防晒霜的紫外光谱分析及防护持久性评估

Spectral analysis and durability evaluation of sunscreen cosmetics

采用光谱分析法,定量研究了各类防晒霜的防晒性能,覆盖UVA和UVB 2个波段,从物理防晒和化学防晒两方面研究其相关机制及防晒效果,并对防晒霜进行紫外照射,通过测量样品反射率及透射率研究其防晒效果随时间的变化.实验表明:所测样品的防晒机制均以物理防晒为主、化学防晒为辅,且不同防晒霜样品防护能力变化率均存在突变点,大多对UVB具有较强的防护作用.实验也表明光谱分析是判断防晒的防晒效果的有效方法.

For quantitative and qualitative analysis of all kinds of sunscreen cosmetics'perform‐ance ,based on the spectral analysis method ,cover UVA and UVB band ,from physical and chemical aspects ,the mechanism and effect of sunscreen cosmetics were discussed .By irradiating the sunscreen cosmetics with UV irradiation ,the durability of the sunscreen cosmetics was also evaluated .Experi‐mental results showed that chemical mechanism was subordinate to physical mechanism ,and the decay rate of the performance of all the different sunscreen cosmetics had point of abrupt change .Most sam‐ples had strong protective effect in the UVB band .The experimental results also showed that spectral analysis was an effective method to access the performance of sunscreen cosmetics.