基于东北地区环境下复合水性防腐涂料的制备及性能  

Preparation and properties of water-based composite anticorrosive coatings based on the environment in the Northeast China

作　　者：王俊淇 王森 郝成钢 冀爽 于瑞歆 乔天宇 刘鑫 张兰河[2] WANG Junqi;WANG Sen;HAO Chenggang;JI Shuang;YU Ruixin;QIAO Tianyu;LIU Xin;ZHANG Lanhe(Siping Power Supply Company of State Grid Jilin Electric Power Limited Company,Siping 136099,Jilin,China;School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China)

机构地区：[1]国网吉林省电力有限公司四平供电公司,吉林四平136099 [2]东北电力大学化学工程学院,吉林吉林132012

出　　处：《精细化工》2024年第9期2072-2081,共10页Fine Chemicals

基　　金：国网吉林省电力有限公司科技项目(2023-13);吉林省发改委产业技术研究与开发项目(2020C028-5)。

摘　　要：为提升水性丙烯酸树脂(AP)中掺杂氧化石墨烯(GO)的分散性和对金属腐蚀的防护能力,以六亚甲基二异氰酸酯、对苯二胺、聚乙烯吡咯烷酮与3-氨丙基三乙氧基硅烷对GO进行改性,得到了强化分散型氧化石墨烯(RDGO),最后利用湿式转移法将RDGO和AP复合,制备了水性防腐涂料(RDGO/AP)。采用FTIR、Raman、XRD、SEM、TGA对RDGO/AP涂层进行了表征,通过电化学和腐蚀实验考察其防腐蚀能力。结果表明,RDGO呈二维晶体结构,层间距从GO的0.0761 nm扩大至0.1045 nm,避免了GO的团聚现象;RDGO的失重起点温度为254℃,具有良好的热稳定性。与AP涂层相比,RDGO/AP涂层水接触角(98.00°)增大了3.99°,硬度(4H)提升了两级,附着力(1级)提升了两级;在质量分数3.5%的NaCl溶液中浸泡14 d后,与AP涂层相比,RDGO/AP涂层的腐蚀电压提高了0.479 V,腐蚀电流密度降低了1.172×10^(–5)A/cm^(2),保护效率高达99.9%。RDGO/AP良好的防腐蚀能力归因于RDGO表面的羰基基团易与AP中的羟基基团发生交联反应,提高了RDGO在丙烯酸树脂体系中的分散性,增强了界面的黏结力,提高了涂层的韧性和剪切强度,加大了RDGO与成膜基底的结合力,提升了涂层防腐效果。To improve the dispersibility and corrosion protection against metal corrosion of doped graphene oxide(GO)in water-based acrylic resin(AP),GO was modified with hexamethylene diisocyanate,p-phenylenediamine,polyethylene pyrrolidone and 3-aminopropyltriethoxysilane to prepare reinforced dispersion graphene oxide(RDGO),which then combined with AP through wet transfer method to synthesize water-based anti-corrosion coating(RDGO/AP).The RDGO/AP coating obtained was characterized by FTIR,Raman,XRD,SEM and TGA,and evaluated for its anti-corrosion ability by electrochemical and corrosion experiments.The results showed that RDGO exhibited a two-dimensional crystal structure,with the interlayer spacing increased from 0.0761 nm of GO to 0.1045 nm,thus preventing the aggregation phenomenon of GO.The RDGO exhibited a mass loss starting temperature of 254℃,indicating good thermal stability.Compared with AP coating,the RDGO/AP coating showed an increase in water contact angle(98.00°)by 3.99°,the hardness(4H)by 2H,and the adhesion(level 1)by 2 levels.After soaked in a 3.5%(mass fraction)NaCl solution for 14 d,compared with the AP coating,the RDGO/AP coating had an increase in corrosion voltage by 0.479 V and decrease in the corrosion current density by 1.172×10^(-5)A/cm^(2),with a protection efficiency up to 99.9%.The good corrosion resistance of RDGO/AP could be attributed to the fact that the carbonyl groups on the surface of RDGO were prone to grafting with the hydroxyl group in AP,improving the dispersibility of RDGO in the acrylic resin,strengthening the interfacial adhesion,increasing the toughness and shear strength of the coating,and elevating the adhesion between RDGO and film-forming substrate,thereby enhancing the anti-corrosion effect of the coating.

关 键 词：金属腐蚀 涂料 氧化石墨烯 丙烯酸树脂 对苯二胺 建筑用化学品 

分 类 号：TQ031.2[化学工程]