C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
49/8
C03C 13/00 (2006.01) C03B 37/02 (2006.01)
Patent
CA 2290385
There is provided a method for forming a water-soluble glass fibre or wool. The method comprises heating the glass composition above its melting point to produce a molten glass and then cooling the molten glass slowly to a pre- selected working temperature at which the fibres will be drawn. Suitable working temperature include those in a range of 400 to 1000 ~C. The working temperature will usually be at least 200 ~C lower than the temperature to which the molten glass is heated above its melting point and may be 50-300 ~C above the Tg of the glass. Phosphorous pentoxide is suitable as a glass former and B203 may be present as an additive. Optionally the glass may release silver ions, e.g. by addition of silver orthophosphate during manufacture of the glass.
On décrit un procédé de formation d'une fibre ou laine de verre soluble dans l'eau. Le procédé consiste à chauffer la composition de verre au-delà de son point de fusion pour obtenir du verre liquide, puis à refroidir lentement le verre liquide jusqu'à une température de marche préétablie à laquelle les fibres seront étirées. Des températures de marche appropriées incluent celles comprises entre 400 et 1000 ·C. La température de marche sera généralement au moins inférieure de 200 ·C à la température à laquelle le verre liquide est chauffé au-delà de son point de fusion, et peut se situer entre 50 et 300 ·C au-dessus de la Tg du verre. L'anhydride phosphorique convient comme substance de formation du verre et B203 peut être utilisé comme un additif. Le verre peut libérer éventuellement des ions argent, par exemple, par addition d'orthophosphate d'argent pendant la fabrication du verre.
Gilchrist Thomas
Healy David Michael
Fetherstonhaugh & Co.
Giltech Limited
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