Silica-alumina composite sol and process for production thereof

A technology of silica and composite sol, which is applied in the direction of sol preparation, chemical instruments and methods, silicon compounds, etc., to achieve high transparency, excellent mixing and dispersibility, excellent film forming and water resistance effects

Inactive Publication Date: 2009-09-16
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this way, in silica sol, positively charged silica sol, alumina sol, or a sol obtained by mixing them, the film obtained by drying on a solid surface has excellent film-forming properties and water resistance, and has Highly transparent sols are not yet known

Method used

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  • Silica-alumina composite sol and process for production thereof
  • Silica-alumina composite sol and process for production thereof
  • Silica-alumina composite sol and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Step (A): 1369g of basic aluminum acetate aqueous solution (Al 2 o 3 Converted solid content 5.8% by mass, specific gravity 1.068, pH 5.9, electrical conductivity 5730 μS / cm, Ostwald viscosity 3.0 mPa·s). This aqueous solution was used a dispersing type mixer (ナシ ヨ ナルベビ-モ-タSCVS75W (trade name): manufactured by Matsushita Electric Industrial Co., Ltd.) was stirred at 4000 rpm while continuously adding 120 g of 68 mass % acetic acid aqueous solution for 5 minutes, and continued stirring for 2 hours. Then, 511 g of commercially available acidic aqueous silica sol (スノ-テ ツ クスOXS (trade name): manufactured by Nissan Chemical Industry Co., Ltd., specific gravity 1.059, pH 2.9, Ostwald viscosity at 25° C. 1.1 mPa·s, silica (SiO 2 ) concentration of 10.2% by mass, primary particle size measured by Sears titration of 5 nm), and continuous stirring for 2 hours to obtain 2000 g of transparent mixed sol. The resulting mixed sol contained 2.7 mass% SiO 2 , 4.1 mass% Al 2 o 3 ,...

Embodiment 2

[0068] Step (A): Add 432g of basic aluminum acetate aqueous solution (Al 2 o 3 The converted solid content is 5.8% by mass, the specific gravity is 1.068, the pH is 5.9, the electrical conductivity is 5730 μS / cm, and the Ostwald viscosity (25° C.) is 3.0 mPa·s). This aqueous solution was used a dispersing type mixer (ナシ ヨ ナルベビ-モ-タSCVS75W (trade name): manufactured by Matsushita Electric Industrial Co., Ltd.) was stirred at 1000rpm, and 698g of pure water was added to dilute, so that Al 2 o 3 It is 2.2% by mass. The stirring speed was changed to 4000 rpm, 37 g of 68 mass % acetic acid aqueous solution was continuously added to this aqueous solution over 5 minutes, and stirring was continued for 2 hours. Then, while maintaining the same stirring speed, continuously add the following acidic aqueous silica sol for 1 hour, the acidic aqueous silica sol is 245 g of commercially available acidic aqueous silica sol (Snow-te ツクスOXS (trade name): manufactured by Nissan Chemical Ind...

Embodiment 3

[0070] Step (A): Add 146g of basic aluminum nitrate aqueous solution (Al 2 o 3 Converted solid content 20.6% by mass, specific gravity 1.068, pH 5.9, electrical conductivity 5730 μS / cm, Ostwald viscosity (25° C.) 3.0 mPa·s). The aqueous solution was mixed with a dispersing mixer (ナシ ヨ ナルベビ-モ-タSCVS75W (trade name): manufactured by Matsushita Electric Industrial Co., Ltd.) was stirred at 1000rpm, and 1187g of pure water was added under stirring to dilute, so that Al 2 o 3 The converted solid content was 2.3% by mass. The stirring speed was changed to 4000 rpm, and stirring was continued for 2 hours. Then, while maintaining the stirring speed, continuously add the following acidic aqueous silica sol for one hour, the acidic aqueous silica sol is 196 g of commercially available acidic aqueous silica sol (Snow-te ツ クスOXS (trade name): manufactured by Nissan Chemical Industry Co., Ltd., specific gravity 1.059, pH 2.9, Ostwald viscosity (25° C.) 1.1 mPa·s, silica concentration 1...

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Abstract

The present invention provides a silica-alumina composite sol having excellent transparency, film-forming property and water resistance, which comprises a composite colloid particle comprising a colloidal silica particle coated with a fine colloidal alumina hydrate particle and a colloidal alumina hydrate particle having a major axis diameter 10-fold or more greater than the diameter of a primary particle of the colloidal silica particle bound to each other; and a process for producing the silica-alumina composite sol. Disclosed is a silica-alumina composite sol which comprises a composite colloid particle comprising a colloidal silica particle coated with a fine colloidal alumina hydrate particle and a colloidal alumina hydrate particle bound to each other, wherein the colloidal alumina hydrate particle has a major axis diameter 10-fold or more greater than the diameter of a primary particle of the colloidal silica particle and a minor axis diameter of 2 to 10 nm. Also disclosed is a process for producing the silica-alumina composite sol.

Description

technical field [0001] The present invention relates to a silica-alumina composite sol comprising colloidal silica particles and colloidal alumina hydrate particles coated with fine colloidal alumina hydrate particles and a method for producing the same Combined composite colloidal particles. [0002] The silica-alumina composite sol of the present invention has the characteristics of both silica sol and alumina sol, and exhibits excellent transparency, film-forming properties, and water resistance if dried on a solid surface. In addition, since the composite colloidal particles contained in the silica-alumina composite sol of the present invention are positively charged, compatibility with cationic surfactants, cationic colloids, cationic emulsions or cationic powders, etc., It is excellent in miscibility and dispersibility, so it can be used in combination with these cationic materials. [0003] Since the silica-alumina composite sol of the present invention has high trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/149B01J13/00
CPCB01J13/0008C01B33/149B01J13/00
Inventor 山口健二大森丰村上智
Owner NISSAN CHEM IND LTD
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