添加剂对中间相沥青炭微球形成的影响

Effects of additives on preparation of mesocarbon microbeads

以中温煤沥青为原料,分别添加3%(质量分数)的炭黑、硫、氯化铝和对甲苯磺酸于420℃保温2h制备MCMB,研究比较了这4种添加剂对MCMB制备的影响。实验结果表明,炭黑、氯化铝和对甲苯磺酸作添加剂均能制备小粒径的MCMB,其中炭黑作用下制备的MCMB形度好、粒径均一,但表面粘附有炭黑颗粒且收率低;氯化铝作用下制备的MCMB球形度好,表面光洁,单分散性好,粒径分布相对集中,收率较高;对甲苯磺酸作用下制备的MCMB粒径较小时粘结融并现象严重,粒径较大时有较好的球形度与单分散性;硫作添加剂制备的MCMB粒径较大,球形度差,粘结现象严重。氯化铝是其中较好的添加剂。

Four types of mesocarbon microbeads（MCMB） were prepared from coal tar pitch heat-treated at 420℃ for 2h with carbon black, sulfur, aluminum chloride and p-toluene sulphonic acid as additive, respectively, the effects of these four additives on preparation of MCMB have been studied. The results indicate that carbon black, aluminum chloride and p-toluene sulphonic acid are helpful for preparation of Smaller MCMB. MCMB prepared with carbon black as additive had good sphere and uniform diameter, but the yield of MCMB was low and on the surface of the spherules the carbon black particles were adsorped. MCMB prepared in the presence of aluminum chloride had good sphere, smooth surface, good monodispersity and high yield. Using p-toluene sulphonic acid as additive, small MCMB with diameter from 0.5-0.8 bonded seriously and MCMB with diameter more than 1 had good sphere and monodispersity. The MCMB prepared with sulfur had bad sphere, relatively large particle size and bonded each other, aluminum chloride is the optimal additive among them.