STP1537: WG and WP Formulations of Captan with Polymeric Surfactants

    Hu, Qiang
    Research Chemist, Croda, Inc., New Castle, DE

    Pages: 20    Published: Dec 2011


    Abstract

    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 sulfosucci-nate 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.

    Keywords:

    polymeric surfactant, styrene-acrylic copolymer, formulation, dispersant, water-dispersible granule, wettable powder, suspensibility, dispersibility, morphology, light scattering


    Paper ID: STP153720120006

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP153720120006


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