Development Of Pesticide Microcapsules And Tests For Their Effects On Health Pests

Using polymeric MDI and polyamine as wall material, an interfacial polymerization method was used to make pesticide microcapsule. Several reaction parameters to particle sizes and releasing capacity were investigated, including the effects of quantity of emulsifiers, emulsifying rate, emulsifying time, reaction time and reaction temperature. Optimum reaction conditions were confirmed. Dispersant, wetting agent, thickening agent and antifreeze were selected. The main parameters of capsule suspension were measured. The capsulate rate was 93.2% and suspensibility rate got to 63%. 2.5% chlorpyrifos & cyhalothrin capsule suspension and 2.5%cyhalothrin capsule suspension were made with the same method and reaction conditions. Their efficiency to health pets was investigated in laboratory, and the mortality rate to Culex pipiens quinque facciatus, Blattella germanica and Musca dementia vicina Macquart maintained over 90% within 90 days after the capsule suspension being sprayed. Cost of raw material of capsule suspension was just half of the cost of corresponding emulsifiable concentrates.