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A kind of wet spinning method of polyacrylonitrile fiber and polyacrylonitrile fiber

A polyacrylonitrile fiber, wet spinning technology, applied in wet spinning, fiber chemical characteristics, single-component synthetic polymer rayon, etc. It can solve problems such as poor spinnability, low equipment requirements, and reduce fiber defects.

Active Publication Date: 2020-09-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventors of the present invention have found that the research of the prior art basically focuses on the improvement of the LOI (limiting oxygen index) of the polyacrylonitrile fiber, however, the resulting spinning solution has poor spinnability in the spinning process, and the resulting The decline in the mechanical properties of polyacrylonitrile fibers is less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Preparation of spinning solution: adopt initiator azobisisobutyronitrile to make main monomer acrylonitrile and comonomer vinylidene chloride carry out polymerization reaction in solvent dimethyl sulfoxide (wherein, acrylonitrile accounts for 1% of the total monomer mass 60%, vinylidene chloride accounts for 40% of the total monomer mass, the initiator consumption is 0.8% of the total monomer mass, the solvent consumption accounts for 70% of the polymerization system quality (that is, the total mass of reactants), and the polymerization reaction temperature is 70°C , reaction time 20h), to obtain a polymerization liquid; after the polymerization liquid is de-singled and defoamed, a spinning liquid is obtained. Wherein, the polymerization conversion rate is 96.2%, the solid content of the spinning solution is 30%, and the use temperature of the spinning solution is 60° C., and the spinning solution is spun.

[0070] Spinning: Wet spinning is adopted, and the diameter of ...

Embodiment 2

[0079] Preparation of spinning solution: use initiator azobisisobutyronitrile to make main monomer acrylonitrile and comonomer dibromoethylene carry out polymerization reaction in solvent dimethyl sulfoxide (wherein, acrylonitrile accounts for 1% of the total monomer mass 55%, dibromoethylene accounted for 45% of the total monomer mass, the initiator consumption was 0.8% of the total monomer mass, the solvent consumption accounted for 65% of the polymerization system quality, the polymerization reaction temperature was 65°C, and the reaction time was 16h), and the polymerization obtained liquid; after the polymerization liquid is de-singled and defoamed, the spinning liquid is obtained. Wherein, the polymerization conversion rate is 93.5%, the solid content of the spinning solution is 35%, and the use temperature of the spinning solution is 50° C., and the spinning solution is spun.

[0080] Spinning: Wet spinning is adopted, and the diameter of the spinneret hole is 0.075mm. ...

Embodiment 3

[0089]Preparation of spinning solution: use initiator azobisisobutyronitrile to make main monomer acrylonitrile and comonomer vinylidene chloride carry out polymerization reaction in solvent dimethylacetamide (wherein, acrylonitrile accounts for 1% of the total monomer mass 60%, vinylidene chloride accounts for 40% of the total monomer mass, the initiator consumption is 0.8% of the total monomer mass, the solvent consumption accounts for 60% of the polymerization system quality, the polymerization reaction temperature is 65 ° C, and the reaction time is 20h), and the polymerization liquid; after the polymerization liquid is de-singled and defoamed, the spinning liquid is obtained. Wherein, the polymerization conversion rate is 91.8%, the solid content of the spinning solution is 40%, and the use temperature of the spinning solution is 30° C., and the spinning solution is spun.

[0090] Spinning: Wet spinning is adopted, and the diameter of the spinneret hole is 0.1mm.

[0091...

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Abstract

The invention relates to polyacrylonitrile fibers and a wet spinning method thereof. According to the main technical scheme, the wet spinning method of the polyacrylonitrile fibers comprises the following steps: spinning: extruding a spinning solution through a spinning hole of a spinning assembly to obtain a spinning fine flow; solidifying and forming: enabling the spinning fine flow to enter a coagulation bath for coagulation forming to obtain nascent fibers; hot drafting treatment: carrying out multi-stage thermal drafting treatment on the nascent fibers; washing: washing the fibers subjected to hot drafting treatment; and drying and heat setting treatment: sequentially drying and heat-setting the washed fibers to obtain the polyacrylonitrile fibers. The polyacrylonitrile fibers are prepared by the wet spinning method of the polyacrylonitrile fibers. The polyacrylonitrile fibers are mainly used for ensuring the spinnability of the spinning solution in the spinning process, and the mechanical property of polyacrylonitrile fibers is improved.

Description

technical field [0001] The invention relates to the technical field of polyacrylonitrile fibers, in particular to a wet spinning method of polyacrylonitrile fibers and polyacrylonitrile fibers. Background technique [0002] Polyacrylonitrile fiber is one of the three major synthetic fibers in the world. It has the advantages of good elasticity, soft hand feeling and good warmth retention. It is known as "synthetic wool", so it is widely used in clothing, decoration, outdoor textiles and other fields. However, the limiting oxygen index LOI value of polyacrylonitrile fiber is only 17-18.5%. It is one of the most flammable synthetic fibers, and it is easy to cause fire and threaten people's life and property safety during use. Therefore, flame-retardant polyacrylonitrile fiber has also become a development and research hotspot in the synthetic fiber industry of various countries. [0003] Because the polymer chemical modification method has the advantages of less amount of fla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/06D01D5/14D01D10/02D01D10/06D01F6/40C08F220/44C08F214/08C08F214/00
CPCC08F214/08C08F220/44D01D5/06D01D5/14D01D10/02D01D10/06D01F6/40C08F214/00
Inventor 吕春祥赵宇飞李永红
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI