Dimming glass, preparation method thereof and vehicle

Abstract

The present application relates to the technical field of assembled glass, and in particular to a type of dimming glass, a method for preparing the same, and a vehicle. The dimming glass comprises a stacked first glass substrate, a dimming layer, a functional layer, and a second glass substrate. The dimming layer is adjacent to the functional layer and is located between the first and second glass substrates. The functional layer has a plurality of stress buffer channels on the side facing the dimming layer. By providing stress buffer channels on the side of the functional layer facing the dimming layer, the stress caused by thermal expansion and contraction of the functional layer under high-temperature aging tests or thermal shock tests can be alleviated, thereby reducing unexpected movement within the dimming layer and avoiding mura in the dimming glass.

Description

Technical Field

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

[0002] Installing smart glass in vehicles can meet the demand for dimming in the interior. Smart glass is typically manufactured by laminating sheets in an autoclave and is available for sale after passing performance testing. However, while some smart glass may appear flawless after laminating in an autoclave, it can exhibit mura after high-temperature aging tests or thermal shock tests. Summary of the Invention

[0003] Based on this, the first aspect of the present application provides a dimming glass, and its technical solution is as follows:

[0004] A dimming glass comprises a stacked first glass substrate, a dimming layer, a functional layer, and a second glass substrate. The dimming layer is adjacent to the functional layer and is located between the first and second glass substrates. The functional layer has a plurality of stress buffer channels on a side facing the dimming layer.

[0005] The second aspect of the present application provides a method for preparing dimming glass, and the technical solution thereof is as follows:

[0006] A method for preparing dimming glass comprises the following steps:

[0007] A first glass substrate, a dimming layer, a functional layer, and a second glass substrate are laminated together to prepare dimming glass. Before laminating, the functional layer is cut so that a plurality of stress buffer channels are formed on the functional layer after laminating. When laminating, the functional layer is adjacent to the dimming layer and located between the first glass substrate and the second glass substrate, with the side having the plurality of buffer channels facing the dimming layer.

[0008] The third aspect of the present application provides a means of transport, the technical solution of which is as follows:

[0009] A vehicle comprises the above-mentioned switchable glass.

[0010] Compared with traditional solutions, this application has the following beneficial effects:

[0011] In the present application, the functional layer is adjacent to the dimming layer. By setting a stress buffer channel on the side of the functional layer facing the dimming layer, the stress generated by the thermal expansion and contraction of the functional layer on the dimming layer during high-temperature aging tests or hot and cold shock tests can be alleviated, thereby reducing unexpected movement inside the dimming layer and avoiding the phenomenon of uneven display (mura) of the dimming glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application and to more fully understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0013] Figure 1 Schematic diagram of the front view structure of a switchable glass according to one embodiment;

[0014] Figure 2 for Figure 1 A schematic diagram of the top view structure of the switchable glass;

[0015] Figure 3 for Figure 1 Schematic diagram of the top view structure of the functional layer in the switchable glass;

[0016] Figure 4 Schematic diagram of the front view of the switchable glass according to another embodiment;

[0017] Figure 5 Schematic diagram of the front view of the switchable glass according to another embodiment;

[0018] Figure 6 Schematic diagram of the front view of the switchable glass according to another embodiment;

[0019] Figure 7 This is a real-life picture of the switchable glass of Example 1 after high-temperature aging performance testing;

[0020] Figure 8 This is a real-life picture of the switchable glass of Comparative Example 1 after high-temperature aging performance testing;

[0021] Figure 9 This is a schematic top view of the external bonding layer of Example 2;

[0022] Figure 10 Schematic diagram of the top view of the inner bonding layer of Example 2;

[0023] Figure 11 This is a schematic top view of the external bonding layer of Example 3;

[0024] Figure 12 This is a schematic diagram of the top view of the inner bonding layer of Example 3. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below with reference to specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the present application's disclosure.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0027] the term

[0028] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0029] In this application, “several” means at least one, such as one, two, etc., unless otherwise clearly defined.

[0030] In this application, the selection scope involving "and / or", "or / and", and "and / or" includes any one of two or more relevant listed items, and also includes any and all combinations of the relevant listed items, and the said any and all combinations include any two relevant listed items, any more relevant listed items, or a combination of all relevant listed items.

[0031] The applicant analyzed the reasons why the display unevenness (mura) of the dimming glass after the high temperature aging test was found to be related to the fact that the dimming layer was more sensitive to stress. During the high temperature aging test, the dimming layer was easily subjected to stress from the adjacent functional layers, which caused unexpected movement inside the dimming layer and thus caused mura. Based on the above findings, the first aspect of the present application provides a dimming glass, see Figure 1 and Figure 2 In one embodiment, the switchable glass 100 includes a stacked first glass substrate 11, a first adhesive layer 12, a switchable layer 13, a functional layer 14, a second adhesive layer 15, and a second glass substrate 16. The orthographic projection of the switchable layer 13 is indented relative to the orthographic projection of the first adhesive layer 12. The orthographic projection of the functional layer 14 coincides with the orthographic projection of the switchable layer 13. The orthographic projection of the second adhesive layer 15 coincides with the orthographic projection of the first adhesive layer 12. A first edge-filling adhesive layer 17 is disposed in the indented region between the switchable layer 13 and the functional layer 14 in the first adhesive layer 12 and the second adhesive layer 15. The functional layer 14 has a plurality of stress buffer channels on the side facing the switchable layer 13.

[0032] The functional layer 14 is adjacent to the dimming layer 13. By providing stress buffer channels on the side of the functional layer 14 facing the dimming layer 13, the stress generated by the thermal expansion and contraction of the functional layer 14 during high-temperature aging tests or thermal shock tests can be alleviated. This reduces unintended movement within the dimming layer 13 and prevents mura in the dimming glass 100. Furthermore, the provision of several stress buffer channels helps reduce bending stress in the functional layer 14, significantly minimizing the degree of bending in the functional layer 14.

[0033] Optionally, both ends of the plurality of stress buffer channels are located at the edges of the functional layer 14, which helps to better alleviate the stress concentration phenomenon of the functional layer 14 during expansion and contraction, reducing the stress of the functional layer 14 on the dimming layer. At the same time, it also facilitates the degassing of the material and effectively prevents the formation of bubbles inside the dimming glass.

[0034] Optionally, the functional layer 14 includes a central area and a peripheral area surrounding the central area, and the plurality of stress buffer channels are preferably located in the peripheral area.

[0035] Optionally, the functional layer 14 is a polygon, for example, the functional layer 14 is a triangle, a quadrilateral, a pentagon, or a hexagon. Among them, quadrilaterals include but are not limited to squares, rectangles, and trapezoids. A plurality of stress buffer channels are independently located in at least one of the multiple corner regions of the polygon. It can be understood that the multiple corner regions refer to the multiple corners of the polygon as the central angle, the two adjacent partial side lines on both sides of the central angle as two radii, and the fan-shaped areas enclosed by the arc corresponding to the central angle and the two radii. Optionally, the two radii of the multiple corner regions each independently account for 6% to 14% of the length of the side line. For example, accounting for 6%, 8%, 10%, 12%, and 14% of the length of the side line. Optionally, the multiple corner regions each independently include a first radius and a second radius, and one end of the multiple stress buffer channels is located at the first radius, and the other end is located at the second radius.

[0036] Optionally, the plurality of stress buffer channels are independently in the shape of a straight line, a broken line or a curve.

[0037] Optionally, the depths of the plurality of stress buffering channels are independently less than or equal to the thickness of the functional layer. It is understandable that when the depth of the stress buffering channel is equal to the thickness of other functional layers, the functional layer is separated into discontinuous layers by the stress buffering channel.

[0038] Optionally, the widths of the plurality of stress buffer channels are independently 0.1 mm to 1 mm.

[0039] exist Figure 1 In the embodiment shown, the method of taking into account the shrinkage stress of the functional layer after the high temperature aging test is shown in FIG. Figure 3The functional layer 14 has four stress buffer channels 14A, 14B, 14C, and 14D on the side facing the dimming layer 13. In this embodiment, the functional layer 14 is square with a side length of 260 mm. The four corner regions each include a first radius and a second radius, both of which are 30 mm. The four stress buffer channels 14A, 14B, 14C, and 14D are located in the four corner regions of the functional layer 14 and are all arc-shaped, parallel to the arc corresponding to the central angle of the corner region, with one end located at the first radius and the other end located at the second radius. The depth of each channel is equal to the thickness of the functional layer 14, and the width w is 0.1 mm.

[0040] exist Figure 1 In the illustrated embodiment, the functional layer 14 includes a polarizer for converting a light beam into polarized light. The first adhesive layer 12 is laminated between the first glass substrate 11 and the dimming layer 13, adjacent to the dimming layer 13. The second adhesive layer 15 is disposed between the second glass substrate 16 and the functional layer 14, adjacent to the functional layer 14. In another embodiment, the first adhesive layer is laminated between the first glass substrate and the functional layer, adjacent to the functional layer, and the second adhesive layer is disposed between the second glass substrate and the dimming layer, adjacent to the dimming layer. Providing a stress buffer channel on the side of the polarizer facing the dimming layer can alleviate the stress on the dimming layer caused by the thermal expansion and contraction of the polarizer during high-temperature aging tests or thermal shock tests due to the different thermal expansion coefficients between the polarizer and the dimming layer, thereby reducing unexpected movement within the dimming layer and avoiding mura in the dimming glass. The material selection of the polarizer is not limited by the thermal expansion coefficient, and the selection is wider.

[0041] In other embodiments, the functional layer is an adhesive layer, and the functional layer includes a first functional layer and / or a second functional layer, wherein the first functional layer is used to bond the dimming layer to the first glass substrate, and the second functional layer is used to bond the dimming layer to the second glass substrate. A stress buffer channel is provided on the first functional layer and / or the second functional layer on the side facing the dimming layer to alleviate the stress on the dimming layer caused by the thermal expansion and contraction of the adhesive layer during high-temperature aging tests or thermal shock tests due to the difference in thermal expansion coefficients between the adhesive layer and the dimming layer, thereby reducing unexpected movement within the dimming layer and avoiding mura in the dimming glass. The material selection for the adhesive layer is not limited by the thermal expansion coefficient, and a wider range of options are available, thereby achieving a good dimming contrast effect.

[0042] See Figure 4In another embodiment, the switchable glass 200 includes a stacked first glass substrate 21, a first functional layer 22, a switchable layer 23, a second functional layer 25, and a second glass substrate 26. The orthographic projection of the switchable layer 23 is recessed relative to the orthographic projection of the first functional layer 22, and the orthographic projection of the second functional layer 25 overlaps with the orthographic projection of the first functional layer 22. A second edge-filling adhesive layer 27 is disposed in the recessed region of the switchable layer 23 between the first and second functional layers 22 and 25. The first and second functional layers 22 and 25 each independently have a plurality of stress buffer channels on the side facing the switchable layer 23.

[0043] Optionally, both ends of the stress buffer channels on the first functional layer 22 are located at the edge of the first functional layer 22 , and both ends of the stress buffer channels on the second functional layer 25 are located at the edge of the second functional layer 25 .

[0044] Optionally, the first functional layer 22 includes a central area and a peripheral area surrounding the central area, and the plurality of stress buffer channels are preferably located in the peripheral area.

[0045] Optionally, the first functional layer 22 is a polygon, for example, a triangle, a quadrilateral, a pentagon, or a hexagon. Quadrilaterals include, but are not limited to, squares, rectangles, and trapezoids. The plurality of stress buffering channels are each independently located in at least one of the plurality of corner regions of the polygon. Optionally, the two radii of the plurality of corner regions each independently account for 6% to 12% of the length of the respective edges. Optionally, the plurality of corner regions each independently include a first radius and a second radius, and one end of the plurality of stress buffering channels is located at the first radius and the other end is located at the second radius.

[0046] Optionally, the plurality of stress buffer channels are located in the central area of ​​the second functional layer 25 and the peripheral area surrounding the central area.

[0047] Optionally, the second functional layer 25 is a polygon, for example, a triangle, a quadrilateral, a pentagon, or a hexagon. Quadrilaterals include, but are not limited to, squares, rectangles, and trapezoids. The plurality of stress buffering channels are each independently located in at least one of the plurality of corner regions of the polygon. Optionally, the two radii of the plurality of corner regions each independently account for 6% to 12% of the length of the respective edges. Optionally, the plurality of corner regions each independently include a first radius and a second radius, and one end of the plurality of stress buffering channels is located at the first radius and the other end is located at the second radius.

[0048] It can be understood that the several stress buffer channels on the first functional layer 22 and the second functional layer 25 are as described above and will not be described again here.

[0049] exist Figure 4In the embodiment shown, the functional layer includes a first functional layer 22 and a second functional layer 25. In another embodiment, see Figure 5 The functional layer includes a first functional layer 32. The dimming glass 300 includes a stacked first glass substrate 31, a first functional layer 32, a dimming layer 33, a third adhesive layer 35, and a second glass substrate 36. The orthographic projection of the dimming layer 33 is indented relative to the orthographic projection of the first functional layer 32. The third adhesive layer 35 coincides with the orthographic projection of the first functional layer 32. A third edge-filling adhesive layer 37 is arranged in the indented area between the first functional layer 32 and the third adhesive layer 35 of the dimming layer 33. The first functional layer 32 has a plurality of stress buffer channels on the side facing the dimming layer 33. In another embodiment, see Figure 6 The functional layer includes a second functional layer 45. The switchable glass 400 includes a stacked first glass substrate 41, a fourth adhesive layer 42, a switchable layer 43, a second functional layer 45, and a second glass substrate 46. The orthographic projection of the switchable layer 43 is indented relative to the orthographic projection of the fourth adhesive layer 42. The orthographic projections of the second functional layer 45 and the fourth adhesive layer 42 coincide with each other. A fourth edge-filling adhesive layer 47 is disposed in the indented region of the switchable layer 43 between the fourth adhesive layer 42 and the second functional layer 45. The first functional layer 42 has a plurality of stress buffer channels on the side facing the switchable layer 43.

[0050] It is understandable that a plurality of stress buffer channels may be formed on the functional layer 14 , the first functional layer 22 , the first functional layer 32 , the second functional layer 25 and the second functional layer 45 by cutting.

[0051] Optionally, the first and second glass substrates are each independently flat glass or curved glass. They may be single-piece safety glass or multiple laminated safety glass. The first glass substrate may be an outer glass substrate, and the second glass substrate may be an inner glass substrate. The first adhesive layer, the first functional layer, and the fourth adhesive layer may be outer adhesive layers, and the second adhesive layer, the second functional layer, and the third adhesive layer may be inner adhesive layers.

[0052] Optionally, the dimming layer includes one or more combinations of PDLC (polymer dispersed liquid crystal), GHLC (guest-host effect liquid crystal), EC (electrochromic device), SPD (suspended particles), LC (dye liquid crystal), LED, heat insulation film, color-changing film, light-guiding film and display film.

[0053] Optionally, the thickness of the dimming layer is 0.38 mm to 0.76 mm.

[0054] Optionally, the thickness of the polarizer is 0.1 mm to 0.21 mm.

[0055] Optionally, the first adhesive layer, the second adhesive layer, the third adhesive layer, and the fourth adhesive layer each independently include one or more of PVB (polyvinyl butyral), EVA (ethylene vinyl acetate copolymer), PU (polyurethane), and OCA optical adhesive. For example, the adhesive layer may be a PVB layer, an EVA layer, a PU layer, an OCA optical adhesive, a composite layer of a PVB layer and an OCA optical adhesive, a composite layer of an EVA layer and an OCA optical adhesive, or a composite layer of a PU layer and an OCA optical adhesive.

[0056] Optionally, the thickness of the first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer are each independently 0.38 mm to 0.76 mm.

[0057] Optionally, the first functional layer 22, the first functional layer 32, the second functional layer 25, and the second functional layer 45 include one or more of PVB (polyvinyl butyral), EVA (ethylene vinyl acetate copolymer), PU (polyurethane), and OCA optical adhesive. For example, they may be a PVB layer, an EVA layer, a PU layer, an OCA optical adhesive, a composite layer of a PVB layer and an OCA optical adhesive, a composite layer of an EVA layer and an OCA optical adhesive, or a composite layer of a PU layer and an OCA optical adhesive.

[0058] Optionally, the thickness of the first functional layer 22 , the first functional layer 32 , the second functional layer 25 , and the second functional layer 45 are each independently 0.38 mm to 0.76 mm.

[0059] Optionally, the first edge-filling adhesive layer, the second edge-filling adhesive layer, the third edge-filling adhesive layer and the fourth edge-filling adhesive layer each independently include one or more of PVB (polyvinyl butyral), EVA (ethylene vinyl acetate copolymer) and PU (polyurethane).

[0060] It can be understood that the heights of the first edge-filling adhesive layer, the second edge-filling adhesive layer, the third edge-filling adhesive layer and the fourth edge-filling adhesive layer are consistent with the heights of the corresponding indented areas.

[0061] A second aspect of the present application further provides a method for preparing switchable glass, comprising the following steps:

[0062] A first glass substrate, a dimming layer, a functional layer, and a second glass substrate are laminated together to prepare dimming glass. Before laminating, the functional layer is cut so that a plurality of stress buffer channels are formed on the functional layer after laminating. When laminating, the functional layer is adjacent to the dimming layer and located between the first glass substrate and the second glass substrate, with the side having the plurality of buffer channels facing the dimming layer.

[0063] It can be understood that the positions of the plurality of stress buffer channels on the functional layer are as described above and will not be described in detail here. The plurality of stress buffer channels can be opened on the functional layer by cutting.

[0064] When the functional layer includes a polarizer, and the dimming layer is closer to the first glass substrate and the functional layer is closer to the second glass substrate, before laminating the sheets, a first adhesive layer adjacent to the dimming layer is added between the first glass substrate and the dimming layer, and a second adhesive layer adjacent to the functional layer is added between the second glass substrate and the functional layer. When the functional layer includes a polarizer, and the functional layer is closer to the first glass substrate and the dimming layer is closer to the second glass substrate, before laminating the sheets, a first adhesive layer adjacent to the functional layer is added between the first glass substrate and the functional layer, and a second adhesive layer adjacent to the dimming layer is added between the second glass substrate and the dimming layer.

[0065] When the functional layer includes a first functional layer and a second functional layer, a plurality of stress buffer channels are opened on the first functional layer, and a plurality of stress buffer channels are opened on the second functional layer. The first glass substrate, the first functional layer having the plurality of stress buffer channels, the dimming layer, the second functional layer having the plurality of stress buffer channels, and the second glass substrate are sequentially stacked and assembled.

[0066] When the functional layer includes a first functional layer, a plurality of stress buffer channels are opened on the first functional layer, and the first glass substrate, the first functional layer having the plurality of buffer channels, the dimming layer, the third adhesive layer and the second glass substrate are sequentially stacked and assembled.

[0067] When the functional layer includes a second functional layer, a plurality of stress buffer channels are opened on the second functional layer, and the first glass substrate, the fourth adhesive layer, the dimming layer, the second functional layer having the plurality of said buffer channels and the second glass substrate are sequentially stacked and assembled.

[0068] Optionally, the process parameters for lamination include: temperature of 100-150° C. and pressure of 1 bar-10 bar.

[0069] The third aspect of the present application further provides a vehicle comprising the dimming glass as described above.

[0070] Optionally, the means of transport is a vehicle.

[0071] The following is further described in conjunction with specific examples and comparative examples. Unless otherwise specified, the raw materials involved in the following specific examples and comparative examples can be sourced from commercial sources. The instruments used can be sourced from commercial sources unless otherwise specified. The processes involved can be selected conventionally by those skilled in the art unless otherwise specified.

[0072] Example 1 and Comparative Example 1

[0073] Example 1 provides a dimming glass and a preparation method thereof, the steps are as follows:

[0074] See also Figures 1 to 3 The structure shown in FIG. 1 includes an outer glass substrate 11 (2.1 mm white glass), an outer adhesive layer 12 (PVB, 0.76 mm), a dimming layer 13 (LC, 0.38 mm), a polarizer 14 (0.21 mm), an inner adhesive layer 15 (PVB, 0.38 mm), an inner glass substrate 16 (2.1 mm white glass), and an adhesive filler layer 17 (PVB, 0.6 mm). The outer glass substrate 11 , the outer adhesive layer 12 , the dimming layer 13 , the polarizer 14 , the inner adhesive layer 15 , and the inner glass substrate 16 are all square. The orthographic projections of the outer glass substrate 11 , the outer adhesive layer 12 , the inner adhesive layer 15 , and the inner glass substrate 16 overlap, and the side lengths are all 300 mm. The orthographic projections of the dimming layer 13 and the polarizer 14 overlap, and they are indented relative to the outer adhesive layer 12 and the inner adhesive layer 15 , and the side lengths are both 260 mm. The adhesive filler layer 17 is located in the indented area. The shortest distance between one end of the stress buffer channel 14A on the polarizer 14 and the center of the corner area is 28 mm, and the shortest distance between the other end and the center of the corner area is 28 mm. The shortest distance between one end of the stress buffer channel 14B and the center of the corner area is 28 mm, and the shortest distance between the other end and the center of the corner area is 28 mm. The shortest distance between one end of the stress buffer channel 14C and the center of the corner area is 28 mm, and the shortest distance between the other end and the center of the corner area is 28 mm. The shortest distance between one end of the stress buffer channel 14D and the center of the corner area is 28 mm, and the shortest distance between the other end and the center of the corner area is 28 mm.

[0075] At a temperature of 140°C and a pressure of 10 bar, the outer glass substrate, outer bonding layer, dimming layer, polarizer, inner bonding layer and inner glass substrate, as well as the bonding edge-filling laminate located in the indented area are stacked in sequence to prepare dimming glass.

[0076] Comparative Example 1 provides a dimming glass and a preparation method thereof, which are basically the same as Example 1, with the main difference being that the polarizer does not contain a stress buffer channel.

[0077] The high temperature aging performance test was conducted on the smart glass of Example 1 and Comparative Example 1. The test conditions were: 90°C, 1000h. After the high temperature aging performance test, the actual performance of the smart glass of Example 1 was as follows: Figure 7 As shown, the actual situation of the dimming glass of Comparative Example 1 is as follows Figure 8 As shown. Figure 7 and Figure 8 It can be seen that the smart glass of Comparative Example 1 has obvious black spots about 45 mm away from the edge, which is a mura phenomenon, while the smart glass of Example 1 has no black spots and has a good appearance.

[0078] Example 2

[0079] This embodiment provides a dimming glass and a preparation method thereof, and the steps are as follows:

[0080] See also Figure 4 、 Figure 9 and Figure 10 The structure shown in FIG. 1 includes an outer glass substrate 21 (2.1 mm white glass), an outer adhesive layer 22 (EVA, 0.38 mm), a dimming layer 23 (LC, 0.38 mm), an inner adhesive layer 25 (EVA, 0.38 mm), an inner glass substrate 26 (2.1 mm white glass), and an adhesive filler layer 27 (EVA, 0.38 mm). The outer glass substrate 21 , the outer adhesive layer 22 , the dimming layer 23 , the inner adhesive layer 25 , and the inner glass substrate 26 are all square. The orthographic projections of the outer glass substrate 21 , the outer adhesive layer 22 , the inner adhesive layer 25 , and the inner glass substrate 26 coincide, and the length of their edges is 300 mm. The dimming layer 23 is indented relative to the outer adhesive layer 22 and the inner adhesive layer 25 , and the length of their edges is 260 mm. The adhesive filler layer 27 is located in the indented area.

[0081] The outer bonding layer 22 includes a central area and a peripheral area surrounding the central area. The outer bonding layer 22 has four stress buffer channels 22A1, 22B1, 22C1 and 22D1 on the side facing the dimming layer 23. The four stress buffer channels 22A1, 22B1, 22C1 and 22D1 are all in the shape of a straight line, and both ends are located at the edge of the peripheral area. The depth is equal to the thickness of the outer bonding layer 22, and the width is w, which is 0.1 mm. The stress buffer channel 22A1 is parallel to the two sides of the outer bonding layer 22, and the distance to the nearest one of the two parallel sides is 40 mm. The stress buffer channel 22B1 is parallel to the two sides of the outer bonding layer 22, and the distance to the nearest one of the two parallel sides is 40 mm. The stress buffer channel 22C1 is parallel to the two sides of the outer bonding layer 22, and the distance to the nearest one of the two parallel sides is 40 mm. The stress buffer channel 22D1 is parallel to the two sides of the outer bonding layer 22, and the distance to the nearest one of the two parallel sides is 40 mm.

[0082] The inner bonding layer 25 includes a central area and a peripheral area surrounding the central area. The inner bonding layer 25 has four stress buffer channels 25A1, 25B1, 25C1 and 25D1 on the side facing the dimming layer 23. The four stress buffer channels 25A1, 25B1, 25C1 and 25D1 are all in a straight line, and both ends are located at the edge of the peripheral area. The depth is equal to the thickness of the inner bonding layer 25, and the width is w, which is 0.1 mm. The stress buffer channel 22A1 is parallel to the two sides of the inner bonding layer 25, and the distance to the nearest one of the two parallel sides is 40 mm. The stress buffer channel 22B1 is parallel to the two sides of the inner bonding layer 25, and the distance to the nearest one of the two parallel sides is 40 mm. The stress buffer channel 22C1 is parallel to the two sides of the inner bonding layer 25, and the distance to the nearest one of the two parallel sides is 40 mm. The stress buffer channel 22D1 is parallel to the two sides of the inner bonding layer 25, and the distance to the nearest one of the two parallel sides is 40 mm.

[0083] At a temperature of 110° C. and a pressure of 5 bar, the outer glass substrate, the outer bonding layer, the dimming layer, the inner bonding layer and the inner glass substrate, as well as the adhesive filler laminated sheet located in the indented area, were sequentially stacked to prepare the dimming glass.

[0084] Example 3

[0085] This embodiment provides a dimming glass and a preparation method thereof, and the steps are as follows:

[0086] See also Figure 4 、 Figure 11 and Figure 12 The structure shown in the figure includes an outer glass substrate 21 (2.1mm clear glass), an outer adhesive layer 22 (a composite layer of PVB layer and OCA optical adhesive, PVB layer 0.38mm + OCA optical adhesive 0.1mm), a dimming layer 23 (LC, 0.38mm), an inner adhesive layer 25 (a composite layer of PVB layer and OCA optical adhesive, PVB layer 0.38mm + OCA optical adhesive 0.1mm), an inner glass substrate 26 (2.1mm clear glass) and an adhesive filler layer. 27 (PVB layer, 0.38 mm), wherein the outer glass substrate 21, the outer bonding layer 22, the dimming layer 23, the inner bonding layer 25 and the inner glass substrate 26 are all square, the orthographic projections of the outer glass substrate 21, the outer bonding layer 22, the inner bonding layer 25 and the inner glass substrate 26 coincide with each other, and the side lengths are all 300 mm. The dimming layer 23 is indented relative to the outer bonding layer 22 and the inner bonding layer 25, and the side lengths are all 260 mm. The bonding filler layer 27 is located in the indented area.

[0087] The stress buffer channel on the outer bonding layer 22 is formed by cutting the OCA optical adhesive layer on the outer bonding layer. The outer bonding layer 22 has four stress buffer channels 22A2, 22B2, 22C2 and 22D2 on the side facing the dimming layer 23. The four stress buffer channels 22A2, 22B2, 22C2 and 22D2 are all in the shape of broken lines and are respectively located at the four corner areas of the outer bonding layer 22. One end is located at the first radius and the other end is located at the second radius. The depth is equal to the thickness of the OCA optical adhesive layer of the outer bonding layer, and the width is w, which is 0.1 mm. The shortest distance from one end of the stress buffer channel 22A2 to the center of the corner area is 20 mm, and the shortest distance from the other end to the center of the corner area is 20 mm. The shortest distance from one end of the stress buffer channel 22B2 to the center of the corner area is 20 mm, and the shortest distance from the other end to the center of the corner area is 20 mm. The shortest distance from one end of the stress buffer channel 22C2 to the center of the corner area is 20 mm, and the shortest distance from the other end to the center of the corner area is 20 mm. The shortest distance from one end of the stress buffer channel 22D2 to the center of the corner area is 20 mm, and the shortest distance from the other end to the center of the corner area is 20 mm.

[0088] The stress buffer channel on the inner bonding layer 25 is formed by cutting the OCA optical adhesive layer on the outer bonding layer. The inner bonding layer 25 has four stress buffer channels 25A2, 25B2, 25C2 and 25D2 on the side facing the dimming layer 23. The four stress buffer channels 25A2, 25B2, 25C2 and 25D2 are all in the shape of broken lines and are respectively located at the four corner areas of the inner bonding layer 25. One end is located at the first radius and the other end is located at the second radius. The depth is equal to the thickness of the OCA optical adhesive layer of the outer bonding layer, and the width is w, which is 0.1 mm. The shortest distance between one end of the stress buffer channel 25A2 and the center of the corner area is 20 mm, and the shortest distance between the other end and the center of the corner area is 20 mm. The shortest distance between one end of the stress buffer channel 25B2 and the center of the corner area is 20 mm, and the shortest distance between the other end and the center of the corner area is 20 mm. The shortest distance between one end of the stress buffer channel 25C2 and the center of the corner area is 20 mm, and the shortest distance between the other end and the center of the corner area is 20 mm. The shortest distance between one end of the stress buffer channel 25D2 and the center of the corner area is 20 mm, and the shortest distance between the other end and the center of the corner area is 20 mm.

[0089] At a temperature of 140° C. and a pressure of 10 bar, the outer glass substrate, outer bonding layer, dimming layer, inner bonding layer, inner glass substrate, and the bonding edge-filling laminated sheet located in the indented area were sequentially stacked to prepare dimming glass.

[0090] The switchable glasses of Example 2 and Comparative Example 3 were subjected to high-temperature aging performance tests using the same testing method as Example 1. After the high-temperature aging performance tests, the switchable glasses of Example 2 and Example 3 showed no black spots or mura, and had good appearance.

[0091] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A dimming glass, characterized in that: The invention comprises a stacked first glass substrate, a dimming layer, a functional layer and a second glass substrate. The dimming layer is adjacent to the functional layer and is located between the first glass substrate and the second glass substrate. The functional layer has a plurality of stress buffer channels on the side facing the dimming layer.

2. The switchable glass according to claim 1, characterized in that: Both ends of the plurality of stress buffer channels are located at the edge of the functional layer.

3. The switchable glass according to claim 1, characterized in that: The functional layer includes a central area and a peripheral area surrounding the central area, and the plurality of stress buffer channels are all located in the peripheral area.

4. The switchable glass according to claim 1, characterized in that: Include at least one of the following features: (1) Each of the plurality of stress buffer channels is independently in the shape of a straight line, a broken line, or a curve; (2) The depths of the plurality of stress buffer channels are independently less than or equal to the thickness of the functional layer; (3) The widths of the plurality of stress buffer channels are independently 0.1 mm to 1 mm.

5. The switchable glass according to any one of claims 1 to 4, characterized in that: The functional layer is used to convert the light beam into polarized light.

6. The switchable glass according to claim 5, characterized in that: The dimming glass further includes a first adhesive layer and / or a second adhesive layer, wherein the first adhesive layer is laminated between the first glass substrate and the dimming layer, adjacent to the dimming layer, and the second adhesive layer is laminated between the second glass substrate and the functional layer, adjacent to the functional layer; or the first adhesive layer is laminated between the first glass substrate and the functional layer, adjacent to the functional layer, and the second adhesive layer is laminated between the second glass substrate and the dimming layer, adjacent to the dimming layer.

7. The switchable glass according to claim 6, characterized in that: The orthographic projection of the dimming layer is retracted relative to the orthographic projection of the first bonding layer, the functional layer coincides with the orthographic projection of the dimming layer, the second bonding layer coincides with the orthographic projection of the first bonding layer, and a first filling bonding layer is arranged in the retracted area between the first bonding layer and the second bonding layer of the dimming layer and the functional layer.

8. The switchable glass according to any one of claims 1 to 4, characterized in that: The functional layer includes a first functional layer and / or a second functional layer. The first functional layer is used to bond the dimming layer and the first glass substrate; the second functional layer is used to bond the dimming layer and the second glass substrate.

9. The switchable glass according to claim 8, characterized in that: Meet one of the following conditions: (1) The functional layer includes the first functional layer and the second functional layer, the orthographic projection of the dimming layer is retracted relative to the orthographic projection of the first functional layer, the orthographic projection of the second functional layer coincides with the orthographic projection of the first functional layer, and the dimming layer is provided with a second edge-filling adhesive layer in the retracted area between the first functional layer and the second functional layer; (2) The functional layer includes a first functional layer, the dimming glass includes a third bonding layer, the third bonding layer is laminated between the dimming layer and the second glass substrate, the orthographic projection of the dimming layer is retracted relative to the orthographic projection of the first functional layer, the third bonding layer coincides with the orthographic projection of the first functional layer, and the dimming layer is provided with a third edge-filling bonding layer in the retracted area between the first functional layer and the third bonding layer; (3) The functional layer includes a second functional layer, the dimming glass includes a fourth bonding layer, the fourth bonding layer is laminated between the dimming layer and the first glass substrate, the orthographic projection of the dimming layer is retracted relative to the orthographic projection of the second functional layer, the fourth bonding layer coincides with the orthographic projection of the second functional layer, and the dimming layer is provided with a fourth edge-filling bonding layer in the retracted area between the second functional layer and the fourth bonding layer.

10. A method for preparing dimming glass, characterized in that: The following steps are involved: A first glass substrate, a dimming layer, a functional layer, and a second glass substrate are laminated together to prepare dimming glass. Before laminating, the functional layer is cut so that a plurality of stress buffer channels are formed on the functional layer after laminating. When laminating, the functional layer is adjacent to the dimming layer and located between the first glass substrate and the second glass substrate, with the side having the plurality of buffer channels facing the dimming layer.

11. A means of transport, characterized in that: The invention comprises the switchable glass according to any one of claims 1 to 9.

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