Study of surface hardness and self-healing ability of DA modified polyurethane coating

Next Materials Pub Date : 2025-07-17 DOI:10.1016/j.nxmate.2025.100955

Babloo Roy Gautam, Nazrul Islam Khan

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Abstract

In this work, a self-healable polyurethane coating has been developed with the help of the Diels-Alder cycloaddition reaction mechanism. This coating powder was prepared by adding DA-based healing agents in hydroxyl-functionalized polyester resin and uretdione crosslinker and applied on a well-prepared steel substrate using the electrostatic spray method. Two samples were prepared with 5 wt% and 10 wt% of healing agents with respect to the polyester resin. DSC test was performed to confirm the DA and retro-DA reaction. A depth-sensing nano-indentation test was carried out to check the hardness of the coating, and the surface roughness of the film was analysed by surface profilometer and FESEM analysis of the coated surface. The healing characteristics of these prepared samples were analysed by a scratch healing test and compared with coating without a healing agent. The hardness of the film was improved by ∼3 % and 12 % with the addition of 5 wt% and 10 wt% healing agent, respectively. Surface roughness of the coating was improved by the addition of a healing agent. Coating with 5 wt% and 10 wt% healing agent shows maximum healing efficiency of ∼85.6 % and ∼93.6 % at 120 °C within 30 min, respectively. DA-based polyurethane coating has the potential to improve the life cycle of the coating.

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DA改性聚氨酯涂料的表面硬度和自愈能力研究

本文利用Diels-Alder环加成反应机理，研制了一种自愈聚氨酯涂料。该涂层粉末是在羟基功能化聚酯树脂和脲二酮交联剂中加入da基愈合剂制备的，并采用静电喷涂方法涂在制备好的钢基体上。两种样品分别用5 wt%和10 wt%的聚酯树脂愈合剂制备。DSC测试证实了DA和反DA反应。采用深度感测纳米压痕试验检测涂层硬度，采用表面轮廓仪和FESEM分析涂层表面粗糙度。通过划痕修复试验分析了所制备样品的修复特性，并与未添加愈合剂的涂层进行了比较。加入5 wt%和10 wt%的愈合剂后，膜的硬度分别提高了~ 3 %和12 %。通过加入一种愈合剂，涂层的表面粗糙度得到了改善。使用5 wt%和10 wt%愈合剂的涂层在120°C下30 min内的最大愈合效率分别为~ 85.6% %和~ 93.6 %。丙烯酸基聚氨酯涂料具有提高涂料寿命周期的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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