Effects of Latex Particle Morphology on the Film Formation and Properties of Fluoropolymer-Based Latex Paints
Since the PVDF solvent dispersions contain substantial levels of VOCs and require a high temperature bake, there has been recent interest to develop PVDF-based latex systems that give low-VOC coatings at ambient temperatures, while maintaining the advantageous properties of solvent PVDF paints. In this paper we consider latex systems containing PVDF resins and acrylics, at ratios similar to commercial solvent PVDF coatings. For these latex systems, differing latex morphologies can be obtained through cold blending (blending latexes of differing composition), or by making structured latex particles. The structured acrylic-modified fluoropolymer (AMF) latexes are prepared by a seeded emulsion polymerization process.
In this feature we also discuss the particular advantages that can be obtained for low-VOC coatings, which are based on AMF latexes made with an IPN-type morphology.