通过在煤焦油沥青中添加石油沥青获得沥青甲苯胶体溶液,然后与聚乙烯醇(PVA)的甘油溶液乳化,制备了煤沥青基炭微球.为了阐明沥青在甲苯中的溶解性及其与PVA中憎水的亚甲基亲合力对于微球形成的影响,在煤沥青中添加了不同比例的与PVA中憎水的亚甲基更具亲合力的石油沥青,建立了一个微球成形机理的模型.研究发现,添加石油沥青可以促进乳化液中沥青分子与分散剂界面上表面活性剂分子的取向稳定性,从而明显改善沥青微球的球形度.石油沥青的添加降低了混合后沥青的软化点,为使沥青微球的软化点高于空气氧化始温,需要选择适当的添加比例.
Coal-tar pitch-based carbon microspheres were prepared by adding petroleum pitch using emulsifying pitch-toluene colloidal solution in polyvinyl alcohol (PVA) glycerol solution. To clarify the influence of pitch solubility in to￣luene and its affinity with the hydrophobic methylene groups of PVA on the sphere formation, petroleum pitch ha￣ving a high affinity with methylene groups was added to the coal tar pitch in different proportions. A model was proposed to tentatively elucidate the sphere formation mechanism. It was found that petroleum pitch addition could improve the sphericity of pitch spheres by stabilizing the surfactant orientation on the interface between pitch molecules and dispersant. Adding petroleum pitch lowered the softening point of mixed pitch and an appropriate amount of addition was needed to ensure a high softening point of mixed pitch spheres above the reaction threshold temperature for air-oxidative stabilization.
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