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Apparatus for manufacturing carbon fiber by using microwaves

Pending Publication Date: 2020-02-20
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a carbonization furnace that uses microwaves to increase the speed at which carbon fiber is converted to carbon. The furnace includes a heating body that can use a variety of precursors for the fiber, while the entire furnace is not heated, resulting in increased energy efficiency compared to traditional carbonization methods. This allows for the production of carbon fibers in a faster and more energy-efficient manner.

Problems solved by technology

However, since carbon fiber is expensive, the commercialization of carbon fiber is limited, and thus, there is an urgent demand for a development of a technology for mass producing carbon fiber having high performance at low cost.
The carbonization process using the electric carbonization furnace has a scheme in which heat is transmitted to carbon fiber by an internal temperature of the carbonization furnace or heat moves in a direction from an outer side to an inner side of the fiber, so that there is a problem in that energy efficiency is not high.
Further, the carbonization process in the related art is a scheme in which the entirety of the carbonization furnace is heated in order to increase an internal temperature of the carbonization furnace, and a temperature of a heating furnace needs to be maintained higher than a carbonization temperature of a precursor, so there is a problem in that heat resistance is required.

Method used

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  • Apparatus for manufacturing carbon fiber by using microwaves
  • Apparatus for manufacturing carbon fiber by using microwaves
  • Apparatus for manufacturing carbon fiber by using microwaves

Examples

Experimental program
Comparison scheme
Effect test

experimental example 1

[0043]Tensile strength and modulus were compared by using carbon fiber manufactured by using a carbonization furnace including a heating body having a volume of about 8% of a volume of a main body and the carbon fiber manufactured by using the carbonization furnace including the heating body having a volume of about 0.1% to 5% of a volume of the main body according to the exemplary embodiment of the present invention.

[0044]To this end, an experiment was performed on one carbon fiber product manufactured by using the carbonization furnace including the heating body having the volume of about 8% and two carbon fiber products according to the exemplary embodiment of the present invention.

[0045]In Comparative Example 1, Example 1, and Example 2, polyacrylonitrile fiber was prepared as a precursor and was heat treated in an air atmosphere at a temperature of 280° C. for two hours.

[0046]In Comparative Example 1, stabilized polyacrylonitrile fiber was inserted into a carbonization furnace ...

experimental example 2

[0052]Temperatures were compared between Comparative Example 2, that is a carbonization furnace including no heating body, and Example 3, that is the carbonization furnace including the heating body having the volume of 0.1% to 5% of the volume of the main body according to the exemplary embodiment of the present invention. Herein, the heating body of Example 3 includes silicon carbide (SiC) having a volume corresponding to about 0.13% of a volume of a main body.

[0053]The carbonization furnaces of Comparative Example 2 and Example 3 have the same size, and a time at which an internal temperature of the carbonization furnace reaches 1,000° C. by applying microwaves of 1.2 kW was measured.

TABLE 2Comparative Example 2Example 3Presence ofx∘heating bodyReach time atNot reached21,000° C. (minute)

[0054]Referring to the Table, it can be seen that in Comparative Example 2, the carbonization furnace has a temperature lower than 300° C. even after ten minutes, but in Example 3, the carbonizati...

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Abstract

The present invention relates to an apparatus for manufacturing carbon fiber by using microwaves, and more particularly, to an apparatus for manufacturing carbon fiber by using microwaves, which directly or indirectly heats and carbonizes a carbon fiber precursor by using microwaves, so that energy efficiency is improved because an entire carbonization furnace is not heated, and a property of the precursor is adjusted by a simpler method by using microwaves.

Description

[0001]The present application is a National Stage entry of International Application No. PCT / KR2017 / 015018, filed Dec. 19, 2017, and claims priority to and the benefit of Korean Patent Application No. 10-2016-0173883 filed in the Korean Intellectual Property Office on Dec. 19, 2016, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to an apparatus for manufacturing carbon fiber by using microwaves. More particularly, the present invention relates to an apparatus and techniques for manufacturing carbon fiber by using microwaves which directly or indirectly heats and carbonizes a carbon fiber precursor, so that energy efficiency is improved because an entirety of a carbonization furnace is not heated, and a property of the precursor is adjusted by a simpler method by the microwaves.BACKGROUND ART[0003]Carbon fiber can be obtained by pyrolyzing an organic precursor material in the form of fiber manufactured from polyacr...

Claims

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Application Information

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IPC IPC(8): D01F9/32D01F9/22D06M10/00
CPCD06M10/003D01F9/322D10B2101/12D01F9/225D01F9/22D01F9/32
Inventor KIM, SUJINLEE, ILHACHO, JOON HEEKIM, KI HWANJANG, MYUNGSU
Owner LG CHEM LTD
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