聚磷酸铵和三嗪成炭剂复合聚丙烯在水煮条件下的阻燃和力学性能

Properties and Flame-retardance of Polypropylene Composites Based on Ammonium Polyphosphate and Charring Agent System under Water Treatment

将乙二胺代三嗪成炭剂(ETCA)与聚磷酸铵(APP)复配,制备了两种不同质量分数的双组分膨胀型阻燃剂(IFR)阻燃的聚丙烯(PP)材料,分别为23%IFR/PP、27%IFR/PP。通过极限氧指数仪、UL94垂直燃烧仪、锥形量热仪、电子万能试验机和冲击试验机等分别研究了80℃热水处理7 d前后的阻燃聚丙烯复合材料的燃烧性能与力学性能。结果表明,复配膨胀型阻燃剂的加入使PP材料的阻燃性能提高,但力学性能下降;两组双组分阻燃试样23%IFR/PP、27%IFR/PP在80℃热水处理3 d能保持UL94 V-0级别,LOI分别达27.7%和29.0%,3 d之后阻燃级别降为无级别,但是7 d之后LOI值仍能达25.3%和27.0%;水煮之后,相比于未水煮阻燃试样,23%IFR/PP、27%IFR/PP的拉伸强度下降,但冲击强度增加。

In this paper,the two-component intumescent flame retardant （IFR） with different mass fraction of was obtained through the combination of ammonium polyphosphate （APP） and ethanediaminesubstitutive triazine-based charring agent （ETCA） and used in polypropylene （PP）.The flame retardancy and mechanical properties of PP composites containing 23% and 27% intumescent flame retardant by weight respectively （i.e.23% IFR/PP,27% IFR/PP） before and after 80 ℃ for 7 days water treatment were characterized by limiting oxygen index （LOI）,UL 94 vertical burning test,cone calorimeter,electromechanical universal testing machine and combined digital impact testing machine.The results showed that the intumescent flame retardant enhanced the flame retardancy of PP composites,but led to a decrease of mechanical properties.After treated by hot water for 3 days,the flame-retardant specimen sustained UL 94 flammability V-0 rating,but the LOI values of 23% IFR/PP and 27% IFR/PP reduced to 27.7% and 29.0%,respectively.Over 3 days,the flame-retardant specimens decreased to no rating and the LOI values reduced to 25.3%and 27.0%,respectively.After 80 ℃ water treatment,the tensile strength of 23% IFR/PP and 27% IFR/PP all decreased,but the impact strength all obviously increased compared with pure PP.