Rigid polyurethane-polyisocyanurate foams modified with grain fraction of fly ashes

This article describes the results of multidirectional research on producing new polyurethane materials modified with grain fraction of fly ashes. As a result of the conducted research, new polyurethane-polyisocyanurate foams were produced, which contained 5% to 35% of a microsphere in relation to its mass. Examinations on mechanical and thermal properties, as well as flammability, were conducted. The increasing content of aluminosilicate microspheres in rigid polyurethane-polyisocyanurate foams increased the apparent density of these materials. Based on the results, it was determined that the use of the microsphere in the recipe for producing polyurethane-polyisocyanurate foams is very advantageous. The obtained rigid foams are characterized by lower brittleness, higher compressive strength, higher closed cell count, as well as significantly lower flammability in relation to the reference foam (not modified with the filler).