Resin coated sand for shell molding process

Details Resin coated sand for shell molding process Resin coated sand for shell molding process

1983-01-05

1984-06-05

Jacobs, Lewis T.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523145, C08K 505

Patent

active

044529279

ABSTRACT:
Resin coated sand for foundry shell molding operations is provided which eliminates the cracking of the molds at the time of pouring. In conventional phenolic bonded sand molds, the abrupt thermal expansion caused by the pouring of the molten metal into the mold causes the mold to crack. The resin coated sand, in this invention, is composed of foundry sand or aggregates coated with a phenolic resin which has incorporated therein, a polyethylene glycol of high molecular weight. This improved coated sand eliminates cracking at pouring and does not impair the shake-out property of the molds.

REFERENCES:
patent: 2662067 (1953-12-01), Less et al.
patent: 4196114 (1980-04-01), Funabiki et al.
patent: 4250076 (1981-02-01), Golden et al.
patent: 4252700 (1981-02-01), Funabiki et al.

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