改性木质素的制备及对聚丙烯阻燃和抗氧化性能的影响  

Preparation of Modified Lignin and Its Effect on Flame Retardant and Antioxidant Properties of Polypropylene

作　　者：丁李杰 徐卉桐 吴磊[1] 买买提江·依米提[1] Lijie Ding;Huitong Xu;Lei Wu;Mamatjian Yimit(Ministry of Education and Autonomous Region Key Laboratory of Petroleum and Natural Gas Fine Chemicals,School of Chemical Engineering,Xinjiang University,Urumqi 830046,China)

机构地区：[1]石油天然气精细化工教育部和自治区重点实验室新疆大学化工学院,新疆乌鲁木齐830046

出　　处：《高分子材料科学与工程》2022年第10期66-71,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21764013)。

摘　　要：以棉杆木质素(LG)为原料制备了尿素基改性棉杆木质素(UM-LG)、酯化木质素(EL)、间苯二胺基改性棉杆木质素(ML)3种改性棉杆木质素,并作为聚合物改性剂,添加到聚丙烯(PP)中,研究了不同改性木质素对PP阻燃和抗氧化性能的影响。结果表明,3种改性木质素对PP的阻燃和抗氧化性能都有所提升。PP中添加15%UM-LG后,与纯PP试样相比较,氧化诱导时间延长了52.9%;在200℃、螺杆转速30 r/min、回流10 min下剪切扭矩提高了50.58%。当PP中添加15%ML后,氧指数达到24.9%;从扫描电镜图中可以发现,3种改性木质素的添加使得PP在燃烧过程中形成了炭层,进一步说明,改性木质素增强了PP的阻燃性能;力学性能测试表明,由于改性木质素的添加,PP的力学性能受到一定程度的影响。Using cotton stalk lignin as raw material, three kinds of lignin, urea-based modified cotton stalk lignin,esterified lignin and m-phenylenediamine-based modified cotton stalk lignin were prepared and added to polypropylene as polymer modifier. Effects of different modified lignin on the flame retardant and antioxidant properties of polypropylene were studied. The results show that the three kinds of modified lignin improve the flame retardant and antioxidant properties of polypropylene. After adding 15% urea-based modified cotton stalk lignin to polypropylene, the oxidation induction time is increased by 52.9% compared with the pure polypropylene sample;the shear torque is increased by 50.58% at 200 °C, screw speed 30 r/min, and reflux for 10 min. However, after adding15% m-phenylenediamine-based modified cotton stalk lignin, the oxygen index reaches 24.9%. It can be found in the SEM images that the addition of modified lignin makes polypropylene form a carbon layer during the combustion process, which further demonstrate that the modified lignin enhances the polypropylene flame retardant properties.The mechanical properties results show that with the addition of modified lignin, the mechanical properties of polypropylene are affected to a certain extent.

关 键 词：棉杆木质素 聚丙烯 阻燃性 抗氧化性 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]