| 赵敏,张倩,杨睿,蔺跃龙,边磊,周文清,赵猛.低场核磁共振研究胶黏剂的固化和老化过程[J].装备环境工程,2023,20(10):118-123. ZHAO Min,ZHANG Qian,YANG Rui,LIN Yue-long,BIAN Lei,ZHOU Wen-qing,ZHAO Meng.Curing and Aging of Adhesives by Low-field Nuclear Magnetic Resonance[J].Equipment Environmental Engineering,2023,20(10):118-123. |
| 低场核磁共振研究胶黏剂的固化和老化过程 |
| Curing and Aging of Adhesives by Low-field Nuclear Magnetic Resonance |
| 投稿时间：2023-09-24 修订日期：2023-10-09 |
| DOI：10.7643/issn.1672-9242.2023.10.014 |
| 中文关键词: 低场核磁共振 胶黏剂 固化 老化 交联结构 弛豫时间 固化机理中图分类号:O631.6 文献标识码:A 文章编号:1672-9242(2023)10-0118-06 |
| 英文关键词:low-field nuclear magnetic resonance (LF-NMR) adhesive curing aging cross-linked structure relaxation time curing mechanism |
| 基金项目: |
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| Author | Institution |
| ZHAO Min | Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
| ZHANG Qian | Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
| YANG Rui | Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
| LIN Yue-long | Inner Mongolia Institute of Dynamical Machinery, Hohhot 010010, China |
| BIAN Lei | Inner Mongolia Institute of Dynamical Machinery, Hohhot 010010, China |
| ZHOU Wen-qing | Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
| ZHAO Meng | Inner Mongolia Institute of Dynamical Machinery, Hohhot 010010, China |
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| 中文摘要: |
| 目的 研究胶黏剂的固化程度及在自然贮存和温度循环中的变化。方法 利用低场核磁共振技术，通过测定胶黏剂中氢原子在固化和老化过程中横向弛豫时间T2的变化，反映固化过程中交联结构的发展，以及交联结构在6个月自然贮存和100次高低温循环过程中的变化，阐明胶黏剂的老化机理。结果 光固化胶黏剂的光交联反应在20 min后就进行完全，热固化胶黏剂在60 ℃固化4 h后即达到了较高程度的交联，120 ℃固化对交联程度的影响不大，更多的是对交联结构的完善。经过‒45~75 ℃下100次高低温循环后，胶黏剂的交联结构变化不明显。自然贮存6个月后，胶黏剂不仅发生继续交联，而且结构发生了一定的松弛，这些将对其长期使用稳定性带来影响。结论 低场核磁共振对氢原子的运动能力敏感，而且制样简单，测试速度快，是研究交联结构变化的强有力的工具，对胶黏剂的研制、固化工艺优化、固化机理研究具有重要的应用价值。 |
| 英文摘要: |
| The work aims to study the curing degree of adhesive and its changes in natural storage and temperature cycle. With the help of the low-field nuclear magnetic resonance (LF-NMR) technology, the change of transverse relaxation time T2 of hydrogen atom in the adhesive during curing and aging was measured to reflect the development of cross-linked structure during curing and the change of the cross-linked structure during 6 months of natural storage and 100 high and low temperature cycles, and clarify the aging mechanism of the adhesive. The results showed that the photo-cross-linking reaction of the light-cured adhesive was completed in 20 min minutes. The thermosetting adhesive reached a high degree of cross-linking after curing at 60 ℃ for 4 h. Curing at 120 ℃ had little effect on the cross-linking degree, but improved the cross-linked structure further. After 100 high and low temperature cycles at ‒45~75 ℃, the cross-linked structure of the adhesive did not change obviously. However, after natural storage for 6 months, the adhesive not only continued to cross-link, but also had a certain relaxation in structure, which would affect its long-term use stability. Low-field nuclear magnetic resonance is sensitive to the mobility of hydrogen atoms, simple in preparation and fast in testing. It is a powerful tool to study the changes of the cross-linked structure, and has important application value in the development of adhesives, the optimization of curing process and the study of curing mechanism. |
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