| abstract |
(57) [Problem] To achieve high mechanical strength of a mold, improve easy collapse after casting, and improve dimensional stability by suppressing thermal expansion of the mold. SOLUTION: The binder comprises a resin composition containing a triazine derivative and a phenol as an essential component, and the binder comprises phosphoric acid. Forming a mold using a binder composition for a mold that is at least one selected from the group consisting of esters, halogen compounds, organic carboxylate salts, thermoplastic resins, glycols, alkali metal nitrates, amino acids, and amino acid salts. I do. |