摘要：最近几年来随着人们健康、保养意识的渐渐提高，个人护理产品中有越来越多的天然及有机成分被添加到其中，包括防晒产品。因为植物成分的添加可以增加防晒指数，同时可以避免化学成分的使用。现在有些新推出的面部护理化妆品就加入了各种各样抗氧化剂，这些抗氧化剂使得产品的ＳＰＦ值提高。因为化学紫外线吸收剂与物理紫外线屏蔽剂都有着较为显著的特征，但是从天然植物中得到的天然防晒物质对皮肤的刺激小，在防晒同时，还可以美白祛斑、抗衰老等作用，同时兼备防晒与营养，因此业内外人士对植物防晒剂大加关注。汉麻植物具有良好的防晒功效，可以有效的屏蔽或吸收紫外线的同时还有晒后修复等功效。本课题以汉麻粉成分为原料，经过汉麻粉的预处理和防晒功效评价，研究了汉麻粉预处理方法与防晒功效检测，为汉麻防晒产品产业化提供了试验依据。33800
毕业论文关键词：防晒化妆品；天然防晒剂；汉麻粉；酸碱处理；吸光度；防晒性能
The physical ultraviolet screening effect
of hemp powder and its application in cosmetics
Abstract: As people’s health consciousness gradually improve, more and more natural and organic ingredients are added to the personal care products, sunscreens is no exception.Because plant composition can increase the produc SPF,and chemicals is avoided using .Some new facial skin care products on the market just joined a variety of antioxidants, these antioxidants made products SPF value increase.Due to UV absorber and ultraviolet screening agent have obvious relatively characteristics, the natural sunscreens which obtain from the natural plant have little stimulation to the skin, at the sunblock same time, also have the effects like whitened and freckle removed , anti-aging, have both sunscreen and nutrition at the same time, so plants sunscreen all attractived. Hemp plant has excellent performance of sunscreen ,which can effectively block or absorb ultraviolet and repair the skin after sunburn.This subject uesed hemp powder as raw material, by the pretreatment of the hemp powder and the research of its sunscreen performance, developing the hemp powder pretreatment and sunscreen detection, provided the experimental evidences for the industrialization of hemp sunscreen.
KeyWords: sunscreens; natural sun-screening agents; hemp powder; acid and alkali treatment；absorbancy; sun-screening performance
目录
1绪论    1
1.1  皮肤的光生物损伤症状和因素    1
1.1.1  因素    1
1.1.2  症状    2
1.2  化妆品常用防晒方式    4
1.2.1  物理屏蔽    4
1.2.2  化学吸收    4
1.2.3  天然植物    4
1.3  防晒功效评价    5
1.3.1  UVA防晒评价    6
1.3.2  UVB防晒评价    6
1.4  课题研究的意义和内容    7
1.4.1  课题研究的意义    7
1.4.2  课题研究的内容    8
2实验内容    9
2.1  实验仪器与原料    9
2.1.1  实验仪器    9
2.1.2  实验原料    10
2.2  实验内容    10
2.2.1  配制酸碱液    11
2.2.2  汉麻粉的破碎处理方法    11
2.2.3  汉麻粉酸碱处理    12
2.2.3  汉麻粉洗脱    12
2.2.4  汉麻粉抽滤、烘干    12
2.2.5  汉麻粉3M胶带待测吸光度样品的配制    12
2.2.6  汉麻粉吸光度测试    13 汉麻粉的物理紫外屏蔽作用及其在化妆品中的应用:http://www.751com.cn/huaxue/lunwen_31213.html