Posted on 30/01/2023 in Fire Safety 2023
Phytic acid, melamine, peanut shell PIN FR

Biobased PIN flame retardant reduces heat and smoke release from epoxy by over one third. Waste peanut shells were pyrolysed at 700°C, to produce biochar, which was then combined with phytic acid (a natural phosphorus rich molecule widely present in plant seeds) and melamine (a nitrogen compound). This bio-based PIN FR was then fixed into bisphenol epoxy resin by curing with diaminodiphenylmethane, at 3% PIN FR loading. The PIN FR did not significantly deteriorate epoxy brittleness and increased tensile strength. Peak heat release rate and total smoke release were reduced by 37% and 31%. Flame retardant effect is considered to result from inert gas release and structured char formation. The authors conclude that the phosphorus – melamine – peanut shell biochar material could be an effective, environmentally friendly PIN flame retardant for epoxy.

“A novel green IFR system: Design of a self-assembled peanut shell-based flame retardant and its fire performance in EP”, J. Liang et al., Progress in Organic Coatings 174 (2023) 107277

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