Nano composite binders

Jonas Karlsson, Account Manager Nordic, Adhesive and Construction Polymers, BASF AB, Sweden

With BASF's newest nanocomposite binder inorganic nanoparticles are homogeneously incorporated into the organic polymer particles of a water-based dispersions so that, after application and drying, a homogenous, three-dimensional network of nanoparticles is formed, which covers the entire film. Comprehensive comparative tests involving traditional dispersion coatings have shown that facade paints with this new binder are not only extremely durable, but also uncompromising when it comes to dirt pick up, chalking and other properties.

Thanks to the hydrophilic nanocomposite paints with BASF's nanocomposite technology, facade coatings become wettable. The longer a facade is exposed to the elements, the more hydrophilic it becomes, since, as with standard dispersions, the coating film changes over the course of time. However, in nanocomposite coatings based on COL.9® an extremely homogenous surface cover with silica nanoparticles is retained. With prolonged exposure to weathering, the original hybrid inorganic-organic character of the coating changes to become a purely mineral surface, similar to that seen with silicate paints. Water spreads immediately over the hard, inorganic network, wetting it completely and allowing any dirt to be washed away easily.