复合改性剂对CO_2硬化水玻璃砂性能的影响

Effect of Compound Modifier on Properties of CO_2 Hardened Sodium Silicate Bonded Sand

用无机物粉末(Al_2O_3、ZrO_2和Si_3N_4)和有机酯(十六烷酸甲酯、硬脂酸甲酯和邻苯二甲酸二辛酯)对水玻璃进行改性,测定改性后CO_2水玻璃砂试样的即时强度、24 h强度和残留强度,通过XRD和SEM分析了改性剂对水玻璃砂性能的影响机理。结果表明,无机物改性剂的最佳加入量为1.5%,有机物改性剂的优化配比为十六烷酸甲酯6%、硬脂酸甲酯2%、邻苯二甲酸二辛酯4%。无机物粉末和有机酯的加入都在一定程度上提高了水玻璃砂的常温强度并改善了其溃散性。

Sodium silicate was modified by inorganic powder(Al2O3, ZrO2 and Si3N4) and organic ester(methyl palmitate, methyl stearate and dioctyl phthalate), the instant strength, 24 h strength and residual strength of the modified CO2 sodium silicate sand samples were measured, the influence mechanism of modifier on the properties of sodium silicate sand was analyzed by XRD and SEM. The results showed that the best addition amount of inorganic modifier is 1.5%, the optimum ratio of organic modifiers is methyl palmitate 6%, methyl stearate 2%, dioctyl phthalate 4%. The addition of inorganic powder and organic ester increases the strength of sodium silicate sand to a certain extent and improves its collapsibility.