The Novel Application of Organosolv Lignin Extracted from Eucalyptus Sawdust in the Synthesis of Alkyd Resin

This study explores the potential of lignin as a feedstock for the green manufacture of alkyd resins, utilizing an underutilized component of cellulosic biomass. The use of eucalyptus sawdust for this purpose provides the novel backbone for this research. The conventional production of polyester resins relies on petroleum-based pentaerythritol, which has far-reaching environmental effects. Addressing this issue, organosolv lignin extracted from eucalyptus sawdust using acidified methanol was utilized to synthesize flexible alkyd resins. The resulting product, a monoglyceride, was reacted with maleic anhydride to give an alkyd resin. The resin was further incorporated into a paint and varnish formulation. The study employed quantitative analysis of the resin, paint, film, and varnish through UV-Vis and FTIR spectroscopy, evaluating their optical properties and transmittance. The outcome was an alkyd resin with optimal flexibility and excellent optical properties, enabling its use on diverse substrates. This research contributes to a more sustainable manufacturing approach, reducing dependence on petroleum-based materials in paint and varnish formulations.