Improving the Adhesion 2K Michael Robustness of Additional Coating Systems

By B.Noordover, N. Looij, J. Kalis, R. Koeken, F. Van Wijk, E. De Wolf, M. Gessner, E. McCracken, B. DeGooyer, R. Brinkhuis, Y. Zhang, T. Buser, F. Lunzer

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.