Powder evanescent mode casting paint and application method and application thereof

Abstract

The invention discloses powder evanescent mode casting paint and an application method thereof. The powder paint comprises the following components in percentage by weight: 88.9-89.7% of refractory aggregate, 3.7-4.5% of sodium base bentonite, 0.78-1.23% of polyethyl alcohol, 0.82-1.85% of aluminum dihydrogen phosphate, 0.32-0.44% of sodium carboxymethylcellulose, and 3.8-4.8% of expanded graphite. During preparing, all powder is added in a mixer for dry mixing to reach an uniform state to obtain the finished powder evanescent mode casting paint. Water by 23.5-37 weight% of the powder paint is firstly added in the mixer; the mixer is started; the powder paint is slowly added in the mixer; after materials are added, the stirring is continued by 1-2 hours; and then, an evanescent mode can be coated by the paint. The paint can achieve the effect of long-time storage without deteriorating by adding no formaldehyde in the raw materials; no surface active agent is added in the raw materials to prevent the trouble of adding a defoaming agent to defoam in subsequent use; the finished product is higher in strength at normal temperature or high temperature; and the paint is excellent in permeability, and cannot release poisonous substances.

Description

technical field [0001] The invention relates to a casting coating, in particular to a powdery lost foam casting coating and a method for using the coating. The coating is safe, environmentally friendly, does not deteriorate, has good air permeability, low cost and is convenient to use. Background technique [0002] Lost foam casting coatings are an integral part of the lost foam process. Coatings are generally provided by specialized companies. Traditional lost foam coatings are usually supplied in thin paste or diluted form, which require packaging barrels, which are inconvenient to recycle. The coating has poor air permeability, and the gas products of the foam model gasified by high-temperature molten metal are difficult to escape, and castings are prone to gas defects. There is also the problem of paint deterioration during storage, because the additives used in traditional lost foam paints often use syrup or pulp or white latex, which are easy to absorb moisture, have ...

AI Technical Summary

Problems solved by technology

Traditional lost foam coatings are usually supplied in thin paste or diluted form, which require packaging barrels, which are inconvenient to recycle. The coating has poor air permeability, and the gas products of the foam model gasified by high-temperature molten metal are difficult to escape, and castings are prone to gas defects. There is also the problem of paint deterioration during storage, because the additives used in traditional lost foam paints often use syrup or pulp or white latex, which are easy to absorb moisture, have high gas generation, and low drying strength, which can easily lead to paint deterioration. Formaldehyde added to prevent paint fermentation

However, formaldehyde is toxic and not environmentally friendly. After use, the formaldehyde in the paint will slowly volatilize and be absorbed by the human body, causing great harm to the human body. It is generally required to prohibit its use.

Surfactants are often used in traditional lost foam coatings, which are prone to generate a large number of air bubbles. Therefore, defoamers need to be used to defoam when preparing coatings, which not only deteriorates the performance of coatings, but also makes the operation very troublesome.

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