A dimming glass and its preparation method

Abstract

The present application discloses a dimming glass and a preparation method thereof, belonging to the field of glass technology. The dimming glass includes a first glass substrate, a first metal layer, a first orientation layer, a dye liquid crystal layer, a second orientation layer, a second metal layer, a second glass substrate and an annular adhesive layer; a first metal layer is provided on the first glass substrate, a first orientation layer is provided on the first metal layer to obtain a first plywood; a second metal layer is provided on the second glass substrate, a second orientation layer is provided on the second metal layer to obtain a second plywood; a dye liquid crystal layer is poured between the first metal layer of the first plywood and the second metal layer of the second plywood; an annular adhesive layer is provided on the outer ring of the dye liquid crystal layer, and the annular adhesive layer is used to bond the first plywood and the second plywood; the thickness of the first metal layer and the second metal layer is 5nm to 20nm, and the metal used has a near-infrared reflection effect. The dimming glass of the present application does not have local black spots, dimming is uniform, and the yield rate is high during manufacturing.

Description

Technical Field

[0001] The present application relates to the field of glass technology, and in particular to a dimming glass and a preparation method thereof. Background Art

[0002] As society continues to develop, people's demands for comfort, such as better lighting, are increasing. Existing cars often feature panoramic sunroofs to improve interior lighting. These panoramic sunroofs are made of large glass, and while they can improve interior lighting, they also require insulation and sunshade protection when sunlight is strong. External devices such as sunshades and visors can achieve this. However, these external devices encroach on interior space, leading to their gradual elimination in favor of newer structures such as sunshade films and privacy films. These new structures have a fixed state: they remain shielded regardless of day or night, or sunlight intensity. However, at night, people prefer to allow outside light to filter through the glass, and in cold weather, such as winter, they prefer sunlight to filter through the glass to warm the interior. However, these new structures maintain a fixed shading state and are unable to adapt to changing environmental conditions.

[0003] The dimming glass is controlled by voltage to change between the scattering (transparent) state and the transmission (transparent) state, thereby achieving the transparency, heat insulation, sunshade and other requirements of the glass, and its application is becoming more and more extensive. The functional layers of the existing dimming glass include a first thin glass, a first ITO layer, a first orientation layer, a liquid crystal layer, a second orientation layer, a second ITO layer, and a second thin glass. The base of the functional layer is thin glass, which has low strength and is easily brittle and cannot be used alone. The two sides of the functional layer must be combined with a piece of tempered glass through PVB to form a laminated glass before it can be used as dimming glass. Due to the fluidity of the liquid crystal in the functional layer and the uneven pressure when synthesizing the laminated glass, the functional layer is unevenly stressed. Most of the combined dimming glasses have local black spots, resulting in uneven dimming and a low yield rate when manufacturing dimming glass. Summary of the Invention

[0004] The embodiments of the present application provide a smart glass and a preparation method thereof, which can solve the problem that the existing smart glass has local black spots, resulting in uneven dimming and low yield when manufacturing the smart glass.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is:

[0006] In a first aspect, an embodiment of the present invention provides a dimming glass, comprising a first glass substrate, a first metal layer, a first orientation layer, a dye liquid crystal layer, a second orientation layer, a second metal layer, a second glass substrate and a ring adhesive layer; the first metal layer is arranged on the first glass substrate, and the first orientation layer is arranged on the first metal layer to obtain a first plywood; the second metal layer is arranged on the second glass substrate, and the second orientation layer is arranged on the second metal layer to obtain a second plywood; the dye liquid crystal layer is poured between the first metal layer of the first plywood and the second metal layer of the second plywood; the ring adhesive layer is arranged on the outer circle of the dye liquid crystal layer, and the ring adhesive layer is used to bond the first plywood and the second plywood; the thickness of the first metal layer and the second metal layer is 5nm to 20nm, and the metal used has a near-infrared reflection effect.

[0007] In combination with the first aspect, in a possible implementation manner, the metal used for the first metal layer is silver, gold or aluminum.

[0008] In combination with the first aspect, in a possible implementation, the second glass substrate includes tempered glass and thin glass arranged in sequence; the tempered glass and the thin glass are bonded using PVB that can isolate ultraviolet rays.

[0009] In combination with the first aspect, in a possible implementation, the second glass substrate includes two layers of tempered glass; the two layers of tempered glass are bonded together using PVB that can isolate ultraviolet rays.

[0010] In combination with the first aspect, in a possible implementation, the switchable glass further includes a heat insulating layer; the heat insulating layer is disposed on a side of the second glass substrate away from the second metal layer.

[0011] In combination with the first aspect, in a possible implementation, the thermal insulation layer is made of indium tin oxide or tin oxide.

[0012] In combination with the first aspect, in a possible implementation, the thickness of the thermal insulation layer is 50 nm to 200 nm.

[0013] In combination with the first aspect, in a possible implementation, the ring glue layer includes a first sealing ring glue layer and a second sealing ring glue layer; the first sealing ring glue layer and the second sealing ring glue layer are sequentially arranged on the outer circle of the dye liquid crystal layer, and the first sealing ring glue layer is close to the dye liquid crystal layer.

[0014] In a second aspect, another embodiment of the present invention provides a method for preparing a switchable glass, which is used to prepare the switchable glass described above, comprising:

[0015] A first metal layer is provided on a first glass substrate, and a first alignment layer is provided on the first metal layer to obtain a first composite board;

[0016] Disposing a second metal layer on a second glass substrate, and disposing a second orientation layer on the second metal layer to obtain a second composite board;

[0017] The dye liquid crystal layer is poured between the first metal layer of the first plywood and the second metal layer of the second plywood, and the ring adhesive layer is arranged on the outer circle of the dye liquid crystal layer to bond the first plywood and the second plywood.

[0018] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0019] The dimming glass provided in the embodiment of the present invention is actually manufactured by providing a first metal layer on a first glass substrate, and then providing a first orientation layer on the first metal layer to obtain a first plywood. A second metal layer is provided on a second glass substrate, and then providing a second orientation layer on the second metal layer to obtain a second plywood. The dimming glass of the embodiment of the present application is first manufactured by manufacturing a first plywood and a second plywood, then injecting a dye liquid crystal layer between the first plywood and the second plywood, and finally bonding the first plywood and the second plywood by providing an annular adhesive layer around the outer ring of the dye liquid crystal layer to obtain the dimming glass. Since the liquid crystal dye layer is injected between the first and second plywood, the dimming glass of the embodiment of the present application directly uses the first and second glass substrates as the substrate (replacing the thin glass substrate of the functional layer of the existing dimming glass, omitting the step of re-bonding the functional layer after the existing dimming glass is manufactured). During the bonding process of the first and second plywood, no pressure is applied to the dye liquid crystal layer, thereby avoiding the difference in cell thickness caused by uneven bonding stress, achieving uniform dispersion of liquid crystal, avoiding the problem of localized black spots, and achieving uniform dimming. The manufacturing process is simple and easy to operate, and the yield rate of dimming glass is improved. By setting a ring adhesive layer to bond the first and second plywood together, the dimming glass assembly becomes a laminated glass, and the dimming function is integrated into the laminated glass, which has high safety. The structure of the dimming glass of the embodiment of the present application is less than the first thin glass, the second thin glass, and the PVB layers that bond them, so the overall thickness is reduced, which can meet the requirement of an assembly thickness of ≤5mm, and the thickness can be flexibly changed according to the requirements. The thickness of the first metal layer and the second metal layer of the embodiment of the present application is 5nm to 20nm, and the metal used has a near-infrared reflection effect. The first metal layer and the second metal layer can reflect near-infrared light and transmit visible light, thereby achieving adjustment based on the visible light band and blocking near-infrared light, achieving the effect of sunshade and heat insulation. At the same time, the first metal layer and the second metal layer can replace the existing ITO layer as the electrode layer, have better conductive effect, and are electrically connected to the flexible circuit board (FPC). When powered, they can drive the liquid crystal deflection, thereby achieving a fast response of the dimming glass, reducing the signal difference between the output and input ends of the dimming glass and the delay of the output signal. On large-sized dimming glass, the dimming effect is more uniform. The first metal layer and the second metal layer are relatively thin and are easily oxidized if placed in the air. In the dimming glass of the embodiment of the present application, a dye liquid crystal layer is injected between the first metal layer and the second metal layer, and an annular adhesive layer is provided on the outer ring of the dye liquid crystal layer, so that the first metal layer and the second metal layer will not come into contact with the outside world, and the metal layers can be isolated from water and oxygen. There is no need to add a protective layer to prevent them from oxidation, and the first metal layer and the second metal layer can be sealed and will not be oxidized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 of the present invention or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A cross-sectional view of the switchable glass provided in an embodiment of the present application;

[0022] Figure 2 A top view of the switchable glass provided in an embodiment of the present application;

[0023] Figure 3 This is a relationship diagram between the light length and reflectivity of the dimming glass with different insulation layer thicknesses provided in the embodiment of the present application.

[0024] Icons: 1-first glass substrate; 2-first metal layer; 3-first orientation layer; 4-ring glue layer; 41-first sealing ring glue layer; 42-second sealing ring glue layer; 5-dye liquid crystal layer; 6-second orientation layer; 7-second metal layer; 8-second glass substrate; 81-tempered glass; 82-PVB; 83-thin glass; 9-thermal insulation layer; 10-flexible circuit board. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0027] Please refer to Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a dimming glass, including a first glass substrate 1, a first metal layer 2, a first orientation layer 3, a dye liquid crystal layer 5, a second orientation layer 6, a second metal layer 7, a second glass substrate 8 and an annular adhesive layer 4.

[0028] A first metal layer 2 is provided on a first glass substrate 1, which can be provided by sputtering. A first orientation layer 3 is provided on the first metal layer 2 to obtain a first plywood. A second metal layer 7 is provided on a second glass substrate 8, which can be provided by sputtering. A second orientation layer 6 is provided on the second metal layer 7 to obtain a second plywood. A dye liquid crystal layer 5 is injected between the first metal layer 2 of the first plywood and the second metal layer 7 of the second plywood. Dye liquid crystals have the advantages of fast response speed, low haze, neutral light tone, and excellent display effect. During actual installation, the first plywood is located outdoors with the outer side of the first glass substrate 1 exposed to air, while the second plywood is located indoors with the outer side of the second glass substrate 8 exposed to air.

[0029] An annular adhesive layer 4 is disposed around the outer ring of the dye liquid crystal layer 5. This layer is used to bond the first and second plywood sheets. Specifically, the annular adhesive layer 4 is used to bond the first and second metal layers 2 and 7. The thickness of the first and second metal layers 2 and 7 is 5 nm to 20 nm, and the metal used has a near-infrared reflective effect.

[0030] The existing dimming glass is prepared by first manufacturing a functional layer including a first thin glass, a first ITO layer, a first orientation layer, a liquid crystal layer, a second orientation layer, a second ITO layer and a second thin glass. Then, the outer sides of the first thin glass and the second thin glass of the functional layer are respectively combined with a piece of tempered glass through PVB to form the dimming glass. Since the functional layer is manufactured first, the liquid crystal in the functional layer has fluidity, and the pressure is uneven when the laminated glass is synthesized, resulting in uneven force on the functional layer. Therefore, the combined dimming glass mostly has local black spots, resulting in uneven dimming and a low yield rate when manufacturing the dimming glass.

[0031] Compared to existing smart glass, the smart glass provided in the embodiments of the present invention is manufactured by disposing a first metal layer 2 on a first glass substrate 1, and a first orientation layer 3 on the first metal layer 2 to obtain a first plywood. A second metal layer 7 is disposed on a second glass substrate 8, and a second orientation layer 6 is disposed on the second metal layer 7 to obtain a second plywood. The smart glass in the embodiments of the present application is manufactured by first fabricating a first plywood and a second plywood. A dye liquid crystal layer 5 is then injected between the first and second plywoods. Finally, a ring adhesive layer 4 is disposed on the outer ring of the dye liquid crystal layer 5 to bond the first and second plywoods together to obtain the smart glass. In the dimming glass of the embodiment of the present application, since the liquid crystal dye layer is poured between the first and second plywoods that have been manufactured in advance, the first glass substrate 1 and the second glass substrate 8 are directly used as the substrate (replacing the thin glass substrate of the existing dimming glass functional layer, and omitting the step of re-laminaring after the functional layer of the existing dimming glass is manufactured), the first and second plywoods will not apply pressure to the dye liquid crystal layer 5 during the bonding process, thereby avoiding the difference in box thickness caused by uneven lamination stress, achieving uniform dispersion of liquid crystal, avoiding the situation of local black spots, uniform dimming, simple and easy-to-operate preparation process, and improving the yield rate when manufacturing dimming glass. By setting the annular adhesive layer 4 to bond the first and second plywoods, the dimming glass assembly becomes a laminated glass, and the dimming function is integrated into the laminated glass, which has high safety. Compared with the existing dimming glass, the structure of the dimming glass of the embodiment of the present application lacks the first thin glass, the second thin glass, and the PVB layers for bonding them, so that the overall thickness is reduced, and the requirement of the assembly thickness ≤ 5 mm can be met, and the thickness can be flexibly changed according to the requirements. The first metal layer 2 and the second metal layer 7 of the embodiment of the present application have a thickness of 5nm to 20nm. The metal used has a near-infrared reflection effect. The first metal layer 2 and the second metal layer 7 can reflect near-infrared light and transmit visible light, thereby achieving adjustment based on the visible light band and blocking near-infrared light, achieving the effect of sunshade and heat insulation. At the same time, the first metal layer 2 and the second metal layer 7 can replace the existing ITO layer as an electrode layer, have a better conductive effect, and are electrically connected to the flexible circuit board 10 (English abbreviation: FPC). When powered, it can drive the liquid crystal deflection, thereby achieving a fast response of the dimming glass, reducing the signal difference between the output and input ends of the dimming glass and the delay of the output signal. On large-sized dimming glass, the dimming effect is more uniform. The first metal layer 2 and the second metal layer 7 are relatively thin and are easily oxidized if placed in the air. In the dimming glass of the embodiment of the present application, a dye liquid crystal layer 5 is poured between the first metal layer 2 and the second metal layer 7, and an annular adhesive layer 4 is provided on the outer ring of the dye liquid crystal layer 5, so that the first metal layer 2 and the second metal layer 7 will not come into contact with the outside world, and the metal layers can be isolated from water and oxygen. There is no need to add a protective layer to prevent them from oxidation, and the first metal layer 2 and the second metal layer 7 can be sealed and will not be oxidized.

[0032] The switchable glass of the embodiment of the present application can be applied to automobile side windows, sunroofs, and other locations.

[0033] Optionally, the metal used for the first metal layer 2 is silver, gold or aluminum, which has a good near-infrared reflection effect.

[0034] In practice, the second glass substrate 8 may only be made of tempered glass.

[0035] The first glass substrate 1 of the switchable glass is bonded to the second glass substrate 8. If the switchable glass breaks, it could fall into the vehicle, posing a high risk. The second glass substrate 8 comprises a tempered glass 81 and a thin glass 83, arranged in sequence. The tempered glass 81 and the thin glass 83 are bonded together using UV-blocking PVB82 (polyvinyl butyral), forming a laminated glass. This increases the strength and safety of the second glass substrate 8. The UV-blocking PVB82 further blocks UV rays, enhancing the UV-blocking effect of the switchable glass and protecting the dye-based liquid crystal.

[0036] Furthermore, the second glass substrate 8 comprises two layers of tempered glass. The two layers of tempered glass are bonded together using PVB, which can block ultraviolet rays. Using two layers of tempered glass provides better strength. Before the two layers of tempered glass are bonded together to form the second glass substrate 8, the tempered glass can be shaped, such as by bending a certain arc, thereby allowing the second glass substrate 8 to have a wider range of shapes.

[0037] The first metal layer 3 of the first plywood and the second metal layer 6 of the second plywood can be bonded together before the tempered glass 81 of the second glass substrate 8 and the thin glass 83 or another tempered glass are bonded together. Alternatively, the tempered glass 81 of the second glass substrate 8 and the thin glass 83 or another tempered glass can be bonded together first before the first metal layer 3 of the first plywood and the second metal layer 6 of the second plywood are bonded together.

[0038] The functional layer of existing switchable glass is prefabricated. To achieve a desired curvature, the tempered glass bonded to the functional layer is first formed into the desired curvature, then sandwiched between the functional layer. The first and second thin glass layers serve as the base. These first and second thin glass layers are not flexible films but are flat, with fixed shapes that cannot be bent freely. This results in a smaller curvature for the switchable glass, allowing the functional layer to be bonded between the two tempered glass layers. If the desired curvature of the switchable glass is large or complex, the thin glass layer bonded between the two tempered glass layers cannot deform to the desired shape. Even if it does, the thin glass is prone to breakage, resulting in a low yield. Furthermore, the forced bending of the functional layer can easily lead to poor display of the liquid crystal within the functional layer.

[0039] In the dimming glass of the embodiment of the present application, the first glass substrate 1 can be made of tempered glass, and the second glass substrate 8 includes tempered glass 81 and thin glass 83 arranged in sequence, or includes two layers of tempered glass. Since the first glass substrate 1 and the second glass substrate 8 are prefabricated and then bonded together, the tempered glass 81 can be formed into a desired shape as required before production, such as a larger curvature. When the second glass substrate 8 is made of tempered glass 81 and thin glass 83, the thin glass 83 can also be pre-formed into the desired shape and then bonded to the tempered glass 81. Liquid crystal is then poured between the first glass substrate 1 and the second glass substrate 8, and the liquid crystal arrangement is uniform, thereby achieving a better display effect of the dimming glass.

[0040] Furthermore, the tempered glass used in the first glass substrate 1 has a thickness of 1 mm to 3 mm. When the second glass substrate 8 includes tempered glass 81 and thin glass 83 arranged in sequence, the thickness of the tempered glass 81 is 1 mm to 3 mm, and the thickness of the thin glass 83 is 0.5 mm to 1 mm. When the second glass substrate 8 includes two layers of tempered glass, the thickness of the tempered glass is 1 mm to 3 mm. The thickness of the PVB is 0.38 mm to 1.52 mm.

[0041] Optionally, the dimming glass further includes a heat-insulating layer 9. The heat-insulating layer 9 is disposed on the side of the second glass substrate 8 away from the second metal layer 7. If the dimming glass is used in a car, the heat-insulating layer 9 is located inside the car and is in direct contact with the air. The contact between the heat-insulating layer 9 and the air can achieve a certain low-emissivity effect, which can be equivalent to the effect of online Lowe, thereby further enhancing the heat-insulating effect of the dimming glass. The heat-insulating layer 9 acts as a low-emissivity surface on the indoor side. In addition to having a certain infrared reflection effect, it can also reduce the heat transfer coefficient of the glass and enhance the heat-insulating effect of the glass. In addition, the safety of the dimming glass can also be improved.

[0042] The heat insulation layer 9 is in direct contact with the air and needs to have better oxidation resistance. The heat insulation layer 9 is made of indium tin oxide or tin oxide, which can enhance the oxidation resistance of the heat insulation layer 9.

[0043] The thickness of the heat insulation layer 9 is 50nm to 200nm. Figure 3 As shown in the figure, when the insulation layer thickness is 70nm, 115nm, 125nm, and 135nm, it can be seen that the thicker the insulation layer, the higher the infrared reflectivity and the better the insulation effect. However, when the thickness increases to a certain level, the transmittance is affected. Therefore, the thickness of the insulation layer 9 is 50nm to 200nm, which can ensure both good transmittance and excellent insulation effect of the dimming glass.

[0044] In practice, since the spacing between the first glass substrate 1 and the second glass substrate 8 needs to match the thickness of the liquid crystal cell (less than 20 μm), the first glass substrate 1 and the second glass substrate 8 cannot be connected by PVB (thickness of 0.38 mm to 1.52 mm). To enhance the bonding strength between the first glass substrate 1 and the second glass substrate 8, the ring glue layer 4 includes a first sealing ring glue layer 41 and a second sealing ring glue layer 42. The first sealing ring glue layer 41 and the second sealing ring glue layer 42 are sequentially arranged on the outer ring of the dye liquid crystal layer 5. The first sealing ring glue layer 41 is close to the dye liquid crystal layer 5, so that the first sealing ring glue layer 41 and the second sealing ring glue layer 42 work together to achieve bonding between the first glass substrate 1 and the second glass substrate 8, and to set the seal in the spacer cavity of the dye liquid crystal layer 5. The sealant used for the first sealing ring glue layer 41 can be ordinary seal glue, and the sealant used for the second sealing ring glue layer 42 can be liquid optical glue such as OCR.

[0045] Another embodiment of the present invention provides a method for preparing a switchable glass, which is used to prepare the switchable glass, including steps 1 to 3. The serial numbers after the steps do not represent the order of execution.

[0046] Step 1: a first metal layer 2 is provided on a first glass substrate 1, and a first orientation layer 3 is provided on the first metal layer 2 to obtain a first composite board.

[0047] Step 2: a second metal layer 7 is provided on a second glass substrate 8, and a second orientation layer 6 is provided on the second metal layer 7 to obtain a second composite board.

[0048] Step 3: pouring the dye liquid crystal layer 5 between the first metal layer 2 of the first plywood and the second metal layer 7 of the second plywood, and providing an annular adhesive layer 4 on the outer circle of the dye liquid crystal layer 5 to bond the first plywood and the second plywood.

[0049] The dimming glass prepared by the preparation method of the dimming glass provided in the embodiment of the present invention has a liquid crystal dye layer that is poured between the first and second plywoods that have been prepared in advance, and directly uses the first glass substrate 1 and the second glass substrate 8 as the substrate (replacing the thin glass substrate of the existing dimming glass functional layer, and omitting the step of re-joining the functional layers after the existing dimming glass is prepared). During the bonding process of the first and second plywoods, no pressure is applied to the dye liquid crystal layer 5, thereby avoiding the difference in box thickness caused by uneven joining stress, achieving uniform dispersion of liquid crystal, avoiding the situation of poor local black spots, uniform dimming, simple and easy-to-operate preparation process, and improving the yield rate when manufacturing dimming glass. By setting the annular adhesive layer 4 to bond the first and second plywoods, the dimming glass assembly becomes a laminated glass, and the dimming function is integrated into the laminated glass, which has high safety. Compared with the existing dimming glass, the structure of the dimming glass in the embodiment of the present application lacks the first thin glass, the second thin glass, and the PVB layers for bonding them, so that the overall thickness is reduced, and the requirement of the assembly thickness ≤ 5 mm can be met, and the thickness can be flexibly changed according to the requirements. The first metal layer 2 and the second metal layer 7 of the embodiment of the present application have a thickness of 5nm to 20nm. The metal used has a near-infrared reflection effect. The first metal layer 2 and the second metal layer 7 can reflect near-infrared light and transmit visible light, thereby achieving adjustment based on the visible light band and blocking near-infrared light, achieving the effect of sunshade and heat insulation. At the same time, the first metal layer 2 and the second metal layer 7 can replace the existing ITO layer as an electrode layer, have a better conductive effect, and are electrically connected to the flexible circuit board 10 (English abbreviation: FPC). When powered, it can drive the liquid crystal deflection, thereby achieving a fast response of the dimming glass, reducing the signal difference between the output and input ends of the dimming glass and the delay of the output signal. On large-sized dimming glass, the dimming effect is more uniform. The first metal layer 2 and the second metal layer 7 are relatively thin and are easily oxidized if placed in the air. In the dimming glass of the embodiment of the present application, a dye liquid crystal layer 5 is poured between the first metal layer 2 and the second metal layer 7, and an annular adhesive layer 4 is provided on the outer ring of the dye liquid crystal layer 5, so that the first metal layer 2 and the second metal layer 7 will not come into contact with the outside world, and the metal layers can be isolated from water and oxygen. There is no need to add a protective layer to prevent them from oxidation, and the first metal layer 2 and the second metal layer 7 can be sealed and will not be oxidized.

[0050] Specific embodiments of the switchable glass of the present invention are provided herein.

[0051] Example 1

[0052] The structure of the dimming glass from outdoor to indoor is the first glass substrate 1 (tempered glass), the first metal layer 2 (silver), the first orientation layer 3, the dye liquid crystal layer 5, the second orientation layer 6, the second metal layer 7 (silver), the tempered glass 81, PVB82, the thin glass 83 and the thermal insulation layer 9 (indium tin oxide).

[0053] Example 2

[0054] The structure of the dimming glass from outdoor to indoor is a first glass substrate 1 (tempered glass), a first metal layer 2 (silver), a first orientation layer 3, a dye liquid crystal layer 5, a second orientation layer 6, a second metal layer 7 (silver), and a tempered glass 81.

[0055] Control Example

[0056] Tempered glass, PVB, first thin glass, first ITO layer, first alignment layer, liquid crystal layer, second alignment layer, second ITO layer, second thin glass, PVB, tempered glass.

[0057] The heat insulation effect simulation data of Example 1, Example 2 and the control example (existing smart glass) when the smart layer is in the dark state are shown in Table 1 below.

[0058] Table 1

[0059] Example 1 Example 2 Control Example <![CDATA[Visible light transmittance (T v )]]> 1.1 1.1 1.4 Thermal insulation coefficient (g) 0.23 0.26 0.45 K value 3.4 5.1 5.1

[0060] As shown in Table 1, Examples 1 and 2 have lower visible light transmittance and better sunshade performance. They also have lower thermal insulation coefficients and better insulation performance. Because Example 1 includes PVB 82, thin glass 83, and thermal insulation layer 9, compared to Example 2, it offers better insulation performance. Example 1 has the lowest K value and offers superior insulation performance.

[0061] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0062] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A method for preparing dimming glass, characterized in that: include: A first metal layer is provided on a first glass substrate, and a first alignment layer is provided on the first metal layer to obtain a first composite board; Disposing a second metal layer on a second glass substrate, and disposing a second orientation layer on the second metal layer to obtain a second composite board; A dye liquid crystal layer is poured between the first metal layer of the first plywood and the second metal layer of the second plywood, and a ring adhesive layer is provided on the outer circle of the dye liquid crystal layer to bond the first plywood and the second plywood; The thickness of the first metal layer and the second metal layer is 5nm to 20nm, and the metal used has a near-infrared reflection effect; Wherein, the second glass substrate comprises tempered glass and thin glass arranged in sequence; The tempered glass and the thin glass are bonded with PVB that can isolate ultraviolet rays; Alternatively, the second glass substrate comprises two layers of tempered glass; The two layers of tempered glass are bonded by using PVB that can isolate ultraviolet rays. 2 . The method for preparing switchable glass according to claim 1 , wherein the metal used for the first metal layer is silver, gold or aluminum.

3. The method for preparing the switchable glass according to claim 1, wherein: It also includes thermal insulation; The heat insulation layer is arranged on a side of the second glass substrate away from the second metal layer.

4. The method for preparing the switchable glass according to claim 3, wherein: The heat insulation layer is made of indium tin oxide or tin oxide.

5. The method for preparing the switchable glass according to any one of claims 3 to 4, characterized in that: The thickness of the heat insulation layer is 50nm~200nm.

6. The method for preparing the switchable glass according to claim 1, wherein: The ring glue layer includes a first sealing ring glue sublayer and a second sealing ring glue sublayer; The first sealing ring gluon layer and the second sealing ring gluon layer are sequentially arranged on the outer circle of the dye liquid crystal layer, and the first sealing ring gluon layer is close to the dye liquid crystal layer.

7. A dimming glass, characterized in that: Prepared according to the method according to any one of claims 1-2.

8. The switchable glass according to claim 7, characterized in that: It also includes thermal insulation; The heat insulation layer is arranged on a side of the second glass substrate away from the second metal layer.

9. The switchable glass according to claim 8, characterized in that: The heat insulation layer is made of indium tin oxide or tin oxide.

10. The switchable glass according to claim 8, characterized in that: The thickness of the heat insulation layer is 50nm~200nm.

11. The switchable glass according to claim 7, characterized in that: The ring glue layer includes a first sealing ring glue sublayer and a second sealing ring glue sublayer; The first sealing ring gluon layer and the second sealing ring gluon layer are sequentially arranged on the outer circle of the dye liquid crystal layer, and the first sealing ring gluon layer is close to the dye liquid crystal layer.

Images