Microencapsulation of vitamin E with polyurethane shell

For meeting the needs of functional finishing of skin-care textile,vitamin E(VE) core polyurethane microcapsules were successfully prepared via interfacial polymerization of polyurethane with toluene diisocyanate(TDI) and polyethylene glycol(PEG) as the prepolymer.The factors affecting microencapsulation effectiveness of VE were studied,such as chain-extending reaction temperature,molecular weight of PEG,and mass ratio of core to shell.Based on the present research,the microcapsules have a narrow particle size distribution;a high yield and appropriate effective load when they are prepared with PEG 400 as the polyol at 60 ℃ and the mass ratio of 1∶1.25.SEM and dynamic particle size analysis showed that VE microcapsules have smooth surfaces and spherical appearances with the mean particle size of 500-600 nm and particle size distribution of 260-2 000 nm,and are suitable for skin-care textile.