Water-soluble polyvinyl alcohol chopped fiber as well as preparation method and application thereof

Abstract

The invention discloses a water-soluble polyvinyl alcohol chopped fiber of which the water dissolving temperature is 65-75 DEG C. The water-soluble polyvinyl alcohol chopped fiber is prepared by performing spinning and spinning after-treatment on polyvinyl alcohol and water serving as raw materials, wherein the polymerization degree of the polyvinyl alcohol is 1,400+ / -200, the alcoholysis degree is 98.3-99.9 percent, and the mass percentage concentration is 21.0-23.0 percent. The water-soluble polyvinyl alcohol chopped fiber has low water dissolving temperature, and has particularly prominent application effects in the fields of soluble embroidery base cloth, water-soluble paper and the like in the industries of spinning and non-woven fabrics; the water-soluble polyvinyl alcohol chopped fiber is free from salt, so that fiber adhesion is prevented during drying after desalination in the production process; and meanwhile, the strength of the water-soluble polyvinyl alcohol chopped fiber is more than or equal to 3.2 cN / dtex, and the crispation number is more than or equal to 4 / 25 millimeters. The preparation method contributes to industrial mass production, the dissolving temperature of the prepared water-soluble polyvinyl alcohol chopped fiber is 65-75 DEG C, and grading, packaging and transportation are easy.

Description

technical field

[0001] The invention relates to a low-temperature water-soluble polyvinyl alcohol short fiber and its preparation method and application, in particular to a 70°C water-soluble polyvinyl alcohol short fiber and its preparation method and application. Background technique

[0002] Polyvinyl alcohol contains a large number of hydroxyl groups and has good water solubility. Therefore, it is feasible to produce fibers with different water-soluble temperatures through polyvinyl alcohol with different degrees of polymerization and alcoholysis. The methods for producing polyvinyl alcohol water-soluble fibers mainly include water-based wet spinning, dry spinning, wet gel spinning and dry-wet gel spinning. Among them, the water-based wet spinning process is simple and low in cost.

[0003] At present, the water-based wet spinning process is used to produce water-soluble polyvinyl alcohol staple fibers with a water-soluble temperature of 85-95 °C, a dry breaking strength...