Nanotech 2010

How Dispersed Nanoparticles Work to Increase Resistance to Scratch Mar, Wear and UV protection, in Today’s Coatings (invited presentation)

R. McMullin
BYK USA Inc, US

Keywords: mar, wear, scratch

Abstract:

Recently introduced liquid additives containing alumina and/or silica Nanoparticles can provide improved scratch resistance for general industrial, wood, coil and architectural coatings. These new nano silica and alumina particles range from 10 nm in diameter to 40 nm in diameter. They are dispersed with boundary phase technology in different media and are very easily incorporated by low shear into aqueous, solvent based, solvent free and UV- curing systems. Typically, dosages of 0.5 – 3.0% provide significant and long-term scratch and/or abrasion resistance without adversely affecting gloss, color, clarity or other physical properties of the high gloss, semi-gloss, and satin clear coatings. These new nano silica and alumina particles can also be incorporated into pigmented coatings. The nano silica and alumina particles not only offer scratch resistance but can assist in wear resistance, better adhesion, staining, and corrosion resistance because the nano particles create a denser film structure. The inclusion of surface-active modified poly dimethyl siloxanes by its orientation and crosslinking at the coatings surface enhances the performance of the Nanoparticles. Where high gloss is not issue, combinations of the larger 60 to 80 nm alumina particles that are dispersed with boundary phase technology in different media and are very easily incorporated by low shear into aqueous, solvent based, solvent free and UV- curing systems. Typically, dosages of 1.0 – 6.0% provide significant and long-term scratch with waxes and matting agents to allow the formulation of semi-gloss, semi-transparent to opaque scratch resistant coatings. . Amongst inorganic UV absorbers, zinc oxide and cerium oxide stand out with its almost complete adsorption of UV-A, B, and C. Reduction of particle size from micron to nano enables the formulator to formulate clear coatings that can both enhance the appearance of wood substrates as well as provide long-term protection for the wood metal and plastic substrates against UV degradation. Comparisons between the typical organic UV absorbers will be made with available inorganic UV absorbers.
 
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