TPU (Thermoplastic Polyurethane) color-changing car cover film structure with optical colorful effect

Abstract

The utility model discloses a TPU (thermoplastic polyurethane) color-changing car cover film structure with an optical colorful effect, which relates to the technical field of car cover film structures and comprises a base film layer, a first pressure-sensitive adhesive layer arranged at the top of the base film layer, an impact absorbing layer arranged at the top of the first pressure-sensitive adhesive layer and a self-repairing layer arranged at the top of the impact absorbing layer. A first release layer is arranged at the top of the self-repairing layer; an optically variable glue layer is arranged at the bottom of the base film layer, a TPU black / white film layer is arranged at the bottom of the optically variable glue layer, a second pressure-sensitive adhesive layer is arranged at the bottom of the TPU black / white film layer, and a second release layer is arranged at the bottom of the second pressure-sensitive adhesive layer; by adding the impact absorption layer, the impact resistance and energy absorption effects under the action of external force are achieved, the probability of damage to the deep structure in the automobile cover film is reduced, the damage degree of the external force to the whole automobile cover film is reduced, the situation that the automobile cover film exceeds the repair limit of the self-repair layer is avoided, and the automobile cover can be well self-repaired.

Description

Technical Field

[0001] The utility model relates to the technical field of car cover film structures, and in particular to a TPU color-changing car cover film structure with an optical colorful effect. Background Art

[0002] Traditional car wrap films are mainly divided into two categories: the first is invisible car wrap film, which is known for its unique self-healing ability, but most films are transparent and cannot change the exterior color of the car; the second is color-changing car wrap film, which is characterized by its rich and colorful film colors. However, this type of film is often limited to a single color or lacks self-healing function, and has not yet touched the cutting-edge technology of optical color change, making it difficult to meet the young consumer group's ultimate pursuit of a vehicle appearance that is both personalized and futuristic.

[0003] In view of this, the patent (CN215250556U) discloses a color-changing self-repairing car cover film with an optically dazzling effect. By adding inorganic optical color-changing pigments to the light-changing glue layer, the car cover film can present optically changing colors under sunlight at different angles, meeting the user's personalized needs.

[0004] However, in actual automotive applications, technical engineers found that although this color-changing self-repairing car film with optical dazzling effect has a good optical dazzling effect, there is still room for further optimization in self-repairing performance. Through further optimization, the self-repairing performance of the car film can be further improved. Utility Model Content

[0005] The purpose of the utility model is to provide a TPU color-changing car cover film structure with an optically dazzling effect, and to further optimize the self-repairing performance of the TPU color-changing car cover film with an optically dazzling effect by adding an impact-absorbing layer.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A TPU color-changing car cover film structure with an optically dazzling effect, comprising a base film layer, a first pressure-sensitive adhesive layer, an impact-absorbing layer, a self-repairing layer, a first release layer, a light-changing glue layer, a TPU black / white film layer, a second pressure-sensitive adhesive layer, and a second release layer;

[0008] A first pressure-sensitive adhesive layer is provided on the top of the base film layer, an impact-absorbing layer is provided on the top of the first pressure-sensitive adhesive layer, a self-repairing layer is provided on the top of the impact-absorbing layer, and a first release layer is provided on the top of the self-repairing layer;

[0009] A light-variable glue layer is provided at the bottom of the base film layer, a TPU black / white film layer is provided at the bottom of the light-variable glue layer, a pressure-sensitive adhesive layer is provided at the bottom of the TPU black / white film layer, and a second release layer is provided at the bottom of the second pressure-sensitive adhesive layer.

[0010] As a further solution of the present invention: the base film layer is a transparent TPU film with a thickness of 100-200 microns.

[0011] As a further solution of the present invention: the impact absorbing layer is a polycaprolactone TPU film with a thickness of 50-100 microns.

[0012] As a further solution of the present invention: the self-repairing layer is a two-component polyurethane acrylic resin with a self-repairing function, and has a thickness of 10-30 microns.

[0013] As a further solution of the present invention: the first release layer is a UV light-cured release film layer with a thickness of 30-50 microns.

[0014] As a further solution of the present invention: the optically variable glue layer is an optically variable composite glue mixed with optical color-changing pigment and polyurethane bonding glue, and the thickness of the optically variable glue layer is 5-30 microns.

[0015] As a further solution of the present invention: the optical color-changing pigment is an inorganic optical color-changing pigment made from mica ore through vacuum evaporation and other processes, and the optical color-changing composite glue is prepared by mixing the optical color-changing pigment with polyurethane bonding glue.

[0016] As a further solution of the present invention: the TPU black / white film layer is a black or white TPU film with a thickness of 100-200 microns.

[0017] As a further solution of the present invention: the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer are both acrylic pressure-sensitive adhesives, the thickness of the first pressure-sensitive adhesive layer is 10-15 microns, and the thickness of the second pressure-sensitive adhesive layer is 20-40 microns.

[0018] As a further solution of the present invention: the second release layer adopts a silicone oil release film.

[0019] Beneficial effects of the utility model:

[0020] The utility model adds a polycaprolactone TPU film between the self-repairing layer and the base film layer, and utilizes the high elasticity, wear resistance and scratch resistance of polycaprolactone TPU to form a film, thereby achieving impact resistance and energy absorption when external force acts; when external force scratches the car cover, the impact force is absorbed by the impact absorption layer, reducing the probability of damaging the deep internal structure of the car cover film, reducing the degree of damage to the overall car cover film by external force, avoiding exceeding the repair limit of the self-repairing layer, and allowing the car cover to better repair itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the structure of the car cover film of the present utility model.

[0023] In the figure: 1. Base film layer; 2. First pressure-sensitive adhesive layer; 3. Impact absorption layer; 4. Self-repairing layer; 5. First release layer; 6. Photovariable glue layer; 7. TPU black / white film layer; 8. Second pressure-sensitive adhesive layer; 9. Second release layer. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, a TPU color-changing car cover film structure with an optically dazzling effect includes a base film layer 1, a first pressure-sensitive adhesive layer 2, an impact-absorbing layer 3, a self-repairing layer 4, a first release layer 5, a light-changing glue layer 6, a TPU black / white film layer 7, a second pressure-sensitive adhesive layer 8, and a second release layer 9;

[0026] The base film layer 1 is a transparent TPU film, a first pressure-sensitive adhesive layer 2 is provided on the top of the base film layer 1, a shock-absorbing layer 3 is provided on the top of the first pressure-sensitive adhesive layer 2, a self-repairing layer 4 is provided on the top of the shock-absorbing layer 3, and a first release layer 5 is provided on the top of the self-repairing layer 4;

[0027] A photochromic glue layer 6 is provided at the bottom of the base film layer 1, a TPU black / white film layer 7 is provided at the bottom of the photochromic glue layer 6, a second pressure-sensitive adhesive layer 8 is provided at the bottom of the TPU black / white film layer 7, and a second release layer 9 is provided at the bottom of the second pressure-sensitive adhesive layer 8. A composite multi-layer structure is extended from the base film layer 1 to the upper and lower sides to constitute the overall TPU color-changing car cover film structure.

[0028] The above-mentioned base film layer 1 is a transparent TPU film with a thickness of 100-200 microns. Through the stretching and rebound properties of the TPU film, the light-changing color inside the car cover film can be revealed through the transparent TPU film, showing an optical dazzling effect.

[0029] The above-mentioned impact-absorbing layer 3 is a polycaprolactone TPU film, wherein the polycaprolactone TPU film is prepared from polycaprolactone TPU, the molecular weight of the polycaprolactone TPU is greater than 100,000, the melting point is 120-140°C, and the thickness of the polycaprolactone TPU film is 50-100 microns; the film is formed by utilizing the high elasticity and wear-resistant and scratch-resistant properties of polycaprolactone TPU to achieve impact-resistant energy absorption when external force acts; when external force scratches the car cover, the impact force is absorbed by the impact-absorbing layer 3, reducing the probability of damaging the deep internal structure of the car cover film, reducing the degree of damage to the overall car cover film caused by external force, avoiding exceeding the repair limit of the self-repair layer 4, and allowing the car cover to better self-repair.

[0030] The above-mentioned self-repairing layer 4 is a two-component polyurethane acrylic resin with self-repairing function. The dry film thickness of the self-repairing layer is 10-30 microns. The self-repairing layer preferably adopts the TM-1106 series thermal repair resin of Bangkexue. The self-repairing layer 4 is used to realize the thermal self-repairing ability of the car cover film when the surface is slightly scratched.

[0031] The above-mentioned first release layer 5 is an existing UV light-curing release film layer, and the UV light-curing release agent coated thereon is preferably a UV-3300 series product of Bangkexue with a thickness of 30-50 microns; by coating the UV light-curing release agent in the first release layer 5, the surface of the car cover self-repair layer 4 can be made smoother, without shrinkage holes, and with high brightness.

[0032] The above-mentioned photochromic glue layer 6 is a photochromic composite glue mixed with optical color-changing pigments and polyurethane bonding glue. The thickness of the photochromic glue layer 6 is 5-30 microns. The polyurethane bonding glue preferably adopts Bangchengxue UC-3134 or UC-3234 series polyurethane glue, wherein the optical color-changing pigment is an inorganic optical color-changing pigment made of mica ore through vacuum evaporation and other processes. The photochromic composite glue mixed with optical color-changing pigments and polyurethane bonding glue can achieve the effect of the car cover film presenting different colors and glosses under different light angles, thereby achieving an optical colorful effect.

[0033] Furthermore, the above-mentioned TPU black / white film layer 7 is a black or white TPU film with a thickness of 100-200 microns. Through the black or white TPU film, the optical color effect of the car cover film is more obvious and the amount of optical color-changing pigment added is reduced.

[0034] Furthermore, the first pressure-sensitive adhesive layer 2 and the second pressure-sensitive adhesive layer 8 are both acrylic pressure-sensitive adhesives. The dry adhesive thickness of the pressure-sensitive adhesive of the first pressure-sensitive adhesive layer 2 is 10-15 microns, and the dry adhesive thickness of the pressure-sensitive adhesive of the second pressure-sensitive adhesive layer 8 is 20-40 microns. The PSA-3600 series acrylic pressure-sensitive adhesive of Bangcuring is used to achieve effective bonding and protection between the polycaprolactone TPU film and the base film layer 1, as well as the car cover film and the car paint surface.

[0035] The second release layer 9 is a silicone release film. The second release layer 9 protects the pressure-sensitive adhesive from adhering to other layers of the car cover film during storage or transportation after winding, making it easier to wind the car cover film.

[0036] The specific operation method of this utility model is as follows:

[0037] Pressure-sensitive adhesive is applied on one side of the polycaprolactone TPU film by scraper method. After applying the glue, it is dried to solidify the glue and enhance the bonding strength with the polycaprolactone TPU film. Self-repairing coating is applied on the other side of the polycaprolactone TPU film. After drying, it is attached with UV light-curing release film. Then, light-variable composite glue is applied on one side of the TPU film. After drying, TPU black / white film is attached. Pressure-sensitive adhesive is applied on the other side of the TPU black / white film by scraper method. It is dried and then attached with silicone oil release film. Then, the polycaprolactone TPU film coated with glue is laminated with the TPU film to ensure that the two are aligned and tightly fitted to avoid bubbles and wrinkles. The laminated car cover film is placed in a curing room and cured at a set temperature (such as 55 degrees Celsius) for 24-48 hours to fully bond the glue and raw materials together and make the performance more stable.

[0038] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A TPU color-changing car cover film structure with an optically dazzling effect, characterized in that: It comprises a base film layer (1), a first pressure-sensitive adhesive layer (2), an impact absorbing layer (3), a self-repairing layer (4), a first release layer (5), a light-variable adhesive layer (6), a TPU black / white film layer (7), a second pressure-sensitive adhesive layer (8) and a second release layer (9); A first pressure-sensitive adhesive layer (2) is provided on the top of the base film layer (1), an impact-absorbing layer (3) is provided on the top of the first pressure-sensitive adhesive layer (2), a self-repairing layer (4) is provided on the top of the impact-absorbing layer (3), and a first release layer (5) is provided on the top of the self-repairing layer (4); A light-variable glue layer (6) is provided at the bottom of the base film layer (1), a TPU black / white film layer (7) is provided at the bottom of the light-variable glue layer (6), a second pressure-sensitive adhesive layer (8) is provided at the bottom of the TPU black / white film layer (7), and a second release layer (9) is provided at the bottom of the pressure-sensitive adhesive layer (8).

2. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The base film layer (1) is a transparent TPU film with a thickness of 100-200 microns.

3. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The impact absorbing layer (3) is a polycaprolactone TPU film with a thickness of 50-100 microns.

4. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The self-repairing layer (4) is a two-component polyurethane acrylic resin with a self-repairing function and has a thickness of 10-30 microns.

5. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The first release layer (5) is a UV light-cured release film layer with a thickness of 30-50 microns.

6. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The optically variable glue layer (6) is an optically variable composite glue mixed with an optically variable pigment and a polyurethane bonding glue, and the thickness of the optically variable glue layer (6) is 5-30 microns.

7. The TPU color-changing car cover film structure with optical colorful effect according to claim 6, characterized in that: Optical color-changing pigments are inorganic optical color-changing pigments made from mica ore through vacuum evaporation and other processes. Optical color-changing composite glue is made by mixing optical color-changing pigments with polyurethane bonding glue.

8. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The TPU black / white film layer (7) is a black or white TPU film with a thickness of 100-200 microns.

9. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The first pressure-sensitive adhesive layer (2) and the second pressure-sensitive adhesive layer (8) are both acrylic pressure-sensitive adhesives. The thickness of the first pressure-sensitive adhesive layer (2) is 10-15 microns, and the thickness of the second pressure-sensitive adhesive layer (8) is 20-40 microns.

10. The TPU color-changing car cover film structure with optical colorful effect according to claim 1, characterized in that: The second release layer (9) is a silicone oil release film.

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