Optical glass with high refractive index and preparation method thereof

Abstract

The present invention relates to the field of optical glass, and in particular to an optical glass with a high refractive index and a method for preparing the same. The present invention provides an optical glass with a high refractive index, the raw materials of which include silicon dioxide, styrene, selenium atoms, sodium oxide, potassium oxide, calcium oxide, barium oxide, and lead oxide. The present invention also provides a method for preparing an optical glass with a high refractive index, comprising two steps: preparing S1 composite particles and preparing S2 optical glass. This method can form composite particles with a core-shell structure of Se-SiO2-PS; and then use the composite particles as a base material to synthesize optical glass. The optical glass obtained by this method not only has high tensile strength, high compressive strength, high corrosion resistance, and chemical stability, but also further improves the refractive index of the optical glass.

Description

Technical Field

[0001] The present invention relates to the field of optical glass, and in particular to an optical glass with a high refractive index and a preparation method thereof. Background Art

[0002] Optical glass, a cornerstone material for the manufacture of precision optical instruments and key optical components, boasts high light transmittance, a high refractive index, and stable optical properties. However, the rapid advancement of optical technology, particularly its in-depth application in high-tech fields such as aerospace, medical diagnostics, and information and communications, has placed increasingly stringent demands on the performance of optical glass. Existing optical glass often struggles to meet these requirements in core performance areas, including refractive index, dispersion control, high transmittance retention, and thermal stability. Furthermore, its refractive index struggles to meet the specific requirements of certain high-end applications.

[0003] Specifically, while conventional optical glass has a wide range of refractive indices, its refractive index properties are insufficient for tasks such as high-precision focusing, imaging, or optical signal transmission at specific wavelengths. Therefore, the development of a new type of optical glass with a higher refractive index while also achieving excellent dispersion control, high transmittance, and thermal stability is not only a breakthrough in existing technological bottlenecks but also a pressing need to drive the continuous advancement of optical technology and meet the high-performance demands of future optical instruments. Summary of the Invention

[0004] In response to the above-mentioned existing technical problems, the present invention aims to provide an optical glass with a high refractive index and a preparation method thereof. The optical glass prepared by this method not only has high tensile strength, high compressive strength, high corrosion resistance and chemical stability, but also further improves the refractive index of the optical glass.

[0005] The present invention discloses an optical glass with a high refractive index, which is composed of the following components in weight ratio:

[0006] Silicon dioxide 40-60%; styrene 30-50%; selenium atoms 3-5%; sodium oxide 2-3%; potassium oxide 1-3%; calcium oxide 2-4%; barium oxide 1-2%; lead oxide 1-2%.

[0007] The present invention also discloses a method for preparing optical glass with a high refractive index, comprising the following process steps:

[0008] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, heat it up and melt it. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace and maintain the original temperature to continue the reaction for 1 to 2 hours. Then cool it down and add the solvent and styrene. After the addition is complete, continue stirring to cause a polymerization reaction. After the reaction is completed, obtain polystyrene-coated silica-selenium composite particles;

[0009] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to the glass kiln, heat and melt them, then add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature and stir, and after the reaction is completed, pour the molten mixture into shape, anneal, grind and polish to finally produce optical glass with a high refractive index.

[0010] Preferably, in the S1 composite particle preparation step, the heating and melting temperature of the high-temperature heat treatment furnace is 1700-1800°C.

[0011] Preferably, in the step of preparing the S1 composite particles, the temperature needs to be lowered to 80-100°C.

[0012] Preferably, in the S1 composite particle preparation step, the mass ratio of styrene to solvent is 1:(5-10).

[0013] Preferably, in the step of preparing the S1 composite particles, the solvent is a mixture of propanol and deionized water, wherein the volume ratio of propanol to deionized water is 1:(1-2).

[0014] Preferably, in the step of preparing the S1 composite particles, the stirring speed of the polymerization reaction is 1200 to 1500 rpm; and the polymerization reaction time is 2 to 4 hours.

[0015] Preferably, in the S2 optical glass preparation step, the glass kiln needs to be heated to 1400-1700° C.; and the temperature-controlled stirring time is 1-3 hours.

[0016] Preferably, in the S2 optical glass preparation step, pressure needs to be applied during the leak molding process, and the applied pressure range is 100-300 MPa.

[0017] Preferably, in the S2 optical glass preparation step, during the annealing process, the optical glass pulling speed needs to be controlled to be 2-5 cm / min, and the optical glass discharge speed needs to be controlled to be 80-120 kg / h.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a high-refractive-index optical glass, whose raw materials include silicon dioxide, styrene, selenium atoms, sodium oxide, potassium oxide, calcium oxide, barium oxide, and lead oxide. The silicon dioxide, styrene, and selenium atoms are prepared by a special method to produce composite particles of a Se-SiO2-PS core-shell structure. These composite particles are then melt-bonded with sodium oxide, potassium oxide, calcium oxide, barium oxide, and lead oxide to produce the high-refractive-index optical glass. The ratio of sodium oxide, potassium oxide, calcium oxide, barium oxide, and lead oxide in the raw materials must be strictly controlled, as improper addition can reduce the chemical stability and mechanical properties of the optical glass.

[0020] The present invention also provides a method for preparing optical glass with a high refractive index. This method involves injecting selenium atoms into a silica substrate at high temperature. After the selenium atoms and silica are fully bonded, the temperature is lowered and styrene is added to initiate a polymerization reaction, forming composite particles with a core-shell structure of Se-SiO2-PS. These composite particles are then used as a base material for synthesizing optical glass. The resulting optical glass exhibits high tensile strength, high compressive strength, high corrosion resistance, and chemical stability, while also further enhancing its refractive index. DETAILED DESCRIPTION

[0021] The following examples are provided for a better understanding of the present invention and are not intended to limit the best mode of implementation. They do not limit the content and scope of protection of the present invention. Any product identical or similar to the present invention obtained by anyone under the guidance of the present invention or by combining the features of the present invention with other prior arts shall fall within the scope of protection of the present invention.

[0022] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in this field can be used. If the manufacturer of the reagents or instruments is not specified, they are all commercially available conventional reagents.

[0023] Example 1: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0024] Silicon dioxide 60%; styrene 30%; selenium atoms 3%; sodium oxide 2%; potassium oxide 1%; calcium oxide 2%; barium oxide 1%; lead oxide 1%.

[0025] A method for preparing optical glass with a high refractive index comprises the following steps:

[0026] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1700°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 1 hour. Then lower the temperature of the high-temperature treatment furnace to 80°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:5; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:1; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1200rpm, and the polymerization reaction time is 2h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0027] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1400°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1400°C and stir for 1 hour. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 100 MPa, the optical glass pulling speed during the annealing process is 2 cm / min, and the optical glass discharge speed is 80 kg / h, and finally an optical glass with a high refractive index is obtained.

[0028] Example 2: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0029] Silicon dioxide 40%; Styrene 50%; Selenium atoms 3%; Sodium oxide 2%; Potassium oxide 1%; Calcium oxide 2%; Barium oxide 1%; Lead oxide 1%.

[0030] A method for preparing optical glass with a high refractive index comprises the following steps:

[0031] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1700°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 1 hour. Then lower the temperature of the high-temperature treatment furnace to 80°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:5; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:1; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1200rpm, and the polymerization reaction time is 2h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0032] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1400°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1400°C and stir for 1 hour. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 100 MPa, the optical glass pulling speed during the annealing process is 2 cm / min, and the optical glass discharge speed is 80 kg / h, and finally an optical glass with a high refractive index is obtained.

[0033] Example 3: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0034] Silicon dioxide 44%; styrene 37%; selenium atoms 5%; sodium oxide 3%; potassium oxide 3%; calcium oxide 4%; barium oxide 2%; lead oxide 2%.

[0035] A method for preparing optical glass with a high refractive index comprises the following steps:

[0036] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1700°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 1 hour. Then lower the temperature of the high-temperature treatment furnace to 80°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:5; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:1; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1200rpm, and the polymerization reaction time is 2h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0037] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1400°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1400°C and stir for 1 hour. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 100 MPa, the optical glass pulling speed during the annealing process is 2 cm / min, and the optical glass discharge speed is 80 kg / h, and finally an optical glass with a high refractive index is obtained.

[0038] Example 4: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0039] Silicon dioxide 46.5%; styrene 39%; selenium atoms 4%; sodium oxide 2.5%; potassium oxide 2%; calcium oxide 3%; barium oxide 1.5%; lead oxide 1.5%.

[0040] A method for preparing optical glass with a high refractive index comprises the following steps:

[0041] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1700°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 1 hour. Then lower the temperature of the high-temperature treatment furnace to 80°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:5; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:1; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1200rpm, and the polymerization reaction time is 2h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0042] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1400°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1400°C and stir for 1 hour. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 100 MPa, the optical glass pulling speed during the annealing process is 2 cm / min, and the optical glass discharge speed is 80 kg / h, and finally an optical glass with a high refractive index is obtained.

[0043] Example 5: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0044] Silicon dioxide 46.5%; styrene 39%; selenium atoms 4%; sodium oxide 2.5%; potassium oxide 2%; calcium oxide 3%; barium oxide 1.5%; lead oxide 1.5%.

[0045] A method for preparing optical glass with a high refractive index comprises the following steps:

[0046] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1750°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 1.5 hours. Then lower the temperature of the high-temperature treatment furnace to 90°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:7; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:1.5; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1350rpm, and the polymerization reaction time is 3h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0047] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1550°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1550°C and stir for 2 hours. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 200 MPa, the optical glass pulling speed during the annealing process is 3.5 cm / min, and the optical glass discharge speed is 100 kg / h, and finally an optical glass with a high refractive index is obtained.

[0048] Example 6: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0049] Silicon dioxide 46.5%; styrene 39%; selenium atoms 4%; sodium oxide 2.5%; potassium oxide 2%; calcium oxide 3%; barium oxide 1.5%; lead oxide 1.5%.

[0050] A method for preparing optical glass with a high refractive index comprises the following steps:

[0051] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1800°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 2 hours. Then lower the temperature of the high-temperature treatment furnace to 100°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:10; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:2; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1500rpm, and the polymerization reaction time is 4h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0052] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1700°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1700°C and stir for 2 hours. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 300 MPa, the optical glass pulling speed during the annealing process is 5 cm / min, and the optical glass discharge speed is 120 kg / h, and finally an optical glass with a high refractive index is obtained.

[0053] Example 7: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0054] Silicon dioxide 46.5%; Styrene 39%; Sodium oxide 2.5%; Potassium oxide 2%; Calcium oxide 3%; Barium oxide 1.5%; Lead oxide 1.5%.

[0055] A method for preparing optical glass with a high refractive index comprises the following steps:

[0056] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1750°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 1.5 hours. Then lower the temperature of the high-temperature treatment furnace to 90°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:7; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:1.5; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1350rpm, and the polymerization reaction time is 3h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0057] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1550°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1550°C and stir for 2 hours. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 200 MPa, the optical glass pulling speed during the annealing process is 3.5 cm / min, and the optical glass discharge speed is 100 kg / h, and finally an optical glass with a high refractive index is obtained.

[0058] Example 8: An optical glass with a high refractive index, comprising the following components in the following weight ratios:

[0059] Silicon dioxide 46.5%; selenium atoms 4%; sodium oxide 2.5%; potassium oxide 2%; calcium oxide 3%; barium oxide 1.5%; lead oxide 1.5%.

[0060] A method for preparing optical glass with a high refractive index comprises the following steps:

[0061] Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, raise the temperature of the high-temperature heat treatment furnace to 1750°C, and melt the silica in the furnace. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace, and then maintain the original temperature to continue the reaction for 1.5 hours. Then lower the temperature of the high-temperature treatment furnace to 90°C, add solvent and styrene, and the mass ratio of styrene to solvent is 1:7; the solvent is a mixture of propanol and deionized water, and the volume ratio of propanol to deionized water is 1:1.5; after the addition is completed, continue stirring to cause a polymerization reaction, the stirring rate of the polymerization reaction is 1350rpm, and the polymerization reaction time is 3h. After the reaction is completed, polystyrene-silica-selenium composite particles are obtained.

[0062] Preparation of S2 optical glass: Add the composite particles obtained in step S1 to a glass kiln, heat the glass kiln to 1550°C and melt the composite particles. After the composite particles are completely melted, add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature at 1550°C and stir for 2 hours. After the reaction is completed, the molten mixture is leaked into shape, annealed, ground and polished. The pressure during the leaking and molding process is controlled at 200 MPa, the optical glass pulling speed during the annealing process is 3.5 cm / min, and the optical glass discharge speed is 100 kg / h, and finally an optical glass with a high refractive index is obtained.

[0063] The optical glasses prepared in Examples 1 to 8 were subjected to performance tests, and the test results are shown in the following table:

[0064] Example Refractive index Tensile strength (MPa) Compressive strength (MPa) Is pH=10 corrosive? 1 1.79 65 94 no 2 1.78 66 96 no 3 1.80 68 99 no 4 1.81 71 103 no 5 1.85 76 110 no 6 1.82 67 97 no 7 1.65 59 85 yes 8 1.50 55 80 yes

[0065] Examples 1 to 4 and Examples 7 to 8 are screenings of the raw material ratios; Examples 4 to 6 are screenings of the preparation conditions. As can be seen from the data in the above table, the optical glasses prepared in Examples 1 to 6 all have good refractive index, tensile strength, compressive strength, and corrosion resistance, among which the experimental conditions and raw material ratios in Example 5 are the best. Compared with Example 5, Example 7 does not add selenium atoms to the raw materials, and Example 8 does not add styrene to the raw materials. The refractive index, tensile strength, compressive strength, and corrosion resistance of Examples 7 to 8 are all lower than those of Examples 1 to 6. This is because the optical glasses prepared in Examples 7 to 8 do not generate the core-shell structure of Se-SiO2-PS, so the chemical stability, mechanical properties, and refractive index are reduced.

[0066] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An optical glass with a high refractive index, characterized in that: Made with the following ingredients in the following weight ratios: Silicon dioxide 40-60%; Styrene 30-50%; Selenium atoms 3-5%; Sodium oxide 2-3%; Potassium oxide 1-3%; Calcium oxide 2-4%; Barium oxide 1-2%; Lead oxide 1-2%; The method for preparing the optical glass comprises the following steps: Preparation of S1 composite particles: Add silica to a high-temperature heat treatment furnace, heat it up and melt it. After the silica is completely melted, add selenium atoms to the high-temperature heat treatment furnace and maintain the original temperature to continue the reaction for 1-2 hours. Then cool it down and add the solvent and styrene. After the addition is complete, continue stirring to cause a polymerization reaction. After the reaction is completed, obtain polystyrene-coated silica-selenium composite particles; Preparation of S2 optical glass: Add the composite particles obtained in step S1 to the glass kiln, heat and melt them, then add sodium oxide, potassium oxide, calcium oxide, barium oxide and lead oxide in sequence, continue to control the temperature and stir, and after the reaction is completed, pour the molten mixture into shape, anneal, grind and polish to finally produce optical glass with a high refractive index.

2. The optical glass with a high refractive index according to claim 1, characterized in that: In the S1 composite particle preparation step, the heating and melting temperature of the high-temperature heat treatment furnace is 1700-1800°C.

3. The optical glass with a high refractive index according to claim 1, characterized in that: In the S1 composite particle preparation step, the temperature needs to be lowered to 80~100℃.

4. The optical glass with a high refractive index according to claim 1, characterized in that: In the S1 composite particle preparation step, the mass ratio of styrene to solvent is 1:(5-10).

5. The optical glass with a high refractive index according to claim 1, characterized in that: In the S1 composite particle preparation step, the solvent is a mixture of propanol and deionized water, wherein the volume ratio of propanol to deionized water is 1:(1~2).

6. The optical glass with a high refractive index according to claim 1, characterized in that: In the step of preparing the S1 composite particles, the stirring speed of the polymerization reaction is 1200-1500 rpm; and the polymerization reaction time is 2-4 hours.

7. The optical glass with a high refractive index according to claim 1, characterized in that: In the S2 optical glass preparation step, the glass kiln needs to be heated to 1400-1700°C; the temperature-controlled stirring time is 1-3 hours.

8. The optical glass with a high refractive index according to claim 1, characterized in that: In the S2 optical glass preparation step, pressure needs to be applied during the leak molding process, and the applied pressure range is 100-300MPa.

9. The optical glass with a high refractive index according to claim 1, characterized in that: In the S2 optical glass preparation step, during the annealing process, the optical glass pulling speed needs to be controlled at 2~5cm / min, and the optical glass discharge speed needs to be controlled at 80~120kg / h.