Method for preparing high-strength high-modulus polyvinyl alcohol fibers

• Main Authors: XU DEGEN, YANG ZHIQIAN, LV JIN, LI CHANGFENG, LIU JIAPING, LIU JIANZHONG, ZHOU HUAXIN, CUI GONG
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2013
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS; NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING; TEXTILES

The invention relates to a method for preparing high-strength high-modulus polyvinyl alcohol fibers. The method comprises the following steps of: mixing 10-40 parts by weight of poly-hydroxymethyl compounds with 30-70 parts by weight of water to obtain a mixture serving as a composite modifier; then evenly mixing the composite modifier with 0.01-5 parts by weight of inorganic alkali compounds and 100 parts by weight of polyvinyl alcohol with polymerization degree of 1700-2600 and alcoholysis degree of 88-99% in a high-speed mixer to obtain modified polyvinyl alcohol; then spinning on a melt spinning machine to prepare nascent polyvinyl alcohol fibers; finally implementing cold drawing, drying, multi-stage hot drawing and hot shaping. The method needs neither solvents nor coagulators for wet spinning, thereby being simple in technology and free from pollution; a screw rod with a unique structure is not required; industrial production is easy to realize. The prepared fibers are high in fiber strength and high i