摘要：本课题主要研究了与汉麻粉复配的天然防晒剂的防晒性能，选取了苦荞黄酮、芦丁以及黄芩苷作为主要研究对象，分别研究了这几种天然防晒剂在乙醇、多元醇以及常用化妆品原料中的溶解性，同时考察了乳化剂等化合物对其溶解性的影响。通过实验选定乙二醇作为统一溶剂溶解样品，运用3M胶带法和溶液法两种不同方法测试这几种天然防晒剂的吸光度值，最后考察了pH值对体系的紫外吸收性能以及稳定性的影响。实验结果表明，36983
苦荞黄酮、芦丁和黄芩苷在220nm都会有主要吸收峰的出现，溶液法测得的吸光度值高于3M胶带法，同时在质量分数为5%—20%之间，随着质量分数的增大，这几种天然防晒剂溶液的吸光度值也增大。而pH对体系的稳定性影响不是很大，但是不同酸或碱调到同一pH值时对体系的紫外吸收性能影响不相同，同一种酸或碱调不同的pH值是对体系的紫外吸收性能影响也不相同。
毕业论文关键词： 天然防晒剂；溶解；紫外吸收性能；稳定性
Natural sunscreen complex with hemp powder to prevent bask in Sun-screening performance research
Abstract：In this study, we research the natural sunscreen complex with hemp powder to prevent bask in Sun-screening performance ,and selected the buckwheat flavonoids, rutin and baicalin as the main research object..Respectively, to study the solubility of natural sunscreen in ethanol, polyols and commonly used cosmetic ingredients,also studied the effects of chemical compounds such as emulsifier and investigates on its solubility.Ethylene glycol as a unified solvent dissolving the sample is selected via experiment, using the 3 m adhesive tape method and solution method as two different methods to test the absorbance values of several natural sunscreen, finally investigate the effect of pH value about ultraviolet absorption performance and stability of the system.The experimental results show that the buckwheat flavonoids, rutin and baicalin will appear the main absorption peak at 220 nm,the absorbance value which through the solution method is larger 3 m adhesive tape method .While the mass fraction of the natural sunscreen between 5% -20%,with the increase of mass fraction, the absorbance values of the natural sunscreen solution also increased.And the effect of pH on the stability of the system is not very big, but different absorption properties of acid or alkali in the solution which is set to the same pH value,have different influence on ultraviolet absorption performance.With same kind of acid or alkali in the solution which is set to different pH values also have different influence on ultraviolet absorption performance.
KeyWords: Natural sunscreen; Dissolve; Ultraviolet absorption performance; stability
目录
1绪论    1
1.1 本课题国内外研究现状概述    1
1.2 欧洲防晒化妆品趋势    2
1.3 中国防晒化妆品趋势    2
1.4 常用防晒剂    3
1.5 天然防晒剂    3
1.6 本课题的研究目的和意义    5
2实验部分    6
2.1 实验原料与设备    6
2.1.1 实验原料    6
2.1.2 实验所用设备    6
2.2 实验方法    7
2.2.1  溶剂筛选方法    7
2.2.2 溶液的配制    7
2.2.3 3M胶带法测吸光度    8
2.2.4溶液法测吸光度    9
3 实验结果与讨论    10
3.1天然防晒剂溶剂的筛选    10
3.1.1黄酮    10
3.1.2芦丁    11
3.1.3黄芩苷    11
3.2几种天然防晒剂防晒性能研究    13
3.2.1苦荞黄酮防晒性能研究    13 汉麻粉与天然防晒剂的复配及其防晒性研究:http://www.youerw.com/huaxue/lunwen_35489.html