聚焦磷酸哌嗪对聚丙烯材料燃烧性能的影响及其阻燃机理研究

通过两步反应,合成了聚焦磷酸哌嗪(PAPP)。将其应用到聚丙烯中,探究了PAPP对PP材料阻燃性能和热稳定性能的影响。燃烧性能测试显示,随着PAPP添加量的增加,PP/PAPP复合材料的极限氧指数(LOI)逐渐上升,PP/PAPP30复合材料达到V-0级。热失重测试(TG)显示,在高温区,PP/PAPP复合材料在N2和空气下均表现出较好热稳定性能。扫描电镜测试(SEM)显示,随着PAPP添加量的增加,材料燃烧后炭层的致密程度显著上升,可以有效地抑制热量和氧气的传输。能谱分析(EDS)显示,复合材料燃烧后炭层的形成主要是由于PAPP分解出的含P类物质促进所致。差示扫描量热测试(DSC)显示,随着PAPP添加量的增加,复合材料的结晶性能有一定程度的降低。力学性能测试表明,PAPP对材料断裂伸长率的影响更为明显。

Effect of Piperazine Polypyrophosphate(PAPP) on the Combustion Performance of Polypropylene Material and Its Flame Retardant Mechanism Research

The flame retardant piperazine polypyrophosphate(PAPP) was synthesized through two steps reaction. The flame retardancy and thermal stability of PP/PAPP materials was studied. The combustion performance test showed that with the increase of the adding amount of PAPP, the limited oxygen index(LOI) of PP/PAPP composites gradually increased, and the PP/PAPP30 composites reached the V-0 level. The thermal gravity(TG) analysis showed that at high temperature, PP/PAPP composites show better thermal stability in both N2 and air. The scanning electron microscope(SEM) test showed that with the increase of the adding amount of PAPP, the denseness of the carbon layer increased significantly after the material was burned, which could effectively inhibit the transmission of heat and oxygen. The energy dispersive spectrum(EDS) analysis showed that the formation of the carbon layer after the combustion of the composite was mainly due to the promotion of the P-containing substances decomposed by PAPP. The differential scanning calorimetry(DSC) showed that with the increase of the adding amount of PAPP, the crystalline properties of the composites decreased to a certain extent. The mechanical property test showed that the effect of PAPP on the elongation at break of the material was more obvious.