Group Leader, BASF Corporation, Wyandotte, MI
Technical Specialist, BASF Corporation, Wyandotte, MI
Market Development Specialist, BASF Corporation, Parsippany, NJ
Pages: 12 Published: Jan 1993
Water-based formulations for liquid actives are relatively new to the agricultural market. Surfactant combinations have been identified which provide long-term stability and good dilution characteristics in concentrated emulsions (oil-in-water emulsions [EW]) and suspoemulsions (combinations of a liquid and solid active in a water-based formulation). For EW formulations, surfactant combinations consist of two nonionic EO/PO block copolymers. One has relatively hydrophobic character containing little EO and acts as emulsifier, while a relatively hydrophilic component with a large EO content facilitates dispersion in water. Suspoemulsions are stabilized by adding block copolymers containing 30 to 50% EO to commercial flowables. Some formulations require additional polyacrylate polymer as dispersant. These stable formulations are made without any thickeners or other stabilizers.
EW formulations have been demonstrated with pyrethroids and 2,4-dichlorophenoxyacetic acid. Combinations of malathion/carbaryl and metolachlor/atrazine have been successfully formulated in suspoemulsions. The physical stability and dilution characteristics of the formulations are described.
emulsions, suspension concentrates, dispersion, block copolymers, pyrethroids
Paper ID: STP20188S