Preparation and characterization of rigid polyurethane foams with carbamide and borate groups

The results of research on the application of hydroxyethyl urea derivatives modified with boron as polyol components to produce foamed polyurethane materials are presented. The obtained rigid polyurethane foams are characterized by good heat‐insulating parameters and decreased flammability. The decrease in flammability of the foams follows from the presence of boron and increased nitrogen content, resulting from the use of polyol with urea groups. The incorporation of boron into the foam structure also results in a substantial increase in the compression strength, compared to classic foams and to non‐boron‐modified ones. The self‐extinguishing foams of high mechanical strength can find application as heat‐insulating construction elements for the building industry.