关键词: 膨润土, 有机改性, 正交实验, 表征

Abstract: The organic bentonites were prepared with the low-level Ca-bentonites obtained from Jianping, Liaoning province. By means of orthogonal experiment, the optimal conditions of organic bentonites preparation are 20 g natural bentonite, 6.25 g CTMAB, 150 mL water, stirring time 3 hours, and standing time 2 days. XRD shows d(001) value of modified bentonite has increased from 1.5286 nm to 2.1567 nm, TG-DTA, and FT-IR prove organic modifiers have entered into the interlayers of the bentonites. A hydrophobic and lipophilic analysis of the modified bentonites was made. By one time modified technics, the traditional technics of organoclay preparation only by cation exchange reaction of Na-montorillonite with quaternary ammonium salt organic cation (HDTMA) are innovated and the cost of the organoclay preparation is greatly reduced.

Key words: bentonite, organic modification, orthogonal technique, property characteration