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Preparation method of high-strength intermediate modulus carbon fiber precursor

A carbon fiber precursor, high-strength technology, applied in fiber processing, fiber chemical characteristics, wet spinning, etc., can solve problems such as difficult oxidation process, and achieve the effect of improving tensile strength and tensile modulus

Active Publication Date: 2019-09-13
WEIHAI TUOZHAN FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of curing by other processes, good solidification and drying and densification can well complete the closure of pores, which will help improve the tensile strength of carbon fibers in the later stage, but high densification will make the oxidation process difficult

Method used

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  • Preparation method of high-strength intermediate modulus carbon fiber precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation of raw silk mainly includes the following steps of polymerization, coagulation molding, water washing, hot water drawing, oiling and drying and densification, steam drawing, heat setting, and collection of raw silk to obtain finished raw silk.

[0018] Tension is applied to the coagulated filaments after leaving the coagulation bath and before being washed in water. The tension is 0.5 cN / dtex from the bath; during the process of leaving the bath, the ambient temperature is 23°C and the humidity is 60%. The water washing adopts flower roller slapping water washing, and the washing water flow direction is countercurrent. During the washing process, the washing temperature is controlled at 40°C, the washing tension is 2.5cN / dtex, and the number of washing tanks is 8. Use hot rollers for drying and densification. The drying and densification process is divided into two parts. The temperature of the first stage of drying and densification is 110 ℃, and the hum...

Embodiment 2

[0020] The preparation of raw silk mainly includes the following steps of polymerization, coagulation molding, water washing, hot water drawing, oiling and drying and densification, steam drawing, heat setting, and collection of raw silk to obtain finished raw silk.

[0021] Tension is applied to the coagulated filaments after leaving the coagulation bath and before being washed in water. The tension is 0.8 cN / dtex from the bath; during the process of leaving the bath, the ambient temperature is 23°C and the humidity is 60%.

[0022] The water washing adopts flower roller slapping water washing, and the washing water flow direction is countercurrent. During the washing process, the washing temperature is controlled at 40°C, the washing tension is 2.5cN / dtex, and the number of washing tanks is 8.

[0023] Use hot rollers for drying and densification. The drying and densification process is divided into two parts. The temperature of the first stage of drying and densification is ...

Embodiment 3

[0025] The preparation of raw silk mainly includes the following steps of polymerization, coagulation molding, water washing, hot water drawing, oiling and drying and densification, steam drawing, heat setting, and collection of raw silk to obtain finished raw silk.

[0026] Tension is applied to the coagulated filaments after leaving the coagulation bath and before being washed in water. The tension is 0.9 cN / dtex from the bath; during the process of leaving the bath, the ambient temperature is 23°C and the humidity is 60%.

[0027] The water washing adopts flower roller slapping water washing, and the washing water flow direction is countercurrent. During the washing process, the washing temperature is controlled at 40°C, the washing tension is 2.5cN / dtex, and the number of washing tanks is 8.

[0028] Use hot rollers for drying and densification. The drying and densification process is divided into two parts. The temperature of the first stage of drying and densification is ...

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Abstract

The invention relates to the field of carbon fiber production, in particular to a preparation method of a high-strength intermediate modulus carbon fiber precursor. The method comprises the followingsteps: polymerization, consolidation forming, rinsing, hot water drafting, finishing and drying densification, steam drafting, heat setting and precursor collection, so as to obtain a precursor finished product. A coagulated yarn strand is subjected to tension after going out a coagulating bath and before entering rinsing, and the tension is bath leaving tension, with the range being 0.5 to 1.0cN / dtex; the environment temperature is controlled to be 23 plus or minus 5 DEG C during bath leaving, and the humidity is controlled to be greater than or equal to 50 percent; the rinsing temperature iscontrolled to be 30 to 70 DEG C, the yarn bundle is controlled to be 1.0 to 3.5cN / dtex during rinsing, and the number of rinsing tanks is 6 to 11; the process of drying densification is divided intotwo parts, the first-stage drying densification temperature is 100 to 120 DEG C, in the first-stage drying densification, the drying densification humidity is controlled through a recirculating air system, and the humidity is smaller than or equal to 60 percent, and the second-stage drying densification temperature is 150 to 190 DEG C.

Description

technical field [0001] The invention relates to the field of carbon fiber production, in particular to a method for preparing high-strength medium-mold carbon fiber precursors. Background technique [0002] As we all know, the tensile strength and tensile modulus of the mechanical properties of carbon fiber basically determine its model, and thus these two indicators are always the goals pursued by the carbon fiber industry. In order to produce high-performance carbon fiber, it is necessary to cooperate with the original silk, which is also made on the basis of the original silk. Therefore, research on carbon fiber precursors is also essential. The coagulation and forming of carbon fiber precursors in the spinning process uses the principle of double diffusion. The process of coagulation and double diffusion has a good effect on promoting fiber densification. The process of pore closure plays a key role in improving the compactness of the protofilament. [0003] How to bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F11/14D01D5/06D01D5/00D01D10/06D01D10/02D01D5/14D01D11/00
CPCD01D5/00D01D5/06D01D5/14D01D10/02D01D10/06D01D11/00D01F9/22D01F11/14
Inventor 黄大明丛宗杰白江坡陈洞张大勇
Owner WEIHAI TUOZHAN FIBER