基于界面聚合法的橄榄油聚氨酯微胶囊制备

Preparation of olive oil-polyurethane microcapsules by interfacial polymerization

为了应用微胶囊技术赋予纺织品护肤功能,采用界面聚合法,以甲苯-2,4-二异氰酸酯（TDI）和聚乙二醇（PEG）为反应单体,非离子表面活性剂为乳化剂,制备了以橄榄油为芯材、聚氨酯为壁材的护肤微胶囊。探讨乳化剂种类、界面聚合温度、搅拌转速和聚乙二醇分子质量等因素对微胶囊形成的影响。用粒度仪和生物显微镜分析不同乳化剂对橄榄油的乳化效果。结果表明,由吐温80和聚乙烯醇混合所乳化而成的橄榄油乳化体系受温度变化影响小,稳定性好。扫描电镜分析表明,以混合乳化剂制备的微胶囊平均粒径在3~5μm左右,粒径分布范围窄,颗粒大小较均匀,形状较规整;以聚乙二醇600制备的微胶囊较以聚乙二醇800制备的微胶囊多孔性好,囊芯橄榄油较易释出。

To impart the function of ＂skin care＂ to textiles by using microcapsules technology, ＂skin care＂ microcapsules with olive oil as core and polyurethane as shell were prepared by interfacial polymerization with toluene-2,4-diisocyanate （TDI） and polyethylene glycol （PEG） as monomers and nonionic surfactants as emulsifier in the emulsion system. The processing factors affecting microcapsules formation, such as emulsifier type, temperature, stirring speed, and the molecular weight of PEG, were investigated. The emulsification of different emulsifiers on olive oil was evaluated by laser particle analysis and bio-microscopy analysis. The mixed emulsifier of Tween 80 and PVA is a good emulsifier, able to impart the olive oil emulsion system stability to temperature changes. Also, SEM analysis showed that the microcapsules prepared by the mixed emulsifier are uniform, with an average particle size of 3 - 5um and a narrow particle size distribution; and the sustained release of the microcapsules made by PEG 600 is better than that by PEG 800.