Bending-resistant heat insulation window film

Abstract

The utility model discloses a bending-resistant heat insulation window film which comprises a composite base material layer, a heat insulation layer, a heat insulation layer and a heat insulation layer, wherein the composite base material layer is provided with a first surface and a second surface along the film thickness direction; the mounting adhesive layer is arranged on the first surface; the composite base material layer comprises a TPU base material layer and a PET base material layer, and the TPU base material layer is close to the second surface; the heat insulation layer is clamped between the TPU base material layer and the PET base material layer, and / or is arranged on the second surface of the composite base material layer. The bending-resistant heat-insulating window film is reasonable in structure, high-strength and stable support is provided through the PET base material layer, the basic shape of the window film is kept, the dimensional stability of the window film in long-term use is ensured, the softness and plasticity of the window film are improved in combination with the arrangement of the TPU base material layer, and the window film is suitable for covering a complex curved surface; the heat insulation layer optimizes the heat insulation effect of the window film.

Description

Technical Field

[0001] The utility model relates to the technical field of thin films, in particular to a bending-resistant heat-insulating window film. Background Art

[0002] With the development of industry and the shortage of energy, people are becoming more and more aware of energy conservation. Usually, the heat-blocking performance of vehicle glass is poor, and heat is transferred to the room through the window, thereby increasing the air conditioning refrigeration load and increasing energy consumption in summer; in winter, the heat loss in the room is large because the glass does not keep warm. At present, there are several types of window films on the market: colored films are used to block strong sunlight, but they do not have a heat-insulating effect; metal films have a heat-insulating effect, but they have low clarity and high reflection, which can easily cause visual fatigue and lead to accidents; metal composite films have a heat-insulating effect, but the preparation is complex, the cost is high, and they are easily oxidized, resulting in reduced heat-insulating effect and shortened service life.

[0003] In the prior art, CN202986256U discloses a new type of heat-insulating window film, including super-hard scratch-resistant coating, PET film, heat-insulating pressure-sensitive adhesive, PET film, pressure-sensitive adhesive, and release film stacked in sequence. Although the window film has a heat-insulating effect, it has poor bending performance and is prone to warping or cracking at the bend, which not only affects the appearance of the window film, but also affects the quality of the window film.

[0004] Therefore, it is necessary to improve the window film in the prior art. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects existing in the prior art and provide a bending-resistant heat-insulating window film with excellent heat-insulating effect. By compounding the PET substrate layer and the TPU substrate layer, it not only has high supporting strength and stability, but also has excellent dimensional stability and is suitable for covering complex curved surfaces, has a prolonged service life and a wide range of applications.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: a bending-resistant heat-insulating window film, comprising:

[0007] A composite substrate layer having a first surface and a second surface along a film thickness direction;

[0008] An installation adhesive layer is disposed on the first surface;

[0009] The composite substrate layer includes a TPU substrate layer and a PET substrate layer, wherein the TPU substrate layer is close to the second surface; and further includes a heat insulation layer, which is sandwiched between the TPU substrate layer and the PET substrate layer, and / or is arranged on the second surface of the composite substrate layer.

[0010] A preferred technical solution is that the composite substrate layer is a stacked structure of TPU substrate layer / PET substrate layer, or TPU substrate layer / PET substrate layer / PET substrate layer, or TPU substrate layer / PET substrate layer / TPU substrate layer, and adjacent substrate layers in the composite substrate layer are connected by an adhesive layer.

[0011] A preferred technical solution is that the surface of the TPU substrate layer is the second surface, the second surface is a concave-convex surface, and the protrusions of the concave-convex surface extend along the first direction and are arranged along the second direction.

[0012] A preferred technical solution is that the adhesive layer is a heat-insulating layer, and the raw material of the heat-insulating layer includes nano CTO cesium tungsten bronze powder.

[0013] A preferred technical solution is that, in the three-layer laminated structure of the composite substrate layer, one of the adhesive layers is a heat insulating layer, and another of the adhesive layers is a colored flame retardant adhesive layer.

[0014] A preferred technical solution is that the second surface of the composite substrate layer is provided with a scratch-resistant coating.

[0015] A preferred technical solution is that a heat-insulating outer layer is provided between the scratch-resistant coating and the composite substrate layer.

[0016] A preferred technical solution is that one surface of the installation adhesive layer is connected to the composite substrate layer, and the other surface is provided with a concave-convex surface, and the concave-convex surface is matched with the PET release layer in a concave-convex manner.

[0017] A preferred technical solution is that the scratch-resistant coating has a layer thickness of 2 to 5 μm, and the heat-insulating outer layer has a layer thickness of 2 to 5 μm.

[0018] The preferred technical solution is that the thickness of the adhesive layer is 6 to 10 μm, the thickness of the TPU substrate layer is 20 to 40 μm, and the thickness of the PET substrate layer is 20 to 40 μm.

[0019] The advantages and beneficial effects of the utility model are:

[0020] The bending-resistant heat-insulating window film has a reasonable structure. The PET substrate layer provides high-strength and stable support to maintain the basic shape of the window film and ensure its dimensional stability during long-term use. Combined with the setting of the TPU substrate layer, the softness and plasticity of the window film are improved, making it suitable for covering complex curved surfaces. The setting of the heat-insulating layer optimizes the heat-insulating effect of the window film. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of Embodiment 1 of the bending-resistant heat-insulating window film of the utility model;

[0022] Figure 2This is a schematic structural diagram of Embodiment 2 of the bending-resistant heat-insulating window film of the utility model;

[0023] Figure 3 It is a structural schematic diagram of Embodiment 3 of the bending-resistant heat-insulating window film of the present utility model.

[0024] In the figure: 1. composite substrate layer; 2. mounting adhesive layer; 3. thermal insulation layer; 4. scratch-resistant coating; 5. PET release layer; 10. adhesive layer; 11. TPU substrate layer; 12. PET substrate layer; 13. colored flame-retardant adhesive layer; 41. thermal insulation outer layer; 101. first surface; 102. second surface. DETAILED DESCRIPTION

[0025] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0026] The terms "surface" and "outside" are based on the normal use state of the bend-resistant heat-insulating window film and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0028] like Figures 1 to 3 As shown, the utility model discloses a bending-resistant heat-insulating window film, comprising a composite substrate layer 1, a mounting adhesive layer 2 and a heat-insulating layer 3, wherein the composite substrate layer 1 has a first surface 101 and a second surface 102 along a film thickness direction; the mounting adhesive layer 2 is arranged on the first surface 101; the composite substrate layer 1 comprises a TPU substrate layer 11 and a PET substrate layer 12, wherein the TPU substrate layer 11 is close to the second surface 102.

[0029] In some embodiments, the composite substrate layer 1 is a double-layer laminated structure of a TPU substrate layer / a PET substrate layer.

[0030] In some embodiments, the composite substrate layer 1 is a three-layer stacked structure of TPU substrate layer / PET substrate layer / PET substrate layer.

[0031] In some embodiments, the composite substrate layer 1 is a three-layer stacked structure of TPU substrate layer / PET substrate layer / TPU substrate layer.

[0032] PET (polyethylene terephthalate) has good transparency, mechanical strength and weather resistance; while TPU (thermoplastic polyurethane) has high elasticity, wear resistance, tear resistance, hydrolysis resistance and good low-temperature flexibility. The TPU substrate layer 11 improves the elasticity and recovery performance of the window film, and can enhance the impact resistance of the window film, especially for occasions that need to withstand large tensile forces or collisions. The PET substrate layer 12 provides high-strength and stable support, maintains the basic shape of the window film, and ensures its dimensional stability for long-term use. The provision of the TPU substrate layer 11 increases the softness and plasticity of the window film, making it perform well when covering complex curved surfaces. Therefore, the composite window film is more suitable for use on vehicle front and rear windshields and other irregular curved glass.

[0033] The first direction is an arbitrary direction, and the second direction is perpendicular to the first direction. The surface of the TPU substrate layer 11 is the second surface 102, and the second surface 102 is a concave-convex surface, and the protrusions (not marked) of the concave-convex surface extend along the first direction and are arranged along the second direction. That is, the cross-section of the protrusion along the first direction is serrated, and when the window film is bonded to the vehicle glass, the adjacent protrusions are close to or open through the gaps between the adjacent protrusions, and further bonded to the front and rear windshields and other irregular curved glass of the vehicle, and at the same time, the window film is stretched when bent, eliminating microscopic wrinkles when the window film is bent.

[0034] Adjacent substrate layers in the composite substrate layer 1 are connected by an adhesive layer 10. The main material of the adhesive layer is acrylic adhesive. Acrylic adhesive has extremely high initial adhesion and long-lasting retention, excellent aging resistance, and can resist the influence of ultraviolet radiation, humidity changes, and extreme temperatures. It can also maintain good bonding performance outdoors and in harsh environmental conditions; it has good resistance to many chemicals, including acid and alkali resistance, oil resistance, solvent resistance, etc., and therefore exhibits excellent durability in a variety of industrial applications; it can be used in a wide temperature range, such as -30°C to 150°C, and can still maintain stable bonding performance and physical properties within this range, so it is suitable for outdoor applications in high or low temperature environments and is not prone to delamination.

[0035] In some embodiments, the heat insulating layer 3 is sandwiched between the TPU substrate layer 11 and the PET substrate layer 12. In order to improve the stability and sustainability of the heat insulating performance, further, the adhesive layer 10 is a heat insulating layer, and the raw material of the heat insulating layer 3 includes nano CTO cesium tungsten bronze powder.

[0036] Among them, cesium tungsten bronze nanopowder, as an important nanomaterial, is widely used in the field of transparent thermal insulation coatings; cesium tungsten bronze nanoparticles have high absorption performance for infrared light, while maintaining a high visible light transmittance, which makes it a key component of transparent thermal insulation coatings, which can effectively block the heat energy in solar radiation from entering the room, reduce the air-conditioning load, and improve the energy-saving efficiency of vehicles; the material has good high-temperature stability and oxidation resistance, and is suitable for the insulation needs under long-term outdoor use conditions; and compared with some heavy metal elements, cesium tungsten bronze has certain advantages in environmental protection, reducing the possible adverse effects on the environment and human body.

[0037] In some embodiments, one adhesive layer 10 of the three-layer laminated structure of the composite substrate layer 1 is a heat insulation layer, and the other adhesive layer is a colored flame retardant adhesive layer 13. The raw materials of the colored flame retardant adhesive layer 13 include acrylic acid, inorganic high-definition dye solution and flame retardant, and the flame retardant is an organic flame retardant, such as phosphorus flame retardant and nitrogen flame retardant. The window film is made into a colored window film, which is suitable for different application scenarios of the vehicle and also effectively prevents the problem of masterbatch precipitation.

[0038] like Figure 1 As shown, in some embodiments, the second surface 102 of the composite substrate layer 1 is provided with a scratch-resistant coating 4, which is compounded with the TPU substrate layer 11 to further improve the wear resistance. The raw materials of the scratch-resistant coating include ethyl ester solvent, toluene solvent, hardening liquid and curing agent.

[0039] like Figure 3 As shown, in some embodiments, the heat insulation layer 3 is disposed on the second surface 102 of the composite substrate layer 1. Further, a heat insulation outer layer 41 is disposed between the scratch-resistant coating 4 and the composite substrate layer 1. That is, the heat insulation outer layer 41 is the heat insulation layer 3, and the raw material liquid of the heat insulation outer layer 41 includes nano CTO cesium tungsten bronze powder.

[0040] like Figure 2 As shown, in some embodiments, the thermal insulation layer 3 is sandwiched between the TPU substrate layer 11 and the PET substrate layer 12 , and is also disposed on the second surface 102 of the composite substrate layer 1 .

[0041] In order to improve the pasting efficiency of the installation adhesive layer, the installation adhesive layer has a venting effect to effectively prevent the appearance of bubbles during the film pasting process, which reduces the appearance and performance of the window film. One surface of the installation adhesive layer 2 is connected to the composite substrate layer 1, and the other surface is provided with a concave-convex surface, which is matched with the PET release layer 5 in a concave-convex manner.

[0042] The thickness of the scratch-resistant coating 4 is 2-5 μm, the thickness of the heat-insulating outer layer 41 is 2-5 μm, the thickness of the adhesive layer 10 is 6-10 μm, the thickness of the TPU substrate layer 11 is 20-40 μm, and the thickness of the PET substrate layer 12 is 20-40 μm.

[0043] Example 1

[0044] like Figure 1 As shown, the bending-resistant heat-insulating window film includes a composite substrate layer 1, an installation adhesive layer 2 and a heat-insulating layer 3. The composite substrate layer 1 has a first surface 101 and a second surface 102 along the film thickness direction; the installation adhesive layer 2 is arranged on the first surface 101; the composite substrate layer 1 is a double-layer stacked structure of a TPU substrate layer / PET substrate layer, wherein the TPU substrate layer 11 is close to the second surface 102, the surface of the TPU substrate layer 11 is the second surface 102, the second surface 102 is a concave-convex surface, and the convexities of the concave-convex surface extend along the first direction and are arranged along the second direction. The second surface 102 of the composite substrate layer 1 is provided with a scratch-resistant coating 4, and the adjacent substrate layers in the composite substrate layer 1 are connected by an adhesive layer 10, and the adhesive layer 10 is a heat-insulating layer 3, and the raw material of the heat-insulating layer 3 includes nano CTO cesium tungsten bronze powder.

[0045] Example 2

[0046] like Figure 2 As shown, Example 2 is based on Example 1, except that the composite substrate layer 1 is a three-layer laminated structure of TPU substrate layer / PET substrate layer / PET substrate layer. One adhesive layer 10 of the three-layer laminated structure of the composite substrate layer 1 is a heat insulation layer 2, and the other adhesive layer 10 is a colored flame retardant adhesive layer 13. A heat insulation outer layer 41 is also provided between the scratch-resistant coating 4 and the composite substrate layer 1.

[0047] Example 3

[0048] like Figure 3 As shown, Example 3 is based on Example 1, except that the composite substrate layer 1 is a three-layer laminated structure of TPU substrate layer / PET substrate layer / TPU substrate layer. In the three-layer laminated structure of the composite substrate layer 1, one adhesive layer 10 is a heat insulation layer 3, and the other adhesive layer 10 is a colored flame retardant adhesive layer 13.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A bending-resistant heat-insulating window film, comprising: A composite substrate layer having a first surface and a second surface along a film thickness direction; An installation adhesive layer is disposed on the first surface; It is characterized in that The composite substrate layer includes a TPU substrate layer and a PET substrate layer, wherein the TPU substrate layer is close to the second surface; and further includes a heat insulation layer, which is sandwiched between the TPU substrate layer and the PET substrate layer, and / or is arranged on the second surface of the composite substrate layer.

2. The bending-resistant heat-insulating window film according to claim 1, characterized in that: The composite substrate layer is a stacked structure of TPU substrate layer / PET substrate layer, or TPU substrate layer / PET substrate layer / PET substrate layer, or TPU substrate layer / PET substrate layer / TPU substrate layer, and adjacent substrate layers in the composite substrate layer are connected by an adhesive layer.

3. The bending-resistant heat-insulating window film according to claim 1 or 2, characterized in that: The surface of the TPU substrate layer is a second surface, and the second surface is a concave-convex surface. The protrusions of the concave-convex surface extend along the first direction and are arranged along the second direction.

4. The bending-resistant heat-insulating window film according to claim 2, characterized in that: The adhesive layer is a heat-insulating layer, and the raw material of the heat-insulating layer includes nano CTO cesium tungsten bronze powder.

5. The bending-resistant heat-insulating window film according to claim 2, characterized in that: In the three-layer laminated structure of the composite substrate layer, one of the adhesive layers is a heat insulation layer, and the other adhesive layer is a colored flame-retardant adhesive layer.

6. The bending-resistant heat-insulating window film according to claim 3, characterized in that: The second surface of the composite substrate layer is provided with a scratch-resistant coating.

7. The bending-resistant heat-insulating window film according to claim 6, characterized in that: A heat-insulating outer layer is arranged between the scratch-resistant coating and the composite substrate layer.

8. The bending-resistant heat-insulating window film according to claim 1, characterized in that: One surface of the installation adhesive layer is connected to the composite substrate layer, and the other surface is provided with a concave-convex surface, and the concave-convex surface is matched with the PET release layer.

9. The bending-resistant heat-insulating window film according to claim 7, characterized in that: The layer thickness of the scratch-resistant coating is 2 to 5 μm, and the layer thickness of the heat-insulating outer layer is 2 to 5 μm.

10. The bending-resistant heat-insulating window film according to claim 2, characterized in that: The thickness of the adhesive layer is 6-10 μm, the thickness of the TPU substrate layer is 20-40 μm, and the thickness of the PET substrate layer is 20-40 μm.

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