Flame retardancy of acrylic emulsion resin intumescent coatings added with alkaline lignin on plywood
Researchers found that the addition of alkaline lignin to water-based intumescent acrylic coatings improves the flame retardant properties of wood-based materials.
The research proves that intumescent coatings with alkaline lignin have superior flame retardancy compared to those without additives. Based on this information, intumescent water-based coatings containing 5% alkaline lignin significantly improved the flame retardancy by promoting the formation of an ideal char layer during combustion.
The study investigated the flame retardancy of water-based intumescent coatings for plywood by conducting flame retardancy tests by using water-based acrylic resin mixed with various concentrations (1%, 3%, 5%, and 10%) of alkaline lignin. Intumescent coatings containing alkaline lignin demonstrated superior flame retardancy compared with those without additives. At a concentration of 5%, the alkaline lignin promoted the formation of an ideal char layer during combustion.
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The chemical structure and durability of the phosphorus–carbon structure in the intumescent coatings were investigated through Fourier transform infrared spectroscopy and solid-state nuclear magnetic resonance analysis (13C and 31P). The analysis results reveal that intumescent coatings containing 5% alkaline lignin were more effective in reducing flammability than those containing higher concentrations of alkaline lignin.
This research has been published in the Journal of Coatings Technology and Research, Volume 21, 2024.
