Oyster shells to form flame-retardant epoxy
In a new work, a phosphorus-free and green organic-inorganic hybrid flame-retardant system was facilely constructed based on oyster waste via mechanochemical strategies for flame-retardant epoxy (EP). The characterisation results showed the successful exfoliation of the lamellar structure in oyster waste during the mill process. Manufacttured EP composites exhibited a short combustion time during the vertical combustion test. And the limited oxygen index value of EP composites increased from 24.4 % to 27.3 %.
Enhanced fire safety
Remarkably, the introduction of treated oyster shell powder enhanced the fire safety of EP (e.g., ∼41.8 % and 55.0 % decline in peak heat release rate and total CO production at only 4 wt% content). Hence, the work offers novel insights into the facile construction of a phosphorus-free and green organic-inorganic hybrid flame-retardant system and recycling oyster waste.
The study has been published in Progress in Organic Coatings, Volume 179, June 2023.