Device and method for carbon fiber precursor washing

Abstract

The invention discloses a device and method for carbon fiber precursor washing. The device comprises a rinsing machine silk guide roller group, a circulating water channel, a spraying water pump, a spraying nozzle and a rinsing water tank. The rinsing machine silk guide roller group is arranged above the circulating water channel, silk guide rollers are staggered up and down, an outlet is provided with an extrusion roll group, tows having undergone acid dipping enter the rinsing water tank through the rinsing machine silk guide roller group and the extrusion roll group, and the spraying nozzle is arranged above the rinsing machine silk guide roller group and connected with the spraying water pump. The method comprises a step 1) of conveying the desalted water to the rinsing water tank after the desalted water is heated; a step 2) of causing the desalted water in the rinsing water tank to enter the circulating water channel of a rinsing machine through overflow; a step 3) of causing the tows to undergo acid dipping and then enter the rinsing machine, spraying the sprayed water out of the spraying nozzle to form atomized water to wash the tows; a step 4) of washing the tows and then causing the tows to enter the rinsing water tank to be rinsed, and causing the advancing direction of the tows to be opposite to the flowing direction of the desalted water in the rinsing water tank. According to the device and method for carbon fiber precursor washing, sodium ions in the tows can be reduced, and quality of carbon fiber precursors is improved.

Description

technical field [0001] The invention relates to the field of carbon fiber production, and more particularly, relates to a carbon fiber precursor washing device and washing method. Background technique [0002] As a high-tech material, carbon fiber has the advantages of high strength, high modulus, low density, high temperature resistance, high electrical conductivity and thermal conductivity, and is widely used in aviation, automobile, cultural and sports fields. Polyacrylonitrile-based carbon fiber precursor is an important raw material for preparing carbon fiber, and the quality of the precursor plays a decisive role in the quality of carbon fiber. [0003] Sodium thiocyanate one-step method to prepare carbon fiber usually uses sodium thiocyanate as solvent, acrylonitrile, second monomer methyl acrylate, third monomer itaconic acid as raw materials, azobisisobutyronitrile as initiator Polymerization reaction, polyacrylonitrile polymerization solution is obtained after sin...

AI Technical Summary

Problems solved by technology

This washing method mainly has two defects. On the one hand, the length of the washing tank is too short, only 6 meters long, and the tow stays in the water bath for a short time. Because the residual sodium ions in the tow are proportional to the washing time, it cannot be fully washed. Tow

On the other hand, there is no weir partition in the long washing tank. When the washing water flows, it is easy to form dead zones on both sides of the washing tank, which cannot maintain a certain concentration difference and reduces the washing effect.

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