Acid catalysis of resin foundry binders

Details Acid catalysis of resin foundry binders Acid catalysis of resin foundry binders

1980-01-31

1981-09-01

Garvin, Patrick

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252428, 260 38, B01J 3102

Patent

active

042870925

ABSTRACT:
A method of producing sand cores or molds for foundry use involves coating the sand with a novel acid catalyst composition and adding acid-curing, condensation-type resin.
A novel acid catalyst composition comprises the mixture of a sulfonic acid such as benzene sulfonic acid, toluene sulfonic acid or xylene sulfonic acid, or mixtures thereof, with 0.5-20% wt. perchloric acid. A catalyst of this composition, when admixed with foundry sand and an acid-curing condensation-type resin, is a novel composition characterized by rapid cure and high tensile strength and hardness in the resulting resin-bound sand core or mold. Sand cores or molds made using this catalyst/sand/resin composition are further characterized by low emissions of oxidizable gaseous organic constituents.

REFERENCES:
patent: 3700604 (1972-10-01), Metil
patent: 3976595 (1976-08-01), Scott et al.
patent: 4028271 (1977-06-01), Schaidle et al.

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