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Raw material pitch for carbon fiber production

A carbon fiber manufacturing and carbon fiber technology, which is applied in the chemical characteristics of fibers, processing tar pitch/petroleum pitch/natural pitch by heating, and chemically processing tar pitch/petroleum pitch/natural pitch, etc., which can solve the problem of increasing the cost of carbon fiber manufacturing. problem, to achieve the effect of cheap manufacturing

Active Publication Date: 2018-01-02
KOBE STEEL LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned modification treatment of coal tar pitch becomes a factor that pushes up the production cost of carbon fibers.

Method used

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  • Raw material pitch for carbon fiber production
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0077] The above-mentioned embodiments do not limit the configuration of the present invention. Therefore, in the above-mentioned embodiment, omission, replacement or addition of constituent elements of each part of the above-mentioned embodiment may be made based on the description of this specification and technical common sense, and it should be construed that all of these belong to the scope of the present invention.

[0078] As an example, in this method of producing raw material pitch for carbon fiber production, the ash and the like in the slurry may not be separated from the ash-free coal in the pyrolyzed product forming process, but the ash and the like may be separated from the ash and the like in the next separation process. The insoluble components in the ashless coal are separated together.

[0079] In addition, in the production method of the raw material pitch for carbon fiber production, the heat treatment step may be omitted.

[0080] 【Example】

[0081] Here...

Embodiment 1

[0085] As the raw coal, bituminous coal produced in Australia with an oxygen content of 6.5% by mass on an anhydrous and ash-free basis was used. First, 1 kg of the above-mentioned bituminous coal pulverized to 1 mm or less was mixed with 5 kg of methylnaphthalene, charged into an autoclave, kept at 400° C. for 1 hour in a nitrogen atmosphere, and then cooled to obtain a pyrolyzed product. Next, 5 kg of methylnaphthalene was further added to the pyrolyzed product, stirred at an extraction temperature of 60° C. for 1 hour, the soluble components were extracted, filtered, and the obtained filtrate was distilled under reduced pressure to separate the soluble components. This soluble component was heat-treated for 1 hour in a nitrogen atmosphere at a heat treatment temperature of 230° C., whereby the raw material pitch for carbon fiber production of Example 1 was obtained.

Embodiment 2

[0087] In Example 2, trial production was carried out under the same conditions as in Example 1 above, except that the extraction temperature was 80°C. In Example 3, trial production was carried out under the same conditions as in Example 1 above, except that the extraction temperature was 100°C. In Example 4, a trial production was carried out under the same conditions as in Example 1 above except that the heat treatment temperature was set to 250°C. In Example 5, trial production was carried out under the same conditions as in Example 1 above, except that the extraction temperature was 80°C and the heat treatment temperature was 250°C. In Example 6, trial production was carried out under the same conditions as in Example 1 above, except that the extraction temperature was 100°C and the heat treatment temperature was 250°C.

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Abstract

The present invention addresses the problem of providing a raw material pitch for carbon fiber production with which it possible to produce carbon fibers having excellent tensile strength relatively inexpensively. This raw material pitch for carbon fiber production is a pitch obtained from coal for producing carbon fibers by melt spinning, the raw material pitch for carbon fiber production characterized in that the content of oxygen is 1.0 mass% or higher, and the content of toluene solubles is 20 mass% or higher. The coal may be bituminous or sub-bituminous coal. The raw material pitch for carbon fiber production may be obtained by heat treatment of a soluble component separated from a thermal decomposition product of coal in a solvent by solvent extraction treatment at a temperature of less than 300C, at a temperature of 150C or higher.

Description

technical field [0001] The present invention relates to raw material pitch for carbon fiber production. Background technique [0002] Carbon fibers are widely used, for example, as reinforcements for structural materials such as resins, concrete, and ceramics. In addition, carbon fiber is also utilized as, for example, a heat insulating material, an activated carbon raw material, an electrically conductive material, a heat conductive material, and the like. [0003] Carbon fibers are generally produced by spinning synthetic resins such as polyacrylonitrile and pitch obtained from petroleum or coal into fibers, and infusible (air oxidation) and carbonization of the filaments. Among the above-mentioned raw materials, coal tar pitch is a viscous black substance obtained by distilling off volatile components such as naphthalene from coal tar, a by-produced liquid substance, when coal is dry-distilled to produce coke. . Such coal pitch is a mixture of various compounds contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02D01F9/15
CPCC08L95/00C10C3/002C10C3/08D01F9/15C10C3/02C10C3/026
Inventor 滨口真基和田祥平井上聪则尹圣昊
Owner KOBE STEEL LTD
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