| 摘要 |
<p>The invention provides a process for encapsulating a mixture of propoxur, tetramethrin, piperonyl butoxide, N-octyl-bicycloheptene-dicarboximide (MGK) and essential oil of lemon (laygon) in a micro-capsular formulation comprising providing a first solution of water and polyvinyl alcohol (PVA) and heating to about 50-60 DEG C, providing a second organic solution comprising a mixture of melted laygon and an isocyanage, emulsifying the second mixture in the first mixture, adding an aqueous solution of a polyfunctional amine with agitation to the emulsion the solution containing about 10 % - 40 % of the stoichiometric amount by weight of amine necessary to fully react with the isocyanate, adding an oxyethylated monooleate sorbate emulsifier to prevent coagulation of the reaction mixture, adding the remaining polyfunctional amine solution over a period of between 5 to 10 minutes, reducing the temperature of the reaction mixture to about 20 DEG - 40 DEG CO, and adding a weak polyfunctional acid to neutralize the solution to a pH of about 7.0-8.0.</p> |
