Composite polyurethane film and composite structure of composite polyurethane film and base film

Abstract

The utility model discloses a composite polyurethane film which comprises a first polyurethane base material layer, a second polyurethane base material layer and a third polyurethane base material layer, the second polyurethane base material layer is provided with a second concave part and a second surface opposite to the first surface; the first functional layer is arranged in the first sunken part and / or the second sunken part; the first adhesive layer is clamped between the first surface and the second surface; and the projection of the first concave part on the second surface along the film thickness direction is intersected with the adjacent second concave part or coincides with the outline of the plane part between the adjacent second concave parts. A first concave part and a second concave part which are arranged on the connected surfaces of the first polyurethane base material layer and the second polyurethane base material layer are used for accommodating the first functional layer to solve the problem of separation of raw materials of the functional layer; as the adjacent first concave parts and the adjacent second concave parts are still made of polyurethane materials, the film still keeps good toughness and bending resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of films, in particular to a composite polyurethane film and a composite structure thereof with a base film. Background Art

[0002] With its wide range of performance advantages, TPU film plays an important role in many fields, from high-tech aerospace applications to daily consumer goods.

[0003] Functionalized polyurethane films are made by adding functional masterbatches into the raw materials or by adding functional materials into the composite glue. The former is prone to masterbatch precipitation, while the latter is prone to increase the hardness of the glue layer, which has a negative impact on the toughness of the polyurethane film.

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

[0005] One of the purposes of the utility model is to overcome the defects existing in the prior art and provide a composite polyurethane film, which is used to accommodate the first functional layer and solve the problem of precipitation of the functional layer raw materials by means of the first recessed portion and the second recessed portion arranged on the connected surface of the first polyurethane substrate layer and the second polyurethane substrate layer; since the adjacent first recessed portions and the adjacent second recessed portions are still made of polyurethane material, the film still maintains good toughness and bending resistance.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: a composite polyurethane film, comprising:

[0007] A first polyurethane substrate layer having a first surface provided with a first recessed portion;

[0008] A second polyurethane substrate layer having a second surface provided with a second recessed portion and opposite to the first surface;

[0009] A first functional layer, disposed in the first recessed portion and / or the second recessed portion;

[0010] A first adhesive layer, sandwiched between the first surface and the second surface;

[0011] The projection of the first recessed portion on the second surface along the film thickness direction intersects with all adjacent second recessed portions, or coincides with the contour of the planar portion between adjacent second recessed portions.

[0012] A preferred technical solution is that it also includes a third polyurethane substrate layer, having a third surface on which a third recessed portion is arranged; the other surface of the first polyurethane substrate layer or the second polyurethane substrate layer is a fourth surface, the fourth surface is opposite to the third surface and is provided with a fourth recessed portion, and the projection of the third recessed portion on the fourth surface along the film thickness direction intersects with adjacent fourth recessed portions, or coincides with the contour of the planar portion between adjacent fourth recessed portions.

[0013] A preferred technical solution is that the second polyurethane substrate layer is sandwiched between the first polyurethane substrate layer and the third polyurethane substrate layer, and the projection of the second recessed portion on the fourth surface along the film thickness direction intersects with adjacent fourth recessed portions, or coincides with the contour of the planar portion between adjacent fourth recessed portions.

[0014] A preferred technical solution is that the third recessed portion and / or the fourth recessed portion is provided with a second functional layer.

[0015] A preferred technical solution is that the first functional layer and / or the second functional layer is one or more of a heat insulation layer, an anti-infrared layer, an anti-ultraviolet layer or an anti-oxidation layer.

[0016] A preferred technical solution is that the third polyurethane substrate layer is connected to the second polyurethane substrate layer via a second adhesive layer.

[0017] A preferred technical solution is that the first adhesive layer and the second adhesive layer are polyurethane pressure-sensitive adhesive layers or acrylic pressure-sensitive adhesive layers.

[0018] A preferred technical solution is that one outer surface of the first polyurethane substrate layer and the third polyurethane substrate layer is provided with a wear-resistant surface layer, and the other outer surface is provided with a mounting adhesive layer.

[0019] The second purpose of the utility model is to overcome the defects in the prior art and provide a composite structure of a composite polyurethane film and a base film, comprising the above-mentioned composite polyurethane film and the base film, wherein the base film is connected to the composite polyurethane film through a third adhesive layer.

[0020] A preferred technical solution is that the base film is a composite of one or more of a PET layer, a PU layer, a PVC layer, a PE layer and a PP layer.

[0021] The advantages and beneficial effects of the utility model are:

[0022] The composite polyurethane film has a reasonable structure, with a first recessed portion and a second recessed portion arranged on the connected surface of the first polyurethane substrate layer and the second polyurethane substrate layer, at least one of the two recessed portions is used to accommodate the first functional layer, thereby solving the problem of raw material precipitation of the functional layer;

[0023] Since the space between adjacent first recessed portions and between adjacent second recessed portions is still made of polyurethane material, the composite polyurethane film still maintains good toughness and bending resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of Example 1 of the composite polyurethane film of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of Example 2 of the composite polyurethane film of the utility model;

[0026] Figure 3 It is a structural schematic diagram of Example 3 of the composite polyurethane membrane of the utility model.

[0027] In the figure: 1-a, composite polyurethane film; 1-b, base film; 1, first polyurethane substrate layer; 2, second polyurethane substrate layer; 3, third polyurethane substrate layer; 4, wear-resistant surface layer; 5, mounting adhesive layer; 6, release film; 7, protective film; 11, first adhesive layer; 12, second adhesive layer; 13, third adhesive layer; 101, first surface; 102, second surface; 103, third surface; 104, fourth surface; 100, first recessed portion; 200, second recessed portion; 300, third recessed portion; 400, fourth recessed portion. DETAILED DESCRIPTION

[0028] 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.

[0029] The “outer surface” is based on the composite polyurethane film in normal use state, and is only for the convenience of describing the present invention and simplifying the description, and 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, and therefore cannot be understood as a limitation on the present invention.

[0030] 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.

[0031] like Figures 1 to 3As shown, the composite polyurethane film 1-a includes a first polyurethane substrate layer 1, a second polyurethane substrate layer 2, a first functional layer (not marked) and a first adhesive layer 11, wherein the first polyurethane substrate layer 1 has a first surface 101 on which a first recessed portion 100 is provided, the second polyurethane substrate layer 2 has a second surface 102 on which a second recessed portion 200 is provided and which is opposite to the first surface 101, and the first functional layer is provided in the first recessed portion 100 and / or the second recessed portion 200; the first adhesive layer 11 is sandwiched between the first surface 101 and the second surface 102, that is, the first polyurethane substrate layer 1 and the second polyurethane substrate layer 2 are connected by the adhesive layer.

[0032] Since the first functional layer is one or more of a heat insulation layer, an anti-infrared layer, an anti-ultraviolet layer or an anti-oxidation layer, in order for the functional layer to fully play its role in blocking or absorbing sunlight penetrating the composite polyurethane film in any direction, the projection of the first recessed portion 100 along the film thickness direction on the second surface 102 intersects with the adjacent second recessed portions 200, or coincides with the contour of the planar portion between the adjacent second recessed portions 200.

[0033] In order to optimize the structure of the composite polyurethane film, a third polyurethane substrate layer 3 is further included, and the third polyurethane substrate layer 3 has a third surface 103 provided with a third recessed portion 300; in some embodiments, the third polyurethane substrate layer 3 is connected to the first polyurethane substrate layer 1. In other embodiments, the third polyurethane substrate layer 3 is connected to the second polyurethane substrate layer 2.

[0034] When the second polyurethane substrate layer 2 is sandwiched between the first polyurethane substrate layer 1 and the third polyurethane substrate layer 3, the other surface of the second polyurethane substrate layer 2 is the fourth surface 104, the fourth surface 104 is opposite to the third surface 103 and is provided with a fourth recessed portion 400, and the projection of the third recessed portion 300 on the fourth surface 104 along the film thickness direction intersects with the adjacent fourth recessed portion 400, or coincides with the contour of the plane portion between the adjacent fourth recessed portions 400. Furthermore, the third recessed portion 300 and / or the fourth recessed portion 400 may be provided with a second functional layer (not marked) to give the composite polyurethane film multifunctionality. Among them, the second functional layer is one or more of a heat insulation layer, an anti-infrared layer, an anti-ultraviolet layer or an anti-oxidation layer.

[0035] Further, the projection of the second recessed portion 200 on the fourth surface 104 along the film thickness direction intersects with the adjacent fourth recessed portion 400, or coincides with the contour of the plane portion between the adjacent fourth recessed portions 400. The first recessed portion 100, the second recessed portion 200, the third recessed portion to the fourth recessed portion are intersected in the film thickness direction in sequence, and the flexibility of the polyurethane is still maintained between the adjacent first recessed portions 100. Similarly, the flexibility of the polyurethane is still maintained between the adjacent second recessed portions 200, the adjacent third recessed portions 300, and the adjacent fourth recessed portions 400. Even if the first recessed portion 100, the second recessed portion 200, the third recessed portion 300, and the fourth recessed portion 400 are provided with the first functional layer or the second functional layer, the outer bending and inner bending of the composite polyurethane are not affected.

[0036] The third polyurethane substrate layer 3 is connected to the second polyurethane substrate layer 2 through the second adhesive layer 12. The first adhesive layer 11 and the second adhesive layer 12 are polyurethane pressure-sensitive adhesive layers or acrylic pressure-sensitive adhesive layers. In order to improve the optical properties of the composite polyurethane film 1-a, such as light transmittance, the first adhesive layer 11 and the second adhesive layer 12 are both acrylic pressure-sensitive adhesive layers. In order to further improve the bending resistance of the composite polyurethane film, the first adhesive layer 11 and the second adhesive layer 12 are both polyurethane pressure-sensitive adhesive layers.

[0037] When the composite polyurethane film is used alone, one outer surface of the first polyurethane substrate layer 1 and the third polyurethane substrate layer 3 is provided with a wear-resistant surface layer 4, and the other outer surface is provided with a mounting adhesive layer 5. The wear-resistant surface layer 4 is formed by curing the polyurethane hardening coating liquid.

[0038] In some embodiments, when the composite polyurethane film 1-a is used in combination with the base film 1-b, it includes the above-mentioned composite polyurethane film 1-a, and the base film 1-b is connected to the composite polyurethane film 1-a through the third adhesive layer 13. Further, the base film 1-b is sandwiched between the composite polyurethane film 1-a and the installation adhesive layer 5.

[0039] The base film 1-b is a composite of one or more of a PET layer, a PU layer, a PVC layer, a PE layer and a PP layer.

[0040] The PET layer (polyethylene terephthalate) has the advantages of high transparency, good weather resistance, strong rigidity, good dimensional stability, and chemical corrosion resistance; although it has disadvantages such as greater brittleness and poor low-temperature toughness. However, after being compounded with TPU, it combines the high transparency and rigidity of PET with the elasticity and wear resistance of TPU, and can be used to produce high-performance transparent films, protective covers, etc., to improve the scratch resistance and impact resistance of the product.

[0041] The PU layer (polyurethane) has the advantages of wear resistance, tear resistance, good elasticity, oil and chemical resistance, and high plasticity. After compounding with TPU, since PU and TPU have similar properties, the combination of the two can further enhance the product's wear resistance, elasticity and chemical resistance. It is suitable for high-end sports equipment, footwear, leather substitutes, etc.

[0042] The PVC layer (polyvinyl chloride) has the advantages of low cost, easy processing, chemical corrosion resistance, flame retardancy, etc. After being compounded with TPU, the cost-effectiveness and processing convenience of PVC are combined with the environmental protection and elasticity of TPU to develop a cost-effective flexible material suitable for flooring, waterproof materials, etc.

[0043] The PE layer (polyethylene) is light, soft, low temperature resistant, and has good chemical stability. Although it has disadvantages such as low strength and heat resistance, after being compounded with TPU, the softness of PE and the mechanical strength of TPU can be combined to obtain a composite material that is both soft and durable, which is suitable for hoses, cable sheaths, food packaging and other fields.

[0044] The PP layer (polypropylene) has low density, good heat resistance, chemical corrosion resistance, and easy recycling. After compounding with TPU, the lightweight and heat resistance of PP, combined with the high elasticity and toughness of TPU, can produce a lightweight and durable composite material suitable for automotive interiors, home appliance housings, etc.

[0045] Example 1

[0046] like Figure 1 As shown, the composite polyurethane film 1-a of Example 1 includes a first polyurethane substrate layer 1, a second polyurethane substrate layer 2, a third polyurethane substrate layer 3, a first functional layer, a second functional layer, a first adhesive layer 11 and a second adhesive layer 12, the second polyurethane substrate layer 2 is sandwiched between the first polyurethane substrate layer 1 and the third polyurethane substrate layer 3, wherein the first polyurethane substrate layer 1 has a first surface 101 provided with a first recessed portion 100, the second polyurethane substrate layer 2 has a second surface 102 provided with a second recessed portion 200 and opposite to the first surface 101, the other surface of the second polyurethane substrate layer 2 is a fourth surface 104, the third polyurethane substrate layer 3 has a third surface 103 provided with a third recessed portion 300, and the fourth surface 104 is opposite to the third surface 103 and provided with a fourth recessed portion 400. The projection of the first recessed portion 100 on the second surface 102 along the film thickness direction coincides with the contour of the plane portion between adjacent second recessed portions 200. The projection of the third recessed portion 300 along the film thickness direction on the fourth surface 104 coincides with the contour of the plane portion between adjacent fourth recessed portions 400. The projection of the second recessed portion 200 along the film thickness direction on the fourth surface 10 coincides with the contour of the plane portion between adjacent fourth recessed portions 400.

[0047] The first adhesive layer 11 is sandwiched between the first surface 101 and the second surface 102, that is, the first polyurethane substrate layer 1 and the second polyurethane substrate layer 2 are connected by the adhesive layer. The third polyurethane substrate layer 3 is connected to the second polyurethane substrate layer 2 through the second adhesive layer 12. The first adhesive layer 11 and the second adhesive layer 12 are polyurethane pressure-sensitive adhesive layers.

[0048] The first functional layer is disposed in the first recessed portion 100 and the second recessed portion 200 , and the second functional layer is disposed in the third recessed portion 300 and the fourth recessed portion 400 , wherein the first functional layer is a heat insulation layer and the second functional layer is an anti-oxidation layer.

[0049] The outer surface of the first polyurethane substrate layer 1 is provided with a wear-resistant surface layer 4 , and the outer surface of the third polyurethane substrate layer 3 is provided with a mounting adhesive layer 5 .

[0050] The composite structure of the composite polyurethane film 1-a and the base film 1-b includes the composite polyurethane film 1-a and the base film 1-b, the base film 1-b is connected to the composite polyurethane film 1-a through the third adhesive layer 13, and the base film 1-b is sandwiched between the composite polyurethane film 1-a and the installation adhesive layer 5. The base film 1-b is a PET layer. The surface of the installation adhesive layer 5 away from the composite polyurethane film 1-a is provided with a release film 6. The surface of the wear-resistant surface layer 4 away from the first polyurethane substrate layer 1 is provided with a protective film 7.

[0051] Example 2

[0052] like Figure 2 As shown, Embodiment 2 is based on Embodiment 1, except that the first functional layer is disposed in the first recessed portion 100 and the third recessed portion 300 , and the second functional layer is disposed in the second recessed portion 200 and the fourth recessed portion 400 .

[0053] Example 3

[0054] like Figure 3 As shown, Example 3 is based on Example 1, and the difference is that the composite polyurethane film 1-a includes a first polyurethane substrate layer 1 and a second polyurethane substrate layer 2, the first polyurethane substrate layer 1 has a first surface 101 provided with a first recessed portion 100, the second polyurethane substrate layer 2 has a second surface 102 provided with a second recessed portion 200 and opposite to the first surface 101, and the projection of the first recessed portion 100 on the second surface 102 along the film thickness direction coincides with the contour of the plane portion between adjacent second recessed portions 200. The first polyurethane substrate layer 1 and the second polyurethane substrate layer 2 are connected by a first adhesive layer 12, and the first recessed portion 100 and the second recessed portion 200 are provided with a first functional layer, which is an anti-ultraviolet layer.

[0055] 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 composite polyurethane film, characterized in that: include: A first polyurethane substrate layer having a first surface provided with a first recessed portion; A second polyurethane substrate layer having a second surface provided with a second recessed portion and opposite to the first surface; A first functional layer, disposed in the first recessed portion and / or the second recessed portion; A first adhesive layer, sandwiched between the first surface and the second surface; The projection of the first recessed portion on the second surface along the film thickness direction intersects with all adjacent second recessed portions, or coincides with the contour of the planar portion between adjacent second recessed portions.

2. The composite polyurethane film according to claim 1, characterized in that It also includes a third polyurethane substrate layer having a third surface on which a third recessed portion is arranged; the other surface of the first polyurethane substrate layer or the second polyurethane substrate layer is a fourth surface, the fourth surface is opposite to the third surface and is provided with a fourth recessed portion, and the projection of the third recessed portion on the fourth surface along the film thickness direction intersects with adjacent fourth recessed portions, or coincides with the contour of the planar portion between adjacent fourth recessed portions.

3. The composite polyurethane film according to claim 2, characterized in that: The second polyurethane substrate layer is sandwiched between the first polyurethane substrate layer and the third polyurethane substrate layer, and the projection of the second recessed portion on the fourth surface along the film thickness direction intersects with adjacent fourth recessed portions, or coincides with the contour of the planar portion between adjacent fourth recessed portions.

4. The composite polyurethane film according to claim 2 or 3, characterized in that: The third recessed portion and / or the fourth recessed portion is / are provided with a second functional layer.

5. The composite polyurethane film according to claim 4, characterized in that: The first functional layer and / or the second functional layer is one or more of a heat insulation layer, an anti-infrared layer, an anti-ultraviolet layer or an anti-oxidation layer.

6. The composite polyurethane film according to claim 2 or 3, characterized in that: The third polyurethane base layer is connected to the second polyurethane base layer through a second adhesive layer.

7. The composite polyurethane film according to claim 6, characterized in that: The first adhesive layer and the second adhesive layer are polyurethane pressure-sensitive adhesive layers or acrylic pressure-sensitive adhesive layers.

8. The composite polyurethane film according to claim 3, characterized in that: The first polyurethane base material layer and the third polyurethane base material layer have a wear-resistant surface layer on one outer surface and a mounting adhesive layer on the other outer surface.

9. A composite structure of a composite polyurethane film and a base film, characterized in that: It comprises the composite polyurethane film according to any one of claims 1 to 8 and a base film, wherein the base film is connected to the composite polyurethane film via a third adhesive layer.

10. The composite structure of the composite polyurethane film and the base film according to claim 9, characterized in that: The base film is a composite of one or more of a PET layer, a PU layer, a PVC layer, a PE layer and a PP layer.

Images