Phenol resin composition for shell molding, resin-coated sand for shell molding, and shell molding die obtained using the same

摘要

Provided are a phenol resin composition for shell molding, from which a molding die having a low thermal expansion coefficient and high deflectability can be advantageously formed, a resin-coated sand obtained using the same, and a shell molding die obtained using such a resin-coated sand. A naphthol is used together with a phenol. These phenol components are caused to react with an aldehyde to obtain a phenol resin. The phenol resin is combined with a fatty acid amide to constitute a phenol resin composition for shell molding, which is capable of exhibiting useful die characteristics.