木质素基成炭剂的制备及在膨胀阻燃聚丙烯的应用  

Preparation of Lignin-Based Char-Forming Agent and Its Application in Intumescent Flame Retardant Polypropylene

作　　者：杨晓涵 宋艳 林肯 李锦春 Xiaohan Yang;Yan Song;Ken Lin;Jinchun Li(School of Material Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164

出　　处：《高分子材料科学与工程》2022年第12期39-46,共8页Polymer Materials Science & Engineering

基　　金：江苏省科技厅产学研联合创新资金(BY2019080);国家自然科学基金资助项目(51473024)。

摘　　要：以碱木质素为模板、γ-甲基丙烯酰氧基丙基三甲氧基硅烷为改性剂,一步法合成了含有硅元素和碳碳双键等结构的木质素基成炭剂(MLig)。热失重分析结果表明,MLig具有较好的热稳定性能及成炭能力,明显优于未改性碱木质素。将MLig作为成炭剂,用于制备膨胀阻燃聚丙烯复合材料(MLig/IFR/PP),通过极限氧指数测定仪、垂直燃烧测定仪、热失重分析仪和电子万能试验机等分别对阻燃聚丙烯的阻燃性能、热稳定性能、力学性能等进行了研究。结果表明,当阻燃剂质量分数为30%、MLig与季戊四醇质量比为1:3时,MLig/IFR/PP的极限氧指数(LOI)值可达32%,UL-94垂直燃烧过V-0级,明显优于含未改性木质素膨胀阻燃聚丙烯(Lig/IFR/PP);同时,当阻燃剂质量分数降至25%时,MLig/IFR/PP的阻燃性能仍优于含30%阻燃剂的Lig/IFR/PP。此外,与Lig/IFR/PP相比,MLig/IFR/PP的热稳定性能和力学性能均得到了改善,其中冲击强度提升了80%以上。The lignin-based char-forming agent(MLig)containing silica element and carbon-carbon double bond was successfully synthesized in one step using alkali lignin as template andγ-methacryloxypropyl trimethoxy silane as modifier.The results of thermogravimetric analysis(TGA)show that MLig has the better thermal stability and charring ability,which is significantly better than the unmodified alkali lignin.MLig was used as car-forming agent for the preparation of intumescent flame retardant polypropylene composites(MLig/IFR/PP).The flame retardancy,thermal stability and mechanical properties of flame retardant polypropylene were investigated by limiting oxygen index analyzer,vertical burning analyzer,thermogravimetric analyzer and electronic universal analyzer.The results show that when the mass fraction of flame retardant is 30%and the mass ratio of MLig to pentaerythritol is 1:3,the limiting oxygen index(LOI)value of MLig/IFR/PP could reach 32%and vertical burning UL-94 is over V-0 rating,which are significantly better than intumescent flame retardant polypropylene with unmodified lignin(Lig/IFR/PP).Meanwhile,the flame retardancy of MLig/IFR/PP is still better than Lig/IFR/PP with 30%flame retardant when the total mass fraction of flame retardant added is reduced to 25%.In addition,the thermal stability and mechanical properties of MLig/IFR/PP are improved compared with Lig/IFR/PP,in which the impact strength is improved by more than 80%.It can be seen that the lignin-based car-forming agent has good application prospects in the field of intumescent flame retardant polymers.

关 键 词：碱木质素 成炭剂 聚丙烯 阻燃性能 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]