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A dry-jet wet spinning spinneret device and method

A technology of dry-jet wet spinning and spinneret, which is applied in the direction of spinneret assemblies, textiles and papermaking, etc. It can solve the problems of affecting silk performance, fine flow of spinning dope, and short distance, etc., to reduce holes, silk, etc. The effect of performance and dispersion improvement

Active Publication Date: 2017-06-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the distance between the spinneret and the liquid surface of the coagulation bath is very short, small fluctuations in the liquid surface and air flow disturbances will affect the fine flow of the spinning dope, thereby further affecting the performance of the silk

Method used

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  • A dry-jet wet spinning spinneret device and method
  • A dry-jet wet spinning spinneret device and method
  • A dry-jet wet spinning spinneret device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In the para-aramid spinning process, 100% concentrated sulfuric acid is used to dissolve the PPTA polymer. The logarithmic viscosity of PPTA is 5.8dL / g, and the concentration is 18%. The temperature is 85°C, the temperature of the heat-conducting medium in the jacket is 92°C, the temperature of the gas layer is 81°C, the thickness of the gas layer is 6mm, the concentration of sulfuric acid in the high-concentration coagulation bath layer is 91%, the thickness is 8mm, the concentration of sulfuric acid in the rest of the coagulation bath is 36%, and the spinning speed can be It reaches 750m / min, the finished silk strength is 21.5cN / dtex, and the strength cv value is 2.2%.

Embodiment 2

[0035] In the spinning process of aramid fiber III, DMAc is used to dissolve the polymer with a concentration of 4%, and the above-mentioned device is used for spinning and forming, wherein the temperature of the spinning solution is 52°C, the temperature of the heat-conducting medium in the jacket is 60°C, and the temperature of the gas layer is 64°C. The thickness of the gas layer is 3mm, the concentration of sulfuric acid in the high-concentration coagulation bath layer is 91%, the thickness is 9mm, the concentration of sulfuric acid in the rest of the coagulation bath is 36%, the spinning speed can reach 50m / min, the strength of as-spun silk is 4.6cN / dtex, and the strength cv value is 2.5%. .

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Abstract

The invention relates to a dry-jet wet-spinning spinneret plate device and method. The device comprises a spinneret plate and a jacket, the spinneret plate is placed in the jacket, and the front end face of the spinneret plate and the inner wall of the jacket form an inverted 'U'-shaped structure. The method includes the steps: connecting the dry-jet wet-spinning spinneret plate device with a spinning component; placing the front end of the jacket in a coagulating bath, keeping a certain distance between the front end of the spinneret plate and the liquid level of the coagulating bath to form a stable sealed gas layer among the front end of the spinneret plate, the inner wall of the jacket and the liquid level of the coagulating bath; spraying spinning size from the spinneret plate and forming a high-concentration coagulating bath layer with the spinning liquid solvent concentration of 90-100% on the liquid level of the coagulating bath finally contacting with the spinning size after a period of time. The influence of external disturbance on stock solution trickle can be decreased.

Description

technical field [0001] The invention relates to the field of steady-state spinneret technology, in particular to a dry-jet wet spinning spinneret device and method. Background technique [0002] The main feature of the dry-jet wet spinning process is that after the spinning stock solution is sprayed out through the spinneret hole, it does not immediately enter the coagulation bath, but first passes through a small air layer (generally less than 20-30mm) and then enters the coagulation bath for double diffusion, Phase separation and formation of fiber tows. Generally, the coagulation process of dry-jet wet spinning is very fast and can be completed within one second. Although the time is short, the fine flow of spinning dope before entering the coagulation bath is crucial to the solidification phase separation and fiber structure. In the air section, due to the huge difference in the mass distribution of the spinning dope and the external solvent, the solvent in the thin str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D4/00
CPCD01D4/00D01D4/025
Inventor 胡祖明陈蕾丁彬马禹王彦诸静
Owner DONGHUA UNIV