Shuttering hardening agents

Abstract

The invention relates to shuttering hardening agents. The shuttering hardening agents mainly include, by weight, 10-15% of hexahydrate crystallization of aluminum chloride, 22-25% of dihydrate flaky calcium chloride, 1.5-2% of anhydrous boric acid, 0.1-0.15% of permeating agents and the balance clear water. The hexahydrate crystallization of aluminum chloride and the dihydrate flaky calcium chloride serve as the main materials of the hardening agents, so that the defect that the work conditions are seriously worsened as ammonium chloride is used as the main materials of shuttering hardening agents is fundamentally overcome, and the other properties are better than those of the ammonium chloride hardening agents. The shuttering hardening agents have the characteristics of being high in hardening speed, shortening the process and shortening the production period, avoid environmental pollution and obviously improve economic benefits.

Description

Technical field

[0001] The invention relates to a mold shell hardener for water glass investment casting. Background technique

[0002] The precision casting industry is faced with two challenges: one is the continuous improvement of the quality of castings; the other is the increasingly stringent requirements for environmental protection, clean production and human health. Therefore, a higher level of hardener for precision casting molds is proposed. Claim.

[0003] At present, most of the precision casting industry uses water glass as the binder, and ammonium chloride or magnesium chloride or aluminum chloride as the hardener.

[0004] Ammonium chloride has severely deteriorated working conditions due to the production of ammonia gas, and the mold shell has poor bonding strength and quality cannot be effectively controlled; the viscosity of magnesium chloride solution is large, which affects the hardening and drying speed, and is easy to produce due to the high content of impuriti...