A kind of preparation method of nano-scale organic bentonite

Abstract

The invention discloses a preparation method of nanoscale organobentonite, which comprises the following six steps: (1) bentonite raw ore processing, (2) sodium modification, (3) centrifugation purification, (4) inorganic acid modification, (5) organic coating reaction, and (6) a post treatment stage. The preparation method has the characteristics that through substep purification, a mass ratio of a sodium agent to suspending liquid is kept at 0.3%; in an inorganic acid modification process, improvements are performed by adjustment of a PH value to subacid and a charging mode in the organic coating reaction stage; the bentonite is subjected to delaminating dispersion, centrifugation purification and superfine grading to prepare pure montmorillonite with the content greater than 95%; then, double octadecyl dimethyl ammonium chloride is used for performing the organic coating reaction; finally crushing to a nanoscale particle size is performed, that is, the average lamellar thickness is less than 25 nanometers; and the preparation method ensures the product quality, shortens the production cycle greatly, lowers the production cost, and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the field of production and manufacture of organic bentonite, in particular to a preparation method of nanoscale organic bentonite. Background technique [0002] Bentonite refers to a kind of clay rock mainly composed of montmorillonite. According to the main exchange cation types of montmorillonite contained in it, bentonite can be divided into sodium base (alkaline soil), calcium base (alkaline earth type soil), magnesium Based, lithium-based and hydrogen-based bentonite (activated clay) and artificially modified organic bentonite. my country is rich in bentonite resources, and there are various types of bentonite, but so far the national mining and utilization is still very low, and the expensive high-tech bentonite is still mainly imported. [0003] Organo-bentonite is an inorganic mineral / organic ammonium compound, using bentonite as raw material, using the lamellar structure of montmorillonite in bentonite and its abilit...

AI Technical Summary

Problems solved by technology

Although the organic bentonite prepared by the above invention has a finer dispersed particle size in the organic system, it is suitable for both low and medium polarity solvents, and is also suitable for medium and high polarity systems, but there are still differences between this preparation process and the preparation process of nano-organic bentonite , and, our company has learned through a large number of experiments that the three major factors affecting the quality of nano-organic bentonite are raw ore quality, purification and organic coverage; in addition, it is not ideal to prepare nano-scale organobentonite with pure sodium-based bentonite, only sodium ions and calcium Only when the ions reach a certain ratio, that is, a small amount of sodium ions are replaced by calcium ions, can the maximum expansion multiple and the fastest hydration rate be achieved