Manufacture of microcapsules consisting of porus polymer as inside wall and ultra-thin membrane as outside wall material

本研究开发了一种原位聚合法制备微胶囊的技术。制备了两种微胶囊，一种以有机溶剂为芯材，另一种以水溶液为芯材，分别描述如下。采用原位聚合法制备了以有机液体为芯材，以异辛烷为芯材，以交联型聚苯乙烯为壁材，平均粒径为50~400m的微胶囊。将含异辛烷、苯乙烯和二乙烯基苯的聚合引发剂有机相分散在含有一定量分散剂(阿拉伯树胶)的水溶液中，通过原位聚合法制备了多孔聚苯乙烯微胶囊。考察了操作条件对颗粒尺寸、壁厚和渗透系数的影响，得到了以下结果。(1)STI-…的单体浓度和转速更多的是控制微胶囊壁厚的主要操作因素。(2)单芯和多芯微胶囊的渗透特性不同。以水溶液为芯材，以交联型聚苯乙烯为壁材，制备了平均粒径为20~250m的微胶囊。即以水、苯乙烯、二乙烯基苯等为原料制备W/O/W乳液，在分散油相中进行原位聚合，制得微胶囊。讨论了操作条件对微胶囊物理性能的影响。得到了以下结果。(1)通过该工艺制备了多核微囊。(2)微胶囊的平均尺寸取决于转速、界面活化剂(DBSNa)浓度、PVA浓度和分散体积分数。(3)微胶囊内的Ni~(2+)~(2+)在前30分钟内有明显的渗透性，之后的渗透率很小。较少

A technique of microcapsule manufacturing by in situ polymerization was developed in this research. Two kinds of microcapsules were prepared, one containing organic solvent as core material and the other containing aqueous solution as core material, as described separately below.1. Microcapsules containing organic liquid as core material Microcapsules of 50 - 400 m in average size consisting of isooctane as core material and cross-linked polystyrene as wall material were prepared by using in situ polymerization. That is, organic phase of isooctane, styrene and divinyl benzene containing polymerization initiator was dispersed in aqueous solution containing a prescribed amount of a dispersion agent (arabic gum), and a porous polystyrene microcapsule was prepared by in situ polymerization. The effects of operating conditions on particle size, wall thickness and permeability coefficient were investigated to obtain the following results. (1) Monomer concentration and rotational speed of sti … More rrer were main operating factors in controlling the wall thickness of microcapsule. (2) The permeability characteristics were different between the unit-core and multi-core microcapsules.2. Microcapsules containing aqueous solution as core material Microcapsules of 20 - 250 m in average size consisting of aqueous solution as core material and cross-linked polystyrene as wall material were prepared. That is, W/O/W emulsion from water, styrene, divinyl benzene and so on was prepared, and in situ polymerization was completed in the dispersed oil phase to obtain the microcapsules. the effect of operating conditions on the physical properties of the microcapsules was discussed. The following results were obtained. (1) Multi-core microcapsules were obtained from this procedure. (2) The average size of microcapsules depends on the rotational speeds, interface active agent (DBSNa) concentrations, PVA concentrations and dispersion volume fractions. (3) Notable permeability of Ni^<2+> from the inside of microcapsules for first 30 minutes and negligible small permeability after that time were detected. Less