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<p>In this study, the toughened epoxy coatings with sea–island structure were prepared through modification with CTBN, and the mechanical properties and low-temperature anticorrosion performance were investigated. The molecular dynamics (MD) simulations and analysis of the structure reveal that CTBN exists in the form of separated particles in the epoxy matrix (sea–island structure), and a chemical bond between the two phases is formed through an esterification reaction between the terminal carboxyl groups of CTBN and the epoxy groups. Mechanical tests demonstrate that the incorporation of CTBN significantly enhances the toughness of the coating under both room-temperature and low-temperature conditions, reaching its maximum value when the CTBN concentration is 15&#xa0;wt.%, and the maximum elongation and impact absorption energy at − 20&#xa0;°C are increased by approximately 137 and 82.6% compared to neat EP, respectively. At this point, the maximum particle size of the CTBN dispersed phase in the coating is ≤ 1.5&#xa0;μm. Additionally, the results of EIS, neutral salt spray test, and alternating test demonstrate that the coatings modified by CTBN possess more excellent anticorrosion performance, especially in the condition of low temperature.</p>

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Study on Preparation and Low-temperature Anticorrosion Performance of Toughened Epoxy Coatings with Sea–Island Structure

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Lingyun Tang,
  • Xiaohua Chen,
  • Cheng Man,
  • Wen Li,
  • Zhongyu Cui

摘要

In this study, the toughened epoxy coatings with sea–island structure were prepared through modification with CTBN, and the mechanical properties and low-temperature anticorrosion performance were investigated. The molecular dynamics (MD) simulations and analysis of the structure reveal that CTBN exists in the form of separated particles in the epoxy matrix (sea–island structure), and a chemical bond between the two phases is formed through an esterification reaction between the terminal carboxyl groups of CTBN and the epoxy groups. Mechanical tests demonstrate that the incorporation of CTBN significantly enhances the toughness of the coating under both room-temperature and low-temperature conditions, reaching its maximum value when the CTBN concentration is 15 wt.%, and the maximum elongation and impact absorption energy at − 20 °C are increased by approximately 137 and 82.6% compared to neat EP, respectively. At this point, the maximum particle size of the CTBN dispersed phase in the coating is ≤ 1.5 μm. Additionally, the results of EIS, neutral salt spray test, and alternating test demonstrate that the coatings modified by CTBN possess more excellent anticorrosion performance, especially in the condition of low temperature.