The mold which can the phenol resin and its production manner for shell mold and the resin coated sand for shell mold and making use of that

摘要

The yield of the tar when casting is little, in addition low it is coefficient of thermal expansion and also, it becomes and, the resin coated sand which can the phenol resin for shell mold where you can obtain the mold whose Characteristic is higher profitably making use of, and that, furthermore it offers the mold which can making use of the resin coated sand which catches. With phenol, making use of naphthols, as those phenol components the reaction are obtained in aldehydes, the phenol resin which possesses useful property by using oxalic acid as that reaction catalytic converter, the divalent metal salt and/or, was obtained.