Study on polyurethane-acrylate/cerium dioxide modified by 3-(Methylacryloxyl)propyltrimethoxy silane and its UV absorption property

Firstly, cerium dioxide(CeO₂) was modified by 3-(Methylacryloxyl)propyltrimethoxy silane (KH-570), and modified CeO₂ (mCeO₂) was prepared. Then poly (urethane-acrylate) was modified by mCeO₂, and poly (urethane-acrylate)/modified CeO₂ (PUA/mCeO₂) composites with ultraviolet absorption property were prepared. The morphology, thermal hydrophobicity, mechanical properties, optical properties, and UV-absorption properties of PUA/mCeO₂ composites were studied. XRD and SEM analysis showed that the modified CeO₂ had better dispersion in the matrix than that of pure CeO₂. Ultraviolet–visible spectrum and thermogravimetric analysis were used to characterize the optical properties and thermal stability of PUA/mCeO₂ composites. The results showed that with the increasing of the mCeO₂ content, the UV-absorption property of PUA/mCeO₂ composites was improved gradually. When the content of mCeO₂ is 3%, the absorption of ultraviolet of PUA/mCeO2 composites is about 5 times of pure PUA film, and the absorption band is mainly in the UVA section. The thermal stability of PUA/mCeO₂ composites was improved with the adding of mCeO₂. With the increasing of mCeO₂ content, the contact angle of PUA/mCeO₂ composites increased significantly. And the UV-absorption mechanism of PUA/mCeO₂ Composites was studied. UV-curable PUA/mCeO₂ composites have good UV absorption property and water resistance. They will be used in the sun screen and protect people's skin.