Fabrication of poly(vinylidene fluoride)-based composite powder coating with enhanced adhesion performance

Given the environmental benefits, poly(vinylidene fluoride) (PVDF)-based composite powder coating was developed without using any harmful solvent. However, it still remains poor adhesion to substrates and low compatibility to acrylic resin issues. To address these challenges, PVDF was grafted with glycidyl methacrylate (GMA) through a facile and scalable reactive extrusion method. The resulting product, PVDF-g-GMA, was then mixed with different contents of polymethyl methacrylate (PMMA), and the mixing was sprayed onto aluminum substrates. The PVDF-g-GMA/PMMA powder coating shows the excellent adhesion and corrosion resistance, particularly when the PMMA content is 30 wt%, owning to the good compatibility of PVDF-g-GMA and PMMA. This work opens up a new possibilities for the development of advanced composite powder coatings with improved performance characteristics.