Effect of coated and encapsulated polyacrylate/nano-SiO2 composite emulsions on the finishing performances of leather via miniemulsion polymerization

摘要

In this study, the polyacrylate/nano-SiO2 (PA/SiO2) composite emulsion with ideal encapsulated and coated morphologies were prepared by miniemulsion polymerization. They, respectively, are encapsulated PA/SiO2-S composite emulsion, coated PA/SiO2-Q and PA/SiO2-W composite emulsion. The morphology of the composite emulsions were characterized by transmission electron microscope, and the results showed that the nano-SiO2 were encapsulated inside or coated around the latex particles. We investigated microstructure and properties of the composite emulsions after film formation which effect by nano-SiO2 existence forms by scanning electron microscope, thermogravimetric analysis, tensile strength, elongation at break and water absorption test. The PA/SiO2-W composite film had the best tensile strength of 6.3 MPa and a maximum thermal decomposition temperature of 415.2 degrees C. Furthermore, the PA/SiO2 composite emulsions were applied to leather finishing. The results demonstrated that the PA/SiO2-W composite emulsion increased the breathability and water vapor permeability of leather simple to 210.8 and 69.8, respectively, which shows the emulsion has excellent comprehensive performance and potential application as the leather finishing agent.