Composite polyester film with ultraviolet aging resistance

Abstract

The utility model discloses a kind of composite polyester film with ultraviolet aging resistance, belong to composite polyester film technical field, its technical scheme main points include film body, the film body includes functional protection layer, ultraviolet reflection layer, first ultraviolet resistant layer, substrate layer, second ultraviolet resistant layer;The first ultraviolet resistant layer and second ultraviolet resistant layer are respectively arranged at the two sides of substrate layer, by ultraviolet reflection layer and ultraviolet resistant layer in substrate layer two sides symmetry arrangement, make film main body have higher ultraviolet aging resistance, when film is exposed to ultraviolet environment, ultraviolet reflection layer can efficiently reflect most of incident ultraviolet light, and the ultraviolet light not reflected is further absorbed and converted by first ultraviolet resistant layer and second ultraviolet resistant layer, by the double protection arrangement of reflection and absorption, ensure that the ultraviolet light from two directions incident can be effectively blocked.

Description

Technical Field

[0001] This utility model relates to the field of composite polyester film technology, and in particular to a composite polyester film with UV aging resistance. Background Technology

[0002] Composite polyester films are widely used in packaging, building materials, electronics and other fields due to their excellent mechanical properties, light transmittance and chemical stability.

[0003] Existing traditional composite polyester films are prone to aging phenomena such as yellowing, embrittlement, and mechanical property degradation due to molecular chain breakage caused by long-term outdoor use or strong ultraviolet radiation, which seriously affects their service life and functional stability.

[0004] Therefore, a composite polyester film with UV aging resistance is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a composite polyester film with UV aging resistance, which can solve the problem that existing traditional composite polyester films are prone to aging phenomena such as yellowing, embrittlement, and mechanical property degradation due to molecular chain breakage caused by long-term outdoor use or strong ultraviolet environment, which seriously affects their service life and functional stability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a composite polyester film with UV aging resistance, comprising a film body, wherein the film body comprises a functional protective layer, a UV reflective layer, a first UV-resistant layer, a substrate layer, and a second UV-resistant layer;

[0007] The first UV-resistant layer and the second UV-resistant layer are respectively disposed on both sides of the substrate layer, and the UV-reflective layer is respectively disposed on the side close to the first UV-resistant layer and the second UV-resistant layer;

[0008] The functional protective layer includes a wear-resistant surface layer and a damage-resistant layer, which are sequentially disposed on the side closest to the ultraviolet reflective layer.

[0009] Preferably, the ultraviolet reflective layer is a polyester composite layer containing a nano-ultraviolet shielding agent.

[0010] Preferably, both the first and second UV-resistant layers are polyester coatings containing UV absorbers, and the thickness is 5-10 μm.

[0011] Preferably, a transition layer is provided between the ultraviolet reflective layer and the first ultraviolet resistant layer, and between the ultraviolet reflective layer and the second ultraviolet resistant layer.

[0012] Preferably, the transition layer is a modified polyolefin layer.

[0013] Preferably, the wear-resistant surface layer is a polycarbonate layer containing nano-alumina with a thickness of 8-15 μm.

[0014] Preferably, the functional protective layer is a fluoropolymer layer.

[0015] Preferably, the surface of the wear-resistant layer is provided with an anti-fingerprint coating, which is a nano-coating containing fluorosiloxane.

[0016] Preferably, a first adhesive layer is provided between the first UV-resistant layer and the substrate layer, the first adhesive layer being a polyurethane adhesive layer with a thickness of 2-5 μm.

[0017] Preferably, a second adhesive layer is provided between the second UV-resistant layer and the substrate layer, the second adhesive layer being an epoxy adhesive layer with a thickness of 2-5 μm.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This application provides a high degree of UV aging resistance to the film body by symmetrically setting a UV reflective layer and a UV resistant layer on both sides of the substrate layer. When the film is exposed to the UV environment, the UV reflective layer can efficiently reflect most of the incident UV light, while the unreflected UV light is further absorbed and converted by the first UV resistant layer and the second UV resistant layer. Through the dual protection setting of reflection and absorption, it is ensured that UV light incident from both directions can be effectively blocked.

[0020] 2. This application enhances the scratch resistance of the film by using a wear-resistant surface layer in the functional protective layer, while the anti-damage layer enhances the impact resistance. Combined with the anti-fingerprint coating, the surface properties are optimized, so that the film can meet the comprehensive requirements of mechanical properties and surface quality in multiple scenarios while possessing the core advantage of UV aging resistance. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the composite polyester film with UV aging resistance of this utility model.

[0022] Figure 2 This is a partial cross-sectional schematic diagram of the thin film body of this utility model;

[0023] Figure 3 This is a partial cross-sectional schematic diagram of the functional protective layer of this utility model;

[0024] Figure 4 This is a cross-sectional schematic diagram of a partial structure of the thin film body of this utility model;

[0025] Figure 5This is a cross-sectional schematic diagram of the substrate layer, the first UV-resistant layer, and the second UV-resistant layer of this utility model.

[0026] In the figure, 1 is the film body; 2 is the functional protective layer; 21 is the wear-resistant surface layer; 22 is the anti-damage layer; 3 is the ultraviolet reflective layer; 4 is the first ultraviolet-resistant layer; 5 is the substrate layer; 6 is the transition layer; 7 is the anti-fingerprint coating; 8 is the first adhesive layer; 9 is the second adhesive layer; and 10 is the second ultraviolet-resistant layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-5 The present invention provides the following technical solution:

[0029] A composite polyester film with UV aging resistance includes a film body 1, which includes a functional protective layer 2, a UV reflective layer 3, a first UV resistant layer 4, a substrate layer 5, and a second UV resistant layer 10.

[0030] The first UV-resistant layer 4 and the second UV-resistant layer 10 are respectively disposed on both sides of the substrate layer 5, and the UV-reflective layer 3 is respectively disposed on the side close to the first UV-resistant layer 4 and the second UV-resistant layer 10.

[0031] The functional protective layer 2 includes a wear-resistant surface layer 21 and a damage-resistant layer 22, which are sequentially disposed on the side close to the ultraviolet reflective layer 3.

[0032] In this embodiment: by symmetrically setting an ultraviolet reflective layer 3 and an ultraviolet resistant layer on both sides of the substrate layer 5, the film body has high resistance to ultraviolet aging. When the film is exposed to the ultraviolet environment, the ultraviolet reflective layer 3 can efficiently reflect most of the incident ultraviolet light, while the unreflected ultraviolet light is further absorbed and converted by the first ultraviolet resistant layer 4 and the second ultraviolet resistant layer 10. Through the dual protection setting of reflection and absorption, it is ensured that ultraviolet light incident from both directions can be effectively blocked. The wear-resistant surface layer 21 in the functional protective layer 2 improves the scratch resistance of the film, while the anti-damage layer 22 enhances the impact resistance. Combined with the anti-fingerprint coating 7, the surface performance is optimized, so that the film has the core advantage of resistance to ultraviolet aging while meeting the comprehensive requirements of mechanical properties and surface quality in multiple scenarios.

[0033] Specifically, such as Figure 2As shown, the ultraviolet reflective layer 3 is a polyester composite layer containing nano-ultraviolet shielding agent.

[0034] Specifically, such as Figure 2 As shown, the first UV-resistant layer 4 and the second UV-resistant layer 10 are both polyester coatings containing UV absorbers, and their thickness is 5-10 μm.

[0035] Specifically, such as Figure 4 As shown, a transition layer 6 is provided between the ultraviolet reflective layer 3 and the first ultraviolet resistant layer 4, and between the ultraviolet reflective layer 3 and the second ultraviolet resistant layer 10.

[0036] Specifically, such as Figure 4 As shown, transition layer 6 is a modified polyolefin layer.

[0037] In this embodiment: the ultraviolet reflective layer 3 is a polyester composite layer containing nano-ultraviolet shielding agents. The nano-ultraviolet shielding agents (such as nano-titanium dioxide, zinc oxide, etc.) have excellent ultraviolet light reflection and scattering capabilities, which can physically block ultraviolet light penetration and reduce the intensity of ultraviolet light irradiation on the subsequent ultraviolet-resistant layer and substrate layer 5; the first ultraviolet-resistant layer 4 and the second ultraviolet-resistant layer 10 are polyester coatings containing ultraviolet absorbers. The ultraviolet absorbers (such as benzotriazoles, benzophenones) can chemically absorb ultraviolet light and convert it into harmless heat energy. At the same time, in conjunction with the ultraviolet reflective layer 3, they can significantly improve the overall ultraviolet protection efficiency; the transition layer 6 can alleviate the interfacial stress caused by the difference in material properties between the reflective layer and the ultraviolet-resistant layer, avoid interlayer cracking or peeling, and improve the durability of the overall structure.

[0038] Specifically, such as Figure 3 As shown, the wear-resistant surface layer 21 is a polycarbonate layer containing nano-alumina, with a thickness of 8-15μm.

[0039] Specifically, such as Figure 3 As shown, the functional protective layer 2 is a fluoropolymer layer.

[0040] Specifically, such as Figure 3 As shown, the surface of the wear-resistant surface layer 21 is provided with an anti-fingerprint coating 7, which is a nano-coating containing fluorinated siloxane.

[0041] In this embodiment: the wear-resistant surface layer 21 is a polycarbonate layer containing nano-alumina. Nano-alumina has high hardness, which can significantly improve the scratch resistance of the surface layer, resist the damage to the film surface caused by friction and collision in daily use, and protect the internal ultraviolet protection layer from physical damage; the functional protective layer 2 is a fluoropolymer layer. Fluoropolymers (such as polytetrafluoroethylene and polyvinylidene fluoride) have excellent chemical corrosion resistance and weather resistance, which can resist the erosion of acids, alkalis, organic solvents and atmospheric pollutants, and protect the internal structure from chemical damage; the surface of the wear-resistant surface layer 21 is provided with a nano-anti-fingerprint coating 7 containing fluorosiloxane. Fluorosiloxane has ultra-low surface energy, which can effectively repel fingerprint grease and water stains, reduce fingerprint residue, and maintain the appearance of the film surface. It is especially suitable for scenarios with high appearance requirements, such as the protection of electronic devices.

[0042] Specifically, such as Figure 5 As shown, a first adhesive layer 8 is provided between the first UV-resistant layer 4 and the substrate layer 5. The first adhesive layer 8 is a polyurethane adhesive layer with a thickness of 2-5 μm.

[0043] Specifically, such as Figure 5 As shown, a second adhesive layer 9 is provided between the second UV-resistant layer 10 and the substrate layer 5. The second adhesive layer 9 is an epoxy adhesive layer with a thickness of 2-5 μm.

[0044] In this embodiment: a first adhesive layer 8 of polyurethane adhesive is provided between the first UV-resistant layer 4 and the substrate layer 5. The polyurethane adhesive has excellent bonding strength and flexibility, which can tightly connect the first UV-resistant layer 4 and the substrate layer 5, ensuring no gaps between the layers and avoiding interface aging caused by moisture and impurities penetrating in; a second adhesive layer 9 of epoxy adhesive is provided between the second UV-resistant layer 10 and the substrate layer 5. The epoxy adhesive has high bonding strength and good chemical stability, which can ensure a firm bond between the second UV-resistant layer 10 and the substrate layer 5.

[0045] Working principle: When the film body 1 is exposed to the ultraviolet environment, the outermost functional protective layer 2 first resists physical damage such as external friction and impact. Among them, the wear-resistant surface layer 21 blocks scratches, the damage-resistant layer 22 buffers impacts, and the anti-fingerprint coating 7 reduces the adhesion of surface stains. The ultraviolet reflective layer 3, through the nano ultraviolet shielding agent it contains, physically reflects and scatters the incident ultraviolet light, initially weakening the intensity of ultraviolet light. The residual ultraviolet light that passes through the reflective layer is chemically absorbed by the ultraviolet absorbers in the first ultraviolet-resistant layer 4 and the second ultraviolet-resistant layer 10, converting the ultraviolet energy into harmless heat energy and preventing it from penetrating to the substrate layer 5. The transition layer 6 ensures the stable bonding between the reflective layer and the ultraviolet-resistant layer, and the first adhesive layer 8 and the second adhesive layer 9 respectively strengthen the connection between the ultraviolet-resistant layer and the substrate layer 5, preventing interlayer peeling. Under multiple protections, the substrate layer 5 effectively avoids molecular chain breakage, maintains its own mechanical properties and stability, and thus realizes the reliable use of the film in a long-term ultraviolet irradiation environment.

[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite polyester film with UV aging resistance, comprising a film body (1), characterized in that: The thin film body (1) includes a functional protective layer (2), an ultraviolet reflective layer (3), a first ultraviolet resistant layer (4), a substrate layer (5), and a second ultraviolet resistant layer (10); The first UV-resistant layer (4) and the second UV-resistant layer (10) are respectively disposed on both sides of the substrate layer (5), and the UV-reflective layer (3) is respectively disposed on the side close to the first UV-resistant layer (4) and the second UV-resistant layer (10); The functional protective layer (2) includes a wear-resistant surface layer (21) and a damage-resistant layer (22), which are sequentially disposed on one side close to the ultraviolet reflective layer (3).

2. The composite polyester film with UV aging resistance according to claim 1, characterized in that: The ultraviolet reflective layer (3) is a polyester composite layer containing nano-ultraviolet shielding agent.

3. The composite polyester film with UV aging resistance according to claim 1, characterized in that: The first UV-resistant layer (4) and the second UV-resistant layer (10) are both polyester coatings containing UV absorbers, and the thickness is 5-10 μm.

4. A composite polyester film with UV aging resistance according to claim 1, characterized in that: A transition layer (6) is provided between the ultraviolet reflective layer (3) and the first ultraviolet resistant layer (4), and between the ultraviolet reflective layer (3) and the second ultraviolet resistant layer (10).

5. A composite polyester film with UV aging resistance according to claim 4, characterized in that: The transition layer (6) is a modified polyolefin layer.

6. A composite polyester film with UV aging resistance according to claim 1, characterized in that: The wear-resistant surface layer (21) is a polycarbonate layer containing nano-alumina with a thickness of 8-15 μm.

7. A composite polyester film with UV aging resistance according to claim 1, characterized in that: The functional protective layer (2) is a fluoropolymer layer.

8. A composite polyester film with UV aging resistance according to claim 1, characterized in that: The surface of the wear-resistant surface layer (21) is provided with an anti-fingerprint coating (7), which is a nano-coating containing fluorinated siloxane.

9. A composite polyester film with UV aging resistance according to claim 1, characterized in that: A first adhesive layer (8) is provided between the first UV-resistant layer (4) and the substrate layer (5). The first adhesive layer (8) is a polyurethane adhesive layer with a thickness of 2-5 μm.

10. A composite polyester film with UV aging resistance according to claim 1, characterized in that: A second adhesive layer (9) is provided between the second UV-resistant layer (10) and the substrate layer (5). The second adhesive layer (9) is an epoxy adhesive layer with a thickness of 2-5 μm.

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