Water in oil microemulsion aerosol systems for insecticidal compositions

摘要

Conventional aerosol as a delivery system for hydrophobic insecticides, formulated with hydrocarbon or freon type propellants ((A46) or Freon 11/12) are derived from matrices based on non-aqueous organic solvents, i.e., either hydrocarbons or halogenated hydrocarbons. Such systems pose potential environmental hazards like high flammability (hydrocarbon emission) and depletion of the ozone layer from fluorinated hydrocarbons, and emission of chlorinated hydrocarbons as cancer suspect agents. Totally aqueous systems are not easy to formulate in a single phase system as are aerosols. While O/W microeulsions are described in the literature, their use as trigger spray or aerosol systems produced low knockdown rates (speed of 'kill'). A W/O microemulsion which will accommodate high levels (>= 35percent) of conventional hydrocarbon propellant (A46) would be safer and will improve the knockdown rate.