Environment-friendly casting coated sand and method for preparing the coated sand

Abstract

The invention discloses an environment-friendly casting coated sand, which is prepared by the following raw materials in parts by weight: 70-75 parts of quartz sand, 0.2-0.3 part of calcium stearate, 4-6 parts of corncob powder, 13-15 parts of magnesium olivine sands, 2-3 parts of water, 0.7-1 part of urotropine, 4-6 parts of a thermoplastic phenolic resin, 3-5 parts of isopropanol, 5-7 parts of Portland cement, 2.5-4 parts of boric acid, and 5-7 parts of a synergistic agent. An inorganic silicate binder is added into the environment-friendly casting coated sand, so that the use amount of the phenolic resin is reduced and the environment-friendly casting coated sand is still good in cohesiveness and strength; the boric acid is added so that the heat resisting property of the product is improved; the synergistic agent prepared by a special process is added into the environment-friendly casting coated sand, so that liquidity, breathability, heat dispersion and strength of the coated sand are enhanced, and the surface of the environment-friendly casting coated sand isn't easy to crack and deform. By adopting the prepared product, the environmental pollution can be alleviated and the production cost is reduced, the amount of generated gas is low, the casting quality is high and the casting surface is smooth.

Description

technical field [0001] The invention relates to the technical field of molding sand, in particular to an environment-friendly casting coated sand and a preparation method thereof. Background technique [0002] Coated sand refers to the molding sand or core sand that is covered with a solid resin film on the surface of the sand grains before molding. In recent years, the production process of thermal coated sand has been widely used, that is, preheat the sand to a certain temperature, add resin to melt it, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, Cool, crush and sieve to obtain coated sand. Due to the advantages of high strength, low gas generation, high dimensional accuracy of production castings, smooth surface and easy storage, coated sand has been widely used in recent years. Most of the existing binders for preparing coated sand for foundry are resins, and organic resins have an odor. During the entire process of...

AI Technical Summary

Problems solved by technology

Most of the existing binders for preparing coated sand for foundry are resins, and organic resins have an odor. During the entire process of foundry production, from sand mixing, core making, pouring, cleaning to waste sand treatment, they will have adverse effects on the environment

Most inorganic resins are derivatives of petroleum, which are non-renewable resources and costly