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Method for preparing polyacrylonitrile-based thermal oxidation stabilized fibers

A technology of polyacrylonitrile-based thermal oxygen and polyacrylonitrile-based fibers, which is applied in the fields of fiber chemical characteristics, rayon chemical post-treatment, textiles and papermaking, etc., and can solve problems such as structural and performance defects

Inactive Publication Date: 2021-08-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides a method for preparing polyacrylonitrile-based thermo-oxidatively stabilized fibers to solve the structural and performance defects of polyacrylonitrile-based fibers in thermal-oxidative stabilization in the prior art

Method used

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  • Method for preparing polyacrylonitrile-based thermal oxidation stabilized fibers
  • Method for preparing polyacrylonitrile-based thermal oxidation stabilized fibers

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Electronic beam irradiation treatment for polypropylene-based fibers:

[0050] The polypropylene-based fibers were placed in the irradiation furnace and continuously in the electron beam irradiation source, and the modified polypropylene-based fibers were obtained. Among them, the two bundles of fibers in the irradiation furnace should take appropriate intervals to prevent fibers from generating and stripping in the electrical irradiation. During irradiation treatment, any impurity ingredients cannot be added or mixed in the irradiation furnace to avoid fibrous samples contaminated. Among them, the predetermined irradiation conditions include: the irradiation accelerator voltage is 1.5 MeV, the irradiation current is 35 mA, the irradiation dose is: the first irradiation dose (200 kGy), the second irradiation dose (800 kGy), the third irradiation Dosage (1000 kGy).

[0051] Pre-oxidation treatment for modified polypropylene-based fibers:

[0052] When the temperature of the ...

Embodiment 2

[0055] Electronic beam irradiation treatment for polypropylene-based fibers:

[0056] The polypropylene-based fibers were placed in the irradiation furnace and continuously in the electron beam irradiation source, and the modified polypropylene-based fibers were obtained. Among them, the two bundles of fibers in the irradiation furnace should take appropriate intervals to prevent fibers from generating and stripping in the electrical irradiation. During irradiation treatment, any impurity ingredients cannot be added or mixed in the irradiation furnace to avoid fibrous samples contaminated. Among them, the predetermined irradiation conditions include: the irradiation accelerator voltage is 1.5 MeV, the irradiation current is 35 mA, the irradiation dose is: the first irradiation dose (200 kGy), the second irradiation dose (800 kGy), the third irradiation Dosage (1000 kGy).

[0057] Pre-oxidation treatment for modified polypropylene-based fibers:

[0058] When the temperature of the ...

Embodiment 3

[0061] Electronic beam irradiation treatment for polypropylene-based fibers:

[0062] The polypropylene-based fibers were placed in the irradiation furnace and continuously in the electron beam irradiation source, and the modified polypropylene-based fibers were obtained. Among them, the two bundles of fibers in the irradiation furnace should take appropriate intervals to prevent fibers from generating and stripping in the electrical irradiation. During irradiation treatment, any impurity ingredients cannot be added or mixed in the irradiation furnace to avoid fibrous samples contaminated. Among them, the predetermined irradiation conditions include: the irradiation accelerator voltage is 1.5 MeV, the irradiation current is 35 mA, the irradiation dose is: the first irradiation dose (200 kGy), the second irradiation dose (800 kGy), the third irradiation Dosage (1000 kGy).

[0063] Pre-oxidation treatment for modified polypropylene-based fibers:

[0064] When the temperature of the ...

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Abstract

The invention discloses a method for preparing polyacrylonitrile-based thermal oxidation stabilized fibers. The method comprises the following steps of providing polyacrylonitrile-based fibers; carrying out electron beam irradiation treatment on the polyacrylonitrile-based fibers to obtain modified polyacrylonitrile-based fibers; and carrying out heat treatment on the modified polyacrylonitrile-based fibers according to a preset heat treatment temperature to obtain the polyacrylonitrile-based thermal oxidation stabilized fibers. According to the method, an electron beam irradiation treatment stage and a thermal oxidation stabilization stage are combined, and the electron beam irradiation treatment enables polymer macromolecular chains of the polyacrylonitrile-based fibers to generate cyclization reaction in the thermal oxidation stabilization process, so that the thermal oxidation stabilization process can be simplified; and the structure and the performance of the polyacrylonitrile-based thermal oxidation stabilized fibers are improved. Meanwhile, the polyacrylonitrile-based thermal oxidation stabilized fiber has good structure and performance, and a foundation is laid for preparing the carbon fiber with good structure and mechanical performance.

Description

Technical field [0001] The present application relates to the preparation of polyacrylonitrile-based thermal oxygen stabilization fibers, and more particularly to a method of preparing polyacrylonitrile thermal oxygen stabilization fibers. Background technique [0002] Polyacrylonitrile carbon fiber composites are excellent in performance than metal materials, ceramic materials, high strength, high modulus, high temperature, corrosion resistance. The preparation of polyacrylonitrile-based fibers to carbon fibers requires two main steps; thermal oxygen stabilization and carbonization. The most critical is to thermochemically reactions under the oxygen atmosphere, including a series of complex chemical reactions such as cyclized reactions, dehydrogenation reactions, and oxidative reactions. Since the cyclization speed is severe, the thermal oxygen stabilization process is uncontrollable, resulting in the presence of structural and performance defects in thermal oxygen stabilization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F11/16
CPCD01F9/225D01F11/16
Inventor 王晓旭陈静刘杰李世洋
Owner BEIJING UNIV OF CHEM TECH