In summary, PURF nanocomposites were prepared by utilizing PEPA and CaCO3 as fire retardants, and the anti-fire property was studied by evaluating the char property. The char residues of PEPA/PURFs were higher than that of pure. When 8 wt% of PEPA was added, the char residue reached 32.5% while the char residue of pure PURF was only 17.2%. PEPA and CaCO3 had good synergistic effect on improving the char stability of PURF. The char residue of PEPA/CaCO3/PURF was 29.5% in N2 environment and 26.4% in air environment, showing that only small part of char was oxidized by oxygen at high temperature.
PEPA and CaCO3 modified PURF with 10 mm in thickness could endure the impact of more than 1000 °C fire for more than 10min, which was resulted from the formation of a barrier of nanoparticle enhanced char layer on surface of the foam. The enhanced char layer had better stability and anti-oxidation property.
Acknowledgments
Financial supports by The Bayer Science & Education Foundation and Bayer-Tongji Eco-Construction & Material Academy.