硅油/煤沥青乳液制备中间相炭微球

Preparation of Mesocarbon Microbeads with Silicone Oil/Pitch Emulsion

以中温煤沥青为原料,耐高温硅油为分散剂和导热介质,通过在反应釜中混合形成硅油/煤沥青乳液来制备中间相炭微球(Mesocarbon Microbeads,MCMB)。利用SEM、激光粒度仪和XRD分析等,研究了硅油用量对MCMB形成的影响。结果表明:硅油添加量对MCMB的形成有重要影响,当加入少量硅油后,MCMB粒径显著减小,分布均匀,小球表面较光滑,粘结现象减少,微晶结构得到改善,但四氢呋喃不溶物(THFI)收率降低。增加硅油用量,MCMB的粒径大小和微晶结构变化不大,小球之间粘结少,THFI收率增加,但小球表面附着小颗粒。当硅油/煤沥青的质量比为3∶1时,可得到粒径分布窄,D50为0.82μm,表面比较光滑,收率为8.2%的MCMB。

Mesocarbon Microbeads（MCMB） were prepared by heat condensation in the retort with coal tar pitch and silicone oil as the dispersion and heat exchange medium.The influence of silicone oil on the preparation of MCMB was studied by SEM,laser particle size analyzer and XRD.The results showed that silicone oil content had an important influence on the formation of MCMB.After the addition of silicone oil,the spheres with uniform distribution and smooth surface had smaller diameter and better crystallite structure.At the same time,the yield of THFI and surface adhesion between spheres decreased.With increasing silicone oil content,the diameter and crystallite structure of the spheres were hardly changed.The spheres presented better dispersion and the yield increased,while some small particles attached to the surface of MCMB.When the ration of silicon oil/pitch was 3∶1,MCMB with uniform size distribution and smooth surface were obtained.D 50 of MCMB was 0.82μm,and the yield of THFI was 8.2%.