CN117233996A - Liquid crystal dimming glass with asymmetric structure - Google Patents
Liquid crystal dimming glass with asymmetric structure Download PDFInfo
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- CN117233996A CN117233996A CN202311054015.1A CN202311054015A CN117233996A CN 117233996 A CN117233996 A CN 117233996A CN 202311054015 A CN202311054015 A CN 202311054015A CN 117233996 A CN117233996 A CN 117233996A
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- 239000011521 glass Substances 0.000 title claims abstract description 82
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 48
- 239000000758 substrate Substances 0.000 claims abstract description 82
- 239000000463 material Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 3
- 229920000554 ionomer Polymers 0.000 claims description 2
- 238000003475 lamination Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 8
- 238000004220 aggregation Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 abstract description 4
- 238000010030 laminating Methods 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 121
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000005341 toughened glass Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000005340 laminated glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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Abstract
The invention discloses an asymmetric structure liquid crystal dimming glass which comprises a first transparent substrate, a first film layer, a dimming film layer, a second film layer and a second transparent substrate which are laminated and adhered and fixed, wherein the thickness of the first transparent substrate plus the first film layer is necessarily smaller than that of the second transparent substrate plus the second film layer, so that the film layers and the substrates on two sides of the dimming film layer are ensured to be of an asymmetric structure, stress fields of the dimming film layer after a high-temperature high-pressure film laminating process can be in asymmetric distribution, the stress is released after the dimming film layer returns to room temperature, residual stress is reduced, the residual stress of the dimming film layer is obviously lower than that of the traditional liquid crystal dimming glass in a symmetrical structure, liquid crystal aggregation in the dimming film layer is avoided, and the problem of uneven color after lamination and lamination is effectively solved.
Description
Technical Field
The invention relates to the technical field of dimming glass, in particular to liquid crystal dimming glass with an asymmetric structure.
Background
Currently, light-adjusting glass is applied to the fields of buildings, vehicles and the like, and the light-adjusting glass can change the light transmittance, so that the change between a dark state and a bright state is achieved. At present, the traditional dimming glass production mode is to clamp a liquid crystal dimming film between two pieces of glass through a film layer for packaging. As shown in fig. 1, the thicknesses of the two pieces of glass are generally equal, that is, the thicknesses of the film layers between the two pieces of glass and the liquid crystal dimming film are also generally equal, that is, a symmetrical structure design is adopted, in the symmetrical structure design, the liquid crystal dimming film is taken as a symmetrical plane, and the thicknesses of the film layers on two sides of the liquid crystal dimming film are consistent or close to each other. In the conventional dimming glass lamination process, a necessary step is to subject to a high-pressure and high-temperature environment, and the film layer melts and flows in the environment, so that the liquid crystal in the liquid crystal dimming film moves. When the film layer is cooled and solidified, obvious residual stress is formed due to the obvious difference of thermal expansion coefficients among the liquid crystal dimming film, the film layer and the glass. Such stress makes the flowing liquid crystal not completely return to its original position, resulting in the liquid crystal being gathered in some areas where the stress is highly uneven, thereby causing color unevenness of the light adjusting film. As shown in fig. 2, the light-adjusting glass adopting the symmetrical structure design generates the phenomenon of color aggregation or uneven color, and the light-adjusting glass can form a relatively symmetrical stress field during lamination, so that residual stress is difficult to release effectively. In addition, most of the existing light-adjusting glass uses relatively thick glass, such as 1.85mm or 2.1mm, when the bonding sheet is clamped, and the glass is unfavorable for releasing residual stress due to high rigidity, so that the phenomenon of uneven color is easy to occur.
Disclosure of Invention
The invention mainly aims to provide liquid crystal dimming glass with an asymmetric structure, and aims to solve the technical problem that the color of the existing dimming glass is uneven in a laminating process.
In order to achieve the above purpose, the invention provides an asymmetric structure liquid crystal dimming glass, which comprises a first transparent substrate, a first film layer, a dimming film layer, a second film layer and a second transparent substrate which are laminated and fixed, wherein the thickness of the first transparent substrate is less than or equal to 60% of the thickness of the second transparent substrate, and the thickness range of the first transparent substrate is 0.15 mm-1.3 mm. Preferably, the thickness of the first transparent substrate plus the first film layer must be smaller than the thickness of the second transparent substrate plus the second film layer. The first transparent substrate and the second transparent substrate may be selected from glass or flexible transparent optical materials such as PC, PET, etc.
Further, the thickness of the second film layer is greater than or equal to the thickness of the first film layer.
Further, the thickness of the first film layer ranges from 0.15mm to 1.6mm, and the thickness of the second film layer ranges from 0.3mm to 2.5mm.
Further, the thickness of the second transparent substrate ranges from 1.5mm to 3mm.
Further, the second film layer is formed by overlapping a plurality of third film layers with the same layer thickness. The first film layer may be formed by stacking a plurality of third film layers with the same layer thickness, but the number of stacked second film layers is larger than that of stacked first film layers, and the thicknesses of the first film layer and the second film layer are adjusted by controlling the number of the third film layers.
Further, the first film layer and the second film layer are interchangeable in position.
Further, the first transparent substrate and the second transparent substrate are glass layers or flexible transparent optical material transparent layers.
Further, the first film layer and the second film layer are one or more of EVA, PVB, TPU, ionomer, OCA material layers.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides an asymmetric structure liquid crystal dimming glass, wherein film layers and base plates on two sides of a dimming film layer in the dimming glass have obvious difference in thickness, stress fields of the dimming film layer in the asymmetric structure liquid crystal dimming glass after a high-temperature high-pressure film laminating process can be in asymmetric distribution, stress is released after the dimming film layer returns to room temperature, residual stress is reduced, the residual stress of the dimming film layer is obviously lower than that of the conventional liquid crystal dimming glass in a symmetric structure, liquid crystal aggregation in the dimming film layer is avoided, and the problem of uneven color after lamination is effectively solved.
Drawings
Fig. 1 is a schematic structural view of a conventional light-adjusting glass;
FIG. 2 is a schematic diagram showing the color unevenness of a conventional light-adjusting glass in a dark state;
fig. 3 is a schematic structural diagram of an asymmetric liquid crystal dimming glass of embodiment 1;
FIG. 4 is a schematic view of the liquid crystal dimming glass with asymmetric structure of embodiment 1 with uniform color in dark state;
fig. 5 is a schematic structural diagram of an asymmetric lcd dimming glass of embodiment 2;
fig. 6 is a schematic structural diagram of an asymmetric lcd dimming glass of embodiment 3;
fig. 7 is a schematic structural diagram of an asymmetric liquid crystal dimming glass of embodiment 4.
Reference numerals illustrate:
10: a first transparent substrate; 11: a first film layer; 12: a dimming film layer; 13: a second film layer; 14: a second transparent substrate; 15: a third film layer; 1001: a glass substrate of conventional light-adjusting glass; 1000: a dimming film of conventional dimming glass; 1002: glue layer of traditional light-adjusting glass.
Detailed Description
The following description of the embodiments of the present invention will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a conventional light-adjusting glass, in which the glue layers 1002 and the glass substrates 1001 on both sides of the light-adjusting film 1000 are made of the same material and are fabricated by lamination, and can be regarded as a symmetrical structure using the light-adjusting film as a symmetry plane. Fig. 2 is a view showing a case where color unevenness occurs in the conventional light control glass during lamination. Such conventional light-adjusting glass is subjected to a high-pressure, high-temperature lamination environment in which the adhesive layer melts and flows, thereby causing movement of the liquid crystal in the light-adjusting film 1000. When the glue layer is cooled and solidified, obvious residual stress can be formed due to the obvious difference of thermal expansion coefficients among the dimming film, the glue layer and the glass matrix. Such stress makes the flowing liquid crystal not completely return to its original position, causing the liquid crystal to aggregate in some areas of uneven stress, thereby causing color unevenness of the dimming film. As shown in fig. 2, the light-adjusting glass adopting the symmetrical structure design generates the phenomenon of color aggregation or uneven color, and the light-adjusting glass can form a relatively symmetrical stress field during lamination, so that residual stress is difficult to release effectively. The dimming glass product shown in fig. 2 adopts a glass substrate with the thickness of 2.1mm, and the glass is unfavorable for releasing residual stress due to high rigidity, and the phenomenon of uneven color is easy to generate.
Referring to fig. 3, an asymmetric structure liquid crystal dimming glass is provided in the present embodiment, and the asymmetric structure liquid crystal dimming glass includes a first transparent substrate 10, a first film layer 11, a dimming film layer 12, a second film layer 13, and a second transparent substrate 14 laminated and fixed. The second film layer 13 is formed by overlapping a plurality of third film layers 15 with the same layer thickness. The first film layer 11 may be formed by stacking a plurality of third film layers 15 with the same layer thickness, but the number of stacked second film layers 13 may be greater than the number of stacked first film layers 11, and the thicknesses of the first film layer 11 and the second film layer 13 may be adjusted by controlling the number of third film layers 15.
In this embodiment, the first transparent substrate 10 is made of 0.7mm toughened glass, the second transparent substrate 14 is made of 2.1mm toughened glass, and the third film is made of EVA film with a thickness of 0.76 mm. The dimming film layer 12 is a dimming film which is made of a flexible substrate and is manufactured by adopting a liquid crystal technology, one layer of the third film layer 15 is used for the first film layer 11, and three layers of the third film layer 15 are used for the second film layer 13. The light-adjusting glass formed by the structure with the thickness ensures that the layered structure at two sides of the light-adjusting film layer 12 is asymmetric, particularly the first transparent substrate 10 and the second transparent substrate 14, and ensures that the thickness of the first transparent substrate 10 and the second transparent substrate is different and has obvious thickness difference.
In this embodiment, the manufacturing steps of the liquid crystal dimming glass with an asymmetric structure are as follows:
step 1: first, the first transparent substrate 10 and the second transparent substrate 14 are cleaned, so that the surfaces of the first transparent substrate 10 and the second transparent substrate 14 are completely free from dust, oil marks or any other impurities.
Step 2: the third film layer 15, i.e. the EVA film with thickness of 0.76mm, is cut according to the size requirements of the first transparent substrate 10 and the second transparent substrate 14, and it is ensured that the EVA film is flat and free of any flaws.
Step 3: the first and second transparent substrates 10 and 14, EVA film, and dimming film layer 12 are placed in a vacuum bag dedicated to laminated glass according to a specified machine configuration. Vacuum was applied at a pressure of-0.1 Mpa and this state was maintained for 30 minutes to ensure that bubbles in the film layer were eliminated.
Step 4: after evacuation for 30 minutes, the sample in the vacuum bag was moved to the oven while maintaining the vacuum. First, the temperature was raised to 70 ℃ and maintained for 20 minutes; then, the temperature was further raised to 115℃and continued for 30 minutes.
Step 5: when the heating process is completed, the oven is closed and the sample is allowed to cool naturally. When the temperature of the sample was reduced to 40 ℃, it could be removed from the oven.
Step 6: finally, a strict visual inspection of the finished product is performed, ensuring that it is completely free of bubbles, cracks or other flaws. Then, the excess EVA film and the edge portion of the glass are cut off.
After the above steps, a finished product is made, and as shown in fig. 4, the finished product is a display state of the dimming glass in a dark state, and the color displayed by the dimming glass in the dark state is uniform.
Example 2
Referring to fig. 5, an asymmetric structure liquid crystal dimming glass is provided in this embodiment, where the asymmetric structure liquid crystal dimming glass includes a first transparent substrate 10, a first film layer 11, a dimming film layer 12, a second film layer 13, and a second transparent substrate 14, which are laminated and fixed, and the first film layer 11 and the second film layer 13 are composed of a third film layer 15. The first transparent substrate 10 adopts toughened glass with the thickness of 1.1mm, the second transparent substrate 14 adopts toughened glass with the thickness of 1.85mm, and the third film adopts PVB film with the thickness of 0.76 mm. The light adjusting film layer 12 is a light adjusting film made of flexible substrate and liquid crystal technology, and the first film layer 11 and the second film layer 13 are two layers of the third film layer 15. The thickness of the first film layer 11 is the same as that of the second film layer 13, and the thickness of the second transparent substrate 14 is larger than that of the first transparent substrate 10, so that the layered structure at two sides of the light-adjusting film layer 12 is ensured to be asymmetric.
In this embodiment, since the material used for the film layer is PVB, the lamination process of the light control glass is slightly different from that of embodiment 1, and the lamination process of the light control glass of this embodiment is as follows:
step 1: first, the first transparent substrate 10 and the second transparent substrate 14 are cleaned, so that the surfaces of the first transparent substrate 10 and the second transparent substrate 14 are ensured to be free from dust, oil marks or other impurities. The third film layer 15, i.e. the PVB film, is then cut according to the size requirements of the first transparent substrate 10 and the second transparent substrate 14, and ensures that the PVB film is flat and free of any imperfections.
Step 2: between the two cleaned first transparent substrates 10 and the second transparent substrates 14, a PVB film and a dimming film layer 12 are precisely placed, ensuring that there are no air bubbles between them and the first transparent substrates 10 and the second transparent substrates 14. Thereafter, the assembled glass was put into a preliminary press and operated at 110 ℃ and 0.1MPa pressure, so that PVB film could be preliminarily bonded to the first transparent substrate 10 and the second transparent substrate 14.
Step 3: the preliminarily bonded glass is placed in a high temperature autoclave at 130 ℃ and 1MPa pressure to ensure complete adhesion of the PVB film, the light-adjusting film layer 12, and the first transparent substrate 10 and the second transparent substrate 14.
Step 4: after the high temperature and high pressure treatment is completed, the light-adjusting glass needs to be cooled to ensure the stability of the laminated glass.
Step 5: a strict visual inspection of the finished dimmed glass is performed to ensure that it is free of bubbles, cracks or other flaws. Finally, the excess PVB film and the edge portions of the glass are trimmed away.
Example 3
Referring to fig. 6, an asymmetric structure liquid crystal dimming glass is provided in this embodiment, where the asymmetric structure liquid crystal dimming glass includes a first transparent substrate 10, a first film layer 11, a dimming film layer 12, a second film layer 13, and a second transparent substrate 14, which are laminated and fixed, and the first film layer 11 and the second film layer 13 are composed of a third film layer 15. The first transparent substrate 10 adopts a PC layer with the thickness of 0.5mm, and the surface layer of the first transparent substrate 10 is subjected to hardening and waterproof treatment. The second transparent substrate 14 is made of 2.1mm toughened glass, and the third film is made of 0.76mm TPU film. The light adjusting film layer 12 is a light adjusting film made of flexible substrate and liquid crystal technology, and the first film layer 11 and the second film layer 13 are both made of one third film layer 15. The thickness of the first film layer 11 is the same as that of the second film layer 13, and the thickness of the second transparent substrate 14 is larger than that of the first transparent substrate 10, so that the layered structure at two sides of the light-adjusting film layer 12 is ensured to be asymmetric. The lamination process of the light control glass in this embodiment is the same as that in embodiment 2. In this embodiment, by adopting an asymmetric design and thinning the glass on one side of the light modulation film layer 12 or replacing it with a light material such as PC, the weight of the overall structure is significantly reduced. For automotive applications, such a lightweight design may improve the fuel efficiency of a fuel vehicle or extend the range of an electric vehicle battery.
Example 4
Referring to fig. 7, an asymmetric structure liquid crystal dimming glass is provided in this embodiment, where the asymmetric structure liquid crystal dimming glass includes a first transparent substrate 10, a first film layer 11, a dimming film layer 12, a second film layer 13, and a second transparent substrate 14, which are laminated and fixed, and the first film layer 11 and the second film layer 13 are composed of a third film layer 15. The first transparent substrate 10 adopts a PC layer with the thickness of 1mm, the second transparent substrate 14 adopts a PC layer with the thickness of 3mm, the surface layers of the first transparent substrate 10 and the second transparent substrate 14 are subjected to hardening and waterproof treatment, and the third film adopts a TPU film with the thickness of 0.60 mm. The dimming film layer 12 is a dimming film based on a flexible substrate and manufactured by adopting a liquid crystal technology, the first film layer 11 uses one layer of the third film layer 15, the second film layer 13 uses two layers of the third film layer 15, and the dimming glass formed by the structure with the thickness ensures that the hierarchical structures at two sides of the dimming film layer 12 are asymmetric. The lamination process of the light control glass in this embodiment is the same as that in embodiment 2.
It should be noted that, the technical solutions of the embodiments of the present invention may be combined with each other, but it must be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the technical solutions are not combined, and are not within the scope of the claimed invention.
The above description of the preferred embodiments of the present invention should not be taken as limiting the scope of the invention, but rather should be understood to cover all modifications, variations and adaptations of the present invention using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present invention to other relevant arts and technologies.
Claims (8)
1. The liquid crystal dimming glass with the asymmetric structure is characterized by comprising a first transparent substrate, a first film layer, a dimming film layer, a second film layer and a second transparent substrate which are laminated and fixed, wherein the thickness of the first transparent substrate is less than or equal to 60% of the thickness of the second transparent substrate, and the thickness range of the first transparent substrate is 0.15-1.3 mm.
2. The asymmetrically structured liquid crystal dimming glass according to claim 1, wherein the thickness of the second film layer is greater than or equal to the thickness of the first film layer.
3. The asymmetric structured liquid crystal dimming glass as claimed in claim 1, wherein the thickness of the first film layer ranges from 0.15mm to 1.6mm, and the thickness of the second film layer ranges from 0.3mm to 2.5mm.
4. The asymmetric structure liquid crystal dimming glass as claimed in claim 1, wherein the thickness of the second transparent substrate ranges from 1.5mm to 3mm.
5. The asymmetric structured liquid crystal dimming glass according to claim 1, wherein the second film layer is formed by superposing a plurality of third film layers with the same layer thickness.
6. The asymmetric structured liquid crystal dimming glass of claim 1, wherein the first film layer and the second film layer are interchangeable in position.
7. The asymmetric structured liquid crystal dimming glass of claim 1, wherein the first transparent substrate and the second transparent substrate are glass layers or flexible transparent optical material transparent layers.
8. The asymmetric structured liquid crystal dimming glass of claim 1, wherein the first film layer and the second film layer are one or more of EVA, PVB, TPU, ionomer, OCA material layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311054015.1A CN117233996A (en) | 2023-08-21 | 2023-08-21 | Liquid crystal dimming glass with asymmetric structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311054015.1A CN117233996A (en) | 2023-08-21 | 2023-08-21 | Liquid crystal dimming glass with asymmetric structure |
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| Publication Number | Publication Date |
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| CN117233996A true CN117233996A (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311054015.1A Pending CN117233996A (en) | 2023-08-21 | 2023-08-21 | Liquid crystal dimming glass with asymmetric structure |
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| Country | Link |
|---|---|
| CN (1) | CN117233996A (en) |
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2023
- 2023-08-21 CN CN202311054015.1A patent/CN117233996A/en active Pending
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