Method for producing carbon fiber and carbon fiber produced using same
AssigneeHyosung Advanced Materials Corporation
InventorsHee Rok Jung, Cheol Kim
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Abstract
The present invention is a method for producing carbon fiber, characterized by using a carbon-fiber precursor produced from a polymer having a narrow molecular weight distribution and by applying only a small amount of a smoothing agent, composed of a specific component, to the carbon fiber surface immediately before winding of carbon fiber. According to the present invention, it is possible to stably produce carbon fiber, which has excellent dispersibility and do not deteriorate in quality and quality even when a sizing agent is not attached to the carbon fiber surface. In addition, the produced carbon fiber is suitable for use in a composite material which is produced by high-temperature processing using a thermoplastic resin.
Claims6
A method of producing a carbon fiber, comprising:
- dry-wet-spinning an acrylonitrile-based polymer having a molecular weight distribution of 1.6 to 1.9 so as to obtain a polyacrylonitrile-based carbon-fiber precursor fiber;
- subjecting the polyacrylonitrile-based carbon-fiber precursor fiber to a thermally stabilizing treatment process, a pre-carbonization process and a carbonization process so as to obtain a carbon fiber, and
- applying only a smoothing agent to a surface of the carbon fiber after the carbonization process and immediately before winding of the carbon fiber, without applying a sizing agent composed of a resin component to the surface of the carbon fiber,
- wherein the smoothing agent is at least one selected from the group consisting of an alkyl ether compound having 6 to 35 carbon atoms, an aliphatic ester compound having 6 to 35 carbon atoms, an aromatic ester compound having 6 to 35 carbon atoms, and an ether ester compound having 6 to 35 carbon atoms.
Dependencies are inferred from the claim text.