Self-repairing vehicle body protective film

Abstract

The utility model discloses a self-repairing vehicle body protective film, which comprises a base material composite layer, a first surface, a second surface and a protective layer, the mounting adhesive layer is arranged on the first surface; the repairing coating is arranged on the second surface; the mounting adhesive layer comprises a high-viscosity layer and a repairing adhesive layer, and the repairing adhesive layer is close to the base material composite layer and is overlapped with the high-viscosity layer along the layer thickness; or the repairing adhesive layer is in concave-convex fit with the high-viscosity layer, and the convex surface of the repairing adhesive layer and the outer surface of the high-viscosity layer are on the same plane. The self-repairing vehicle body protective film is reasonable in structure, the bonding firmness of the protective film is ensured and the repairability of the adhesive layer is realized through the mounting adhesive layer formed by stacking the repairing adhesive layer and the high-viscosity layer, the protective film can be repaired under the combined action of the repairing coating, and the service life of the protective film is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of protective film, especially to a self-repairing car body protective film. BACKGROUND

[0002] The car body protective film surface generally has a repair coating, when the car body is scratched or slightly collided, as long as the car body protective film itself is not damaged, the small scratches can be automatically eliminated in a short time. Therefore, the repair coating is used for the car body protective film, which plays a good protective role for the car paint and can prevent the car paint from being scratched. However, when the film is pasted, the adhesive layer of the car body protective film is punctured by sharp objects or the repair coating, so that the adhesive layer cannot be repaired, and the car body is not well pasted or the waterproof performance is reduced.

[0003] Therefore, it is necessary to improve the car body protective film in the prior art. UTILITY MODEL CONTENT

[0004] The utility model discloses a self-repairing car body protective film, which overcomes the defects in the prior art, guarantees the adhesion firmness of the protective film and realizes the repairability of the adhesive layer, repairs the protective film by combining the repair coating, and prolongs the service life.

[0005] To achieve the above technical effects, the technical scheme of the utility model is as follows: a self-repairing car body protective film comprises:

[0006] A base material composite layer has a first surface and a second surface opposite along the layer thickness direction.

[0007] An installation adhesive layer is arranged on the first surface.

[0008] A repair coating is arranged on the second surface.

[0009] The installation adhesive layer comprises a high-adhesion layer and a repair adhesive layer, the repair adhesive layer is close to the base material composite layer and is arranged opposite to the high-adhesion layer along the layer thickness; or the repair adhesive layer is in concave-convex cooperation with the high-adhesion layer, and the convex surface of the repair adhesive layer is in the same plane as the outer surface of the high-adhesion layer.

[0010] In the preferred technical scheme, the repair coating comprises a first repair layer and a second repair layer, the second repair layer is close to the base material composite layer, the material of the first repair layer and the second repair layer is polyurethane, the first repair layer is an ultraviolet-resistant layer, and the second repair layer comprises self-repairing microcapsules.

[0011] In the preferred technical scheme, the self-repairing microcapsule comprises a core and a sealed shell surrounding the core, the material of the core is isocyanate, and the material of the sealed shell is polyurethane.

[0012] A preferred technical solution is that the first repair layer contains one of an ultraviolet absorber, a light stabilizer and an antioxidant.

[0013] A preferred technical solution is that the material of the high-adhesion layer is acrylic adhesive, and the material of the repair adhesive layer is self-repairing polyurethane pressure-sensitive adhesive.

[0014] The preferred technical solution is that the substrate composite layer is a TPU layer, or a TPU layer / PET layer / TPU layer, or a TPU layer / TPU layer / TPU layer, or a TPU layer / PU layer / TPU layer, or a TPU layer / PVC layer / TPU layer stacked structure.

[0015] A preferred technical solution is that a heat reflective layer is provided between the repair coating and the substrate composite layer, or between the substrate composite layer and the mounting adhesive layer, and the heat reflective layer is one of an aluminum oxide reflective layer, a titanium dioxide reflective layer, a zinc oxide reflective layer and a tin oxide reflective layer.

[0016] A preferred technical solution is that an antistatic release film is provided on the surface of the installation adhesive layer away from the substrate composite layer, and an outer protective layer is provided on the surface of the repair coating layer away from the substrate composite layer.

[0017] A preferred technical solution is that the thickness of the substrate composite layer is 100-400 μm, the thickness of the mounting adhesive layer is 20-50 μm, and the thickness of the repair coating is 15-25 μm.

[0018] The advantages and beneficial effects of the utility model are:

[0019] The self-repairing car body protective film has a reasonable structure. The installation adhesive layer is composed of a repair adhesive layer and a high-viscosity layer, which ensures the adhesion strength of the protective film and realizes the repairability of the adhesive layer, effectively preventing the adhesive layer from being scratched by sharp objects, resulting in poor adhesion of the protective film and even the scrapping of the protective film; when the repair coating pierces the adhesive layer, it can work together with the repair coating to repair the protective film, thereby increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of Example 1 of the self-repairing vehicle body protective film of the present invention;

[0021] Figure 2 This is a structural diagram of Example 2 of the self-repairing vehicle body protective film of the present invention;

[0022] Figure 3 This is a schematic structural diagram of Example 3 of the self-repairing vehicle body protective film of the present invention.

[0023] In the figure: 1. Base material composite layer; 2. Installation adhesive layer; 3. Installation adhesive layer; 4. Surface protective layer; 5. Antistatic release film; 13. Heat reflective layer; 21. Repair adhesive layer; 22. High adhesion layer; 31. First repair layer; 32. Second repair layer; 40. Brightening hardening coating. DETAILED DESCRIPTION

[0024] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] The “surface” is based on the normal use state of the self-repairing vehicle body protective film and is only for the convenience of describing the present invention and simplifying the description. It does 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, it cannot be understood as a limitation on the present invention.

[0026] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0027] like Figures 1-3 As shown, the self-repairing vehicle body protective film disclosed in the present invention comprises a substrate composite layer 1, an installation adhesive layer 2, a repair coating 3, an antistatic release film 5, and an exterior protective layer 4. The substrate composite layer 1 has a first surface (not labeled) and a second surface (not labeled) that are opposite each other along the thickness direction. The installation adhesive layer 2 is disposed on the first surface, the repair coating 3 is disposed on the second surface, the antistatic release film 5 is disposed on the surface of the installation adhesive layer 2 distal from the substrate composite layer 1, and the exterior protective layer 4 is disposed on the surface of the repair coating 3 distal from the substrate composite layer 1. The exterior protective layer 4 is a brightening protective film. A brightening hardening coating 40 is applied to the surface of the PET material exterior protective layer 4 to enhance the film's gloss and puncture resistance. The installation adhesive layer 2 comprises a high-viscosity layer 22 and a repair adhesive layer 21, with the repair adhesive layer 21 being adjacent to the substrate composite layer 1.

[0028] like Figure 1 As shown, in some embodiments, the repair adhesive layer 21 and the high-viscosity layer 22 are stacked along the layer thickness.

[0029] like Figure 2 As shown, in some embodiments, the repair adhesive layer 21 and the high-viscosity layer 22 are matched with each other in a concave-convex manner, and the convex surface of the repair adhesive layer 21 and the outer surface of the high-viscosity layer 22 are in the same plane.

[0030] By stacking the repair adhesive layer 21 and the high-viscosity layer 22 to form the installation adhesive layer 2, the adhesion strength of the protective film is guaranteed and the repairability of the adhesive layer is achieved, which effectively prevents the adhesive layer from being scratched by sharp objects, resulting in poor adhesion of the protective film or even the scrapping of the protective film; when the repair coating 3 pierces the adhesive layer, it can work together with the repair coating 3 to repair the protective film and increase its service life.

[0031] The repair coating 3 includes a first repair layer 31 and a second repair layer 32. The second repair layer 32 is adjacent to the substrate composite layer 1. Both the first repair layer 31 and the second repair layer 32 are made of polyurethane. The first repair layer 31 is an anti-ultraviolet layer, and the second repair layer 32 includes self-repairing microcapsules (not shown). The self-repairing microcapsules include a core and a sealed shell surrounding the core. The core is made of isocyanate, and the sealed shell is made of polyurethane. The material selection of the self-repairing microcapsules improves their compatibility and uniformity of distribution in the raw materials of the second repair layer 32, thereby improving the self-repair effect of the protective film. The first repair layer 31 has anti-ultraviolet properties, which not only improves the aging resistance of the protective film but also prevents ultraviolet rays from negatively affecting the stability of the self-repairing microcapsules. The provision of the sealed shell improves the stability of the self-repairing microcapsules before puncture, and in the event of an accidental scratch, the cross-linking reaction of the core material is promptly ruptured to play a repair role.

[0032] In order to enhance the UV resistance of the polyurethane repair coating, the first repair layer 31 further contains one of a UV absorber, a light stabilizer, and an antioxidant. Ultraviolet absorber (UVA): This type of additive can absorb ultraviolet rays and convert them into heat energy, thereby reducing the damage of ultraviolet rays to the coating. Commonly used UVAs include benzophenones, salicylates, etc. Additives such as light stabilizers (HALS, Hindered Amine Light Stabilizers) inhibit photooxidation reactions by capturing free radicals, thereby extending the service life of the material. They work synergistically with UV absorbers to significantly improve the weather resistance of the material. Although antioxidants mainly target oxidation reactions, they can also indirectly help resist degradation processes caused by ultraviolet rays.

[0033] The high-adhesion layer 22 is made of acrylic adhesive, while the repair adhesive layer 21 is made of self-healing polyurethane pressure-sensitive adhesive. Due to its high transparency and excellent weather resistance, acrylic adhesive is often used in protective films that require long-term color retention and glossiness. This helps ensure a beautiful appearance and lasting discoloration after application. Self-healing polyurethane pressure-sensitive adhesive automatically restores surface smoothness when scratched or damaged, further improving the toughness and tensile strength of the protective film.

[0034] The substrate composite layer 1 comprises a laminated structure of a TPU layer, or a TPU layer / PET layer / TPU layer, or a TPU layer / TPU layer / TPU layer, or a TPU layer / PU layer / TPU layer, or a TPU layer / PVC layer / TPU layer. The composite structure of PET and TPU increases surface hardness and scratch resistance, significantly improving overall protective performance. The combination of TPU's softness and PET's stability makes the vehicle body protective film easier to install and better conforms to the curves of the vehicle body. The combined hardness of the TPU layer and the PVC layer helps maintain the film's flatness, reduces wrinkles and bubbles, and improves the film's flame retardancy. The composite structure of the TPU and PU layers provides excellent protection, resisting both minor scratches and more serious damage.

[0035] To improve the thermal insulation performance of the protective film, a heat reflective layer 13 is provided between the repair coating 3 and the substrate composite layer 1, or between the substrate composite layer 1 and the mounting adhesive layer 2. Heat reflective layer 13 can be selected from a variety of materials, including aluminum oxide, titanium dioxide, zinc oxide, and tin oxide. Titanium dioxide (TiO2) has a high refractive index and effectively reflects visible and near-infrared light, while also being relatively low-cost. Zinc oxide (ZnO) is transparent in the ultraviolet and visible regions, exhibits good reflectivity in the near-infrared region, and possesses antibacterial and self-cleaning properties. Aluminum oxide (Al2O3) has high thermal stability, improving the material's wear and corrosion resistance. α-Al2O3 has a high refractive index and a dense crystal structure, enhancing infrared reflection. Tin oxide (SnO2) selectively reflects infrared radiation while maintaining visible light transmittance, resulting in excellent transparency.

[0036] The thickness of the substrate composite layer 1 is 100-400 μm, the thickness of the mounting adhesive layer 2 is 20-50 μm, and the thickness of the repair coating 3 is 15-25 μm.

[0037] Example 1

[0038] like Figure 1 As shown, the self-repairing vehicle body protective film comprises a substrate composite layer 1, an installation adhesive layer 2, a repair coating 3, an antistatic release film 5, and an exterior protective layer 4. The substrate composite layer 1 has a first surface (not labeled) and a second surface (not labeled) that oppose each other along the thickness of the layer. The installation adhesive layer 2 is disposed on the first surface, the repair coating 3 is disposed on the second surface, the antistatic release film 5 is disposed on the surface of the installation adhesive layer 2 distal from the substrate composite layer 1, and the exterior protective layer 4 is disposed on the surface of the repair coating 3 distal from the substrate composite layer 1. The exterior protective layer 4 is a brightening protective film. A brightening hardening coating 40 is applied to the surface of the PET material exterior protective layer 4 to enhance the film's gloss and puncture resistance. The installation adhesive layer 2 comprises a high-viscosity layer 22 and a repair adhesive layer 21. The repair adhesive layer 21 is adjacent to the substrate composite layer 1 and overlaps the high-viscosity layer 22 along the thickness of the layer.

[0039] The substrate composite layer 1 is a laminated structure of TPU / PVC / TPU layers. The repair coating 3 includes a first repair layer 31 and a second repair layer 32, with the second repair layer 32 positioned adjacent to the substrate composite layer 1. Both the first and second repair layers 31, 32 are made of polyurethane. The first repair layer 31 is a UV-resistant layer, while the second repair layer 32 includes self-repairing microcapsules (not shown).

[0040] Example 2

[0041] like Figure 2 As shown, Example 2 is based on Example 1, with the difference that the repair adhesive layer 21 and the high-viscosity layer 22 are matched with each other in a concave-convex manner, and the convex surface of the repair adhesive layer 21 and the outer surface of the high-viscosity layer 22 are in the same plane.

[0042] Example 3

[0043] like Figure 3 As shown, Example 3 is based on Example 2, with the difference that a heat reflection layer 13 is provided between the repair coating 3 and the substrate composite layer 1 .

[0044] 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 principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A self-repairing car body protective film, comprising: A substrate composite layer having a first surface and a second surface opposite to each other in a layer thickness direction; An installation adhesive layer is provided on the first surface; a repair coating disposed on the second surface; It is characterized in that the installation adhesive layer includes a high-adhesion layer and a repair adhesive layer, the repair adhesive layer is close to the substrate composite layer, and is overlapped with the high-adhesion layer along the layer thickness; or is matched with the high-adhesion layer in a concave-convex manner, and the convex surface of the repair adhesive layer is in the same plane as the outer surface of the high-adhesion layer.

2. The self-repairing vehicle body protective film according to claim 1, characterized in that: The repair coating includes a first repair layer and a second repair layer, the second repair layer is close to the substrate composite layer, the first repair layer and the second repair layer are both made of polyurethane, and the first repair layer is an anti-ultraviolet layer.

3. The self-repairing vehicle body protective film according to claim 1, characterized in that: The material of the high-adhesion layer is acrylic adhesive, and the material of the repair adhesive layer is self-repairing polyurethane pressure-sensitive adhesive.

4. The self-repairing vehicle body protective film according to claim 1, characterized in that: The substrate composite layer is a TPU layer, or a TPU layer / PET layer / TPU layer, or a TPU layer / TPU layer / TPU layer, or a TPU layer / PU layer / TPU layer, or a TPU layer / PVC layer / TPU layer stacked structure.

5. The self-repairing vehicle body protective film according to claim 1, characterized in that: A heat reflection layer is provided between the repair coating and the substrate composite layer, or between the substrate composite layer and the installation adhesive layer. The heat reflection layer is one of an aluminum oxide reflection layer, a titanium dioxide reflection layer, a zinc oxide reflection layer and a tin oxide reflection layer.

6. The self-repairing vehicle body protective film according to claim 1, characterized in that: An antistatic release film is provided on the surface of the installation adhesive layer away from the substrate composite layer, and an outer protective layer is provided on the surface of the repair coating layer away from the substrate composite layer.

7. The self-repairing vehicle body protective film according to claim 1, characterized in that: The thickness of the substrate composite layer is 100-400 μm, the thickness of the installation adhesive layer is 20-50 μm, and the thickness of the repair coating is 15-25 μm.

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