以生物柴油为替代溶剂制备高效氯氟氰菊酯微乳剂及其性能表征

 【目的】探讨环境相容性好的生物柴油作为替代溶剂在高效氯氟氰菊酯微乳剂制备中的应用性能,为生物柴油在农药绿色制剂加工中推广应用提供依据。【方法】利用相转移法,制备生物柴油、环己酮和0#柴油3种不同溶剂的2.5%高效氯氟氰菊酯微乳剂,比较3种不同溶剂微乳剂的相行为、对棉蚜和菜青虫幼虫毒力以及对棉苗安全性的差异。【结果】生物柴油对高效氯氟氰菊酯具有较好的溶解性能,25℃为326 g?L-1;以生物柴油为溶剂制备的微乳剂外观均一透明、低温贮存稳定,热贮稳定,原药分解率仅为2.0%;3种不同溶剂的微乳剂对棉蚜和菜青虫3龄幼虫LC50值无显著差别,对棉苗株高和叶绿素含量基本无影响。【结论】以生物柴油为溶剂能够制备出性能指标优良的高效氯氟氰菊酯微乳剂,且对有效成分活性没有拮抗作用,对棉苗安全。

Preparation of Lambda-Cyhalothrin Microemulsion with Biodiesel as Substitute Solvent and Study of Its Performance

【Objective】 The objective was to study the application of environment-friendly solvent, biodiesel as substitute solvent, in preparing the lambda-cyhalothrin microemulsion, and to provide a reference for biodiesel widely used in green pesticide preparations. 【Method】 Using phase transfer method, three 2.5% lambda-cyhalothrin microemulsions with different solvents of biodiesel, cyclohexanone and 0# diesel were prepared. The phase behavior, toxicity to Aphis gossypii Glover and larva of Pieris rapae, and the safety to cotton of the formulation with different solvents were compared. 【Result】 Biodiesel had good dissolving ability to Lambda-cyhalothrin, could reach 326 g?L-1 under 25℃. The microemulsion with biodiesel as solvent had transparent appearance, good low-temperature performance, and the decomposed ratios of active ingredients only 2.0% after 14 days storage at 54℃. The LC50 values to A. gossypii Glover and 3rd larva of P. rapae had no difference among the three formulations prepared with different solvents, and had no effect on the shoot height and total chlorophyll content of cotton seedlings. 【Conclusion】Good lambda-cyhalothrin microemulsion formulation could be prepared with biodiesel as the solvent, the biodiesel has no negative effects on the activity of active ingredients, and is comparatively safe to cotton seedlings.