Method for the preparation of foundry sand compositions

Details Method for the preparation of foundry sand compositions Method for the preparation of foundry sand compositions

B - Operations, Transporting

22

C

B22C 1/22 (2006.01) B22C 1/18 (2006.01)

Patent

CA 2048773

METHOD FOR THE PREPARATION OF FOUNDRY SAND COMPOSITIONS (Docket No. 80,863- F) ABSTRACT OF THE DISCLOSURE A foundry sand composition that is self-hardening after a working life of about 10 - 20 minutes that is composed of a foundry sand, a sodium silicate binder and a specifically defined polyester polycarbonate hardener is prepared by: a) mixing a foundry sand with about 2 - 6 wt.%, based on the foundry sand, of an aqueous solution containing about 40 - 60 wt.% of sodium silicate, the ratio of SiO2/Na2O of the sodium silicate about 2.2 to 3, to form an initial sand mixture, and b) then adding about 5 - 15 wt.% of the poly- ester polycarbonate hardener, based on the weight of the aqueous solution of sodium silicate, to provide the foundry sand composition.

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