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Preparation method of surface chemically modified flame retardant polyacrylonitrile fiber

A polyacrylonitrile fiber and fiber technology, applied in the direction of flame-retardant fiber, fiber treatment, fiber type, etc., can solve the problems of poor flame-retardant effect, high production cost, complicated production process of flame-retardant polyacrylonitrile fiber, etc., and achieve Low cost, excellent flame retardant performance, and low cost of raw materials

Active Publication Date: 2022-07-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the production process of flame-retardant polyacrylonitrile fiber is complex, the production cost is high, and the flame-retardant effect is poor in the prior art. It provides a preparation method of surface chemically modified flame-retardant polyacrylonitrile fiber. method, through the post-chemical modification treatment of polyacrylonitrile fibers, phosphorus-containing functional groups are introduced into the surface of the fibers, thereby endowing the finished fibers with good flame-retardant properties, which are simple and easy to implement and low in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The polyacrylonitrile fiber was added to a 20% hydrazine hydrate solution at 80°C with a liquor ratio (mass ratio) of 1:15, and stirred for a full reaction for 1 hour; the obtained fiber was washed with distilled water until the aqueous solution became neutral, and dried at 60°C back up. Then, the obtained fibers were added to a 30wt% aqueous solution of formaldehyde and phosphorous acid 1:1 at a liquor ratio (mass ratio) of 1:15, and heated under reflux for 1 h to fully contact the solvent and the fibers. Finally, the obtained fibers are dried at 60° C. to obtain the flame-retardant polyacrylonitrile fibers. Fiber LOI reached 20.5%.

Embodiment 2

[0029] The polyacrylonitrile fiber was added to a 20% hydrazine hydrate solution at 90°C with a liquor ratio (mass ratio) of 1:15, and stirred for a full reaction for 1 h; the obtained fiber was washed with distilled water until the aqueous solution became neutral, and dried at 60°C back up. Then, the obtained fibers were added to a 30wt% aqueous solution of formaldehyde and phosphorous acid 1:1 at a liquor ratio (mass ratio) of 1:15, and heated under reflux for 4 hours to fully contact the solvent and fibers. Finally, the obtained fibers are dried at 60° C. to obtain the flame-retardant polyacrylonitrile fibers. Fiber LOI reached 22.8%.

Embodiment 3

[0031] The polyacrylonitrile fiber was added to a 20% hydrazine hydrate solution at 100 °C with a liquor ratio (mass ratio) of 1:15, and stirred for a full reaction for 1 h; the obtained fiber was washed with distilled water until the aqueous solution became neutral, and dried at 60 °C back up. Then, the obtained fibers were added to a 30wt% aqueous solution of formaldehyde and phosphorous acid 1:1 at a liquor ratio (mass ratio) of 1:15, and heated under reflux for 4 hours to fully contact the solvent and fibers. Finally, the obtained fibers are dried at 60° C. to obtain the flame-retardant polyacrylonitrile fibers. Fiber LOI reached 24.2%.

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Abstract

The invention relates to a preparation method of surface chemically modified flame-retardant polyacrylonitrile fiber, which mainly solves the problems of complex production process, high production cost and poor flame-retardant effect of flame-retardant polyacrylonitrile fiber in the prior art. The preparation method of the surface chemically modified flame-retardant polyacrylonitrile fiber comprises the following steps: (1) adding the polyacrylonitrile fiber to an organic amine solution for amination reaction, then washing with water until the aqueous solution is neutral, and drying to obtain the amination polyacrylonitrile fiber; (2) adding the aminated polyacrylonitrile fiber obtained in step (1) into a mixed aqueous solution of aldehyde and a phosphorus-containing compound, and reacting to obtain the technical scheme of the flame-retardant polyacrylonitrile fiber, The problem is well solved, and it can be used in the industrial production of flame-retardant polyacrylonitrile fibers.

Description

technical field [0001] The invention relates to the technical field of preparation of flame-retardant polyacrylonitrile fibers. Specifically, the present invention relates to a surface chemically modified flame retardant polypropylene fiber without halogen elements and a preparation method thereof. [0002] technical background [0003] Polyacrylonitrile fiber (commonly known as acrylic fiber) is one of the three major synthetic fibers in the world. It is made of polyacrylonitrile or a copolymer containing more than 85% of acrylonitrile. It has good elasticity, soft hand feel and good warmth retention, similar to wool. , known as "synthetic wool", and it has good dyeability, bright color and no mildew, so it is widely used. However, its biggest disadvantage is that it is not flame retardant, and its oxygen index is only 17% to 18.5%, which is the lowest among synthetic fibers and is one of the most easily combustible synthetic fibers, which limits polyacrylonitrile to a larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/338D06M13/17D06M11/70D06M13/332D06M101/28
CPCD06M13/338D06M13/17D06M11/70D06M13/332D06M2101/28D06M2200/30
Inventor 董雪李应成沈志刚周勤灼
Owner CHINA PETROLEUM & CHEM CORP
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