Polymer chains in binders generally only set fully when the temperature is at least 5 °C for the entire drying time (several days) and the coating does not get wet. PRIMIS® KT 3000 now considerably shortens this time frame – the critical period is reduced to six hours for wall paints and plasters that are formulated with the additive. Even when atmospheric humidity is high, a stable polymer network forms with PRIMIS® KT 3000.
This is due to the additive’s polymer base. The zinc acetate forms complexes with water molecules, while the polyethyleneimine binds the individual components in the paint or plaster to each other. That creates a kind of gel, which distributes homogeneously in the coating and makes it resistant to low temperatures and rain after just six hours. At the same time, water molecules can evaporate from the paint or plaster, allowing it to dry fully. The additive can readily be mixed with WACKER’s VAE dispersions of the VINNAPAS® range. In this way, PRIMIS® KT 3000 makes it possible to perform outdoor painting work in late autumn or spring in cooler regions, too.
VINNAPAS® EZ 3011 for High-Quality, Low-Emission Indoor Paints
Another novelty at the ECS 2017 is VINNAPAS® EZ 3011, a waterborne polymer dispersion based on vinyl acetate and ethylene that has a very low environmental impact. The product is manufactured without the use of alkylphenol ethoxylates (APEOs), plasticizers, film-forming agents or solvents, is low-odor and boasts a low formaldehyde content (< 20 ppm). It also lends itself to paint formulations that have a low volatile-organic-compound content (VOC < 1 g/L). Furthermore, VINNAPAS® EZ 3011 offers excellent pigment-binding capacity and high color consistency. The new dispersion is thus ideal as a binder for formulating high-performance yet low-odor and low-emission interior paints.