The Effect of Aggregates, Binders, and Additives on the Properties of Water-Based Coatings for Foundry and the Coating Mechanism

This study investigated the use of water as the carrier liquid for refractory foundry coating and conducted a single-factor experiment to investigate the impact of refractory aggregate, binder, quick-drying agent, and water-reducing agent on the performance of the coating. The optimal ratio of refractory aggregate, binder, quick-drying agent, and water-reducing agent has been determined. The ratio of refractory aggregate, binder, quick-drying agent, and water-reducing agent was 80:8:0.5:0.5. The water-based coating prepared with this ratio has a drying time of 55 min at room temperature, a gas volume rate of 7.6 mL/g, and a wear loss of 0.0158 g. The film formation mechanism of the water-based coating was studied using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the water-based coating prepared in this study has several advantages, including a dense and smooth coating film, fast drying speed, high coating strength, and low gas volume. These properties make it suitable for practical production requirements and indicate broad prospects for application.