Manufacture of water super-absorbing fiber and fiber thereby

Abstract

An ultra-hydroscopic fibre is prepared from acrylic acid, sodium acrylate, acrylamide and hydroxypropyl methacrylate through copolymerizing in aqueous solution under triggering of polymerization trigger, providing polyvinyl alcohol as skin or core, composite extruding-out by compound extrusion noozle, hot-air dry spinning, and hot cross-linking. Its davantages are high hydroscopicity, better physical and mechanical properties and low cost.

Description

technical field [0001] The invention relates to a method for manufacturing functional synthetic polymer fiber material-superabsorbent fiber and the fiber; in particular, the leather is prepared from acrylic superabsorbent copolymer and polyvinyl alcohol fiber-forming high polymer through a twin-screw extruder continuous stock solution. -Manufacturing method and fiber of superabsorbent fiber by core composite spinning process. Background technique [0002] At present, there are three main technical routes for the production of synthetic polymer superabsorbent fibers in the world: one is the technical route of using polyacrylonitrile fibers for subsequent chemical treatment; the other is isobutylene-maleic anhydride with crosslinking agent The aqueous solution of the copolymer is the spinning stock solution, which is dry-spun and thermally cross-linked. The manufacturing technology route of the joint process. [0003] Japanese Patent Laid-Open No. 497526, No. 55-132754, No. ...

AI Technical Summary

Problems solved by technology

Although the above-mentioned documents disclose the use of partially neutralized polyacrylic acid or copolymers of acrylic acid and other monomers mixed with polyvinyl alcohol to produce superabsorbent fibers, in fact, the addition of polyvinyl alcohol components will increase the spinning rate. The viscoelasticity of the dope, which affects the rheology and spinnability of the dope

In addition, during the thermal crosslinking process after fiber formation, a large number of hydroxyl groups on the macromolecular chain of polyvinyl alcohol are prone to excessive crosslinking with carboxyl groups, making it difficult to control the degree of crosslinking

[0008] EP0268498A 2 、EP0269393A 2 It is disclosed that acrylic acid, sodium acrylate, methyl acrylate, and hydroxypropyl methacrylate are copolymerized to obtain a copolymer aqueous solution, or acrylic acid, sodium acrylate, (2-ethyl) hexyl acrylate are copolymerized and epoxy polypropylene oligomerization is added. The aqueous solution of the substance is wet-spun in an acetone coagulation bath or hot-air dry-spun and thermally cross-linked to obtain a water-absorbent fiber that absorbs 200-300 g / g of pure water. The monomer mainly plays the role of improving the spinnability of the spinning dope and improving the physical and mechanical properties of the fiber, but in fact the copolymer spinning dope system is used even when the methyl acrylate content is as high as 40% (weight fraction). The breaking strength of the fiber is still low, generally only 11-1.5g / d, such fibers generally need to be processed by a special post-processing technology, which brings difficulties to the post-processing of the fiber

In addition, the raw material cost of methyl acrylate is relatively high, and it is extremely volatile and escapes during the polymerization, spinning dope preparation and spinning production process and pollutes the environment