Sustainable polyurethane coatings derived from alkyds of Camelina oil monoglycerides

Abstract

This study presents the synthesis of sustainable urethane coatings derived from alkyds of Camelina oil (CO) monoglycerides, offering a sustainable alternative to petrochemical resources. Utilizing immobilized lipase for a low-temperature glycerolysis reaction, high-yield monoglycerides were obtained from CO. These were then reacted with dibasic acids (phthalic, succinic, and maleic anhydride) to produce alkyd diols, confirmed by both nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. The hydroxyl functionality of the alkyd diols showed a significant enhancement (up to 2200%) over crude CO produced Camelina-based alkyd diols were incorporated into polyurethane formulations and applied to metal substrates. Comprehensive performance evaluations revealed their superior mechanical, thermal, and chemical properties in comparison with previously reported plant-based alkyd-urethane coatings, especially for the phthalic anhydride-derived alkyd diol. The present research underscores the potential of Camelina-derived alkyds in creating high-performance, plant-based coatings, aligning with recent sustainability trends in material science.