EP1303461A1 - Borosilicate glass with high chemical resistance and use thereof - Google Patents
Borosilicate glass with high chemical resistance and use thereofInfo
- Publication number
- EP1303461A1 EP1303461A1 EP01956543A EP01956543A EP1303461A1 EP 1303461 A1 EP1303461 A1 EP 1303461A1 EP 01956543 A EP01956543 A EP 01956543A EP 01956543 A EP01956543 A EP 01956543A EP 1303461 A1 EP1303461 A1 EP 1303461A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glass
- borosilicate glass
- glasses
- weight
- glass according
- 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.)
- Withdrawn
Links
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
- 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
-
- 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
-
- 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
- C03C4/20—Compositions for glass with special properties for chemical resistant glass
Definitions
- the invention relates to a borosilicate glass of high chemical resistance and its uses.
- An essential parameter for characterizing the processability of a glass is the processing temperature V A , at which the viscosity of the glass is 10 4 dPas. It should be low, since even slight V A reductions lead to a significant reduction in manufacturing costs, since the melting temperatures can be reduced. In addition, the lowest possible V A is also advantageous in the production of the glass-metal fusion, since overheating of the parts to be melted can then be avoided because melting can take place either at a lower temperature or in a shorter time. Finally, when using glasses with a lower V A , it can be avoided that evaporation and recondensation of glass components lead to a malfunction of the fusion and, in the worst case, to leaky fusion.
- the processing interval of a glass ie the temperature difference from the processing temperature V A to the softening temperature E Wl of the temperature at which the viscosity of the Glases 10 7.6 dPas is essential.
- the temperature range in which a glass can be processed is also referred to as the "length" of the glass.
- Glasses which have a very high chemical resistance to acidic and alkaline media and in particular a very high hydroytic resistance are also required for use as pharmaceutical primary packaging such as ampoules or vials.
- a low coefficient of thermal expansion is also advantageous because it ensures good temperature resistance.
- the physicochemical behavior of the glass in its further processing is also important, since it influences the properties of the end product and its possible uses.
- Patent specification DE 42 30 607 C 1 presents chemically highly resistant borosilicate glasses that can be fused with tungsten. They have expansion coefficients ⁇ 2 o3oo of at most 4.5 x 10 "6 / K and, as shown in the examples, processing temperatures> 1210 ° C.
- the borosilicate glasses described in published patent application DE 37 22 130 A1 also have a low elongation of at most 5.0 x 10 "6 / K.
- the glasses of the patent specification DE 44 30 710 C1 have a relatively high SiO 2 content, namely> 75% by weight and> 83% by weight SiO 2 + B 2 O 3 in connection with a nem weight ratio SiO 2 / B 2 O 3 > 8, and little AI 2 O 3 , which makes them chemically highly resistant, but leads to disadvantageously high processing temperatures.
- the glasses of DE 198 42 942 A1 and DE 195 36 708 C1 have a very high chemical resistance belonging to hydrolytic, acid and alkali class 1. However, due to their Zr0 2 proportions, the disadvantages mentioned also apply to them.
- the glass according to the invention has an SiO 2 content of 70 to 77% by weight, preferably 70.5 to 76.5% by weight of SiO 2 . Higher proportions would raise the processing temperature too much and lower the coefficient of thermal expansion too much. If the SiO 2 content were reduced further, the acid resistance in particular would deteriorate. An SiO 2 content of ⁇ 75% by weight is particularly preferred.
- the glass contains 6 to ⁇ 11.5% by weight, preferably 6.5 - ⁇ 11.5% by weight, particularly preferably at most 11% by weight of B 2 O 3 .
- B 2 O 3 leads to a lowering of the processing temperature and the melting temperature with simultaneous improvement hydrolytic resistance.
- B 2 O 3 binds the alkali ions present in the glass more firmly into the glass structure. While the melting temperature would not be lowered far enough and the tendency to crystallize would increase at lower contents, the acid resistance would deteriorate at higher contents.
- the glass according to the invention contains between 4 and 8.5% by weight, preferably up to 8% by weight, of Al 2 O 3 . Similar to B 2 O 3, this component binds the alkali ions more firmly into the glass structure and has a positive effect on the resistance to crystallization. At lower contents, the tendency to crystallize would increase accordingly and, particularly at high B 2 O 3 contents, there would be an increased evaporation of alkali. Too high levels would disadvantageously result in an increase in the processing and melting temperature.
- the glasses contain 4-9.5% by weight, preferably 4.5-9% by weight Na 2 O. They can contain up to 5% by weight K 2 O and up to 2% by weight, preferably up to contain 1.5% by weight of Li 2 O.
- the sum of the alkali oxides is between 5 and 11% by weight, preferably between 5.5 and 10.5% by weight, particularly preferably between 7.5 and ⁇ 10.5% by weight.
- the alkali oxides lower the processing temperature of the glasses and are largely responsible for the adjustment of the thermal expansion. Above the respective upper limits, the glasses would have too high coefficients of thermal expansion. In addition, too high a proportion of the components would impair the hydrolytic resistance. It is also recommended for reasons of cost to limit the use of K 2 O and Li 2 O to the specified maximum levels.
- the glass can contain the divalent oxides MgO with 0-2% by weight, preferably 0-1% by weight, and CaO with 0-2.5% by weight, preferably 0-2% by weight 0 - ⁇ 2 wt .-%, included.
- the sum of these two components is between 0 and 3% by weight, preferably between 0 and ⁇ 3% by weight.
- the two components vary the "length of the glass", that is to say the temperature range in which the glass can be processed. Due to the different degree of network-changing effect of these components, the viscosity behavior can be adapted to the requirements of the respective production and processing method by exchanging these oxides for one another.
- CaO and MgO lower the processing temperature and are firmly bound in the glass structure. Surprisingly, it has been shown that the restriction to low CaO contents reduces the evaporation of volatile sodium and potassium borate compounds during hot molding. This is of particular importance with Al 2 O 3 contents, while with high Al 2 O 3 contents comparatively high CaO contents are tolerated. CaO improves acid resistance.
- the glass also applies to the ZnO component, which can be up to 1% by weight in the glass.
- the glass can contain up to 1.5% by weight of SrO and up to 1.5% by weight of BaO, which increases the resistance to devitrification. The sum of these two components is between 0 and 2% by weight.
- the glass is preferably free of SrO and BaO. For use as pharmaceutical primary packaging in particular, it is advantageous if the glass is BaO-free.
- the glass can contain coloring components, preferably Fe 2 O 3 , Cr 2 O 3 , CoO, each with up to 1% by weight, the sum of these components also not exceeding 1% by weight.
- the glass can also contain up to 3% by weight of TiO 2 . This component is preferably used when damage to a glass-metal fusion by UV radiation or the release of UV radiation is to be prevented in special fields of application of the glass.
- the glass can contain up to ⁇ 0.5% by weight of ZrO 2 , which results in an improvement in the alkali resistance.
- the ZrO 2 content is limited to this low maximum value, since the processing temperature would increase too much with higher proportions.
- the risk of glass defects increases with high ZrO 2 contents, since particles of the poorly soluble ZrO 2 raw material may remain unmelted and get into the product.
- the glass can contain up to 1% by weight of CeO 2 . In low concentrations CeO 2 acts as a refining agent, in higher concentrations it prevents the glass from becoming discolored by radioactive radiation. Meltings made with such a glass containing Ce0 2 can therefore be checked visually for possible damage such as cracks or corrosion of the lead wire even after radioactive exposure. Even higher Ce0 2 concentrations make the glass more expensive and lead to an undesirable yellow-brown color. For uses in which the ability to avoid discoloration due to radioactive radiation is not essential, a CeO 2 content between 0 and 0.3% by weight is preferred.
- the glass can contain up to 0.5% by weight of F " . This lowers the viscosity of the melt, which accelerates the refining.
- the glass can be refined with customary refining agents such as chlorides, for example NaCl, and / or sulfates, for example Na 2 SO 4 or BaSO 4 , in customary amounts, that is to say depending on The quantity and type of refining agent used can be found in the finished glass in quantities of 0.005 to 1% by weight. If As 2 0 3 , Sb 2 O 3 and BaS0 4 are not used, the glasses are As 2 O 3 -, Sb 2 O 3 - and BaO-free except for inevitable impurities, which is particularly advantageous for their use as pharmaceutical primary packaging.
- customary refining agents such as chlorides, for example NaCl, and / or sulfates, for example Na 2 SO 4 or BaSO 4
- the jars were made as follows: The raw materials were weighed and mixed thoroughly. The glass batch was melted at approx. 1600 ° C and then poured into steel molds.
- Table 1 are the respective composition (in wt .-% on an oxide basis), the thermal expansion coefficient ⁇ 20/3 oo [10 "6 / K], the transformation temperature T g [° C], the softening temperature Ew, the processing temperature V A [° C], which corresponds to the temperature at the viscosity 10 4 dPas, the temperature at the viscosity 10 3 dPas L3 [° C] and the difference L3 - V A [K], the density [g / cm 3 ] and the hydrolytic, acid and alkali resistance of the glasses.
- the chemical resistance was determined as follows:
- the hydrolytic resistance H according to DIN ISO 719.
- the base equivalent of the acid consumption is given in each case as ⁇ g Na 2 O / g glass powder.
- the maximum value for a chemically highly resistant glass of hydrolytic class 1 is 31 ⁇ g Na 2 O / g.
- the alkali resistance L according to DIN ISO 695.
- the weight loss is given in ⁇ g / dm 2 .
- the maximum erosion for a glass of lye class 1 (slightly soluble in lye) is 75 mg / dm 2 .
- the maximum removal for a glass of alkali class 2 (moderately soluble in caustic solution) is 175 mg / dm 2 .
- the glasses according to the invention are extremely suitable for all applications in which chemically highly resistant glasses are required, for. B. for laboratory applications, for chemical plants, for example as pipes.
- the glasses have a thermal expansion coefficient ⁇ 2 o / 3 oo between> 5.0 and 6.0 x 10 "6 / K, in a preferred embodiment of at least> 5.2 x 10 " 6 / K and in a particularly preferred embodiment between> 5.3 and 5.9 x 10 "6 / K, which can be varied, in particular, via the alkali content.
- the glasses are suitable for solder and melt-down glasses and as cladding glasses for glass fibers.
- compositions in% by weight on oxide basis
- nb not determined
- the glasses according to the invention have small temperature differences between L3, the temperature at the viscosity 10 3 dPas, and V A , the temperature at the viscosity 10 4 dPas, namely less than 250 K. This is advantageous for the further processing of thermoformed glass products, since the Alkaline evaporation is reduced. As thermogravimetric studies show, it is not only dependent on the processing temperature V A , but also on the further viscosity curve towards lower viscosities.
- Figure 1 shows the result of a thermogravimetric examination for 2 example glasses according to the invention (A3 and A4).
- the mass loss [%] is plotted against log (viscosity [dPas]).
- the glass samples show a slight loss of mass, which, like mass spectrometric studies or X-ray studies on condensation products from the melting process, can be attributed to the evaporation of alkali borates.
- the figure shows that a small temperature difference L3 - V A is desirable to minimize alkali evaporation.
- Time-dependent spectrometer measurements were carried out on some sample and comparison glasses.
- the spectrometer measurements are carried out on heated rotating cylindrical samples with a diameter of approx. 4 mm with a multi-channel spectrometer Zeiss MMS1. Stimulated by the supply of heat from a gas burner, the alkali ions emerging from the glass emit light of a specific wavelength, for example at approx. 589 nm (Na), 767 nm (K) and 670 nm (Li).
- the respective signals increase continuously with increasing test duration, which is approximately proportional to the energy input and which also means a correspondingly decreasing viscosity of the samples.
- Table 2 shows exemplary spectrometer data for glasses A8 - A12 and V1 - V2. For their compositions, reference is made to Table 1. All the numerical values listed in Table 2 represent mean values over 7 measurements on different samples from the same casting. The intensities of Examples A8, A9 and A11 are given in relation to the intensity values of V1. The intensities of A10 and A12 and V3 were compared to V2. I (Li) of A8 and A9 is not given because the reference value is missing because V1 is Li-free. I (Li) of A8 and A9 is considered in I (total) of A8 and A9.
- This formula is usually used for the calculation of indicators of surface resistance of ampoules and vials according to ISO 4802-2.
- the alkalis are determined by flame photometry and the result is given as the equivalent Na 2 0 (ppm).
- the factors therefore correspond to the ratios of the molar weights Na 2 O / K 2 O or Na 2 O / Li 2 O.
- I (total); Time 3.5 s calculated according to I (total) I (Na) + I (K) x 0.65 + I (Li) x 2.09
- the glasses according to the invention thus show a reduced alkali vaporization and are therefore outstandingly suitable for the production of pharmaceutical primary packaging materials, for example ampoules.
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10035801 | 2000-07-22 | ||
DE10035801A DE10035801B4 (en) | 2000-07-22 | 2000-07-22 | Borosilicate glass of high chemical resistance and its uses |
PCT/EP2001/008285 WO2002008134A1 (en) | 2000-07-22 | 2001-07-18 | Borosilicate glass with high chemical resistance and use thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1303461A1 true EP1303461A1 (en) | 2003-04-23 |
Family
ID=7649901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01956543A Withdrawn EP1303461A1 (en) | 2000-07-22 | 2001-07-18 | Borosilicate glass with high chemical resistance and use thereof |
Country Status (8)
Country | Link |
---|---|
US (1) | US6794323B2 (en) |
EP (1) | EP1303461A1 (en) |
JP (1) | JP5047443B2 (en) |
CN (1) | CN1203018C (en) |
AU (1) | AU2001278494A1 (en) |
CZ (1) | CZ20021046A3 (en) |
DE (1) | DE10035801B4 (en) |
WO (1) | WO2002008134A1 (en) |
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CN116920978B (en) * | 2023-07-10 | 2024-03-22 | 广东顺德中科优联医学检验有限公司 | Light-shielding antioxidant test tube for detecting catecholamine in serum and preparation method thereof |
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DE2413552B2 (en) * | 1974-03-21 | 1976-09-02 | Jenaer Glaswerk Schott & Gen., 6500 Mainz | FIRE-PROOF GLASS PANELS |
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DE2756555C3 (en) * | 1977-12-19 | 1982-12-02 | Schott Glaswerke, 6500 Mainz | Thermally toughenable glasses with high thermal shock resistance and thermal expansion coefficients in the temperature range from 20 to 300 ° C from 33.9 to 53.2 times 10 - 7 / ° C based on SiO 2 -B 2 O ; 3 -Al 2 O 3 -Na 2 O |
US4386164A (en) * | 1981-12-14 | 1983-05-31 | Owens-Illinois, Inc. | Barium-free Type I, Class B laboratory soda-alumina-borosilicate glass |
DE3310846A1 (en) * | 1983-03-25 | 1984-09-27 | Owens-Illinois, Inc., Toledo, Ohio | Barium-free laboratory glass of Type I Class B |
FR2558152B1 (en) * | 1984-01-13 | 1992-03-27 | Corning Glass Works | LOW DENSITY OPHTHALMIC LENSES, ABSORBING ULTRAVIOLET RADIATION AND HAVING HIGH TRANSMISSION INTO THE VISIBLE AND CORRECTIVE LENSES MADE OF SUCH LENSES |
DE3722130A1 (en) * | 1987-07-02 | 1989-01-12 | Schott Glaswerke | BOROSILICATE GLASS |
JPH0822762B2 (en) * | 1990-01-23 | 1996-03-06 | 東芝硝子株式会社 | UV transparent glass |
DD301821A7 (en) * | 1990-03-23 | 1994-04-07 | Jenaer Glaswerk Gmbh | ZIRKONHALTIGES BOROSILICATE GLASS |
JPH0474731A (en) * | 1990-07-06 | 1992-03-10 | Nippon Electric Glass Co Ltd | Borosilicate glass medical use |
DE4230607C1 (en) * | 1992-09-12 | 1994-01-05 | Schott Glaswerke | Chemically and thermally highly durable, can be fused with tungsten borosilicate glass and its use |
DE4430710C1 (en) * | 1994-08-30 | 1996-05-02 | Jenaer Glaswerk Gmbh | Low boric acid borosilicate glass and its use |
JPH08267278A (en) * | 1995-03-30 | 1996-10-15 | Kobe Steel Ltd | Alkaline glass for welding material |
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DE19536708C1 (en) * | 1995-09-30 | 1996-10-31 | Jenaer Glaswerk Gmbh | Boro-silicate glass contg. zirconium and lithium oxide(s) |
DE19622550A1 (en) * | 1996-06-05 | 1997-12-11 | Schott Glaswerke | Glass containers, in particular for storing pharmaceutical or diagnostic solutions |
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DE19842942C2 (en) * | 1998-09-18 | 2001-05-23 | Schott Glas | High chemical resistance borosilicate glass and its use |
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2000
- 2000-07-22 DE DE10035801A patent/DE10035801B4/en not_active Expired - Fee Related
-
2001
- 2001-07-18 WO PCT/EP2001/008285 patent/WO2002008134A1/en active Application Filing
- 2001-07-18 EP EP01956543A patent/EP1303461A1/en not_active Withdrawn
- 2001-07-18 JP JP2002513835A patent/JP5047443B2/en not_active Expired - Fee Related
- 2001-07-18 AU AU2001278494A patent/AU2001278494A1/en not_active Abandoned
- 2001-07-18 US US10/088,618 patent/US6794323B2/en not_active Expired - Lifetime
- 2001-07-18 CN CNB018028411A patent/CN1203018C/en not_active Expired - Lifetime
- 2001-07-18 CZ CZ20021046A patent/CZ20021046A3/en unknown
Non-Patent Citations (1)
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See references of WO0208134A1 * |
Also Published As
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DE10035801A1 (en) | 2002-02-14 |
JP5047443B2 (en) | 2012-10-10 |
US6794323B2 (en) | 2004-09-21 |
CZ20021046A3 (en) | 2003-11-12 |
CN1392868A (en) | 2003-01-22 |
CN1203018C (en) | 2005-05-25 |
US20030087745A1 (en) | 2003-05-08 |
JP2004504258A (en) | 2004-02-12 |
WO2002008134A1 (en) | 2002-01-31 |
DE10035801B4 (en) | 2008-04-03 |
AU2001278494A1 (en) | 2002-02-05 |
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