Method for preparing carbon fiber and precursor fiber for carbon fiber

摘要

The method for preparing a carbon fiber of the present invention includes the steps of: preparing a polyacrylonitrile-based polymer solution; spinning the polyacrylonitrile-based polymer solution to prepare a precursor fiber for a carbon fiber, the precursor fiber having a water content of 20-50%; converting the precursor fiber for a carbon fiber into a preliminary flame-retarded fiber while stretching the precursor fiber for a carbon fiber at an elongation rate of −10˜−0.1% or 0.1˜5% at 180˜220° C. in air; converting the preliminary flame-retarded fiber into a flame-retardant fiber while stretching the preliminary flame-retarded fiber at an elongation rate of −5˜5% at 200˜300° C. in air; and heating the flame-retardant fiber under an inert atmosphere to carbonize the flame-retardant fiber.

主权项

1. A method of preparing a carbon fiber, comprising the steps of:
preparing a polyacrylonitrile-based polymer solution; spinning the polyacrylonitrile-based polymer solution to prepare a precursor fiber for a carbon fiber, the precursor fiber having a water content of 20-50%; converting the precursor fiber for a carbon fiber into a preliminary flame-retarded fiber while stretching the precursor fiber for a carbon fiber at an elongation rate of −10˜−0.1% or 0.1˜5% at 180˜220° C. in air; converting the preliminary flame-retarded fiber into a flame-retardant fiber while stretching the preliminary flame-retarded fiber at an elongation rate of −5˜5% at 200˜300° C. in air; and heating the flame-retardant fiber under an inert atmosphere to carbonize the flame-retardant fiber.