Easily-collapsing green sand

Abstract

The invention discloses easily-collapsing green sand. The collapsible wet mold sand is prepared by the following components: clay, modified sodium bentonite, aluminum sulfate, titanium dioxide, coconut shell activated carbon, sodium silicate, tributyl citrate, polyvinyl acetate, lignocellulose, nanometer attapulgite, brown fused alumina powder and quartz sand. Through a mutual synergistic effect of the components with a specific ratio, the air permeability of the green sand can be improved, the strength of the green sand can be improved, the cost is low, in the working procedure time is short, a molding sand sintered layer is thin, a sand adhesion phenomenon seldom occurs, the casting surface quality is high, the surfaces are easy to clean, collapsibility of old sand is good and the reuse rate is high, the defects of shrinkage porosity and sand holes of castings are greatly reduced, the problems of sand clamping, recesses, scabs and box collapse caused by an expansion defect of green sand can be avoided, the pass percent and the yield of the castings are improved, the production cost is reduced, and the easily-collapsing green sand has extremely high economic benefits, and can be widely applied.

Description

technical field [0001] The invention relates to the field of molding sand production, in particular to an easily collapsible wet molding sand. Background technique [0002] Green sand is also called green sand. In foundry production, the sand mixture uses bentonite as a binder, then mixes with water and other additives, and then it can be used for molding and core making. The sand mold (core) can be poured directly without drying. In the foundry industry, this kind of sand is called wet mold sand. However, the existing green mold sand has poor air permeability and is easy to bond, which makes the casting difficult to peel off and makes the surface of the casting rough. Contents of the invention [0003] The purpose of the present invention is to provide a kind of easy collapsible green molding sand. [0004] The present invention is realized through the following technical solutions: [0005] A kind of easily collapsible damp molding sand, which is made of the following...

AI Technical Summary

Problems solved by technology

In foundry production, the sand mixture uses bentonite as a binder, then mixes with water and other additives, and then it can be used for molding and core making. The sand mold (core) can be poured directly without drying. In the foundry industry, this kind of sand is called wet mold sand. However, the existing green mold sand has poor air permeability and is easy to bond, which makes the casting difficult to peel off and makes the surface of the casting rough