A facile, environmentally and friendly flame-retardant: Synergistic flame retardant property of polyurethane rigid foam

摘要

In this work, aluminum diethylphosphite (ADPO(2)) and expandable graphite (EG) exhibited synergistic effect and were introduced into polyurethane to improve the flame retardancy and thermal behavior. The structures were confirmed more denser than when added into either of the two. Additionally, the thermal performance and combustion behaviors of flame-retardant polyurethane were evaluated that when the ratio of ADPO(2) to EG was 1:2, the flame-retardant performance was better than that achieved at a ratio of 2:1; Finally, the thermodynamic properties could demonstrate that when the ADPO(2)-to-EG ratio was 1:2 (ADPO(2)5g and EG10g), the heat release rate (HRR) was 125 kW/m(2), the lowest of all values, and was nearly half of the value without adding flame retardants. (C) 2020 Published by Elsevier B.V.