Low Breakage and Size-controlled Preparation of NiCl2 Immobilized Hollow Polyurea Microcapsules

Polyurea microcapsules containing NiCl2 were prepared by interracial polymerization between diisocyanate and water with triethylamine as a catalyst in water-in-oil emulsion system. The influence of preparation conditions such as the dosage and feed mode of the catalyst, concentration of the encapsulated NiCl2, and concentration and structure of diisocyanates on the breakage of the microcapsules have been evaluated. The results show thatbreakage is strongly dependent on the rate of polymerization and stability of initial emulsion. The improved microcapsules with low breakage have been produced under the optimum conditions. Furthermore, the obtained microcapsules capsules immobilizing NiCl2 as a recyclable catalyst is successfully used in benzaldehyde reduction.

包含 NiCl2 的 Polyurea 微囊被在 diisocy-anate 和水 witii triethylamine 之间的界面聚合在 water-in-oil 乳剂系统作为催化剂准备。象剂量那样的准备条件的影响并且喂模式死微囊的破裂上的 diisocyanates 的催化剂，包含的 NiCl2 的集中，和集中和结构被评估了。结果证明那破裂强烈依赖于起始的乳剂的聚合速率和稳定性。有低破裂的改进的微囊在最佳条件下面被生产了。而且，死作为 recyclable 催化剂使 NiCl2 不能调动的获得的微囊成功地在对二丙胺基苯醛被使用减小。