Method of preparing an aggregate metal oxide particle dispersion having a desired aggregate particle diameter
a metal oxide and dispersion technology, applied in the field of preparing a metal oxide particle dispersion having a desired aggregate particle diameter, can solve the problems of reducing the usefulness of such dispersions, and achieve the effects of reducing the aggregate particle diameter of aggregate silica particles, and reducing the aggregate particle diameter of aggregate alumina particles
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example 1
[0051]This example illustrates the preparation of a dispersion of aggregate metal oxide particles, and the reduction of the average aggregate particle size of the dispersion, in accordance with the invention. This example also illustrates the preparation of a dispersion standard, in accordance with the invention.
[0052]The maximum dispersible solids concentration for fumed silica particles was determined for various lots of fumed silica having primary particle diameters ranging from 6 nm to 53 nm, which correspond to a BET surface area range of from about 344 m2 / g to about 53 m2 / g. The dispersions were prepared by adding about 0.002 g of a 37% HCl solution per gram of fumed silica to 200 g of water to provide a dispersion liquid in a Waring blender. Fumed silica was then added to the acidified water in the Waring blender in aliquots. After each addition, the blender was run at high speed until a noticeable drop in viscosity occurred (about 5 minutes). The next aliquot of fumed silica...
example 2
[0059]This example demonstrates that the dispersion standard of Example 1 can be used to prepare a dispersion of aggregate metal oxide particles having a desired percent-reduction in particle size.
[0060]200 g of water and 0.3 g of a 37% HCl solution were combined in a Waring blender. 114 g of fumed silica having a primary particle size of 6 nm was weighed out. 40% of the fumed silica was added to the blender and was milled for about 10-20 minutes. Milling was stopped, and the walls of the blender were scraped. Milling was continued for an additional 5 minutes at 10,000 rpm, followed by the addition of another aliquot of 40% of the fumed silica. The milling was continued for 5 minutes, and the remaining 20% of the fumed silica was added. The total solids content after addition of all of the fumed silica was about 36 wt. %. After 15 minutes of additional milling, the dispersion was diluted with 252 g water and stabilized with 4.4 grams of 45 wt. % KOH to provide a dispersion with 20 w...
example 3
[0062]This example illustrates the use of the method of the invention to reduce the average aggregate particle diameter of fumed alumina particles.
[0063]210 g of water and 7.5 g of a 37% HCl solution was combined in a Waring blender. 360 grams of 55 m2 / g fumed alumina was weighed out. 60% of the alumina was added to the blender and was milled for 10 to 20 minutes. Milling was stopped, and the walls of the blender were scraped. Milling was continued at 10,000 rpm for 5 minutes. The remaining 40% of the fumed alumina was added, followed by additional milling for 15 minutes. The final solids concentration at this point was 63%. The dispersion was diluted with 327 g of water to provide a 40% alumina dispersion.
[0064]The average aggregate particle diameter of the fumed alumina particles before milling was about 22 nm. After milling, the average aggregate particle diameter was reduced by about 33% to about 68 nm. This example demonstrates that the method of the invention can be used to ef...
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