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Method for producing carbon fibers

a carbon fiber and fiber technology, applied in the direction of fiber chemical features, melt spinning methods, textiles and papermaking, etc., can solve the problems of increasing the cost of carbon fiber production, difficulty in stably and efficiently producing carbon fibers, etc., and achieves low content, high quality, and high efficiency of spinning

Inactive Publication Date: 2018-02-22
KOBE STEEL LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The present invention describes a method for producing high-quality carbon fibers at a relatively low cost. The method involves obtaining pitch by heat-treating soluble components from an ash-free coal and subjecting it to melt spinning, infusibilization, and carbonization. The pitch used in this method contains low amounts of components that inhibit spinning, leading to a high efficiency of spinning. This allows for the production of high-quality carbon fibers at a low cost.

Problems solved by technology

It is therefore difficult to stably and efficiently produce carbon fibers.
Furthermore, these impurities can be causative of defects of the carbon fibers to be produced.
However, such coal derived pitch modification treatments result in an increase in the cost of carbon fiber production.

Method used

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  • Method for producing carbon fibers

Examples

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examples

[0065]The present invention is explained below in detail by reference to Examples, but the present invention should not be construed as being limited on the basis of the Examples.

[0066]Carbon fibers of Examples 1 to 4 were produced experimentally through the ash-free coal formation step, separation step, heat treatment step, melt spinning step, infusibilization step, and carbonization step which are explained below. Carbon fibers of Comparative Example 1 were produced experimentally by omitting the heat treatment step from Example 1. Furthermore, carbon fibers of Comparative Example 2 were produced experimentally by melt-spinning the ash-free coal.

[0067]Differences in production conditions among Examples 1 to 4 and Comparative Examples 1 and 2 and various measured values obtained during the production thereof are shown in Table 1.

TABLE 1ComparativeComparativeExample 1Example 2Example 3Example 4Example 1Example 2kind of solventpyridinemethyl-methyl-tetrahydrofuranpyridine—naphthalene...

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Abstract

A method for producing a carbon fiber includes a separation step of separating an ash-free coal obtained from a bituminous coal or a sub-bituminous coal, into a soluble component(s) and an insoluble component(s) by a solvent extraction treatment, a heat treatment step of heat-treating the soluble component(s), a melt spinning step of melt-spinning the soluble component(s) subjected to the heat treatment, an infusibilization step of infusibilizing a filament body obtained by the melt spinning, and a carbonization step of carbonizing the filament body subjected to the infusibilization.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for producing carbon fibers.BACKGROUND ART[0002]Carbon fibers are in extensive use as a reinforcing material for structural materials such as, for example, resins, concrete and ceramic. Carbon fibers are used also as, for example, a heat insulator, raw material for activated carbon, electrically conductive material, and heat transfer material.[0003]Carbon fibers are produced by forming a synthetic resin, e.g., polyacrylonitrile, or a pitch obtained from petroleum or coal into fibers by spinning and then subjecting the fibers to infusibilization (air oxidation) and carbonization. Coal derived pitch is a viscous black substance and is a residue that remains after volatile components including naphthalene are taken out by distillation from coal tar, which is a liquid substance yielded as a by-product when producing a coke by dry distillation of coal. Such coal derived pitch is a mixture of a large number of compounds includ...

Claims

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Application Information

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IPC IPC(8): D01F9/15C10G1/04D01D5/08D01D10/02
CPCD01F9/15C10G1/04D01D5/08D01D10/02
Inventor HAMAGUCHI, MAKIWADA, SHOHEIINOUE, TOSHINORIYOON, SEONGHOMIYAWAKI, JIN
Owner KOBE STEEL LTD
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