Window film

Abstract

The utility model relates to a window film. The window film comprises a supporting layer and an elastic layer. The supporting layer comprises a base material layer and a coating layer, the coating layer is arranged on at least one surface of the base material layer, and the base material layer is a PET layer or a PVDF layer. The elastic layer is arranged on the surface of one side of the supporting layer, and the elastic layer is a TPU layer or a PVC layer. The window film is long in service life, can be externally attached to the outer side of window glass, and can effectively reduce the construction difficulty.

Description

Technical Field

[0001] The present application relates to the field of thin film technology, and in particular to a window film. Background Art

[0002] Window film is a thin film material that can be attached to the surface of building window glass or car window glass to improve the optical properties and strength of the glass. Window film can generally be attached to the inner surface of the glass or the outer surface of the glass. However, the current anti-aging performance of window film is not strong, resulting in a generally short service life of external window film. In addition, with the development of the industry, more and more glass is curved, that is, curved window glass. When applying window film to curved window glass, the construction workers need to have a high level of technical skills, and the construction is difficult. When installing the window film, it is very easy to cause the window film to be damaged, the installation fails, or the material is wasted. Summary of the invention

[0003] Based on this, it is necessary to provide a window film for the problem of how to increase the service life of the window film and reduce the difficulty of construction.

[0004] A window film, comprising:

[0005] A support layer, the support layer comprising a substrate layer and a coating layer, the coating layer being disposed on at least one surface of the substrate layer, the substrate layer being a PET layer or a PVDF layer;

[0006] The elastic layer is arranged on one side surface of the supporting layer, and the elastic layer is a TPU layer or a PVC layer.

[0007] The technical solution is further described below:

[0008] In one embodiment, the window film further includes a mounting adhesive layer, and the mounting adhesive layer is disposed on a surface of the supporting layer that is away from the elastic layer.

[0009] In one embodiment, the window film further includes a first release layer, and the first release layer is disposed on a side of the installation adhesive layer away from the support layer.

[0010] In one embodiment, the window film further includes a composite adhesive layer, and the composite adhesive layer is disposed between the support layer and the elastic layer.

[0011] In one embodiment, the coating layer is disposed between the substrate layer and the composite adhesive layer.

[0012] In one embodiment, the window film further includes a hardening repair layer, and the hardening repair layer is disposed on a side of the elastic layer away from the supporting layer.

[0013] In one embodiment, the window film further includes a second release layer, and the second release layer is disposed on a side of the hardened repair layer away from the elastic layer.

[0014] In one embodiment, the thickness of the substrate layer is 6 micrometers to 50 micrometers.

[0015] In one embodiment, the thickness of the elastic layer is 10 micrometers to 200 micrometers.

[0016] In one embodiment, the substrate layer and / or the elastic layer is provided with an ultraviolet absorber.

[0017] The above-mentioned window film includes a supporting layer and an elastic layer which are stacked, wherein the base material layer of the supporting layer is a PET layer or a PVDF layer, and the elastic layer is a TPU layer or a PVC layer, so that the window film has both the good supporting performance of the PET layer or the PVDF layer and the good weather resistance and ductility of the TPU layer or the PVC layer. Compared with the traditional double-layer PET structure window film, the window film of the present application has the better weather resistance of the TPU layer or the PVC layer, so that the window film can maintain a longer service life when attached to the window glass. At the same time, thanks to the good ductility of the TPU layer or the PVC layer, the outer layer of the window film is easier to be stretched, so that the window film of the present application is easier to construct on curved glass than the traditional double-layer PET structure. Compared with the window film with a double-layer TPU structure, the window film of the present application has the good supporting performance of the PET layer or the PVDF layer because the substrate layer has good supporting performance, that is, the ductility of the PET layer or the PVDF layer is weaker than that of the TPU layer, and it will not produce too much deformation when stretched, so that the coating layer on the substrate layer will not be easily torn due to the stretching deformation of the substrate layer, thereby ensuring the stability of the coating layer, and then ensuring the stability of the appearance, thermal insulation performance and service life of the window film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0021] FIG. 1 is a schematic structural diagram of a window film according to an embodiment.

[0022] FIG. 2 is a schematic structural diagram of a window film according to another embodiment.

[0023] Description of reference numerals:

[0024] 10. Support layer; 11. Base material layer; 12. Coating layer; 20. Elastic layer; 30. Mounting adhesive layer; 40. First release layer; 50. Composite adhesive layer; 60. Hardening repair layer; 70. Second release layer. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0031] In the window films of the related art, a double-layer PET (Polyethylene terephthalate, polyester resin) structure or a double-layer TPU structure is mostly used. However, PET has poor weather resistance. When used alone as a substrate for external window films, the service life of external window films is generally not long. At the same time, PET has poor ductility. When applying window films to curved window glass, construction workers are required to have a high level of technical skills, and the construction is difficult. TPU is a thermoplastic polyurethane rubber. Although TPU has good ductility and is easy to stretch, when it is used alone as a substrate for window films, if TPU is coated, the expansion and contraction of TPU caused by the tension of the coating will cause internal damage to the coating layer. In subsequent construction, the coating layer with internal damage is more likely to break due to the stretching of the TPU layer again, affecting the performance and service life of the coating layer, and further affecting the appearance, thermal insulation performance and service life of the window film.

[0032] Referring to Figure 1, based on this, an embodiment of the present application provides a window film that is easy to install and has a long service life. Specifically, the window film of one embodiment includes a support layer 10 and an elastic layer 20 stacked from the inside to the outside, wherein the support layer 10 includes a substrate layer 11 and a coating layer 12, and the coating layer 12 is arranged on at least one surface of the substrate layer 11, that is, the coating layer 12 can be arranged on one surface of the substrate layer 11, or on both surfaces of the substrate layer 11. Further, the substrate layer 11 is a PET (Polyethylene terephthalate, polyester resin) layer or a PVDF (polyvinylidene difluoride, polyvinylidene fluoride) layer. The elastic layer 20 is arranged on one side surface of the support layer 10, and the elastic layer 20 is a TPU layer or a PVC (Polyvinylchloride, polyvinyl chloride) layer, wherein the TPU layer is thermoplastic polyurethane rubber.

[0033] Specifically, during installation, the side of the support layer 10 facing away from the elastic layer 20 can be attached to the glass surface, even if the support layer 10 is located on the inside and the elastic layer 20 is located on the outside, the coating layer 12 is used to achieve the heat insulation, shading and other functions of the window film.

[0034] The above-mentioned window film includes a stacked support layer 10 and an elastic layer 20, wherein the substrate layer 11 of the support layer 10 is a PET layer or a PVDF layer, and the elastic layer 20 is a TPU layer or a PVC layer, so that the window film has both the good support performance of the PET layer or the PVDF layer and the good weather resistance and ductility of the TPU layer or the PVC layer. Compared with the traditional double-layer PET structure window film, the window film of the present application has the better weather resistance of the TPU layer or the PVC layer, so that the window film can maintain a longer service life when attached to the window glass. At the same time, thanks to the good ductility of the TPU layer or the PVC layer, the outer layer of the window film is easier to stretch, so that the window film of the present application is easier to construct on curved glass than the traditional double-layer PET structure. Compared with the window film with a double-layer TPU structure, the window film of the present application has good supporting performance of the PET layer or the PVDF layer because the substrate layer 11 has good supporting performance, that is, the ductility of the PET layer or the PVDF layer is weaker than that of the TPU layer, and it will not produce too much deformation when stretched, so that the coating layer 12 on the substrate layer 11 will not be easily torn due to the stretching deformation of the substrate layer 11, thereby ensuring the stability of the coating layer 12, and further ensuring the stability of the appearance, thermal insulation performance and service life of the window film.

[0035] Referring to FIG. 2 , in one embodiment, the window film further includes an installation adhesive layer 30, and the installation adhesive layer 30 is disposed on a surface of the support layer 10 on one side facing away from the elastic layer 20. Specifically, the installation adhesive layer 30 is used to bond with the window glass to install the window film on the glass surface. Optionally, in one embodiment, the installation adhesive layer 30 can be a pressure-sensitive adhesive. The thickness of the installation adhesive layer 30 is 2 microns to 50 microns, for example, 2 microns, 10 microns, 15 microns, 25 microns, 30 microns, 40 microns, 50 microns, etc. can be selected. The installation adhesive layer 30 of the above thickness can be well bonded to the window glass to firmly fix the window film on the window glass.

[0036] Optionally, in one embodiment, the mounting adhesive layer 30 may be provided with an ultraviolet absorber, so that the mounting adhesive layer 30 has the function of ultraviolet absorption, thereby improving the ultraviolet absorption and aging resistance of the window film. Optionally, the ultraviolet absorber is one or a combination of salicylates, benzophenones, benzotriazoles, triazines, and hindered amines. In one embodiment, the mounting adhesive layer 30 may also be provided with a colorant, so that the window film can produce a corresponding color by adjusting the color of the colorant. In addition, adjusting the content of the colorant can also affect the light transmittance of the window film.

[0037] Referring to FIG. 2 , optionally, in one embodiment, the window film further includes a first release layer 40, which is disposed on the side of the installation adhesive layer 30 away from the support layer 10. The first release layer 40 is used to protect the installation adhesive layer 30 to prevent the installation adhesive layer 30 from solidifying or adhering to impurities during storage or transportation of the window film, thereby affecting the viscosity of the installation adhesive layer 30. Further, when the window film needs to be attached to the window glass, the first release layer 40 can be partially or completely separated from the installation adhesive layer 30, and then the installation adhesive layer 30 exposed to the outside can be adhered to the window glass to achieve the attachment of the window film. Optionally, in one embodiment, the first release layer 40 can be a release paper, and the thickness of the first release layer 40 is 10 microns to 50 microns, for example, 10 microns, 15 microns, 25 microns, 30 microns, 40 microns, 50 microns, etc. can be selected.

[0038] Referring to FIG. 2 , in one embodiment, the window film further includes a composite adhesive layer 50, which is disposed between the support layer 10 and the elastic layer 20. Specifically, the composite adhesive layer 50 is used to bond the support layer 10 and the elastic layer 20, so that the support layer 10 and the elastic layer 20 are composited together to prevent the support layer 10 and the elastic layer 20 from being separated when being pasted to the window glass. Optionally, in one embodiment, the composite adhesive layer 50 may be glue, and the thickness of the composite adhesive layer 50 may be 2 microns to 50 microns, for example, 2 microns, 10 microns, 15 microns, 25 microns, 30 microns, 40 microns, 50 microns, etc. The composite adhesive layer 50 of the above thickness may better bond the support layer 10 and the elastic layer 20, and when the window film is stretched and extended, the support layer 10 and the elastic layer 20 are not easily separated.

[0039] Optionally, in one embodiment, a UV absorber may be provided in the composite adhesive layer 50, so that the composite adhesive layer 50 has the function of absorbing UV rays, thereby improving the UV absorption and aging resistance of the window film. Optionally, the UV absorber is one or a combination of salicylates, benzophenones, benzotriazoles, triazines, and hindered amines. In one embodiment, a colorant may also be provided in the composite adhesive layer 50, so that the window film can produce a corresponding color by adjusting the color of the colorant. In addition, adjusting the content of the colorant can also affect the light transmittance of the window film.

[0040] Optionally, in one embodiment, the coating layer 12 is disposed between the substrate layer 11 and the composite adhesive layer 50. That is, the coating layer 12 is disposed on the side of the substrate layer 11 close to the support layer 10, so that both sides of the coating layer 12 can be protected by the substrate layer 11 and the composite adhesive layer 50 respectively, so as to prevent the coating layer 12 from being torn by external force, thereby extending the service life of the energy-saving window film.

[0041] Optionally, in one embodiment, the coating layer 12 may be a metal coating, an oxide coating or a nitride coating. The coating layer 12 may be formed on the surface of the substrate layer 11 by a vacuum sputtering coating process. The coating layer 12 may be provided with coatings of different materials and different numbers, so that the coating layer 12 can have different reflection and transmission properties for light of different wavelengths, thereby making the window film have better heat insulation performance. Among them, the metal coating may include pure metals, such as aluminum, titanium, copper or silver, or alloys, such as nickel-chromium alloys or stainless steel. The oxide coating may include titanium oxide, niobium oxide, cesium oxide, silicon oxide, indium tin oxide, zinc oxide or zinc aluminum oxide. The nitride coating may include titanium nitride, etc. Preferably, the thickness of the coating layer 12 may be 5nm to 500nm. For example, it may be 5nm, 10nm, 25nm, 50nm, 100nm, 200nm, 300nm, 400nm, 500nm. The coating layer 12 of the above thickness has good heat insulation and thermal insulation performance, and when the window film is attached to a curved window glass with a large curvature, the coating layer 12 is not easily stretched and damaged.

[0042] Referring to FIG. 2 , in one embodiment, the window film further includes a hardening repair layer 60, which is disposed on the side of the elastic layer 20 away from the support layer 10. The hardening repair layer 60 is used to protect the elastic layer 20, ensuring that the elastic layer 20 is not scratched during the installation and use of the window film, thereby increasing the service life of the window film. Preferably, the thickness of the hardening repair layer 60 is 1 micron to 20 microns.

[0043] Optionally, in one embodiment, the window film further comprises a second release layer 70, which is disposed on the side of the hardening repair layer 60 away from the elastic layer 20. The second release layer 70 is used to protect the hardening repair layer 60 to prevent the hardening repair layer 60 from being scratched during the storage, transportation and installation of the window film. Specifically, when the window film needs to be attached to the window glass, the window film and the window glass can be bonded first. During the bonding process, the second release layer 70 can be scraped by a scraper to exhaust the air between the window film and the window glass to prevent bubbles from appearing between the window film and the window glass. After the window film is completely attached to the window glass, the second release layer 70 is torn off to prevent the scraper from scratching the hardening repair layer 60. Optionally, in one embodiment, the second release layer 70 can be a release paper, and the second release layer 70 is 10 microns to 50 microns, for example, 10 microns, 15 microns, 25 microns, 30 microns, 40 microns, 50 microns, etc. can be selected.

[0044] Optionally, in one embodiment, the substrate layer 11 is provided with an ultraviolet absorber, so that the substrate layer 11 has the function of ultraviolet absorption, thereby improving the ultraviolet absorption and aging resistance of the window film. Optionally, the ultraviolet absorber is one or a combination of salicylates, benzophenones, benzotriazoles, triazines, and hindered amines.

[0045] Optionally, in one embodiment, the thickness of the substrate layer 11 is 6 microns to 50 microns. For example, 6 microns, 10 microns, 15 microns, 25 microns, 30 microns, 40 microns, 50 microns, etc. can be selected. The substrate layer 11 of the above thickness has good support and can support the coating layer 12 to ensure that the coating layer 12 is not easily stretched and damaged.

[0046] Optionally, in one embodiment, the elastic layer 20 is provided with an ultraviolet absorber, so that the elastic layer 20 has the function of ultraviolet absorption, thereby improving the ultraviolet absorption and aging resistance of the window film. Optionally, the ultraviolet absorber is one or a combination of salicylates, benzophenones, benzotriazoles, triazines, and hindered amines.

[0047] Optionally, in one embodiment, the thickness of the elastic layer 20 is 10 microns to 200 microns. For example, 10 microns, 25 microns, 30 microns, 40 microns, 50 microns, 100 microns, 150 microns, 200 microns, etc. can be selected. The substrate layer 11 with the above thickness has good ductility, can be installed on curved window glass with a large curvature, and is not easy to be stretched and damaged.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A window film, characterized in that: include: A support layer, the support layer comprising a substrate layer and a coating layer, the coating layer being disposed on at least one surface of the substrate layer, the substrate layer being a PET layer or a PVDF layer; The elastic layer is arranged on one side surface of the supporting layer, and the elastic layer is a TPU layer or a PVC layer.

2. The window film according to claim 1, characterized in that: The window film further comprises an installation adhesive layer, and the installation adhesive layer is arranged on a surface of the support layer on a side away from the elastic layer.

3. The window film according to claim 2, characterized in that: The window film further includes a first release layer, and the first release layer is arranged on a side of the installation adhesive layer away from the support layer.

4. The window film according to claim 1, characterized in that: The window film further comprises a composite adhesive layer, and the composite adhesive layer is arranged between the supporting layer and the elastic layer.

5. The window film according to claim 4, characterized in that: The coating layer is arranged between the substrate layer and the composite adhesive layer.

6. The window film according to claim 1, characterized in that: The window film further comprises a hardening repair layer, and the hardening repair layer is arranged on a side of the elastic layer away from the supporting layer.

7. The window film according to claim 6, characterized in that: The window film further includes a second release layer, and the second release layer is arranged on a side of the hardened repair layer away from the elastic layer.

8. The window film according to claim 1, characterized in that: The thickness of the substrate layer is 6 micrometers to 50 micrometers.

9. The window film according to claim 1, characterized in that: The thickness of the elastic layer is 10 micrometers to 200 micrometers.

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