Study On The Preparation Of Temperature-Controlled And Slow-Releasing Aromatic Microcapsules And Its Application In Fabrics

The suitable aromatic odor has the effects of regulating emotions and delighting the physical and psychological.However,the common fragrance has the problem of being volatile and having a short fragrance retention time.The microencapsulation enhances the slow release effect of the fragrance to a certain extent,however,due to the limitations of the fragrance and the wall material,the traditional fragrance microcapsules still have the problems such as fast aroma release rate,short retention time and high production cost.In view of the above problems,the solid-liquid phase change material and the fragrance together constitute a core material,and the release rate of the liquid fragrance is further regulated by temperature change,so as to prepare a temperaturecontrolled and slow-release aromatic microcapsule with long-term sustained release effect.The research work of this thesis consists of three parts:(1)With the lavender essence as the fragrance material and MMA as the wall material monomer,based on the type and amount of the preferred fragrance blocking agent,the thermostatic sustained-release fragrant microcapsules were prepared by in-situ polymerization,and the preparation process of fragrance microcapsules was optimized by adjusting the type and amount of emulsifier,the type and amount of initiator,the emulsification rate,the emulsification time and the feeding mass ratio of core to wall.(2)The particle size,surface morphology,thermal properties,chemical composition and fragrant release properties of the thermostatic sustained-release fragrant microcapsules were characterized and analyzed by laser particle size analyzer,scanning electron microscopy,thermogravimetric analyzer,differential scanning calorimeter,Fourier transform infrared spectrometer and ultraviolet-visible spectrophotometer.(3)The fragrant cotton fabric and the fragrant non-woven fabric were prepared by padding and dipping processes,and the effects of fragrance retention and soap fastness of fragrant fabrics and the effect of aromatic finishing on fabric wearing performance were studied.The research results show that:(1)The optimized synthesis conditions of thermostatic sustained-release fragrant microcapsules are as follows: n-hexadecane is used as the fragrance sealer,the mass ratio of sealant to flavor is 7:3,the feeding mass ratio of core to wall is 1:1,SDS as emulsifier of 4% of the oil phase mass,AIVN as initiator of 1% of monomer mass,the emulsification rate is 24000 r/min and the emulsification time is 20 min.(2)The microcapsules have spherical or ellipsoidal shape with an average particle size of 300 nm in uniform particle size distribution,the related encapsulation efficiency reaches 85.7%,with high thermal stability,and the glass transition temperature is 88.5 ?.The wall material and the n-hexadecane in core material all inhibit the volatilization of the fragrance.The microcapsules still have 45%,29% and 27% residual lavender fragrance under 15 ?,25? and 35 ? conditions after 90 days,resulting that good thermostatic sustained-release property was obtained.(3)Fragrance fabrics have good fragrance retention properties.Among them,the fragrance cotton fabric is soaped 10 times,placed under natural conditions for 90 days,and the fragrance non-woven fabric is left at 70 ° C for 42 days,leaving fragrance.Fragrance finishing has almost no effect on cotton fabric feel,moisture permeability and color,but has a certain influence on gas permeability.