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A new drawing method in the preparation process of polyacrylonitrile-based carbon fiber precursor

A polyacrylonitrile-based carbon fiber, a preparation process technology, applied in the direction of stretch spinning, filament generation, artificial filament cleaning/drying, etc., can solve the limited application, poor operability, pressurized steam drafting device structure Complexity and other issues, to achieve the effect of simplifying the process, good performance and quality

Active Publication Date: 2016-06-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the drawing process mainly leads to the destruction of the PAN crystallization area, forming a large number of stress concentration points and defects, so that it is impossible to achieve high-strength drafting of PAN-based carbon fiber precursors through the dry heat drawing process
In addition, the pressurized steam drafting device has complex structure, high investment, and poor operability, which limit its application

Method used

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  • A new drawing method in the preparation process of polyacrylonitrile-based carbon fiber precursor
  • A new drawing method in the preparation process of polyacrylonitrile-based carbon fiber precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: one-step drying drafting 1KPAN base carbon fiber precursor

[0023] After coagulation-water washing-hot water drawing-oiling process, the 1K PAN-based carbon fiber precursor is rolled by rollers so that the moisture content in the tow is 30%; the tow is spread to make the thickness 0.10 mm; then It goes into a hot box for drying-drawing. The hot box temperature was set at 140°C and the residence time in the hot box was 3 seconds. The fiber precursors can be drawn up to 3.5 times. Then enter the subsequent heat setting process, and then wind up to obtain the PAN-based carbon fiber precursor. The tensile strength of each single filament in the fiber bundle is measured to be about 55-60 cN / dtex, and the elongation at break is about 10-16%.

Embodiment 2

[0024] Embodiment 2: one-step drying drafting 1KPAN base carbon fiber precursor

[0025] After coagulation-water washing-hot water drawing-oiling process, the 1K PAN-based carbon fiber precursor is rolled by rollers so that the moisture content in the tow is 25%; the tow is spread to make the thickness 0.15 mm; then It goes into a hot box for drying-drawing. The hot box temperature was set at 160°C and the residence time in the hot box was 3 seconds. The fiber precursors can be drawn up to 5.5 times. Then enter the subsequent heat setting process, and then wind up to obtain the PAN-based carbon fiber precursor. The tensile strength of each single filament in the fiber bundle is measured to be about 55-75 cN / dtex, and the elongation at break is about 8-12%.

Embodiment 3

[0026] Embodiment 3: one-step drying drafting 3KPAN base carbon fiber precursor

[0027] After coagulation-water washing-hot water drawing-oiling process, the 3K PAN-based carbon fiber precursor is rolled by rollers so that the moisture content in the tow is 35%; the tow is spread to make the thickness 0.10 mm; then It goes into a hot box for drying-drawing. The hot box temperature was set at 150°C and the residence time in the hot box was 4 seconds. The fiber precursors can be drawn up to 4.5 times. Then enter the subsequent heat setting process, and then wind up to obtain the PAN-based carbon fiber precursor. The tensile strength of each single filament in the fiber bundle is measured to be about 55-75 cN / dtex, and the elongation at break is about 8-12%.

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Abstract

The invention discloses a novel drawing method in preparation process for polyacrylonitrile-based carbon fiber precursor, wherein the PAN-based fiber can be directly guided to the drying-drawing process for thermoforming operation after the oiling process without dry densifying process, namely, and only one drying-drawing process is implemented between the oiling process and the thermoforming process. The method realizes high power drawing effect while shortening and simplifying the production processes for PAN-based carbon fiber, reducing the equipment investment and saving the cost, the PAN macromolecular chain sufficient orientation and PAN crystal or quasi-crystal refining can be realized and the method is beneficial for raising the quality and performance for the PAN-based carbon fiber.

Description

technical field [0001] The invention belongs to the field of fiber precursor preparation, and relates to a new drafting method in the preparation process of polyacrylonitrile-based carbon fiber precursor, in particular to the use of one-step drying-drawing method in the preparation process of polyacrylonitrile-based carbon fiber precursor. The method of stretching process. Background technique [0002] As an important high-performance fiber, polyacrylonitrile (PAN)-based carbon fiber has been widely used in the field of high-performance composite materials as a reinforcing material. However, in improving the quality and quality stability of PAN-based carbon fiber products, product application adaptability and Further improvements are still needed to reduce production costs. [0003] Since the quality of PAN-based carbon fiber precursors has a significant impact on the quality of the final carbon fiber, in the conventional production process of PAN-based carbon fiber precurs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D10/06D01D11/02D01D5/12
Inventor 刘瑞刚徐坚康宏亮黄勇
Owner INST OF CHEM CHINESE ACAD OF SCI
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