脲醛/硅酸钠复合制备农药微胶囊  

Pesticide Microcapsules Manufacture by Urea-formaldehyde/SiO_2

作　　者：马力[1,2] 王英爽 段文琴 赵长山[2] 

机构地区：[1]黑龙江省平山林业制药厂,哈尔滨150324 [2]东北农业大学,哈尔滨150300 [3]哈尔滨市阿城区平山林场,哈尔滨150324

出　　处：《农药》2009年第11期805-807,共3页Agrochemicals

摘　　要：以脲醛/硅酸钠复合材料包覆敌敌畏制备农药微胶囊,替代塑料插管生产森防烟剂。制备条件对胶囊尺寸和性能有影响。当脲醛预聚体与硅酸钠的质量比为50∶10,搅拌速度150～250r/min,反应温度65℃,时间为14～15h,对敌敌畏的包覆率达97.94%,所得微胶囊的有效成分含量为88.85%,微胶囊粒径为0.8～1.2mm。热贮(54±2)℃、14d,敌敌畏失重率小于0.3%,达到了生产森防烟剂的要求。Instead of plastic intubation, smoke agent applied in forest was manufactured by microcapsules, which were produced with urea-formaldehyde （UF）/sodium silicate composite materials coating dichlorvos （DDVP）. Capsule size and properties were influenced by producing conditions. Weight ratio of UF prepolymer and sodium silicate was 50：10, stirring speed was 150-250 r/min, reaction temperature was 65 ℃, reaction time was 14-15 h, with the conditions above, DDVP coating rate was 97.94%, and active component content of capsules was 88.85%, microcapsule diameter was 0.8-1.2 mm. Weight loss rate in heated storage [（54±2） ℃ for 14 days] was less than 0.3%, which is meeting the requirement of producing smoke agent.

关 键 词：脲醛/硅酸钠 微胶囊 农药 

分 类 号：TQ450.6[化学工程—农药化工]