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Polyacrylonitrile fiber pre-oxidation method, polyacrylonitrile carbon fiber and preparation method thereof

A technology of polyacrylonitrile carbon fiber and polyacrylonitrile fiber, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, etc. It can solve the problems of high energy consumption, long residence time, and slow running speed of polypropylene fiber in the pre-oxidation process, and realizes Effects of rapid pre-oxidation, improved performance stability, and shortened pre-oxidation time

Active Publication Date: 2019-07-26
山西钢科碳材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The homogeneity of the pre-oxidized fiber is poor, and the performance of the finally obtained polyacrylonitrile carbon fiber is unstable, and the dispersion coefficient is large
[0008] (2) The running speed of polypropylene fiber in the pre-oxidation process is slow (only 20m / h), and the pre-oxidation residence time is long (up to 70-120min), which makes the energy consumption and cost of the pre-oxidation process high and the cost is too high. Realize industrial production
[0009] (3) The existing technology needs to study the technical process of T300-T700, and there is no report on the preparation process of higher performance carbon fiber

Method used

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  • Polyacrylonitrile fiber pre-oxidation method, polyacrylonitrile carbon fiber and preparation method thereof
  • Polyacrylonitrile fiber pre-oxidation method, polyacrylonitrile carbon fiber and preparation method thereof
  • Polyacrylonitrile fiber pre-oxidation method, polyacrylonitrile carbon fiber and preparation method thereof

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preparation example Construction

[0065] On the other hand, the embodiment of the present invention also provides a method for preparing polyacrylonitrile carbon fiber, which is characterized in that it comprises the following steps:

[0066] Pre-oxidation: Pre-oxidize the polyacrylonitrile fiber in a pre-oxidation device to obtain a pre-oxidized fiber body; wherein, the above-mentioned pre-oxidation method for polyacrylonitrile fiber is used to perform a pre-oxidation reaction on the polyacrylonitrile fiber;

[0067] Low-temperature carbonization: performing low-temperature carbonization on the pre-oxidized fiber body to obtain a low-temperature carbonized fiber body;

[0068] High-temperature carbonization: Carry out high-temperature carbonization on the low-temperature carbonized fiber body to obtain polyacrylonitrile carbon fibers.

[0069] Preferably, the step of low-temperature carbonization is as follows: enter the pre-oxidized fiber body into a low-temperature carbonization furnace, and carry out low-t...

Embodiment 1

[0076] The raw silk of this embodiment selects monofilament diameter as 8 μ m, and density is 1.190g / cm 3 polyacrylonitrile fiber.

[0077] Pre-oxidation: make the polyacrylonitrile fibers enter the oxidation furnace, and carry out pre-oxidation under the oxygen atmosphere; wherein, the circulating air in the oxidation furnace is blown perpendicular to the running direction of the polyacrylonitrile fibers, and the wind speed is controlled at 0.6m / s, and the circulating air The water content is controlled at 10g m 3 / h. The initial temperature of pre-oxidation is 230°C, the end temperature is 280°C, and the temperature gradient is 13°C. During the pre-oxidation process, the pressure difference ΔP between the first position and the second position of the oxidation furnace is controlled at 15Pa; and the tension of the polyacrylonitrile fiber is controlled at 2000CN. The running speed of polyacrylonitrile fiber tow is 360m / h; the residence time of pre-oxidation is 30min. The p...

Embodiment 2

[0081] The raw silk of this embodiment selects monofilament diameter as 8 μ m, and density is 1.190g / cm 3 polyacrylonitrile fiber.

[0082] Pre-oxidation: make the polyacrylonitrile fibers enter the oxidation furnace, and carry out pre-oxidation under the oxygen atmosphere; wherein, the circulating air in the oxidation furnace is blown perpendicular to the running direction of the polyacrylonitrile fibers, and the wind speed is controlled at 0.6m / s, and the circulating air The water content is controlled at 12g m 3 / h. The initial temperature of pre-oxidation is 230°C, the end temperature is 280°C, and the temperature gradient is 13°C. During the pre-oxidation process, the direct pressure difference ΔP between the first position and the second position of the oxidation furnace is controlled at 15Pa; and the tension of the polyacrylonitrile fiber is controlled at 2000CN. The running speed of polyacrylonitrile fiber tow is 360m / h; the residence time of pre-oxidation is 30min....

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Abstract

The invention relates to a polyacrylonitrile fiber pre-oxidation method, a polyacrylonitrile carbon fiber and a preparation method thereof. According to the main technical scheme herein, the polyacrylonitrile fiber pre-oxidation method comprises the steps of pre-oxidizing a polyacrylonitrile fiber in an pre-oxidation apparatus to obtain pre-oxidized fibers, wherein a pressure difference between first and second positions in the pre-oxidation apparatus is 5-15 Pa during pre-oxidation, and wherein the first position is close to the inner top of the pre-oxidation apparatus, and the second position is close to the inner bottom of the pre-oxidation apparatus. The polyacrylonitrile fiber pre-oxidation method is applied mainly to: effectively improving homogeneity of the pre-oxidized fibers in order to prepare the polyacrylonitrile carbon fiber having low coefficient of dispersion; providing quick pre-oxidation, reduced energy consumption and reduced production cost in order to achieve industrial production of the polyacrylonitrile carbon fiber.

Description

technical field [0001] The invention relates to the technical field of carbon fibers, in particular to a preoxidation method of polyacrylonitrile fibers, polyacrylonitrile carbon fibers and a preparation method. Background technique [0002] Since the 1950s, carbon fiber has been continuously researched and developed by scientific researchers. At present, there are roughly three types of viscose fiber, pitch fiber and polyacrylonitrile carbon fiber. Due to the light weight, high strength and high modulus of polyacrylonitrile carbon fiber , and has a series of excellent properties such as electrical conductivity, thermal conductivity, corrosion resistance, and small thermal expansion coefficient. . [0003] In the field of polyacrylonitrile carbon fiber production, Japan represents the world's advanced level and leads the world trend. Its advantages in production scale, production cost and product quality are beyond the reach of other countries. In recent years, although gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 吕春祥常春报王飞刘纳新尹大宇李永红杨晗毛毅兴
Owner 山西钢科碳材料有限公司
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