Interactive surface chemistry studies of methodyl ester adjuvants and selected targets yeld a new methodology to guide formulators

摘要

Adjuvants formulation has progrressed in an Edisonian fashion. Few guidelines exist to determine which surfactants and solvents should be combined to give a high performance adjuvant. Surface chemistry ahas a pronounced effect on the adjuvant's delivery of active via wetting and spereading, and emulsion stability upon dilution of the concentrated adjuvant. The surface chemical properties of the filiage substrate also have an effect on delviery. Certain surfactants interact synergistically to improve wetting and emulsion stability. This paper presents surface chemical data on methyl ester adjuvants and surfactants. The data has been obtained through the use of advanced testing methods such as the Owens-Wendt analysis and the Beta (beta )-parameter technique. This information can be used to guide formulation in a quantitative fashion to make better adjuvant concentrates yeidling more efficacious results. Instead of randomly selecting surfacetants, ones that interact synergistically (verified through beta -parameter calculation and simple surface chemical experimentation) can be utested. Surfactants that interact antagonistically should not be tested. Also, surfactants with the requisite total, polar and dispersive surface energies realtive to the substrate are selected for early evaluation.