| 摘要 |
A binder composition for use in the manufacture of foundry moulds and cores comprises (A) a phenolic resin component including at least one phenolic resil selected from phenolic resole resins and phenolc novolak resins, sufficient solvent to reduce the viscosity of said phenolic resin component to below about 1000 centipoises, said solvent comprising a liquid ester of an alkoxyaliphatic acid, (B) an isocyanate component having a functionality of two or more and (C) sufficient catalyst to catalyze the reaction between components (A) and (B). The binder compositions when used in the manufacture of foundry moulds and cores gives cores and moulds with good strength, even after they have been washed with water-based core washes. |
