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Polyacrylonitrile-based carbon fiber, preparation method and application thereof

A polyacrylonitrile-based carbon fiber and polyacrylonitrile fiber technology, which is applied in the chemical characteristics of fibers, chemical post-processing of synthetic polymer rayon filaments, textiles and papermaking, etc., can solve problems such as fiber burnout, improve mechanical properties, The effect of reducing the formation of skin-core structure and reducing the phenomenon of wire breakage

Active Publication Date: 2015-09-23
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 fiber, preparation method and application thereof
  • Polyacrylonitrile-based carbon fiber, preparation method and application thereof
  • Polyacrylonitrile-based carbon fiber, 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 Patents(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