High-permeability sand-burning-preventing paint for casting and preparation method thereof

Abstract

The invention discloses high-permeability sand-burning-preventing paint for casting and a preparation method thereof. The high-permeability sand-burning-preventing paint is prepared from the following raw materials: refractory aggregate, a binding agent, an activating agent, a thickening agent, a suspending agent, a defoaming agent and a carrier, wherein the masses of the binding agent, the activating agent, the thickening agent, the suspending agent, the defoaming agent and the carrier respectively account for 0.5-2.5 percent, 0.01-0.05 percent, 0.1-0.5 percent, 1.5-5.0 percent, 0.01-0.1 percent and 40-220 percent of the mass of the refractory aggregate; the refractory aggregate is a mixture of one or two of zircon powder and chromite fines in any proportion; the binding agent is phenolic resin or a mixture of the phenolic resin and one or more than two of oxidized rosin and ethyl silicate; the activating agent is alkylphenol ethoxylates; the carrier is ethanol; the thickening agent is polyvinyl butyral; the suspending agent is lithium bentonite; and the defoaming agent is normal butanol.

Description

technical field [0001] The invention relates to a coating and a preparation method thereof, in particular to a high-permeability anti-stick sand coating for casting and a preparation method thereof. Background technique [0002] There are many types of casting coatings, which can be roughly divided into two categories: water-based coatings and organic solvent coatings. Among them, the organic solvent coating can be cured after being ignited after coating. It can be used in conjunction with various self-setting sand processes without drying, which can shorten the production cycle, simplify the process, save energy, and reduce the investment in drying equipment. It is widely used in the foundry industry. A widely used quick-drying coating has been widely used in the production of steel, iron and non-ferrous castings. However, the progress in the production and application of large, especially thick and large steel castings is slow, because the pouring temperature of thick and...

AI Technical Summary

Problems solved by technology

Practice has proved that the coating obtained by this patent application has low penetration to the sand mold and the high-temperature strength of the coating is not enough. The stability of the coating on steel parts under long-term high temperature environment is poor, the coating is easy to crack and fall off, and the molten steel is easy to break through the coating and penetrate into the sand mold

[0004] Chinese patent application (application number 200910046096.4) discloses a zircon powder alcohol-based coating for large castings, and the refractory aggregate is made of ZrO 2 More than 65% of zircon powder, the paint binder is combined with oxidized rosin resin and thermoplastic phenolic resin, and the weight ratios of the paint are: oxidized rosin resin 0.3-0.6%, thermoplastic phenolic resin 0.5-0.8%; this patent application Although it can form a dense film on the surface of the sand mold to block the influence of moisture in the sand on the coating layer, it can also make the bonding system maintain its effective and stable performance on a certain high temperature gradient, and resist the continuous high temperature erosion of molten steel, thus Guarantee a certain quality of the surface of the casting; however, the oxidized rosin and thermoplastic phenolic resin used as the binder are easy to burn at high temperature, the coating strength at high temperature is poor, and the casting is prone to sand inclusions; in addition, the coating obtained by the patent application does not add other auxiliary materials. Penetrating agent, so its penetrating power is not ideal, and it cannot effectively fill the gap between sand grains and prevent mechanical sand sticking; in addition, the carrier is all isopropanol, and the cost is too high

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