中国塑料 ›› 2025, Vol. 39 ›› Issue (12): 92-98.DOI: 10.19491/j.issn.1001-9278.2025.12.015

• 助剂 • 上一篇    下一篇

肌氨酸插层镁铝镧水滑石用作PVC热稳定剂的研究

段金胜1,2,3, 柳召刚1,2,3(), 李沂霖1,2,3, 贾培杰1,2,3, 吴书欣1,2,3   

  1. 1.内蒙古科技大学稀土产业学院,包头 014010
    2.内蒙古科技大学轻稀土资源绿色开采与高效利用重点实验室,包头 014010
    3.内蒙古科技大学稀土湿法冶金与轻稀土应用重点实验室,包头 014010
  • 收稿日期:2025-01-11 出版日期:2025-12-26 发布日期:2025-12-22
  • 通讯作者: 柳召刚(1965-),男,教授,从事稀土湿法冶金及轻稀土的应用,Liuzg65@163.com
    E-mail:Liuzg65@163.com

Study on methylglycine⁃intercalated Mg⁃Al⁃La layered double hydroxides as efficient thermal stabilizers for PVC

DUAN Jinsheng1,2,3, LIU Zhaogang1,2,3(), LI Yilin1,2,3, JIA Peijie1,2,3, WU Shuxin1,2,3   

  1. 1.School of Rare Earth Industry,Inner Mongolia University of Science and Technology,Baotou 014010,China
    2.Key Laboratory of Green Extraction and Efficient Utilization of Light Rare Earth Resources,School of Rare Earth Industry,Inner Mongolia University of Science and Technology,Baotou 014010,China
    3.Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Application,School of Rare Earth Industry,Inner Mongolia University of Science and Technology,Baotou 014010,China
  • Received:2025-01-11 Online:2025-12-26 Published:2025-12-22
  • Contact: LIU Zhaogang E-mail:Liuzg65@163.com

摘要:

通过共沉淀⁃水热法制备镁铝镧水滑石(MgAlLa⁃LDHs)及其肌氨酸插层铝镧水滑石(MgAlLa⁃N⁃LDHs),并研究其对PVC性能的影响。结果表明,肌氨酸改性后,水滑石层间距显著增大,分散性提高;MgAlLa⁃N⁃LDHs具有更优异的热稳定性能;其在PVC基体中表现出良好的相容性,复合材料的拉伸强度和断裂伸长率显著增强;改性稀土水滑石提高了PVC的热稳定性;静态与动态热稳定性测试进一步证实了其对PVC降解的显著抑制作用,有效延长了材料的使用寿命;综合性能评估显示,MgAlLa⁃N⁃LDHs可作为高效环保型PVC热稳定剂,为其实际应用提供了理论和实验支持。

关键词: 水滑石, 聚氯乙烯, 热稳定剂, 稀土, 插层

Abstract:

Magnesium⁃aluminum⁃lanthanum layered double hydroxides (MgAlLa⁃LDHs) and their methylglycine⁃intercalated counterparts (MgAlLa⁃N⁃LDHs) were synthesized via a coprecipitation⁃hydrothermal method. The methylglycine intercalation was confirmed by XRD and SEM, which revealed an increased interlayer spacing and a more exfoliated morphology. TGA demonstrated that the modification significantly enhanced the intrinsic thermal stability of the LDHs. When incorporated into PVC, the MgAlLa⁃N⁃LDHs exhibited excellent matrix compatibility, leading to a simultaneous improvement in tensile strength and elongation at break. Moreover, the modified LDHs substantially improved the thermal stability of PVC, as evidenced by increased thermal degradation activation energy and extended stability times in both static and dynamic tests. These results are attributed to the synergistic effect of the rare⁃earth elements and the intercalated methylglycine, which effectively inhibit the degradation of PVC. The methylglycine⁃intercalated MgAlLa⁃LDHs thus present a highly effective and environmentally friendly solution for enhancing PVC's service life, offering strong theoretical and experimental support for their industrial application.

Key words: layered double hydroxides, polyvinyl chloride, thermal stability, rare earth, intercalation

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