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24. Nov 2021 | Application Areas

Phytic acid for improved flame retardancy of wood

A recently published paper studied the influence of phytic acid on the flame retardancy and the adhesion performance enhancement of poly (vinyl alcohol) hydrogel coating to wood substrate.
The green fireproof hydrogel coating does not release any toxic volatiles.
Image source: pxel_photographer - Pixabay (symbol image).

Traditional fireproof strategies for wood mainly involve using organic flame retardants that may affect human health and environment. Scientists now proposed an easy-to-process, environmentally friendly and highly efficient polyvinyl alcohol (PVA)/phytic acid (PA) hydrogel coating to improve flame retardancy of wood by freeze-thaw cycles. PA can promote the gelatinisation of PVA and further enhance mechanical properties and flame retardancy of PVA coating.

Ensured fire-safety of wood

The obtained PVA/PA hydrogel coating shows better adhesion and fire-safety performance compared to pure PVA hydrogel coating, including achieving 151.68 kPa of adhesion strength, reaching V0 rating in UL-94 test, a significant enhancement of time to ignition (TTI, from 63 s to 130 s), and 51.47% and 55.47% decrease in the mean heat release rate (HRR) and total release rate (THR), respectively. According to the researchers, the PVA/PA coating with enhanced superior adhesion and flame-retardant properties ensures the fire-safety of wood for its wide applications as structural materials in architecture and furniture fields.

The study has been published in Progress in Organic Coatings, Volume 161, December 2021.

European Coatings Journal


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