Clay (nano flakes) enhances the weather resistance of polyurethane nanocomposed coatings, salt spray corrosion and adulation resistance

In the current work, the physical, structural and chemical aspects of PU and PU-nano clay coatings have been studied. Nano clay protects PU chains and energy groups from degradation.
such as weather resistance and corrosion resistance are essential for automotive finishes and are
in
. Using two types of clay Cloisite 30B (C30B) and Closeite 20 A (C20 A), the 2K polyurethane (PU) packaging coating formulation has been modified at the nanoscale.
these coatings show better salt spray resistance (500 hours) and accelerated weathering conditions (1000 hours). When the nanoscale morphology of these nanocomposic coatings observed in the Atomic Force Microscope (AFM) shows the formation of a trophic (C30B) and rod-sized hard chain segment - 200 nanometers, this is more evenly formed and evenly distributed across the microscale surface (surface texture) than the simple PU coating.
better nano-composite coating performance
vision, spectroscopic and chemical analysis confirms the better performance of nano-composite coatings in UV/humidity and salt cycles. Dry film thickness and gloss; The dft 1000 (G (1000)) reduces the pure PU by 25% (32%), the PU-3C30B by 14.03% (16.7%) and the PU-3C20 A by 20% (22.7%). The total color difference between PU, PU-3C30B, and PU-3C20A's CIELab values, E, is 9.794, 7.623, and 8.450.
for PU, salt spray (500 hours) produces about 35% of the low carbon steel (ms panel) area, while for pu-3C30B and PU-3C20A, it is only 5% and 10%, respectively. Fourier Transform Infrared (FTIR) shows that the aging and corroded nanocomposed coating retains the body better than the original coating. This proves that properly peeled two-dimensional clay particles interact with hard chain segments and play an important role in resisting weathering, salt spray corrosion and even damage.