Silver-free low-e coated glass with upper absorption capacity

Abstract

The utility model discloses a kind of silver-free LOW-E coated glass with upper absorption capacity, belong to coated glass technical field, the silver-free LOW-E coated glass includes glass substrate and low emissivity film layer;The low emissivity film layer includes bottom dielectric layer, second dielectric layer, transparent conductive low emissivity function layer, third dielectric layer, fourth dielectric layer, upper absorption layer and top dielectric layer sequentially laminated;The bottom dielectric layer covers the air surface of the glass substrate;It has excellent upper absorption capacity, low emissivity, good optical performance and film layer stability, strengthens the heat-insulating absorption capacity of silver-free LOW-E coated glass, can satisfy the demand of building energy saving and comfort, with important industry application value.

Description

Technical Field

[0001] This utility model belongs to the field of coated glass technology, specifically relating to a silver-free LOW-E coated glass with upper absorption capacity. Background Technology

[0002] Low-E (low-emissivity) coated glass, a type of special glass that combines energy saving and optical performance, is widely used in building curtain walls, doors and windows, passive energy-saving buildings, and other fields. Its core advantage lies in reflecting infrared heat through the low-emissivity coating, reducing building air conditioning energy consumption, while maintaining good visible light transmittance to meet indoor lighting needs. With the continuous improvement of energy conservation and environmental protection requirements and the diversified demands of architectural design for glass performance, the technological iteration of low-E coated glass focuses on lower emissivity, better optical matching, higher coating stability, and cost control.

[0003] Currently, the mainstream LOW-E coated glass on the market is mainly divided into two categories: silver-containing LOW-E glass and silver-free LOW-E glass. Silver-containing LOW-E glass achieves extremely low emissivity by setting a silver layer as the core low-emissivity functional layer. However, the silver layer is chemically reactive and easily oxidized and sulfided, resulting in poor corrosion resistance and wear resistance of the coating. In addition, the high cost of silver limits its application in some harsh environments and low-cost scenarios. Therefore, silver-free LOW-E glass, with its cost advantage and better environmental stability, has gradually become a hot topic in industry research and application. Its core is to use transparent conductive oxides such as indium tin oxide, fluorine-doped tin oxide, and aluminum-doped zinc oxide to replace the silver layer as the low-emissivity functional layer. By optimizing the coating structure design, the mechanical properties and environmental stability of the coating are improved while ensuring a certain energy-saving effect.

[0004] For example, Chinese patent CN 221662804 U discloses a low-heat-conductivity, high-shading silver-free Low-E coated glass, comprising a glass substrate and sequentially stacked layers on the glass substrate: a bottom dielectric layer, a second dielectric layer, a first transparent conductive low-emissivity functional layer, a third dielectric layer, a second transparent conductive low-emissivity functional layer, a fourth dielectric layer, and an upper dielectric layer. This low-heat-conductivity, high-shading silver-free Low-E coated glass has a superior heat transfer coefficient and a higher shading coefficient compared to ordinary offline single-silver low-emissivity coated glass. Its heat transfer coefficient is close to that of double-silver products and far superior to online Low-E products with similar colors. Although the silver-free Low-E coated glass disclosed in this patent has good heat insulation and absorption capabilities, it adopts a design of double transparent conductive low-emissivity functional layers and a full dielectric layer. This type of film design has high optical matching difficulty, poor film stability, limited shading control, and complex cost and manufacturing process. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a silver-free LOW-E coated glass with superior up-absorbing capacity. It combines excellent up-absorbing capacity, low emissivity, good optical performance, and film stability, thereby enhancing the heat insulation and absorption capacity of the silver-free LOW-E coated glass. This meets the requirements for building energy conservation and comfort, and has significant industry application value.

[0006] The technical solution adopted by this utility model is as follows:

[0007] This utility model provides a silver-free LOW-E coated glass with upper absorption capability, comprising a glass substrate and a low-emissivity film layer; the low-emissivity film layer comprises a bottom dielectric layer, a second dielectric layer, a transparent conductive low-emissivity functional layer, a third dielectric layer, a fourth dielectric layer, an upper absorption layer, and a top dielectric layer stacked sequentially; the bottom dielectric layer covers the air surface of the glass substrate.

[0008] The bottom dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the bottom dielectric layer is 80nm~120nm.

[0009] The second dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the second dielectric layer is 50nm~100nm.

[0010] The transparent conductive low-emissivity functional layer is any one of ITO layer, AZO layer, ATO layer, TNO layer, and FTO layer; the thickness of the transparent conductive low-emissivity functional layer is 50 nm to 150 nm.

[0011] The third dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the third dielectric layer is 40nm~80nm.

[0012] The fourth dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the fourth dielectric layer is 40nm~80nm.

[0013] The upper absorption layer is either a NiCr layer or a Cr layer; the thickness of the upper absorption layer is 10nm~25nm.

[0014] The top dielectric layer is either a Si3N4 layer or a SiO2 layer.

[0015] The thickness of the top dielectric layer is 50nm~100nm.

[0016] The glass substrate is a float glass substrate of various colors, preferably a clear glass or ultra-clear glass substrate.

[0017] The silver-free LOW-E coated glass with high absorption capacity provided by this utility model has the following beneficial effects:

[0018] 1. The addition of an upper absorption layer to the membrane system can efficiently absorb solar radiation heat in specific wavelengths. Combined with the infrared reflection characteristics of the low-emissivity functional layer, it achieves a dual heat control effect of absorption and reflection. In summer, it can reduce the transfer of solar radiation heat to the interior, reducing air conditioning energy consumption. In winter, it can reflect infrared heat radiation from the interior, reducing heat loss and improving the building's energy efficiency.

[0019] 2. Combining dielectric layers of different thicknesses can achieve optimal low-emissivity and color effects within different transmittance ranges, giving the glass a good appearance and meeting the aesthetic requirements of building facades.

[0020] 3. The bottom dielectric layer adheres closely to the glass substrate, enhancing the adhesion between the film and the substrate; the top dielectric layer protects the internal functional layer and upper absorption layer, resisting external friction, corrosion and other damage, and enhancing the mechanical strength of the film; in addition, the various dielectric layers work together to effectively block external moisture, oxygen and other substances from eroding the functional layer, further improving the durability of the film.

[0021] 4. Various colors of float glass substrates are available, which may not meet the needs of different applications.

[0022] 5. The thickness of each film layer is set within a reasonable range, which can be precisely controlled through mature coating processes such as magnetron sputtering, facilitating large-scale production. The reasonable combination of film layer thicknesses will not cause problems such as excessive internal stress or cracking due to excessive thickness, thus ensuring the yield rate of products.

[0023] 6. The silver-free LOW-E coated glass with upward absorption capability provided by this utility model allows for adjustment of the visible light transmittance of the glass between 15% and 75%, the reflectance between 5% and 20%, and the emissivity (E) between 0.05 and 0.20, while still having room for upward and downward expansion. Truly practical and widely applicable coated products in various color ranges can be developed according to market needs.

[0024] 7. The silver-free LOW-E coated glass with upper absorption capacity provided by this utility model has a heat transfer coefficient and shading coefficient comparable to ordinary offline single-silver low-emissivity coated glass, and is superior to online Low-E products with similar colors. Its film structure is simple, does not require significant changes to the existing target material sequence on the coating equipment, and can be mass-produced with slight adjustments. It has high production efficiency, stable quality, and can be stored for a long time without sealing, making it easy to promote and process in different locations. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of the silver-free LOW-E coated glass with upper absorption capacity provided by this utility model;

[0026] Among them, 10-glass substrate, 201-bottom dielectric layer, 202-second dielectric layer, 203-transparent conductive low-emissivity layer, 204-third dielectric layer, 205-fourth dielectric layer, 206-upper absorption layer, and 207-top dielectric layer. Detailed Implementation

[0027] This invention provides a silver-free LOW-E coated glass with high absorption capacity, such as... Figure 1 As shown, the device includes a glass substrate 10 and a low-emissivity film layer. The low-emissivity film layer includes a bottom dielectric layer 201, a second dielectric layer 202, a transparent conductive low-emissivity functional layer 203, a third dielectric layer 204, a fourth dielectric layer 205, an upper absorption layer 206, and a top dielectric layer 207, which are stacked sequentially. The bottom dielectric layer 201 covers the air surface of the glass substrate 10.

[0028] The production process of the silver-free LOW-E coated glass with upper absorption capacity is as follows:

[0029] (1) Provide 6mm white glass as a glass substrate and clean and dry it with deionized water.

[0030] (2) The bottom dielectric layer 201 was sputtered in an argon-nitrogen atmosphere using a medium frequency power supply and a rotating cathode. The atmosphere was Ar:N2=600:600sccm.

[0031] (3) The second dielectric layer 202 was sputtered in an argon-oxygen atmosphere using a medium frequency power supply and a rotating cathode. The atmosphere was Ar:O2=300:450sccm.

[0032] (4) A transparent conductive low-emissivity functional layer 203 was sputtered and deposited in an argon-oxygen atmosphere using a medium-frequency power supply and a rotating cathode. The atmosphere was Ar:O2=1000:20sccm.

[0033] (5) The bottom dielectric layer 204 was sputtered in an argon-nitrogen atmosphere using a medium frequency power supply and a rotating cathode. The atmosphere was Ar:O2=300:450sccm.

[0034] (6) A medium-frequency power supply with a rotating cathode was used to sputter and deposit the bottom dielectric layer 205 in an argon-nitrogen atmosphere with an atmosphere of Ar:N2=600:600sccm.

[0035] (7) The absorber layer 206 was deposited by planar cathode sputtering with DC power supply in an atmosphere of Ar=1000:sccm.

[0036] (8) The bottom dielectric layer 207 was sputtered in an argon-nitrogen atmosphere using a medium frequency power supply and a rotating cathode. The atmosphere was Ar:N2=600:600sccm.

[0037] (9) After sputtering, the glass is cut, ground and tempered at 400°C or above to obtain coated glass.

[0038] The present invention will now be described in detail with reference to the embodiments. The film structure and thickness of the silver-free LOW-E coated glass with upper absorption capacity in each embodiment are shown in Tables 1-4, and the performance is shown in Table 5.

[0039] Table 1. Structure of the coated glass in Example 1

[0040]

[0041] Table 2 shows the structure of the coated glass in Example 2.

[0042]

[0043] Table 3. Structure of the coated glass in Example 3

[0044]

[0045] Table 4. Structure of the coated glass in Example 4

[0046]

[0047] The performance of the coated glass in the above embodiments is shown in Table 5.

[0048] Table 5

[0049]

[0050] As can be seen from the above, the silver-free LOW-E coated glass with upper absorption capacity provided by this utility model can adjust the visible light transmittance of the glass between 15% and 75%, the reflectivity between 5% and 20%, and the emissivity E between 0.05 and 0.20 by adjusting the thickness of the upper absorption layer, thus exhibiting good heat insulation capabilities.

[0051] The above detailed description of a silver-free LOW-E coated glass with upper absorption capability, with reference to the embodiments, is illustrative rather than limiting. Several embodiments can be listed according to the defined scope. Therefore, changes and modifications without departing from the overall concept of this utility model should be within the protection scope of this invention.

Claims

1. A silver-free LOW-E coated glass with high absorption capacity, characterized in that, The silver-free LOW-E coated glass with upper absorption capability includes a glass substrate and a low-emissivity film layer; the low-emissivity film layer includes a bottom dielectric layer, a second dielectric layer, a transparent conductive low-emissivity functional layer, a third dielectric layer, a fourth dielectric layer, an upper absorption layer, and a top dielectric layer stacked sequentially; the bottom dielectric layer covers the air surface of the glass substrate.

2. The silver-free LOW-E coated glass with upper absorption capacity according to claim 1, characterized in that, The bottom dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the bottom dielectric layer is 80nm~120nm.

3. The silver-free LOW-E coated glass with upper absorption capacity according to claim 1, characterized in that, The second dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the second dielectric layer is 50nm~100nm.

4. The silver-free LOW-E coated glass with upper absorption capacity according to claim 1, characterized in that, The transparent conductive low-emissivity functional layer is any one of ITO layer, AZO layer, ATO layer, TNO layer, and FTO layer; the thickness of the transparent conductive low-emissivity functional layer is 50 nm to 150 nm.

5. The silver-free LOW-E coated glass with upper absorption capability according to any one of claims 1-4, characterized in that, The third dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the third dielectric layer is 40nm~80nm.

6. The silver-free LOW-E coated glass with upper absorption capability according to any one of claims 1-4, characterized in that, The fourth dielectric layer is either a Si3N4 layer or a SiO2 layer; the thickness of the fourth dielectric layer is 40nm~80nm.

7. The silver-free LOW-E coated glass with upper absorption capability according to any one of claims 1-4, characterized in that, The upper absorption layer is either a NiCr layer or a Cr layer; the thickness of the upper absorption layer is 10nm~25nm.

8. The silver-free LOW-E coated glass with upper absorption capability according to any one of claims 1-4, characterized in that, The top dielectric layer is either a Si3N4 layer or a SiO2 layer.

9. The silver-free LOW-E coated glass with upper absorption capacity according to claim 1, characterized in that, The thickness of the top dielectric layer is 50nm~100nm.

10. The silver-free LOW-E coated glass with upper absorption capability according to any one of claims 1-4, characterized in that, The glass substrate is a float glass substrate of various colors.

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