Flame retardant phosphoryl melamine compound and preparation method thereof

The invention relates to a flame retardant phosphoryl melamine compound and a preparation method thereof, the structure of the compound is shown in the following formula: the preparation method comprises the following steps: in an organic solvent, reacting melamine sodium salt with 1-1.1 times of mole of phosphorus oxychloride, and purifying to obtain phosphoryl melamine. The compound disclosed by the invention is stable in structure, high in flame-retardant efficiency, good in expansion charring property and wide in application range, and can be used as a flame retardant of materials such as epoxy resin, unsaturated polyester resin and polyvinyl alcohol; the flame retardant can also be used as a flame retardant for wood, cotton, hemp, paper, cellulose and the like; the process is simple, equipment investment is low, and industrial production is easy to realize. 本发明涉及一种阻燃剂磷酰密胺化合物及其制备方法，该化合物的结构如下式所示：制备方法为：在有机溶剂中，三聚氰胺钠盐与1～1.1倍摩尔的三氯氧磷反应，经纯化处理，得磷酰密胺。本发明化合物结构稳定、阻燃效能高、膨胀成炭性好，应用范围广，可以用作环氧树脂、不饱和聚酯树脂、聚乙烯醇等材料的阻燃剂；也可用作木