硫氟肟醚微囊悬浮剂的制备及微囊化参数

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700的质量比为1∶1(质量分数为10%)、剪切速率为10,000 r/min,以10℃/h的速度将反应温度升至50~60℃;NH4Cl对反应体系固化温度和微囊形成率有一定影响;5 d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。

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

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 carried 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 interfacial 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∶1(mass percentage 10%),stirring speed was 10,000 r/min and temperature slowly increased to 50-60 °C with 10 °C/h,NH4Cl 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(?=2-3 μm),good dispensability,high entrapment and stability,which showed potential development and application prospects.