Synthesis and property of room-temperature self-healable cathodic electrophoretic deposition coatings based on cationic waterborne polyurethane

IF 2.3 4区材料科学 Q2 Chemistry

Journal of Coatings Technology and Research Pub Date : 2022-06-29 DOI:10.1007/s11998-022-00634-w

Yingyu Li, Jingwei He, Hongfeng Luo, Xiaoling He, Fang Liu

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引用次数: 0

Abstract

Cathodic electrophoretic deposition (CED) coatings are inevitably scratched following their application in processes such as automotive finishing. Self-healing coatings possess the ability to repair micro-scale damage, thereby extending their service life and reducing maintenance costs. Here, a novel strategy was developed to synthesize room-temperature intrinsic self-healing CED coatings by inserting 2-aminophenyl disulfide (APDS) into the polymer chain of cationic waterborne polyurethane (CWPU). Emulsion films incorporating the disulfide (SCWPU) could self-heal at room temperature via dynamic disulfide bond exchange and hydrogen bonding interactions, and their structures were confirmed by FTIR and Raman spectroscopy. The thermal properties of the SCWPU films were determined by differential scanning calorimetry and thermal gravimetric analysis. The effects of APDS incorporation and hard segment content (HSC) on the self-healing ability, mechanical and emulsion properties of the SCWPU films were systematically investigated. The results showed that the self-healing abilities of SCWPU film were 97.2% at RT over 24 h and 96.5% at 37°C (body temperature) after 4 h. CED coatings (8 μm, 3H pencil hardness) prepared from SCWPU emulsion also displayed self-healing properties at room temperature.

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室温自愈型阳离子水性聚氨酯阴极电泳沉积涂料的合成及性能研究

阴极电泳沉积(CED)涂层在汽车涂饰等过程中不可避免地会出现划伤。自修复涂层具有修复微尺度损伤的能力，从而延长其使用寿命并降低维护成本。本文研究了在阳离子水性聚氨酯(CWPU)聚合物链中插入2-氨基苯基二硫醚(APDS)来合成室温本征自愈CED涂层的新策略。含二硫化物(SCWPU)的乳液膜可以通过动态二硫化物键交换和氢键相互作用在室温下自愈，并通过FTIR和拉曼光谱证实了其结构。采用差示扫描量热法和热重分析法测定了膜的热性能。系统研究了APDS掺入量和硬段含量(HSC)对SCWPU膜自愈能力、力学性能和乳液性能的影响。结果表明:在室温下，SCWPU膜在24 h内的自愈率为97.2%，在37℃(体温)下的自愈率为96.5%。SCWPU乳液制备的CED涂层(8 μm, 3H铅笔硬度)在室温下也具有自愈性能。

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来源期刊

Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS

CiteScore

4.40

自引率

8.70%

发文量

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.