摘要
采用界面聚合法研究了多种囊壳单体及不同配比对辛硫磷微胶囊成囊的影响,其中以占油相5%的N1单体与2.5%的S1单体聚合所得的微胶囊理化性能较为稳定,54℃热贮14d有效成分分解率仅为5.4%。选定了制剂适宜的分散剂F和稳定剂H,成功地研制出理化性能高度稳定的35%辛硫磷微胶囊悬浮剂小样。该小样具有较好的控制释放性能,水中24、120h释放率分别为24.9%和44.8%。田间药效试验表明此小样对甘薯茎线虫病持效期明显比乳油长,药后180d的防效为81.5%,远高于乳油的63.2%;对甘薯的增产效果比乳油高21%。
Research was conducted, using an interfacial polymerization method, on the influence of different capsule shell monomers and their rate ratios on phoxim microcapsule formation. The most stable chemical and physical properties were obtained with microcapsules made from the N1 and S1 monomers at 5 and 2.5%, respectively, of the organic phase. These microcapsules showed only 5.4% breakdown of active ingredient after 14 d at 54°C. After selecting an appropriate dispersing agent, F, and a stability agent, H, a small sample of phoxim 35% microcapsule suspension concentrate with good chemical and physical properties was successfully produced. The sample exhibited relatively good controlled release, with 24.9 and 44.8% released after 24 and 120 h, respectively, in water. In field experiments, the sample showed significantly longer residual efficacy than did an emulsifiable concentrate in control- ling stem nematode disease of sweet potato (caused by Ditylenchus destructor), providing 81.5% control 180 days after application which far exceeded the 63.2% provided by the emulsifiable concentrate. Sweet potato yield increase was 21% higher with the microcapsule compared to the emulsifiable formulation.
出处
《农药》
CAS
北大核心
2005年第7期306-308,共3页
Agrochemicals
关键词
辛硫磷
微胶囊
界面聚合法
悬浮剂
甘薯茎线虫
phoxim, microcapsule, interfacial polymerization, suspension concentrate, sweet potato stem nematode (Ditylenchus destructor)
