Coagulating bath solution of polyacrylonitrile-based protofilament, preparation method and application

A technology of polyacrylonitrile-based raw silk and coagulation bath, which is applied in rayon manufacturing, wet spinning, textiles and papermaking, etc. It can solve the problem that is not conducive to improving the uniformity of spinning speed and reducing the change of double diffusion speed , speed up the double diffusion process and other issues, to achieve the effect of reducing the double diffusion change rate, increasing the double diffusion speed, and high compactness

Inactive Publication Date: 2012-09-19
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods can realize the circular cross section of the primary fiber, but the double diffusion speed is slow and the speed changes quickly, and it is not conducive to improving the spinning speed and the uniformity of the inside and outside of the fiber, that is, it is impossible to speed up the double diffusion process while reducing the double diffusion speed. degree of change

Method used

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  • Coagulating bath solution of polyacrylonitrile-based protofilament, preparation method and application
  • Coagulating bath solution of polyacrylonitrile-based protofilament, preparation method and application
  • Coagulating bath solution of polyacrylonitrile-based protofilament, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Mix dimethyl sulfoxide and water at a volume ratio of dimethyl sulfoxide: water of 120:100, and mix evenly at 45°C to prepare an aqueous solution of dimethyl sulfoxide.

[0026] (2) Add ethylene glycol to the dimethyl sulfoxide aqueous solution, mix well at 45°C, make the ethylene glycol content in the dimethyl sulfoxide aqueous solution 0.02mol / L, and obtain the coagulation bath solution.

[0027] (3) The spinning solution enters the coagulation bath solution through the spinneret to form primary fibers, and the residence time of the fibers in the coagulation bath is 4 seconds.

[0028] The prepared nascent fibers were analyzed with a scanning electron microscope, and the electron microscope pictures ( figure 1 ) The cross-sectional morphology of the primary fibers on the surface is relatively round. The fiber body density is measured by the specific gravity method, and the fiber body density is 1.190g / cm 3 .

Embodiment 2

[0030] 1. Mix dimethyl sulfoxide and water at a volume ratio of dimethyl sulfoxide: water of 160:100, and mix evenly at 50°C to prepare an aqueous solution of dimethyl sulfoxide.

[0031] 2. Add acetone to the dimethyl sulfoxide aqueous solution, and mix evenly at 50° C. so that the acetone content in the dimethyl sulfoxide aqueous solution is 0.04 mol / L to obtain a coagulation bath solution.

[0032] 3. The spinning solution enters the coagulation bath through the spinneret to form primary fibers, and the residence time of the fibers in the coagulation bath is 3.2 seconds.

[0033] The prepared nascent fibers were analyzed with a scanning electron microscope, and the electron microscope pictures ( figure 2 ) The cross-sectional morphology of the primary fibers on the surface is relatively round. The fiber body density is measured by the specific gravity method, and the fiber body density is 1.192g / cm 3 .

Embodiment 3

[0035] (1) Mix dimethyl sulfoxide and water at a volume ratio of dimethyl sulfoxide: water of 200:100, and mix evenly at 60°C to prepare an aqueous solution of dimethyl sulfoxide.

[0036] (2) Add ammonium carbonate to the dimethyl sulfoxide aqueous solution, mix well at 55°C, make the ammonium carbonate content in the dimethyl sulfoxide aqueous solution 0.04mol / L, and obtain a coagulation bath solution.

[0037] (3) The spinning solution enters the coagulation bath through the spinneret to form primary fibers, and the residence time of the fibers in the coagulation bath is 5 seconds.

[0038] The prepared nascent fibers were analyzed with a scanning electron microscope, and the electron microscope pictures ( image 3 ) The cross-sectional morphology of the primary fibers on the surface is relatively round. The fiber body density is measured by the specific gravity method, and the fiber body density is 1.192g / cm 3 .

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Abstract

The invention discloses coagulating bath solution of polyacrylonitrile-based protofilament, comprising the following components: dimethyl sulfoxide, water and a third component, wherein the volume ratio of the dimethyl sulfoxide and the water is (120-230):100; and the content of the third component in the dimethyl sulfoxide solution is 0.02mol / L-0.08mol / L. A preparation method comprises the following steps of: mixing the dimethyl sulfoxide and the water according to the volume ratio being (120-230):100, and mixing uniformly at the temperature of 45-60 DEG C so as to obtain the dimethyl sulfoxide solution; adding the third component in the dimethyl sulfoxide solution with the content in the dimethyl sulfoxide solution being 0.02mol / L-0.08mol / L, and mixing uniformly to obtain the coagulating bath solution of the polyacrylonitrile-based protofilament. The invention has the advantages that the performance of the polyacrylonitrile-based protofilament can be improved and the spinning speed can be accelerated.

Description

technical field [0001] The invention belongs to a coagulation bath solution, its preparation method and application, in particular to a coagulation bath solution capable of improving the performance of polyacrylonitrile-based precursors, its preparation method and application. Background technique [0002] High-quality precursors are the basis for producing high-performance polyacrylonitrile-based carbon fibers. Factors affecting the properties of the precursor include the properties of the polymer and the spinning process of the precursor. The spinning process of raw silk includes coagulation, washing, drawing, oiling, relaxation heat setting and drying and densification. Among them, coagulation is a key step that affects the structure and properties of the precursor. Coagulation refers to the process that the spinning solution enters the coagulation bath after being extruded from the spinneret, and is coagulated into fibers through double diffusion, that is, the solvent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/18D01F1/00D01D5/06
Inventor 吕春祥蔡文有李东升杨章玄张君翔张寿春赵振波毛毅兴李燕生李文君郝俊杰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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