Water-based coating compositions and systems with improved sag resistance and related methods

The present invention provides a water-based coating and/or coating system that can be used to form sag resistant wet layers or coatings on a wide range of substrates. The coating system is particularly effective for protecting metal-containing substrates, such as intermodal cargo containers, against corrosion. As an overview, the present invention provides water-based compositions suitable to form primer coats on substrates. Desirably, the primer incorporates a high level of one or more CAS agents for excellent sag resistance while drying in a broad range of relative humidity environments. Alternatively, modifications can be made to control temperature and humidity during spray application and drying as a way to increase sag resistance of the coating. 本发明涉及具有改善抗下垂性的水基涂料组合物和体系以及相关方法，提供了种水基涂料组合物和/或涂料体系，其可用于在各种各样的基材上形成具有抗下垂性的湿层或涂层。该涂料体系对于保护含金属的基材(诸如联运货物集装箱)免受腐蚀特别有效。总的来说，本发明提供了种水基组合物，其适于在基材上形成底漆涂层。如期望地，底漆中掺入了高水平的种或多种CAS剂，从而在相对宽的相对湿度环境中干燥时具有优异的抗下垂性。或者，作为增强涂层的抗下垂性的种方式，可以在喷射涂覆和干燥期间进行修正以控制温度和湿度。