PROCESS FOR PRODUCING HIGH SOLIDS COLLOIDAL SILICA

摘要

The invention provides a method for improving the effectiveness of colloidal silica. The method involves removing enough charged impurities from the colloid to prevent the charged particles from causing the colloid to become a viscous gel. The method however also involves not removing too many charged particles so the silica material doesn't gel by cross-linking with itself. This method is quite effective because it recognizes that materials that have accumulated during the formation of the colloid do perform an important function, but they can perform better at a lower concentration.

主权项

1. A method for improving the performance of colloidal silica, the method comprising the steps of:
providing a colloidal silica, and separating impurity particles from the colloidal silica wherein the separation is conducted to a degree such that cross-linkage inducing interactions between impurity particles and silanol groups on dispersed-phase particles decreases but not to such a degree that cross-linkage inducing interactions between silanol groups increases, the separation increasing the particle size of the dispersed-phase particles of the colloid by at least 5% without impairing the S-Value, or stability of the colloid.