5％啶虫脒微囊悬浮剂的研制及其对棉蚜的防治效果

目的]以聚脲为壁材,采用界面聚合法制备啶虫脒的微囊悬浮剂.方法]探讨了悬浮介质、分散剂种类及用量、芯材与壁材比例对微囊外观、微囊悬浮剂粒径、包囊率以及释放速率的影响,对微囊悬浮剂的理化性质进行了测定,并考察了产品对棉蚜的田间防治效果.结果]悬浮介质选用玉米油,聚乙烯醇4.5％为分散剂,芯材与壁材比例为5,可制得平均粒径为3～5 μm包囊率在90％以上分布均匀、性能稳定的微囊悬浮剂.该产品15ga.i./hm2对棉蚜7d的防效为92.90％,而20％啶虫脒SL相同剂量的防效为86.76％; 15d时二者的防效分别为87.42％、65.35％.结论]由以上方法所制得的微胶囊可明显延长棉蚜的防治效果.

Preparation of Acetamiprid 5% CS and Control Efficacy on Cotton Aphid

Microcapsules containing acetamiprid were prepared via the interfacial polymerization method using polyurea as wall materials.Methods] The effect of suspending medium,type and the amount of dispersants and C/W on the exterior features,particles size,encapsulation rate and the release rate of the microcapsule were analyzed.The physical properties of the CS and the efficiency on the cotton aphid were also studied.Results] The optimal conditions were as follows: corn oil as solvent,the dosage of PVA and C/W ...