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Jiaying Zhang,Hui Zheng,Haibo Geng,Ying Li,Yapeng Guan,Yuanbin Sun,Cunjian Zhu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
Environmental friendly poly (propylene carbonate)-based waterborne polyurethane (PPC-based WPU) isprepared with PPC and isophorone diisocyanate (IPDI) as the soft segment and the hard segment, respectively. In thisreaction system, 2,2-dimethylolbutyric acid (DMBA) is used as the hydrophilic donor and trimethylolpropane (TMP)as the crosslinking agent. The effect of co-doping of layered montmorillonite (MMT) and mesoporous material MCM-41 on corrosion resistance of PPC-based WPU resin was studied. The properties of the samples were characterizedwith N2 physical adsorption, XRD, FT-IR, TG-DTA, DSC and water absorption testing. Potentiodynamic polarizationcurves, electrochemical impedance spectroscopy (EIS) and salt spray test were employed to investigate the corrosionperformance of all the coatings. The results of XRD indicate that the MMT in the composite polyurethane resin ispeeled off and MCM-41 maintains the hexagonal framework structure after grinding. Compared with the WPU coatingswith MMT or MCM-41 single incorporation, those with MMT and MCM-41 co-incorporation show the best corrosionresistance, which is due to the different interface structure between filler and resin matrix.