Novel bio-based polyols for flame retardant polyurethane sealants

Novel ricinoleic acid (RA) based phosphorus and nitrogen-containing flame retardant polyols (FRPE) were successfully synthesised and characterised by FTIR, 1H NMR and 13C NMR.Chinese researchers developed bio-based polyols for flame retardant polyurethane sealants.

The flame retardant polyurethane sealants (FR-PUS) were prepared by curing FRPE with methylene diphenyl diisocyanate (MDI-50). The flame retardant properties and thermal decomposition of FR-PUS were investigated by the limiting oxygen index (LOI), cone calorimeter testing (CCT) and thermogravimetric analysis (TGA).

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FRPE improve flame retardancy. The results showed that FRPE could enhance the thermal stability and improve the flame retardancy of polyurethane sealants (PUS) without any other flame retardant. Moreover, the gaseous degradeation products of FR-PUS were analysed by thermogravimetric analysis/infrared spectrometry (TG-IR), providing insight into the thermal degradation mechanism. FTIR and dynamic mechanical analysis (DMA) were used to explore the chemical components of the char after CCT and mechanical properties of PUS. ,;The study is published in: Polymer Degradation and Stability.

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