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[目的]为了考察微乳剂和乳油剂型的液径(MDS)尺寸和稀释喷洒后的农药形态,使用复合乳化剂和乙酸丁酯溶剂,制备了质量分数为3.0%的高效氯氟氰菊酯微乳剂(ME)。经测试,各项性能达到国家标准。[方法]用激光光散射仪研究了不同水稀释倍数对3%高效氯氟氰菊酯微乳剂的MDS、多分散指数(PDI)和Zata电位值的影响,以2.5%高效氯氟氰菊酯乳油(EC)作为对比。[结果]研究发现MDS随不同稀释倍数稍微增大,且微乳剂的MDS小于乳油剂型。放置时间对其液径的影响显示2 h后微乳剂不同稀释倍数的液径均在100 nm以下。对2种剂型的30 mg/L稀释液,经喷施和干燥后进行扫描电镜观察。[结论]微乳剂形成棒状或块状结晶,晶体尺寸在几微米到十几微米范围;而2.5%高效氯氟氰菊酯乳油则形成树枝状结晶,晶体尺寸在50μm以上,这对药效发挥不利。
[Objective] The study aimed to investigate the size of microemulsion and emulsifiable solution (MDS) and the morphology of diluted pesticides after spraying. The microemulsion microemulsions and 3.0% Emulsion (ME). After testing, the performance of the national standard. [Method] The effects of different water dilution factors on the MDS, polydispersity index (PDI) and Zata potential of 3% lambda-cyhalothrin microemulsion were studied by laser light scattering instrument. With 2.5% lambda-cyhalothrin EC as contrast. [Result] The results showed that MDS slightly increased with different dilution times, and the MDS of microemulsion was smaller than that of cream. The effect of storage time on the liquid path showed that the liquid diameters of microemulsion with different dilution times were all less than 100 nm after 2 h. The two kinds of dosage forms of 30 mg / L diluted solution were sprayed and dried after scanning electron microscopy. [Conclusion] The microemulsion formed rod-like or block-shaped crystals with crystal size in the range of several micrometers to ten-odd micrometers. While 2.5% lambda-cyhalothrin EC formed dendritic crystals with the crystal size above 50μm, unfavorable.