Preparation and experiments for a novel kind of foundry core binder made from modified potato starch

In order to be used as an alternative binder of sand core in foundry, a liquid water-soluble modified starch binder (WMSB) was developed. Laboratory testing results showed that the dry strength of WMSB core sand could reach 2.0 MPa and be controlled by the additions of WMSB and bentonite. Moisture absorption character, gas forming property and breakdown capacity of WMSB core sand were proved to be acceptable by comparison tests with some common core binders. Batch production experiments of WMSB were conducted to make sand cores of various castings and testified that the utilization of WMSB was feasible and valuable in foundry application.