Dispersion blend strategy to optimize 1-k and 2-k PVDF hybrid dispersion formulations

Recent advances in poly(vinylidene fluoride) hybrid technology have led to OH-functional waterborne dispersions, which can be crosslinked with polyisocyanates in 2-component (2-k) formulations to make ultra-durable PVDF/urethane coatings with exceptional hardness. In this paper, we present studies in which the performance of these OH-functional PVDF dispersions is modified through the incorporation of new commercial catalysts or blocked isocyanate crosslinkers in the formulation. In 2-k formulations, several catalyst dispersions with different chemistries can be effective in increasing the property development rate. Using dispersions of blocked polyisocyanates, good performance can be achieved in a 1-component system at a relatively low (120-130 °C) bake temperature, although the performance improvement in this case appears to be attributable as much to the effect of baking on the base resin as to the effects of crosslinking.
Duration: 22:22
Speaker: Kurt Wood
Company: Arkema, Inc
Conference: European Coatings Congress
Session: Polyurethanes
Location: Nürnberg
Date: 20.04.2015