FIELD: foundry. SUBSTANCE: one component of blend is carbamide-furane resin with molar ratio of carbamide, formaldehyde, and furfuryl alcohol 1: (1.6-1.8): (0.7-1.0) which includes complex hardener containing aqueous solutions of wastes of copper and/or its alloys treated with nitric acid. Molar ratio of initial components ensures formation of resin with reduced content of free formaldehyde up to 1.0% in common with complex hardener. EFFECT: improved performance characteristic of blend. 2 cl, 3 tbl
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Authors
Dates
1997-02-20—Published
1994-03-11—Filed