EP0095490A1 - Fibres de verre resistantes aux alkalis - Google Patents

Fibres de verre resistantes aux alkalis

Info

Publication number
EP0095490A1
EP0095490A1 EP19830900157 EP83900157A EP0095490A1 EP 0095490 A1 EP0095490 A1 EP 0095490A1 EP 19830900157 EP19830900157 EP 19830900157 EP 83900157 A EP83900157 A EP 83900157A EP 0095490 A1 EP0095490 A1 EP 0095490A1
Authority
EP
European Patent Office
Prior art keywords
alkali
fibers
resistant glass
glass fibers
percent
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.)
Withdrawn
Application number
EP19830900157
Other languages
German (de)
English (en)
Inventor
John D. Mackenzie
Tetsuro Horiuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Department of Commerce
Original Assignee
US Department of Commerce
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by US Department of Commerce filed Critical US Department of Commerce
Publication of EP0095490A1 publication Critical patent/EP0095490A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C03C13/00—Fibre or filament compositions
    • C03C13/001—Alkali-resistant fibres

Definitions

  • This invention relates to novel alkali-resistant glass fibers, and their preparation.
  • the fibers find particular use in strengthening cement and concrete products, and may find extensive use as substitutes for asbestos in such products.
  • Asbestos fibers have long been used to strengthen cement and concrete products. However, since the recognition of the toxicity of asbestos there have been many attempts to develop fibers to replace it.
  • One of the most important properties of fibers for use in cement and concrete products is resistance to chemical attack by the alkali in the cement mixtures. Because the diameter of the fibers is usually very small, e.g., about 2 to 20 micrometers, a relatively small degree of attack can cause a large decrease in mechanical strength.
  • the fibers are prepared by means of procedures conventionally employed in preparation of glass fibers, i.e., melting of the appropriate admixture of raw materials, followed by drawing or spinning to form the fibers.
  • compositions can be readily, and inexpensively, formed from mixtures of naturally occurring slate and limestone.
  • Suitable raw materials are not, however, limited to freshly mined slate and limestone, but may include waste slate and waste marble, e.g., materials left over from mechanical working of slate and marble. In addition, other materials such as basalt may be used.
  • the raw materials are initally ground, or otherwise reduced, to a suitable particle size, e.g., about 50 to 200 mesh, and are then admixed and melted in suitable refractory vessels such as pots or crucibles of refractory materials such as chromite, alumina, platinum, etc.
  • Suitable melt temperatures are obtained by conventional means, such as electric furnaces or gas furnaces, and will generally range from about 1300 to 1400°C, with the optimum depending on various factors such as the specific composition of the melt, raw materials employed, and desired properties of the product fibers.
  • the admixture is desirably maintained at the melt temperature for a period of about 3 to 5 hours to ensure complete fusion of the ingredients.
  • the molten mixture is then cooled to a temperature, generally about 1100 to 1250°C, suitable for working, and fibers are formed by conventional means such as drawing at high speed through a fine orifice, or by spinning to form a glass wool. Conventional means, such as contacting with screens of appropriate mesh size, are also employed to reduce the fibers to suitable lengths. Optimum diameters and lengths of the fibers will vary with the specific use; however, diameters of about 8 to 12 microns and lengths of about 1/8 to 1/2 inch are generally most suitable for use in cement and concrete products. Fibers thus prepared have been found to have tensil strengths of about 80,000 to 150,000 psi and densities of about 2.75 to 2.95 gm/cc. Alkali resistance of the fibers has been found to be much superior to Pyrex glass and as good as commercially available alkali-resistant glasses.
  • Glass fibers were prepared from three mixtures of Vermont slate and limestone, and were compared with fibers of a commercially available alkali-resistant (AR) glass and pyrex glass.
  • the mixtures of slate and limestone consisted, respectively, of 40% slate and 60% limestone, 50% each of slate and limestone, and 60% slate and 40% limestone.
  • Chemical compositions, in weight %, of the slate-limestone mixtures, as well as the AR and pyrex glasses, are given in Table 1.
  • the slate and limestone were ground to a particle size of 100 mesh and thoroughly mixed by means of a ball- mill.
  • the mixtures were then melted at 1350°C in air, and were maintained at this temperature for a period of about 3-5 hrs .
  • the melt was then cooled to 1150°C, and fibers of a diameter of 20 microns were formed by drawing.
  • the fibers were reduced to lengths of 1/2 to 1 inch by means of mechanical cutters .
  • These fibers , and similar fibers of AR and pyrex glasses were then tested for alkali resistance by reaction in 5% NaOH solution at 90°C for 4 hours. Results of the tests, as well as properties of the glasses are shown in Table 2. It is evident from the data of the table that the glasses of the invention are much superior to Pyrex and are as good as commercially available AR glasses.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

Des fibres de verre résistantes aux alkalis comprennent environ 30 à 60 % de SiO2, 15 à 20 % de Al2O3, 20 à 30 % de CaO et 1 à 10 % de Fe2O3. Les fibres peuvent être obtenues à partir de matériaux bon marché tels que l'ardoise et la pierre à chaux.
EP19830900157 1981-12-04 1982-11-30 Fibres de verre resistantes aux alkalis Withdrawn EP0095490A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32753881A 1981-12-04 1981-12-04
US327538 1999-06-08

Publications (1)

Publication Number Publication Date
EP0095490A1 true EP0095490A1 (fr) 1983-12-07

Family

ID=23276955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830900157 Withdrawn EP0095490A1 (fr) 1981-12-04 1982-11-30 Fibres de verre resistantes aux alkalis

Country Status (3)

Country Link
EP (1) EP0095490A1 (fr)
JP (1) JPS58502054A (fr)
WO (1) WO1983001947A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985002395A1 (fr) * 1983-11-23 1985-06-06 Atlantic Richfield Company Verre modifie par de l'oxyde de bore et resistant aux substances alcalines
WO1985002393A1 (fr) * 1983-11-23 1985-06-06 Atlantic Richfield Company Verres a base d'aluminosilicate-oxyde de calcium, melanges produisant du verre et procedes de production
JPS60231440A (ja) * 1984-04-10 1985-11-18 ウオルト・デイズニー・プロダクシヨンズ アルカリ耐性ガラス、その製造方法、その物質組成並びにアルカリ耐性ガラスを用いた強化セメント
GB2237016A (en) * 1989-09-07 1991-04-24 Dennis Roy Prosser Glass-ceramic material and production thereof
US6043170A (en) * 1996-02-06 2000-03-28 Isover Saint-Gobain Mineral fiber composition
DE19604238A1 (de) * 1996-02-06 1997-08-07 Gruenzweig & Hartmann Mineralfaserzusammensetzung
GB9604264D0 (en) * 1996-02-29 1996-05-01 Rockwool Int Man-made vitreous fibres
US6265335B1 (en) * 1999-03-22 2001-07-24 Armstrong World Industries, Inc. Mineral wool composition with enhanced biosolubility and thermostabilty
AU5526200A (en) * 1999-05-28 2000-12-18 Rockwool International A/S Production of mineral fibres
US8993462B2 (en) 2006-04-12 2015-03-31 James Hardie Technology Limited Surface sealed reinforced building element
ES2316241B1 (es) * 2006-06-01 2009-12-30 Universidade De Santiago De Compostela Procedimiento para la obtencion de fibras vitreas a partir de residuos de pizarra y otros residuos industriales.
US7855170B2 (en) 2008-05-20 2010-12-21 Intevep, S.A. Homogenous synthetic mud-to-cement cementing glasses

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901720A (en) * 1966-07-11 1975-08-26 Nat Res Dev Glass fibres and compositions containing glass fibres
US4002482A (en) * 1975-02-14 1977-01-11 Jenaer Glaswerk Schott & Gen. Glass compositions suitable for incorporation into concrete
JPS539805A (en) * 1976-07-15 1978-01-28 Kogyo Gijutsuin Composite of alkaliiproof glass
SE400273C (sv) * 1976-07-22 1980-08-18 Rockwool Ab Forfaringssett for framstellning av mineralull
DK143938C (da) * 1978-01-02 1982-04-19 Rockwool Int Alkaliresistente,syntetiske mineralfibre og fiberforstaerket produkt paa basis af cement eller calciumsilikat som bindemiddel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8301947A1 *

Also Published As

Publication number Publication date
JPS58502054A (ja) 1983-12-01
WO1983001947A1 (fr) 1983-06-09

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19830805

AK Designated contracting states

Designated state(s): BE DE FR GB NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19831026

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MACKENZIE, JOHN D.

Inventor name: HORIUCHI, TETSURO