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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
  • Application Information

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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 chain molecules, it will cause disorientation due to thermal shrinkage of molecular chains during the thermal stabilization process. Affect the mechanical properties of the final carbon fiber

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

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Embodiment 1

[0022] Select 3K (that is, 3000 single filaments / bundle) polyacrylonitrile precursors containing acrylamide copolymers (denoted as: precursor A), first carry out in the air atmosphere 60 Coγ-ray irradiation, irradiation dose rate 1kGy / h, irradiation time 50h, the total irradiation dose is 50kGy, to obtain radiation modified "cold cross-linked" polyacrylonitrile fiber. Then, the irradiated polyacrylonitrile fibers were subjected to thermal stabilization treatment in five temperature ranges of 200°C, 220°C, 235°C, 250°C and 280°C in air medium, and the residence time in each temperature zone was 15min. A total of 75 minutes. The tension control is as follows: the tension control in the first and second temperature zones is 30MPa, the tension control in the third temperature zone is 24MPa, and the tension control in the third temperature zone is 30MPa. That is, heat-stabilized fibers are obtained. Under the protection of nitrogen, the thermally stabilized fiber is subjected to ...

Embodiment 2

[0026] Fiber sample is the same as embodiment 1, at first carries out in air atmosphere 60 Co gamma ray irradiation, the irradiation dose rate is 1kGy / h, the irradiation time is 100h, and the total irradiation dose is 100kGy to obtain radiation-modified "cold cross-linked" polyacrylonitrile fibers. Then, the irradiated polyacrylonitrile fibers were subjected to heat stabilization treatment in five temperature ranges of 200°C, 220°C, 235°C, 250°C and 280°C in air medium, and the residence time in each temperature zone was 12.5min. , a total of 60 minutes. The tension control is as follows: the tension control in the first and second temperature zones is 35MPa, the tension control in the third temperature zone is 26MPa, and the tension control in the third temperature zone is 35MPa. That is, heat-stabilized fibers are obtained. Under the protection of nitrogen, the thermally stabilized fiber was carbonized at 400°C, 450°C, 600°C and 850°C at a temperature of 12.5 minutes, and ...

Embodiment 3

[0028] Fiber sample is the same as embodiment 1, at first carries out in air atmosphere 60 Coγ-ray irradiation, the irradiation dose rate is 2kGy / h, the irradiation time is 100h, and the total irradiation dose is 200kGy to obtain radiation-modified "cold cross-linked" polyacrylonitrile fibers. Then, the radiation-modified polyacrylonitrile fibers were subjected to thermal stabilization treatment in five temperature ranges of 200°C, 220°C, 235°C, 250°C and 280°C in air medium, and the residence time in each temperature zone was 11min. A total of 55 minutes. The tension control is as follows: the tension control in the first and second temperature zones is 37.5MPa, the tension control in the third temperature zone is 28MPa, and the tension control in the third temperature zone is 37.5MPa. That is, heat-stabilized fibers are obtained. Under the protection of nitrogen, the thermally stabilized fiber was carbonized at a low temperature of 400°C, 450°C, 600°C and 850°C. The reside...

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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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