纳米膨润土复合体的制备及性能

Preparation and Properties of Nanometer Bentonite Composite.

介绍了膨润土利于插层的结构特征。膨润土纳米改性的机理是插层剂阳离子与膨润土层间阳离子的离子交换作用,离子交换的动力学过程主要由插层剂溶液向层间扩散的速度控制,纳米土的改性效果与插层剂的种类、用量及阳离子的交换条件如交换温度和时间等密切相关。选择有机阳离子盐作为插层剂对钠型膨润土进行直接插层改性,制得了纳米膨润土,探讨了纳米复合体在钻井液中的应用,分别测试了纳米复合体的降滤失及增粘性能。结果表明,纳米膨润土在降滤失、增粘等方面已显示出优异性能,且其在钻井液体系中具有良好的配伍性能。

This paper describes the study on preparation and properties of nanometer bentonite composite.Since the specific layered structure of bentonite,layer-insertion method can be applied for preparation of nanometer bentonite composite.The mechanism of the preparation is based on the cation exchange between the bentonite and layer-inserting agent that take part in the reaction.The dynamics of the cation exchange reaction depends on how is adjusted the diffusion speed of the layer-inserting agent into the bentonite layers.The effect of the modification of the bentonite processed is tightly related to the type,dosage applied of the layer-inserting agent and the reaction conditions such as temperature and time.A nanometer bentonite composite was prepared by using salts of cationic polymers as layer-inserting agent and sodium bentonite.A series of tests were conducted on FL controlling and viscosifying effect and the chemical compatibility of the nanometer bentonite composite prepared and very satisfied achievements were obtained.