Microwave thermal reaction device for carbonizing pre-oxidized fiber, and processing technique

Abstract

The invention relates to a heating equipment for preliminary heat treatment in oxidizing and carbonizing fibre and its working process. The described heating equipment is a mcirowave thermal reaction equipment formed from microwave generator, power matching device, coiled waveguide tube with radial through-hole, water load and quartz tube thermal reactor placed in the through-hole. Said invention adopts microwave method, and utilizes quartz tube thermal reactor into which the high-pure nitrogen gas can be charged so as to ensure carbonization process condition.

Description

technical field [0001] The invention aims at the improvement of the heating device and the processing technology when the carbon fiber is prepared from the pre-oxidized fiber. Background technique [0002] Carbon fiber is a high-quality, high-performance, low-cost composite raw material discovered so far, and it plays an important role in high-tech fields such as aviation, aerospace, military, sports, construction, and chemical engineering. At present, the preparation of carbon fiber is to heat the polypropylene nitrile fiber at 400°C in a closed manner, pyrolyze and oxidize the fusible components in the fiber, so that the linear polymer can be cross-linked, cyclized, oxidized, and deoxidized. A trapezoidal polymer structure with better stability is formed, which is called pre-oxidized fiber. [0003] Under the effect of drawing tension, the pre-oxidized fiber is sent into the heating furnace again, and the temperature is raised to 1000°C-1500°C under nitrogen atmosphere fo...

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Problems solved by technology

[0003] Under the effect of drawing tension, the pre-oxidized fiber is sent into the heating furnace again, and the temperature is raised to 1000°C-1500°C under nitrogen atmosphere for 5-20 minutes. After the pre-oxidized fiber completes the carbonization process, this process is the same as the above-mentioned pre-oxidized The processing looks similar but is different in nature, and the process conditions are quite different. The electric furnace heating method adopted in the traditional process needs to be matched with a high-purity nitrogen environment, and it is necessary to ensure that the multi-filament beam obtains a uniform heating process in the electric furnace. It is very difficult to process, resulting in huge and complex equipment, difficult temperature adjustment, low thermal efficiency, high cost, and large energy consumption

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