Abstract
A series of UV-protected coatings were prepared using cerium-oxide-functionalized oil fly ash (f-OFA-CeO2) in waterborne polyurethane (WBPU) dispersions. Three monomers, namely, poly(tetramethyleneoxide glycol) (PTMG), polydimethylsiloxane-hydroxy terminated (PDMS) and 4,4-dicyclohexylmethane diisocyanate (H12MDI), were used to pre-mix with f-OFA-CeO2 separately, followed by the synthesis of WBPU/f-OFA-CeO2 dispersions. The f-OFA-CeO2 distribution and enrichment into any part (top/bottom/bulk) of the coating was strongly affected by the pre-mixing of f-OFA-CeO2. The f-OFA-CeO2 was densely distributed in the top, bottom and bulk when the f-OFA-CeO2 was pre-mixed with PDMS, H12MDI and PTMG, respectively. Only an f-OFA-CeO2-enriched top surface showed excellent UV protection. The lowest UV-degraded exposed coating was found when the top surface of the coating was f-OFA-CeO2-enriched.
Highlights
There is a wide range of organic coatings available commercially
The functionalized OFA (f -OFA)-CeO2 content was fixed at 2.00 wt% for all f OFA-CeO2 -based coatings
The f -OFA-CeO2 content was taken as 2.00 wt% due to the excellent protective properties; this was achieved in our previous reports [8]
Summary
There is a wide range of organic coatings available commercially. Each coating has both advantages and disadvantages. Each coating has been commercialized for certain application purposes. It is important to choose the proper coating before applying it to a surface, otherwise the coating may fail to fulfill the desired purpose. The coating itself can be divided into three parts, namely, bottom, bulk and top layers. The top part is very important for outdoor applications, as this part is mainly associated with UV degradation and discoloration, as well as functioning as a barrier for electrolyte passage [1,2,3,4,5]
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