A neutral grey low-emissivity coated glass

Abstract

The present invention discloses a neutral gray low-emissivity coated glass, and relates to the technical field of Low-E glass. The film layer structure coated on the glass original sheet includes, from bottom to top, a first dielectric layer, a first metal functional layer, a second dielectric layer, a second metal functional layer, a third dielectric layer, a third metal functional layer, and a protective layer; wherein, the first metal functional layer is a composite layer of metal silver and copper, the second metal functional layer is silver, and the thickness of the silver in the second metal functional layer is greater than the thickness of the silver in the first metal functional layer. The neutral gray low-emissivity coated glass provided by the present invention is a double-silver Low-E glass, wherein the first metal functional layer has a thin silver layer and the second metal functional layer has a thick silver layer. Under a specific film layer structure, the colors of the front and side surfaces are uniform, the indoor color is neutral, the transmittance color is neutral, and the indoor surface reflectivity is low, and it has the advantages of low emissivity and good energy saving.

Description

Technical Field

[0001] The present invention relates to the technical field of Low-E glass, and in particular to a neutral grey low-emissivity coated glass. Background Art

[0002] Coated glass is glass that has one or more layers of metal, alloy or metal compound films coated on the surface to change the optical properties of the glass to meet certain specific requirements. Among them, Low-E energy-saving coated glass can effectively block ultraviolet rays and infrared rays, has a high transmittance to visible light, has low emissivity, and can effectively reduce heat transfer. It is currently the most widely used energy-saving building material. In the prior art, the production process of Low-E glass is to coat a multilayer film system with Ag as the functional layer, a dielectric layer and other metal layers on a high-quality float substrate. If divided according to the number of layers of silver in the functional layer, Low-E glass can be divided into single-silver Low-E glass, double-silver Low-E glass, and triple-silver Low-E glass. At present, single-silver and double-silver are both relatively mature energy-saving solutions in the field of architectural glass.

[0003] As the market matures, customers' demands for curtain wall appearance and color are becoming more diversified, and customers have higher requirements for curtain wall color and overall performance. In the past, the Low-E engineering glass market first considered the outdoor appearance, then the transmittance color, and finally the indoor color. However, as people gradually recognize and understand energy-saving glass, the indoor and outdoor appearance and transmittance color of Low-E products also affect people's choice of products. Therefore, when designing Low-E engineering glass products, manufacturers must take into account the three factors of outdoor appearance, transmittance color, and indoor color in order to obtain a good sales market.

[0004] The overall structure of the low-emissivity coated glass with publication number CN209602380U is designed as a double silver structure, and the specific film layers are a bottom dielectric layer, an Ag layer, a Cu layer, a protective layer, a second dielectric layer, an Ag layer, a silver layer protective layer, and an outer protective layer; however, the coated glass produced by this structure has a yellowish film surface color and a high indoor reflectivity, which does not meet people's needs; an orange-red double silver low-emissivity coated glass with publication number CN107382093B has an orange-red appearance color and also has the disadvantage of high indoor surface reflectivity.

[0005] It can be seen that the current Low-E coated glass market in China is dominated by double silver low-e coated glass, and most of the double silver low-e coated glass has uneven color on the front and side, and the color is inconsistent when observed from different angles. There is also a mainstream product with a thin bottom layer of Ag and a thick outer layer of silver. In order to ensure uniform color on the front and side, this product sacrifices the indoor surface reflectivity, resulting in a high indoor surface reflectivity and a mirror effect. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the existing Low-E coated glass has large color difference between the indoor surface color and the transmitted color and high indoor surface reflectivity.

[0007] In order to solve the above problems, the present invention proposes the following technical solutions:

[0008] A neutral gray low-emissivity coated glass, wherein the film layer structure coated on the glass original sheet comprises, from bottom to top, a first dielectric layer, a first metal functional layer, a second dielectric layer, a second metal functional layer, a third dielectric layer, a third metal functional layer and a protective layer, wherein the first metal functional layer is a superimposed layer of metal silver and copper, the second metal functional layer is a silver layer, and the thickness of the silver layer of the second metal functional layer is greater than the thickness of the silver layer of the first metal functional layer.

[0009] A further technical solution is that a metal protective layer is provided between the first metal functional layer and the second dielectric layer, and between the second metal functional layer and the third dielectric layer.

[0010] A further technical solution is that the metal protective layer is one or a combination of a Ti layer, a TiOx layer, a NiCr layer, a Cr layer and an AZO layer.

[0011] A further technical solution is that the thickness of the metal protective layer is 0.4nm-1.5nm.

[0012] A further technical solution is that the first dielectric layer, the second dielectric layer and / or the third dielectric layer is at least one of a SiNx layer, a ZnAlOx layer and a ZnSnOx layer.

[0013] A further technical solution is that in the first metal functional layer, the thickness ratio of the Ag layer to the Cu layer is 3-4:1.

[0014] A further technical solution is that the third metal functional layer is at least one of a NiCr layer and a Cr layer.

[0015] In this solution, the third metal functional layer plays the role of reducing the indoor reflectivity and reducing the visible light reflectivity of the indoor glass surface.

[0016] A further technical solution is that the thickness of the first dielectric layer is in the range of 38-43 nm; the thickness of the second dielectric layer is in the range of 79 nm-83 nm; and the thickness of the third dielectric layer is in the range of 20 nm-24 nm.

[0017] A further technical solution is that the thickness of the first metal functional layer is in the range of 4nm-7nm; the thickness of the second metal functional layer is in the range of 15nm-18nm; and the thickness of the third metal functional layer is in the range of 0.8nm-1.5nm.

[0018] A further technical solution is that the protective layer is selected from a SiNx layer, a ZrSiOx layer, or a stacked layer of a SiNx layer and a ZrOx layer, and the thickness of the protective layer is 30nm-35nm.

[0019] Compared with the prior art, the technical effects achieved by the present invention include:

[0020] The neutral gray low-emissivity coated glass provided by the present invention is a double-silver Low-E glass, in which the first metal functional layer has a thin silver layer and the second metal functional layer has a thick silver layer. Under a specific film layer structure, the colors of the front and side surfaces are uniform, the indoor color is neutral, the transmitted color is neutral, and the indoor surface reflectivity is low. It has the advantages of low emissivity and good energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a neutral grey low-emissivity coated glass provided in one embodiment of the present invention.

[0022] Figure 2 This is the angle change result of the neutral grey low-emissivity coated glass provided in Example 1.

[0023] Figure 3 The angle change results of the neutral gray low-emissivity coated glass provided in Comparative Example 1.

[0024] Figure 4 The angle change results of the neutral gray low-emissivity coated glass provided for comparative example 3.

[0025] Reference numerals

[0026] Glass original sheet 1, first dielectric layer 2, first metal functional layer 3, second dielectric layer 4, second metal functional layer 5, third dielectric layer 6, third metal functional layer 7, protective layer 8. DETAILED DESCRIPTION

[0027] 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. Obviously, the embodiments described below 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.

[0028] It should be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms.

[0029] See also Figure 1 The present invention provides a neutral gray low-emissivity coated glass. The film layer structure coated on the glass original sheet 1 includes, from bottom to top, a first dielectric layer 2, a first metal functional layer 3, a second dielectric layer 4, a second metal functional layer 5, a third dielectric layer 6, a third metal functional layer 7, and a protective layer 8.

[0030] The first metal functional layer 3 is a stacked layer of metal silver and copper, and the thickness ratio of the Ag layer to the Cu layer is 3-4: 1. Specifically, according to the film layer structure plated on the glass original sheet from bottom to top, the Ag layer is located below the Cu layer.

[0031] The second metal functional layer 5 is silver, and the thickness of the silver in the second metal functional layer 5 is greater than the thickness of the silver layer in the first metal functional layer 3 .

[0032] The third metal functional layer 7 is at least one of a NiCr layer and a Cr layer. The third metal functional layer plays a role in reducing the indoor reflectivity and reducing the visible light reflectivity of the indoor glass surface.

[0033] The first dielectric layer 2, the second dielectric layer 4 and / or the third dielectric layer 6 are at least one of a SiNx layer, a ZnAlOx layer and a ZnSnOx layer.

[0034] A metal protective layer is provided between the first metal functional layer 3 and the second dielectric layer 4, and between the second metal functional layer 5 and the third dielectric layer 6. The metal protective layer is a Ti layer, a TiOx layer, a NiCr layer, a Cr layer, an AZO layer, or a combination thereof. The thickness of the metal protective layer is 0.4 nm to 1.5 nm.

[0035] The protective layer 8 is selected from a SiNx layer, a ZrSiOx layer, or a stacked layer of SiNx and ZrOx, and the thickness of the protective layer 8 is 30nm-35nm.

[0036] The neutral grey low-emissivity coated glass provided by the present invention can be prepared by the following preparation method:

[0037] Glass substrate: The thickness can be 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 19mm clear glass or ultra-clear glass substrate, or it can be substrates of other thicknesses or other forms.

[0038] Glass cleaning: Use large-scale cleaning equipment, and require pure water resistivity greater than 10 16 Ω, clean and polish the glass surface.

[0039] Coating equipment: The background vacuum degree is required to be 10 -6 ~10 -7mbar or above, the vacuum degree of sputtering process is required to be 3~8*10 -3 mbar.

[0040] Neutral grey low-emissivity coated glass: On the glass surface, each film layer material is coated in sequence, and the thickness of the film layer and the atmosphere are adjusted. Those skilled in the art can select processing parameters according to the material of the film layer, which is not limited to magnetron sputtering, and can also be prepared by chemical vapor deposition, ion beam sputtering deposition, evaporation method and other physical or chemical deposition methods, which are not limited in the present invention.

[0041] The neutral gray low-emissivity coated glass provided in the embodiment of the present invention is a double-silver Low-E glass, wherein the first metal functional layer has a thin silver layer and the second metal functional layer has a thick silver layer. Under a specific film layer structure, the colors of the front and side surfaces are uniform, the indoor color is neutral, the transmitted color is neutral, and the indoor surface reflectivity is low, and the glass has the advantages of low emissivity and good energy saving.

[0042] Example 1

[0043] Embodiment 1 of the present invention provides a neutral gray low-radiation coated glass (double silver Low-E glass) with uniform color on the front and side surfaces and low film surface reflectivity. The film layer structure is shown in Table 1, wherein the glass original sheet 1 is a white glass substrate with a thickness of 6 mm.

[0044] Table 1 Film structure of Example 1

[0045]

[0046] The neutral grey low-emissivity coated glass designed according to the film structure in Table 1 can achieve the effect of uniform color and low indoor reflection when the product is observed at different angles. The detailed colors are as shown in Table 2:

[0047] Table 2 Color parameters of neutral gray low-emissivity coated glass of Example 1

[0048]

[0049] This visual color meets the market's requirements for uniform and unchanged side color, no mirror effect indoors, and consistent front and side colors.

[0050] The neutral gray low-emissivity coated glass of Example 1 of the present invention has a glass surface color of L*:53.51, a*:-2.38, and b*:-5.16 on the outdoor side. According to the CIELAB colorimetric color and the qualitative analysis of the appearance color of Low-E glass on the market, this color is a neutral light gray, which is also a color that is more recognized in the Low-E market.

[0051] The side color observation record of Example 1 of the present invention is as follows in Table 3:

[0052] Table 3 Side color observation parameters of Example 1

[0053]

[0054] As shown in Table 3 above: the overall side change trend is: L* (52.59 to 55.26), a* (-1.48 to -2.56), b* (-4.84 to -5.52) Change trend: L*: 2.67, a*: 1.08, b*: 0.68, the side visual effect color is consistent, the side color change trend is shown in Figure 2 .

[0055] like Figure 2 The results show that the average overall color of the side surface of Example 1 of the present invention is: L*: 53.36, a*: -2.24, b*: -5.06. This color is basically consistent with the front color, and the side surface observed from different angles is consistent with the front color. The detailed color comparison is shown in Table 4:

[0056] Table 4:

[0057]

[0058] It should be noted that, in the current Low-E market, the glass with thin bottom silver layer and thick outer silver layer, similar to Example 1, has an inner reflectivity greater than 20%, which will cause a mirror effect indoors at night. However, the indoor reflectivity of Example 1 of the present invention is 16%, which will not cause a mirror effect at night and the film surface color is relatively soft. Taking the conventional hollow structure of two 6mm ordinary white glass sheets sandwiched with a 12mm spacer (the structure is abbreviated as 6C+12A+6C) as an example, the specific film surface color is as shown in Table 5:

[0059] Table 5:

[0060]

[0061] Example 2

[0062] Embodiment 2 of the present invention provides a neutral grey low-emissivity coated glass with uniform color on the front and side surfaces and low film surface reflectivity. The film layer structure is shown in Table 6. The original glass sheet 1 is a white glass substrate with a thickness of 6 mm.

[0063] Table 6 Film structure of Example 2

[0064]

[0065] The neutral grey low-emissivity coated glass designed according to the film structure in Table 6 can achieve the effect of uniform color and low indoor reflection when the product is observed at different angles. The detailed colors are as shown in Table 7:

[0066] Table 7: Color parameters of neutral grey low-emissivity coated glass of Example 2

[0067]

[0068] The neutral grey low-emissivity coated glass prepared in Example 2 has a single piece of glass with a color close to that in Example 1, and has a uniform color when observed from different side angles, and has performance close to that in Example 1.

[0069] It can be seen that within the parameter range defined by the present invention, under a specific film layer structure, a neutral gray low-emissivity coated glass with uniform color on the front and sides, neutral color indoors and neutral transmitted color can be obtained. This type of glass has a low indoor surface reflectivity and has the advantages of low emissivity and good energy saving.

[0070] Comparative Example 1

[0071] Comparative Example 1 provides a double silver Low-E glass containing Cu. Compared with Example 1, it lacks the third metal layer. Its film layer structure is shown in Table 8, wherein the glass original sheet 1 is a white glass substrate with a thickness of 6 mm.

[0072] This comparative example 1 is a more mainstream structure in the current market of Low-E double silver. Although the color changes are uniform on the front and side, due to the large indoor reflectivity, the indoor is brighter than the outdoor at night, resulting in the reflection of human figures on the indoor surface, and it is not easy to see the outside from the indoor. The detailed structure is shown in Table 8 below:

[0073] Table 8 Film structure of comparative example 1

[0074]

[0075] The coated glass was designed and matched according to the film layer structure in Table 8. The front side can achieve an appearance color similar to that of Example 1. The detailed colors are shown in Table 9 below, and the color values ​​at different angles are shown in Table 10:

[0076] Table 9 Front color parameters of comparative example 1

[0077]

[0078] Table 10 Color parameters at different angles of comparative example 1

[0079]

[0080] It can be seen that the overall profile change trend of Comparative Example 1 is: L* (54.83 to 58.40), a* (-0.04 to -1.58), b* (-5.28 to -5.93) change trend: L*: 3.57, a*: 1.54, b*: 0.65. The detailed change trend is as follows Figure 3 .

[0081] The color uniformity of the front and side surfaces of the comparative example 1 is obviously worse than that of the embodiment 1 of the present invention, and the indoor reflectivity is much higher than that of the embodiment 1. The detailed colors are shown in the following Table 11:

[0082] Table 11 Comparison of indoor surface colors of Example 1 and Comparative Example 1

[0083]

[0084] According to the results in Table 11, it can be seen that, under the premise of low indoor reflectivity, the indoor color of Example 1 of the present invention is neutral, while the indoor color of Comparative Example 1 is reddish, which is not conducive to market promotion. Example 1 of the present invention is obviously superior to Comparative Example 1 in color appearance and visual effect.

[0085] Comparative Example 2

[0086] Comparative Example 2 provides a double silver Low-E glass that does not contain Cu, and its film layer structure and film layer target material are shown in Table 12, wherein the original glass sheet is a white glass substrate with a thickness of 6 mm.

[0087] Table 12 Film structure of comparative example 2

[0088]

[0089] In comparative example 2, the first metal functional layer has no Cu layer and is set as a single Ag layer. The color value a* of the transmitted color is negative and b* is positive. The color is obviously green, so the color change of the side is not considered. The overall color of comparative example 2 of the present invention is shown in Table 12, and the side color is shown in Table 13:

[0090] Table 13 Overall color parameters of comparative example 2

[0091]

[0092] Comparative Example 3

[0093] Comparative Example 3 provides a Cu-containing double silver Low-E glass, whose film layer structure and film layer target material are shown in Table 14, wherein the original glass sheet is a white glass substrate with a thickness of 6 mm.

[0094] Table 14 Film structure of comparative example 3

[0095]

[0096] The first metal functional layer of Comparative Example 3 is significantly better than that of Example 1 in terms of performance. Under the same light transmittance, the thickness of the silver layer is compared as shown in Table 15 below:

[0097] It should be noted that if the first metal functional layer Ag is thick, the overall spectrum of the product will shift after 40 degrees, and the color will be uneven when observed from the side at different angles, specifically appearing bluish purple.

[0098] Table 15 Comparison of silver layers of Example 1 and Comparative Example 3

[0099] First metal layer Second metal layer Example 1 4.5nm 16.2nm Comparative Example 3 10nm 15.9nm

[0100] It can be seen from Table 15 above that the thickness of the silver layer in Comparative Example 2 is significantly higher than that in Example 1, and the emissivity is lower than that in Example 1. However, Low-E glass can have spectral curves with different emissivity under the same transmittance.

[0101] Although the performance of comparative example 3 of the present invention is higher than that of example 1, there is discoloration in the front and side uniformity, and the transmission color difference. The overall color of comparative example 3 of the present invention is shown in Table 16, and the side color is shown in Table 17:

[0102] Table 16 Overall color parameters of comparative example 3

[0103]

[0104] Table 17 Side color parameters of comparative example 3

[0105]

[0106] As shown in Tables 16-17 above: The overall profile change trend of Comparative Example 3 is: L* (54.02 to 62.79), a* (0.15 to -3.50), b* (-1.58 to -9.72) Change trend: L*: 8.77, a*: 3.68, b*: 8.14. Detailed changes are as follows Figure 4 :

[0107] Comparative Example 3 of the present invention has a common problem of double-silver engineering glass in the current Low-E market: the color of the front and side surfaces is uneven when observed at different angles, which is mainly reflected in that the product appears reddish purple below an angle of 45 degrees on the side surface (which is more obvious on cloudy or semi-cloudy days).

[0108] The transparent color of the product of comparative example 3 of the present invention is more neutral than that of embodiment 1, and the color comparison thereof is shown in Table 18:

[0109] Table 18 Indoor color comparison of Example 1 and Comparative Example 3

[0110]

[0111] In summary, the neutral gray low-emissivity coated glass provided by the present invention has the characteristics of a thin inner silver layer and a thick outer silver layer. On the basis of a three-silver film layer structure, through the film layer optimization design, a double-silver product is developed with the appearance of no discoloration on the side, uniform color on the front and side, neutral color indoors, neutral transmittance, and indoor emissivity lower than 16%.

[0112] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0113] The above is a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A neutral grey low-emissivity coated glass, characterized in that: The film layer structure plated on the glass original sheet is composed of a first dielectric layer, a first metal functional layer, a metal protective layer, a second dielectric layer, a second metal functional layer, a metal protective layer, a third dielectric layer, a third metal functional layer and a protective layer from bottom to top; wherein the first metal functional layer is a superimposed layer of metal silver and copper, the second metal functional layer is a silver layer, and the third metal functional layer is at least one of a NiCr layer and a Cr layer; wherein the thickness of the first metal functional layer is in the range of 4nm-7nm, and the thickness ratio of the Ag layer to the Cu layer is 3-4:1; the thickness of the second metal functional layer is in the range of 15nm-18nm; the thickness of the third metal functional layer is in the range of 0.8nm-1.5nm; and the neutral gray low-emissivity coated glass is double silver Low-E glass.

2. The neutral grey low-emissivity coated glass according to claim 1, characterized in that: The metal protective layer is one or a combination of a Ti layer, a TiOx layer, a NiCr layer, a Cr layer, and an AZO layer.

3. The neutral grey low-emissivity coated glass according to claim 2, characterized in that: The thickness of the metal protective layer is 0.4nm-1.5nm.

4. The neutral grey low-emissivity coated glass according to claim 1, characterized in that: The first dielectric layer, the second dielectric layer and / or the third dielectric layer is at least one of a SiNx layer, a ZnAlOx layer and a ZnSnOx layer.

5. The neutral grey low-emissivity coated glass according to claim 1, characterized in that: The thickness of the first dielectric layer is in the range of 38nm-43nm; the thickness of the second dielectric layer is in the range of 79nm-83nm; and the thickness of the third dielectric layer is in the range of 20nm-24nm.

6. The neutral grey low-emissivity coated glass according to claim 1, characterized in that: The protective layer is selected from a SiNx layer, a ZrSiOx layer, or a stacked layer of a SiNx layer and a ZrOx layer, and the thickness of the protective layer is 30nm-35nm.

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