The modification of waterborne polyurethane(WPU) coating can be improved, and the nanocomposite particles can be added to WPU coating, and its mechanical properties and ultraviolet resistance can be improved.GO was synthesized by modified Hummers method, nano?ZnO/CeO₂ by copprecipitation, and nano?GO?ZnO/CeO₂ by in situ polymerization.It was also characterised by FT?IR,TEM,SEM,XRD,etc.,and the effect of nano?GO?ZnO/CeO₂ doping on the performance of WPU was explored.The results showed that nano?GO?ZnO/CeO₂ was composed of hybrid particles formed by ZnO and CeO₂ of cubic crystal fluorite structure on the GO surface. Compared with the pure WPU film,the fracture tensile strength and elongation at break of the WPU film with the addition of a mass fraction of 0.6% nano?GO?ZnO/CeO₂ increased by 43.1% and 47.0%.After 168 h of UV aging experiments,the modified membrane absorbed 15.4% of water,increased the tensile strength at break by 328.0% and the elongation at break by 39.0%.It shows that nano?GO?ZnO/CeO₂ can effectively improve the mechanical properties and UV aging resistance of WPU after film formation.

The UV shielding properties and photocatalytic properties of nanomaterials will vary due to the different surface binding energies of the materials themselves.Nano?zinc oxide (NPs?ZnO),nano?ceria (NPs?CeO₂), NPs?ZnO/CeO₂ and graphene oxide modified zinc oxide/ceria nanocomposites (NPs?ZnO/CeO₂@GO) were prepared,and the prepared samples were characterized by XRD,FT?IR,SEM,and the UV shielding properties and photocatalytic properties were tested. The results show that the UV shielding ability: NPs?ZnO<NPs?CeO₂<NPs?ZnO/CeO₂<NPs?ZnO/CeO₂@GO, the maximum degradation rate of methylene blue dye after 3 h treatment is:NPs?ZnO/CeO₂@GO(0.92)>NPs?ZnO(0.89)>NPs?ZnO/CeO₂(0.75))>NPs?CeO₂(0.66).Moreover,the photocatalytic activity of NPs?ZnO/CeO₂@GO is stronger than other photocatalysts participating in the experiments.