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Method for preparing polyacrylonitrile carbon fibers

A polyacrylonitrile carbon fiber and fiber technology, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of large space for energy saving and consumption reduction, and achieve the effects of improving production efficiency, reducing production costs, high strength and orientation.

Inactive Publication Date: 2019-02-05
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, for carbon fiber production, there is still a lot of room for energy saving and consumption reduction

Method used

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  • Method for preparing polyacrylonitrile carbon fibers
  • Method for preparing polyacrylonitrile carbon fibers

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Embodiment

[0035] Select 1K (i.e. 1000 filaments / bundle) polyacrylonitrile precursor containing acrylamide copolymer (the content of acrylonitrile is not less than 92wt%) (denoted as: precursor A), first carry out 5 in the air atmosphere Segment infrared laser irradiation, the irradiation power density is 4.0kW / cm 2 、4.3kW / cm 2 、4.6kW / cm 2 、4.9kW / cm 2 、5.2kW / cm 2 , each section of residence time is 5min, a total of 25min, while controlling the tension as follows: the first and second section tension control is 30Mpa, the third section tension control is 24Mpa, the fourth and fifth section tension control is 30Mpa, to obtain polyacrylonitrile preoxidized fiber , and then the polyacrylonitrile pre-oxidized fiber is subjected to low-temperature carbonization at 400°C, 450°C, 600°C and 850°C under the protection of nitrogen, the residence time is 15min, and the tension is controlled at 12Mpa; finally, it enters the high-temperature carbonization furnace at 1300°C, The residence time is 2...

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Abstract

The invention discloses a method for preparing polyacrylonitrile carbon fibers. The method is realized through the following steps: (1) carrying out infrared laser irradiation on polyacrylonitrile fiber protofilaments to obtain pre-oxidized fibers; (2) carrying out low-temprature carbonization on the pre-oxidized fibers in a nitrogen gas atmosphere to obtain low-temprature carbonized fibers; (3) carrying out high-temprature carbonization on the low-temprature carbonized fibers to obtain the polyacrylonitrile carbon fibers. According to the method disclosed by the invention, the polyacrylonitrile fiber protofilaments are subjected to pre-oxidization treatment through the infrared laser irradiation and rapid heating can be realized; the thermal stabilization time is shortened and the pre-oxidized fibers with suitable cyclization degree, orientation density and body density can be obtained; the pre-oxidized fibers are subjected to low-temprature carbonization and high-temprature carbonization treatment, so that the obtained carbon fibers have relatively high strength and orientation degree. The polyacrylonitrile fiber protofilaments are treated by adopting the infrared laser irradiation, so that the production efficiency of the carbon fibers is remarkably improved and the production cost of the carbon fibers is further reduced; furthermore, the commoditization of the production ofthe carbon fibers is easy to realize and the high-performance carbon fibers are obtained.

Description

technical field [0001] The invention belongs to the field of carbon fiber production, in particular to a method for preparing polyacrylonitrile carbon fiber. Background technique [0002] Pre-oxidation is an important intermediate process in the production of PAN-based carbon fibers. It acts as a bridge connecting the past and the future from the original silk to carbon fiber. During this conversion process, the linear molecular chain of the PAN original silk is transformed into a pre-oxidized silk with a heat-resistant trapezoidal structure. In the high-temperature carbonization environment under the protection of inert gas, it does not melt or burn, maintains the shape of fibers, and then transforms into carbon fibers with a turbostratic graphite structure. The current pre-oxidation process adopts indirect heating with hot air circulation. The temperature of the pre-oxidation furnace is between 200-300 ° C. The furnace body is large, consumes a lot of energy, and the ener...

Claims

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Application Information

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IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 曹维宇沙扬杨卫民徐樑华谭晶
Owner BEIJING UNIV OF CHEM TECH
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