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

A technology of polyvinyl alcohol and short fibers, which is applied in the direction of spinning solution preparation, fiber treatment, fiber chemical characteristics, etc., can solve the problems of unsatisfactory application effect, high water melting temperature, and long process flow, so as to save manpower and material resources, The effect of low water dissolution temperature and short process flow

Active Publication Date: 2015-03-11
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

90°C polyvinyl alcohol staple fiber obtained by the above-mentioned production processes such as stock solution preparation, spinning, heat treatment, winding and cutting, and finishing (including hot water crimping, pre-washing, oiling, post-washing, drying, and packaging) , its water-soluble temperature is high, the process is long, and the application effect in the fields of textile and non-woven soluble embroidery base cloth, water-soluble paper, etc. has not been ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Put 1125kg of polyvinyl alcohol with a degree of polymerization of 1250±50 and a degree of alcoholysis of 98.9mol%, and 3875kg of water into a stainless steel dissolution kettle, add 1.0kg of VL-22 surfactant (or OP-10 surfactant), and stir Dissolved at a temperature of 98-100°C and a pressure of 0.1Mpa for 4 hours, filtered by pump pressure, degassed at normal pressure for 480 minutes, and degassed at a temperature of 97°C to obtain a spinning stock solution with a temperature of 97°C; 0.08mm, 16000-hole spinneret sprays out, directly enters the coagulation bath of saturated sodium sulfate aqueous solution at 44±2°C, the spinneret is stretched 0 times, and the spun fibers are stretched 1.7 times in the hot and humid bath; The tow is then washed and oiled to remove the Glauber's salt entrained in the fiber, so that the fiber has a 0.25% oil adhesion rate, and eliminates the static electricity generated by the fiber during use; the surface temperature of the tow is dried ...

Embodiment 2

[0072] Put 880kg of polyvinyl alcohol with a degree of polymerization of 1580±20 and a degree of alcoholysis of 98.8mol%, and 3030kg of water into a stainless steel dissolution kettle, add 0.4kg of VL-22 surfactant, and stir at a temperature of 98-100°C and a pressure of 0.1 Mpa, filtered by pump pressure after dissolving, degassing at normal pressure for 480 minutes; through a metering pump, sprayed through a spinneret with an aperture of 0.06mm and 18,000 holes, and directly enters a coagulation bath of saturated sodium sulfate aqueous solution at 44±2°C , the wet heat stretching ratio is 1.9 times, the tow is then washed and oiled, the washing temperature is 34±2°C, the oil bath temperature is 38±2°C, the oil bath concentration is 25g / l, and the entrained fibers in the fiber are washed away. Glauber's salt, to eliminate static electricity generated by the fiber during use; after the tow is dried, it is stretched by dry heat. 6-7 crimps per 25mm, enhance the cohesion of the ...

Embodiment 3～8

[0073] Embodiment 3~8: carry out according to following process parameter, other are all identical with embodiment 2. The obtained water-soluble polyvinyl alcohol staple fiber has a water-soluble temperature of 65-75°C, a breaking strength of ≥3.2cN / dtex, a linear density of 1.11-1.67dtex, and a crimp of ≥4 pieces / 25mm with a smooth fiber surface, which is especially suitable for textile, Soluble embroidery base fabric, water-soluble paper and other fields in the non-woven fabric industry.

[0074] Example Polyvinyl alcohol alcoholysis degree, polymerization degree Stock solution preparation raw materials and their dosage Degassing time for stock solution preparation (unit: minute) Spinning washing, oil bath temperature (°C), oil bath concentration (g / l) Moist heat stretching ratio Spinneret hole number, spinneret hole diameter (mm) dry heat stretching Heat setting temperature (°C) and time (minutes) 3 99.0mol%, 1350±50 Polyvinyl alcohol 100kg, ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/14D01F6/50D01F1/10D01D5/06D01D5/12D01D10/02D01D1/02D01D1/10D01D4/02
Inventor 康正周赵彬唐庆邢海林贵华李岩何云刘进宏刘世清李卓洪
Owner CHINA PETROCHEMICAL CORP
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