Synthesis and characterization of 2,4,6-tri-(O,O-dimethyphosphoryl)-1,3,5-triazine

A halogen-free intumescent flame retardant 2,4,6-tri(O,O-dimethyphosphoryl)-1,3,5-triazine was synthesized by using trimethyl phosphate and cyanuric chloride as raw materials.The effect of reaction time,temperature and amount ratio of substance on product yield was discussed.The optimal conditions for preparation of 2,4,6-tri(O,O-dimethyphosphoryl)-1,3,5-triazine were selected as follows: n(cyanuric chloride)∶n(trimethy phospite) was 1∶3.2;reaction time was 7 h at 70 ℃ and the percentage of product yield of 2,4,6-tri(O,O-dimethyphosphoryl)-1,3,5-triazine could reach 81.5%.The molecular structures of 2,4,6-tri(O,O-dimethyphosphoryl)-1,3,5-triazine was determined by means of FTIR and 1H NMR technique.