Improving the Adhesion Robustness of 2K Michael Addition Coating Systems

Authors :: Noordover, B.
Looij, N.
Kalis, J.
Koeken, R.
Van Wijk, F.
De Wolf, E.
Gessner, M.
McCracken, E.
DeGooyer, B.
Brinkhuis, R.
Zhang, Y.
Buser, T.
Lunzerallnex, F.
Source :: CoatingsTech. October, 2019, p45, 5 p.
Publication Year :: 2019
Abstract: Recently, two-component (2K) Michael Addition-based coating systems providing fast drying at room temperature in combination with tunable open time and very long pot life have entered the market. Adhesion robustness over a variety of substrates is an important point of attention for such fast drying and inherently rather apolar coating systems. Here, we present a study that resulted in new malonated polyester resins facilitating a significantly improved adhesion performance of the Michael Addition-based coatings, especially over epoxy-amine and polyurethane primer substrates. Notably, the introduction of hydroxyl groups is an effective way to improve properties such as wet adhesion.<br />INTRODUCTION In 2015, a breakthrough high solids two-component (2K) coatings system was introduced, based on Real (or Carbon) Michael Addition (RMA) chemistry. (1) In this base-catalyzed system, malonated polyester donor [...]