Foundry resins
OwnerKenneth R. Kurpleinventor
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Abstract
A process for making sand cores or molds is disclosed; the completed cores and molds as well as a binder for holding the sand particles together. The resin binder is used in the process and in the finished product comprising lignin dissolved in a suitable solvent reacted on or cured with an isocyanate material. Curing can be accomplished by the use of an amine along with a catalyst if desired. A polyether polyol may be integrated with the lignin to vary the physical characteristics of the binder.
Claims16
The process of making a sand core or mold comprising the steps of mixing sand with lignin which has been dissolved in a suitable solvent material along with an isocyanate, forming said mixture into a core or mold and allowing said mixture to cure, said lignin and isocyanate being present in an amount in the range of 1/4% to 10% by weight of the sand.
A foundry core or mold composition curable to a hardened state comprising sand particles mixed with a mixture of lignin dissolved in a suitable solvent material along with an isocyanate, said lignin and isocyanate being present in an amount in the range of 1/4% to 10% by weight of the sand.
Dependencies are inferred from the claim text.