High-strength foundry casting sand and preparation method thereof

Abstract

The invention discloses high-intensity foundry casting sand and a preparation method thereof. The high-intensity foundry casting sand comprises the following raw materials in parts by weight: 45 to 65 parts of quartz sand, 20 to 30 parts of desert sand, 15 to 20 parts of illite, 12 to 18 parts of calcium carbonate powder, 5 to 10 parts of silicon boride, 2 to 3 parts of 3-isocyanatopropyltriethoxysilane, 8 to 12 parts of modified bentonite, 5 to 10 parts of emery powder, 4 to 8 parts of shale ash, 5 to 10 parts of malthacite, 3 to 5 parts of sodium alginate, 6 to 9 parts of light calcined powder, 3 to 7 parts of carbon nanofiber, 4 to 6 parts of polyethylene imine, 2 to 3 parts of polyvinyl butyral, and a proper amount of water. Compared with the traditional casting sand, the casting sand provided by the invention is relatively high in wet compression strength and tensile strength, further is excellent in heat resistance, plasticity and air permeability, is easy for pattern drawing and modeling, has the effect of bearing various external forces and high temperature, can improve casting quality obviously, and avoids defect of air holes produced by castings.

Description

technical field [0001] The invention relates to high-strength casting sand and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Molding sand is the material used for molding in casting. Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. The role of molding sand in foundry production is extremely important, and the casting waste caused by poor quality of molding sand accounts for about 30-50% of the total casting waste. The usual requirements for molding sand are: ① High strength and thermal stability to withstand various external forces and high temperatures; ② Good fluidity, that is, the ability of the molding sand to move between sand particles under the action of external force or its own gravity; ③Certain plasticity, that is, the ability of the molding sand to deform under the action of external force, a...

AI Technical Summary

Problems solved by technology

With the continuous development of casting technology, the requirements for the wet compressive strength and tensile strength of the molding sand are getting higher and higher, but the molding sand in the existing market cannot meet the above requirements. Therefore, it is urgent to develop a high-strength casting molding sand. to meet market demand