Dimming glass and preparation method thereof

Abstract

The invention provides dimming glass with an electric heating component arranged in a laminated layer and a preparation method of the dimming glass. The laminated layer is secondarily heated by the electric heating component arranged in the laminated layer, so that the POE or TPO material with better water vapor / impurity barrier property and higher melting temperature requirement can become the laminated layer material of the dimming glass. According to the design scheme, the sealing function of the laminated layer material 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 is increased.

Description

Technical Field

[0001] The present invention relates to the field of electronic light-controlling materials, and in particular to a dimming glass and a preparation method thereof. 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-blocking performance of PVB or EVA film is poor, which makes the dimming film at the edge of the dimming glass easily affected by water vapor 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, the intrusion of water vapor is blocked, 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 has 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 the 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 interlayer fails to melt completely, resulting in large haze and poor transparency of the dimming glass, which seriously affects the product appearance and dimming effect.

[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 prevent the performance degradation and failure of the dimming film around the dimming glass due to the invasion of water vapor / impurities in the environment.

[0006] The present invention sets an electric heating component in the interlayer, and by heating the interlayer twice, the POE or TPO material in the interlayer can achieve an ideal transparent effect. By adopting independent secondary heating and melting, the interlayer material can be heated to a higher temperature, and the interlayer material can be softened instantly without obvious impact on the dimming film, thereby avoiding the defects in water blocking function and appearance caused by insufficient melting of the POE or TPO material in the interlayer during the low-temperature interlayer process. The dimming glass prepared by this technical solution can show excellent water vapor / impurity barrier performance, extend the service life of the dimming glass product, and at the same time ensure 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] On the basis of proposing a dimming film and a method for preparing the dimming film, the inventors further improved the lamination process in the preparation process. By setting an electric heating component in the interlayer, POE or TPO materials with excellent water vapor barrier properties but high melting temperature requirements can be introduced as the interlayer. While achieving excellent water vapor / impurity barrier properties, the area of ​​the edge of the dimming glass without dimming function is minimized, thereby improving the application performance of the dimming glass.

[0008] A first aspect of the present invention provides a dimming glass, comprising: a first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4) and a second transparent glass plate (5) stacked in sequence, wherein an electric heating component (6) is provided in the first interlayer (2) and / or the second interlayer (4).

[0009] Furthermore, the first interlayer (2) and / or the second interlayer (4) comprises at least one of POE or TPO materials.

[0010] Furthermore, the thickness of the first interlayer (2) and / or the second interlayer (4) is 0.1 mm to 2 mm.

[0011] 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.

[0012] Furthermore, the first transparent glass plate (1) and the second transparent glass plate (5) have substantially the same size, the dimming film (3) has a smaller size than the first transparent glass plate (1) and the second transparent glass plate (5), and at least a portion of the dimming film (3) has an overlap region with corresponding positions of the first transparent glass plate (1) and the second transparent glass plate (5), the overlap region having an overlap difference denoted by d, and d is between 1 mm and 20 mm.

[0013] Furthermore, the sizes of the first interlayer (2) and the second interlayer (4) are substantially the same as or larger than the size of the dimming film (3); the sizes of the first interlayer (2) and the second interlayer (4) are substantially the same as or smaller than the sizes of the first transparent glass plate (1) and the second transparent glass plate (5); at least a portion of the dimming film (3) and the first transparent glass plate (1) and the second transparent glass plate (5), or the first interlayer (2) and the second interlayer (4) have an overlap region, and the overlap region is represented by d, and d is between 1 mm and 20 mm.

[0014] Furthermore, the sizes of the first interlayer (2) and the second interlayer (4) are substantially the same as the sizes of the dimming film (3) or substantially the same as the sizes of the first transparent glass plate (1) and the second transparent glass plate (5), and there is an overlap area between at least a portion of the dimming film (3) and the corresponding positions of the first interlayer (2) and the second interlayer (4), and the overlap of the overlap area is represented by d, and d is between 1 mm and 20 mm.

[0015] Furthermore, the sizes of the first interlayer (2) and the second interlayer (4) are substantially the same as the sizes of the first transparent glass plate (1) and the second transparent glass plate (5), and there is an overlap area between at least a portion of the dimming film (3) and the corresponding positions of the first interlayer (2) and the second interlayer (4), and the overlap of the overlap area is represented by d, and d is between 1 mm and 20 mm.

[0016] Furthermore, the d is between 5 mm and 10 mm.

[0017] The width of the overlap area has a significant impact on the water vapor / impurity barrier performance of the dimming glass. The larger the width of the overlap area, the better the water vapor / impurity barrier performance, which is in line with the general rules of film materials. However, considering that the larger the width of the overlap area, the larger the non-dimming area at the edge of the dimming glass, it will affect the application range of the dimming glass.

[0018] The d may also be greater than 20 mm, in which case the barrier performance against water vapor / impurities will be better, but the meaning of reducing the width of the non-dimming zone is lost.

[0019] Furthermore, the overlap area forms a closed annular area along the edge of the switchable glass.

[0020] Furthermore, the overlap region is provided with an edge sealing layer (7), and the edge sealing layer (7) comprises at least one of POE and TPO materials.

[0021] Furthermore, an electric heating component (6) is provided in the edge sealing layer (7).

[0022] In the present invention, when d is less than 5 mm, no edge sealing layer is required; when d is between 5 mm and 20 mm, an edge sealing layer is preferably used to prevent the glass edge from being damaged due to thickness difference during the lamination process of making dimming glass.

[0023] Furthermore, the width of the edge sealing layer (7) is substantially the same as d.

[0024] Furthermore, the width of the edge sealing layer (7) ranges from 1 mm to 20 mm.

[0025] Furthermore, the width of the edge sealing layer (7) is in the range of 5 mm to 10 mm.

[0026] Furthermore, the thickness of the edge sealing layer (7) is substantially the same as the height of the overlap area.

[0027] Furthermore, the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) comprises a material formed by a composite of POE or TPO and EVOH.

[0028] Furthermore, the material formed by the composite of POE or TPO and EVOH is a three-layer concentric structure formed by the composite of POE or TPO and EVOH, and the three-layer concentric structure comprises, from inside to outside, an inner layer of POE or an inner layer of TPO, a middle layer of EVOH and an outer layer of POE or an outer layer of TPO, wherein the electric heating component (6) is embedded inside the three-layer concentric structure.

[0029] Furthermore, the number of the electric heating components (6) is one or more.

[0030] Furthermore, the electric heating component (6) is embedded in the inner POE layer or the inner TPO layer.

[0031] Furthermore, the thickness ratio of the three-layer concentric structure from inside to outside is 1:(0.5-1.5):(1-5).

[0032] Furthermore, the three-layer concentric structure is prepared by a co-extrusion composite process.

[0033] Furthermore, the electric heating component (6) is electrically connected to an external power supply wire.

[0034] Furthermore, the power of the electric heating component (6) can be sufficient to heat the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) at the working voltage of the electric heating component (6) to a temperature of 160° C. to 230° C. and maintain the temperature for 10 seconds to 20 minutes.

[0035] Furthermore, the power of the electric heating component (6) can be sufficient to heat the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) at the working voltage of the electric heating component (6) to a temperature of 170° C. to 200° C. for 30 seconds to 5 minutes.

[0036] Furthermore, the electric heating component (6) may be an electric heating wire or the like.

[0037] Furthermore, the haze of the switchable glass in an on state is less than 10%.

[0038] Furthermore, the haze of the switchable glass in an on state is less than 5%.

[0039] Furthermore, the dimming glass is applied to automobile window glass, skylight glass or glass curtain wall.

[0040] A second aspect of the present invention provides a method for preparing dimming glass, comprising:

[0041] A first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4) and a second transparent glass plate (5) are stacked in sequence, wherein the first interlayer (2) and / or the second interlayer (4) are provided with an electric heating component (6), and then the stacked multiple layers are subjected to a lamination process, and then the electric heating component (6) is electrically connected to an external power supply wire and electrically connected to an external power supply, and the electric heating component (6) is started to secondary heat the first interlayer (2) and / or the second interlayer (4), thereby obtaining dimming glass.

[0042] Furthermore, 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 an edge sealing layer (7) are stacked in sequence, wherein an electric heating component (6) is provided in the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7), and then the stacked multiple layers are subjected to a lamination process, and then the electric heating component (6) is electrically connected to an external power supply wire and electrically connected to an external power supply, and the electric heating component (6) is started to heat the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) for a second time, thereby obtaining a dimming glass.

[0043] Furthermore, the temperature of the lamination treatment is 90°C to 120°C.

[0044] Furthermore, the secondary heating temperature reaches 160° C. to 230° C. and is maintained for 10 seconds to 20 minutes.

[0045] Furthermore, the secondary heating temperature reaches 170° C. to 200° C. and is maintained for 30 seconds to 5 minutes.

[0046] Furthermore, after the secondary heating, the temperature of the dimming glass is quickly cooled to below 120° C. to prevent the dimming performance from being adversely affected by the dimming glass being in a high temperature state for a long time.

[0047] Furthermore, after the secondary heating, the temperature of the switchable glass is rapidly cooled to below 100°C.

[0048] 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.

[0049] 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.

[0050] In the present invention, the method for manufacturing the dimming glass is not particularly limited, and can be a conventional laminating method of dimming glass components in the art, such as laminating in a laminator, or laminating in an autoclave or a laminating box / furnace.

[0051] In the present invention, the electric heating component (6) in the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) can provide additional functions during the use of the dimming glass. For example, in actual use scenarios, the electric heating component (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) can be activated to heat the dimming glass to achieve a better function of blocking water vapor.

[0052] Furthermore, by starting the electric heating component (6), the temperature of the heated dimming glass is controlled to be within an ideal operating temperature range of 0°C to 30°C.

[0053] The present invention can effectively perform secondary heating on the interlayer of the dimming glass by arranging an electric heating component (6) in the interlayer, and / or by arranging an edge sealing layer having the electric heating component (6), or can enable the edge sealing layer material to be melted at a higher temperature by secondary heating, thereby better achieving the sealing and water / impurity blocking functions and extending the service life of the product. 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.

[0054] In the present invention, after the electric heating component (6) in the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) is heated for the second time, the electric heating component (6) can be taken out of the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) when the materials of the first interlayer (2) and / or the second interlayer (4) and / or the edge sealing layer (7) are in a hot-melt state. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] 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.

[0056] Figure 1 A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0057] Figure 2 A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0058] Figure 3 A schematic diagram of a multi-layer material structure of an edge-sealing layer and an interlayer provided in an embodiment of the present invention;

[0059] Figure 4A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0060] Figure 5 A schematic diagram of the structure of the dimming glass provided by an embodiment of the present invention;

[0061] Among them, 1. first transparent glass plate, 2. first interlayer, 3. dimming film, 4. second interlayer, 5. second transparent glass plate, 6. electric heating component, 6-1. inner layer POE or inner layer TPO, 6-2. middle layer EVOH, 6-3. outer layer POE or outer layer TPO, 7. edge sealing layer, d. overlap. DETAILED DESCRIPTION

[0062] the term

[0063] In the present invention, the following terms used have the meanings defined below.

[0064] Co-extrusion composite process:

[0065] 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.

[0066] The present invention tests the water vapor blocking effect of the dimming glass through a water boiling experiment.

[0067] Boiling test experiment:

[0068] After boiling the prepared dimming glass in 100℃ hot water for 85 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 different degrees of dimming failure areas 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.

[0069] BYK's Haze-gard i was used to test the haze.

[0070] 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 = %.

[0071] The present invention provides a dimming glass, wherein an interlayer with an electric heating component and / or an edge sealing layer with an electric heating component are provided. After the usual lamination process is completed, the interlayer layer / edge sealing layer material can be locally heated at a high temperature for a second time in the form of secondary heating to ensure the sealing effect at the edge. In this way, the edge area of ​​the region without the dimming function can be minimized while ensuring the water / impurity blocking function, thereby achieving the overall effect of extending the service life of the dimming glass and expanding its application scenarios.

[0072] In order to better illustrate the present invention, the following specific examples are provided.

[0073] Comparative Example 1 Preparation of dimming glass

[0074] The suspended particle dimming film was prepared according to the methods of Examples 5 and 7 in CN112882258A.

[0075] 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 edge sealing 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 edge sealing layer (7) are stacked in sequence, with a stacking difference d of 20 mm. A 20 mm wide EVA edge sealing layer is arranged in the stacking difference area. The structure is shown in FIG. Figure 2 and Figure 4 (b) Edge sealing layers are arranged around the dimming film. 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.

[0076] Comparative Example 2 Preparation of dimming glass

[0077] 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.

[0078] Comparative Example 3 Preparation of dimming glass

[0079] The same as comparative example 2, except that the overlap difference d is 6 mm, is used to obtain a dimming glass product comparative example 3. The test results are shown in Table 1.

[0080] Example 1 Preparation of a three-layer concentric structure containing an electric heating element

[0081] Interlayer material:

[0082] The copper-nickel alloy resistance wire is combined with POE, EVOH and POE in a three-layer concentric structure through a co-extrusion composite process. Figure 3 The thickness ratio from inside to outside is 1:0.6:2.5, the thickness is 0.76 mm, co-extruded, and the interval width of the electric heating components is 10 mm.

[0083] Edge banding material: Same as the interlayer material, but only contains one electric heating component with a width of 6 mm.

[0084] Example 2 Preparation of a three-layer concentric structure containing an electric heating element

[0085] 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 thickness is 0.38 mm.

[0086] Edge banding material: Same as the interlayer material, but only contains one electric heating component with a width of 10 mm.

[0087] Example 3 Preparation of a three-layer concentric structure containing an electric heating element

[0088] Same as Example 1, except that the thickness ratio from inside to outside is 1:1.0:2.0, and the thickness is 1.1 mm.

[0089] Edge banding material: Same as the interlayer material, but only contains one electric heating component with a width of 5 mm.

[0090] Example 4 Preparation of a three-layer concentric structure containing an electric heating element

[0091] Same as Example 1, except that the thickness ratio from inside to outside is 1:1.5:5.0, and the thickness is 0.38 mm.

[0092] Edge banding material: Same as the interlayer material, but only contains one electric heating component with a width of 3 mm.

[0093] Example 5 Preparation of POE materials containing electric heating components

[0094] The same as Example 1, except that POE is used to replace the three-layer concentric structure material of POE, EVOH, and POE in Example 1.

[0095] Edge banding material: Same as the interlayer material, but only contains one electric heating component with a width of 6 mm.

[0096] Example 6 Preparation of TPO material containing electric heating components

[0097] Same as Example 5, except that TPO is used instead of POE.

[0098] Edge banding material: Same as the interlayer material, but only contains one electric heating component with a width of 6 mm.

[0099] Example 7 Preparation of dimming glass

[0100] The suspended particle dimming film was prepared according to the methods of Examples 5 and 7 in CN112882258A.

[0101] Ordinary organic glass is used as the first transparent glass plate and the second transparent glass plate, the three-layer concentric structure material containing the electric heating component prepared in Example 1 is used as the first interlayer and the second interlayer, and the three-layer concentric structure material containing the electric heating component prepared in Example 1 is used as the edge sealing layer, the overlap d is 6 mm, and the overlap area is set to 6 mm wide. The three-layer concentric structure edge sealing layer material containing the electric heating component prepared in Example 1 is as follows. Figure 4 As shown in (b), the dimming film is provided with edge sealing layers all around, the first transparent glass plate, the first interlayer, the dimming film, the second interlayer, the second transparent glass plate, and the edge sealing layer are stacked in sequence, the stacked multiple layers are kept at 110°C in an autoclave for 30 minutes for lamination treatment, then the electric heating components in the first interlayer, the second interlayer and the edge sealing layer are electrically connected to an external power source, the electric heating components are started to secondary heat the first interlayer, the second interlayer and the edge sealing layer to 180°C, and maintained for 2 minutes, and then the dimming glass is immediately placed in a refrigerator at 0°C for cooling, to obtain a dimming glass product 1, and the test results are shown in Table 1.

[0102] Example 8 Preparation of dimming glass

[0103] Same as Example 7, except that ordinary white glass is used instead of ordinary organic glass, and the material prepared in Example 2 is used instead of the material prepared in Example 1, the overlap d is 10 mm, and the overlap area is set to 10 mm wide. The three-layer concentric structure edge sealing layer material containing the electric heating component prepared in Example 2 is as follows Figure 5 As shown in (b), the dimming film is provided with edge sealing layers on all sides, and 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.

[0104] Example 9 Preparation of dimming glass

[0105] The same as Example 7, except that the material prepared in Example 3 is used instead of the material prepared in Example 1, the overlap d is 5 mm, and the overlap area is set to 5 mm wide. The three-layer concentric structure edge sealing layer material containing the electric heating component prepared in Example 3 is laminated at 90°C, heated to 200°C for the second time, and maintained for 30 seconds. Thereafter, the dimming glass is immediately placed in a 20°C water tank for cooling to obtain the dimming glass product 3. The test results are shown in Table 1.

[0106] Example 10 Preparation of dimming glass

[0107] The same as Example 7, except that the material prepared in Example 4 is used instead of the material prepared in Example 1, the overlap d is 3 mm, and the overlap area is set to 3 mm wide. The three-layer concentric structure edge sealing layer material containing the electric heating component prepared in Example 4 is laminated at 100°C, heated to 200°C for the second time, and maintained for 3 minutes. 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.

[0108] Example 11 Preparation of dimming glass

[0109] The same as Example 7, except that the material prepared in Example 5 is used instead of the material prepared in Example 1, the overlap d is 6 mm, and the overlap area is set to be 6 mm wide. The POE material containing the electric heating component prepared in Example 5 has no secondary heating process, and a dimming glass product 5 is obtained. The test results are shown in Table 1.

[0110] Example 12 Preparation of dimming glass

[0111] The same as Example 11, except that the material prepared in Example 6 is used instead of the material prepared in Example 5, the overlap d is 6 mm, and the overlap area is set to be 6 mm wide. The TPO material containing the electric heating component prepared in Example 6 has no secondary heating process, and a dimming glass product 6 is obtained. The test results are shown in Table 1.

[0112] Example 13 Preparation of dimming glass

[0113] The same as Example 12, except that the laminating temperature is changed to 140° C. and no secondary heating is performed, to obtain a dimming glass product 7. The test results are shown in Table 1.

[0114] Example 14 Preparation of dimming glass

[0115] The same as Example 7, except that the first interlayer, the second interlayer and the edge sealing layer are not subjected to secondary heating, to obtain a dimming glass product 8. The test results are shown in Table 1.

[0116] Example 15 Preparation of dimming glass

[0117] The same as Example 11, except that a secondary heating process is added, the secondary heating is performed to 200° C. 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 9. The test results are shown in Table 1.

[0118] First, it can be seen from the data in Table 1 that when the width of the edge sealing layer is 10mm, the width of the failure zone of the edge of the dimming film of Example 8 after the water boiling test is 0mm, while the dimming glass of Comparative Examples 1 and 2 has a 20mm width of the edge sealing layer, but the width of the failure zone of the edge of the dimming film is larger, which is 3mm after the water boiling test. It can be clearly seen that the technical solution of the application that the edge sealing layer includes POE or TPO material superimposed with the secondary heating function of the electric heating component 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 dimming glass edge without dimming function.

[0119] Table 1 Preparation parameters of dimming glass and test results of boiling water experiment

[0120]

[0121] Note: X indicates not applicable, * indicates the dimming glass with haze data has no secondary heating process.

[0122] Secondly, by comparing the haze of the dimming glass before and after the secondary heating of Example 7, Example 8, Example 9, and Example 10 in Table 1, it can be seen that after the secondary heating, the haze of the dimming glass is significantly reduced. Taking the product test results of Example 10 as an example, the haze of the dimming glass before the secondary heating is 38.2%, and it is reduced to 4.2% after the secondary heating, indicating that the transparency of the dimming glass is significantly improved, so the product has good dimming performance. Comparing Example 7 with Example 14, it can be seen that the Ton of the dimming glass of Example 14 is only 20.6%. Since there is no secondary heating process, the haze of the dimming glass is large, resulting in low transmittance. Comparing Example 11 with Example 15, it can be seen that the Ton of the dimming glass of Example 11 is only 33.5%. This is because there is no secondary heating process, the haze of the dimming glass is large, resulting in low transmittance. It can be clearly seen from the above results that it is necessary to provide an electric heating component in the first interlayer and / or the second interlayer of the present application and use it for secondary heating.

[0123] 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 dimming glass can be reduced to 4.0%, the Ton% is also reduced to 35.7%, 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 of the interlayer.

[0124] Finally, from the comparison of the test results of Example 14 and Example 7, it can be seen that the first interlayer, second interlayer and edge sealing layer of POE / EVOH / POE material are all provided but no secondary heating is performed, and the water vapor barrier property of the dimming glass (failure width 1mm, Example 14) is inferior to the corresponding product with secondary heating (failure width 0.5mm, Example 7), but it is still significantly better than the dimming glass product with PVB material edge sealing layer (although the edge sealing layer width is large, the failure width is larger, which is 3mm, Comparative Example 1). It can be clearly seen that it is necessary to provide an electric heating component in the first interlayer and / or the second interlayer and / or the edge sealing layer of the present application and use it for secondary heating.

[0125] 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: The invention comprises a first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4) and a second transparent glass plate (5) which are stacked in sequence, wherein an electric heating component (6) is arranged in the first interlayer (2) and / or the second interlayer (4).

2. The dimming glass according to claim 1, characterized in that: The first interlayer (2) and / or the second interlayer (4) comprises at least one of POE and TPO materials.

3. 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.

4. The switchable glass according to claim 1, characterized in that: The first transparent glass plate (1) and the second transparent glass plate (5) have substantially the same size, the dimming film (3) has a smaller size than the first transparent glass plate (1) and the second transparent glass plate (5), at least a portion of the dimming film (3) has an overlap region with corresponding positions of the first transparent glass plate (1) and the second transparent glass plate (5), the overlap region having an overlap difference denoted by d, and d is between 1 mm and 20 mm.

5. The switchable glass according to claim 4, characterized in that: The overlapping area forms a closed annular area along the edge of the switchable glass.

6. The switchable glass according to claim 4, characterized in that: The overlap region is provided with an edge sealing layer (7), and the edge sealing layer (7) comprises at least one of POE and TPO materials.

7. The switchable glass according to claim 6, characterized in that: An electric heating component (6) is provided in the edge sealing layer (7).

8. The dimming glass according to any one of claims 2 and 6, characterized in that: The POE or TPO material is a three-layer concentric structure formed by compounding POE or TPO and EVOH, wherein the three-layer concentric structure comprises, from inside to outside, an inner layer of POE or inner layer of TPO, a middle layer of EVOH and an outer layer of POE or outer layer of TPO, wherein the electric heating component (6) is embedded inside the three-layer concentric structure.

9. The switchable glass according to claim 8, characterized in that: The three-layer concentric structure is prepared by a co-extrusion composite process.

10. The switchable glass according to any one of claims 1 and 7, characterized in that: The electric heating component (6) is electrically connected to an external power supply wire.

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

12. A method for preparing dimming glass, characterized in that: include: A first transparent glass plate (1), a first interlayer (2), a dimming film (3), a second interlayer (4) and a second transparent glass plate (5) are stacked in sequence, wherein the first interlayer (2) and / or the second interlayer (4) are provided with an electric heating component (6), and then the stacked multiple layers are subjected to a lamination process, and then the electric heating component (6) is electrically connected to an external power supply wire and electrically connected to an external power supply, and the electric heating component (6) is started to secondary heat the first interlayer (2) and / or the second interlayer (4), thereby obtaining dimming glass.

13. The method for preparing dimming glass according to claim 12, 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 an edge sealing layer (7) are stacked in sequence, wherein an electric heating component (6) is provided in the first interlayer (2) and / or the second interlayer (4) and the edge sealing layer (7), and the electric heating component (6) is activated to secondary heat the first interlayer (2) and / or the second interlayer (4) and the edge sealing layer (7).

14. The method for preparing dimming glass according to claim 12, characterized in that: The temperature of the lamination treatment is 90°C to 120°C.

15. The method for preparing the dimming glass according to any one of claims 12 and 13, characterized in that: The secondary heating temperature reaches 160° C. to 230° C. and is maintained for 10 seconds to 20 minutes.

16. The method for preparing the dimming glass according to any one of claims 12 and 13, characterized in that: After the secondary heating, the temperature of the dimming glass is cooled to below 120°C.

Images