A kind of modified polyvinyl alcohol and spinning method thereof

Abstract

The invention discloses a novel modified polyvinyl alcohol and a spinning method thereof. The modified polyvinyl alcohol is prepared from the following raw materials: acetate or phosphate, water, a hydrophilic substance, other auxiliary agents, and polyvinyl alcohol through a fusion method; the fusion method comprises the following steps: dissolving acetate or phosphate in water, then adding the hydrophilic substance and other auxiliary agents into the water, evenly mixing, adding the mixture into polyvinyl alcohol, drying so as to obtain modified polyvinyl alcohol slices, subjecting the polyvinyl alcohol slices to a fusion spinning treatment on single-screw spinning equipment; melting, extruding, and spraying the modified polyvinyl alcohol from a spraying plate; cooling the molten fine flows by lateral winds so as to obtain polyvinyl alcohol nascent fibers; stretching the polyvinyl alcohol nascent fibers; and subjecting the stretched polyvinyl alcohol nascent fibers to a relaxation thermal setting treatment so as to obtain the high-performance polyvinyl alcohol fibers. The preparation method has the advantages of simple technology and easy realization of industrialization. The prepared fiber has a round cross section, a uniform structure, can bear large stretch force, and has a high orientation degree and good mechanical performance.

Description

technical field [0001] The invention relates to the textile field, in particular to a novel modified polyvinyl alcohol and a spinning method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a polyhydroxy polymer with excellent performance and wide application. Polyvinyl alcohol (PVA) fiber has hydrophilicity, high strength, high modulus, good wear resistance, good thermal performance, excellent corrosion resistance and weather resistance, and good interface bonding with matrix materials in composite materials, etc. Advantages, it is widely used in the national economy and high-tech fields, and has great market potential. [0003] However, the polyhydroxyl and strong hydrogen bond characteristics of PVA make its melting point (melting point 234°C; melting range 223-238°C) very close to the thermal decomposition temperature (242°C), making it difficult to perform thermoplastic processing. Traditional PVA fibers are generally processed by wet spinning. Due t...

AI Technical Summary

Problems solved by technology

However, the chemical copolymerization method generally has complicated process flow, high equipment requirements, and high modification cost; and the physical blending method, due to the coexistence of the two components, greatly affects the molecular orientation of PVA, and it is difficult to prepare high-performance PVA fibers.

Therefore, the current PVA melt spinning technology still faces great technical challenges