For the fire defects of paraffin-based form-stable phase change materials (PCM),a novel polyphosphate flame retardant (OL1001) was adopted. The influences of OL1001 and diethylaluminum phosphite (ADP) on the flame retardancy of form-stable PCM (high-density polyethylene/paraffin) were also studied. Meanwhile,the free radical catcher NOR116 was introduced to study the effects of three flame retardants on the flame retardancy,thermstability,heat storage and leakage properties of form-stable PCM in different proportions,and the flame retardancy mechanism was explored. The combustion results show that when the mass ratio of ADP:OL1001:NOR116 is 16:8:1 with a total addition amount of 23％,PCM could achieve a V-2 rating (0. 8 mm) and its LOI could reach 25. 1％,it also has good thermal stability and char formation performance. DSC test shows that the heat storage performance of the flame-retardant PCM could reach 91. 4 J/g,revealing a good heat storage performance. The thermal degradation kinetics shows that the apparent activation energy is increased to 83. 4 kJ/mol,and the thermal stability of the material is significantly improved after the system is introduced. Leakage test shows that the flame-retardant PCM material has no leakage below 70 ℃ . The mechanical test results show that the flame-retardant system has a small adverse effect on the mechanical properties of PCM materials. Scanning electron microscope (SEM) shows that the system forms a stability char layer in the condensed phase.
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