Quick-drying alcohol-based casting coating and preparation method thereof

Abstract

The invention discloses a quick-drying alcohol-based casting coating and a preparation method thereof. The casting coating comprises, by weight, 10-20 parts of graphite, 20-30 parts of soil-like graphite, 50-60 parts of flake graphite, 2-4 parts of lithium-based bentonite, 1.5-2.5 parts of resin, 4-6 parts of lime powder, 2-3 parts of magnesium powder and 100-130 parts of ethyl alcohol. The selected refractory powder materials have a particle size of 240-300-mesh. The preparation method comprises the following steps that phenolic resin is dissolved in ethanol; after the lithium-based bentoniteis prepared into paste through water and is repeatedly pressed, and the lithium-based bentonite is uniformly stirred with 25 parts of ethanol, and then processed for 20 minutes by a high-speed dispersing machine; and all refractory powder materials, dextrin and a prepared phenolic resin solvent, the prepared lithium-based bentonite paste, the ethanol and the like are put into a stirrer to be fully stirred evenly, and then are processed by the high-speed dispersing machine for about 60 minutes. The coating is used for casting a cast iron large part and an iron alloy part, the suspension stability is good, the coating has excellent thixotropy and levelling property, the painting property is good, the foaming amount is small, the anti-sticking property is good, the coating strength is high,the surface defect of the casting can be effectively prevented, the surface of the casting is smooth, the preparation process is simple, and the operation is easy.

Description

technical field [0001] The invention belongs to the technical field of casting coatings, and in particular relates to a quick-drying alcohol-based casting coating and a preparation method thereof. Background technique [0002] Foundry coatings refer to casting auxiliary materials coated on the surface of the cavity or sand core to improve their surface refractoriness, chemical stability, resistance to liquid metal erosion, anti-sand sticking and other properties. Casting coatings can be made into slurry, paste Shaped or powdered, it is coated on the surface of the core by spraying, brushing, invading, sulfur and other methods. As the output, quality and export volume of castings in my country increase year by year, the requirements for the amount and quality of casting coatings are also getting higher and higher. Compared with water-based coatings, alcohol-based coatings are widely used because they only need to be ignited to dry or volatilize to dry, and have the advantage...

AI Technical Summary

Problems solved by technology

However, the improvement of the surface precision of large cast iron and ferroalloy parts is not good, cracks and gaps are likely to exist between the coatings, and sand particles on the surface of the molding sand infiltrate and adhere to the surface of the casting, which affects the quality of the casting