改性煤沥青中间相的微观结构研究

Mesophase microstructure of modified coal tar pitch

以对甲基苯甲醛(4-MB)为改性剂,在对甲苯磺酸(PTS)的催化作用下对煤沥青(CTP)进行改性制取沥青中间相。采用偏光显微镜研究改性煤沥青的光学组织结构;采用扫描电镜(SEM)观察改性煤沥青的形貌。结果表明:随对甲基苯甲醛的用量、温度及热处理时间的不同,改性煤沥青可得到超镶嵌(SM)、小域(SD)和广域(D)3种光学组织结构;在一定的工艺条件下,改性煤沥青的光学组织结构显著改善,出现了大量的中间相小球体;改性后煤沥青出现较好的纤维状结构。因此,改性后的煤沥青有望成为优质的沥青中间相。

The coal tar pitch （CTP） was modified to synthesize the pitch mesophase by using 4-methyl benzaldehyde （4-MB） as modifier and p-toluene sulfonic acid （PTS） as catalyst. The polarized microscope was employed to study the optical structure of pyrolyzed substances of the modified CTP and its shapes were observed through SEM. The results show that with different doses of 4-MB, temperature and beating time, the optical texture of pyrolyzed substances varies from coarse-flow anisotropy elongated to domains and in certain conditions, the modification contributes to an improvement in the optical texture which appears many mesocarbon microbeads and the shapes of the modified CTP appear good fibrous structure. Therefore, the modified CTP with 4-MB is promising to become a kind of fine pitch mesophase.