Dimming glass

Abstract

The invention provides dimming glass with an enclosure layer structure. An electric heating component is arranged in the fence layer, and local secondary heating can be conducted on fence layer materials with the high melting temperature requirement. Through the arrangement, the sealing function of the enclosure layer can be realized to the greatest extent, water vapor / impurities are prevented from invading into the dimming glass, the service life of the dimming glass is prolonged, meanwhile, the area of a dimming function-free region at the edge of the dimming glass is reduced as much as possible, and the application scene of the dimming glass is increased.

Description

Technical Field

[0001] The invention relates to the field of electronic light-controlling materials, and in particular to dimming glass. Background Art

[0002] Smart glass is a light control device, which is mainly to set a smart film between two layers of transparent glass plates. The types of smart films include suspended particle (SPD) smart film, polymer dispersed liquid crystal (PDLC) smart film, electrochromic (EC) smart film, thermochromic (TC) smart film and photochromic (PC) smart film. Smart glass made of suspended particle smart film, polymer dispersed liquid crystal smart film and electrochromic smart film are called suspended particle smart glass, polymer dispersed liquid crystal smart glass and electrochromic smart glass respectively. For suspended particle smart glass, polymer dispersed liquid crystal smart glass or electrochromic smart glass, when electricity is turned on, the arrangement or state of the active material in the smart film changes, so that the light transmittance of the smart glass changes, such as from low transmittance to high transmittance, or from high transmittance to low transmittance. This type of dimming glass can achieve rapid conversion between the light-transmitting state and the light-shielding state through the action of electric field / current. It has the advantages of actively controlling light transmittance and energy saving. The device can be used as smart windows and rearview mirrors, sunglasses, displays, etc. in spacecraft, high-speed railways, automobiles, buildings, etc.

[0003] The production of suspended particle dimming glass, polymer dispersed liquid crystal dimming glass, and electro-variable dimming glass generally uses PVB film (Polyvinyl butyral interlayer) or EVA film (Ethylene-vinylacetate) for producing laminated glass. However, the water barrier performance of PVB or EVA film is poor, so that the dimming film at the edge of the dimming glass is affected by water vapor / impurities in the environment and deteriorates and fails, resulting in unqualified performance of the dimming glass product. The current general practice is to reduce the size of the dimming film and reserve a large space around the dimming glass, that is, the overlap difference between the dimming film and the corresponding edges of the first transparent glass plate, the second transparent glass plate, the first interlayer and the second interlayer is large; by setting a larger area without dimming function, it can block the intrusion of water vapor, thereby preventing water vapor / impurities in the environment from penetrating into the dimming film, but the problem is that there is no dimming function in the area with a width of several centimeters around the dimming glass, which limits the application scenarios of the dimming glass.

[0004] POE or TPO materials have excellent water vapor barrier properties. However, the ideal melting temperature of POE or TPO is 135-160°C. However, using such a high temperature during the lamination process can easily lead to failure of the dimming film performance. Therefore, the lamination temperature of the dimming glass is generally controlled below 120°C. Therefore, during the lamination process, the POE or TPO in the enclosure layer is not completely melted, resulting in large haze and poor transparency in the enclosure layer area, which seriously affects the appearance of the dimming glass.

[0005] Therefore, it is necessary to invent a better dimming glass preparation technology, which can not only reduce the area without dimming function at the edge of the dimming glass, but also eliminate the problem of performance degradation and failure of the dimming film around the dimming glass due to the invasion of water vapor / impurities in the environment, thereby extending the service life of the dimming glass and expanding the application scenarios of the dimming glass.

[0006] The present invention sets an electric heating component in the enclosure layer, and by secondary heating the enclosure layer, the POE or TPO material can achieve an ideal transparent edge sealing effect. The independent secondary heating and melting can heat the enclosure layer material to a higher temperature, instantly soften the enclosure layer material without significantly affecting the dimming film, thereby avoiding the defects in water blocking function and appearance caused by insufficient melting of the enclosure layer POE or TPO due to low-temperature interlayer. The dimming glass prepared by this technical solution exhibits excellent water vapor / impurity barrier properties, extending the service life of the dimming glass, and at the same time ensuring that the area without dimming function at the edge of the dimming glass is small, expanding the application scenarios of the dimming glass. Summary of the invention

[0007] Based on the proposed dimming film and the method for preparing the dimming film, the inventor further improved the laminating process in the preparation process. By setting a retaining layer containing an electric heating component, POE or TPO materials with excellent water vapor barrier properties can be effectively introduced. While achieving excellent water vapor / impurity barrier properties, the area of ​​the dimming glass edge without dimming function is minimized, thereby improving the application performance of the dimming glass.

[0008] According to a first aspect of the present invention, there is provided a dimming glass, comprising: a first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4), a second transparent glass plate (5), and a blocking layer (6) located at least partially around the dimming film, wherein an electric heating component (6-1) is provided in the blocking layer (6).

[0009] Furthermore, the enclosure layer (6) forms a closed annular area along the edge of the switchable glass.

[0010] Furthermore, the barrier layer (6) is located between the first transparent glass plate (1) and the second transparent glass plate (5).

[0011] Furthermore, the sum of the layer widths of the enclosing layer (6) and the dimming film (3) is the same as the width of the first transparent glass plate (1) and the second transparent glass plate (5).

[0012] Furthermore, the barrier layer (6) is located between the first interlayer (2) and the second interlayer (4).

[0013] Furthermore, the sum of the layer widths of the barrier layer (6) and the dimming film (3) is substantially the same as the width of the first interlayer (2) and the second interlayer (4).

[0014] Furthermore, the retaining layer (6) comprises at least one of POE or TPO materials.

[0015] Furthermore, the barrier layer (6) comprises a material formed by a composite of POE or TPO and EVOH.

[0016] Furthermore, the enclosure layer (6) is a multi-layer concentric structure formed by a composite of POE or TPO and EVOH materials, which, from the inside to the outside, respectively comprises an electric heating component (6-1), an inner layer of POE or an inner layer of TPO (6-2), a middle layer of EVOH (6-3) and an outer layer of POE or an outer layer of TPO (6-4).

[0017] Furthermore, the thickness ratio of the multilayer concentric structure of the inner layer POE or inner layer TPO (6-2), the middle layer EVOH (6-3) and the outer layer POE or outer layer TPO (6-4) from inside to outside is 1:(0.5-1.5):(1-5).

[0018] Furthermore, the multi-layer concentric structure of the retaining layer (6) is prepared by a co-extrusion composite process.

[0019] Furthermore, the cross-section of the retaining layer (6) is a regular or irregular shape.

[0020] The width of the enclosure layer (6) has a significant effect on the water vapor / impurity barrier performance of the dimming glass. The larger the width of the enclosure layer, the better the water vapor / impurity barrier performance. This is in line with the general rules of film materials. However, considering that the larger the width of the enclosure layer, the larger the non-dimming area at the edge of the dimming glass, the application range of the dimming glass will be affected.

[0021] Furthermore, the width of the enclosure layer (6) is greater than 3 mm.

[0022] Furthermore, the width of the barrier layer (6) ranges from 3 mm to 20 mm.

[0023] Furthermore, the width of the barrier layer (6) ranges from 4 mm to 10 mm.

[0024] The width of the enclosure layer (6) may also be greater than 20 mm. In this case, the barrier performance against water vapor / impurities will be better, but the meaning of reducing the width of the non-dimming area is lost.

[0025] Furthermore, the electric heating component (6-1) in the enclosure layer (6) is electrically connected to an external power supply wire.

[0026] Furthermore, the haze of the corresponding area of ​​the barrier layer (6) is less than 10%.

[0027] Furthermore, the haze of the corresponding area of ​​the barrier layer (6) is less than 5%.

[0028] Furthermore, the power of the electric heating component (6-1) in the enclosure layer (6) can be sufficient to heat the enclosure layer (6) under the working voltage of the electric heating component (6-1), so that the temperature of the enclosure layer (6) reaches 160°C to 230°C and is maintained for 10 seconds to 20 minutes.

[0029] Furthermore, the power of the electric heating component (6-1) in the enclosure layer (6) can be sufficient to heat the enclosure layer (6) under the working voltage of the electric heating component (6-1), so that the temperature of the enclosure layer (6) reaches 170°C to 200°C and is maintained for 30 seconds to 5 minutes.

[0030] Furthermore, the electrical heating component (6-1) may be an electric heating wire or the like.

[0031] Furthermore, the dimming film (3) is selected from at least one of a suspended particle dimming film, a polymer dispersed liquid crystal dimming film or an electrochromic dimming film.

[0032] Furthermore, the dimming glass is applied to automobile window glass, skylight glass or glass curtain wall.

[0033] According to a second aspect of the present invention, there is provided a method for preparing a dimming glass, comprising stacking a first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4), a second transparent glass plate (5) and a blocking layer (6) located at least partially around the dimming film (3) in sequence, performing a interlayer treatment on the stacked multiple layers, electrically connecting an electric heating component (6-1) in the blocking layer (6) to an external power source, and starting the electric heating component (6-1) to heat the blocking layer (6) for a second time, thereby obtaining the dimming glass.

[0034] Furthermore, the temperature of the lamination treatment is 90°C to 120°C.

[0035] Furthermore, the secondary heating temperature reaches 160° C. to 230° C. and is maintained for 10 seconds to 20 minutes.

[0036] Furthermore, the secondary heating temperature reaches 170° C. to 200° C. and is maintained for 30 seconds to 5 minutes.

[0037] Furthermore, the temperature of the dimming glass is cooled to below 120° C. after the secondary heating to prevent the dimming performance from being adversely affected by the dimming glass being in a high temperature state for a long time.

[0038] Furthermore, after the secondary heating, the temperature of the switchable glass is rapidly cooled to below 100°C.

[0039] The rapid cooling of the dimming glass can place the dimming glass in a relatively low temperature environment as soon as possible, such as a refrigerator with a temperature below 0° C., or water with a temperature below 50° C.

[0040] In the present invention, there is no special restriction on the types of the first transparent glass plate (1) and the second transparent glass plate (5). They can be any conventional transparent glass for dimming glass known to those skilled in the art. They can be ordinary glass such as inorganic glass, organic glass, or functional glass such as UV blocking glass, IR blocking glass, Low-E glass, tempered glass or antibacterial glass, etc. They can also be selected from colored glass such as gray glass and brown glass.

[0041] In the present invention, the first interlayer (2) and the second interlayer (4) are not particularly limited and can be conventional adhesive films for dimming glass known to those skilled in the art, such as EVA films, TPU films or PVB films; they can also be functional films, such as UV-blocking EVA films, UV-blocking TPU films or UV-blocking PVB films, infrared-blocking EVA films, infrared-blocking TPU films or infrared-blocking PVB films; colored EVA films, TPU films or PVB films can also be selected.

[0042] In the present invention, the method for preparing the dimming glass is not particularly limited, and can be a conventional laminating method of dimming glass in the art, such as laminating in a laminator, or laminating in an autoclave or a laminating box / furnace.

[0043] In the present invention, the electric heating component (6-1) in the enclosure layer (6) can provide additional functions during the use of the dimming glass. For example, in actual use scenarios, the electric heating component (6-1) in the enclosure layer (6) can be activated to heat the dimming glass to achieve the functions of defrosting and snow melting; in actual use scenarios, the electric heating component (6-1) in the enclosure layer (6) can be activated to heat the dimming glass to achieve a better function of blocking water vapor.

[0044] Furthermore, by starting the electric heating component (6-1) in the enclosure layer (6), the temperature of the dimming glass is controlled to be within the ideal operating temperature range of 0°C to 30°C. The present invention can effectively perform secondary heating on the enclosure layer (6) of the dimming glass by providing the enclosure layer (6) with the electric heating component (6-1), so that the enclosure layer (6) material can be melted into glue at a higher temperature, better realize the sealing and water / impurity blocking function, and extend the service life of the dimming glass. At the same time, the area of ​​the dimming glass edge without the dimming function can be minimized, thereby increasing the application scenarios of the dimming glass.

[0045] In the present invention, after the electric heating component (6-1) in the enclosure layer (6) has heated the enclosure layer (6) for the second time, the electric heating component (6-1) can be taken out of the enclosure layer (6) when the enclosure layer (6) material is in a hot-melt state. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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 or the prior art descriptions are briefly introduced below. The drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work.

[0047] Figure 1 A schematic diagram of the structure of the enclosure layer provided by an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0051] Figure 5 A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0052] Among them, 1. first transparent glass plate, 2. first interlayer, 3. dimming film, 4. second interlayer, 5. second transparent glass plate, 6. enclosure layer, 6-1. electric heating component, 6-2. inner layer POE or inner layer TPO, 6-3. middle layer EVOH, 6-4. outer layer POE or outer layer TPO. DETAILED DESCRIPTION

[0053] the term

[0054] In the present invention, the following terms used have the meanings defined below.

[0055] Co-extrusion composite process:

[0056] A method for preparing a composite film by melting and plasticizing two or more different films through two or more extruders, feeding each film into a pair of die or merging the films fed by each extruder through a distributor and feeding them into the die. The different films mentioned here can be films of different types, films of the same type but different brands, or films of the same brand but different formulations.

[0057] The present invention tests the water vapor blocking effect of the dimming glass through a water boiling experiment.

[0058] Boiling test experiment:

[0059] After boiling the prepared dimming glass in 100℃ hot water for 72 hours, visually inspect whether there is any change in the appearance of the dimming glass. If the water vapor barrier effect is poor, it will be manifested as dimming failure areas of varying degrees around the dimming film. Use a ruler to measure the width of the dimming failure area. The larger the value of the dimming failure area width, the worse the water vapor barrier performance.

[0060] BYK's Haze-gard i was used to test the haze.

[0061] The light transmittance of the dimming glass product was measured using a LS116 light transmittance meter (Shenzhen Linshang Technology Co., Ltd.). When no voltage is applied (off state), the light transmittance of the dimming glass is marked as Toff = %; when the rated voltage is applied (on state), the light transmittance of the dimming glass is marked as Ton = %.

[0062] The present invention provides a dimming glass having a baffle layer provided with an electric heating component. After the usual lamination process is completed, the baffle layer material can be locally heated at a second high temperature by secondary heating to ensure the lamination effect of the baffle layer material. In this way, the sealing and water-blocking / impurity-blocking functions can be ensured while minimizing the area of ​​the edge of the dimming glass without the dimming function, thereby achieving the overall effect of extending the service life of the dimming glass and expanding its application scenarios.

[0063] In order to better illustrate the present invention, the following specific examples are provided.

[0064] Comparative Example 1 Preparation of dimming glass

[0065] The suspended particle dimming film was prepared according to the methods of Examples 5 and 7 in CN112882258A.

[0066] Ordinary organic glass is used as the first transparent glass plate and the second transparent glass plate, and EVA material is used as the first interlayer, the second interlayer and the barrier layer. The first transparent glass plate (1), the first interlayer (2), the dimming film (3), the second interlayer (4), the second transparent glass plate (5) and the barrier layer (6) are stacked in sequence, the width of the barrier layer is 20 mm, and the structure is shown in FIG. Figure 4 The dimming film is surrounded by retaining layers. The stacked layers are kept at 110° C. for 30 minutes in an autoclave for lamination treatment to obtain a dimming glass product comparative example 1. The test results are shown in Table 1.

[0067] Comparative Example 2 Preparation of dimming glass

[0068] The same as comparative example 1, except that PVB is used instead of EVA, to obtain a dimming glass product comparative example 2. The test results are shown in Table 1.

[0069] Comparative Example 3 Preparation of dimming glass

[0070] The same as comparative example 2, except that the width of the enclosure layer is 6 mm, obtains the dimming glass product comparative example 3, and the test results are shown in Table 1.

[0071] Example 1 Preparation of multi-layer concentric structure enclosure layer

[0072] The copper-nickel alloy resistance wire is co-extruded with POE, EVOH, and POE multi-layer concentric structure. The thickness ratio from inside to outside is 1:0.6:2.5. The width of the enclosure layer is 6 mm. The structure is shown in Figure 1 .

[0073] Example 2 Preparation of multi-layer concentric structure enclosure layer

[0074] The same as Example 1, except that TPO is used instead of POE, the thickness ratio from inside to outside is 1:1.2:4.0, and the width of the retaining layer is 9 mm.

[0075] Example 3 Preparation of multi-layer concentric structure enclosure layer

[0076] Same as Example 1, except that the thickness ratio from inside to outside is 1:1.0:2.0, and the width of the retaining layer is 10 mm.

[0077] Example 4 Preparation of multi-layer concentric structure enclosure layer

[0078] Same as Example 1, except that the thickness ratio from inside to outside is 1:1.5:5.0, and the width of the retaining layer is 3 mm.

[0079] Example 5 Preparation of barrier layer

[0080] The same as Example 1, except that POE is used to replace the POE, EVOH, POE multi-layer concentric structure material of Example 1.

[0081] Example 6 Preparation of barrier layer

[0082] Same as Example 5, except that TPO is used instead of POE.

[0083] Example 7 Preparation of dimming glass

[0084] The suspended particle dimming film was prepared according to the methods of Examples 5 and 7 in CN112882258A.

[0085] Ordinary organic glass is used as the first transparent glass plate and the second transparent glass plate, and PVB material is used as the first interlayer and the second interlayer. Figure 4 As shown, the dimming film is surrounded by a barrier layer. The first transparent glass plate (1), the first interlayer (2), the dimming film (3), the second interlayer (4), and the second transparent glass plate (5) are stacked in sequence. The barrier layer (6) prepared in Example 1 is arranged around the dimming film. The width of the barrier layer is 6 mm. The stacked multiple layers are kept at 110° C. in an autoclave for 30 minutes for interlayer treatment. Then, the electric heating component in the barrier layer (6) is electrically connected to an external power source, and the electric heating component is started to heat the barrier layer to 180° C. for 2 minutes. After that, the dimming glass is immediately placed in a refrigerator at 0° C. to cool down, thereby obtaining a dimming glass product 1. The test results are shown in Table 1.

[0086] Example 8 Preparation of dimming glass

[0087] The same as Example 7, except that ordinary white glass is used instead of ordinary organic glass, and the enclosure layer prepared in Example 2 is used instead of the enclosure layer prepared in Example 1. The width of the enclosure layer is 9 mm. The enclosure layer is heated to 190°C for a second time and maintained for 1 minute. Then, the dimming glass is immediately placed in a 20°C water tank for cooling to obtain a dimming glass product 2. The test results are shown in Table 1.

[0088] Example 9 Preparation of dimming glass

[0089] The same as Example 8, except that the baffle layer prepared in Example 3 is used instead of the baffle layer prepared in Example 2, the width of the baffle layer is 10 mm, the stacked multiple layers are laminated at 90°C, the baffle layer is heated to 200°C for a second time and maintained for 30 seconds, and then the dimming glass is immediately placed in a 20°C water tank for cooling to obtain a dimming glass product 3. The test results are shown in Table 1.

[0090] Example 10 Preparation of dimming glass

[0091] The same as Example 8, except that the baffle layer prepared in Example 4 is used instead of the baffle layer prepared in Example 2, the width of the baffle layer is 3 mm, the stacked multiple layers are laminated at 90°C, the baffle layer is heated to 200°C for a second time and maintained for 3 minutes, and then the dimming glass is immediately placed in a 20°C water tank for cooling to obtain a dimming glass product 4. The test results are shown in Table 1.

[0092] Example 11 Preparation of dimming glass

[0093] The same as Example 7, except that the barrier layer prepared in Example 5 is used instead of the barrier layer prepared in Example 1, and the width of the barrier layer is 6 mm, to obtain a dimming glass product 5. The test results are shown in Table 1.

[0094] Example 12 Preparation of dimming glass

[0095] The same as Example 7, except that the barrier layer prepared in Example 6 is used instead of the barrier layer prepared in Example 1, and the width of the barrier layer is 6 mm, to obtain a dimming glass product 6. The test results are shown in Table 1.

[0096] Example 13 Preparation of dimming glass

[0097] The same as Example 12, the width of the enclosure layer is 6 mm, and the lamination temperature is changed to 140° C. without the second heating, to obtain a dimming glass product 7. The test results are shown in Table 1.

[0098] Example 14 Preparation of dimming glass

[0099] The same as Example 7, the width of the baffle layer is 6 mm, but the baffle layer is not subjected to secondary heating, to obtain a dimming glass product 8. The test results are shown in Table 1.

[0100] Table 1 Preparation parameters of dimming glass and test results of boiling water experiment

[0101]

[0102] Note: X indicates not applicable, * indicates the dimming glass with haze data has no secondary heating process.

[0103] First, it can be seen from the data in Table 1 that when the width of the enclosing layer is also 6 mm, after the boiling water test, the width of the edge failure zone of the dimming film in Example 7, Example 11, and Example 12 is ≤1 mm, while the width of the edge failure zone of the dimming film in Comparative Example 3 is 7 mm after the boiling water test. It can be clearly seen that the technical solution of the enclosing layer of the present application being POE or TPO material has a good sealing function, which can effectively prevent water vapor / impurities from invading the interior of the dimming glass, extend the service life of the dimming glass, and minimize the area of ​​the edge of the dimming glass without dimming function.

[0104] Secondly, by comparing the haze of the enclosing layer before and after the secondary heating in Table 1, it can be seen that after the secondary heating, the haze of the enclosing layer, that is, the edge of the dimming glass, is significantly reduced. Taking the product test results of Example 11 as an example, the haze of the enclosing layer before the secondary heating is 28.0%, and after the secondary heating, it is reduced to 2.4%, indicating that the transparency at the edge of the dimming glass is greatly improved, so the product has a good appearance effect.

[0105] Again, from the test results of Example 13, it can be seen that if the interlayer temperature is increased to 140°C at one time, although the haze of the barrier layer can be reduced to 3.0%, the Ton% is also reduced to 35.1%, that is, the one-time use of high-temperature interlayer will have a great negative impact on the dimming performance of the dimming glass. This also proves the necessity of the secondary heating process step for the barrier layer.

[0106] Finally, by comparing the test results of Example 14 and Example 7, it can be seen that if a barrier layer of POE / EVOH / POE material is set but no secondary heating is performed, the water vapor barrier property of the dimming glass is inferior to that of the corresponding product that has undergone secondary heating, but is still better than the dimming glass product of Comparative Example 3 that uses a barrier layer of PVB material.

[0107] The above results intuitively illustrate that the adoption of this solution can improve the sealing and water / impurity blocking functions of the dimming glass product, while minimizing the area of ​​the dimming glass edge without dimming function, reducing the haze of the edge area, optimizing the appearance of the dimming glass product, extending its service life, and expanding its application scenarios.

[0108] The description of the above embodiments is only used to help understand the method of the present invention and its core idea. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A dimming glass, characterized in that: include: A first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4), a second transparent glass plate (5) and a blocking layer (6) located at least partially around the dimming film are stacked in sequence, wherein an electric heating component (6-1) is provided in the blocking layer (6).

2. The dimming glass according to claim 1, characterized in that: The enclosure layer (6) forms a closed annular area along the edge of the dimming glass.

3. The switchable glass according to claim 1, characterized in that: The barrier layer (6) is located between the first transparent glass plate (1) and the second transparent glass plate (5).

4. The switchable glass according to claim 1, characterized in that: The barrier layer (6) is located between the first interlayer (2) and the second interlayer (4).

5. The switchable glass according to claim 1, characterized in that: The barrier layer (6) comprises at least one of POE and TPO materials.

6. The switchable glass according to claim 1, characterized in that: The enclosure layer (6) comprises a multi-layer concentric structure formed by a composite of POE or TPO and EVOH materials, which comprises, from the inside to the outside, an electric heating component (6-1), an inner layer of POE or an inner layer of TPO (6-2), a middle layer of EVOH (6-3) and an outer layer of POE or an outer layer of TPO (6-4).

7. The switchable glass according to claim 6, characterized in that: The multi-layer concentric structure is prepared by a co-extrusion composite process.

8. The switchable glass according to claim 1, characterized in that: The cross section of the enclosure layer (6) is regular or irregular in shape.

9. The switchable glass according to claim 1, characterized in that: The width of the barrier layer (6) ranges from 3 mm to 20 mm.

10. The switchable glass according to claim 1, characterized in that: The electric heating component (6-1) in the enclosure layer (6) is electrically connected to an external power supply wire.

11. The switchable glass according to claim 1, characterized in that: The haze of the corresponding area of ​​the barrier layer (6) is less than 10%.

12. The switchable glass according to claim 1, characterized in that: The dimming film (3) is selected from at least one of a suspended particle dimming film, a polymer dispersed liquid crystal dimming film or an electrochromic dimming film.

13. The switchable glass according to claim 1, characterized in that: The dimming glass is applied to automobile window glass, skylight glass or glass curtain wall.

14. A method for preparing dimming glass, characterized in that: A first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4), a second transparent glass plate (5) and a blocking layer (6) located at least partially around the dimming film are stacked in sequence, the stacked layers are subjected to a interlayer treatment, an electric heating component (6-1) in the blocking layer (6) is electrically connected to an external power source, and the electric heating component is started to heat the blocking layer (6) for a second time, thereby obtaining dimming glass.

15. The method for preparing dimming glass according to claim 14, characterized in that: The temperature of the lamination treatment is 90°C to 120°C.

16. The method for preparing dimming glass according to claim 14, characterized in that: The secondary heating temperature reaches 160° C. to 230° C. and is maintained for 10 seconds to 20 minutes.

17. The method for preparing the dimming glass according to claim 14, characterized in that: After the secondary heating, the temperature of the dimming glass is cooled to below 120°C.

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