New technolgy and device for poly acrylonitril fiber preoxidation and carbonation

Abstract

The invention provides a new process for preoxidation and carbonization of polyacrylonitrile fibers and a high-frequency negative pressure plasma heating device designed for the process. The device consists of a high-frequency power supply, parallel plate electrodes, a matching flat quartz glass reaction chamber, and an accessory device that enables the reaction chamber to form a negative pressure and an appropriate nitrogen-oxygen ratio atmosphere. It reacts under the action of a negative pressure environment and a high-frequency electric field. The plasma formed in the chamber greatly reduces the process temperature of pre-oxidation and carbonization, making the temperature of carbonization close to or even lower than the melting point of some organic substances in polyacrylonitrile, so that the two processes of pre-oxidation and carbonization can be combined in one heating device It is completed once, greatly reduces energy consumption, improves quality and reduces cost, and is a major improvement to the processing technology for preparing carbon fiber with polyacrylonitrile as raw material.

Description

Technical field [0001] The invention belongs to the improvement of the process and device for preparing polyacrylonitrile carbon fiber. Background technique [0002] Carbon fiber has a series of advantages such as low density, high strength, high temperature resistance, corrosion resistance, low resistance, high thermal conductivity, low expansion coefficient, and chemical radiation resistance. It also has the characteristics of fiber flexibility, woven characteristics and relatively low cost. Therefore, as a reinforcement of high-performance composite materials, it is widely used in composites with resins, ceramics, cement, and metals to become important composite materials in the fields of aviation, aerospace, military, sports, construction, and chemicals. A large number of currently used carbon fibers use polyacrylonitrile fibers as raw materials, and the polyacrylonitrile fibers are fed into the heating furnace under the drafting force through the transmissi...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to adopt a new structure heating furnace to overcome the defects of low thermal efficiency and slow adjustment speed of the electric furnace, realize the random adjustment of the temperature gradient of the furnace chamber and realize the one-time completion of the pre-oxidation carbonization process

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