Alcohol-based non-zirconium composite refractory aggregate spray paint for wet cast steel and preparation method thereof

Abstract

The invention discloses an alcohol-based non-zirconium composite refractory aggregate spray paint for wet cast steel and a preparation method thereof. The spray paint is prepared from the components in parts by weight: 65-70 parts of mullite powder, 30-35 parts of magnesium aluminum spinel powder, 8-10 parts of cordierite flour, 2-5 parts of forsterite powder, 2.0-2.5 parts of magnesium silicate aluminum powder, 1-1.5 parts of calcium bentonite, 4-5 parts of water, 3-5 parts of ludox, 2-3 parts of modified rosin ester, 0.3-0.5 part of butyral resin, 41-54 parts of methyl alcohol, 15-20 parts of grain ethanol, and 10-15 parts of isopropanol. The alcohol-based non-zirconium composite refractory aggregate spray paint disclosed by the invention is low in cost; and the alcohol-based non-zirconium composite refractory aggregate spray paint with high cost can be replaced for spraying green sand.

Description

[0001] technical field [0002] The invention belongs to the technical field of molding materials for casting, and in particular relates to an alcohol-based non-zirconium composite refractory aggregate spray coating for wet cast steel and a preparation method thereof. Background technique [0003] In foundry production, steel castings produced by sand molding process account for more than 90% of the total output of steel castings. The types of sand molds used in the production of steel castings generally include sodium silicate sand, resin sand, clay green sand, etc. In order to prevent steel castings from sticking sand defects, these sand molds need to be coated with casting coatings. At present, the sand mold coatings used in the production of steel castings mainly include alcohol-based zircon powder coatings, corundum powder coatings, quartz powder coatings, and magnesia powder coatings. Among these coatings, the anti-sand sticking effect of steel castings is the alcoh...

AI Technical Summary

Problems solved by technology

[0006] However, the alcohol-based non-zirconium single refractory aggregate coating is used for wet spraying, and the anti-sticking effect is far inferior to that of the alcohol-based zircon powder coating, and it is easy to form sticky sand or sand inclusion defects near the gate of the steel casting.

The reason is that the refractory aggregate is generally a single refractory powder such as corundum, magnesia, mullite, etc. These refractory powders have high structural and chemical stability at high temperatures, are not prone to phase change, and do not even react with iron oxide. , no low melting phase is formed, the coating is loose, and the gap of the coating expands under the high temperature of molten steel, and there is no high-viscosity liquid substance to fill, so it is impossible to form a refractory isolation layer, and the molten steel is easy to penetrate, so that the castings have sand sticking defects

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