作　　者： ; ; ; ;

机构地区： 华南农业大学理学院应用化学系

出　　处： 《现代农药》 2009年第4期15-18,共4页

摘　　要： 以异佛尔酮二异氰酸酯三聚体、二甲苯、毒死蜱为油相,聚乙烯醇、水、十二烷基磺酸钠为水相,通过界面聚合法,制备出高稳定性毒死蜱微胶囊悬浮剂。通过扫描电镜照片研究了微胶囊的表面形貌和平均粒径,用紫外分光光度法研究了微胶囊对毒死蜱的初期包封率及其释放特性;壁材及微胶囊的热行为通过热重分析进行了表征;用斜纹夜蛾3龄幼虫进行了生测初步试验。结果表明,微胶囊是平均粒径为10μm左右的球形颗粒;壁材热稳定性良好,微胶囊的初期包封率均高于95%,在低于45℃的水相中毒死蜱在微胶囊中能长期稳定储存,微胶囊化的毒死蜱具有持久的生物毒杀性。 With trimer of isophorone diisocyanate, xylene and chlorpyrifos as oil phase, polyvinylalcohol, water and dodecanesulfonic acid sodium as water phase, and by interfacial polymerization method, microcapsules containing chlorpyrifos were prepared under different shear rates at room temperature. The surface morphology and size of microcapsule were studied by scanning electron microscopy. The release characterizatics, prilimenary microencapsulated efficiecy of chlorpyrifos were also investigated by UV-spectrophotometric method. The thermal stability of wall material was investigated by thermogravimetric analysis. The biotoxic sustainability of the microcapsule suspension wese studied with 3rd-instar spodoptera litura Fabricius. The results shown that the microcapsules were quasi spherical particles with about 10~trn in diamater, the prilimenary microencapsulated efficiecies were higher than 95%, and the release rate of chlorpyrifos in microcapsules in water phase was extremely slow, and the chlorpyrifos microcapsule suspendoid were of long biotoxic sustainability compared with chlorpyrifos emulsion.

关 键 词： 三异氰酸酯 毒死蜱 微胶囊 生物毒力持效性

领　　域： [化学工程]