曼尼希碱复合丁香酚基有机硅水性聚氨酯防腐涂层的制备及性能研究  

Preparation and Performances of Mannich Base Composite Eugenol-based Organosilicon Waterborne Polyurethane Anticorrosive Coating

作　　者：周晓含 袁洋 杨承伟 朱印 王玉斌 王煦[1] ZHOU Xiaohan;YUAN Yang;YANG Chengwei;ZHU Yin;WANG Yubin;WANG Xu(College of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Dongfang Electric Wind Power Co.,Ltd.,Deyang 618000,China;Institute of Engineering Technology,PetroChina Coalbed Methane Company Limited,Xi'an 710082,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]东方电气风电股份有限公司,四川德阳618000 [3]中石油煤层气有限责任公司工程技术研究院,陕西西安710082

出　　处：《塑料工业》2024年第4期68-75,共8页China Plastics Industry

摘　　要：为提升水性聚氨酯(WPU)的耐水及重防腐能力,本文以曼尼希反应合成曼尼希(Mannich)碱缓蚀剂;以4,4′-(1,1,3,3-四甲基二硅氧-1,3-二丙基)双-2-甲氧基苯酚(EUSi)为扩链剂在WPU分子链中引入Si-O-Si等疏水结构,制备有氢键作用的M/EUSiWPU复合涂层。采用核磁共振氢谱、红外光谱分析、乳液稳定性分析对EUSiWPU、曼尼希碱缓蚀剂及复合乳液进行表征、吸水率测试及电化学测试对复合膜和涂层进行性能分析。实验结果初步表明曼尼希碱及EUSiWPU的合成;加入3%曼尼希碱缓蚀剂的M/EUSiWPU-3粒径分布均匀,乳液稳定性强;复合涂层吸水率随缓蚀剂含量增加而降低,最低为19.60%、低频阻抗增强,比EUSiWPU涂层提高近4个数量级;加入曼尼希碱缓蚀剂使涂层自腐蚀电位正向移动,自腐蚀电流先增大后减小,而M/EUSiWPU-3腐蚀速率最低,为5.25×10^(-6) A/cm^(2);自腐蚀电流密度最小,为2.30×10^(-7)μA/cm~2,保护效率达97.56%。In order to enhance the water and heavy corrosion resistance of waterborne polyurethane(WPU),Mannich base corrosion inhibitor was synthesized by Mannich reaction in this paper.M/EUSiWPU composite coatings with hydrogen-bond interactions were prepared by introducing hydrophobic structures such as Si—O—Si into the WPU molecular chains using 4,4′-(1,1,3,3-tetramethyldisiloxo-1,3-dipropyl)bis-2-methoxyphenol(EUSi)as the chain extender.Nuclear magnetic resonance hydrogen spectroscopy,infrared spectroscopy analysis,emulsion stability analysis were used to characterize EUSiWPU,Mannich base and composite emulsion.Water absorption test and electrochemical test were used to analyze the performances of composite film and coating.The preliminary results of the experiments show that the Mannich base and EUSiWPU have been synthesized.The M/EUSiWPU-3 containing Mannich base with a mass fraction of 3%has a uniform particle size distribution and its emulsion stability is strong.The water absorption of the composite coating decreases with the increasing of corrosion inhibitor content.The minimum water absorption is 19.60%,and the low-frequency impedance of the composite coating is also enhanced,which is nearly four orders of magnitude higher than that of EUSiWPU coating.The addition of Mannich base shifts the coating self-corrosion potential positively,and the self-corrosion current firstly increases and then decreases.The M/EUSiWPU-3 has the lowest corrosion rate of 5.25×10^(-6) A/cm^(2),the smallest self-corrosion current density of 2.30×10^(-7)μA/cm^(2) and the protection efficiency of 97.56%.

关 键 词：重防腐 曼尼希碱 缓蚀剂 氢键 复合涂层 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]