可用于生锈基材的自修复防腐涂料  

Self-repairing Anticorrosive Coatings for Rusty Substrates

作　　者：杨嘉辉 韩瑞 何海峰[1] 刘欣[1] 赵丽芬[1] 刘成宝 曾荣昌[1] YANG Jiahui;HAN Rui;HE Haifeng;LIU Xin;ZHAO Lifen;LIU Chengbao;ZENG Rongchang(School of Materials Science and Engineering,Shandong University of Science and Technology,Shandong Qingdao 266590,China;College of Polymer Science and Engineering,Qingdao University of Science and Technology,Shandong Qingdao 266061,China)

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590 [2]青岛科技大学高分子科学与工程学院,山东青岛266061

出　　处：《表面技术》2024年第12期114-125,共12页Surface Technology

摘　　要：目的制备具有自修复功能、可用于海洋环境中腐蚀金属部件的涂料。方法采用原位聚合法制备了以桐油为囊芯、脲醛树脂为囊壁的微胶囊,并将其添加于带锈防锈涂料中,然后将涂料涂覆在生锈的马口铁上。利用扫描电镜、能量色散谱仪、傅里叶变换红外光谱、扫描开尔文探针、热重分析和电化学阻抗谱等测试手段,对微胶囊和涂层的形貌、自修复性能和防腐性能进行表征。结果桐油被脲醛树脂包裹,制备出的微胶囊形貌良好,微胶囊的平均粒径为(47.37±9.41)μm,微胶囊对桐油的包覆效果良好,囊芯(桐油)的质量分数高达81.57%。含有20%(质量分数)微胶囊的涂层具有良好的自修复性能和耐腐蚀性,被划伤的涂层能够在24 h内完全自修复,通过对涂层的扫描电子观测和扫描开尔文探针可确认划痕区域是涂层自修复实现的,并且涂层能够长时间抵抗腐蚀。结论微胶囊可显著延长涂层的使用寿命,这种自修复技术有望在防腐涂料系统中得到应用,而且该涂料可直接应用于生锈的金属表面,降低了在复杂应用环境中涂覆金属部件的成本。Metals are prone to corrosion in marine environments.Therefore,it is very important to study the methods to prevent or slow down metal corrosion to increase the service life of metals.Protecting metals by organic coating is the most economical and widely used method.With tung oil as the core and urea-formaldehyde resin as the wall material,the in-situ polymerization method was used to prepare microcapsules suitable for surface coating of rusty metal.The preparation process of microcapsules was studied,and a coating for repairing corroded metal parts in marine environment was prepared by adjusting the preparation formula.The epoxy resin,xylene and ethanol were evenly mixed in a beaker at 50℃.Grinding powders of aluminum tripolyphosphate,zinc phosphate and ferric oxide were added into a beaker and used as functional fillers.Then,the penetrant,rust transforming agent,dispersant,leveling agent and defoaming agent were used as additives and added into the beaker.The beaker was sealed and the resulting mixture was stirred at 50℃for 0.5 h.Next,the prepared microcapsules(0%,5%,10%,15%,20%,25%and 30%mass fraction)and T31 curing agent were uniformly added into the above mixture.The coating was coated on the rusty tinplate substrate and cured at 25℃for 24 h.The tinplate was soaked in 3.5wt.%NaCl solution for 5 days.The rusty tinplate substrate was polished with 400 mesh sandpaper to make the rust layer smooth,and then coated.A coating with a thickness of about 300μm was prepared.The surface morphology and wall thickness of microcapsules were observed by scanning electron microscope.The chemical structures of microcapsules,urea-formaldehyde resin and tung oil were determined by Fourier transform infrared spectroscopy,and the materials in the scratch repair area were compared with those in the cured tung oil by infrared spectroscopy.Thermogravimetric analysis(TGA)was used to characterize the UF-tung oil microcapsules,tung oil and separated capsule wall samples.The mass fraction of the microcapsule core was calculated.T

关 键 词：自修复 原位聚合 微胶囊 生锈金属 防腐 涂料 

分 类 号：TG174[金属学及工艺—金属表面处理]