Method for increasing the mechanical resistance of foundry mould

Details Method for increasing the mechanical resistance of foundry mould Method for increasing the mechanical resistance of foundry mould

1974-08-12

1976-11-23

Hayes, Lorenzo B.

Metal founding

Process

Shaping a forming surface

260 39SB, 260 294R, 260DIG40, 264219, C08L 6120, B22C 122

Patent

active

039931170

ABSTRACT:
Foundry moulds and cores of increased mechanical resistance are prepared from sand, a binding agent, a setting agent, and a surface active agent, the binding agent being a urea-formaldehyde resin or a urea-formaldehyde-furfuryl alcohol resin, the surface active agent being capable of producing a foam which begins to subside before the sand begins to set, the surface-active agent being selected from the group consisting of an alkylbenzene sulphonate, an alkylamine salt of formula RNH.sub.2,YH in which R is an alkyl group of more than 9 carbon atoms and Y is the anionic portion of an acid or a compound of formula: ##EQU1## IN WHICH R represents an alkyl group having more than 9 carbon atoms and Me is an alkali metal; in the proportion of 0.01 to 2% by weight of surface-active agent with respect to the total weight of the liquid sand. Particularly effective are n-dodecylbenzene sulphonate and tetra-isobutyl sulphonate.

REFERENCES:
patent: 2993016 (1961-07-01), Sucetti
patent: 3360492 (1967-12-01), Tsou
patent: 3424600 (1969-01-01), Liass et al.
patent: 3615755 (1971-10-01), Uto et al.
patent: 3644274 (1972-02-01), Maurukas
patent: 3725090 (1973-04-01), Lyass et al.

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