Microwave heating preparation device for pre-oxidized fiber

Abstract

The invention relates to a microwave heating preparation device for a pre-oxidized fiber and belongs to the technical field of microwave heating. The microwave heating preparation device comprises a microwave oven, a carrier tube and a wave-absorbing coating, wherein the transversely placed carrier tube is arranged in the microwave oven; the inner surface of the carrier tube is coated with the wave-absorbing coating; the carrier tube is made of a mullite or corundum non-wave-absorbing material; and the wave absorption coating is made of a ferrite or silicon carbide wave-absorbing material. Themicrowave heating preparation device is novel in method and clear in structure. As the non-wave-absorbing material has very strong microwave permeability, energy released by microwaves is more uniform; the wave-absorbing coating can dilute microwaves, so that the material can absorb waves more stably; the carrier tube is coated with asbestos, so that energy released by the microwaves can be stored; through the above treatment, a 'skin core' structure of the pre-oxidized fiber is eliminated, the pre-oxidized fiber is more uniform in the radial direction, the bulk density is improved, and a foundation is laid for acquiring a high-performance carbon fiber.

Description

technical field [0001] The invention relates to a device for preparing pre-oxygen wire by microwave heating, belonging to the technical field of microwave heating technology. Background technique [0002] The pre-oxidation process of the raw silk is carried out between 180 and 280 ℃, and it is mainly realized by traditional heating methods such as muffle furnace. The traditional heating method is to heat from the surface to the inside through radiation, convection and conduction. The pre-oxidation process is a double diffusion process. Oxygen diffuses from the surface to the inside of the fiber, and the internal non-carbon small molecule gas products diffuse outward. With the progress of the pre-oxidation reaction, the molecular chain of the fiber surface first forms a dense trapezoidal structure, which hinders the diffusion of oxygen to the core, and makes the fiber form a cyclized core with a low degree of cross-linking. The pre-oxidation reaction proceeds gradually from...

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Problems solved by technology

[0004] Due to the low dielectric constant of the precursor and the thin fiber diameter, it is difficult to efficiently absorb microwaves, so the utilization rate of microwave energy is too low, and the radial structure of the fibers is difficult to effectively control

The current microwave heating equipment used for pre-oxidation of raw silk has the following disadvantages: 1. The energy consumption is large and cannot be reused; 2. The energy cannot be diluted and dispersed, resulting in uneven heating of the material; 3. The equipment is closed and the material cannot be continuously transmitted. heating

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