多羟基结构三嗪成炭剂在膨胀阻燃PP中的应用

Application of Triazine-Based Charring Agent with Multi-Hydroxyl Group in Intumescent Flame Retardant Polypropylene

以二乙醇胺为侧链,三聚氯氰和哌嗪为主链,采用一锅法制备了一种多羟基三嗪成炭剂(CDP),将其与聚磷酸铵(APP)复配成膨胀阻燃剂(IFR)用于阻燃聚丙烯(PP)。采用垂直燃烧、极限氧指数、热失重分析等手段研究了阻燃PP的阻燃性能和热稳定性,并用扫描电子显微镜(SEM)对炭层形貌进行了研究。结果表明,APP和CDP具有良好的协同阻燃效果,当APP与CDP质量比为2∶1时,协同阻燃效果最优,仅添加20%IFR,即可使PP达到UL94V–0级别,LOI为29.5%。热失重分析表明该复合材料在800℃具有最高的残炭量,SEM也显示形成了连续致密的炭层。

A triazine-based charring agent (CDP) with multi-hydroxyl group was synthesized by using cyanuric chloride, piperazine as backbone and diethanol amine as side chain through one-spot reaction. CDP and ammonium polyphosphate (APP) were used as intumescent flame retardant (IFR) into polypropylene. The flammability and thermal stability of PP/IFR compositeswere investigated by UL94 vertical burning,limiting oxygen index (LOI) and thermogravimetric analysis tests (TGA). Scanning electron microscope (SEM) was used to study the morphology of char layer. The results suggest that good synergistic effect exists between APP and CDP. When the mass ratio of APP and CDP is 2∶1 and the total addition is 20%,the PP composite achieves the UL94 V–0 and has a LOIvalue of 29.5%. TGA results indicate that the PP composite has the highest char residues at 800℃in nitrogen atmosphere and SEM shows a continuous and dense char layer is formed.