- 學位論文
以聚合縮合法製備包覆香精油之三聚氫胺甲醛樹酯微膠囊
Preparation of Melamine-Formaldehyde Resin Microcapsules Containing Fragrant Oil by Condensation Polymerization
摘要
微膠囊具有防止包覆物質揮發、延長其釋放時間以及提高其儲存的穩定性等功能。由於香精油的揮發性相當高，很適合以膠囊化的方式處理後再供進一步的應用。本研究以三聚氰胺和甲醛為壁材，香精油為芯材，使用縮合聚合法製備出香精油微膠囊。研究的目的在製備出粒徑分佈窄且包覆率高的香精油微膠囊。探討的主要變因包括有：溫度、攪拌速率、精油重量比、乳化劑的種類以及乳化劑重量比。由實驗結果得知，微膠囊的平均粒徑會隨著攪拌速率的提升或精油添加量的減少而遞減。其次，由統計軟體Design-Expert 5分析的結果得知，影響微膠囊粒徑的主要因素依其影響程度的大小排列為：乳化劑重量比＞精油重量比＞＞攪拌速率＞溫度，而影響微膠囊包覆率的主要因素依其影響程度的大小排列為：乳化劑重量比＞精油重量比＞＞溫度≒攪拌速率。
並列摘要
Microcapsules can prevent the wrapped core materials from evaporating, extend the releasing time and stabilize the core materials during storage. Since fragrant oil has high evaporation property, it is very suitable to be treated by microencapsulation for further applications. In this study, we used melamine and formaldehyde as the shell materials with fragrant oil as the core materials to prepare microcapsules by condensation polymerization method. The purpose of this research is to synthesize the microcapsules containing fragrant oil with narrow size distribution and high capacity. Six factors considered in our experiments include temperature, stirring rate, the mass ratio of fragrant oil, the kinds of emulsifiers, and the mass ratio of emulsifier. It was found that, the higher the stirring rate or the lower the mass ratio of fragrant oil, the smaller the average diameter of microcapsules. In addition, by employing the software of Design-Expert 5 to analyze the experimental data, it was concluded that the degree of the effect of the factors on the particle size of microcapsules follows the order of the mass ratio of emulsifier > the mass ratio of fragrant oil >> stirring rate > temperature, and that on the encapsulating efficiency of microcapsules follows the order of the mass ratio of emulsifier > the mass ratio of fragrant oil >>temperature≒stirring rate.