Shell-molding resin coated sand

Details Shell-molding resin coated sand Shell-molding resin coated sand

1983-03-28

1984-07-10

Jacobs, Lewis T.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523147, 524372, C08K 506

Patent

active

044593775

ABSTRACT:
An improved resin coated sand for use in foundry shell-molding applications is disclosed which has increased resistance to thermal shock at the time of pouring. The improved product uses a phenolic resin as binder with aromatic compounds selected from the following generic formulae: ##STR1## wherein m, n, x and y are integers. The foundry aggregates are mixed with the phenolic resin and organic compounds under conventional mixing conditions to form a sand-resin mixture that can be formed into shell-molds. Upon casting the molten metal into these molds, the abrupt thermal expansion of the coated sand is controlled to eliminate the cracking that occurs when conventional phenolic-sand mixtures are employed.

REFERENCES:
patent: 3917558 (1975-11-01), Gardikes et al.
patent: 4252700 (1981-02-01), Funabiki et al.
patent: 4290928 (1981-09-01), Funabiki et al.
patent: 4336179 (1982-06-01), Iyer
patent: 4379866 (1983-04-01), Henry et al.

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