Colloidal silica composition and production method thereof
OwnerKeun-Deok Park, Jeong-Hyun Oh +2inventors
InventorsKeun-Deok Park, Jeong-Hyun Oh, Sang-Jin Lee, Ji-Myung Hyun
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Abstract
Disclosed is a colloidal silica composition and a method for producing high-purity silica glass using the same. The colloidal silica composition of the present invention comprise an alkoxysilane compound, an organic solvent, deionized water, and a basic catalyst. The colloidal silica composition further includes a basic organic material for adjusting a hydrogen ion concentration (pH) to prevent the formation of agglomerates when concentrated. Silica glass having high purity and excellent sinterability can be produced using the colloidal silica composition of the present invention.
Claims14
A colloidal silica composition comprising:
- an alkoxysilane compound;
- an organic solvent;
- deionized water;
- and,
- a basic catalyst, wherein the colloidal silica composition further includes a basic organic material for adjusting a hydrogen ion concentration (pH) to prevent the formation of agglomerates when the colloidal silica composition is concentrated.
A method for producing a colloidal silica composition, the method comprising the steps of:
- mixing and agitating an alkoxysilane compound, an organic solvent, deionized water, and a basic catalyst to produce colloidal silica;
- washing the colloidal silica with deionized water to remove byproducts;
- adding a basic organic material to the colloidal silica to adjust a hydrogen ion concentration (pH);
- and,
- concentrating the pH-adjusted colloidal silica.
A method for producing silica glass comprising the steps of:
- mixing and agitating an alkoxysilane compound, an organic solvent, deionized water, and a basic catalyst to produce colloidal silica;
- adding a basic organic material to the colloidal silica to adjust a hydrogen ion concentration (pH);
- concentrating the pH-adjusted colloidal silica until a concentration of the colloidal silica becomes 45% or more;
- adding ester material to the concentrated colloidal silica;
- and,
- injecting and molding the resulting colloidal silica in a mold to cause gelation of the colloidal silica.
Dependencies are inferred from the claim text.