JPS6328859B2 - - Google Patents
Info
- Publication number
- JPS6328859B2 JPS6328859B2 JP56197690A JP19769081A JPS6328859B2 JP S6328859 B2 JPS6328859 B2 JP S6328859B2 JP 56197690 A JP56197690 A JP 56197690A JP 19769081 A JP19769081 A JP 19769081A JP S6328859 B2 JPS6328859 B2 JP S6328859B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- chemical durability
- less
- bao
- exceeds
- 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
Links
- 239000011521 glass Substances 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 238000004031 devitrification Methods 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 4
- 238000010292 electrical insulation Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000006025 fining agent Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 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
- C03C3/083—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
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
本発明は、鉛を含有せず、環状及び直管状螢光
灯のガラス管球に使用することのできる加工性に
優れたガラス組成物に関する。
従来の直管螢光灯用ガラスは環状螢光灯の曲げ
加工工程に適用した場合、曲げ加工性が悪く、ガ
ラス中に含有されているアルカリ金属酸化物のガ
ラス表面移動により、著しく螢光体の機能を劣化
される。従つて、直管螢光灯にはソーダライムガ
ラスが用いられているのに対し、PbO含有ガラス
が環状用として使われていたが、高価な原料費、
有害性の問題があり、加工性の良い無鉛ガラスが
望まれている。
一方、環状螢光灯用ガラスとして要求される特
性としては、曲げ加工が容易であること、その他
螢光灯用ガラスとして要求される特性、ガラス製
造上要求される特性があり、これらの要求される
特性をガラスの物性に置き換えると、次のように
なる。
WRI：180℃以上
α（０−300℃）：91〜105×10-7℃-1
失透性：粘度が104ポイズの温度で失透しないこ
と
化学的耐久性：0.9mg以下
ここで、WRI（Working Range Index）とは、
作業温度範囲の巾を示し、ガラスの軟化点と徐冷
点との温度差を用いている。αは熱膨脹係数を表
し、ステムガラスとの封着の為、上記の範囲にあ
ることが必要である。失透性についてはガラスの
粘度（η）が104ポイズである温度（いわゆる作
業温度）で失透しないこと。これはガラス管の成
形作業の安定のため必要である。化学的耐久性
は、JIS−Ｒ−3502に規定されたアルカリ溶出試
験においてR2O（Na2O、K2O、Li2O）の溶出量
が0.9mg以下を必要とする。
本発明者は、PbOを含有せずに上記物性を満足
するガラス組成を見い出した。本発明ガラス組成
物は上記物性内で640〜710℃の軟化点を有し、曲
げ加工性が良好である。
本発明の螢光灯用ガラスは重量％表示で
SiO2 60−75％
Al2O3 １−４％
Li2O ０−２％
Na2O
K2O 13−20％
CaO
MgO ４−13％
BaO 0.5−３％
ZnO 0.1−２％
B2O3 ０−６％
Sb2O3
As2O3 ０−１％
の組成を有する。
次にガラス組成範囲の限定理由を説明する。
SiO2が60％より少ないと化学的耐久性及び電
気絶縁性が悪化し、75％より多いと、熔融及び加
工が困難となり、また、失透が生じやすくなる。
Al2O3は、１％より少ないと化学的耐久性が悪く
なり、４％を越えると粘性の上昇により熔融、加
工が共に困難となる。Na2O＋K2Oが13％より少
ないと熱膨脹係数が小さくなり過ぎ、ステムガラ
スとの封着が困難となる。
20％より多くなると逆に熱膨脹係数が大きくな
り過ぎ、更に、電気絶縁性も悪化する。CaOと
MgOは、化学的耐久性と電気絶縁性を向上させ
るが、その合計量が13％を越えると作業温度範囲
が狭くなり、曲げ加工が困難となる。
BaOは、曲げ加工性、化学的耐久性向上のた
め必須成分である。BaOが0.5％より少ないと作
業温度範囲が狭くなり、３％を越えると加工時の
失透が問題となる。ZnOは、化学的耐久性を向上
させ、螢光体の機能劣化の原因となるアルカリの
表面移動を抑制するための必須成分である。0.1
％以上の範囲で効果を有するが、２％を越えると
急激に失透温度が高くなり加工時の失透が問題と
なる。B2O3は、高温粘性を低下させるが、６％
を越えると熔融時にスカムを発生しやすくなるた
め、６％以内にしなければならない。Li2Oは、
要求物性を調整するために添加可能であるが、２
％を越えると化学的耐久性が悪化する。また、原
料費を高くしないためにも含有量は少なくすべき
である。その他清澄剤として通常ガラスに添加さ
れるSb2O3及び／又はAs2O3が１％以下添加され
うる。
以上の成分のより好ましい含有範囲は次の通り
である。
SiO2 63−72重量％
Al2O3 1.5−3.5 〃
Li2O ０−1.5 〃
Na2O
K2O 14−18 〃
CaO
MgO ６−12 〃
BaO 0.5−2.5 〃
ZnO 0.1−1.5 〃
B2O3 ０−４ 〃
Sb2O3
As2O3 ０−0.7 〃
実施例
The present invention relates to a glass composition that does not contain lead and has excellent processability and can be used in glass bulbs for annular and straight tube fluorescent lamps. When conventional glass for straight tube fluorescent lamps is applied to the bending process of annular fluorescent lamps, it has poor bending properties, and the movement of alkali metal oxides contained in the glass onto the glass surface causes significant damage to the phosphor. The function is deteriorated. Therefore, while soda lime glass is used for straight tube fluorescent lamps, PbO-containing glass has been used for ring tubes, but due to the high raw material costs and
There is a problem of toxicity, and lead-free glass with good workability is desired. On the other hand, the characteristics required for glass for circular fluorescent lamps include ease of bending, other characteristics required for glass for fluorescent lamps, and characteristics required for glass manufacturing. If we replace the properties of glass with the physical properties of glass, we get the following. WRI: 180℃ or higher α (0-300℃): 91 to 105 x 10 -7 ℃ -1 Devtrification: Must not devitrify at a temperature of 104 poise Chemical durability: 0.9mg or less Here, What is WRI (Working Range Index)?
It indicates the width of the working temperature range and uses the temperature difference between the softening point and annealing point of the glass. α represents the coefficient of thermal expansion, which must be within the above range for sealing with the stem glass. Regarding devitrification, it should not devitrify at a temperature where the viscosity (η) of the glass is 10 4 poise (so-called working temperature). This is necessary to stabilize the glass tube molding operation. Chemical durability requires that the amount of R 2 O (Na 2 O, K 2 O, Li 2 O) eluted is 0.9 mg or less in an alkali elution test specified in JIS-R-3502. The present inventors have discovered a glass composition that satisfies the above physical properties without containing PbO. The glass composition of the present invention has a softening point of 640 to 710°C within the above-mentioned physical properties, and has good bending workability. The fluorescent lamp glass of the present invention is expressed in weight percentage: SiO 2 60-75% Al 2 O 3 1-4% Li 2 O 0-2% Na 2 O K 2 O 13-20% CaO MgO 4-13% BaO It has a composition of 0.5-3% ZnO 0.1-2% B 2 O 3 0-6% Sb 2 O 3 As 2 O 3 0-1%. Next, the reason for limiting the glass composition range will be explained. If the SiO 2 content is less than 60%, chemical durability and electrical insulation properties will deteriorate, and if it is more than 75%, melting and processing will be difficult and devitrification will likely occur.
When Al 2 O 3 is less than 1%, the chemical durability deteriorates, and when it exceeds 4%, the viscosity increases, making both melting and processing difficult. If Na 2 O + K 2 O is less than 13%, the coefficient of thermal expansion becomes too small, making sealing with stem glass difficult. If it exceeds 20%, the coefficient of thermal expansion will become too large, and furthermore, the electrical insulation will deteriorate. CaO and
MgO improves chemical durability and electrical insulation, but when the total amount exceeds 13%, the working temperature range becomes narrow and bending becomes difficult. BaO is an essential component for improving bending workability and chemical durability. If BaO is less than 0.5%, the working temperature range will be narrow, and if it exceeds 3%, devitrification during processing will become a problem. ZnO is an essential component for improving chemical durability and suppressing surface migration of alkali, which causes functional deterioration of the phosphor. 0.1
% or more, but if it exceeds 2%, the devitrification temperature rises rapidly and devitrification during processing becomes a problem. B 2 O 3 reduces high temperature viscosity, but 6%
If it exceeds 6%, scum is likely to be generated during melting, so it must be kept within 6%. Li2O is
It can be added to adjust the required physical properties, but 2
%, chemical durability deteriorates. In addition, the content should be small in order to avoid increasing raw material costs. In addition, 1% or less of Sb 2 O 3 and/or As 2 O 3 , which are usually added to glass, may be added as a fining agent. More preferable content ranges of the above components are as follows. SiO 2 63−72% by weight Al 2 O 3 1.5−3.5 〃 Li 2 O 0−1.5 〃 Na 2 O K 2 O 14−18 〃 CaO MgO 6−12 〃 BaO 0.5−2.5 〃 ZnO 0.1−1.5 〃 B 2 O 3 0-4 〃 Sb 2 O 3 As 2 O 3 0-0.7 〃 Example
【表】【table】
【表】 失透性【table】 devitrification
Claims (1)
灯用ガラス。[Claims] 1. SiO 2 60-75% Al 2 O 3 1-4% Li 2 O 0-2% Na 2 O K 2 O 13-20% CaO MgO 4-13% BaO 0.5- A fluorescent lamp glass having a composition of 3% ZnO 0.1-2% B 2 O 3 0-6% Sb 2 O 3 As 2 O 3 0-1%. 2 In weight%: SiO 2 63-72% Al 2 O 3 1.5-3.5% Li 2 O 0-1.5% Na 2 O K 2 O 14-18% CaO MgO 6-12% BaO 0.5-2.5% ZnO 0.1-1.5 % B 2 O 3 0-4% Sb 2 O 3 As 2 O 3 0-0.7%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19769081A JPS5899138A (en) | 1981-12-10 | 1981-12-10 | Glass for fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19769081A JPS5899138A (en) | 1981-12-10 | 1981-12-10 | Glass for fluorescent lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5899138A JPS5899138A (en) | 1983-06-13 |
| JPS6328859B2 true JPS6328859B2 (en) | 1988-06-10 |
Family
ID=16378725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19769081A Granted JPS5899138A (en) | 1981-12-10 | 1981-12-10 | Glass for fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5899138A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0234746U (en) * | 1988-08-30 | 1990-03-06 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR900003079A (en) * | 1988-08-17 | 1990-03-23 | 한형수 | Manufacturing method of crystallized glass for building materials |
| JP4071480B2 (en) * | 2001-08-31 | 2008-04-02 | 松下電器産業株式会社 | Glass composition for lamp, lamp stem and bulb using the same, and lamp using the same |
-
1981
- 1981-12-10 JP JP19769081A patent/JPS5899138A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0234746U (en) * | 1988-08-30 | 1990-03-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5899138A (en) | 1983-06-13 |
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