BINDER FOR AIR-SOLIDABLE MOLDING SAND, PROCESS FOR PREPARING SAID BINDER AND AIR-SOLIDABLE MOLDING SAND CONTAINING SAID BINDER

摘要

P THE INVENTION CONCERNS FOUNDRY. /P P THE BINDER FOR MOLDING SAND CONFORMING TO THE INVENTION IS OF THE UREE-FORMOL RESIN TYPE, WITH A BINDING POWER REGULATOR MODIFIER, AND IS CHARACTERIZED AS A MODIFIER, AN EMULSION CONTAINING A HEAVY FRACTION OF OIL SHALE TAR WITH A VOLUME AT LEAST 1.01GCM IS USED, AN ORGANIC SOLVENT CAPABLE OF DISSOLVING THE CARBON COMPOUNDS CONTAINED IN THE SAME. AN EMULSIFIER AND WATER, THE CONSTITUENTS BEING INTRODUCED IN PROPORTIONS FOR OBTAINING A HOMOGENEOUS EMULSION OF THE FIRST KIND, OF THE "OIL IN WATER" TYPE. /P P THE INVENTION IN PARTICULAR CONFER BINDING A HIGH HEAT RESISTANCE AND A HIGH MECHANICAL RESISTANCE WITHOUT CAUSING A SENSITIVE INCREASE IN ITS COST PRICE. /P