阻燃ABS复合材料的制备及热分解性能

以阻燃齐聚物(PSPTR)和酚醛树脂(PF)作为膨胀型阻燃剂(IFR)阻燃丙烯晴-丁二烯-苯乙烯共聚物(ABS), 通过极限氧指数(LOI)和水平垂直燃烧(UL-94)测试研究了阻燃PSPTR-PF/ABS体系的阻燃性能。研究表明, 当PSPTR:PF=1:1(质量比), 总质量分数为30%时, 体系的LOI为28.2%, UL-94达V-1级别。采用热重-红外联用(TG-IR)技术探索了阻燃体系的热性能和热分解历程, 发现PSPTR-PF阻燃剂的加入延缓了ABS的热分解, 提高了ABS的热稳定性能。采用SEM、 XRD和Raman光谱分析了燃烧炭层的形貌和结构。结果表明, PF不仅改善了炭层的致密度, 而且完善了炭层的石墨结构, 最终提高了ABS的阻燃性能。

Preparation and properties of flame retarded ABS composites

A new intumescent flame retardant (IFR) system, which was composed of a flame retardanted oligomer (PSPTR) and phenol formaldehyde resin (PF), was used to impart flame retardancy for ABS resin. The flammability properties of PSPTR-PF/ABS composites were investigated by limiting oxygen index (LOI) and vertical burning test (UL-94), respectively. The results show that the LOI value of PSPTR-PF/ABS composites reach 28.2, and UL-94 reached V-1 rating when the total addition mass fraction is 30%, in which the mass ratio of PSPTR to PF is 1:1. The thermal property and degradation processes of ABS and PSPTR-PF/ABS composites were studied by thermogravimetric analysis-infrared spectrometry (TG-IR) in detail. In addition, the morphology and structure of char layer were characterized by SEM, XRD and Raman spectra. The results demonstrate that PF can improve the compactness and graphite structure of intumescent char layer, which can increase the flame retardant performance of ABS eventually.