摘要
成膜树脂的极性与水性防腐蚀涂料的性能密切相关,明确这一相关性,有利于深入了解水性涂层的耐蚀性。通过控制环氧丙烯酸水性树脂分子的极性基团含量与非极性疏水链段链长,分析了4种环氧丙烯酸水性清漆的交联度、吸水率、玻璃化温度、电化学阻抗谱特征及特征频率fb值的测试结果,考察了树脂分子极性和分子量对水性涂层耐水耐蚀性的影响。结果表明:增加水性树脂极性基团含量可以改善涂层交联性能而增强涂层短期耐水耐蚀性能;然而,较多极性基团会形成过多的极性输水通道,导致水性涂层耐水耐蚀性能的削弱;在水性树脂分子链上引入较长的非极性疏水链段,可实现对极性基团的有效屏蔽,使得水性涂层在获取高极性基团含量带来的高交联性能的同时避免涂层亲水性的增大,进一步优化水性涂层的长期耐水耐蚀性能。
The polar group content and the hydrophobic chain of epoxy-acrylic waterbome resin （EA resin） were controlled, and the influences of resin polarity and molecular weight on the wasterresistance and corrosion resistance of waterborne coating were investigated via evaluating the cross - linking degree, water absorption, glass transition temperature, electrochemical impedance spectroscopy （EIS） and breakpoint frequency （fb） of the EA coatings with four kinds of different resin polarity. Results revealed that higher polar group contents increased the crosslinking property, thereby improving the short- term antieorrosion performance of the waterborne coatings. However, more polar groups would converse into polar channels for water/electrolyte penetration during the formation of waterborne films, hence accelerating the water uptake and deteriorating the corrosion resistance. Hydrophobic segments could provide shielding effect to the polar channels and then lower the water sensitivity of the coating, improving the long-term antieorrosive property by optimization.
作者
刘敏
李闽
钱洲亥
林安
LIU Min;LI Min;QIAN Zhou-hai;LIN An(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;School of Resource and Environmental Science,Wuhan University,Wuhan 430072,China;Department of Meehatronics Engineering,Wuhan Business University,Wuhan 430056,China)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第8期73-79,共7页
Materials Protection
基金
国网浙江省电力有限公司科技项目(5211DS15002H)
国网浙江省电力公司电力科学研究院科技项目(5211DS16000S)
国家自然科学基金项目(50771111)资助
