Stabilized mixtures of colloidal silica and soluble silicate and a method of producing porous silica compositions therefrom
AssigneeThe Dow Chemical Company
InventorJuan M. Garces
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Abstract
A prereaction mixture which is useful in the preparation of porous silica compositions with uniform pore sizes. The porous silica composition comprises a substituted nitrogen-containing siliconate, a colloidal silica and a soluble alkali silicate. By the addition of the substituted nitrogen containing siliconate to either the colloidal silica or soluble silicate, or by combining all three ingredients, a stable solution results, thereby avoiding the premature polymerization of the colloidal silica upon the addition of the soluble silicate. The soluble alkali silicate can have a metal cation which is selected from the group consisting of potassium and sodium.
Claims8
In a method of preparing a porous silica composition with uniform pore size, wherein aqueous colloidal silica is blended with a soluble silicate and a gelating agent and the blend is subsequently polymerized to produce the porous silica composition, the improvement which comprises preblending at least one of the aqueous collodial silica solution and the soluble alkali silicate solution with an effective stabilizing amount of a substituted nitrogen-containing siliconate whereby the blend is stabilized against premature polymerization of silicate.
Dependencies are inferred from the claim text.