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Carbon fiber pre-oxidation equipment

A pre-oxidation, carbon fiber technology, applied in fiber chemical characteristics, textiles and papermaking, etc., can solve problems such as poor temperature uniformity and poor process adjustment flexibility

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the current domestic carbon fiber pre-oxidation furnace has poor temperature uniformity and process adjustment flexibility, and a carbon fiber pre-oxidation furnace is provided

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After the polyacrylonitrile precursor is uncoiled and tensioned, it enters the furnace through the guide roller at the left end of the ninth-layer stainless steel tube, and exits the pre-oxidation furnace from the right end of the ninth-layer stainless steel tube. Set wire speed v 0 2m / min, line speed v of tension station I 1 2m / min, line speed v of tension station II 2 The temperature inside the stainless steel tube is 260°C, and the temperature uniformity is ±0.3°C. The effective heating length is 4m, the pre-oxidation time is 2min, and the draft ratio is 0.

Embodiment 2

[0022] After the polyacrylonitrile precursor is uncoiled and tensioned, it enters the furnace through the guide roller at the left end of the ninth layer of stainless steel tube, and enters the eighth layer of stainless steel tube after being turned by the right guide roller of the ninth layer of stainless steel tube. Seven, six, five, four, three and two layers of stainless steel pipes will finally exit the pre-oxidation furnace on the right side of the first layer of stainless steel pipes, and set the line speed of the wire feeding machine v 0 0.2m / min, line speed v of tension station I 1 0.2m / min, line speed v of tension station II 2 The temperature is 0.2m / min. By adjusting the electric heating unit on the surface of the stainless steel tube, the hot air heating unit inside the stainless steel tube, and the hot air heating unit in the outer furnace of the stainless steel tube, the temperature inside the stainless steel tube is 260°C, and the temperature uniformity is ±0.2°...

Embodiment 3

[0024] After the polyacrylonitrile precursor is uncoiled and tensioned, it enters the furnace through the guide roller at the left end of the ninth-layer stainless steel tube, and exits the pre-oxidation furnace from the right end of the ninth-layer stainless steel tube. Set wire speed v 0 2m / min, line speed v of tension station I 1 2m / min, line speed v of tension station II 2 The temperature inside the stainless steel tube is 150°C, the temperature uniformity is ±0.5°C, and the fiber temperature is 2m / min. The effective heating length is 4m, the pre-oxidation time is 2min, and the draft ratio is 0.

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Abstract

The invention relates to a carbon fiber pre-oxidation furnace, and aims to solve the problems that the adjustment flexibility of pre-oxidation furnace is small and the temperature uniformity is bad in carbon fiber preparation. Stainless steel pipes (7) are parallelly arranged in the hearth (10); hot air is introduced into the hearth from an inlet (8), the external temperature of stainless steel pipes is controllable, the surface of the stainless steel pipes is heated by electric, and hot air is introduced into wire passing channels (15) in stainless steel pipes. Proto-filaments are uncoiled by a spreading machine (1), then are introduced into a hearth through a tension station (2), go through a tension station (4) after going out of the hearth, and finally go through a low carbon furnace and a high carbon furnace to obtain the carbon fiber. By changing the number of guiding rollers on the left end and right end of a pre-oxidation furnace, the total effective heating length of the fibers in stainless steel pipes can be adjusted in a large range. The provided technology can effectively improve the temperature uniformity of pre-oxidation furnace, the temperature, time, and traction can be adjusted rapidly, the technical problems mentioned above can be well solved, and the carbon fiber pre-oxidation equipment can be applied to carbon fiber industrial production.

Description

technical field [0001] The invention relates to a carbon fiber pre-oxidation equipment, which can effectively improve the temperature uniformity of the pre-oxidation furnace and quickly adjust the process parameters such as temperature, time and draft technical background [0002] Polyacrylonitrile-based carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and small thermal expansion coefficient, and is widely used in sports and leisure Supplies and high-tech industries, especially in the field of aerospace has great application prospects. The preparation of polyacrylonitrile-based carbon fibers generally includes three major processes: polymerization spinning, pre-oxidation, and carbonization. Among them, the production efficiency of pre-oxidation is one of the main factors controlling the cost of...

Claims

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Application Information

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IPC IPC(8): D01F9/32D01F9/22
Inventor 昌志龙张琨吴历斌吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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