Additive Manufacturing Technology by Fran Sand Mold using Sintered Artificial Sand Coated with Solid Catalyst

Abstract

The solid catalyst coated sand is coated with meta-xylene sulfonic acid, and the catalytic action causes cross-linking by the methylene bond of the methylol groups of the furfuryl alcohol, etc. , and growth into a three dimensional network structure. At this time, large amounts of water are produced. If the water can be discharged effectively, the reaction rate is also improved. Anhydrous magnesium sulfate changes the state of water generated during the reaction into magnesium sulfate hydrate by hydration. This hydration is very fast, resulting in the dramatic increase in the hardening rate of the binder, which contributes the improvement of the dimensional accuracy of the mold and realizes ultra-high performance 3D laminated molding mold.