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

Abstract

AbstractFirstly, 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.