Method of preparation of crystalline layered structure alcali metal silicates

摘要

A process for the production of a crystalline alkali layer silicate in an aqueous medium is described, in which an acid compound is added to a solution of water or an amorphous alkali silicate with a molar ratio M2O / SiO2 (M = alkali metal) of 0.24 to 2.0 that a molar ratio M2O (not neutralized) / SiO2 of 0.05 to 0.239 is achieved. If appropriate, a molar SiO2 / H2O ratio of 1: 5 to 1: 100 is set by dilution and the reaction mixture is kept at a reaction temperature of 70 to 250 ° C. until the alkali layer silicate has crystallized out.