Coated pitch is of great importance to improving the performance of lithium battery anode materials.By means of thermal polycondensation,coated pitch is prepared commonly with ethylene tar pitch as feedstock.Study is made for impact of reaction temperature and time on basic indicators(softening point,TI,QI and coking value)and optical microstructure of coated pitch.The study shows that with N2 as the protective gas,isotropic pitch(softening point of 200℃,35.47%TI,1.11%QI,and coking value of 67%)is prepared when thermal polycondensation occurs at 390℃for 4 h.Through FTIR and TGA analysis,Iar of ethylene tar pitch and isotropic pitch of high softening point is 0.526 6 and 0.537 7 respectively,and the residual mass after pyrolysis at 700℃is 20.22%and 50.79%respectively.This demonstrates that after thermal polycondensation of ethylene tar pitch,the obtained isotropic pitch of high softening point has better aromatic property and thermal stability.It is a kind of high quality coated pitch.
关键词
乙烯渣油沥青/热缩聚/包覆沥青
Key words
Ethylene tar pitch/Thermal polycondensation/Coated pitch
维普
万方数据