Self-hardening mold sand

Details Self-hardening mold sand Self-hardening mold sand

1978-12-27

1980-10-14

Hayes, Lorenzo R.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 383, 106 90, 106 98, 106104, 106109, B28B 734

Patent

active

042279313

ABSTRACT:
The specification discloses a self-hardening mold sand having surface stability and high compressive strength yet containing a comparatively small amount of water. The mold sand is prepared by mixing a self-hardening binder of clinker powder, containing 11CaO.7Al.sub.2 O.sub.3. CaX.sub.2 (where X is a halogen atom) and a sulphate, with a binder additive consisting of a surface active agent of which the main component is .beta.-naphthalene-sulphonic acid formaldehyde condensate salt, and then mixing this binder and binder additive with sand, water and preferably a retarder consisting of an organic carboxylic acid or boric acid.

REFERENCES:
patent: 2081558 (1937-05-01), Prange
patent: 3600203 (1971-08-01), Aldera
patent: 3788868 (1974-01-01), Kitsuda et al.
patent: 3864141 (1975-02-01), Uchikawa et al.
patent: 3874885 (1975-04-01), Lyass et al.
patent: 4080213 (1978-03-01), Mori et al.
patent: 4113499 (1978-09-01), Ivanov et al.
patent: 4131474 (1978-12-01), Uchikawa et al.

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