Inorganic binder for 3D printing and preparation method thereof

Abstract

The invention provides an inorganic binder for 3D printing and a preparation method thereof, the inorganic binder for 3D printing comprises an inorganic binder and a powder accelerator which are cooperatively used, and the mass part ratio of the inorganic binder to the powder accelerator is 100: (10-60); the inorganic binder comprises the following raw materials in parts by mass: 40-70 parts of a sodium silicate solution, 10-40 parts of a potassium silicate solution, 0.5-10 parts of gamma aluminum oxide, 0.5-15 parts of potassium hydroxide, 0.5-15 parts of sodium hydroxide, 0.5-10 parts of water-soluble epoxy resin, 0.5-10 parts of modified starch, 0.1-3 parts of a water reducing agent and 0.1-3 parts of a surfactant. The powder accelerant is prepared from the following raw materials in parts by mass: 40 to 70 parts of silica fume, 5 to 20 parts of superfine calcium oxide, 0.5 to 20 parts of superfine titanium oxide, 0.5 to 10 parts of superfine zirconium oxide, 1 to 10 parts of superfine zinc oxide, 1 to 10 parts of superfine yttrium oxide and 0.5 to 2 parts of graphite. When the inorganic binder is used, infrared heating or hot air is adopted as a hardening mode, and the use requirement for producing the 3D printing inorganic binder sand core can be met.

Description

technical field [0001] The invention belongs to the field of casting, and particularly provides an inorganic binder used in the production process of 3D printing sand cores and a preparation method thereof. Background technique [0002] At present, the sand binders used in foundry production include organic and inorganic. Most of the organic binders are resin polymers, which cause serious pollution in the casting application process, and more irritating gases are released during the molding and pouring process, which is harmful to the operation. cause bodily harm and seriously pollute the environment. With the country's emphasis on environmental protection and strict control of pollution emissions in the foundry industry, inorganic binders are increasingly valued by domestic and foreign foundry counterparts. There is no harmful gas in the production, molding, and pouring processes, and the old sand can be dried. Recycling is the most environmentally friendly foundry binder....

AI Technical Summary

Problems solved by technology

[0003] In the 1950s and 1960s, the water glass sand method was widely used to prepare sand cores. The disadvantage of this method is that the cores produced The strength is low. In order to obtain a high-strength sand mold, increase the amount of water glass added. Usually, the amount of water glass added is 8.0-10.0%, or even higher. After pouring, the residual strength of the sand mold is very high, and it is difficult to separate the casting from the sand.

In the past few years, inorganic binders and their use have been further researched and improved, which can reduce the amount of inorganic binders added, but they must be heated and cured, and the requirements for molds and tooling are stricter, while manual or production line molding at room temperature is still not available. A good way to replace resinous organic binders

[0004]In recent years, with the gradual application of 3D printing sand molds in the foundry industry, it reduces the mold production cycle, small batch production, fast molding, integrated molding, and as few components as possible Core and other advantages are widely recognized, but currently 3D printing sand molds are mainly 3D printing laser sintering coated sand molds and 3D printing furan resin sand molds and other organic binder sand molds. produce

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