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<p>Incorporating microcapsules containing self-healing materials into anticorrosion coatings imparts self-healing capabilities to the coatings, enhancing their robustness, maintaining excellent anticorrosion performance, and reducing maintenance costs. However, traditional single-shell microcapsules exhibit poor stability in coatings and are prone to premature rupture under environmental influences, leading to unsatisfactory repairing effects. To address this issue, this work designed and prepared a double-shell microcapsule system using melamine formaldehyde (MF) resin as the outer shell material, polyurea (PUA) as the inner shell material, and isophorone diisocyanate (IPDI) as the core material. Additionally, a chain extender was incorporated to improve the toughness of the MF resin, achieving microcapsules with high stability and high core content. The results indicated that when the amount of methylated melamine–formaldehyde (MMF) resin prepolymer was 8.5&#xa0;g, the mass ratio of tetraethylenepentamine (TEPA) to polyetheramine (D230) was 1:1.5, and the mass ratio of styrene–maleic anhydride copolymer (SMA) to iso-tridecanol polyoxyethylene ether (TO-8) was 3:1, the microcapsules achieved a maximum core content of 61.76%. When the microcapsule content in the coating was between 5 and 10%, scratches in the damaged areas nearly disappeared, and no rust was observed, demonstrating excellent self-healing performance. The findings of this work presented promising applications for self-healing anticorrosion coatings.</p> Graphical abstract <p></p>

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Preparation of chain extender-modified high stability isophorone diisocyanate/polyurea-melamine resin double-shell microcapsules and their application in self-healing coatings

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Dongrui Ji,
  • Baolian Zhang,
  • Chenwei Lin,
  • Xiaolan Liao,
  • Hongbin Zhao,
  • Yan Wang,
  • Dahu Lin,
  • Xiaopeng Fan

摘要

Incorporating microcapsules containing self-healing materials into anticorrosion coatings imparts self-healing capabilities to the coatings, enhancing their robustness, maintaining excellent anticorrosion performance, and reducing maintenance costs. However, traditional single-shell microcapsules exhibit poor stability in coatings and are prone to premature rupture under environmental influences, leading to unsatisfactory repairing effects. To address this issue, this work designed and prepared a double-shell microcapsule system using melamine formaldehyde (MF) resin as the outer shell material, polyurea (PUA) as the inner shell material, and isophorone diisocyanate (IPDI) as the core material. Additionally, a chain extender was incorporated to improve the toughness of the MF resin, achieving microcapsules with high stability and high core content. The results indicated that when the amount of methylated melamine–formaldehyde (MMF) resin prepolymer was 8.5 g, the mass ratio of tetraethylenepentamine (TEPA) to polyetheramine (D230) was 1:1.5, and the mass ratio of styrene–maleic anhydride copolymer (SMA) to iso-tridecanol polyoxyethylene ether (TO-8) was 3:1, the microcapsules achieved a maximum core content of 61.76%. When the microcapsule content in the coating was between 5 and 10%, scratches in the damaged areas nearly disappeared, and no rust was observed, demonstrating excellent self-healing performance. The findings of this work presented promising applications for self-healing anticorrosion coatings.

Graphical abstract