Resin sand type casting coating and preparation method thereof

Abstract

The invention relates to a resin sand type casting coating and a preparation method thereof, wherein the coating consists of the following components: graphite powder, zircon sand, porzite powder, spodumene powder, sodium bentonite, alkali phenolic resin, silica sol, polyvinyl acetate, carboxymethylcellulose sodium, sodium alkylbenzenesulfonate, fatty alcohol-polyoxyethylene ether and water. The resin sand type casting coating provided by the invention has the advantages of good suspension property, high strength, uniform coating layer and good leveling property. The surface of the dried coating is bright and clean and is free of cavities, bubbles, cracks and the like. After the resin sand type casting coating is used, the cast casting is very high in surface smoothness.

Description

technical field [0001] The invention belongs to the field of casting, in particular to the technical field of resin sand casting. Background technique [0002] Resin sand is used as a sand mold. During the casting process, the resin that solidifies between the sand grains is burned and decomposed, the connection between the sand grains is destroyed, and the high-temperature molten metal will penetrate into the sand mold, resulting in sand sticking. At the same time, a large amount of gas is formed after burning and decomposition, leaving the surface of the casting to form pore defects. [0003] The main function of the coating used in sand casting is to play a shielding role. At the casting temperature, a dense refractory coating can be formed on the surface of the core, which prevents the molten metal from penetrating into the sand mold and prevents the gas generated by thermal decomposition in the molding sand from entering the molten metal. , can obtain castings with smo...

AI Technical Summary

Problems solved by technology

[0004] However, the original coating has poor applicability and adhesion, which seriously affects the surface quality of castings.