An aqueous suspension of a microcapsular insecticidal composition is obtained by emulsifying a liquid pyrethroid insecticide or a hydrophobic solution comprising a pyrethroid insecticide and a high-boiling solvent, preferably an alkyl phthalate wherein the alkyl group has 8 to 13 carbon atoms, in the presence of a water-soluble anionic polymeric surfactant to obtain liquid particles having appropriate diameters and polycondensing melamine-formaldehyde or its derivative on the surfaces of the obtained particles. This composition has a prolonged stable insecticidal effect and is reduced in the toxicity against aquatic animals.
一种微胶囊杀虫组合物的
水悬浮液是在
水溶性阴离子聚合物表面活性剂的存在下,通过乳化液体拟
除虫菊酯杀虫剂或由拟
除虫菊酯杀虫剂和高沸点溶剂(最好是烷基
邻苯二甲酸酯,其中烷基有 8 至 13 个碳原子)组成的疏
水溶液,以获得具有适当直径的液体颗粒,并在获得的颗粒表面上缩聚
三聚氰胺-
甲醛或其衍
生物而得到的。这种组合物具有长期稳定的杀虫效果,并降低了对
水生动物的毒性。