In this work, the
investigation mainly focused on the synergistic
effect of phosphorus-containing polyol (BHPP) and nitrogen-containing
polyol (MADP) in improving the flame retardancy of EG/rigid polyurethane
foam (RPUF). BHPP and MADP were synthesized through dehydrochlorination
and Mannich reaction, respectively. The influence of the weight ratio
of BHPP and MADP was studied by thermogravimetric analysis and limiting
oxygen index (LOI) tests. The results demonstrated that the optimal
weight percentage of BHPP and MADP in flame-retarding RPUF was 1/1.
In addition, the incorporation of expandable graphite (EG) into the
RPUF/BHPP/MADP system could greatly improve the flame-retardant properties
of RPUF composites. When the content of EG was 15 wt %, LOI value
of RPUF composites reached 33.5%. Furthermore, the value of the peak
of the heat release rate was reduced by 52.4% compared to that of
pristine RPUF. Based on the analysis and discussion, a condensed flame-retardant
mechanism was primarily proposed.
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