An intumescent flame retardant (IFR) system composed of tris (2-hydroxyethyl) isocyanurate (THEIC) and ammonium polyphosphate (APP) was used to prepare high density polyethylene (HDPE) composites, and their thermal and flammability properties were studied. The limiting oxygen index of the HDPE composite containing 30 wt% of IFR with an APP: THEIC weight ratio of 3:1 (HD31) reaches 31.5%. The cone calorimeter analysis shows that the peak and average heat release rate of HD31 are reduced by 69.5% and 58.1% respectively; while the average mass loss rate is reduced by 77.2%. The thermogravimetric analysis suggests that the IFR/HDPE composites have good char forming ability. The structural analysis of the char residue shows that the intumescent char is composed of a polyaromatic structure containing nitrogen in five or six-membered ring linked to phospho-carbonaceous structure via the POC linkage, and some phosphorous degradation products containing POP structure.

用三（2-羟乙基）异氰脲酸酯（THEIC）和聚磷酸铵（APP）组成的膨胀型阻燃剂（IFR）体系制备高密度聚乙烯（HDPE）复合材料，研究了它们的热学和可燃性。包含30 wt％IFR且APP：THEIC重量比为3：1（HD31）的HDPE复合材料的极限氧指数达到31.5％。锥形量热仪分析表明，HD31的峰值和平均放热率分别降低了69.5％和58.1％。平均质量损失率降低了77.2％。热重分析表明，IFR / HDPE复合材料具有良好的炭形成能力。O C键和一些含磷降解产物的P O P结构。