茉莉香精微胶囊的制备及其热稳定性研究

Preparation of jasmine fragrance microcapsules and its thermal stability

以蜜胺树脂为壁材,运用原位聚合法制备茉莉香精微胶囊并研究其热稳定性.结果表明:降低芯壁比可以得到热稳定性较好的微胶囊,但其形貌相对较差;降低预聚体的滴加速度可以得到形貌较好的微胶囊,并进一步改善其热稳定性;芯壁比为1∶1,预聚体滴加速度为0.6 mL/min时,微胶囊具有较好的热稳定性和形貌;加入足量的尿素可以降低微胶囊的游离甲醛含量.

Jasmine fragrance microcapsules were prepared by in-situ polymerization using formaldehyde-melamine resin as wall material and the thermal stability was further studied. The results showed that reducing the ratio of core and shell could improve the thermal stability of microcapsule, however worsen the morphology of microcapsules. Slewing down the prepolymer dropping rate could get both good thermal stability and morphology. The optimum conditions for jasmine microcapsule with good thermal stability and morphology were defined as 1 ： 1 of ratio of core and shell ratio, 0.6 mL/min of prepolymer dropping rate. The addition of fulldese urea could decrease the free formaldehyde amount of microcapsules.