Eco-friendly fire-resistant coatings

Researchers have published a comparative study of fire-resistant coatings based on high and low molecular weight tannins.

A coniferous tree with focus on the bark as a symbol image.
The polymers were derived from gum rosin Image source: ChiaraG6 - Pixabay (symbol image).

In order to provide adequate fire resistance to construction materials, such as steel and wood, the use of high and low molecular weight tannins (TMw-H and TMw-L), extracted from the bark of Pinus radiata, as carbonaceous agents, was studied. The molecular weights of both extracts varied between 2986 and 5573 Da, and they were mainly composed of catechin and taxifolin.

Excellent fire-retardant properties

Eco-friendly water-based formulations were obtained, without producing volatile organic compounds (VOCs), by varying the extract content between 15.5 and 37.8% w/w. The coatings, varying in thickness and substrates, were evaluated for their film-forming properties, covering power, mechanical properties, such as adhesion, embossing, abrasion, and flexibility, as well as their resistance to fire. The results indicated that good mechanical properties were obtained when using coatings containing TMw-L compared with those obtained when using TMw-H. The carbonisation index (28%) and the mass loss percentage (9.35%) of the coatings containing TMw-L compared well to commercial coatings, indicating that they have excellent fire-retardant properties. However, the behavior of the TMw-H containing coatings was rather intumescent.

The study has been published in Journal of Coatings Technology and Research Volume 19, 2022.

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