“Exterior walls are made with all kinds of building materials, such as natural stone, concrete and bricks. Each of these mineral-based materials responds differently to weathering and environmental factors,” explains Christian Putz, a paint systems engineer at WACKER in Burghausen. “Yet, for all of them, silicone resin emulsion paints provide the most effective protection,” he stresses.
When it comes to the ingredients that are needed to make up the proper paint formulation, this WACKER expert knows his stuff. He used his knowledge to help the Kenyan paint maker develop the optimum recipe for the regional market. “The ingredients and the mixing ratios are crucial to the end result,” says Putz. However, all the recipes have one thing in common: they contain a silicone resin binder. “Silicone resin emulsion paints dry to form a microporous film that allows high water-vapor permeability while protecting the wall against liquid water,” explains Putz. In the process, the silicone-resin binder forms a network structure, and we therefore use the term “silicone resin network.” The backbone is a stable silicon-oxygen chain, while organic groups, like little umbrellas, are responsible for the water repellency – giving the paint its hydrophobic and weathering-resistant properties.