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Method for preparing polyacrylonitrile-based flame-retardant fiber

A polyacrylonitrile-based, flame-retardant fiber technology, applied in fiber treatment, fiber types, textiles and papermaking, etc., can solve the problems that the oxidation process cannot be significantly promoted, unfavorable for industrial production, and the modification effect is not obvious. It is beneficial to forming preparation, improving spinnability and increasing fiber density

Inactive Publication Date: 2009-11-25
BEIJING UNIV OF CHEM TECH
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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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: take the general industrial polyacrylonitrile copolymer fiber produced by Shanghai Petrochemical Co., Ltd. as raw material, its single-filament hole number is 12K of 12000, and the fiber copolymer is composed of: 90wt% of acrylonitrile monomer, 8wt% of vinyl acetate, formaldehyde Sodium 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

[0019] Embodiment 2: the common industrial 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 2min. 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

[0020] Embodiment 3: the common industrial 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 2min. 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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PUM

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Abstract

The invention relates to a method for preparing polyacrylonitrile-based flame-retardant fiber. The method comprises the following steps: impregnating common industrial polyacrylonitrile acrylic fiber in aqueous solution with mixed ZnCl2 and acid to perform impregnation chemical modification; drawing the fiber simultaneously during modification; drying the acrylic fiber after impregnation and modification in an air medium; obtaining modified acrylic fiber; pre-oxidizing the modified acrylic fiber; and obtaining the polyacrylonitrile-based flame-retardant fiber. The chemical modification of the invention can improve thermal reaction performance of civil industrial fiber, reduce the heat release of thermal reaction, advance the initial temperature of thermal chemical reaction and reduce the phenomenon of melting / merging fiber yarn. The flame-retardant fiber finally obtained has the tensile strength up to more than 0.2 GPa and has the limiting oxygen index up to more than 40. The method is applicable to common industrial acrylic fiber between 1 and 320 k.

Description

technical field [0001] The invention relates to a method for preparing polyacrylonitrile-based flame-retardant fibers. The flame-retardant fibers can be prepared from common industrial polyacrylonitrile-based raw silks. 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, the 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 air The volume fraction of oxygen in the fiber is close to 20, so the fiber can also be classified according to the LOI value. The LOI value low...

Claims

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Application Information

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IPC IPC(8): D06M11/155D06M11/11D06M13/188D06M11/55D06M11/34D06M101/28
Inventor 刘杰王超梁节英马兆昆
Owner BEIJING UNIV OF CHEM TECH