500～700μm直径双层空心微球制备技术研究

Study of Preparation for Double Hollow Microspheres With Diameter of 500-700μm

摘要: 采用聚苯乙烯微球臭氧化改性技术和搅拌桨叶轮结构优化技术，提高聚苯乙烯（PS）与聚乙烯醇（PVA）之间的作用强度，优化体系容器内的流场运动环境，制备了500～700 μm直径的PS-PVA双层空心微球，并考察了液滴初始密度与溶剂密度匹配关系对最终PVA涂层均匀性的影响。结果表明，固化温度为37 ℃、溶剂-液滴初始密度差在0.010 g/cm³附近及固化温度为20 ℃、溶剂-液滴初始密度差在0.015～0.020 g/cm³附近能获得较好的PVA壁厚均匀性。

Abstract: Adopting ozone modified polystyrene (PS) microsphere technique and optimizing technique of the structure of lobed wheels, the interaction between PS and poly-vinyl alcohol (PVA) was improved, and the flow field movement was also ameliorated. PS-PVA double hollow microspheres with diameter of 500-700 μm were prepared, and the influence of density matching between initial emulsion particle and solvent on the uniformity of PVA layer was systematically studied. The results show that density contrast of solvent particle about 0.015-0.020 g/cm³ at 20 ℃ and 0.010 g/cm³ at 37 ℃ can form well homogeneous PVA layers.