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A method suitable for solidification and molding of polyacrylonitrile carbon fiber precursors in dry and wet processes

A polyacrylonitrile carbon fiber, coagulation molding technology, applied in the chemical characteristics of fibers, chemical post-processing of rayon, textiles and papermaking, etc. The effect of suitability

Active Publication Date: 2016-09-07
ZHONGFU SHENYING CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This forming method will form very serious structural defects, which will be inherited during the operation of the tow, thus greatly reducing the overall performance of the original silk and even carbon filaments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, a kind of method that is suitable for dry-wet process polyacrylonitrile carbon fiber precursor coagulation molding, its preparation steps are as follows:

[0020] The coagulation bath uses dimethyl sulfoxide as the coagulation bath solute, water as the solvent, the mass concentration is 25%, and the coagulation bath temperature is 0°C. Spin the spinning stock solution with a pH of 9.5 after ammoniation treatment, a solid content of the stock solution of 23%, and a temperature of 15°C through a spinneret with 12,000 holes and a hole diameter of 0.12mm at a spinning speed of 20m / min. , enter the coagulation bath after passing through a 10cm air layer, the pre-drawing is controlled at 3.0 times, the residence time of the stock solution in the coagulation bath is 3s, the surface of the stock solution is rapidly quenched to form a dura mater, and the double diffusion rate is slowed down by virtue of the dura mater and low temperature, low concentration and other...

Embodiment 2

[0021] Embodiment 2, a kind of method that is applicable to dry-wet method polyacrylonitrile carbon fiber precursor coagulation molding, its preparation steps are as follows:

[0022] The coagulation bath uses dimethylformamide as the coagulation bath solute, acetone as the solvent, the mass concentration is 30%, and the coagulation bath temperature is 2°C. Spin out the spinning stock solution with a pH of 9.0 after ammoniation treatment, a solid content of the stock solution of 20%, and a temperature of 20°C through a spinneret with 6,000 holes and a hole diameter of 0.15mm at a spinning speed of 25m / min. , enter the coagulation bath after passing through the 12cm air layer, the pre-drawing is controlled at 3.3 times, the residence time of the stock solution in the coagulation bath is 4s, the surface of the stock solution is quickly quenched to form a dura mater, and the double diffusion rate is slowed down by virtue of the dura mater and low temperature, low concentration and...

Embodiment 3

[0023] Embodiment 3, a kind of method that is applicable to dry-wet process polyacrylonitrile carbon fiber precursor coagulation molding, its preparation steps are as follows:

[0024] The coagulation bath uses dimethyl sulfoxide as the coagulation bath solute, water as the solvent, the mass concentration is 30%, and the coagulation bath temperature is 5°C. Spin out the spinning stock solution with a pH of 9.2 after ammoniation treatment, a solid content of the stock solution of 20%, and a temperature of 20°C through a spinneret with 6,000 holes and a hole diameter of 0.2mm at a spinning speed of 35m / min. , enter the coagulation bath after passing through the 12cm air layer, the pre-drawing is controlled at 3.3 times, the original solution stays in the coagulation bath for 5s, the surface of the original solution is rapidly quenched to form a dura mater, and the double diffusion rate is slowed down by virtue of the dura mater and low temperature, low concentration and other con...

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Abstract

The invention is a method suitable for coagulation and molding of polyacrylonitrile carbon fiber precursors by dry and wet methods. The preparation steps are as follows: in a low-temperature and low-concentration coagulation bath with a coagulation temperature of -20-25°C and a mass concentration of 5-40%. , so that the spinning stock solution is sprayed into the coagulation bath through the spinneret through the air layer, and the residence time in the coagulation bath is 2-10s. , and improve the orientation degree of the nascent fiber through the hard film, realize the homogenization of coagulation molding, avoid the skin-core structure, that is, obtain the nascent fiber with a pre-drawing ratio of 2.3-4.0 times, and its orientation degree reaches 65-70% . The raw silk prepared by the method of the present invention has high homogeneity, can obtain high-quality raw silk and carbon filament, and has strong applicability in dry-wet method technology, and can be produced in dry-wet method for promotional use.

Description

technical field [0001] The invention relates to the technical field of preparation of polyacrylonitrile carbon fiber precursors, in particular to a method suitable for low-temperature, low-concentration and homogeneous coagulation molding of polyacrylonitrile carbon fiber precursors in a dry-wet process. Background technique [0002] Polyacrylonitrile-based carbon fiber is the most promising precursor for the production of high-performance carbon fiber. Using polyacrylonitrile precursor as the starting material, the carbon fiber obtained through pre-oxidation and carbonization processes has the best comprehensive performance. In the preparation process of polyacrylonitrile precursors, coagulation molding is the key link of production, so the molding quality of primary fibers directly affects the comprehensive performance of precursors and carbon filaments. In wet spinning, coagulation forming mainly relies on double diffusion as the forming power, so that the spinning fine f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22D01F11/12
Inventor 张国良李怀京刘芳金亮陈秋飞
Owner ZHONGFU SHENYING CARBON FIBER
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