Preparation Of Mosquito Microcapsules And Its Application In Silk Fabrics

Mosquitoes spread malaria, dengue fever and other diseases, to human health caused serious harm. Mosquito repellent fabric due to a mosquito, preventing disease transmission and other characteristics, caused widespread concern of consumers, by consumers of all ages. Compared to conventional synthetic repellent, natural repellent is safe, environmentally friendly, skin irritation, etc., the subject of natural repellents-Nepeta oil as core material, natural polymer materials, respectively chitosan sodium alginate and sodium dodecyl benzene sulfonate complex as the wall material, using a complex method of preparing cohesion safe and effective mosquito microcapsules by padding the mosquito microcapsules prepared to organize the silk fabric, giving it good repellent effect and washability.Research indicates:By examining two kinds of wall material mixed solution of complex condensed cream light transmittance and phenomena, to give chitosan and alginate complex coacervation reaction optimum volume ratio of 1.75: 1, chitosan and sodium dodecyl benzene sulfonate sodium complex cohesion optimum volume ratio of 1: 2, in this complex coacervation positive and negative charge amount under the conditions of both volume carried by just equal to colloidal form precipitates lowest transmittance,white light phenomenon strongest.In the complex emulsifier Span 80 and Tween-80 weight ratio of 2: 1, Nepeta oil mass fraction of 2%, 30% compound emulsifier mass fraction Nepeta oil, emulsified200 times, the stability of the emulsion prepared Nepeta best, an average particle diameter of about 150 nm, evenly distributed.By examining mosquito microcapsule particle size and distribution of the percentage of its morphology, to determine the optimum preparation mosquito microcapsules:(1) chitosan and alginate microcapsules for the mosquito optimum compoundwall material was prepared as follows: core wall mass fraction of 0.5%, core wall ratio of 2: 1, complex coacervation pH of 3.0, followed by stirring Speed is 600 r / min,complex coacervation reaction temperature is 40 ℃, the curing agent in an amount of2% glutaraldehyde, chitosan amount, the average particle diameter of the microcapsules produced under these conditions is about 1 ~ 2μm;(2) chitosan and sodium dodecyl benzene sulfonate as mosquito optimum complex microcapsule wall material prepared: core wall mass fraction of 1% of the core wall ratio of 2: 1, complex coacervation pH 5.0, stirring speed of 800 r / min,complex coacervation reaction temperature is 40 ℃, the curing agent in an amount of2% glutaraldehyde, chitosan amount, the average particle diameter of the microcapsules produced under these conditions is about 200 ~ 300 nm.Scanning electron microscopy mosquito microcapsules smooth spherical morphology was regular and more uniform particle size distribution, chitosan and alginate microcapsules for the mosquito compound wall material surface preparation of microporous, an average particle diameter of 1 ~ 2 μ m; chitosan and sodium dodecyl benzene sulfonate complex wall material for the preparation of microcapsules mosquito regular smooth surface, the average particle size of 200 ~ 300 nm. Outside the spectrum shows complex mosquito microcapsule wall material is mosquito microcapsule wall formed by electrostatic binding of. Spectrophotometer test prepared by UV spectrophotometry embedding rate of two mosquito microcapsules was about 55% and 80%, respectively.Repellent effect will be prepared using the padding method of mosquito microcapsule finishing on silk fabrics, the test compound chitosan and alginate microcapsules prepared mosquito finishing silk fabric is better, repellent rate of 66 %,15 times after washing, chitosan and sodium dodecyl benzene sulfonate as complex coacervation microcapsules finishing mosquito repellent fabric preparation rate of decline is not, washable better; silk fabric through the anti- After finishing mosquito microcapsules little effect on the overall style of silk.