硫氟肟醚微囊悬浮剂的制备及微囊化参数

Preparation and Microencapsulation Parameters of New Pesticide HNPC-A2005 Microcapsule Suspension

[目的]硫氟肟醚在环境中降解快，持效期短。为了克服这些缺点和提高药效，对硫氟肟醚微囊悬浮剂的制备及微囊化参数进行了研究。【方法】以水为介质，以多甲基多异丙基多异氰酸酯（PAPI）和乙二醇为囊壁材料，采用界面聚合法制备了10％硫氟肟醚微囊悬浮剂。[结果]红外光谱分析表明：制备的微囊中壁材已将硫氟肟醚包封完整；微囊化参数优化条件为囊材PAPI与乙二醇的质量比为1．5：1（质量分数为1％）、农乳1602与农乳700f19质量比为1：1（质量分数为10％1、剪切速率为10，000r／min，以10℃/h的速度将反应温度升至50～60℃；NH,C1对反应体系固化温度和微囊形成率有一定影响；5d内微囊有效成分的释放速率为0．1％。【结论】10％硫氟肟醚微囊悬浮剂具有外观形态良好、平均粒径小（2—3μm）、分散性能好、包封率高以及稳定性良好等特点，表现出较好的开发应用前景。

[Aims] New insecticide HNPC-A2005 degraded quickly in the environment, and showed a short persistence. A study on the preparation and microencapsulation parameters of HNPC-A2005 microcapsule suspension was ca/Tied out in the laboratory in order to increase the control efficacy and overcome the shortcomings of quick degradation and short persistence against the pests in the crop fields. [Methods] The HNPC-A2005 10% microcapsule suspension was prepared with PAPI and ethylene diamine as wall material using inteffacial polymerization in an aqueous medium. [Results] FTIR analysis showed that the HNPC-A2005 was covered successfully with the wall material. Microencapsulation parameters was optimized as the following： ratio of PAPI and ethylene diamine was 1.5 ： 1（mass percentage 1%）, ratio of Nongru 1602 and Nongru 700 was 1 ： l（mass percentage 10%）, stirring speed was 10,000 r/min and temperature slowly increased to 50-60 ℃ with 10℃/h, NH4C1 had certain influence on reaction temperature and microcapsule formation, and release rate was 0.1% within five days. [Conclusions] The HNPC-A2005 10% microcapsule suspension had a satisfied morphology and particle size distribution （0=2-3μm）, good dispensability, high entrapment and stability, which showed potential development and application prospects.