Effects of binder components and PVA modifier on bonding performance of phosphate binder for sand core-making

A type of heat-curing phosphate binder was proposed, and orthogonal experiments based on the tensile strength sand samples determined that optimal composition phosphoric acid: water: aluminum hydroxide: magnesium oxide: boric acid = 300: 70: 60: 9: 8. Adding 10% polyvinyl alcohol (PVA) solution during mixture process can significantly improve 24 h samples. When adding 30 g 8 PVA solution, initial sample is 0.76 MPa, room temperature 2.29 1.73 MPa. The modified mold has high low gas generation, which meet general casting production requirements.