Study on the chemical bonding at the interface between epoxy primer and polyurethane topcoat

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2024-07-27 DOI:10.1016/j.porgcoat.2024.108677

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Abstract

This study investigates the interlayer bonding mechanism between epoxy primers and polyurethane topcoats commonly used in marine coatings. Previous studies have focused on the physical bonding between the coatings, but this study focused on the theory of chemical bonding. Using E-44 and HP2000 as primers and MDI toluene solution to simulate a polyurethane topcoat, the changes in the molecular structure at the interface between the epoxy primer and the polyurethane topcoat after curing were revealed by sum-frequency vibrational spectroscopy (SFG) technique. The experiments showed that the hydroxyl (-OH) signals on the surface of the epoxy primer disappeared after contacting with the MDI solution, and the isocyanate (-NCO) and carbonyl (C=O) signals on the urethane topcoat were revealed, suggesting that a chemical reaction occurred between them. The results of SFG analysis were further supported by X-ray photoelectron spectroscopy, Raman spectroscopy, infrared spectroscopy and scanning electron microscopy. It was found that chemical bonding had a positive effect on the macroscopic properties of the coatings, indicating that the interlayer bonding between the primer and the topcoat could be significantly enhanced by chemical bonding, which provides new theoretical support for the interlayer bonding of the coating support system for marine environment.

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环氧底漆与聚氨酯面漆界面化学键合研究

本研究探讨了船舶涂料中常用的环氧底漆和聚氨酯面漆之间的层间结合机制。以往的研究侧重于涂料之间的物理结合，而本研究则侧重于化学结合理论。使用 E-44 和 HP2000 作为底漆，用 MDI 甲苯溶液模拟聚氨酯面漆，通过总频振动光谱（SFG）技术揭示了固化后环氧底漆和聚氨酯面漆界面分子结构的变化。实验表明，环氧底漆表面的羟基（-OH）信号在与 MDI 溶液接触后消失了，而聚氨酯面漆上的异氰酸酯（-NCO）和羰基（C=O）信号则显露出来，这表明它们之间发生了化学反应。X 射线光电子能谱、拉曼光谱、红外光谱和扫描电子显微镜进一步证实了 SFG 分析的结果。研究发现，化学键合对涂层的宏观性能有积极影响，表明底漆和面漆之间的层间键合可以通过化学键合显著增强，这为海洋环境涂层支撑体系的层间键合提供了新的理论支持。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.