Process for producing high solids colloidal silica
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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: 2015-10-28
ECOLAB USA INC
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In addition, other factors can also compromise the stability of microparticles
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[0050] 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.
[0051] 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.
[0052] I) Unmodified
[0053] II) Add cationic resin to reduce conductivity
[0054] III) Apply ultrafiltration
[0055] IV) Di-filtration is applied.
[0056] Properties of these samples are listed below.
[0057]Table 1
[0058]
[0059] The stability of these colloids is as follows:
[0060] Table 2
[0061]
[0062] Th...
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Abstract
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.
Description
Background of the invention [0001] 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 be very useful in the paper industry, especially in enhancing the retention and drainage of pulp, as described, for example, in U.S. Patent Nos. Especially useful in this application. [0002] Unfortunately, the properties of colloidal silica present severa...
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