Flame Retardant Properties of Two Different Synthetic Process of Ammonium Polyphosphates

摘要

Ammonium polyphosphate (APP) produced by non-P_2O_5 process and traditional P_2O_5 process were used in the intumescent flame retardant (IFR) polypropylene (PP) composite (IFR-PP). The composite was tested by limited oxygen index (LOI) and UL-94. TGA and SEM were used to study the decomposition processes. Results showed that when the ratio of APP-II/pentaerythritol/melamine is 3/1/1, the LOI value is 33.1, and all composite could reach UL-94 V0 rating. The results showed that APP by non-P_2O_5 process had similar IFR properties as APP of traditional P_2O_5 process.