Catalysts and binder systems for manufacturing sand shapes

Details Catalysts and binder systems for manufacturing sand shapes Catalysts and binder systems for manufacturing sand shapes

1980-03-24

1982-03-02

Jacobs, Lewis T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524593, 524594, C08L 6106

Patent

active

043177638

ABSTRACT:
A catalyst material particularly useful in making core sand from which resin bound sand shapes are made. The preferred catalyst is a material comprising at least one salt made from a weak base and an acid from the group comprising lower aliphatic and aromatic sulfonic acids. The curable resin binder is preferably a furfuryl alcohol polymer or other furan-based material. The resin is preferably present in an amount of about 0.5% to about 5% based on the weight of sand, while the catalyst is present in an amount of about 5% to 40% by weight of the resin material. The catalyzed composition provides an excellent combination of working or bench life, rapid curing on a delayed action basis and favorable shape-imparting and holding properties in the formed sand shapes. Specifically preferred compositions include aluminum and copper phenol and toluene sulfonic acid salts.

REFERENCES:
patent: 3734936 (1973-05-01), Brown et al.
patent: 3745139 (1973-07-01), Kachur et al.
patent: 3793286 (1974-02-01), Petersen et al.
patent: 4028271 (1977-06-01), Schaidle et al.
patent: 4119606 (1978-10-01), Teplyakov et al.
patent: 4143867 (1979-03-01), Hoppe et al.

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