3D printing precoated sand and preparation method thereof

Abstract

The invention relates to precoated sand and a preparation method thereof, in particular to 3D printing precoated sand and a preparation method thereof. The 3D printing precoated sand is prepared fromthe following raw materials in parts by weight: 80-90 parts of silica sand, 50-60 parts of graphite powder, 10-15 parts of lignin, 1.2-1.6 parts of sodium hexametaphosphate, 3-5 parts of pyrethroids compound, 3-5 parts of nitrile rubber, 3-5 parts of maltose, 10-20 parts of silica sol and 20-25 parts of phenolic resin. The 3D printing precoated sand provided by the invention is excellent in mechanical property, high in curing speed and good in high-temperature resistance, and addition of chemical components is reduced. The preparation method of the 3D printing precoated sand provided by the invention is simple to operate, and the process parameters are strictly controlled, so that the product quality of the precoated sand is finally guaranteed.

Description

technical field [0001] The invention relates to a coated sand and a preparation method thereof, in particular to a 3D printing coated sand and a preparation method thereof. Background technique [0002] 3D printing (3DP) is a kind of rapid prototyping technology. It is a technology based on digital model files and using bondable materials such as powder coated sand to construct objects by layer-by-layer printing. 3D printing saves processes such as mold opening and core making, greatly shortens the development cycle of new products, and has extremely broad development prospects. [0003] The traditional coated sand 3D printing core-making process has been very mature. 3D printing has extremely high requirements for coated sand, and the finished product quality of coated sand is directly related to the molding quality of sand cores; in addition, the traditional coated sand 3D core-making molding time is slow, the coated sand takes a long time to cure, and the production effi...

AI Technical Summary

Problems solved by technology

3D printing has extremely high requirements for coated sand, and the finished product quality of coated sand is directly related to the molding quality of sand cores; in addition, the traditional coated sand 3D core-making molding time is slow, the coated sand takes a long time to cure, and the production efficiency is low. Moreover, the chemical composition of the coated sand formula is high, polluting the environment

[0004] For example, the Chinese invention application whose publication number is CN 104858357 A is called a kind of coated sand with good high temperature resistance and compactness and its preparation method. Its components contain urotropine, magnesium chloride, dibutyl phthalate, Calcium hydroxide, boric acid and other chemical components, and whether its curing speed is improved compared with traditional coated sand, the patent document is not disclosed; another example is the Chinese invention application with the publication number CN 105903888 A, which is named as a kind of high temperature resistant easy The collapsed coated sand contains various chemical components such as sodium metasilicate, polyvinyl alcohol, and urotropine. Although the strength and air permeability have been improved, there is no specific disclosure of whether the curing speed has been improved.