Due to the outstanding properties comprised of thermal, anti-corrosion and excellent processing properties, the polyurethane coating has received attention from many researchers. However, absence of self-healing capacity limited their applications. In the present work, a self-healing polyurethane (PU) was developed for protective coating via Diels–Alder reaction. Moreover, incorporation of Halloysite nanotubes (HNTs) by in situ polymerization method in the PU enhances the mechanical properties. The macro- and micro-mechanical properties of materials were investigated by tensile and nanoindentation measurement, these results show the composites displayed higher tensile strength (34.2 MPa) and hardness (5.13 MPa) in comparison with pure PU (22.9 MPa and 4.24 MPa). The tensile and POM results indicated that the PU and composites have excellent self-healing property. The simulative salt spray tests indicated the coating possessed an excellent corrosion protection property. Therefore, this work is promising for the self-healing ability protective polymer coating.

聚氨酯涂料由于具有耐热性、防腐性和优良的加工性能等优异性能，受到了众多研究人员的关注。然而，缺乏自愈能力限制了它​​们的应用。在目前的工作中，通过 Diels-Alder 反应开发了一种用于保护涂层的自修复聚氨酯 (PU)。此外，通过原位聚合方法在 PU 中加入埃洛石纳米管 (HNT) 可提高机械性能。通过拉伸和纳米压痕测量研究了材料的宏观和微观力学性能，这些结果表明与纯 PU（22.9 MPa 和 4.24 MPa）相比，复合材料显示出更高的拉伸强度（34.2 MPa）和硬度（5.13 MPa）。拉伸和 POM 结果表明 PU 和复合材料具有优异的自愈性能。模拟盐雾试验表明涂层具有优良的防腐性能。因此，这项工作对于具有自修复能力的保护性聚合物涂层很有前景。