EG和DBDPE/Sb_2O_3协同阻燃ABS的阻燃性能及机理研究

将可膨胀石墨(EG)与十溴二苯乙烷/三氧化二锑(DBDPE/Sb2O3)复配制备ABS阻燃复合材料,通过锥形量热仪和热重分析等方法研究了EG和DBDPE/Sb2O3协同阻燃ABS的燃烧性能,探讨了二者的协同阻燃机理。结果表明:与纯ABS相比,EG与DBDPE/Sb2O3共用使ABS阻燃复合材料的峰值和平均热释放速率分别下降了73.5%和63.8%,峰值质量损失速率降低52.04%,平均有效燃烧热降低19.96%,成炭量增加;EG阻燃ABS为典型的凝聚相阻燃机理,DBDPE/Sb2O3阻燃ABS为气相阻燃机理,二者并用时可以同时发挥凝聚相阻燃和气相阻燃作用,但以凝聚相阻燃机理为主;热重分析表明EG与DBDPE/Sb2O3具有协同作用,ABS分解峰的峰值热失重速率下降25.2%,二者可以互相促进ABS成炭,EG可以保护ABS成炭产物,提高实际成炭量。

Study on Flammability and Flame-retardant Mechanism of ABS Synergisticly Flame Retarded by EG and DBDPE/Sb2O3

Taking EG and DBDPE/Sb2O3 as synergistic flame retardants, the flame-retarded ABS composite was prepared. The flammability of ABS composite and the synergistic flame-retardant mechanism of EG and DBDPE/Sb2O3 were studied by CONE and TGA. The results show that: compared with pure ABS, with the addition of EG and DBDPE/Sb2O3 together, the peak heat release rate (PHRR) and mean heat release rate (MHRR) of ABS composite decrease by 73.5% and 63.8% respectively, the peak mass loss rate (PLMR) decreases by 52.04%, the mean effective heat combustion decreases by 19.96%, the char resudial increases; EG/ABS is condensed phase flame-retardant mechanism, DBDPE/Sb2O3/ABS is gas phase flame-retardant mechanism, with the addition of both EG and DBDPE/Sb2O3, the mechanism is dominated by gas phase flame-retardant mechanism; the synergistic effect of EG and DBDPE/Sb2O3 decreases the peak heat loss rate (DPK) of ABS composite by 25.2%, EG could protect the char product of ABS, and the practical char residual increases.