中国塑料 ›› 2025, Vol. 39 ›› Issue (8): 88-93.DOI: 10.19491/j.issn.1001-9278.2025.08.014

• 助剂 • 上一篇    下一篇

不同种类偶联剂表面改性水滑石对PVC性能的影响

张宁1,2,3(), 李先铭4, 李改花1,2,3, 张红霞1,2,3, 杨笑春1,2,3, 于静1,2,3   

  1. 1.唐山师范学院化学系,河北 唐山 063000
    2.河北省可降解聚合物重点实验室,河北 唐山 063000
    3.唐山市有机硅材料重点实验室,河北 唐山 063000
    4.唐山师范学院物理科学与技术学院,河北 唐山 063000
  • 收稿日期:2024-09-10 出版日期:2025-08-26 发布日期:2025-07-30
  • 作者简介:张宁(1979—),女,教授,从事高分子材料加工助剂研究,zhni0827@163.com
  • 基金资助:
    唐山师范学院校级科研项目(20255128033)

Influence of surface⁃modified hydrotalcite with various coupling agents on the properties of PVC

ZHANG Ning1,2,3(), LI Xianming4, LI Gaihua1,2,3, ZHANG Hongxia1,2,3, YANG Xiaochun1,2,3, YU Jing1,2,3   

  1. 1.Department of Chemistry,Tangshan Normal University,Tangshan 063000,China
    2.Hebei Key Laboratory of Degradable Polymers,Tangshan 063000,China
    3.Tangshan Silicone Key Laboratory,Tangshan 063000,China
    4.School of Physical Science and Technology,Tangshan Normal University,Tangshan 063000,China
  • Received:2024-09-10 Online:2025-08-26 Published:2025-07-30

摘要:

采用硅烷偶联剂、铝酸酯偶联剂、钛酸酯偶联剂、铝钛复合偶联剂分别对镁铝镧碳酸根插层水滑石表面进行湿法改性。探讨了改性温度和改性剂用量对活化度的影响,通过红外光谱仪(FTIR)、X射线衍射仪(XRD)和扫描电子显微镜(SEM)进行表征。采用刚果红试纸法、烘箱变色法、热重分析法、力学谱仪等测定改性水滑石对聚氯乙烯(PVC)的热稳定性能和力学性能。结果表明,4种偶联剂仅对水滑石表面进行了有机改性,未改变其晶体层状结构,减少了晶粒间的团聚,能够更好地延缓PVC热降解,提高材料的弹性和韧性。其中铝钛复合偶联剂的用量最少但改性效果最佳,使PVC初始分解温度提高了近44 ℃,拉伸强度和冲击强度较未改性前分别提高了34 %、17 %。

关键词: 聚氯乙烯, 偶联剂, 水滑石, 表面改性

Abstract:

The surface of magnesium⁃aluminum⁃lanthanum carbonate hydrotalcite was modified via a wet method using four coupling agents: aluminum ester, titanium ester, aluminum⁃titanium composite, and silane. The effects of modification temperature and modifier dosage on activation degree were investigated. Fourier⁃transform infrared spectroscopy, X⁃ray diffraction, and scanning electron microscopy confirmed that the coupling agents only modified the hydrotalcite surface organically without altering its layered crystal structure. The modified hydrotalcite significantly reduced particle agglomeration, enhancing its dispersion in poly(vinyl chloride) (PVC). Thermal stability and mechanical properties of the PVC composites were evaluated using Congo red testing, thermal aging, thermogravimetric analysis, and mechanical testing. Results indicated that the modified hydrotalcite delayed PVC thermal degradation and improved elasticity and toughness. The aluminum⁃titanium composite coupling agent exhibited the most efficient modification, requiring the least dosage while achieving optimal performance. Compared to unmodified hydrotalcite, the initial decomposition temperature of PVC increased by 44 °C, while tensile strength and impact strength improved by 34% and 17%, respectively.

Key words: poly(vinyl chloride), coupling agent, hydrotalcite, surface modification

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