WO1991016273A1 - Compositions de verre de calcia-alumino-boro-silicate - Google Patents

Compositions de verre de calcia-alumino-boro-silicate Download PDF

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Publication number
WO1991016273A1
WO1991016273A1 PCT/US1991/002334 US9102334W WO9116273A1 WO 1991016273 A1 WO1991016273 A1 WO 1991016273A1 US 9102334 W US9102334 W US 9102334W WO 9116273 A1 WO9116273 A1 WO 9116273A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass
cao
composition according
glass composition
microspheres
Prior art date
Application number
PCT/US1991/002334
Other languages
English (en)
Inventor
John Paul Stevenson
John F. Collins
Original Assignee
United States Borax & Chemical Corporation
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
Priority claimed from GB9009246A external-priority patent/GB2243604A/en
Application filed by United States Borax & Chemical Corporation filed Critical United States Borax & Chemical Corporation
Publication of WO1991016273A1 publication Critical patent/WO1991016273A1/fr

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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
    • C03C3/089—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
    • 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
    • C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
    • C03C11/002—Hollow glass particles
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron

Definitions

  • the invention relates to glass compositions for use in the preparation of glass microspheres.
  • Hollow glass microspheres are used, for example, as bulk, lightweight fillers for reinforced plastic components for the motor industry. They find use also as hollow microbubbles for adhesives. They can be prepared, for example, by pulsing an inert gas, such as argon into a continuous stream of molten glass in order to produce individual microspheres. For best results, the molten glass should be at a temperature such that the melt has a viscosity of about 2 Pas (20 poise). This temperature is known as the 20 poise temperature (20 PT). The glass compositions previously proposed for use in the preparation of hollow glass microspheres in this way have had 20 PT values in the region of 1440° to 1450°C.
  • a standard E- Glass composition (analyzing 53.4 wt % SiO 2 , 13.9 wt % Al 2 O 3 , 8.9 wt % B 2 O 3 , 21.7 wt % CaO, 0.3 wt % Na 2 O and 0.7 wt % K 2 O), such as is used in providing glass fibers for reinforcing plastics, has a 20 PT of 1447°C.
  • a borosilicate glass composition used in the preparation of glass microspheres (analyzing 44.7 wt % SiO 2 , 12.5 wt %
  • 0.7 wt % K 2 O has a PT of 1444°C.
  • Such high 20 PT values can cause a reduced service life for metal parts, such as platinum bushings, employed in the manufacture of microspheres and are of course associated with high energy requirements. Accordingly it is desired to provide glass compositions suitable for use in the preparation of glass microspheres but having lower 20 PT values than the glass compositions hitherto used.
  • This invention provides glass compositions for use in the preparation of glass microspheres comprising 38 to 44% SiO 2 , 14 to 22% B 2 O 3 , 9 to 16% Al 2 O 3 , 22 to 26% CaO, 0 to 8% Na 2 O, 0 to 2 % Li 2 O, 0 to 2% K 2 O and 0 to 1% Fe 2 O 3 , the sum of B 2 O 3 and Na 2 O being at least 19%, said percentages being by weight.
  • a portion of the CaO in the composition such as up about 50%, may be substituted by MgO.
  • the glass composition comprises 39 to 43% SiO 2 , 19 to 22% B 2 O 3 , 9 to 13% Al 2 O 3 , 22 to 26% CaO and optionally MgO, 4 to 6% Na 2 O, 0 to 1% K 2 O and 0.2 to 0.4% Fe 2 O 3 .
  • a particularly preferred composition is one which consists essentially of about 40% SiO 2 , about
  • the glass compositions provided in accordance with this invention preferably have 20 PT values below about 1350°C, especially below 1300°C.
  • the B 2 O 3 content either alone or combined with the Na 2 O content, has an important effect in reducing the 20 PT value.
  • the B 2 O 3 content is too high, say 25 to 30 wt %, the glass becomes opalescent and its viscosity is undesirably increased.
  • the optimum B 2 O 3 content is from 20 to 21% when the glass composition contains 0 to 5% Na 2 O.
  • a particularly preferred Na 2 O content is about 5 wt % since it has been found that this amount of Na 2 O can be more effective in lowering the 20 PT value than a lower amount (e.g. 2.5 wt %) or higher amount (e.g. about 7.5 wt %).
  • Weight for weight Li 2 O is more effective in reducing the viscosity of a glass (i.e. is a better flux) than Na 2 O, but is more expensive.
  • Al 2 O 3 is a refractory material and increases the viscosity of most glasses. It is generally added to glasses to improve their aqueous durability. The optimum amount is from 9 to 14%, especially 9 to 11%, Al 2 O 3 .
  • the glass compositions contain CaO rather than both CaO and MgO . Nevertheless mixtures of CaO and MgO can be used if desired, the amount of MgO suitably being up to about half the total amount of CaO and MgO.
  • Fe 2 O 3 is normally present in E-type glasses to improve radiation heat transfer into the glass during gas firing and heat radiation from fibers during cooling. It can be present, for example in amounts of up to 1 wt %, preferably 0.2 to 0.4 wt %, especially about 0.3 wt %, in the glass compositions of this invention to improve heat transfer. Fe 2 O 3 also contributes to the fluxing action.
  • This invention also relates to the use of the glass compositions in the preparation of glass microspheres.
  • This can suitably be done by pulsing an inert gas, preferably argon, into a continuous melt of said glass compositions to produce individual microspheres.
  • the melt will preferably have a viscosity of about 2 Pas (20 poise).

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 compositions de verre utilisées dans la préparation de microsphères de verre et ayant des températures de fusion réduites produisant une viscosité de 2 Pas (20 poise), comprennent de 38 à 44 % de SiO2, 14 à 22 % de B2O3, 9 à 16 % de Al2O3, 22 à 26 % de CaO et facultativement de MgO, 0 à 8 % de Na2O, 0 à 2 % de Li2O, 0 à 2 % de K2O et O à 1 % de Fe2O3, la somme de B2O3 et Na2O représentant au moins 19 %, lesdits pourcentages étant des pourcentages en poids.
PCT/US1991/002334 1990-04-25 1991-04-04 Compositions de verre de calcia-alumino-boro-silicate WO1991016273A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9009246A GB2243604A (en) 1990-04-25 1990-04-25 Glass compositions
GB9009246.1 1990-04-25
US07/554,059 US5100842A (en) 1990-04-25 1990-07-16 Glass compositions
US554,059 1990-07-16

Publications (1)

Publication Number Publication Date
WO1991016273A1 true WO1991016273A1 (fr) 1991-10-31

Family

ID=26296991

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/002334 WO1991016273A1 (fr) 1990-04-25 1991-04-04 Compositions de verre de calcia-alumino-boro-silicate

Country Status (1)

Country Link
WO (1) WO1991016273A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2017236A1 (fr) * 2006-05-02 2009-01-21 Nippon Sheet Glass Company, Limited Composition de verre et entretoise de verre utilisant ladite composition
WO2015013129A1 (fr) * 2013-07-23 2015-01-29 Rogers Corporation Matériaux de circuit, stratifiés de circuit et procédés de fabrication de ces derniers
EP3184494A1 (fr) * 2015-12-21 2017-06-28 ADF Materials GmbH Composition chimique pour la production de particules sphériques en verre creux présentant une résistance élevée à la compression

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681289A (en) * 1950-03-04 1954-06-15 Gustin Bacon Mfg Co Glass composition
US2834738A (en) * 1954-08-25 1958-05-13 Ici Ltd Production of skeletal glass catalysts
US3150947A (en) * 1961-07-13 1964-09-29 Flex O Lite Mfg Corp Method for production of glass beads by dispersion of molten glass
US3207588A (en) * 1962-03-16 1965-09-21 Owens Corning Fiberglass Corp Glass foam
US3459630A (en) * 1965-09-23 1969-08-05 Pittsburgh Corning Corp Arcuately shaped cellular glass article and method of making the same
US3843376A (en) * 1971-04-24 1974-10-22 Philips Corp Method of manufacturing a mixture for a borosilicate glass
US4215033A (en) * 1978-09-08 1980-07-29 American Dental Association Health Foundation Composite dental material
US4983550A (en) * 1988-08-24 1991-01-08 Potters Industries, Inc. Hollow glass spheres

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681289A (en) * 1950-03-04 1954-06-15 Gustin Bacon Mfg Co Glass composition
US2834738A (en) * 1954-08-25 1958-05-13 Ici Ltd Production of skeletal glass catalysts
US3150947A (en) * 1961-07-13 1964-09-29 Flex O Lite Mfg Corp Method for production of glass beads by dispersion of molten glass
US3207588A (en) * 1962-03-16 1965-09-21 Owens Corning Fiberglass Corp Glass foam
US3459630A (en) * 1965-09-23 1969-08-05 Pittsburgh Corning Corp Arcuately shaped cellular glass article and method of making the same
US3843376A (en) * 1971-04-24 1974-10-22 Philips Corp Method of manufacturing a mixture for a borosilicate glass
US4215033A (en) * 1978-09-08 1980-07-29 American Dental Association Health Foundation Composite dental material
US4983550A (en) * 1988-08-24 1991-01-08 Potters Industries, Inc. Hollow glass spheres

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2017236A1 (fr) * 2006-05-02 2009-01-21 Nippon Sheet Glass Company, Limited Composition de verre et entretoise de verre utilisant ladite composition
EP2017236A4 (fr) * 2006-05-02 2009-12-16 Nippon Sheet Glass Co Ltd Composition de verre et entretoise de verre utilisant ladite composition
WO2015013129A1 (fr) * 2013-07-23 2015-01-29 Rogers Corporation Matériaux de circuit, stratifiés de circuit et procédés de fabrication de ces derniers
US9258892B2 (en) 2013-07-23 2016-02-09 Rogers Corporation Circuit materials, circuits laminates, and method of manufacture thereof
CN109951952A (zh) * 2013-07-23 2019-06-28 罗杰斯公司 电路组件
CN109951952B (zh) * 2013-07-23 2022-02-01 罗杰斯公司 电路组件
EP3184494A1 (fr) * 2015-12-21 2017-06-28 ADF Materials GmbH Composition chimique pour la production de particules sphériques en verre creux présentant une résistance élevée à la compression
WO2017108831A1 (fr) * 2015-12-21 2017-06-29 Adf Materials Gmbh Composition chimique pour la production de particules de verre sphériques creuses à haute résistance à la compression
US10414689B2 (en) 2015-12-21 2019-09-17 Omya International Ag Chemical composition for production of hollow spherical glass particles with high compressive strength

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