Coating compositions

B - Operations – Transporting – 22 – C

Patent

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B22C 3/00 (2006.01) B22C 1/02 (2006.01) C09D 5/02 (2006.01)

Patent

CA 2338197

A coating composition for use on sand cores and moulds in foundries is disclosed. The coating composition comprises particulate refractory material having a particle size of predominantly less than 150 microns, a binder, water and a water soluble or water miscible additive selected from esters of polyhydric alcohols, carbonate esters and lactones. Also disclosed is a coating system comprising two or more separate parts to be mixed together to form a coating composition, the coating system comprising: (a) particulate refractory material having a particle size of predominantly less than 150 microns, and a binder; and, separately, (b) a water soluble or water miscible additive selected from esters of polyhydric alcohols, carbonate esters and lactones. The water soluble or water miscible additive may comprise one or more of: diacetin, triacetin, butylene glycol diacetate, propylene carbonate, gamma-butyrolactone, for example.

La présente invention concerne une composition d'enduit s'utilisant en fonderie, sur les noyaux en sable et les moules. Cette composition d'enduit est constituée d'un matériau particulaire réfractaire d'un calibre particulaire généralement inférieur à 150 µm, d'un liant, d'eau et d'un additif hydrosoluble ou hydromiscible appartenant au groupe des esters d'alcools polyhydriques, esters de carbonates et lactones. La présente invention concerne un système d'enduit comprenant au moins deux parties séparées à mélanger l'une à l'autre pour former une composition d'enduit. Ce système d'enduit comprend: (a) un matériau particulaire réfractaire d'un calibre particulaire généralement inférieur à 150 $(m)m et un liant, et, pris séparément, (b) un additif hydrosoluble ou hydromiscible appartenant au groupe des esters d'alcools polyhydriques, esters de carbonates et lactones. Cet additif hydrosoluble ou hydromiscible peut comprendre au moins de la diacétine, de la triacétine, du butylène-glycol-diacétate, du carbonate de propylène, du .gamma.-butyrolactone.

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