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Preparation method of flame-retardant polyacrylonitrile flame-retardant fiber containing high-stereotacticity polyacrylonitrile

A technology of polyacrylonitrile fiber and flame retardant fiber, which is applied in the direction of fiber type, fiber treatment, textile and papermaking, etc., can solve the problems of inability to promote the oxidation process obviously, the modification effect is not obvious, and it is unfavorable for industrial production, etc. Achieve the effect of being beneficial to molding preparation, improving spinnability, and increasing fiber density

Inactive Publication Date: 2013-12-18
SUZHOU LONGJIE SPECIAL FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the modifier cannot significantly promote the oxidation process of industrial acrylic fibers, the modification effect is not obvious, and the process equipment is complicated, which is not conducive to industrial production.

Method used

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  • Preparation method of flame-retardant polyacrylonitrile flame-retardant fiber containing high-stereotacticity polyacrylonitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the polyacrylonitrile copolymer fiber that is 35wt% with high stereotactic polyacrylonitrile content is raw material, and its monofilament hole number is 12000 12K, and fiber copolymer composition is: acrylonitrile monomer 90wt%, vinyl acetate 8wt% , Sodium methyl propyl sulfonate 2wt%, pass the fiber through a mixed aqueous solution of zinc chloride (wt%: 5%) and hydrochloric acid (wt%: 2%), the solution temperature is 50°C, and the modification time is 2min. The modified polyacrylonitrile fibers were dried in an air medium at 80° C. for 5 minutes. The fiber is pre-oxidized at 200°C to 280°C, the pre-oxidation atmosphere is air, and the temperature is raised in four stages. A total of 9% draft was applied. A polyacrylonitrile-based flame-retardant fiber (preoxidized fiber) was obtained.

Embodiment 2

[0018] Embodiment 2: The acrylic fibers used are the same as in Embodiment 1. Pass the fiber through a mixed aqueous solution of zinc chloride (wt%: 5%) and hydrochloric acid (wt%: 2%), the solution temperature is 80° C., and the modification time is 2 minutes. The modified polyacrylonitrile fibers were dried in an air medium at 80° C. for 5 minutes. The obtained fibers were pre-oxidized under the pre-oxidation conditions as in Example 1 to obtain pre-oxidized fibers (ie, polyacrylonitrile-based flame-retardant fibers).

Embodiment 3

[0019] Embodiment 3: The acrylic fibers used are the same as in Embodiment 1. Pass the fiber through a mixed aqueous solution of zinc chloride (wt%: 5%) and hydrochloric acid (wt%: 2%), the solution temperature is 90° C., and the modification time is 2 minutes. The modified polyacrylonitrile fibers were dried in an air medium at 80° C. for 5 minutes. The obtained fibers were pre-oxidized under the pre-oxidation conditions as in Example 1 to obtain pre-oxidized fibers (polyacrylonitrile-based flame-retardant fibers).

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Abstract

The invention relates to a preparation method of a polyacrylonitrile-base flame-retardant fiber from polyacrylonitrile acrylon grey yarn. The method comprises the following steps: impregnating the raw material polyacrylonitrile fiber with the high-stereotacticity polyacrylonitrile of 30-50 wt% in a ZnCl2-acid mixed water solution modifier at 45-110 DEG C to carry out chemical modification for 1-10 minutes, wherein 0-+10% extensibility drawing is applied to the fiber in the modification process; drying the impregnation-modified polyacrylonitrile acrylon fiber in an air medium at 80-140 DEG C for 1-10 minutes to obtain the modified polyacrylonitrile acrylon fiber; and preoxidating the modified polyacrylonitrile acrylon fiber to obtain the polyacrylonitrile-base flame-retardant fiber, wherein in the ZnCl2-acid mixed water solution modifier, the mass percent of the ZnCl2 is 2-18%, and the mass percent of the acid is 1-10%.

Description

technical field [0001] The invention relates to a method for preparing polyacrylonitrile-based flame-retardant fibers, which uses polyacrylonitrile-based fiber precursors to prepare flame-retardant fibers. Background technique [0002] Natural or synthetic fibers have different flammability due to their different chemical structures. According to the characteristics of ignition degree, burning speed, and extinguishing properties during combustion, fibers can be qualitatively divided into flame-retardant fibers and non-flame-resistant fibers. category. At present, LOI (Limit Oxygen Index) is widely used in the world to characterize the flammability of fibers and their products. The larger the LOI value, the higher the oxygen concentration required for the material to burn, that is, the harder it is to burn. Usually the volume fraction of oxygen in the air is close to 20, so the fibers can also be classified according to the LOI value. The LOI value below 20 is called flamma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/155D06M11/11D06M13/188D06M11/55D06M11/34D06M101/28
Inventor 徐醒我关乐赵满才
Owner SUZHOU LONGJIE SPECIAL FIBER
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