加工热历史对线性低密度聚乙烯性能的影响  

Effect of Processing Times on the Performance of Linear Low Density Polyethylene

作　　者：胡琬琪 郑义 蒋霞 向小亮 Hu Wanqi;Zheng Yi;Jiang Xia;Xiang xiaoliang(College of Innovation and Entrepreneurship,Huaihua Uninversity,Huaihua418000,China;College of Chemical and Materials Engineering,Huaihua Uninversity,Huaihua418000,China;College of Biological and Food Engineering,Huaihua University,Huaihua418000,China)

机构地区：[1]怀化学院创新创业学院,湖南怀化418000 [2]怀化学院化学与材料工程学院,湖南怀化418000 [3]怀化学院生物与食品工程学院,湖南怀化418000

出　　处：《山东化工》2022年第16期23-26,共4页Shandong Chemical Industry

基　　金：湖南省科技创新计划资助(项目编号:2021RC1015);国家级大学生创新创业训练计划项目(项目编号:202110548016);聚乙烯醇纤维材料制备技术湖南省工程实验室开放项目(HGY201814);聚合物资源绿色循环利用教育部工程研究中心2021年度开放课题项目:废旧蓄电池外壳聚丙烯回收料的增韧改性研究;怀化学院科研项目(HHUY2019-19)。

摘　　要：以线性低密度聚乙烯(LLDPE)为研究对象,采用双螺杆挤出机对其进行多次挤出加工,经多次热加工,运用万能拉力试验机、熔体流动速率仪(MFR)、傅里叶红外光谱仪(FTIR)、差示扫描量热仪(DSC)、热重分析仪(TG)对LLDPE新料和再生料进行测定与比较分析。结果表明:LLDPE经多次挤出加工后,LLDPE在IR波长1700 cm^(-1)(酮羰基伸缩振动)附近的吸收峰,随着加工次数的增加向高波数移动,强度也越来越大;多次加工后的LLDPE的拉伸强度、断裂伸长率明显下降;材料在加工过程中发生交联反应而使得流动性变差,但也因此使得模量、熔融温度、热稳定性等性能提高。Taking linear low-density polyethylene(LLDPE)as the research object,it is extruded multiple times using a twin-screw extruder,after multiple thermal processing.A universal tensile testing machine,melt flow rate meter(MFR),Fu Fourier Infrared Spectrometer(FTIR),Differential Scanning Calorimeter(DSC),Thermogravimetric Analyzer(TG)were used to measure and compare LLDPE new and regenerated materials.The results show that after multiple extrusion processing of LLDPE,the absorption peak of LLDPE near the IR wavelength of 1700 cm-1(ketocarbonyl stretching vibration)moves to a higher wave number as the number of processing increases,and the intensity becomes greater;After the secondary processing,the tensile strength and elongation at break of the LLDPE decrease significantly;the material undergoes a cross-linking reaction during processing,which makes the fluidity worse,but it also improves the modulus,melting temperature,thermal stability and other properties.

关 键 词：线性低密度聚乙烯 热加工 热稳定性能 力学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] O656[理学—分析化学]