纳米TiO_2溶胶W/O型乳液的稳定性及其微胶囊化研究  

Investigation on the Stability of W/O Emulsion and Microencapsulation of Nano-TiO_2 Sol

作　　者：李洪广[1] 闫军[1] 杜仕国[1] 汪明球[1] 秦浩[1] 

机构地区：[1]军械工程学院三系,河北石家庄050003

出　　处：《高校化学工程学报》2014年第4期858-863,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51272284);军械工程学院院基金(YJJXM11016)

摘　　要：在W／O／W复相乳液体系中，TiO2溶胶W／O型乳状液的稳定性对所制备的做胶囊形貌影响很大。以破乳率为衡量标准，借助显做镜观察，探讨了内水相含量、Span-80用量、乳化速率和乳化时间等参数对W／O型乳状液稳定性的影响。结果表明，当TiO2溶胶含量为50％（v）、Span-80体积分数为5％时，乳状液的稳定性较好，存在较优的乳化速率8000～10000r·min^-1，和乳化时间8～10min。以聚乙烯醇（PVA）水溶液为外水相、戊二醛（GA）为交联剂，在稳定的W／O型乳状液基础上所制备的做胶囊粒径均匀，分散性好。热分析表明，做胶囊中TiO2的含量约为35％。The morphology of microcapsules prepared with W/O/W multiphase emulsions is largely determined by the stability of TiO2 sol in W/O emulsion. The effects of inner water phase content, Span-80 concentration, emulsifying velocity and time on the stability of W/O emulsion were studied using demulsification ratio as the criteria, and a microscope was used to observe the samples directly. The results show that the emulsion is stable when the content of TiO2 sol is 50%（v） with the amount of Span-80 in the oil phase of 5%, and the optimal emulsifying velocity is 8000-10000 r.min^-1 with an emulsifying time of 8-10 min Under these conditions, microcapsules with uniform particle size and good dispersion were obtained when using polyvinyl alcohol aqueous solution as the external water phase and glutaric dialdehyde as the cross linker. Thermal analysis shows that the TiO2 content is about 35% in the microcapsules.

关 键 词：TIO2溶胶 W O型乳状液 W O W复相乳液 微胶囊 

分 类 号：TQ110.6[化学工程—无机化工]