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Method of preparing high performance polyvinyl alcohel fiber

A technology of polyvinyl alcohol fiber and polyvinyl alcohol, applied in the direction of fiber chemical characteristics, melt spinning method, single-component synthetic polymer rayon, etc., can solve the problem of reducing the strength and modulus of polyvinyl alcohol and the difficulty in obtaining high-quality fibers , complex extraction of plasticizers, etc., to achieve the effects of increased boiling point, improved spinning stability, and excellent stretchability

Active Publication Date: 2007-09-26
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the copolymerization process is complicated and the cost is high; there are compatibility problems in blending, and the strength and modulus of polyvinyl alcohol are reduced; plasticized melt spinning is the most common, and most plasticizers are water, ethylene glycol, glycerol and low molecular weight Polyethylene glycol, but water is used as a plasticizer, and water is prone to bumping to generate bubbles during melt processing, which makes continuous spinning difficult, and special extrusion equipment is required; high-boiling point compounds are used as plasticizers, and the extraction of plasticizers is complicated. It is difficult to obtain high-quality fibers, and the strength of glycerol plasticized polyvinyl alcohol melt-spun fibers produced in the laboratory is ≤10cN / dtex
At present, the melt spinning of polyvinyl alcohol has not yet achieved large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: 40kg of polyvinyl alcohol with a polymerization degree of 1750±50 and an alcoholysis degree of 95mol% was added to 30.1kg of a compound modifier containing alcohol amine, and swelled in a closed container at 20°C under stirring. The modified polyvinyl alcohol was melted in a single-screw extruder with a temperature of 160°C. The melt was filtered by a metal fiber filter core and measured by a spinning pump, and then passed through a spinneret with a pore size of 0.25mm and a temperature of 120°C. After spraying, the thin melt flows through the side air blowing at a temperature of 60°C and a humidity of 70%, and then winds after cooling. The spinneret is stretched by 1.5 times. After heat-setting at 220°C for 2 minutes, high-performance polyvinyl alcohol fibers with a strength of 11cN / dtex, a single fiber fineness of 25dtex, an elongation at break of 8-10%, and a modulus of 300cN / dtex-320cN / dtex were obtained.

Embodiment 2

[0024] Example 2: 60kg of polyvinyl alcohol with a polymerization degree of 2200 and an alcoholysis degree of 99mol% was added to 42kg of an amide-containing composite modifier for swelling. The modified polyvinyl alcohol is added to a single-screw extruder-spinning machine for melting at a temperature of 145°C. After the melt is filtered and measured by a spinning pump, it is ejected from a spinneret with a temperature of 130°C and a diameter of 0.15mm. , after cooling by side air blowing at a temperature of 30°C and a humidity of 70%, it is wound. The spinneret is stretched by 2 times, and the primary fibers are stretched in three stages at 60-100°C, 130-160°C, and 180-220°C, with a total stretching ratio of 20 times, and heat-setting at 230°C for 0.5 minutes to obtain the strength. Above 15cN / dtex, the single fiber fineness is 10dtex, the elongation at break is 6-8%, and the modulus is 350cN / dtex-370cN / dtex high-performance polyvinyl alcohol fiber.

Embodiment 3

[0025] Example 3: 55 kg of polyvinyl alcohol with a degree of polymerization of 1750 and a degree of alcoholysis of 99 mol% was added to 45.3 kg of the amino acid-containing solution, and swollen in a mixer at 45°C under stirring. The modified polyvinyl alcohol was added to the extrusion-spinning machine at 165 °C for plasticization. After the melt was filtered and measured, it was sprayed from a spinneret with a temperature of 140 °C and a pore size of 0.12 mm, and the temperature was 30 °C. , The humidity is 75% of the side air blowing after cooling and winding, the spinneret stretch ratio is 2 times. The wound fiber is stretched in a water bath at 40°C, dry-heated at 80-100°C, 160-190°C, and heat-treated at 220°C for 1 minute. The total draw ratio is 15, the single fiber fineness is about 16dtex, and the strength is above 13cN / dtex. The elongation at break is 6~8%, and the modulus is 330cN / dtex~350cN / dtex polyvinyl alcohol fiber.

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Abstract

The invention relates to a method using melt spinning to manufacture high performance polyvinyl alcohol fiber. It adopts intermolecular hydrogen compound for nitrogen compound, hydrophilicity auxiliary additive, compound modifier and polyvinyl alcohol to make modified polyvinyl alcohol. The modified polyvinyl alcohol is practiced melt spinning by extruding-spinning equipment to make polyvinyl alcohol as-formed fiber. It is formed to high performance polyvinyl alcohol fiber by multi-stage stretching, drying, and hot forming. The technique is simple, economic, environmental protection, and easy to realize industrialization production.

Description

technical field [0001] The invention relates to a method for polyvinyl alcohol fibers, in particular to a method for preparing high-performance polyvinyl alcohol fibers by melt spinning. Background technique [0002] Polyvinyl alcohol is a polymer with excellent properties and wide applications. The high-performance fibers prepared from it have excellent corrosion resistance, weather resistance and good bonding properties with the substrate interface. It is the most developed synthetic fiber. The promising asbestos substitute material has a wide range of uses in the construction industry, and can also be used as tire cord, industrial fabric, high-performance rope and plastic, rubber reinforcing materials, etc., with great market potential. [0003] Polyvinyl alcohol is a crystalline polymer with a large number of hydroxyl groups in the molecule, which can form a large number of intramolecular and intermolecular hydrogen bonds, making its melting point as high as 220 ~ 240 ° ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/14D01D5/08
Inventor 王琪李莉陈宁向鹏伟刘建华华正坤
Owner SICHUAN UNIV
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