Title: Self-hardening mold sand

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.

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Inventors: Uchikawa, Hiroshi (Funabashi, JP)
Kato, Hajime (Yokohama, JP)

Application Number: 973611
Filing Date: 1978-12-27
Publication_date: 1980-10-14
Assignee: Onoda Cement Co., Ltd. (Onoda, JP)
Primary Class(es): 106/38.35 106/38.3, 106/717, 106/726, 106/728, 106/815
Other Classes:
US Patent Ref:

2081558	May, 1937	Prange	106/38.
3600203	Aug, 1971	Aldera	106/38.
3788868	Jan, 1974	Kitsuda et al.	106/90.
3864141	Feb, 1975	Uchikawa et al.	106/90.
3874885	Apr, 1975	Lyass et al.	106/38.
4080213	Mar, 1978	Mori et al.	106/38.
4113499	Sep, 1978	Ivanov et al.	106/38.
4131474	Dec, 1978	Uchikawa et al.	106/38.

Other Refs:
Primary Examiner: Hayes, Lorenzo R.
Assistant Examiner:
Attorney: Price, Heneveld, Huizenga & Cooper