Method for preparing polyacrylonitrile carbon fiber with gamma ray irradiation

A technology of polyacrylonitrile carbon fiber and polyacrylonitrile fiber, which is applied in the field of preparation of polyacrylonitrile carbon fiber, can solve problems affecting the mechanical properties of carbon fiber, achieve the effects of shortening stabilization time, high rigidity drafting, and improving orientation degree

Inactive Publication Date: 2015-07-22
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, although the molecular orientation degree of PAN precursors can reach more than 90% by means of high-temperature water vapor drawing, due to the characteristics of its flexible cha

Method used

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  • Method for preparing polyacrylonitrile carbon fiber with gamma ray irradiation
  • Method for preparing polyacrylonitrile carbon fiber with gamma ray irradiation

Examples

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Example Embodiment

[0021] Example 1

[0022] Select 3K (that is, 3000 filaments / bundle) of polyacrylonitrile precursor yarn containing acrylamide copolymer (denoted as: original yarn A), and first perform it in an air atmosphere 60 Coγ-ray irradiation, the irradiation dose rate is 1kGy / h, the irradiation time is 50h, the total irradiation dose is 50kGy, and the irradiation modified "cold crosslinked" polyacrylonitrile fiber is obtained. Then, the radiation-modified polyacrylonitrile fiber is subjected to thermal stabilization treatment in five temperature ranges of 200℃, 220℃, 235℃, 250℃ and 280℃ in air medium. The residence time of each temperature zone is 15min. A total of 75min. The tension control is as follows: the tension control of the first and second temperature zone is 30MPa, the tension control of the third temperature zone is 24MPa, and the tension control of the third temperature zone is 30MPa. Get heat stabilized fiber. Under the protection of nitrogen, the thermally stabilized fibe...

Example Embodiment

[0025] Example 2

[0026] The fiber sample is the same as in Example 1. First, it is carried out in an air atmosphere 60 Coγ-ray irradiation, the irradiation dose rate is 1kGy / h, the irradiation time is 100h, the total irradiation dose is 100kGy, and the irradiation modified "cold crosslinked" polyacrylonitrile fiber is obtained. Then the radiation-modified polyacrylonitrile fiber is subjected to thermal stabilization treatment in five temperature ranges of 200℃, 220℃, 235℃, 250℃ and 280℃ in air medium, and the residence time of each temperature zone is 12.5min. , A total of 60min. The tension control is as follows: the tension control in the first and second temperature zone is 35MPa, the tension control in the third temperature zone is 26MPa, and the tension control in the third temperature zone is 35MPa. Get heat stabilized fiber. The thermally stabilized fiber is carbonized at a temperature of 400℃, 450℃, 600℃ and 850℃ under the protection of nitrogen. The residence time is...

Example Embodiment

[0027] Example 3

[0028] The fiber sample is the same as in Example 1. First, it is carried out in an air atmosphere 60 Coγ-ray irradiation, the irradiation dose rate is 2kGy / h, the irradiation time is 100h, the total irradiation dose is 200kGy, and the irradiation modified "cold crosslinked" polyacrylonitrile fiber is obtained. Then, the radiation-modified polyacrylonitrile fiber is subjected to thermal stabilization treatment in five temperature ranges of 200℃, 220℃, 235℃, 250℃ and 280℃ in air medium, and the residence time of each temperature zone is 11min. A total of 55 minutes. The tension control is as follows: the tension control of the first and second temperature zone is 37.5MPa, the tension control of the third temperature zone is 28MPa, and the tension control of the third temperature zone is 37.5MPa. Get heat stabilized fiber. Under the protection of nitrogen, the thermally stabilized fiber is carbonized at a low temperature at 400℃, 450℃, 600℃ and 850℃, with a res...

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Abstract

The invention relates to a method for preparing polyacrylonitrile carbon fiber with gamma ray irradiation. The method comprises the following steps: carrying out appropriate doses of gamma ray irradiation for polyacrylonitrile fiber in air, vacuum or inert atmosphere, and thus generating part of cyclization and crosslinking structure; carrying out thermal oxidation stabilization for 0-100 min in air atmosphere to achieve full cyclization and crosslinking; carrying out low-temperature carbonization and high-temperature carbonization so as to prepare the high-performance carbon fiber. The method carries out pre-irradiation treatment before thermal stabilization, so that the thermal stabilization time can be shortened, the production efficiency can be improved, and polyacrylonitrile molecules can form a rigid structure with a regular structure and strong heat resistance. Higher rigid drafting can be applied in the thermal stabilization process, the orientation degree graphite-like sheets in the carbon fiber is facilitated, and the high-performance carbon fiber is prepared.

Description

technical field [0001] The invention belongs to the field of preparation of polyacrylonitrile carbon fibers, in particular to a method for preparing polyacrylonitrile carbon fibers by gamma ray irradiation. Background technique [0002] Polyacrylonitrile (PAN)-based carbon fiber has excellent properties such as high strength, high modulus, low density, and high temperature resistance. It has become the mainstream of carbon fiber development in the world today, accounting for more than 90% of the carbon fiber market. [0003] Before carbonization, the carbon fiber precursor should undergo thermal stabilization treatment, also known as pre-oxidation, to obtain a heat-resistant and stable structure with a trapezoidal structure that is infusible and non-combustible, thereby ensuring the smooth progress of the carbonization process and obtaining high-performance carbon fibers. However, although the molecular orientation degree of PAN precursors can reach more than 90% by means o...

Claims

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Application Information

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IPC IPC(8): D01F9/22D06M10/00
Inventor 吕永根赵卫哲周良霄蒋俊祺王菁
Owner DONGHUA UNIV
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