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Method of preparing high performance polyvinyl alcohel fiber

A polyvinyl alcohol fiber, polyvinyl alcohol technology, applied in the direction of fiber chemical characteristics, melt spinning, single-component synthetic polymer rayon, etc., can solve the problem of reducing the strength and modulus of polyvinyl alcohol, and it is difficult to obtain high-quality fibers , complex extraction of plasticizers, etc., to achieve the effects of industrialized production, easy industrialized production, and improved spinning stability

Active Publication Date: 2006-06-14
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: 40 kg of polyvinyl alcohol with a degree of polymerization of 1750±50 and a degree of alcoholysis of 95 mol% was added to 30.1 kg of a compound modifier containing alcohol amine, and swelled in a closed container at 20° C. under stirring. The modified polyvinyl alcohol is melted in a single-screw extruder at a temperature of 160℃. After the melt is filtered by a metal fiber filter element and measured by a spinning pump, it is removed from a spinneret with a pore size of 0.25mm and a temperature of 120℃. After spraying, the melt flows through a side air blower with a temperature of 60°C and a humidity of 70%, and then winds up. The spinneret is stretched 1.5 times, and the nascent fiber is stretched at 160-210°C with a stretching ratio of 10 times. After heat setting at 220°C for 2 minutes, a high-performance polyvinyl alcohol fiber with a strength of 11 cN / dtex, a single fiber fineness of 25 dtex, an elongation at break of 8-10%, and a modulus of 300 cN / dtex to ...

Embodiment 2

[0024] Example 2: 60 kg of polyvinyl alcohol with a degree of polymerization of 2200 and a degree of alcoholysis of 99 mol% was added to 42 kg of 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 hole diameter of 0.15mm , Winding after cooling by side blowing at a temperature of 30°C and a humidity of 70%. The spinneret is stretched to 2 times, the nascent fiber is stretched in three stages at 60-100℃, 130-160℃, 180-220℃, the total stretching ratio is 20 times, and the strength is obtained by heat setting at 230℃ for 0.5 minutes. Above 15cN / dtex, the single fiber fineness is 10dtex, the elongation at break is 6-8%, and the modulus is 350cN / dtex~370cN / dtex.

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 amino acid-containing solution and swelled in a mixer at 45° C. under stirring. The modified polyvinyl alcohol is added to an extrusion-spinning machine at 165°C for plasticization. After the melt is filtered and metered, it is sprayed from a spinneret with a temperature of 140°C and a hole diameter of 0.12mm, and the temperature is 30°C. , Winding after cooling with 75% humidity, the spinneret stretch ratio is 2 times. The wound fiber is stretched in a water bath at 40°C, stretched by dry heat 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 a wide range of uses. The high-performance fiber prepared from it has 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. It can also be used as tire cord, industrial cloth, high-performance ropes and plastics, rubber reinforcement materials, etc., which has great market potential. [0003] Polyvinyl alcohol is a crystalline polymer with a large number of hydroxyl groups in its 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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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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