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

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500~700μm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0.010g/cm3附近及固化温度为20℃、溶剂-液滴初始密度差在0.015~0.020g/cm3附近能获得较好的PVA壁厚均匀性。

Adopting ozone modified polystyrene（PS）microsphere technique and optimizing technique of the structure of lobed wheels,the interaction between PS and polyvinyl alcohol（PVA）was improved,and the flow field movement was also ameliorated. PS-PVA double hollow microspheres with diameter of 500-700μm 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 0.015-0.020g/cm3 at 20℃and 0.010g/cm3 at 37℃ can form well homogeneous PVA layers.