New W&D additives for water-borne coatings - no pain with rain and stain anymore

 
Due to the difference in surface tension between pigments and water, wetting and dispersing additives are being used to obtain good processability for water-borne coatings. Apart from pigment affine groups, these additives exhibit hydrophilic segments to facilitate the system compatibility and provide steric stabilization of pigments. As these components remain in the cured coating, they bear the risk to increase overall hydrophilicity and, thus influence certain coatings characteristics such as water, stain and corrosion resistance negatively. Therefore, wetting & dispersing additives are selected not only by their ability to ensure pigment stabilization but also by their ability to minimize detrimental effects on water sensitivity. This is especially important for anticorrosive primers, DTM coatings or wood coatings, where stain resistance is required. BYK has developed dispersing additives based on novel chemical structures, which combine sufficient viscosity reduction and deflocculation of inorganic pigments on one hand as well as least negative influence on water, stain and corrosion resistance on the other hand.