ARGILLA ORGANOFILA E PROCEDIMENTO PER LA SUA PREPARAZIONE.

摘要

A process for producing an organophilic clay comprises: (a) milling and refining a raw clay selected from the group of smectite clays in order to obtain a milled and refined clay; (b) replacing the exchangeable cations of the refined clay with sodium or ammonium cations, by means of a cation-exchange treatment; (c) contacting the cation-exchanged clay with a sulfonated condensed-ring polycyclic aromatic compound in order to obtain an organophilic clay; and (d) recovering the organophilic clay from the products obtained from the preceding (c) step. The so obtained organophilic clay is particularly useful as a thixotropic agent in organic vehicles, in particular in oil-base drilling muds.