Tailored Biobased Resins from Acrylated Vegetable Oils for Application in Wood Coatings

Coatings 2023
Sabīne Briede, Oskars Platnieks, Anda Barkāne, Igors Sivačovs, Armands Leitāns, Jānis Lungevičs, Sergejs Gaidukovs

The modern coating market is dominated by acrylic, polyurethane, and polyester polymer resins produced from unsustainable fossil resources. Herein, we propose the preparation of resins from biobased components to produce functional and solvent‐free wood coatings with enhanced performance properties. Acrylated rapeseed, linseed, and grapeseed oils were prepared via a onestep synthesis and used as a basis for the control of resin viscosity and fatty acid content. A combination of vegetable oil acrylates was used as a matrix and the biobased monomer propoxylated glycerol triacrylate (GPT) was selected to tailor the properties of the UV crosslinked network. During polymerization, the GPT monomer induced a two‐phase microstructure as indicated by an SEM analysis. The possibility of generating a tailored microstructure in the final material was examined in this study. The addition of GPT increased the storage modulus by up to five‐fold, crosslink density by up to two‐fold at 20 °C, and glass transition temperature by up to 10.2 °C. Pull‐off adhesion tests showed a strength of 1.21 MPa. In addition, the photo‐oxidation effect on samples, i.e., aging, was assessed with microhardness, sliding friction, and optical microscopy. Coatings showed a microhardness value up to 250 MPa, while a coefficient of friction (μ) was in the range of 0.21 to 0.88.

Keywords
UV photopolymerization; photo‐oxidative degradation; microhardness; adhesion; sliding friction
DOI
10.3390/coatings13030657

Briede, S., Platnieks, O., Barkāne, A., Sivačovs, I., Leitāns, A., Lungevičs, J., Gaidukovs, S. Tailored Biobased Resins from Acrylated Vegetable Oils for Application in Wood Coatings. Coatings, 2023, Vol. 13, No. 3, Article number 657. e-ISSN 2079-6412. Available from: doi:10.3390/coatings13030657

Publication language
English (en)