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Polyacrylonitrile-based carbon fibers as well as preparation method and application thereof

A technology of polyacrylonitrile-based carbon fiber and polyacrylonitrile fiber, which is applied in the fields of fiber chemical characteristics, synthetic polymer artificial filament chemical post-treatment, textiles and papermaking, etc. It can solve the problems of fiber burning and other problems, and achieve the improvement of mechanical properties, The effect of reducing broken wires and reducing the formation of skin-core structure

Active Publication Date: 2014-02-12
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the preparation of polyacrylonitrile-based carbon fibers, the pre-oxidation reaction is concentrated in heat release, which can easily cause the fibers to overheat and burn out.

Method used

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  • Polyacrylonitrile-based carbon fibers as well as preparation method and application thereof
  • Polyacrylonitrile-based carbon fibers as well as preparation method and application thereof
  • Polyacrylonitrile-based carbon fibers as well as preparation method and application thereof

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preparation example Construction

[0082] The invention provides a kind of preparation method of polyacrylonitrile base carbon fiber, comprises the following steps:

[0083] Prepare humidification solution: dissolve oxygen-enriched substance, siloxane, and borate in water to prepare humidification solution;

[0084] Precursor humidification: immerse the polyacrylonitrile precursor in the soaking device equipped with a humidifying solution, the content of the humidifying solution attached to the precursor is 1~30wt% of the polyacrylonitrile precursor, and obtain the polyacrylonitrile fiber after humidification;

[0085] Heat treatment: heat-treat the humidified polyacrylonitrile fiber in an oxidation furnace, the oxygen content in the oxidation furnace is 1~30v%, and the temperature is 100~305℃;

[0086] Carbonization: Carbonize the heat-treated polyacrylonitrile fibers to prepare polyacrylonitrile-based carbon fibers.

[0087] Wherein, the resistivity of water in the step of preparing the humidifying solution ...

Embodiment 1

[0135] Based on the total amount of humidifying solution, the content of octamethylcyclotetrasiloxane is 0.1wt%, the content of trimethyl borate is 0.1wt%, and the content of potassium permanganate is 25wt%;

[0136] The wetting solution is evenly attached to the surface of the raw silk by the wetting device, so that the content of the humidifying solution is 30wt% of the raw silk.

[0137] The humidified fiber is heat treated in the oxidation furnace, the heat treatment is in the range of 100-250 °C for 53 minutes, the oxygen content is 23v%, and the draft ratio is 5%; the heat treatment is in the range of 235-305 °C for 53 minutes, and the heat medium gas is filled with nitrogen. The oxygen content is 19v%, and the draft ratio is 0%.

[0138] Carbonize at a low temperature of 290-910°C for 2 minutes, and the draw ratio is 2%; carbonize at a high temperature at 850-1550°C for 2 minutes, and the draw ratio is -1%, to obtain polyacrylonitrile-based carbon fibers.

[0139] The ...

Embodiment 2

[0141] Based on the total amount of the humidifying solution, the content of decamethylcyclopentasiloxane is 0.5wt%, the content of tris(trimethylsilane) borate is 0.5wt%, and the content of sodium percarbonate is 17wt%.

[0142] The wetting solution is evenly attached to the surface of the raw silk by the wetting device, so that the content of the humidifying solution is 20wt% of the raw silk.

[0143] Heat the humidified fibers in an oxidation furnace for 40 minutes at 100-250°C, with an oxygen content of 21v% and a draw ratio of 8%; heat-treat at 235-305°C for 43 minutes, and fill in nitrogen to make the heat medium gas The oxygen content is 17v%, and the draft ratio is -1%.

[0144] Carbonize at a low temperature of 290-910°C for 10 minutes, and the draw ratio is 0%; carbonize at a high temperature at 850-1550°C for 13 minutes, and the draw ratio is -2%, to obtain polyacrylonitrile-based carbon fibers.

[0145] The measured tensile strength of the polyacrylonitrile-based ...

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Abstract

The invention discloses polyacrylonitrile-based carbon fibers as well as a preparation method and an application thereof. The preparation method comprises the following steps: dissolving an oxygen-rich matter, siloxane and boric acid ester in water so as to prepare a humidifying solution; immersing polyacrylonitrile precursor fibers in an immersion device filled with the humidifying solution so as to obtain humidified polyacrylonitrile fibers; carrying out thermal treatment on the humidified polyacrylonitrile fibers in an oxidizing furnace; carbonizing the polyacrylonitrile fibers subjected to the thermal treatment so as to obtain the polyacrylonitrile-based carbon fibers. The invention also provides the polyacrylonitrile-based carbon fibers prepared from the method and the application of the polyacrylonitrile-based carbon fibers. The preparation method has the advantages that the yarn breakage phenomenon and the formation of a skin-core structure are reduced, and the mechanical property of the polyacrylonitrile-based carbon fibers is improved.

Description

technical field [0001] The invention relates to a carbon fiber, in particular to a polyacrylonitrile-based carbon fiber, a preparation method and an application thereof. Background technique [0002] Polyacrylonitrile-based carbon fibers tend to produce a skin-core structure during the preparation process. The skin-core structure is caused by the distribution of oxygen content inside the fiber and the inhomogeneity of heating during the pre-oxidation process. The surface structure and core structure of the pre-oxidized fiber inhomogeneity. The generation of this skin-core structure reduces the mechanical properties of carbon fibers. During the preparation of polyacrylonitrile-based carbon fibers, the exothermic heat of the pre-oxidation reaction is concentrated, which can easily cause the fibers to overheat and burn out. Contents of the invention [0003] In summary, it is necessary for the present invention to provide a method for preparing polyacrylonitrile-based carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F11/06
Inventor 谢怀玉宋威黄有平雷震易明周永新陈涛袁建华蔡彤旻黄险波
Owner KINGFA SCI & TECH CO LTD
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