Window film

Abstract

The utility model provides a window film with a laminated structure, which comprises a first film layer, a first adhesive layer, a second film layer, a second adhesive layer and a stripping film which are sequentially arranged from top to bottom, and the first film layer and the second film layer respectively comprise a base material and a near infrared ray absorption layer arranged on the upper surface of the base material. And the near-infrared absorption layer contains a near-infrared absorbent. The first thin film layer and the second thin film layer which are bonded with each other are arranged, and each of the first thin film layer and the second thin film layer comprises a base material and a near-infrared ray absorbing layer which is arranged on the upper surface of the base material and contains a near-infrared ray absorbent, so that the near-infrared ray shielding film has excellent near-infrared ray shielding performance; according to the window, near infrared rays can be effectively prevented from entering a room through a glass plate or a resin plate of the window, specifically, more than 99% of near infrared rays can be shielded, and the transmittance of the near infrared rays is less than 1%.

Description

Technical Field

[0001] The utility model relates to the technical field of window films, in particular to a window film with a laminated structure. Background Art

[0002] At present, transparent glass plates or resin plates that can transmit sunlight are generally installed on the windows of buildings, cars, refrigerators, etc. The near-infrared rays in sunlight are also called heat rays, which are the cause of temperature rise. In order to reduce the near-infrared rays in sunlight from penetrating the glass plates or resin plates of the windows and entering the room, which causes the indoor temperature to rise, near-infrared shielding window films are generally attached to the glass plates or resin plates of the windows. In the existing near-infrared shielding window films, near-infrared rays are generally shielded by providing a shielding layer containing near-infrared absorbers such as antimony-doped tin oxide (ATO), tin-doped indium oxide (ITO) or cesium tungsten oxide (CWO) on a transparent film. However, the above-mentioned existing near-infrared shielding window films have the problem that the near-infrared shielding properties are not sufficient and cannot effectively inhibit the near-infrared rays from penetrating the glass plates or resin plates of the windows and entering the room. If the content of near infrared absorber (such as cesium tungsten oxide (CWO)) in the shielding layer is simply increased in order to improve the near infrared shielding property of the near infrared shielding window film, the hardness of the shielding layer will decrease, thereby affecting the quality of the near infrared shielding window film. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a window film with a laminated structure, which can ensure the quality of the window film while having good near-infrared shielding properties, and can effectively inhibit near-infrared rays from penetrating the glass plate or resin plate of the window into the room.

[0004] To achieve the above object, the utility model provides a window film with a laminated structure, including a first film layer, a first adhesive layer, a second film layer, a second adhesive layer and a peeling film arranged in sequence from top to bottom, wherein the first film layer and the second film layer both include a substrate and a near infrared absorbing layer arranged on the upper surface of the substrate, wherein the near infrared absorbing layer contains a near infrared absorbing agent. Based on the window film with the above structure, by making the window film include two layers of near infrared absorbing layers containing near infrared absorbing agents, when the window film is attached to the window, it can effectively inhibit near infrared rays from penetrating the glass plate or resin plate of the window into the room, thereby avoiding the indoor temperature from rising.

[0005] Furthermore, the near infrared absorber is cesium tungsten oxide. By using the near infrared absorption layer containing cesium tungsten oxide to form the window film, the window film can have good weather resistance, near infrared absorption performance and visible light transmittance.

[0006] Furthermore, the substrate is a polyethylene terephthalate film.

[0007] Furthermore, the near infrared absorbing layer in the first film layer is a hard coating layer containing a hard coating agent, and the hard coating agent is acrylate and / or urethane acrylate. By setting the near infrared absorbing layer in the first film layer as a hard coating layer, the surface of the window film can be prevented from being damaged, thereby ensuring the appearance of the window film and the near infrared shielding performance.

[0008] Furthermore, the first adhesive layer and / or the second adhesive layer is an acrylic adhesive layer containing an ultraviolet absorber. By forming the acrylic adhesive layer containing an ultraviolet absorber, the window film can have good weather resistance.

[0009] Furthermore, the thickness of the near infrared absorbing layer is 2 to 10 μm, the thickness of the substrate is 20 to 75 μm, and the thickness of the first adhesive layer and the second adhesive layer is 5 to 40 μm. By forming the near infrared absorbing layer, substrate, first adhesive layer and second adhesive layer with the above thicknesses, the window film can have good near infrared shielding properties, weather resistance, operability and other properties.

[0010] Furthermore, the release film is a polyethylene terephthalate film coated with a polysiloxane release agent, so that the release film can have good performance and reduce costs.

[0011] Furthermore, in the release film, the thickness of the polysiloxane-based release agent is 50 to 300 nm, and the thickness of the polyethylene terephthalate film is 25 to 100 μm.

[0012] Furthermore, the content of cesium tungsten oxide in the near infrared absorbing layer is 5 to 60 wt %. Preferably, the content of cesium tungsten oxide in the near infrared absorbing layer is 10 to 40 wt %. In this way, the window film can have good near infrared absorbing performance.

[0013] As described above, the window film with a laminated structure involved in the utility model has good near-infrared shielding properties by arranging a first film layer and a second film layer that are bonded to each other, and making the first film layer and the second film layer both include a substrate and a near-infrared absorbing layer containing a near-infrared absorber arranged on the upper surface of the substrate. It can effectively inhibit near-infrared rays from entering the room through the glass plate or resin plate of the window. Specifically, the window film involved in the utility model can block more than 99% of near-infrared rays, and the transmittance of near-infrared rays is less than 1%. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the window film in this application.

[0015] Figure 2This is a schematic diagram for explaining the first manufacturing process of the window film in the present application.

[0016] Figure 3 It is a schematic diagram for explaining the second manufacturing process of the window film in the present application.

[0017] Figure 4 This is a schematic diagram for explaining the third manufacturing process of the window film in the present application.

[0018] Component number description

[0019] 10 Window Film

[0020] 11a First film layer

[0021] 11b Second film layer

[0022] 111 Substrate

[0023] 112 Near infrared absorption layer

[0024] 12a First adhesive layer

[0025] 12b Second adhesive layer

[0026] 13 Peel off the film DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0029] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0030] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0031] like Figure 1 As shown, the window film 10 with a laminated structure involved in the utility model includes a first film layer 11a, a first adhesive layer 12a, a second film layer 11b, a second adhesive layer 12b and a peeling film 13 arranged in sequence from top to bottom, and the first film layer 11a and the second film layer 11b each include a substrate 111 and a near infrared absorbing layer 112 arranged on the upper surface of the substrate 111, and the near infrared absorbing layer 112 contains a near infrared absorbing agent. That is, the first film layer 11a and the second film layer 11b are bonded together by the first adhesive layer 12a, and the lower surface of the second film layer 11b is bonded with the peeling film 13 by the second adhesive layer 12b. In this way, by making the window film 10 include two layers of near infrared absorbing layers 112 containing near infrared absorbing agents, when the window film 10 is attached to the window, it can effectively inhibit near infrared rays from penetrating the glass plate or resin plate of the window into the room. Specifically, the window film 10 can block more than 99% of near infrared rays, and the transmittance of near infrared rays is less than 1%.

[0032] The near-infrared absorber contained in the near-infrared absorption layer 112 is not particularly limited, and may be, for example, antimony-doped tin oxide (ATO), tin-doped indium oxide (ITO) or tungsten oxide, etc. In terms of weather resistance, near-infrared absorption performance and visible light transmittance, the near-infrared absorber is preferably a composite tungsten oxide. Further, from the perspective of the optical properties and weather resistance of the near-infrared absorber, cesium tungsten oxide (CWO) is more preferred. In addition, the thickness of the near-infrared absorption layer 112 is not particularly limited. From the perspective of the near-infrared shielding, weather resistance and operability of the window film 10, the thickness of the near-infrared absorption layer 112 is preferably 2 to 10 μm. Further, from the perspective of near-infrared absorption performance, dispersibility, etc., the content of cesium tungsten oxide in the near-infrared absorption layer 112 is preferably 5 to 60% by weight, and more preferably 10 to 40% by weight.

[0033] The substrate 111 used in the window film 10 is not particularly limited, and can be appropriately selected from various transparent plastic films as needed. For example, it can be a film made of polyolefin resins such as polyethylene, polypropylene, poly-4-methylpentene-1, polybutene-1, polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polycarbonate resins, polyvinyl chloride resins, polyphenylene sulfide resins, polyether sulfone resins, polyethylene sulfide resins, polyphenylene ether resins, styrene resins, acrylic resins, polyamide resins, polyimide resins, cellulose acetate and other cellulose resins or their laminated films. Among them, the substrate 111 is preferably a polyethylene terephthalate film. In addition, the thickness of the substrate 111 is not particularly limited. Considering the near-infrared shielding performance, weather resistance and operability of the window film 10, the thickness of the substrate 111 is preferably 20 to 75 μm.

[0034] Furthermore, the near infrared absorbing layer 112 in the first film layer 11a is preferably a hard coating layer containing a hard coating agent. The hard coating agent is not particularly limited and can be formed using known materials, generally a compound that can be crosslinked and cured by irradiation with ultraviolet rays or electron beams, preferably acrylate and / or urethane acrylate. In addition to the hard coating agent and the near infrared absorbing agent, the hard coating forming material used to form the hard coating layer may also contain various additives, such as antioxidants, light stabilizers, leveling agents, defoaming agents, etc., and solvents may be added as needed to adjust the concentration and viscosity suitable for coating. By setting the near infrared absorbing layer 112 in the first film layer 11a as a hard coating layer, it is possible to prevent the surface of the window film 10 from being damaged, thereby ensuring the appearance and near infrared shielding performance of the window film 10.

[0035] In addition, an antifouling coating may be provided on the hard coating layer as required. The antifouling coating may be formed by coating a coating liquid generally containing a fluorine-based resin on the hard coating layer using currently known methods such as rod coating, knife coating, roller coating, blade coating, die coating, gravure coating, etc., and then drying the coating film.

[0036] Furthermore, the adhesive constituting the first adhesive layer 12a and the second adhesive layer 12b is not particularly limited, and can be selected from various currently known adhesives as needed. In terms of weather resistance, the first adhesive layer 12a and the second adhesive layer 12b can be acrylic adhesive layers, preferably acrylic adhesive layers containing ultraviolet absorbers. In addition, the thickness of the first adhesive layer 12a and the second adhesive layer 12b is not particularly limited. In terms of weather resistance and operability of the window film 10, the thickness of the first adhesive layer 12a and the second adhesive layer 12b is preferably 5 to 40 μm.

[0037] Furthermore, regarding the release film 13, for example, it can be a product obtained by coating a release agent on a plastic film such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyester films, polypropylene or polyethylene polyolefin films, etc. As the release agent, polysiloxane-based, fluorine-based, long-chain alkane-based, etc. can be used. Considering the performance and cost of the release film, it is preferred that the release film 13 is a polyethylene terephthalate film coated with a polysiloxane-based release agent. In addition, the thickness of the polysiloxane-based release agent and the polyethylene terephthalate film is not particularly limited. Considering the performance and other aspects, it is preferred that the thickness of the polysiloxane-based release agent is 50 to 300 nm, and the thickness of the polyethylene terephthalate film is 25 to 100 μm.

[0038] Hereinafter, a manufacturing process of the window film 10 having a laminated structure according to the present invention will be described.

[0039] like Figures 2 to 4 As shown, the manufacturing process of the window film 10 having a laminated structure is as follows:

[0040] First manufacturing process: Figure 2 As shown, near infrared absorbing layers 112 are formed on a plurality of substrates 111, respectively, thereby manufacturing a plurality of thin film layers, and the near infrared absorbing layers 112 are preferably hard coating layers. Specifically, a near infrared absorbing layer forming material containing a near infrared absorbing agent and a hard coating agent is applied to the upper surface of the substrate 111 by a conventionally known method such as a rod coating method, a knife coating method, a roller coating method, a blade coating method, a die coating method, a gravure coating method, etc., to form a coating film and dry it. Then, ultraviolet rays or electron beams are irradiated on the dried coating film to cure the coating film, thereby forming a hard coating layer containing a near infrared absorbing agent.

[0041] Second manufacturing process: Figure 3 As shown, an adhesive is coated on a release film 13, and then the release film 13 is bonded to the lower surface of a substrate 111 in one film layer manufactured by the first manufacturing process, thereby manufacturing a semi-finished window film.

[0042] The third manufacturing process: Figure 4 As shown, an adhesive is applied on the lower surface of the substrate 111 in another film layer manufactured by the first manufacturing process, and then the other film layer is bonded to the upper surface of the window film semi-finished product manufactured by the second manufacturing process, thereby manufacturing a window film 10 with a laminated structure.

[0043] The utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A window film, characterized in that: The window film has a stacked structure, comprising a first film layer (11a), a first adhesive layer (12a), a second film layer (11b), a second adhesive layer (12b) and a peeling film (13) arranged in sequence from top to bottom, the first film layer (11a) and the second film layer (11b) both comprising a substrate (111) and a near-infrared absorbing layer (112) arranged on the upper surface of the substrate (111), and the near-infrared absorbing layer (112) contains a near-infrared absorber.

2. The window film according to claim 1, characterized in that: The near infrared absorber is cesium tungsten oxide.

3. The window film according to claim 1, characterized in that: The substrate (111) is a polyethylene terephthalate film.

4. The window film according to any one of claims 1 to 3, characterized in that: The near infrared absorbing layer (112) in the first film layer (11a) is a hard coating layer containing a hard coating agent, and the hard coating agent is acrylate or urethane acrylate.

5. The window film according to any one of claims 1 to 3, characterized in that: The first adhesive layer (12a) and / or the second adhesive layer (12b) is an acrylic adhesive layer containing an ultraviolet absorber.

6. The window film according to any one of claims 1 to 3, characterized in that: The thickness of the near infrared absorption layer (112) is 2 to 10 μm, the thickness of the substrate (111) is 20 to 75 μm, and the thickness of the first adhesive layer (12a) and the second adhesive layer (12b) is 5 to 40 μm.

7. The window film according to any one of claims 1 to 3, characterized in that: The release film (13) is a polyethylene terephthalate film coated with a polysiloxane-based release agent.

8. The window film according to claim 7, characterized in that: In the release film (13), the thickness of the polysiloxane-based release agent is 50 to 300 nm, and the thickness of the polyethylene terephthalate film is 25 to 100 μm.

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