Flame retardancy of acrylic emulsion resin intumescent coatings added with alkaline lignin on plywood

2024年08月29日08:54 来源：无

Researchers found that the addition of 5% alkaline lignin to water-based intumescent coatings results in an optimal formation of a protective char layer during combustion.

The research proves that intumescent coatings with 5% alkaline lignin exhibit superior flame retardancy compared to those with higher concentrations of alkaline lignin. Source: Adobe Firefly - adobe.stock.com

A 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. 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.

Journal of Coatings Technology and Research, Volume 21, pages 611–622, (2024)

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