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Method for improving strength of polyacrylonitrile-based carbon fibers

A polyacrylonitrile-based carbon fiber, strength technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problem of no technical reports, and achieve the effect of reducing water absorption, simple control, and improving tensile elastic modulus

Active Publication Date: 2018-04-06
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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  • Method for improving strength of polyacrylonitrile-based carbon fibers
  • Method for improving strength of polyacrylonitrile-based carbon fibers
  • Method for improving strength of polyacrylonitrile-based carbon fibers

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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PUM

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Abstract

The invention discloses a method for improving strength of polyacrylonitrile-based carbon fibers. The method comprises the following steps: enabling polyacrylonitrile-based carbon fibers to immediately enter an environment with controlled temperature and humidity after tows are discharged out of an oxidizing furnace and a low-temperature carbonized furnace, so that a series of moisture absorptioneffects generated after the tows enters the humid environment are avoided; and enabling moisture absorbed after the tows enter the opening of the low-temperature carbonized furnace to be instantaneously gasified and bound to carbon atoms in the fibers, and releasing CO and other gases, so that defects or holes are reserved on the surfaces of the tows or inside the tows, and the strength and otherperformances of the fibers are reduced. According to the method disclosed by the invention, fluctuations brought to the strength and other performances of the carbon fibers due to changes of the temperature and humidity of the environment can be avoided, so that the prepared carbon fibers have excellent performances such as small quantity of holes, uniform quality, low discrete property, high strength and the like.

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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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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