Study on Synergistic Flame Retardancy of Fluorinated Phosphate Ionic Liquid for Flexible Polyurethane Foam

doi:10.19491/j.issn.1001-9278.2019.04.007

Abstract

Abstract: Flame-retardant flexible polyurethane composite foams (FPUF) were prepared, and the flame-retarding effects of melamine polyphosphate (MPP), expandable graphite (EG) and ionic liquid (IL) on FPUF were investigated. Moreover, the optimal mass ratio of three flame retardants was determined by oxygen index (LOI), and the effects of flame retardants on the flame retardancy and thermal stability of FPUF were analyzed by thermogravimetry and cone calorimetry (CCT). The results indicated that when the mass ratio of MPP : EG : IL was set as 7.5 : 7.5 : 2. In this case, the LOI of FPUF reached a maximum value of 27.5 vol.%. Thermal analysis showed that the char yield of FPUF with MPP/EG/IL was higher than those of pure FPUF and FPUF with MPP/EG. The CCT results demonstrated that there was a decrease in peak heat release rate, total heat, the amount of smoke released and the production rate of CO for FPUF. The carbon layer was found to become denser in the presence of ionic liquid. The combination of three flame retardants generated a synergistic effect to improve the flame retarding effect and therefore reduced the fire risk.

References

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