Halogen free organic coatings for flame retarding applications
Incorporation of polyphosphate-rich compounds, such as PA, in an organic coating formulation is a challenging task. The UV curable FR-resin was prepared by reacting PA with isophorone diisocyanate to form a poly-isocyanate, which was further reacted with hydroxymethyl acrylate to produce methacrylated urethane resin (phyto-urethane-acrylate, PUA). Upon application on metal substrates, PUA resin was UV-cured using a photo initiator.
“Good” flame retardancy index
Surface coatings prepared using the PUA resin showed superior mechanical and thermal properties compared to coatings prepared with a commercially available resin. A proof-of-principle cone calorimetry studies showed that PUA based coatings demonstrated 30 % lower peak heat release rate (PHRR), 25 % lower total heat release (THR) and “Good” flame retardancy index (FRI) properties compared to control coatings prepared with commercially available resins.
The study has been published in Progress in Organic Coatings, Volume 172, November 2022.