The technological conditions of preparation of mesophase pitch by simultaneous hydrogenation-thermal condensation

In this work,the spinnable mesophase pitch was prepared through simultaneous hydrogenation-thermal condensation of coal tar pitch with tetralin as hydrogenation agent.The influences of reaction temperature and soaking time on the properties of mesophase pitch were systematically investigated.Results showed that with the reaction temperature increasing,the softening point and insoluble content of mesophase pitch were increased;the MP prepared at lower temperature is the mixture of isotropic pitch and mesophase spheres and at higher temperature is the pitch with anisotropic pitch as continuous phase.Furthermore,fixing the reaction temperature(410℃),with the reaction time increasing,softening point and insoluble content of mesophase pitch were improved remarkably.Accordingly,the mesophase texture was experienced from mesophase sphere to mosaic texture.The test of spinning property showed that the mesophase pitch prepared in 410 and 420℃ for 4h could be melt spun into fibers,which was made into carbon fibers through melt spun,oxidation and carbonization.