The heat hardening mechanism of starch composite binder for sand mold (core) was studied by way of IR spectra. It is thought that the bonding strength of molding sand is mainly depended on the strength of the adhesive membrane itself. During heating the binder at certain temperature between 160 similar to 200 degreesC for one hour, a special composite structure is formed because of the interactions between different components, thus, it has higher low-temperature drying strength, better humidity resistance and higher high-temperature strength.
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