Influence of nano-silica and polyethylene wax on the scratch behaviour of PU coatings

The scratch behaviour and resistance of acrylic-based polyurethane coatings were studied recently.

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The addition of nano-silica particles provides the increases in hardness -

The effects of fumed silica and polyethylene wax were investigated using an area-contact scratch tip, which can apply a constant load to the coating surfaces at a relatively low stress level. Measurements of the normalised changes in gloss (%Gn) and luminance (%Ln) could be provided as reliable and meaningful methodologies for estimating the scratch resistance and subtle damage to polymeric coating surfaces. A higher gloss-valued coating surface has better scratch resistance.

Increased hardness, transparency and scratch resistance

The addition of nano-silica particles provides the increases in hardness, transparency, and resistance to scratch damage for the acrylic-based polyurethane surface, whereas the polyethylene wax contributes to the increases in gloss and smoothness for the coating surface. The surface characteristics observed are responsible for the improved scratch performance of the acrylic-based polyurethane coating surface.

The study is published in: Journal of Coatings Technology and Research  September 2019, Volume 16, Issue 5, pp 1295–1303.

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