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Apparatus for producing pitch-based chopped carbon fiber and producing method of the chopped fiber

a technology of carbon fiber and apparatus, which is applied in the direction of manufacturing tools, melt spinning methods, applications, etc., can solve the problems of low strength and easy breakage, difficult to produce carbon fiber in continuous way, and carbon fiber produced by the prior art, etc., to maximize the mechanical strength of a pitch precursor, high cost, and excellent strength

Inactive Publication Date: 2015-12-31
OCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The method described in this patent produces a strong pitch that can be used to make carbon fiber. This method also solves problems with fiber breakage and allows for the pitch to be arranged in a strong direction without additional processes. Using this method can create a more cost-effective carbon fiber that is stronger and more versatile than current options.

Problems solved by technology

The isotropic pitch-based carbon fiber which is produced by the prior art has drawbacks that its molecular structures are randomly distributed and it has low strength and is easy to break, which makes it hard to produce a carbon fiber in continuous way.
Thus, the carbon fiber produced by the prior art has drawbacks that its application is restricted due to its general purpose grade and it cannot be used for a structure requiring a strength of about 1.5 GPa.

Method used

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  • Apparatus for producing pitch-based chopped carbon fiber and producing method of the chopped fiber
  • Apparatus for producing pitch-based chopped carbon fiber and producing method of the chopped fiber
  • Apparatus for producing pitch-based chopped carbon fiber and producing method of the chopped fiber

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0088]100 wt % isotropic pitch with a softening point of 280° C. was melt-spun and wound with 500 m / min to produce a pitch fiber. The pitch fiber which was spun (melt spun) while wound on the rotation roll was cut in a constant length of 3 cm. The cut fiber (chopped fiber) was heated to a temperature of 260° C. for 1 hour to perform a first non-embodiment process, and then, the chopped fiber, which had undergone the first infusibilized, was processed in a second infusibilization process in a infusibilizing oven at a speed of 1° C. / min within a infusibilization temperature of 280-320° C. The chopped fiber, which had undergone the second infusibilization process, was carbonized at a heating rate of 10˜20° C. / min for 10 minutes at 1000° C. and finally transformed into a chopped carbon fiber. An average fiber length of the produced carbon fiber was 3 cm, an average diameter was 8 μm, and tensile strength was 1.5 GPa.

embodiment 2

[0089]All conditions are the same Embodiment 1 except that the speed of the rotation roll is 500 m / min. An average fiber length of the produced carbon fiber was 3 cm, an average diameter was 10 μm, and tensile strength was 1.2 GPa.

embodiment 3

[0090]All conditions are the same Embodiment 1 except that the speed of the rotation roll is 500 m / min. An average fiber length of the produced carbon fiber was 6 cm, an average diameter was 10 μm, and tensile strength was 1.2 GPa.

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Abstract

The present invention relates to an apparatus for producing a pitch-based chopped carbon fiber and a producing method for the chopped fiber and, more specifically, to an apparatus and a method for drawing an ejected pitch using melt spinning and producing carbon fibers as chopped fibers in a continuous manner.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of Korean Patent Application No. 10-2014-0078927, filed on Jun. 26, 2014 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.TECHNICAL FIELD[0002]The present invention relates to an apparatus for producing a pitch-based chopped carbon fiber and a producing method for the chopped fiber and, more specifically, to an apparatus and a method for drawing an ejected pitch using melt spinning and producing carbon fibers as chopped fibers in a continuous manner.BACKGROUND[0003]In a general manufacturing method of a carbon fiber, polyacrylonitrile, a petroleum- or coal-based pitch (isotropic or anisotropic), a phenol resin, etc., which is a starting material of the carbon fiber, is thermally melted, and then melt spinning or melt blown spinning is performed, or the thermally melted result dissolves in a solvent and then undergoes solution spinning...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01D5/26D01F9/12D01D5/08
CPCD10B2101/12D01F9/322D01D5/08D01F9/145D01F9/155
Inventor YOON, KWANG-EUILEE, HYUN-CHULKIM, HAG-CHEON
Owner OCI
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