Molding sand sodium silicate binding and collapsing agent for casting

Abstract

The invention discloses a molding sand sodium silicate binding and collapsing agent for casting. The agent comprises raw materials in percentage by weight as follows: 94.5-98% of sodium silicate, 1.5-2.5% of glucose powder, 0.2-2% of light calcium carbonate powder, 0.2-0.5% of a suspending agent and 0.1-0.5% of a preservative. According to the agent, the sodium silicate, an organic collapsing agent, an inorganic collapsing agent, the suspending agent and the preservative are successfully integrated, the agent is good in high-temperature collapsibility, excellent in sand binding preventing capability and capable of being adapted to multiple hardening methods, the dry strength of molding sand is high, the wet binding force of the molding sand is large, the drying time after CO2 hardening is shortened, and the recovery rate of used sand can be significantly increased.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a molding sand water glass adhesive agent for casting. [0003] Background technique [0004] For the shortcomings of the poor collapsibility of the water glass sand binder, many foundry workers have made great efforts and achieved considerable achievements. Many collapsing agents and modifiers have been put into production and application, and the collapsibility has been improved. Many new problems have arisen, such as decreased core strength, poor adaptability, and unstable product quality. Only introducing organic disintegrating agent in water glass can not effectively solve the problem of high temperature disintegrating and disintegrating agent uniformity. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a mold...

AI Technical Summary

Problems solved by technology

[0004] For the shortcomings of the poor collapsibility of the water glass sand binder, many foundry workers have made great efforts and achieved considerable achievements. Many collapsing agents and modifiers have been put into production and application, and the collapsibility has been improved. Many new problems have arisen, such as core strength decline, poor adaptability, and unstable product quality

Only introducing organic disintegrating agents into water glass cannot effectively solve the problems of high temperature collapsing and the uniformity of disintegrating agents