膨胀型阻燃聚丙烯/La_2O_3复合材料的阻燃性能及机理  

Flame Retardant Properties and Mechanism of Intumescent Flame Retardant Polypropylene/La_2O_3Composites

作　　者：冯才敏[1] 梁敏仪[1] 黄健光[1] 刘洪波[1] 

机构地区：[1]顺德职业技术学院应用化工技术系,广东佛山528333

出　　处：《高分子材料科学与工程》2013年第6期92-95,100,共5页Polymer Materials Science & Engineering

摘　　要：采用多聚磷酸蜜胺(MPP)和笼状季戊四醇磷酸酯(PEPA)复配成膨胀型阻燃剂,氧化镧(La2O3)为阻燃协效剂,制备了阻燃性能良好的膨胀型阻燃聚丙烯复合材料(PP/IFR)。研究了La2O3用量对PP/IFR体系阻燃性能的影响及阻燃协同作用机理。结果表明,添加少量的La2O3可显著提高PP的阻燃性能;当La2O3质量分数为1%时,PP/IFR的氧指数高达31.0%。热重分析(TGA)、红外光谱(FT-IR)、激光拉曼光谱(LRS)分析和电子扫描显微镜(SEM)观测结果表明,添加La2O3能促进残炭转化为聚芳烃结构,形成更多的结晶碳,提高炭层的强度,并催化IFR的酯化交联反应,形成更多的P-O-P和P-O-C交联网络结构。Intumescent flame retardant polypropylene composite （PP/IFR） was prepared using melamine polyphosphate （MPP） and pentaerythritol phosphate （PEPA） as flame retardants and lanthanum oxide （La203） as synergistic agent. The effects of La2O3 content on flame retardancy and mechanism were investigated. It is found that a little amount of La2O3 can remarkably improve the flame retardance of PP/IFR. When the mass fraction of La2O3 is 1%, the LOI of flame retardant PP is 31.0 %, and passes the UL94 V-0 test. TGA, FT-IR, LRS analysis results and SEM micrographs show that La2O3 can change char into polyaromatic rings and form more graphitic carbon to improve the strength of char layer, and catalyze esterification of IFR to form more P - O - P and P - O - C connecting structure, thus the flame retardant performance of PP/IFR is enhanced.

关 键 词：氧化镧 聚丙烯 膨胀阻燃机理 多聚磷酸蜜胺 笼状季戊四醇磷酸酯 

分 类 号：TB33[一般工业技术—材料科学与工程]