Photochromic reflective film

Abstract

The utility model provides a photochromic reflective film, and belongs to the technical field of reflective films. The problem that in the prior art, a reflective film is single in color is solved. The photochromic reflective film comprises a substrate layer, a reflective layer used for reflecting light is adhered to the upper side of the substrate layer, a surface layer used for protection is arranged above the reflective layer, a photochromic layer used for photochromism is further arranged between the surface layer and the reflective layer, the photochromic layer is adhered to the upper surface of the reflective layer, and the photochromic layer is arranged on the lower surface of the reflective layer. The surface layer is adhered to the upper surface of the photochromic layer through an adhesive layer. The utility model has the advantage that the color of the reflective film can be changed.

Description

Technical Field

[0001] The utility model belongs to the technical field of reflective films and relates to a photochromic reflective film. Background Art

[0002] Reflective film is a retroreflective material that has been made into a thin film and can be directly applied. It is widely used in transportation, advertising, construction and other fields. The existing reflective film usually includes a surface layer, a color layer, a reflective layer and a base layer adhered and arranged in sequence from top to bottom. The base layer provides a certain strength and stability for the reflective film. The reflective layer is responsible for reflecting the incident light back with a higher intensity. The protective film plays a dust-proof role to protect the color layer and the reflective layer and prevent them from being eroded by the external environment. The color layer is made of a monochrome translucent plate, which makes the existing reflective film single in color, non-discolorable, single in function, and limited in application scenarios. Summary of the Invention

[0003] The purpose of this utility model is to solve the above problems in the existing technology and propose a photochromic reflective film. The technical problem to be solved by this utility model is how to achieve the color change of the reflective film.

[0004] The purpose of this utility model can be achieved through the following technical solutions:

[0005] A photochromic reflective film includes a base layer, a reflective layer for reflecting light adhered to the upper side of the base layer, and a surface layer for protection is arranged above the reflective layer. The invention is characterized in that a photochromic layer for photochromism is further arranged between the surface layer and the reflective layer, the photochromic layer is adhered to the upper surface of the reflective layer, and the surface layer is adhered to the upper surface of the photochromic layer via an adhesive layer.

[0006] The photochromic reflective film is provided with a photochromic layer between the surface layer and the reflective layer. The photochromic layer can be used for photochromism, that is, it absorbs ultraviolet light in the light and causes the color of the photochromic layer to change. At the same time, when the ultraviolet light absorbed by the photochromic layer becomes stronger, the color of the photochromic layer will become darker and darker, thereby making the color of the reflective film darker and darker. When the photochromic layer no longer absorbs new ultraviolet light, the color of the photochromic layer will gradually return to its original color, thereby making the color of the reflective film return to its original state, thereby achieving the color change of the reflective film.

[0007] In the above-mentioned photochromic reflective film, a plurality of ink particles capable of temperature-sensitive color change are distributed in the photochromic layer. The ink particles have a higher color depth and can produce richer color changes, thereby better achieving the color change of the reflective film.

[0008] In the aforementioned photochromic reflective film, a plurality of glass microspheres are distributed in the reflective layer, and the refractive index of the glass microspheres is 2.0-2.2. The high refractive index of the glass microspheres improves the reflective efficiency of the reflective film, enabling it to maintain a good reflective effect under various lighting conditions.

[0009] In the above-mentioned photochromic reflective film, the thickness of the photochromic layer is 10 μm-100 μm, the thickness of the base layer is 50 μm-100 μm, the thickness of the reflective layer is 90 μm-150 μm, the thickness of the adhesive layer is 29 μm-31 μm, and the thickness of the surface layer is 1 μm-5 μm, making the thickness of the reflective film more reasonable.

[0010] Compared with the existing technology, the advantages of this photochromic reflective film are: by arranging a photochromic layer between the surface layer and the reflective layer, the photochromic layer can absorb ultraviolet light in the light and change the color of the photochromic layer. At the same time, when the ultraviolet light absorbed by the photochromic layer becomes stronger, the color of the photochromic layer will become darker and darker, thereby making the color of the reflective film darker and darker. When the photochromic layer no longer absorbs new ultraviolet light, the color of the photochromic layer will gradually return to its original color, thereby making the color of the reflective film return to its original state, thereby achieving the color change of the reflective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a partial cross-sectional view of the photochromic reflective film.

[0012] In the figure, 1, surface layer; 2, reflective layer; 3, base layer; 4, photochromic layer; 5, adhesive layer; 6, glass beads; 7, ink particles. DETAILED DESCRIPTION

[0013] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0014] A photochromic reflective film, referring to Figure 1 , including a base layer 3, a reflective layer 2 for reflecting light adhered to the upper side of the base layer 3, a surface layer 1 for protection is arranged above the reflective layer 2, and a photochromic layer 4 for photochromism is also arranged between the surface layer 1 and the reflective layer 2, the photochromic layer 4 is adhered to the upper surface of the reflective layer 2, and the surface layer 1 is adhered to the upper surface of the photochromic layer 4 through an adhesive layer 5.

[0015] Specifically, refer to Figure 1A plurality of ink particles 7 capable of changing color in response to temperature are distributed in the photochromic layer 4; a plurality of glass microbeads 6 are distributed in the reflective layer 2, and the refractive index of the glass microbeads 6 is 2.0-2.2, and preferably the refractive index of the glass microbeads 6 is 2.1.

[0016] In this embodiment, the thickness of the photochromic layer 4 is preferably 10 μm-100 μm; the thickness of the base layer 3 is preferably 50 μm-100 μm; the thickness of the reflective layer 2 is preferably 90 μm-150 μm; the thickness of the adhesive layer 5 is preferably 29 μm-31 μm; the thickness of the surface layer 1 is preferably 1 μm-5 μm; in this embodiment, the photochromic layer 4 is preferably made of existing materials such as benzotriazole additives, histamine additives and temperature-sensitive ink added to existing high-refractive acrylic resin, wherein the benzotriazole additives and histamine additives can absorb ultraviolet light in the light, and after absorbing the ultraviolet light in the light, they will convert the light energy into the maximum value. Finally, it is converted into thermal energy (light energy → chemical energy → thermal energy), causing the temperature of the entire photochromic layer 4 to rise, and then the temperature-sensitive ink in the photochromic layer 4 changes color with the change of temperature, and as the temperature rises, the color of the temperature-sensitive ink in the photochromic layer 4 will become darker and darker, thereby making the color of the reflective film darker and darker. When the benzotriazole additives and histamine additives in the photochromic layer no longer absorb new ultraviolet light, the temperature of the entire photochromic layer 4 can gradually return to normal, causing the color of the temperature-sensitive ink in the photochromic layer 4 to return to its original color, thereby making the color of the reflective film return to its original color, thereby achieving the color change of the reflective film.

[0017] The base layer 3 and the surface layer 1 provide the photochromic reflective film with excellent weather resistance, allowing it to be used outdoors for a long time without aging or fading. The photochromic reflective film can be widely used in transportation, advertising, construction and other fields, providing a safer and more practical solution for these fields.

[0018] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A photochromic reflective film comprising a base layer (3), a reflective layer (2) for reflecting light adhered to the upper side of the base layer (3), and a surface layer (1) for protection provided above the reflective layer (2), characterized in that: A photochromic layer (4) for photochromism is further provided between the surface layer (1) and the reflective layer (2); the photochromic layer (4) is adhered to the upper surface of the reflective layer (2); and the surface layer (1) is adhered to the upper surface of the photochromic layer (4) via an adhesive layer (5).

2. The photochromic reflective film according to claim 1, characterized in that: A plurality of ink particles (7) capable of temperature-sensitive color change are distributed in the photochromic layer (4).

3. The photochromic reflective film according to claim 1, characterized in that: A plurality of glass micro-beads (6) are distributed in the reflective layer (2), and the refractive index of the glass micro-beads (6) is 2.0-2.

2.

4. The photochromic reflective film according to claim 1, 2 or 3, characterized in that: The thickness of the photochromic layer (4) is 10 μm-100 μm, the thickness of the base layer (3) is 50 μm-100 μm, the thickness of the reflective layer (2) is 90 μm-150 μm, the thickness of the adhesive layer (5) is 29 μm-31 μm, and the thickness of the surface layer (1) is 1 μm-5 μm.

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