Preparation and Characterization of Organobentonite with HTMAC and STAC

Purification of bentonite from RiYueLeimine of Xiazijie in Xinjiang,was modified to Nabentonite by NaNO3,and then to synthesize organobentonite using two quaternary ammonium salts.The factors for viscosity of organobentonite were investgated.The structures and properties of organobentonite were characterized by X-ray diffraction and scanning electron microscope.The results showed that the optimum conditions were that the concentration of NaNO3 was 2%,hexadecyltrimethylammonium chloride and octadecyltrimethylammonium chloride were 1.6mmol/g and 1.4mmol/g,serous pH 9,reaction temperature 60℃,and reaction time 1.5h,drying time 14 h,respectively.Under the above conditions the process was more reasonable and the quality of organobentonite was more excellent.Two organobentonites' d(001)have increased from 1.387 2nm to 1.961 7and 2.423 8nm,indicating that the organic quaternary ammonium cation had intercalated into the layers of montmorillonite.