Liu Chenyang, Sun Zhicheng, Jiao Shouzheng, Wang Ting, Liu Yibin, Meng Xianyu, Zhang Binbin, Han Lu, Liu Ruping, Liu Yuanyuan, Zhou Yang
Beijing Engineering Research Center of Printed Electronics, Beijing Institute of Graphic Communication, Beijing 102600, China.
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150090, China.
Polymers (Basel). 2023 Dec 29;16(1):105. doi: 10.3390/polym16010105.
Waterborne polymer-cement coatings have been widely applied in building materials due to their organic solvent-free nature, low cost, and eco-friendliness. However, these coatings can easily crack during the drying process as a result of construction environment factors, compromising the barrier performance of the coating and limiting its large-scale application. In this study, a dual-shell self-healing microcapsule was developed, which can effectively heal damage on a macro scale in waterborne polymer-cement coatings. Specifically, this dual-shell self-healing microcapsule was designed with a silica gel shell and a tannic acid-cuprum (TA-Cu) double-shell structure embedded with an epoxy resin (EP) healing agent, which was successfully fabricated via a two-step in situ polymerization. This silica gel shell self-healing microcapsules can effectively load into waterborne polymer-cement coatings. As the coating dries and solidifies, the silica gel shell of the microcapsule also becomes loose and brittle due to dehydration. This improves the mechanical initiation efficiency of the microcapsules in the coating. This study provides a novel approach for the application of self-healing microcapsules in waterborne coating systems, which can significantly reduce cracking during the drying process of waterborne polymer-cement coatings and improve the service life of the coating under complex conditions.
水性聚合物水泥涂料因其无有机溶剂、成本低和环保等特性，已在建筑材料中得到广泛应用。然而，由于施工环境因素，这些涂料在干燥过程中容易开裂，从而损害涂层的阻隔性能并限制其大规模应用。在本研究中，开发了一种双壳自修复微胶囊，它能有效修复水性聚合物水泥涂料中的宏观损伤。具体而言，这种双壳自修复微胶囊设计为具有硅胶壳以及包埋有环氧树脂（EP）修复剂的单宁酸 - 铜（TA - Cu）双壳结构，通过两步原位聚合法成功制备。这种硅胶壳自修复微胶囊能够有效地负载到水性聚合物水泥涂料中。随着涂料干燥固化，微胶囊的硅胶壳也会因脱水而变得疏松易碎。这提高了微胶囊在涂料中的机械引发效率。本研究为自修复微胶囊在水性涂料体系中的应用提供了一种新方法，可显著减少水性聚合物水泥涂料干燥过程中的开裂现象，并提高涂料在复杂条件下的使用寿命。
