Water-based self-drying/quick-drying sand type casting coating and preparation method thereof

The invention provides a water-based self-drying/quick-drying sand type casting coating and a preparation method thereof, wherein the water-based self-drying/quick-drying sand type casting coating is high in drying speed, little in pollution/pollution-free, safe to use, low in manufacture cost and high in sintering and stripping rate. The preparation method takes natural fireproof materials which are not calcined or electrically molten, such as zircon powder, chromite powder or zirconic composite silicate mineral powder, as basic materials, adopts a normal-temperature cured-type modified macromoleclar polymer as a main normal-temperature self-drying/low-temperature quick-drying binder, takes a quick-drying type silicate binder as a main high-temperature binder, adopts an efficient composite suspension dispersant high in fire-resistant degree and low in hot shrinkage rate and is added with proper amounts of efficient water reducing agents and defoaming agents to prepare a steel-iron casting water-based self-drying/quick-drying coating which is high in content of solid (nonvolatile matter) and low in permeability. The water-based self-drying/quick-drying sand type casting coating is excellent in thixotropy, brushing property and quick-drying function, thereby achieving the aim of saving energy, improving the environment and improving the quality of castings. The water-based self-drying/quick-drying sand type casting coating is applicable to the field of casting coatings.