THE MANUFACTURING PROCESS OF ANISOTROPIC LIQUID CRYSTAL PITCH FOR THE USE OF CARBON FIBERS

摘要

Firstly, heavy oil is heat treated at 360-500 deg.C for 0.5-2 hours by elevating temperature with elevation speed 3-10 deg.C/min under the flow of inert gas with the flow speed of 0.5-4ml/sec.g, thus giving heat-treated product with boiling pointabove 200 deg.C secondly, the product is heat treated under temp. 350-500 deg.C, pressure 5-30 kg/cm2G for 0.5-3 hours. Finally the heat treated material under goes heat treatment under temp. 360-470 deg.C, pressure 0.1-10 torr for 0.5-3 hours, thus giving anisotropic liquid crystal pitch which used for manufacturing carbon fibers.