水性聚氨酯膜吸收CO_(2)矿化形成复合膜及其防腐蚀性能

Mineralization of Waterborne Polyurethane Film to Form Composite Film via Absorption of CO_(2)and Its Anticorrosion Properties

以异佛尔酮二异氰酸酯(IPDI)、聚醚二元醇(PPG)和N,N-二甲基-N',N'-二(2-羟丙基)-1,3-丙二胺等为主要原料制备了聚氨酯预聚体,并利用乙酸、3-羧基-3-羟基戊二酸和2,2-二羟甲基丙酸(DMPA)为成盐剂与聚氨酯预聚体反应,产物经乳化得到3种阳离子水性聚氨酯胶乳(WPU1,WPU2和WPU3),并将其制膜后浸泡在模拟海水中。研究了3种水性聚氨酯膜吸收CO_(2)并矿化形成聚氨酯-碳酸钙(PU-CaCO_(3))复合膜的过程及防腐蚀性能。红外光谱分析结果表明,成功合成了3种阳离子水性聚氨酯。粒径分析表明,WPU1,WPU2和WPU3胶乳粒径大小分别为19.38 nm,93.08 nm和84.33 nm。X射线衍射、扫描电镜和电化学测试结果表明,WPU2和WPU3膜经模拟海水浸泡后表面出现CaCO_(3)矿化层,WPU3膜表面形成的矿化层较致密,且具有优良的防腐蚀性能,其腐蚀速率和腐蚀电流密度分别为1.70×10^(-3)mm/a和1.44×10^(-7)A/cm^(2)。

Polyurethane prepolymers were prepared with isophorone diisocyanate(IPDI),poly(propylene glycol)(PPG)and N,N-dimethyl-N',N'-di(2-hydroxypropyl)-1,3-propanediamine.Acetic acid,citric acid and 2,2-dimethylolpropionic acid(DMPA)were used as salt-forming agent to react with the polyurethane prepolymer to prepare three kinds of ionized polyurethane,and then they were emulsified in water to obtain three kinds of waterborne polyurethane latexes which were abbreviated as WPU1,WPU2 and WPU3,respectively.Three kinds of waterborne polyurethane films were prepared from the latexes and immersed in simulated seawater to absorb CO_(2)and mineralize to form polyurethane-calcium carbonate(PU-CaCO_(3))composite films and their anticorrosion properties were studied.The process of three kinds of waterborne polyurethane films to absorb CO_(2)and mineralize to form polyurethane-calcium carbonate(PU-CaCO_(3))composite membranes and their anti-corrosion properties were studied.FT-IR results show that three kinds of cationic waterborne polyurethane were successfully synthesized.The particle size test shows that the particle sizes of WPU1,WPU2 and WPU3 latexes are 19.38 nm,93.08 nm and 84.33 nm,respectively.XRD,SEM and electrochemical test results show that after the simulate seawater immersion,the CaCO_(3)mineralization layer appears on both WPU2 and WPU3 film surface.The mineralization layer formed on the surface of WPU3 film is relatively dense and has excellent anticorrosion properties,and its corrosion rate and corrosion current density are 1.70×10^(-3)mm/a,1.44×10^(-7)A/cm^(2).