The Preparation and Sustained Release of Thiamethoxam Wrapped by Urea-formaldehyde Resin
Microcapsules of neonicotinoid insecticide thiamethoxam,dinotefuran were prepared using urea-formaldehyde resin as wall material by in situ polymerization.Optimum process parameters of urea-formaldehyde resin microcapsules were obtained:The molar ratio of formaldehyde was 1.0∶1.8,emulsifying 60 min,acidified 0.5 h,curing 2 h.The encapsulating rate,drug loading and release rate were investigated by the intelligent dissolution tester,the microcapsules could be sustainably release in 18 days.Field tests showed that the amount of 90 g.ai/hm2 and 45 g.ai/hm2 had good effect on prevention and control of rice planthoppers using thiamethoxam and dinotefuran microcapsules.
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NSTL
万方数据
维普
