Study On Preparation Of Chitosan/Amphoteric Surfactant-artemisia Oil Microcapsule

Microencapsulation is an important technology of the production offunctional powders，and in recent years it is widely used in the field of textilefinishing. Several important microencapsulation technologies were introduced.The trend and recent progress of microcapsule antibacterial reagent wassummarized. At the same time the main existent problems of microcapsuleantibacterial reagent was illuminated in textile antibacterial finishing, and theapplication prospect of microcapsulation finishing reagent in the field of textileantibacterial finishing was also briefly described.The best conditions of chitosan degradation were studied using single factorexperiment. In the basis of former study, each of the chitosan degradation factorwas analyzed significantly. Chitosan deacelation degree (DD) and intrinsicviscosity were compared. Finally the condition of chitosan degradation processwas optimized, and the best process was: chitosan content was2%, acetic acidconcentration was2.5%, hydrogen peroxide concentration was4%, reaction timewas4h. In this condition the chitosan DD was higher, viscosity was moderate,water-soluble was better, molecular weight was below ten thousand, the colorwas light.The artemisia oil emulsion was prepared by the method of InterfacialComplexes Generation with emulsifiers of DisodiumN-(2-carboxyethyl)-N-dodecyl-β-alaninate（NCNA）and Span80. The stability ofemulsion was characterized by the method of Oil-phase Centrifugal Coefficient.The effects of stirring speed；emulsifying temperature；emulsifying time；emulsifier dosage and emulsifier ratio on the stability of emulsion wereinvestigated. The results show that the optimum emulsification conditions were:stirring speed was3000r/min, emulsification temperature was60℃,emulsification time was15min, emulsifier dosage was5%, emulsifierratio(Span/NCNA) was8/2. In this condition the Oil-phase Centrifugal Coefficient was0. Meanwhile, multimedia microscope and TransmissionElectron Microscope (TEM) were used to observe the distribution andmorphology of the emulsion droplet which had a uniform distribution andsuitable for microcapsules preparation use the method of complex coacervationin the optimum emulsification conditions.The artemisia oil microcapsule antibacterial was prepared by complexcoacervation, amphoteric surfactant N-(2-carboxyethyl)-N-dodecyl-β-alaninate(NCNA) and chitosan (CS) as shell material, artemisia oil as core material. Theinfluence of each factor on distribution and speciation of microcapsule wasanalyzed systematically. The optimum preparation process of artemisia oilmicrocapsule was obtained: ratio of core/shell materials was2/1, systemconcentrations was1%, ratio of CS/NCNA was1/1, complex coacervation pHvalue was6.5, complex coacervation stirring speed was400r/min. Microcapsulations prepared in this condition had uniform dispersal, particle size lessthan10μm, regular and round appearance.Finally, microcapsule antibacterial was used finish cotton fabric, and theeffect of antibacterial was tested, the results showed that the finished cottonfabric perform good antibacterial effect on escherichia coli and staphylococcus.After washing30times, the antibacterial rate of fabric on escherichia coli andstaphylococcus was as high as80%.