Shell-molding resin coated sand

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

C - Chemistry, Metallurgy

08

K

117/48

C08K 5/06 (2006.01) B22C 1/02 (2006.01) B22C 1/22 (2006.01) C08G 8/36 (2006.01)

Patent

CA 1203439

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: and/or, Image wherein m, n, x and y are integers. The foundry aggregates are mixed with the phenolic resin and organic compounds under conven- tional 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.

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