Chen Yuyan, Xu Hanwen, Liu Yuhang, Fu Qiuting, Zhang Pingling, Zhou Jie, Dong Hongyu, Yan Xiaodong
Research & Innovation Center, Proya Cosmetics Co., Ltd., Hangzhou 310023, China.
Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Material Engineering, Jiangnan University, Wuxi 214122, China.
Polymers (Basel). 2024 Nov 27;16(23):3317. doi: 10.3390/polym16233317.
Film-forming agents are key ingredients in achieving long-lasting and effective sun protection by sunscreens. However, studies on the synergistic effects of film-forming agents with different properties as well as the interaction between film-forming agents and powders are scarce, restricting the development of sunscreens with strong ultraviolet (UV)-shielding effects. Herein, we innovatively adopt polysiloxane-15 as the soft film, trimethylsiloxysilicate as the hard film, and vinyl dimethicone/methicone silsesquioxane crosspolymer as the functional powder to construct a co-assembled sunscreen film, and we investigate the property-enhancing effects of the sunscreen film as well as the interaction between the silicone polymer-based film-forming agents and functional powder therein. The results show that structural similarity is essential to generating film-forming agent-powder interactions, which primarily enhance the Si-O bond binding energy, thereby enhancing the lasting protection effect of sunscreens. In addition, the inter-component interaction of the co-assembled sunscreen film inhibits the agglomeration of sunscreen paste to facilitate the formation of a homogeneous film, endowing the sunscreen with excellent UV protection abilities, with the sun protection factor (SPF) and protection factor of UVA (PFA) values increased by 61.58 and 43.84%, respectively. This work offers novel insights into the optimization of film-forming agent properties and the development of durable and efficient sunscreens.
成膜剂是防晒霜实现持久有效防晒的关键成分。然而，关于不同性质成膜剂的协同效应以及成膜剂与粉末之间相互作用的研究较少，这限制了具有强紫外线屏蔽效果的防晒霜的开发。在此，我们创新性地采用聚硅氧烷-15作为软膜、三甲基硅烷氧基硅酸酯作为硬膜、乙烯基二甲基硅氧烷/甲基硅倍半氧烷交联聚合物作为功能粉末来构建共组装防晒膜，并研究该防晒膜的性能增强效果以及其中有机硅聚合物基成膜剂与功能粉末之间的相互作用。结果表明，结构相似性对于产生成膜剂 - 粉末相互作用至关重要，这种相互作用主要增强了Si - O键的结合能，从而增强了防晒霜的持久保护效果。此外，共组装防晒膜的组分间相互作用抑制了防晒膏的团聚，促进了均匀膜的形成，赋予防晒霜优异的紫外线防护能力，防晒系数（SPF）和UVA防护系数（PFA）值分别提高了61.58%和43.84%。这项工作为优化成膜剂性能以及开发耐用高效的防晒霜提供了新的见解。
