Preparation of a dual-channel hot-state switching hybrid filter for mesophase pitch-based carbon fibers

Abstract

The invention discloses a dual-channel hot-state switching mixing filter for preparing mesophase pitch-based carbon fibers, so that the molten polymer before reaching the component has been repeatedly mixed in multiple mixing flow channels inside the filter, and impurities and gels are in the filter screen and The metal sand is filtered multiple times to ensure that the molten polymer is evenly mixed when it reaches the inlet of the spinning assembly. It adopts a symmetrical arrangement structure and has two identical filter flow channels. Four high-temperature electromagnetic ball valves control the closed state of the flow channel. When there are too many impurities in one filter channel and blockage occurs, the molten polymer flow channel is switched to another filter channel through valve control, so that production can continue without filter blockage influences.

Description

technical field [0001] The invention belongs to the field of preparation of mesophase pitch-based carbon fibers, and in particular relates to a dual-channel thermal state switching mixing filter for preparing mesophase pitch-based carbon fibers. Background technique [0002] Pitch-based carbon fiber is a special fiber with a carbon content greater than 92% that is produced from petroleum pitch or coal pitch through refining, spinning, pre-oxidation, carbonization or graphitization of pitch. It is a new material with excellent mechanical properties. Its specific gravity is less than 1 / 4 of that of steel. The tensile strength of carbon fiber resin composite materials is generally above 3500Mpa, which is 7 to 9 times that of steel, and the tensile modulus of elasticity is 230~ 430Gpa is also higher than steel. It has excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical cond...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a dual-channel hot-state switching hybrid filter for preparing mesophase pitch-based carbon fibers, so as to overcome the defects of the existing mesophase pitch-based carbon fiber spinning technology. The structure of the present invention is reasonable and simple, easy to process and form, and The assembly is compact and the required functions are complete, which makes the physical and chemical properties of the molten polymer uniform before entering the spinning assembly, improves the performance of carbon fibers, and at the same time prolongs the working time of the spinning assembly during carbon fiber spinning, increasing the single spinning capacity , and can also be replaced under working conditions, realizing uninterrupted spinning and improving work efficiency

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