原位聚合法制备香精微胶囊及其在香味纸中的应用

Preparation of Fragrance Microcapsules by In-situ Polymerization and Its Application in Fragrance Paper

关键词:  香精微胶囊  原位聚合法  香味纸

Key Words:fragrance microcapsule  in-situ polymerization method  fragrance paper

摘要:本研究以三聚氰胺甲醛（MF）树脂为壁材，柠檬香精油为芯材，苯乙烯-马来酸酐共聚物（SMA）为乳化剂，通过原位聚合法制备香精微胶囊，并将香精微胶囊添加到纸浆中抄造成香味纸，研究了pH值、SMA用量对香精微胶囊合成工艺的影响，并采用光学显微镜、场发射电子扫描显微镜（FESEM）、激光粒度分布分析仪、傅立叶变换红外光谱仪（FT-IR）对香精微胶囊进行了表征。结果表明，当pH值5、SMA用量2%（相对于芯材质量）时，制备的香精微胶囊分散性较好。香精微胶囊呈球状，具有核壳结构，平均粒径13.75 μm。通过对香味纸性能实验测定表明，香味纸在70℃以下具有较长的留香时间。70℃条件下，当香精微胶囊用量从3%增加到9%时，留香时间从12.0 h增加到17.0 h。此外，香精微胶囊的添加增加了香味纸的白度，但使香味纸的抗张强度有所下降。当香精微胶囊的用量从0增加到9%时，香味纸的白度从82.0%增加到83.6%，而抗张强度从2.75 kN/m下降到1.75 kN/m。

Abstract:In this study， the fragrance microcapsules were prepared by in-situ polymerization with melamine formaldehyde resin （MF） as the wall material， lemon flavor oil as the core material， and styrene-maleic anhydride copolymer （SMA） as the emulsifier， and fragrance paper was made by adding fragrance microcapsules to pulp. The effects of pH value and SMA dosage on the synthesis process of fragrance microcapsules were studied. The results showed that the dispersion of the microcapsules was in a good state when the pH value was 5 and the SMA dosage was 2%. The fragrance microcapsules were characterized by optical microscope， field emission electron scanning microscope （FESEM）， laser particle size distribution analyzer， and Fourier infrared spectroscopy （FT-IR）. The results showed that the microcapsules were spherical and had a core-shell structure， with an average particle size of 13.75 μm. Through the performance test of the fragrance paper， the results showed that the fragrance paper had a long fragrance retention time below 70℃. When the content of the fragrance microcapsules increased from 3% to 9%， the fragrance retention time increased from 12.0 h to 17.0 h. In addition， the addition of fragrance microcapsules increased the whiteness of the fragrance paper， but reduced the tensile strength of the fragrance paper. When the content of fragrance microcapsules increased from 0 to 9%， the whiteness of the fragrance paper increased from 82.0% to 83.6%， while the tensile strength decreases from 2.75 kN/m to 1.75 kN/m.