This paper describes recent work to develop 2-component aqueous topcoat formulations, based on PVDF-acrylic hybrid dispersions crosslinked with polyisocyanates, which meet the requirements of the new SSPC Paint 471  standard for highly weatherable fluoropolymer topcoats, and when combined with conventional primer and midcoat technology, also meet the requirements of IEEE(1) standards C57.12.282  and C57.12.293  for pad-mounted transformer enclosures. Enhanced weatherability is primarily conferred by having relatively high levels of fluoropolymer in the coating binder. Chemical resistance is obtained by a combination of high fluoropolymer level plus crosslink density. Barrier properties contributing to corrosion resistance depend on both these compositional factors, as well as on other formulation details.

Subject
Primers, Zinc rich coatings, Fluoropolymers, Top coats, Binders, Solvents, Chemical resistance, Polyvinylidene fluoride, Color, Coating service life, Corrosion resistance, Paints, Resins
Keywords:
“Polyvinylidene fluoride” PVDF fluoropolymer topcoats “SSPC Paint 47” C57.12.28 C57.12.29
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2022
Association for Materials Protection and Performance (AMPP)
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