Hydration of silicate glasses in alcohol-water solutions

Glass manufacturing – Processes – With chemically reactive treatment of glass preform

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65 30R, 65 32, 65111, 65116, 65DIG14, 423333, 428410, 51307, C03C 1500, C03B 2100

Patent

active

041336658

ABSTRACT:
The present invention is concerned with the production of sodium and/or potassium hydrosilicate glass bodies. The basis of the invention resides in the hydration of anhydrous sodium and/or potassium silicate glass bodies in aqueous alcohol solutions to impart enhanced mechanical strength and thermoplastic properties thereto. The hydrating process, which permits close control to be maintained over the water content absorbed in the glass, can be carried out in liquid solutions of water and relatively short chain, i.e. up to about five carbon atoms, aliphatic alcohols or in gaseous atmospheres of such solutions. An ion exchange reaction of Li.sup.+ ions or protons with Na.sup.+ and/or K.sup.+ ions can be promoted at temperatures above the transformation range of the hydrated glass, and an exchange of K.sup.+ ions for Na.sup.+ and/or Li.sup.+ ions at temperatures below the transformation range. The invention also contemplates treating sodium and/or potassium hydrosilicate glass bodies, produced through the previous hydration of sodium and/or potassium silicate glass bodies, in a gaseous or liquid alcohol or water-alcohol mixture to impart increased strength and impact resistance thereto and alter the absorbed water content therein. The aforementioned ion exchange reactions are also applicable here.

REFERENCES:
patent: 2016892 (1935-10-01), Clarude
patent: 3186816 (1965-06-01), Wartenberg
patent: 3811853 (1974-05-01), Bartholomew et al.
patent: 3816107 (1974-06-01), Searight et al.
patent: 3839226 (1974-10-01), Yates
patent: 3844754 (1974-10-01), Grubb et al.

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