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A melting preparation method of high-strength and high-modulus polyvinyl alcohol fiber

A polyvinyl alcohol fiber, high-strength and high-modulus technology, used in melt spinning, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of uneven particle size, uneven contact, uneven degree of swelling, etc. The effect of silk stability, swelling degree uniformity and production cost reduction

Active Publication Date: 2017-01-04
JIANGSU LIUJIA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the polyhydric strong hydrogen bond characteristics of polyvinyl alcohol, its melting point and decomposition temperature are close, making it difficult to process thermoplastically. In the prior art, nitrogen-containing compounds or polyhydric alcohols are often used to plasticize polyvinyl alcohol to achieve melt spinning, such as CN100339519 and CN102797050A respectively use nitrogen-containing compounds and amide compounds as plasticizers, and CN102776598A uses polyols as plasticizers. The common disadvantage of nitrogen-containing compounds and polyols is that they are easy to precipitate from the inside of the fiber, making the fiber brittle and reducing its mechanical properties At the same time, nitrogen-containing compounds are mostly toxic substances. If they are used in aquaculture and other industries that have safety requirements for fiber additives, plasticizers need to be extracted, which increases production costs and limits the application range of fibers.
[0004] The degree of swelling is another key factor affecting the melt spinning of polyvinyl alcohol. Compared with wet spinning, water is used as a plasticizer rather than a solvent, so the content is greatly reduced, which is easy to cause uneven contact. At the same time, the raw material of polyvinyl alcohol Most of them are granular materials with irregular shape and uneven particle size. If you continue to use simple mixed swelling method, it is easy to make the swelling degree uneven. If there is too much contact with liquid or the swelling degree of small particles is too large, the surface of the particles will show strong Viscous, which makes the particles agglomerate and difficult to feed, less contact with liquid or insufficient swelling of large particles, and the phenomenon of "cooking" occurs, and the original characteristics of polyvinyl alcohol are still maintained inside, so that the melt spinning cannot be carried out normally

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix 40 parts of 2,3-dihydroxypropionaldehyde, 5 parts of glycerol diacetate and 40 parts of water in a blender to prepare a composite plasticizer for use. 100 parts of the Add polyvinyl alcohol into the swelling kettle, and then add the prepared composite plasticizer from top to bottom in the form of mist spray, while stirring the solid polyvinyl alcohol to make the two evenly contact, and swell at 40°C for 16 hours. Fully swollen polyvinyl alcohol is melt-spun through a single-screw extruder, the feed section is 40-70°C, the compression section is 80-130°C, the metering section is 140-150°C, the spinning assembly is 130°C, and the hole diameter of the spinneret is 1mm , aspect ratio 1:15, as-spun fibers were dried in a hot air oven at 50°C for 12 minutes, then stretched at 100°C for a primary stretch, and the stretch ratio was 3 times, and for secondary stretching at 120°C, the stretch ratio 2.5 times, three-stage stretching at 130°C, the stretching ratio is 2 times, t...

Embodiment 2

[0022] Mix 20 parts of glycerol monoacetate and 50 parts of water in a mixer evenly to prepare a composite plasticizer for later use. Add 100 parts of polyvinyl alcohol with a degree of polymerization of 2000 and a degree of alcoholysis of 88% into the swelling tank and then prepare A good composite plasticizer is added from top to bottom in the form of mist spray, while stirring the polyvinyl alcohol solid to make the two evenly contact, swell at 60°C for 8 hours, and the fully swollen polyvinyl alcohol is extruded through a single screw Machine melt spinning, feed section 60-100°C, compression section 110-160°C, metering section 160-170°C, spinning assembly 160°C, spinneret hole diameter 3mm, aspect ratio 1:30, as-spun fibers at Dry in a hot air oven at 80°C for 10 minutes, then perform primary stretching at 120°C with a stretching ratio of 4 times, perform secondary stretching at 145°C with a stretching ratio of 2.5 times, and perform third-stage stretching at 160°C Stretch...

Embodiment 3

[0024] Mix 10 parts of dihydroxyacetone, 15 parts of methyl-α-D-glucoside, 5 parts of sucrose and 30 parts of water in a blender to prepare a composite plasticizer for use. 100 parts of polymerization degree 2200, alcoholysis degree Add 99% polyvinyl alcohol into the swelling kettle, then add the prepared composite plasticizer from top to bottom in the form of mist spray, and stir the polyvinyl alcohol solid at the same time to make the two evenly contact. Swell for 13 hours, the fully swollen polyvinyl alcohol is melt-spun through a single-screw extruder, the feed section is 40-80°C, the compression section is 80-120°C, the metering section is 130-150°C, the spinning assembly is 135°C, and the spinneret The pore diameter is 2.5mm, the length-to-diameter ratio is 1:25, the as-spun fibers are dried in a hot air oven at 30°C for 20 minutes, and then stretched at 80°C for the first stage, the stretching ratio is 5 times, and the second stretching is carried out at 115°C , the str...

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Abstract

The present invention relates to a melting preparation method of high-strength and high-modulus polyvinyl alcohol fibers. The method is as follows: 0-40 parts of carbohydrates, 0-20 parts of polyol ester and 30-60 parts of water are mixed to prepare a composite plasticizer, and the The compound plasticizer is added into 100 parts of polyvinyl alcohol to mix and swell in the way of spraying in the shape of a shape, and then melted and extruded by a single-screw extruder to obtain primary fibers. The primary fibers are dried, multi-stage stretched, and heat-set. High-strength and high-modulus polyvinyl alcohol fibers can be obtained. The advantages of the present invention are as follows: 1) The tensile strength of the prepared fiber is ≥1570MPa, the elastic modulus is ≥35.4GPa, and the elongation at break is ≤6.0%; 2) The composite plasticizer strengthens the interaction between water and macromolecules, Improve the spinning stability; 3) The plasticizer is not easy to migrate and precipitate, so that the mechanical properties of the fiber are stabilized; 4) The plasticizer is added to the polyvinyl alcohol in the form of mist spray to make the two evenly contact and ensure swelling The degree of uniformity ensures the uniformity of the finished fiber.

Description

technical field [0001] The invention relates to a method for preparing polyvinyl alcohol fibers, in particular to a method for preparing high-strength and high-modulus polyvinyl alcohol fibers by melt spinning. Background technique [0002] Polyvinyl alcohol fiber is a synthetic fiber made by spinning polyvinyl alcohol as raw material. Because of its good hydrophilicity, cohesiveness, impact resistance, and easy dispersion during processing, it is widely used as a reinforcing material in cement, asbestos boards, ceramic building materials, and polymer-based composite materials. It has good breaking strength, impact strength, weather resistance, and seawater corrosion resistance, and is suitable for various types of fishing nets, fishing gear, fishing lines, ropes, etc., and has good applications in marine fishing and transportation tools, etc. market. [0003] Traditional polyvinyl alcohol fibers are generally wet-spun. The cross-section of the primary fibers formed by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/50D01F1/10D01D5/098
Inventor 郭子贤刘伟昆王新鹏
Owner JIANGSU LIUJIA TECH CO LTD
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