No More Agglomeration
Its composition is what makes this novel product special – at the heart of the dispersion are finely divided mineral and organic particles. The mineral components lend paints and renders considerable mechanical stability, low combustibility and long-lasting, vivid colors. The organic polymer component is based on acrylic esters and produces excellent adhesion to the substrate and a high degree of cohesion and flexibility.
The construction industry has been combining organic and inorganic components in binders for some time, often by simply mixing the mineral particles into an organic dispersion. There is a drawback, however: the particles can agglomerate, which compromises storage stability. Phase separation can also be a problem during film formation, resulting in an uneven, heterogeneous film. This inhomogeneity, in turn, destabilizes the bond and increases the risk of cracking.
“In PRIMIS® AF 1000, WACKER’s new mineralized binder, mineral and organic components are chemically bound together, which prevents them from agglomerating during storage and film formation,” explains Dr. Udo Kotschi, who helped develop the new dispersion at WACKER’s Application Technology department. PRIMIS® AF 1000, he points out, is also characterized by excellent film formation – even at low outdoor temperatures – and by the elasticity of the polymer surface at maximum blocking resistance. The results are stable, homogeneous films.