重晶石粉末表面偶联剂改性和表征

Abstract

利用自制的钛酸酯偶联剂，采用干法改性工艺，对天然重晶石表面进行改性研究，测试了改性前后重晶石吸油量、接触角、活化指数等性能指标，通过对比发现改性后重晶石表面性能有了明显改变，达到了从亲水性向疏水性的转变。粒径分布结果表明改性后颗粒未发生明显团聚现象，而通过扫描电子显微镜、热重和傅里叶变换红外光谱分析表征，观察到颗粒形貌，失重率及表面状态的变化，验证了其改性后偶联剂与重晶石的表面键合作用，并由此为基础探讨了其改性机理。 Natural barite powder was modified with the method of surface coating by self-made titanate coupling agent. The effect of modification was evaluated by the oil absorption value, contact angle, activation index, and particle size distribution. By comparison, there is significant change on the surface performance of barite after modification, from hydrophility to hydrophobicity. No obvious aggregation of particles was found by the result of particle size distribution. Through the characterization of FTIR, SEM, and thermal analysis, the change of morphology, weight loss ratio, and surface state were observed. These results verified the chemical bonding between the titanate coupling agent and the surface of barite after modification. Based on the results, the modification mechanism was discussed.