COMPOSITION OF FOUNDRY SAND PARTICLE BINDER, PROCESS FOR PREPARING RESIN-COATED SAND AND SAND OBTAINED FOR FORMING SAND-MOLDING MOLDS AND CORES

摘要

The present invention relates to a composition of a resinous sand particle binder. According to the invention, the composition contains a crystalline and unsaturated polyester as a main component and a phthalate monoxide. DIALLYL, THE PONDERAL RATIO OF DIALYL PHTHALATE WITH THE UNSATURATED POLYESTER BEING FROM 5: 100 TO 30: 100, THE COMPOSITION BEING A SLEEPING SOLID AT AMBIENT TEMPERATURE, ITS VISCOSITY AT A TEMPERATURE OF THE ORDER OF 30C ABOVE ITS AMOLINATION POINT LESS THAN ABOUT 500 POISES; THE JOINT DRAWING SHOWS THE RELATIONSHIP BETWEEN THE QUANTITY DEPHTALATE OF DIALLYL AND THE DURATION OF THE MIXTURE FOR PREPARING A RESIN-COATED SAND ACCORDING TO THE INVENTION. The invention applies in particular to the formation of molds and corals. TO BE USED IN MOLDING OR SAND CASTING PROCESSES. / P