Sky blue glass and preparation method thereof

Abstract

The invention discloses sky blue glass and a preparation method thereof, and belongs to the technical field of glass preparation. The sky blue glass disclosed by the invention is prepared from the following components in percentage by weight: 65.7 percent to 67.8 percent of SiO2, 1.42 percent to 3.42 percent of Al2O3, 9.5 percent to 10.7 percent of CaO, 0 percent to 1.5 percent of MgO, 12.1 percent to 14.3 percent of Na2O, 0 percent to 2.2 percent of K2O, 0.02 percent to 0.18 percent of SO3, less than or equal to 0.014 percent of Fe2O3, 0.001 percent to 0.0045 percent of CoO and 5 percent to 7 percent of PbO. According to the invention, cobalt oxide is used as a coloring agent to color the glass without being influenced by atmosphere, and the glass can present a sky blue color with high transmittance under the condition that a small amount of 0.001-0.0045% of cobalt oxide is added.

Description

Technical Field

[0001] The invention relates to the technical field of glass preparation, and in particular to sky blue glass and a preparation method thereof. Background Art

[0002] In recent years, with the continuous improvement of people's living standards, quality of life and pursuit of life, the requirements for the use of glass products have become higher and higher. People's demand for glass products is not limited to its functional use, but more importantly, they pursue a taste of life and the aesthetic enjoyment brought by glass products. Therefore, in order to continuously meet people's expected color needs, a layer of varnish or lacquer with organic pigments is applied or sprayed on the surface of ordinary white or ultra-white glass to obtain coloring, but this method has defects, because the quality and durability of the coating will age over time, and thermal shock will also cause the coating to fall off, and the color will naturally fade. Therefore, colorants are usually added in the process of preparing glass to obtain colored glass.

[0003] In general blue glass, the main colorant is iron, and other common colorants include cobalt, selenium, nickel, chromium, manganese and titanium. When producing traditional colored glass, such as traditional blue, green or blue-green glass, the relative amounts of iron and other colorants must be precisely monitored and controlled within a specific operating range so that the glass has the desired final color and spectral properties for special applications. Changing the colorant outside this operating range will have an adverse effect on the final color of the glass. For example, increasing the amount of iron present in a certain glass composition will increase the difficulty of melting the glass batch materials, and sulfide gas will be discharged during the melting of these glasses, causing certain pollution to the environment, etc. According to the survey, the amount of cobalt oxide added to cobalt blue bulb glass is 1.2%, 1.4%, 1.6%, and 1.8%, respectively, the cobalt oxide content in dark blue plate glass is 0.16%, and the cobalt content in blue plate glass is 0.15%, etc. The cobalt oxide content is relatively high. Summary of the invention

[0004] The main purpose of the present invention is to provide a sky blue glass and a preparation method thereof, so as to solve the technical problem that a large amount of cobalt oxide needs to be added when preparing blue glass.

[0005] To achieve the above object, the present invention provides a sky blue glass, which comprises the following components calculated by weight percentage:

[0006] SiO2: 65.7%~67.8%,

[0007] Al2O3: 1.42%~3.42%,

[0008] CaO: 9.5%~10.7%,

[0009] MgO: 0%~1.5%,

[0010] Na2O: 14.3%~12.1%,

[0011] K2O: 0%~2.2%,

[0012] SO3: 0.02%~0.18%,

[0013] Fe2O3: ≤0.014%,

[0014] CoO: 0.001%~0.0045%,

[0015] PbO: 5%~7%.

[0016] In some embodiments of the present invention, the Na2O, CoO and K2O satisfy the following relationship: 2.5≤(Na2O-K2O) / 1000 / CoO≤10.

[0017] In some embodiments of the present invention, the sky blue glass comprises the following components calculated by weight percentage:

[0018] SiO2: 66.7%,

[0019] Al2O3: 2.6%,

[0020] CaO: 10.5%,

[0021] MgO: 0.767%,

[0022] Na2O: 12.1%,

[0023] K2O: 2.2%,

[0024] SO3: 0.1%,

[0025] Fe2O3: 0.012%,

[0026] CoO: 0.0010%,

[0027] PbO: 5.02%;

[0028] Or, calculated by weight percentage, the sky blue glass includes the following components:

[0029] SiO2: 67%,

[0030] Al2O3: 2%,

[0031] CaO: 9.5%,

[0032] MgO: 1.2%,

[0033] Na2O: 12.3%,

[0034] K2O: 2%,

[0035] SO3: 0.024%,

[0036] Fe2O3: 0.014%,

[0037] CoO: 0.002%,

[0038] PbO: 5.96%;

[0039] Or, calculated by weight percentage, the sky blue glass includes the following components:

[0040] SiO2: 66%,

[0041] Al2O3: 1.8%,

[0042] CaO: 10.7%,

[0043] MgO: 1.5%,

[0044] Na2O: 12.3%,

[0045] K2O: 2.1%,

[0046] SO3: 0.088%,

[0047] Fe2O3: 0.008%,

[0048] CoO: 0.004%,

[0049] PbO: 5.5%.

[0050] In some embodiments of the present invention, the color value L* of the sky blue glass ranges from 96.70 to 96.95, the color value a* ranges from 0.15 to 0.18, and the color value b* ranges from -0.24 to -0.50.

[0051] In some embodiments of the present invention, the light transmittance of the sky blue glass is greater than or equal to 91.6%.

[0052] The present invention also provides a method for preparing the sky blue glass as described above, comprising the following steps: mixing glass raw materials, melting, clarifying, molding, and annealing to obtain the sky blue glass.

[0053] In some embodiments of the present invention, in the melting step, the melting temperature is 1450°C to 1530°C.

[0054] In some embodiments of the present invention, in the clarifying step, the clarifying temperature is 1490°C to 1510°C.

[0055] In some embodiments of the present invention, in the step of forming, the forming temperature is 930°C to 970°C.

[0056] In some embodiments of the present invention, in the annealing step, the annealing temperature is 540°C to 560°C.

[0057] In some embodiments of the present invention, in the glass raw material mixing step, the order of materials is silica sand, soda ash, limestone, feldspar, sodium sulfate, and cobalt oxide.

[0058] The beneficial effects that can be achieved by the present invention are:

[0059] The present invention uses cobalt oxide as a colorant for coloring. During the firing process, it is not affected by the oxidizing atmosphere or reducing atmosphere of the kiln. In the case of adding a small amount of cobalt oxide, the glass can be colored and a good coloring effect can be obtained. For example, adding 0.001% of cobalt oxide to the raw material can make the glass obtain a good coloring effect, showing a sky blue color, saving the cost of raw materials. Moreover, adding a small amount of colorant can also ensure the transmittance of the glass, making the glass suitable for the field of thin-film perovskite batteries. Further, the present invention can also reasonably use the measurement of the angle of the vector at the center of the CIELab color space. The chromaticity of the glass can be adjusted at will within the range of 0.001% to 0.0045% of the cobalt oxide content, so that the glass can obtain sky blue with different chromaticities to meet the needs of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0061] Figure 1 The present invention is a schematic diagram of the preparation process of sky blue glass.

[0062] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0063] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] In the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0066] The present invention provides a sky blue glass, which comprises the following components calculated by weight percentage:

[0067] SiO2: 65.7%~67.8%,

[0068] Al2O3: 1.42%~3.42%,

[0069] CaO: 9.5%~10.7%,

[0070] MgO: 0%~1.5%,

[0071] Na2O: 12.1%~14.3%,

[0072] K2O: 0%~2.2%,

[0073] SO3: 0.02%~0.18%,

[0074] Fe2O3: ≤0.014%,

[0075] CoO: 0.001%~0.0045%,

[0076] PbO: 5%~7%.

[0077] In some embodiments, the sky blue glass comprises the following components calculated by weight percentage:

[0078] SiO2: 66.7%,

[0079] Al2O3: 2.6%,

[0080] CaO: 10.5%,

[0081] MgO: 0.767%,

[0082] Na2O: 12.1%,

[0083] K2O: 2.2%,

[0084] SO3: 0.1%,

[0085] Fe2O3: 0.012%,

[0086] CoO: 0.0010%,

[0087] PbO: 5.02%;

[0088] Or, calculated by weight percentage, the sky blue glass includes the following components:

[0089] SiO2: 67%,

[0090] Al2O3: 2%,

[0091] CaO: 9.5%,

[0092] MgO: 1.2%,

[0093] Na2O: 12.3%,

[0094] K2O: 2%,

[0095] SO3: 0.024%,

[0096] Fe2O3: 0.014%,

[0097] CoO: 0.002%,

[0098] PbO: 5.96%;

[0099] Or, calculated by weight percentage, the sky blue glass includes the following components:

[0100] SiO2: 66%,

[0101] Al2O3: 1.8%,

[0102] CaO: 10.7%,

[0103] MgO: 1.5%,

[0104] Na2O: 12.3%,

[0105] K2O: 2.1%,

[0106] SO3: 0.088%,

[0107] Fe2O3: 0.008%,

[0108] CoO: 0.004%,

[0109] PbO: 5.5%.

[0110] CoO is a gray-black powder, but when added to glass as a colorant, it can appear blue, which is related to its chemical state and physical environment in the glass. In the glass grid, CoO can form a complex, in which Co 2+ Surrounded by oxygen ions in the glass grid, Co 2+ The d orbital of the glass is split in the crystal field, resulting in an energy level difference. The transition of electrons between these energy levels leads to a strong absorption of certain wavelengths of visible light, thus showing a complementary blue color. However, in the relevant technology, it is usually necessary to add a high content of CoO of 1.2% to 1.8% to make the glass obtain a better coloring effect and show a blue color. Adding a small amount of CoO is difficult to make the glass show a stable blue color.

[0111] In the present invention, the content of CoO is only 0.001% to 0.0045%, and can be any value in the range of 0.001%, 0.002%, 0.003%, 0.004%, 0.0041%, 0.0042%, 0.0045%, etc. In the related art, it is usually necessary to add 1.2% to 1.8% of high content CoO to make the glass obtain a better coloring effect and make it appear blue. However, by adjusting the raw material ratio in the glass, the present invention only needs to add 0.001% to 0.0045% of CoO to make the glass obtain a better coloring effect and make the glass appear sky blue. Not only does it save raw materials, but also because the amount of colorant added is small, the glass has a better transparent effect and can meet a transmittance of more than 91.6%, which is suitable for the field of thin-film solar cells. In addition, the chromaticity of sky blue glass can be adjusted arbitrarily within the range of 0.001% to 0.0045% according to the angle measurement of the vector at the center of the CIELab color space to meet different needs. Furthermore, CoO can also be used as a network exogenous body or network modifier of glass to affect the structure of the glass network and improve the chemical stability and thermal stability of the glass.

[0112] SiO2 is a component constituting the glass skeleton. SiO2 forms an irregular continuous network structure with the structural unit of silicon-oxygen tetrahedron to form the glass skeleton. The content of SiO2 is 65.7% to 67.8%, and can be any value in the range of 65.7%, 66%, 66.7%, 67%, 67.8%, etc. In the present invention, the content of SiO2 is relatively low, and the melting temperature can be reduced to 1450°C to 1530°C, thereby extending the service life of the kiln.

[0113] Al2O3 has a tetrahedral structure in the glass and plays a role in repairing the network, which can improve the mechanical strength and other properties of the glass. The content of Al2O3 is 1.42% to 3.42%, and can be any value in the range of 1.42% to 3.42%, such as 1.42%, 1.5%, 2%, 2.5%, 2.6%, 2.8%, 3%, 3.2%, 3.42%, etc.

[0114] CaO can reduce the viscosity of glass liquid at high temperature, which is beneficial to the melting and clarification of glass. It can increase the viscosity of glass liquid at low temperature, which is beneficial to the rapid molding of glass. The content of CaO is 9.5% to 10.7%, which can be any value in the range of 9.5% to 10.7%, such as 9.5%, 9.9%, 10.0%, 10.1%, 10.2%, 10.3%, 10.4%, 10.5%, 10.7%.

[0115] MgO is a network intermediate oxide. Proper addition of magnesium oxide can reduce the high-temperature viscosity of glass, reduce the crystallization tendency of glass, and optimize the comprehensive performance of glass. The role of MgO is basically similar to that of CaO. It can be omitted, reducing one raw material and facilitating ingredient control. In some embodiments, the content of MgO is 0% to 1.5%. It can be omitted or added in an amount greater than 0% and less than or equal to 1.5%.

[0116] Na2O is a metal oxide that can form a surface compressive stress layer through ion exchange, improve the glass melting effect, promote the melting and mixing of various raw materials, and enhance the uniformity of glass coloring. In some embodiments, the content of Na2O is 12.1% to 14.3%, and can be any value in the range of 12.1% to 14.3%, such as 12.1%, 12.5%, 12.8%, 13.0%, 13.4%, 13.5%, 13.8%, 14.0%, 14.2%, etc., which can not only improve the glass melting effect, promote the melting of raw materials, and enhance the uniformity of glass coloring, but also promote the transformation of CoO from CoO6 to CoO4, making Co 2+ It exists in the form of tetra-coordinate (CoO4) and reduces the form of hexa-coordinate (CoO6), thereby stabilizing the coloring effect of CoO, making the glass appear more pure sky blue and reducing the appearance of blue-purple colors. In addition, the mechanical properties of the glass will not deteriorate due to excessive addition.

[0117] K2O can produce a mixed alkali effect with Na2O, improve the gloss of the glass, and reduce the precipitation of sodium ions on the surface of the glass, improve the weather resistance of the glass, and improve the light transmittance of the glass. In some embodiments, the content of K2O is 0% to 2.2%, and it can be added without addition, or 0.1%, 0.5%, 0.7%, 0.9%, 1.0%, 1.2%, 1.5%, 1.6%, 1.8%, 2.0%, 2.1%, 2.2%, etc., which are greater than 0% and less than or equal to 2.2%, can be added. Under the above addition amount range, the light transmittance of the glass can be improved, and it is not easy to cause the mechanical properties of the glass to deteriorate due to excessive addition.

[0118] The SO3 in the glass usually comes from the oxidative decomposition of the Glauber's salt in the auxiliary material, and Glauber's salt can be used as a clarifier for the glass. The content of SO3 in the glass can be controlled by controlling the amount of Glauber's salt added. In some embodiments, the content of SO3 in the glass is 0.02% to 0.18%, and can be any value in the range of 0.02%, 0.05%, 0.1%, 0.12%, 0.15%, 0.18%, etc., which can make the color of the glass uniform and improve the light transmittance of the glass, so as to achieve the purpose of meeting the coloring requirements by adding a small amount of CoO. In addition, the introduction of SO3 can also reduce the emission of sulfur-containing waste gas in the production process of the glass, reduce the damage of harmful and toxic gases to the environment, and achieve the purpose of green and environmentally friendly production.

[0119] As a harmful substance in glass, Fe2O3 is usually not introduced intentionally, but is a component naturally introduced into the raw materials, which can make the glass produce color. In order to make the glass produce a relatively pure sky blue color and meet the high transmittance required by photovoltaic glass, it is necessary to strictly control the content of Fe2O3 to ≤ 0.014%, which can be any value less than or equal to 0.14%, such as 0.14%, 0.12%, 0.11%, 0.010%, 0.09%, 0.05%, 0.04%, 0.01%. The sky blue glass of the present invention strictly controls the content of Fe2O3, which can not only ensure the melting heat permeability of the sky blue glass, but also enhance the strength of the glass, improve the quality of the glass, and improve the molding effect. Moreover, the lower the iron content in the glass, the closer the original glass is to white, which can increase the transparency of the glass, which is beneficial to the coloring of CoO, especially controlling the Fe2O3 content to ≤0.014%, so that CoO can appear sky blue even when added at 0.001% to 0.0045%. Even a small amount of CoO can make the glass appear sky blue.

[0120] As a network intermediate, PbO is generally a grid outer body, which has the advantages of high dispersion, high refraction, high resistance, high specific gravity, etc., and can absorb X-rays, has a good fluxing effect, can improve the solubility, dispersion and stability of CoO, thereby improving the uniformity and stability of coloring. In addition, PbO can be introduced through waste old-fashioned TV screen glass, which can greatly reduce production costs and solve the problem of recycling waste old-fashioned TV screen glass. In some embodiments, the content of PbO is 5% to 7%, which can be any value in the range of 5% to 7%, such as 5%, 5.2%, 5.5%, 6.0%, 6.5%, 7.0%, etc.

[0121] In some embodiments, Na2O, CoO and K2O satisfy the following relationship: 2.5≤(Na2O-K2O) / 1000 / CoO≤10. This formula can be understood as calculating the weight percentage, the difference between the content of Na2O and the content of K2O, divided by 1000, and then divided by the content of CoO. The result is between 2.5 and 10, which can be 2.5, 2.55, 5, 5.11, 6, 7, 8, 9, 9.9, 10, etc. In this embodiment, the combination of Na2O and K2O can produce a mixed alkali effect, which affects the light transmittance and mechanical properties of the glass, and the content of Na2O can affect the coloring stability of CoO. By controlling the relationship between the three to 2.5≤(Na2O-K2O) / 1000 / CoO≤11, the appropriate amount of Na2O and K2O is added, and the content relationship between Na2O and CoO is also controlled, thereby achieving the purpose of improving the coloring effect and stability of CoO and balancing the mechanical properties and light transmittance of the glass.

[0122] In the present invention, the amount of CoO added is relatively small. If the Co-O bond in CoO is unstable, discoloration and color change may occur easily, which may affect the color rendering effect of the glass. Therefore, in some embodiments, the sky blue glass further includes the following components, calculated by weight percentage: 0.02% to 0.05% of MnO2, for example, 0.02%, 0.03%, 0.04%, or 0.05%. Under the above weight percentage conditions, the Mn element can improve the stability of Co-O and prevent the glass from discoloring and color change, and can also reduce impurities in the glass and improve the transmittance of the glass without affecting the sky blue color of the glass due to excessive addition.

[0123] In some embodiments, the sky blue glass includes the following components, calculated by weight percentage:

[0124] SiO2: 66.7%,

[0125] Al2O3: 2.6%,

[0126] CaO: 10.5%,

[0127] MgO: 0.747%,

[0128] Na2O: 12.1%,

[0129] K2O: 2.2%,

[0130] SO3: 0.1%,

[0131] Fe2O3: 0.012%,

[0132] CoO: 0.0010%,

[0133] PbO: 5.02%;

[0134] MnO2: 0.02%.

[0135] The present invention also provides a method for preparing sky blue glass, referring to Figure 1 The preparation method includes the following steps: mixing glass raw materials, melting, clarifying, molding, and annealing to obtain the sky blue glass.

[0136] In some embodiments, in the melting step, the melting temperature is 1450°C to 1530°C, and the melting temperature is any value in the range of 1450°C to 1530°C, such as 1450°C, 1500°C, 1530°C, etc. The melting temperature of the melting process of the present invention is relatively low, which can extend the service life of the kiln. Moreover, under the above melting temperature conditions, various raw materials are easy to melt and mix, which can improve the dispersion effect of CoO in the system and make the coloring of the glass more uniform and stable.

[0137] In some embodiments, in the clarifying step, the clarifying temperature is 1490°C to 1510°C, and can be any value in the range of 1490°C to 1510°C, such as 1490°C, 1500°C, 1510°C, etc.

[0138] In some embodiments, in the molding step, the molding temperature is 930°C to 970°C, and can be any value within the range of 930°C to 970°C, such as 930°C, 940°C, 950°C, 960°C, 970°C, etc.

[0139] In some embodiments, in the annealing step, the annealing temperature is 540°C to 560°C, and can be any value in the range of 540°C to 560°C, such as 540°C, 550°C, or 560°C.

[0140] In the glass raw material mixing step, the glass raw materials are mixed according to the preset component composition of the glass. In some embodiments, the order of the materials is silica sand, soda ash, limestone, feldspar, sodium sulfate, and cobalt oxide, which is conducive to uniform mixing of various glass raw materials.

[0141] In some embodiments, in the glass raw material mixing step, various glass raw materials except cobalt oxide are stacked end to end on the belt, which can greatly improve the uniformity of the batch material.

[0142] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention, and are not used to limit the present invention.

[0143] Example 1 to Example 3

[0144] The method for preparing the sky blue glass of Examples 1 to 3 comprises the following steps:

[0145] S10, weighing glass raw materials according to the glass composition in Table 1 and mixing them evenly;

[0146] S20, placing the uniformly mixed glass raw materials in a kiln, and melting them at 1450° C. to 1530° C. to obtain molten glass;

[0147] S30, performing clarification treatment on the molten glass in step S20 at 1490° C. to 1510° C. to obtain clarified glass;

[0148] S40, flattening and molding the clarified glass in step S30 to obtain molded glass, wherein the molding temperature is 930° C. to 970° C.;

[0149] S50, annealing the formed glass in step S40 at a temperature of 540°C to 560°C to obtain sky blue glass.

[0150] Performance Testing

[0151] 1. Determine the L* value, a* value and b* value of glass.

[0152] 2. Measure the average light transmittance (%) of glass with a thickness of 380mm to 780mm.

[0153] 3. Sandpaper drop performance of the whole machine: measured by a mobile phone controlled drop tester. The specific test conditions are: 80-grit sandpaper, 195g total weight, 60cm base height, 10cm increment, 1 time per height until broken. The height of the last test is selected as the drop height.

[0154] Table 1

[0155] Example <![CDATA[SiO2]]> <![CDATA[Al2O3]]> CaO MgO <![CDATA[Na2O]]> <![CDATA[K2O]]> <![CDATA[SO3]]> <![CDATA[Fe2O3]]> CoO PbO <![CDATA[MnO2]]> Example 1 66.7 2.6 10.5 0.767 12.1 2.2 0.1 0.012 0.0010 5.02 0 Example 2 67 2 9.5 1.2 12.3 2 0.024 0.014 0.002 5.96 0 Example 3 66 1.8 10.7 1.5 12.3 2.1 0.088 0.008 0.004 5.5 0 Example 4 66.7 2.6 10.5 0.747 12.1 2.2 0.1 0.012 0.0010 5.02 0.02

[0156] Table 2

[0157]

[0158] It can be seen from the chromaticity data in Table 2 that the glasses prepared in Examples 1 to 4 exhibit a bright sky blue color.

[0159] From the light transmittance and ball drop height test results in Table 2, it can be seen that the glasses of Examples 1 to 4 have a light transmittance of more than 91.6%, and the ball drop heights are all above 160 cm. They have good light transmittance and mechanical properties, and can be used as photovoltaic glass in the field of thin-film perovskite batteries.

[0160] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sky blue glass, characterized in that: Calculated by weight percentage, the sky blue glass includes the following components: SiO2: 65.7%~67.8%, Al2O3: 1.42%~3.42%, CaO: 9.5%~10.7%, MgO: 0%~1.5%, Na2O: 12.1%~14.3%, K2O: 0%~2.2%, SO3: 0.02%~0.18%, Fe2O3: ≤0.014%, CoO: 0.001%~0.0045%, PbO: 5%~7%.

2. The sky blue glass according to claim 1, characterized in that: The Na2O, CoO and K2O satisfy the following relationship: 2.5≤(Na2O-K2O) / 1000 / CoO≤10.

3. The sky blue glass according to claim 1, characterized in that: Calculated by weight percentage, the sky blue glass includes the following components: SiO2: 66.7%, Al2O3: 2.6%, CaO: 10.5%, MgO: 0.767%, Na2O: 12.1%, K2O: 2.2%, SO3: 0.1%, Fe2O3: 0.012%, CoO: 0.0010%, PbO: 5.02%; Or, calculated by weight percentage, the sky blue glass includes the following components: SiO2: 67%, Al2O3: 2%, CaO: 9.5%, MgO: 1.2%, Na2O: 12.3%, K2O: 2%, SO3: 0.024%, Fe2O3: 0.014%, CoO: 0.002%, PbO: 5.96%; Or, calculated by weight percentage, the sky blue glass includes the following components: SiO2: 66%, Al2O3: 1.8%, CaO: 10.7%, MgO: 1.5%, Na2O: 12.3%, K2O: 2.1%, SO3: 0.088%, Fe2O3: 0.008%, CoO: 0.004%, PbO: 5.5%.

4. The sky blue glass according to claim 1, characterized in that: The color value L* of the sky blue glass ranges from 96.70 to 96.95, the color value a* ranges from 0.15 to 0.18, and the color value b* ranges from -0.24 to -0.50; And / or, the light transmittance of the sky blue glass is greater than or equal to 91.6%.

5. A method for preparing the sky blue glass according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: mixing glass raw materials, melting, clarifying, molding and annealing to obtain the sky blue glass.

6. The method for preparing sky blue glass according to claim 5, characterized in that: In the melting step, the melting temperature is 1450°C to 1530°C.

7. The method for preparing sky blue glass according to claim 5, characterized in that: In the clarification step, the clarification temperature is 1490°C to 1510°C.

8. The method for preparing sky blue glass according to claim 5, characterized in that: In the molding step, the molding temperature is 930°C to 970°C.

9. The method for preparing sky blue glass according to claim 5, characterized in that: In the annealing step, the annealing temperature is 540°C to 560°C.

10. The method for preparing sky blue glass according to claim 5, characterized in that: In the glass raw material mixing step, the order of materials is silica sand, soda ash, limestone, feldspar, sodium sulfate, and cobalt oxide.

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