Modified inorganic binder sand with collapsibility and preparation method

Abstract

The invention discloses modified inorganic binder sand with collapsibility. The modified inorganic binder sand comprises silica sand, a modified inorganic binder and a powder collapsibility agent, the modified inorganic binder comprises an inorganic binder and a modifier, the inorganic binder is a binder based on silicate, and the modifier comprises phosphate, borate and meta-aluminate and is used for modifying the inorganic binder; the powder collapsing agent is a mixture of inorganic salts and organic powder; comprising the following substances in parts by weight: 100 parts of silica sand, 2-5 parts of a modified inorganic binder and 1-3 parts of a powder collapsing agent, the collapsibility modifier is added in the modification process of the inorganic binder, and the powder collapsibility agent is added in the sand mixing process, so that the collapsibility of the inorganic binder type sand is remarkably improved, the residual strength of an inorganic binder sand mold is greatly reduced after pouring, a casting is easy to clean, the casting can be easily stripped from the molding sand, sand cleaning is facilitated, and the labor intensity of workers is reduced.

Description

technical field [0001] The invention relates to the field of casting auxiliary materials, in particular to a collapsible modified inorganic binder sand and a preparation method thereof. Background technique [0002] In the 21st century, global politics, economy and society have been greatly developed, and human society’s awareness of environmental protection has been greatly strengthened. Under this background, the state has continuously issued various guidelines and policies to guide and guide society. Transforming to sustainable development, the high energy consumption and high pollution in the foundry industry are incompatible with this trend. This phenomenon has attracted the attention of foundry workers all over the world. Green casting and environmental protection have become the common aspiration of foundry industry. From resin sand Since the large-scale application in casting production, the chemical pollution produced by it has become increasingly serious. Researche...

AI Technical Summary

Problems solved by technology

However, the following shortcomings often occur: (1) sometimes the prepared sand core has low strength and poor moisture resistance; (2) the amount of binder added during molding and core making; (3) the residual strength of the core sand is high Sand core collapse is poor, and sand production is difficult; (4) The workload of welding repair and cleaning of castings is heavy; (5) It is difficult to regenerate old sand, etc.

Through the continuous deepening of research on water glass by scientific researchers from various countries, the problems of the amount of water glass added in the molding process and the strength of water glass sand have been continuously solved, but the problem of poor collapsibility of water glass sand is still a problem in the foundry industry. The bottleneck of development. In the prior art, because the inorganic binder does not contain easily decomposable substances and other components, although the inorganic binder sand has high strength and other performance indicators, it does not have good collapse performance. It is difficult to peel off the molding sand, and it is difficult to clean the castings. The above problems need to be solved urgently

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