WO2023190982A1 - Glass fibers - Google Patents

Glass fibers Download PDF

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Publication number
WO2023190982A1
WO2023190982A1 PCT/JP2023/013383 JP2023013383W WO2023190982A1 WO 2023190982 A1 WO2023190982 A1 WO 2023190982A1 JP 2023013383 W JP2023013383 W JP 2023013383W WO 2023190982 A1 WO2023190982 A1 WO 2023190982A1
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Prior art keywords
mass
less
glass
composition
sio
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PCT/JP2023/013383
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French (fr)
Japanese (ja)
Inventor
浩輔 藤原
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日本板硝子株式会社
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Publication of WO2023190982A1 publication Critical patent/WO2023190982A1/en

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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
    • C03C13/00—Fibre or filament compositions
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials

Definitions

  • the present invention relates to glass fibers suitable for use as thermal and/or soundproofing materials.
  • Glass wool is an aggregate of short glass fibers made from glass fibers, and because it contains many air layers inside, it has excellent insulation and sound-absorbing performance, and is used as insulation and sound-absorbing material for buildings, vehicles, etc. It is being Additionally, glass wool does not burn and is used as a noncombustible material.
  • Patent Document 1 discloses that soda lime glass and A glass are preferable as glass fibers for such glass wool.
  • C glass composition is known as a glass composition with excellent chemical durability.
  • the C glass composition contains about 4 to 6% by mass of diboron trioxide (B 2 O 3 ).
  • B 2 O 3 easily scatters when glass raw materials are melted, and corrodes the walls of the melting furnace and the heat storage furnace. Therefore, a glass composition containing B 2 O 3 to the above-mentioned extent can affect the life of the equipment that manufactures it. Therefore, an object of the present invention is to provide a new glass fiber suitable for use as a heat insulating material and/or a sound absorbing material, and also suitable for mass production.
  • the present invention is a glass fiber for a heat insulating material and/or a sound absorbing material, Displayed in mass%, 50 ⁇ SiO 2 ⁇ 75, 0 ⁇ B 2 O 3 ⁇ 4, 5 ⁇ Al 2 O 3 ⁇ 15, 5 ⁇ CaO ⁇ 30, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 20, A glass fiber comprising a glass composition containing the following components is provided.
  • Another aspect of the present invention is a glass fiber for a heat insulating material and/or a sound absorbing material, Displayed in mass%, 50 ⁇ SiO 2 ⁇ 75, 0 ⁇ B 2 O 3 ⁇ 4, 0.1 ⁇ (MgO+CaO) ⁇ 20, 9 ⁇ ( Li2O + Na2O + K2O ) ⁇ 20, 5 ⁇ ZrO 2 ⁇ 20,
  • a glass fiber comprising a glass composition containing the following components is provided.
  • a new glass fiber is provided that is suitable for use in heat insulating materials and/or sound absorbing materials, and is also suitable for mass production.
  • not substantially containing and not substantially containing mean that the content is less than 0.1% by mass, less than 0.05% by mass, less than 0.01% by mass, and even 0. This means less than 0.005% by weight, in particular less than 0.003% by weight, and in some cases less than 0.001% by weight.
  • substantially means that the inclusion of trace amounts of impurities originating from glass raw materials, manufacturing equipment, molding equipment, etc. is allowed.
  • Mainn component means a component having the highest content on a mass basis.
  • T-Fe 2 O 3 means total iron oxide converted to diiron trioxide (Fe 2 O 3 ).
  • Alkali metal oxide means lithium oxide (Li 2 O), sodium oxide (Na 2 O) and potassium oxide (K 2 O). The upper and lower limits of the content described below can be arbitrarily combined.
  • glass fiber for heat insulating material and/or sound absorbing material specifically means “glass fiber used as at least one selected from the group consisting of heat insulating material and sound absorbing material.”
  • Glass composition A An example of a glass composition (hereinafter referred to as glass composition A) is expressed in mass%, 50 ⁇ SiO 2 ⁇ 75, 0 ⁇ B 2 O 3 ⁇ 4, 5 ⁇ Al 2 O 3 ⁇ 15, 5 ⁇ CaO ⁇ 30, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 20, Contains the following ingredients.
  • the content of silicon dioxide (SiO 2 ) in glass composition A may be 55% by mass or more and 72% by mass or less.
  • the content of aluminum oxide (Al 2 O 3 ) may be 5% by mass or more and 14% by mass or less.
  • the content of calcium oxide (CaO) may be 5% by mass or more and 28% by mass or less.
  • the content of diboron trioxide (B 2 O 3 ) may be 0.1% by mass or more and 4% by mass or less.
  • Glass composition A may be a composition that does not substantially contain B 2 O 3 .
  • the total content of alkali metal oxides (Li 2 O+Na 2 O+K 2 O) may be 0.1% by mass or more and 20% by mass or less.
  • Glass composition A may be a composition substantially free of alkali metal oxides. Glass composition A does not need to contain substantially any components other than the above-mentioned components.
  • compositions A-1 to A-4 are illustrated as more specific glass compositions A.
  • Composition A-1 contains the following components in mass %. 50 ⁇ SiO 2 ⁇ 67, 0 ⁇ B 2 O 3 ⁇ 2, 5 ⁇ Al 2 O 3 ⁇ 15, 45 ⁇ (SiO 2 -Al 2 O 3 ) ⁇ 57, 1 ⁇ MgO ⁇ 10, 10 ⁇ CaO ⁇ 30, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 12 0 ⁇ T-Fe 2 O 3 ⁇ 5
  • the glass composition having glass composition A-1 has excellent heat resistance, suppresses deformation when heated to high temperatures, and has excellent chemical durability.
  • SiO2 is a component that forms the skeleton of glass and is the main component of composition A-1. Further, SiO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation, and is a component that improves acid resistance.
  • the content of SiO 2 is 50% by mass or more and 67% by mass or less, particularly 55% by mass or more and 65% by mass or less, but the lower limit of the content of SiO 2 can be 56% by mass or more, and 57% by mass or more. , 58% by mass or more, 59% by mass or more, or even more than 60% by mass.
  • the upper limit of the content of SiO 2 may be 64% by mass or less, or 63% by mass or less.
  • B 2 O 3 is a component that forms the skeleton of glass. Moreover, B 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation.
  • the lower limit of the content of B 2 O 3 may be 0.1% by mass or more.
  • the upper limit of the content of B 2 O 3 may be less than 2% by mass, 1.5% by mass or less, 1% by mass or less, or 0.5% by mass or less.
  • the upper limit of the content of B 2 O 3 may be 0.1% by mass or less.
  • Composition A-1 may be substantially free of B 2 O 3 .
  • Al 2O3 Al 2 O 3 is a component that forms the skeleton of glass. Furthermore, Al 2 O 3 is a component that adjusts the devitrification temperature and viscosity during glass formation, and is a component that improves the water resistance of the glass. Furthermore, Al 2 O 3 is a component that improves the Young's modulus and heat resistance of glass. On the other hand, excessive content of Al 2 O 3 lowers the acid resistance of the glass. When the Al 2 O 3 content is 5% by mass or more and 15% by mass or less, an increase in the devitrification temperature of the glass, which would make glass production difficult, is suppressed, and the acid resistance of the glass is increased.
  • the lower limit of the content of Al 2 O 3 may be 6% by mass or more, 7% by mass or more, 8% by mass or more, 8.5% by mass or more, 9% by mass or more, 9.5% by mass or more, 10% by mass % or more, 10.5% by mass or more, 11% by mass or more, and even 11.1% by mass or more.
  • the upper limit of the content of Al 2 O 3 may be 14% by mass or less, 13% by mass or less, 12.5% by mass or less, less than 12% by mass, or even 11.9% by mass or less.
  • the lower limit of the value obtained by subtracting the Al 2 O 3 content from the SiO 2 content (SiO 2 - Al 2 O 3 ) is 45% by mass or more, 47% by mass or more, It can be more than 48% by mass, more than 48.5% by mass, more than 49% by mass, and even more than 49.5% by mass.
  • the upper limit of (SiO 2 -Al 2 O 3 ) may be 57% by mass or less, 56% by mass or less, 55% by mass or less, 54% by mass or less, 53.5% by mass or less, 53% by mass or less, Furthermore, it may be 52% by mass or less.
  • the lower limit may be 45% by mass or more, 46% by mass or more, 47% by mass or more, more than 48% by mass, 48.5% by mass or more, more than 49% by mass, and even 49.5% by mass or more. It's possible.
  • the upper limit of (SiO 2 -B 2 O 3 -Al 2 O 3 ) may be 56% by mass or less, 55% by mass or less, 54% by mass or less, 53% by mass or less, 53.5% by mass or less, It may be 52% by mass or less, or even 51% by mass or less.
  • MgO, CaO are components that adjust the devitrification temperature and viscosity during glass formation. Moreover, MgO and CaO are also components that improve Young's modulus.
  • the content of MgO is 1% by mass or more and 10% by mass or less, but the lower limit can be 1.5% by mass or more, 1.8% by mass or more, or even 2% by mass or more.
  • the upper limit of the content of MgO may be 8% by mass or less, 6% by mass or less, 5% by mass or less, 4.5% by mass or less, or even 4% by mass or less.
  • the devitrification temperature and the viscosity at the time of melting of the glass should be in a range suitable for manufacturing a glass composition while suppressing an excessive increase in the devitrification temperature. I can do it.
  • the lower limit of the CaO content may be 15% by mass or more, 16% by mass or more, 17% by mass or more, 18% by mass or more, further 19% by mass or more, and in some cases 20% by mass or more.
  • the upper limit of the content of CaO may be 28% by mass or less, 27% by mass or less, 26% by mass or less, 25% by mass or less, or even 24% by mass or less.
  • (MgO+CaO) Regarding the meltability and moldability of glass, the value of the sum of the contents of MgO and CaO (MgO+CaO) is important. From the viewpoint of obtaining meltability and formability suitable for glass production, the lower limits of (MgO+CaO) are 8% by mass or more, 9% by mass or more, 9.5% by mass or more, 10% by mass or more, and 10.5% by mass.
  • % or more 11 mass% or more, 11.5 mass% or more, 12 mass% or more, 13 mass% or more, 13.5 mass% or more, 14 mass% or more, 14.5 mass% or more, 15 mass% or more, 16 It can be at least 17% by mass, at least 18% by mass, at least 19% by mass, at least 20% by mass, at least 21% by mass, and at least 22% by mass.
  • the upper limit of (MgO+CaO) is preferably 40% by mass or less, 35% by mass or less, 32% by mass or less, 30% by mass or less, 29% by mass or less, 28% by mass or less, 27% by mass or less, 26.5% by mass % or less, 26% by mass or less, 25% by mass or less, 24% by mass or less, or 23% by mass or less.
  • SrO Composition A-1 may further contain strontium oxide (SrO).
  • SrO is a component that adjusts the devitrification temperature and viscosity during glass formation.
  • excessive SrO content reduces the acid resistance of the glass.
  • the lower limit of the content of SrO may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, 5% by mass or more, It may be 6% by mass or more, 7% by mass or more, or even 8% by mass or more.
  • the upper limit of the content of SrO can be 15% by mass or less, 12% by mass or less, 10% by mass or less, 8% by mass or less, 6% by mass or less, 5% by mass or less, 4% by mass or less, 3% by mass or less , 2% by mass or less, 1.5% by mass or less, 1% by mass or less, and 0.5% by mass or less.
  • the upper limit of the SrO content may be 0.1% by mass or less.
  • Composition A-1 may be substantially free of SrO.
  • the value of the total content of MgO, CaO and SrO (MgO+CaO+SrO) is important.
  • the lower limit of (MgO + CaO + SrO) is preferably 15% by mass or more, 18% by mass or more, 20% by mass or more, 21% by mass or more, 22% by mass or more. , 23% by mass or more, 24% by mass or more, 25% by mass or more, 26% by mass or more, 27% by mass or more, and 28% by mass or more.
  • the upper limit of (MgO+CaO+SrO) is preferably 40% by mass or less, and may be 38% by mass or less, 36% by mass or less, 35% by mass or less, or 34% by mass or less.
  • Composition A-1 may further contain barium oxide (BaO).
  • BaO is a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, excessive BaO content reduces the acid resistance of the glass.
  • the upper limit of the BaO content may be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less. % by mass or less.
  • Composition A-1 may be substantially free of BaO.
  • the value of the total content of MgO, CaO, SrO and BaO is important.
  • the lower limit of (MgO+CaO+SrO+BaO) is preferably 15% by mass or more, 18% by mass or more, 20% by mass or more, 21% by mass or more, 22% by mass or more. , 23% by mass or more, 24% by mass or more, 25% by mass or more, 26% by mass or more, 27% by mass or more, and 28% by mass or more.
  • the upper limit of (MgO+CaO+SrO+BaO) is preferably 40% by mass or less, and may be 38% by mass or less, 36% by mass or less, 35% by mass or less, or 34% by mass or less.
  • composition A-1 may further contain zinc oxide (ZnO). Furthermore, when included in composition A-1, ZnO is a component that adjusts the devitrification temperature and viscosity during glass formation. However, since the raw material for ZnO is relatively expensive, the content thereof should be low. In composition A-1, the upper limit of the content of ZnO may be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, Furthermore, it may be 0.1% by mass or less. Composition A-1 may be substantially free of ZnO.
  • Alkali metal oxides (Li 2 O, Na 2 O, K 2 O) are components that adjust the devitrification temperature and viscosity during glass formation.
  • the value of the total content of alkali metal oxides (Li 2 O + Na 2 O + K 2 O) is 0% by mass or more and 4% by mass or less, the devitrification temperature and viscosity of the molten glass are reduced while suppressing an excessive increase in the devitrification temperature. can be in a range suitable for glass production. Further, while suppressing the increase in the melting point of the glass and achieving more uniform melting of the glass raw materials, high heat resistance of the glass can be ensured without excessively lowering the glass transition temperature.
  • the lower limit of (Li 2 O+Na 2 O+K 2 O) may be greater than 0% by mass, or may be greater than or equal to 0.1% by mass.
  • the upper limit of (Li 2 O+Na 2 O+K 2 O) may be 3% by mass or less, 2% by mass or less, and less than 2% by mass.
  • the value of (Li 2 O+Na 2 O+K 2 O) may be 0.1% by mass or less.
  • Composition A-1 may be substantially free of alkali metal oxides.
  • Each of Li 2 O, Na 2 O, and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be zero.
  • the lower limit of the content of lithium oxide (Li 2 O) may be 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, and even 0.4% by mass or more.
  • the upper limit of the content of Li 2 O may be 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, and even 1% by mass or less.
  • the lower limit of the content of sodium oxide (Na 2 O) may be 0.1% by mass or more, or 0.2% by mass or more.
  • the upper limit of the content of Na 2 O may be 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, or even 1% by mass or less.
  • the lower limit of the potassium oxide (K 2 O) content may be 0.1% by mass or more, or 0.2% by mass or more.
  • the upper limit of the content of K 2 O may be 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, or even 1% by mass or less.
  • Composition A-1 may further contain titanium dioxide (TiO 2 ).
  • TiO 2 is a component that improves the meltability and chemical durability of glass, and improves the ultraviolet absorption characteristics of glass. Furthermore, TiO 2 is a component that improves the acid resistance and water resistance of glass. However, since the raw material for TiO 2 is relatively expensive, the content thereof should be lower. The lower limit of the content of TiO 2 may be 0.1% by mass or more. The upper limit of the content of TiO 2 can be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.3% by mass or less, and even 0. It may be 2% by mass or less. Composition A-1 may be substantially free of TiO 2 .
  • ZrO2 Composition A-1 may further contain zirconium oxide (ZrO 2 ).
  • ZrO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation. Furthermore, ZrO 2 is a component that improves the acid resistance and alkali resistance of glass. Furthermore, ZrO 2 is a component that improves the Young's modulus and heat resistance of glass. However, since the raw material for ZrO 2 is relatively expensive, the content thereof should be lower.
  • the upper limit of the content of ZrO 2 may be 7% by mass or less, 6% by mass or less, 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, 1% by mass or less, 0.5 It may be less than 0.1% by mass, and even less than 0.1% by mass.
  • Composition A-1 may be substantially free of ZrO 2 .
  • Composition A-1 may further contain diiron trioxide (Fe 2 O 3 ).
  • Iron (Fe) usually exists in the Fe 2+ or Fe 3+ state.
  • Fe 3+ is a component that enhances the ultraviolet absorption properties of glass
  • Fe 2+ is a component that enhances heat ray absorption properties of glass. Even if Fe is not intentionally included, it may be unavoidably mixed in with industrial raw materials. If the content of Fe is small, coloring of the glass can be prevented.
  • the upper limit of the content of Fe expressed by T-Fe 2 O 3 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3 mass% or less, 0.2 mass% or less, further 0.1 mass% or less, less than 0.1 mass%, 0.08 mass% or less, 0.05 mass% or less, 0.04 mass% or less , and even 0.03% by mass or less.
  • the lower limit of the content of Fe expressed by T-Fe 2 O 3 may be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, and further 0.2% by mass or more. Particularly in glass compositions with a low content of alkali metal oxides, trace amounts of iron oxide can contribute to promoting glass fining.
  • Composition A-1 may further contain fluorine (F 2 ) and chlorine (Cl 2 ). Since F 2 easily volatizes, there is a possibility of it scattering during melting, and there is also the problem that it is difficult to control the content in the glass.
  • the upper limit of the content of F2 can be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.2% by mass or less, and even 0.1% by mass or less. It's possible.
  • Composition A-1 may be substantially free of F 2 .
  • Composition A-1 may be substantially free of Cl 2 .
  • Composition A-1 may have a preferred composition described in mass % in the following paragraphs.
  • composition containing the following components and substantially free of alkali metal oxides.
  • composition containing the following ingredients 55 ⁇ SiO 2 ⁇ 67, 0.1 ⁇ B 2 O 3 ⁇ 2, 5 ⁇ Al 2 O 3 ⁇ 15, 45 ⁇ (SiO 2 -Al 2 O 3 ) ⁇ 57, 1 ⁇ MgO ⁇ 10, 15 ⁇ CaO ⁇ 30, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 4, 0 ⁇ T-Fe 2 O 3 ⁇ 5, A composition containing the following ingredients.
  • composition containing the following ingredients 50 ⁇ SiO 2 ⁇ 67, 0 ⁇ B 2 O 3 ⁇ 2, 5 ⁇ Al 2 O 3 ⁇ 15, 45 ⁇ (SiO 2 -Al 2 O 3 ) ⁇ 57, 1 ⁇ MgO ⁇ 10, 10 ⁇ CaO ⁇ 30, 1 ⁇ SrO ⁇ 15, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 4, 0 ⁇ T-Fe 2 O 3 ⁇ 5, A composition containing the following ingredients.
  • compositions (excluding compositions where 0.1 ⁇ B 2 O 3 ⁇ 2) does not substantially contain B 2 O 3 .
  • Composition A-2 contains the following components in mass %. 65 ⁇ SiO2 ⁇ 75, 0 ⁇ B 2 O 3 ⁇ 2, 5 ⁇ Al 2 O 3 ⁇ 15, 50 ⁇ (SiO 2 -Al 2 O 3 ) ⁇ 60, 1 ⁇ MgO ⁇ 10, 10 ⁇ CaO ⁇ 25, 0 ⁇ ( Li2O + Na2O + K2O ) ⁇ 4, 0 ⁇ T-Fe 2 O 3 ⁇ 5
  • the glass fiber having the glass composition A-2 has excellent heat resistance, suppresses deformation when heated to high temperatures, and has excellent chemical durability, particularly acid resistance.
  • SiO2 SiO 2 is also the main component in composition A-2.
  • the content of SiO 2 is greater than 65% by mass and not more than 75% by mass, but the lower limit may be 66% by mass or more.
  • the upper limit of the content of SiO 2 may be 72% by mass or less, 70% by mass or less, 69% by mass or less, 68% by mass or less, or even 67% by mass or less.
  • composition A-2 the content of B 2 O 3 and Al 2 O 3 can have the same upper and lower limits as composition A-1.
  • the lower limit of the value obtained by subtracting the Al 2 O 3 content from the SiO 2 content (SiO 2 -Al 2 O 3 ) is more than 50% by mass. It can be 51% by mass or more, 52% by mass or more, or even more than 53% by mass. Further, the upper limit of (SiO 2 -Al 2 O 3 ) may be 60% by mass or less, 59% by mass or less, 58% by mass or less, and further 57% by mass or less.
  • composition A-2 the MgO content may have the same upper and lower limits as composition A-1.
  • the content of CaO is 10% by mass or more and 25% by mass or less.
  • the lower limit of the CaO content may be 12% by mass or more, 13% by mass or more, 14% by mass or more, and even more than 15% by mass.
  • the upper limit of the CaO content may be 23% by mass or less, 22% by mass or less, 21% by mass or less, or even 20% by mass or less.
  • composition A-2 may further contain SrO.
  • the upper limit of the content of SrO can be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less , and even less than 0.1% by mass.
  • Composition A-2 may be substantially free of SrO.
  • Composition A-2 may further contain BaO.
  • the content of BaO may have the same upper and lower limits as in composition A-1.
  • Composition A-2 may be substantially free of BaO.
  • composition A-2 may further contain ZnO.
  • the ZnO content may have the same upper and lower limits as composition A-1.
  • Composition A-2 may be substantially free of ZnO.
  • composition A-2 the total content of alkali metal oxides (Li 2 O+Na 2 O+K 2 O) is 0% by mass or more and 4% by mass or less.
  • the lower limit of (Li 2 O+Na 2 O+K 2 O) may be 0.1% by mass or more, 1% by mass or more, 1.5% by mass or more, or even 2% by mass or more.
  • the upper limit of (Li 2 O+Na 2 O+K 2 O) may be 3.5% by mass or less, or 3% by mass or less.
  • Composition A-2 may be substantially free of alkali metal oxides.
  • Each of Li 2 O, Na 2 O, and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be zero.
  • composition A-2 Li 2 O makes a particularly high contribution to the effect based on the alkali metal oxide described above.
  • the lower limit of the content of Li 2 O in composition A-2 may be 0.1% by mass or more, 0.5% by mass or more, or even 1% by mass or more.
  • the upper limit of the content of Li 2 O may be 4% by mass or less, 3% by mass or less, 2.5% by mass or less, or 2% by mass or less.
  • composition A-2 the contents of Na 2 O and K 2 O can have the same upper and lower limits as composition A-1.
  • Composition A-2 may further contain TiO 2 .
  • the content of TiO 2 can have the same upper and lower limits as in composition A-1.
  • Composition A-2 may be substantially free of TiO 2 .
  • composition A-2 may further contain ZrO 2 .
  • the content of ZrO 2 can have the same upper and lower limits as composition A-1.
  • Composition A-2 may be substantially free of ZrO 2 .
  • composition A-2 may further contain each of the above components.
  • the preferred contents and other details of each of these components are the same as those for composition A-1, so their description will be omitted.
  • Composition A-3 contains the following components expressed in mass %. 60 ⁇ SiO 2 ⁇ 75, 0 ⁇ B 2 O 3 ⁇ 4, 5 ⁇ Al 2 O 3 ⁇ 15, 47 ⁇ (SiO 2 -Al 2 O 3 ) ⁇ 60, 1 ⁇ MgO ⁇ 10, 10 ⁇ CaO ⁇ 25, 4 ⁇ ( Li2O + Na2O + K2O ) ⁇ 9 0 ⁇ T-Fe 2 O 3 ⁇ 5
  • the glass fiber having the glass composition A-3 has excellent heat resistance, suppresses deformation when heated to high temperatures, and has excellent chemical durability, particularly acid resistance.
  • SiO2 SiO 2 is also the main component in composition A-3.
  • the content of SiO 2 is 60% by mass or more and 75% by mass or less, but the lower limit can be 62% by mass or more, 63% by mass or more, 64% by mass or more, and even more than 65% by mass. sell.
  • the upper limit of the content of SiO 2 may be 72% by mass or less, 70% by mass or less, 69% by mass or less, 68% by mass or less, or even 67% by mass or less.
  • B 2 O 3 is a component that forms the skeleton of glass. Moreover, B 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation.
  • the lower limit of the content of B 2 O 3 may be 0.1% by mass or more.
  • the upper limit of the content of B 2 O 3 may be 4% by mass or less, 3% by mass or less, less than 2% by mass, 1.5% by mass or less, 1% by mass or less, or 0.5% by mass or less. .
  • the upper limit of the content of B 2 O 3 may be 0.1% by mass or less.
  • Composition A-1 may be substantially free of B 2 O 3 .
  • composition A-3 the content of Al 2 O 3 can have the same upper and lower limits as composition A-1.
  • the lower limit of the value obtained by subtracting the content of Al 2 O 3 from the content of SiO 2 (SiO 2 -Al 2 O 3 ) is 47% by mass or more, It can be more than 49% by weight, more than 50% by weight, more than 51% by weight, more than 52% by weight, and even more than 53% by weight.
  • the upper limit of (SiO 2 -Al 2 O 3 ) may be 60% by mass or less, 59% by mass or less, 58% by mass or less, and even 57% by mass or less.
  • composition A-3 the MgO content can have the same upper and lower limits as composition A-1.
  • the content of CaO is 10% by mass or more and 25% by mass or less.
  • the lower limit of the CaO content may be 12% by mass or more, 13% by mass or more, 14% by mass or more, and even more than 15% by mass.
  • the upper limit of the content of CaO may be 23% by mass or less, 21% by mass or less, 20% by mass or less, 19% by mass or less, or even 18% by mass or less.
  • the sum of the contents of MgO and CaO can be set to 11% by mass or more and 35% by mass or less.
  • the total content of alkali metal oxides and the total content of MgO and CaO are in appropriate ranges, so that the devitrification temperature of the glass can be suppressed while suppressing an excessive rise in the devitrification temperature.
  • the temperature and viscosity at the time of melting can be set within a range suitable for producing a glass composition. Moreover, high acid resistance of the glass can be ensured.
  • the lower limit of (MgO+CaO) may be 13% by mass or more, more than 14% by mass, 15% by mass or more, 16% by mass or more, and even more than 17% by mass.
  • the upper limit of (MgO+CaO) may be 30% by mass or less, 28% by mass or less, 26% by mass or less, 25% by mass or less, or even 24% by mass or less.
  • composition A-3 may further contain SrO.
  • the SrO content can have the same upper and lower limits as composition A-2.
  • Composition A-3 may be substantially free of SrO.
  • Composition A-3 may further contain BaO.
  • the content of BaO may have the same upper and lower limits as in composition A-1.
  • Composition A-3 may be substantially free of BaO.
  • composition A-3 may further contain ZnO.
  • the ZnO content can have the same upper and lower limits as composition A-1.
  • Composition A-3 may be substantially free of ZnO.
  • the total content of alkali metal oxides is greater than 4% by mass and less than 9% by mass.
  • the lower limit of (Li 2 O+Na 2 O+K 2 O) may be 4.5% by mass or more, or 5% by mass or more.
  • the upper limit of (Li 2 O+Na 2 O+K 2 O) may be 8.5% by mass or less, 8% by mass or less, 7.5% by mass or less, and further 7% by mass or less.
  • Each of Li 2 O, Na 2 O, and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be zero.
  • composition A-3 Li 2 O makes a particularly high contribution to the effect based on the alkali metal oxide described above.
  • the lower limit of the Li 2 O content in composition A-3 may be 0.1% by mass or more, 0.5% by mass or more, or even 1% by mass or more.
  • the upper limit of the content of Li 2 O may be 3% by mass or less, or 2% by mass or less.
  • the lower limit of the content of Na 2 O may be 0.1% by mass or more, 0.2% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.5% by mass. In addition to the above, the content may be 2% by mass or more.
  • the upper limit of the content of Na 2 O may be 8% by mass or less, 7% by mass or less, and further 6% by mass or less.
  • the lower limit of the content of K 2 O may be 0.1% by mass or more, 0.2% by mass or more, or 0.3% by mass or more.
  • the upper limit of the content of K 2 O may be 3% by mass or less, 2% by mass or less, and even 1% by mass or less.
  • Composition A-3 may further contain TiO 2 .
  • the content of TiO 2 can have the same upper and lower limits as in composition A-1.
  • Composition A-3 may be substantially free of TiO 2 .
  • composition A-3 may further contain ZrO 2 .
  • the content of ZrO 2 can have the same upper and lower limits as composition A-1.
  • Composition A-3 may be substantially free of ZrO 2 .
  • composition A-3 may further contain each of the above components.
  • the preferred contents and other details of each of these components are the same as those for composition A-1, so their description will be omitted.
  • Composition A-4 contains the following components expressed in mass %. 60 ⁇ SiO 2 ⁇ 75, 0 ⁇ B 2 O 3 ⁇ 4, 5 ⁇ Al 2 O 3 ⁇ 15, 47 ⁇ (SiO 2 -Al 2 O 3 ) ⁇ 60, 5 ⁇ CaO ⁇ 20, 6 ⁇ Na 2 O ⁇ 20, 9 ⁇ ( Li2O + Na2O + K2O ) ⁇ 20 0 ⁇ T-Fe 2 O 3 ⁇ 5
  • the glass composition having glass composition A-4 further has excellent heat resistance and chemical durability.
  • composition A-4 Each component in glass composition A-4 will be explained below. However, regarding the role of each component, descriptions that overlap with the glass compositions A-1 to A-3 will be omitted.
  • SiO2 SiO 2 is also the main component in composition A-4. In composition A-4, the content of SiO 2 can have the same upper and lower limits as composition A-3.
  • composition A-4 the content of B 2 O 3 can have the same upper and lower limits as composition A-3.
  • composition A-4 the content of Al 2 O 3 can have the same upper and lower limits as composition A-1.
  • composition A-4 from the viewpoint of improving the acid resistance of the glass, the value obtained by subtracting the content of Al 2 O 3 from the content of SiO 2 (SiO 2 -Al 2 O 3 ) is the same as that of composition A-3. It can have an upper limit and a lower limit.
  • composition A-4 may further contain MgO.
  • MgO MgO, CaO
  • the lower limit of the content of MgO may be 0% by mass or more, 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, or even 2% by mass or more.
  • the upper limit of the content of MgO may be 10% by mass or less, 8% by mass or less, 6% by mass or less, 5% by mass or less, and even 4% by mass or less.
  • the content of CaO is 5% by mass or more and 20% by mass or less.
  • the lower limit of the content of CaO may be 6% by mass or more, 7% by mass or more, 8% by mass or more, 9% by mass or more, or even 10% by mass or more.
  • the upper limit of the content of CaO may be 18% by mass or less, 17% by mass or less, 16% by mass or less, and even 15% by mass or less.
  • composition A-4 when the ease of molding of the glass composition is important, the sum of the contents of MgO and CaO (MgO+CaO) can be set to 5% by mass or more and 30% by mass or less.
  • the sum of the content of alkali metal oxides and the sum of the contents of MgO and CaO is in an appropriate range, so that the devitrification temperature of the glass can be suppressed while suppressing an excessive rise in the devitrification temperature.
  • the temperature and viscosity at the time of melting can be set within a range suitable for producing a glass composition. Moreover, high acid resistance of the glass can be ensured.
  • the lower limit of (MgO+CaO) may be 6% by mass or more, 8% by mass or more, 9% by mass or more, 10% by mass or more, 11% by mass or more, 12% by mass or more, and even 13% by mass or more.
  • the upper limit of (MgO+CaO) may be 26% by mass or less, 23% by mass or less, 22% by mass or less, 21% by mass or less, 20% by mass or less, 19% by mass or less, or even 18% by mass or less.
  • composition A-4 may further contain SrO.
  • the SrO content can have the same upper and lower limits as composition A-2.
  • Composition A-4 may be substantially free of SrO.
  • Composition A-4 may further contain BaO.
  • the BaO content may have the same upper and lower limits as composition A-1.
  • Composition A-4 may be substantially free of BaO.
  • composition A-4 may further contain ZnO.
  • the ZnO content can have the same upper and lower limits as composition A-1.
  • Composition A-4 may be substantially free of ZnO.
  • the total content of alkali metal oxides (Li 2 O, Na 2 O, K 2 O) is 9% by mass or more and 20% by mass or less.
  • the lower limit of (Li 2 O+Na 2 O+K 2 O) may be 9.5% by mass or more, or may be 10% by mass or more.
  • the upper limit of (Li 2 O + Na 2 O + K 2 O) can be 18% by mass or less, 16% by mass or less, less than 15% by mass, 14% by mass or less, 13% by mass or less, 12.5% by mass or less, 12% by mass % or less.
  • Each of Li 2 O and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be 0 as long as the total content of alkali metal oxides is 9% by mass or more.
  • Li 2 O makes a particularly high contribution to the effect based on the alkali metal oxide described above.
  • the inclusion of Li 2 O can lower the working temperature of the glass substrate when forming the glass composition, and when the working temperature is lowered, the glass composition becomes easier to form, and its productivity improves.
  • excessive inclusion of Li 2 O lowers the glass transition temperature and reduces the heat resistance of the glass.
  • the lower limit of the content of Li 2 O in composition A-4 may be 0% by mass or more, 0.1% by mass or more, 0.5% by mass or more, or even 1% by mass or more.
  • the upper limit of the content of Li 2 O may be 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, or even less than 2% by mass.
  • the content of Na 2 O is 6% by mass or more and 20% by mass or less. When the content of Na 2 O is within these ranges, the effect based on the alkali metal oxide described above becomes more reliable.
  • the lower limit of the content of Na 2 O may be 7% by mass or more, and further may be 8% by mass or more.
  • the upper limit of the content of Na 2 O may be 17% by mass or less, 16% by mass or less, less than 15% by mass, 14% by mass or less, 13% by mass or less, and even 12% by mass or less.
  • the lower limit of the content of K 2 O may be 0% by mass or more, 0.1% by mass or more, or even 0.5% by mass or more.
  • the upper limit of the content of K 2 O may be 5% by mass or less, 3% by mass or less, 2% by mass or less, less than 2% by mass, or even 1% by mass or less.
  • Composition A-4 may further contain TiO 2 .
  • the content of TiO 2 can have the same upper and lower limits as in composition A-1.
  • Composition A-4 may be substantially free of TiO 2 .
  • composition A-4 may further contain ZrO 2 .
  • the content of ZrO 2 can have the same upper and lower limits as composition A-1.
  • Composition A-4 may be substantially free of ZrO 2 .
  • composition A-4 may further contain each of the above components.
  • the preferred contents and other details of each of these components are the same as those for composition A-1, so their description will be omitted.
  • Glass composition B In addition, another example of the glass composition (hereinafter referred to as glass composition B) is expressed in mass%, 50 ⁇ SiO 2 ⁇ 75, 0 ⁇ B 2 O 3 ⁇ 4, 0.1 ⁇ (MgO+CaO) ⁇ 20, 9 ⁇ ( Li2O + Na2O + K2O ) ⁇ 20, 5 ⁇ ZrO 2 ⁇ 20, Contains the following ingredients.
  • Glass composition B does not need to contain substantially any components other than the above-mentioned components. Moreover, the glass composition B can be a glass fiber with high chemical durability.
  • SiO2 is a component that forms the skeleton of glass and is the main component of composition B. Further, SiO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation. A component that improves water resistance and acid resistance.
  • the content of SiO 2 is 50% by mass or more and 75% by mass or less, but the lower limit of the content of SiO 2 can be 52% by mass or more, 54% by mass or more, 56% by mass or more, 58% by mass or more. , 60% by mass or more, 62% by mass or more, 63% by mass or more, 64% by mass or more, more than 65% by mass, or even more than 66% by mass.
  • the upper limit of the content of SiO 2 may be 74% by mass or less, 73% by mass or less, 71% by mass or less, or even 70% by mass or less.
  • Composition B may further contain B 2 O 3 .
  • B 2 O 3 is a component that forms the skeleton of glass.
  • B 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation.
  • excessive content of B 2 O 3 lowers the acid resistance of the glass.
  • the upper limit of the content of B 2 O 3 may be 4% by mass or less, 3% by mass or less, less than 2% by mass, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even It may be 0.1% by mass or less.
  • Composition B may be substantially free of B 2 O 3 .
  • Composition B may further contain Al 2 O 3 .
  • Al 2 O 3 is a component that forms the skeleton of glass.
  • Al 2 O 3 is a component that adjusts the devitrification temperature and viscosity during glass formation, and is a component that improves the water resistance of the glass.
  • excessive content of Al 2 O 3 lowers the acid resistance of the glass.
  • the upper limit of the content of Al 2 O 3 may be 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, or even 1.5% by mass or less.
  • composition B when ease of forming the glass and acid resistance are important, the sum of the contents of B 2 O 3 and Al 2 O 3 (B 2 O 3 +Al 2 O 3 ) may be important.
  • composition B (B 2 O 3 +Al 2 O 3 ) may be 5% by mass or less.
  • an increase in the devitrification temperature of the glass, which would make it difficult to manufacture the glass, is suppressed, and the acid resistance of the glass is increased.
  • the melting point of the glass does not become excessively high, and the uniformity of melting the raw materials increases.
  • the upper limit of (B 2 O 3 +Al 2 O 3 ) may be 4% by mass or less, 3% by mass or less, 2% by mass or less, or even less than 1.5% by mass.
  • Composition B may further contain MgO.
  • MgO is a component that adjusts the devitrification temperature and viscosity during glass formation.
  • MgO is also a component that adjusts the acid resistance and water resistance of the glass composition.
  • the lower limit of the MgO content may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, or even more than 2% by mass.
  • the upper limit of the content of MgO may be 15% by mass or less, 12% by mass or less, 10% by mass or less, 8% by mass or less, 6% by mass or less, or even 5% by mass or less.
  • Composition B may further contain CaO.
  • CaO is a component that adjusts the devitrification temperature and viscosity during glass formation.
  • CaO is also a component that adjusts the acid resistance and water resistance of the glass composition.
  • the lower limit of the CaO content may be 0.1% by mass or more, 1% by mass or more, 2% by mass or more, or even more than 3% by mass.
  • the upper limit of the CaO content may be 15% by mass or less, 12% by mass or less, 10% by mass or less, or even 8% by mass or less.
  • composition B when the value of the sum of the contents of MgO and CaO (MgO+CaO) is 0.1% by mass or more and 20% by mass or less, the devitrification temperature and viscosity of the molten glass can be controlled while suppressing an excessive increase in the devitrification temperature. , the range suitable for glass production. Further, within this range, it is also possible to improve the chemical durability of the glass.
  • the lower limit of (MgO+CaO) may be 2% by mass or more, 4% by mass or more, 6% by mass or more, 8% by mass or more, or even 9% by mass or more.
  • the upper limit of (MgO+CaO) may be 20% by mass or less, 18% by mass or less, 16% by mass or less, 14% by mass or less, or even 13% by mass or less.
  • each of MgO and CaO is an optional component.
  • the lower limit of the content of these components may be 0 as long as the total content is 0.1% by mass or more.
  • Composition B may further contain SrO.
  • SrO is a component that adjusts the devitrification temperature and viscosity during glass formation.
  • excessive SrO content reduces the acid resistance of the glass.
  • the upper limit of the SrO content can be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less. % by mass or less.
  • Composition B may be substantially free of SrO.
  • Composition B may further contain BaO.
  • BaO is a component that adjusts the devitrification temperature and viscosity during glass formation.
  • excessive BaO content reduces the acid resistance of the glass.
  • the upper limit of the BaO content may be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less. % by mass or less.
  • Composition B may be substantially free of BaO.
  • composition B may further contain ZnO.
  • ZnO is a component that adjusts the devitrification temperature and viscosity during glass formation.
  • ZnO is easily volatilized and may scatter during melting, excessive ZnO content causes significant fluctuations in the glass component ratio due to volatilization, making it difficult to manage the glass composition.
  • the raw material for ZnO is relatively expensive, the content thereof should be low.
  • the upper limit of the content of ZnO may be 10% by mass or less, 5% by mass or less, less than 3% by mass, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, Furthermore, it may be 0.1% by mass or less.
  • Composition B may be substantially free of ZnO.
  • Alkali metal oxides (Li 2 O, Na 2 O, K 2 O) are components in composition B that adjust the devitrification temperature and viscosity during glass formation. Further, the alkali metal oxides (Li 2 O, Na 2 O, K 2 O) are also components that adjust the acid resistance and water resistance of the glass. Li 2 O and K 2 O are each optional components. In other words, the lower limit of the content of each of these components may be zero.
  • the lower limit of the content of Li 2 O may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, or 1.5% by mass or more.
  • the upper limit of the content of Li 2 O may be 5% by mass or less, 4% by mass or less, 3.5% by mass or less, or even 3% by mass or less.
  • the lower limit of the content of Na 2 O may be 0.1% by mass or more, 1% by mass or more, or 3% by mass or more.
  • the content of Na 2 O may be 6% by mass or more and 20% by mass or less.
  • the devitrification temperature and viscosity of the molten glass can be controlled to be within a range suitable for glass production while suppressing an excessive increase in the devitrification temperature. Further, while suppressing the increase in the melting point of the glass and achieving more uniform melting of the glass raw materials, high heat resistance of the glass can be ensured without excessively lowering the glass transition temperature. Furthermore, within this range, it is also possible to improve the chemical durability of the glass.
  • the lower limit of Na 2 O may be 7% by mass or more, 7.5% by mass or more, or even 8% by mass or more.
  • the upper limit of Na 2 O may be 18% by mass or less, 16% by mass or less, 15% by mass or less, 14% by mass or less, 13% by mass or less, or even 12% by mass or less.
  • the lower limit of the content of K 2 O may be 0.1% by mass or more, and may be greater than 0.5% by mass.
  • the upper limit of the content of K 2 O may be 10% by mass or less, 5% by mass or less, less than 4% by mass, 3% by mass or less, and even less than 2% by mass.
  • composition B when the total content of alkali metal oxides (Li 2 O + Na 2 O + K 2 O) is 9% by mass or more and 20% by mass or less, the devitrification temperature is suppressed and the molten glass is not devitrified excessively.
  • the transmission temperature and viscosity can be set in a range suitable for glass production. Further, while suppressing the increase in the melting point of the glass and achieving more uniform melting of the glass raw materials, high heat resistance of the glass can be ensured without excessively lowering the glass transition temperature. Furthermore, within this range, it is also possible to improve the chemical durability of the glass.
  • the lower limit of (Li 2 O+Na 2 O+K 2 O) may be 9.5% by mass or more, or may be 10% by mass or more.
  • the upper limit of (Li 2 O + Na 2 O + K 2 O) may be 18% by mass or less, 16% by mass or less, 15% by mass or less, 14% by mass or less, less than 13% by mass, or even less than 12% by mass.
  • Each of Li 2 O, Na 2 O and K 2 O is an optional component.
  • the lower limit of the content of each of these components may be 0 as long as the total content of alkali metal oxides is 9% by mass or more.
  • composition B may further contain TiO2 .
  • TiO 2 is a component that improves the meltability and chemical durability of glass. However, since the raw material for TiO 2 is relatively expensive, the content thereof should be lower. The upper limit of the content of TiO 2 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less.
  • Composition B may be substantially free of TiO2 .
  • ZrO2 ZrO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation.
  • ZrO 2 is also a component that adjusts the acid resistance and water resistance of the glass composition.
  • ZrO 2 is also a component that improves Young's modulus.
  • the content of ZrO 2 in composition B is 5% by mass or more and 20% by mass or less, an increase in the devitrification temperature of the glass, which would make it difficult to manufacture the glass, is suppressed, and the water resistance and acid resistance of the glass are increased.
  • the raw material for ZrO 2 is relatively expensive, the content thereof should be lower.
  • the lower limit of the content of ZrO 2 is greater than 5% by mass, and may be 5.5% by mass or more, 6% by mass or more, 6.5% by mass or more, or even 7% by mass or more.
  • the upper limit of the content of ZrO 2 can be 18% by mass or less, 15% by mass or less, 12% by mass or less, 10% by mass or less, 9.5% by mass or less, 9% by mass or less, 8.5% by mass or less , or even 8% by mass or less.
  • Fe Iron (Fe) contained in the glass composition usually exists in the form of Fe 2+ or Fe 3+ .
  • Fe 3+ is a component that enhances the ultraviolet absorption properties of the glass composition
  • Fe 2+ is a component that enhances the heat ray absorption properties of the glass composition. Even if Fe is not intentionally included, it may be unavoidably mixed in with industrial raw materials. If the content of Fe is small, coloring of the glass composition can be prevented.
  • the upper limit of the content of Fe expressed by T-Fe 2 O 3 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3 mass% or less, 0.2 mass% or less, further 0.1 mass% or less, less than 0.1 mass%, 0.08 mass% or less, 0.05 mass% or less, 0.04 mass% or less , and even 0.03% by mass or less.
  • the lower limit of the content of Fe expressed by T-Fe 2 O 3 may be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, and further 0.2% by mass or more. Particularly in glass compositions with a low content of alkali metal oxides, trace amounts of iron oxide can contribute to promoting glass fining.
  • Composition B may further contain fluorine (F 2 ) and chlorine (Cl 2 ). Since F 2 easily volatizes, there is a possibility of it scattering during melting, and there is also the problem that it is difficult to control the content in the glass.
  • the upper limit of the content of F2 can be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.2% by mass or less, and even 0.1% by mass or less. It's possible.
  • F 2 may be substantially absent.
  • Cl 2 Since Cl 2 easily volatizes, there is a possibility of it scattering during melting, and there is also the problem that it is difficult to control the content in the glass.
  • the upper limit of the content of Cl 2 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.2% by mass or less, and even 0.1% by mass or less. It's possible. Cl 2 may be substantially free.
  • Glass composition A and glass composition B may further contain the following components as long as the effects of the present invention can be obtained.
  • Glass composition A and glass composition B include P 2 O 5 , Sc 2 O 3 , Y 2 O 3 , La 2 O 3 , CeO 2 , Pr 2 O 3 , Nd 2 O 3 , Pm 2 O as other components.
  • the total allowable content of these components may be 5% by weight or less, less than 2% by weight, less than 1% by weight, less than 0.5% by weight, or even less than 0.1% by weight. .
  • the other components mentioned above may not be substantially contained.
  • oxides of litanoid La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu
  • La europoride
  • Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy Ho, Er, Tm, Yb, Lu
  • Glass composition A and glass composition B each contain at least one kind selected from SO 3 , Br 2 , I 2 , SnO 2 , As 2 O 3 and Sb 2 O 3 as an additive in an amount of 0% by mass or more and 1% by mass. It can be contained in a content of % by mass or less.
  • the permissible content of these components can be less than 0.5% by weight, less than 0.2% by weight, or even less than 0.1% by weight for each.
  • the total allowable content of these components may be 1% by weight or less, less than 0.5% by weight, less than 0.2% by weight, or even less than 0.1% by weight.
  • the other components mentioned above may not be substantially contained.
  • Glass composition A and glass composition B each contain H 2 O, OH, H 2 , CO 2 , CO, He, Ne, Ar, and N 2 at a content of 0% by mass or more and 0.1% by mass or less. sell.
  • the permissible content of these components can be less than 0.05% by weight, less than 0.03% by weight, or even less than 0.01% by weight for each.
  • the total allowable content of these components can be 0.1% by weight or less, less than 0.05% by weight, less than 0.03% by weight, and even less than 0.01% by weight.
  • the other components mentioned above may not be substantially contained.
  • Glass composition A and glass composition B may contain trace amounts of noble metal elements.
  • noble metal elements such as Pt, Rh, Au, and Os can be included at a content of 0% by mass or more and 0.1% by mass or less, respectively.
  • the permissible content of these components may be less than 0.1% by weight each, less than 0.05% by weight, less than 0.03% by weight, or even less than 0.01% by weight.
  • the total allowable content of these components can be 0.1% by weight or less, less than 0.05% by weight, less than 0.03% by weight, and even less than 0.01% by weight.
  • the other components mentioned above may not be substantially contained.
  • Glass composition A and glass composition B may be compositions that do not substantially contain CuO. Moreover, the glass composition A and the glass composition B may be compositions that do not substantially contain CoO. Furthermore, glass composition A and glass composition B may be compositions that do not substantially contain PbO. Moreover, the glass composition A and the glass composition B may be compositions that do not substantially contain NiO.
  • the characteristics that the glass of the present invention can have will be explained below.
  • the temperature at which the viscosity of the molten glass becomes 1000 dPa ⁇ sec (1000 poise) is called the working temperature of the glass, and is the most suitable temperature for forming the glass.
  • the working temperature is 1100° C. or higher, variations in glass fiber diameter can be reduced. If the working temperature is 1300° C. or lower, the fuel cost for melting glass can be reduced, the glass manufacturing equipment will be less susceptible to corrosion due to heat, and the life of the equipment will be extended.
  • the lower limit of the working temperature may be 1100°C or higher, 1120°C or higher, 1140°C or higher, 1150°C or higher, 1160°C or higher, 1170°C or higher, 1180°C or higher, or even 1200°C or higher.
  • the upper limit of the working temperature may be 1300°C or less, 1280°C or less, 1270°C or less, 1260°C or less, or even 1250°C or less.
  • ⁇ T of glass composition A may be 0°C or higher, 10°C or higher, 20°C or higher, 30°C or higher, 40°C or higher, or even 50°C or higher.
  • ⁇ T is 200° C. or less, the glass composition can be easily adjusted.
  • ⁇ T of glass composition A may be 200°C or less, 180°C or less, or even 160°C or less.
  • Young's modulus The higher the Young's modulus of the glass composition forming the glass fiber, the better the elasticity of the glass fiber, and the better the mechanical properties of a heat insulating material or a sound absorbing material made of the glass fiber.
  • the Young's modulus GPa
  • the lower limit of Young's modulus may be 77 GPa or more, 78 GPa or more, 79 GPa or more, or even 80 GPa or more.
  • the upper limit of Young's modulus may preferably be 100 GPa or less, 99 GPa or less, 98 GPa or less, 97 GPa or less, 96 GPa or less, or even 95 GPa or less.
  • Glass-transition temperature The higher the glass transition temperature (Tg) of a glass composition, the higher its heat resistance, and the less likely it is to be deformed by processing that involves high-temperature heating. If the glass transition temperature is 560° C. or higher, there is little risk that the shape of the glass wool will change in the event of a fire or the like. With the glass composition defined in this embodiment, a glass having a glass transition temperature of 560° C. or higher can be easily obtained.
  • the glass transition temperature of the glass composition is preferably 560°C or higher, more preferably 570°C or higher, and even more preferably 580°C or higher.
  • the glass transition temperature may be 600°C or higher, 620°C or higher, 650°C or higher, 680°C or higher, 700°C or higher, 720°C or higher, and in some cases 740°C or higher.
  • the upper limit of the glass transition temperature is preferably about 800°C, more preferably 780°C or less.
  • Acid resistance and water resistance are appropriate indicators of chemical durability in heat insulation and/or sound absorbing material applications.
  • the mass reduction rate ⁇ W 1 described later is employed, and the smaller this ⁇ W 1 is, the higher the acid resistance is.
  • the mass reduction rate ⁇ W 2 described later is employed, and the smaller this ⁇ W 2 is, the higher the water resistance is.
  • ⁇ W 1 is preferably 5.0% by mass or less.
  • ⁇ W 1 of the glass can be 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.5% by mass or less, 1.2% by mass or less % or less, 1.0 mass% or less, 0.9 mass% or less, 0.8 mass% or less, 0.7 mass% or less, 0.6 mass% or less, 0.5 mass% or less, 0.4 mass%
  • the content may be 0.3% by mass or less and 0.2% by mass or less.
  • the ⁇ W 1 that can be achieved by this embodiment is, for example, 0.01 to 5.0% by mass.
  • ⁇ W 2 of the glass fiber is less than 0.50% by mass.
  • ⁇ W 2 of the glass composition of the present embodiment may be less than 0.50 mass%, 0.45 mass% or less, 0.40 mass% or less, 0.35 mass% or less, 0.30 mass% or less, It may be 0.25% by mass or less, and 0.20% by mass or less.
  • ⁇ W 2 that can be realized by this embodiment is, for example, 0.01% by mass or more and less than 0.50% by mass.
  • the glass fiber of this embodiment is made of the glass composition described above.
  • the glass fibers of this embodiment may be long glass fibers or short glass fibers.
  • Long glass fibers are produced by flowing a viscosity-controlled glass melt through a nozzle and winding it up with a winder. This continuous fiber is cut to an appropriate length at the time of use.
  • Short glass fibers are manufactured by blowing away glass melt using high-pressure air, centrifugal force, or the like. Short glass fibers are sometimes called glass wool because they have a cotton-like morphology.
  • the average fiber diameter of the glass fibers is, for example, 0.1 to 50 ⁇ m.
  • the average fiber diameter of the glass fibers may be 0.1 ⁇ m or more, 0.2 ⁇ m or more, 0.3 ⁇ m or more, 0.4 ⁇ m or more, and even 0.5 ⁇ m or more, 50 ⁇ m or less, 40 ⁇ m or less, It may be 30 ⁇ m or less, or 25 ⁇ m or less.
  • the average fiber diameter may be 1 ⁇ m or more, 2 ⁇ m or more, 3 ⁇ m or more, 4 ⁇ m or more, or even 5 ⁇ m or more.
  • the average fiber diameter may be 10 ⁇ m or less, 5 ⁇ m or less, 4 ⁇ m or less, 3 ⁇ m or less, 2 ⁇ m or less, or even 1 ⁇ m or less.
  • the glass wool of this embodiment contains the above-mentioned glass fibers.
  • the glass wool of this embodiment is, for example, an aggregate of the above-mentioned short glass fibers containing voids inside, and has various shapes depending on the area of use, such as a lump, a flat plate, a curved plate, a corrugated plate, and a cylindrical shape. I can do it.
  • the glass wool of this embodiment can have high chemical durability. Therefore, the glass wool of this embodiment maintains its properties as a heat insulating material and/or sound absorbing material for a long period of time, even in areas where water such as rainwater can enter, areas in highly acidic environments such as chemical factories, etc. Can be maintained stably.
  • Example and comparative example Ordinary glass raw materials such as silica sand were prepared to have the compositions shown in Tables 1 to 7, and batches of glass raw materials were prepared for each example and comparative example. Using an electric furnace, each batch was heated to 1500-1600° C. to melt it and maintained there for about 4 hours until the composition became uniform. Thereafter, a part of the molten glass (glass melt) was poured out onto an iron plate and slowly cooled to room temperature in an electric furnace to obtain a bulk glass composition (plate-like material, glass sample).
  • glass melt glass melt
  • the method for evaluating the characteristics will be explained below.
  • Glass-transition temperature The thermal expansion coefficient of the obtained glass composition was measured using a commercially available dilatometer (Rigaku Co., Ltd., Thermomechanical Analyzer, TMA8510), and the glass transition temperature was determined from the thermal expansion curve.
  • the platinum ball pulling method refers to the relationship between the load (resistance) applied when a platinum ball is immersed in molten glass and pulled up with uniform motion, and the gravity and buoyancy force acting on the platinum ball. This is a method of measuring viscosity by applying Stokes' law, which describes the relationship between viscosity and falling speed when minute particles settle in a fluid.
  • devitrification temperature A glass composition pulverized to a particle size of 1.0 to 2.8 mm was placed in a platinum boat, held in an electric furnace with a temperature gradient (800 to 1400°C) for 2 hours, and placed at the position where crystals appeared.
  • the devitrification temperature was determined from the maximum temperature of the corresponding electric furnace. When the glass became cloudy and crystals could not be observed, the maximum temperature of the electric furnace corresponding to the position where the cloudiness appeared was taken as the devitrification temperature.
  • the particle size is a value measured by a sieving method.
  • the temperature difference ⁇ T is the temperature difference obtained by subtracting the devitrification temperature from the working temperature.
  • Glass single fibers (filaments) were produced using the obtained glass composition (bulk). That is, the glass composition (bulk) was remelted in an electric furnace and then molded into pellets while being cooled. Using this pellet, a single glass fiber having a diameter of 15 ⁇ m was produced.
  • the tensile modulus of the obtained glass fiber was measured in accordance with the Japanese Industrial Standards (JIS) "Testing method for tensile properties of carbon fibers - monofilament R7606:2000".
  • JIS Japanese Industrial Standards
  • Glass single fibers were produced using the obtained glass composition (bulk). That is, the glass composition (bulk) was remelted in an electric furnace and then molded into pellets while being cooled. Using this pellet, a single glass fiber having a diameter of 15 ⁇ m was produced.
  • - Acid resistance Cut a single glass fiber with a diameter of 15 ⁇ m into a length of 20 mm, weigh out the same number of grams as the specific gravity of the glass, and immerse this glass fiber in 100 mL of a 10 mass % sulfuric acid aqueous solution at 80°C for 24 hours. Loss in mass The mass reduction rate was determined as ⁇ W 1 .
  • Examples 1 to 75 have a Young's modulus of 77 to 93 GPa, a tensile modulus of elasticity of 69 to 88 GPa, a glass transition temperature of 562 to 782°C, a working temperature of 1208 to 1297°C, and a temperature difference ⁇ T (working temperature - devitrification temperature) of 2 to 271. °C, ⁇ W 1 0.16 to 2.61% by mass, and ⁇ W 2 0.14 to 0.48% by mass.
  • the glass composition of Comparative Example 1 had a plate glass composition, a relatively low glass transition temperature of 553° C., and a relatively large ⁇ W 2 of 0.50% by mass.
  • the glass composition of Comparative Example 2 has a C glass composition.
  • C glass has a relatively low glass transition temperature of 549°C.
  • C glass has a high B 2 O 3 content, and there is concern that it may affect manufacturing equipment.

Abstract

The present disclosure provides novel glass fibers which are suitable for mass production, while being suitable for use as a thermal insulation material and/or a sound absorbing material. The present disclosure provides glass fibers which contain a glass composition that contains, in mass%, 50 ≤ SiO2 ≤ 75, 0 ≤ B2O3 ≤ 4, 5 ≤ Al2O3 ≤ 15, 5 ≤ CaO ≤ 30 and 0 ≤ (Li2O + Na2O + K2O) ≤ 20, or alternatively a glass composition that contains, in mass%, 50 ≤ SiO2 ≤ 75, 0 ≤ B2O3 ≤ 4, 0.1 ≤ (MgO + CaO) ≤ 20, 9 ≤ (Li2O + Na2O + K2O) ≤ 20 and 5 ≤ ZrO2 ≤ 20.

Description

ガラス繊維glass fiber
　本発明は、断熱材および／または防音材としての使用に適したガラス繊維に関する。 The present invention relates to glass fibers suitable for use as thermal and/or soundproofing materials.
　グラスウールは、ガラスを綿状に繊維化したガラス短繊維の集積体であり、内部に多くの空気層を含むため、断熱性能や吸音性能に優れ、建築物・車両などの断熱・吸音材として用いられている。また、グラスウールは燃えることがなく、不燃材料としても用いられる。特許文献１には、このようなグラスウール用のガラス繊維として、ソーダライムガラスやＡガラスが好ましいことが開示されている。 Glass wool is an aggregate of short glass fibers made from glass fibers, and because it contains many air layers inside, it has excellent insulation and sound-absorbing performance, and is used as insulation and sound-absorbing material for buildings, vehicles, etc. It is being Additionally, glass wool does not burn and is used as a noncombustible material. Patent Document 1 discloses that soda lime glass and A glass are preferable as glass fibers for such glass wool.
特開２０１６－１４１２４８号公報Japanese Patent Application Publication No. 2016-141248
　ソーダライムガラスやＡガラスのようないわゆる板ガラス組成には、耐水性が不十分であり、ガラス繊維の断熱や防音の性能を徐々に低下させるという問題がある。化学的耐久性に優れたガラス組成としてはＣガラス組成が知られている。しかし、Ｃガラス組成は、三酸化二ホウ素（Ｂ2Ｏ3）を４～６質量％程度含有する。Ｂ2Ｏ3は、ガラス原料の熔融時に飛散しやすく、熔融窯の炉壁や蓄熱窯を浸食する。このため、上記程度にＢ2Ｏ3を含むガラス組成は、それを製造する装置の寿命に影響を及ぼしうる。そこで、本発明は、断熱材および／または吸音材としての使用に適し、かつ量産にも適した、新たなガラス繊維を提供することを目的とする。 So-called sheet glass compositions such as soda-lime glass and A-glass have a problem in that they have insufficient water resistance and gradually reduce the thermal insulation and soundproofing performance of glass fibers. C glass composition is known as a glass composition with excellent chemical durability. However, the C glass composition contains about 4 to 6% by mass of diboron trioxide (B 2 O 3 ). B 2 O 3 easily scatters when glass raw materials are melted, and corrodes the walls of the melting furnace and the heat storage furnace. Therefore, a glass composition containing B 2 O 3 to the above-mentioned extent can affect the life of the equipment that manufactures it. Therefore, an object of the present invention is to provide a new glass fiber suitable for use as a heat insulating material and/or a sound absorbing material, and also suitable for mass production.
　本発明は、断熱材および／または吸音材用のガラス繊維であって、
　質量％で表示して、
　　５０≦ＳｉＯ2≦７５、
　　　０≦Ｂ2Ｏ3≦４、
　　　５≦Ａｌ2Ｏ3≦１５、
　　　５≦ＣａＯ≦３０、
　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０、
　の成分を含有する、ガラス組成物を含む、ガラス繊維を提供する。 The present invention is a glass fiber for a heat insulating material and/or a sound absorbing material,
Displayed in mass%,
50≦SiO 2 ≦75,
0≦B 2 O 3 ≦4,
5≦Al 2 O 3 ≦15,
5≦CaO≦30,
0≦( Li2O + Na2O + K2O )≦20,
A glass fiber comprising a glass composition containing the following components is provided.
　本発明は、その別の側面から、断熱材および／または吸音材用のガラス繊維であって、
　質量％で表示して、
　　５０≦ＳｉＯ2≦７５、
　　　０≦Ｂ2Ｏ3≦４、
　０．１≦（ＭｇＯ＋ＣａＯ）≦２０、
　　　９≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０、
　　　５≦ＺｒＯ2≦２０、
　の成分を含有する、ガラス組成物を含む、ガラス繊維を提供する。 Another aspect of the present invention is a glass fiber for a heat insulating material and/or a sound absorbing material,
Displayed in mass%,
50≦SiO 2 ≦75,
0≦B 2 O 3 ≦4,
0.1≦(MgO+CaO)≦20,
9≦( Li2O + Na2O + K2O )≦20,
5≦ZrO 2 ≦20,
A glass fiber comprising a glass composition containing the following components is provided.
　本発明によれば、断熱材および／または吸音材における使用に適し、かつ量産にも適した、新たなガラス繊維が提供される。 According to the present invention, a new glass fiber is provided that is suitable for use in heat insulating materials and/or sound absorbing materials, and is also suitable for mass production.
　以下、本発明の実施形態を説明するが、以下の説明は本発明を特定の実施形態に限定する趣旨ではない。本明細書において、「実質的に含有しない」および「実質的に含有されない」は、含有率が、０．１質量％未満、０．０５質量％未満、０．０１質量％未満、さらに０．００５質量％未満、特に０．００３質量％未満、場合によっては０．００１質量％未満であることを意味する。「実質的に」は、ガラス原料、製造装置、成形装置などに由来する微量の不純物の含有を許容する趣旨である。「主成分」は、質量基準で含有率が最も大きい成分を意味する。「Ｔ－Ｆｅ2Ｏ3」は、三酸化二鉄（Ｆｅ2Ｏ3）に換算した全酸化鉄を意味する。「アルカリ金属酸化物」は、酸化リチウム（Ｌｉ2Ｏ）、酸化ナトリウム（Ｎａ2Ｏ）および酸化カリウム（Ｋ2Ｏ）を意味する。以下に述べる含有率の上限及び下限は、任意に組み合わせることができる。 Embodiments of the present invention will be described below, but the following description is not intended to limit the present invention to specific embodiments. In this specification, "not substantially containing" and "not substantially containing" mean that the content is less than 0.1% by mass, less than 0.05% by mass, less than 0.01% by mass, and even 0. This means less than 0.005% by weight, in particular less than 0.003% by weight, and in some cases less than 0.001% by weight. "Substantially" means that the inclusion of trace amounts of impurities originating from glass raw materials, manufacturing equipment, molding equipment, etc. is allowed. "Main component" means a component having the highest content on a mass basis. “T-Fe 2 O 3 ” means total iron oxide converted to diiron trioxide (Fe 2 O 3 ). "Alkali metal oxide" means lithium oxide (Li 2 O), sodium oxide (Na 2 O) and potassium oxide (K 2 O). The upper and lower limits of the content described below can be arbitrarily combined.
　なお、「断熱材および／または吸音材用のガラス繊維」は、詳細には、「断熱材および吸音材からなる群より選択される少なくとも１つとして使用されるガラス繊維」の意味である。 In addition, "glass fiber for heat insulating material and/or sound absorbing material" specifically means "glass fiber used as at least one selected from the group consisting of heat insulating material and sound absorbing material."
　＜ガラス組成物の成分＞
（ガラス組成Ａ）
　ガラス組成物の一例（以下、ガラス組成Ａ）は、質量％で表示して、
　　５０≦ＳｉＯ2≦７５、
　　　０≦Ｂ2Ｏ3≦４、
　　　５≦Ａｌ2Ｏ3≦１５、
　　　５≦ＣａＯ≦３０、
　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０、
　の成分を含有する。 <Components of glass composition>
(Glass composition A)
An example of a glass composition (hereinafter referred to as glass composition A) is expressed in mass%,
50≦SiO 2 ≦75,
0≦B 2 O 3 ≦4,
5≦Al 2 O 3 ≦15,
5≦CaO≦30,
0≦( Li2O + Na2O + K2O )≦20,
Contains the following ingredients.
　ガラス組成Ａにおける二酸化ケイ素（ＳｉＯ2）の含有率は、５５質量％以上７２質量％以下でありうる。酸化アルミニウム（Ａｌ2Ｏ3）の含有率は、５質量％以上１４質量％以下でありうる。酸化カルシウム（ＣａＯ）の含有率は、５質量％以上２８質量％以下でありうる。三酸化二ホウ素（Ｂ2Ｏ3）の含有率は、０．１質量％以上４質量％以下でありうる。ガラス組成Ａは、Ｂ2Ｏ3を実質的に含有しない組成でありうる。アルカリ金属酸化物の含有率の合計（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）は、０．１質量％以上２０質量％以下でありうる。ガラス組成Ａは、アルカリ金属酸化物を実質的に含有しない組成でありうる。ガラス組成Ａは、上述した各成分以外の成分を実質的に含有しなくてもよい。 The content of silicon dioxide (SiO 2 ) in glass composition A may be 55% by mass or more and 72% by mass or less. The content of aluminum oxide (Al 2 O 3 ) may be 5% by mass or more and 14% by mass or less. The content of calcium oxide (CaO) may be 5% by mass or more and 28% by mass or less. The content of diboron trioxide (B 2 O 3 ) may be 0.1% by mass or more and 4% by mass or less. Glass composition A may be a composition that does not substantially contain B 2 O 3 . The total content of alkali metal oxides (Li 2 O+Na 2 O+K 2 O) may be 0.1% by mass or more and 20% by mass or less. Glass composition A may be a composition substantially free of alkali metal oxides. Glass composition A does not need to contain substantially any components other than the above-mentioned components.
（ガラス組成Ａの具体例）
　以下に、より具体的なガラス組成Ａとして、組成Ａ－１～Ａ－４を例示する。 (Specific example of glass composition A)
Below, compositions A-1 to A-4 are illustrated as more specific glass compositions A.
　（組成Ａ－１）
　組成Ａ－１は、質量％表示で以下の成分を含有する。
　　５０≦ＳｉＯ2≦６７、
　　　０≦Ｂ2Ｏ3＜２、
　　　５≦Ａｌ2Ｏ3≦１５、
　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
　　　１≦ＭｇＯ≦１０、
　　１０≦ＣａＯ≦３０、
　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦１２
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５ (Composition A-1)
Composition A-1 contains the following components in mass %.
50≦SiO 2 ≦67,
0≦B 2 O 3 <2,
5≦Al 2 O 3 ≦15,
45≦(SiO 2 -Al 2 O 3 )≦57,
1≦MgO≦10,
10≦CaO≦30,
0≦( Li2O + Na2O + K2O )≦12
0≦T-Fe 2 O 3 ≦5
　ガラス組成Ａ－１を有するガラス組成物は、耐熱性に優れ、高温に過熱されたときの変形が抑制されるとともに、化学的耐久性に優れる。 The glass composition having glass composition A-1 has excellent heat resistance, suppresses deformation when heated to high temperatures, and has excellent chemical durability.
　ガラス組成Ａ－１における各成分について、以下に説明する。
　（ＳｉＯ2）
　ＳｉＯ2は、ガラスの骨格を形成する成分であり、組成Ａ－１の主成分である。また、ＳｉＯ2は、ガラス形成時の失透温度および粘度を調整する成分であり、耐酸性を向上させる成分である。ＳｉＯ2の含有率は、５０質量％以上６７質量％以下、特に５５質量％以上６５質量％以下であるが、ＳｉＯ2の含有率の下限は、５６質量％以上でありうるし、５７質量％以上、５８質量％以上、５９質量％以上でありうるし、６０質量％より大きくてもよい。ＳｉＯ2の含有率の上限は、６４質量％以下でありうるし、６３質量％以下でありうる。 Each component in glass composition A-1 will be explained below.
( SiO2 )
SiO 2 is a component that forms the skeleton of glass and is the main component of composition A-1. Further, SiO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation, and is a component that improves acid resistance. The content of SiO 2 is 50% by mass or more and 67% by mass or less, particularly 55% by mass or more and 65% by mass or less, but the lower limit of the content of SiO 2 can be 56% by mass or more, and 57% by mass or more. , 58% by mass or more, 59% by mass or more, or even more than 60% by mass. The upper limit of the content of SiO 2 may be 64% by mass or less, or 63% by mass or less.
　（Ｂ2Ｏ3）
　Ｂ2Ｏ3は、ガラスの骨格を形成する成分である。また、Ｂ2Ｏ3は、ガラス形成時の失透温度および粘度を調整する成分でもある。Ｂ2Ｏ3の含有率の下限は、０．１質量％以上でありうる。Ｂ2Ｏ3の含有率の上限は、２質量％未満でありうるし、１．５質量％以下、１質量％以下、０．５質量％以下でありうる。Ｂ2Ｏ3の含有率の上限は、０．１質量％以下であってもよい。組成Ａ－１はＢ2Ｏ3を実質的に含有しなくてもよい。 (B 2 O 3 )
B 2 O 3 is a component that forms the skeleton of glass. Moreover, B 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation. The lower limit of the content of B 2 O 3 may be 0.1% by mass or more. The upper limit of the content of B 2 O 3 may be less than 2% by mass, 1.5% by mass or less, 1% by mass or less, or 0.5% by mass or less. The upper limit of the content of B 2 O 3 may be 0.1% by mass or less. Composition A-1 may be substantially free of B 2 O 3 .
　（Ａｌ2Ｏ3）
　Ａｌ2Ｏ3は、ガラスの骨格を形成する成分である。また、Ａｌ2Ｏ3は、ガラス形成時の失透温度および粘度を調整する成分でもあり、ガラスの耐水性を向上させる成分である。さらに、Ａｌ2Ｏ3は、ガラスのヤング率および耐熱性を向上させる成分である。一方で、過度のＡｌ2Ｏ3の含有は、ガラスの耐酸性を低下させる。Ａｌ2Ｏ3の含有率が５質量％以上１５質量％以下では、ガラスの製造が難しくなるようなガラスの失透温度の上昇が抑えられるとともに、ガラスの耐酸性が高くなる。また、ガラスの融点が過度に高くなることがなく、原料を熔融する際の均一性が増す。Ａｌ2Ｏ3の含有率の下限は、６質量％以上でありうるし、７質量％以上、８質量％以上、８．５質量％以上、９質量％以上、９．５質量％以上、１０質量％以上、１０．５質量％以上、１１質量％以上、さらには１１．１質量％以上でありうる。Ａｌ2Ｏ3の含有率の上限は、１４質量％以下でありうるし、１３質量％以下、１２．５質量％以下、１２質量％未満、さらには１１．９質量％以下でありうる。 ( Al2O3 )
Al 2 O 3 is a component that forms the skeleton of glass. Furthermore, Al 2 O 3 is a component that adjusts the devitrification temperature and viscosity during glass formation, and is a component that improves the water resistance of the glass. Furthermore, Al 2 O 3 is a component that improves the Young's modulus and heat resistance of glass. On the other hand, excessive content of Al 2 O 3 lowers the acid resistance of the glass. When the Al 2 O 3 content is 5% by mass or more and 15% by mass or less, an increase in the devitrification temperature of the glass, which would make glass production difficult, is suppressed, and the acid resistance of the glass is increased. Furthermore, the melting point of the glass does not become excessively high, and the uniformity of melting the raw materials increases. The lower limit of the content of Al 2 O 3 may be 6% by mass or more, 7% by mass or more, 8% by mass or more, 8.5% by mass or more, 9% by mass or more, 9.5% by mass or more, 10% by mass % or more, 10.5% by mass or more, 11% by mass or more, and even 11.1% by mass or more. The upper limit of the content of Al 2 O 3 may be 14% by mass or less, 13% by mass or less, 12.5% by mass or less, less than 12% by mass, or even 11.9% by mass or less.
　（ＳｉＯ2－Ａｌ2Ｏ3）
　ガラスの耐酸性向上の観点からは、ＳｉＯ2の含有率からＡｌ2Ｏ3の含有率を引いた値（ＳｉＯ2－Ａｌ2Ｏ3）の下限は、４５質量％以上、４７質量％以上、４８質量％超、４８．５質量％以上、４９質量％超でありうるし、さらには４９．５質量％以上でありうる。また、（ＳｉＯ2－Ａｌ2Ｏ3）の上限は、５７質量％以下でありうるし、５６質量％以下、５５質量％以下、５４質量％以下、５３．５質量％以下、５３質量％以下、さらには５２質量％以下でありうる。 (SiO 2 -Al 2 O 3 )
From the viewpoint of improving the acid resistance of glass, the lower limit of the value obtained by subtracting the Al 2 O 3 content from the SiO 2 content (SiO 2 - Al 2 O 3 ) is 45% by mass or more, 47% by mass or more, It can be more than 48% by mass, more than 48.5% by mass, more than 49% by mass, and even more than 49.5% by mass. Further, the upper limit of (SiO 2 -Al 2 O 3 ) may be 57% by mass or less, 56% by mass or less, 55% by mass or less, 54% by mass or less, 53.5% by mass or less, 53% by mass or less, Furthermore, it may be 52% by mass or less.
　（ＳｉＯ2－Ｂ2Ｏ3－Ａｌ2Ｏ3）
　ガラスの耐酸性向上の観点からは、ＳｉＯ2の含有率からＢ2Ｏ3の含有率を引いてさらにＡｌ2Ｏ3の含有率を引いた値（ＳｉＯ2－Ｂ2Ｏ3－Ａｌ2Ｏ3）の下限は、４５質量％以上、４６質量％以上、４７質量％以上、４８質量％超、４８．５質量％以上、４９質量％超でありうるし、さらには４９．５質量％以上でありうる。また、（ＳｉＯ2－Ｂ2Ｏ3－Ａｌ2Ｏ3）の上限は、５６質量％以下でありうるし、５５質量％以下、５４質量％以下、５３質量％以下、５３．５質量％以下、５２質量％以下、さらには５１質量％以下でありうる。 (SiO 2 -B 2 O 3 -Al 2 O 3 )
From the perspective of improving the acid resistance of glass, the value obtained by subtracting the B 2 O 3 content from the SiO 2 content and further subtracting the Al 2 O 3 content (SiO 2 -B 2 O 3 -Al 2 O 3 ) The lower limit may be 45% by mass or more, 46% by mass or more, 47% by mass or more, more than 48% by mass, 48.5% by mass or more, more than 49% by mass, and even 49.5% by mass or more. It's possible. Further, the upper limit of (SiO 2 -B 2 O 3 -Al 2 O 3 ) may be 56% by mass or less, 55% by mass or less, 54% by mass or less, 53% by mass or less, 53.5% by mass or less, It may be 52% by mass or less, or even 51% by mass or less.
　（ＭｇＯ、ＣａＯ）
　ＭｇＯおよびＣａＯは、ガラス形成時の失透温度および粘度を調整する成分である。また、ＭｇＯおよびＣａＯは、ヤング率を向上させる成分でもある。ＭｇＯの含有率は、１質量％以上１０質量％以下であるが、下限は、１．５質量％以上、１．８質量％以上、さらには２質量％以上でありうる。ＭｇＯの含有率の上限は、８質量％以下、６質量％以下、５質量％以下、４．５質量％以下、さらには４質量％以下でありうる。 (MgO, CaO)
MgO and CaO are components that adjust the devitrification temperature and viscosity during glass formation. Moreover, MgO and CaO are also components that improve Young's modulus. The content of MgO is 1% by mass or more and 10% by mass or less, but the lower limit can be 1.5% by mass or more, 1.8% by mass or more, or even 2% by mass or more. The upper limit of the content of MgO may be 8% by mass or less, 6% by mass or less, 5% by mass or less, 4.5% by mass or less, or even 4% by mass or less.
　ＣａＯの含有率が１０質量％以上３０質量％以下では、失透温度の過度な上昇を抑制しながらガラスの失透温度および熔融時の粘度を、ガラス組成物の製造に適した範囲とすることができる。ＣａＯの含有率の下限は、１５質量％以上でありうるし、１６質量％以上、１７質量％以上、１８質量％以上、さらに１９質量％以上、場合によっては２０質量％以上でありうる。ＣａＯの含有率の上限は、２８質量％以下でありうるし、２７質量％以下、２６質量％以下、２５質量％以下、さらには２４質量％以下でありうる。 When the content of CaO is 10% by mass or more and 30% by mass or less, the devitrification temperature and the viscosity at the time of melting of the glass should be in a range suitable for manufacturing a glass composition while suppressing an excessive increase in the devitrification temperature. I can do it. The lower limit of the CaO content may be 15% by mass or more, 16% by mass or more, 17% by mass or more, 18% by mass or more, further 19% by mass or more, and in some cases 20% by mass or more. The upper limit of the content of CaO may be 28% by mass or less, 27% by mass or less, 26% by mass or less, 25% by mass or less, or even 24% by mass or less.
　（ＭｇＯ＋ＣａＯ）
　ガラスの熔融性や成形性に関し、ＭｇＯおよびＣａＯの含有率の和（ＭｇＯ＋ＣａＯ）の値が重要となる。ガラスの製造に適した熔融性や成形性を得る観点からは、（ＭｇＯ＋ＣａＯ）の下限は、８質量％以上、９質量％以上、９．５質量％以上、１０質量％以上、１０．５質量％以上、１１質量％以上、１１．５質量％以上、１２質量％以上、１３質量％以上、１３．５質量％以上、１４質量％以上、１４．５質量％以上、１５質量％以上、１６質量％以上、１７質量％以上、１８質量％以上、１９質量％以上、２０質量％以上、２１質量％以上、２２質量％以上でありうる。また、（ＭｇＯ＋ＣａＯ）の上限は、４０質量％以下が好ましく、３５質量％以下、３２質量％以下、３０質量％以下、２９質量％以下、２８質量％以下、２７質量％以下、２６．５質量％以下、２６質量％以下、２５質量％以下、２４質量％以下、２３質量％以下でありうる。 (MgO+CaO)
Regarding the meltability and moldability of glass, the value of the sum of the contents of MgO and CaO (MgO+CaO) is important. From the viewpoint of obtaining meltability and formability suitable for glass production, the lower limits of (MgO+CaO) are 8% by mass or more, 9% by mass or more, 9.5% by mass or more, 10% by mass or more, and 10.5% by mass. % or more, 11 mass% or more, 11.5 mass% or more, 12 mass% or more, 13 mass% or more, 13.5 mass% or more, 14 mass% or more, 14.5 mass% or more, 15 mass% or more, 16 It can be at least 17% by mass, at least 18% by mass, at least 19% by mass, at least 20% by mass, at least 21% by mass, and at least 22% by mass. Further, the upper limit of (MgO+CaO) is preferably 40% by mass or less, 35% by mass or less, 32% by mass or less, 30% by mass or less, 29% by mass or less, 28% by mass or less, 27% by mass or less, 26.5% by mass % or less, 26% by mass or less, 25% by mass or less, 24% by mass or less, or 23% by mass or less.
　（ＳｒＯ）
　組成Ａ－１は酸化ストロンチウム（ＳｒＯ）をさらに含有しうる。ＳｒＯは、ガラス形成時の失透温度および粘度を調整する成分である。一方で、過度のＳｒＯの含有はガラスの耐酸性を低下させる。ＳｒＯの含有率の下限は、０．１質量％以上でありうるし、０．５質量％以上、１質量％以上、２質量％以上、３質量％以上、４質量％以上、５質量％以上、６質量％以上、７質量％以上、さらには８質量％以上でありうる。ＳｒＯの含有率の上限は、１５質量％以下でありうるし、１２質量％以下、１０質量％以下、８質量％以下、６質量％以下、５質量％以下、４質量％以下、３質量％以下、２質量％以下、１．５質量％以下、１質量％以下、０．５質量％以下でありうる。ＳｒＯの含有率の上限は、０．１質量％以下であってもよい。組成Ａ－１はＳｒＯを実質的に含有しなくてもよい。 (SrO)
Composition A-1 may further contain strontium oxide (SrO). SrO is a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, excessive SrO content reduces the acid resistance of the glass. The lower limit of the content of SrO may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, 5% by mass or more, It may be 6% by mass or more, 7% by mass or more, or even 8% by mass or more. The upper limit of the content of SrO can be 15% by mass or less, 12% by mass or less, 10% by mass or less, 8% by mass or less, 6% by mass or less, 5% by mass or less, 4% by mass or less, 3% by mass or less , 2% by mass or less, 1.5% by mass or less, 1% by mass or less, and 0.5% by mass or less. The upper limit of the SrO content may be 0.1% by mass or less. Composition A-1 may be substantially free of SrO.
　（ＭｇＯ＋ＣａＯ＋ＳｒＯ）
　ガラスの熔融性や成形性に関し、ＭｇＯ、ＣａＯおよびＳｒＯの含有率の合計（ＭｇＯ＋ＣａＯ＋ＳｒＯ）の値が重要となる。ガラスの製造に適した熔融性や成形性を得る観点からは、（ＭｇＯ＋ＣａＯ＋ＳｒＯ）の下限は、１５質量％以上が好ましく、１８質量％以上、２０質量％以上、２１質量％以上、２２質量％以上、２３質量％以上、２４質量％以上、２５質量％以上、２６質量％以上、２７質量％以上、２８質量％以上でありうる。また、（ＭｇＯ＋ＣａＯ＋ＳｒＯ）の上限は、４０質量％以下が好ましく、３８質量％以下、３６質量％以下、３５質量％以下、３４質量％以下でありうる。 (MgO+CaO+SrO)
Regarding the meltability and moldability of glass, the value of the total content of MgO, CaO and SrO (MgO+CaO+SrO) is important. From the viewpoint of obtaining meltability and formability suitable for glass production, the lower limit of (MgO + CaO + SrO) is preferably 15% by mass or more, 18% by mass or more, 20% by mass or more, 21% by mass or more, 22% by mass or more. , 23% by mass or more, 24% by mass or more, 25% by mass or more, 26% by mass or more, 27% by mass or more, and 28% by mass or more. Further, the upper limit of (MgO+CaO+SrO) is preferably 40% by mass or less, and may be 38% by mass or less, 36% by mass or less, 35% by mass or less, or 34% by mass or less.
　（ＢａＯ）
　組成Ａ－１は酸化バリウム（ＢａＯ）をさらに含有しうる。ＢａＯは、ガラス形成時の失透温度および粘度を調整する成分である。一方で、過度のＢａＯの含有はガラスの耐酸性を低下させる。ＢａＯの含有率の上限は、１０質量％以下でありうるし、５質量％以下、２質量％以下、１．５質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成Ａ－１はＢａＯを実質的に含有しなくてもよい。 (BaO)
Composition A-1 may further contain barium oxide (BaO). BaO is a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, excessive BaO content reduces the acid resistance of the glass. The upper limit of the BaO content may be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less. % by mass or less. Composition A-1 may be substantially free of BaO.
　（ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ）
　ガラスの熔融性や成形性に関し、ＭｇＯ、ＣａＯ、ＳｒＯおよびＢａＯの含有率の合計（ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ）の値が重要となる。ガラスの製造に適した熔融性や成形性を得る観点からは、（ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ）の下限は、１５質量％以上が好ましく、１８質量％以上、２０質量％以上、２１質量％以上、２２質量％以上、２３質量％以上、２４質量％以上、２５質量％以上、２６質量％以上、２７質量％以上、２８質量％以上でありうる。また、（ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＢａＯ）の上限は、４０質量％以下が好ましく、３８質量％以下、３６質量％以下、３５質量％以下、３４質量％以下でありうる。 (MgO+CaO+SrO+BaO)
Regarding the meltability and moldability of glass, the value of the total content of MgO, CaO, SrO and BaO (MgO+CaO+SrO+BaO) is important. From the viewpoint of obtaining meltability and formability suitable for glass production, the lower limit of (MgO+CaO+SrO+BaO) is preferably 15% by mass or more, 18% by mass or more, 20% by mass or more, 21% by mass or more, 22% by mass or more. , 23% by mass or more, 24% by mass or more, 25% by mass or more, 26% by mass or more, 27% by mass or more, and 28% by mass or more. Further, the upper limit of (MgO+CaO+SrO+BaO) is preferably 40% by mass or less, and may be 38% by mass or less, 36% by mass or less, 35% by mass or less, or 34% by mass or less.
　（ＺｎＯ）
　組成Ａ－１は酸化亜鉛（ＺｎＯ）をさらに含有しうる。また、組成Ａ－１に含まれた場合にＺｎＯは、ガラス形成時の失透温度および粘度を調整する成分である。ただしＺｎＯは、その原料が相対的に高価であることから、その含有率は低いほうがよい。組成Ａ－１においてＺｎＯの含有率の上限は、１０質量％以下でありうるし、５質量％以下、２質量％以下、１．５質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成Ａ－１はＺｎＯを実質的に含有しなくてもよい。 (ZnO)
Composition A-1 may further contain zinc oxide (ZnO). Furthermore, when included in composition A-1, ZnO is a component that adjusts the devitrification temperature and viscosity during glass formation. However, since the raw material for ZnO is relatively expensive, the content thereof should be low. In composition A-1, the upper limit of the content of ZnO may be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, Furthermore, it may be 0.1% by mass or less. Composition A-1 may be substantially free of ZnO.
　（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）
　アルカリ金属酸化物（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）は、ガラス形成時の失透温度および粘度を調整する成分である。アルカリ金属酸化物の含有率の合計（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の値が０質量％以上４質量％以下では、失透温度の過度な上昇を抑制しながら熔融ガラスの失透温度および粘度を、ガラスの製造に適した範囲とすることができる。また、ガラスの融点の上昇を抑え、ガラス原料のより均一な熔融を実施できながらも、ガラス転移温度が過度に低下することなく、高いガラスの耐熱性を確保できる。さらに、ガラスの耐酸性が高くなる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の下限は、０質量％より大きくてもよいし、０．１質量％以上でありうる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の上限は、３質量％以下でありうるし、２質量％以下、２質量％未満でありうる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の値を０．１質量％以下としてもよい。組成Ａ－１はアルカリ金属酸化物を実質的に含有しなくてもよい。Ｌｉ2Ｏ、Ｎａ2Ｏ、およびＫ2Ｏのそれぞれは任意成分である。言い換えるとこれらの各成分の含有率の下限は０であってもよい。 (Li 2 O, Na 2 O, K 2 O)
Alkali metal oxides (Li 2 O, Na 2 O, K 2 O) are components that adjust the devitrification temperature and viscosity during glass formation. When the value of the total content of alkali metal oxides (Li 2 O + Na 2 O + K 2 O) is 0% by mass or more and 4% by mass or less, the devitrification temperature and viscosity of the molten glass are reduced while suppressing an excessive increase in the devitrification temperature. can be in a range suitable for glass production. Further, while suppressing the increase in the melting point of the glass and achieving more uniform melting of the glass raw materials, high heat resistance of the glass can be ensured without excessively lowering the glass transition temperature. Furthermore, the acid resistance of the glass increases. The lower limit of (Li 2 O+Na 2 O+K 2 O) may be greater than 0% by mass, or may be greater than or equal to 0.1% by mass. The upper limit of (Li 2 O+Na 2 O+K 2 O) may be 3% by mass or less, 2% by mass or less, and less than 2% by mass. The value of (Li 2 O+Na 2 O+K 2 O) may be 0.1% by mass or less. Composition A-1 may be substantially free of alkali metal oxides. Each of Li 2 O, Na 2 O, and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be zero.
　酸化リチウム（Ｌｉ2Ｏ）の含有率の下限は、０．１質量％以上でありうるし、０．２質量％以上、０．３質量％以上、さらには０．４質量％以上でありうる。Ｌｉ2Ｏの含有率の上限は、４質量％以下でありうるし、３質量％以下、２質量％以下、１．５質量％以下、さらには１質量％以下でありうる。 The lower limit of the content of lithium oxide (Li 2 O) may be 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, and even 0.4% by mass or more. The upper limit of the content of Li 2 O may be 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, and even 1% by mass or less.
　酸化ナトリウム（Ｎａ2Ｏ）の含有率の下限は、０．１質量％以上でありうるし、０．２質量％以上でありうる。Ｎａ2Ｏの含有率の上限は、４質量％以下でありうるし、３質量％以下、２質量％以下、１．５質量％以下、さらには１質量％以下でありうる。 The lower limit of the content of sodium oxide (Na 2 O) may be 0.1% by mass or more, or 0.2% by mass or more. The upper limit of the content of Na 2 O may be 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, or even 1% by mass or less.
　酸化カリウム（Ｋ2Ｏ）の含有率の下限は、０．１質量％以上でありうるし、０．２質量％以上でありうる。Ｋ2Ｏの含有率の上限は、４質量％以下でありうるし、３質量％以下、２質量％以下、１．５質量％以下、さらには１質量％以下でありうる。 The lower limit of the potassium oxide (K 2 O) content may be 0.1% by mass or more, or 0.2% by mass or more. The upper limit of the content of K 2 O may be 4% by mass or less, 3% by mass or less, 2% by mass or less, 1.5% by mass or less, or even 1% by mass or less.
　（ＴｉＯ2）
　組成Ａ－１は二酸化チタン（ＴｉＯ2）をさらに含有しうる。ＴｉＯ2は、ガラスの熔融性および化学的耐久性を向上させ、ガラスの紫外線吸収特性を向上させる成分である。また、ＴｉＯ2は、ガラスの耐酸性や耐水性を向上させる成分である。ただしＴｉＯ2は、その原料が相対的に高価であることから、その含有率は低いほうがよい。ＴｉＯ2の含有率の下限は、０．１質量％以上でありうる。ＴｉＯ2の含有率の上限は、１０質量％以下でありうるし、５質量％以下、２質量％以下、１質量％以下、０．５質量％以下、０．３質量％以下、さらには０．２質量％以下でありうる。組成Ａ－１はＴｉＯ2を実質的に含有しなくてもよい。 ( TiO2 )
Composition A-1 may further contain titanium dioxide (TiO 2 ). TiO 2 is a component that improves the meltability and chemical durability of glass, and improves the ultraviolet absorption characteristics of glass. Furthermore, TiO 2 is a component that improves the acid resistance and water resistance of glass. However, since the raw material for TiO 2 is relatively expensive, the content thereof should be lower. The lower limit of the content of TiO 2 may be 0.1% by mass or more. The upper limit of the content of TiO 2 can be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.3% by mass or less, and even 0. It may be 2% by mass or less. Composition A-1 may be substantially free of TiO 2 .
　（ＺｒＯ2）
　組成Ａ－１は酸化ジルコニウム（ＺｒＯ2）をさらに含有しうる。ＺｒＯ2は、ガラス形成時の失透温度および粘度を調整する成分である。また、ＺｒＯ2は、ガラスの耐酸性や耐アルカリ性を向上させる成分である。さらに、ＺｒＯ2は、ガラスのヤング率および耐熱性を向上させる成分である。ただしＺｒＯ2は、その原料が相対的に高価であることから、その含有率は低いほうがよい。ＺｒＯ2の含有率の上限は、７質量％以下でありうるし、６質量％以下、５質量％以下、４質量％以下、３質量％以下、２質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成Ａ－１はＺｒＯ2を実質的に含有しなくてもよい。 ( ZrO2 )
Composition A-1 may further contain zirconium oxide (ZrO 2 ). ZrO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation. Furthermore, ZrO 2 is a component that improves the acid resistance and alkali resistance of glass. Furthermore, ZrO 2 is a component that improves the Young's modulus and heat resistance of glass. However, since the raw material for ZrO 2 is relatively expensive, the content thereof should be lower. The upper limit of the content of ZrO 2 may be 7% by mass or less, 6% by mass or less, 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, 1% by mass or less, 0.5 It may be less than 0.1% by mass, and even less than 0.1% by mass. Composition A-1 may be substantially free of ZrO 2 .
　（Ｆｅ）
　組成Ａ－１は三酸化二鉄（Ｆｅ2Ｏ3）をさらに含有しうる。鉄（Ｆｅ）は、通常、Ｆｅ2+またはＦｅ3+の状態で存在する。Ｆｅ3+はガラスの紫外線吸収特性を高める成分であり、Ｆｅ2+はガラスの熱線吸収特性を高める成分である。Ｆｅは、意図的に含ませなくとも、工業用原料により不可避的に混入する場合がある。Ｆｅの含有量が少なければ、ガラスの着色を防止することができる。Ｆｅの含有率の上限は、Ｔ－Ｆｅ2Ｏ3により表示して５質量％以下でありうるし、２質量％以下、１質量％以下、０．５質量％以下、０．４質量％以下、０．３質量％以下、０．２質量％以下、さらには０．１質量％以下、０．１質量％未満、０．０８質量％以下、０．０５質量％以下、０．０４質量％以下、さらには０．０３質量％以下でありうる。Ｆｅの含有率の下限は、Ｔ－Ｆｅ2Ｏ3により表示して０．０１質量％以上、０．０５質量％以上、０．１質量％以上、さらに０．２質量％以上でありうる。特にアルカリ金属酸化物の含有率が低いガラス組成において、微量の酸化鉄はガラスの清澄の促進に寄与しうる。 (Fe)
Composition A-1 may further contain diiron trioxide (Fe 2 O 3 ). Iron (Fe) usually exists in the Fe 2+ or Fe 3+ state. Fe 3+ is a component that enhances the ultraviolet absorption properties of glass, and Fe 2+ is a component that enhances heat ray absorption properties of glass. Even if Fe is not intentionally included, it may be unavoidably mixed in with industrial raw materials. If the content of Fe is small, coloring of the glass can be prevented. The upper limit of the content of Fe expressed by T-Fe 2 O 3 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3 mass% or less, 0.2 mass% or less, further 0.1 mass% or less, less than 0.1 mass%, 0.08 mass% or less, 0.05 mass% or less, 0.04 mass% or less , and even 0.03% by mass or less. The lower limit of the content of Fe expressed by T-Fe 2 O 3 may be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, and further 0.2% by mass or more. Particularly in glass compositions with a low content of alkali metal oxides, trace amounts of iron oxide can contribute to promoting glass fining.
　（Ｆ2、Ｃｌ2）
　組成Ａ－１はフッ素（Ｆ2）および塩素（Ｃｌ2）をさらに含有しうる。Ｆ2は、揮発し易いため、溶融時に飛散する可能性があるとともに、ガラス中の含有量を管理し難いという問題もある。Ｆ2の含有率の上限は、５質量％以下でありうるし、２質量％以下、１質量％以下、０．５質量％以下、０．２質量％以下、さらには０．１質量％以下でありうる。組成Ａ－１はＦ2を実質的に含有しなくてもよい。 ( F2 , Cl2 )
Composition A-1 may further contain fluorine (F 2 ) and chlorine (Cl 2 ). Since F 2 easily volatizes, there is a possibility of it scattering during melting, and there is also the problem that it is difficult to control the content in the glass. The upper limit of the content of F2 can be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.2% by mass or less, and even 0.1% by mass or less. It's possible. Composition A-1 may be substantially free of F 2 .
　Ｃｌ2は、揮発し易いため、溶融時に飛散する可能性があるとともに、ガラス中の含有量を管理し難いという問題もある。Ｃｌ2の含有率の上限は、５質量％以下でありうるし、２質量％以下、１質量％以下、０．５質量％以下、０．２質量％以下、さらには０．１質量％以下でありうる。組成Ａ－１はＣｌ2を実質的に含有しなくてもよい。 Since Cl 2 easily volatizes, there is a possibility of it scattering during melting, and there is also the problem that it is difficult to control the content in the glass. The upper limit of the content of Cl 2 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.2% by mass or less, and even 0.1% by mass or less. It's possible. Composition A-1 may be substantially free of Cl 2 .
　組成Ａ－１は、次段落以降に質量％表示で記載する好ましい組成を有しうる。 Composition A-1 may have a preferred composition described in mass % in the following paragraphs.
　　５０≦ＳｉＯ2≦６７、
　　　０≦Ｂ2Ｏ3＜２、
　　　５≦Ａｌ2Ｏ3≦１５、
　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
　　　１≦ＭｇＯ≦１０、
　　１５≦ＣａＯ≦３０、
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
　の成分を含有し、アルカリ金属酸化物を実質的に含有しない組成。 50≦SiO 2 ≦67,
0≦B 2 O 3 <2,
5≦Al 2 O 3 ≦15,
45≦(SiO 2 -Al 2 O 3 )≦57,
1≦MgO≦10,
15≦CaO≦30,
0≦T-Fe 2 O 3 ≦5,
A composition containing the following components and substantially free of alkali metal oxides.
　　５７≦ＳｉＯ2≦６７、
　　　０≦Ｂ2Ｏ3＜２、
　　　５≦Ａｌ2Ｏ3≦１５、
　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
　　　１≦ＭｇＯ≦１０、
　　１５≦ＣａＯ≦３０、
　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
　の成分を含有する組成。 57≦SiO 2 ≦67,
0≦B 2 O 3 <2,
5≦Al 2 O 3 ≦15,
45≦(SiO 2 -Al 2 O 3 )≦57,
1≦MgO≦10,
15≦CaO≦30,
0≦( Li2O + Na2O + K2O )≦4,
0≦T-Fe 2 O 3 ≦5,
A composition containing the following ingredients.
　　５５≦ＳｉＯ2≦６７、
　０．１≦Ｂ2Ｏ3＜２、
　　　５≦Ａｌ2Ｏ3≦１５、
　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
　　　１≦ＭｇＯ≦１０、
　　１５≦ＣａＯ≦３０、
　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
　の成分を含有する組成。 55≦SiO 2 ≦67,
0.1≦B 2 O 3 <2,
5≦Al 2 O 3 ≦15,
45≦(SiO 2 -Al 2 O 3 )≦57,
1≦MgO≦10,
15≦CaO≦30,
0≦( Li2O + Na2O + K2O )≦4,
0≦T-Fe 2 O 3 ≦5,
A composition containing the following ingredients.
　　５０≦ＳｉＯ2≦６７、
　　　０≦Ｂ2Ｏ3＜２、
　　　５≦Ａｌ2Ｏ3≦１５、
　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
　　１≦ＭｇＯ≦１０、
　１０≦ＣａＯ≦３０、
　　　１≦ＳｒＯ≦１５、
　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
　の成分を含有する組成。 50≦SiO 2 ≦67,
0≦B 2 O 3 <2,
5≦Al 2 O 3 ≦15,
45≦(SiO 2 -Al 2 O 3 )≦57,
1≦MgO≦10,
10≦CaO≦30,
1≦SrO≦15,
0≦( Li2O + Na2O + K2O )≦4,
0≦T-Fe 2 O 3 ≦5,
A composition containing the following ingredients.
　以上の各組成において、０≦ＺｎＯ≦２、がさらに成立する組成。 In each of the above compositions, 0≦ZnO≦2 is further satisfied.
　以上の各組成（ただし、０．１≦Ｂ2Ｏ3＜２が成立する組成を除く）において、Ｂ2Ｏ3を実質的に含有しない組成。 Each of the above compositions (excluding compositions where 0.1≦B 2 O 3 <2) does not substantially contain B 2 O 3 .
　（組成Ａ－２）
　組成Ａ－２は、質量％表示で以下の成分を含有する。
　　６５＜ＳｉＯ2≦７５、
　　　０≦Ｂ2Ｏ3＜２、
　　　５≦Ａｌ2Ｏ3≦１５、
　５０＜（ＳｉＯ2－Ａｌ2Ｏ3）≦６０、
　　　１≦ＭｇＯ≦１０、
　　１０≦ＣａＯ≦２５、
　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５ (Composition A-2)
Composition A-2 contains the following components in mass %.
65< SiO2 ≦75,
0≦B 2 O 3 <2,
5≦Al 2 O 3 ≦15,
50<(SiO 2 -Al 2 O 3 )≦60,
1≦MgO≦10,
10≦CaO≦25,
0≦( Li2O + Na2O + K2O )≦4,
0≦T-Fe 2 O 3 ≦5
　ガラス組成Ａ－２を有するガラス繊維は、耐熱性に優れ、高温に過熱されたときの変形が抑制されるとともに、化学的耐久性、特に耐酸性、に優れる。 The glass fiber having the glass composition A-2 has excellent heat resistance, suppresses deformation when heated to high temperatures, and has excellent chemical durability, particularly acid resistance.
　ガラス組成Ａ－２における各成分について、以下に説明する。ただし、各成分の役割について、ガラス組成Ａ－１と重複する記載は割愛する。 Each component in glass composition A-2 will be explained below. However, regarding the role of each component, descriptions that overlap with glass composition A-1 will be omitted.
　（ＳｉＯ2）
　ＳｉＯ2は、組成Ａ－２においても主成分である。ＳｉＯ2の含有率は、６５質量％より大きく７５質量％以下であるが、下限は、６６質量％以上でありうる。ＳｉＯ2の含有率の上限は、７２質量％以下でありうるし、７０質量％以下、６９質量％以下、６８質量％以下、さらには６７質量％以下でありうる。 ( SiO2 )
SiO 2 is also the main component in composition A-2. The content of SiO 2 is greater than 65% by mass and not more than 75% by mass, but the lower limit may be 66% by mass or more. The upper limit of the content of SiO 2 may be 72% by mass or less, 70% by mass or less, 69% by mass or less, 68% by mass or less, or even 67% by mass or less.
　（Ｂ2Ｏ3）（Ａｌ2Ｏ3）
　組成Ａ－２において、Ｂ2Ｏ3およびＡｌ2Ｏ3の含有率は、組成Ａ－１と同様の上限及び下限を有しうる。 (B 2 O 3 ) (Al 2 O 3 )
In composition A-2, the content of B 2 O 3 and Al 2 O 3 can have the same upper and lower limits as composition A-1.
　（ＳｉＯ2－Ａｌ2Ｏ3）
　組成Ａ－２では、ガラスの耐酸性向上の観点から、ＳｉＯ2の含有率からＡｌ2Ｏ3の含有率を引いた値（ＳｉＯ2－Ａｌ2Ｏ3）の下限は、５０質量％超でありうるし、５１質量％以上、５２質量％以上、さらには５３質量％超でありうる。また、（ＳｉＯ2－Ａｌ2Ｏ3）の上限は、６０質量％以下でありうるし、５９質量％以下、、５８質量％以下、さらに５７質量％以下でありうる。 (SiO 2 -Al 2 O 3 )
In composition A-2, from the viewpoint of improving the acid resistance of the glass, the lower limit of the value obtained by subtracting the Al 2 O 3 content from the SiO 2 content (SiO 2 -Al 2 O 3 ) is more than 50% by mass. It can be 51% by mass or more, 52% by mass or more, or even more than 53% by mass. Further, the upper limit of (SiO 2 -Al 2 O 3 ) may be 60% by mass or less, 59% by mass or less, 58% by mass or less, and further 57% by mass or less.
　（ＭｇＯ、ＣａＯ）
　組成Ａ－２において、ＭｇＯの含有率は組成Ａ－１と同様の上限及び下限を有しうる。 (MgO, CaO)
In composition A-2, the MgO content may have the same upper and lower limits as composition A-1.
　組成Ａ－２において、ＣａＯの含有率は１０質量％以上２５質量％以下である。ＣａＯの含有率の下限は、１２質量％以上でありうるし、１３質量％以上、１４質量％以上、さらには１５質量％より大きいことがありうる。ＣａＯの含有率の上限は、２３質量％以下でありうるし、２２質量％以下、２１質量％以下、さらには２０質量％以下でありうる。 In composition A-2, the content of CaO is 10% by mass or more and 25% by mass or less. The lower limit of the CaO content may be 12% by mass or more, 13% by mass or more, 14% by mass or more, and even more than 15% by mass. The upper limit of the CaO content may be 23% by mass or less, 22% by mass or less, 21% by mass or less, or even 20% by mass or less.
　（ＳｒＯ）
　組成Ａ－２はＳｒＯをさらに含有しうる。組成Ａ－２において、ＳｒＯの含有率の上限は、１０質量％以下でありうるし、５質量％以下、２質量％以下、１．５質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％未満でありうる。組成Ａ－２はＳｒＯを実質的に含有しなくてもよい。 (SrO)
Composition A-2 may further contain SrO. In composition A-2, the upper limit of the content of SrO can be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less , and even less than 0.1% by mass. Composition A-2 may be substantially free of SrO.
　（ＢａＯ）
　組成Ａ－２はＢａＯをさらに含有しうる。組成Ａ－２においてＢａＯの含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－２はＢａＯを実質的に含有しなくてもよい。 (BaO)
Composition A-2 may further contain BaO. In composition A-2, the content of BaO may have the same upper and lower limits as in composition A-1. Composition A-2 may be substantially free of BaO.
　（ＺｎＯ）
　組成Ａ－２はＺｎＯをさらに含有しうる。組成Ａ－２においてＺｎＯの含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－２はＺｎＯを実質的に含有しなくてもよい。 (ZnO)
Composition A-2 may further contain ZnO. In composition A-2, the ZnO content may have the same upper and lower limits as composition A-1. Composition A-2 may be substantially free of ZnO.
　（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）
　組成Ａ－２において、アルカリ金属酸化物の含有率の合計（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）は０質量％以上４質量％以下である。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の下限は、０．１質量％以上でありうるし、１質量％以上、１．５質量％以上、さらには２質量％以上でありうる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の上限は、３．５質量％以下でありうるし、３質量％以下でありうる。組成Ａ－２はアルカリ金属酸化物を実質的に含有しなくてもよい。Ｌｉ2Ｏ、Ｎａ2Ｏ、およびＫ2Ｏのそれぞれは任意成分である。言い換えるとこれらの各成分の含有率の下限は０であってもよい。 (Li 2 O, Na 2 O, K 2 O)
In composition A-2, the total content of alkali metal oxides (Li 2 O+Na 2 O+K 2 O) is 0% by mass or more and 4% by mass or less. The lower limit of (Li 2 O+Na 2 O+K 2 O) may be 0.1% by mass or more, 1% by mass or more, 1.5% by mass or more, or even 2% by mass or more. The upper limit of (Li 2 O+Na 2 O+K 2 O) may be 3.5% by mass or less, or 3% by mass or less. Composition A-2 may be substantially free of alkali metal oxides. Each of Li 2 O, Na 2 O, and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be zero.
　組成Ａ－２では、Ｌｉ2Ｏが、上述したアルカリ金属酸化物に基づく効果について特に高い寄与を示す。この観点からは、組成Ａ－２におけるＬｉ2Ｏの含有率の下限は、０．１質量％以上でありうるし、０．５質量％以上、さらには１質量％以上でありうる。Ｌｉ2Ｏの含有率の上限は、４質量％以下でありうるし、３質量％以下、２．５質量％以下でありうるし、２質量％以下でありうる。 In composition A-2, Li 2 O makes a particularly high contribution to the effect based on the alkali metal oxide described above. From this point of view, the lower limit of the content of Li 2 O in composition A-2 may be 0.1% by mass or more, 0.5% by mass or more, or even 1% by mass or more. The upper limit of the content of Li 2 O may be 4% by mass or less, 3% by mass or less, 2.5% by mass or less, or 2% by mass or less.
　組成Ａ－２において、Ｎａ2ＯおよびＫ2Ｏの含有率は、組成Ａ－１と同様の上限および下限を有しうる。 In composition A-2, the contents of Na 2 O and K 2 O can have the same upper and lower limits as composition A-1.
　（ＴｉＯ2）
　組成Ａ－２はＴｉＯ2をさらに含有しうる。組成Ａ－２においてＴｉＯ2の含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－２はＴｉＯ2を実質的に含有しなくてもよい。 ( TiO2 )
Composition A-2 may further contain TiO 2 . In composition A-2, the content of TiO 2 can have the same upper and lower limits as in composition A-1. Composition A-2 may be substantially free of TiO 2 .
　（ＺｒＯ2）
　組成Ａ－２はＺｒＯ2をさらに含有しうる。組成Ａ－２においてＺｒＯ2の含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－２はＺｒＯ2を実質的に含有しなくてもよい。 ( ZrO2 )
Composition A-2 may further contain ZrO 2 . In composition A-2, the content of ZrO 2 can have the same upper and lower limits as composition A-1. Composition A-2 may be substantially free of ZrO 2 .
　（Ｆｅ）（Ｆ2、Ｃｌ2）
　組成Ａ－２は上記各成分をさらに含有しうる。これら各成分の好ましい含有率その他は、組成Ａ－１と同様であるため、記載を省略する。 (Fe) (F 2 , Cl 2 )
Composition A-2 may further contain each of the above components. The preferred contents and other details of each of these components are the same as those for composition A-1, so their description will be omitted.
　（組成Ａ－３）
　組成Ａ－３は、質量％表示で以下の成分を含有する。
　　６０≦ＳｉＯ2≦７５、
　　　０≦Ｂ2Ｏ3≦４、
　　　５≦Ａｌ2Ｏ3≦１５、
　４７≦（ＳｉＯ2－Ａｌ2Ｏ3）≦６０、
　　　１≦ＭｇＯ≦１０、
　　１０≦ＣａＯ≦２５、
　　　４＜（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）＜９
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５ (Composition A-3)
Composition A-3 contains the following components expressed in mass %.
60≦SiO 2 ≦75,
0≦B 2 O 3 ≦4,
5≦Al 2 O 3 ≦15,
47≦(SiO 2 -Al 2 O 3 )≦60,
1≦MgO≦10,
10≦CaO≦25,
4<( Li2O + Na2O + K2O )<9
0≦T-Fe 2 O 3 ≦5
　ガラス組成Ａ－３を有するガラス繊維は、耐熱性に優れ、高温に過熱されたときの変形が抑制されるとともに、化学的耐久性、特に耐酸性、に優れる。 The glass fiber having the glass composition A-3 has excellent heat resistance, suppresses deformation when heated to high temperatures, and has excellent chemical durability, particularly acid resistance.
　ガラス組成Ａ－３における各成分について、以下に説明する。ただし、各成分の役割について、ガラス組成Ａ－１またはＡ－２と重複する記載は割愛する。
　（ＳｉＯ2）
　ＳｉＯ2は、組成Ａ－３においても主成分である。ＳｉＯ2の含有率は、６０質量％以上　７５質量％以下であるが、下限は、６２質量％以上でありうるし、６３質量％以上、６４質量％以上、さらには６５質量％より大きいことがありうる。ＳｉＯ2の含有率の上限は、７２質量％以下でありうるし、７０質量％以下、６９質量％以下、６８質量％以下、さらには６７質量％以下でありうる。 Each component in glass composition A-3 will be explained below. However, regarding the role of each component, descriptions that overlap with the glass composition A-1 or A-2 will be omitted.
( SiO2 )
SiO 2 is also the main component in composition A-3. The content of SiO 2 is 60% by mass or more and 75% by mass or less, but the lower limit can be 62% by mass or more, 63% by mass or more, 64% by mass or more, and even more than 65% by mass. sell. The upper limit of the content of SiO 2 may be 72% by mass or less, 70% by mass or less, 69% by mass or less, 68% by mass or less, or even 67% by mass or less.
　（Ｂ2Ｏ3）
　Ｂ2Ｏ3は、ガラスの骨格を形成する成分である。また、Ｂ2Ｏ3は、ガラス形成時の失透温度および粘度を調整する成分でもある。Ｂ2Ｏ3の含有率の下限は、０．１質量％以上でありうる。Ｂ2Ｏ3の含有率の上限は、４質量％以下でありうるし、３質量％以下、２質量％未満、１．５質量％以下、１質量％以下、０．５質量％以下でありうる。Ｂ2Ｏ3の含有率の上限は、０．１質量％以下であってもよい。組成Ａ－１はＢ2Ｏ3を実質的に含有しなくてもよい。 (B 2 O 3 )
B 2 O 3 is a component that forms the skeleton of glass. Moreover, B 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation. The lower limit of the content of B 2 O 3 may be 0.1% by mass or more. The upper limit of the content of B 2 O 3 may be 4% by mass or less, 3% by mass or less, less than 2% by mass, 1.5% by mass or less, 1% by mass or less, or 0.5% by mass or less. . The upper limit of the content of B 2 O 3 may be 0.1% by mass or less. Composition A-1 may be substantially free of B 2 O 3 .
　（Ａｌ2Ｏ3）
　組成Ａ－３において、Ａｌ2Ｏ3の含有率は、組成Ａ－１と同様の上限及び下限を有しうる。 ( Al2O3 )
In composition A-3, the content of Al 2 O 3 can have the same upper and lower limits as composition A-1.
　（ＳｉＯ2－Ａｌ2Ｏ3）
　組成Ａ－３では、ガラスの耐酸性向上の観点から、ＳｉＯ2の含有率からＡｌ2Ｏ3の含有率を引いた値（ＳｉＯ2－Ａｌ2Ｏ3）の下限は、４７質量％以上、４９質量％超、５０質量％超、５１質量％以上、５２質量％以上、さらに５３質量％超でありうる。また、（ＳｉＯ2－Ａｌ2Ｏ3）の上限は、６０質量％以下でありうるし、５９質量％以下、５８質量％以下、さらには５７質量％以下でありうる。 (SiO 2 -Al 2 O 3 )
In composition A-3, from the viewpoint of improving the acid resistance of the glass, the lower limit of the value obtained by subtracting the content of Al 2 O 3 from the content of SiO 2 (SiO 2 -Al 2 O 3 ) is 47% by mass or more, It can be more than 49% by weight, more than 50% by weight, more than 51% by weight, more than 52% by weight, and even more than 53% by weight. Further, the upper limit of (SiO 2 -Al 2 O 3 ) may be 60% by mass or less, 59% by mass or less, 58% by mass or less, and even 57% by mass or less.
　（ＭｇＯ、ＣａＯ）
　組成Ａ－３において、ＭｇＯの含有率は組成Ａ－１と同様の上限及び下限を有しうる。 (MgO, CaO)
In composition A-3, the MgO content can have the same upper and lower limits as composition A-1.
　組成Ａ－３において、ＣａＯの含有率は１０質量％以上２５質量％以下である。ＣａＯの含有率の下限は、１２質量％以上でありうるし、１３質量％以上、１４質量％以上、さらには１５質量％より大きいことがありうる。ＣａＯの含有率の上限は、２３質量％以下でありうるし、２１質量％以下、２０質量％以下、１９質量％以下、さらには１８質量％以下でありうる。 In composition A-3, the content of CaO is 10% by mass or more and 25% by mass or less. The lower limit of the CaO content may be 12% by mass or more, 13% by mass or more, 14% by mass or more, and even more than 15% by mass. The upper limit of the content of CaO may be 23% by mass or less, 21% by mass or less, 20% by mass or less, 19% by mass or less, or even 18% by mass or less.
　（ＭｇＯ＋ＣａＯ）
　組成Ａ－３においてガラス組成物の成形し易さを重視する場合、ＭｇＯおよびＣａＯの含有率の和（ＭｇＯ＋ＣａＯ）を１１質量％以上３５質量％以下とすることができる。組成Ａ－３では、アルカリ金属酸化物の含有率の合計とＭｇＯおよびＣａＯの含有率の合計とが適切な範囲にあることによって、失透温度の過度な上昇を抑制しながら、ガラスの失透温度および熔融時の粘度をガラス組成物の製造に適した範囲とすることができる。また、ガラスの高い耐酸性を確保できる。（ＭｇＯ＋ＣａＯ）の下限は、１３質量％以上でありうるし、１４質量％超、１５質量％以上、１６質量％以上、さらには１７質量％超でありうる。（ＭｇＯ＋ＣａＯ）の上限は、３０質量％以下でありうるし、２８質量％以下、２６質量％以下、２５質量％以下、さらには２４質量％以下でありうる。 (MgO+CaO)
When emphasizing the ease of molding of the glass composition in composition A-3, the sum of the contents of MgO and CaO (MgO+CaO) can be set to 11% by mass or more and 35% by mass or less. In composition A-3, the total content of alkali metal oxides and the total content of MgO and CaO are in appropriate ranges, so that the devitrification temperature of the glass can be suppressed while suppressing an excessive rise in the devitrification temperature. The temperature and viscosity at the time of melting can be set within a range suitable for producing a glass composition. Moreover, high acid resistance of the glass can be ensured. The lower limit of (MgO+CaO) may be 13% by mass or more, more than 14% by mass, 15% by mass or more, 16% by mass or more, and even more than 17% by mass. The upper limit of (MgO+CaO) may be 30% by mass or less, 28% by mass or less, 26% by mass or less, 25% by mass or less, or even 24% by mass or less.
　（ＳｒＯ）
　組成Ａ－３はＳｒＯをさらに含有しうる。組成Ａ－３においてＳｒＯの含有率は組成Ａ－２と同様の上限および下限を有しうる。組成Ａ－３はＳｒＯを実質的に含有しなくてもよい。 (SrO)
Composition A-3 may further contain SrO. In composition A-3, the SrO content can have the same upper and lower limits as composition A-2. Composition A-3 may be substantially free of SrO.
　（ＢａＯ）
　組成Ａ－３はＢａＯをさらに含有しうる。組成Ａ－３においてＢａＯの含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－３はＢａＯを実質的に含有しなくてもよい。 (BaO)
Composition A-3 may further contain BaO. In composition A-3, the content of BaO may have the same upper and lower limits as in composition A-1. Composition A-3 may be substantially free of BaO.
　（ＺｎＯ）
　組成Ａ－３はＺｎＯをさらに含有しうる。組成Ａ－３においてＺｎＯの含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－３はＺｎＯを実質的に含有しなくてもよい。 (ZnO)
Composition A-3 may further contain ZnO. In composition A-3, the ZnO content can have the same upper and lower limits as composition A-1. Composition A-3 may be substantially free of ZnO.
　（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）
　組成Ａ－３において、アルカリ金属酸化物の含有率の合計（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）は４質量％より大きく９質量％未満である。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の下限は、４．５質量％以上でありうるし、５質量％以上でありうる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の上限は、８．５質量％以下でありうるし、８質量％以下、７．５質量％以下、さらに７質量％以下でありうる。Ｌｉ2Ｏ、Ｎａ2Ｏ、およびＫ2Ｏのそれぞれは任意成分である。言い換えるとこれらの各成分の含有率の下限は０であってもよい。 (Li 2 O, Na 2 O, K 2 O)
In composition A-3, the total content of alkali metal oxides (Li 2 O+Na 2 O+K 2 O) is greater than 4% by mass and less than 9% by mass. The lower limit of (Li 2 O+Na 2 O+K 2 O) may be 4.5% by mass or more, or 5% by mass or more. The upper limit of (Li 2 O+Na 2 O+K 2 O) may be 8.5% by mass or less, 8% by mass or less, 7.5% by mass or less, and further 7% by mass or less. Each of Li 2 O, Na 2 O, and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be zero.
　組成Ａ－３では、Ｌｉ2Ｏが、上述したアルカリ金属酸化物に基づく効果について特に高い寄与を示す。この観点からは、組成Ａ－３におけるＬｉ2Ｏの含有率の下限は、０．１質量％以上でありうるし、０．５質量％以上、さらには１質量％以上でありうる。Ｌｉ2Ｏの含有率の上限は、３質量％以下でありうるし、２質量％以下でありうる。 In composition A-3, Li 2 O makes a particularly high contribution to the effect based on the alkali metal oxide described above. From this point of view, the lower limit of the Li 2 O content in composition A-3 may be 0.1% by mass or more, 0.5% by mass or more, or even 1% by mass or more. The upper limit of the content of Li 2 O may be 3% by mass or less, or 2% by mass or less.
　組成Ａ－３において、Ｎａ2Ｏの含有率の下限は、０．１質量％以上でありうるし、０．２質量％以上、０．５質量％以上、１質量％以上、１．５質量％以上、さらに２質量％以上でありうる。Ｎａ2Ｏの含有率の上限は、８質量％以下、７質量％以下、さらに６質量％以下でありうる。 In composition A-3, the lower limit of the content of Na 2 O may be 0.1% by mass or more, 0.2% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.5% by mass. In addition to the above, the content may be 2% by mass or more. The upper limit of the content of Na 2 O may be 8% by mass or less, 7% by mass or less, and further 6% by mass or less.
　組成Ａ－３において、Ｋ2Ｏの含有率の下限は、０．１質量％以上でありうるし、０．２質量％以上、０．３質量％以上でありうる。Ｋ2Ｏの含有率の上限は、３質量％以下でありうるし、２質量％以下、さらには１質量％以下でありうる。 In composition A-3, the lower limit of the content of K 2 O may be 0.1% by mass or more, 0.2% by mass or more, or 0.3% by mass or more. The upper limit of the content of K 2 O may be 3% by mass or less, 2% by mass or less, and even 1% by mass or less.
　（ＴｉＯ2）
　組成Ａ－３はＴｉＯ2をさらに含有しうる。組成Ａ－３においてＴｉＯ2の含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－３はＴｉＯ2を実質的に含有しなくてもよい。 ( TiO2 )
Composition A-3 may further contain TiO 2 . In composition A-3, the content of TiO 2 can have the same upper and lower limits as in composition A-1. Composition A-3 may be substantially free of TiO 2 .
　（ＺｒＯ2）
　組成Ａ－３はＺｒＯ2をさらに含有しうる。組成Ａ－３においてＺｒＯ2の含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－３はＺｒＯ2を実質的に含有しなくてもよい。 ( ZrO2 )
Composition A-3 may further contain ZrO 2 . In composition A-3, the content of ZrO 2 can have the same upper and lower limits as composition A-1. Composition A-3 may be substantially free of ZrO 2 .
　（Ｆｅ）（Ｆ2、Ｃｌ2）
　組成Ａ－３は上記各成分をさらに含有しうる。これら各成分の好ましい含有率その他は、組成Ａ－１と同様であるため、記載を省略する。 (Fe) (F 2 , Cl 2 )
Composition A-3 may further contain each of the above components. The preferred contents and other details of each of these components are the same as those for composition A-1, so their description will be omitted.
　（組成Ａ－４）
　組成Ａ－４は、質量％表示で以下の成分を含有する。
　　６０≦ＳｉＯ2≦７５、
　　　０≦Ｂ2Ｏ3≦４、
　　　５≦Ａｌ2Ｏ3≦１５、
　４７≦（ＳｉＯ2－Ａｌ2Ｏ3）≦６０、
　　　５≦ＣａＯ≦２０、
　　　６≦Ｎａ2Ｏ≦２０、
　　　９≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０
　　　０≦Ｔ－Ｆｅ2Ｏ3≦５ (Composition A-4)
Composition A-4 contains the following components expressed in mass %.
60≦SiO 2 ≦75,
0≦B 2 O 3 ≦4,
5≦Al 2 O 3 ≦15,
47≦(SiO 2 -Al 2 O 3 )≦60,
5≦CaO≦20,
6≦Na 2 O≦20,
9≦( Li2O + Na2O + K2O )≦20
0≦T-Fe 2 O 3 ≦5
　ガラス組成Ａ－４を有するガラス組成物は、さらに、耐熱性および化学的耐久性に優れる。 The glass composition having glass composition A-4 further has excellent heat resistance and chemical durability.
　ガラス組成Ａ－４における各成分について、以下に説明する。ただし、各成分の役割について、ガラス組成Ａ－１～Ａ－３と重複する記載は割愛する。
　（ＳｉＯ2）
　ＳｉＯ2は、組成Ａ－４においても主成分である。組成Ａ－４において、ＳｉＯ2の含有率は、組成Ａ－３と同様の上限及び下限を有しうる。 Each component in glass composition A-4 will be explained below. However, regarding the role of each component, descriptions that overlap with the glass compositions A-1 to A-3 will be omitted.
( SiO2 )
SiO 2 is also the main component in composition A-4. In composition A-4, the content of SiO 2 can have the same upper and lower limits as composition A-3.
　（Ｂ2Ｏ3）
　組成Ａ－４において、Ｂ2Ｏ3の含有率は、組成Ａ－３と同様の上限及び下限を有しうる。 (B 2 O 3 )
In composition A-4, the content of B 2 O 3 can have the same upper and lower limits as composition A-3.
　（Ａｌ2Ｏ3）
　組成Ａ－４において、Ａｌ2Ｏ3の含有率は、組成Ａ－１と同様の上限及び下限を有しうる。 ( Al2O3 )
In composition A-4, the content of Al 2 O 3 can have the same upper and lower limits as composition A-1.
　（ＳｉＯ2－Ａｌ2Ｏ3）
　組成Ａ－４では、ガラスの耐酸性向上の観点から、ＳｉＯ2の含有率からＡｌ2Ｏ3の含有率を引いた値（ＳｉＯ2－Ａｌ2Ｏ3）は、組成Ａ－３と同様の上限及び下限を有しうる。 (SiO 2 -Al 2 O 3 )
In composition A-4, from the viewpoint of improving the acid resistance of the glass, the value obtained by subtracting the content of Al 2 O 3 from the content of SiO 2 (SiO 2 -Al 2 O 3 ) is the same as that of composition A-3. It can have an upper limit and a lower limit.
　（ＭｇＯ、ＣａＯ）
　組成Ａ－４はＭｇＯをさらに含有しうる。ただし、組成Ａ－４においてＭｇＯの含有は必須ではない。ＭｇＯの含有率の下限は、０質量％以上、０．１質量％以上、０．５質量％以上、１質量％以上、１．５質量％以上、さらには２質量％以上でありうる。ＭｇＯの含有率の上限は、１０質量％以下でありうるし、８質量％以下、６質量％以下、５質量％以下、さらには４質量％以下でありうる。 (MgO, CaO)
Composition A-4 may further contain MgO. However, the inclusion of MgO in composition A-4 is not essential. The lower limit of the content of MgO may be 0% by mass or more, 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, or even 2% by mass or more. The upper limit of the content of MgO may be 10% by mass or less, 8% by mass or less, 6% by mass or less, 5% by mass or less, and even 4% by mass or less.
　組成Ａ－４において、ＣａＯの含有率は５質量％以上２０質量％以下である。ＣａＯの含有率の下限は、６質量％以上でありうるし、７質量％以上、８質量％以上、９質量％以上、さらには１０質量％以上でありうる。ＣａＯの含有率の上限は、１８質量％以下でありうるし、１７質量％以下、１６質量％以下、さらには１５質量％以下でありうる。 In composition A-4, the content of CaO is 5% by mass or more and 20% by mass or less. The lower limit of the content of CaO may be 6% by mass or more, 7% by mass or more, 8% by mass or more, 9% by mass or more, or even 10% by mass or more. The upper limit of the content of CaO may be 18% by mass or less, 17% by mass or less, 16% by mass or less, and even 15% by mass or less.
（ＭｇＯ＋ＣａＯ）
　組成Ａ－４においてガラス組成物の成形し易さを重視する場合、ＭｇＯおよびＣａＯの含有率の和（ＭｇＯ＋ＣａＯ）を５質量％以上３０質量％以下とすることができる。組成Ａ－４では、アルカリ金属酸化物の含有率の合計とＭｇＯおよびＣａＯの含有率の和とが適切な範囲にあることによって、失透温度の過度な上昇を抑制しながら、ガラスの失透温度および熔融時の粘度をガラス組成物の製造に適した範囲とすることができる。また、ガラスの高い耐酸性を確保できる。（ＭｇＯ＋ＣａＯ）の下限は、６質量％以上でありうるし、８質量％以上、９質量％以上、１０質量％以上、１１質量％以上、１２質量％以上、さらには１３質量％以上でありうる。（ＭｇＯ＋ＣａＯ）の上限は、２６質量％以下でありうるし、２３質量％以下、２２質量％以下、２１質量％以下、２０質量％以下、１９質量％以下、さらには１８質量％以下でありうる。 (MgO+CaO)
In composition A-4, when the ease of molding of the glass composition is important, the sum of the contents of MgO and CaO (MgO+CaO) can be set to 5% by mass or more and 30% by mass or less. In composition A-4, the sum of the content of alkali metal oxides and the sum of the contents of MgO and CaO is in an appropriate range, so that the devitrification temperature of the glass can be suppressed while suppressing an excessive rise in the devitrification temperature. The temperature and viscosity at the time of melting can be set within a range suitable for producing a glass composition. Moreover, high acid resistance of the glass can be ensured. The lower limit of (MgO+CaO) may be 6% by mass or more, 8% by mass or more, 9% by mass or more, 10% by mass or more, 11% by mass or more, 12% by mass or more, and even 13% by mass or more. The upper limit of (MgO+CaO) may be 26% by mass or less, 23% by mass or less, 22% by mass or less, 21% by mass or less, 20% by mass or less, 19% by mass or less, or even 18% by mass or less.
　（ＳｒＯ）
　組成Ａ－４はＳｒＯをさらに含有しうる。組成Ａ－４においてＳｒＯの含有率は組成Ａ－２と同様の上限および下限を有しうる。組成Ａ－４はＳｒＯを実質的に含有しなくてもよい。 (SrO)
Composition A-4 may further contain SrO. In composition A-4, the SrO content can have the same upper and lower limits as composition A-2. Composition A-4 may be substantially free of SrO.
　（ＢａＯ）
　組成Ａ－４はＢａＯをさらに含有しうる。組成Ａ－４においてＢａＯの含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－４はＢａＯを実質的に含有しなくてもよい。 (BaO)
Composition A-4 may further contain BaO. In composition A-4, the BaO content may have the same upper and lower limits as composition A-1. Composition A-4 may be substantially free of BaO.
　（ＺｎＯ）
　組成Ａ－４はＺｎＯをさらに含有しうる。組成Ａ－４においてＺｎＯの含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－４はＺｎＯを実質的に含有しなくてもよい。 (ZnO)
Composition A-4 may further contain ZnO. In composition A-4, the ZnO content can have the same upper and lower limits as composition A-1. Composition A-4 may be substantially free of ZnO.
　（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）
　組成Ａ－４において、アルカリ金属酸化物の含有率の合計（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）は９質量％以上２０質量％以下である。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の下限は、９．５質量％以上でありうるし、１０質量％以上でありうる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の上限は、１８質量％以下でありうるし、１６質量％以下、１５質量％未満、１４質量％以下、１３質量％以下、１２．５質量％以下、１２質量％以下でありうる。Ｌｉ2ＯおよびＫ2Ｏのそれぞれは任意成分である。言い換えるとこれらの各成分の含有率の下限は、アルカリ金属酸化物の含有率の合計が９質量％以上である限り、０であってもよい。 (Li 2 O, Na 2 O, K 2 O)
In composition A-4, the total content of alkali metal oxides (Li 2 O+Na 2 O+K 2 O) is 9% by mass or more and 20% by mass or less. The lower limit of (Li 2 O+Na 2 O+K 2 O) may be 9.5% by mass or more, or may be 10% by mass or more. The upper limit of (Li 2 O + Na 2 O + K 2 O) can be 18% by mass or less, 16% by mass or less, less than 15% by mass, 14% by mass or less, 13% by mass or less, 12.5% by mass or less, 12% by mass % or less. Each of Li 2 O and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be 0 as long as the total content of alkali metal oxides is 9% by mass or more.
　組成Ａ－４では、Ｌｉ2Ｏが、上述したアルカリ金属酸化物に基づく効果について特に高い寄与を示す。また、Ｌｉ2Ｏの含有によって、ガラス組成物を形成する際のガラス素地の作業温度を下げることができ、作業温度が下がるとガラス組成物が形成しやすくなり、その生産性が向上する。一方、過度のＬｉ2Ｏの含有は、ガラス転移温度を下げ、ガラスの耐熱性が低下する。組成Ａ－４におけるＬｉ2Ｏの含有率の下限は、０質量％以上でありうるし、０．１質量％以上、０．５質量％以上、さらには１質量％以上でありうる。Ｌｉ2Ｏの含有率の上限は、５質量％以下でありうるし、４質量％以下、３質量％以下、２質量％以下、さらには２質量％未満でありうる。 In composition A-4, Li 2 O makes a particularly high contribution to the effect based on the alkali metal oxide described above. In addition, the inclusion of Li 2 O can lower the working temperature of the glass substrate when forming the glass composition, and when the working temperature is lowered, the glass composition becomes easier to form, and its productivity improves. On the other hand, excessive inclusion of Li 2 O lowers the glass transition temperature and reduces the heat resistance of the glass. The lower limit of the content of Li 2 O in composition A-4 may be 0% by mass or more, 0.1% by mass or more, 0.5% by mass or more, or even 1% by mass or more. The upper limit of the content of Li 2 O may be 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, or even less than 2% by mass.
　Ｎａ2Ｏの含有率は、６質量％以上２０質量％以下である。Ｎａ2Ｏの含有率がこれらの範囲において、上述したアルカリ金属酸化物に基づく効果がより確実となる。Ｎａ2Ｏの含有率の下限は、７質量％以上でありうるし、さらには８質量％以上でありうる。Ｎａ2Ｏの含有率の上限は、１７質量％以下でありうるし、１６質量％以下、１５質量％未満、１４質量％以下、１３質量％以下、さらには１２質量％以下でありうる。 The content of Na 2 O is 6% by mass or more and 20% by mass or less. When the content of Na 2 O is within these ranges, the effect based on the alkali metal oxide described above becomes more reliable. The lower limit of the content of Na 2 O may be 7% by mass or more, and further may be 8% by mass or more. The upper limit of the content of Na 2 O may be 17% by mass or less, 16% by mass or less, less than 15% by mass, 14% by mass or less, 13% by mass or less, and even 12% by mass or less.
　組成Ａ－４においてＫ2Ｏの含有率の下限は、０質量％以上でありうるし、０．１質量％以上、さらには０．５質量％以上でありうる。Ｋ2Ｏの含有率の上限は、５質量％以下でありうるし、３質量％以下、２質量％以下、２質量％未満、さらには１質量％以下でありうる。 In composition A-4, the lower limit of the content of K 2 O may be 0% by mass or more, 0.1% by mass or more, or even 0.5% by mass or more. The upper limit of the content of K 2 O may be 5% by mass or less, 3% by mass or less, 2% by mass or less, less than 2% by mass, or even 1% by mass or less.
　（ＴｉＯ2）
　組成Ａ－４はＴｉＯ2をさらに含有しうる。組成Ａ－４においてＴｉＯ2の含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－４はＴｉＯ2を実質的に含有しなくてもよい。 ( TiO2 )
Composition A-4 may further contain TiO 2 . In composition A-4, the content of TiO 2 can have the same upper and lower limits as in composition A-1. Composition A-4 may be substantially free of TiO 2 .
　（ＺｒＯ2）
　組成Ａ－４はＺｒＯ2をさらに含有しうる。組成Ａ－４においてＺｒＯ2の含有率は組成Ａ－１と同様の上限および下限を有しうる。組成Ａ－４はＺｒＯ2を実質的に含有しなくてもよい。 ( ZrO2 )
Composition A-4 may further contain ZrO 2 . In composition A-4, the content of ZrO 2 can have the same upper and lower limits as composition A-1. Composition A-4 may be substantially free of ZrO 2 .
　（Ｆｅ）（Ｆ2、Ｃｌ2）
　組成Ａ－４は上記各成分をさらに含有しうる。これら各成分の好ましい含有率その他は、組成Ａ－１と同様であるため、記載を省略する。 (Fe) (F 2 , Cl 2 )
Composition A-4 may further contain each of the above components. The preferred contents and other details of each of these components are the same as those for composition A-1, so their description will be omitted.
（ガラス組成Ｂ）
　また、ガラス組成物の別の一例（以下、ガラス組成Ｂ）は、質量％で表示して、
　　　５０≦ＳｉＯ2≦７５、
　　　　０≦Ｂ2Ｏ3≦４、
　　０．１≦（ＭｇＯ＋ＣａＯ）≦２０、
　　　　９≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０、
　　　　５≦ＺｒＯ2≦２０、
　の成分を含有する。 (Glass composition B)
In addition, another example of the glass composition (hereinafter referred to as glass composition B) is expressed in mass%,
50≦SiO 2 ≦75,
0≦B 2 O 3 ≦4,
0.1≦(MgO+CaO)≦20,
9≦( Li2O + Na2O + K2O )≦20,
5≦ZrO 2 ≦20,
Contains the following ingredients.
　ガラス組成Ｂは、上述した各成分以外の成分を実質的に含有しなくてもよい。また、ガラス組成Ｂは、高い化学的耐久性を備えたガラス繊維となりうる。 Glass composition B does not need to contain substantially any components other than the above-mentioned components. Moreover, the glass composition B can be a glass fiber with high chemical durability.
　ガラス組成Ｂにおける各成分について、以下に説明する。
　（ＳｉＯ2）
　ＳｉＯ2は、ガラスの骨格を形成する成分であり、組成Ｂの主成分である。また、ＳｉＯ2は、ガラス形成時の失透温度および粘度を調整する成分であり。耐水性や耐酸性を向上させる成分である。ＳｉＯ2の含有率は、５０質量％以上７５質量％以下であるが、ＳｉＯ2の含有率の下限は、５２質量％以上でありうるし、５４質量％以上、５６質量％以上、５８質量％以上、６０質量％以上、６２質量％以上、６３質量％以上、６４質量％以上、６５質量％より大きく、さらには６６質量％より大きくてもよい。ＳｉＯ2の含有率の上限は、７４質量％以下でありうるし、７３質量％以下、７１質量％以下、さらには７０質量％以下でありうる。 Each component in glass composition B will be explained below.
( SiO2 )
SiO 2 is a component that forms the skeleton of glass and is the main component of composition B. Further, SiO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation. A component that improves water resistance and acid resistance. The content of SiO 2 is 50% by mass or more and 75% by mass or less, but the lower limit of the content of SiO 2 can be 52% by mass or more, 54% by mass or more, 56% by mass or more, 58% by mass or more. , 60% by mass or more, 62% by mass or more, 63% by mass or more, 64% by mass or more, more than 65% by mass, or even more than 66% by mass. The upper limit of the content of SiO 2 may be 74% by mass or less, 73% by mass or less, 71% by mass or less, or even 70% by mass or less.
　（Ｂ2Ｏ3）
　組成Ｂは、Ｂ2Ｏ3をさらに含有しうる。Ｂ2Ｏ3は、ガラスの骨格を形成する成分である。また、Ｂ2Ｏ3は、ガラス形成時の失透温度および粘度を調整する成分でもある。一方で、過度のＢ2Ｏ3の含有は、ガラスの耐酸性を低下させる。Ｂ2Ｏ3の含有率の上限は、４質量％以下でありうるし、３質量％以下、２質量％未満、１．５質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成ＢはＢ2Ｏ3を実質的に含有しなくてもよい。 (B 2 O 3 )
Composition B may further contain B 2 O 3 . B 2 O 3 is a component that forms the skeleton of glass. Moreover, B 2 O 3 is also a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, excessive content of B 2 O 3 lowers the acid resistance of the glass. The upper limit of the content of B 2 O 3 may be 4% by mass or less, 3% by mass or less, less than 2% by mass, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even It may be 0.1% by mass or less. Composition B may be substantially free of B 2 O 3 .
　（Ａｌ2Ｏ3）
　組成Ｂは、Ａｌ2Ｏ3をさらに含有しうる。Ａｌ2Ｏ3は、ガラスの骨格を形成する成分である。また、Ａｌ2Ｏ3は、ガラス形成時の失透温度および粘度を調整する成分でもあり、ガラスの耐水性を向上させる成分である。一方で、過度のＡｌ2Ｏ3の含有は、ガラスの耐酸性を低下させる。Ａｌ2Ｏ3の含有率の上限は、５質量％以下でありうるし、４質量％以下、３質量％以下、２質量％以下、さらには１．５質量％以下でありうる。 ( Al2O3 )
Composition B may further contain Al 2 O 3 . Al 2 O 3 is a component that forms the skeleton of glass. Furthermore, Al 2 O 3 is a component that adjusts the devitrification temperature and viscosity during glass formation, and is a component that improves the water resistance of the glass. On the other hand, excessive content of Al 2 O 3 lowers the acid resistance of the glass. The upper limit of the content of Al 2 O 3 may be 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, or even 1.5% by mass or less.
　（Ｂ2Ｏ3＋Ａｌ2Ｏ3）
　組成Ｂでは、ガラスの形成し易さおよび耐酸性を重視する場合、Ｂ2Ｏ3およびＡｌ2Ｏ3の含有率の和（Ｂ2Ｏ3＋Ａｌ2Ｏ3）が重要となりうる。組成Ｂにおいて（Ｂ2Ｏ3＋Ａｌ2Ｏ3）は５質量％以下でありうる。この場合、ガラスの製造が難しくなるようなガラスの失透温度の上昇が抑えられるとともに、ガラスの耐酸性が高くなる。また、ガラスの融点が過度に高くなることがなく、原料を熔融する際の均一性が増す。（Ｂ2Ｏ3＋Ａｌ2Ｏ3）の上限は、４質量％以下でありうるし、３質量％以下、２質量％以下、さらには１．５質量％未満でありうる。 (B 2 O 3 + Al 2 O 3 )
In composition B, when ease of forming the glass and acid resistance are important, the sum of the contents of B 2 O 3 and Al 2 O 3 (B 2 O 3 +Al 2 O 3 ) may be important. In composition B, (B 2 O 3 +Al 2 O 3 ) may be 5% by mass or less. In this case, an increase in the devitrification temperature of the glass, which would make it difficult to manufacture the glass, is suppressed, and the acid resistance of the glass is increased. Furthermore, the melting point of the glass does not become excessively high, and the uniformity of melting the raw materials increases. The upper limit of (B 2 O 3 +Al 2 O 3 ) may be 4% by mass or less, 3% by mass or less, 2% by mass or less, or even less than 1.5% by mass.
　（ＭｇＯ、ＣａＯ）
　組成ＢはＭｇＯをさらに含有しうる。ＭｇＯは、ガラス形成時の失透温度および粘度を調整する成分である。また、ＭｇＯは、ガラス組成物の耐酸性および耐水性を調整する成分でもある。ＭｇＯの含有率の下限は、０．１質量％以上でありうるし、０．５質量％以上、１質量％以上、１．５質量％以上、さらには２質量％より大きくてもよい。ＭｇＯの含有率の上限は、１５質量％以下でありうるし、１２質量％以下、１０質量％以下、８質量％以下、６質量％以下、さらには５質量％以下でありうる。 (MgO, CaO)
Composition B may further contain MgO. MgO is a component that adjusts the devitrification temperature and viscosity during glass formation. Moreover, MgO is also a component that adjusts the acid resistance and water resistance of the glass composition. The lower limit of the MgO content may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 1.5% by mass or more, or even more than 2% by mass. The upper limit of the content of MgO may be 15% by mass or less, 12% by mass or less, 10% by mass or less, 8% by mass or less, 6% by mass or less, or even 5% by mass or less.
　組成ＢはＣａＯをさらに含有しうる。ＣａＯは、ガラス形成時の失透温度および粘度を調整する成分である。また、ＣａＯは、ガラス組成物の耐酸性および耐水性を調整する成分でもある。ＣａＯの含有率の下限は、０．１質量％以上でありうるし、１質量％以上、２質量％以上、さらには３質量％より大きくてもよい。ＣａＯの含有率の上限は、１５質量％以下でありうるし、１２質量％以下、１０質量％以下、さらには８質量％以下でありうる。 Composition B may further contain CaO. CaO is a component that adjusts the devitrification temperature and viscosity during glass formation. CaO is also a component that adjusts the acid resistance and water resistance of the glass composition. The lower limit of the CaO content may be 0.1% by mass or more, 1% by mass or more, 2% by mass or more, or even more than 3% by mass. The upper limit of the CaO content may be 15% by mass or less, 12% by mass or less, 10% by mass or less, or even 8% by mass or less.
　組成Ｂにおいて、ＭｇＯおよびＣａＯの含有率の和（ＭｇＯ＋ＣａＯ）の値が０．１質量％以上２０質量％以下では、失透温度の過度な上昇を抑制しながら熔融ガラスの失透温度および粘度を、ガラスの製造に適した範囲とすることができる。また、この範囲ではガラスの化学的耐久性を向上させることも可能となる。（ＭｇＯ＋ＣａＯ）の下限は、２質量％以上でありうるし、４質量％以上、６質量％以上、８質量％以上、さらには９質量％以上でありうる。（ＭｇＯ＋ＣａＯ）の上限は、２０質量％以下でありうるし、１８質量％以下、１６質量％以下、１４質量％以下、さらには１３質量％以下でありうる。組成ＢにおいてＭｇＯおよびＣａＯのそれぞれは任意成分である。言い換えるとこれらの成分の含有率の下限は、その合計が０．１質量％以上である限り、０であってもよい。 In composition B, when the value of the sum of the contents of MgO and CaO (MgO+CaO) is 0.1% by mass or more and 20% by mass or less, the devitrification temperature and viscosity of the molten glass can be controlled while suppressing an excessive increase in the devitrification temperature. , the range suitable for glass production. Further, within this range, it is also possible to improve the chemical durability of the glass. The lower limit of (MgO+CaO) may be 2% by mass or more, 4% by mass or more, 6% by mass or more, 8% by mass or more, or even 9% by mass or more. The upper limit of (MgO+CaO) may be 20% by mass or less, 18% by mass or less, 16% by mass or less, 14% by mass or less, or even 13% by mass or less. In composition B, each of MgO and CaO is an optional component. In other words, the lower limit of the content of these components may be 0 as long as the total content is 0.1% by mass or more.
　（ＳｒＯ）
　組成ＢはＳｒＯをさらに含有しうる。ＳｒＯは、ガラス形成時の失透温度および粘度を調整する成分である。一方で、過度のＳｒＯの含有はガラスの耐酸性を低下させる。ＳｒＯの含有率の上限は、１０質量％以下でありうるし、５質量％以下、２質量％以下、１．５質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成ＢはＳｒＯを実質的に含有しなくてもよい。 (SrO)
Composition B may further contain SrO. SrO is a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, excessive SrO content reduces the acid resistance of the glass. The upper limit of the SrO content can be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less. % by mass or less. Composition B may be substantially free of SrO.
　（ＢａＯ）
　組成ＢはＢａＯをさらに含有しうる。ＢａＯは、ガラス形成時の失透温度および粘度を調整する成分である。一方で、過度のＢａＯの含有はガラスの耐酸性を低下させる。ＢａＯの含有率の上限は、１０質量％以下でありうるし、５質量％以下、２質量％以下、１．５質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成ＢはＢａＯを実質的に含有しなくてもよい。 (BaO)
Composition B may further contain BaO. BaO is a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, excessive BaO content reduces the acid resistance of the glass. The upper limit of the BaO content may be 10% by mass or less, 5% by mass or less, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less. % by mass or less. Composition B may be substantially free of BaO.
　（ＺｎＯ）
　組成ＢはＺｎＯをさらに含有しうる。ＺｎＯは、ガラス形成時の失透温度および粘度を調整する成分である。一方で、ＺｎＯは揮発しやすく、熔融時に飛散する可能性があるため、過度のＺｎＯの含有は、揮発によるガラス成分比の変動を顕著化させ、ガラス組成の管理を難しくする。またＺｎＯは、その原料が相対的に高価であることから、その含有率は低いほうがよい。ＺｎＯの含有率の上限は、１０質量％以下でありうるし、５質量％以下、３質量％未満、２質量％以下、１．５質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成ＢはＺｎＯを実質的に含有しなくてもよい。 (ZnO)
Composition B may further contain ZnO. ZnO is a component that adjusts the devitrification temperature and viscosity during glass formation. On the other hand, since ZnO is easily volatilized and may scatter during melting, excessive ZnO content causes significant fluctuations in the glass component ratio due to volatilization, making it difficult to manage the glass composition. Furthermore, since the raw material for ZnO is relatively expensive, the content thereof should be low. The upper limit of the content of ZnO may be 10% by mass or less, 5% by mass or less, less than 3% by mass, 2% by mass or less, 1.5% by mass or less, 1% by mass or less, 0.5% by mass or less, Furthermore, it may be 0.1% by mass or less. Composition B may be substantially free of ZnO.
　（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）
　アルカリ金属酸化物（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）は、組成Ｂにおいて、ガラス形成時の失透温度および粘度を調整する成分である。また、アルカリ金属酸化物（Ｌｉ2Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ）は、ガラスの耐酸性および耐水性を調整する成分でもある。Ｌｉ2ＯおよびＫ2Ｏは、それぞれ任意成分である。言い換えるとこれらの各成分の含有率の下限は０であってもよい。 (Li 2 O, Na 2 O, K 2 O)
Alkali metal oxides (Li 2 O, Na 2 O, K 2 O) are components in composition B that adjust the devitrification temperature and viscosity during glass formation. Further, the alkali metal oxides (Li 2 O, Na 2 O, K 2 O) are also components that adjust the acid resistance and water resistance of the glass. Li 2 O and K 2 O are each optional components. In other words, the lower limit of the content of each of these components may be zero.
　Ｌｉ2Ｏの含有率の下限は、０．１質量％以上でありうるし、０．５質量％以上、１質量％以上、１．５質量％以上でありうる。Ｌｉ2Ｏの含有率の上限は、５質量％以下でありうるし、４質量％以下、３．５質量％以下、さらには３質量％以下でありうる。 The lower limit of the content of Li 2 O may be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, or 1.5% by mass or more. The upper limit of the content of Li 2 O may be 5% by mass or less, 4% by mass or less, 3.5% by mass or less, or even 3% by mass or less.
　Ｎａ2Ｏの含有率の下限は、０．１質量％以上でありうるし、１質量％以上、３質量％以上でありうる。Ｎａ2Ｏの含有率は６質量％以上２０質量％以下でありうる。この場合、失透温度の過度な上昇を抑制しながら熔融ガラスの失透温度および粘度を、ガラスの製造に適した範囲とすることができる。また、ガラスの融点の上昇を抑え、ガラス原料のより均一な熔融を実施できながらも、ガラス転移温度が過度に低下することなく、高いガラスの耐熱性を確保できる。さらに、この範囲ではガラスの化学的耐久性を向上させることも可能となる。Ｎａ2Ｏの下限は、７質量％以上でありうるし、７．５質量％以上、さらには８質量％以上でありうる。Ｎａ2Ｏの上限は、１８質量％以下でありうるし、１６質量％以下、１５質量％以下、１４質量％以下、１３質量％以下、さらには１２質量％以下でありうる。 The lower limit of the content of Na 2 O may be 0.1% by mass or more, 1% by mass or more, or 3% by mass or more. The content of Na 2 O may be 6% by mass or more and 20% by mass or less. In this case, the devitrification temperature and viscosity of the molten glass can be controlled to be within a range suitable for glass production while suppressing an excessive increase in the devitrification temperature. Further, while suppressing the increase in the melting point of the glass and achieving more uniform melting of the glass raw materials, high heat resistance of the glass can be ensured without excessively lowering the glass transition temperature. Furthermore, within this range, it is also possible to improve the chemical durability of the glass. The lower limit of Na 2 O may be 7% by mass or more, 7.5% by mass or more, or even 8% by mass or more. The upper limit of Na 2 O may be 18% by mass or less, 16% by mass or less, 15% by mass or less, 14% by mass or less, 13% by mass or less, or even 12% by mass or less.
　Ｋ2Ｏの含有率の下限は、０．１質量％以上でありうるし、０．５質量％より大きくてもよい。組成ＢにおいてＫ2Ｏの含有率の上限は、１０質量％以下、５質量％以下でありうるし、４質量％未満、３質量％以下、さらには２質量％未満でありうる。 The lower limit of the content of K 2 O may be 0.1% by mass or more, and may be greater than 0.5% by mass. In composition B, the upper limit of the content of K 2 O may be 10% by mass or less, 5% by mass or less, less than 4% by mass, 3% by mass or less, and even less than 2% by mass.
　組成Ｂにおいて、アルカリ金属酸化物の含有率の合計（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の値が９質量％以上２０質量％以下では、失透温度の過度な上昇を抑制しながら熔融ガラスの失透温度および粘度を、ガラスの製造に適した範囲とすることができる。また、ガラスの融点の上昇を抑え、ガラス原料のより均一な熔融を実施できながらも、ガラス転移温度が過度に低下することなく、高いガラスの耐熱性を確保できる。さらに、この範囲ではガラスの化学的耐久性を向上させることも可能となる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の下限は、９．５質量％以上でありうるし、１０質量％以上でありうる。（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）の上限は、１８質量％以下でありうるし、１６質量％以下、１５質量％以下、１４質量％以下、１３質量％未満、さらには１２質量％未満でありうる。Ｌｉ2Ｏ、Ｎａ2ＯおよびＫ2Ｏのそれぞれは任意成分である。言い換えるとこれらの各成分の含有率の下限は、アルカリ金属酸化物の含有率の合計が９質量％以上である限り、０であってもよい。 In composition B, when the total content of alkali metal oxides (Li 2 O + Na 2 O + K 2 O) is 9% by mass or more and 20% by mass or less, the devitrification temperature is suppressed and the molten glass is not devitrified excessively. The transmission temperature and viscosity can be set in a range suitable for glass production. Further, while suppressing the increase in the melting point of the glass and achieving more uniform melting of the glass raw materials, high heat resistance of the glass can be ensured without excessively lowering the glass transition temperature. Furthermore, within this range, it is also possible to improve the chemical durability of the glass. The lower limit of (Li 2 O+Na 2 O+K 2 O) may be 9.5% by mass or more, or may be 10% by mass or more. The upper limit of (Li 2 O + Na 2 O + K 2 O) may be 18% by mass or less, 16% by mass or less, 15% by mass or less, 14% by mass or less, less than 13% by mass, or even less than 12% by mass. . Each of Li 2 O, Na 2 O and K 2 O is an optional component. In other words, the lower limit of the content of each of these components may be 0 as long as the total content of alkali metal oxides is 9% by mass or more.
　（ＴｉＯ2）
　ガラス組成ＢはＴｉＯ2をさらに含有しうる。ＴｉＯ2は、ガラスの熔融性および化学的耐久性を向上させる成分である。ただしＴｉＯ2は、その原料が相対的に高価であることから、その含有率は低いほうがよい。ＴｉＯ2の含有率の上限は、５質量％以下でありうるし、２質量％以下、１質量％以下、０．５質量％以下、さらには０．１質量％以下でありうる。組成ＢはＴｉＯ2を実質的に含有しなくてもよい。 ( TiO2 )
Glass composition B may further contain TiO2 . TiO 2 is a component that improves the meltability and chemical durability of glass. However, since the raw material for TiO 2 is relatively expensive, the content thereof should be lower. The upper limit of the content of TiO 2 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, and even 0.1% by mass or less. Composition B may be substantially free of TiO2 .
　（ＺｒＯ2）
　ＺｒＯ2は、ガラス形成時の失透温度および粘度を調整する成分である。また、ＺｒＯ2は、ガラス組成物の耐酸性および耐水性を調整する成分でもある。さらに、ＺｒＯ2は、ヤング率を向上させる成分でもある。組成ＢにおいてＺｒＯ2の含有率が５質量％以上２０質量％以下では、ガラスの製造が難しくなるようなガラスの失透温度の上昇が抑えられるとともに、ガラスの耐水性や耐酸性が高くなる。ただしＺｒＯ2は、その原料が相対的に高価であることから、その含有率は低いほうがよい。ＺｒＯ2の含有率の下限は、５質量％より大きく、５．５質量％以上、６質量％以上、６．５質量％以上、さらには７質量％以上でありうる。ＺｒＯ2の含有率の上限は、１８質量％以下でありうるし、１５質量％以下、１２質量％以下、１０質量％以下、９．５質量％以下、９質量％以下、８．５質量％以下、さらには８質量％以下でありうる。 ( ZrO2 )
ZrO 2 is a component that adjusts the devitrification temperature and viscosity during glass formation. ZrO 2 is also a component that adjusts the acid resistance and water resistance of the glass composition. Furthermore, ZrO 2 is also a component that improves Young's modulus. When the content of ZrO 2 in composition B is 5% by mass or more and 20% by mass or less, an increase in the devitrification temperature of the glass, which would make it difficult to manufacture the glass, is suppressed, and the water resistance and acid resistance of the glass are increased. However, since the raw material for ZrO 2 is relatively expensive, the content thereof should be lower. The lower limit of the content of ZrO 2 is greater than 5% by mass, and may be 5.5% by mass or more, 6% by mass or more, 6.5% by mass or more, or even 7% by mass or more. The upper limit of the content of ZrO 2 can be 18% by mass or less, 15% by mass or less, 12% by mass or less, 10% by mass or less, 9.5% by mass or less, 9% by mass or less, 8.5% by mass or less , or even 8% by mass or less.
　（Ｆｅ）
　ガラス組成物中に含まれる鉄（Ｆｅ）は、通常、Ｆｅ2+またはＦｅ3+の状態で存在する。Ｆｅ3+はガラス組成物の紫外線吸収特性を高める成分であり、Ｆｅ2+はガラス組成物の熱線吸収特性を高める成分である。Ｆｅは、意図的に含ませなくとも、工業用原料により不可避的に混入する場合がある。Ｆｅの含有量が少なければ、ガラス組成物の着色を防止することができる。Ｆｅの含有率の上限は、Ｔ－Ｆｅ2Ｏ3により表示して５質量％以下でありうるし、２質量％以下、１質量％以下、０．５質量％以下、０．４質量％以下、０．３質量％以下、０．２質量％以下、さらには０．１質量％以下、０．１質量％未満、０．０８質量％以下、０．０５質量％以下、０．０４質量％以下、さらには０．０３質量％以下でありうる。Ｆｅの含有率の下限は、Ｔ－Ｆｅ2Ｏ3により表示して０．０１質量％以上、０．０５質量％以上、０．１質量％以上、さらに０．２質量％以上でありうる。特にアルカリ金属酸化物の含有率が低いガラス組成において、微量の酸化鉄はガラスの清澄の促進に寄与しうる。 (Fe)
Iron (Fe) contained in the glass composition usually exists in the form of Fe 2+ or Fe 3+ . Fe 3+ is a component that enhances the ultraviolet absorption properties of the glass composition, and Fe 2+ is a component that enhances the heat ray absorption properties of the glass composition. Even if Fe is not intentionally included, it may be unavoidably mixed in with industrial raw materials. If the content of Fe is small, coloring of the glass composition can be prevented. The upper limit of the content of Fe expressed by T-Fe 2 O 3 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3 mass% or less, 0.2 mass% or less, further 0.1 mass% or less, less than 0.1 mass%, 0.08 mass% or less, 0.05 mass% or less, 0.04 mass% or less , and even 0.03% by mass or less. The lower limit of the content of Fe expressed by T-Fe 2 O 3 may be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, and further 0.2% by mass or more. Particularly in glass compositions with a low content of alkali metal oxides, trace amounts of iron oxide can contribute to promoting glass fining.
　（Ｆ2、Ｃｌ2）
　組成Ｂはフッ素（Ｆ2）および塩素（Ｃｌ2）をさらに含有しうる。Ｆ2は、揮発し易いため、溶融時に飛散する可能性があるとともに、ガラス中の含有量を管理し難いという問題もある。Ｆ2の含有率の上限は、５質量％以下でありうるし、２質量％以下、１質量％以下、０．５質量％以下、０．２質量％以下、さらには０．１質量％以下でありうる。Ｆ2は、実質的に含まれていなくてもよい。 ( F2 , Cl2 )
Composition B may further contain fluorine (F 2 ) and chlorine (Cl 2 ). Since F 2 easily volatizes, there is a possibility of it scattering during melting, and there is also the problem that it is difficult to control the content in the glass. The upper limit of the content of F2 can be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.2% by mass or less, and even 0.1% by mass or less. It's possible. F 2 may be substantially absent.
　Ｃｌ2は、揮発し易いため、溶融時に飛散する可能性があるとともに、ガラス中の含有量を管理し難いという問題もある。Ｃｌ2の含有率の上限は、５質量％以下でありうるし、２質量％以下、１質量％以下、０．５質量％以下、０．２質量％以下、さらには０．１質量％以下でありうる。Ｃｌ2は、実質的に含まれていなくてもよい。 Since Cl 2 easily volatizes, there is a possibility of it scattering during melting, and there is also the problem that it is difficult to control the content in the glass. The upper limit of the content of Cl 2 may be 5% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, 0.2% by mass or less, and even 0.1% by mass or less. It's possible. Cl 2 may be substantially free.
　ガラス組成Ａおよびガラス組成Ｂは、本発明の効果が得られる限り、さらに下記の成分を含有しうる。 Glass composition A and glass composition B may further contain the following components as long as the effects of the present invention can be obtained.
　（その他の成分）
　ガラス組成Ａおよびガラス組成Ｂは、その他の成分として、Ｐ2Ｏ5、Ｓｃ2Ｏ3、Ｙ2Ｏ3、Ｌａ2Ｏ3、ＣｅＯ2、Ｐｒ2Ｏ3、Ｎｄ2Ｏ3、Ｐｍ2Ｏ3、Ｓｍ2Ｏ3、Ｅｕ2Ｏ3、Ｇｄ2Ｏ3、Ｔｂ2Ｏ3、Ｄｙ2Ｏ3、Ｈｏ2Ｏ3、Ｅｒ2Ｏ3、Ｔｍ2Ｏ3、Ｙｂ2Ｏ3、Ｌｕ2Ｏ3、ＷＯ3、Ｎｂ2Ｏ5、Ｙ2Ｏ3、ＭｏＯ3、Ｔａ2Ｏ5、ＭｎＯ2およびＣｒ2Ｏ3から選ばれる少なくとも１種を、それぞれ０質量％以上５質量％以下の含有率で含有しうる。これらの成分の許容される含有率は、それぞれについて２質量％未満でありうるし、１質量％未満、０．５質量％未満、さらには０．１質量％未満でありうる。これらの成分の許容される含有率の合計は、５質量％以下でありうるし、２％質量％未満、１質量％未満、０．５質量％未満、さらには０．１質量％未満でありうる。ただし、上記その他の成分は、それぞれ実質的に含有されていなくてもよい。また、ライタノイド（Ｌａ、Ｃｅ、Ｐｒ、Ｎｄ、Ｐｍ、Ｓｍ、Ｅｕ、Ｇｄ、Ｔｂ、Ｄｙ、Ｈｏ、Ｅｒ、Ｔｍ、Ｙｂ、Ｌｕ）の酸化物は、実質的に含有されていなくてもよい。 (Other ingredients)
Glass composition A and glass composition B include P 2 O 5 , Sc 2 O 3 , Y 2 O 3 , La 2 O 3 , CeO 2 , Pr 2 O 3 , Nd 2 O 3 , Pm 2 O as other components. 3 , Sm2O3 , Eu2O3 , Gd2O3 , Tb2O3 , Dy2O3 , Ho2O3 , Er2O3 , Tm2O3 , Yb2O3 , Lu2O 3 , WO 3 , Nb 2 O 5 , Y 2 O 3 , MoO 3 , Ta 2 O 5 , MnO 2 and Cr 2 O 3 at a content of 0% by mass or more and 5% by mass or less, respectively. It can be contained in The permissible content of these components may be less than 2% by weight each, less than 1% by weight, less than 0.5% by weight, or even less than 0.1% by weight. The total allowable content of these components may be 5% by weight or less, less than 2% by weight, less than 1% by weight, less than 0.5% by weight, or even less than 0.1% by weight. . However, the other components mentioned above may not be substantially contained. Furthermore, oxides of litanoid (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) may not be substantially contained.
　また、ガラス組成Ａおよびガラス組成Ｂは、添加物として、ＳＯ3、Ｂｒ2、Ｉ2、ＳｎＯ2、Ａｓ2Ｏ3およびＳｂ2Ｏ3から選ばれる少なくとも１種を、それぞれ０質量％以上１質量％以下の含有率で含有しうる。これらの成分の許容される含有率は、それぞれについて０．５質量％未満でありうるし、０．２質量％未満、さらには０．１質量％未満でありうる。これらの成分の許容される含有率の合計は、１質量％以下でありうるし、０．５％質量％未満、０．２質量％未満、さらには０．１質量％未満でありうる。ただし、上記その他の成分は、それぞれ実質的に含有されていなくてもよい。 Glass composition A and glass composition B each contain at least one kind selected from SO 3 , Br 2 , I 2 , SnO 2 , As 2 O 3 and Sb 2 O 3 as an additive in an amount of 0% by mass or more and 1% by mass. It can be contained in a content of % by mass or less. The permissible content of these components can be less than 0.5% by weight, less than 0.2% by weight, or even less than 0.1% by weight for each. The total allowable content of these components may be 1% by weight or less, less than 0.5% by weight, less than 0.2% by weight, or even less than 0.1% by weight. However, the other components mentioned above may not be substantially contained.
　ガラス組成Ａおよびガラス組成Ｂは、Ｈ2Ｏ、ＯＨ、Ｈ2、ＣＯ2、ＣＯ、Ｈｅ、Ｎｅ、ＡｒおよびＮ2を、それぞれ０質量％以上０．１質量％以下の含有率で含有しうる。これらの成分の許容される含有率は、それぞれについて０．０５質量％未満でありうるし、０．０３質量％未満、さらには０．０１質量％未満でありうる。これらの成分の許容される含有率の合計は、０．１質量％以下でありうるし、０．０５％質量％未満、０．０３質量％未満、さらには０．０１質量％未満でありうる。ただし、上記その他の成分は、それぞれ実質的に含まれていなくてもよい。 Glass composition A and glass composition B each contain H 2 O, OH, H 2 , CO 2 , CO, He, Ne, Ar, and N 2 at a content of 0% by mass or more and 0.1% by mass or less. sell. The permissible content of these components can be less than 0.05% by weight, less than 0.03% by weight, or even less than 0.01% by weight for each. The total allowable content of these components can be 0.1% by weight or less, less than 0.05% by weight, less than 0.03% by weight, and even less than 0.01% by weight. However, the other components mentioned above may not be substantially contained.
　ガラス組成Ａおよびガラス組成Ｂは、微量の貴金属元素を含有していてもよい。例えば、Ｐｔ、Ｒｈ、Ａｕ、Ｏｓなどの貴金属元素を、それぞれ０質量％以上０．１質量％以下の含有率で含むことができる。これらの成分の許容される含有率は、それぞれについて０．１質量％未満でありうるし、０．０５質量％未満、０．０３質量％未満、さらには０．０１質量％未満でありうる。これらの成分の許容される含有率の合計は、０．１質量％以下でありうるし、０．０５％質量％未満、０．０３質量％未満、さらには０．０１質量％未満でありうる。ただし、上記その他の成分は、それぞれ実質的に含有されていなくてもよい。 Glass composition A and glass composition B may contain trace amounts of noble metal elements. For example, noble metal elements such as Pt, Rh, Au, and Os can be included at a content of 0% by mass or more and 0.1% by mass or less, respectively. The permissible content of these components may be less than 0.1% by weight each, less than 0.05% by weight, less than 0.03% by weight, or even less than 0.01% by weight. The total allowable content of these components can be 0.1% by weight or less, less than 0.05% by weight, less than 0.03% by weight, and even less than 0.01% by weight. However, the other components mentioned above may not be substantially contained.
　ガラス組成Ａおよびガラス組成Ｂは、ＣｕＯを実質的に含有しない組成でありうる。また、ガラス組成Ａおよびガラス組成Ｂは、ＣｏＯを実質的に含有しない組成でありうる。さらに、ガラス組成Ａおよびガラス組成Ｂは、ＰｂＯを実質的に含有しない組成でありうる。また、ガラス組成Ａおよびガラス組成Ｂは、ＮｉＯを実質的に含有しない組成でありうる。 Glass composition A and glass composition B may be compositions that do not substantially contain CuO. Moreover, the glass composition A and the glass composition B may be compositions that do not substantially contain CoO. Furthermore, glass composition A and glass composition B may be compositions that do not substantially contain PbO. Moreover, the glass composition A and the glass composition B may be compositions that do not substantially contain NiO.
　＜特性＞
　本発明のガラスがとりうる特性について、以下、説明する。
　（熔融特性）
　熔融ガラスの粘度が１０００ｄＰａ・ｓｅｃ（１０００ｐｏｉｓｅ）となるときの温度は、当該ガラスの作業温度と呼ばれ、ガラスの成形に最も適する温度である。ガラス繊維を製造する場合、ガラスの作業温度が１１００℃以上であれば、ガラス繊維径のばらつきを小さくできる。作業温度が１３００℃以下であれば、ガラスを熔融する際の燃料費を低減でき、ガラス製造装置が熱による腐食を受け難くなり、装置寿命が延びる。作業温度の下限は、１１００℃以上でありうるし、１１２０℃以上、１１４０℃以上、１１５０℃以上、１１６０℃以上、１１７０℃以上、１１８０℃以上、さらには１２００℃以上でありうる。作業温度の上限は、１３００℃以下でありうるし、１２８０℃以下、１２７０℃以下、１２６０℃以下、さらには１２５０℃以下でありうる。 <Characteristics>
The characteristics that the glass of the present invention can have will be explained below.
(melting characteristics)
The temperature at which the viscosity of the molten glass becomes 1000 dPa·sec (1000 poise) is called the working temperature of the glass, and is the most suitable temperature for forming the glass. When manufacturing glass fibers, if the glass working temperature is 1100° C. or higher, variations in glass fiber diameter can be reduced. If the working temperature is 1300° C. or lower, the fuel cost for melting glass can be reduced, the glass manufacturing equipment will be less susceptible to corrosion due to heat, and the life of the equipment will be extended. The lower limit of the working temperature may be 1100°C or higher, 1120°C or higher, 1140°C or higher, 1150°C or higher, 1160°C or higher, 1170°C or higher, 1180°C or higher, or even 1200°C or higher. The upper limit of the working temperature may be 1300°C or less, 1280°C or less, 1270°C or less, 1260°C or less, or even 1250°C or less.
　作業温度から失透温度を差し引いた温度差ΔＴが大きいほど、ガラス成形時に失透が生じ難く、均質なガラスを高い歩留りで製造できる。したがって、ガラス組成ＡのΔＴは０℃以上でありうるし、１０℃以上、２０℃以上、３０℃以上、４０℃以上、さらには５０℃以上でありうる。一方、ΔＴが２００℃以下であれば、ガラス組成の調整が容易になる。ガラス組成ＡのΔＴは２００℃以下でありうるし、１８０℃以下、さらには１６０℃以下でありうる。 The larger the temperature difference ΔT obtained by subtracting the devitrification temperature from the working temperature, the less devitrification occurs during glass molding, and it is possible to produce homogeneous glass at a high yield. Therefore, ΔT of glass composition A may be 0°C or higher, 10°C or higher, 20°C or higher, 30°C or higher, 40°C or higher, or even 50°C or higher. On the other hand, if ΔT is 200° C. or less, the glass composition can be easily adjusted. ΔT of glass composition A may be 200°C or less, 180°C or less, or even 160°C or less.
　（ヤング率）
　ガラス繊維は、該ガラス繊維を形成するガラス組成物のヤング率が高いほど弾力性が良く、ガラス繊維により構成された断熱材や吸音材用の機械特性が向上する。ここで、ヤング率（ＧＰａ）は、通常の超音波法により、ガラス中を伝播する弾性波の縦波速度と横波速度とを測定し、別にアルキメデス法により測定したガラスの密度とから求めることができる。このヤング率の下限は７７ＧＰａ以上でありうるし、７８ＧＰａ以上、７９ＧＰａ以上、さらには８０ＧＰａ以上でありうる。ヤング率の上限は好ましくは１００ＧＰａ以下でありうるし、９９ＧＰａ以下、９８ＧＰａ以下、９７ＧＰａ以下、９６ＧＰａ以下、さらには９５ＧＰａ以下でありうる。 (Young's modulus)
The higher the Young's modulus of the glass composition forming the glass fiber, the better the elasticity of the glass fiber, and the better the mechanical properties of a heat insulating material or a sound absorbing material made of the glass fiber. Here, the Young's modulus (GPa) can be determined by measuring the longitudinal wave velocity and shear wave velocity of elastic waves propagating in the glass using a normal ultrasonic method, and from the density of the glass separately measured using the Archimedes method. can. The lower limit of Young's modulus may be 77 GPa or more, 78 GPa or more, 79 GPa or more, or even 80 GPa or more. The upper limit of Young's modulus may preferably be 100 GPa or less, 99 GPa or less, 98 GPa or less, 97 GPa or less, 96 GPa or less, or even 95 GPa or less.
　（ガラス転移温度）
　ガラス組成物は、ガラス転移温度（ガラス転移点、Ｔｇ）が高いほど耐熱性が高く、高温加熱を伴う加工に対して変形し難くなる。ガラス転移温度が５６０℃以上であれば、火災などの際に、グラスウールの形状が変化するおそれが小さい。本実施形態で規定したガラス組成であれば、５６０℃以上のガラス転移温度を有するガラスを容易に得ることができる。ガラス組成物のガラス転移温度は、５６０℃以上であることが好ましく、５７０℃以上であることがより好ましく、５８０℃以上であることがさらに好ましい。ガラス転移温度は、６００℃以上、６２０℃以上、６５０℃以上、６８０℃以上、７００℃以上、７２０℃以上、場合によっては７４０℃以上であってもよい。ガラス転移温度の上限は、８００℃程度であることが好ましく、７８０℃以下であることがより好ましい。 (Glass-transition temperature)
The higher the glass transition temperature (Tg) of a glass composition, the higher its heat resistance, and the less likely it is to be deformed by processing that involves high-temperature heating. If the glass transition temperature is 560° C. or higher, there is little risk that the shape of the glass wool will change in the event of a fire or the like. With the glass composition defined in this embodiment, a glass having a glass transition temperature of 560° C. or higher can be easily obtained. The glass transition temperature of the glass composition is preferably 560°C or higher, more preferably 570°C or higher, and even more preferably 580°C or higher. The glass transition temperature may be 600°C or higher, 620°C or higher, 650°C or higher, 680°C or higher, 700°C or higher, 720°C or higher, and in some cases 740°C or higher. The upper limit of the glass transition temperature is preferably about 800°C, more preferably 780°C or less.
　（化学的耐久性）
　断熱材および／または吸音材用途における化学的耐久性の指標としては、耐酸性、耐水性が適切である。
　耐酸性の指標としては、後述する質量減少率ΔＷ1が採用され、このΔＷ1が小さいほど耐酸性が高いことを示す。また、耐水性の指標としては、後述する質量減少率ΔＷ2が採用され、このΔＷ2が小さいほど耐水性が高いことを示す。ガラス繊維を断熱材や吸音材等に用いる場合、ΔＷ1は５．０質量％以下であることが好ましい。したがって、ガラスのΔＷ1は、５．０質量％以下でありうるし、４．０質量％以下、３．０質量％以下、２．０質量％以下、１．５質量％以下、１．２質量％以下、１．０質量％以下、０．９質量％以下、０．８質量％以下、０．７質量％以下、０．６質量％以下、０．５質量％以下、０．４質量％以下、０．３質量％以下、０．２質量％以下でありうる。本実施形態により実現できるΔＷ1は、例えば、０．０１～５．０質量％である。 (chemical durability)
Acid resistance and water resistance are appropriate indicators of chemical durability in heat insulation and/or sound absorbing material applications.
As an index of acid resistance, the mass reduction rate ΔW 1 described later is employed, and the smaller this ΔW 1 is, the higher the acid resistance is. Further, as an index of water resistance, the mass reduction rate ΔW 2 described later is employed, and the smaller this ΔW 2 is, the higher the water resistance is. When glass fiber is used as a heat insulating material, a sound absorbing material, etc., ΔW 1 is preferably 5.0% by mass or less. Therefore, ΔW 1 of the glass can be 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.5% by mass or less, 1.2% by mass or less % or less, 1.0 mass% or less, 0.9 mass% or less, 0.8 mass% or less, 0.7 mass% or less, 0.6 mass% or less, 0.5 mass% or less, 0.4 mass% The content may be 0.3% by mass or less and 0.2% by mass or less. The ΔW 1 that can be achieved by this embodiment is, for example, 0.01 to 5.0% by mass.
　ガラス繊維を断熱材や吸音材等に用いる場合、ガラス繊維のΔＷ2は０．５０質量％未満であることが好ましい。本実施形態のガラス組成物のΔＷ2は、０．５０質量％未満でありうるし、０．４５質量％以下、０．４０質量％以下、０．３５質量％以下、０．３０質量％以下、０．２５質量％以下、０．２０質量％以下でありうる。本実施形態により実現できるΔＷ2は、例えば、０．０１質量％以上０．５０質量％未満である。 When glass fiber is used for a heat insulating material, a sound absorbing material, etc., it is preferable that ΔW 2 of the glass fiber is less than 0.50% by mass. ΔW 2 of the glass composition of the present embodiment may be less than 0.50 mass%, 0.45 mass% or less, 0.40 mass% or less, 0.35 mass% or less, 0.30 mass% or less, It may be 0.25% by mass or less, and 0.20% by mass or less. ΔW 2 that can be realized by this embodiment is, for example, 0.01% by mass or more and less than 0.50% by mass.
　＜ガラス繊維＞
　本実施形態のガラス繊維は、上述したガラス組成物により構成される。本実施形態のガラス繊維は、ガラス長繊維であってもガラス短繊維であってもよい。ガラス長繊維は、粘度を制御したガラス融液をノズルから流出させ、巻き取り機によって巻き取って製造される。この連続繊維は、使用時に適切な長さに切断される。ガラス短繊維は、高圧空気、遠心力等によってガラス融液を吹き飛ばしながら製造される。ガラス短繊維は、綿状の形態を有しているためにグラスウールと呼ばれることもある。 <Glass fiber>
The glass fiber of this embodiment is made of the glass composition described above. The glass fibers of this embodiment may be long glass fibers or short glass fibers. Long glass fibers are produced by flowing a viscosity-controlled glass melt through a nozzle and winding it up with a winder. This continuous fiber is cut to an appropriate length at the time of use. Short glass fibers are manufactured by blowing away glass melt using high-pressure air, centrifugal force, or the like. Short glass fibers are sometimes called glass wool because they have a cotton-like morphology.
　ガラス繊維の平均繊維径は、例えば０．１～５０μｍである。ガラス繊維の平均繊維径は、平均繊維径は０．１μｍ以上、０．２μｍ以上、０．３μｍ以上、０．４μｍ以上、さらには０．５μｍ以上であってもよく、５０μｍ以下、４０μｍ以下、３０μｍ以下、２５μｍ以下であってもよい。ガラス長繊維の場合、平均繊維径は１μｍ以上、２μｍ以上、３μｍ以上、４μｍ以上、さらには５μｍ以上であってもよい。ガラス短繊維の場合、平均繊維径は１０μｍ以下、５μｍ以下、４μｍ以下、３μｍ以下、２μｍ以下、さらには１μｍ以下であってもよい。 The average fiber diameter of the glass fibers is, for example, 0.1 to 50 μm. The average fiber diameter of the glass fibers may be 0.1 μm or more, 0.2 μm or more, 0.3 μm or more, 0.4 μm or more, and even 0.5 μm or more, 50 μm or less, 40 μm or less, It may be 30 μm or less, or 25 μm or less. In the case of long glass fibers, the average fiber diameter may be 1 μm or more, 2 μm or more, 3 μm or more, 4 μm or more, or even 5 μm or more. In the case of short glass fibers, the average fiber diameter may be 10 μm or less, 5 μm or less, 4 μm or less, 3 μm or less, 2 μm or less, or even 1 μm or less.
＜グラスウール＞
　本実施形態のグラスウールは、上述したガラス繊維を含んでいる。本実施形態のグラスウールは、例えば、内部に空隙を含む上述したガラス短繊維の集積体であり、塊状、平板状、曲板状、波板状、筒状など使用部位に応じた各種形状を有しうる。本実施形態のグラスウールは、高い化学的耐久性を有しうる。このため、本実施形態のグラスウールは、雨水などの水が侵入しうる部位、化学工場などにおいて酸性度の高い環境下にある部位などにおいても、断熱材および／または吸音材としての特性を長期間安定して維持できる。 <Glass wool>
The glass wool of this embodiment contains the above-mentioned glass fibers. The glass wool of this embodiment is, for example, an aggregate of the above-mentioned short glass fibers containing voids inside, and has various shapes depending on the area of use, such as a lump, a flat plate, a curved plate, a corrugated plate, and a cylindrical shape. I can do it. The glass wool of this embodiment can have high chemical durability. Therefore, the glass wool of this embodiment maintains its properties as a heat insulating material and/or sound absorbing material for a long period of time, even in areas where water such as rainwater can enter, areas in highly acidic environments such as chemical factories, etc. Can be maintained stably.
　以下、実施例および比較例を挙げて本発明の実施形態をさらに具体的に説明する。
　（実施例および比較例）
　表１～７に示した組成となるように、珪砂等の通常のガラス原料を調合し、実施例および比較例毎にガラス原料のバッチを作製した。電気炉を用いて、各バッチを１５００～１６００℃まで加熱して溶融させ、組成が均一になるまで約４時間そのまま維持した。その後、溶融したガラス（ガラス溶融物）の一部を鉄板上に流し出し、電気炉中で室温まで徐冷し、バルクとしてのガラス組成物（板状物、ガラス試料）を得た。 Hereinafter, embodiments of the present invention will be described in more detail with reference to Examples and Comparative Examples.
(Example and comparative example)
Ordinary glass raw materials such as silica sand were prepared to have the compositions shown in Tables 1 to 7, and batches of glass raw materials were prepared for each example and comparative example. Using an electric furnace, each batch was heated to 1500-1600° C. to melt it and maintained there for about 4 hours until the composition became uniform. Thereafter, a part of the molten glass (glass melt) was poured out onto an iron plate and slowly cooled to room temperature in an electric furnace to obtain a bulk glass composition (plate-like material, glass sample).
　特性の評価法を以下に説明する。
　（ガラス転移温度）
　得られたガラス組成物について、市販の膨張計〔（株）リガク、熱機械分析装置、ＴＭＡ８５１０〕を用いて熱膨張係数を測定し、熱膨張曲線からガラス転移温度を求めた。 The method for evaluating the characteristics will be explained below.
(Glass-transition temperature)
The thermal expansion coefficient of the obtained glass composition was measured using a commercially available dilatometer (Rigaku Co., Ltd., Thermomechanical Analyzer, TMA8510), and the glass transition temperature was determined from the thermal expansion curve.
　（作業温度）
　得られたガラス組成物について、通常の白金球引き上げ法により粘度と温度との関係を調べ、その結果から作業温度を求めた。ここで、白金球引き上げ法とは、溶融ガラス中に白金球を浸し、その白金球を等速運動で引き上げる際の負荷荷重（抵抗）と、白金球に働く重力および浮力などとの関係を、微小の粒子が流体中を沈降する際の粘度と落下速度との関係を示したストークス（Ｓｔｏｋｅｓ）の法則にあてはめることにより、粘度を測定する方法である。 (Working temperature)
Regarding the obtained glass composition, the relationship between viscosity and temperature was investigated by the usual platinum ball pulling method, and the working temperature was determined from the results. Here, the platinum ball pulling method refers to the relationship between the load (resistance) applied when a platinum ball is immersed in molten glass and pulled up with uniform motion, and the gravity and buoyancy force acting on the platinum ball. This is a method of measuring viscosity by applying Stokes' law, which describes the relationship between viscosity and falling speed when minute particles settle in a fluid.
　（失透温度）
　粒子径１．０～２．８ｍｍの大きさに粉砕したガラス組成物を白金ボートに入れ、温度勾配（８００～１４００℃）を設けた電気炉中で２時間保持し、結晶の出現した位置に対応する電気炉の最高温度から失透温度を求めた。ガラスが白濁して結晶が観察できない場合は、白濁の出現した位置に対応する電気炉の最高温度を失透温度とした。ここで、粒子径は、ふるい分け法により測定された値である。なお、電気炉内の場所に応じて異なる温度（電気炉内の温度分布）は、予め測定されており、電気炉内の所定の場所に置かれたガラス組成物は、予め測定された、当該所定の場所の温度で加熱される。温度差ΔＴは、作業温度から失透温度を差し引いた温度差である。 (devitrification temperature)
A glass composition pulverized to a particle size of 1.0 to 2.8 mm was placed in a platinum boat, held in an electric furnace with a temperature gradient (800 to 1400°C) for 2 hours, and placed at the position where crystals appeared. The devitrification temperature was determined from the maximum temperature of the corresponding electric furnace. When the glass became cloudy and crystals could not be observed, the maximum temperature of the electric furnace corresponding to the position where the cloudiness appeared was taken as the devitrification temperature. Here, the particle size is a value measured by a sieving method. Note that the temperature (temperature distribution in the electric furnace) that varies depending on the location in the electric furnace is measured in advance, and the glass composition placed at a predetermined location in the electric furnace is Heated at a given location temperature. The temperature difference ΔT is the temperature difference obtained by subtracting the devitrification temperature from the working temperature.
　（ヤング率）
　ヤング率Ｅは、通常の超音波法により、ガラス中を伝播する弾性波の縦波速度ｖlと横波速度ｖtを測定し、別にアルキメデス法により測定したガラスの密度ρから、Ｅ＝３ρ・ｖt 2・（ｖl 2－４／３・ｖt 2）／（ｖl 2－ｖt 2)の式により求めた。 (Young's modulus)
The Young's modulus E is determined by measuring the longitudinal wave velocity v l and shear wave velocity v t of elastic waves propagating in the glass using a normal ultrasonic method, and from the density ρ of the glass separately measured using the Archimedes method, E=3ρ・It was determined by the formula: v t 2 ·(v l 2 -4/3·v t 2 )/(v l 2 -v t 2 ).
　（引張弾性率）
　得られたガラス組成物（バルク）を用いてガラス単繊維（フィラメント）を作製した。すなわち、ガラス組成物（バルク）を電気炉で再溶融した後、冷却しながらペレットに成形した。このペレットを用いて、直径が１５μｍであるガラス単繊維を作製した。得られたガラス繊維について、引張弾性率を日本産業規格（ＪＩＳ）の「炭素繊維－単繊維の引張特性の試験方法　Ｒ７６０６：２０００」に準拠した方法により測定した。 (Tensile modulus)
Glass single fibers (filaments) were produced using the obtained glass composition (bulk). That is, the glass composition (bulk) was remelted in an electric furnace and then molded into pellets while being cooled. Using this pellet, a single glass fiber having a diameter of 15 μm was produced. The tensile modulus of the obtained glass fiber was measured in accordance with the Japanese Industrial Standards (JIS) "Testing method for tensile properties of carbon fibers - monofilament R7606:2000".
　（化学的耐久性）
　得られたガラス組成物（バルク）を用いてガラス単繊維（フィラメント）を作製した。すなわち、ガラス組成物（バルク）を電気炉で再溶融した後、冷却しながらペレットに成形した。このペレットを用いて、直径が１５μｍであるガラス単繊維を作製した。
・耐酸性
　直径１５μｍのガラス単繊維を長さ２０ｍｍに切断し、ガラスの比重と同じグラム数量り取り、このガラス繊維を８０℃、１０質量％の硫酸水溶液１００ｍＬに２４時間浸漬した場合の質量減少率を求め、この質量減少率をΔＷ1とした。
・耐水性
　直径１５μｍのガラス単繊維を長さ２０ｍｍに切断し、ガラスの比重と同じグラム数量り取り、このガラス繊維を８０℃、蒸留水１００ｍＬに２４時間浸漬した場合の質量減少率を求め、この質量減少率をΔＷ2とした。
　なお、上記質量減少率は、浸漬前の質量をＷａ、浸漬後の質量をＷｂとして、以下の式に基づいて算出した。
　質量減少率（％）＝｛（Ｗａ－Ｗｂ）／Ｗａ｝×１００ (chemical durability)
Glass single fibers (filaments) were produced using the obtained glass composition (bulk). That is, the glass composition (bulk) was remelted in an electric furnace and then molded into pellets while being cooled. Using this pellet, a single glass fiber having a diameter of 15 μm was produced.
- Acid resistance: Cut a single glass fiber with a diameter of 15 μm into a length of 20 mm, weigh out the same number of grams as the specific gravity of the glass, and immerse this glass fiber in 100 mL of a 10 mass % sulfuric acid aqueous solution at 80°C for 24 hours. Loss in mass The mass reduction rate was determined as ΔW 1 .
・Water resistance Cut a single glass fiber with a diameter of 15 μm to a length of 20 mm, weigh out the same number of grams as the specific gravity of the glass, and calculate the mass reduction rate when this glass fiber is immersed in 100 mL of distilled water at 80 ° C. for 24 hours. This mass reduction rate was defined as ΔW 2 .
The mass reduction rate was calculated based on the following formula, where Wa is the mass before immersion and Wb is the mass after immersion.
Mass reduction rate (%) = {(Wa-Wb)/Wa}×100
　これらの測定結果を表１～７に示した。なお、表中のガラス組成は、すべて質量％で表示した値である。 The results of these measurements are shown in Tables 1 to 7. In addition, all the glass compositions in the table are values expressed in mass %.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000007
Figure JPOXMLDOC01-appb-T000007
　実施例１～７５からは、ヤング率７７～９３ＧＰａ、引張弾性率６９～８８ＧＰａ、ガラス転移温度５６２～７８２℃、作業温度１２０８～１２９７℃、温度差ΔＴ（作業温度－失透温度）２～２７１℃、ΔＷ1０．１６～２．６１質量％、ΔＷ2０．１４～０．４８質量％の結果が得られた。 Examples 1 to 75 have a Young's modulus of 77 to 93 GPa, a tensile modulus of elasticity of 69 to 88 GPa, a glass transition temperature of 562 to 782°C, a working temperature of 1208 to 1297°C, and a temperature difference ΔT (working temperature - devitrification temperature) of 2 to 271. ℃, ΔW 1 0.16 to 2.61% by mass, and ΔW 2 0.14 to 0.48% by mass.
　比較例１のガラス組成物は、板ガラス組成を有し、５５３℃と相対的に低いガラス転移温度と、０．５０質量％と相対的に大きいΔＷ2とを有していた。比較例２のガラス組成物はＣガラス組成を有する。Ｃガラスは５４９℃と相対的に低いガラス転移温度を有する。Ｃガラスは、Ｂ2Ｏ3の含有率が高く、製造設備への影響も懸念される。
  The glass composition of Comparative Example 1 had a plate glass composition, a relatively low glass transition temperature of 553° C., and a relatively large ΔW 2 of 0.50% by mass. The glass composition of Comparative Example 2 has a C glass composition. C glass has a relatively low glass transition temperature of 549°C. C glass has a high B 2 O 3 content, and there is concern that it may affect manufacturing equipment.

Claims (20)

  1. 　断熱材および／または吸音材用のガラス繊維であって、
    　質量％で表示して、
    　　５０≦ＳｉＯ2≦７５、
    　　　０≦Ｂ2Ｏ3≦４、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　　　５≦ＣａＯ≦３０、
    　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０、
    　の成分を含有するガラス組成物を含む、ガラス繊維。     Glass fiber for insulation and/or sound absorption,
    Displayed in mass%,
    50≦SiO 2 ≦75,
    0≦B 2 O 3 ≦4,
    5≦Al 2 O 3 ≦15,
    5≦CaO≦30,
    0≦( Li2O + Na2O + K2O )≦20,
    A glass fiber comprising a glass composition containing the following components.
  2. 　前記ガラス組成物が、質量％で表示して、０≦Ｔ－Ｆｅ2Ｏ3≦５、の成分を含有する、請求項１に記載のガラス繊維。
    　ただし、Ｔ－Ｆｅ2Ｏ3は、Ｆｅ2Ｏ3に換算した全酸化鉄である。     The glass fiber according to claim 1, wherein the glass composition contains a component of 0≦T-Fe 2 O 3 ≦5 expressed in mass %.
    However, T-Fe 2 O 3 is total iron oxide converted to Fe 2 O 3 .
  3. 　前記ガラス組成物が、質量％で表示して、
    　　５０≦ＳｉＯ2≦６７、
    　　　０≦Ｂ2Ｏ3＜２、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
    　　　１≦ＭｇＯ≦１０、
    　　１０≦ＣａＯ≦３０、
    　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦１２、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有する、請求項２に記載のガラス繊維。     The glass composition is expressed in mass %,
    50≦SiO 2 ≦67,
    0≦B 2 O 3 <2,
    5≦Al 2 O 3 ≦15,
    45≦(SiO 2 -Al 2 O 3 )≦57,
    1≦MgO≦10,
    10≦CaO≦30,
    0≦( Li2O + Na2O + K2O )≦12,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 2, containing the following components.
  4. 　前記ガラス組成物が、質量％で表示して、
    　　５０≦ＳｉＯ2≦６７、
    　　　０≦Ｂ2Ｏ3＜２、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
    　　　１≦ＭｇＯ≦１０、
    　　１５≦ＣａＯ≦３０、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有し、アルカリ金属酸化物を実質的に含有しない、請求項３に記載のガラス繊維。     The glass composition is expressed in mass %,
    50≦SiO 2 ≦67,
    0≦B 2 O 3 <2,
    5≦Al 2 O 3 ≦15,
    45≦(SiO 2 -Al 2 O 3 )≦57,
    1≦MgO≦10,
    15≦CaO≦30,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 3, which contains the following components and is substantially free of alkali metal oxides.
  5. 　前記ガラス組成物が、質量％で表示して、
    　　５７≦ＳｉＯ2≦６７、
    　　　０≦Ｂ2Ｏ3＜２、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
    　　　１≦ＭｇＯ≦１０、
    　　１５≦ＣａＯ≦３０、
    　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有する、請求項３に記載のガラス繊維。     The glass composition is expressed in mass %,
    57≦SiO 2 ≦67,
    0≦B 2 O 3 <2,
    5≦Al 2 O 3 ≦15,
    45≦(SiO 2 -Al 2 O 3 )≦57,
    1≦MgO≦10,
    15≦CaO≦30,
    0≦( Li2O + Na2O + K2O )≦4,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 3, which contains the following components.
  6. 　前記ガラス組成物が、質量％で表示して、
    　　５０≦ＳｉＯ2≦６７、
    　　　０≦Ｂ2Ｏ3＜２、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
    　　　１≦ＭｇＯ≦１０、
    　　１０≦ＣａＯ≦３０、
    　　　１≦ＳｒＯ≦１５、
    　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有する、請求項３に記載のガラス繊維。     The glass composition is expressed in mass %,
    50≦SiO 2 ≦67,
    0≦B 2 O 3 <2,
    5≦Al 2 O 3 ≦15,
    45≦(SiO 2 -Al 2 O 3 )≦57,
    1≦MgO≦10,
    10≦CaO≦30,
    1≦SrO≦15,
    0≦( Li2O + Na2O + K2O )≦4,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 3, which contains the following components.
  7. 　前記ガラス組成物が、質量％で表示して、
    　　６５＜ＳｉＯ2≦７５、
    　　　０≦Ｂ2Ｏ3＜２、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　５０＜（ＳｉＯ2－Ａｌ2Ｏ3）≦６０、
    　　　１≦ＭｇＯ≦１０、
    　　１０≦ＣａＯ≦２５、
    　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有する、請求項２に記載のガラス繊維。     The glass composition is expressed in mass %,
    65< SiO2 ≦75,
    0≦B 2 O 3 <2,
    5≦Al 2 O 3 ≦15,
    50<(SiO 2 -Al 2 O 3 )≦60,
    1≦MgO≦10,
    10≦CaO≦25,
    0≦( Li2O + Na2O + K2O )≦4,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 2, containing the following components.
  8. 　前記ガラス組成物が、質量％で表示して、
    　　６０≦ＳｉＯ2≦７５、
    　　　０≦Ｂ2Ｏ3≦４、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　４７≦（ＳｉＯ2－Ａｌ2Ｏ3）≦６０、
    　　　１≦ＭｇＯ≦１０、
    　　１０≦ＣａＯ≦２５、
    　　　４＜（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）＜９、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有する、請求項２に記載のガラス繊維。     The glass composition is expressed in mass %,
    60≦SiO 2 ≦75,
    0≦B 2 O 3 ≦4,
    5≦Al 2 O 3 ≦15,
    47≦(SiO 2 -Al 2 O 3 )≦60,
    1≦MgO≦10,
    10≦CaO≦25,
    4<( Li2O + Na2O + K2O )<9,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 2, containing the following components.
  9. 　前記ガラス組成物が、質量％で表示して、
    　　６０≦ＳｉＯ2≦７５、
    　　　０≦Ｂ2Ｏ3≦４、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　４７≦（ＳｉＯ2－Ａｌ2Ｏ3）≦６０、
    　　　５≦ＣａＯ≦２０、
    　　　６≦Ｎａ2Ｏ≦２０、
    　　　９≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有する、請求項２に記載のガラス繊維。     The glass composition is expressed in mass %,
    60≦SiO 2 ≦75,
    0≦B 2 O 3 ≦4,
    5≦Al 2 O 3 ≦15,
    47≦(SiO 2 -Al 2 O 3 )≦60,
    5≦CaO≦20,
    6≦Na 2 O≦20,
    9≦( Li2O + Na2O + K2O )≦20,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 2, containing the following components.
  10. 　断熱材および／または吸音材用のガラス繊維であって、
    　質量％で表示して、
    　　５０≦ＳｉＯ2≦７５、
    　　　０≦Ｂ2Ｏ3≦４、
    　０．１≦（ＭｇＯ＋ＣａＯ）≦２０、
    　　　９≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦２０、
    　　　５≦ＺｒＯ2≦２０、
    　の成分を含有するガラス組成物を含む、ガラス繊維。     Glass fiber for insulation and/or sound absorption,
    Displayed in mass%,
    50≦SiO 2 ≦75,
    0≦B 2 O 3 ≦4,
    0.1≦(MgO+CaO)≦20,
    9≦( Li2O + Na2O + K2O )≦20,
    5≦ZrO 2 ≦20,
    A glass fiber comprising a glass composition containing the following components.
  11. 　前記ガラス組成物が、Ｂ2Ｏ3を実質的に含有しない、請求項１～１０のいずれか１項に記載のガラス繊維。 Glass fiber according to any one of claims 1 to 10, wherein the glass composition is substantially free of B 2 O 3 .
  12. 　前記ガラス組成物が、質量％で表示して、
    　　５５≦ＳｉＯ2≦６７、
    　０．１≦Ｂ2Ｏ3＜２、
    　　　５≦Ａｌ2Ｏ3≦１５、
    　４５≦（ＳｉＯ2－Ａｌ2Ｏ3）≦５７、
    　　　１≦ＭｇＯ≦１０、
    　　１５≦ＣａＯ≦３０、
    　　　０≦（Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ）≦４、
    　　　０≦Ｔ－Ｆｅ2Ｏ3≦５、
    　の成分を含有する、請求項３に記載のガラス繊維。     The glass composition is expressed in mass %,
    55≦SiO 2 ≦67,
    0.1≦B 2 O 3 <2,
    5≦Al 2 O 3 ≦15,
    45≦(SiO 2 -Al 2 O 3 )≦57,
    1≦MgO≦10,
    15≦CaO≦30,
    0≦( Li2O + Na2O + K2O )≦4,
    0≦T-Fe 2 O 3 ≦5,
    The glass fiber according to claim 3, which contains the following components.
  13. 　前記ガラス組成物の粘度が１０００ｄＰａ・ｓｅｃであるときの温度を作業温度としたとき、前記作業温度が１３００℃以下である、請求項１～１２のいずれか１項に記載のガラス繊維。 The glass fiber according to any one of claims 1 to 12, wherein the working temperature is 1300°C or less when the working temperature is the temperature when the viscosity of the glass composition is 1000 dPa·sec.
  14. 　前記ガラス組成物の粘度が１０００ｄＰａ・ｓｅｃであるときの温度を作業温度としたとき、前記作業温度から失透温度を差し引いた温度差ΔＴが０℃以上である、請求項１～１３のいずれか１項に記載のガラス繊維。 Any one of claims 1 to 13, wherein the temperature difference ΔT obtained by subtracting the devitrification temperature from the working temperature is 0° C. or more, when the working temperature is the temperature when the viscosity of the glass composition is 1000 dPa sec. Glass fiber according to item 1.
  15. 　前記ガラス組成物のΔＷ1が０．０１～１．５質量％である、請求項１～１４のいずれか１項に記載のガラス繊維。
    　ここで、前記ΔＷ1は、質量を前記ガラス組成物の比重と同じ値のグラム数とした、前記ガラス組成物により構成された直径１５μｍ、長さ２０ｍｍのガラス単繊維群を、８０℃、１０質量％の硫酸水溶液１００ｍＬに２４時間浸漬したときの質量減少率である。     The glass fiber according to any one of claims 1 to 14, wherein the glass composition has a ΔW 1 of 0.01 to 1.5% by mass.
    Here, ΔW 1 is a group of single glass fibers with a diameter of 15 μm and a length of 20 mm made of the glass composition, whose mass is in grams having the same value as the specific gravity of the glass composition, at 80° C. This is the mass reduction rate when immersed in 100 mL of a sulfuric acid aqueous solution of % by mass for 24 hours.
  16. 　前記ガラス組成物のΔＷ2が０．０１～０．５質量％である、請求項１～１５のいずれか１項に記載のガラス繊維。
    　ここで、前記ΔＷ2は、質量を前記ガラス組成物の比重と同じ値のグラム数とした、前記ガラス組成物により構成された直径１５μｍ、長さ２０ｍｍのガラス単繊維群を、８０℃の蒸留水１００ｍＬに２４時間浸漬したときの質量減少率である。     The glass fiber according to any one of claims 1 to 15, wherein the glass composition has a ΔW 2 of 0.01 to 0.5% by mass.
    Here, the above ΔW 2 is obtained by distilling a group of glass single fibers with a diameter of 15 μm and a length of 20 mm made of the glass composition at 80°C, with the mass in grams having the same value as the specific gravity of the glass composition. This is the mass reduction rate when immersed in 100 mL of water for 24 hours.
  17. 　前記ガラス組成物のガラス転移温度が５６０～８００℃である、請求項１～１６のいずれか１項に記載のガラス繊維。 The glass fiber according to any one of claims 1 to 16, wherein the glass composition has a glass transition temperature of 560 to 800°C.
  18. 　前記ガラス組成物のヤング率が７７～１００ＧＰａである、請求項１～１７のいずれか１項に記載のガラス繊維。 The glass fiber according to any one of claims 1 to 17, wherein the glass composition has a Young's modulus of 77 to 100 GPa.
  19. 　前記ガラス組成物により構成された直径が１５μｍであるガラス単繊維を、日本産業規格（ＪＩＳ）の「炭素繊維－単繊維の引張特性の試験方法　Ｒ７６０６：２０００」に準拠した方法により測定したときの引張弾性率が６９～８８ＧＰａである、請求項１～１８のいずれか１項に記載のガラス繊維。 When a glass single fiber with a diameter of 15 μm made of the above glass composition was measured by a method compliant with the Japanese Industrial Standards (JIS) "Test method for tensile properties of carbon fiber-single fiber R7606:2000". Glass fiber according to any one of claims 1 to 18, having a tensile modulus of 69 to 88 GPa.
  20. 　請求項１～１９のいずれか１項に記載のガラス繊維を含む、断熱材および／または吸音材であるグラスウール。
          Glass wool that is a heat insulating material and/or a sound absorbing material, comprising the glass fiber according to any one of claims 1 to 19.
PCT/JP2023/013383 2022-03-30 2023-03-30 Glass fibers WO2023190982A1 (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55113646A (en) * 1978-12-08 1980-09-02 Saint Gobain Fiberizing glass
JPS55140735A (en) * 1979-03-15 1980-11-04 Pilkington Brothers Ltd Alkali resistant glass fiber
JP2003500330A (en) * 1999-05-28 2003-01-07 ピーピージー インダストリーズ オハイオ， インコーポレイテッド Glass fiber composition
JP2007529401A (en) * 2004-03-17 2007-10-25 サン−ゴバン ベトロテックス フランス ソシエテ アノニム Glass strands that can reinforce organic and / or inorganic materials
JP2010507557A (en) * 2006-10-25 2010-03-11 サン ゴバン ヴェトロテックス フランス ソシエテ アノニム Glass composition resistant to chemical media for the production of glass reinforced yarns
JP2010513207A (en) * 2006-12-22 2010-04-30 サンーゴバン テクニカル ファブリックス ヨーロッパ Glass yarn that can reinforce organic and / or inorganic materials
US20100184345A1 (en) * 2007-05-23 2010-07-22 Saint-Gobain Technical Fabrics Europe Glass yarns suitable for reinforcing organic and/or inorganic materials
US20130217822A1 (en) * 2005-11-04 2013-08-22 Douglas A. Hofmann Composition for high performance glass, high performance glass fibers and articles therefrom
EP2676939A1 (en) * 2011-02-14 2013-12-25 Chongqing Polycomp International Corporation Glass fibre composition free of boron and fluorine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55113646A (en) * 1978-12-08 1980-09-02 Saint Gobain Fiberizing glass
JPS55140735A (en) * 1979-03-15 1980-11-04 Pilkington Brothers Ltd Alkali resistant glass fiber
JP2003500330A (en) * 1999-05-28 2003-01-07 ピーピージー インダストリーズ オハイオ， インコーポレイテッド Glass fiber composition
JP2007529401A (en) * 2004-03-17 2007-10-25 サン−ゴバン ベトロテックス フランス ソシエテ アノニム Glass strands that can reinforce organic and / or inorganic materials
US20130217822A1 (en) * 2005-11-04 2013-08-22 Douglas A. Hofmann Composition for high performance glass, high performance glass fibers and articles therefrom
JP2010507557A (en) * 2006-10-25 2010-03-11 サン ゴバン ヴェトロテックス フランス ソシエテ アノニム Glass composition resistant to chemical media for the production of glass reinforced yarns
JP2010513207A (en) * 2006-12-22 2010-04-30 サンーゴバン テクニカル ファブリックス ヨーロッパ Glass yarn that can reinforce organic and / or inorganic materials
US20100184345A1 (en) * 2007-05-23 2010-07-22 Saint-Gobain Technical Fabrics Europe Glass yarns suitable for reinforcing organic and/or inorganic materials
EP2676939A1 (en) * 2011-02-14 2013-12-25 Chongqing Polycomp International Corporation Glass fibre composition free of boron and fluorine

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