Thermal Insulation Products Based on Modified Polyurethane Foam with Fire-Resistant Coating

Abstract

As part of the study, thermal insulation products based on rigid polyurethane foam (PPU) with a reduced flammability group were obtained. The effect of modification of polyurethane foam with oxidized thermally expansive graphite (OTG) on physical, mechanical and fire hazard properties was studied. A two-component factory-ready system with a G4 flammability group was used as the initial composition for modification. OTG brand: KR 350-80 was used as a modifier, characterized by a degree of expansion of at least 370 ml/g, a temperature of the onset of expansion of 170°C. Products made from polyurethane foam were modified by the method of dispersing OTG in a reactive composition, as well as by applying a fire-retardant coating during injection molding of masses. Samples were made and tests were carried out to determine the flammability group in accordance with GOST 30244. It was established that an increase in the concentration of OTG in the fire retardant coating and the structure of the material reduces the flammability of products, while modification by the dispersion method makes it possible to obtain a material with a flammability group (G3), but has an effect on the technological properties of the initial composition, leads to an increase in the viscosity of the reactive composition and an increase in the density of the products, while the modification of the fire retardant coating with honey does not affect the technological and physical-mechanical properties of the final product, and makes it possible to obtain a flammability group G1–G2 depending on the concentration of OTG.