LIGNITE-URETHANE BASED RESINS FOR ENHANCE FOUNDRY SAND PERFORMANCE

摘要

Described herein, in a preferred embodiment, is a leonardite-based polyurethane resin binder that may be used, among other applications, as a binder in combination with foundry aggregate, e.g., sand, for molding or casting metal parts. The binders described herein comprise a humic substance, preferably leonardite, first mixed with a foundry aggregate and then the humic-aggregate mixture is combined with a polymerizable polyol, an isocyanate, and a polymerization catalyst to make a polyurethane resin binder in situ in a foundry aggregate, such as sand. The lignite is added as a solid to the foundry aggregate, and improves the binder performance of the lignite-containing part of the binder components.

主权项

1. An article of manufacture comprising: a metal casting;
wherein the metal casting was made by a process comprising pouring a liquid metal into a foundry shape; wherein the foundry shape was made from a foundry mix; wherein the foundry mix was manufactured by admixing a lignite and a foundry aggregate to form a impregnated foundry aggregate; admixing a polymerizable polyol with the impregnated foundry aggregate; admixing a polymerizable isocyanate with the impregnated foundry aggregate; and admixing a polymerization catalyst with the impregnated foundry aggregate.