聚氯乙烯-水性聚氨酯水乳胶的合成与性能研究

Preparation and Performance of Polyvinyl Chloride-Waterborne Polyurethane Latex

发展低挥发性有机物(VOCs)含量的水性涂料是降低污染、助力实现“双碳”目标的有效途径。本研究合成了可聚合水性聚氨酯(WPU),以其作为共聚单体与可聚合乳化剂,以聚氯乙烯(PVC)水乳胶为种子,同时引入氮丙啶(H-100)交联剂,通过半连续种子乳液聚合法制备了聚氯乙烯-水性聚氨酯(PVC-WPU)水乳胶。将该水乳胶用于金属防腐蚀涂层,通过接触角、吸水率、附着力、电化学测试分析等方法考察了涂层的防腐蚀性能。结果表明,在3.5%的NaCl溶液中浸泡5 d后,交联聚氯乙烯-水性聚氨酯(C-PVC-WPU)涂层的低频阻抗值(|Z|f=0.01Hz)约为107Ω·cm2,腐蚀抑制效率为99.98%。

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 107Ω·cm2 and the corrosion inhibition efficiency is 99.98%after soaking in 3.5%NaCl solution for 5 days.