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[目的]优选出原位聚合法制备二甲戊灵微胶囊的较佳调酸介质,为二甲戊灵的微胶囊化提供一定的理论指导。[方法]以脲醛树脂为壁材采用原位聚合法制备了二甲戊灵微胶囊,研究了不同调酸介质对二甲戊灵微胶囊囊形及粒径的影响。[结果]5%盐酸溶液作为调酸介质形成的微胶囊囊形粗糙,产生粘连,粒径分布较宽;5%硝酸铵溶液、5%硫酸氢铵溶液作为调酸介质形成的微胶囊囊形松散,容易破裂,产生粘连,粒径分布较窄;5%氯化铵溶液作为调酸介质形的微胶囊囊形光滑致密且坚固,粒径分布较窄。[结论]调酸介质对原位聚合法制备的微胶囊囊形及粒径影响很大,选择合适的调酸介质能获得囊形致密、粒径分布窄的微胶囊。
[Objective] The optimal acid-forming medium for the preparation of pendimethalin microcapsules by in-situ polymerization was optimized, which provided some theoretical guidance for the microencapsulation of pendimethalin. [Method] The pendimethalin microcapsules were prepared by in situ polymerization using urea - formaldehyde resin as wall material. The effects of different acid - adjusting mediums on the shape and size of pendimethalin microcapsules were studied. [Result] The microcapsules formed by 5% hydrochloric acid solution as the acid-adjusting medium had a rough shape and formed conglutination with wide particle size distribution. The microcapsule capsular formed by 5% ammonium nitrate solution and 5% ammonium bisulfate solution Loose, easy to break, produce adhesions, particle size distribution is narrow; 5% ammonium chloride solution as the acid medium microcapsules capsule shape is smooth and dense, and the particle size distribution is narrow. [Conclusion] The acid-adjusting medium had a great influence on the microcapsule capsule size and particle size prepared by the in-situ polymerization method. The microcapsules with dense capsule shape and narrow particle size distribution could be obtained by selecting suitable acid-adjusting medium.