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Effect of nanosilica and ZnO nanoparticles on abrasion and UV resistance of waterborne polyurethane coating

Crespo-Soler A., Lardies-Miaza N.

Farby i Lakiery

2014

nr 5

3--10

In this paper, commercial nano zinc oxide (nano-ZnO) and nanosilica (nano-SiO2) were employed as fillers to improve the properties of abrasion and UV resistance in a waterborne polyurethane coating. Various dispersion techniques were studied to prevent the aggregation of primary nanoparticles in the polyol mixture. The nanoparticles dispersion was studied by OM and SEM. Polyols containing nanoparticles were mixed with the suitable isocyanate amount to obtain a polyurethane water based coatings. The resultant polyurethane nanocomposite was characterized according to abrasion resistance (ASTM D 4060) and QUV resistance (ASTM D 4587). Abrasion resistance was improved adding different percentages of nanosilica nanoparticles but no improvement was obtained regarding UV resistance. Nano zinc oxide nanoparticles contributed to enhance neither abrasion nor UV resistance, maybe due to catalytic reaction of nano-ZnO over PUR matrix.