| 摘要 |
PROBLEM TO BE SOLVED: To provide inexpensive binder for a mold by using polyisocyanate containing no solvent component, while holding necessary characteristics for the mold, such as strength of mold, shelf life, usable time of the binder-coated sand. SOLUTION: This binder composition for mold is composed of phenol resin solution containing 1-20 wt.% alkylbenzene having 7.1-7.0 for SP value (solubility parameter) as the solvent component and the polyisocyanate containing at least two NCO radicals in the molecule which has no solvent component.
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