Silica-boron glass and production process thereof

Abstract

The invention relates to the technical field of borosilicate glass, in particular to borosilicate glass and a production process, and the borosilicate glass comprises the following components in percentage by mass: 72%-78% of SiO2, 6%-10% of B2O3, 2%-5% of Al2O3, 3%-5% of Na2O, 3%-8% of ZrO2, 0%-3% of SrO, 0%-1% of NaCl, 0.2%-1% of a clarifying agent, 0.01%-0.1% of a coloring agent, 1%-5% of a cosolvent, 2%-8% of a nucleating agent and 0.1%-1% of an ultraviolet light absorber. The borosilicate glass provided by the invention has relatively good chemical stability, relatively low thermal expansion coefficient and relatively good bending strength in actual use, modification operation can be carried out according to requirements, the use field in actual use is widened, and actual production and use are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of borosilicate glass, and in particular to borosilicate glass and a production process. Background Art

[0002] Borosilicate glass, also known as borosilicate glass, is a type of glass with silicon dioxide, boron oxide and sodium oxide as basic components. It has the advantages of good thermal stability, strong chemical stability, high hardness and good light transmittance.

[0003] However, in the actual production process, the silicon dioxide content in borosilicate glass is relatively high, which affects the production process and the properties of the finished product to a certain extent. It is prone to melting difficulties, high viscosity, increased brittleness, and a low thermal expansion coefficient but may cause thermal stress problems, thereby limiting the actual application areas of borosilicate glass and is not conducive to the development of the industry.

[0004] For this purpose, we propose a borosilicate glass and a production process. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a borosilicate glass and a production process.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A borosilicate glass, comprising the following components by mass percentage:

[0008] SiO2 72%-78%, B2O3 6%-10%, Al2O3 2%-5%, Na2O 3%-5%, ZrO2 3%-8%, SrO 0%-3%, NaCl 0%-1%, clarifier 0.2%-1%, colorant 0.01%-0.1%, solvent 1%-5%, nucleating agent 2%-8%, UV absorber 0.1%-1%.

[0009] As a preferred technical solution of the present application, the clarifier is NaNO3 or As2O3.

[0010] As a preferred technical solution of the present application, the colorant is Co2O3 or Fe2O3.

[0011] As a preferred technical solution of the present application, the co-solvent is CaF2.

[0012] As a preferred technical solution of the present application, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0013] As a preferred technical solution of the present application, the crystal nucleating agent is TiO2.

[0014] A production process of borosilicate glass comprises the following steps:

[0015] Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2O, ZrO2, SrO, NaCl, clarifier, colorant, cosolvent, crystal nucleation agent, ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device;

[0016] Step S2, melting treatment: placing the mixed raw materials in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1500°C-1700°C, and the melting time is maintained at 5-15h;

[0017] Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass. The glass melt is flowed to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized and impurities such as bubbles and nodules are discharged;

[0018] Step S4, forming annealing treatment: guiding the treated glass melt into the mold, performing forming operation by pressing method according to demand, and then placing the formed glass product in an annealing furnace, slowly heating it to a certain temperature, and then keeping it at this temperature for a period of time, so that the internal structure of the glass can be adjusted and the internal stress can be relaxed. The annealing temperature is 500°C-700°C, and the holding time is 3-10h;

[0019] Step S5, finished product modification treatment: The finished glass can also be selectively modified in other directions. Heat treatment modification can be selected to improve the strength of the glass, maintain the dimensional stability and optical uniformity of the glass, and surface coating modification can also be used to increase the function of the glass and expand its scope of use.

[0020] As a preferred technical solution of the present application, the surface coating modification in step S5 is selected as silicone coating or metal oxide coating. The silicone coating is used to effectively improve the hydrophobicity of the glass, and the metal oxide coating is used to give the finished glass good conductive properties.

[0021] The beneficial effects of the present invention are:

[0022] 1. The borosilicate glass proposed in the present invention effectively improves the chemical stability of the glass sample, reduces the thermal expansion coefficient, improves the toughness of the glass under thermal shock, and improves the bending strength of the glass, thereby improving the quality and facilitating durable use by adding ZrO2, a crystal nucleating agent whose main component is TiO2, and SrO and other components;

[0023] 2. Through the modification of glass in the production process, the glass can be selectively modified for actual use, so that the glass can have better hydrophobicity or conductivity, which can more conveniently improve the application field of glass products.

[0024] In summary, the borosilicate glass proposed in the present invention has good chemical stability and a low thermal expansion coefficient in actual use, has good bending strength in actual use, and can also be modified according to needs, thereby broadening the scope of use in actual use and facilitating actual production use. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Embodiment 1

[0027] A borosilicate glass, comprising the following components by mass percentage:

[0028] SiO2 72%, B2O 36%, Al2O 32%, Na2O 3%, ZrO 28%, NaCl 1%, clarifier 0.5%, colorant 0.01%, solvent 3%, crystal nucleating agent 4%, ultraviolet absorber 0.5%.

[0029] Furthermore, the clarifier is NaNO3.

[0030] Furthermore, the colorant is Co2O3.

[0031] Furthermore, the co-solvent is CaF2.

[0032] Furthermore, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0033] Furthermore, the crystal nucleating agent is TiO2.

[0034] A production process of borosilicate glass comprises the following steps:

[0035] Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2O, ZrO2, NaCl, clarifier, colorant, cosolvent, crystal nucleating agent, ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device;

[0036] Step S2, melting treatment: the mixed raw materials are placed in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1500°C, and the melting time is maintained at 8 hours;

[0037] Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass. The glass melt is flowed to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized and impurities such as bubbles and nodules are discharged;

[0038] Step S4, forming annealing treatment: the molten glass after the above treatment is guided into the mold, and the forming operation is performed by pressing method according to the demand, and then the formed glass product is placed in an annealing furnace, slowly heated to a certain temperature, and then kept at this temperature for a period of time to adjust the internal structure of the glass and relax the internal stress. The annealing temperature is 500°C and the holding time is 5h;

[0039] Step S5, finished product modification treatment: The finished glass can also be selectively modified in other directions. Heat treatment modification can be selected to improve the strength of the glass, maintain the dimensional stability and optical uniformity of the glass, and surface coating modification can also be used to increase the function of the glass and expand its scope of use.

[0040] Furthermore, in step S5, the surface coating modification is carried out by using an organic silicon coating to effectively improve the water repellency of the glass.

[0041] Embodiment 2

[0042] A borosilicate glass, comprising the following components by mass percentage:

[0043] SiO2 72%, B2O 36%, Al2O 32%, Na2O 3%, ZrO 23%, SrO 3%, NaCl 1%, clarifier 1%, colorant 0.1%, solvent 3%, crystal nucleating agent 4.9%, ultraviolet absorber 1%.

[0044] Furthermore, the clarifier is As2O3.

[0045] Furthermore, the colorant is Fe2O3.

[0046] Furthermore, the co-solvent is CaF2.

[0047] Furthermore, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0048] Furthermore, the crystal nucleating agent is TiO2.

[0049] A production process of borosilicate glass comprises the following steps:

[0050] Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2O, ZrO2, SrO, NaCl, clarifier, colorant, cosolvent, crystal nucleation agent, ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device;

[0051] Step S2, melting treatment: the mixed raw materials are placed in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1600°C, and the melting time is maintained at 10 hours;

[0052] Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass. The glass melt is flowed to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized and impurities such as bubbles and nodules are discharged;

[0053] Step S4, forming annealing treatment: the molten glass after the above treatment is guided into the mold, and the forming operation is performed by pressing method according to the demand, and then the formed glass product is placed in an annealing furnace, slowly heated to a certain temperature, and then kept at this temperature for a period of time to adjust the internal structure of the glass and relax the internal stress. The annealing temperature is 600°C and the holding time is 7h;

[0054] Step S5, finished product modification treatment: The finished glass can also be selectively modified in other directions. Heat treatment modification can be selected to improve the strength of the glass, maintain the dimensional stability and optical uniformity of the glass, and surface coating modification can also be used to increase the function of the glass and expand its scope of use.

[0055] Furthermore, the surface coating modified in step S5 is selected as a metal oxide coating, which gives the finished glass product good electrical conductivity.

[0056] Embodiment 3

[0057] A borosilicate glass, comprising the following components by mass percentage:

[0058] SiO2 72%, B2O 36%, Al2O 32%, Na2O 3%, ZrO 28%, SrO 3%, clarifier 0.2%, colorant 0.1%, solvent 2.7%, crystal nucleating agent 2%, ultraviolet absorber 1%.

[0059] Furthermore, the clarifier is NaNO3.

[0060] Furthermore, the colorant is Co2O3.

[0061] Furthermore, the co-solvent is CaF2.

[0062] Furthermore, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0063] Furthermore, the crystal nucleating agent is TiO2.

[0064] A production process of borosilicate glass comprises the following steps:

[0065] Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2, ZrO2, SrO, clarifier, colorant, cosolvent, crystal nucleating agent, ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device;

[0066] Step S2, melting treatment: the mixed raw materials are placed in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1700°C, and the melting time is maintained at 13 hours;

[0067] Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass. The glass melt is flowed to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized and impurities such as bubbles and nodules are discharged;

[0068] Step S4, forming annealing treatment: the molten glass after the above treatment is guided into the mold, and the forming operation is performed by pressing method according to the demand, and then the formed glass product is placed in an annealing furnace, slowly heated to a certain temperature, and then kept at this temperature for a period of time to adjust the internal structure of the glass and relax the internal stress. The annealing temperature is 700°C and the holding time is 9 hours;

[0069] Step S5, finished product modification treatment: The finished glass can also be selectively modified in other directions. Heat treatment modification can be selected to improve the strength of the glass, maintain the dimensional stability and optical uniformity of the glass, and surface coating modification can also be used to increase the function of the glass and expand its scope of use.

[0070] Furthermore, in step S5, the surface coating modified is selected as an organic silicon coating, which effectively improves the water repellency of the glass.

[0071]

[0072]

[0073] In the above table, the chemical stability experiment was carried out in the following way:

[0074] After soaking the glass sample in 0.5 mol / L sulfuric acid solution for 24 hours, take it out, wash it, dry it, and measure the mass change of the sample before and after soaking. The acid resistance of the glass is measured by calculating the mass loss rate, and the calculation formula is: mass loss rate = (mass before soaking - mass after soaking) / mass before soaking × 100%.

[0075] By comparing the three groups of examples, it can be seen that when the amount of SrO added increases, the chemical stability of the glass product can be effectively improved, and it can be better used in an acidic and alkaline environment to ensure actual stability;

[0076] It can also be effectively concluded that the increase in SrO content effectively reduces the thermal expansion coefficient of glass products, reduces the thermal stress generated by the glass in a temperature change environment, and indirectly improves the toughness of the glass under thermal shock conditions;

[0077] The increase in ZrO2 content can effectively improve the bending strength of glass products, and SrO also plays a certain role in promoting the bending strength of glass;

[0078] Glass products with a silicone coating on their surface have lower water absorption and better hydrophobicity, while glass products with a metal oxide coating on their surface have better conductivity and can be effectively used in the field of electronic equipment.

[0079] Comparative Example 1

[0080] A borosilicate glass, comprising the following components by mass percentage:

[0081] SiO2 78%, B2O3 10%, Al2O3 2%, Na2O 3%, NaCl 1%, clarifier 1%, colorant 0.01%, solvent 2%, crystal nucleating agent 3%, ultraviolet absorber 0.1%.

[0082] Furthermore, the clarifier is NaNO3.

[0083] Furthermore, the colorant is Co2O3 or Fe2O3.

[0084] Furthermore, the co-solvent is CaF2.

[0085] Furthermore, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0086] Furthermore, the nucleating agent is TiO2.

[0087] A production process of borosilicate glass comprises the following steps:

[0088] Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2O, NaCl, clarifier, colorant, solvent, crystal nucleating agent, ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device;

[0089] Step S2, melting treatment: the mixed raw materials are placed in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1700°C, and the melting time is maintained at 15 hours;

[0090] Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass. The glass melt is flowed to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized and impurities such as bubbles and nodules are discharged;

[0091] Step S4, forming annealing treatment: the molten glass after the above treatment is guided into the interior of the mold, and the forming operation is performed by pressing method according to the demand, and then the formed glass product is placed in an annealing furnace, slowly heated to a certain temperature, and then kept at this temperature for a period of time to adjust the internal structure of the glass and relax the internal stress. The annealing temperature is 700°C and the holding time is 6 hours.

[0092] Comparative Example 2

[0093] A borosilicate glass, comprising the following components by mass percentage:

[0094] SiO2 76%, B2O 39%, Al2O 33%, Na2O 4%, NaCl 1%, clarifier 1%, colorant 0.01%, solvent 5%, UV absorber 1%.

[0095] Furthermore, the clarifier is NaNO3.

[0096] Furthermore, the colorant is Co2O3.

[0097] Furthermore, the co-solvent is CaF2.

[0098] Furthermore, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0099] Furthermore, the nucleating agent is TiO2.

[0100] A production process of borosilicate glass comprises the following steps:

[0101] Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2O, NaCl, clarifier, colorant, co-solvent, and ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device;

[0102] Step S2, melting treatment: the mixed raw materials are placed in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1600°C, and the melting time is maintained at 12 hours;

[0103] Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass. The glass melt is flowed to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized and impurities such as bubbles and nodules are discharged;

[0104] Step S4, forming annealing treatment: the molten glass after the above treatment is guided into the interior of the mold, and the forming operation is performed by pressing method according to the demand, and then the formed glass product is placed in an annealing furnace, slowly heated to a certain temperature, and then kept at this temperature for a period of time to adjust the internal structure of the glass and relax the internal stress. The annealing temperature is 600°C and the holding time is 6 hours.

[0105] Comparative Example 3

[0106] A borosilicate glass, comprising the following components by mass percentage:

[0107] SiO2 72%, B2O 36%, Al2O 32%, Na2O 3%, ZrO 25%, SrO 2.7%, NaCl 1%, clarifier 0.2%, colorant 0.1%, solvent 1%, crystal nucleating agent 6%, ultraviolet absorber 1%.

[0108] Furthermore, the clarifier is NaNO3.

[0109] Furthermore, the colorant is Co2O3.

[0110] Furthermore, the co-solvent is CaF2.

[0111] Furthermore, the ultraviolet absorber is a benzotriazole ultraviolet absorber.

[0112] Furthermore, the nucleating agent is TiO2.

[0113] A production process of borosilicate glass comprises the following steps:

[0114] Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2O, ZrO2, SrO, NaCl, clarifier, colorant, cosolvent, crystal nucleation agent, ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device;

[0115] Step S2, melting treatment: placing the mixed raw materials in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1500°C, and the melting time is maintained at 10 hours;

[0116] Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass. The glass melt is flowed to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized and impurities such as bubbles and nodules are discharged;

[0117] Step S4, forming annealing treatment: the molten glass after the above treatment is guided into the interior of the mold, and the forming operation is performed by pressing method according to the demand, and then the formed glass product is placed in an annealing furnace, slowly heated to a certain temperature, and then kept at this temperature for a period of time to adjust the internal structure of the glass and relax the internal stress. The annealing temperature is 700°C and the holding time is 8 hours.

[0118]

[0119]

[0120] By comparing Example 1 with Comparative Examples 1, 2 and 3, it can be seen that:

[0121] In the production process of borosilicate glass, the amount of ZrO2 added has a great influence on the bending strength of glass products. The amount of ZrO2 added is positively correlated with the bending strength of glass. 2d The higher the content, the lower the bending strength of the glass, showing a negative correlation trend. The bending strength of glass products is also affected by SrO and the crystal nucleating agent with the composition of TiO2 to a certain extent, and also shows a positive correlation trend.

[0122] The amount of SrO added affects the thermal expansion stability and chemical stability of glass products, and shows a positive correlation trend.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A borosilicate glass, characterized in that: In terms of mass percentage, it includes the following components: SiO2 72%-78%, B2O3 6%-10%, Al2O3 2%-5%, Na2O 3%-5%, ZrO2 3%-8%, SrO 0%-3%, NaCl 0%-1%, clarifier 0.2%-1%, colorant 0.01%-0.1%, solvent 1%-5%, crystal nucleating agent 2%-8%, UV absorber 0.1%-1%.

2. The borosilicate glass according to claim 1, characterized in that: The clarifier is NaNO3 or As2O3.

3. The borosilicate glass according to claim 1, characterized in that: The colorant is Co2O3 or Fe2O3.

4. The borosilicate glass according to claim 1, characterized in that: The co-solvent is CaF2.

5. The borosilicate glass according to claim 1, characterized in that: The ultraviolet absorber is a benzotriazole ultraviolet absorber.

6. The borosilicate glass according to claim 1, characterized in that: The crystal nucleating agent is TiO2.

7. A process for producing borosilicate glass according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1, raw material pretreatment: according to the formulation requirements, high-purity SiO2, B2O3, Al2O3, Na2O, ZrO2, SrO, NaCl, clarifier, colorant, solvent, crystal nucleation agent, ultraviolet absorber are selected, and these raw materials are crushed into particles with a mesh size of 200 by a grinder, and then mixed by a device; Step S2, melting treatment: placing the mixed raw materials in a glass melting furnace for melting. During the melting process, the water doped in the raw materials dissipates in the form of bubbles. As the temperature gradually rises, the flux melts and reacts with the SiO2 network former to destroy the silicon oxygen network structure, causing the raw materials to begin to melt, and then B2O3 gradually dissolves and merges into the glass liquid to form a uniform glass melt. During the melting process, the temperature inside the glass melting furnace gradually rises to 1500°C-1700°C, and the melting time is maintained at 5-15h; Step S3, clarification and homogenization treatment: after melting, the taken out glass solution is fully stirred so that the clarifier is in full contact with the glass melt. During the clarification process, the gas generated by the decomposition of the clarifier forms bubble nuclei in the glass melt, and gradually grows and rises, bringing small bubbles in the glass melt out of the liquid surface, thereby achieving the purpose of removing bubbles and improving the clarity of the glass, and the glass melt flows to the platinum channel for gradient cooling. When cooling on the platinum channel, the temperature of the high temperature zone of the platinum channel is ensured to be 1500° C. and the temperature of the low temperature zone is ensured to be 1350° C. In this process, the glass melt is fully homogenized, and bubbles and nodule impurities are discharged; Step S4, forming annealing treatment: guiding the treated glass melt into the mold, performing forming operation by pressing method according to demand, and then placing the formed glass product in an annealing furnace, slowly heating it to a certain temperature, and then keeping it at this temperature for a period of time, so that the internal structure of the glass can be adjusted and the internal stress can be relaxed. The annealing temperature is 500°C-700°C, and the holding time is 3-10h; Step S5, finished product modification treatment: The finished glass can also be selectively modified in other directions. Heat treatment modification can be selected to improve the strength of the glass, maintain the dimensional stability and optical uniformity of the glass, and surface coating modification can also be used to increase the function of the glass and expand its scope of use.

8. A process for producing borosilicate glass according to claim 7, characterized in that: The surface coating modification in step S5 can be selected from organic silicon coating or metal oxide coating. Organic silicon coating can effectively improve the hydrophobicity of glass, while metal oxide coating can give the finished glass good electrical conductivity.

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