JPH0444615B2 - - Google Patents
Info
- Publication number
- JPH0444615B2 JPH0444615B2 JP59195805A JP19580584A JPH0444615B2 JP H0444615 B2 JPH0444615 B2 JP H0444615B2 JP 59195805 A JP59195805 A JP 59195805A JP 19580584 A JP19580584 A JP 19580584A JP H0444615 B2 JPH0444615 B2 JP H0444615B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- solubility
- water resistance
- alkali
- cao
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011521 glass Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims 1
- 229910052783 alkali metal Inorganic materials 0.000 description 5
- 150000001340 alkali metals Chemical class 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010828 elution Methods 0.000 description 3
- 239000005357 flat glass Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005191 phase separation Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004031 devitrification Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000006066 glass batch Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102000010029 Homer Scaffolding Proteins Human genes 0.000 description 1
- 108010077223 Homer Scaffolding Proteins Proteins 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 238000006124 Pilkington process Methods 0.000 description 1
- 229910018967 Pt—Rh Inorganic materials 0.000 description 1
- 206010040925 Skin striae Diseases 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、アルカリ金属の溶出量が極めて少な
い耐水性の改善されたガラスに関する。〔従来の
技術〕
液晶表示素子、太陽電池等のエレクトロニクス
部材の基材にアルカリ金属の溶出が極めて少ない
ガラスが要望されている。
このようなガラスとしては、例えばSiO2 49
％，Al2O3 10％，B2O3 15％及びBaO 25％か
らなる無アルカリガラス又はSiO2 81％，Al2O3
２％，B2O3 13％及びNa2Ｏ ４％からなる
低アルカリガラスが知られている。
〔発明の解決しようとする問題点〕
かゝる無アルカリガラス、低アルカリガラス
は、ガラス化するのに極めて高い温度が必要であ
り、清澄にも高い温度が必要であるため、窓ガラ
ス等の生産に使用されるような生産性に優れた槽
窯を用いることは難かしく、生産性の低いルツボ
等を用いて溶融しなければならないという問題点
があつた。また、生産性に優れたフロート法によ
り板ガラスを成型するには成型温度が高くなり過
ぎて実質的にそれができないという問題点があつ
た。更に、無アルカリガラスには溶解性を改善す
るためAS2O3が添加されており、このAS2O3は還
元雰囲気中により還元され白濁化するので、無ア
ルカリガラスは生産性に優れたフロート法を使用
できないという問題点を有していた。
〔問題を解決するための手段〕
本発明は、前述の問題点を解決すべくなされた
ものであり、SiO2−Al2O3−B2O3系ガラスにお
いて、重量％表示で実質的にSiO2 65〜79，Al2
O3 2.5〜９，B2O3 ５〜10，BaO ２〜10，
Na2Ｏ ３〜9.5，K2Ｏ ０〜５，Na2Ｏ＋K2Ｏ
３〜9.5，CaO ０〜３，MgO ０〜２，CaO＋
MgO ０〜３，ZnO 0.5〜３，Li2O0〜１からな
ることを特徴とする耐水性の改善されたガラスを
提供するものである。
本発明における各成分の限定理由は次の通りで
ある。
SiO2は、ガラスのネツトワークホーマーであ
り、65％未満では、ガラスの耐候性が悪く、79％
を越えるとガラスの溶解性が悪くなるので、いず
れも好ましくない。SiO2は上記範囲中68〜74％
の範囲がより望ましい。Al2O3は、ガラスの耐候
性を向上させる作用があり、2.5％未満では分相
を生じ耐候性が悪く、10％を越えるとガラスの溶
解性が悪くなり、いずれも好ましくない。Al2O3
は上記範囲中３〜７％の範囲がより望ましい。
B2O3は10％を越えるとガラスの分相、失透が生
じ易く耐候性も悪くなるので好ましくない。一
方、５％未満では溶解性及び成型性が低下するの
で好ましくない。BaOはガラス溶解時にフラツ
クスとして作用するが、10％を越えると失透を生
じ易く、２％未満では耐候性が悪くなり、いずれ
も好ましくない。CaOは上記範囲中３〜８％の範
囲がより望ましい。Na2Ｏはガラスの溶解時にフ
ラツクスとして作用し、３％未満では溶解性が悪
く、9.5％を越えると耐水性が悪くなり、いずれ
も好ましくない。Na2Ｏは上記範囲中４〜７％の
範囲がより望ましい。K2Ｏは必須成分ではない
が、添加することによりガラスの溶解性を向上す
ることができる。しかし、K2Ｏは高価であるの
で５％を越える添加は好ましくない。K2Ｏは上
記範囲中0.2〜１％の範囲がより望ましい。また、
Na2Ｏ＋K2Ｏ＞9.5％では耐候性が悪くなるので
好ましくない。Na2Ｏ＋K2Ｏは上記範囲中4.2〜
８％の範囲が望ましい。CaO及びMgOは必須成
分ではないが、添加することにより耐水性を向上
することができるが、単独で３％、合量で３％を
越えると分相が生じ耐候性が悪くなるので好まし
くない。上記範囲中より望ましい範囲はCaO 0.2
〜２％、MgO ０〜0.5％である。尚、CaO及び
MgOは併用することにより上記耐水性が相乗的
に向上するので特に望ましい。
ZnOは含有することにより耐水性を向上するこ
とができる。ZnOの含有量が0.5％未満では、そ
れによる効果がほとんどなく、３％を超えると、
溶解性が低下する。
Li2Ｏは、溶解性及び耐水性を向上する効果が
あるが高価であるため１％を越える添加は好まし
くない。
本発明によるガラスは上記成分で97％以上を占
め、残り３％未満については、着色剤等を含有す
ることができる。
本発明によるガラスは、例えば次のようにして
製造することができる。目標組成となるように各
原料を調合し、これを投入口より炉内へ供給し溶
融する。この炉にはフロート成形装置が接続さ
れ、溶融ガラスはこのフロート成形装置により連
続的に板ガラスに成形される。
〔実施例〕
表１に示した９種類の組成を常法に従い調合混
合し、ガラスバツチを調整した。次いで、容量約
300mlのPt−Rh10％坩堝にこのガラスバツチを入
れ1500℃に保持された電気炉中で約４時間溶融し
たガラスの均質性を得るため溶融過程で約１時間
の攪拌を実施したカーボン板上に流し出しガラス
サンプルを得た。
一方、比較のため、本発明以外のガラスも同様
にして製造した。これらの組成も表１に記載し
た。
これらのガラスについて、JISR−3502による
アルカリ金属の溶出量、粘性及び溶解性を測定
し、その結果を表１に併記した。
同表より明らかなように本発明によるガラス
は、アルカリ金属の溶出量が極めて少なく耐水性
に優れると共に粘性がフロート成形に可能な程度
に低く（10gη＝４が1200℃以下であれば、現有
設備で成形できる）、かつ溶解性にも優れている。
尚、溶解性については、目視によつて泡、脈
理、スカムの観察されないものを良とし、これら
の１つ以上が観察されたものを不良とした。
〔発明の効果〕
本発明によるガラスは、アルカリ金属の溶出量
が少なく耐水性に優れ、かつフロート成形が可能
なため生産性に極めて優れている。
【表】DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a glass with improved water resistance and an extremely small amount of alkali metal eluted. [Prior Art] There is a demand for glass that exhibits very little elution of alkali metals as a base material for electronic components such as liquid crystal display elements and solar cells. Examples of such glasses include SiO 2 49
%, Al 2 O 3 10%, B 2 O 3 15% and BaO 25% or alkali-free glass consisting of SiO 2 81%, Al 2 O 3
A low alkali glass consisting of 2% B 2 O 3 , 13% B 2 O 3 and 4% Na 2 O is known. [Problems to be solved by the invention] Such alkali-free glass and low-alkali glass require extremely high temperatures to vitrify, and high temperatures are also required for fining, so they cannot be used for window glass, etc. It is difficult to use a tank kiln with excellent productivity, which is used for production, and there is a problem in that melting must be performed using a crucible or the like with low productivity. In addition, there was a problem in that the molding temperature was too high to mold plate glass using the float method, which has excellent productivity, making it practically impossible. Furthermore, AS 2 O 3 is added to alkali-free glass to improve solubility, and this AS 2 O 3 is reduced and becomes cloudy in a reducing atmosphere, so alkali-free glass is a highly productive float. The problem was that the law could not be used. [Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and in SiO 2 −Al 2 O 3 −B 2 O 3 based glass, substantially SiO2 65~79, Al2
O 3 2.5~9, B 2 O 3 5~10, BaO 2~10,
Na 2 O 3-9.5, K 2 O 0-5, Na 2 O + K 2 O
3-9.5, CaO 0-3, MgO 0-2, CaO+
The present invention provides a glass with improved water resistance characterized by comprising 0 to 3 of MgO, 0.5 to 3 of ZnO, and 0 to 1 of Li2O . The reasons for limiting each component in the present invention are as follows. SiO 2 is a network homer of glass; less than 65%, the weather resistance of the glass is poor, and 79%
Exceeding this is not preferable because the solubility of the glass deteriorates. SiO2 is 68-74% in the above range
is more desirable. Al 2 O 3 has the effect of improving the weather resistance of glass, and if it is less than 2.5%, phase separation occurs and the weather resistance is poor, and if it exceeds 10%, the solubility of the glass becomes poor, both of which are not preferred. Al2O3 _
is more preferably in the range of 3 to 7% in the above range.
If B 2 O 3 exceeds 10%, phase separation and devitrification of the glass tend to occur and weather resistance deteriorates, which is not preferable. On the other hand, if it is less than 5%, solubility and moldability decrease, which is not preferable. BaO acts as a flux during glass melting, but if it exceeds 10%, devitrification tends to occur, and if it is less than 2%, weather resistance deteriorates, both of which are not preferred. More preferably, CaO is in the range of 3 to 8% in the above range. Na 2 O acts as a flux when glass is melted, and if it is less than 3%, the solubility will be poor, and if it exceeds 9.5%, the water resistance will be poor, both of which are not preferred. More preferably, Na 2 O is in the range of 4 to 7% within the above range. Although K 2 O is not an essential component, adding it can improve the solubility of glass. However, since K 2 O is expensive, it is not preferable to add more than 5%. More preferably, K 2 O is in the range of 0.2 to 1% within the above range. Also,
If Na 2 O+K 2 O>9.5%, weather resistance deteriorates, which is not preferable. Na 2 O + K 2 O is 4.2 to 4.2 in the above range
A range of 8% is desirable. Although CaO and MgO are not essential components, water resistance can be improved by adding them, but if they exceed 3% individually or 3% in total, phase separation occurs and weather resistance deteriorates, which is not preferable. The more desirable range among the above ranges is CaO 0.2
~2%, MgO 0-0.5%. Furthermore, CaO and
MgO is particularly desirable since the above water resistance is synergistically improved when used in combination. Water resistance can be improved by containing ZnO. If the ZnO content is less than 0.5%, there will be little effect, and if it exceeds 3%,
Solubility decreases. Although Li 2 O has the effect of improving solubility and water resistance, it is expensive, so it is not preferable to add more than 1%. The glass according to the present invention contains 97% or more of the above-mentioned components, and the remaining less than 3% may contain a coloring agent or the like. The glass according to the present invention can be manufactured, for example, as follows. Each raw material is mixed to achieve the target composition, and then fed into the furnace through the inlet and melted. A float forming device is connected to this furnace, and the molten glass is continuously formed into plate glass by this float forming device. [Example] Nine types of compositions shown in Table 1 were prepared and mixed according to a conventional method to prepare glass batches. Then, the capacity is approx.
This glass batch was placed in a 300 ml Pt-Rh 10% crucible and melted for about 4 hours in an electric furnace maintained at 1500°C.To obtain glass homogeneity, stirring was performed for about 1 hour during the melting process.The glass batch was poured onto a carbon plate. A sample of extracted glass was obtained. On the other hand, for comparison, glasses other than those of the present invention were also manufactured in the same manner. Their compositions are also listed in Table 1. Regarding these glasses, the elution amount, viscosity, and solubility of alkali metals were measured according to JISR-3502, and the results are also listed in Table 1. As is clear from the same table, the glass according to the present invention has extremely low elution amount of alkali metals, excellent water resistance, and low viscosity to the extent that float molding is possible. ) and has excellent solubility. Regarding the solubility, those in which no bubbles, striae, or scum were visually observed were evaluated as good, and those in which one or more of these were observed were evaluated as poor. [Effects of the Invention] The glass according to the present invention has a small amount of alkali metal eluted, has excellent water resistance, and can be float molded, so it has extremely high productivity. 【table】
Claims (1)
量％表示で実質的にSiO2 65〜79，Al2O3 2.5〜
９，B2O3 ５〜10，BaO ２〜10，Na2Ｏ ３〜
9.5，K2Ｏ ０〜５，Na2Ｏ＋K2Ｏ ３〜9.5，
CaO ０〜３，MgO ０〜２，CaO＋MgO ０〜
３，ZnO 0.5〜３，Li2O0〜１からなることを特
徴とする耐水性の改善されたガラス。1 In SiO 2 −Al 2 O 3 −B 2 O 3 glass, SiO 2 is substantially 65 to 79 and Al 2 O 3 is 2.5 to 79 by weight.
9, B 2 O 3 5-10, BaO 2-10, Na 2 O 3-
9.5, K2O 0~5, Na2O + K2O 3~9.5,
CaO 0~3, MgO 0~2, CaO+MgO 0~
3. A glass with improved water resistance characterized by comprising 0.5 to 3 ZnO and 0 to 1 Li 2 O.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19580584A JPS6177638A (en) | 1984-09-20 | 1984-09-20 | Glass improved in water resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19580584A JPS6177638A (en) | 1984-09-20 | 1984-09-20 | Glass improved in water resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6177638A JPS6177638A (en) | 1986-04-21 |
| JPH0444615B2 true JPH0444615B2 (en) | 1992-07-22 |
Family
ID=16347271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19580584A Granted JPS6177638A (en) | 1984-09-20 | 1984-09-20 | Glass improved in water resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6177638A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2696441B1 (en) * | 1992-10-02 | 1994-12-16 | Saint Gobain Vitrage Int | Desalkalinization of glass sheets with low alkali content. |
| WO2016093176A1 (en) * | 2014-12-10 | 2016-06-16 | 日本電気硝子株式会社 | Glass for medicine container and glass tube for medicine container |
| DE102019135597A1 (en) * | 2019-12-20 | 2021-06-24 | Schott Ag | Thermally toughenable borosilicate glasses |
| CN113735438B (en) * | 2021-09-23 | 2023-06-16 | 成都光明光电股份有限公司 | Glass composition |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724532A (en) * | 1980-07-19 | 1982-02-09 | Osaka City | Wet type electrolytic condenser |
-
1984
- 1984-09-20 JP JP19580584A patent/JPS6177638A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724532A (en) * | 1980-07-19 | 1982-02-09 | Osaka City | Wet type electrolytic condenser |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6177638A (en) | 1986-04-21 |
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