Water-soluble polyvinyl alcohol fibre and preparation technique thereof

A polyvinyl alcohol fiber, water-soluble technology, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, rayon heat treatment, etc., can solve problems such as poor uniformity, and achieve good spinnability. , The adhesion rate is flexibly adjusted, and the quality is good.

Inactive Publication Date: 2008-05-14
HUNAN XIANGWEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported in the literature that both the dry method and the dry-wet spinning method of water-soluble polyvinyl alcohol adopt the hot air crimping process, which uses the internal strain of the fiber to crimp. not too good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Wash 32kg of polyvinyl alcohol with a degree of polymerization of 1750±80 and a degree of alcoholysis of 99mol% with water, and add 168kg of purified water into the dissolution tank, and dissolve it for 3.5 hours at a temperature of 98±2°C and a pressure of -0.015Mpa under stirring. , after filtration, static degassing under normal pressure for 6-8 hours, the obtained spinning stock solution is at a temperature of 98±0.5°C, and after being metered by a metering pump, it is sprayed out through a spinneret with an aperture of 0.07mm and 30,000 holes, and at a temperature of 44±1 It is solidified into primary fibers in a Glauber’s salt bath at ℃, stretched by guide rollers 2.5 times, and stretched by wet heat 1.6 times. Heat, 220~280℃ dry heat stretching and heat setting, the dry stretching ratio is 1.3 times, and then mechanical oiling and mechanical crimping, the dry breaking strength of the water-soluble fiber is 7.5cN / dtex, and the linear density of the single fiber is ...

Embodiment 2

[0037] Wash 40kg of polyvinyl alcohol with a degree of polymerization of 1200±50 and a degree of alcoholysis of 97mol% with water, and add 160kg of purified water into the dissolution kettle, and dissolve it at a temperature of 98±2°C and a pressure of -0.012Mpa under stirring for 3 hours. , after filtration, degassing under normal pressure for 6-8 hours, the spinning stock solution is prepared at a temperature of 98±0.5°C, measured by a metering pump, sprayed out through a spinneret with an aperture of 0.08mm and 24,000 holes, and passed through a 44±1 The nascent fibers are solidified in a Glauber’s salt bath at ℃, stretched 2.4 times by guide rollers, and 1.5 times in wet heat. Heat, 220~280℃ dry heat stretching and heat setting, the dry stretching ratio is 1.25 times, and then through mechanical oiling and mechanical crimping, the fiber dry breaking strength is 6.3cN / dtex, the single fiber linear density is 1.5dtex, and the dry breaking elongation is obtained The rate is 1...

Embodiment 3

[0040] Wash 35kg of polyvinyl alcohol with a degree of polymerization of 800±50 and a degree of alcoholysis of 88mol% with water, and add 165kg of purified water into the dissolution tank, and dissolve it at a temperature of 98±2°C and a pressure of -0.014Mpa under stirring for 3 hours. , after filtration, degassing under normal pressure for 6-8 hours, the spinning stock solution was prepared at a temperature of 98±0.5°C, measured by a metering pump, sprayed out through a spinneret with an aperture of 0.08mm and 30,000 holes, and passed through a 44±1 The nascent fibers are solidified in a Glauber’s salt bath at ℃, stretched 2.4 times by guide rollers, and 1.5 times in wet heat. Heat, 220~280℃ dry heat stretching and heat setting, the dry stretching ratio is 1.2 times, and then through mechanical oiling and mechanical crimping, the fiber dry breaking strength is 5.8cN / dtex, the linear density is 1.6dtex, and the dry breaking elongation is 13 ~20%, water melting temperature 70~...

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Abstract

The invention relates to a water-soluble polyvinyl alcohol fiber and a preparation method thereof. The water-soluble polyvinyl alcohol fiber provided by the present invention has the following characteristic parameters: fiber dry breaking strength ≥ 5cN / dtex, dry breaking elongation 10-20%, water solubility temperature 60-90 DEG C, single fiber fineness 1.0-8dtex, number of crimps 8 to 12 pieces / 25mm. The invention overcomes the shortcomings of the existing method that the technical process is long, the fibers are subjected to secondary drying, and the production energy consumption is high, and the performance of the prepared water-soluble polyvinyl alcohol fibers is improved to some extent.

Description

technical field [0001] The invention relates to a water-soluble polyvinyl alcohol fiber. The invention also relates to the preparation process of the water-soluble polyvinyl alcohol fiber, especially the water-based wet spinning process. Background technique [0002] The average molecular weight of polyvinyl alcohol used in polyvinyl alcohol fibers is 60,000-150,000, the thermal decomposition temperature is 200-220°C, and the melting point is 225-230°C. Polyvinyl alcohol fibers can be produced by wet spinning and dry spinning. [0003] Water-soluble polyvinyl alcohol fiber is a kind of vinylon differentiated fiber. Japan is the first country to develop water-soluble fiber. Water-soluble polyvinyl alcohol fibers can be produced by processes such as conventional wet spinning, organic solvent wet spinning, dry-wet spinning, dry spinning, and semi-melt spinning (Li Shenglin, Qin Feng, Water-soluble polyvinyl alcohol fiber Dry spinning of vinyl alcohol fibers and polyvinyl al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/14D01D5/06D01D5/12D01D10/02
Inventor 贺正龙刘永杰周金华尹飞奇龙子武伍龙飞贺前荣周浩然田仁主张宏吴辉
Owner HUNAN XIANGWEI
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