STP1183: Pyrethroid Microemulsions

    Rebmann, V
    Laboratory Manager and Research & Development Manager, Witco S. A., Saint Pierre lès Elbeuf,

    Fiquet, L
    Laboratory Manager and Research & Development Manager, Witco S. A., Saint Pierre lès Elbeuf,

    Pages: 15    Published: Jan 1993


    Abstract

    A system containing a polyarylphenolethoxylate as the nonionic surfactant, and a calcium dodecylbenzenesulfonate in alcohol as the anionic surfactant and co-surfactant respectively, was used to study microemulsions of Permethrin and Cypermethrin (common insecticides of the important Pyrethroids class).

    The influence of co-surfactant chain length was investigated employing phase diagrams. The results obtained with this pseudo-quaternary system of technical products are compared with those found for more basic systems and theoretical studies predicting a strong influence of slight co-surfactant chain length reduction.

    Besides providing a good understanding of the phase behavior, phase diagrams offer a complete picture of the different microemulsions likely to be formulated with the described system, thus offering a large choice of formulations meeting specific application requirements. An example of such an approach is given, with the optimization of both 10 and 25 % Permethrin microemulsions.

    Keywords:

    Permethrin, Cypermethrin, microemulsion, phase diagram, surfactant, co-surfactant, formulation


    Paper ID: STP25122S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP25122S


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