【摘要】 探究羟丙基甲基纤维素、聚丙烯酰胺两种辅料浓度及加入量对自硬砂性能的影响，讨论了两种辅料联合加入的影响，借助SEM-EDS和FTIR对影响机理进行了初步分析。结果表明，占粘结剂2%的0.7%羟丙基甲基纤维素水溶液和占粘结剂1%的0.8%聚丙烯酰胺水溶液联合加入能有效提高自硬砂干强度和抗吸湿性。相对湿度为40%～60%RH时，干强度由0.67 MPa提高到0.97 MPa，存放4天期间，平均强度提高24.58%；恒湿箱80%～85%RH时，砂样存放4天的平均强度提高43.27%,24～96 h内强度下降率由31.25%下降到25.00%。更多还原

【Abstract】 The effects of concentration and addition amount of hypromellose and polyacrylamide on the properties of no-bake sand were investigated, and the effect of the combined addition of the two accessories was discussed.The influence mechanism was preliminarily analyzed by SEM-ED Sand FTIR. The results show that the combined addition of 0.7%wt hypromellose aqueous solution accounted for 2% of the binder and 0.8%wt polyacrylamide aqueous solution accounted for 1% of the binder can effectively improve the dry strength and moisture resistance of no-bake sand. When the relative humidity is 40%-60%RH, the dry strength of the sand sample increases from 0.67 MPa to 0.97 MPa after hardening, and the average strength increases by 24.58% during 4 days of storage. When stored in the constant humidity box with 80%-85%RH for 4 days, the average strength increases by 43.27%, and the strength reduction rate decreased from 31.25% to 25.00% within 24-96 h.更多还原