Heat cured foundry binders and their use

Details Heat cured foundry binders and their use Heat cured foundry binders and their use

1993-10-27

1995-05-23

Group, Karl

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 389, B28B 734

Patent

active

054177510

ABSTRACT:
This invention relates to heat-cured foundry binders comprising in admixture (1) a source of soluble silica, and (2) a source of soluble alumina, such that the source of silica, source of alumina, or both contain an alkali metal. The binder components form a saturated solution when they are mixed with an aggregate. The resulting mix is shaped and heated at an elevated temperature to form a cured foundry shape. Heat is applied by warm air with warm-box equipment, baking in an oven, microwave, and preferably from hot-box equipment.

REFERENCES:
patent: 4357165 (1982-11-01), Helferich et al.
patent: 4432798 (1984-02-01), Helferich et al.
patent: 4533393 (1985-08-01), Neuschaeffer et al.
Dehydration-Rehydration and Other Related Property Changes of Alumino-Silicate Gels, N. K. Mitra, S. Ghatak, R. Ghosh Dastidar and S. Gupta, Dept. of Chem. Technology, University of Science & Technology, 92 Acharyya Profulla Chandra Road, Calcutta-700 009, vol. 43(1), Jan.-Feb. 1984, pp. 11-14.
Reclamation of a New Inorganic, No-Bake Binder, G. J. Bolton, The Duriron Co., Dayton, Ohio, AFS Transactions, vol. 91, 1983, pp. 95-100.
An Introduction to the SAH Binder System, G. J. Bolton, Duriron Co., Inc., R. S. Doles, Nalco Chem. Co., F. M. McNally, Nalco Chem. Co., and D. A. Shackelford, Nalco Chem. Co., AFS Transactions, vol. 91, 1983, pp. 675-680.

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