Sodium bentonite clay binder mixture for the metal casting indus

Details Sodium bentonite clay binder mixture for the metal casting indus Sodium bentonite clay binder mixture for the metal casting indus

1989-04-11

1994-01-04

Group, Karl

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 3835, 106 389, 164138, B28B 734

Patent

active

052751147

ABSTRACT:
A foundry sand binder composition and method of manufacturing cast metal objects by casting molten metal into a mold cavity formed of sand held in a predetermined mold configuration by a binder comprising a plurality of sodium bentonite clays. A blend of two or more sodium bentonite clays obtained from different areas as a foundry sand binder synergistically and unexpectedly improves the foundry sand used as a mold cavity for casting metal objects by unexpectedly improving one or more of the following foundry sand properties beyond the level of either of the blended sodium bentonites alone: green compressive strength; hot compressive strength; dry compressive strength; wet tensile strength; flowability; surface finish; activation speed and shakeout.

REFERENCES:
patent: 3431123 (1969-03-01), Zrimsek et al.
patent: 3445251 (1969-05-01), Nevins
patent: 4137085 (1979-01-01), Matsui
patent: 4203771 (1980-05-01), Matsui
patent: 4505750 (1985-03-01), Lowan
patent: 4636262 (1987-01-01), Reed

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