Volume 8, Issue 3 (March 2011)
WG and WP Formulations of Captan with Polymeric Surfactants
Water-dispersible Granules (WGs) and Wettable Powder (WP) are two important types of agrochemical formulations. The combined shares of WG and WP formulations by volume were 30 % among all the agrochemical formulation types in 2007. WG formulation is continuously increasing in share as a safer and greener formulation type. Both formulation compositions and formulation process affect the performance of WG and WP. This research demonstrated a concise and systematic approach to develop WG via low pressure extrusion process and WP blade-mixer blending process in the laboratory. Specifically, Captan technical as a model active ingredient was formulated together with polymeric dispersants, alkyl sodium sulfosuccinate wetting agents, and Kaolin clay diluents under controlled process conditions. The formulated samples were investigated in suspension stability, disintegration behavior, particle size, and granule morphology, and their composition-structure-performance relationships were discussed.