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 s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] Blend 19.6kg of polyvinyl alcohol with a degree of polymerization of 1750±50 and a degree of alcoholysis of 97 mol% and 8.4 kg of polyvinyl alcohol with a degree of polymerization of 1750±50 and a degree of alcoholysis of 92 mol% into dimethyl sulfoxide / water = 90 / 10 In a 72kg stainless steel dissolving kettle, under stirring at a temperature of 100±3℃, pressure -0.05Mpa, after dissolving for 3 hours, filter by pump pressure, defoaming under normal pressure for 10 hours, defoaming temperature 97℃, to prepare spinning dope The temperature is 97°C, the metering pump is sprayed through a 500-hole spinneret with a hole diameter of 0.15mm, and the spinneret is stretched 8 times after passing through an air gap and a methanol coagulation bath at -8°C. Wet stretch twice in a methanol bath at 25°C, and then draw the wet stretched fiber in a methanol bath to remove dimethyl sulfoxide. The extraction time is 5 minutes. 2 Dry in an air box, and then heat-stretch and...

Example Embodiment

[0036] Example 2

[0037]Blend 19.5 kg of polyvinyl alcohol with a degree of polymerization of 1000 ± 50 and a degree of alcoholysis of 99 mol% and 10.5 kg of polyvinyl alcohol with a degree of polymerization of 1750 ± 50 and a degree of alcoholysis of 88 mol% into the mixture containing dimethyl sulfoxide / water = 90 / 10 70kg stainless steel dissolving kettle, dissolve for 3.5 hours under stirring at 100±3℃, pressure -0.02MPa, filter by pump pressure, degas at normal pressure for 10 hours, degas at 97℃, and finally get colloidal particles. Less spinning dope, the temperature of the spinning dope is 97℃, and it is ejected through a metering pump, a diameter of 0.20mm, 500-hole spinneret, the height of the air gap from the coagulation liquid is 25mm, and the coagulation liquid methanol / dimethyl sulfoxide=95 :5, the spinneret stretches 10 times, stretches 1.8 times in a methanol bath at 20°C, reversely extracts for 5 minutes in a methanol bath equipped with an extraction exchange dev...

Example Embodiment

[0042] Example 3

[0043] Blend 16.5 kg of polyvinyl alcohol with a degree of polymerization of 1750±50 and a degree of alcoholysis of 95 mol% with 14 kg of polyvinyl alcohol with a degree of polymerization of 500±50 and a degree of alcoholysis of 88 mol%, and add dimethyl sulfoxide / water = 92 / 8 69.5kg stainless steel dissolving kettle, dissolve it under stirring at 97℃, pressure -0.01Mpa for 3.5 hours, filter by pump pressure, and defoam at normal pressure for 10 hours to obtain the spinning source. The temperature is 97℃, through a metering pump, sprayed through a spinneret with a diameter of 0.2mm and 500 holes, and then spun into a methanol coagulation bath at -8℃. The spinneret stretches 10 times and stretches 2 times in a methanol bath at 30℃. , Reverse extraction in a methanol bath equipped with a liquid pressure device for 3 minutes, oiling, drying, and thermal drawing and setting are the same as in implementation 1. A polyvinyl alcohol fiber with a water-soluble temperat...

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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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