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Water soluble polyvinyl alcohol fiber and its prepn and use

A technology of polyvinyl alcohol fiber and polyvinyl alcohol, which is applied in fiber treatment, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of low strength, long dissolution time, limitation, etc., achieve excellent performance, complete dissolution, and reduce solvent cost effect

Inactive Publication Date: 2003-03-19
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All organic solvents are used, the dissolution time is long, and the low shrinkage when water-soluble is achieved by high stretch and high shrinkage. The lower the water-soluble temperature, the lower the strength, and the application is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Polyvinyl alcohol 19.6 kg with a degree of polymerization of 1750 ± 50 and a degree of alcoholysis of 97 mol% and a degree of polymerization of 1750 ± 50 and 8.4 kg of polyvinyl alcohol with a degree of alcoholysis of 92 mol% were blended and added to dimethyl sulfoxide / water=90 / 10 In a 72kg stainless steel dissolution kettle, under stirring, at a temperature of 100±3°C and a pressure of -0.05Mpa, after dissolving for 3 hours, it was pumped and filtered, degassed under normal pressure for 10 hours, and the degassing temperature was 97°C to obtain the spinning stock solution The temperature is 97°C, through a metering pump, it is sprayed out through a spinneret with a diameter of 0.15mm and 500 holes, and after passing through an air gap and a methanol coagulation bath at -8°C, the spinneret is stretched 8 times, and the spun fibers are Wet-stretched twice in a methanol bath at 25°C, then stretched and extracted the wet-stretched fiber in a methanol bath to remove dimethy...

Embodiment 2

[0037]19.5 kg of polyvinyl alcohol with a degree of polymerization of 1000 ± 50 and a degree of alcoholysis of 99 mol% and a degree of polymerization of 1750 ± 50 and 10.5 kg of polyvinyl alcohol with a degree of alcoholysis of 88 mol% were blended and added to a container containing dimethyl sulfoxide / water=90 / 10 in a 70kg stainless steel dissolution kettle, under stirring, dissolve at a temperature of 100±3°C and a pressure of -0.02MPa for 3.5 hours, filter through pump pressure, degas at normal pressure for 10 hours, and degas at a temperature of 97°C, and finally obtain colloidal particles A small amount of spinning stock solution, the temperature of the spinning stock solution is 97°C, it is sprayed out through a metering pump, a spinneret with an aperture of 0.20 mm and 500 holes, and the height of the air gap from the coagulation liquid is 25 mm, and the coagulation liquid methanol / dimethyl sulfoxide = 95 : 5, the spinneret is stretched 10 times, stretched 1.8 times in ...

Embodiment 3

[0043] 16.5 kg of polyvinyl alcohol with a degree of polymerization of 1750 ± 50 and a degree of alcoholysis of 95 mol% is blended with 14 kg of polyvinyl alcohol with a degree of polymerization of 500 ± 50 and a degree of alcoholysis of 88 mol%, and added to a container containing dimethyl sulfoxide / water = 92 / 8 In a 69.5kg stainless steel dissolution kettle, under stirring at a temperature of 97°C and a pressure of -0.01Mpa, it was dissolved for 3.5 hours, filtered by a pump, and defoamed under normal pressure for 10 hours to obtain a spinning raw material. The temperature is 97 ℃ through the metering pump, sprayed through the spinneret with a diameter of 0.2 mm and 500 holes, and spun into the methanol coagulation bath at -8 ℃, the spinneret is stretched 10 times, and stretched 2 times in the 30 ℃ methanol bath , reverse extraction in a methanol bath equipped with a hydraulic device for 3 minutes, oiling, drying, and heat stretching and setting are the same as in implementa...

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Abstract

The present invention features that PVA of polymerization degree 500-2000 and alcoholysis degree 75-99 mol% in 100 portions is mixed with solvent mixture of dimethyl sulfoxide and water in 200-400 portions, the mixture is stirred and heated to 80-120 deg.c at -0.01--0.08 MPa pressure in a stainless steel reactor for 3-4 hr to compound the spinning solution, and the spinning solution is filtered and defoamed and used in spinning to obtain water soluble PVA fiber after post-treatment. The PVA fiber has a water solving temperature of 10-90 deg.c, strength greater than 3.5 cN / dtex, monofilament length of 1.5-10 dtex, fracture elongation of 15-30%. It may be processed into top, which may further blended with wool top, cotton, top, etc. to produce fine yarn or hollow yarn, or cut into staple fiber for producing non-woven fabric, etc.

Description

1. Technical field [0001] The invention relates to a dimethyl sulfoxide / water mixed solvent which dissolves polyvinyl alcohol blends with different degrees of polymerization and different degrees of alcoholysis to form a spinning solution with relatively high viscosity, and spins through dry and wet methods. Extraction, drying, stretching and shaping to obtain water-soluble polyvinyl alcohol fibers. 2. Background technology [0002] Polyvinyl alcohol contains a large number of hydroxyl groups and has good water solubility, especially when the content of acetic acid groups is high, the macromolecular regularity is poor, the possibility of crystallization is small, and the water solubility is good. Therefore, through different polymerization degrees and alcoholysis degrees It is feasible to spin fibers with different water melting temperatures after blending polyvinyl alcohol. [0003] The methods for manufacturing polyvinyl alcohol water-soluble fibers mainly include water-b...

Claims

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Application Information

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IPC IPC(8): D01F6/14D04H1/00D06M13/00
Inventor 叶光斗郭鑫铭李守群赵厚坤何云巩清建林义滋王建刘正选童美碧彭华金晏明
Owner CHINA PETROCHEMICAL CORP
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