Thermoplastic polyurethane color-changing film with sound insulation function

Abstract

The utility model discloses a thermoplastic polyurethane color-changing film with a sound insulation function, which comprises a base material composite layer containing a thermoplastic polyurethane material layer and provided with a first surface and a second surface opposite to each other along the layer thickness direction; the mounting adhesive layer is arranged on the first surface; the base material composite layer comprises a first unit base material layer, at least one surface of the first unit base material layer is provided with a concave part, at least the surface of an opening of the concave part of the first unit base material layer is covered with a second unit base material layer, the second unit base material layer is provided with a convex part matched with the concave part in a concave-convex mode, and a cavity is formed between the concave part and the convex part. A blind hole is formed in the bottom of the concave part. According to the color changing film, through the cavity formed between the concave part and the convex part and the air stored in the blind hole, the resonant frequency which is the same as the sound wave incident frequency is obtained by adjusting the volume of the cavity and the cross sectional area and depth of the blind hole, then the stored air generates resonance, incident sound energy is converted into heat energy to be eliminated, and the sound insulation effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of color-changing films, in particular to a thermoplastic polyurethane color-changing film with a sound insulation function. Background Art

[0002] Car body color change film is a special film that can be attached to the surface of a car to change the color or texture of the vehicle's appearance without having to paint it.

[0003] The molecular structure of thermoplastic polyurethane (TPU) determines its excellent physical properties, such as high elasticity, wear resistance, high strength, high hardness, easy ductility and excellent temperature adaptability; it is also non-toxic, waterproof, breathable, oil-resistant, water-resistant, mildew-resistant, and has good temperature resistance. Car body stickers based on TPU are increasingly used in the automotive industry. With the continuous development of the materials industry, the simple TPU structure is no longer sufficient to meet the functional requirements of the vast consumer market for protective films.

[0004] Therefore, it is necessary to improve the thermoplastic polyurethane color-changing 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 thermoplastic polyurethane color-changing film with sound insulation function. Through the cavity set between the recessed part and the raised part and the air stored in the blind hole, the resonance frequency same as the incident frequency of the sound wave is obtained by adjusting the volume of the cavity and the cross-sectional area and depth of the blind hole, and then the stored air resonates, converts the incident sound energy into heat energy and eliminates it, thereby achieving the sound insulation effect.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: a thermoplastic polyurethane color-changing film with sound insulation function, comprising:

[0007] A substrate composite layer comprising a thermoplastic polyurethane material layer having a first surface and a second surface opposite to each other along the thickness direction of the layer;

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

[0009] The substrate composite layer includes a first unit substrate layer, at least one surface of the first unit substrate layer is provided with a recessed portion, at least the opening surface of the recessed portion of the first unit substrate layer is covered with a second unit substrate layer, the second unit substrate layer is provided with a raised portion that matches the recessed portion, a cavity is provided between the recessed portion and the raised portion, and a blind hole is provided at the bottom of the recessed portion.

[0010] The preferred technical solution is that the substrate composite layer is a stacked structure of the second unit substrate layer / first unit substrate layer, or the second unit substrate layer / first unit substrate layer / second unit substrate layer, or the second unit substrate layer / first unit substrate layer / second unit substrate layer / first unit substrate layer, or the second unit substrate layer / first unit substrate layer / second unit substrate layer / first unit substrate layer / second unit substrate layer.

[0011] A preferred technical solution is that the material of the first unit substrate layer is polyethylene terephthalate, and the material of the second unit substrate layer is thermoplastic polyurethane.

[0012] A preferred technical solution is that a repair coating is provided on the second surface of the substrate composite layer.

[0013] A preferred technical solution is that the second unit substrate layer is connected to the first unit substrate layer via a connecting adhesive layer, and at least one of the connecting adhesive layer, the first unit substrate layer and the second unit substrate layer is a color-changing layer.

[0014] A preferred technical solution is that recessed portions are provided on both surfaces of the first unit substrate layer, recessed portions that are opposite to each other along the layer thickness direction are staggered, and adjacent recessed portions on the same plane are spaced apart.

[0015] A preferred technical solution is that an anti-ultraviolet coating is provided between the repair coating and the substrate composite layer, or one of the first unit substrate layer and the second unit substrate layer is an anti-ultraviolet layer close to the repair coating.

[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 a protective film is provided on the surface of the repair coating layer away from the substrate composite layer.

[0017] A preferred technical solution is that the installation adhesive layer is an acrylic adhesive layer; and the connection adhesive layer is a polyurethane adhesive layer or an acrylic adhesive layer.

[0018] The preferred technical solution is that the thickness of the repair coating is 8-10 μm, the thickness of the substrate composite layer is 120-180 μm, and the thickness of the mounting adhesive layer is 25-30 μm.

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

[0020] The thermoplastic polyurethane color-changing film with sound insulation function has a reasonable structure. The cavity set between the recessed part and the raised part and the air stored in the blind hole are regarded as a spring-damping system. The cavity volume and the cross-sectional area and depth of the blind hole are adjusted to obtain a resonance frequency that is the same as the incident frequency of the sound wave. Then, the cavity and the air in the blind hole resonate, converting the incident sound energy into heat energy and eliminating it, thereby achieving the sound insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the first scheme of the thermoplastic polyurethane color-changing film with sound insulation function of the utility model;

[0022] Figure 2 This is a schematic structural diagram of the second scheme of the thermoplastic polyurethane color-changing film with sound insulation function of the utility model;

[0023] Figure 3 This is a structural schematic diagram of the third scheme of the thermoplastic polyurethane color-changing film with sound insulation function of the present invention.

[0024] In the figure: 1. Base material composite layer; 2. Mounting adhesive layer; 3. Repair coating; 4. Protective film; 5. Antistatic release film; 10. Recessed portion; 11. First unit base material layer; 12. Second unit base material layer; 112. Connecting adhesive layer; 110. Blind hole; 120. Raised portion. DETAILED DESCRIPTION

[0025] 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.

[0026] The “surface” is based on the normal use state of the thermoplastic polyurethane color-changing film with sound insulation function. It 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 operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] 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.

[0028] like Figures 1-3 As shown, the thermoplastic polyurethane color-changing film with sound insulation function disclosed in the utility model includes a substrate composite layer 1, an installation adhesive layer 2, a repair coating 3, a protective film 4 and an antistatic release film 5. The substrate composite layer 1 contains a thermoplastic polyurethane material layer, and has a first surface (unmarked) and a second surface (unmarked) opposite to each other along the layer thickness direction. The installation adhesive layer 2 is arranged on the first surface, the repair coating 3 is arranged on the second surface, the surface of the installation adhesive layer 2 away from the substrate composite layer 1 is provided with an antistatic release film 5, and the surface of the repair coating 3 away from the substrate composite layer 1 is provided with a protective film 4.

[0029] Among them, the substrate composite layer 1 includes a first unit substrate layer 11, at least one surface of the first unit substrate layer 11 is provided with a recessed portion 10, at least the opening surface of the recessed portion 10 of the first unit substrate layer 11 is covered with a second unit substrate layer 12, the second unit substrate layer 12 is provided with a raised portion 120 that matches the recessed portion 10, a cavity is provided between the recessed portion 10 and the raised portion 120, and a blind hole 110 is provided at the bottom of the recessed portion 10.

[0030] The cavity provided between the recessed portion 10 and the raised portion 120 and the air stored in the blind hole 110 are regarded as a spring-damping system. The volume of the cavity and the cross-sectional area and depth of the blind hole are adjusted to obtain a resonance frequency that is the same as the incident frequency of the sound wave. Then, the air in the cavity and the blind hole resonates, converting the incident sound energy into heat energy and eliminating it, thereby achieving a sound insulation effect.

[0031] like Figure 1 As shown, in some embodiments, such as Option 1, the substrate composite layer 1 comprises a laminated structure of a second substrate layer and a first substrate layer. The first substrate layer 11 is made of polyethylene terephthalate (PET), and the second substrate layer 12 is made of thermoplastic polyurethane (TPU). PET offers high transparency, excellent mechanical strength, high tensile strength, and a certain degree of rigidity, and is chemically resistant to many common chemicals. Thermoplastic polyurethane (TPU) exhibits excellent elasticity and resilience, capable of self-healing after minor scratches. It is highly wear-resistant, suitable for long-term use, and chemically resistant to a wide range of chemicals. It is soft and easily formed, allowing it to conform to the curves of a vehicle body. It maintains good flexibility and elasticity even at low temperatures, and effectively blocks UV rays, reducing material degradation. The composite of PET and TPU increases surface hardness and scratch resistance, significantly enhancing overall protective performance. The combination of TPU's softness and PET's stability makes the car cover easier to install and better conforms to the curves of the vehicle body. Furthermore, the second unit substrate layer 12 is close to the repair coating 3. The recessed portion 10 is provided on the surface of the first unit substrate layer 11 made of PET material, which can maintain the volume contour of the cavity and optimize the sound insulation effect.

[0032] like Figure 2 As shown, in some preferred embodiments, such as Option 2: In order to ensure the mechanical strength of the color-changing film and further improve the sound insulation effect, the substrate composite layer 1 is a stacked structure of the second unit substrate layer / the first unit substrate layer / the second unit substrate layer, and both surfaces of the first unit substrate layer 11 are provided with recessed portions 10. The recessed portions 10 opposite to each other along the layer thickness direction are staggered, and are spaced apart between adjacent recessed portions 10 on the same plane.

[0033] like Figure 3As shown, in other preferred embodiments, such as scheme three: the substrate composite layer 1 is a stacked structure of the second unit substrate layer / the first unit substrate layer / the second unit substrate layer / the first unit substrate layer, wherein both first unit substrate layers 11 are provided with recessed portions 10, and the recessed portions 10 facing each other along the layer thickness direction are staggered, and adjacent recessed portions 10 on the same plane are spaced apart. The color-changing film with this stacked structure has better mechanical strength.

[0034] In some embodiments, such as Option 4: the substrate composite layer 1 is a stacked structure of the second unit substrate layer / first unit substrate layer / second unit substrate layer / first unit substrate layer / second unit substrate layer, which can further optimize the flexibility of the color-changing film.

[0035] The second unit substrate layer 12 is connected to the first unit substrate layer 11 via a connecting adhesive layer 112. At least one of the connecting adhesive layer 112, the first unit substrate layer 11, and the second unit substrate layer 12 is a color-changing layer. For example, in the substrate composite layer 1 of Scheme 2, Scheme 3, and Scheme 4, the connecting adhesive layer 112 is a color-changing layer, which is not only flexible in color adjustment but also not prone to precipitation and has good stability. In the substrate composite layer 1 of Scheme 1, the first unit substrate layer 11 is a color-changing layer. In Scheme 4, the substrate composite layer 1, which can also be the second unit substrate layer 12 of the intermediate layer, is a color-changing layer.

[0036] An anti-UV coating (not shown) is provided between the repair coating 3 and the composite substrate layer 1, or one of the first and second substrate layers 11, 12 is provided adjacent to the repair coating 3 as an anti-UV layer. The anti-UV coating is formed by adding an anti-UV agent to the polyurethane coating to further enhance the aging resistance of the color-changing film. The first and second substrate layers can be co-extruded by adding an anti-UV masterbatch to the raw materials to further enhance the anti-UV performance.

[0037] The installation adhesive layer 3 is an acrylic adhesive layer, and the connecting adhesive layer 112 is a polyurethane adhesive layer or an acrylic adhesive layer. Due to its high transparency and good weather resistance, acrylic adhesive is often used in color-changing films that need to maintain color vividness and glossiness for a long time. It helps to ensure that the appearance of the film is beautiful and does not change color for a long time. Due to its excellent elasticity and durability, polyurethane adhesive is widely used in situations where complex surfaces need to be dealt with or higher protection performance is required, thereby improving the overall toughness and protective effect of the color-changing film. The acrylic adhesive layer combines the convenience of rapid curing with good transparency and weather resistance. It is suitable for color-changing film projects that want to complete the installation quickly while ensuring quality. Its flexibility also helps to better fit the curves of the vehicle body.

[0038] The thickness of the repair coating 3 is 8-10 μm, the thickness of the base material composite layer 1 is 120-180 μm, and the thickness of the installation adhesive layer 2 is 25-30 μm.

[0039] 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 thermoplastic polyurethane color-changing film with sound insulation function, comprising: A substrate composite layer comprising a thermoplastic polyurethane material layer having a first surface and a second surface opposite to each other along the thickness direction of the layer; An installation adhesive layer is provided on the first surface; It is characterized in that the substrate composite layer includes a first unit substrate layer, at least one surface of the first unit substrate layer is provided with a recessed portion, at least the opening surface of the recessed portion of the first unit substrate layer is covered with a second unit substrate layer, the second unit substrate layer is provided with a raised portion that matches the recessed portion, a cavity is provided between the recessed portion and the raised portion, and a blind hole is provided at the bottom of the recessed portion.

2. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 1, characterized in that: The substrate composite layer is a stacked structure of the second unit substrate layer / first unit substrate layer, or the second unit substrate layer / first unit substrate layer / second unit substrate layer, or the second unit substrate layer / first unit substrate layer / second unit substrate layer / first unit substrate layer, or the second unit substrate layer / first unit substrate layer / second unit substrate layer / first unit substrate layer / second unit substrate layer.

3. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 2, characterized in that: The first unit base material layer is made of polyethylene terephthalate, and the second unit base material layer is made of thermoplastic polyurethane.

4. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 1 or 2, characterized in that: The second surface of the substrate composite layer is provided with a repair coating.

5. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 2, characterized in that: The second unit substrate layer is connected to the first unit substrate layer via a connecting adhesive layer, and at least one of the connecting adhesive layer, the first unit substrate layer, and the second unit substrate layer is a color-changing layer.

6. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 1 or 2, characterized in that: Both surfaces of the first unit substrate layer are provided with recessed portions, and the recessed portions that are opposite to each other along the layer thickness direction are staggered, and adjacent recessed portions in the same plane are spaced apart.

7. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 4, characterized in that: An anti-ultraviolet coating is provided between the repair coating and the substrate composite layer, or one of the first unit substrate layer and the second unit substrate layer is provided with an anti-ultraviolet layer close to the repair coating.

8. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 4, characterized in that: An antistatic release film is provided on the surface of the installation adhesive layer away from the substrate composite layer, and a protective film is provided on the surface of the repair coating layer away from the substrate composite layer.

9. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 5, characterized in that: The installation adhesive layer is an acrylic adhesive layer; the connection adhesive layer is a polyurethane adhesive layer or an acrylic adhesive layer.

10. The thermoplastic polyurethane color-changing film with sound insulation function according to claim 8, characterized in that: The thickness of the repair coating is 8-10 μm, the thickness of the substrate composite layer is 120-180 μm, and the thickness of the installation adhesive layer is 25-30 μm.

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