Glass composition

Abstract

The present invention provides a glass composition, which contains the following components by weight: SiO2: 52-72%, B2O3: 3-17%, Al2O3: 0.5-8%, ZnO: 2-10%, Rn2O: 6-25%, Al2O3 / B2O3 is 0.1-1.0, and Rn2O is the total content of Li2O, Na2O, and K2O. Due to the rational component design, the glass composition obtained by the present invention has an excellent refractive index and Abbe number, and can be used for manufacturing automotive lamps.

Description

[Technical Field]

[0001] The present invention relates to a glass composition, and more particularly to a glass composition having excellent chemical stability and weather resistance. [Background technology]

[0002] Automotive lamp lenses shape the light emitted from the light source, increasing the illuminance within a range of 150 to 400 meters ahead of the vehicle and improving driving safety. Therefore, more and more lamp lenses are being installed in automotive lamps. In the prior art, lamp lenses are made of soda lime silica glass. Summary of the Invention [Problem to be solved by the invention]

[0003] With the increasing demand for longer service life for automotive lamps and the development of future smart lamps, soda-lime silica glass is no longer able to meet the development needs of lamp lenses. Although soda-lime silica glass can produce imaging-grade products, it has poor chemical stability, particularly poor water resistance and weather resistance. Under high temperature and humidity conditions, corrosion spots are likely to appear on the lens surface within a short period of time, which not only reduces the illuminance of automotive lamps and compromises safety, but also fails to meet the imaging requirements of future automotive lamps.

[0004] The technical problem to be solved by the present invention is to provide a glass composition having excellent chemical stability and weather resistance. [Means for solving the problem]

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows: (1) A glass composition containing the following components in weight percent: SiO2: 52-72%, B2O3: 3-17%, Al2O3: 0.5-8%, ZnO: 2-10%, Rn2O: 6-25%, where Al2O3 / B2O3 is 0.1-1.0, and Rn2O is the total content of Li2O, Na2O, and K2O.

[0006] (2) The glass composition according to (1), further comprising the following components in weight percent: RO: 0-15%, and / or TiO2: 0-5%, and / or P2O5: 0-2%, and / or ZrO2: 0-3%, and / or La2O3: 0-5%, and / or Y2O3: 0-8%, and / or a fining agent: 0-1%, where RO is the total content of MgO, CaO, SrO, and BaO, and the fining agent is one or more of Sb2O3, SnO2, Na2SiF6, and K2SiF6.

[0007] (3) SiO 2 、 The glass composition contains B2O3, Al2O3, ZnO, and an alkali metal oxide, and Al2O3 / B2O3 is 0.1 to 1.0, and the water resistance stability D W is class 2 or higher, refractive index n d is 1.50~1.56, Abbe number ν d is 56-65.

[0008] (4) The glass composition according to (3), comprising the following components in weight percent: SiO2: 52-72%, and / or B2O3: 3-17%, and / or Al2O3: 0.5-8%, and / or ZnO: 2-10%, and / or TiO2: 0-5%, and / or Rn2O: 6-25%, and / or RO: 0-15%, and / or P2O5: 0-2%, and / or ZrO2: 0-3%, and / or La2O3: 0-5%, and / or Y2O3: 0-8%, and / or a fining agent: 0-1%, wherein RO is the total content of MgO, CaO, SrO, and BaO, Rn2O is the total content of Li2O, Na2O, and K2O, and the fining agent is one or more of Sb2O3, SnO2, Na2SiF6, and K2SiF6.

[0009] (5) The glass composition according to any one of (1) to (4), comprising the following components in weight percent: Al2O3 / SiO2 is 0.01 to 0.1, preferably Al2O3 / SiO2 is 0.02 to 0.08, more preferably Al2O3 / SiO2 is 0.03 to 0.07, and / or Al2O3 / B2O3 is 0.15 to 0.8, preferably Al2O3 / B2O3 is 0.15 to 0.6 and / or ZnO / SiO2 is 0.03 to 0.17, preferably ZnO / SiO2 is 0.04 to 0.15, more preferably ZnO / SiO2 is 0.06 to 0.12, and / or (ZnO+TiO2) / B2O3 is 0.2 to 2.0, preferably (ZnO+TiO2) / B2O3 is 0.3 to 1.5, more preferably (ZnO+TiO2) / B2O3 is 0.35 to 1.0.

[0010] (6) A glass composition according to any one of (1) to (5), comprising the following components in weight percent: SiO2: 55 to 70%, preferably SiO2: 56 to 68%, and / or B2O3: 5 to 15%, preferably B2O3: 7 to 13%, and / or Al2O3: 1 to 6%, preferably Al2O3: 1 to 5%, and / or ZnO: 3 to 9%, preferably ZnO: 4 to 8%, and / or TiO2: 0.05 to 4%, preferably TiO2: 0.2 to 3%, and / or Rn2O: 7 to 20%, preferably Rn2O: 8 to 18%, and / or RO: 0 to 12%, preferably or RO: 0-10%, and / or P2O5: 0-1%, and / or ZrO2: 0-2%, preferably ZrO2: 0-1%, and / or La2O3: 0-3%, and / or Y2O3: 0-5%, preferably Y2O3: 0-3%, and / or fining agent: 0-0.8%, preferably fining agent: 0-0.5%, wherein RO is the total content of MgO, CaO, SrO, and BaO, Rn2O is the total content of Li2O, Na2O, and K2O, and the fining agent is one or more of Sb2O3, SnO2, Na2SiF6, and K2SiF6.

[0011] (7) The glass composition according to any one of (1) to (6), containing the following components in weight percent: Li2O: 0.1 to 5%, preferably Li2O: 0.2 to 3%, more preferably Li2O: 0.5 to 2%, and / or Na2O: 5 to 15%, preferably Na2O: 6 to 14%, more preferably Na2O: 7 to 13%, and / or K2O: 0 to 8%, preferably K2O: 0 to 7%, more preferably K2O: 0 to 5%.

[0012] (8) The glass composition according to any one of (1) to (7), comprising the following components in weight percent: K2O / (Na2O+Li2O) is 0.8 or less, preferably K2O / (Na2O+Li2O) is 0.05 to 0.5, more preferably K2O / (Na2O+Li2O) is 0.1 to 0.3, and / or Li2O / Na2O is 0.01 to 0.3, preferably Li2O / Na2O is 0.02 to 0.25, more preferably Li2O / Na2O is 0.03 to 0.22, and / or K2O / Na2O is 0.01 to 0.8, preferably K2O / Na2O is 0.05 to 0.5, more preferably K2O / Na2O is 0.1 to 0.4.

[0013] (9) The glass composition according to any one of (1) to (8), containing the following components in weight percent: CaO: 10% or less, and / or BaO: 10% or less. (10) The glass composition according to any one of (1) to (9), containing the following components in weight percent: CaO: 5% or less, and / or BaO: 5% or less.

[0014] (11) The N element content in the glass raw material is less than 2.0%, preferably less than 1.5%, more preferably less than 1.0%, and the N element content is less than 100 kg The theoretical amount of N element introduced to melt the glass / 100 kg The glass composition according to any one of (1) to (10), wherein the glass weight is 100%.

[0015] (12) Refractive index n d is 1.50 to 1.56, preferably 1.505 to 1.55, more preferably 1.51 to 1.54, and Abbe number ν dThe glass composition according to any one of (1) to (11), wherein the value of the saturation constant is 56 to 65, preferably 57 to 63, and more preferably 57.5 to 62.

[0016] (13) Acid resistance stability D A is Class 2 or more, preferably Class 1, and / or water resistance stability D W is class 2 or more, preferably class 1, and / or the thermal expansion coefficient α 20 / 300℃ is 85 x 10 -7 / K or less, preferably 82 × 10 -7 / K or less, preferably 80×10 -7 / K or less, and / or the transition temperature T g is 580°C or less, preferably 570°C or less, more preferably 560°C or less, and / or the density ρ is 2.70 g / cm 3 or less, preferably 2.65 g / cm 3 or less, more preferably 2.60 g / cm 3 and / or light transmittance τ 400nm and / or the increase in turbidity after a 200-hour weather resistance test is 2.0% or less, preferably 1.0% or less, more preferably 0.8% or less, even more preferably 0.5% or less, and / or the foaming degree is Class A or higher, preferably Class A0 or higher, even more preferably Class A. 00 The glass composition according to any one of (1) to (12), wherein the grade and / or stripes are C grade or higher, preferably B grade or higher, and / or the high temperature viscosity at 1400°C is 220 dPaS or lower, preferably 180 dPaS or lower, more preferably 150 dPaS or lower.

[0017] (14) A glass preform produced using the glass composition according to any one of (1) to (13). (15) An optical element produced from the glass composition according to any one of (1) to (13) or the glass preform according to (14). (16) An optical instrument comprising the glass composition according to any one of (1) to (13) and / or the optical element according to (15). [Effects of the Invention]

[0018] The beneficial effects of the present invention are as follows: Due to the rational component design, the glass composition obtained by the present invention has excellent chemical stability and weather resistance, and can be used to manufacture lenses for automobile lamps. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the glass composition according to the present invention will be described in detail, but the present invention is not limited to the embodiments described below and can be practiced by appropriately modifying them within the scope of the object of the present invention. Furthermore, although some omissions may be made, the gist of the present invention is not limited by repetition of the description. In the following description, the glass composition of the present invention may also be simply referred to as glass.

[0020] [Glass composition] The range of each component (constituent element) of the glass composition of the present invention will be explained below. In this specification, the content and total content of each component will be expressed in weight percent (wt%) unless otherwise specified. That is, the content and total content of each component will be expressed as weight percent relative to the total weight of the glass material converted into an oxide composition. Here, "converted into an oxide composition" means that the total weight of the oxide material when the oxides, complex salts, hydroxides, etc. used as raw materials for the glass composition of the present invention are decomposed and converted into oxides during melting is taken as 100%.

[0021] Specifically, the numerical ranges set forth herein include upper and lower limits, and the terms "greater than or equal to" and "less than or equal to" include the endpoints, and all integers and fractions subsumed within the range, but are not limited to the specific values ​​set forth when the range is limited. References herein to "and / or" are inclusive, e.g., "A and / or B" means A only, B only, or both A and B.

[0022] <Required and optional ingredients> SiO2 is the main component of glass. If its content exceeds 72%, it is difficult to melt the glass, and bubbles, inclusions, and stripes cannot be removed, making it difficult to obtain imaging-grade products. Furthermore, the refractive index of the glass will be lower than the design requirements. If the refractive index of the glass is too low, a lamp lens will require a larger curvature for the same beam divergence angle, which increases the difficulty of hot processing, leads to larger optical errors, and is more likely to produce defects during the hot processing process, accelerating the occurrence of corrosion spots on the lens surface. If the SiO2 content is less than 52%, the chemical stability (especially water resistance) and weather resistance of the glass will be difficult to meet the design requirements. Meanwhile, the Abbe number of the glass will be lower than the design requirements. Because automotive lamps are single-lens optical systems, if the Abbe number of the glass is too low and the dispersion is too large, a purple edge will appear after the beam passes through the glass lens, severely affecting lighting quality. Therefore, the SiO2 content should be 52-72%, preferably 55-70%, and more preferably 56-68%.

[0023] Adding an appropriate amount of B2O3 can lower the melting temperature and high-temperature viscosity of glass. In borosilicate glass, the lower the high-temperature viscosity, the easier it is to remove bubbles, inclusions, and stripes from the glass. More importantly, an appropriate amount of B2O3 can further reinforce the glass network and improve the weather resistance of the glass. However, if the B2O3 content is less than 3%, this effect is not significant. If the B2O3 content exceeds 17%, the water resistance of the glass rapidly deteriorates. Therefore, the B2O3 content should be limited to 3-17%, preferably 5-15%, and more preferably 7-13%.

[0024] An appropriate amount of Al2O3 can reinforce the glass network, improve the chemical stability of the glass, and reduce the thermal expansion coefficient of the glass. However, if the content is less than 0.5%, these effects are not significant. If the Al2O3 content exceeds 8%, the high-temperature viscosity of the glass increases rapidly, making it difficult to meet the design requirements. Therefore, the Al2O3 content range is 0.5-8%, preferably 1-6%, and more preferably 1-5%.

[0025] In some embodiments, the relative contents of Al2O3 and SiO2 have a significant effect on the weather resistance of the glass. If the Al2O3 / SiO2 value is less than 0.01, the weather resistance of the glass decreases, making it difficult to meet design requirements. If the Al2O3 / SiO2 value is greater than 0.1, the weather resistance of the glass does not improve significantly, but the high-temperature viscosity increases rapidly. Therefore, the Al2O3 / SiO2 value is preferably 0.01 to 0.1, more preferably 0.02 to 0.08, and even more preferably 0.03 to 0.07.

[0026] In some embodiments, the relative contents of Al2O3 and B2O3 have a significant effect on the water resistance of the glass. If the Al2O3 / B2O3 ratio is less than 0.1, the water resistance of the glass decreases, making it difficult to meet design requirements. If the Al2O3 / B2O3 ratio is greater than 1.0, the water resistance of the glass does not improve significantly, but the high-temperature viscosity increases rapidly. Therefore, the Al2O3 / B2O3 ratio is preferably 0.1 to 1.0, more preferably 0.15 to 0.8, and even more preferably 0.15 to 0.6.

[0027] A small amount of P2O5 in glass can significantly improve the chemical strengthening performance of the glass, while P2O5 promotes the formation of glass crystallites in the glass, improving the thermal shock resistance of the glass. If the P2O5 content exceeds 2%, the glass may become unstable and devitrify. Therefore, the P2O5 content is controlled to 2% or less, preferably 1% or less. If the glass has sufficient chemical strengthening performance and thermal shock resistance, it is more preferable to not contain P2O5.

[0028] An appropriate amount of ZnO significantly improves the refractive index of glass and reduces the thermal expansion coefficient and transition temperature of glass. However, if the ZnO content is less than 2%, these effects are not significant. If the ZnO content exceeds 10%, the Abbe number of the glass decreases, the surface tension during melting increases, making it difficult to remove bubbles, and the bubble quality does not meet the design requirements. Therefore, the ZnO content is 2 to 10%, preferably 3 to 9%, and more preferably 4 to 8%.

[0029] Through extensive experimental research, the inventors have found that, in some embodiments, ZnO modifies the SiO2-based network structure in glass, and its relative content is related to the probability of microcracks on the glass surface. Microcracks occur during hot or cold processing, significantly reducing the thermal shock resistance of the glass. Microcracks can also significantly reduce the acid resistance, water resistance, and weather erosion resistance of the glass. For example, in automobile lamp lenses, water vapor corrodes the glass from the microcracks, causing defects on the glass surface. High and low temperature weather and water vapor corrosion then expand the microcracks, causing weathering and rapidly expanding defects on the surface of the glass component. When the ratio of ZnO to SiO2, ZnO / SiO2, is less than 0.03, the effect of inhibiting microcracks is not significant. When the ZnO / SiO2 ratio exceeds 0.17, the surface tension of the glass liquid increases, leading to the generation and accumulation of a large number of bubbles during melting, resulting in a poor match between the refractive index and Abbe number, and even leading to production stoppages and significant losses. Therefore, the value of ZnO / SiO2 is preferably 0.03 to 0.17, more preferably 0.04 to 0.15, and even more preferably 0.06 to 0.12.

[0030] BaO, SrO, CaO, and MgO are alkaline earth metal oxides. An appropriate amount of alkaline earth metal oxides in glass can increase the refractive index and enhance the stability of the glass. However, if the total content (RO) exceeds 15%, the alkaline earth metal oxides are prone to precipitation under conditions of water vapor and temperature changes, forming opaque salts on the glass surface and impairing imaging performance. Furthermore, alkaline earth metal oxides exceeding 15% significantly reduce the acid resistance of the glass, resulting in rapid corrosion spots on the lamp lens surface due to corrosion caused by acid rain, acidic snow-melting agents, etc. Therefore, the total content (RO) of BaO, SrO, CaO, and MgO should be 15% or less, preferably 12% or less, and more preferably 10% or less.

[0031] After extensive experimental research, the inventors have found that the order of precipitation ability is BaO > SrO > CaO > MgO. From the perspective of precipitation control, MgO and CaO are preferably used, SrO is more preferably used, and BaO is even more preferably used. Furthermore, small amounts of CaO and BaO, especially BaO, can significantly improve the cellularity of glass, so small amounts of CaO or BaO can be added to the glass to improve cellularity. As mentioned above, if the glass design is focused on further reducing the high-temperature viscosity and further increasing the refractive index, up to 10% CaO and / or up to 10% BaO can be added. If the glass design is focused on precipitation control, up to 5% CaO and / or up to 5% BaO can be added.

[0032] Although TiO2 can increase the refractive index, water resistance, and weather resistance of glass, if its content exceeds 5%, the transmittance of the glass, especially in the near-ultraviolet-violet band, drops rapidly, reducing the illuminance of the lamp lens and affecting driving safety. Furthermore, the temperature of the lamp lens rises rapidly during use, accelerating erosion of the lens surface, accelerating the development and expansion of microcracks, and accelerating lens fogging. Therefore, the TiO2 content should be 0-5%, preferably 0.05-4%, and more preferably 0.2-3%.

[0033] In some embodiments, ZnO and TiO2 change the structure of B2O3 in the glass, significantly changing the glass's high-temperature viscosity, transition temperature, and water resistance. When the (ZnO + TiO2) / B2O3 ratio is less than 0.2, the glass's water resistance rapidly decreases and its transition temperature increases, but the decrease in the glass's high-temperature viscosity is insignificant. When the (ZnO + TiO2) / B2O3 ratio is greater than 2.0, the glass's high-temperature viscosity rapidly increases and the improvement in the glass's water resistance is insignificant. In addition, the glass's UV and 400nm transmittance is significantly reduced, which, when used in a lamp, can cause a rapid increase in heat generation and accelerate the occurrence of defects on the glass surface. Therefore, when (ZnO+TiO2) / B2O3 is preferably 0.2 to 2.0, more preferably 0.3 to 1.5, and even more preferably 0.35 to 1.0, the high-temperature viscosity, transition temperature, and water resistance of the glass are best balanced.

[0034] A ZrO2 content of less than 3% in glass reduces the corrosion ability of the glass liquid on the furnace body, thereby extending the service life of the melting furnace. If the ZrO2 content exceeds 3%, insoluble matter is more likely to form in the glass, resulting in a deterioration in the inherent quality of the glass. Therefore, the ZrO2 content is 3% or less, preferably 2% or less, and more preferably 1% or less.

[0035] Although La2O3 can increase the refractive index of glass and reduce the high-temperature viscosity of glass, if its content exceeds 5%, the acid resistance of the glass rapidly decreases and the cost increases. Therefore, the La2O3 content is limited to 5% or less, preferably 3% or less, and more preferably, La2O3 is not present.

[0036] Although Y2O3 can increase the refractive index and thermal shock resistance of glass, its content exceeding 8% rapidly reduces the chemical stability of the glass. Therefore, the Y2O3 content is limited to 8% or less, preferably 5% or less, and more preferably 3% or less.

[0037] The alkali metal oxides Li2O, Na2O, and K2O can lower the glass transition temperature and improve the melting properties of the glass, but if their total content Rn2O exceeds 25%, the chemical stability of the glass decreases. Therefore, the Rn2O content is 6 to 25%, preferably 7 to 20%, and more preferably 8 to 18%.

[0038] Among the effects of the individual alkali metal oxides, Li2O has the strongest ability to lower the glass transition temperature and high-temperature viscosity. If its content is less than 0.1%, this effect is not significant. If its content exceeds 5%, the glass is prone to devitrification, raw material costs rise rapidly, and more seriously, the glass melts too quickly, making it unsuitable for production using a high-efficiency cold-top electric furnace, resulting in a rapid increase in production costs and energy consumption. Therefore, the Li2O content should be 0.1-5%, preferably 0.2-3%, and more preferably 0.5-2%.

[0039] An appropriate amount of Na2O can improve the melting properties of glass and reduce its high-temperature viscosity. However, if the Na2O content is less than 5%, the melting properties and high-temperature viscosity of the glass will not meet the design requirements, and the water resistance and weather resistance of the glass will rapidly deteriorate. Furthermore, if the Na2O content exceeds 15%, the thermal expansion coefficient of the glass will rapidly increase, and the water resistance and weather resistance of the glass will rapidly deteriorate, making it difficult to meet the design requirements. Therefore, the Na2O content is limited to 5-15%, preferably 6-14%, and more preferably 7-13%.

[0040] If the K2O content exceeds 8%, the glass network structure will be severely destroyed, making it difficult for the water resistance and weather resistance of the glass to meet the design requirements. Therefore, the K2O content is limited to 8% or less, preferably 7% or less, and more preferably 5% or less.

[0041] The inventors' research has revealed that the presence of a mixture of three alkali metal oxides, Li2O, Na2O, and K2O, results in more complex changes in the glass structure than when a single alkali metal oxide is present, resulting in complex changes in the glass's water resistance, weather resistance, thermal shock resistance, and high-temperature viscosity. Specifically, when the K2O / (Na2O + Li2O) ratio is greater than 0.8, the glass's chemical stability and weather resistance rapidly deteriorate, and its thermal expansion coefficient rapidly increases. Therefore, the K2O / (Na2O + Li2O) ratio is preferably 0.8 or less, more preferably 0.05 to 0.5, and even more preferably 0.1 to 0.3.

[0042] In some embodiments, if the ratio of the Li2O content to the Na2O content, Li2O / Na2O, is less than 0.01, the high-temperature viscosity of the glass increases, and the thermal shock resistance of the glass decreases. If the Li2O / Na2O value exceeds 0.3, the glass takes longer to cool from the liquid state to the solid state during the production process, resulting in poor striping and making it very difficult to control the tolerances of the blanks required for press-molding lamp lenses, resulting in poor material utilization and a low yield. Therefore, the Li2O / Na2O value is preferably 0.01 to 0.3, more preferably 0.02 to 0.25, and even more preferably 0.03 to 0.22.

[0043] In some embodiments, when the ratio of the content of K2O to the content of Na2O, K2O / Na2O, is greater than 0.8, the K2O content of the glass structure is + If the K2O / Na2O value is less than 0.01, the "mixed alkali" effect of the glass will be very weak, and the K + Na + Therefore, the K2O / Na2O ratio is preferably 0.01 to 0.8, more preferably 0.05 to 0.5, and even more preferably 0.1 to 0.4.

[0044] Sb2O3, SnO2, Na2SiF6, and K2SiF6, etc., can be used as fining agents and are advantageous in increasing the cellularity of the glass, and when present alone or in combination, the content is 1% or less, preferably 0.8% or less, more preferably 0.5% or less.

[0045] In addition to optimizing the melting properties of glass and improving the porosity of glass through component design, similar high-viscosity silicate glasses usually optimize the melting properties and porosity of glass by adding oxide components and nitrates. Nitrates convert most of the nitrogen element into NO during the melting process. X Emitted into the atmosphere as a gas, nitrogen oxides cause significant damage to human health, and long-term inhalation poses the risk of causing lung cancer. Therefore, the present inventors have been conducting research to ensure the melting performance of glass while simultaneously reducing nitrogen oxide emissions. As a result of their research, the present inventors have found that by introducing nitrates using methods such as KNO3 and Ba(NO3)2 and mixing them with the above-mentioned fining agents, the glass can meet the required bubble content and at the same time reduce nitrogen oxide emissions to a lower level. By conversion, the N (nitrogen) element content in the glass raw materials (based on a theoretical glass of 100 kg Amount of N element introduced when melting / 100 kg (glass weight x 100%) is less than 2.0%, preferably less than 1.5%, and more preferably less than 1.0%.

[0046] <Ingredients that should not be included> In the glass of the present invention, oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo, even when contained alone or in combination in small amounts, color the glass, cause absorption at specific wavelengths in the visible region, and further weaken the effect of improving the visible light transmittance of the present invention. Therefore, it is preferable that they are not actually contained in glass compositions that require transmittance at wavelengths in the visible region, in particular.

[0047] In recent years, there has been a trend toward restricting the use of oxides of Th, Cd, Tl, Os, Be, and Se as harmful chemicals, and environmental protection efforts are required not only in the glass manufacturing process but also in the processing and disposal of finished products. Therefore, when environmental impact is a priority, it is preferable to avoid these elements except for unavoidable contamination. This ensures that the glass composition does not actually contain substances that pollute the environment. Therefore, the glass composition of the present invention can be manufactured, processed, and disposed of without special environmental measures. Furthermore, for environmental protection, it is preferable that the glass composition of the present invention does not contain As2O3 and PbO.

[0048] The terms "free" and "0%" used herein mean that no compounds, molecules, or elements were intentionally added as raw materials for the glass composition of the present invention. However, impurities or components that were not intentionally added as raw materials and / or equipment for producing the glass composition may exist in small or trace amounts in the final glass composition, and these are also within the scope of the patent of the present invention.

[0049] The performance of the glass composition of the present invention will be explained below. <Refractive index and Abbe number> The refractive index of glass (n d ) and Abbe number (ν d ) has been tested in accordance with the method specified in "GB / T7962.1-2010". In some embodiments, the refractive index (n d ) is 1.56, preferably 1.55, and more preferably 1.54. In some embodiments, the refractive index (n d ) is 1.50, preferably 1.505, and more preferably 1.51. In some embodiments, the Abbe number (ν d ) is 65, preferably 63, and more preferably 62. In some embodiments, the Abbe number (ν d) is 56, preferably 57, and more preferably 57.5.

[0050] <Acid resistance stability>

[0051] Acid resistance stability of glass (D A ) (powder method) is tested in accordance with the method specified in "GB / T17129". In some embodiments, the acid stability (D A ) is class 2 or more, preferably class 1.

[0052] <Water resistance stability> Water resistance stability of glass (D w ) (powder method) is tested in accordance with the method specified in "GB / T17129". In some embodiments, the water resistance stability (D w ) is class 2 or more, preferably class 1.

[0053] <Thermal expansion coefficient> The thermal expansion coefficient of glass (α 20 / 300℃ ) is data measured at 20 to 300°C according to the method specified in "GB / T7962.16-2010". In some embodiments, the coefficient of thermal expansion (α 20 / 300℃ ) is 85 x 10 -7 / K or less, preferably 82 × 10 -7 / K or less, preferably 80×10 -7 / K or less.

[0054] <density> The density (ρ) of the glass is tested according to the method specified in "GB / T7962.20-2010". In some embodiments, the density (ρ) of the glass composition of the present invention is 2.70 g / cm 3 or less, preferably 2.65 g / cm 3 or less, more preferably 2.60 g / cm 3 The following is the result.

[0055] <Transition temperature> Glass transition temperature (T g ) has been tested in accordance with the method specified in "GB / T7962.16-2010". In some embodiments, the transition temperature (T g ) is 580°C or less, preferably 570°C or less, and more preferably 560°C or less.

[0056] <Light transmittance> Light transmittance of glass (τ 400nm ) has been tested in accordance with the method specified in "GB / T7962.12-2010". In some embodiments, the optical transmittance (τ 400nm ) is 98.0% or more, preferably 98.5% or more, more preferably 99.0% or more, and even more preferably 99.2% or more.

[0057] <Bubble content> The bubble content of the glass is tested according to the method specified in "GB / T7962.8-2010". In some embodiments, the cellularity of the glass composition of the present invention is Class A or higher, preferably Class A0 or higher, more preferably Class A 00 It is a grade.

[0058] <Weather resistance> The weather resistance of glass is tested according to the following method. The sample is placed in a test box with a saturated water vapor atmosphere at a relative humidity of 90%, and the temperature is alternately circulated at 40 to 50°C every hour, and the increase in turbidity is measured.

[0059] In some embodiments, the glass composition of the present invention exhibits a turbidity increase of 2.0% or less, preferably 1.0% or less, more preferably 0.8% or less, and even more preferably 0.5% or less after 200 hours of weathering.

[0060] <Stripe> Glass stripes are checked by comparing a standard sample with a stripe meter consisting of a point light source and a lens from the direction where the stripes are most visible. The grades are divided into four levels. See Table 1 below for details.

[0061] [Table 1]

[0062] In some embodiments, the stripes of the glass compositions of the present invention are Class C or better, preferably Class B or better.

[0063] <High temperature viscosity> The high temperature viscosity of glass at 1400°C is tested according to the following method: The test is performed using a THETA Rheotronic II high temperature viscometer with the rotational method, and the numerical unit is dPaS (poise), with a smaller value indicating a lower viscosity. In some embodiments, the glass composition of the present invention has a high temperature viscosity at 1400° C. of 220 dPaS or less, preferably 180 dPaS or less, and more preferably 150 dPaS or less.

[0064] [Manufacturing method] The method for producing the glass composition of the present invention is as follows. The glass of the present invention is produced using conventional raw materials, such as oxides, hydroxides, fluorides, and various salts (carbonates, nitrates, sulfates, phosphates, and metaphosphates), by conventional processes. After blending them in a conventional manner, the prepared furnace material is placed in a melting furnace (platinum crucible, gold or platinum alloy crucible) at 1400 to 1550°C and melted. The mixture is then clarified and homogenized to obtain a homogeneous molten glass free of bubbles and unmelted material. This molten glass is then cast into a mold and annealed. Those skilled in the art will be able to appropriately select the raw materials, production method, and process parameters according to actual needs.

[0065] [Glass preforms and optical elements] A glass preform can be produced from the produced glass composition using a press molding method such as direct drop molding, polishing, or hot press molding. That is, a molten glass composition can be directly molded into a precision glass preform using a precision drop molding method, or a glass preform can be produced using a mechanical processing method such as grinding or polishing, or a preform for press molding can be produced using the glass composition, and the preform can be hot press molded and then polished to produce a glass preform. It should be noted that the method for producing an optical preform is not limited to the above methods.

[0066] As described above, the glass composition of the present invention is useful for various optical elements and optical designs, and it is particularly preferred to prepare a blank using the glass composition of the present invention, and then subject this blank to hot press molding, precision press molding, or the like to produce optical elements such as lenses and prisms.

[0067] The glass preform and optical element of the present invention are formed from the glass composition of the present invention. The glass preform of the present invention has the excellent properties of the glass composition, and the optical element of the present invention has the excellent properties of the glass composition, making it possible to provide optical elements such as various lenses and prisms with high optical value.

[0068] Examples of lenses include various lenses with spherical or aspherical lens surfaces, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. The lenses of the present invention also include lenses for automobile lamps.

[0069] [Optical equipment] Optical elements comprising the glass compositions of the present invention can be used to fabricate optical instruments, including, but not limited to, photographic devices, imaging devices, projection devices, display devices, in-vehicle devices (including lamps), and surveillance devices. [Example]

[0070] <Examples of Glass Compositions> To further clearly illustrate the technical solutions of the present invention, the following non-limiting examples are provided. In the present examples, the above-described glass composition manufacturing method was used to obtain glass compositions having the compositions shown in Tables 2 and 3. The properties of each glass were measured by the test methods described in the present invention, and the results are shown in Tables 2 and 3.

[0071] [Table 2]

[0072] [Table 3]

[0073] <Example of glass preform> The glasses obtained in Examples 1 to 17 of the glass compositions are subjected to polishing or press molding such as hot press molding or precision press molding to produce preforms of various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.

[0074] <Example of optical element> The preform obtained in the above optical preform example is tempered to fine-tune the refractive index while reducing strain inside the glass so that the optical properties such as the refractive index reach the desired values. Each preform is then ground and polished to produce various lenses and prisms, including concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.Anti-reflection coatings can also be applied to the surfaces of the resulting optical elements.

[0075] <Example of optical equipment> The optical elements manufactured according to the above optical element embodiments can be used in imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / illumination in the automotive field, photolithography technology, excimer lasers, wafers, computer chips and integrated circuits and electronic devices containing such circuits and chips, or imaging equipment and devices in the automotive field by using one or more optical elements according to optical design to form optical parts or components.

Claims

1. A glass composition comprising the following components in weight percent and satisfying the following conditions: SiO 2 : 52 - 72%, B 2 O 3 : 3 - 17%, Al 2 O 3 : 0.5 - 8%, ZnO: 2 - 10%, and Rn 2 O: 6 - 25%. Al 2 O 3 / B 2 O 3 (weight ratio) is 0.1 to 1.0, ZnO / SiO 2 (weight ratio) is 0.03 to 0.12, and Li 2 O / Na 2 O (weight ratio) is 0.02 to 0.

3. Rn 2 The amount of O is Li 2 O, Na 2 O and K 2 The total O content.

2. 10. The glass composition of claim 1, further comprising one or more components selected from the following group in weight percent: RO: 0-15%, TiO 2 : 0-5%, P 2 O 5 : 0-2%, ZrO 2 : 0-3%, La 2 O 3 : 0-5%, Y 2 O 3 : 0-8%, and clarifier: 0-1%. The amount of RO is the total content of MgO, CaO, SrO, and BaO, and the fining agent is Sb 2 O 3 , SnO 2 , Na 2 SiF 6 , and K 2 SiF 6 It is one or more of the following.

3. SiO 2 , B 2 O 3 , Al 2 O 3 , ZnO, and alkali metal oxides, Al 2 O 3 / B 2 O 3 (weight ratio) is 0.1 to 1.0, ZnO / SiO 2 (weight ratio) is 0.03 to 0.12, Li 2 O / Na 2 O (weight ratio) is 0.02 to 0.3, and water resistance stability D W is class 2 or higher, refractive index n d is 1.50 to 1.56, Abbe number ν d is 56 to 65.

4. 4. The glass composition of claim 3, comprising one or more components selected from the following group in weight percent: SiO 2 : 52-72%, B 2 O 3 : 3-17%, Al 2 O 3 : 0.5~8%, ZnO: 2~10%, TiO 2 : 0-5%, Rn 2 O: 6-25%, RO: 0-15%, P 2 O 5 : 0-2%, ZrO 2 : 0-3%, La 2 O 3 : 0-5%, Y 2 O 3 : 0-8%, and clarifier: 0-1%. The amount of RO is the total content of MgO, CaO, SrO, and BaO, and Rn 2 The amount of O is Li 2 O, Na 2 O and K 2 The total content of O is Sb 2 O 3 , SnO 2 , Na 2 SiF 6 , and K 2 SiF 6 It is one or more of the following.

5. 5. The glass composition according to claim 1, which satisfies one or more of the following three conditions: 1) Al 2 O 3 / SiO 2 (weight ratio) is 0.01 to 0.1; 2) Al 2 O 3 / B 2 O 3 (weight ratio) is 0.15 to 0.8; 3) (ZnO + TiO 2 ) / B 2 O 3 (weight ratio) is 0.2 to 2.

0.

6. 5. The glass composition according to claim 1, which satisfies one or more of the following four conditions: 1) Al 2 O 3 / SiO 2 (weight ratio) is 0.02 to 0.08; 2) Al 2 O 3 / B 2 O 3 (weight ratio) is 0.15 to 0.6; 3) ZnO / SiO 2 (weight ratio) is 0.04 to 0.12; 4) (ZnO + TiO 2 ) / B 2 O 3 (weight ratio) is 0.3 to 1.

5.

7. 5. The glass composition according to claim 1, which satisfies one or more of the following three conditions: 1) Al 2 O 3 / SiO 2 (weight ratio) is 0.03 to 0.07; 2) ZnO / SiO 2 (weight ratio) is 0.06 to 0.12; 3) (ZnO + TiO 2 ) / B 2 O 3 (weight ratio) is 0.35 to 1.

0.

8. 5. The glass composition according to claim 1, comprising one or more components selected from the following group in weight percent: SiO 2 : 55-70, B 2 O 3 : 5-15%, Al 2 O 3 : 1~6%, ZnO: 3~9%, TiO 2 : 0.05 to 4%, Rn 2 O: 7-20%, RO: 0-12%, P 2 O 5 : 0-1%, ZrO 2 : 0-2%, is La 2 O 3 : 0-3%, Y 2 O 3 : 0-5%, and clarifier: 0-0.8%. The amount of RO is the total content of MgO, CaO, SrO, and BaO, and Rn 2 The amount of O is Li 2 O, Na 2 O and K 2 The total content of O is Sb 2 O 3 , SnO 2 , Na 2 SiF 6 , and K 2 SiF 6 It is one or more of the following.

9. 5. The glass composition according to claim 1, comprising one or more components selected from the following group in weight percent: SiO 2 : 56-68%, B 2 O 3 : 7-13%, Al 2 O 3 : 1~5%, ZnO: 4~8%, TiO 2 : 0.2-3%, Rn 2 O: 8-18%, RO: 0-10%, ZrO 2 : 0-1%, Y 2 O 3 : 0-3%, and clarifier: 0-0.5%. The amount of RO is the total content of MgO, CaO, SrO, and BaO, and Rn 2 The amount of O is Li 2 O, Na 2 O and K 2 The total content of O is Sb 2 O 3 , SnO 2 , Na 2 SiF 6 , and K 2 SiF 6 It is one or more of the following.

10. 5. The glass composition according to claim 1, comprising one or more components selected from the following group in weight percent: Li 2 O: 0.1-5%, Na 2 O: 5-15%, K 2 The group consisting of O: 0-8%, CaO: 0-10%, and BaO: 0-10%.

11. 5. The glass composition according to claim 1, comprising one or more components selected from the following group in weight percent: Li 2 O: 0.5-2%, Na 2 O: 7-13%, K 2 The group consisting of O: 0-5%, CaO: 0-5%, and BaO: 0-5%.

12. 5. The glass composition according to claim 1, which satisfies one or more of the following two conditions: 1) K 2 O / (Na 2 O+Li 2 O) (weight ratio) is 0 to 0.8; 2) K 2 O / Na 2 O (weight ratio) is 0.01 to 0.

8.

13. 5. The glass composition according to claim 1, which satisfies one or more of the following three conditions: 1) K 2 O / (Na 2 O+Li 2 O) (weight ratio) is 0.1 to 0.3; 2) Li 2 O / Na 2 O (weight ratio) 0.03-0.22; 3) K 2 O / Na 2 O (weight ratio) is 0.1 to 0.

4.

14. A glass composition according to any one of claims 1 to 4, comprising a fining agent, wherein the N element content in the glass raw materials is less than 2.0%, and the N element content is the amount of N element introduced to melt 100 kg of theoretical glass / 10 kg of glass weight × 100%.

15. A glass composition according to any one of claims 1 to 4, comprising a fining agent, wherein the N element content in the glass raw materials is less than 1.0%, and the N element content is the amount of N element introduced to melt 100 kg of theoretical glass / 100 kg of glass weight × 100%.

16. Refractive index n d is 1.50 to 1.56, Abbe number ν d The glass composition according to any one of claims 1 to 4, wherein the σ is 56 to 65.

17. Refractive index n d is 1.51 to 1.54, Abbe number ν d The glass composition according to any one of claims 1 to 4, wherein the σ is 57.5 to 62.

18. A glass composition according to any one of claims 1 to 4, which satisfies one or more of the following ten conditions: 1) Acid resistance stability D A is Class 2 or higher. 2) Water resistance stability D W is Class 2 or higher. 3) Thermal expansion coefficient α 20 / 300℃ is 85 x 10 -7 / K or less. 4) Transition temperature T g is 580°C or less. 5) Density ρ is 2.70 g / cm 3 The following is the result. 6) Light transmittance τ 400nm is 98.0% or more. 7) The increase in turbidity after a 200-hour weather resistance test is 2.0% or less. 8) The foaming level is A grade or higher. 9) The stripes are C grade or higher. 10) The high temperature viscosity at 1400℃ is 220dPaS or less.

19. A glass composition according to any one of claims 1 to 4, which satisfies one or more of the following ten conditions: 1) Acid resistance stability D A is Class 1. 2) Water resistance stability D W is Class 1. 3) Thermal expansion coefficient α 20 / 300℃ is 80 x 10 -7 / K or less. 4) Transition temperature T g is 560°C or less. 5) Density ρ is 2.60 g / cm 3 The following is the result. 6) Light transmittance τ 400nm is 99.2% or more. 7) The increase in turbidity after a 200-hour weather resistance test is 0.5% or less. 8) Bubble level: A 00 It is a grade. 9) The stripes are grade B or higher. 10) The high temperature viscosity at 1400°C is 150 dPaS or less.

20. A glass preform comprising the glass composition according to any one of claims 1 to 4.

21. An optical element manufactured from the glass composition according to any one of claims 1 to 4 or a glass preform made from said glass composition.

22. An optical device comprising a member made of the glass composition according to any one of claims 1 to 4.

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