摘要：分别以乙醇、丙醇、丁醇、丙酮作助表面活性剂，吐温-80为表面活性剂，通过Shah法制备薄荷精油微乳液，绘制拟三相图，比较单相区大小，确定最佳的助表面活性剂。实验结果发现，在乙醇与精油质量比为3:1情况下，以乙醇为助表面活性剂组分拟三相图的无限稀释区最大。说明乙醇为助表面活性剂时，微乳液精油溶解量最大，乙醇为最佳助表面活性剂。当油相成分为乙醇与精油的质量比为1:1及3:1时，对所得体系进行流变性测量，绘制剪切速率-剪切粘度曲线图，讨论微乳化处理对薄荷精油粘度的影响。流变实验结果表明，所测量体系均为牛顿流体，粘度随表面活性剂的增加而增加；随着水含量的增加，体系的粘度呈现先增大后减小的趋势。77572

毕业论文关键词：微乳液；薄荷精油；助表面活性剂；粒径；粘度

Effect of Microemulsification on Viscosity of Mint Oil

Abstract：The microemulsion of mint essential oil was prepared by using ethanol, propanol, butanol, acetone as cosurfactant and Tween-80 as surfactants respectively。 The three-phase plot was drawn and compared with single phase plot, to determine the best choice for formula to help surfactants。 The experimental results showed that the infinite dilution zone of the three-phase diagram of ethanol as the co-surfactant was the largest in the case of ethanol-oil ratio being 3:1, indicating that the concentration of ethanol in the microemulsion is the largest。 The viscosity of the oil phase was determined by the viscosity of the oil phase ratio of 1:1 and 3:1。 The shear rate-shear viscosity curve was plotted to discuss the effect of microemulsion on the viscosity of mint essential oil。 It was found that the viscosity of the system rising with surfactant, and the viscosity of the system increased firstly and then decreased with the increase of water content。 

KeyWords: microemulsion; mint essential oil; cosurfactant; particle size; viscosity

目  录

1 引言 1

1。1 薄荷精油 1

1。1。1 薄荷精油简介 1

1。1。2 薄荷精油制备工艺 1

1。1。3 薄荷精油的研究 2

1。2 微乳液 2

1。2。1 微乳液简介 2

1。2。2 微乳液制备工艺 2

1。2。3 微乳液、乳液 3

1。2。4 表面活性剂与助表面活性剂选择 3

1。2。5 微乳液的研究与应用 3

1。3流变测量 4

1。3。1 毛细管粘度计 4

1。3。2 旋转粘度计 5

1。3。3 流变仪 5

2 实验部分 6

2。1 材料与仪器 6

2。1。1 试剂与材料 6

2。1。2 实验仪器 6

2。2 实验方法 6

2。2。1 拟三相图绘制与配方确定 6

2。2。2 粘度流变实验 7

3 结果与讨论 8

3。1拟三相图绘制与配方确定 8

3。1。1 外观特征 8

3。1。2 拟三相图