Study On The Preparation Of Vitamin E Microcapsules And Its Application On Silk Textiles

This paper selected two kinds of commercially available VE microcapsules asthe finishing agent of skin-care silk fabric, separately with Arabia rubber (DC) andmodified starch (CWS) as the wall materials. Through comparison of fabric softproperty, VE microcapsules with CWS shell stood out. And then, the paper studiedand drew a reasonable silk fabric VE microcapsule skin-care finishing process andformula as following. VE microcapsules with CWS shell of30~50g/L, adhesive101of50~60g/L, softener CGF for30g/L, pre-drying condition of80℃/1min, and bakingcondition of130~140℃/40S. The results show that VE microcapsules with CWSshell has a moderate size and good dispersing performance in water, the averageparticle size of emulsion of380.6nm. The finishing process has no effect basically onthe fabric whiteness and handle, and VE relative remaining percent content of thefinished fabric is more than80%after washing for16times. Through impregnated for10h in the room temperature, the finished fabric doesn’t release VE, and then theimpregnation temperature is increased to40℃, which releases VE by2~3%. TheVE-releasing property of the finished fabrics needs to be further improved.Polyurethane (PU) materials have been widely applied in the sustained-releasemicrocapsules preparation. To improve VE-releasing property, the paper has preparedVE microcapsules with PU shell. The reseach results suggest that the emulsifyingperformance is best that the average particle diameter of emulsion get79.3nm withouthigh shear when we adopt oil phase method to emulsify VE acetate with Tween80asthe emulsifier in a dosage of3%. Monomer PEG molecular weight has a significantimpact on the microcapsule particle size and dispersion property, and microcapsuleshave a small particle size and good dispersibility with PEG400as a reaction monomer.The prepolymerization reaction temperature should not be too high in order to reduceside reactions, which is kept at50℃. Microcapsules have not only the advantages of small particle size and narrow distribution range, but also high microencapsulationyield and proper effective load with the chain extender temperature of60℃, thecore-wall mass ratio of1:1.25and two-steps synthetic route.The homemade VE microcapsules with PU shell, prepared on the basis of theabove-mentioned process, show a regular globular and have a particle size distributionof0.26~2μm and average size of0.582μm. FESEM pictures show that VEmicrocapsules adhere well to fibers by the optimizing finishing process. FTIRanalysis indicates that PU structure exists in VE microcapsules. Compared with thefabric finished by VE microcapsules with CWS shell, the one finished by VEmicrocapsules with PU shell has a lower wash fastness but its core VE is easy to bereleased. After impregnated for10h at40℃, the finished fabric releases VE by7~8%.