Water-based self-drying casting paint, and preparation method and application method

Abstract

The invention provides a water-based self-drying casting paint, and a preparation method and an application method. According to the invention, 1-3% of sodium-based bentonite and water 1-1.5 times the weight of bentonite are uniformly stirred with high speed; the mixture is added in a sealed container and is subjected to standing, where the mixture is sufficiently wetted and activated, such that a liquid A is prepared; 0.1-0.4% of sodium carboxymethyl cellulose is dispersed by using ethanol with a concentration no lower than 95% according to a weight ratio of 1:1; water with an amount 30-50 times that of the mixture is added; the mixture is uniformly stirred and is subjected to standing and sufficient initiation; the mixture is mixed with the liquid A; the obtained mixture is stirred with a proper amount of water; a composite suspension is prepared by grinding by using a colloid mill; the suspension is mixed and grinded with 60-71% of mullite, 0.05-0.1% of a wetting agent, and 4-6% of a modified phosphate binder, such that a pasty paint is prepared; and the pasty paint is diluted by using water, such that the paint is obtained. After a reaction with an alcohol-based paint comprising magnesia powder, the paint can be self-dried. Therefore, cost of independent use of an alcohol-based paint or a water-based paint is greatly reduced, and the influence to the environment is greatly ameliorated.

Description

technical field [0001] The invention relates to the field of casting, in particular to a water-based self-drying casting paint and a preparation method and application method thereof. Background technique [0002] According to the difference of the carrier liquid, casting coatings are divided into two categories: alcohol-based casting coatings and water-based casting coatings. Alcohol-based casting coatings mainly use methanol and ethanol as carrier liquids. After being coated on the working surface of the mold (core), the coating is generally dried by ignition; , it is prone to coating blistering, poor bonding between the coating and the surface of the sand mold (core) or between the various coatings, the resulting dry coating is relatively loose, and the coating on the poorly bonded part is continuously washed by the molten metal during pouring It is easy to fall off from the surface of the sand mold (core), thus losing the functions of anti-sticking sand. In addition, th...

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Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a kind of water-based foundry paint for large castings and the preparation method of the paint, the paint through the modified phosphate binder in its own components and the magnesium in the primer The sand powder undergoes an exothermic reaction to achieve self-drying of the coating without baking, drying, etc., which saves energy, is easy to operate, and does not cause coating blistering, coating and sand mold (core) surface or each coating With defects such as poor bonding between layers, it has the advantages of non-flammable and non-explosive, non-corrosive, non-polluting, convenient transportation, safe operation, and low cost.

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