NEW POLYOL FOR PRODUCTION OF RIGID POLYURETHANE-POLYISOCYANURATE FOAMS Part 2: Preparation of rigid polyurethane-polyisocyanurate foams with the new polyol

Method of preparation, the determination of foaming parameters and methods for the determination of physicochemical properties of PUR-PIR foams prepared with the use of N,N'-di(methyleneoxy-2-hydroxyethyl)urea and boric acid derivative has been presented in this paper. It was found that application of the borate as a polyol component and simultaneously as a flame retardant in the recipe for production of polyurethane-polyisocyanurate foams (PUR-PIR) was very favourable. The foams prepared were characterized by reduced brittleness, higher compressive strength and content of closed cells as well as considerably lower flammability in comparison with standard foam. The results show that the new polyol prepared on the basis of N,N'-di(methyleneoxy-2-hydroxyethyl)urea and boric acid can be applied for production of rigid polyurethane-polyisocyanurate foams and it improves their physicochemical properties.