| 摘要 |
PURPOSE:To increase a curing rate by mixing a resin component, curing agent component and curing catalyst for which 1-alkyl substituting group of imidazole at a specific ratio and using such mixture. CONSTITUTION:An org. solvent soln. contg. a phenolic group soluble in an org. solvent contg. a benzilic ether group and methyrol group is used as the resin component and an org. solvent contg. polyisocyanate is used as the curing agent component. The 1-alkyl substituting body of imidazole is dissolved in an org. solvent and the soln. is mixed as the curing catalyst with the above- mentioned solvents. Such mixture is used. These materials are mixed at such a ratio as 0.1-3.0wt% resin component, by the weight of the aggregate for a casting mold, 0.1-3.0wt% curing agent component and 0.001-0.5wt% curing catalyst. The rapping time in the stage of molding is thereby reduced to a short period of about 10-15sec and the molding cycle is considerably reduced.
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