Glass fiber and method for producing same

Patent metadata

Field	Value
Publication number	US-11577990-B2
Application number	US-201816768324-A
Country	US
Kind code	B2
Filing date	Nov 21, 2018
Priority date	Dec 5, 2017
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

Provided is a glass fiber having a low spinning temperature and a low liquidus temperature, and besides, having a large difference between the liquidus temperature and the spinning temperature, and a method of manufacturing the same. The glass fiber of the present invention includes as a glass composition, in terms of mass % on an oxide basis, 50% to 65% of SiO2, 0% to 3% of Al2O3, 0% to 1% of MgO, 0% to less than 0.7% of CaO, 0% to 1% of Li2O, 10% to 20% of Na2O, 0% to 2% of K2O, 6% to 10% of TiO2, and 15% to 20% of ZrO2, and has a value for (Na2O+K2O)/(MgO+CaO) of 6.0 or more.

First claim

The invention claimed is:

1. A glass fiber, comprising as a glass composition, in terms of mass % on an oxide basis, 50% to 65% of SiO 2 , 0% to 3% of Al 2 O 3 , 0% to 1% of MgO, 0% to less than 0.7% of CaO, 0% to 1% of Li 2 O, 10% to 20% of Na 2 O, 0% to 2% of K 2 O, 6% to 10% of TiO 2 , and 15% to 20% of ZrO 2 , and having a value for (Na 2 O+K 2 O)/(MgO+CaO) from 25 to 30.2.

2. The glass fiber according to claim 1 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

3. The glass fiber according to claim 1 , wherein, when glass of a specific gravity fraction obtained by pulverizing and classifying the glass fiber into a particle size of from 300 μm to 500 μm is immersed in 100 ml of a 10 mass % NaOH aqueous solution under conditions of 80° C. and 90 hours, the glass has a mass reduction rate of 4% or less.

4. The glass fiber according to claim 1 , wherein, when glass of a specific gravity fraction obtained by pulverizing and classifying the glass fiber into a particle size of from 300 μm to 500 μm is immersed in 100 ml of a 10 mass % HCl aqueous solution under conditions of 80° C. and 90 hours, the glass has a mass reduction rate of 4% or less.

5. The glass fiber according to claim 1 , wherein the glass fiber has an alkali elution amount according to JIS R3502 (1995) of 0.35 mg or less.

6. The glass fiber according to claim 1 , wherein the glass fiber has a difference between a spinning temperature and a liquidus temperature of 120° C. or more.

7. The glass fiber according to claim 6 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

8. The glass fiber according to claim 1 , wherein the glass fiber has a spinning temperature of 1,280° C. or less.

9. The glass fiber according to claim 8 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

10. The glass fiber according to claim 8 , wherein the glass fiber has a difference between a spinning temperature and a liquidus temperature of 120° C. or more.

11. The glass fiber according to claim 10 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

12. The glass fiber according to claim 1 , wherein the glass fiber comprises as a glass composition, in terms of mass % on an oxide basis, 0% to 0.1% of MgO and 0% to 0.6% of Li 2 O.

13. The glass fiber according to claim 12 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

14. The glass fiber according to claim 12 , wherein the glass fiber has a difference between a spinning temperature and a liquidus temperature of 120° C. or more.

15. The glass fiber according to claim 14 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

16. The glass fiber according to claim 12 , wherein the glass fiber has a spinning temperature of 1,280° C. or less.

17. The glass fiber according to claim 16 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

18. The glass fiber according to claim 16 , wherein the glass fiber has a difference between a spinning temperature and a liquidus temperature of 120° C. or more.

19. The glass fiber according to claim 18 , wherein the glass fiber has a liquidus temperature of 1,120° C. or less.

20. A method of manufacturing a glass fiber, the method comprising: melting, in a glass melting furnace, a raw material batch blended so as to comprise as a glass composition, in terms of mass % on an oxide basis, 50% to 65% of SiO 2 , 0% to 3% of Al 2 O 3 , 0% to 1% of MgO, 0% to less than 0.7% of CaO, 0% to 1% of Li 2 O, 10% to 20% of Na 2 O, 0% to 2% of K 2 O, 6% to 10% of TiO 2 , and 15% to 20% of ZrO 2 , and have a value for (Na 2 O+K 2 O)/(MgO+CaO) from 25 to 30.2; and continuously drawing the resultant molten glass from a bushing to form the molten glass into a fiber form.

Assignees

• Nippon Electric Glass Co

Inventors

• Yokota Yuki
• SAWASATO Hiroshi
• Matsumoto Minoru

Classifications

• C03C3/087 Primary

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title

• C03C3/085

  containing an oxide of a divalent metal · CPC title

• C03C2213/00

  Glass fibres or filaments · CPC title

• C03B37/04

  by using centrifugal force {, e.g. spinning through radial orifices; Construction of the spinner cups therefor (bonder application C03C25/00)} · CPC title