Bifunctional modified flame-retardant isocyanate compound and synthesis method thereof

The invention relates to a bifunctional modified flame-retardant isocyanate compound and a synthesis method thereof, and belongs to the technical field of polyurethane materials. According to the invention, phosphorus-containing dihydric alcohol synthesized by using 2-carboxyethyl phenyl hypophosphorous acid, ethylene glycol and epoxypropane as raw materials and TDI are polymerized to obtain a bifunctional modified flame-retardant isocyanate compound. The flame-retardant isocyanate compound is a modified flame-retardant isocyanate compound containing an element P, does not contain halogen, and can greatly improve the flame retardance of polyurethane foam without reducing the environmental protection index of the foam. The modified flame-retardant isocyanate compound developed by the invention does not contain halogen, is small in combustion smoke amount, does not release corrosive or irritant halogen hydride gas, does not generate toxic cancerogenic substances such as polybrominated benzoxins and polybrominat