GB2029399A - Alkali-resistant glass fiber composition - Google Patents
Alkali-resistant glass fiber composition Download PDFInfo
- Publication number
- GB2029399A GB2029399A GB7836460A GB7836460A GB2029399A GB 2029399 A GB2029399 A GB 2029399A GB 7836460 A GB7836460 A GB 7836460A GB 7836460 A GB7836460 A GB 7836460A GB 2029399 A GB2029399 A GB 2029399A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- weight
- alkali
- glass composition
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
- C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
- C03C3/115—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron
- C03C3/118—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/001—Alkali-resistant fibres
- C03C13/002—Alkali-resistant fibres containing zirconium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
Abstract
An alkali-resistant fiberizable glass composition is disclosed, consisting, in parts by weight, of SiO2, 50-62 parts; Al2O3, 1-11 parts; Zro2, 4-10 parts; ZnO, 0.5-7 parts; at least one Group IA oxide, 10-19 parts; and at least one Group IIA oxide, 3-15 parts with optional additions of 1-4 parts fluorine (calculated as CaF2) and 3-8 parts B2O3. Glass fiber of this composition is also disclosed, as is a Portland cement matrix reinforced with a plurality of such fibers.
Description
SPECIFICATION
Alkali-resistant glass fiber composition
The invention herein relates to alkali-resistant glass fiber compositions. More particularly it relates to such glass fiber compositions which are resistant to corrosive attack in an alkaline environment such
as Portland cement.
For some years researchers have been working on glass compositions which could be made into fibers and the fibers in turn used as reinforcement in alkaline environments, notably Portland cement A variety of different types of compositions have been suggested in patents and articles for use as alkali
resistant glass fibers. Most, however, have not proven to be practical because they have been difficult
compositions to fiberize or have sacrificed other desirable properties for alkali resistance. Those which
have become commercial have generally been compositions which have been high in the content of zirconia or other costly components.
It would definitely be advantageous to provide an alkali-resistant glass composition which could
be readily fiberized and which would not require the use of large amounts of expensive materials such
as zirconia.
Accordingly, the present invention provides an alkali-resistant glass composition capable of being fiberized, which comprises, in parts by weight: silica, 50-62 parts; alumina, 1-11 1 parts; zirconia, F10 parts; zinc oxide, 0.5-7 parts; at least one Group IA metal oxide, 10-19 parts; and at least one
Group IIA metal oxide, 3-1 5 parts. In a preferred embodiment the composition also contains 1-4
parts by weight of fluorine calculated as calcium fluoride (fluorspar). In another embodiment the
composition may also contain 3-8 parts by weight of boron oxide.
The glass fiber of the present invention comprises the following composition, in parts by weight:
SiO2 50-62 parts
Al203 1-11 parts
ZrO2 410 parts ZnO 0.5-7 parts
Group IA metal oxide 10-1 9 parts
Group IIA metal oxide 3-1 5 parts
Each of these components may be in the form of raw materials ss normally used in glass manufacture. Each may be incorporated into the glass composition by conventional melting and fining prpcedures of glass manufacture.The resulting melt composition is then fiberized in the form of continuous filaments generally having dimensions in the range of from about 8 Hm to about 20 ym. The continuous strand is then chopped into fibers having individual lengths of from about 1/4" (6 mm) up to about 2" (50 mm). It is also possible to fiberize this composition in the form of alkali-resistant wool fibers which are attenuated from melts by blowing or spinning.
The Group I metal oxides may be any of soda, potassic or lithia, or mixtures thereof, although normally soda is by far the predominant Group I metal oxide with substantially less amounts of potassia and generally little or no lithia. The Group II metal oxides may be lime, magnesia or baria or mixtures thereof. Normally lime will be the predominant component with significantly smaller amounts of magnesia and/or baria. In the case of both the Group IA and Group IIA metal oxides the predominance of soda and lime respectively is based largely on economics and availability and is not particularly critical. In addition, both lime and soda impart better melting and final viscosity properties to the glass than do the other oxides of their respective groups.
In a preferred embodiment the composition also comprises 1-4 parts by weight of fluorine calculated as calcium fluoride (fluorspar). The composition may also contain boron oxide as a fluxing agent in an amount of 3-8 parts by weight. Since the various oxides are incorporated into the composition in the form of mineral raw materials rather than as purified oxides, there will also normally be small amounts of impurity materials present. These may include such things as iron oxides. Normally such impurities will amount to less than about 1 part by weight of the composition.
A number of compositions of the present invention are iliustrated below in Table I. Component amouhts are shown in parts by weight. Their alkali-resistant properties are compared to a standard type of non-alkali-resistant glass fiber known as "E glass". Durability is determined oR the basis of percent weight loss for a 10 micron diameter fiber after one hour of boiling in a 0.1 N aqueous solution of sodium hydroxide. Also included for comparison purposes are data on the chemical durability of 10 micron fibers boiled for one hour in 1 N sulfuric acid and in water.
TABLE
Glass Sample
Component A B C D E F G H "E Glass"
SiO2 -50.0 57.0 60.0 57.0 60.0 57.0 57.0 57.0 54.6
Al203 6.1 6.1 6.1 6.1 6.1 6.1 8.1 6.1 14.0
ZrO2 9.0 7.0 4.0 4.0 7.0 7.0 7.0 7.0
ZnO 6.0 4.0 4.0 4.0 4.0 1.0 2.0 4.0
Group IA:
Na20 10.0 13.9 13.9 13.9 13.9 13.9 14.2 15.9 0.2
K20 1.3 1.3 1.3 1.3 1.3 1.3 1.5 1.3 0.2
Group IIA:
CaO 6.9 6.9 6.9 6.9 3.9 6.9 6.9 6.9 17.5
MgO 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 5.0
BaO 2.0 - - - - - - - - Other::
B203 5.0 - - 3.0 - 3.0 - - 8.0
CaF2 3.5 3.5 3.5 3.5 3.5 3.5 3.0 1.5 0.4
Weight Loss %
Reagent
0.1 N NaOH 0.56 0.33 0.93 0.92 0.66 1.13 0.92 1.07 4.23
1 N H2S04 8.24 1.48 0.77 1.22 0.62 1.05 1.08 0.84 50.00
Water 0.36 0.52 0.70 0.59 0.59 0.80 0.77 0.70 0.80
In another comparison test 14 m diameter glass fiber of the composition shown in Table II was compared to fibers of both "E glass" and a commercial alkali resistant ("AR") glass which is believed to be a high zirconia content glass of the type generally described in the Majumdar patents cited above. In each test the fibers were boiled for one hour in each of the stated reagents. The results are shown in Table Ill.
TABLE II.
SiO2 61.2 parts
Al2O3 5.3 parts
ZerO2 8.5 parts
ZnO 2.8 parts
Group IA:
Na20 14.7 parts
K20 1.0 parts
TABLE II (continued)
Group liA: CaO 5.1 parts
MgO 0.1 parts
Other:
CaF2 1.5 parts
TABLE lil
Weight Loss, %
Glass of Commercial
Reagent Table II "E Glass" "AR" Glass 0.1 N NaOH 0.1 3.0 0.2 1 N H2SO4 0.4 34.2 0.4
Water 0.3 0.8 0.2
It will be immediately evident that the composition of the present invention is the equal of the commercial high zirconia glass in all respects of chemical durability. It will also be evident that it is superior in alkali resistance and acid resistance to the conventional "E glass" fibers.
These tests also indicate that the fibers of the composition of the present invention will be substantially equivalent to present commercial high zirconia glass fibers for concrete reinforcement, since alkali tests of the type described above have been found to have a significant correlation with performance of fibers in the alkaline environment of concrete.
Claims (6)
1. An alkali-resistant glass composition capable of being fiberized, which comprises, in parts by weight:
SiO2 50--62 parts
Al203 1-11 parts Zero, 4-10 parts
ZnO 0.5-7 parts
Group IA metal oxide 10-19 parts
Group IIA metal oxide 3-15 parts
2. A glass composition as defined in Claim 1 also comprising 1 1 parts by weight of fluorine calculated as calcium fluoride.
3. A glass composition as defined in Claim 1 or Claim 2 also comprising 3-8 parts by weight of boron oxide.
4. A glass composition as defined in any of Claims 1-3 which comprises, in parts by weight: SiO 61.2 parts
Al2O3 5.3 parts Zero, 8.5 parts
ZnO 2.8 parts
CaO 5.1 parts Na2O 14.7 parts
CaF2 1.5 parts
5. Glass fiber formed oaf a composition as defined in any of Claims 1 4.
6. A glass composition as claimed in Claim 1 which consists of, in parts by weight:
SiO2 61.2 parts Awl203 5.3 parts Zero, 8.5 parts
ZnO 2.8 parts
CaO 5.1 parts
MgO 0.1 parts
Na20 14.7 parts
K20 1.0 parts
CaF2 1.5 parts
6. A Portland cement matrix reinforced by a plurality of fibers having a composition as recited in any of Claims 1-4.
7. An alkali-resistant glass composition substantially as described in the specification.
New claims or amendments to claims filed on 12 April 79.
Superseded claims 2 and 3 deleted appendant claims renumbered and appendancies corrected.
7 deleted.
New or amended claims:-- 1, 5 and 6.
1. An alkali-resistant glass composition capable of being fiberized, which consists of at least components (a) to (f), in parts by weight:
(a) SiO2 50--62 parts
(b) Awl203 1-11 parts
(c) ZrO2 4-10 parts
(d) ZnO 0.5-7 parts
(e) Group IA metal oxide 10-19 parts
(f) Group IIA metal oxide 3-15 parts
(g) fluorine calculated as CaF2 1-4 parts (when present)
(h) boron oxide 3-8 parts(when present)
5. An alkali-resistant glass composition consisting of the components specified in any one of
Samples (A) to (H) in Table 1 and having the proportions, in parts by weight, specified therein.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7836460A GB2029399B (en) | 1978-09-12 | 1978-09-12 | Alkali-resistant glass fibre composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7836460A GB2029399B (en) | 1978-09-12 | 1978-09-12 | Alkali-resistant glass fibre composition |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2029399A true GB2029399A (en) | 1980-03-19 |
GB2029399B GB2029399B (en) | 1983-03-30 |
Family
ID=10499603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7836460A Expired GB2029399B (en) | 1978-09-12 | 1978-09-12 | Alkali-resistant glass fibre composition |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2029399B (en) |
-
1978
- 1978-09-12 GB GB7836460A patent/GB2029399B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2029399B (en) | 1983-03-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |