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Stable aqueous colloidal silica product, and methods to make and use same

Inactive Publication Date: 2014-09-11
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new type of aqueous colloidal silica product that can be stored for a long time without losing its effectiveness. The silica is produced by mixing a solution containing sodium silicate and an ion exchange resin, and then adding more sodium silicate and a polymeric flocculant to form a gel. The product has specific properties that make it useful in a variety of applications, such as being stable at room temperature for at least 30 days. When used in making cellulosic sheets, the colloidal silica product helps improve the strength and flexibility of the sheets.

Problems solved by technology

Second, charging the reaction vessel with water and stirring the contents of the reaction vessel.

Method used

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  • Stable aqueous colloidal silica product, and methods to make and use same
  • Stable aqueous colloidal silica product, and methods to make and use same

Examples

Experimental program
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Effect test

example 1

[0067]Preparation of a Colloidal Silica Sol of the Invention. Inventive aqueous colloidal silica products (Samples 7-15 in Table 1) were prepared using the lab-scale semi-batch procedure described as follows. Charge a reaction vessel with 600 mL of Amberlite® IRC84SP ion exchange resin (available from Dow) in its sodium form. Following manufacturer's procedure for regenerating the resin to the hydrogen form such that the regeneration is at least 40 percent complete. Rinse the resin clean with water and drain the water. Charge 190-380 grams of water into the vessel and start mixing the contents of the vessel to suspend the resin. Next, heat the contents of the reactor to 100-160 degrees F. Charge the reaction vessel (over a period of about 2-20 minutes) with 186-505 grams of sodium silicate (having a mole ratio of SiO2 to Na2O of 3.26 and a pH of 11.2). After 1-45 min, charge the reaction vessel (over a period of about 5-30 minutes) with 13-160 grams of sodium silicate. Stir the cont...

example 2

[0070]For Example 2, inventive aqueous colloidal silica products (Samples 16-29 in Table 2) were prepared using the following pilot-scale semi-batch procedure. Charge a reaction vessel with 185 gallons of Amberlite® IRC84SP ion exchange resin (available from Dow) in its sodium form. Following manufacturer's procedure for regenerating the resin to the hydrogen form such that the regeneration is at least 40 percent complete. Rinse the resin clean with water and drain the water. Charge 683-1158 lbs of water into the vessel and start mixing the contents of the vessel to suspend the resin. Next, heat the contents of the reactor to 100-160 degrees F. Charge the reaction vessel (over a period of about 2-20 minutes) with 574-1320 lbs of sodium silicate (having a mole ratio of SiO2 to Na2O of 3.26 and a pH of 11.2). After 1-45 min, charge the reaction vessel (over a period of about 5-30 minutes) with 41-417 lbs of sodium silicate. Stir the contents in the reaction vessel for another 10-180 m...

example 3

[0072]A control sample and Samples 17-19 of Example 2 were utilized in comparison experiments related to first pass ash retention of each. Each of the samples were dosed onto a cellulosic furnish.

[0073]As can be seen, a 90% first pass ash retention can be achieved using approximately 0.5 to 0.8 as much microparticle dosage (FPAR replacement ratio) for each of Samples 17-19, as compared to the control sample. These results are graphically demonstrated in FIG. 1.

MicroparticleFirst Pass Ash Retention (%)Dosage, lbSampleSample Samplemicroparicles / tonControl171819073.573.573.573.50.2579.276.376.779.10.580.582.783.084.0185.590.488.290.41.589.395.194.994.6292.294.894.996.9

[0074]As can be seen, the inventive aqueous colloidal silica products prepared using the inventive production method provided superior results compared to the control sample.

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Abstract

An aqueous colloidal silica product, a method of using the aqueous colloidal silica product, and a method of producing an aqueous colloidal silica product, are disclosed. The method of producing the aqueous colloidal silica product incorporates semi-batch addition of alkali metal silicate, which is capable of achieving an aqueous colloidal silica product having desirable physical and chemical characteristics. The aqueous colloidal silica product has been found to be particularly useful as an additive in a papermaking process.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation-in-part of U.S. patent application Ser. No. 13 / 791,627, filed Mar. 8, 2013, the disclosure of which is herein incorporated by reference in its entirety.FIELD[0002]At least one embodiment of the invention is directed to colloidal silica sols having high solids contents and low viscosity, while maintaining high surface area and enhanced stability. It is also directed to a new process involving a semi-batch addition for making such colloidal silica sols and to the use of such colloidal silica sols in a production of paper. At least one embodiment of the invention is directed to an aqueous colloidal silica product, a method of using an aqueous colloidal silica product, and a method of producing an aqueous colloidal silica product. The aqueous colloidal silica product is stable and has a lower viscosity than thought to be achievable for products having a colloidal silica solids concentration ranging fr...

Claims

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Application Information

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IPC IPC(8): D21H21/10
CPCD21H21/10D21H17/68D21H21/52
Inventor LI, MINGHUAWONG SHING, JANEMILLER, JR., RAYMOND D.
Owner ECOLAB USA INC