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Cross-linked polyacrylonitrile-based amidoxime fiber, method for preparing same and application of cross-linked polyacrylonitrile-based amidoxime fiber

A polyacrylonitrile-based amidoxime and polyacrylonitrile fiber technology, which is applied in the field of fiber materials, can solve the problems of dissolution loss, poor fiber recycling performance, etc., and achieves high anti-swelling performance, high hydrolysis resistance, and long cycle life. Effect

Inactive Publication Date: 2017-06-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, further research on it found that the recycling performance of the fiber is poor, and it will continue to dissolve and lose during the long-term adsorption of high-temperature lye.

Method used

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  • Cross-linked polyacrylonitrile-based amidoxime fiber, method for preparing same and application of cross-linked polyacrylonitrile-based amidoxime fiber
  • Cross-linked polyacrylonitrile-based amidoxime fiber, method for preparing same and application of cross-linked polyacrylonitrile-based amidoxime fiber
  • Cross-linked polyacrylonitrile-based amidoxime fiber, method for preparing same and application of cross-linked polyacrylonitrile-based amidoxime fiber

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Effect test

Embodiment 1

[0045] Embodiment 1 Preparation of cross-linked polyacrylonitrile amidoxime fiber of the present invention

[0046] (1) 2.12g polyacrylonitrile fiber (containing 0.04mol cyano group), 0.2mol triethylenetetramine, 0.2molH 2 O was reacted in a 100mL round-bottom flask at a reaction temperature of 120 °C for 1 h. After the reaction, the cross-linked fibers were washed and vacuum-dried at 60° C. to obtain cross-linked polyacrylonitrile fibers 120-1.

[0047] (2) According to the ratio of 1g polyacrylonitrile fiber raw material corresponding to 10g hydroxylamine hydrochloride and 5.5g sodium carbonate, get cross-linked polyacrylonitrile fiber 120-1 and hydroxylamine hydrochloride / sodium carbonate generation amidoximation reaction, adjust initial pH =7, T=70°C, the cross-linked polyacrylonitrile amidoxime fiber 120-1-Am was obtained.

Embodiment 2

[0048] Example 2 Preparation of cross-linked polyacrylonitrile amidoxime fiber of the present invention

[0049] According to the method of Example 1, the difference is that the reaction temperature in step (1) is 130° C., and the cross-linked polyacrylonitrile fiber 130-1 and the cross-linked polyacrylonitrile amidoxime fiber 130-1-Am are prepared.

Embodiment 3

[0050] Example 3 Preparation of cross-linked polyacrylonitrile amidoxime fiber of the present invention

[0051] According to the method of Example 1, the difference is that the reaction temperature in step (1) is 140° C. to prepare cross-linked polyacrylonitrile fiber 140-1 and cross-linked polyacrylonitrile amidoxime fiber 140-1-Am.

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Abstract

The invention provides a cross-linked polyacrylonitrile-based amidoxime fiber. A method for preparing the cross-linked polyacrylonitrile-based amidoxime fiber includes steps of (1), carrying out cross-linking on polyacrylonitrile fibers by the aid of triethylenetetramine to obtain cross-linked polyacrylonitrile fibers; (2), carrying out amidoximation on the cross-linked polyacrylonitrile fibers obtained at the previous step by the aid of hydroxylammonium chloride to obtain the cross-linked polyacrylonitrile-based amidoxime fiber. The cross-linked polyacrylonitrile-based amidoxime fiber and the method have the advantages that the problem that common amidoxime fibers cannot be directly applied to Bayer solution for extracting gallium can be effectively solved; the cross-linked polyacrylonitrile-based amidoxime fiber is high in mechanical strength and high in gallium adsorption capacity and selectivity and has a broad market prospect.

Description

technical field [0001] The invention relates to the field of fiber materials, in particular to a cross-linked polyacrylonitrile amidoxime fiber and its preparation method and application. Background technique [0002] Gallium is an important rare metal. Semiconductor materials and special alloys composed of gallium and other elements have extremely important applications in aerospace, electronics industry, new energy, communications and other fields. The concentration of gallium in bauxite ore is 20-80 ppm. During the production of alumina by the Bayer process, about 70% of the gallium enters the strong alkaline Bayer solution, and the remaining 30% enters the red mud. Gallium in Bayer solution as sodium gallate [NaGa(OH) 4 ] form, and the circulating accumulation reaches 100-300mg / L. About 90% of gallium in the world is obtained from the mother liquor (Bayer solution) of producing alumina by Bayer process. [0003] Gallium recovery methods currently include amalgam meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62C02F101/20
CPCB01J20/261C02F1/285C02F2101/20
Inventor 邹华维梁梅彭雪松杨团团陈洋
Owner SICHUAN UNIV
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