JP3900550B2 - UV absorbing green glass - Google Patents
UV absorbing green glass Download PDFInfo
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- JP3900550B2 JP3900550B2 JP10733696A JP10733696A JP3900550B2 JP 3900550 B2 JP3900550 B2 JP 3900550B2 JP 10733696 A JP10733696 A JP 10733696A JP 10733696 A JP10733696 A JP 10733696A JP 3900550 B2 JP3900550 B2 JP 3900550B2
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- 239000011521 glass Substances 0.000 title claims description 45
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 71
- 238000002834 transmittance Methods 0.000 claims description 43
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 11
- 229910052684 Cerium Inorganic materials 0.000 claims description 7
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000005361 soda-lime glass Substances 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 239000002994 raw material Substances 0.000 description 9
- 239000005357 flat glass Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 239000006060 molten glass Substances 0.000 description 4
- 230000000638 stimulation Effects 0.000 description 4
- 238000004031 devitrification Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910018871 CoO 2 Inorganic materials 0.000 description 1
- 238000006124 Pilkington process Methods 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- GHLITDDQOMIBFS-UHFFFAOYSA-H cerium(3+);tricarbonate Chemical compound [Ce+3].[Ce+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O GHLITDDQOMIBFS-UHFFFAOYSA-H 0.000 description 1
- UNJPQTDTZAKTFK-UHFFFAOYSA-K cerium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Ce+3] UNJPQTDTZAKTFK-UHFFFAOYSA-K 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- -1 etc. Chemical compound 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000006025 fining agent Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000005340 laminated glass Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、日射透過率の小さい紫外線吸収グリーンガラスに関する。
【０００２】
【従来の技術】
日射透過率（ＪＩＳ Ｒ３１０６参照）及び紫外線透過率（ＩＳＯ ９０５０参照）を極端に低下した車両用ガラスとして、Ｆｅ2 Ｏ3 に換算したＦｅＯの重量をＦｅ2 Ｏ3 に換算した全鉄の重量の４５％以上にしたソーダライムシリカ系のガラスが知られている（特開昭６４−１８９３８）。このガラスはブルーの色調を有する。
【０００３】
このガラスは、Ｆｅ2 Ｏ3 に換算したＦｅＯの重量がＦｅ2 Ｏ3 に換算した全鉄の重量の４５％以上であるため、清澄剤である芒硝が実質的に清澄作用を行わない。そのため、溶融したガラスを減圧下に保持して脱泡する必要があり、ガラスの溶融工程が複雑であるという課題があった。
【０００４】
また、グリーンの色調を有し、Ｆｅ2 Ｏ3 を０．５１重量％以上含有するソーダライムシリカガラスが、特開平３−１８７９４６に知られている。
【０００５】
すなわち３ｍｍ厚で全鉄：０．６８〜０．９２％（重量％、以下、ガラス組成については同じ）、ＣｅＯ2 ：０．５〜１．２％、ＴｉＯ2 ：０．０２〜０．８５％を含有し、全鉄中の２価の鉄の量２３〜２９％である。また、４ｍｍ厚で全鉄：０．６１〜０．８６％、ＣｅＯ2 ：０．３〜０．７５％、ＴｉＯ2 ：０．０２〜０．４５％を含有し、全鉄中の２価の鉄の量２３〜２９％である。
【０００６】
特開平３−５６４６６には日射透過率及び紫外線透過率を低下させたガラスとして、ソーダライムシリカの母ガラスに重量％表示でＦｅ2 Ｏ3 に換算した全鉄：０．５３〜０．７０％、Ｆｅ2 Ｏ3 ：０．３５〜０．５０％、ＦｅＯ：０．１６〜０．２４％、ＴｉＯ2 ：０．２〜０．４％、ＣｅＯ2 に換算した全セリウム：０．５〜０．８％を含有し、かつ、Ｆｅ2 Ｏ3 に換算したＦｅＯの重量がＦｅ2 Ｏ3 に換算した全鉄の重量の３０〜４０％であるガラスが開示されている。
【０００７】
また、米国特許明細書第２８６００５９号には、Ｆｅ2 Ｏ3 ：０．２０〜０．６０％、ＴｉＯ2 ：０．１９〜１．９０％、ＣｅＯ2 ：０．０５〜０．５０％を含有する無色の紫外線吸収ガラスが開示されている。
【０００８】
しかし、こうしたガラスは紫外線吸収性能が充分満足できるものではないという課題があった。
【０００９】
【発明が解決しようとする課題】
本発明は、従来技術の上記課題を解消し、可視光透過率が７０％以上で、日射透過率が小さく、紫外線透過率、特に波長３７０ｎｍの波長の透過率をさらに小さくした紫外線吸収グリーンガラスの提供を目的とする。
【００１０】
【課題を解決するための手段】
本発明は、重量％で、Ｆｅ2 Ｏ3 で表した全鉄：０．４５〜０．４９１％、ＣｅＯ2 で表した全セリウム：１．０９〜１．２％、ＴｉＯ2 ：０．３〜０．３９％、ＣｏＯ：０〜０．０００３％を含有し、Ｆｅ2 Ｏ3 に換算した全鉄中のＦｅ2 Ｏ3 に換算した２価の鉄の重量割合が３０．５〜３２．０％であるソーダライムシリカガラスから実質的になり、６．０ｍｍの厚さの場合で、標準Ａ光源による可視光透過率が７０％以上であり、紫外線透過率が６．９４％以下であり、波長３７０ｎｍでの光透過率が２０．９％以下であり、５ｍｍ厚に換算した標準Ｃ光源による刺激純度が３％以下である紫外線吸収グリーンガラスである。
【００１１】
【発明の実施の形態】
上記成分について以下に説明する。
Ｆｅ2 Ｏ3 で表した全鉄の含有量が０．４５％より少ないと日射透過率及び紫外線透過率が大きくなりすぎ、０．５２％以上だと可視光透過率が小さくなりすぎる。好ましくは、０．４８〜０．５１％である。この全鉄中における２価の鉄の量が２５％より少ないと日射透過率が高くなりすぎ、３８％より多いとガラスの溶融工程が複雑になるとともに、ブルーの色調になり、目的とするグリーンの色調のガラスが得られない。好ましくは、２７〜３３％である。
【００１２】
ＣｅＯ2 で表した全セリウムの含有量が０．８％より少ないと紫外線透過率、特に人体等に悪影響を与える３７０ｎｍの波長の透過率が大きくなりすぎ、２％より多いと黄色の色調になりグリーンの色調で可視光透過率の大きいガラスが得られないうえ、原料コストが高くなる。また、ガラス製造時の品種を変える際に長時間が必要になり生産性が低下する。好ましくは、０．８〜１．２％である。
【００１３】
ＴｉＯ2 の含有量が０．２％より少ないと紫外線透過率が大きくなりすぎ、０．６％より多いと可視光透過率が小さくなりすぎるとともに、黄色の色調になり、目的とするグリーンの色調のガラスが得られない。好ましくは、０．３〜０．５％である。
【００１４】
ＣｏＯは、必須成分ではないが、微量含有することにより、ＣｅＯ2 、ＴｉＯ2 等により黄色味を帯びるガラスの色調を、目的とするグリーンの色調に調整できる。好ましくは、０．０００２％以上含有する。一方、０．００２％より多いと可視光透過率が小さくなりすぎる。
【００１５】
本発明の紫外線吸収グリーンガラスとしては、特に、実質的に重量％で以下の組成からなるものが好ましい。
ＳｉＯ2 ：６５〜７５％、
Ａｌ2 Ｏ3 ：０．１〜５％、
Ｎａ2 Ｏ＋Ｋ2 Ｏ ：１０〜１８％、
ＣａＯ ：５〜１５％、
ＭｇＯ ：１〜６％、
ＳＯ3 ：０．０５〜１％、
Ｆｅ2 Ｏ3 で表した全鉄：０．４５〜０．４９１％、
ＣｅＯ2 で表した全セリウム：１．０９〜１．２％、
ＴｉＯ2 ：０．３〜０．３９％、
ＣｏＯ ：０〜０．０００３％。
【００１６】
ＳｉＯ2 の含有量が６５％よる少ないと耐候性が低下し、７５％より多いと失透しやすくなる。Ａｌ2 Ｏ3 の含有量が０．１％より少ないと耐水性が低下し、５％より多いと溶解性が低下する。
【００１７】
Ｎａ2 Ｏ、Ｋ2 Ｏは、原料の溶融を促進する成分である。それらの含有量が合量で１０％より少ないとその効果が小さく、１８％より多いと耐候性が悪くなる。
【００１８】
ＣａＯ、ＭｇＯは、原料の溶解を促進し、耐候性を改善する成分である。ＣａＯの含有量が５％より少ないと上述の効果が小さく、１５％よりも多いと失透しやすくなる。ＭｇＯの含有量が１％より少ないと上記効果が少なく、６％より多いと失透しやすくなる。
【００１９】
ＳＯ3 は、清澄剤として用いられ、ガラス中に通常、０．０５〜１％程度残存する。
【００２０】
さらにまた、本発明では、ガラスの比重を２．４９〜２．５３程度に調整することが好ましい。より好ましくは、２．５１〜２．５２である。このように通常のソーダライムシリカガラスと比重が同等になるようにすることによって、製造時の組成変更の効率を向上させ得る。
【００２１】
比重は、母ガラスの組成を調整することによって調整できる。具体的には、重量比ＳｉＯ2 ／（ＭｇＯ＋ＣａＯ）を５．０〜７．０に、より好ましくは、５．４〜６．６にすることによって、比重を調整できる。この重量比は、さらに好ましくは、６．０〜６．６である。
【００２２】
また、この観点では、重量比ＣａＯ／ＭｇＯを好ましくは１．３〜２．５に、より好ましくは１．５〜２．３にする。
【００２３】
本発明による紫外線吸収ガラスは、通常、４．５〜７．０ｍｍの範囲で使用される。また、使用される厚みにおいて、可視光透過率（標準Ａ光源）７０％以上、紫外線透過率１５％以下、特には１０％以下、波長３７０ｎｍの透過率３０％以下である。
【００２４】
また、標準Ｃ光源による透過光の主波長が５１５〜５３５ｎｍであることが好ましく、使用される厚みにおいて、日射透過率３５〜５０％、特には、４０〜４５％であることが好ましい。また、５ｍｍ厚換算で、紫外線透過率１０％以下、刺激純度３％以下、特には２〜３％の特性を有することが好ましい。
【００２５】
本発明の紫外線吸収ガラスは建築用、車両用のいずれにも用いることができるが、可視光透過率が大きいので、自動車の窓ガラスとして好適である。自動車の窓ガラスとして用いる場合、サイドやリヤ用の窓ガラスとしては強化ガラスを用いる。また、建築用の複層ガラスとして用いるときは、本発明のガラス２枚の複層ガラス又は本発明のガラスと他のガラスとの複層ガラスとして用いることができる。
【００２６】
本発明の紫外線吸収ガラスは、例えば、次のようにして製造できる。すなわち、目標とするガラス組成になるように、各原料を調合する。その際に使用する原料としては、ＦｅＯ、Ｆｅ2 Ｏ3 源として、鉄粉、ベンガラ等が、セリウム源として、酸化セリウム、炭酸セリウム、水酸化セリウム等が、チタン源として、酸化チタン等がある。母ガラスの原料としては、通常使用されているものが使用される。さらに、これらの原料に炭素等の還元剤を添加して溶融ガラス中の鉄がＦｅ2 Ｏ3 に酸化されるのを抑制し、ＦｅＯが所定量含有されるようにするのが好ましい。
【００２７】
かくして調合した原料を連続的に溶融炉に供給し、重油等により約１５００℃に加熱し溶融してガラス化する。次いで、この溶融ガラスを清澄した後、フロート法等により所定の厚さの板ガラスに成形する。次いで、この板ガラスを所定の形状に切断することにより本発明の紫外線吸収ガラスが製造される。その後、必要に応じて、切断したガラスを強化処理し、合せガラスに加工し又は複層ガラスに加工できる。
【００２８】
【実施例】
ＳｉＯ2 ：７２部（重量部、以下同じ）、Ａｌ2 Ｏ3 ：１．７部、Ｎａ2 Ｏ：１２．３部、Ｋ2 Ｏ：０．５部、ＣａＯ：７．８部、ＭｇＯ：３．９部及びＳＯ3 ：０．６部からなる母組成に、光学特性改善成分としてＦｅ2 Ｏ3 で表した全鉄（表１ではｔＦｅ2 Ｏ3 と略記、単位：重量％）、ＣｅＯ2 （単位：重量％）、ＴｉＯ2 （単位：重量％）及びＣｏＯ（単位：重量％）を表１の上段に示す量含有するソーダライムシリカガラスを製造した。Ｆｅ2 Ｏ3 に換算した全鉄中のＦｅ2 Ｏ3 に換算した２価の鉄の割合（表１ではREDOX と略記、単位：％）も同欄に併記した。なお、実施例において、重量比ＳｉＯ2 ／（ＭｇＯ＋ＣａＯ）は６．１５、重量比ＣａＯ／ＭｇＯは２．０である。また、表中の例２及び例３は比較例である。
【００２９】
ガラスの製造にあたっては、あらかじめ調合した原料をるつぼに入れ、電気炉中で加熱し、溶融しガラス化した。次いで、溶融ガラスをステンレス板上に流し出し、両面を研磨し厚さ６．０ｍｍの板ガラスを得た。
【００３０】
この板ガラスについて、日射透過率ＴE （単位：％）、可視光透過率（標準Ａ光源によるもの）ＴVa（単位：％）、紫外線透過率Ｔuv（単位：％）、波長３７０ｎｍの光透過率Ｔ370 （単位：％）、標準Ｃ光源による主波長ＤW （単位：ｎｍ）、刺激純度Ｐe （単位：％）、比重を求めた結果を表１の下段に示した。なお、刺激純度Ｐe は厚さ５．０ｍｍに換算した値である。
【００３１】
なお、日射透過率及び可視光透過率はＪＩＳ Ｒ３１０６により、紫外線透過率はＩＳＯ ９０５０により、主波長及び刺激純度はＪＩＳ Ｚ８７２２によりそれぞれ求めた。
【００３２】
表１より明らかなように、本発明のガラスは、グリーンの色調を有し、可視光透過率が大きく、日射透過率が小さく、紫外線透過率が特に小さい。
【００３３】
【表１】
【発明の効果】
本発明によれば、可視光透過率が大きく、紫外線透過率、特に３７０ｎｍの波長の透過率、を小さくしたグリーンの色調のガラスが提供される。こうしたガラスは、自動車用の窓ガラスとして特に適する。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultraviolet absorbing green glass having a low solar transmittance.
[0002]
[Prior art]
Solar transmittance (JIS R3106 see) and ultraviolet transmittance as (ISO 9050 see) extremely reduced glass for a vehicle, and the weight of FeO which in terms of Fe 2 O 3 by weight of the total iron in terms of Fe 2 O 3 A soda-lime-silica glass with 45% or more is known (Japanese Patent Laid-Open No. 64-18938). This glass has a blue color tone.
[0003]
The glass, because the weight of FeO which in terms of Fe 2 O 3 is not less than 45% by weight of the total iron in terms of Fe 2 O 3, sodium sulfate is not performed substantially fining action is fining agent. Therefore, it is necessary to hold the molten glass under reduced pressure to defoam, and there is a problem that the glass melting process is complicated.
[0004]
A soda lime silica glass having a green color tone and containing 0.51% by weight or more of Fe 2 O 3 is known from JP-A-3-187946.
[0005]
That is, with a thickness of 3 mm, total iron: 0.68 to 0.92% (% by weight, hereinafter the same for the glass composition), CeO 2 : 0.5 to 1.2%, TiO 2 : 0.02 to 0.85 %, And the amount of divalent iron in the total iron is 23 to 29%. Also, 4 mm total iron in thickness: 0.61~0.86%, CeO 2: 0.3~0.75 %, TiO 2: it contains 0.02 to 0.45%, divalent Zentetsuchu The amount of iron is 23-29%.
[0006]
In JP-A-3-56466, as a glass with reduced solar transmittance and ultraviolet transmittance, total iron converted to Fe 2 O 3 in terms of wt% on the mother glass of soda lime silica: 0.53 to 0.70% , Fe 2 O 3: 0.35~0.50% , FeO: 0.16~0.24%, TiO 2: 0.2~0.4%, total cerium in terms of CeO 2: 0.5 to containing 0.8%, and glass is disclosed by weight of FeO in terms of Fe 2 O 3 is 30-40% by weight of the total iron in terms of Fe 2 O 3.
[0007]
In addition, US Pat. No. 2860059 includes Fe 2 O 3 : 0.20 to 0.60%, TiO 2 : 0.19 to 1.90%, CeO 2 : 0.05 to 0.50%. A colorless UV-absorbing glass containing is disclosed.
[0008]
However, such a glass has a problem that the ultraviolet absorption performance is not sufficiently satisfactory.
[0009]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems of the prior art, and is a UV-absorbing green glass having a visible light transmittance of 70% or more, a low solar transmittance, and a further reduced UV transmittance, particularly a transmittance at a wavelength of 370 nm. For the purpose of provision.
[0010]
[Means for Solving the Problems]
In the present invention, the total iron represented by Fe 2 O 3 is 0.45 to 0.491 % by weight , the total cerium represented by CeO 2 is 1.09 to 1.2 %, and TiO 2 is 0.3. ~0.39%, CoO: 0~ to 0.0003% by weight percentage of divalent iron in terms of Fe 2 O 3 in the total iron in terms of Fe 2 O 3 is from 30.5 to 32. In the case of a thickness of 6.0 mm, the visible light transmittance with a standard A light source is 70% or more and the ultraviolet transmittance is 6.94 % or less. Yes, it is an ultraviolet absorbing green glass having a light transmittance of 20.9 % or less at a wavelength of 370 nm and a stimulation purity of 3% or less with a standard C light source converted to a thickness of 5 mm .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The above components will be described below.
When the total iron content expressed by Fe 2 O 3 is less than 0.45%, the solar radiation transmittance and the ultraviolet transmittance are too large, and when it is 0.52% or more, the visible light transmittance is too small. Preferably, it is 0.48 to 0.51%. If the amount of divalent iron in the total iron is less than 25%, the solar transmittance becomes too high, and if it exceeds 38%, the glass melting process becomes complicated and the color of blue becomes the target green. The glass of the color tone cannot be obtained. Preferably, it is 27 to 33%.
[0012]
If the content of total cerium expressed by CeO 2 is less than 0.8%, the ultraviolet transmittance, particularly the transmittance at a wavelength of 370 nm, which adversely affects the human body, etc. becomes too large, and if it is more than 2%, the color tone becomes yellow. A glass having a green color tone and a high visible light transmittance cannot be obtained, and the raw material cost increases. Moreover, when changing the kind at the time of glass manufacture, a long time is needed and productivity falls. Preferably, it is 0.8 to 1.2%.
[0013]
When the content of TiO 2 is less than 0.2%, the ultraviolet transmittance is too high, and when it is more than 0.6%, the visible light transmittance is too low and the yellow color tone is obtained. Glass is not obtained. Preferably, it is 0.3 to 0.5%.
[0014]
CoO is not an essential component, but by containing a small amount, CoO 2 , TiO 2, etc. can adjust the color tone of the yellowish glass to the target green color tone. Preferably, it contains 0.0002% or more. On the other hand, if it exceeds 0.002%, the visible light transmittance becomes too small.
[0015]
As the ultraviolet-absorbing green glass of the present invention, those having substantially the following composition in weight% are preferable.
SiO 2 : 65 to 75%,
Al 2 O 3 : 0.1 to 5%,
Na 2 O + K 2 O: 10 to 18%,
CaO: 5 to 15%,
MgO: 1-6%
SO 3 : 0.05 to 1%,
Total iron represented by Fe 2 O 3 : 0.45 to 0.491 %,
Total cerium expressed in CeO 2 : 1.09-1.2 %
TiO 2: 0.3~0.39%,
CoO: 0 to 0.0003 %.
[0016]
When the content of SiO 2 is less than 65%, the weather resistance is lowered, and when it is more than 75%, devitrification tends to occur. When the content of Al 2 O 3 is less than 0.1%, the water resistance decreases, and when it exceeds 5%, the solubility decreases.
[0017]
Na 2 O and K 2 O are components that promote melting of the raw material. When the total content is less than 10%, the effect is small, and when the content is more than 18%, the weather resistance is deteriorated.
[0018]
CaO and MgO are components that promote dissolution of raw materials and improve weather resistance. When the content of CaO is less than 5%, the above-described effect is small, and when the content is more than 15%, devitrification easily occurs. When the content of MgO is less than 1%, the above effect is small, and when it is more than 6%, devitrification is likely to occur.
[0019]
SO 3 is used as a refining agent and usually remains in the glass at about 0.05 to 1%.
[0020]
Furthermore, in the present invention, it is preferable to adjust the specific gravity of the glass to about 2.49 to 2.53. More preferably, it is 2.51 to 2.52. Thus, the efficiency of the composition change at the time of manufacture can be improved by making specific gravity equal to normal soda-lime silica glass.
[0021]
Specific gravity can be adjusted by adjusting the composition of the mother glass. Specifically, the specific gravity can be adjusted by setting the weight ratio SiO 2 / (MgO + CaO) to 5.0 to 7.0, more preferably 5.4 to 6.6. This weight ratio is more preferably 6.0 to 6.6.
[0022]
From this viewpoint, the weight ratio CaO / MgO is preferably 1.3 to 2.5, more preferably 1.5 to 2.3.
[0023]
The ultraviolet absorbing glass according to the present invention is usually used in the range of 4.5 to 7.0 mm. Further, in the thickness used, the visible light transmittance (standard A light source) is 70% or more, the ultraviolet transmittance is 15% or less, particularly 10% or less, and the transmittance at a wavelength of 370 nm is 30% or less.
[0024]
Moreover, it is preferable that the dominant wavelength of the transmitted light by a standard C light source is 515-535 nm, and in the thickness to be used, it is preferable that the solar radiation transmittance is 35-50%, especially 40-45%. Further, in terms of 5 mm thickness, it is preferable to have the characteristics of ultraviolet transmittance of 10% or less and stimulation purity of 3% or less, particularly 2-3%.
[0025]
The ultraviolet-absorbing glass of the present invention can be used for both architectural and vehicle applications, but has a large visible light transmittance, and thus is suitable as a window glass for automobiles. When used as a window glass of an automobile, tempered glass is used as a side or rear window glass. Moreover, when using as a multilayer glass for construction, it can be used as a multilayer glass of two sheets of the glass of the present invention or a glass of the present invention and another glass.
[0026]
The ultraviolet absorbing glass of the present invention can be produced, for example, as follows. That is, each raw material is prepared so that it may become a target glass composition. The raw materials used at that time include FeO, Fe 2 O 3 source, iron powder, bengara, etc., cerium source, cerium oxide, cerium carbonate, cerium hydroxide, etc., titanium source, titanium oxide, etc. . As the raw material for the mother glass, those usually used are used. Furthermore, it is preferable to add a reducing agent such as carbon to these raw materials to suppress oxidation of iron in the molten glass to Fe 2 O 3 so that a predetermined amount of FeO is contained.
[0027]
The raw materials thus prepared are continuously supplied to a melting furnace and heated to about 1500 ° C. with heavy oil or the like to melt and vitrify. Next, the molten glass is clarified and then formed into a sheet glass having a predetermined thickness by a float method or the like. Next, the ultraviolet absorbing glass of the present invention is manufactured by cutting the plate glass into a predetermined shape. Thereafter, if necessary, the cut glass can be tempered and processed into a laminated glass or processed into a multilayer glass.
[0028]
【Example】
SiO 2 : 72 parts (parts by weight, the same applies hereinafter), Al 2 O 3 : 1.7 parts, Na 2 O: 12.3 parts, K 2 O: 0.5 parts, CaO: 7.8 parts, MgO: 3.9 parts and SO 3 : 0.6 parts in a total composition of Fe 2 O 3 as a component for improving optical properties (total abbreviated as tFe 2 O 3 in Table 1, unit: wt%), CeO A soda lime silica glass containing 2 (unit: wt%), TiO 2 (unit: wt%) and CoO (unit: wt%) shown in the upper part of Table 1 was produced. Fe 2 ratio of O 3 2-valent iron in terms of Fe 2 O 3 in the total iron as calculated as (abbreviated as in Table 1 REDOX, unit:%) are also shown in the same column. In the examples, the weight ratio SiO 2 / (MgO + CaO) is 6.15, and the weight ratio CaO / MgO is 2.0. Examples 2 and 3 in the table are comparative examples.
[0029]
In the production of glass, raw materials prepared in advance were put in a crucible, heated in an electric furnace, melted and vitrified. Next, the molten glass was poured out on a stainless steel plate, and both surfaces were polished to obtain a plate glass having a thickness of 6.0 mm.
[0030]
About this plate glass, solar transmittance T E (unit:%), visible light transmittance (by standard A light source) T Va (unit:%), ultraviolet transmittance T uv (unit:%), light transmission with a wavelength of 370 nm The lower part of Table 1 shows the results of calculating the rate T 370 (unit:%), the main wavelength D W (unit: nm), the stimulation purity P e (unit:%), and the specific gravity of the standard C light source. Incidentally, the excitation purity P e is a value converted to a thickness of 5.0 mm.
[0031]
The solar transmittance and the visible light transmittance were determined according to JIS R3106, the ultraviolet transmittance was determined according to ISO 9050, and the dominant wavelength and stimulation purity were determined according to JIS Z8722.
[0032]
As is clear from Table 1, the glass of the present invention has a green color tone, a high visible light transmittance, a low solar transmittance, and a particularly low ultraviolet transmittance.
[0033]
[Table 1]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the glass of the green color tone which has large visible light transmittance | permeability and reduced ultraviolet-ray transmittance, especially the transmittance | permeability of the wavelength of 370 nm is provided. Such glass is particularly suitable as a window glass for automobiles.
Claims (4)
ＳｉＯ2 ：６５〜７５％、
Ａｌ2 Ｏ3 ：０．１〜５％、
Ｎａ2 Ｏ＋Ｋ2 Ｏ ：１０〜１８％、
ＣａＯ ：５〜１５％、
ＭｇＯ ：１〜６％、
ＳＯ3 ：０．０５〜１％、
Ｆｅ2 Ｏ3 で表した全鉄：０．４５〜０．４９１％、
ＣｅＯ2 で表した全セリウム：１．０９〜１．２％、
ＴｉＯ2 ：０．３〜０．３９％、
ＣｏＯ ：０〜０．０００３％。The ultraviolet-absorbing green glass according to claim 1, substantially consisting of the following composition in weight%.
SiO 2 : 65 to 75%,
Al 2 O 3 : 0.1 to 5%,
Na 2 O + K 2 O: 10 to 18%,
CaO: 5 to 15%,
MgO: 1-6%
SO 3 : 0.05 to 1%,
Total iron represented by Fe 2 O 3 : 0.45 to 0.491 %,
Total cerium expressed in CeO 2 : 1.09-1.2 %
TiO 2: 0.3~0.39%,
CoO: 0 to 0.0003 %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10733696A JP3900550B2 (en) | 1996-04-26 | 1996-04-26 | UV absorbing green glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10733696A JP3900550B2 (en) | 1996-04-26 | 1996-04-26 | UV absorbing green glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09295829A JPH09295829A (en) | 1997-11-18 |
| JP3900550B2 true JP3900550B2 (en) | 2007-04-04 |
Family
ID=14456479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10733696A Expired - Fee Related JP3900550B2 (en) | 1996-04-26 | 1996-04-26 | UV absorbing green glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3900550B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9206075B2 (en) | 2012-01-27 | 2015-12-08 | Asahi Glass Company, Limited | Colored glass plate and method for its production |
| US9206072B2 (en) | 2012-01-27 | 2015-12-08 | Asahi Glass Company, Limited | Colored glass plate and method for its production |
| US9206073B2 (en) | 2012-01-27 | 2015-12-08 | Asahi Glass Company, Limited | Colored glass plate and method for its production |
| US9249047B2 (en) | 2012-03-30 | 2016-02-02 | Central Glass Company, Limited | Ultraviolet and infrared absorptive glass |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10265239A (en) * | 1997-03-26 | 1998-10-06 | Nippon Sheet Glass Co Ltd | Ultraviolet ray and infrared ray absorption glass |
| EP1029827A4 (en) * | 1997-11-13 | 2003-07-09 | Nippon Sheet Glass Co Ltd | Ultraviolet/infrared absorbing glass, ultraviolet/infrared absorbing glass sheet, ultraviolet/infrared absorbing glass sheet coated with colored film, and window glass for vehicles |
| EP0979804A4 (en) | 1997-12-26 | 2004-08-04 | Nippon Sheet Glass Co Ltd | Ultraviolet/infrared absorbent glass, ultraviolet/infrared absorbent glass plate, ultraviolet/infrared absorbent glass plate coated with colored film, and window glass for vehicle |
| JP2007290923A (en) * | 2006-04-26 | 2007-11-08 | Nippon Sheet Glass Co Ltd | Laminated glass |
-
1996
- 1996-04-26 JP JP10733696A patent/JP3900550B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9206075B2 (en) | 2012-01-27 | 2015-12-08 | Asahi Glass Company, Limited | Colored glass plate and method for its production |
| US9206072B2 (en) | 2012-01-27 | 2015-12-08 | Asahi Glass Company, Limited | Colored glass plate and method for its production |
| US9206073B2 (en) | 2012-01-27 | 2015-12-08 | Asahi Glass Company, Limited | Colored glass plate and method for its production |
| US9249047B2 (en) | 2012-03-30 | 2016-02-02 | Central Glass Company, Limited | Ultraviolet and infrared absorptive glass |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09295829A (en) | 1997-11-18 |
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