Foundry moulds and cores

Details Foundry moulds and cores Foundry moulds and cores

1982-11-09

1984-08-28

Jacobs, Lewis T.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

523145, C08K 336, C08K 334

Patent

active

044683596

ABSTRACT:
A foundry moulding composition comprising (a) a granular refractory material, and (b) from 0.5% to 8% based on the weight of the refractory material of a binder comprising (i) an aqueous solution of a potassium alkali phenol-formaldehyde resin, said aqueous solution having a solids content of from 50% to 75% and said resin having a weight average molecular weight (M.sub.w) of from 600 to 1500, a formaldehyde:phenol molar ratio of from 1.2:1 to 2.6:1 and a potassium hydroxide:phenol molar ratio of from 0.2:1 to 1.2:1 and (ii) at least one silane in an amount of from 0.05% to 3% based on the weight of said aqueous solution, said binder being curable by contact therewith of from 5% to 60% based on the weight of said aqueous solution of a C.sub.1-3 alkyl formate.

REFERENCES:
patent: 3234159 (1966-02-01), Cooper
patent: 3599433 (1971-08-01), Murata et al.
patent: 3696622 (1972-10-01), Tohma et al.
patent: 3720642 (1973-03-01), Junger et al.
Chem. Abst. 84, 125183c, (1976).

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