Method for modifying polyacrylonitrile by using electron beam irradiation

A technology of polyacrylonitrile fiber and electron beam irradiation, which is used in fiber processing, textile and papermaking, physical processing, etc., can solve problems such as lack of power, and achieve the effects of large processing capacity, improved pre-oxidation efficiency, and high radiation dose rate.

Active Publication Date: 2012-05-30
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For modified polymer materials, although gamma rays can also achieve certain effects, but for large-scale radiation modified polymer materials, it seems powerless

Method used

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  • Method for modifying polyacrylonitrile by using electron beam irradiation
  • Method for modifying polyacrylonitrile by using electron beam irradiation
  • Method for modifying polyacrylonitrile by using electron beam irradiation

Examples

Experimental program
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Effect test

Embodiment 1

[0035]Carry out according to the above implementation procedures, the irradiation sample is the PAN precursor (3K, that is, 3000 monofilaments / bundle, domestic, acrylonitrile content 96%) for the manufacture of carbon fiber, tiled in the tray, the apparent tiled thickness is about 3mm , the electron beam energy is 1.7MeV, the dose rate is 333Gy / s, the irradiation time is 600s, and the total irradiation dose is 200kGy.

Embodiment 2

[0037] According to the above implementation procedures, the irradiated samples are the same as in Example 1, tiled in the tray, the apparent tiled thickness of the samples is about 3mm, the electron beam energy is 1.7MeV, the dose rate is 333Gy / s, the irradiation time is 1500s, and the irradiation time is 1500s. The total dose is 500kGy, and the cyclization heat generation and density changes before and after preoxidation of the obtained irradiated samples are listed in Table 1.

Embodiment 3

[0039] According to the above implementation procedures, the irradiated samples are the same as in Example 1, tiled in the tray, the apparent tiled thickness of the samples is about 3mm, the electron beam energy is 1.7MeV, the dose rate is 1000Gy / s, the irradiation time is 100s, and the irradiation time is 100s. The total dose is 100kGy, and the cyclization heat generation and density changes before and after pre-oxidation of the obtained irradiated samples are listed in Table 1.

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Abstract

The invention provides a method for modifying polyacrylonitrile by using electron beam irradiation. The technical scheme adopted by the invention is as follows: by adjusting the irradiation dose rate of an electron accelcrator and controlling the total irradiation dose, the invention can achieve the purpose of modifying a polyacrylonitrile fiber sample, more particularly, being subjected to the electron beam irradiation, the invention can reduce the heat release of the cyclized polyacrylonitrile fiber in the process for heat treatment and obviously increase the pre-oxidation rate of the polyacrylonitrile fiber in air. Undergoing the changes in performance, the invention can accelerate the oxidation and greatly reduce the time for pre-oxidation in the process for the high-temperature cyclization or oxidation crosslinking of the polyacrylonitrile fiber, particularly, the process of precursor pre-oxidation crosslinking for preparing the polyacrylonitrile fiber. Accordingly, the method ofthe invention is of potential application value to the reduction in production cost for the polyacrylonitrile -based carbon fiber.

Description

technical field [0001] The invention relates to a method for modifying polyacrylonitrile fibers by electron beam irradiation, in particular to a method for modifying polyacrylonitrile fibers for producing carbon fibers. Background technique [0002] Cyclized and crosslinked polyacrylonitrile products can be prepared by heating and cyclizing polyacrylonitrile (PAN) fibers or oxidatively crosslinking by air heating. These products are high-quality flame-retardant materials and derive a series of downstream products, the most Important is polyacrylonitrile based carbon fiber. As we all know, carbon fiber has excellent performance and is widely used in cutting-edge fields such as aerospace, national defense and military, as well as many fields such as transportation, civil engineering, advanced sporting goods, and medical supplies. Polyacrylonitrile-based carbon fiber is the main method of producing carbon fiber. The manufacture of polyacrylonitrile-based carbon fiber includes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M10/00D06M101/28D01F9/22
Inventor 王谋华吴国忠刘伟华
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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