PDF(Pubmed)
Abstract：
Steel structures located in subtropical marine climates face harsh conditions such as strong sunlight and heavy rain, and they are extremely corroded. In this study, a waterborne coating with excellent corrosion resistance, hydrophobic ability, high-temperature resistance and high density was successfully prepared by using modified nanoscale titania powders and grafted polymers. The effects of three modifiers on titania nanoparticles and waterborne coatings\' properties were studied independently. The experimental results showed that the activation index of the modification employing methacryloxy silane reached 97.5%, which achieved the best modification effect at 64.4 °C for 43.3 min. The waterborne coating with nanoscale titania modified by methacryloxy silane exhibited the best hydrophobic effect, with a drop contact angle of 115.4° and excellent heat resistance of up to 317.2 °C. The application of the waterborne modified coating in steel structures under subtropical maritime climates showed that the waterborne titania coatings demonstrated excellent resistance to corrosion, high temperatures and harsh sunlight, with a maximum service life of up to five years. Economic analysis indicated that, considering a conservative three-year effective lifespan, this coating could save more than 50% in cost compared with conventional industrial coatings. Finally, the strengthening mechanism of the polymer coatings with modified nanoscale titania was analyzed.
摘要：
位于亚热带海洋气候的钢结构面临着强烈的阳光和大雨等恶劣条件,它们被腐蚀得非常厉害。在这项研究中,具有优异耐腐蚀性的水性涂料，疏水能力，用改性纳米二氧化钛粉体和接枝聚合物成功制备了耐高温、高密度的二氧化钛粉体。独立研究了三种改性剂对二氧化钛纳米颗粒和水性涂料性能的影响。实验结果表明,采用甲基丙烯酰氧基硅烷改性的活化指数达到97.5%,在64.4℃43.3min时取得了最好的改性效果。经甲基丙烯酰氧基硅烷改性的纳米二氧化钛水性涂层表现出最好的疏水效果,具有115.4°的液滴接触角和高达317.2°C的优异耐热性。水性改性涂料在亚热带海洋气候下的钢结构中的应用表明，水性二氧化钛涂料表现出优异的耐腐蚀性。高温和刺眼的阳光，最长使用寿命达五年。经济分析表明,考虑到保守的三年有效寿命，与常规工业涂料相比，该涂料可节省50％以上的成本。最后,分析了改性纳米二氧化钛对聚合物涂层的增强机理。
