Dimming glass and preparation method thereof

Abstract

The invention discloses dimming glass and a preparation method thereof, and belongs to the technical field of glass. The dimming glass comprises 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 glue layer; a first metal layer is arranged on the first glass substrate, and a first orientation layer is arranged on the first metal layer to obtain a first plywood; a second metal layer is arranged on the second glass substrate, and a second orientation layer is arranged 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 glue layer is arranged on the outer ring of the dye liquid crystal layer and is used for bonding the first plywood and the second plywood; the thickness of the first metal layer and the second metal layer is 5-20 nm, and the used metal has a near-infrared reflection effect. The dimming glass is free of local black spots, uniform in dimming and high in yield 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] With the continuous development of society, people have higher and higher requirements for comfort such as good lighting when riding in cars. Existing cars improve the lighting in the car by setting up a panoramic skylight. The panoramic skylight is made of large-size glass. Although it can improve the lighting in the car, the car needs to be insulated and shaded when the sun is strong. Insulation and sunshade in the car can be achieved through external devices such as sunshades and sunshades. However, external devices will occupy the space in the car, so these traditional external devices are gradually being abandoned and replaced by new structures such as sunshade films and privacy films. This new structure has only one fixed state. The new structure is set on the glass, and the effect of the glass being covered is maintained regardless of day or night and whether the sun is strong or not. However, at night, it is hoped that the light from the outside can be shot into the car through the glass. In cold weather such as winter, it is hoped that the sun can be shot into the car through the glass to increase the temperature in the car. However, the glass shading state of the new structure is fixed, and it cannot adapt to the needs of people in the car as the environment changes.

[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 the first thin glass, the first ITO layer, the first orientation layer, the liquid crystal layer, the second orientation layer, the second ITO layer, and the second thin glass. The substrate of the functional layer is thin glass, which has low strength and is easy to break. It 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 the yield rate is low when manufacturing dimming glass. Summary of the invention

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

[0005] In order to achieve the above object, 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 an annular 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 injected between the first metal layer of the first plywood and the second metal layer of the second plywood; the annular adhesive layer is arranged on the outer circle 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.

[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 manner, the second glass substrate includes tempered glass and thin glass arranged in sequence; the tempered glass and the thin glass are bonded with PVB that can isolate ultraviolet rays.

[0009] In combination with the first aspect, in a possible implementation manner, 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 manner, the switchable glass further includes a heat insulating layer; and 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 manner, the thermal insulation layer is made of indium tin oxide or tin oxide.

[0012] In combination with the first aspect, in a possible implementation manner, the thermal insulation layer has a thickness of 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 dimming glass, which is used to prepare the dimming glass described above, comprising:

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

[0016] A second metal layer is disposed on the second glass substrate, and a second orientation layer is disposed 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 glue 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 by the embodiment of the present invention, when actually manufactured, is obtained by arranging a first metal layer on a first glass substrate, and arranging a first orientation layer on the first metal layer. A second metal layer is arranged on a second glass substrate, and a second orientation layer is arranged on the second metal layer to obtain a second plywood. The dimming glass of the embodiment of the present application is firstly manufactured by manufacturing a first plywood and a second plywood, and then a dye liquid crystal layer is poured between the first plywood and the second plywood, and finally the first plywood and the second plywood are bonded by arranging a ring glue layer on the outer ring of the dye liquid crystal layer to obtain a dimming glass. The dimming glass of the embodiment of the present application is directly used as a substrate (replacing the thin glass substrate of the functional layer of the existing dimming glass, omitting the step of bonding again after the functional layer of the existing dimming glass is manufactured) because the liquid crystal dye layer is poured between the first plywood and the second plywood manufactured in advance, and the first glass substrate and the second glass substrate are directly used as the substrate (replacing the thin glass substrate of the functional layer of the existing dimming glass, and omitting the step of bonding again after the functional layer of the existing dimming glass is manufactured), and the first plywood and the second plywood are bonded during the bonding process. The difference in box thickness caused by uneven bonding stress is avoided, and the liquid crystal is evenly dispersed, and the situation of poor local black spots is avoided. The dimming is uniform, the preparation process is simple and easy to operate, and the yield rate is improved when manufacturing the dimming glass. By setting a ring glue layer to bond the first plywood and the second plywood, 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 ≤ 5mm can be met, 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, and 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 an electrode layer, have a better conductive effect, and are electrically connected to a flexible circuit board (English abbreviation: FPC). When powered on, the liquid crystal can be driven to deflect, thereby achieving a rapid response of the dimming glass, reducing the signal difference between the output end and the input end of the dimming glass and the delay of the output signal, and the dimming effect is more uniform on large-size dimming glass. 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 glue layer is arranged on the outer circle of the dye liquid crystal layer, so that the first metal layer and the second metal layer will not contact 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 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 drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. 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 creative work.

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

[0022] Figure 2 A top view of the dimming 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 an 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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.

[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 positions or positional relationships based on the positions 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, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. 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 glue layer 4.

[0028] A first metal layer 2 is provided on the first glass substrate 1, and the first metal layer 2 can be provided on the first glass substrate 1 by a sputtering method. 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 the second glass substrate 8, and the second metal layer 7 can be provided on the second glass substrate 8 by a sputtering method. 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 crystal has the advantages of fast response speed, low haze, neutral color tone, and good display effect. During actual installation, the first plywood is located on the outdoor side and the outer side of the first glass substrate 1 is in contact with the air, and the second plywood is located on the indoor side and the outer side of the second glass substrate 8 is in contact with the air.

[0029] The outer ring of the dye liquid crystal layer 5 is provided with a ring adhesive layer 4, which is used to bond the first plywood and the second plywood. Specifically, the ring adhesive layer 4 is used to bond the first metal layer 2 and the second metal layer 7. The thickness of the first metal layer 2 and the second metal layer 7 is 5nm to 20nm, and the metal used has a near-infrared reflection 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, and then combining the first thin glass and the second thin glass of the functional layer 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 synthesizing the laminated glass, resulting in uneven force on the functional layer. Most of the combined dimming glasses have local black spots, resulting in uneven dimming, and the yield rate is low when manufacturing the dimming glass.

[0031] Compared with the existing dimming glass, the dimming glass provided in the embodiment of the present invention is actually manufactured by disposing a first metal layer 2 on a first glass substrate 1, and disposing 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 dimming glass in the embodiment of the present application is manufactured by firstly manufacturing a first plywood and a second plywood, and then injecting a dye liquid crystal layer 5 between the first plywood and the second plywood, and finally disposing a ring glue layer 4 on the outer ring of the dye liquid crystal layer 5 to bond the first plywood and the second plywood to obtain the dimming 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 functional layer of the existing dimming glass, and omitting the step of re-combining the functional layer of the existing dimming glass), 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 stress of the composite sheets, achieving uniform dispersion of liquid crystals, 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 ring glue 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 ≤5mm can be met, and the thickness can be flexibly changed according to the requirements. The thickness of the first metal layer 2 and the second metal layer 7 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 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 on, the liquid crystal can be driven to deflect, 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, and the dimming effect is more uniform on large-size dimming glass. 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 injected between the first metal layer 2 and the second metal layer 7, and an annular adhesive layer 4 is arranged on the outer circle of the dye liquid crystal layer 5, so that the first metal layer 2 and the second metal layer 7 will not contact 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 oxidation, and the first metal layer 2 and the second metal layer 7 can be sealed and will not be oxidized.

[0032] The dimming glass of the embodiment of the present application can be applied to the side windows, sunroof and other locations of a car.

[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 and the second glass substrate 8 of the dimming glass are bonded. If the dimming glass is broken, it will fall into the car, which is very dangerous. The second glass substrate 8 includes a tempered glass 81 and a thin glass 83 arranged in sequence. The tempered glass 81 and the thin glass 83 are bonded with PVB82 (Chinese: polyvinyl butyral ester) that can isolate ultraviolet rays, so that the tempered glass 81 and the thin glass 83 form a laminated glass, which can increase the strength and safety of the second glass substrate 8. The use of PVB82 that isolates ultraviolet rays can further isolate ultraviolet rays, enhance the ultraviolet cutoff effect of the dimming glass, and protect the dye liquid crystal.

[0036] Furthermore, the second glass substrate 8 includes two layers of tempered glass. The two layers of tempered glass are bonded by PVB that can isolate ultraviolet rays. The two layers of tempered glass have better strength. Before the two layers of tempered glass are bonded to form the second glass substrate 8, the tempered glass can be shaped, such as bent to a certain arc, so that the second glass substrate 8 can have more shapes.

[0037] The tempered glass 81 of the second glass substrate 8 may be bonded to the thin glass 83 or another tempered glass after the first metal layer 3 of the first plywood is bonded to the second metal layer 6 of the second plywood. Alternatively, the tempered glass 81 of the second glass substrate 8 may be bonded to the thin glass 83 or another tempered glass first, and then the first metal layer 3 of the first plywood is bonded to the second metal layer 6 of the second plywood.

[0038] The functional layer of the existing dimming glass is pre-made. For occasions where the dimming glass needs to have a certain curvature, the tempered glass bonded to the functional layer is first formed into the required curvature, and then the functional layer is sandwiched in the middle. The first thin glass and the second thin glass of the functional layer are the base. The first thin glass and the second thin glass are not flexible films and are flat. The shape is fixed and cannot be bent at will. The dimming glass can only be made with a smaller curvature, and the functional layer can be bonded between the two tempered glasses. If the required curvature of the dimming glass is large or complex, the thin glass of the functional layer bonded between the two tempered glasses cannot meet the deformation required. Even if it barely meets the requirement, the thin glass is easy to break and the yield rate is low. In addition, since the functional layer is forced to bend, it is also easy to cause poor display of the liquid crystal in 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 pre-made and then bonded, the tempered glass 81 can be made into a desired shape according to needs before making, such as a larger curvature. When the second glass substrate 8 uses tempered glass 81 and thin glass 83, the thin glass 83 can also be pre-formed into a desired shape and then bonded to the tempered glass 81. Afterwards, liquid crystal is poured between the first glass substrate 1 and the second glass substrate 8, and the liquid crystal arrangement is uniform, so that the dimming glass produced has a better display effect.

[0040] Further, the thickness of the tempered glass used in the first glass substrate 1 is 1 mm to 3 mm. When the second glass substrate 8 includes a tempered glass 81 and a 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 PVB is 0.38 mm to 1.52 mm.

[0041] Optionally, the dimming glass also includes a heat-insulating layer 9. The heat-insulating layer 9 is arranged 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 achieve an effect equivalent to that of online Lowe, thereby further enhancing the heat-insulating effect of the dimming glass. The heat-insulating layer 9 serves 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 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 thickness of the heat insulation layer is 70nm, 115nm, 125nm and 135nm, it can be seen that the thicker the heat insulation layer is, the higher the infrared reflectivity is and the better the heat insulation effect is. However, when the thickness increases to a certain extent, it will affect the transmittance. Therefore, the thickness of the heat insulation layer 9 is 50nm to 200nm, which can ensure both a better transmittance of the dimming glass and a better heat insulation effect.

[0044] In practice, since the spacing between the first glass substrate 1 and the second glass substrate 8 needs to match the requirement of the thickness of the liquid crystal box (<20um), the first glass substrate 1 and the second glass substrate 8 cannot be connected by PVB (thickness of 0.38mm to 1.52mm). In order to enhance the bonding force 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, and 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 the bonding of the first glass substrate 1 and the second glass substrate 8, and set the sealing in the spacer cavity of the dye liquid crystal layer 5. The sealant used in the first sealing ring glue layer 41 can be ordinary seal glue, and the sealant used in 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 dimming glass, which is used to prepare the above-mentioned dimming glass, including steps 1 to 3, and the serial numbers after the steps do not represent the order of execution.

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

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

[0048] Step 3: injecting 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 a ring 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 by 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-combining the existing dimming glass after the functional layer 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 stress of the combination, 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 ring glue 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 ≤5mm can be met, and the thickness can be flexibly changed according to the requirements. The thickness of the first metal layer 2 and the second metal layer 7 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 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 on, the liquid crystal can be driven to deflect, 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, and the dimming effect is more uniform on large-size dimming glass. 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 injected between the first metal layer 2 and the second metal layer 7, and an annular adhesive layer 4 is arranged on the outer circle of the dye liquid crystal layer 5, so that the first metal layer 2 and the second metal layer 7 will not contact 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 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 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), tempered glass 81, PVB82, thin glass 83 and a heat 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] Comparison example

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

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

[0058] Table 1

[0059] Example 1 Example 2 Comparison 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 can be seen from Table 1, the visible light transmittance of Example 1 and Example 2 is lower, and has a better sunshade effect. The heat insulation coefficient of Example 1 and Example 2 is lower, and has a better heat insulation effect. Since Example 1 has more PVB82, thin glass 83 and heat insulation layer 9 than Example 2, it has a better heat insulation effect. The K value of Example 1 is the lowest, and has a better heat insulation effect.

[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 may still be modified, or some or all of the technical features thereof may 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 dimming glass, characterized in that: It 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 glue layer; The first metal layer is disposed on the first glass substrate, and the first orientation layer is disposed on the first metal layer to obtain a first composite board; The second metal layer is disposed on the second glass substrate, and the second orientation layer is disposed on the second metal layer to obtain a second composite board; 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 outer ring of the dye liquid crystal layer is provided with the annular adhesive 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-20nm, and the metal used has a near-infrared reflection effect.

2. The dimming glass according to claim 1, characterized in that: The metal used for the first metal layer is silver, gold or aluminum.

3. The switchable glass according to claim 1, characterized in that: The second glass substrate includes tempered glass and thin glass arranged in sequence; The tempered glass and the thin glass are bonded by using PVB which can isolate ultraviolet rays.

4. The switchable glass according to claim 1, characterized in that: The second glass substrate includes two layers of tempered glass; The two layers of tempered glass are bonded by using PVB which can isolate ultraviolet rays.

5. The switchable glass according to claim 1, characterized in that: It also includes thermal insulation; The heat insulation layer is disposed on a side of the second glass substrate away from the second metal layer.

6. The switchable glass according to claim 5, characterized in that: The heat insulation layer is made of indium tin oxide or tin oxide.

7. The switchable glass according to claim 5 or 6, characterized in that: The thickness of the heat insulation layer is 50nm to 200nm.

8. The switchable glass according to claim 1, 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.

9. A method for preparing dimming glass, characterized in that: Used to prepare the dimming glass according to any one of claims 1 to 8, comprising: A first metal layer is disposed on a first glass substrate, and a first orientation layer is disposed on the first metal layer to obtain a first composite board; A second metal layer is disposed on the second glass substrate, and a second orientation layer is disposed on the second metal layer to obtain a second composite board; 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 glue layer is arranged on the outer circle of the dye liquid crystal layer to bond the first plywood and the second plywood.

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