近红外光谱结合偏最小二乘回归法快速无损测定高密度聚乙烯的熔体流动速率  

Rapid nondestructive testing of melting flow rate of high-density polyethylene by near-infrared spectroscopy and partial least squares regression method

作　　者：李延[1] 钟名丽 辛明东 翟德宏 崔嘉敏[1] 张建平[1] 李玮[2] 赵秀娟[2] LI Yan;ZHONG Ming-li;XIN Ming-dong;ZHAI De-hong;CUI Jia-min;ZHANG Jian-ping;LI Wei;ZHAO Xiu-juan(Research Institute,Lanzhou 730060,LanzhouPetrochemical Company,PetroChina,China;Yulin Chemical Co Ltd,Yulin 719111,LanzhouPetrochemical Company,PetroChina,China)

机构地区：[1]中国石油兰州石化公司研究院,甘肃兰州730060 [2]中国石油兰州石化公司榆林化工有限公司,陕西榆林719111

出　　处：《石化技术与应用》2024年第6期469-472,484,共5页Petrochemical Technology & Application

基　　金：中国石油兰州石化公司资助项目(项目编号:LZSH 202221)。

摘　　要：选择使用多元散射校正(MSC)、一阶导数(D 1)、二阶导数(D 2)、卷积平滑(Savitzky-Golay)等方式对3个牌号高密度聚乙烯(HDPE)粉料样本的近红外光谱进行预处理,使其经预处理后的近红外光谱与相应牌号熔体流动速率(MFR)之间的关联性良好;然后,采用偏最小二乘回归法拟合,建立相应匹配HDPE牌号的MFR定量分析模型,旨在实现快速无损检测。结果表明:上述近红外光谱结合偏最小二乘回归法所建立的匹配于相应3种HDPE粉料的MFR定量分析模型的测试结果均具有很好的复现性,牌号1、牌号2、牌号3的MFR标准偏差依次为0.0158,0.0147,0.0006 g/min,而且该方法快速测定得到的MFR与GB/T 3682.2—2018标准方法测定的均相近。Methods such as multiple scattering correction(MSC),first derivative(D1),second derivative(D2),and convolution smoothing(Savitzky-Golay)were chosen to preprocess the near-infrared(NIR)spectra of three grades of high-density polyethylene(HDPE)powder samples,so that the correlation between the preprocessed NIR spectra and the melt flow rate(MFR)of the corresponding HDPE grade was good.Then,the MFR quantitative analysis model matching HDPE grade was established by coupling with partial least squares regression(PLSR)method to achieve rapid nondestructive testing.The results indicated that the test results from above corresponding MFR quantitative analysis models matching above three grades of HDPE powders established by NIR spectroscopy coupling with PLSR method had good reproducibility,and MFR standard deviation of HDPE Grade 1,Grade 2 and Grade 3 was 0.0158,0.0147,0.0006 g/min,respectively.Moreover,the MFR obtained by such rapid testing were similar to those determined by GB/T 3682.2—2018 standard method.

关 键 词：高密度聚乙烯 熔体流动速率 近红外光谱 定量分析模型 快速无损检测 偏最小二乘回归法 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] O657.3[理学—分析化学]