The Studying of Weathering Stability of Pu Coatings Filled With Aptes-Treated Go/Zn-Al Ldh

In this study, at first, graphene oxide (go) and zn-al-no3- ldh nanoparticle were synthesized via co-precipitation and then surface-treated with silane coupling agent. the nanoparticles were characterized by raman spectroscopy, x-ray diffraction (xrd), and field scanning electron microscopy (fe-sem). the characteristic analysis illustrated that go and silane were successfully attached to ldh and go nanoflakes were intercalated into ldh agglomerate. all unmodified and modified particles were introduced into pu coating at three level (1, 2 and 3 wt.%) and then subjected to accelerated weathering conditions. after exposure, it was obvious that resistance to yellowing (∆b) in the presence of modified samples have increased significantly. meanwhile, there was a clear trend in the different percentages of silane modified nanoparticles. the higher loading of the ldh-go-si particle is, the lower yellowing the coating experiences. the roughness changes of different samples (table shown below) reveled that the roughness of all specimens increased after being exposed to weathering condition except ldh-go-2.

The studying of weathering stability of PU coatings filled with APTES-treated GO/Zn-Al LDH

In this study, at first, graphene oxide (GO) and Zn-Al-No3- LDH nanoparticle were synthesized via co-precipitation and then surface-treated with silane coupling agent. The nanoparticles were characterized by RAMAN spectroscopy, X-ray diffraction (XRD), and field scanning electron microscopy (FE-SEM). The characteristic analysis illustrated that GO and silane were successfully attached to LDH and GO nanoflakes were intercalated into LDH agglomerate. All unmodified and modified particles were introduced into PU coating at three level (1, 2 and 3 wt.%) and then subjected to accelerated weathering conditions. After exposure, it was obvious that resistance to yellowing (∆b) in the presence of modified samples have increased significantly. Meanwhile, there was a clear trend in the different percentages of silane modified nanoparticles. The higher loading of the LDH-Go-Si particle is, the lower yellowing the coating experiences. The roughness changes of different samples (Table shown below) reveled that the roughness of all specimens increased after being exposed to weathering condition except LDH-GO-2.