Mold binder material

Details Mold binder material Mold binder material

1978-09-26

1981-07-14

Jacobs, Lewis T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296H, 260 4251, 260 4252, C08L 2308

Patent

active

042785812

ABSTRACT:
In a mold to be hardened by a CO.sub.2 gas, a mold binder material comprising a combination of polymers containing carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and resins of polyvinyl alcohol group, and at least one of sodium salt of gluconic acid and polyhydric alcohols or a mold binder material comprising a combination of polymers having carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and at least one of sodium salt of gluconic acid and polyhydric alcohols is provided. By use of the present binder material, the following various effects can be obtained: (1) easy preparation of mold sand, (2) easy removal of the binder material by water washing even if bodies or clothes are fouled by the binder material, (3) a longer working time of mold sands, (4) a higher mold strength, (5) an improved working atmosphere at shaping of the mold, (6) an improved production efficiency of molds, (7) the desired mold strength being obtained with a smaller amount of CO.sub.2 gas used, etc.

REFERENCES:
patent: 2765507 (1956-10-01), Wolf et al.
patent: 3645937 (1972-02-01), Lang et al.
patent: 3960798 (1976-06-01), Nakazawa et al.
Condensed Chemical Dictionary; 7th Ed.; 1966; p. 864.

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