Oenothera biennis seed oil as an alternative raw material for production of bio-polyol for rigid polyurethane-polyisocyanurate foams

摘要

The aim of this article is to discuss a process of obtaining a new bio-polyol based on an oil from Oenothera biennis seeds and 2,2'-mercaptodiethanol (2,2'-MDE) and its use for rigid polyurethane-polyisocyanurate (PUR-PIR) foams. The synthesis of the polyol was carried out with a two-step method. Firstly, the double bonds of unsaturated fatty acid residues were oxidized and subsequently the epoxide rings were opened by 2,2'-MDE. The properties of the obtained bio-polyol were examined for its use as a raw material for rigid polyurethane-polyisocyanurate foams, i.e. hydroxyl value, acid value, density, viscosity, pH, water content. Spectroscopic studies (FTIR, H-1 NMR and C-13 NMR) were also performed. Aforementioned studies confirmed the assumed chemical structure of the new polyol. The formulations of rigid foams containing from 0 to 0.3 mass equivalents of the new bio-polyol were arranged on the basis of obtained results. A significant impact of the new bio-polyol on functional properties of foams was noted: apparent density, compressive strength, brittleness, absorbability, water absorption and flammability. Modified foams had better functional properties than the reference foam.