Effect of 6-Methyluracil Lanthanum on Thermal Stability of PVC

Jin-gang ZHAO; Jun-wei FAN; Zhao-gang LIU; Ming-guang CHEN; Xu-bo HUANG; Yu-xuan YANG; Yan-hong HU; Jin-xiu WU

doi:10.14028/j.cnki.1003-3726.2022.09.006

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Effect of 6-Methyluracil Lanthanum on Thermal Stability of PVC

更新时间：2022-09-09

- Effect of 6-Methyluracil Lanthanum on Thermal Stability of PVC
- Polymer Bulletin Vol. 35, Issue 9, Pages: 42-51(2022)
- 作者机构：
  
  1.内蒙古科技大学材料与冶金学院,包头 014010
  2.轻稀土资源绿色提取与高效利用教育部重点实验室,包头 014010
  3.内蒙古自治区稀土湿法冶金与轻稀土应用重点实验室,包头 014010
  4.包头稀土研究院,包头 014010
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2022.09.006
  CLC：
- Published：20 September 2022，
  
  Received：14 May 2021，
  
  Revised：28 January 2022，
扫描看全文
Jin-gang ZHAO, Jun-wei FAN, Zhao-gang LIU, Ming-guang CHEN, Xu-bo HUANG, Yu-xuan YANG, Yan-hong HU, Jin-xiu WU. Effect of 6-Methyluracil Lanthanum on Thermal Stability of PVC. [J]. Polymer Bulletin 35(9):42-51(2022)
DOI：

Jin-gang ZHAO, Jun-wei FAN, Zhao-gang LIU, Ming-guang CHEN, Xu-bo HUANG, Yu-xuan YANG, Yan-hong HU, Jin-xiu WU. Effect of 6-Methyluracil Lanthanum on Thermal Stability of PVC. [J]. Polymer Bulletin 35(9):42-51(2022) DOI： 10.14028/j.cnki.1003-3726.2022.09.006.

摘要

用复分解法

以硝酸镧、6-甲基尿嘧啶(MUA)、氨水为原料制备了6-甲基尿嘧啶镧(LMUA)

利用红外光谱、热分析和元素分析对产物进行表征

确定其分子式为La(C5H4N2O2)NO3·1.5H2O。通过刚果红试纸法、高温老化实验和电导率实验

研究了LMUA对聚氯乙烯(PVC)的热稳定性能的影响

结果表明

LMUA 单独作为PVC热稳定剂时

其热稳定性和抗变色性出色

静态热稳定时间达到了73min

动态热稳定时间为 88min。将LMUA与其他热稳定剂联合进行二元和三元复配

产物的协同作用良好

稳定性有所提升。当复合稳定剂按质量比6-甲基尿嘧啶镧∶硬脂酸钙∶季戊四醇=3∶1∶1进行复配时

静态热稳定间达到88min

抗变色性和热稳定性最佳。LMUA可以与PVC降解过程中产生的HCl反应而生成LaCl3

降低了HCl对PVC降解的催化作用

从而达到增强PVC热稳定性能的目的。

Abstract

Using the double replacement reaction

lanthanum nitrate

6-methyluracil (MUA)

and ammonia water were used as raw materials to prepare 6-methyluracil lanthanum (LMUA). The product was characterized by infrared spectroscopy

thermal analysis and elemental analysis. The molecular formula is determined to be La(C5H4N2O2)NO3· 1.5H2O. Through the Congo red experiment

high temperature aging experiment and electrical conductivity experiment

the effect of LMUA on the thermal stability of PVC was studied. The results showed that when LMUA alone was used as a heat stabilizer for PVC

its thermal stability and discoloration resistance performed excellent

the static thermal stability time reached 73min

and the dynamic thermal stability time reached 88min. Combining LMUA and other heat stabilizers for binary

ternary and quaternary compounding

not only the synergy of the product was good

but also the stability was improved. When the composite stabilizer is compounded according to the mass ratio of LMUA∶CaSt2∶pentaerythritol= 3∶1∶1

the static thermal stability interval reaches 88min

and the discoloration resistance and thermal stability are the best. The light stability was analyzed by ultraviolet absorption spectrophotometry

which preliminarily verified that LMUA has light stabilization effect. LMUA can react with the HCl generated during the degradation of PVC to generate LaCl3

which reduces the catalytic effect of HCl on the degradation of PVC

thereby achieving the purpose of enhancing the thermal stability of PVC.

关键词

稀土聚氯乙烯热稳定性能6-甲基尿嘧啶镧复配

Keywords

Rare earthPolyvinyl chlorideThermal stability6-Methyluracil lanthanumCompound

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Related Institution

Baotou Research Institute of Rare Earth

School of Chemistry and Chemical Engineering, Nanchang University

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University

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Academy of Material and Chemical Engineering,Henan Institute of Engineering

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