| 摘要 |
This invention relates to a solventless polyurethane no-bake foundry binder system comprising, as individual components (a) a polyol component comprisin g a polyether polyol, glycol, and an aromatic polyester polyol, (b) an organic polyisocyanate component, and (c) a liquid tertiary amine catalyst component . Foundry mixes are prepared by mixing the binder system with a foundry aggregate by a no-bake process. The resulting foundry shapes are used to cas t metal parts from ferrous and non-ferrous metals.
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