Achieving Excellent Multi-Substrate Adhesion for Architectural Coatings
Substantial differences across substrate surface properties make it very difficult for architectural coatings to achieve superior multi-substrate adhesion. This challenge is further complicated by the need to balance adhesion with other important coating properties. Our latest developments on emulsion polymers achieve this challenging goal, delivering a solution that improves the resilience of low-VOC coatings. We investigated the role that different polymer design factors have on adhesion to identify a solution that will successfully adhere to chalked paint, fresh wood, aluminum, galvanized steel, smooth steel, and alkyd paint. This paper explores the impact that hydrophobicity/hydrophilicity balance, molecular weight, particle morphology, and glass transition temperature of aqueous polymer particle dispersion has on multi-substrate adhesion. It also covers specific examples of flat and semi-gloss formulated coatings achieving superior multi-substrate adhesion, while simultaneously delivering overall excellent performance in other key attributes such as dirt pick-up resistance, surfactant leaching, stain resistance and flexibility, among others.