A kind of composite phosphate inorganic binder for 3D sand printing and preparation method thereof

Abstract

The invention belongs to the field of casting auxiliary materials, and relates to a composite phosphate inorganic binder for 3D sand mold printing and a preparation method thereof. A composite phosphate inorganic binder for 3D sand mold printing comprises the following components: aluminum hydroxide, Magnesium carbonate, boric acid, 85% industrial phosphoric acid, urea, xylitol, D-sorbitol, citric acid, aluminum tripolyphosphate, aluminum dihydrogen tripolyphosphate, deionized water, wherein the mass percentage ratio of each component is: Aluminum hydroxide 4.5%-9.5%, magnesium carbonate 1%-4%, boric acid 2.5%-6.5%, 85% industrial phosphoric acid 30%-70%, urea 0.5%-1.5%, xylitol 1%-3%, D‑sorbitol 1%‑3%, citric acid 0.5%‑1.5%, aluminum tripolyphosphate 1.5%‑6.5%, aluminum dihydrogen tripolyphosphate 1.5%‑6.5%, deionized water 7%‑37%. The beneficial effects of the technical solution of the present invention are: the prepared composite phosphate inorganic binder has low viscosity; high bonding strength; after being baked at a high temperature above 600°C, its residual strength is low, indicating that the binder has Excellent collapsibility; the adhesive has excellent resistance to moisture absorption.

Description

technical field [0001] The invention belongs to the field of casting auxiliary materials, and in particular relates to a composite phosphate inorganic binder for 3D sand mold printing and a preparation method thereof. Background technique [0002] Three Dimensional Printing (Three Dimensional Printing, 3DP) was proposed by E. Sachs et al. in 1992. Based on the principle of inkjet printers, material droplets are ejected from nozzles and solidified layer by layer according to a certain path. [0003] Together with robots and the Internet, 3D printing technology is called the main symbol of the third industrial revolution. At present, some industrial-grade 3D printers have been used in foundry production services, mainly for rapid prototyping of castings, remaking molds, printing mold shells, sand cores, etc. [0004] At present, developed countries such as Germany and Japan have widely used 3D printing technology in the foundry industry. In China, 3D printing technology is i...

AI Technical Summary

Problems solved by technology

[0006] In the former Soviet Union, foundry workers tried to apply phosphate inorganic binders to the casting field, but because they could only be hardened by heating, and ordinary phosphate inorganic binders generally had high viscosity, Problems such as low strength, poor collapsibility and poor moisture absorption resistance have seriously restricted its application in traditional cast steel, cast iron and other fields, and further restricted its application in high-tech casting technology fields such as 3D sand printing.

[0007] 3D sand printing technology requires the binder to have low viscosity and fast hardening, and at the same time ensure that the sand strength increases in a short period of time. Ordinary phosphate inorganic binders cannot meet the needs of 3D sand printing, which directly hinders the development of phosphates. Application of Inorganic Binder in High-end Casting Field