Facile Preparation and Excellent Ultraviolet Shielding Application of Polyurethane‐TiO2 Composite Microcapsules

Abstract In this work, butyl stearate, isophorone diisocyanate, and glycerol are used to prepare reticulated polyurethane microcapsules using interfacial polymerization. In addition, anatase nano‐TiO 2 is added to prepare TiO 2 ‐polyurethane phase change microcapsules during the polymerization process. Polarized light microscope, scanning electron microscope, Fourier‐transform infrared spectroscopy, thermogravimetric, differential scanning calorimeter, and other methods demonstrate the successful preparation of microcapsules, and microcapsules with different TiO 2 content have differences in morphology and performance. It is worth noting that the addition of TiO 2 enhances the thermal stability and mechanical strength of the prepared composite microcapsules. In addition, TiO 2 particles allow the microcapsules to have photocatalytic properties and ultraviolet shielding properties, and the prepared TiO 2 ‐polyurethane composite capsules show good catalytic degradation properties for methyl orange solution. Moreover, the ultraviolet absorption performance of the TiO 2 ‐polyurethane composite microcapsule coating is tested, and the results show that the strength of ultraviolet light is weakened after passing through the coating, indicating that the composite microcapsule can enhance the UV resistance of the coating. This work shows the preparation of multifunctional microcapsules and their potential applications in photocatalysis and UV resistance.