Formula of water glass modifying additive and production process and using method thereof

Abstract

The invention relates to a water glass modifying additive for casting and a production process and a using method thereof. The modifying additive consists of the following components in percentage by mass: 40 to 65 percent of styrene-acrylate emulsion, 0 to 10 percent of urea resin, 0.1 to 0.5 percent of quaternary ammonium salt and 25 to 55 percent of water. Used water glass sand is subjected to dry reclamation, the residual Na2O content of the used sand is controlled in a certain range and the water galls with ultra-low modulus is matched with the modifying additive so that the available time for preparing molding sand by mixing all or partial reclaimed sand can be prolonged and the molding sand has good process performance; and the reclamation rate of the used water glass sand can reach over 85 percent. The water glass modifying additive is directly added into the water glass at normal temperature and stirred uniformly without a fussy heating-cooling process so as to facilitate the operation on a molding site.

Description

Technical field: [0001] The invention relates to an additive material for casting molding materials, in particular to a modification additive for casting water glass, and also relates to a production process and a use method of the additive. Background technique: [0002] Sodium silicate sand is one of the most widely used molding sands in foundry production. Water glass is not only cheap, but also does not release harmful gases during sand mixing, molding and pouring. Today, as environmental protection is paid more and more attention to, if sodium silicate sand can solve the two major problems of collapsibility and old sand reuse and regeneration, it is expected to become a kind of molding sand that is the first to realize pollution-free casting in casting production. In order to improve the performance of water glass, a modifier is added to the water glass to retard the aging of the water glass, enhance the bonding strength, and help improve the collapsibility. Chinese p...

AI Technical Summary

Problems solved by technology

Add this modifying agent in common water glass and make modified water glass, though can improve sand mold intensity, improve molding sand collapsibility, do not propose the method for solving for the recycling problem of modified water glass old sand; And its preparation The method is cumbersome, and multiple heating-cooling processes are required to modify the water glass, so it is not suitable for self-preparation by casting manufacturers, and the operability is poor in actual use.