Oxidation fiber manufacturing method and oxidation fiber

Abstract

The present disclosure mainly uses a transmitting unit to drive the fiber yarn bunch to pass an operation region of the microwave processing unit, and the microwave is focused to perform an ultra-fastpre-oxidization process on the passed fiber yarn bunch, thus processing the fiber yarn bunch to form an oxidation fiber yarn bunch. Not only an oxidization time of an oxidation fiber can be reduced,but also the cross section area of the oxidation layer of the oxidation fiber in the oxidation fiber yarn bunch generated by the microwave focusing oxidization process occupies more than 50 % of the cross section area of the oxidation fiber in the oxidation fiber yarn bunch. Thus, the shell-core structure of the oxidation fiber can be reduced efficiently. Even, the oxidation fiber has no obvious shell-core structure. Accordingly, relatively positive and reliable means for increasing the performance of carbon fiber are provided.

Description

technical field [0001] The present invention is related to the pre-oxidation technology of carbon fiber, and mainly discloses a method for manufacturing oxidized fiber which is helpful for improving the performance of carbon fiber, and the related oxidized fiber. Background technique [0002] Carbon fiber is a new type of carbon material with a carbon content of more than 90% converted from organic fibers after a series of heat treatments. It has high specific strength, high specific modulus, high electrical and thermal conductivity, low thermal expansion coefficient, low density, It has a series of excellent properties such as high temperature resistance, fatigue resistance, creep resistance and self-lubrication. It is an ideal functional material and structural material. It is widely used in aerospace, civil aviation and transportation and has broad application prospects. [0003] The preparation process of carbon fiber with polyacrylonitrile (PAN) as the precursor include...

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Problems solved by technology

[0004] The structural transformation of the precursor during the pre-oxidation process determines the structure and performance of the carbon fiber to a large extent. In industrial production, the pre-oxidation method of gradient temperature rise is often used. In this process, a suitable temperature gradient range is necessary. The initial If the temperature is too low, it will not contribute to the pre-oxidation process, and it will take time to increase the cost. However, if the initial temperature is too high, the violent reaction exotherm will fuse the PAN macromolecular chains without heat resistance; in addition, if the termination temperature is too high, Concentrated heat release will destroy the structure of pre-oxidized filaments and cause excessive pre-oxidation, which is not conducive to the preparation of high-strength carbon fibers, but the termination temperature is too low, and the original filaments may not be fully pre-oxidized

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