Effect of flame retardants on mechanical and thermal properties of bio-based polyurethane rigid foams

Abstract

scanning electron microscopy (SEM). With the increase in the percentage of DOPO-HSBP added, the flame retardant property of rigid polyurethane foam (RPUF) was greatly improved. When the phosphorus-containing flame retardant DOPO-HSBP was added to 50% of the RPUF with the nitrogen-containing flame retardant T-D, the LOI value of the foam increased from 18.3 to 25.5, and the UL-94 result was classified as "V-0" with almost no effect on the mechanical properties of the RPUF. The results showed that the phosphorus and nitrogen synergistic flame retardants of DOPO-HSBP and T-D can endow excellent flame retardant properties to RPUF without affecting its mechanical properties.

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