Abstract
During atomisation, modified agricultural spray formulations can produce less fine spray (for drift control) or reduce the overall droplet size distribution (for efficacy). Motivated by the technical literature concerning antifoaming agents, emulsions with and without solid particles were studied to examine their effect on atomisation. For emulsions, the effects of oil type, oil droplet diameter, surfactant, and presence of solid particles in the oil phase on the sprayed droplet size distribution were examined. Test formulations were compared with a standard commercial formulation and several commercial low-drift adjuvants. Results indicated that large oil droplets and the presence of solid particles reduced the number of fine droplets produced in multi-phase emulsions. • Low-drift agricultural formulations minimise fine droplets narrowing size distribution. • Oil drops in a multiphase system facilitate liquid sheet breakup during atomisation. • Antifoam formulations (liquids, solids) help rupture of the thin films. • Tested antifoam materials as good as current industry low-drift standards.
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