Furan-phenolic resins for collapsible foundry molds

Details Furan-phenolic resins for collapsible foundry molds Furan-phenolic resins for collapsible foundry molds

1977-07-12

1979-01-16

Husar, Francis S.

Metal founding

Process

Shaping a forming surface

164 21, B22C 122

Patent

active

041344421

ABSTRACT:
A resin for coating sand and a resin-coated sand produced therefrom wherein the resin is prepared by incorporating furan into a phenolic novolak resin. In the preferred practice, the resin is produced by reaction of furfuryl alcohol with a phenolic compound at an acid pH to give a furfuryl-phenolic intermediate in a first step, and then, in a second step, reacting the furfuryl-phenolic intermediate with a lower aliphatic aldehyde to produce the resin. The resin-coated sands of the present invention provide unexpectedly improved shakeout and collapsibility characteristics in the shell process.

REFERENCES:
patent: 2453704 (1948-11-01), Dunlop et al.
patent: 2566851 (1951-09-01), Novotny et al.
patent: 2745816 (1956-05-01), Dijkstran
patent: 3299167 (1967-01-01), Knowlson et al.
patent: 3312650 (1967-04-01), Case et al.

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