Fire retardant tetra(O-isopropyl-phenyl phosphinic acyl)glycoluril compound and preparation method thereof

The invention relates to a fire tetra(O-isopropyl-phenyl phosphinic acyl)glycoluril compound and a preparation method thereof. A structural formula of the compound is shown as specification. The preparation method comprises the steps of controlling a molar ratio of tetrachloroglycoluril to phenyl-phosphinic acid diisopropyl ester to be 1 : 4-1 : 6; dropwise adding phenyl-phosphinic acid diisopropyl ester to a solution of an organic solvent of tetrachloroglycoluril in four times; reacting for 5-7 h by keeping a temperature at 100 DEG C-110 DEG C; and obtaining a product of fire retardant tetra(O-isopropyl-phenyl phosphinic acyl)glycoluril after purification treatment. The compound provided by the invention is an excellent halogen-free phosphorus and nitrogen synergistic fire retardant, can be used for retardance of polyester PBT, polyester PET, polyvinyl chloride, polyurethane, an epoxy resin, an unsaturated resin, etc. The preparation method is simple in process and small in equipment investment and can easily realize industrial production.