Rapid setting foundry sand compsn - by in situ generation of glycerol from sodium silicate-polyester reaction

摘要

Rapid cold setting of foundry sand contg. a liquid Nasilicate binder is effected by reacting the binder with a polyester which generates glycerol by saponification, in the presence of an initiator. This eliminates drawback associated with gaseous hardeneres and allows the rise of smaller amts. of binder. The setting time can be controlled and setting taking place without expansion or excessive hardness.