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Polyacrylonitrile carbon fiber and preparation method thereof

A polyacrylonitrile carbon fiber and polyacrylonitrile technology, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of complex process equipment, high cost, low efficiency, etc., and achieve simple production process, improve production efficiency, and control operation. handy effect

Inactive Publication Date: 2014-12-24
刘剑洪
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a polyacrylonitrile carbon fiber and its preparation method, aiming to solve the problems of complex process equipment, high energy consumption, high cost and low efficiency in the existing preparation method

Method used

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  • Polyacrylonitrile carbon fiber and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Batches of PAN precursors are first subjected to low-temperature heat treatment, and then successively undergo continuous pre-oxidation heat treatment, low-temperature carbonization heat treatment, and high-temperature carbonization heat treatment through a continuous pre-oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace.

[0044] The temperature of the low-temperature heat treatment is 120° C., and the heat treatment time is 60 days. The color of the fiber changes from white to light yellow, and some intramolecular cyclization reactions occur in the fiber. The fibers had no stretch applied and had a shrinkage of 1%.

[0045]The continuous pre-oxidation furnace is divided into 3 temperature zones, respectively 220, 250, and 270°C, the draft ratio is 3%, the tension is 15MPa, and the total residence time is 25min. The air is passed into the furnace to promote the cyclocrosslinking and oxidation reaction of the fiber,...

Embodiment 2

[0050] Batches of PAN precursors are first subjected to low-temperature heat treatment, and then successively undergo continuous pre-oxidation heat treatment, low-temperature carbonization heat treatment, and high-temperature carbonization heat treatment through a continuous pre-oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace.

[0051] The temperature of the low-temperature heat treatment is 120° C., and the heat treatment time is 60 days. The color of the fiber changes from white to light yellow, and some intramolecular cyclization reactions occur in the fiber. The fibers had no stretch applied and had a shrinkage of 1%.

[0052] The continuous pre-oxidation furnace is divided into 4 temperature zones, respectively 220, 240, 260, and 280°C, the draft ratio is 4.5%, the tension is 20MPa, and the total residence time is 35min. The air is passed into the furnace to promote the cyclocrosslinking and oxidation reaction of th...

Embodiment 3

[0057] Batches of PAN precursors are first subjected to low-temperature heat treatment, and then successively undergo continuous pre-oxidation heat treatment, low-temperature carbonization heat treatment, and high-temperature carbonization heat treatment through a continuous pre-oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace.

[0058] The temperature of the low-temperature heat treatment is 130° C., and the heat treatment time is 30 days. The color of the fiber changes from white to light yellow, and some intramolecular cyclization reactions occur in the fiber. The fibers had no stretch applied and had a shrinkage of 1.5%.

[0059] The continuous pre-oxidation furnace is divided into 3 temperature zones, respectively 220, 250, and 270°C, the draft ratio is 3%, the tension is 15MPa, and the total residence time is 25min. The air is passed into the furnace to promote the cyclocrosslinking and oxidation reaction of the fib...

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Abstract

The invention discloses polyacrylonitrile carbon fiber and a preparation method thereof. The preparation method comprises the following steps: feeding polyacrylonitrile raw silk into a heating furnace with the temperature of 120-150 DEG C, and performing low-temperature heat treatment for 10-60 days to obtain low-temperature heat treated silk; B, feeding the low-temperature heat treated silk into a continuous preoxidation furnace with the temperature of 220-280 DEG C, and performing continuous preoxidation heat treatment for 20-40 minutes to obtain preoxidized silk; C, feeding the preoxidized silk into a low-temperature carbonization furnace, and performing low-temperature carbonization heat treatment at 350-650 DEG C for 4-20 minutes to obtain preoxidized low-temperature carbonized silk; D, feeding the preoxidized low-temperature carbonized silk into a high-temperature carbonization furnace, and performing high-temperature carbonization heat treatment at 900-1,300 DEG C for 1-2 minutes to obtain the polyacrylonitrile carbon fiber. The preparation method is simple in process and convenient and safe to perform and control, and meets the requirements of batch production.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a polyacrylonitrile carbon fiber and a preparation method thereof. Background technique [0002] Carbon fibers are widely used in key areas of the national economy such as energy industry, civil construction, transportation, marine engineering, and sports and entertainment products. As new materials and strategic materials, high-performance fibers and composite materials have become one of the development priorities of strategic emerging industries during the "Twelfth Five-Year Plan" period. [0003] The polyacrylonitrile carbon fiber has to go through a series of heat treatments during the preparation process, among which the pre-oxidation process is one of the most important steps. After the pre-oxidation process, a stable heat-resistant structure can be obtained, thereby reducing the cracking of carbon in the carbonization stage, and Carbon fibers with high carbon yield and ...

Claims

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Application Information

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IPC IPC(8): D01F9/22
Inventor 刘剑洪张黔玲柴晓燕何传新徐坚
Owner 刘剑洪
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