A type of dicyclic phosphate flame retardant:bis((5-ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl)methyl) methylphosphonate was synthesized from trimethylol propane and dimethyl methylphosphonate catalyzed by ionic liquid [Bmim]BF4.The reaction process was tracked by gas chromatography,and the product was purified by column chromatography to characterize the product structure.When the bicyclic phosphonate flame retardant was added at 25%,the limiting oxygen index value of flame retardant rigid polyurethane foam increased from 18.8% to 26.6%,and the maximum thermal decomposition rate decreased from 6.48%·min-1 to 4.40%·min-1.The activation energies of thermal decomposition of rigid polyurethane foam and flame retardant rigid polyurethane foam were calculated by Kissinger method and Flynn-wall-Ozawa method,respectively,and the thermal decomposition mechanism was analyzed based on the calculation results.
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