Preparation of olive oil-polyurethane microcapsules by interfacial polymerization

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 3-5 μm and a narrow particle size distribution;and the sustained release of the microcapsules made by PEG 600 is better than that by PEG 800.