INORGANIC COMPOSITE PHOSPHATE BINDER FOR 3D SAND PRINTING, AND PREPARATION METHOD THEREOF

摘要

Disclosed are an inorganic composite phosphate binder for 3D sand printing, and a preparation method thereof, the inorganic composite phosphate binder for 3D sand printing comprising the following components: aluminum hydroxide, magnesium carbonate, boric acid, 85% industrial grade phosphoric acid, urea, xylitol, D-sorbitol, citric acid, aluminum tripolyphosphate, aluminum dihydrogen tripolyphosphate, and deionized water. The components expressed in percentage by mass are respectively: 4.5%-9.5% of aluminum hydroxide, 1%-4% of magnesium carbonate, 2.5%-6.5% of boric acid, 30%-70% of 85% industrial grade phosphoric acid, 0.5%-1.5% of urea, 1%-3% of xylitol, 1%-3% of D-sorbitol, 0.5%-1.5% of citric acid, 1.5%-6.5% of aluminum tripolyphosphate, 1.5%-6.5% of aluminum dihydrogen tripolyphosphate, and 7%-37% of deionized water. The inorganic composite phosphate binder obtained from the preparation method has a low viscosity and a high binding strength. The binder has a low residual strength and an improved collapsibility after being baked at a high temperature of 600°C or above, and also has an improved resistance to moisture absorption.