A Restoration Method for Broken End in Continuous Spinning Process of Mesophase Pitch

Abstract

The invention discloses a method for recovering broken ends in the continuous spinning process of mesophase pitch. The realization of the recovery method mainly focuses on the oiling and bundling process. The devices used in this process include oiling rollers, oil tanks and cluster wheels, and the devices used in the recovery of severed ends are mainly frequency conversion fans and the exhaust pipes connected to them. The as-spun pitch fiber continuously extruded through the spinneret is firstly oiled continuously and evenly by the rotating oiling roller, then bundled by the bundle wheel, and then wound by the winder after the bundle is bundled. The end is sucked into the pipeline connected with the frequency conversion fan, and the diameter of the broken end is finely controlled by adjusting the negative pressure to ensure that the diameter of the broken end is consistent with the diameter of the mainstream fiber, and then it is moved to the In the mainstream tow, the restoration of the broken end in the spinning process has been completed. The decapitated recovery method adopted in the present invention is simple to operate, and is very easy to be popularized and used in industrialized production.

Description

technical field [0001] The invention belongs to the technical field of continuous filament preparation of high-performance mesophase pitch-based carbon fibers, and in particular relates to a method for recovering broken ends in the process of continuous spinning of mesophase pitch, which is used to reduce dispersion and further improve the quality of pitch fibers. Background technique [0002] High-performance mesophase pitch-based carbon fibers have high thermal conductivity and high modulus, and are especially suitable for space environments with large temperature differences between day and night. Using it as a reinforcement can prepare various structural and functional composite materials with zero thermal expansion coefficients. It has become an indispensable key reinforcement to solve outer space structure and functional composite materials. [0003] In the preparation process of continuous filaments of high-performance mesophase pitch-based carbon fibers, the melt spi...

AI Technical Summary

Problems solved by technology

[0004] Compared with other chemical fiber spinning, the spinning of mesophase pitch is more difficult, which is mainly reflected in the first comprehensive performance of spinning pitch raw materials (including mesophase content, softening point, thermal stability, fluidity, etc.) Higher requirements for denaturation performance, ash content, etc.); secondly, the spinning temperature is higher (usually above 320°C), and the requirements for the properties of the heat medium are more stringent; thirdly, the asphalt fiber as initially spun is very fragile and will break when touched by hand Unable to withstand excessive drafting and tossing, many factors make it difficult to achieve continuous spinning for several hours in pitch spinning

At present, the treatment of broken filaments is usually to close the broken filaments directly into the mainstream fibers by hand, and the broken filaments are directly closed into the mainstream fibers without drafting, which will lead to thicker filament diameters, larger dispersion, and reduced consistency and stability. , the quality cannot be guaranteed

Based on this, it is particularly urgent to develop a recovery method for the broken end of pitch fiber continuous spinning process, which is of great significance for further improving the apparent stability of spinning, and then improving the quality of pitch fiber. Patents or literature reports on this aspect are relatively rare

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