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Wet spinning method for polyacryl-nitrile fibre

A polyacrylonitrile fiber, wet spinning technology, applied in the direction of wet spinning, fiber chemical characteristics, single-component synthetic polymer rayon, etc., can solve the problem of high corrosion resistance requirements of production equipment and poor production and operation environment , strong corrosiveness of sodium thiocyanate and other issues, to achieve the effects of environmental protection, control, and strong solubility

Inactive Publication Date: 2008-01-16
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of dry spinning is that the process and equipment are relatively simple, but the disadvantage is that solvent recovery is difficult, the cost is high, and due to the volatile nature of the solvent, the air pollution in the production environment is serious. Therefore, wet spinning is still an industrial manufacturing method. Polyacrylonitrile fibers are mostly used in the process
The solvent used in traditional wet spinning is mainly sodium thiocyanate aqueous solution. The advantage of this process route is that the production operation cost is relatively low and the product quality is stable, but its disadvantage is that sodium thiocyanate has strong corrosion resistance. Therefore, the corrosion resistance requirements for production equipment are extremely high, and the environment for production operations is also poor.

Method used

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  • Wet spinning method for polyacryl-nitrile fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The polyacrylonitrile resin is uniformly mixed with the ionic liquid to form a slurry, and the content of the polyacrylonitrile resin in the slurry is 12 wt%. Swell at a temperature of 18°C ​​for 45 minutes, then heat up to 95°C and dissolve for 2.5 hours to form a uniform solution to make a spinning dope. The spinning stock solution is spun after filtering and defoaming, and the temperature of the stock solution is 115°C. The coagulation bath is an aqueous solution of ionic liquid, wherein the content of the ionic liquid is 24wt%, and the temperature of the coagulation bath is 45°C.

[0022] The ionic liquid adopted has the following structural formula:

[0023]

[0024] The spinning speed is 8m / min, and the coagulated and formed fibers are processed by subsequent processes such as washing, stretching, drying and setting, crimping and cutting to obtain polyacrylonitrile staple fibers with a specification of 2.2dtex×50mm. The measured breaking strength was 3.4 cN / d...

Embodiment 2

[0026] The polyacrylonitrile resin was uniformly mixed with the ionic liquid to form a slurry, and the content of the polyacrylonitrile resin in the slurry was 11 wt%. Swell at a temperature of 16°C for 65 minutes, then raise the temperature to 55°C and dissolve for 3.5 hours to form a uniform solution to make a spinning dope. The spinning stock solution is spun after filtering and defoaming, and the temperature of the stock solution is 110°C. The coagulation bath is an aqueous solution of ionic liquid, wherein the content of the ionic liquid is 25 wt%, and the temperature of the coagulation bath is 38°C.

[0027] The ionic liquid adopted has the following structural formula:

[0028]

[0029] The spinning speed is 7m / min, and the coagulated and formed fibers are processed by washing, stretching, drying and setting, crimping and cutting to obtain short polyacrylonitrile fibers with a specification of 3.6dtex×65mm. The measured breaking strength was 2.5 cN / dtex and the bre...

Embodiment 3

[0031] The polyacrylonitrile resin is uniformly mixed with the ionic liquid to form a slurry, and the content of the polyacrylonitrile resin in the slurry is 30 wt%. Swell at a temperature of 40°C for 35 minutes, then raise the temperature to 110°C and dissolve for 3 hours to form a uniform solution to make a spinning dope. The spinning stock solution is spun after filtering and defoaming, and the temperature of the stock solution is 120°C. The coagulation bath is an aqueous solution of ionic liquid, wherein the content of the ionic liquid is 35 wt%, and the temperature of the coagulation bath is 60°C.

[0032] The ionic liquid adopted has the following structural formula:

[0033]

[0034] The spinning speed is 8m / min, and the coagulated fibers are washed, stretched, dried and shaped, crimped and cut to obtain short polyacrylonitrile fibers with a specification of 3.2dtex×65mm. The measured breaking strength was 2.9 cN / dtex and the breaking elongation was 35%.

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Abstract

The wet spinning method of pelyacrylonitrile fibre includes the following steps: dissolving fibre-grade polyacrylonitrile resin in the solvent to obtain spinning solution, making the spinning solution be passed through spinneret component to form primary fibre, then making the primary fibre be passed through a coagulating bath and coagulated to form the invented fibre. Said invention also provides the chemical structure formula of said solvent, and the polyacrylonitrile resin content in the spinning solution is 10-35 wt%.

Description

technical field [0001] The invention relates to a wet spinning method of polyacrylonitrile fibers, in particular to a wet spinning method of polyacrylonitrile fibers using ionic liquid as a solvent. Background technique [0002] The performance of polyacrylonitrile fiber is similar to that of wool, and it occupies a large proportion in the total production of synthetic fibers. However, polyacrylonitrile resin, the raw material for making polyacrylonitrile fibers, has a defect, that is, its melting point (theoretical value is 319°C) is higher than the decomposition temperature (generally 250°C), so it cannot be processed by melting, and usually only a solution can be used. Manufactured by the spinning method, that is, dissolving polyacrylonitrile resin in a solvent to form a spinning stock solution, and the solvent in the nascent fiber overflows and solidifies to form a fiber. In the prior art, solvents are mainly divided into two categories: volatile organic solvents and aq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/06D01F6/18
Inventor 林耀张玉梅黄翔宇王彪裴福沪王华平
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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