Laminated glass capable of preventing bird impact

Abstract

The invention belongs to the field of glass, and particularly relates to laminated glass capable of preventing bird impact. The invention mainly provides glass which is friendly to birds and can be recognized by the birds without hindering the sight of human beings. And the birds are prevented from being injured or dead due to collision with the glass because the birds cannot distinguish the high-transparency glass during flying. The laminated glass capable of preventing bird impact is mainly applied to building glass curtain walls, windows, fences, front windshields and glass side windows of vehicles and the like. The visible light permeability does not need to be lost, the liquid crystal reflecting layer can be a glass interlayer, or liquid crystal is used as an interlayer, and glass is laminated outside. All the elements are compatible with current glass systems. The film layer can also be manufactured by using an R2R (roll to roll) continuous roller printing manufacturing technology. The cost is saved, and the method is suitable for large-size production. The liquid crystal display can be driven by combining with the current liquid crystal technology, such as cholesteric liquid crystal or dye liquid crystal. And other display effects are achieved.

Description

Technical Field

[0001] The present invention belongs to the field of glass, and particularly relates to a laminated glass for preventing bird strikes. Background Art

[0002] According to the Sibley guides survey and statistics, window collisions are the number one cause of unnatural bird deaths. In the United States, it is estimated that about 1 billion wild birds die each year due to window collisions, and about 8 million in South Korea. First, birds cannot recognize glass as a separator or obstacle; second, birds are prone to misjudging the mirror effect, making it impossible for them to distinguish between the glass reflection image of a high-rise building and the actual situation and thus collide. The glass structure proposed by the present invention creates a safe environment for birds, provides visual cues for birds, and avoids injury or death from collisions.

[0003] Existing bird-friendly glass technologies mainly involve externally attaching an ultraviolet (UV) reflective coating that reflects ultraviolet radiation outside the window, or using decals or visual recognition principles to make it easier for birds to see the window, thereby reducing bird collisions and bird deaths.

[0004] CN107429538A discloses an insulating glass unit for preventing bird collisions, including a glass-embedded reflective sheet; or using laser glass to draw patterns.

[0005] Depending on the conditions for generating liquid crystals, they are divided into thermotropic liquid crystals (thermotropic LC) and lyotropic liquid crystals (lyotropic LC), which are formed by heating and adding solvents to form two cases of liquid crystal thermal phases and lyotropic phases, respectively. Liquid crystals whose optoelectronic effects are controlled by temperature conditions are called thermotropic liquid crystals; lyotropic liquid crystals are controlled by concentration conditions. Liquid crystals for display are generally low-molecular thermotropic liquid crystals.

[0006] Thermotropic liquid crystals include nematic phase, smectic phase, and cholesteric phase. Summary of the Invention

[0007] If the sputtering metal reflection method is used, the sputtering cost is high. If stickers are used, although the cost is low, first, they will be damaged over time, and second, they need to be installed on the system later, and the defensive effect cannot be achieved immediately after installation.

[0008] Other methods must sacrifice the visual experience of the occupants or the overall effect of the residence, and cannot achieve a 100% high-definition and completely clear visual effect of the glass.

[0009] To solve the above-mentioned existing technical problems, the present application provides the following technical solutions:

[0010] This invention is a glass system, laminated or containing a liquid crystal layer or liquid crystal film, whose liquid crystal film layer formulation has the property of reflecting the UV band, so as to alert birds and avoid collision injuries and deaths.

[0011] The present invention provides a laminated glass for preventing bird strikes, comprising a substrate and a superimposed layer; the superimposed layer is a plurality of ultraviolet light reflecting layers and substrates alternately arranged; the raw materials of the ultraviolet light reflecting layer include a liquid crystal medium; the reflection wavelength of the ultraviolet light reflecting layer is 100-420nm.

[0012] Preferably, in the ultraviolet light reflecting layer, the liquid crystal is filled in a whole surface or in a patterned manner.

[0013] Preferably, the liquid crystal medium is selected from cholesteric liquid crystal, smectic liquid crystal or nematic liquid crystal. By different liquid crystal formulations, different display effects can be achieved.

[0014] Further, the cholesteric liquid crystal includes a cholesteric liquid crystal polymer network or cholesteric liquid crystal polymer droplets.

[0015] Preferably, the cholesteric liquid crystal is further added with a nematic liquid crystal and a chiral agent, and the number of helical layers is 0.5-200 layers.

[0016] Preferably, the raw materials of the ultraviolet light reflecting layer further include one or more of an antioxidant, a heat-resistant additive and a photosensitizer.

[0017] Further, the antioxidant is selected from styrene antioxidants.

[0018] Further, the photosensitizer is selected from phenylalkyl diazophenols, aminophenyl ketones or epoxy compounds.

[0019] Further, the heat-resistant additive is selected from hot-melt adhesives.

[0020] Preferably, the raw materials of the ultraviolet light reflecting layer further include a polymerizable monomer and a photoinitiator; the polymerizable monomer is selected from a liquid crystalline polymerizable monomer or a non-liquid crystalline polymerizable monomer. Under the irradiation of ultraviolet light, visible light or infrared light, the photoinitiator generates free radicals to cause a reaction to occur, and forms a surface polymer or a spatial network polymer.

[0021] Further, the liquid crystalline polymerizable monomer is selected from p-hydroxybenzoic acid, hydroquinone, terephthalic acid and isophthalic acid.

[0022] Further, the liquid crystalline polymerizable monomer is selected from terephthalic acid, phenylhydroquinone and styrylhydroquinone.

[0023] The liquid-crystalline polymerizable monomer has liquid crystallinity and can self-organize at the molecular level to form a liquid crystal phase. For example, tens of thousands of liquid crystal monomers have been synthesized, and there are mainly nearly 20 practical varieties. The molecules of these liquid crystal monomers are mostly rod-shaped structures with an aspect ratio of 4:1, and the molecular ends contain polar or polarizable groups to keep the molecules in an oriented order.

[0024] Furthermore, the non-liquid-crystalline polymerizable monomer is a monomer without liquid crystallinity, and the non-liquid-crystalline polymerizable monomer is selected from acrylate monomers, ethylene monomers or silicone rubber monomers.

[0025] Preferably, the raw material of the ultraviolet light reflection layer further includes a dichroic dye; the concentration of the dichroic dye is greater than 10 ppm and less than 50 wt%. The dye liquid crystal includes the above-mentioned cholesteric liquid crystal system and liquid crystal system. The light and dark degree and UV reflection effect are regulated by the rotation of the liquid crystal.

[0026] A dichroic dye is a dye with different extinction coefficients for parallel polarized light and perpendicular polarized light. Dichroic dyes include anthraquinone dyes, azo dyes or phthalocyanine dyes.

[0027] Preferably, a liquid crystal alignment layer is provided between the substrate and the ultraviolet light reflection layer.

[0028] Preferably, the substrate is a transparent glass or a flexible substrate.

[0029] Specifically, the flexible substrate is a flexible copper clad laminate with a polyimide (PI) insulating layer.

[0030] Preferably, the liquid crystal molecules in the ultraviolet light reflection layer can be converted after being externally powered, that is, the ultraviolet light reflection layer is designed as an element in which the liquid crystal molecules can be converted. For its power supply and power supply system, in addition to direct power supply, it can also be combined with green energy resources, such as photovoltaic, for alternating power supply, or set to select one power supply.

[0031] This liquid crystal film layer can be compatible with existing windows or glass curtain wall structures.

[0032] The principle and visual effect of fabricating a film layer element for reflecting ultraviolet rays by liquid crystal technology are as Figure 1 shown. Figure 1 (a) is the human visual effect, Figure 1 (b) and (c) are both the avian visual effects, Figure 1 (b) is the effect of coating the entire surface of the substrate with a layer that reflects the ultraviolet wavelength range. Figure 1 (c) is the effect of patterning the UV reflection layer on part of the substrate to create a warning effect.

[0033] The main content of the present invention is to invent a bird-friendly glass that can be recognized by birds without obstructing the human line of sight. This helps prevent birds from being injured or killed by crashing into highly transparent glass during flight. It is mainly applied to building glass curtain walls, windows, fences, the front windshield and side glass windows of vehicles, etc.

[0034] 1. The present invention uses a liquid crystal formulation to prepare a film layer that can reflect ultraviolet light, which is then laminated with glass.

[0035] 2. In the present invention, the film layer can be manufactured using the R2R (roll to roll) continuous roller printing manufacturing technology, which saves costs and is suitable for large-scale production.

[0036] 3. In the present invention, only the UV band is reflected, without affecting the permeability of visible light.

[0037] 4. The products of the present invention are suitable for large sizes.

[0038] The technical solution of the present invention has the following advantages compared with the prior art:

[0039] Compared with the current bird impact prevention glass technology, such laminated glass using liquid crystal to reflect ultraviolet light can achieve

[0040] 1. Without sacrificing the permeability of visible light (the visual effect is clear and transparent).

[0041] 2. The liquid crystal reflective layer can be a glass interlayer, or a liquid crystal can be used as the interlayer and laminated with glass on the outside. The components can all be compatible with the current glass system.

[0042] 3. The film layer can also be manufactured using the R2R (roll to roll) continuous roller printing manufacturing technology, which saves costs and is suitable for large-scale production.

[0043] 4. It can combine with current liquid crystal technologies, such as cholesteric liquid crystal or dye liquid crystal, through driving, and has other display effects. Description of the Drawings

[0044] Figure 1 It is a schematic diagram of laminated glass for preventing bird impact. Detailed Embodiments

[0045] The following further illustrates the present invention in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the examples given are not intended to limit the present invention.

[0046] Example 1

[0047] A laminated glass for preventing bird strikes, comprising a transparent glass, an ultraviolet light reflection layer, and a transparent glass arranged in sequence; the reflection wavelength of the ultraviolet light reflection layer is 100 nm.

[0048] The raw materials of the ultraviolet light reflection layer include a liquid crystal medium, and the filling of the liquid crystal medium in the ultraviolet light reflection layer is a whole surface. The liquid crystal medium is selected from cholesteric liquid crystals and is a cholesteric liquid crystal polymer network.

[0049] The ultraviolet light reflection layer also contains nematic liquid crystals and chiral agents, and the number of helical layers is 100. The raw materials of the ultraviolet light reflection layer also include a dichroic dye, and the concentration of the dichroic dye is 40 wt%.

[0050] Example 2

[0051] A laminated glass for preventing bird strikes, comprising a flexible substrate, a first liquid crystal alignment layer, a first ultraviolet light reflection layer, a second liquid crystal alignment layer, a flexible substrate, a third liquid crystal alignment layer, a second ultraviolet light reflection layer, a fourth liquid crystal alignment layer, and a flexible substrate; the raw materials of the ultraviolet light reflection layer include a liquid crystal medium; the reflection wavelength of the ultraviolet light reflection layer is 420 nm. The filling of the liquid crystal medium is patterned.

[0052] The liquid crystal medium is selected from cholesteric liquid crystals and is cholesteric liquid crystal polymer droplets. The raw materials of the ultraviolet light reflection layer also include non-liquid crystalline polymerizable monomers and photoinitiators.

[0053] Example 3

[0054] A laminated glass for preventing bird strikes, comprising a transparent glass, a transparent glass, and a transparent glass; the raw materials of the ultraviolet light reflection layer include a liquid crystal medium; the reflection wavelength of the ultraviolet light reflection layer is 320 nm.

[0055] The filling of the liquid crystal is a whole surface.

[0056] The liquid crystal medium is selected from smectic liquid crystals, and the raw materials also include antioxidants, heat-resistant additives, and photosensitizers.

[0057] The raw materials of the ultraviolet light reflection layer also include liquid crystalline polymerizable monomers and photoinitiators.

[0058] Example 4

[0059] A laminated glass for preventing bird strikes, comprising a flexible substrate, an ultraviolet light reflection layer, and a flexible substrate; the raw materials of the ultraviolet light reflection layer include a liquid crystal medium; the reflection wavelength of the ultraviolet light reflection layer is 100 - 420 nm.

[0060] The filling of the liquid crystal is a whole surface or patterned.

[0061] The liquid crystal medium is selected from nematic liquid crystals.

[0062] Example 5

[0063] A laminated glass for preventing bird strikes, comprising a transparent glass, an ultraviolet light reflecting layer, and a transparent glass arranged in sequence; the reflection wavelength of the ultraviolet light reflecting layer is 100 nm.

[0064] The raw materials of the ultraviolet light reflecting layer include a liquid crystal medium, and the filling of the liquid crystal medium in the ultraviolet light reflecting layer is a whole surface. The liquid crystal medium is selected from cholesteric liquid crystals and is a cholesteric liquid crystal polymer network.

[0065] The ultraviolet light reflecting layer is also added with nematic liquid crystals and chiral agents, and the number of helical layers is 200 layers. The raw materials of the ultraviolet light reflecting layer also include dichroic dyes, and the concentration of the dichroic dyes is 40 wt%.

[0066] Example 6

[0067] A laminated glass for preventing bird strikes, comprising a transparent glass, an ultraviolet light reflecting layer, and a transparent glass arranged in sequence; the reflection wavelength of the ultraviolet light reflecting layer is 100 nm.

[0068] The raw materials of the ultraviolet light reflecting layer include a liquid crystal medium, and the filling of the liquid crystal medium in the ultraviolet light reflecting layer is a whole surface. The liquid crystal medium is selected from cholesteric liquid crystals and is a cholesteric liquid crystal polymer network.

[0069] The ultraviolet light reflecting layer is also added with nematic liquid crystals and chiral agents, and the number of helical layers is 0.5 layer. The raw materials of the ultraviolet light reflecting layer also include dichroic dyes, and the concentration of the dichroic dyes is 40 wt%.

[0070] Example 7

[0071] A laminated glass for preventing bird strikes, comprising a transparent glass, an ultraviolet light reflecting layer, and a transparent glass arranged in sequence; the reflection wavelength of the ultraviolet light reflecting layer is 320 nm.

[0072] The raw materials of the ultraviolet light reflecting layer include a liquid crystal medium, and the filling of the liquid crystal medium in the ultraviolet light reflecting layer is a whole surface. The liquid crystal medium is selected from cholesteric liquid crystals and is a cholesteric liquid crystal polymer network.

[0073] The ultraviolet light reflecting layer is also added with nematic liquid crystals and chiral agents, and the number of helical layers is 200 layers. The raw materials of the ultraviolet light reflecting layer also include dichroic dyes, and the concentration of the dichroic dyes is 40 wt%.

[0074] Example 7

[0075] A laminated glass for preventing bird strikes, comprising a transparent glass, an ultraviolet light reflecting layer, and a transparent glass arranged in sequence; the reflection wavelength of the ultraviolet light reflecting layer is 360 nm.

[0076] The raw materials of the ultraviolet light reflection layer include a liquid crystal medium, and the filling of the liquid crystal medium in the ultraviolet light reflection layer is a whole surface. The liquid crystal medium is selected from cholesteric liquid crystals and is a cholesteric liquid crystal polymer network.

[0077] A nematic liquid crystal and a chiral agent are also added to the ultraviolet light reflection layer, and the number of helical layers is 200. The raw materials of the ultraviolet light reflection layer also include a dichroic dye, and the concentration of the dichroic dye is 40 wt%.

[0078] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A laminated glass for preventing bird strikes, characterized in that, It includes a substrate and a stacked layer; the stacked layer is a plurality of ultraviolet light reflection layers and substrates arranged alternately; the raw material of the ultraviolet light reflection layer includes a liquid crystal medium; the reflection wavelength of the ultraviolet light reflection layer is 100 - 420 nm; the liquid crystal medium is selected from cholesteric liquid crystal, smectic liquid crystal or nematic liquid crystal.

2. The laminated glass for preventing bird strikes according to claim 1, characterized in that, The cholesteric liquid crystal includes a cholesteric liquid crystal polymer network or cholesteric liquid crystal polymer droplets.

3. The laminated glass for preventing bird strikes according to claim 1, characterized in that, The cholesteric liquid crystal is also added with nematic liquid crystal and a chiral agent, and the number of helical layers is 0.5 - 200 layers.

4. The laminated glass for preventing bird strikes according to claim 1, wherein The raw material of the ultraviolet light reflection layer also includes one or more of an antioxidant, a heat-resistant additive and a photosensitizer.

5. The laminated glass for preventing bird strikes according to claim 1, wherein The raw material of the ultraviolet light reflection layer also includes a polymerizable monomer and a photoinitiator.

6. The laminated glass for preventing bird strikes according to claim 5, wherein, The polymerizable monomer is selected from a liquid crystal polymerizable monomer or a non-liquid crystal polymerizable monomer.

7. The laminated glass for preventing bird strikes according to claim 1, characterized in that, The raw material of the ultraviolet light reflection layer also includes a dichroic dye; the concentration of the dichroic dye is greater than 10 ppm and less than 50 wt%.

8. The laminated glass for preventing bird strikes according to claim 1, characterized in that, A liquid crystal alignment layer is provided between the substrate and the ultraviolet light reflection layer.

9. The laminated glass for preventing bird strikes according to claim 1, wherein, The substrate is a transparent glass or a flexible substrate.

10. The laminated glass for preventing bird strikes according to claim 1, characterized in that, The liquid crystal molecules in the ultraviolet light reflection layer can be converted after being externally powered.

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