| 摘要 |
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. |
