Binders for foundry cores and moulds

Details Binders for foundry cores and moulds Binders for foundry cores and moulds

1985-03-29

1986-05-13

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

164528, 164349, 164369, 106 3835, B22C 116, B22C 912

Patent

active

045880131

ABSTRACT:
A binder for a foundry core or mould consists of an alkali metal salt of a polybasic organic acid or of a polymerized monobasic organic acid, for example sodium polyacrylate, an alkaline earth metal hydroxide such as calcium hydroxide, one or more polyvalent metal oxides, preferably magnesium oxide, and calcium citrate, together with water. The mixture may also include another polyvalent metal oxide, for example zinc oxide. The inclusion of calcium citrate in the binder composition, particularly in the presence of magnesium oxide, has been found to reduce the problem of `softening back` in which the strength of the core or mould interior deteriorates over storage periods of a few days due to the continued absorption of carbon dioxide from the atmosphere in damp conditions.

REFERENCES:
patent: 4495980 (1985-01-01), Morley

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