乙二醇法提取棉秆木质素及其对聚丙烯抗氧化性能的影响  

Extraction of Lignin from Cotton Straw by Ethylene Glycol Method and Its Effect on Antioxidant Properties of Polypropylene

作　　者：徐卉桐 吴磊[1] 古丽美合日·艾散 丁李杰 谭煜 买买提江·依米提[1] 孔德智 Huitong Xu;Lei Wu;Gvlmira Hasan;Lijie Ding;Yu Tan;Mamatjan Yimit;Dezhi Kong(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12期63-70,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21764013)。

摘　　要：为减缓废弃棉秆造成的环境压力,提高棉秆副产物的综合利用,采用乙二醇溶剂分离棉秆中的木质素,研究了各种因素对其分离效果的影响,并分析提取物的各项性能及其对PP抗氧能力的影响。结果表明,在160℃用0.8 mol/L的乙二醇溶液对棉秆处理1 h可达到最高产率84.58%;木质素改性对PP的结晶性能及熔融和结晶温度影响不大,但是对其氧化诱导时间、流变性能和力学性能产生影响:当在PP中添加质量分数0.5%的木质素,氧化诱导时间相较纯PP试样提高38.3%,微量混合流变测试中剪切扭矩提高了25.58%,断裂伸长率降低9.34%、冲击强度无变化。说明乙二醇法提取的木质素在PP中能够有效发挥抗氧化效果。To alleviate the environmental pressure caused by waste cotton straw and improve the utilization of cotton straw by-products,ethylene glycol solvent was used to separate lignin from cotton straw,the effects of various factors on its separation effect were studied,and the properties of the extract and its effect on the antioxidant capacity of polypropylene(PP)were analyzed.The results show that the highest yield of 84.58% could be achieved by treating cotton straw with 0.8 mol/L ethylene glycol solution for 1 h at 160℃.The lignin modification has little effect on the crystallization properties,and melting and crystallization temperatures of PP,but has an effect on its oxidation induction time,rheological properties,and mechanical properties.When 0.5% of lignin was added to PP,the oxidation induction time is increased by 38.3% compared with that of pure PP,the shear torque is 25.58% higher in micro mixing rheological test,the elongation at break is 9.34% lower,and the impact strength has no change,indicating that the lignin extracted by ethylene glycol method can effectively exert an antioxidant effect in PP.

关 键 词：木质素 聚丙烯 抗氧化 氧化诱导时间 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]