Antiglare waterborne polyurethane/modified silica nanocomposite with balanced comprehensive properties

To endow antiglare waterborne polyurethane with toughness, thermal stability, and water resistance is highly desired. Herein, we first prepared amphiphilic polyurethane modified silica (MSiO2) nano-particles by in-situ polymerization and then physically incorporated it with waterborne polyurethane (WPU) dispersion to fabricate WPU composite (WPU-MSiO2). The FT-IR, TG-DTG, and SEM analyses demonstrated that the urethane chains were covalently attached onto the silica surface, and the MSiO2 exhibited good dispersibility and compatibility with WPU matrix. Moreover, embedded MSiO2 particles could not only impart the WPU-MSiO(2 )composites with good antiglare function, but also improve the mechanical, thermal, and water resistance of composites. Notably, the most effective enhancements in antiglare and other physicochemical performances were achieved when incorporating 3 wt% of MSiO2 into the WPU dispersion to fabricate the WPU-MSiO(2)3 composite. In particular, the WPU-MSiO(2)3 composite film possessed the transmittance of 94.6% and 60 degrees gloss of 27.0, respectively, which satisfying the requirement of an antiglare coating. Furthermore, WPU-MSiO(2)3 composite exhibited great increase in tensile strength, elongation at break, maximum decomposition temperature, and water contact angle (20.8 MPa, 636.5%, 389.5 degrees C, and 99.1 degrees, respectively) as well when compared to the neat WPU and WPU-SiO(2)3 films. The present research provided a cost-effective way for preparing high-performance antiglare polymer coatings.

Automated summary

In this study, amphiphilic polyurethane modified silica (MSiO2) nanoparticles were prepared using in-situ polymerization and physically incorporated with waterborne polyurethane (WPU) dispersion to fabricate WPU composite (WPU-MSiO2). The composite exhibited good antiglare function and improved mechanical, thermal, and water resistance properties. Notably, the WPU-MSiO23 composite showed the best performance in terms of antiglare and other physicochemical properties.