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Process for producing high solids colloidal silica

A technology of colloidal silicon dioxide and colloid, which is applied in the direction of silicon dioxide, silicon oxide, chemical instruments and methods, etc., and can solve problems such as damage to the stability of particles

Active Publication Date: 2017-07-07
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, other factors can also compromise the stability of microparticles

Method used

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  • Process for producing high solids colloidal silica
  • Process for producing high solids colloidal silica
  • Process for producing high solids colloidal silica

Examples

Experimental program
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Effect test

Embodiment

[0053] The foregoing may be better understood with reference to the following examples, which are shown for purposes of illustration and not intended to limit the scope of the invention.

[0054]Various colloidal silica samples were produced according to the resin-based formation process. Various properties of the samples were measured. S-value, surface area, and % solids are proxies used to predict the effectiveness of a sample in industrial applications. Samples were derived from commercially available colloidal silica (POSITEK 8699, Nalco Corporation, Naperville, IL) and were modified according to one of the following processing schemes.

[0055] I) Unmodified

[0056] II) Add cationic resin to reduce conductivity

[0057] III) Apply ultrafiltration

[0058] IV) Di-filtration is applied.

[0059] Properties of these samples are listed below.

[0060] Table 1

[0061]

[0062] The stability of these colloids is as follows:

[0063] Table 2

[0064]

[0065] Th...

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Abstract

The present invention provides methods for improving the effectiveness of colloidal silicon dioxide. The method includes removing enough charged impurities from the colloid to prevent the charged particles from turning the colloid into a viscous gel. However the method also includes not removing so many charged particles that the silica material does not gel by cross-linking with itself. This approach is quite effective because it is recognized that aggregated materials do exhibit important functions during colloid formation, but that they may perform better at lower concentrations.

Description

[0001] Background of the invention [0002] The present invention relates to compositions of matter, methods and apparatus useful for producing stable high solids colloidal silica and uses thereof. Colloidal silica is an aqueous system in which silica particles are suspended, as described in US Patents 6,486,216, 6,361,653, 5,840,158, 6,361,652, 6,372,805 and US Published Patent Application 2011 / 0250341 Al. Colloidal silica has been found to be useful, depending on particle size, in a number of applications including the manufacture of silicon wafers and carbonless copy paper, as an anti-soilant, lubricant, high temperature adhesive, abrasive, moisture absorber and Antiwear agent. In particular, colloidal silica has been found to have multiple uses in the paper industry, especially in enhancing retention and drainage of pulp, as described, for example, in U.S. Patent Nos. Especially useful in applications. [0003] Unfortunately, the properties of colloidal silica present sev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/14
CPCD21H17/68D21H21/10C01P2006/12C01B33/148
Inventor 简·B·翁欣陈跖丹尼斯·麦克唐纳罗纳德·S·多勒斯白雯小雷蒙德·D·米勒
Owner ECOLAB USA INC
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