Preparation method of colored light-adjusting glass

Abstract

The invention relates to the technical field of colored light-adjusting glass, and provides colored light-adjusting glass which comprises a first glass plate, a second glass plate, a PDLC film, a first bonding layer and a second bonding layer, and the first bonding layer and the second bonding layer are arranged on the two sides of the PDLC film. Common glass, tempered glass or double-layer glass is adopted as a first glass plate and a second glass plate of the colored dimming glass; the PDLC film is arranged between the two glass plates, has the temperature resistance of more than 120 DEG C, and can adapt to a high-pressure autoclave laminating process; the first bonding layer and the second bonding layer are made of colored transparent films and contain more than 2% of ultraviolet light absorber, so that the absorption rate of ultraviolet light is more than 90%. The preparation method disclosed by the invention comprises the following steps: sequentially stacking all layers of materials, feeding the stacked materials into a high-pressure kettle, and carrying out laminated lamination, wherein the highest temperature can reach 120 DEG C. The problem of performance degradation caused by ultraviolet rays when PDLC is used outdoors is solved, meanwhile, the appearance effect of the dimming glass is enriched, and the application range of the dimming glass in the building field is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of colored dimming glass, and more specifically, to a preparation method of colored dimming glass. Background Art

[0002] Polymer Dispersed Liquid Crystal (PDLC) is a new type of functional material, which is a polymer-liquid crystal composite material formed by uniformly dispersing micron-sized or nano-sized liquid crystal molecules in a polymer matrix and combining with it. As an intelligent dimming material, the PDLC film controls the arrangement pattern of liquid crystal molecules by changing the applied external electric field, thereby adjusting the light transmittance and realizing the controllable switching between the transparent and opaque states.

[0003] In the absence of an electric field, the liquid crystal molecules inside the PDLC are randomly arranged. When the incident light passes through the interface between the liquid crystal and the polymer, scattering occurs, making the film present an opaque milky white state. When an electric field is applied, the liquid crystal molecules are rearranged along the direction of the electric field, and their refractive index is close to matching that of the polymer matrix, so that the light can directly pass through without scattering, and the film turns into a transparent state. Due to the many advantages of PDLC, such as fast response speed (usually in milliseconds), wide viewing range (almost 180°), no polarization dependence, and moderate operating voltage (about 25 - 100V), it has been widely used in fields such as intelligent dimming glass for commercial buildings, conference room partitions, display windows, large-area flexible displays, and some wearable devices.

[0004] However, when PDLC products are used outdoors, they will continuously absorb ultraviolet energy when exposed to sunlight for a long time. This energy will trigger the free radical chain reaction and auto-oxidation process of polymer materials, resulting in the breakage of polymer molecular chains and the destruction of cross-linked structures, and ultimately significantly reducing the optical properties, electro-optical response properties, and mechanical stability of the PDLC film. In addition, most of the existing PDLC dimming products on the market present a single white or milky white tone. While meeting the basic functional requirements, this severely limits their application scenarios in the field of modern architectural glass. Current architectural design pays more and more attention to appearance personalization and aesthetic effects, and single-color dimming glass cannot meet the creative needs of different architectural styles and designers. Summary of the Invention

[0005] To overcome the above-mentioned defects of the prior art, the present invention provides a colored dimming glass, which includes a first glass plate, a second glass plate, a PDLC film, and a first adhesive layer and a second adhesive layer located on both sides of the PDLC film. The present invention uses a colored transparent film containing an ultraviolet absorber with a proportion greater than 2% and an ultraviolet absorption rate greater than 90% as the adhesive layer, solving the problem of performance attenuation caused by ultraviolet rays when existing PDLC products are used outdoors. At the same time, through the colored adhesive layer, the limitation of the single appearance of traditional PDLC products is broken, and the application range of dimming glass in the construction field is broadened.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A colored dimming glass, comprising: a first glass plate (11), a second glass plate (12); a PDLC film (3) disposed between the first glass plate (11) and the second glass plate (12); a first adhesive layer (21) located between the first glass plate (11) and the PDLC film (3), and a second adhesive layer (22) located between the second glass plate (12) and the PDLC film (3); wherein, both the first adhesive layer (21) and the second adhesive layer (22) are colored transparent films, and the proportion of the ultraviolet absorber in the first adhesive layer (21) and the second adhesive layer (22) is greater than 2%, and the absorption rate of ultraviolet light is greater than 90%.

[0008] Specifically, the first glass plate (11) and the second glass plate (12) can be made of various materials, such as quartz glass, silicate glass or soda-lime glass, etc. These glass plates can be ordinary glass, tempered glass or double-layer glass. To meet the requirements of different application scenarios, the thickness of the glass plate in the present invention can be selected within the range of 0.4 mm to 20 mm, providing a wide range of structural adaptability.

[0009] The key technical feature of the present invention lies in the design of the first adhesive layer and the second adhesive layer. These two adhesive layers are both made of colored transparent films such as EVA, PVB or SGP, and their thickness is 0.38 mm to 2.28 mm. Different from traditional dimming glass, the present invention adds a specific proportion of ultraviolet absorber to the adhesive layer, so that the proportion of the ultraviolet absorber component is greater than 2%, thereby ensuring that the absorption rate of ultraviolet light is higher than 90%. This specially designed adhesive layer can not only connect and fix each structural layer, but also effectively block the damage of ultraviolet radiation to the PDLC film.

[0010] The ultraviolet absorbers in the first adhesive layer (21) and the second adhesive layer (22) play a crucial role. When external ultraviolet light irradiates the colored dimming glass of the present invention, the first adhesive layer (21) can absorb and block most of the ultraviolet light, significantly reducing the intensity of the ultraviolet light reaching the PDLC film; at the same time, the second adhesive layer (22) provides double protection to ensure that even if a small amount of ultraviolet light penetrates the PDLC film, it can be effectively absorbed, thereby comprehensively protecting the PDLC film from damage by ultraviolet radiation.

[0011] As a further solution of the present invention, to ensure that the PDLC film (3) will not be damaged due to high temperature during the production process, the heat resistance of the PDLC film (3) is greater than 120 °C.

[0012] As a further solution of the present invention, it includes the following steps: stacking the first glass plate (11), the first adhesive layer (21), the PDLC film (3), the second adhesive layer (22) and the second glass plate (12) in sequence; feeding the stacked structure into an autoclave for laminating, wherein the temperature in the autoclave can reach up to 120 °C.

[0013] Compared with the prior art, the beneficial effects of a colored dimming glass of the present invention are as follows: by adding an ultraviolet absorber with a proportion greater than 2% in the first adhesive layer and the second adhesive layer, the present invention achieves an ultraviolet light absorption rate of more than 90%, forming a double protection barrier for the PDLC film. When the PDLC dimming glass products in the prior art are used outdoors, due to the lack of effective ultraviolet protection measures, the liquid crystal molecules and polymer matrix are continuously exposed to ultraviolet radiation, which will cause free radical chain reactions and auto-oxidation processes in the polymer materials, resulting in the breakage of polymer molecular chains, and further significantly reducing the optical properties, electro-optical response properties and mechanical stability of the PDLC film, greatly shortening the service life of the product. The design of the present invention effectively solves this problem and significantly improves the durability and long-term performance stability of the PDLC dimming glass in outdoor environments.

[0014] Compared with the prior art, the beneficial effects of a colored dimming glass of the present invention are as follows: the present invention uses a colored transparent film as the adhesive layer material, which not only retains the dimming function of the PDLC film, but also endows the dimming glass with a rich color appearance. Most of the PDLC dimming products in the prior art present a single white or milky white state, which is difficult to meet the requirements of modern architectural design for personalization and aesthetic effects. The colored dimming glass of the present invention can select transparent films of various colors according to different architectural styles and design requirements, improving the decorative property while ensuring functionality, so that the dimming glass can be coordinated with various architectural styles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1Schematic diagram of the structure of a colored dimming glass according to the present invention. Detailed implementation mode

[0016] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment 1

[0018] A colored dimming glass, comprising: a first glass plate (11), a second glass plate (12); a PDLC film (3) disposed between the first glass plate (11) and the second glass plate (12); a first adhesive layer (21) located between the first glass plate (11) and the PDLC film (3), and a second adhesive layer (22) located between the second glass plate (12) and the PDLC film (3); wherein, both the first adhesive layer (21) and the second adhesive layer (22) are colored transparent films, and the proportion of the ultraviolet absorber component in the first adhesive layer (21) and the second adhesive layer (22) is greater than 2%, and the absorption rate of ultraviolet light is greater than 90%.

[0019] In the embodiment of the present invention, the thickness of the first glass plate (11) and the second glass plate (12) is 0.4 mm to 20 mm.

[0020] In the embodiment of the present invention, the first glass plate (11) and the second glass plate (12) are made of, including but not limited to, quartz glass, silicate glass, soda-lime glass, etc.

[0021] In the embodiment of the present invention, the first glass plate (11) and the second glass plate (12) are selected from ordinary glass, tempered glass or double-layer glass.

[0022] In the embodiment of the present invention, the thickness of the first adhesive layer (21) and the second adhesive layer (22) is 0.38 mm to 2.28 mm.

[0023] In the embodiment of the present invention, the first adhesive layer (21) and the second adhesive layer (22) are selected from colored transparent films such as EVA, PVB, SGP, etc.

[0024] In the embodiment of the present invention, the heat resistance of the PDLC film (3) is greater than 120 °C.

[0025] Embodiment 2

[0026] A colored dimming glass, comprising a first glass plate (11), a second glass plate (12), a PDLC film (3), a first adhesive layer (21) and a second adhesive layer (22). The first glass plate (11) and the second glass plate (12) are both tempered sodium-calcium glasses with a thickness of 5 mm, having good strength and safety performance. The first adhesive layer (21) and the second adhesive layer (22) both adopt PVB colored transparent films with a thickness of 0.76 mm, in which 3.5% of benzotriazole ultraviolet absorbers are added, and the ultraviolet light absorption rate in the wavelength range of 300 - 400 nm can reach 92%. The thickness of the PDLC film (3) is 0.38 mm, and the temperature resistance can reach 130 °C, meeting the temperature requirements of the subsequent autoclave process.

[0027] The preparation process in the embodiment of the present invention is as follows: First, the first glass plate (11) and the second glass plate (12) are cleaned to ensure that the surfaces are free of dust, oil stains and other impurities. The cleaned first glass plate (11) is placed flat on the workbench, and then the first adhesive layer (21), the PDLC film (3), the second adhesive layer (22) and the second glass plate (12) are laid in sequence to form a laminated structure. To avoid generating bubbles during the laying process, a soft rubber roller is used to gently press and exhaust air from the center to the periphery. After laying, the four peripheral edges of the laminated structure are fixed with special clamps to prevent displacement during the subsequent process. The fixed laminated structure is placed in a preheating chamber with a temperature controlled at 90 °C for preheating for 30 minutes to soften the PVB film and initially bond it with the glass and the PDLC film. After preheating, the laminated structure is placed in an autoclave for the formal laminating process. The temperature in the autoclave first rises to 115 °C and is maintained for 40 minutes, then rises to 120 °C and is maintained for 20 minutes. The pressure in the autoclave is maintained at 1.0 MPa throughout the process to ensure that the layers of materials are closely bonded together. After cooling to room temperature, the finished product is taken out and edge trimming is carried out to ensure that the edges are neat and beautiful.

[0028] Finally, the PDLC electrical performance test is carried out. The test contents include: measuring the light transmittance at 0 V and 100 V voltages, which are 18% and 85% respectively; response time test, the time from the opaque state to the transparent state is 8 ms, and the time from the transparent state to the opaque state is 15 ms; ultraviolet aging test, after continuously irradiating for 1000 hours in an ultraviolet aging chamber equivalent to 5 years of outdoor ultraviolet exposure, the photoelectric performance attenuation of the PDLC film does not exceed 5%, which is far better than the performance attenuation of more than 20% of ordinary PDLC products under the same conditions. The above test results show that the colored dimming glass of the present invention has excellent photoelectric performance and anti-ultraviolet aging performance.

[0029] Example 3

[0030] A colored dimming glass, comprising a first glass plate (11), a second glass plate (12), a PDLC film (3), a first adhesive layer (21) and a second adhesive layer (22). Among them, the first glass plate (11) is tempered silicate glass with a thickness of 8 mm, and the second glass plate (12) is a hollow double-layer tempered glass with a thickness of 8 mm (there is a 12-mm air layer between two 4-mm glasses). This structure not only has good mechanical strength, but also has excellent heat insulation and sound insulation properties, and is particularly suitable for building facades. Both the first adhesive layer (21) and the second adhesive layer (22) adopt blue SGP structural films with a thickness of 1.52 mm, which contain 2.8% of benzophenone ultraviolet absorbers and have a UV light absorption rate as high as 95%. The PDLC film (3) adopts a high-performance PDLC material with a heat-resistant performance of up to 135 °C and a thickness of 0.4 mm.

[0031] In the embodiment of the present invention, each layer of material is first pre-treated and laid in a clean room (cleanliness ≤ 1000 levels). Before laying, the SGP film needs to be preheated at 105 °C for 5 minutes to improve its flexibility. The laid laminated structure is first preheated at 80 °C for 20 minutes under normal pressure, and then evacuated to -0.09 MPa in a vacuum bag and maintained for 30 minutes to ensure sufficient exhaust. Then the vacuum bag is sealed and placed in an autoclave. Under a pressure of 1.2 MPa, starting from 90 °C, the temperature is raised to 120 °C at a rate of 2 °C / minute and maintained for 60 minutes, and then lowered to room temperature at a rate of 1 °C / minute.

[0032] The finished colored dimming glass presents a blue tone. In the non-electric field state, it has a semi-transparent blue frosted effect, and the light transmittance is about 20%; after applying a voltage of 100 V, it becomes transparent blue, and the light transmittance is increased to 88%. It not only maintains the dimming function of PDLC, but also adds an aesthetic decorative effect. This product is particularly suitable for the facades and interior partitions of high-end commercial buildings, adding a modern and artistic sense to the building. After 1500 hours of ultraviolet accelerated aging test (irradiation intensity 0.68 W / m2@340 nm), the attenuation rate of the optoelectronic performance of the product does not exceed 4%, and the mechanical performance remains stable, proving the remarkable effect of the present invention in improving the durability of PDLC products.

[0033] The applicability test shows that the colored dimming glass of this embodiment can maintain normal operation within the environmental temperature range of -30 °C to 70 °C, the response time is within 10 ms, and after being repeatedly switched on and off 100,000 times under a 100 V square wave signal, the dimming performance degradation does not exceed 3%, demonstrating excellent service life and reliability.

[0034] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.

[0035] Finally: The above description is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tinted glazing glass, characterized in that: include: A first glass plate (11) and a second glass plate (12); a PDLC film (3) disposed between the first glass plate (11) and the second glass plate (12); a first adhesive layer (21) located between the first glass plate (11) and the PDLC film (3), and a second adhesive layer (22) located between the second glass plate (12) and the PDLC film (3); wherein the first adhesive layer (21) and the second adhesive layer (22) are both colored transparent films, the proportion of ultraviolet absorbers in the first adhesive layer (21) and the second adhesive layer (22) is greater than 2%, and the absorption rate of ultraviolet light is greater than 90%.

2. The tinted light-emitting glass according to claim 1, characterized in that: The thickness of the first glass plate (11) and the second glass plate (12) is 0.4 mm to 20 mm.

3. The tinted light-emitting glass according to claim 1, characterized in that: The thickness of the first adhesive layer (21) and the second adhesive layer (22) is 0.38 mm to 2.28 mm.

4. The tinted light-emitting glass according to claim 1, characterized in that: The first adhesive layer (21) and the second adhesive layer (22) are selected from colored transparent films.

5. The tinted light-emitting glass according to claim 1, characterized in that: The temperature resistance of the PDLC film (3) is greater than 120°C.

6. The tinted light-emitting glass according to claim 1, characterized in that: The first glass plate (11) and the second glass plate (12) are selected from at least one of quartz glass, silicate glass and soda-lime glass.

7. The tinted light-emitting glass according to claim 1, characterized in that: The first glass plate (11) and the second glass plate (12) are selected from ordinary glass, tempered glass or double-layer glass.

8. A method for preparing tinted light-emitting glass according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: stacking the first glass plate (11), the first adhesive layer (21), the PDLC film (3), the second adhesive layer (22) and the second glass plate (12) in sequence; and sending the stacked structure into an autoclave for lamination, wherein the temperature in the autoclave can reach up to 120°C.

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