Carbon fiber manufacturing method

Abstract

A carbon fiber manufacturing method is provided. A carbon fiber precursor fiber bundle is performed with a high-temperature carbonization step to form a carbon fiber, and then the carbon fiber is performed with a plasma surface treatment so that the surface of the carbon fiber is formed with a plasma-modified configuration which is relatively rougher. Finally, the surface of the carbon fiber is coated with a resin oiling agent to obtain the carbon fiber having the resin oiling agent thereon. Particularly, through a plasma surface treatment step, the surface of the carbon fiber is roughened and provided with functional groups, which is beneficial to enhance the interface bonding of the resin oiling agent and the carbon fiber. The structure of the carbon fiber is more stable and reliable. The cost of the carbon fiber production equipment and the working time can be reduced effectively.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a carbon fiber manufacturing technique, and more particularly to a carbon fiber manufacturing method which can greatly improve the sizing quality of a carbon fiber and effectively reduce the cost of the carbon fiber production equipment and the working time.BACKGROUND OF THE INVENTION[0002]Carbon fibers are classified into carbon fibers or graphite fibers according to their carbon contents, which have excellent mechanical properties and electrical properties and can be widely used in various applications. A conventional carbon fiber is achieved by bundling precursor fibers, such as polyacrylonitrile fibers, to form a carbon fiber precursor fiber bundle, and then the carbon fiber precursor fiber bundle is calcined (high-temperature carbonization) to form the carbon fiber.[0003]There are various precursor fibers of carbon fibers on the market, such as rayon, poly vinyl alcohol, vinylidene chloride, polyacrylonitrile (PAN), p...

AI Technical Summary

Benefits of technology

The present invention provides a carbon fiber manufacturing method that improves the sizing quality of carbon fiber and reduces the cost of production equipment and working time. The method uses plasma surface treatment to roughen the surface of the carbon fiber and provide functional groups, which enhances the interface bonding of resin oiling agent and carbon fiber in the sizing step. This results in a more stable and reliable carbon fiber structure. The same apparatus can be used for carbon fiber precursor fibers with or without pre-oxidation treatment, and can produce general or high modulus carbon fibers as well. The method is a dry-type and fast surface treatment technique that reduces equipment and working time costs.

Problems solved by technology

Since these impurities are present between the surface of the carbon fiber and the resin oiling agent, the adhesion between the carbon fiber and the resin oiling agent is insufficient, and the purpose of protecting the fiber cannot be achieved

Furthermore, in the high-temperature carbonization step, the surface of the carbon fiber is excessively finely formed due to high-temperature sintering, and there are few functional groups on the surface.

As a result, the fiber and the resin oiling agent cannot be bonded fully in the sizing step.

A relatively long period of time is required.

Besides, the heat treatment is always performed with a large number of fibers at a time, so it is difficult to control the processing quality.

This also takes more time.

Moreover, a change of the electrolyte may affect the processing quality.

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