Glass substrate for information storage optical disc, and method of manufacturing and use thereof

Abstract

The application discloses a glass substrate for information storage optical disc and a preparation method and application thereof, and belongs to the technical field of glass substrate preparation. The raw materials of the glass substrate comprise, in terms of mole percentage, 65-72% of SiO2, 10-16% of Al2O3, 1-6% of B2O3, 2-6% of MgO, 4-12% of CaO, 0-3% of SrO, 0-5% of BaO, 0-2% of ZnO, 0-3% of Y2O3, 0-2% of La2O3, 0-2% of P2O5 and 0-0.2% of SnO2. The mole ratio of Al2O3 / (MgO+CaO+SrO+BaO) is 0.8-1.2, and the mole ratio of MgO / (MgO+CaO+SrO+BaO) is 0.25-0.35. The glass substrate has nanoscale surface roughness and excellent chemical stability, and meanwhile meets the use requirements of the glass substrate for information storage optical disc in terms of transmittance, elastic modulus, glass transition temperature and other key performances.

Description

Technical Field

[0001] This invention belongs to the field of glass substrate preparation technology, specifically relating to a glass substrate for information storage optical discs, its preparation method, and its application. Background Technology

[0002] As a research hotspot for next-generation ultra-large capacity, low-cost, and ultra-long-life glass multidimensional storage technology, this technology boasts advantages such as fast read / write speeds, small size, low cost, long data retention time, large capacity, long lifespan, and environmental friendliness. It addresses the core issue of slow write speeds in traditional glass multidimensional storage technologies. In the future, it can be widely used in archival storage, data centers, and cloud storage markets, driving revolutionary progress in data storage technology and disrupting existing warm / cold data storage technologies.

[0003] Traditional plastic-based CDs, DVDs, and Blu-ray discs have significant drawbacks. For example, their data retention is relatively short; over time, data may become difficult to read or even be lost. Furthermore, they are extremely sensitive to environmental factors; changes in temperature and humidity, magnetic field interference, and water corrosion can all cause irreversible damage, severely impacting data integrity and readability. In contrast, glass-based CDs, DVDs, and Blu-ray discs, with their extremely long data retention and high tolerance to environmental factors (such as temperature, humidity, magnetic fields, and water), are the ideal choice for long-term, secure archival storage.

[0004] Therefore, the urgent need to develop a glass substrate with nanoscale surface roughness and excellent chemical stability, while meeting the key performance requirements for information storage optical discs in terms of transmittance, elastic modulus and glass transition point, will accelerate the implementation of glass storage technology. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a glass substrate for information storage optical discs, its preparation method and application, which has nanoscale surface roughness and excellent chemical stability, and meets the requirements for use of glass substrates for information storage optical discs in key properties such as transmittance, elastic modulus and glass transition temperature.

[0006] To achieve the above objectives, the present invention employs the following technical solution: This invention provides a glass substrate for information storage optical discs. The raw materials of the glass substrate, by molar percentage, include: 65%~72% SiO2, 10%~16% Al2O3, 1%~6% B2O3, 2%~6% MgO, 4%~12% CaO, 0%~3% SrO, 0%~5% BaO, 0%~2% ZnO, 0~3% Y2O3, 0~2% La2O3, 0~2% P2O5, and 0~0.2% SnO2. The molar ratio of Al2O3 / (MgO+CaO+SrO+BaO) is 0.8~1.2, and the molar ratio of MgO / (MgO+CaO+SrO+BaO) is 0.25~0.35.

[0007] In one embodiment, the surface roughness of the glass substrate is not greater than 0.30 nm.

[0008] In one embodiment, the glass substrate is etched with a 10% hydrofluoric acid solution at 22°C for 20 minutes, and the etch amount is no greater than 4.0 mg / cm². 2 At 95°C, the glass substrate was etched with a 5% hydrochloric acid solution for 24 hours, and the erosion amount was no greater than 0.7 mg / cm². 2 At 95°C, the glass substrate was etched with a 5% sodium hydroxide solution for 6 hours, and the erosion amount was no greater than 0.8 mg / cm². 2 .

[0009] In one embodiment, the transmittance of the glass substrate is not less than 91%.

[0010] In one embodiment, the elastic modulus of the glass substrate is not less than 84 GPa.

[0011] In one embodiment, the glass transition point of the glass substrate is not less than 710°C.

[0012] The present invention also provides a method for preparing the above-mentioned glass substrate for information storage optical discs, comprising the following steps: S1: Weigh and mix the materials according to the raw material composition ratio of the glass substrate; S2: The uniformly mixed raw materials are melted at high temperature, and then successively clarified, homogenized, shaped and annealed to obtain a glass substrate for information storage optical discs.

[0013] In one embodiment, the clarification temperature is 1645℃~1680℃, and the holding time is 180min~300min.

[0014] In one embodiment, the annealing temperature process is as follows: hold at 800°C for 240 minutes, then cool down to 580°C at a rate of 10°C / h, then cool down to 200°C at a rate of 20°C / h, and finally cool to room temperature.

[0015] The present invention also provides an application of the glass substrate for information storage optical discs as described above in information storage optical discs.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a glass substrate for optical discs used in information storage. By precisely controlling and adjusting the amounts of SiO2, Al2O3, B2O3, MgO, CaO, SrO, BaO, ZnO, Y2O3, La2O3, P2O5, and SnO2, the molar ratio of Al2O3 / (MgO+CaO+SrO+BaO) is ensured to be 0.8~1.2, and the molar ratio of MgO / (MgO+CaO+SrO+BaO) is ensured to be 0.25~0.35. This balances the synergistic mechanism among the components, ultimately endowing the glass substrate with nanoscale surface roughness and excellent chemical stability. Simultaneously, it meets the requirements for use as a glass substrate for optical discs in key properties such as transmittance, elastic modulus, and glass transition temperature. SiO2, as the optimal glass-forming agent, forms the glass framework, increasing viscosity, reducing crystallization tendency, and improving chemical stability, thermal stability, mechanical strength, and transparency. However, excessive SiO2 content increases the difficulty of glass melting. Therefore, the SiO2 content ranges from 65% to 72%. Al2O3, as a network intermediate, forms an interpenetrating network structure of aluminum-oxygen tetrahedra and silicon-oxygen tetrahedra, which increases network stability, increases elastic modulus, and inhibits glass crystallization. However, excessive content increases the difficulty of glass melting and reduces the coefficient of thermal expansion. Therefore, the Al2O3 content ranges from 10% to 16%. B2O3 is used to reduce glass viscosity and also acts as a flux to lower the softening point of the obtained glass. Therefore, the B2O3 content ranges from 1% to 6%. MgO, CaO, SrO, and BaO are alkaline earth metal oxides. As network exogenous substances, they effectively reduce glass viscosity, increase the glass's activity, make it easier to melt and clarify, and improve its chemical stability. MgO content is particularly effective in increasing the elastic modulus, but excessive content can easily lead to devitrification. Therefore, the MgO content ranges from 2% to 6%. Excessive CaO content increases the tendency for glass crystallization; therefore, the CaO content ranges from 4% to 12%. Excessive SrO content increases glass density and facilitates crystallization; therefore, the SrO content should be limited to 0-3%. Excessive BaO content reduces glass melting performance and strength; therefore, the SrO content should be limited to 0-5%. ZnO improves the chemical stability and melting performance of glass, and lowers its coefficient of thermal expansion; however, excessive content leads to devitrification and a lower strain point. Therefore, the ZnO content should be limited to 0-2%. Y₂O₃ improves the glass's resistance to devitrification and increases its elastic modulus; however, excessive content reduces chemical stability and the coefficient of thermal expansion. Therefore, the Y₂O₃ content should be limited to 0-3%. La₂O₃, as a network intermediate, improves the glass's structural compactness and elastic modulus; however, excessive content significantly reduces the coefficient of thermal expansion. Therefore, the Y₂O₃ content should be limited to 0-2%. P₂O₅ increases the strain point and lowers the glass's liquidus temperature; however, excessive content causes phase separation.Therefore, the range of P2O5 is 0~2%. SnO2 is added as a glass setter to help eliminate bubbles in the molten glass; therefore, the range of SnO2 is 0~0.2%.

[0017] The molar ratio of Al2O3 / (MgO+CaO+SrO+BaO) is 0.8~1.2, which strengthens the network, suppresses phase separation, and improves surface roughness. Simultaneously, the dense network structure significantly enhances the glass's water resistance and acid resistance. The molar ratio of MgO / (MgO+CaO+SrO+BaO) is 0.25~0.35, which suppresses crystallization, ensures homogeneity, and facilitates the production of nanoscale flat surfaces. Sufficient Al2O3 and optimized MgO content give the glass substrate high rigidity and hardness, preventing data read / write failures caused by deformation or scratches during high-speed rotation or handling of optical discs. These two ratios are not simply numerical stacking, but profoundly embody the essence of glass composition design: the first ratio ensures the integrity and stability of the glass structure, while the second ratio ensures the feasibility and homogeneity of glass processing. The synergistic effect between the components ultimately provides a glass material with nanoscale surface roughness, chemical stability, and high mechanical strength, meeting the requirements for glass substrates used in information storage optical discs. Attached Figure Description

[0018] Figure 1 This is a flowchart of a method for preparing a glass substrate for information storage optical discs according to the present invention; Figure 2 The transmittance curves of a glass substrate for an information storage optical disc according to the present invention are shown from wavelengths from 200 nm to 1200 nm. Detailed Implementation

[0019] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0020] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0021] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0022] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0023] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0024] This invention provides a glass substrate for optical discs used for information storage, the raw materials of which, by molar percentage, comprise: 65%~72% SiO2, 10%~16% Al2O3, and 1%~6% B2O. 3、 The content is 2%~6% MgO, 4%~12% CaO, 0%~3% SrO, 0%~5% BaO, 0%~2% ZnO, 0~3% Y2O3, 0~2% La2O3, 0~2% P2O5, 0~0.2% SnO2, the molar ratio of Al2O3 / (MgO+CaO+SrO+BaO) is 0.8~1.2, and the molar ratio of MgO / (MgO+CaO+SrO+BaO) is 0.25~0.35.

[0025] The surface roughness of the glass substrate is no greater than 0.30 nm, and its resistance to hydrofluoric acid corrosion (10% HF, 22 °C, 20 min) is no greater than 4.0 mg / cm. 2 Its resistance to hydrochloric acid corrosion (5% HCl, 95 ℃, 24 h) is no greater than 0.7 mg / cm³. 2 Alkali corrosion resistance (5% NaOH, 95℃, 6 h) is no greater than 0.8 mg / cm³. 2 The glass substrate has a transmittance of not less than 91%, an elastic modulus of not less than 84 GPa, and a glass transition point of not less than 710℃.

[0026] like Figure 1 As shown, the above-mentioned method for preparing a glass substrate for information storage optical discs includes the following steps: S1: Weigh and mix the materials according to the raw material composition ratio of the glass substrate; S2: The uniformly mixed raw materials are melted at high temperature, and then successively clarified, homogenized, shaped and annealed to obtain a glass substrate for information storage optical discs; wherein, the clarification temperature is 1645℃~1680℃, and the holding temperature is 180min~300min; the annealing temperature process is: 800℃ for 240min, then cooled to 580℃ at a rate of 10℃ / h, then cooled to 200℃ at a rate of 20℃ / h, and finally cooled to room temperature.

[0027] The embodiments of this invention utilize the above-mentioned components and their proportions. After uniform mixing of the components, high-temperature melting is performed, followed by clarification, homogenization, molding, and annealing to obtain a glass substrate for information storage optical discs. This results in a glass substrate with nanoscale surface roughness and excellent chemical stability, while meeting the requirements for information storage optical disc glass substrates in terms of key properties such as transmittance, elastic modulus, and glass transition point.

[0028] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0029] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0030] Example 1 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 72% SiO2, 12% Al2O3, 1% B2O3, 3.75% MgO, 8.25% CaO and 3% SrO evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0031] Example 2 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 66.93% SiO2, 13.31% Al2O3, 4.43% B2O3, 4.12% MgO, 4.14% CaO, 5% BaO, 1.51% Y2O3 and 0.57% La2O3 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0032] Example 3 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 68.52% SiO2, 12.99% Al2O3, 1% B2O3, 2.71% MgO, 4.81% CaO, 3.31% BaO, 2.56% Y2O3, 2% La2O3, 2% P2O5, and 0.1% SnO2 evenly, by molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0033] Example 4 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 70.77% SiO2, 10% Al2O3, 6% B2O3, 2% MgO, 6.15% CaO, 2% ZnO, 2% La2O3, 0.88% P2O5, and 0.2% SnO2 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0034] Example 5 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 65% SiO2, 14.64% Al2O3, 6% B2O3, 3.96% MgO, 7.9% CaO, 0.3% BaO, 2% La2O3 and 0.2% SnO2 in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0035] Example 6 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 68.37% SiO2, 13.24% Al2O3, 3.2% B2O3, 4.92% MgO, 6.88% CaO, 2.26% BaO, 1% P2O5, and 0.13% SnO2 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0036] Example 7 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 69.65% SiO2, 12.55% Al2O3, 2% B2O3, 3.52% MgO, 4% CaO, 2.83% SrO, 0.36% BaO, 1.04% ZnO, 3% Y2O3, 0.57% La2O3, and 0.48% P2O5 evenly according to the molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0037] Example 8 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 66.14% SiO2, 16% Al2O3, 1% B2O3, 3.53% MgO, 7.79% CaO, 2.01% BaO, 0.83% ZnO, 1.5% Y2O3, 1% La2O3, and 0.2% SnO2 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0038] Example 9 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 65.94% SiO2, 13.72% Al2O3, 1% B2O3, 6% MgO, 4% CaO, 2.14% SrO, 5% BaO, 2% P2O5 and 0.2% SnO2 in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0039] Example 10 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 67% SiO2, 13% Al2O3, 2.95% B2O3, 3.9% MgO, 12% CaO, 1% Y2O3 and 0.15% SnO2 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0040] Example 11 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 68.7% SiO2, 14.81% Al2O3, 1.57% B2O3, 4.61% MgO, 5.79% CaO, 1.18% SrO, 3.16% BaO, and 0.18% SnO2 in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0041] Example 12 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 67.45% SiO2, 13.2% Al2O3, 5% B2O3, 3.5% MgO, 6.7% CaO, 1% SrO, 1.5% BaO, 0.8% ZnO, 0.7% Y2O3, and 0.15% SnO2 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0042] Example 13 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 70.31% SiO2, 11.7% Al2O3, 1.57% B2O3, 4.61% MgO, 4.79% CaO, 1.18% SrO, 3.66% BaO, 2% Y2O3, 0.05% P2O5, and 0.13% SnO2 evenly. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0043] Example 14 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 68.21% SiO2, 12.8% Al2O3, 3.57% B2O3, 4.61% MgO, 4.29% CaO, 1.18% SrO, 4.66% BaO, 0.5% Y2O3, and 0.18% SnO2 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0044] Example 15 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 67.3% SiO2, 13.2% Al2O3, 3% B2O3, 4% MgO, 11.5% CaO, 0.85% Y2O3, 0.05% P2O5, and 0.1% SnO2 evenly in molar percentage. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0045] Example 16 A method for preparing a glass substrate for information storage optical discs includes the following steps: S1: According to the raw material composition ratio of the glass substrate, weigh and mix 67.12% SiO2, 14.89% Al2O3, 1.57% B2O3, 4.61% MgO, 5.79% CaO, 1.18% SrO, 3.66% BaO, 0.5% Y2O3, 0.5% La2O3, and 0.18% SnO2 evenly. S2: The uniformly mixed raw materials are melted at high temperature, and then clarified, homogenized, shaped and annealed to obtain the glass substrate for information storage optical discs.

[0046] The obtained glass substrate is subjected to various performance tests or treatments. The specific treatment methods, testing methods, and judgment criteria are as follows: The surface roughness of the glass was tested according to GB / T 45505.2-2025.

[0047] The chemical stability of the glass was tested according to GB / T 32644-2016. The test conditions were as follows: a) 10% HF, etched at 22℃ for 20 min; b) 5% HCl, etched at 95℃ for 24 h; c) 5% NaOH, etched at 95℃ for 6 h.

[0048] The transmittance of the glass was tested according to GB / T 45505.5-2025.

[0049] Differential scanning calorimetry (DSC) was used to test glass transition temperatures, etc. The test temperature range was 30–1400℃, the heating rate was 10℃ / min, and the protective gas during the test was N2.

[0050] The elastic modulus of glass was tested according to GB / T 45505.4-2025.

[0051] The forming temperature of the glass was tested using an Orton RSV-1700 high-temperature viscometer.

[0052] The glass substrates of Examples 1-16 were tested for surface roughness, chemical stability, transmittance, and elastic modulus. The test results are shown in Tables 1 and 2 below: Table 1

[0053] Table 2

[0054] like Figure 2 It is understood that the present invention provides a glass substrate for information storage optical discs with a transmittance of not less than 91%, which meets the application requirements of glass substrates for information storage optical discs.

[0055] This invention provides a glass substrate for optical discs used for information storage, the raw materials of which, by molar percentage, comprise: 65%~72% SiO2, 10%~16% Al2O3, and 1%~6% B2O. 3、The composition comprises 2%~6% MgO, 4%~12% CaO, 0%~3% SrO, 0%~5% BaO, 0%~2% ZnO, 0~3% Y₂O₃, 0~2% La₂O₃, 0~2% P₂O₅, and 0~0.2% SnO₂. In this embodiment of the invention, the above components and their proportions are mixed evenly and then melted at high temperature. After clarification, homogenization, molding, and annealing, a glass substrate for information storage optical discs is obtained. As can be seen from the above embodiments, this invention provides a glass substrate for information storage optical discs, its preparation method, and its application. The obtained glass substrate not only possesses nanoscale surface roughness and excellent chemical stability, but also meets the requirements for use as a glass substrate for information storage optical discs in key properties such as transmittance, elastic modulus, and glass transition temperature.

[0056] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A glass substrate for information storage optical discs, characterized in that, The raw materials of the glass substrate, by molar percentage, include: 65%~72% SiO2, 10%~16% Al2O3, 1%~6% B2O3, 2%~6% MgO, 4%~12% CaO, 0%~3% SrO, 0%~5% BaO, 0%~2% ZnO, 0~3% Y2O3, 0~2% La2O3, 0~2% P2O5, and 0~0.2% SnO2; The molar ratio of Al2O3 / (MgO+CaO+SrO+BaO) is 0.8~1.2, and the molar ratio of MgO / (MgO+CaO+SrO+BaO) is 0.25~0.

35.

2. The glass substrate for information storage optical discs according to claim 1, characterized in that, The surface roughness of the glass substrate is no greater than 0.30 nm.

3. The glass substrate for information storage optical discs according to claim 1, characterized in that, At 22°C, the glass substrate was etched with a 10% hydrofluoric acid solution for 20 minutes, and the erosion amount was no greater than 4.0 mg / cm². 2 ; At 95°C, after etching with a 5% hydrochloric acid solution for 24 hours, the erosion amount on the glass substrate is no greater than 0.7 mg / cm³. 2 ; At 95°C, the glass substrate was etched with a 5% sodium hydroxide solution for 6 hours, and the erosion amount was no greater than 0.8 mg / cm². 2 .

4. The glass substrate for information storage optical discs according to claim 1, characterized in that, The transmittance of the glass substrate is not less than 91%.

5. The glass substrate for information storage optical discs according to claim 1, characterized in that, The elastic modulus of the glass substrate is not less than 84 GPa.

6. The glass substrate for information storage optical discs according to claim 1, characterized in that, The glass substrate has a glass transition point of not less than 710°C.

7. A method for preparing a glass substrate for information storage optical discs as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1: Weigh and mix the materials according to the raw material composition ratio of the glass substrate; S2: The uniformly mixed raw materials are melted at high temperature, and then successively clarified, homogenized, shaped and annealed to obtain a glass substrate for information storage optical discs.

8. The method for preparing a glass substrate for an information storage optical disc according to claim 7, characterized in that, The clarification temperature is 1645℃~1680℃, and the holding time is 180min~300min.

9. The method for preparing a glass substrate for an information storage optical disc according to claim 7, characterized in that, The annealing temperature process is as follows: hold at 800℃ for 240 minutes, then cool down to 580℃ at a rate of 10℃ / h, then cool down to 200℃ at a rate of 20℃ / h, and finally cool to room temperature.

10. The application of a glass substrate for information storage optical disc as described in any one of claims 1 to 6 in an information storage optical disc.

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