毒死蜱微胶囊化及释放性能表征

中国农业科学 ›› 2007, Vol. 40 ›› Issue (12): 2753-2758 .

毒死蜱微胶囊化及释放性能表征

赵德,韩志任,杜有辰,慕卫,刘峰

山东农业大学植物保护学院/山东省农药毒理与应用技术重点实验室

收稿日期:2006-11-20 修回日期:1900-01-01 出版日期:2007-12-10 发布日期:2007-12-10
通讯作者: 刘峰

Preparation of Chlorpyrifos Microcapsules and Its Controlled Realease Characteristics

山东农业大学植物保护学院/山东省农药毒理与应用技术重点实验室

Received:2006-11-20 Revised:1900-01-01 Online:2007-12-10 Published:2007-12-10

摘要/Abstract

摘要： 【目的】获得脲醛树脂制备毒死蜱微胶囊的配方，表征其释放性能，为优化该农药的使用性能提供依据。【方法】利用生物摄像显微镜和激光粒度分布仪研究了成囊促进剂、分散剂和添加氯化钠对微胶囊制备的影响，用气相色谱法表征毒死蜱微胶囊的释放动力学。【结果】配方中成囊促进剂选择SMA，质量分数为2.5％，分散剂为PAAS，质量分数为2.0％，添加氯化钠，质量分数为0.4％，制备的微胶囊表面形貌良好，平均粒径约10 µm。气相色谱法测定微胶囊的缓释性能，前5 d为初期快速释放阶段，符合一级动力学方程（R2＝0.9820），累计释放量达到37.32％；5～42 d为匀速释放阶段，符合零级释放特征（R2＝0.9927）。【结论】以该配方得到的毒死蜱脲醛树脂微胶囊具有良好的缓释性能，有助于延长控制期。

关键词: 原位聚合, 脲醛树脂, 毒死蜱, 微胶囊, 释放性能

Abstract: 【Objective】The controlled-release formulation of chlorpyrifos microcapsule encapsulated with UF-resin，and its controlled-realease kinetics were studied for optimizing the bioefficacy of chlorpyrifos.【Method】The effects of emulsifier, dispersant, and sodium chloride on encapsulation of microcapsule were investigated by biology photography microscope and photon correlation spectroscopy (PCS)，and the controlled-realease characteristics were studied by gas chromatography.【Result】In the optimal foumulation, the mass weights of Styrene Maleic Anhydride（SMA）as emulsifier and Sodium Polyacrylate（PAAS）as dispersant were 2.5% and 2.0% respectively. And adding sodium chloride of mass weight of 0.4% could improve appearence of microcapsule. The mean diameter of microcapsules was about 10µm，and had good surface shape. The investigation of chlorpyrifos release behavior from microcapsules showed that in early 5 days it was coincided with First-level reaction，its equation was Ln(1- Q) =-0.0835t + 4.5102（R2 ＝0.9820）.The release kinetics in 5-42days was coincided with Zero-level reaction，and followed the equation of Q = 1.6443t + 33.996（R2 ＝0.9927）.【Conclusion】Chlorpyrifos microcapsules of UF-resin displayed good controlled-realease characteristics and satisfied the necessary prerequisites for prolonging control period.

赵德,韩志任,杜有辰,慕卫,刘峰. 毒死蜱微胶囊化及释放性能表征[J]. 中国农业科学, 2007, 40(12): 2753-2758 .

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