采用二乙基次磷酸铝(AlPi)复配超支化三嗪大分子成炭剂(EA)对聚对苯二甲酸丁二醇酯(PBT)进行无卤阻燃改性.通过氧指数、UL-94垂直燃烧及锥形量热测试研究了阻燃体系的阻燃性能,通过热失重分析(TGA)研究了复配阻燃体系的热性能,采用扫描电镜(SEM)观察阻燃体系燃烧炭层的形貌.研究表明,AlPi 与EA复配比例为7∶3时阻燃效果最好,材料氧指数达到34．6％,通过 UL-94 V-0级,热释放速率峰值(PHRR)降低至653 kW/m2；热重分析表明,复配阻燃体系的加入促进了PBT的提前分解成炭,增加了阻燃PBT的残炭量；燃烧炭层扫描电镜说明,复配阻燃体系能形成连续致密的膨胀炭层,提高阻燃效果.
Flame-retardant poly(butylene terephthalate)(PBT)composites had been prepared by combination of aluminium diethlyphosphinate (AlPi)and hyperbranched derivative of triazine group (EA).The flame retardan-cy of the composites was investigated by limiting oxygen index (LOI),UL-94 vertical burning test and Cone calorimeter tests.The thermal behaviors were investigated by thermogravimetric analysis (TGA).Morphology of char combustion of flame-retardant PBT was observed by SEM.The results show that when the mass ratio of AlPi and EA is 7∶3,flame-retardant effect of composites is best,with an increased LOI value (32.6%),a UL-94 V-0 rating and a decreased HRR value (653 kW/m2 ).The analysis of thermal decomposi tion shows that the addition of AlPi and EA results in an earlier char formation process during fire tests and the synergistic effect increase the char residue.The SEM of char layer shows that a dense and compact intumescent char layer has been formed by the synergism between AlPi and EA,and then the flame-retardant effect is improved.
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