Abstract

Herbicides based formulations are conventionally used as wettable powder or as Emulsifiable concentrate. The Emulsifiable Concentrates (EC) are prepared by mixing the active content with solvents and surfactants. However, these formulations have undesirable phytotoxic effects due to hazardous solvent and are unsafe to operators during application. Thus, capsule suspension (CS) formulation is considered as an alternative to EC formulations. In this study, we report the preparation of CS formulation of herbicide oxyfluorfen by polymerizing Methylene diphenyldiisocyanate (MDI) and Ethylenediamine (EDA). Water suspensions of the oxyfluorfen microcapsules were prepared by adding anionic, nonionic, polymeric surfactants and formulation auxiliaries. The study also aimed to determine the effect of surfactant on the stability of the microcapsule suspension. It was found that the nature of surfactant influenced the properties of the formulation. The synthesized microcapsules were characterized by Scanning electron microscope (SEM), Fourier Transform Infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). The microcapsule suspensions were applied on rice crop to establish the safety and its future use instead of oxyfluorfen EC.

摘要

基于除草剂的制剂通常用作可湿性粉剂或乳油。可乳化浓缩物 (EC) 是通过将活性成分与溶剂和表面活性剂混合来制备的。然而，这些制剂由于有害溶剂而具有不希望的植物毒性作用，并且在应用期间对操作者不安全。因此，胶囊悬浮液 (CS) 制剂被认为是 EC 制剂的替代品。在这项研究中，我们报道了通过聚合亚甲基二苯基二异氰酸酯 (MDI) 和乙二胺 (EDA) 制备除草剂乙氧氟草醚的 CS 制剂。通过添加阴离子、非离子、聚合物表面活性剂和配方助剂制备乙氧氟草醚微胶囊的水悬浮液。该研究还旨在确定表面活性剂对微胶囊悬浮液稳定性的影响。发现表面活性剂的性质影响制剂的性质。通过扫描电子显微镜（SEM）、傅里叶变换红外（FTIR）光谱和热重分析（TGA）对合成的微胶囊进行了表征。将微胶囊悬浮液应用于水稻作物以确定其安全性和未来替代乙氧氟草醚乳油的用途。