Water-based paint for lightweight evaporative pattern casting and enhanced by nanometer silicon carbide and preparing method of water-based paint

Abstract

The invention relates to the technical field of evaporative pattern casting, and in particular to a water-based paint for lightweight evaporative pattern casting and enhanced by nanometer silicon carbide and a preparing method of the water-based paint. Zircon sand and calcium hexaluminate serve as refractory aggregate of the paint, wherein the zircon sand and calcium hexaluminate are different from each other in particle size, so that the breathability of a coating is improved. Mixed slurry of super-light clay and sodium carboxymethylcellulose serves as a suspension agent, so that the paint is made to have good suspension performance and thixotropy. The added nanometer silicon carbide enhances the heat resistance and mechanical properties of the coating. Sand viscidity prevention of the coating can be improved through scattered microcrystalline wax, and the microcrystalline wax is melted in the casting process, so that the breathability of the coating is further improved. The paint coating prepared through the method is light and thin, tenacious and firm, good in attachment to metal liquid, high in heat stability, free of polluting metal liquid and easy to strip after casting is finished, and the quality of castings is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lost foam casting, in particular to a water-based paint for lightweight lost foam casting reinforced by nano-silicon carbide and a preparation method thereof. Background technique [0002] The coating for lost foam refers to a layer of special coating coated on the outer surface of the pattern during the lost foam casting process. It plays a key role in the casting process. Since the pattern is made of foam plastic, the gas permeability of the coating , coating strength, rheology and other properties will have a crucial impact on the casting product. The lost foam coating with excellent performance should meet: (1) It can help improve the strength and rigidity of the foam plastic pattern and prevent the pattern from being damaged and deformed. (2) It has the function of isolation, which separates the molten metal from the model, prevents the molten metal from penetrating into the dry sand, and prevents th...

AI Technical Summary

Problems solved by technology

[0003] The composition of lost foam coatings mainly includes refractory aggregates, adhesives, solvents, suspending agents and various additives. According to the nature of the binder used, it is mainly divided into water-based coatings, alcohol-based coatings, resin coatings, etc. Among them, water-based coatings are widely used in actual production because of their low cost. However, water-based coatings are easy to collapse and stick to sand when the coating is cleaned, and most of the products still have defects in the performance of the products. described effect