光热转换纳米容器的制备及其对环氧涂层自修复性能的影响  

Preparation of Photothermal Conversion Nanocontainers and Their Effect on the Self-healing Performance of Epoxy Coatings

作　　者：张文佼 谢雨桐 田庆 弓斌 董玉华[1] ZHANG Wenjiao;XIE Yutong;TIAN Qing;GONG Bin;DONG Yuhua(College of New Energy and Materials,China University of Petroleum(Beiing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)新能源与材料学院,北京102249

出　　处：《涂料工业》2024年第10期9-16,共8页Paint & Coatings Industry

基　　金：国家重点研究发展计划项目(2022YFC2803702);国家重点研发计划(2022YFC2803700)。

摘　　要：以金属有机框架NH_(2)-UiO-66为基础,采用“一锅法”负载缓蚀剂BTA与光热材料TiN,合成后再包覆一层与环氧树脂有较好相容性的聚多巴胺,合成了一种具有光热转换性能的纳米容器PDA@(NH_(2)-UiO-66@BTA/TiN),以达到提高光热性能、阻止缓蚀剂不必要释放的作用。对所得的纳米容器进行形貌表征以及缓蚀剂缓释效果测试,而后将其添加在环氧涂层中进行自修复以及电化学腐蚀测试。结果表明:复合材料具有八面体结构,粒径均匀,聚多巴胺包覆在纳米容器外层后,PDA@NH_(2)-UiO-66@BTA/TiN外壳变厚,外层的聚多巴胺和内层的光热材料TiN能够有效提高纳米容器光热性能,在光照下能够促进缓蚀剂的释放,同时在无光照情况下能够一定程度上阻止内部缓蚀剂的释放。PDA@(NH_(2)-UiO-66@BTA/TiN)作为填料加入环氧树脂后可提高涂层的自修复性能和防腐性能,划痕处的自修复效率达到98.62%,且涂层在光照进行自修复后仍具有较好的防护能力,在3.5%Na Cl溶液中浸泡20 d后阻抗模值依然维持在10~7Ω·cm^(2)以上,且金属基本表面基本没有腐蚀产物。将制备的PDA@(NH_(2)-UiO-66@BTA/TiN)纳米容器添加至环氧涂层中,可显著提升涂层的自修复性和防腐性。A nanocontainer[PDA@(NH_(2)-UiO-66@BTA/TiN)]with photothermal conversion function was prepared by loading BTA(corrosion inhibitor)and TiN(photothermal agent)onto the metal-organic framework(NH_(2)-UiO-66)through a“one-pot”method followed by coating a layer of polydopamine(PDA)with good compatibility with epoxy resin.It could enhance the photothermal performance and prevent unnecessary release of corrosion inhibitor.The morphological characterization and sustained-release effect of corrosion inhibitor of the prepared nanocontainers were characterized,and the self-healing and electrochemical performance of the epoxy coating containing nanocontainers were then tested.The results indicated that the composite material exhibited an octahedral structure with uniform particle size.The nanocontainer shell thickened after the PDA was coated.The outer layer of PDA and the inner layer of TiN could effectively improve the photothermal performance,facilitate the release of corrosion inhibitor under light irradiation,while prevent the release of corrosion inhibitor to a certain extent in the absence of light.When the prepared nanocontainer were added as fillers in the epoxy coatings,self-healing and anticorrosive properties of the coating could be enhanced.The self-healing efficiency at scratches reached 98.62%,and the coating maintained excellent protective capabilities after self-healing under light irradiation,with impedance modulus values remaining above 107Ω·cm^(2) after 20 days of immersion in 3.5%NaCl solution.Furthermore,the metal surface remained largely free of corrosion products.In summary,the prepared PDA@(NH_(2)-UiO-66@BTA/TiN)nanocontainers could significantly improve the self-healing and anticorrosive properties of epoxy coatings.

关 键 词：NH2-UiO-66 环氧涂层 光热转换 自修复涂层 电化学腐蚀测试 

分 类 号：TQ637[化学工程—精细化工]