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A method for improving the strength of polyacrylonitrile-based carbon fiber

A polyacrylonitrile-based carbon fiber, strength technology, applied in the direction of chemical characteristics of fibers, textiles and papermaking, etc., can solve the problem of no technical report, and achieve the effect of obvious invention effect, stable performance and high mechanical performance.

Active Publication Date: 2022-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the voids and defects on the surface and interior of the fiber caused by the moisture brought by the ambient temperature and humidity during the carbonization process, most of them have not yet paid attention to this problem, and there are no technical reports.

Method used

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  • A method for improving the strength of polyacrylonitrile-based carbon fiber
  • A method for improving the strength of polyacrylonitrile-based carbon fiber
  • A method for improving the strength of polyacrylonitrile-based carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0031] Carry out the preparation of carbon fiber according to the following steps:

[0032] 1) After warping, the polyacrylonitrile raw silk enters the 1# oxidation furnace with a temperature of 225 and 232°C at 5.5m / min and a certain tension in sequence (225 and 232°C are the control temperatures of the two temperature zones of the 1# furnace respectively, The same below), then enter the 2# oxidation furnace that the temperature is 238,245°C, and finally enter the 3# oxidation furnace that the temperature is 253,263°C, the residence time in the furnace is 95min; wherein the oxidation furnace end zone temperature of each embodiment See Table 2.

[0033] 2) The pre-oxidized wire coming out of the 3# oxidation furnace is pulled by the exit pulling roller into the first constant temperature and humidity chamber. Compressed air with a pressure of 0.6 MPa and a dew point of -40°C is introduced into the room, and the pressure in the constant temperature and humidity room is control...

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Abstract

The invention discloses a method for improving the strength of polyacrylonitrile-based carbon fibers. In this method, the polyacrylonitrile-based carbon fiber enters an environment with controlled temperature and humidity immediately after the tow exits the oxidation furnace and the low-temperature carbonization furnace, so as to avoid a series of moisture absorption effects after the tow enters a humid environment, so that the tow enters The moisture absorbed after the high-temperature carbonization furnace mouth is instantly gasified and combined with the carbon atoms in the fiber, releasing CO and other gases, thereby leaving defects or holes on the surface or inside of the tow, reducing the strength and other properties of the fiber. The method of the invention can avoid fluctuations in properties such as carbon fiber strength due to changes in ambient temperature and humidity, so that the prepared carbon fibers have fewer holes, uniform quality, small dispersion, and excellent properties such as strength.

Description

technical field [0001] The invention relates to the technical field of carbon fibers, in particular to a method for improving the strength of polyacrylonitrile-based carbon fibers. Background technique [0002] Carbon fiber is a new type of high-strength, high-modulus fiber material with a carbon content of more than 95%. Between non-metal and metal, it has small coefficient of thermal expansion and anisotropy, good corrosion resistance, good X-ray permeability, good electrical and thermal conductivity, electromagnetic shielding, etc. It is important in national defense and civilian applications Material. It not only has the inherent intrinsic characteristics of carbon materials, but also has the softness and processability of textile fibers. It is a new generation of reinforcing fibers. [0003] Structurally speaking, carbon fiber is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the fiber axis and under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 顾文兰宋文迪吴嵩义
Owner CHINA PETROLEUM & CHEM CORP
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