Novel environment-friendly molding sand adopting carbon nano tube modified animal glue as adhesive and preparation method thereof

Abstract

The invention discloses novel environment-friendly molding sand adopting carbon nano tube modified animal glue as an adhesive. The molding sand is characterized in that modification treatment is carried out on animal glue through utilizing carbon nano tubes to prepare a novel molding sand adhesive; during the preparation process, the carbon nano tubes are subjected to swelling treatment in an acid ionic liquid, so as to improve the dispersity of the carbon nano tubes in an animal glue solution; finally, cross linking is carried out through glutaraldehyde, and the adhesive which is high in environmental protection property, high in bonding strength, low in coefficient of thermal expansion and high in thermal deformation resistance is obtained; and besides, sodium alginate added during the sand mixing process can have cross linking hybridization reaction with calcium chloride to form high-air permeability micropore channels, so that a molding sand product with good air permeability and molding strength is obtained. A casting poured through the prepared molding sand is high in quality, the industry is economic and environment-friendly, and the molding sand has wide application prospect in the field of casting.

Description

technical field [0001] The invention relates to the technical field of foundry sand, in particular to a novel environment-friendly molding sand using carbon nanotube modified animal glue as a binder and a preparation method thereof. Background technique [0002] Molding sand refers to the material used for molding in casting. Molding sand is generally made of molding materials such as casting raw sand, molding sand binder and auxiliary additives in a certain proportion. Molding sand can be divided into clay sand, water glass sand, cement sand, resin sand, etc. according to the different binders used. 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. Generally speaking, the performance of molding sand is mainly reflected in the following aspects: (1) high strength and thermal stability; (2) good fluidity, that is, the ability of molding sand...

AI Technical Summary

Problems solved by technology

At present, the mainstream inorganic binder type sand in the market mainly has defects such as poor collapsibility, easy moisture absorption, and low utilization rate of old sand; although resin sand has good collapsibility and high casting precision, it is easy to produce polluting gas during the pouring process