Preparation and Performance of Polyvinyl Chloride-Waterborne Polyurethane Latex
Developing low volatile organic compound(VOCs)content water-based coatings is an effective approach to reducing pollution and aiding in the achievement of dual carbon goals.In this paper,a polymerizable waterborne polyurethane(WPU)was synthesized,which was used as a comonomer and a polymerizable emulsifier.With polyvinyl chloride(PVC)latex as the seed and aziridine(H-100)as the crosslinking agent,PVC-WPU latex was prepared by semi-continuous seed emulsion polymerization.The latex was applied to metal anti-corrosion coatings,and the anti-corrosion performance of the coatings was investigated through methods such as contact angle,water absorption,adhesion,and electrochemical testing analysis.The results showed that the low-frequency impedance value(|Z|f=0.01 Hz)of C-PVC-WPU(7%DMPA)coating is approximately 107 Ω·cm2 and the corrosion inhibition efficiency is 99.98%after soaking in 3.5%NaCl solution for 5 days.
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