Sand casting water-based coating

Abstract

The invention discloses a sand casting water-based coating. The coating consists of the following components in part by weight: 20 to 30 parts of zircon powder, 15 to 20 parts of electro-fused mullite powder, 15 to 20 parts of quartz powder, 2 to 3 parts of lithium-based bentonite, 5 to 10 parts of flake graphite, 2 to 3 parts of silica sol, 0.5 to 0.8 part of sodium carboxymethylcellulose, 0.3 to 0.5 part of sodium alkyl benzene sulfonate, 0.4 to 0.6 part of sodium sulfate, 0.2 to 0.3 part of sodium carbonate, 0.2 to 0.3 part of n-octanol, 0.2 to 0.3 part of fatty alcohol-polyoxyethylene ether and 30 to 40 parts of water, wherein the granularity of the zircon powder, the electro-fused mullite powder and the quartz powder can be 200 to 320 meshes.

Description

technical field [0001] The invention relates to the field of casting, in particular to the field of sand casting. Background technique [0002] When using sand molds to produce castings, it is a very important process to apply casting coatings on the working surface of the mold (core). Casting coating is a kind of refractory coating, and its main components are: refractory powder, carrier liquid, suspending agent, binder and other additives. The main function of the coating is: to block the direct contact between the molten metal and the surface of the sand mold (core), and play an isolation role, eliminating the necessary elements for the physical or chemical reaction between the molten metal and the surface of the sand mold (core), thereby effectively preventing and Reduce defects such as sand sticking, sand inclusions, and sand holes on the surface of castings; improve the surface strength of the mold (core); control the cooling rate of castings to prevent shrinkage cavi...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent literature discloses a kind of name is " alcohol-based or water-based sand powder anti-penetration sticky sand foundry coating " (publication number: CN1666828, publication date: September 14th, 2005), its raw material composition is complex and diverse, batching, preparation The procedures are complicated, the manufacturing cost is obviously high, and its technical performance indicators still cannot meet the requirements, mainly reflected in: 1. The performance of the brushing process is not good; 2. The storage and stability of the paint are poor, and the viscosity is easy to appear during storage. decline