Structure/activity relationships of water-borne stain-blocking binder technologies

 
Universal stain blocking ability of tannin and other staining ingredients found in many wood substrates as well as dyes and markers remains a substantial challenge for waterborne primers. Apart from a baseline of strong stain-blocking performance, waterborne primer systems also need to fulfill further important criteria like good adhesion properties to various substrates, sand-ability, excellent hiding power, early recoat-ability and extended outdoor durability, just to name a few examples. The presented work focuses on comparison of various waterborne binder technologies, including but not limited to cationic, anionic, zwitter-ionic and multi-domain binder concepts and their overall performance profiles in stain-blocking primer applications. Structure/activity relationships with respect to universal blocking performance will be outlined and discussed.