聚脲薄荷香味微胶囊的制备及其耐热留香性能测试

Preparation and heat-treated fragrance retention performance test of microencapsulated dementholized peppermint oil with polyurea Shell

分别采用己二胺(HMDA)、二乙烯三胺(DETA)、三乙烯四胺(TETA)和四乙烯五胺(TEPA)为胺类单体,制备了4种聚脲薄荷香味微胶囊,利用扫描电子显微镜和激光粒度仪分析了其表观形貌与粒径分布。采用耐热稳定性、耐热致密性和加香面料的香气浓郁度评估了4种薄荷微胶囊的耐热留香性能,并比较了3种测试方法的差异。实验结果表明,所制备的微胶囊均呈规整的球状且粒径分布相对集中,采用四乙烯五胺(TEPA)TEPA制备的香味微胶囊具有最佳的耐热留香性能。对于香味微胶囊的耐热留香性能评估,可以采用耐热稳定性和耐热致密性作为初步的量化评估方式,加香面料的香气浓郁度评估可以作为补充评价方法来评判其实际耐热留香效果。

The hexamethylenediamine(HMDA),diethylenetriamine(DETA),triethylenetetramine(TETA)and tetraethylenepentamine(TEPA)were used to prepare four kinds of microencapsulated dementholized peppermint oil with polyurea shell.The morphology and size distribution of the microcapsules were analyzed by scanning electron microscope and particle size analyzer.The heat-treated fragrance retention performance was evaluated by three methods including thermal stability,thermal compactness and aroma intensity of aromatic fabrics,and the differences of these three methods were also discussed.The experimental results indicated that all the microcapsules showed regularly spherical shape with a narrow particle size distribution.The microcapsule synthesized by TEPA exhibited the best heattreated fragrance retention performance.As for the heat-treated fragrance retention performance,thermal stability and thermal compactness tests could be used as the preliminary quantitative evaluation methods,and the evaluation onaroma intensity of aromatic fabrics could be ysed as a type of supplementary evaluation method to confirm the practical fragrance retention performance after heat treatment.