high molecular weight polyethylene fiber surface functionalization treatment method

Abstract

The invention discloses a method for surface functionalization treatment of UHMWPEF (Ultra High Molecular Weight Polyethylene Fiber), which is capable of realizing good binding of fiber surface and matrix resin, so as to increase the mechanical property of a fiber-reinforced composite material. The method comprises the following steps: (1) drawing the UHMWPEF into a closed water tank containing a chlorine water phase system, and carrying out a surface chlorination reaction, thus obtaining chlorinated fiber of which the surface chlorination degree is 20 to 50 percent; (2) washing the chlorinated fiber through a circulating clear water tank; (3) drawing the washed chlorinated fiber into a grafting reaction water tank, and dipping, thus obtaining surface-hydroxylated fiber; (4) washing the surface-hydroxylated fiber through the circulating clear water tank and blow-drying; (5) putting the surface-hydroxylated fiber into a functionalization monomer solution, and controlling the system temperature or adding a reaction catalyst according to different functionalization monomer reaction requirements, thus obtaining the surface-functionalized UHMWPEF.

Description

technical field [0001] The invention relates to a fiber surface functionalization treatment method, in particular to a super high molecular weight polyethylene fiber surface functionalization treatment method. Background technique [0002] Fiber-reinforced composites have a huge market demand. So far, the fibers that have been used in high-performance resin-based composites in China mainly include: carbon fibers, aramid fibers and high-strength glass fibers, and the surfaces of these fibers contain abundant polar groups (such as: carbonyl, carboxyl, amino and hydroxyl groups). Such groups) can play a good connection with the resin, but the price is relatively high, which limits its large-scale use. Ultra High Molecular Weight Polyethylene Fiber (full name in English: Ultra High MolecularWeight Polyethylene Fiber, referred to as UHMWPE) energy absorption performance and wear resistance are better than aramid fiber, elongation at break is significantly higher than carbon fibe...

AI Technical Summary

Problems solved by technology

Compared with carbon fiber and aramid fiber, domestic UHMWPE fiber technology is more mature. However, the surface of oriented UHMWPE fiber has no reactive sites and cannot form chemical bonds with resin. The surface energy is low and is not easily wetted by resin. The rough surface is used to form mechanical engagement points, which limits its application in structural materials, so the modification of the fiber surface has great significance and broad application prospects for the application of ultra-high polyethylene fibers in composite materials

[0003] At present, the methods for polarizing the surface of polyolefin mainly include chemical oxidation treatment, corona treatment, plasma treatment and other surface modifications. Among them, chemical oxidation treatment uses strong oxidants, pollutes the environment, and easily causes the degree of oxidation to be too deep to reduce the fiber strength. decline; plasma has high requirements on equipment, and the surface polarization of corona treated fibers is not uniform. These methods are difficult to realize industrialization

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