Gray glass compositions and vehicle glazing

Abstract

The present application relates to a kind of gray glass composition and car window glass.The above-mentioned gray glass composition includes base component and coloring component, and the mass percentage of coloring component in gray glass composition is as follows: total iron Fe2O3 1.3%~2.5%, titanium dioxide TiO2 100ppm~800ppm, chromium trioxide Cr2O3 100ppm~500ppm, cobalt oxide CoO 100ppm~400ppm, selenium Se 10ppm~50ppm and tin oxide SnO2 10ppm~50ppm.The above-mentioned gray glass composition has the comprehensive performance of low visible light transmittance, low infrared transmittance, low ultraviolet transmittance, low solar direct transmittance, and also has the neutral gray tone that satisfies visual comfort, also has great economic advantage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of glass, in particular to a gray glass composition and a vehicle window glass comprising a glass sheet prepared from the gray glass composition. BACKGROUND

[0002] With the further demand for heat insulation, ultraviolet rays insulation and personal privacy protection, more and more body-colored glass, such as gray glass, green glass, etc., are installed on vehicles. Among them, when using the gray glass, in addition to considering its optical performance, such as visible light transmittance, infrared transmittance and ultraviolet transmittance, etc., its color tone and appearance are also considered. The composition of the glass itself, the selection of the colorant and its proportioning will all affect the optical performance and color tone of the glass. How to ensure low visible light transmittance, improve privacy, reduce ultraviolet transmittance and infrared transmittance, and obtain a visually comfortable gray color tone is a problem that researchers need to solve. SUMMARY

[0003] Therefore, it is necessary to provide a gray glass composition which can ensure privacy, reduce ultraviolet transmittance and infrared transmittance, and obtain a visually comfortable gray color tone.

[0004] In addition, it is also necessary to provide a vehicle window glass comprising at least one glass sheet prepared from the gray glass composition.

[0005] The present application provides a gray glass composition comprising a base component and a coloring component, and the mass percentage of the coloring component in the gray glass composition is as follows:

[0006]

[0007] In some embodiments, the mass percentage of the titanium dioxide TiO2 in the gray glass composition is 200 ppm to 700 ppm; and / or,

[0008] The mass percentage of the tin oxide SnO2 in the gray glass composition is 20 ppm to 50 ppm.

[0009] In some embodiments, the mass percentage of the titanium dioxide TiO2 in the gray glass composition is 250 ppm to 500 ppm; and / or,

[0010] The mass percentage of the tin oxide SnO2 in the gray glass composition is 25 ppm to 45 ppm.

[0011] In some embodiments, the total iron Fe2O3 contains FeO in a mass percentage of 20% to 40% of the total iron Fe2O3.

[0012] In some embodiments, the coloring component satisfies at least one of the following conditions:

[0013] (1) the mass ratio of the total iron Fe2O3 to the chromium trioxide Cr2O3 is (30-125): 1;

[0014] (2) the mass ratio of the cobalt oxide CoO to the selenium Se is (5-30): 1;

[0015] (3) the mass ratio of the chromium trioxide Cr2O3 to the selenium Se is (5-40): 1;

[0016] (4) the mass ratio of the total mass of the total iron Fe2O3, the chromium trioxide Cr2O3, and the cobalt oxide CoO to the selenium Se is (300-900): 1.

[0017] In some embodiments, the coloring component satisfies at least one of the following conditions:

[0018] (1) the mass ratio of the total iron Fe2O3 to the chromium trioxide Cr2O3 is (45-80): 1;

[0019] (2) the mass ratio of the cobalt oxide CoO to the selenium Se is (6-15): 1;

[0020] (3) the mass ratio of the chromium trioxide Cr2O3 to the selenium Se is (8-20): 1;

[0021] (4) the mass ratio of the total mass of the total iron Fe2O3, the chromium trioxide Cr2O3, and the cobalt oxide CoO to the selenium Se is (400-800): 1.

[0022] In some embodiments, the coloring component satisfies at least one of the following conditions:

[0023] (1) the mass ratio of the total iron Fe2O3 to the chromium trioxide Cr2O3 is (50-70): 1;

[0024] (2) the mass ratio of the cobalt oxide CoO to the selenium Se is (8-12): 1;

[0025] (3) the mass ratio of the chromium trioxide Cr2O3 to the selenium Se is (9-15): 1;

[0026] (4) the total mass of the total iron Fe2O3, the chromium trioxide Cr2O3 and the cobalt oxide CoO to the mass of the selenium is (500-700): 1.

[0027] In some embodiments, the glass has at least one of an ultraviolet transmittance of 1.2% or less, an infrared transmittance of 10% or less, a visible light transmittance of 10% or less, and a solar direct transmittance of 10% or less, based on a glass thickness of 5 mm.

[0028] In some embodiments, the glass has an ultraviolet transmittance of 0.7% or less, an infrared transmittance of 5% or less, a visible light transmittance of 8% or less, and a solar direct transmittance of 7% or less, based on a glass thickness of 5 mm.

[0029] In some embodiments, the glass has an RGB color pattern with an R value of 60-90, a G value of 70-90, and a B value of 55-85, based on a glass thickness of 5 mm.

[0030] In some embodiments, the RGB color pattern of the glass satisfies at least one of the following conditions, based on a glass thickness of 5 mm:

[0031] (1) an R value of 60-80, a G value of 70-85, and a B value of 60-80;

[0032] (2) R:G = 1:(1.05-1.25), R:B = 1:(1-1.2), and G:B = 1:(0.8-1.1).

[0033] In some embodiments, the RGB color pattern of the glass satisfies at least one of the following conditions, based on a glass thickness of 5 mm:

[0034] (1) an R value of 60-70, a G value of 70-80, and a B value of 65-75;

[0035] (2) R:G = 1:(1.1-1.2), R:B = 1:(1.05-1.15), and G:B = 1:(0.9-1).

[0036] In some embodiments, the mass percentage of the coloring components in the gray glass composition is as follows:

[0037]

[0038] In some embodiments, the mass percentage of the coloring components in the gray glass composition is as follows:

[0039]

[0040] In some embodiments, the mass percentage of the coloring components in the gray glass composition is as follows:

[0041] In some embodiments, the coloring component does not contain cerium dioxide CeO2.

[0042] In some embodiments, the mass percentage of total iron Fe2O3, titanium dioxide TiO2, chromium sesquioxide Cr2O3, cobalt oxide CoO, selenium Se, and tin oxide SnO2 satisfies: total iron Fe2O3+10*(titanium dioxide TiO2+chromium sesquioxide Cr2O3+cobalt oxide CoO+ selenium Se+tin oxide SnO2)=2.1%~3%, preferably 2.5%~2.8%.

[0043] The present application also provides a vehicle window glass, which comprises at least one glass sheet prepared from the grey glass composition, and the thickness of the glass sheet is 0.7mm~5mm, and the vehicle window glass is a sunroof glass, a side window glass, or a quarter window glass.

[0044] The grey glass composition and the vehicle window glass provided by the present application have at least the following beneficial effects:

[0045] The grey glass composition and the vehicle window glass provided by the present application have the comprehensive performance of low visible light transmittance, low infrared light transmittance, low ultraviolet light transmittance, and low solar direct transmittance, can well block the penetration of ultraviolet light to avoid the damage of ultraviolet light to the articles and personnel in the vehicle, can also achieve good heat insulation effect and privacy protection, and have the neutral grey color tone meeting the visual comfort, and have great economic advantages. DETAILED DESCRIPTION

[0046] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the specific embodiments. The preferred embodiments of the present application are given in the specific embodiments. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0048] Unless otherwise stated or contradictory, the terms or phrases used in the present application have the following meanings:

[0049] In the present application, "first", "second" are used only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0050] In the present application, "at least one" refers to any one, any two or more of the listed items.

[0051] In the present application, the percentage concentration involved refers to the final concentration, unless otherwise specified. The final concentration refers to the proportion of the added component in the system after the component is added.

[0052] In the present application, the words "preferably", "more preferably" and the like refer to embodiments of the present application that can provide certain advantages in certain situations. However, other embodiments can also be preferred in the same or other situations. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not useful, nor does it imply that these other embodiments are excluded from the scope of the present application.

[0053] When a numerical range is disclosed in the present application, the above range is considered to be continuous, and includes the minimum value and the maximum value of the range, and every value between the minimum value and the maximum value. Further, when the range refers to an integer, every integer between the minimum value and the maximum value of the range is included. In addition, when multiple ranges are provided to describe a feature or a characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed in the present application should be understood to include any and all sub-ranges subsumed therein.

[0054] The first aspect of the present application provides a grey glass composition of an embodiment, comprising a base component and a coloring component, the mass percentage of the coloring component in the grey glass composition is as follows:

[0055]

[0056] Specifically, the mass percentage of total iron Fe2O3 can be, but is not limited to, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5% or a range consisting of any two of these values. Preferably, the mass percentage of total iron Fe2O3 is 1.4% to 2.3%. Further, the mass percentage of total iron Fe2O3 is 1.4% to 2.0%. Still further, the mass percentage of total iron Fe2O3 is 1.5% to 1.9%. Still further, the mass percentage of total iron Fe2O3 is 1.5% to 1.8%.

[0057] In some embodiments, the total iron Fe2O3 has FeO content of 20% to 40% by mass of the total iron, i.e. the redox ratio (redox ratio = FeO / total iron Fe2O3) is 0.2 to 0.4. Alternatively, the redox ratio can be, but is not limited to, 0.2, 0.22, 0.24, 0.25, 0.26, 0.28, 0.3, 0.32, 0.34, 0.35, 0.36, 0.38, 0.4 or a range between any two of these values. Preferably, the redox ratio is 0.2 to 0.3.

[0058] In the present embodiment, iron (Fe) can be used to adjust the transmittance and color of the glass, and is usually present in the form of divalent iron (Fe 2+ ) and trivalent iron (Fe 3+ ) in the glass. The divalent iron (Fe 2+ ) can act as an infrared absorbing component and give the glass a more significant blue-green color, and the trivalent iron (Fe 3+ ) can act as an ultraviolet absorbing component and give the glass a light yellow color. It should be noted that the mass percentage of total iron is expressed as Fe2O3, which is a common representation in the art and does not mean that all the iron in the gray glass composition is Fe2O3. If the FeO content in the total iron is too low, it indicates that the oxygen supply during the melting process is too much, which can increase the possibility of Se existing in the form of SeO2, and weaken the coloring ability of Se. If the FeO content in the total iron is too high, it indicates that the oxygen supply during the melting process is too low, and it is difficult to ensure that there is enough Se left in the glass composition. In addition, an increase in the content of divalent iron (Fe 2+ ) can easily cause problems such as a decrease in thermal conductivity during the melting process. Therefore, in the present embodiment, preferably, the total iron has FeO content of 20% to 40% by mass of the total iron.

[0059] In some embodiments, the mass percentage of titanium dioxide TiO2 in the gray glass composition can be, but is not limited to, 100 ppm, 120 ppm, 150 ppm, 180 ppm, 200 ppm, 220 ppm, 250 ppm, 280 ppm, 300 ppm, 320 ppm, 350 ppm, 380 ppm, 400 ppm, 420 ppm, 450 ppm, 480 ppm, 500 ppm, 520 ppm, 550 ppm, 580 ppm, 600 ppm, 620 ppm, 650 ppm, 680 ppm, 700 ppm, 720 ppm, 750 ppm, 780 ppm, 800 ppm, or a range between any two of these values. Preferably, the mass percentage of titanium dioxide TiO2 is 200 ppm to 700 ppm. More preferably, the mass percentage of titanium dioxide TiO2 is 200 ppm to 600 ppm. More preferably, the mass percentage of titanium dioxide TiO2 is 250 ppm to 500 ppm. Titanium dioxide TiO2 can act as an ultraviolet light absorbing component and give the glass a yellow color, and if added in excess, the glass will be yellowish and cannot obtain a visually comfortable neutral gray color tone. Cerium dioxide CeO2, which is a rare earth element, also has a similar effect as titanium dioxide TiO2, but is more expensive and difficult to mix uniformly in large quantities. Preferably, the coloring component does not contain cerium dioxide CeO2. The present application uses a lower content of titanium dioxide TiO2 and does not use cerium dioxide CeO2, and still obtains a gray glass with excellent optical performance and glass color tone. Compared with other prior art that uses a high content of titanium dioxide TiO2 and cerium dioxide CeO2, the present application has a great economic advantage, which is completely unexpected.

[0060] In the present embodiment, chromium sesquioxide Cr2O3 can act as an ultraviolet light absorbing component and yellow-green or dark green coloring component. Through yellow-green or dark green coloring, the visible light transmittance (Lta) of the float glass can be reduced to meet the demand for privacy protection, and the fatigue of the human eye can be reduced, which is more easily coordinated with the driving environment. Therefore, in the present embodiment, the mass percentage of chromium sesquioxide Cr2O3 is 100 ppm to 500 ppm.

[0061] In some embodiments, the mass percentage of chromium trioxide can be, but not limited to, 100 ppm, 150 ppm, 200 ppm, 220 ppm, 240 ppm, 250 ppm, 260 ppm, 280 ppm, 300 ppm, 320 ppm, 340 ppm, 350 ppm, 360 ppm, 380 ppm, 400 ppm, or a range between any two of these values. Preferably, the mass percentage of chromium trioxide is 200 ppm to 400 ppm. More preferably, the mass percentage of chromium trioxide is 200 ppm to 350 ppm. More preferably, the mass percentage of chromium trioxide is 250 ppm to 350 ppm.

[0062] In some embodiments, the mass ratio of total iron Fe2O3 to chromium trioxide (Fe2O3 / Cr2O3) is (30-125): 1. For example, the mass ratio of total iron to chromium trioxide can be, but not limited to, 30: 1, 35: 1, 40: 1, 45: 1, 50: 1, 55: 1, 60: 1, 65: 1, 70: 1, 75: 1, 80: 1, 85: 1, 90: 1, 95: 1, 100: 1, 105: 1, 110: 1, 115: 1, 120: 1, 125: 1, or a range between any two of these values. Preferably, the mass ratio of total iron to chromium trioxide is (45-80): 1. More preferably, the mass ratio of total iron to chromium trioxide is (50-70): 1. More preferably, the mass ratio of total iron to chromium trioxide is (55-65): 1.

[0063] Cobalt is a very stable and strong blue colorant, which can reduce the light transmittance. Blue color combined with green color forms a certain brightness of cyan color, which can be deep or light. In some embodiments, the mass percentage of cobalt oxide CoO can be, but not limited to, 100 ppm, 120 ppm, 150 ppm, 180 ppm, 200 ppm, 220 ppm, 240 ppm, 250 ppm, 260 ppm, 280 ppm, 300 ppm, 320 ppm, 340 ppm, 350 ppm, 360 ppm, 380 ppm, 400 ppm, or a range between any two of these values. Further, the mass percentage of cobalt oxide CoO is 150 ppm to 400 ppm. Further, the mass percentage of cobalt oxide is 200 ppm to 350 ppm. Further, the mass percentage of cobalt oxide is 200 ppm to 300 ppm.

[0064] In some embodiments, the mass percentage of selenium can be, but not limited to, 10 ppm, 12 ppm, 14 ppm, 15 ppm, 16 ppm, 18 ppm, 20 ppm, 22 ppm, 24 ppm, 25 ppm, 26 ppm, 28 ppm, 30 ppm, 32 ppm, 34 ppm, 35 ppm, 36 ppm, 38 ppm, 40 ppm, 42 ppm, 44 ppm, 45 ppm, 46 ppm, 48 ppm, 50 ppm, or a range between any two of these values. Preferably, the mass percentage of selenium is 20 ppm to 50 ppm. More preferably, the mass percentage of selenium is 20 ppm to 40 ppm.

[0065] In the present embodiment, cobalt oxide (CoO) and selenium (Se) are added into the grey glass composition at the same time, cobalt oxide (CoO) can be used as a blue coloring component, and selenium (Se) can be used as a red, pink coloring component. If the content of cobalt oxide (CoO) is too high, it will cause strong blue coloring, and if the content of selenium (Se) is too high, it will cause strong red coloring. Moreover, the oxide of selenium has strong volatility during the glass melting process, and requires expensive decontamination equipment. In order to obtain a neutral grey glass without color deviation and with great economic advantage, in the present embodiment, the mass ratio of cobalt oxide (CoO) to selenium (Se) (CoO / Se) is (5-30):1. For example, the mass ratio of cobalt oxide to selenium can be, but not limited to, 5:1, 6:1, 8:1, 10:1, 12:1, 14:1, 15:1, 16:1, 18:1, 20:1, 22:1, 24:1, 25:1, 26:1, 28:1, 30:1, or a range between any two of these values. Further preferably, the mass ratio of cobalt oxide to selenium is (6-20):1. More further, the mass ratio of cobalt oxide to selenium is (6-15):1. More further, the mass ratio of cobalt oxide to selenium is (8-12):1.

[0066] In some embodiments, the mass ratio of chromium sesquioxide to selenium (Cr2O3 / Se) is (5-40):1. For example, the mass ratio of chromium sesquioxide to selenium can be, but not limited to, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 12:1, 15:1, 18:1, 20:1, 22:1, 25:1, 28:1, 30:1, 32:1, 35:1, 38:1, 40:1, or a range between any two of these values. In order to obtain a neutral grey glass without color deviation and with great economic advantage, preferably, the mass ratio of chromium sesquioxide to selenium is (6-30):1. Preferably, the mass ratio of chromium sesquioxide to selenium is (8-20):1. Preferably, the mass ratio of chromium sesquioxide to selenium is (9-15):1.

[0067] In some embodiments, the total mass of iron, chromium oxide and cobalt oxide to the mass of selenium ((Fe203+ Cr203+ CoO) / Se) is (300-900): 1. For example, the total mass of iron, chromium oxide and cobalt oxide to the mass of selenium can be, but is not limited to, 300: 1, 320: 1, 350: 1, 380: 1, 400: 1, 420: 1, 450: 1, 480: 1, 500: 1, 520: 1, 550: 1, 580: 1, 600: 1, 620: 1, 650: 1, 680: 1, 700: 1, 720: 1, 750: 1, 780: 1, 800: 1, 820: 1, 850: 1, 880: 1, 900: 1, or a range defined by any two of these values. To obtain a neutral gray glass without color bias, and with great economic advantage, further, the total mass of iron, chromium oxide and cobalt oxide to the mass of selenium is (400-800): 1. Further, the total mass of iron, chromium oxide and cobalt oxide to the mass of selenium is (500-700): 1.

[0068] In some embodiments, the mass percentage of tin oxide can be, but is not limited to, 10 ppm, 12 ppm, 14 ppm, 15 ppm, 16 ppm, 18 ppm, 20 ppm, 22 ppm, 24 ppm, 25 ppm, 26 ppm, 28 ppm, 30 ppm, 32 ppm, 34 ppm, 35 ppm, 36 ppm, 38 ppm, 40 ppm, 42 ppm, 44 ppm, 45 ppm, 46 ppm, 48 ppm, 50 ppm, or a range defined by any two of these values.

[0069] In the present embodiment, the addition of a certain amount of tin oxide (Sn02) in the gray glass composition can remove gaseous inclusions contained in the glass bath during glass melting and increase the redox ratio, thereby reducing the infrared transmittance, but on the other hand, also gives the glass a yellow color. To obtain a neutral gray glass without color bias, further, the mass percentage of tin oxide is 20 ppm-50 ppm. Further, the mass percentage of tin oxide is 25 ppm-45 ppm. Further, the mass percentage of tin oxide is 25 ppm-40 ppm.

[0070] The grey glass composition of the present application employs a float process to manufacture a grey glass, by adjusting the mass percentage of total iron Fe2O3, titanium dioxide TiO2, chromium trioxide Cr2O3, cobalt oxide CoO, selenium Se and tin oxide SnO2 in the coloring component, ultimately obtaining a grey glass with low visible light transmittance (Lta), low infrared transmittance (Tir), low ultraviolet transmittance (Tuv), low solar direct transmittance (Te) and a neutral grey tone that satisfies visual comfort. In order to have great economic advantages, the mass percentage of total iron Fe2O3, titanium dioxide TiO2, chromium trioxide Cr2O3, cobalt oxide CoO, selenium Se and tin oxide SnO2 satisfies: total iron + 10*(titanium dioxide + chromium trioxide + cobalt oxide + selenium + tin oxide) = 2.1%~3%, for example, but not limited to, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0% or a range consisting of any two of these values. Further, the mass percentage of total iron Fe2O3, titanium dioxide TiO2, chromium trioxide Cr2O3, cobalt oxide CoO, selenium Se and the tin oxide SnO2 satisfies: total iron + 10*(titanium dioxide + chromium trioxide + cobalt oxide + selenium + tin oxide) = 2.5%~2.8%.

[0071] In some embodiments, the mass percentage of the coloring component in the grey glass composition is as follows:

[0072]

[0073]

[0074] Further, the mass percentage of the coloring component in the grey glass composition is as follows:

[0075]

[0076] In some embodiments, the ultraviolet transmittance (Tuv) is 1.2% or less, for example, but not limited to, 1.2%, 1.1%, 1.0%, 0.9%, 0.85%, 0.8%, 0.75%, 0.7%, 0.65%, 0.6%, 0.55% or a range consisting of any two of these values, based on a glass thickness of 5mm. Preferably, the ultraviolet transmittance is ≤0.9%. Preferably, the ultraviolet transmittance is ≤0.8%, more preferably, the ultraviolet transmittance is ≤0.7%.

[0077] In some embodiments, the glass has an infrared transmittance (Tir) of 10% or less based on a glass thickness of 5 mm. Preferably, the infrared transmittance is 9% or less. Further preferably, the infrared transmittance is 8% or less. Further preferably, the infrared transmittance is 7% or less. Further preferably, the infrared transmittance is 6% or less. Further preferably, the infrared transmittance is 5% or less.

[0078] In some embodiments, the glass has a solar direct transmittance (Te) of 10% or less based on a glass thickness of 5 mm. Preferably, the solar direct transmittance is 9% or less. Further preferably, the solar direct transmittance is 8% or less. Further preferably, the solar direct transmittance is 7% or less.

[0079] In some embodiments, the glass has a visible light transmittance (Lta) of 10% or less based on a glass thickness of 5 mm. Preferably, the visible light transmittance is 9% or less. Further preferably, the visible light transmittance is 8% or less. Further preferably, the visible light transmittance is 7% or less.

[0080] In some embodiments, the glass has an ultraviolet transmittance of 1.2% or less, an infrared transmittance of 10% or less, a solar direct transmittance of 10% or less, and a visible light transmittance of 10% or less based on a glass thickness of 5 mm. Further, the glass has an ultraviolet transmittance of 0.8% or less, an infrared transmittance of 8% or less, a solar direct transmittance of 8% or less, and a visible light transmittance of 9% or less based on a glass thickness of 5 mm. Further, the glass has an ultraviolet transmittance of 0.7% or less, an infrared transmittance of 5% or less, a solar direct transmittance of 7% or less, and a visible light transmittance of 8% or less based on a glass thickness of 5 mm.

[0081] The grey glass made from the above grey glass composition has low visible light transmittance (Lta), low infrared transmittance (Tir), low ultraviolet transmittance (Tuv), and low solar direct transmittance (Te), which can well block the penetration of ultraviolet rays to avoid damage to the articles and personnel in the vehicle, and also can achieve good heat insulation effect and privacy protection, and has good energy-saving and environmental protection effect.

[0082] In some embodiments, the grey glass made from the above grey glass composition has RGB color mode: R value is 60-90, G value is 70-90, and B value is 55-85, based on a glass thickness of 5mm. The R value can be, but is not limited to, 60, 62, 65, 68, 70, 72, 75, 78, 80, 82, 85, 88, 90, or a range between any two of these values. The G value can be, but is not limited to, 70, 72, 75, 78, 80, 82, 85, 88, 90, or a range between any two of these values. The B value can be, but is not limited to, 55, 58, 60, 62, 65, 68, 70, 72, 75, 78, 80, 82, 85, or a range between any two of these values. By adjusting the R, G, and B values, a grey glass with a neutral grey tone that is visually comfortable, such as a dark blue-grey color, can be obtained, which is more aesthetically pleasing and comfortable to the human eye.

[0083] Optionally, the R value is 60-80, the G value is 70-85, and the B value is 60-80. Optionally, the R value is 60-70, the G value is 70-80, and the B value is 65-75.

[0084] Further, R:G = 1:(1.05-1.25); further, R:G = 1:(1.1-1.2); further, R:G = 1:(1.14-1.16).

[0085] Further, R:B = 1:(1-1.2); further, R:B = 1:(1.05-1.15); further, R:B = 1:(1.06-1.1).

[0086] Further, G:B = 1:(0.8-1.1); further, G:B = 1:(0.9-1); further, G:B = 1:(0.93-0.95).

[0087] In some embodiments, the base component of the grey glass composition can be a component commonly used in the art, such as a soda-lime-silica float glass. The mass percentage of the base component in the grey glass composition is as follows:

[0088]

[0089]

[0090] Na2O can reduce the high temperature viscosity of the glass, reduce the structural change threshold of the coloring component, and improve the thermal expansion coefficient of the glass; K2O and Na2O belong to alkali metal oxides, and their effects are similar to Na2O; if the content of Na2O and K2O is too high, the chemical stability of the glass decreases; CaO can improve the stability and anti-crystallization performance of the glass, and reduce the high temperature viscosity of the glass; MgO can improve the chemical stability of the glass, and if the content is too high, the anti-crystallization performance of the glass decreases; Al2O3 can also improve the chemical stability of the glass.

[0091] The gray glass composition described in the application can be applied to the conventional float glass production process. In the float glass production process, due to some impurities brought by the glass raw materials and production equipment, the final glass product contains uncontrollable trace components. Since the content is very small and does not affect the performance of the glass, the application does not make specific description.

[0092] The application also provides a vehicle window glass, which comprises at least one glass sheet prepared from the above-mentioned gray glass composition, and the thickness of the glass sheet is 0.7mm-5mm. The vehicle window glass is a sunroof glass, a side window glass or a quarter window glass. It can be understood that the gray glass prepared from the gray glass composition described in the application can also be used as architectural glass, aviation glass and the like.

[0093] Embodiment

[0094] In the following comparative examples and embodiments, silica sand, soda ash, sodium nitrate, mirabilite, dolomite, limestone, iron powder, carbon powder, titanium dioxide, chromite, cobalt and selenium are used as raw materials to prepare the gray glass composition.

[0095] The preparation steps are as follows: the melting furnace is heated to 1500℃ and maintained for 30 minutes to reduce the excessive volatilization of selenium oxide during the heating process, then the mixed raw materials according to the composition of the glass in the embodiment are prepared, 4%-10% of water based on the mass percentage of the gray glass composition is appropriately added, and then the mixed raw materials are put into the crucible after being uniformly mixed, the melting temperature of 1500℃ is maintained for 2.5-3.5 hours, then the molten glass liquid is poured out of the crucible, the glass liquid flows into a specially designed steel plate for shaping, and the shaped glass is gradually annealed in an annealing furnace, and then the glass is cut and polished after cooling and annealing to obtain the glass sample.

[0096] The mass percentage of the base components in the gray glass composition of Comparative Example 1 and Examples 1-7 is as follows:

[0097]

[0098] Specifically, the base components of Comparative Example 1 and Examples 1-7 are shown in Table 1.

[0099] Table 1 : Base components of the grey glass compositions

[0100] SiO2 Na2O CaO MgO Al2O3 K2O Comparative Example 1 72.08％ 13.85％ 8.98％ 3.4％ 0.35％ 0.05％ Example 1 72.05％ 13.8％ 8.96％ 3.4％ 0.33％ 0.06％ Example 2 71.95％ 13.84％ 8.99％ 3.4％ 0.34％ 0.05％ Example 3 71.79％ 13.79％ 8.98％ 3.4％ 0.35％ 0.05％ Example 4 71.54％ 13.88％ 8.99％ 3.4％ 0.33％ 0.06％ Example 5 71.54％ 13.8％ 9.01％ 3.4％ 0.35％ 0.05％ Example 6 71.52％ 13.85％ 9.01％ 3.4％ 0.34％ 0.05％ Example 7 71.45％ 13.85％ 9.02％ 3.4％ 0.36％ 0.05％

[0101] The coloring components of the grey glass compositions of Comparative Example 1 and Examples 1 to 7 (in mass percent) are shown in Table 2.

[0102] Table 2: Coloring components of the grey glass compositions of Comparative Example 1 and Examples 1 to 7

[0103]

[0104]

[0105] The glass samples prepared in Comparative Example 1 and Examples 1 to 7 were analyzed with a glass thickness of 5 mm, and the results are shown in Table 3. The solar direct transmittance (Te), the infrared transmittance (Tir), the ultraviolet transmittance (Tuv), the ultraviolet transmittance (Tuv) and the RGB color mode in Table 3 were measured according to the following methods:

[0106] Solar direct transmittance (Te): measured according to ISO 9050:2003 in the wavelength range from 300 nm to 2500 nm;

[0107] Infrared transmittance (Tir): measured according to ISO 9050:2003 in the wavelength range from 780 nm to 2500 nm;

[0108] Visible light transmittance (Lta): measured according to ISO 9050:2003 in the wavelength range from 380 nm to 780 nm;

[0109] Ultraviolet transmittance (Tuv): measured according to ISO 9050:2003 in the wavelength range from 300 nm to 380 nm;

[0110] RGB color mode: measured and converted according to the standard of CIE 1976, D65 illuminant.

[0111] Table 3: Optical properties and color of the glass samples of Comparative Example 1 and Examples 1 to 7

[0112] Lta Tuv Te Tir R G B Comparative Example 1 11.64％ 2.35％ 12.71％ 11.73％ 93.87 96.13 89.53 Example 1 8.31％ 1.16％ 8.71％ 7.29％ 76.83 83.29 78.24 Example 2 8.32％ 1.12％ 8.58％ 7.09％ 76.74 83.42 77.67 Example 3 6.93％ 0.63％ 6.50％ 4.74％ 67.39 77.67 72.14 Example 4 7.02％ 0.67％ 6.61％ 4.82％ 67.88 78.17 73.20 Example 5 6.88％ 0.67％ 6.45％ 4.61％ 66.71 77.62 73.45 Example 6 6.42％ 0.60％ 6.18％ 4.55％ 65.15 74.58 69.74 Example 7 6.29％ 0.57％ 6.08％ 4.51％ 64.63 73.76 68.56

[0113] As can be seen from Table 3 above, the total iron content in the grey glass composition of Comparative Example 1 is <1.3% and the total iron + 10*(titanium dioxide + chromium sesquioxide + cobalt oxide + selenium + tin oxide) is <2.1%, so that the glass obtained in Comparative Example 1 has a solar direct transmittance (Te) of more than 10%, an infrared transmittance (Tir) of more than 10%, a visible light transmittance (Lta) of more than 10% and an ultraviolet transmittance (Tuv) of more than 2% based on a glass thickness of 5 mm, and the R value in the RGB color mode is more than 90, the G value is more than 95 and the B value is more than 85.

[0114] Compared with Comparative Example 1, the glass obtained in Example 1 and Example 2 has a solar direct transmittance (Te) of 9% or less, an infrared transmittance (Tir) of 8% or less, a visible light transmittance (Lta) of 9% or less and an ultraviolet transmittance (Tuv) of 1.2% or less based on a glass thickness of 5 mm, and the R value in the RGB color mode is 70-80, the G value is 80-85 and the B value is 70-80, which can well block the penetration of ultraviolet rays to avoid damage to the articles and personnel in the vehicle, and can also achieve good heat insulation effect and privacy protection, meet the neutral grey color tone for visual comfort, and have good energy-saving and environmental protection effect.

[0115] Compared with Comparative Example 1, the glass obtained in Examples 3-7 has a solar direct transmittance (Te) of 7% or less, an infrared transmittance (Tir) of 5% or less, a visible light transmittance (Lta) of 8% or less, even 7% or less, and an ultraviolet transmittance (Tuv) of 0.7% or less based on a glass thickness of 5 mm, and the R value in the RGB color mode is 60-70, the G value is 70-80 and the B value is 65-75, which can very well block the penetration of ultraviolet rays to avoid damage to the articles and personnel in the vehicle, and can also achieve good heat insulation effect and privacy protection, meet the neutral grey color tone for visual comfort, and have good energy-saving and environmental protection effect.

[0116] The technical features of the above-described examples can be combined in any manner. For the sake of brevity, not all possible combinations are described, and it is understood that the scope of the present specification includes all possible combinations.

[0117] The above-mentioned embodiments only express several implementation manners of the present application, facilitate concrete and detailed understanding of the technical solutions of the present application, but cannot be understood as a limitation on the patent protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. It should be understood that, on the basis of the technical solutions provided by the present application, the technical solutions obtained by logical analysis, reasoning or limited experiments by the skilled person in the art all belong to the protection scope of the appended claims of the present application. Therefore, the protection scope of the present application patent should be subject to the content of the appended claims, and the description can be used to explain the content of the claims.

Claims

1. A gray glass composition, characterized in that, The composition includes a base component and a coloring component, wherein the coloring component comprises the following mass percentages in the gray glass composition: Based on a glass thickness of 5mm, the glass has an RGB color mode: R value 60-90, G value 70-90, B value 55-85; Based on a glass thickness of 5mm, the glass has an infrared transmittance of less than 10%. R:G=1:(1.05~1.25), R:B=1:(1~1.2), G:B=1:(0.8~1.1); The mass ratio of chromium trioxide (Cr2O3) to selenium (Se) is (8-20):1; The mass percentages of total iron (Fe2O3), titanium dioxide (TiO2), chromium trioxide (Cr2O3), cobalt oxide (CoO), selenium (Se), and tin oxide (SnO2) satisfy the following: total iron (Fe2O3) + 10 * (titanium dioxide (TiO2) + chromium trioxide (Cr2O3) + cobalt oxide (CoO) + selenium (Se) + tin oxide (SnO2) = 2.1% to 3%.

2. The gray glass composition according to claim 1, characterized in that, In the gray glass composition, the mass percentage of titanium dioxide (TiO2) is 200 ppm to 700 ppm; and / or, In the gray glass composition, the mass percentage of tin oxide (SnO2) is 20 ppm to 50 ppm.

3. The gray glass composition according to claim 2, characterized in that, In the gray glass composition, the mass percentage of titanium dioxide (TiO2) is 250 ppm to 500 ppm; and / or, In the gray glass composition, the mass percentage of tin oxide (SnO2) is 25 ppm to 45 ppm.

4. The gray glass composition according to claim 1, characterized in that, The total iron Fe2O3 contains FeO accounting for 20% to 40% of the total iron Fe2O3 by mass.

5. The gray glass composition according to claim 1, characterized in that, The coloring component satisfies at least one of the following conditions: (1) The mass ratio of total iron Fe2O3 to chromium trioxide Cr2O3 is (30-125):1; (2) The mass ratio of cobalt oxide (CoO) to selenium (Se) is (5-30):1; (3) The total mass ratio of the total iron Fe2O3, the chromium trioxide Cr2O3 and the cobalt oxide CoO to the mass ratio of the selenium is (300-900):

1.

6. The gray glass composition according to claim 5, characterized in that, The coloring component satisfies at least one of the following conditions: (1) The mass ratio of total iron Fe2O3 to chromium trioxide Cr2O3 is (45-80):1; (2) The mass ratio of cobalt oxide (CoO) to selenium (Se) is (6-15):1; (3) The total mass ratio of the total iron Fe2O3, the chromium trioxide Cr2O3 and the cobalt oxide CoO to the mass ratio of the selenium is (400-800):

1.

7. The gray glass composition according to claim 6, characterized in that, The coloring component satisfies at least one of the following conditions: (1) The mass ratio of total iron Fe2O3 to chromium trioxide Cr2O3 is (50-70):1; (2) The mass ratio of cobalt oxide (CoO) to selenium (Se) is (8-12):1; (3) The mass ratio of chromium trioxide (Cr2O3) to selenium (Se) is (9-15):1; (4) The total mass ratio of the total iron Fe2O3, the chromium trioxide Cr2O3 and the cobalt oxide CoO to the mass ratio of the selenium is (500-700):

1.

8. The gray glass composition according to any one of claims 1 to 7, characterized in that, Based on a glass thickness of 5 mm, the glass has at least one of the following: ultraviolet transmittance of less than 1.2%, visible light transmittance of less than 10%, and direct solar transmittance of less than 10%.

9. The gray glass composition according to claim 8, characterized in that, Based on a glass thickness of 5mm, the glass has an ultraviolet transmittance of less than 0.7%, an infrared transmittance of less than 5%, a visible light transmittance of less than 8%, and a direct solar energy transmittance of less than 7%.

10. The gray glass composition according to any one of claims 1 to 7, characterized in that, Based on a glass thickness of 5mm, the RGB color mode of the glass meets the following conditions: R value is 60-80, G value is 70-85, and B value is 60-80.

11. The gray glass composition according to claim 10, characterized in that, Based on a glass thickness of 5mm, the RGB color mode of the glass must meet at least one of the following conditions: (1) R value is 60-70, G value is 70-80, and B value is 65-75; (2) R:G=1: (1.1~1.2), R:B=1: (1.05~1.15), G:B=1: (0.9~1).

12. The gray glass composition according to claim 11, characterized in that, Based on a glass thickness of 5mm, the RGB color mode of the glass satisfies R:G=1:(1.14~1.16), R:B=1:(1.06~1.1), G:B=1:(0.93~0.95).

13. The gray glass composition according to claim 1, characterized in that, The mass percentage of the coloring component in the gray glass composition is as follows:

14. The gray glass composition according to claim 13, characterized in that, The mass percentage of the coloring component in the gray glass composition is as follows:

15. The gray glass composition according to any one of claims 1-7 and 13-14, characterized in that, The coloring component does not contain cerium dioxide (CeO2).

16. The gray glass composition according to any one of claims 1-7 and 13-14, characterized in that, The mass percentages of total iron (Fe2O3), titanium dioxide (TiO2), chromium trioxide (Cr2O3), cobalt oxide (CoO), selenium (Se), and tin oxide (SnO2) satisfy the following: total iron (Fe2O3) + 10 * (titanium dioxide (TiO2) + chromium trioxide (Cr2O3) + cobalt oxide (CoO) + selenium (Se) + tin oxide (SnO2) = 2.5% to 2.8%.

17. A type of vehicle window glass, characterized in that, The vehicle window glass comprises at least one glass plate prepared from the gray glass composition according to any one of claims 1 to 16, the thickness of the glass plate being 0.7 mm to 5 mm, and the vehicle window glass being a sunroof, side window, or triangular window.

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