Bio-based wood protection

A new study aimed to synthesise a novel UV-curable reactive diluent by reacting bio-based adipic acid with diethanolamine, followed by functionalising it with glycidyl methacrylate. UV-curable bio-based oligomer was prepared by a ring-opening reaction of epoxidised castor oil with acrylic acid.

Impressive stain resistance properties

A series of bio-based UV-curable formulations were prepared by combining synthesized reactive diluent with the oligomer and applied on wooden substrates. The effect of incorporating different concentrations of synthesised reactive diluent ranging from 10 to 40 wt.% on the viscosity of the synthesised oligomers was investigated by studying their rheological behavior. The UV-cured coatings were further evaluated for their extent of curing, bio-content, acid, alkali, and boiling water resistance. Thermal properties of films were further characterised for TGA and DSC. Cured coating with 40 wt.% reactive diluent exhibited 86 gloss at 60°, 5H hardness, 5B adhesion, 81.27 °C glass transition temperature, and maximum thermal decomposition temperature of 454 °C. The cured coatings have shown impressive stain resistance properties.

The study has been published in Journal of Coatings Technology and Research, Volume 22, Issue 1, January 2025.

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