聚胺抑制剂 PF-UHIB与膨润土相互作用机理

Interaction Mechanism between Polyamine Inhibitor PF-UHIB and Bentonite

张兴来 罗健生 郭 磊 李怀科 张 磊

ZHANG Xinglai LUO Jiansheng GUO Lei LI Huaike ZHANG Lei

为揭示聚胺抑制剂 PF-UHIB与膨润土的作用机理， 通过红外光谱、 XRD、 SEM和 Zeta电位分析， 考察了聚胺 PF-UHIB与夏子街钠膨润土的相互作用， 利用 Material Studio软件对其相互作用进行了分子动力学模拟。结果表明， PF-UHIB离解出有机胺阳离子， 通过静电作用吸附在带负电的黏土层间或者表面， 将层间水分子排挤出来， 分子的疏水基团阻止水分子接触黏土； PF-UHIB与黏土晶面上的硅氧烷基形成有序氢键， 阻止聚胺分子继续进入黏土层间， 有效地抑制黏土水化膨胀； 黏土对 PF-UHIB的吸附存在平衡状态， 吸附平衡时黏土的 Zeta电位约-20 mV， 有效抑制黏土分散。通过扫描电镜照片直观地观测到加入 PF-UHIB后， 黏土颗粒结合更紧密， 分散度明显降低。图 9表 1参 12

In order to reveal the interaction mechanism between polyamine inhibitor PF-UHIB and bentonite，the interaction between polyamine PF-UHIB and sodium bentonite（Na-MMT）was investigated by FTIR，XRD，SEM and Zeta potential analysis. Molecular dynamics simulation of this interaction was developed by Material Studio software. The results showed that PF-UHIB could dissociated ammonium ions，which adsorbed on the interlays and surface of clay through electrostatic interaction and pushed out hydrone from clay interlays. The hydrophobic group of PF-UHIB prevented the contaction between hydrone and clay. Meanwhile，hydrogen bonds formed between polyamine molecules and siloxane groups in tetrahedral layers of the clay，which prevent PF-UHIB from entering into clay sheet. In this way，the hydration and swelling of the clay were inhibited effectively.The adsorption of PF-UHIB on the clay had an adsorption equilibrium state with Zeta potential of the clay was about -20 mV，and the dispersion of clay was inhibited availably. The SEM photos displayed that the bond of clay particles was tighter，and the dispersion degree of clay reduced obviously.

10.19346/j.cnki.1000-4092.2016.06.002