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1. (WO1980001767) ALKALI METAL SILICATE BINDER COMPOSITIONS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001767    International Application No.:    PCT/GB1980/000026
Publication Date: 04.09.1980 International Filing Date: 19.02.1980
IPC:
B22C 1/16 (2006.01), B22C 1/20 (2006.01), B22C 1/26 (2006.01), C04B 28/26 (2006.01)
Applicants:
Inventors:
Priority Data:
7906874 27.02.1979 GB
Title (EN) ALKALI METAL SILICATE BINDER COMPOSITIONS
(FR) COMPOSITIONS LIANTES DE SILICATE DE METAL ALCALIN
Abstract: front page image
(EN)A binder composition in aqueous solution, suitable for use in the production of foundry sand moulds and cores is obtained by mixing (i) an alkali metal silicate (ii) a substantially water soluble carbohydrate selected from monosaccharides, disaccharides, polysaccharides and derivatives thereof and (iii) urea. The composition may also contain an oxyanion such as a borate which is capable of forming a water soluble complex with the carbohydrate. The preferred carbohydrate is a stabilised starch hydrolysate whose reducing power has been removed by a process such as hydrogenation. Moulds and cores bonded using the composition may be hardened by injection of carbon dioxide gas, or a chemical hardening agent for the alkali metal silicate may be added to the sand.
(FR)Une composition liante en solution aqueuse utilisable dans la production de moules et noyaux de sable de fonderie est obtenue en melangeant (i) un silicate de metal alcalin, (ii) un hydrate de carbone sensiblement soluble dans l'eau choisi parmi des monosaccharides, des disaccharides des polysaccharides et leurs derives, et (iii) de l'uree. La composition peut egalement contenir un oxyanion tel qu'un borate capable de former un complexe soluble dans l'eau avec l'hydrate de carbone. L'hydrate de carbone prefere est un hydrolisat d'amidon stabilise dont le pouvoir reduction a ete supprime par un procede tel que l'hydrogenation. Les moules et noyaux lies utilisant la composition peuvent etre durcis par injection de gaz carbonique, ou un agent chimique de durcissement pour le silicate de metal alcalin peut etre ajoute au sable.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)