JP3703514B2 - Neutral gray glass composition - Google Patents

Neutral gray glass composition Download PDF

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Publication number
JP3703514B2
JP3703514B2 JP31014494A JP31014494A JP3703514B2 JP 3703514 B2 JP3703514 B2 JP 3703514B2 JP 31014494 A JP31014494 A JP 31014494A JP 31014494 A JP31014494 A JP 31014494A JP 3703514 B2 JP3703514 B2 JP 3703514B2
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Prior art keywords
glass
less
transmittance
neutral gray
glass composition
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JPH08165136A (en
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國雄 中口
義一 年清
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Nippon Sheet Glass Co Ltd
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Nippon Sheet Glass Co Ltd
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    • 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
    • C03C4/00—Compositions for glass with special properties
    • C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
    • C03C4/082—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths for infrared absorbing glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
    • 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
    • C03C4/00—Compositions for glass with special properties
    • C03C4/02—Compositions for glass with special properties for coloured glass
    • 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
    • C03C4/00—Compositions for glass with special properties
    • C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
    • C03C4/085—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths for ultraviolet absorbing glass

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

Description

【０００１】
【産業上の利用分野】
本発明は、中性灰色ガラス組成物に関する。更に詳しくは、紫外線、赤外線の吸収能に優れた中性灰色ガラス組成物に関する。
【０００２】
【従来の技術】
近時、冷房負荷の軽減による省エネルギーの要請、室内内装材の太陽紫外線による劣化防止の要請等から、紫外線及び赤外線の吸収能の優れた着色ガラスが提案されてきた。その中で、従来用いられてきた中性灰色ガラスには次のようなものがある。
【０００３】
特公昭５２−４９０１０号に開示された中性灰色ガラスは、ソーダ・石灰・シリカガラス中に重量％で０．１〜０．５％のＦｅ2Ｏ3（全鉄）、０．００３〜０．０２％のＣｏＯ、０〜０．００２％のＮｉＯ、０．０００５〜０．００１％のＳｅからなる着色剤を含有している。この中性灰色ガラスの光学特性は、厚さ５ｍｍのガラスで可視光線透過率が５７〜６３％、太陽輻射熱透過率が５７〜６３％、主波長が５８０ｍμ以下、色純度が１．５％以下である。
【０００４】
特開平２−６４０３８号に開示された、黒ずんだ薄い灰色でニッケルを含まないガラス組成物は、ソーダ・石灰・シリカガラス中に重量％で０．５５〜１．０％のＦｅ2Ｏ3（全鉄）、０．００３〜０．０２％のＳｅ、０．００５〜０．０２％のＣｏＯからなる着色剤を含有している。このガラス組成物は、厚さ５．５６ｍｍのガラスで２０％以下の光透過率を有する。
【０００５】
特開平３−１５３５４３号に開示された中性灰色低透過性ガラス組成物は、ソーダ・石灰・シリカガラス中に重量％で０．４〜０．７％のＦｅ2Ｏ3（全鉄）、０．０８〜０．１５％のＦｅＯ、０．００３〜０．００８％のＳｅ、０．００３〜０．０２５％のＣｏＯ、０．０２２〜０．０５０％のＣｒ2Ｏ3からなる着色剤を含有している。このガラス組成物は、厚さ５．５６ｍｍのガラスで２０％未満の光透過率を有する。
【０００６】
特開平４−２７５９４３号に開示された暗灰色赤外線吸収ガラス組成物は、ソーダ・石灰・シリカガラス中に重量％で１．００〜１．７％のＦｅ2Ｏ3（全鉄）、少なくとも０．２７％のＦｅＯ、０．００２〜０．００５％のＳｅ、０．０１〜０．０２％のＣｏＯからなる着色剤を含有した、くすんだ灰色ガラス組成物である。このガラス組成物は、厚さ３．９ｍｍのガラスで３２％以下の光透過率及び１５％未満の全太陽赤外線透過率を有する。
【０００７】
特開平５−５８６７０号に開示されている車両用ガラスは、ソーダ・石灰・シリカガラス中に重量％で０．２〜０．６％のＦｅ2Ｏ3（全鉄）、０．１〜１％のＣｅＯ2 （全酸化セリウム）、 ０〜１％のＴｉＯ2、０〜０．００５％のＣｏＯ、０〜０．０１％のＮｉＯ、０．０００５〜０．００５％のＳｅからなる着色剤と紫外線吸収剤を含有している。このガラスの光学特性は、厚さ４ｍｍでＡ光源による可視光線透過率が７０％以上、Ｃ光源による主波長が５７０ｎｍ以上、太陽放射透過率が６０％以下、３５０ｎｍにおける透過率が１０％以下である。
【０００８】
特開平６−２４７７４０号に開示された中性灰色系色調ガラスは、ソーダ・石灰・シリカガラス中に重量％で０．４５〜０．７５％のＦｅ2Ｏ3（全鉄）、０〜０．７０％のＴｉＯ2、 ０．０１４０〜０．０２５０％のＣｏＯ、０〜０．０３５０％のＮｉＯ、０〜０．０３５０％のＣｒ2Ｏ3、０．００１０〜０．００６０％のＳｅからなる着色剤を含有している。このガラスの光学特性は、厚さ３ｍｍでＤ65光源による主波長が４９５〜５７３ｎｍ、可視光線透過率が５０％以下、日射透過率が５５％以下、紫外線透過率が２５％以下である。
【０００９】
【発明が解決しようとする課題】
前記特公昭５２−４９０１０号に開示された中性灰色ガラスは、着色剤の酸化鉄分が少なく、鉄分以外に紫外線吸収剤を含有しないので、太陽放射透過率及び紫外線透過率が高いという不都合があった。
【００１０】
前記特開平２−６４０３８号に開示されたガラス組成物は、着色剤のＣｏＯとＳｅの量が多いので可視光線透過率が小さく、ガラスの内側から外の景色を見にくいという不具合があった。
【００１１】
また、前記特開平３−１５３５４３号に開示されたガラス組成物も、前記特開平２−６４０３８号と同じ理由から、可視光線透過率が低すぎるという不具合があった。
【００１２】
前記特開平４−２７５９４３号に開示された暗灰色赤外線吸収ガラス組成物は、Ｆｅ2Ｏ3（全鉄）とＣｏＯの量が多いので可視光線透過率が低く、ガラスの内側から外の景色を見にくいという不具合があった。
【００１３】
前記特開平５−５８６７０号に開示された車両用ガラスは、可視光線透過率を７０％以上と高くしていることから、着色剤のＦｅ2Ｏ3（全鉄）の量が少なく、太陽放射透過率が高いという不具合があった。
【００１４】
前記特開平６−２４７７４０号に開示された中性灰色系色調ガラスは、ＣｏＯの量が多く可視光線透過率が低くなり、プライバシー保護には適しているが、ガラスの内側から外の景色が見にくいという不具合があった。
【００１５】
【課題を解決するための手段】
本発明は質量％で表示して本質的に、６５〜８０％のＳｉＯ2、 ０〜５％のＡｌ2Ｏ3、０〜１０％のＭｇＯ、５〜１５％のＣａＯ、１０〜１８％のＮａ2Ｏ、０〜５％のＫ2Ｏ、 ５〜１５％のＭｇＯ＋ＣａＯ、１０〜２０％のＮａ2Ｏ＋Ｋ2Ｏ、０．８％以上０．９％未満のＦｅ2Ｏ3に換算した酸化鉄、０．２〜１．０％のＴｉＯ2、０．００３％以上０．０６０％未満のＣｏＯ、０．００１１〜０．００５％のＳｅからなり、板厚３．９ｍｍのガラスでの日射透過率が４０％以下で、且つ太陽紫外線透過率が３０％以下であることを特徴とする中性灰色ガラス組成物である。
【００１６】
【作用】
ＳｉＯ2はガラスの骨格を形成する主成分である。ＳｉＯ2が６５％未満ではガラスの耐久性が低下し、８０％を越えるとガラスの溶融が困難になる。
【００１７】
Ａｌ2Ｏ3はガラスの耐久性を高めるが、５％を越えるとガラスの溶融が困難になる。
【００１８】
ＭｇＯはガラスの粘度を調整する成分であるが、１０％を越えるとガラスの液相温度が上昇し、成形が困難になる。
【００１９】
ＣａＯはガラスの耐久性を高め、粘度を調整する成分であるが、５％未満ではガラスの耐久性が低下し、１５％を越えるとガラスの液相温度が上昇する。
【００２０】
ＭｇＯとＣａＯとの合計が５％未満ではガラスの耐久性が低下し、１５％を越えるとガラスの液相温度が上昇する。
【００２１】
Ｎａ2Ｏ はガラスの溶融促進剤であるが、１０％未満ではガラスの溶融が困難であり、１８％を越えるとガラスの耐久性が低下する。
【００２２】
Ｋ2ＯはＮａ2Ｏと同じくガラスの溶融促進剤であるが、原料が高価であるため５％を越えるのは好ましくない。
【００２３】
Ｎａ2ＯとＫ2Ｏの合計が１０％未満ではガラスの溶融が困難になり、２０％を越えるとガラスの耐久性が低下する。
【００２４】
ガラス中の酸化鉄はＦｅ2Ｏ3とＦｅＯの状態で存在する。Ｆｅ2Ｏ3は紫外線を吸収し、ＦｅＯは赤外線を吸収する。Ｆｅ2Ｏ3に換算した酸化鉄が０．８％未満ではガラスの紫外線及び赤外線の吸収能が低くなり、０．９％以上になるとガラスの可視光線透過率が低くなり好ましくない。
【００２５】
ＴｉＯ2は紫外線を吸収する。ＴｉＯ2が０．２％未満では紫外線吸収の効果が小さく、ＴｉＯ2が１．０％を越えるとガラスの可視光線透過率が低下する。
【００２６】
ＣｏＯとＳｅはガラスを中性灰色に着色させる成分である。ＣｏＯが０．００３％未満ではガラスの刺激純度が高すぎて中性灰色にならず、０．００６％以上ではガラスが青色になる。
【００２７】
Ｓｅが０．００１１％未満ではガラスが中性灰色にならず、０．００５％を越えるとガラスの可視光線透過率が低下する。
【００２８】
本発明に係る中性灰色ガラス組成物は、以上の成分の他に本発明の趣旨を損なわない範囲で、Ｌｉ2Ｏ、Ｂ2Ｏ3、ＢａＯ、ＺｎＯ、ＺｒＯ2を合計で２質量％以下含有させることができる。また、ＳＯ3、Ｓｂ2Ｏ3、Ａｓ2Ｏ3、Ｃｌ等の清澄剤を合計で１質量％以下含有させることができる。
【００２９】
【実施例】
以下、本発明を表を参照しながら詳細に説明する。
【００３０】
（実施例）
表１は本発明の実施例である。表１において、Ｔ−Ｆｅ2Ｏ3はＦｅ2Ｏ3に換算した全酸化鉄を示す。また、ＹCは可視光線透過率（Ｃ光源による）を、ＴGは日射透過率を、ＴUVは太陽紫外線透過率を、λdは主波長（Ｃ光源による）を、Ｐeは刺激純度（Ｃ光源による）をそれぞれ示す。
【００３１】
【表１】

Figure 0003703514
【００３２】
ガラスの製造に当たっては、珪砂、長石、石灰石、苦灰石、ソーダ灰、芒硝、カーボン、弁柄、酸化チタン、酸化コバルト、セレンを目標組成に応じて調合、混合したバッチを、電気炉中で加熱、溶融した。ガラスを流しだし成形した後、室温まで徐冷した。徐冷したガラスを所定の寸法に切断、研磨して、厚さ３．９ｍｍの光学特性測定用のサンプルを作製し、標準の光源Ｃを用いて、２゜視野によって光学特性を測定した。太陽紫外線透過率は、エアーマスが２の時の太陽放射エネルギーの２９５〜４００ｎｍの分光透過率から求めた。
【００３３】
本発明の実施例のガラスは、表１から明らかなように日射透過率ＴGが４０％以下、太陽紫外線透過率ＴUVが３０％以下と低いにも係わらず、可視光線透過率ＹCは５０％以上あり、ガラスの内側から外を眺めるのに不具合がない。
【００３４】
（比較例）
表２は本発明に対する比較例を示す。比較例９はＣｏＯ及びＳｅが本発明の範囲を越えているので、可視光線透過率ＹCが低くなりすぎて好ましくない。比較例１０はＴ−Ｆｅ2Ｏ3（全鉄）が本発明の範囲未満であるので、日射透過率ＴG及び太陽紫外線透過率ＴUVが高くなりすぎて好ましくない。比較例１１はＴ−Ｆｅ2Ｏ3（全鉄）が本発明の範囲を越えているので、可視光線透過率ＹCが低くなりすぎて好ましくない。比較例１２はＴｉＯ2を含有していないので、太陽紫外線透過率ＴUVが高くなり好ましくない。
【００３５】
【表２】
Figure 0003703514
【００３６】
【効果】
以上詳述した通り、本発明による中性灰色ガラス組成物は、可視光線透過率が比較的高く、太陽紫外線透過率及び日射透過率が低く、更に刺激純度も小さいので、車両用及び建築用に好適である。[0001]
[Industrial application fields]
The present invention relates to a neutral gray glass composition. More specifically, the present invention relates to a neutral gray glass composition having an excellent ability to absorb ultraviolet rays and infrared rays.
[0002]
[Prior art]
Recently, colored glass having excellent absorption ability of ultraviolet rays and infrared rays has been proposed from the demand for energy saving by reducing the cooling load and the prevention of deterioration of indoor interior materials by solar ultraviolet rays. Among them, conventionally used neutral gray glass includes the following.
[0003]
The neutral gray glass disclosed in JP-B-52-49010 is 0.1 to 0.5% by weight of Fe 2 O 3 (total iron), 0.003 to 0 in soda / lime / silica glass. It contains a colorant consisting of 0.02% CoO, 0-0.002% NiO, 0.0005-0.001% Se. The optical properties of this neutral gray glass are 5 mm thick glass with a visible light transmittance of 57 to 63%, a solar radiation heat transmittance of 57 to 63%, a dominant wavelength of 580 mμ or less, and a color purity of 1.5% or less. It is.
[0004]
The glass composition disclosed in JP-A-2-64038, which is dark and light gray and does not contain nickel, contains 0.55 to 1.0% by weight of Fe 2 O 3 (% by weight) in soda / lime / silica glass. It contains a colorant consisting of all iron), 0.003-0.02% Se, 0.005-0.02% CoO. This glass composition is a glass having a thickness of 5.56 mm and has a light transmittance of 20% or less.
[0005]
The neutral gray low-permeability glass composition disclosed in JP-A-3-153543 is 0.4 to 0.7% by weight of Fe 2 O 3 (total iron) in soda / lime / silica glass, Colorant comprising 0.08-0.15% FeO, 0.003-0.008% Se, 0.003-0.025% CoO, 0.022-0.050% Cr 2 O 3 Contains. This glass composition is a glass having a thickness of 5.56 mm and has a light transmittance of less than 20%.
[0006]
The dark gray infrared ray absorbing glass composition disclosed in Japanese Patent Application Laid-Open No. 4-275743 is 1.00 to 1.7% by weight of Fe 2 O 3 (total iron), at least 0% in soda / lime / silica glass. A dull gray glass composition containing a colorant consisting of .27% FeO, 0.002 to 0.005% Se, 0.01 to 0.02% CoO. This glass composition is a glass having a thickness of 3.9 mm and has a light transmittance of 32% or less and a total solar infrared transmittance of less than 15%.
[0007]
The glass for vehicles disclosed in JP-A-5-58670 is 0.2 to 0.6% Fe 2 O 3 (total iron), 0.1 to 1% by weight in soda / lime / silica glass. % CeO 2 (total cerium oxide), 0 to 1% TiO 2 , 0 to 0.005% CoO, 0 to 0.01% NiO, 0.0005 to 0.005% Se And contains UV absorber. The optical properties of this glass are: thickness 4 mm, visible light transmittance by A light source is 70% or more, dominant wavelength by C light source is 570 nm or more, solar radiation transmittance is 60% or less, and transmittance at 350 nm is 10% or less. is there.
[0008]
The neutral gray-tone glass disclosed in JP-A-6-247740 is 0.45 to 0.75% by weight of Fe 2 O 3 (total iron), 0 to 0 in soda / lime / silica glass. .70% of TiO 2, from 0.0140 to .0250% of CoO, from 0 to .0350% of NiO, from 0 to .0350% of Cr 2 O 3, from 0.0010 to 0.0060 percent of Se Contains a coloring agent. The optical properties of this glass are 3 mm in thickness, a dominant wavelength of 495 to 573 nm by a D65 light source, a visible light transmittance of 50% or less, a solar radiation transmittance of 55% or less, and an ultraviolet transmittance of 25% or less.
[0009]
[Problems to be solved by the invention]
The neutral gray glass disclosed in Japanese Patent Publication No. 52-49010 has a disadvantage that the solar radiation transmittance and the ultraviolet transmittance are high because the coloring agent has a low iron oxide content and does not contain an ultraviolet absorber other than iron. It was.
[0010]
The glass composition disclosed in Japanese Patent Application Laid-Open No. 2-64038 has a problem in that the amount of CoO and Se as colorants is large, so that the visible light transmittance is small and it is difficult to see the outside scenery from the inside of the glass.
[0011]
Further, the glass composition disclosed in JP-A-3-153543 also has a problem that the visible light transmittance is too low for the same reason as in JP-A-2-64038.
[0012]
The dark gray infrared absorbing glass composition disclosed in JP-A-4-275743 has a low visible light transmittance due to a large amount of Fe 2 O 3 (total iron) and CoO, and provides a view from the inside of the glass to the outside. There was a problem that it was difficult to see.
[0013]
Since the vehicle glass disclosed in Japanese Patent Application Laid-Open No. 5-58670 has a visible light transmittance as high as 70% or more, the amount of the colorant Fe 2 O 3 (total iron) is small and solar radiation. There was a problem that the transmittance was high.
[0014]
The neutral gray-tone glass disclosed in JP-A-6-247740 has a large amount of CoO and low visible light transmittance, and is suitable for privacy protection, but it is difficult to see the scenery from the inside of the glass. There was a problem that.
[0015]
[Means for Solving the Problems]
The present invention is essentially to in wt%, 65% to 80% of SiO 2, 0 to 5% of Al 2 O 3, 0% of MgO, 5 to 15% of CaO, 10 to 18% Na 2 O, 0~5% of K 2 O, 5~15% of MgO + CaO, 10~20% of Na 2 O + K 2 O, oxidation in terms of Fe 2 O 3 less than 0.8% or more 0.9% iron, 0.2% to 1.0% of TiO 2, less than 0.003% or more 0.0 60% CoO, made 0.0 011 to 0.005% of Se, a glass having a thickness of 3.9mm The neutral gray glass composition has a solar transmittance of 40% or less and a solar ultraviolet transmittance of 30% or less .
[0016]
[Action]
SiO 2 is a main component that forms a glass skeleton. If the SiO 2 content is less than 65%, the durability of the glass decreases. If it exceeds 80%, it becomes difficult to melt the glass.
[0017]
Al 2 O 3 increases the durability of the glass, but if it exceeds 5%, it becomes difficult to melt the glass.
[0018]
MgO is a component that adjusts the viscosity of the glass, but if it exceeds 10%, the liquidus temperature of the glass rises, making it difficult to mold.
[0019]
CaO is a component that increases the durability of the glass and adjusts the viscosity. However, if it is less than 5%, the durability of the glass is lowered, and if it exceeds 15%, the liquidus temperature of the glass is increased.
[0020]
If the total of MgO and CaO is less than 5%, the durability of the glass is lowered, and if it exceeds 15%, the liquidus temperature of the glass is increased.
[0021]
Na 2 O is a glass melting accelerator, but if it is less than 10%, it is difficult to melt the glass, and if it exceeds 18%, the durability of the glass decreases.
[0022]
K 2 O is a glass melting accelerator like Na 2 O, but it is not preferable to exceed 5% because the raw material is expensive.
[0023]
If the total of Na 2 O and K 2 O is less than 10%, it becomes difficult to melt the glass, and if it exceeds 20%, the durability of the glass decreases.
[0024]
Iron oxide in the glass exists in the state of Fe 2 O 3 and FeO. Fe 2 O 3 absorbs ultraviolet rays, and FeO absorbs infrared rays. If the iron oxide converted to Fe 2 O 3 is less than 0.8%, the ultraviolet and infrared absorbing ability of the glass is lowered, and if it is 0.9% or more, the visible light transmittance of the glass is lowered.
[0025]
TiO 2 absorbs ultraviolet rays. When TiO 2 is less than 0.2%, the effect of ultraviolet absorption is small, and when TiO 2 exceeds 1.0%, the visible light transmittance of the glass is lowered.
[0026]
CoO and Se are components that color the glass in neutral gray. If the CoO is less than 0.003%, the stimulus purity of the glass is too high to become neutral gray. Glass is blue 006% or more.
[0027]
Se is not glass to neutral gray is less than 0.00 11%, a visible light transmittance of the glass decreases exceeds 0.005%.
[0028]
The neutral gray glass composition according to the present invention contains Li 2 O, B 2 O 3 , BaO, ZnO, and ZrO 2 in a total amount of 2% by mass or less in a range not impairing the gist of the present invention in addition to the above components. It can be included. Further, a total of 1% by mass or less of refining agents such as SO 3 , Sb 2 O 3 , As 2 O 3 , and Cl can be contained.
[0029]
【Example】
Hereinafter, the present invention will be described in detail with reference to the tables.
[0030]
(Example)
Table 1 shows examples of the present invention. In Table 1, T-Fe 2 O 3 represents total iron oxide converted to Fe 2 O 3 . Y C is the visible light transmittance (according to the C light source), TG is the solar radiation transmittance, T UV is the solar ultraviolet transmittance, λ d is the dominant wavelength (according to the C light source), and Pe is the stimulation purity. Respectively (with C light source).
[0031]
[Table 1]
Figure 0003703514
[0032]
In the production of glass, silica sand, feldspar, limestone, dolomite, soda ash, mirabilite, carbon, petal, titanium oxide, cobalt oxide, and selenium are prepared and mixed in an electric furnace according to the target composition. Heated and melted. The glass was poured out and molded, and then slowly cooled to room temperature. The slowly cooled glass was cut into a predetermined size and polished to prepare a sample for measuring optical characteristics having a thickness of 3.9 mm, and the optical characteristics were measured using a standard light source C with a 2 ° visual field. The solar ultraviolet transmittance was determined from the spectral transmittance of 295 to 400 nm of solar radiation energy when the air mass was 2.
[0033]
As is apparent from Table 1, the glass of the example of the present invention has a visible light transmittance Y C which is low even though the solar transmittance T G is 40% or less and the solar ultraviolet transmittance T UV is 30% or less. There is no problem in looking outside from the inside of the glass.
[0034]
(Comparative example)
Table 2 shows a comparative example for the present invention. In Comparative Example 9, since CoO and Se exceed the range of the present invention, the visible light transmittance Y C becomes too low, which is not preferable. Comparative Example 10 is not preferable because T-Fe 2 O 3 (total iron) is less than the range of the present invention, and the solar transmittance T G and the solar ultraviolet transmittance T UV become too high. Comparative Example 11 is not preferable because T-Fe 2 O 3 (total iron) exceeds the range of the present invention, and the visible light transmittance Y C becomes too low. Since Comparative Example 12 does not contain TiO 2 , the solar ultraviolet transmittance T UV is increased, which is not preferable.
[0035]
[Table 2]
Figure 0003703514
[0036]
【effect】
As described in detail above, the neutral gray glass composition according to the present invention has a relatively high visible light transmittance, a low solar ultraviolet transmittance and a solar radiation transmittance, and a low stimulus purity. Is preferred.

Claims (1)

質量％で表示して本質的に、
６５〜８０％のＳｉＯ2、
０〜５％のＡｌ2Ｏ3、
０〜１０％のＭｇＯ、
５〜１５％のＣａＯ、
１０〜１８％のＮａ2Ｏ、
０〜５％のＫ2Ｏ、
５〜１５％のＭｇＯ＋ＣａＯ、
１０〜２０％のＮａ2Ｏ＋Ｋ2Ｏ、
０．８％以上０．９％未満のＦｅ2Ｏ3に換算した酸化鉄、
０．２〜１．０％のＴｉＯ2、
０．００３以上０．００６％未満のＣｏＯ、
０．００１１〜０．００５％のＳｅ
からなり、
板厚３．９ｍｍのガラスでの日射透過率が４０％以下で、
且つ太陽紫外線透過率が３０％以下である
ことを特徴とする中性灰色ガラス組成物。Essentially expressed in mass%
65% to 80% of SiO 2,
0 to 5% Al 2 O 3,
0-10% MgO,
5-15% CaO,
10-18% Na 2 O,
0-5% K 2 O,
5-15% MgO + CaO,
10-20% Na 2 O + K 2 O,
Iron oxide converted to Fe 2 O 3 of 0.8% or more and less than 0.9%,
0.2% to 1.0% of TiO 2,
0.003 or 0.0 06% less than CoO,
0.00 11 to 0.005% of Se
Consists of
The solar transmittance in glass with a plate thickness of 3.9 mm is 40% or less,
A neutral gray glass composition having a solar ultraviolet transmittance of 30% or less .
JP31014494A 1994-12-14 1994-12-14 Neutral gray glass composition Expired - Fee Related JP3703514B2 (en)

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Application Number Priority Date Filing Date Title
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JP3703514B2 true JP3703514B2 (en) 2005-10-05

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR018150A1 (en) 1998-03-16 2001-10-31 Ppg Ind Ohio Inc COMPOSITION OF ABSORBENT GLASS OF INFRARED AND ULTRAVIOLET RADIATION, OF BRONZE COLOR, FOR THE MANUFACTURE OF PRIVACY GLASSING AUTOMOTIVE VEHICLES, FLAT GLASS SHEET MADE IN THIS COMPOSITION AND CARD WINDOW MADE IN THIS SHEET.
US6953758B2 (en) 1998-05-12 2005-10-11 Ppg Industries Ohio, Inc. Limited visible transmission blue glasses
US6656862B1 (en) 1998-05-12 2003-12-02 Ppg Industries Ohio, Inc. Blue privacy glass
WO2001034531A1 (en) * 1999-11-11 2001-05-17 Nippon Sheet Glass Co., Ltd. Flat glass to be tempered

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