Preparation method of melt-spun special-shaped polyvinyl alcohol fiber

A technology of polyvinyl alcohol fiber and polyvinyl alcohol, which is applied in fiber processing, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of large degree of irregularity and difficulty in obtaining controllable cross-section, and achieve large degree of irregularity and improved Spinnability, effect of small change in shear viscosity

Active Publication Date: 2022-02-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing melt-spun special-shaped polyvinyl alcohol fibers to solve the problem that it is difficult to obtain special-shaped polyvinyl alcohol fibers with a controllable cross-section, a large degree of special shape, and a high degree of special shape.

Method used

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  • Preparation method of melt-spun special-shaped polyvinyl alcohol fiber
  • Preparation method of melt-spun special-shaped polyvinyl alcohol fiber
  • Preparation method of melt-spun special-shaped polyvinyl alcohol fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In the preparation method of the melt-spun special-shaped polyvinyl alcohol fiber in this embodiment, the special-shaped spinneret microholes of the spinneret adopt a four-lobed shape, and the degree of special shape is 50%. It includes the following steps:

[0045] (1) The chemically modified polyvinyl alcohol powder is melt-spun on extrusion-spinning equipment, and after melt-extruding, filtering and metering, it is sprayed from the special-shaped spinning micropores, and the melt is The special-shaped polyvinyl alcohol primary fiber is prepared by blowing and cooling on the side of the thin stream; wherein, the step of chemically modifying the polyvinyl alcohol powder includes: copolymerizing polyvinyl monomers on the polyvinyl alcohol molecular chain.

[0046] Among them, the spinning temperature is 165°C; the spinning shear rate is 10000s -1 ; Spinning shear viscosity is 300Pa.s; spinning pressure is 25MPa; spinning volume flow rate is 300mm 3 / s; spinneret draw ...

Embodiment 2

[0050] In the preparation method of the melt-spun special-shaped polyvinyl alcohol fiber in this embodiment, the special-shaped spinneret microholes of the spinneret are flat and wavy, and the degree of special shape is 90%. It includes the following steps:

[0051] (1) The chemically modified polyvinyl alcohol powder is melt-spun on extrusion-spinning equipment, and after melt-extruding, filtering and metering, it is sprayed from the special-shaped spinning micropores, and the melt is The special-shaped polyvinyl alcohol primary fiber is prepared by blowing and cooling on the side of the thin stream; wherein, the step of chemically modifying the polyvinyl alcohol powder includes: grafting n-butyl boric acid on the polyvinyl alcohol molecular chain.

[0052] Among them, the spinning temperature is 180°C; the spinning shear rate is 6000s -1 ; Spinning shear viscosity is 200Pa.s; spinning pressure is 30MPa; spinning volume flow rate is 250mm 3 / s; the draw ratio of the spinner...

Embodiment 3

[0056] In the preparation method of the melt-spun special-shaped polyvinyl alcohol fiber in this embodiment, the special-shaped spinneret microholes of the spinneret adopt a trilobal shape, and the degree of special shape is 75%. It includes the following steps:

[0057] (1) The physically modified polyvinyl alcohol powder is melt-spun on extrusion-spinning equipment, and after melt-extruded, filtered and metered, it is ejected from the micro-pores of the special-shaped spinneret, and the melt is Cooling with side air blowing in a thin stream to prepare shaped polyvinyl alcohol primary fibers; wherein, the step of physically modifying polyvinyl alcohol powder includes: mixing and compounding glycerin, starch and polyvinyl alcohol according to the mass ratio of 10:30:60 to obtain modified polyvinyl alcohol fibers. Non-toxic polyvinyl alcohol powder.

[0058] Among them, the spinning temperature is 175°C; the spinning shear rate is 2000s -1 ; Spinning shear viscosity is 150Pa....

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Abstract

The invention discloses a method for preparing melt-spun special-shaped polyvinyl alcohol fibers, and belongs to the technical field of preparation of special-shaped polyvinyl alcohol fibers. It comprises the following steps: the modified polyvinyl alcohol powder is melt-spun on extrusion-spinning equipment, and after being melt-extruded, filtered and metered, it is sprayed from a spinneret containing special-shaped spinneret micropores, And blowing and cooling the melt fine stream side to produce special-shaped polyvinyl alcohol primary fibers; after multi-stage stretching, wet heat stretching or dry heat stretching and heat setting, the special-shaped polyvinyl alcohol primary fibers are prepared into melt-spun special-shaped Polyvinyl alcohol fibers. The preparation method of melt-spun special-shaped polyvinyl alcohol fibers of the present invention realizes stable and continuous melt spinning of polyvinyl alcohol fibers, and can obtain as-spun fibers with triangular, three-lobed, four-lobed or flat wavy cross-sections , after subsequent stretching and heat setting processes, melt-spun shaped polyvinyl alcohol fibers that can be used to reinforce and toughen composite materials have been successfully prepared. The melt-spun shaped polyvinyl alcohol fibers have high strength and good shape retention.

Description

technical field [0001] The invention relates to the technical field of preparation of special-shaped polyvinyl alcohol fibers, in particular to a preparation method of melt-spun special-shaped polyvinyl alcohol fibers. Background technique [0002] Shaped fiber is a kind of differentiated fiber with special cross-sectional shape and function spun by special method. Ordinary circular cross-section fibers have weak surface gloss and waxy feeling, and have disadvantages such as easy to get dirty, easy to pilling, non-absorbent, and small coverage. Compared with the circular cross-section fiber, the chemical composition of the special-shaped cross-section fiber has not changed, but the change of the cross-sectional shape of the fiber endows the special-shaped fiber with better performance characteristics than ordinary chemical fibers. Such as unique luster and stain resistance, different hand feeling and excellent anti-pilling properties, the fabric woven by it is thicker, fluf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/34D01F6/14D01F6/50D01F1/10D01D5/253
CPCD01F6/34D01F6/14D01F6/50D01F1/10D01D5/253
Inventor 陈宁王萌王琪李莉周婷
Owner SICHUAN UNIV
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