Preparation method and application of flame retardant containing phosphorus, nitrogen and boron

The invention discloses a preparation method and application of a flame retardant containing phosphorus, nitrogen and boron. The structural formula of the flame retardant containing phosphorus, nitrogen and boron is as described in the specification. One end of the molecular structure of the flame retardant containing phosphorus, nitrogen and boron prepared by the invention contains DOPO; DOPO hasgood solubility in a polymer matrix and can improve the compatibility of the flame retardant with the polymer matrix; and contained NH- groups may participate in curing, so prepared flame-retardant epoxy resin can maintain good transparency and mechanical properties. 本发明公开了一种含磷氮硼阻燃剂的制备方法及其应用，该含磷氮硼阻燃剂的结构式为本发明制得的含磷氮硼阻燃剂的分子结构的一端含有DOPO，DOPO在高分子基体中具有较好的溶解性，可以提高阻燃剂与高分子基体的相容性，所含NH-基团可能参与固化，使所制备的阻燃环氧树脂能保持较好的透明性与机械性能。