A high-reflectivity photochromic film
By introducing a high-reflectivity aluminum oxide layer and a submicron-scale right-angled triangular structure into the photochromic film, the light response efficiency is improved, solving the problem of slow response in traditional photochromic films and achieving an improvement in both the aesthetics and functionality of the shading system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG JINHUI NEW MATERIAL GRP CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional photochromic films have a slow response speed, making it difficult to meet the needs of real-time adjustment of light transmittance and affecting the aesthetics of the shading system.
A high-reflectivity photochromic film is designed, comprising a photochromic layer, an alumina layer, a substrate layer, and an adhesive layer. The photochromic layer is filled with spiropyran microcapsules, the alumina layer has high reflectivity, and the substrate layer has a submicron-scale right-angled triangular structure. The right-angled structure is used for directional reflection, increasing the number of times light passes through the photochromic layer.
It improves the photoresponse efficiency of spiropyran microcapsules, significantly reduces the radiation energy received by objects inside the membrane, and has the effects of UV protection, sun shading and cooling, thus enhancing the aesthetics of the shading system.
Smart Images
Figure CN224576313U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sunshade film technology, and in particular to a high-reflectivity photochromic film. Background Technology
[0002] Photochromic films are materials that can automatically adjust their light transmittance according to the intensity of sunlight. Traditional photochromic films often use a process of directly dispersing color-changing microparticles in a polymer matrix. When strong and weak light alternate, the response speed is slow and the color-changing lag is significant, making it difficult to meet the real-time adjustment requirements.
[0003] With the increasing demand for building energy conservation, the aesthetics of shading facilities have received much attention. Applying photochromic films to shading systems can help improve their appearance. Utility Model Content
[0004] The technical problem to be solved by this utility model embodiment is to provide a high-reflectivity photochromic film to improve the aesthetics of the sunshade film.
[0005] To address the above problems, the present invention proposes the following technical solutions:
[0006] A high-reflectivity photochromic film comprises, from top to bottom, a photochromic layer, an aluminum oxide layer, a substrate layer, and an adhesive layer;
[0007] The photochromic layer is filled with spiropyran microcapsules;
[0008] The alumina layer has a reflectivity of over 90%;
[0009] The substrate layer has a continuous array of submicron-sized right-angled triangles, with two right-angled sides of the right triangles in contact with the alumina layer and the long side of the right triangles in contact with the adhesive layer.
[0010] A further technical solution includes a protective layer located on the side of the photochromic layer away from the alumina layer.
[0011] A further technical solution is that the photochromic layer is provided with multiple transparent grooves, each groove is filled with spiropyran microcapsules, and the protective layer covers the opening of the grooves.
[0012] A further technical solution is that the depth of the groove is 0.5 to 1.0 μm and the wall thickness is 0.1 to 0.5 μm.
[0013] A further technical solution is that the thickness of the photochromic layer is 0.8–3.0 μm.
[0014] A further technical solution is that the total light transmittance of the groove is ≥90%.
[0015] A further technical solution is that the average particle size of the spiropyran microcapsules is 100-800 nm.
[0016] A further technical solution is that the volume of the groove is less than or equal to 1 μm. 3 .
[0017] A further technical solution is that the shape of the groove includes at least one of the following: rectangle, circle, triangle, ellipse, pentagon, and hexagon.
[0018] A further technical solution is that the thickness of the alumina layer is 100-200 nm.
[0019] A further technical solution is that the substrate layer is made of acrylic resin.
[0020] Compared with the prior art, the technical effects achieved by the embodiments of this utility model include:
[0021] The high-reflectivity photochromic film provided by this invention comprises, from top to bottom, a photochromic layer, an alumina layer, a substrate layer, and an adhesive layer. The photochromic layer is filled with spiropyran microcapsules. The alumina layer has a reflectivity of over 90%. The substrate layer has a continuous array of submicron-level right-angled triangles, with two right-angled sides of the triangles attached to the alumina layer and the longer side of the triangles attached to the adhesive layer. This invention utilizes the right-angled structure to further direct the light incident on the photochromic layer through the alumina layer and out of the photochromic layer. The light passes through the photochromic layer multiple times, improving the photoresponse efficiency of the spiropyran microcapsules. Simultaneously, due to the presence of the high-reflectivity alumina layer, light has difficulty penetrating the photochromic film, significantly reducing the radiant energy received by objects within the film, thus providing UV protection, sun shading, and "cooling" effects. Attached Figure Description
[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0025] Figure 1 This is a schematic diagram of the structure of the high-reflectivity photochromic film provided in an embodiment of the present invention;
[0026] Figure 2 This is a schematic diagram of the groove structure of the photochromic layer.
[0027] Figure Labels
[0028] 1. Protective layer; 2. Photochromic layer; 3. Alumina layer; 4. Substrate layer; 5. Adhesive layer; 6. Spiropyran microcapsules; 7. Groove. Detailed Implementation
[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Similar component reference numerals in the drawings represent similar components. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0031] It should also be understood that the terminology used in this specification of embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the present invention. As used in this specification of embodiments of the present invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0032] See Figures 1-2 This utility model embodiment provides a high-reflectivity photochromic film. As shown in the figure, from top to bottom, it includes a photochromic layer 2, an aluminum oxide layer 3, a substrate layer 4, and an adhesive layer 5.
[0033] The photochromic layer 2 is filled with spiropyran microcapsules 6;
[0034] The reflectivity of the alumina layer 3 is over 90%;
[0035] The substrate layer 4 has a continuous array of submicron-sized right-angled triangles, with two right-angled sides of the right triangles in contact with the alumina layer 3; the long side of the right triangles in contact with the adhesive layer 5; and the alumina layer 3 in contact with the photochromic layer 2.
[0036] In this embodiment, a submicron-sized right-angle structure is used to further reflect incident light that has passed through the photochromic layer 2 through the alumina layer 3 out of the photochromic layer 2. The light passes through the photochromic layer 2 multiple times, which improves the photoresponse efficiency of the spiropyran microcapsules. At the same time, due to the presence of the highly reflective alumina layer 3, light has difficulty penetrating the photochromic film, which significantly reduces the radiation energy received by objects inside the film and reduces the heat accumulation in the space inside the film, thus having the effects of UV protection, sun shading, and "cooling".
[0037] Understandably, the submicron-scale right-angled triangular structure can effectively reflect incident light multiple times to the photochromic layer in a directional manner, and the submicron-scale microstructure endows the film with flexibility and thinness.
[0038] In a specific embodiment, the thickness of the alumina layer 3 is 100-200 nm. The alumina layer 3 has good reflectivity and is an excellent sunshade material.
[0039] In one embodiment, the thickness of the alumina layer 3 is 100 nm.
[0040] In this embodiment, the thickness of the alumina layer 3 is 150 nm.
[0041] In a specific embodiment, the substrate layer 4 is made of acrylic resin. Acrylic resin has good moldability and uniformity.
[0042] The alumina layer 3 is deposited on the surface of the substrate layer 4 through a deposition process. Therefore, the alumina layer 3 also has the same right-angled triangular structure as the substrate layer 4.
[0043] In a specific embodiment, a protective layer 1 is also included, which is located on the side of the photochromic layer 2 away from the alumina layer 3. The protective layer 1 is a UV coating, mainly serving as the outermost layer to protect the photochromic layer 2 and provide a certain degree of protection and wear resistance.
[0044] In a specific embodiment, the photochromic layer 2 is provided with a plurality of transparent grooves 7, each groove 7 being filled with spiropyran microcapsules 6, and the protective layer 1 covering the opening of the groove 7.
[0045] In some embodiments, the depth of the groove 7 is 0.5 to 1.0 μm.
[0046] In this embodiment, the depth of groove 7 is 0.8 μm.
[0047] In another embodiment, the depth of the groove 7 is 1.0 μm.
[0048] The average particle size of the spiropyran microcapsule 6 is 100-800 nm, and the depth of the groove 7 can be set based on the particle size of the spiropyran microcapsule 6.
[0049] In some embodiments, the wall thickness of the groove 7 is 0.1 to 0.5 μm.
[0050] In this embodiment, the wall thickness of the groove 7 is 0.3 μm.
[0051] In another embodiment, the wall thickness of the groove 7 is 0.5 μm.
[0052] The groove 7 is made using nanoimprint technology; therefore, the substrate of the photochromic layer 2 is the same material as the groove 7.
[0053] See also Figure 1 It can be seen that the thickness of the photochromic layer 2 is higher than the average particle size of the spiropyran microcapsules 6. Since the surface of the alumina layer 3 also has a submicron right-angled triangular structure, when preparing the grooves 7 of the photochromic layer 2, the surface of the photochromic layer 2 is first leveled, and then the grooves 7 are nanoimprinted.
[0054] The total light transmittance of the groove 7 is ≥90%.
[0055] The substrate of the photochromic layer 2 is preferably PET (polyethylene terephthalate), which has the advantages of good transparency and high temperature resistance.
[0056] This embodiment constructs a tiny groove space to accommodate the spiropyran microcapsules 6, which helps to fix the spiropyran microcapsules 6. At the same time, it utilizes the specific light reflection path of the triangular structure to improve the photoresponse efficiency of the spiropyran microcapsules 6 and accelerate the color change reaction.
[0057] In a specific embodiment, the shape of the groove 7 includes at least one of rectangle, circle, triangle, ellipse, pentagon, and hexagon.
[0058] In this embodiment, the groove 7 is rectangular in shape.
[0059] In a specific embodiment, the adhesive layer 5 is attached to the substrate to achieve the adhesiveness of the high-reflectivity photochromic film. The adhesive layer 5 can be made of a resin with high viscosity, and this invention does not limit this application.
[0060] The method for preparing the high-reflectance photochromic film in this embodiment is described below.
[0061] A mold with a pre-designed submicron triangular structure is prepared in advance. Acrylic resin is injection molded according to the mold to obtain a substrate layer 4. Alumina is deposited on the surface of the right-angled structure of the substrate layer 4 to obtain an alumina layer 3. PET is coated on the surface of the alumina layer 3, and grooves 7 are prepared on the PET surface using nanoimprinting technology. Spiropyran microcapsules 6 are then prepared into a capsule liquid and filled into each groove 7 using a evaporation process. After the solvent evaporates, a UV coating is applied as a protective layer 1 to obtain the high-reflectivity photochromic film of this embodiment.
[0062] The high-reflectivity photochromic film provided in this embodiment of the invention comprises, from top to bottom, a protective layer, a photochromic layer, an alumina layer, a substrate layer, and an adhesive layer. The photochromic layer is filled with spiropyran microcapsules. The alumina layer has a reflectivity of over 90%. The substrate layer has a continuous array of submicron-level right-angled triangles, with two right-angled sides of each triangle adhering to the alumina layer. The longer side of each triangle is adhering to the adhesive layer. This invention utilizes the right-angled structure to further direct the light incident on the photochromic layer through the alumina layer, resulting in multiple light passes through the photochromic layer, thus improving the light efficiency of the spiropyran microcapsules. Simultaneously, due to the presence of the high-reflectivity alumina layer, light has difficulty penetrating the photochromic film, significantly reducing the radiation energy received by objects within the film, thus providing UV protection and a "cooling" effect.
[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0064] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.
[0069] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
[0070] The above description describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.
Claims
1. A high-reflectance photochromic film, characterized by, It includes a photochromic layer, an aluminum oxide layer, a substrate layer, and an adhesive layer; The photochromic layer is filled with spiropyran microcapsules; The alumina layer has a reflectivity of over 90%; The substrate layer has a continuous array of submicron-sized right-angled triangles, with two right-angled sides of the right triangles in contact with the alumina layer; the long side of the right triangles in contact with the adhesive layer; and the alumina layer in contact with the photochromic layer.
2. The high-reflectance photochromic film of claim 1, wherein, It also includes a protective layer located on the side of the photochromic layer away from the alumina layer.
3. The high-reflectance photochromic film of claim 2, wherein, The photochromic layer has multiple transparent grooves, each groove being filled with spiropyran microcapsules, and the protective layer covering the opening of the grooves.
4. The high-reflectance photochromic film of claim 3, wherein, The groove has a depth of 0.5~1.0μm and a wall thickness of 0.1~0.5μm.
5. The high-reflectance photochromic film of claim 4, wherein, The total light transmittance of the groove is ≥90%.
6. The high-reflectance photochromic film of claim 5, wherein, The average particle size of the spiropyran microcapsules is 100-800 nm.
7. The high-reflectance photochromic film of claim 6, wherein, The thickness of the photochromic layer is greater than the average particle size of the spiropyran microcapsules.
8. The high-reflectivity photochromic film as described in claim 7, characterized in that, The thickness of the photochromic layer is 0.8~3.0μm.
9. The high-reflectivity photochromic film as described in claim 1, characterized in that, The thickness of the alumina layer is 100-200 nm.
10. The high-reflectivity photochromic film as described in claim 1, characterized in that, The substrate layer is made of acrylic resin.