A borosilicate glass with high ultraviolet transmittance and a method for preparing the same

Abstract

The application relates to the field of glass production and specifically discloses a borosilicate glass with high ultraviolet transmittance, which comprises the following components in parts by weight: 70-75 parts of silicon oxide, 10-15 parts of boron oxide, 3-5 parts of sodium oxide, 1-2 parts of potassium oxide, 0.5-2 parts of calcium oxide, 0-0.5 parts of magnesium oxide, 0.5-1.5 parts of calcium fluoride and 0.3-0.8 parts of a clarifying agent; the preparation method has the advantages of simple operation; and the borosilicate glass adopts mixed alkali of potassium oxide and sodium oxide to optimize the network structure of the borosilicate glass, so that the ultraviolet transmittance of the borosilicate glass is improved.

Description

Technical Field

[0001] This application relates to the field of glass production, and more specifically, to a borosilicate glass with high ultraviolet transmittance and a method for preparing the same. Background Technology

[0002] Borosilicate glass, also known as borosilicate glass, refers to glass whose basic components are SiO2, B2O3, and Na2O. Borosilicate glass has many excellent properties, such as good thermal stability, chemical stability, mechanical properties, processing properties, and optical properties, and is widely used in electrophoresis, optics, photonics, and optoelectronics.

[0003] In related technologies, such as Chinese Patent Publication No. CN107117812A, a borosilicate glass and its preparation method are disclosed. The borosilicate glass is made from the following raw materials in parts by weight: 70-80 parts silicon dioxide, 10-15 parts boron trioxide, 0.4-0.6 parts aluminum trioxide, 3-6 parts sodium oxide, 1-3 parts calcium oxide, 0.04-0.06 parts germanium dioxide, 0.5-0.8 parts zirconium dioxide, and 1-4 parts magnesium oxide. The borosilicate glass of this invention has a high softening point, high impact resistance, and good thermal stability. Furthermore, by controlling the interaction between silicon dioxide and boron oxide, the density and integrity of the glass mesh are affected, the coefficient of thermal expansion of the glass is reduced, and the thermal stability of the glass is improved. Meanwhile, the preparation process is simple.

[0004] When borosilicate glass prepared by the above-mentioned technologies is used as a lens material for ultraviolet spectrometers, the ultraviolet transmittance of the borosilicate glass is low, which affects the spectral testing accuracy of the ultraviolet spectrometer. Summary of the Invention

[0005] In order to improve the ultraviolet transmittance of borosilicate glass and reduce the impact of low ultraviolet transmittance of borosilicate glass on the spectral accuracy of ultraviolet spectrometers, this application provides a borosilicate glass with high ultraviolet transmittance and a method for preparing the same.

[0006] In a first aspect, this application provides a borosilicate glass with high ultraviolet transmittance, employing the following technical solution:

[0007] A borosilicate glass with high ultraviolet transmittance comprises the following components in parts by weight: 70-75 parts silicon oxide, 15-18 parts boron oxide, 3-5 parts sodium oxide, 1-2 parts potassium oxide, 3.0-5.0 parts zinc oxide, 0.5-1.5 parts calcium fluoride, and 0.3-0.8 parts clarifying agent.

[0008] By adopting the above technical solution, the borosilicate glass of this application uses a mixed alkali of potassium oxide and sodium oxide to optimize the network structure of the borosilicate glass to improve its ultraviolet transmittance. In addition, the addition of calcium fluoride widens the ultraviolet transmission window of the borosilicate glass, and the addition of calcium fluoride and clarifying agent eliminates the bubble stripe scattering defects of the borosilicate glass, thereby further improving the ultraviolet transmittance of the borosilicate glass. This further improves the problem of the low ultraviolet transmittance of borosilicate glass affecting the spectral testing accuracy of the ultraviolet spectrometer.

[0009] Preferably, the borosilicate glass further comprises 2 to 4 parts by weight of magnesium oxide.

[0010] By adopting the above technical solution, the magnesium ions generated after the addition of magnesium oxide can enter the small gaps that sodium and potassium ions cannot enter and occupy due to their small radius and high charge. At the same time, magnesium ions can attract surrounding oxygen ions through their strong electric field, causing the Si / BO network to shrink locally. In this process, the planar triangular structure of boron is weakened, and additional oxygen is provided for the coordination of boron atoms, thereby promoting the conversion of [BO3] to [BO4]. This increases the degree of polymerization of the entire glass network, improves the strength of the glass structure, and makes the transparency of the glass more uniform. Meanwhile, the formation of [BO4] can consume the highly mobile sodium and potassium ions into fixed charge-compensating ions, thereby reducing the number of alkali ions that can be exchanged by hydrogen ions, thus improving the chemical stability of the glass and maintaining the stability of the long-term ultraviolet transmittance of the glass. It also reduces the coefficient of thermal expansion of the glass and improves the mechanical strength of the glass.

[0011] Preferably, the borosilicate glass further comprises 1 to 1.5 parts by weight of alumina.

[0012] By adopting the above technical solution, alumina is added to silicate glass. Due to the differences in the length, bond energy, and bond angle of aluminum-oxygen bonds and silicon-oxygen bonds, the glass network of borosilicate glass is disturbed, making the glass network disordered. This disordered glass network increases the difficulty of crystal nucleation and growth, making the glass less prone to crystallization, thereby further improving the ultraviolet transmittance of the glass. In addition, after the addition of alumina, aluminum ions preferentially form [AlO4] tetrahedra and stably embed themselves in the network, making them unable to move. At the same time, the high field strength of aluminum ions can fix surrounding mobile ions such as calcium and magnesium ions through electrostatic attraction, significantly reducing the mobility of mobile ions, thereby improving the optical stability, water resistance, acid resistance, and other properties of borosilicate glass.

[0013] Preferably, the clarifying agent is tin oxide.

[0014] By employing the above technical solution, magnesium ions enter the network voids and compress the surrounding Si / BO network through a high field strength, narrowing the ion migration channels and slowing down the exchange rate of hydrogen ions and sodium ions. The addition of tin oxide generates tetravalent tin ions, which enter the glass network to form [SnO4] tetrahedra and consume exchangeable Na+. + / K + As a charge compensation and to form stronger Sn-O-Si bonds, the combination of magnesium oxide and tin oxide can reduce the driving force of corrosion reactions such as glass hydrolysis from both physical and chemical perspectives, thereby improving the stability of the glass.

[0015] Preferably, the borosilicate glass further comprises 0.5 to 1 part by weight of lanthanum oxide.

[0016] By adopting the above technical solution, lanthanum oxide added to glass can act as a network stabilizer in borosilicate glass. In addition, as an external ion of the network, lanthanum ions, with their strong charge attraction and bonding ability, attract surrounding broken bond structures to aggregate and bond, thereby increasing the three-dimensional connectivity of the glass network and making the overall structure more compact and robust. This allows lanthanum ions to promote the rapid formation of a gel-like protective layer on the glass surface in the early stage of solution erosion of the glass. This "barrier" will significantly reduce the initial dissolution rate of the glass in aqueous solution and effectively prevent or delay the further diffusion of water molecules and hydrogen ions into the glass interior, thereby improving the chemical stability of the glass.

[0017] Preferably, the borosilicate glass further comprises 0.2 to 0.5 parts by weight of calcium oxide.

[0018] By adopting the above technical solution, after the addition of calcium oxide, calcium ions can form a synergistic "ion extrusion" with the magnesium ions originally in the glass, making the glass network more compact and improving the chemical stability of borosilicate glass by 10-20%. At the same time, the fluxing effect of calcium ions can reduce viscosity, improve the clarification effect, and shorten the clarification time of borosilicate glass.

[0019] Preferably, the borosilicate glass further comprises 0.2 to 0.5 parts by weight of sodium sulfate.

[0020] By adopting the above technical solution, the addition of sodium sulfate can form a composite clarifying system with tin oxide, and the two clarifying agents can release gas in turn at different temperature stages, so that the bubbles in the borosilicate glass can be removed more thoroughly. After the addition of sodium sulfate, it decomposes to produce sodium oxide, which can provide strong oxygen to reduce the viscosity of the glass and improve the clarification effect. However, the addition of free oxygen in this process may cause the network to loosen. The combination of calcium oxide and magnesium oxide in this application offsets this risk brought by sodium sulfate, so that the glass can achieve a better balance between easy clarification and high chemical stability.

[0021] Secondly, this application provides a method for preparing borosilicate glass with high ultraviolet transmittance, employing the following technical solution:

[0022] A method for preparing borosilicate glass with high ultraviolet transmittance includes the following steps:

[0023] S1. Weigh each component according to its mass fraction;

[0024] S2. Melt all the components to obtain molten glass;

[0025] S3. Add the molten glass to the preheated mold to form the glass, and gradually cool it to room temperature to obtain the glass.

[0026] By adopting the above technical solution, the preparation method of this application has the advantage of simple operation.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. The borosilicate glass of this application uses a mixture of potassium oxide and sodium oxide as alkali to optimize the network structure of the borosilicate glass to improve its ultraviolet transmittance. In addition, the addition of calcium fluoride widens the ultraviolet transmission window of the borosilicate glass, and the addition of calcium fluoride and clarifying agent eliminates the bubble stripe scattering defects of the borosilicate glass, thereby further improving the ultraviolet transmittance of the borosilicate glass and further improving the problem of the low ultraviolet transmittance of borosilicate glass affecting the spectral testing accuracy of the ultraviolet spectrometer.

[0029] 2. This application uses magnesium oxide, which allows magnesium ions to enter small gaps that sodium and potassium ions cannot access or occupy due to their small radius and high charge. Simultaneously, magnesium ions attract surrounding oxygen ions through their strong electric field, causing localized contraction of the Si / BO network. This process weakens the planar triangular structure of boron and provides additional oxygen for boron atom coordination, thus promoting the conversion of [BO3] to [BO4]. This increases the degree of polymerization of the entire glass network, improving the strength of the glass structure and making the transparency more uniform. Furthermore, the formation of [BO4] consumes highly mobile sodium and potassium ions into fixed charge-compensating ions, reducing the number of alkali ions that can be exchanged with hydrogen ions, thereby improving the chemical stability of the glass and maintaining its long-term UV transmittance stability. It also reduces the glass's coefficient of thermal expansion and increases its mechanical strength.

[0030] 3. The preparation method of this application has the advantage of being simple to operate. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the embodiments. The raw materials used in the present application are all commercially available. The purity of the raw materials in the present application is greater than 99.5%, and the content of iron oxide is less than 0.02%.

[0032] Example

[0033] Example 1

[0034] A method for preparing borosilicate glass with high ultraviolet transmittance includes the following steps:

[0035] S1. Weigh out each component according to the mass percentage: 70 kg silicon oxide, 15 kg boron oxide, 3 kg sodium oxide, 1 kg potassium oxide, 3 kg zinc oxide, 0.5 kg calcium fluoride, and 0.3 kg clarifying agent, wherein the clarifying agent is tin oxide.

[0036] S2. After loading each component into a crucible, place it in a furnace preheated to 300℃ and hold for 0.5h; then heat to 600℃ at a heating rate of 10℃±2℃ / min and hold for 0.5h; then heat to 900℃ at a heating rate of 6℃±2℃ / min and hold for 0.75h; then heat to 1450℃ at a heating rate of 10℃±2℃ / min and hold for 0.75h; then heat to 1620℃ at a heating rate of 5℃±2℃ / min, hold for 1.5h, and then stir for 0.5h to obtain molten glass, wherein the stirring speed is 40 r / min.

[0037] S3. After cooling the molten glass to 1300℃ at a cooling rate of 10℃±2℃ / min, pour the molten glass into a mold preheated to 530℃±10℃ to form the glass. Keep the mold containing the glass at 530℃±10℃ for 2 hours, then cool it to 300℃ at a cooling rate of 1℃ / min, then cool it to 100℃ at a cooling rate of 2℃ / min, and finally let it cool naturally to room temperature to obtain the glass.

[0038] Example 2

[0039] The difference between this embodiment and Embodiment 1 is as follows: S1, each component is weighed according to the mass fraction: 75 kg of silicon oxide, 18 kg of boron oxide, 5 kg of sodium oxide, 2 kg of potassium oxide, 5 kg of zinc oxide, 1.5 kg of calcium fluoride and 0.8 kg of clarifying agent, wherein the clarifying agent is tin oxide.

[0040] Example 3

[0041] The difference between this embodiment and Embodiment 1 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride and 0.6 kg of clarifying agent, wherein the clarifying agent is tin oxide.

[0042] Example 4

[0043] The difference between this embodiment and Embodiment 3 is that sodium chloride is used as the clarifying agent.

[0044] Example 5

[0045] The difference between this embodiment and embodiment 3 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent and 0.2 kg of magnesium oxide, wherein the clarifying agent is tin oxide.

[0046] Example 6

[0047] The difference between this embodiment and embodiment 5 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent and 1 kg of magnesium oxide, wherein the clarifying agent is tin oxide.

[0048] Example 7

[0049] The difference between this embodiment and embodiment 5 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent and 0.7 kg of magnesium oxide, wherein the clarifying agent is tin oxide.

[0050] Example 8

[0051] The difference between this embodiment and embodiment 7 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide and 1 kg of aluminum oxide, wherein the clarifying agent is tin oxide.

[0052] Example 9

[0053] The difference between this embodiment and embodiment 8 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide and 1.5 kg of aluminum oxide, wherein the clarifying agent is tin oxide.

[0054] Example 10

[0055] The difference between this embodiment and embodiment 8 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide and 1.2 kg of aluminum oxide, wherein the clarifying agent is tin oxide.

[0056] Example 11

[0057] The difference between this embodiment and Example 10 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide and 0.5 kg of lanthanum oxide, wherein the clarifying agent is tin oxide.

[0058] Example 12

[0059] The difference between this embodiment and Example 11 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide and 1 kg of lanthanum oxide, wherein the clarifying agent is tin oxide.

[0060] Example 13

[0061] The difference between this embodiment and Embodiment 11 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide and 0.7 kg of lanthanum oxide, wherein the clarifying agent is tin oxide.

[0062] Example 14

[0063] The difference between this embodiment and embodiment 13 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide, 0.7 kg of lanthanum oxide and 0.2 kg of calcium oxide, wherein the clarifying agent is tin oxide.

[0064] Example 15

[0065] The difference between this embodiment and embodiment 14 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide, 0.7 kg of lanthanum oxide and 0.5 kg of calcium oxide, wherein the clarifying agent is tin oxide.

[0066] Example 16

[0067] The difference between this embodiment and embodiment 14 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide, 0.7 kg of lanthanum oxide and 0.3 kg of calcium oxide, wherein the clarifying agent is tin oxide.

[0068] Example 17

[0069] The difference between this embodiment and Embodiment 16 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide, 0.7 kg of lanthanum oxide, 0.2 kg of calcium oxide and 0.2 kg of sodium sulfate, wherein the clarifying agent is tin oxide.

[0070] Example 18

[0071] The difference between this embodiment and Embodiment 17 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide, 0.7 kg of lanthanum oxide, 0.2 kg of calcium oxide and 0.5 kg of sodium sulfate, wherein the clarifying agent is tin oxide.

[0072] Example 19

[0073] The difference between this embodiment and Embodiment 17 is as follows: S1, each component is weighed according to the mass fraction: 72 kg of silicon oxide, 17 kg of boron oxide, 4 kg of sodium oxide, 1.5 kg of potassium oxide, 4 kg of zinc oxide, 1 kg of calcium fluoride, 0.6 kg of clarifying agent, 0.7 kg of magnesium oxide, 1.2 kg of aluminum oxide, 0.7 kg of lanthanum oxide, 0.2 kg of calcium oxide and 0.3 kg of sodium sulfate, wherein the clarifying agent is tin oxide.

[0074] Example 20

[0075] The difference between this embodiment and Embodiment 19 is that magnesium oxide was not used.

[0076] Example 21

[0077] The difference between this embodiment and Embodiment 19 is that calcium oxide was not used.

[0078] Comparative Example 1

[0079] A method for preparing borosilicate glass with high ultraviolet transmittance includes the following steps:

[0080] (1) Weigh out 70 kg of silicon dioxide, 10 kg of boron trioxide, 0.4 kg of aluminum trioxide, 3 kg of sodium oxide, 1 kg of calcium oxide, 0.04 kg of germanium dioxide, 0.5 kg of zirconium dioxide, and 1 kg of magnesium oxide.

[0081] (2) After mixing all the components evenly, the mixed material is put into the kiln for melting. The melting temperature is 1650℃ and the melting time is 5h.

[0082] (3) Pour the melted material into the mold for shaping;

[0083] (4) The formed glass is placed in an annealing furnace for annealing at a temperature of 550°C. After annealing, it is cut and polished to obtain borosilicate glass.

[0084] Performance testing

[0085] Ultraviolet transmittance test: The transmittance of ultraviolet light at wavelengths of 185nm, 290nm and 380nm was measured using an ultraviolet spectrophotometer.

[0086] Acid resistance test: Weigh a certain weight of borosilicate glass and record the initial weight (m0). Then, add 0.1 mol / L hydrochloric acid to immerse the borosilicate glass, and then heat it in a water bath at 100℃±5℃ for 24 hours. After heating, remove it and cool it to room temperature. Rinse the surface of the borosilicate glass with deionized water to remove residual acid. After drying at 50℃ for 48 hours, weigh it to obtain m1. Calculate the weight loss rate (%) according to Formula 1.

[0087] Alkali resistance test: Weigh a certain weight of borosilicate glass and record the initial weight (m0). Then, add 0.1 mol / L sodium hydroxide solution to immerse the borosilicate glass, and then heat it in a water bath at 100℃±5℃ for 24 hours. After that, take it out and cool it to room temperature. Rinse the surface of the borosilicate glass with deionized water to remove the residual alkali solution. After drying it at 50℃ for 48 hours, weigh it to obtain the final weight (m1) of the borosilicate glass. Calculate the weight loss rate (%) according to Formula 1.

[0088] Weight loss rate (%) = [(m0-m1) / m0] * 100%

[0089] Table 1

[0090]

[0091] As can be seen from Example 1, Comparative Example 1 and Table 1, the glass prepared in this application has the advantage of high ultraviolet transmittance.

[0092] As can be seen from Examples 19, 20, and 21 and Table 1, the glass prepared by the compound of calcium oxide, magnesium oxide, and sodium sulfate in Example 19 has significantly higher properties than the glass prepared in Examples 20 and 21. The reason is that sodium sulfate decomposes to produce sodium oxide after being added. Sodium oxide can provide strong oxygen to reduce the viscosity of the glass and improve the clarification effect. However, the addition of free oxygen in this process may cause the network to loosen. The compound of calcium oxide and magnesium oxide offsets this risk brought by sodium sulfate, so that the glass can achieve a better balance between easy clarification and high chemical stability.

[0093] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A borosilicate glass with high ultraviolet transmittance, characterized in that, It comprises the following components in parts by weight: 70-75 parts silicon dioxide, 15-18 parts boron oxide, 3-5 parts sodium oxide, 1-2 parts potassium oxide, 3-5 parts zinc oxide, 0.5-1.5 parts calcium fluoride, and 0.3-0.8 parts clarifying agent.

2. The borosilicate glass with high ultraviolet transmittance according to claim 1, characterized in that: The borosilicate glass further includes 0.2 to 1 part by weight of magnesium oxide.

3. The borosilicate glass with high ultraviolet transmittance according to claim 2, characterized in that: The borosilicate glass further includes 1 to 1.5 parts by weight of alumina.

4. The borosilicate glass with high ultraviolet transmittance according to claim 1, characterized in that: The clarifying agent is tin oxide.

5. The borosilicate glass with high ultraviolet transmittance according to claim 1, characterized in that: The borosilicate glass further includes 0.5 to 1 part by weight of lanthanum oxide.

6. The borosilicate glass with high ultraviolet transmittance according to claim 1, characterized in that: The borosilicate glass further includes 0.2 to 0.5 parts by weight of calcium oxide.

7. The borosilicate glass with high ultraviolet transmittance according to claim 1, characterized in that: The borosilicate glass further includes 0.2 to 0.5 parts by weight of sodium sulfate.

8. A method for preparing borosilicate glass with high ultraviolet transmittance, characterized in that: Includes the following steps: S1. Weigh each component according to its mass fraction; S2. Melt all the components to obtain molten glass; S3. Add the molten glass to the preheated mold to form the glass, and gradually cool it to room temperature to obtain the glass.

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