Safe solution spinning method

A technology of solution spinning and solvent spinning, which is applied in flash spinning, filament generation, rayon recycling, etc. It can solve the problems of ozone layer pollution, safe production and low explosion limit, so as to improve production safety and reduce organic compounds Content, the effect of reducing production costs

Active Publication Date: 2020-06-16
JIANGSU QINGYUN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Therefore, in order to solve the production safety problem when using the above-mentioned solvents that are not harmful to the ozone layer but have a low explosion limit for solution spinning, the application relates to a solution spinnin

Method used

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Examples

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Effect test

Embodiment 1

[0073] (1) producing a spinning solution, which includes a polymer and a spinning solvent;

[0074] The polymer used is polyester, and the content of polyester in the spinning solution is 10wt%;

[0075] The spinning solvent used is 1,1,1,3,3-pentafluorobutane;

[0076] (2) Nitrogen is passed into the spinning beam body 1 so that the oxygen content in the spinning beam body is less than or equal to 16vol%; the pipeline 7 of the non-combustible gas is set on the spinning beam body 1 for feeding Nitrogen is passed into; during the spinning process, the VOC-rich tail gas is discharged from the spinning housing through the discharge pipe 2 and enters the rich VOC tail gas treatment system 8, which sequentially includes a cooling device 3 and a VOC-rich tail gas treatment system 8 Adsorption device 4, through the treatment of cooling device 3 and adsorption device 4, obtains low-VOC gas (the content of its volatile organic compound is 500ppm), and low-VOC gas returns in the spinni...

Embodiment 2

[0080] (1) producing a spinning solution, which includes a polymer and a spinning solvent;

[0081] The polymer used is polyethylene, and the content of polyethylene in the spinning solution is 12wt%;

[0082] The spinning solvent used was 90% dichloromethane and 10% 1,1-difluoroethane (HC-152a).

[0083] (2) Pass into carbon dioxide gas in the spinning box body, make the oxygen content in the spinning box body be less than or equal to 16vol%; The pipeline 7 of incombustible gas is set on the described spinning box body 1, is used for to the spinning box body Nitrogen was introduced. During the spinning process, the VOC-rich tail gas is discharged from the spinning box through the discharge pipe 2 and enters the VOC-rich tail gas treatment system 8. The VOC-rich tail gas treatment system 8 only includes the adsorption device 4, and the adsorption device 4 process to obtain low-VOC gas (the content of its volatile organic compound is 700ppm), and the low-VOC gas returns to th...

Embodiment 3

[0087] (1) producing a spinning solution, which includes a polymer and a spinning solvent;

[0088] The polymer used is polyvinylidene fluoride, and the content of polyvinylidene fluoride in the spinning solution is 15wt%;

[0089] The spinning solvent used is cyclopentane.

[0090] (2) Pass into helium in the spinning box body, make the oxygen content in the spinning box body be less than or equal to 17vol%; The pipeline 7 of incombustible gas is set on the described spinning box body 1, is used for to the spinning box body Nitrogen was introduced. During the spinning process, the VOC-rich tail gas is discharged from the spinning box through the discharge pipe 2 and enters the VOC-rich tail gas treatment system 8. The VOC-rich tail gas treatment system 8 only includes the cooling device 3, and the cooling device 3 process to obtain low-VOC gas (the content of its volatile organic compound is 300ppm), and the low-VOC gas returns to the spinning beam body 1 again through the ...

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Abstract

The invention relates to a safe solution spinning method. The method is characterized in that in the solution spinning process, the oxygen content of mixed gas in a spinning box is controlled to be below 18vol%. By means of the method for introducing incombustible gas into the spinning box to reduce the oxygen content, the explosion risk in the solution spinning process is avoided, and the production safety is improved. The requirement for solvents can be reduced, the selection range of the solvents in the solution spinning process can be wider, the solvents are not limited to hydrocarbon solvents containing halogen, and hydrocarbon solvents (such as cyclopentane and cyclohexane) which have low flash points and only contain carbon atoms and hydrogen atoms can be adopted. In addition, by arranging a VOC-rich tail gas treatment system 8, the content of organic compounds in VOC-rich tail gas can be effectively reduced, and therefore low-VOC nitrogen is obtained, the tail gas in the spinning box can be recycled, and the production cost is reduced.

Description

technical field [0001] This application relates to a solution spinning method, especially in the solution spinning process, by controlling the oxygen content in the spinning box and recycling the spinning tail gas, so as to achieve the technology of improving production safety and reducing organic matter emissions Effect. Background technique [0002] Solution spinning refers to the method of quantitatively extruding the high polymer concentrated solution from the spinneret hole, and the solution flows through the coagulation bath or hot air or hot inert gas to solidify into fibers. In the prior art, polyacrylonitrile spinning and acetate fiber spinning are all prepared by solution spinning. [0003] The solution spinning method used to make ultrafine fibers usually uses high temperature and high pressure to dissolve the polymer in a certain solvent to make a spinning solution, and then spray it from the spinneret. Due to the rapid volatilization of the solvent, the high po...

Claims

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Application Information

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IPC IPC(8): D01D4/00D01D11/00D01D5/11D01F13/04
CPCD01D4/00D01D5/11D01D11/00D01F13/04Y02P70/62
Inventor 叶孔萌
Owner JIANGSU QINGYUN NEW MATERIAL TECH CO LTD
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