Preparation of High Efficiency Halogen-Free Flame Retardant Epoxy Resin
A flame retardant epoxy resin(EP)material was prepared based on the expandable halogen-free flame retardant FRT-22P1 with focused piperazine phosphate,and its properties were tested.The results show that the addition of FRT-22P1 can significantly improve the flame retardant performance of EP.When the mass fraction of FRT-22P1 reaches 10％,the vertical combustion test(UL-94)of the material can reach the V-0 level,and the limit oxygen index(LOI)can reach 29.5％.The addition of FRT-22P1 reduces the temperature at 5％weight loss and increases the amount of residual carbon.FRT-22P1 exhibits good carbonization ability during the decomposition process.The presence of P—N—C structure in the carbon layer generated after UL-94 testing can significantly improve the stability of the carbon layer.FRT-22P1 mainly exhibits flame retardant activity in the condensed state.The low mass fraction FRT-22P1 has good compatibility with the EP matrix,and its addition increases the notch impact strength of the EP material by about 21％.
NETL
NSTL
万方数据
