Abstract:

Hexaphenoxycyclotriphosphazene（HPCTP）was synthesized by the reaction of crude hexachlorocyclotriphosphazene（HCCTP） with phenol and sodium hydroxide，with tetrabutylammonium chloride（TBAC） as phase transfer catalyst and chlorobenzene/water as solvent. Effects of reaction temperature， reaction time， solvent and molar ratio of raw materials on the yield of HPCTP were investigated. Under the optimized reaction conditions of n(sodium hydroxide)∶n(phenol)∶n(TBAC)∶n(crude HCCTP)=7.5∶6.3∶0.15∶1， reaction time of 4 h at 30 ℃ plus 6 h at reflux temperature， the yield was 75%. The product was characterized by FTIR， 1H NMR， 13C NMR， 31P NMR， XRD， DSC and TGA. The product has been firstly applied in benzoxazine resin glass cloth laminate. The flammability class of the laminate was in the rank of V-0， the breakdown voltage of the laminate was 47 kV, and the thermal state flexural strength of the laminate was 596 MPa when the mass fraction of HPTCP in the laminate was 10%.

Key words: hexaphenoxycyclotriphosphazene, flame retardant, laminate, synthesis；application