期刊
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
卷 44, 期 3, 页码 475-486出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2021.1951285
关键词
Polyurea; microcapsules; stability study; dispersant; release study
This study reports the preparation of capsule suspension formulation for the herbicide oxyfluorfen and investigates the effect of surfactants on the stability of the formulation. The study found that the nature of surfactant influences the properties of the formulation. The synthesized microcapsules were characterized and tested on rice crop, demonstrating their safety and potential as an alternative to oxyfluorfen EC.
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.
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