改性β-环糊精为载体的七氟菊酯微胶囊的制备及性能测试

Preparation and Performance of Modifi ed β-Cyclodextrin Microcapsules Containing Tefluthrin

[目的]制备以改性的β-环糊精为载体的七氟菊酯微胶囊。[方法]以聚乙烯醇-1788为乳化分散剂，运用溶剂挥发法制备微胶囊，使用激光粒度分析仪、光学显微镜、扫描电镜对微胶囊进行形貌表征，用紫外分光光度计研究微胶囊的缓释行为。[结果]β-环糊精与PBS按4：3的比例共混改性后制备的载体微胶囊的包封率为87．08％、载药量为57．81％，平均粒径为10μm，缓释期为25-27d。[结论]改性后的β-环糊精载体微胶囊具有较好的结构形貌，载药量和包封率均比脲醛树脂载体微胶囊高，且缓释性更好。

[Aims] The microcapsules containing tefluthrin were prepared with modified β-cyclodextrin. [Methods]The microcapsules were prepared via emulsion solvent evaporation process, and PVA-1788 was used as emulsifier. The modified β-cyclodextrin microcapsules were characterized through automatic laser granularity analyzer, optical microscope, scanning electron microscope. The released properties were studied via ultraviolet spectrophotometer. [Results] The encapsulation rates of microcapsules made by β-cyclodextrin blended with PBS according to the proportion of 4 to 3 was 87.08%, the loading rates was 57.81%, the average diameters was 10 μm, the release dates was 25-27 d. [Conclusion] The microeapsules of modified β-cyclodextrin had better surface topography, encapsulation rates and loading rates than the microcapsules of urea resin. What＇s more, its release property was longer than other proportion.