摘要
[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3~5μm包囊率在90%以上分布均匀、性能稳定的微囊悬浮剂。该产品15 g a.i./hm2对棉蚜7 d的防效为92.90%,而20%啶虫脒SL相同剂量的防效为86.76%;15 d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。
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 were 4.5% and 5 respectively.The microcapsules showed satisfied surface morphology and particle size distribution,with the mean particle diameter of 3-5 μm.The product displayed good stability and its encapsulation rate were 90%.The field trials showed when the treated dose was 15 g a.i./ha,the efficiency of the acetamiprid 5% CS on the cotton aphid was still 92.90% 7 days after treatment;meanwhile,while the efficiency of the acetamiprid 20% SL was 86.76%.The efficiencies of the two on the cotton aphid were 87.42 and 65.35% respectively 15 days after treatment.[Conclusions] The microcapsules obtained by the above method could prolong the control efficiency on cotton aphid.
出处
《农药》
CAS
北大核心
2011年第12期880-883,共4页
Agrochemicals
关键词
界面聚合
聚脲
啶虫脒
微囊悬浮剂
防效
interfacial polymerization
polyurethane
acetamiprid
CS
control efficacy
