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Modified polyacrylonitrile-nylon 66 composite fiber membrane as well as preparation method and application thereof

A composite fiber membrane, polyacrylonitrile technology, applied in the direction of fiber processing, fiber type, conjugated synthetic polymer rayon, etc., can solve the problem of poor compatibility, unsatisfactory effect, amidoxime-based polyacrylonitrile fiber membrane Poor mechanical strength, etc.

Active Publication Date: 2021-11-30
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength of the amidoxime-based polyacrylonitrile fiber membrane prepared by this method is relatively poor.
At the same time, due to the poor compatibility of amidoxime-based polyacrylonitrile spinning solution, the effect of improving the mechanical strength of fibers by solution blending and adding reinforcing components is not ideal.

Method used

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  • Modified polyacrylonitrile-nylon 66 composite fiber membrane as well as preparation method and application thereof
  • Modified polyacrylonitrile-nylon 66 composite fiber membrane as well as preparation method and application thereof
  • Modified polyacrylonitrile-nylon 66 composite fiber membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0052] The dry polyacrylonitrile powder and solvent A are mixed in a water bath at a first temperature and magnetic stirring for a first time to obtain a polyacrylonitrile solution. reacting hydroxylamine hydrochloride and polyacrylonitrile solution in a water bath at a second temperature and magnetic stirring for a second time to obtain a mixed solution; mixing the mixed solution with potassium hydroxide solid, and then reacting at a third temperature for a third time to obtain a reaction product . The reaction product is cooled to room temperature, then centrifuged, and the supernatant is taken to obtain amidoxime polyacrylonitrile spinning solution.

[0053] Mix nylon 66 solid particles with solvent B, react for a fourth time in a water bath at a fourth temperature and magnetic stirring, and cool to room temperature to obtain a nylon 66 spinning solution.

[0054] The amidoxime polyacrylonitrile spinning solution was placed in syringe A, the nylon 66 spinning solution was ...

experiment example

[0061] Tensile strength: The tensile strength of the composite fiber membrane was measured by an electronic universal testing machine.

[0062] Uranium removal performance test: Weigh 0.1g composite fiber membrane and put it in 1L of uranyl ion mass concentration of 1.5mg / L, nitrate mass concentration of 50g / L, chloride mass concentration of 5g / L, carbonate mass concentration of 60mg / L, the pH of the solution is 7.0, the uranium-containing wastewater is used for adsorption test, the adsorption temperature is 25°C, and the adsorption time is 24h. After adsorption, the supernatant is taken to analyze the concentration of uranium (VI) ions; The method stipulated in 2014 was tested.

[0063] Table 2

[0064]

[0065] Depend on figure 1 It can be seen that the diameter of the fibers in the modified polyacrylonitrile-nylon 66 composite fiber membrane ranges from 180 to 350 mm, and the fiber surface is flat and smooth without rough cracks.

[0066] Depend on figure 2 It can b...

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Abstract

The invention discloses a modified polyacrylonitrile-nylon 66 composite fiber membrane as well as a preparation method and application thereof. The preparation method comprises the following steps of (1) fixing a spraying device A with an amidoxime polyacrylonitrile spinning solution and a spraying device B with a nylon 66 spinning solution on a double-nozzle electrostatic spinning machine, and performing electrostatic spinning to obtain an amidoxime polyacrylonitrile-nylon 66 composite fiber membrane; and (2) reacting the amidoxime polyacrylonitrile-nylon 66 composite fiber membrane with a hydroxide solution of alkali metal to obtain the modified polyacrylonitrile-nylon 66 composite fiber membrane. The composite fiber membrane has excellent tensile strength and keeps a good removal effect on uranium ions in nitrate-containing wastewater.

Description

technical field [0001] The invention relates to a modified polyacrylonitrile-nylon 66 composite fiber membrane and its preparation method and application, in particular to a carboxyl / amidoxime-based polyacrylonitrile-nylon 66 composite fiber membrane and its preparation method and application. Background technique [0002] A large amount of uranium-containing wastewater will be produced in the process of uranium mining, smelting, refining and nuclear fuel element manufacturing. The uranium-containing wastewater is characterized by low uranium concentration, large volume, and complex chemical composition, which poses a huge threat to the ecological environment. threat. At present, a large amount of uranium-containing wastewater containing nitrate will be produced in the process of uranium purification in our country. In addition to low-concentration uranium and high-concentration nitrate, these uranium-containing wastewater also contain a large amount of impurity ions, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/43D04H1/4334D04H1/728D01F8/12D01F8/08D06M11/38D06M101/28D06M101/34
CPCD04H1/43D04H1/4334D04H1/728D01F8/12D01F8/08D06M11/38D06M2101/28D06M2101/34Y02P10/20
Inventor 宋艳陈树森宿延涛李默王海珍勾阳飞
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY