Preparation of coated casting sand using unsaturated polyester r

Details Preparation of coated casting sand using unsaturated polyester r Preparation of coated casting sand using unsaturated polyester r

1978-12-07

1981-01-20

Jacobs, Lewis T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C08L 6706

Patent

active

042461650

ABSTRACT:
A crystalline unsaturated polyester, which is a scarcely tacky solid at room temperature but at a temperature somewhat above its softening temperature assumes a fluid state with a viscosity below about 500 poises, is used as a principal component of a binder for the preparation of a resin coated casting sand for use in shell mold casting of, particularly, aluminum alloys with an aim of facilitating the disintegration of molds and cores. The binder is mixed with a conventional foundry sand at an appropriately elevated temperature in the presence of an organic peroxide as a polymerization catalyst. The binder may preferably contain a cross-linking agent such as diallyl phthalate and optionally a silane as a coupling agent and/or a cross-linking accelerator.

REFERENCES:
patent: 1831555 (1931-11-01), Earl
patent: 2830342 (1958-04-01), Meyers et al.
patent: 3962162 (1976-06-01), Schmonk

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