Moulding or core sand bonded by biodegradable polymeric binder

摘要

Moulding or core sand bonded by a biodegradable polymeric binder made of one hundred parts by weight of refractory matrix as well as of one up to five parts by weight of organic binder is characterized by the binder containing a mixture of aqueous solution of synthetic polymer in the quantity of 30 - 70% by weight and natural polymer in the quantity of 30-70% by weight. The applied synthetic polymer is poly(acrylic acid) or poly(sodium acrylate). The natural polymer effectively applied is a biopolymer of polysaccharide group in the form of modified starch or dextrin.