Moisture-absorption-resistant inorganic binder powder for casting, activation solution and use method

Abstract

The invention relates to anti-moisture-absorption type inorganic binder powder for casting, activation liquid and a use method of the anti-moisture-absorption type inorganic binder powder. The inorganic binder powder is prepared from the following components in percentage by weight: 0.5 to 3.0 percent of sodium silicate powder, 0.01 to 1.0 percent of sulfonate, 0.01 to 1.0 percent of aluminosilicate, 0.1 to 3.0 percent of silica fume, 0.01 to 1.0 percent of borax, 0.01 to 1.0 percent of sodium polyphosphate, 0.1 to 2.0 percent of maltodextrin, 0.1 to 2.0 percent of barium sulfate, 0.1 to 2.0 percent of lithium hydroxide and 0.1 to 2.0 percent of hydrophobic nano silicon dioxide. The activating solution is prepared from 1.0 to 5.0 percent of deionized water, 0.01 to 1.0 percent of amino silane coupling agent and 0.01 to 1.0 percent of organic acid. The corresponding use method comprises the following steps: preparing the composition A, the composition B, activating liquid, mixing sand and preparing the inorganic sand core. The inorganic binder powder and the activation liquid are convenient to store, transport and use, and the strength and moisture absorption resistance of the sand core can be improved.

Description

technical field [0001] The invention relates to the field of casting, in particular to an anti-hygroscopic inorganic binder powder for casting, an activating liquid and a using method. Background technique [0002] At present, in casting production, organic resins are mainly used as binders for efficient molding and core making. This has played a great role in improving the quality and production efficiency of castings, but in the process of its use, various resin chemical binder sand releases a large amount of toxic gases such as benzene, aldehyde, sulfur, etc., which not only pollutes the environment, but also poisons human body. [0003] Since the 1990s, countries around the world have successively carried out research on environmentally friendly inorganic sand technology. Compared with traditional organic resin binders, inorganic binders use liquid sodium silicate (water glass) as the main component, which does not generate harmful and toxic fumes, and does not require...

AI Technical Summary

Problems solved by technology

This kind of liquid inorganic binder needs to be prepared under certain temperature and pressure, the production cycle is long, transportation is inconvenient, and long-term storage will cause aging and volatilization to thicken the binder, so it is difficult to adapt to the secondary production of aluminum alloy in modern casting production. High-volume, high-efficiency core-making requirements for large-scale and complex hollow thin-walled aluminum alloy castings such as vehicle frames and motor casings

In addition, when liquid sodium silicate is used as a binder, the fluidity of the sand mixture is poor during sand mixing and sand shooting, which makes the compactness of the inorganic sand insufficient during the molding process, resulting in a decrease in the strength of the sand core and poor moisture absorption resistance.

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