Recyclable PETG decorative film

Abstract

The utility model discloses a recyclable PETG (Polyethylene Terephthalate Glycol) decorative film which comprises an anti-impact layer made of a PETG material and arranged in two layers; the core layer is clamped between the two anti-impact layers; a degradation layer or a compatible layer is arranged between the anti-impact layer and the core layer; the anti-impact layer is an anti-oxidation layer or a light stabilizing layer, and / or the anti-oxidation layer or the light stabilizing layer is arranged on the surface, far away from the core layer, of the anti-impact layer. The recyclable PETG decorative film is reasonable in structure, the degradation layer is arranged between the anti-impact layer and the core layer, so that the quality of a chemical recycled material is improved, the decorative film is promoted to form small molecules during degradation, and the environmental pollution is reduced; through the compatibility layer, the interface bonding force between different material layers is improved, layering is prevented, the compatibility between physical recycled materials is improved, and the mechanical comprehensive performance of the recycled materials is optimized; in combination with the arrangement of an anti-oxidation layer or a light stabilizing layer, the durability of the decorative film is improved, aging is prevented, and the stability and the reusability of the recycled material in the recycling process are also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of decorative films, in particular to a recyclable PETG decorative film. Background Art

[0002] Polyethylene terephthalate glycol-1,4-cyclohexanedimethanol (PETG) is a modified polyester that produces CO2 and H2O upon combustion or decomposition. It is considered an excellent environmentally friendly material with high light transmittance, good weather resistance, heat sealability and wear resistance.

[0003] As people's demands for higher quality of life and environmental awareness gradually increase, PETG has gradually replaced PET, PP, PVC, PMMA and PC in the field of decorative films. With the large-scale use of PETG materials, its effective recycling and reuse has become an urgent need.

[0004] Common methods for recycling and reusing PETG materials include: bio-enzymatic hydrolysis, physical and chemical recycling. Chemical recycling methods typically use alcoholysis or thermal cracking to heat-treat polyester materials to obtain ethylene terephthalate monomers, which are then recombined with diols for reuse. However, during heat treatment, it is difficult to ensure that all polyester fragments are heated uniformly and cracked into monomers. Polymers such as ethylene terephthalate dimers and trimers will be produced. Polymers not only require more heat but also experience more thermal stress due to prolonged heating. The mechanical properties of the recycled films are poor. Physical recycling methods are prone to incompatibility issues when recycling decorative films made from multiple composite materials, resulting in poor mechanical properties of products made from recycled materials.

[0005] Therefore, it is necessary to improve the recyclable PETG decorative film of the prior art. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects existing in the prior art and provide a recyclable PETG decorative film. By providing a degradation layer between the impact-resistant layer and the core layer, the quality of the chemically recycled material is improved, and the decorative film is prompted to form small molecules during degradation to reduce environmental pollution. By providing a compatibility layer, the interface bonding force between layers of different materials is improved to prevent delamination, and the compatibility between physical recycled materials is improved, thereby optimizing the comprehensive mechanical properties of the recycled materials. Combined with the provision of an anti-oxidation layer or a light-stabilizing layer, not only the durability of the decorative film is improved to prevent aging, but also the stability and reusability of the recycled materials during the recycling process are improved.

[0007] In order to achieve the above technical effects, the technical solution of the utility model is: a recyclable PETG decorative film, comprising:

[0008] The impact-resistant layer is made of PETG material and has a double-layer setting;

[0009] A core layer, sandwiched between the two impact-resistant layers;

[0010] A degradation layer or a compatibility layer is provided between the impact-resistant layer and the core layer;

[0011] The impact-resistant layer is an anti-oxidation layer or a light-stabilizing layer, and / or the surface of the impact-resistant layer away from the core layer is provided with an anti-oxidation layer or a light-stabilizing layer.

[0012] A preferred technical solution is that the core layer is made of PET, and a compatible layer is sandwiched between the impact-resistant layer and the core layer.

[0013] The preferred technical solution is that the compatibility layer is maleic anhydride grafted PET.

[0014] A preferred technical solution is that the core layer is made of PETG or PET, and a degradation layer is sandwiched between the impact-resistant layer and the core layer.

[0015] A preferred technical solution is that the degradation layer contains a copolymer of polylactic acid and itaconic acid.

[0016] A preferred technical solution is that a repair coating is provided on the surface of the impact-resistant layer away from the core layer, and the repair coating is the surface layer of the decorative film.

[0017] A preferred technical solution is that the material of the repair coating is a polyurethane coating.

[0018] A preferred technical solution is that the thickness of the impact-resistant layer accounts for 5% to 15% of the total thickness of the decorative film.

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

[0020] The recyclable PETG decorative film has a reasonable structure. The degradation layer set between the impact-resistant layer and the core layer promotes the production of monomers during heat treatment of the decorative film, facilitates the implementation of chemical recycling and improves the quality of recycled materials. It also encourages the decorative film to form small molecules during degradation to reduce environmental pollution.

[0021] Alternatively, by setting a compatibility layer between the impact-resistant layer and the core layer, the interfacial bonding strength between different material layers can be improved to prevent delamination, as well as the compatibility between physical recycled materials, thereby optimizing the mechanical properties of recycled materials, thereby increasing recycling rates and reducing energy consumption;

[0022] The provision of an anti-oxidation layer or a light-stabilizing layer not only improves the durability of the decorative film and prevents aging, but also improves the stability and reusability of the recycled material during the recycling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic structural diagram of Example 1 of the recyclable PETG decorative film of the utility model;

[0024] Figure 2 It is a structural schematic diagram of Example 2 of the recyclable PETG decorative film of the present utility model.

[0025] In the figure: 1, impact-resistant layer; 2, core layer; 3, repair coating; 11, degradation layer; 12, compatibility layer. DETAILED DESCRIPTION

[0026] 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.

[0027] The terms "core layer" and "surface layer" are based on the normal use state of the recyclable PETG decorative film and are only used to facilitate the description of the present invention and simplify the description. They do 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, they should not be understood as limiting the present invention.

[0028] 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.

[0029] like Figures 1-2 As shown, the recyclable PETG decorative film disclosed in the present invention includes an impact-resistant layer 1 and a core layer 2. The impact-resistant layer 1 is made of PETG and is arranged in two layers; the core layer 2 is sandwiched between the two layers of impact-resistant layers 1; a degradation layer 11 or a compatibility layer 12 is arranged between the impact-resistant layer 1 and the core layer 2.

[0030] In some embodiments, the impact-resistant layer 1 is an anti-oxidation layer or a light-stabilizing layer.

[0031] In some embodiments, an anti-oxidation layer or a light-stabilizing layer is provided on the surface of the impact-resistant layer 1 away from the core layer 2 .

[0032] In some embodiments, the impact-resistant layer 1 is an anti-oxidation layer, and a light-stabilizing layer is provided on the surface of the impact-resistant layer 1 away from the core layer; or the impact-resistant layer 1 is a light-stabilizing layer, and an anti-oxidation layer is provided on the surface of the impact-resistant layer 1 away from the core layer.

[0033] By setting a degradation layer between the impact-resistant layer and the core layer, the decorative film is promoted to produce monomers during heat treatment, which facilitates the implementation of chemical recycling methods and improves the quality of recycled materials. It also encourages the decorative film to form small molecules during degradation to reduce environmental pollution. Or by setting a compatibility layer between the impact-resistant layer and the core layer, the interface bonding strength between different material layers is improved to prevent stratification, and the compatibility between physical recycled materials is improved, the mechanical properties of recycled materials are optimized, and thus the recycling rate is increased and energy consumption is reduced. The setting of an antioxidant layer or a light-stabilizing layer not only improves the durability of the decorative film and prevents aging, but also improves the stability and reusability of the recycled materials during the recycling process.

[0034] In some embodiments, the core layer 2 is made of PET, and a compatibility layer 12 is sandwiched between the impact-resistant layer 1 and the core layer 2. Furthermore, the compatibility layer 12 is maleic anhydride-grafted PET. Maleic anhydride (MAH) is a compound containing carboxyl groups (-COOH) and anhydride groups (-CO-O-CO-). These functional groups can chemically react with the hydroxyl (-OH) and carboxyl groups (-COOH) in PET and PETG, forming chemical bridges and thus improving their compatibility. Furthermore, the maleic anhydride-grafted PET acts as a "surfactant" at the interface between PET and PETG, with one end being compatible with PET and the other with PETG. This creates a transition layer between the impact-resistant layer and the core layer, or between the two polymers, to reduce interfacial tension, increase interfacial bonding, and prevent phase separation, thereby improving the overall performance of the decorative film or recycled material.

[0035] In some embodiments, the core layer 2 is made of PETG or PET, and a degradation layer 11 is sandwiched between the impact-resistant layer 1 and the core layer 2. Furthermore, the degradation layer 11 comprises a copolymer of polylactic acid and itaconic acid. Furthermore, the degradation layer 11 further comprises PETG or PET, with the copolymer comprising 5% to 8% of the total mass of the degradation layer. The role of the degradation layer 11: Since PLA and PETG have certain similarities in chemical structure, and the introduction of itaconic acid can further improve its compatibility with PET, PLA-IA copolymer can be used as a compatibilizer for PETG and PET; PLA-IA copolymer forms a chemical bridge at the interface of PETG and PET, reducing phase separation and improving interfacial bonding strength; PLA-IA copolymer can improve the strength and toughness of the decorative film, making it less likely to break when subjected to force, and is suitable for applications requiring high mechanical properties; PLA-IA copolymer can improve the processing performance of PETG or PET, making it easier to flow during injection molding, extrusion and other processing processes, reducing processing defects; PLA-IA copolymer can increase the heat deformation temperature of the decorative film, so that it can still maintain good mechanical properties at high temperatures, and is suitable for applications in high temperature environments.

[0036] In some embodiments, a repair coating 3 is provided on the surface of the impact-resistant layer 1 away from the core layer 2. The repair coating 3 serves as the surface layer of the decorative film. Furthermore, the repair coating 3 is made of a polyurethane coating. This improves the decorative film's wear resistance, scratch resistance, and chemical resistance, further enhances its impact resistance, and improves its surface gloss.

[0037] To optimize the thickness of the decorative film and thus improve its mechanical properties, the impact-resistant layer 1 accounts for 5% to 15% of the total thickness of the decorative film. The ratio of the thickness of the degradation layer 11 or the compatibilizing layer 12 to the thickness of the impact-resistant layer 1 is (1-2):1, and the total thickness of the decorative film is 150-500 μm.

[0038] Example 1

[0039] like Figure 1 As shown, the recyclable PETG decorative film of Example 1 includes an impact-resistant layer 1 and a core layer 2. The impact-resistant layer 1 is made of PETG and is arranged in two layers. The core layer 2 is sandwiched between the two layers of impact-resistant layers 1. The core layer 2 is made of PET. A compatibility layer 12 is provided between the impact-resistant layer 1 and the core layer 2. The impact-resistant layer 1 is an anti-oxidation layer, and a repair coating 3 is provided on the surface of the impact-resistant layer 1 away from the core layer 2.

[0040] Example 2

[0041] like Figure 2 As shown, Example 2 is based on Example 1, with the difference that the core layer 2 is made of PETG, and a degradation layer 11 is sandwiched between the impact-resistant layer 1 and the core layer 2.

[0042] 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 recyclable PETG decorative film, characterized in that: include: The impact-resistant layer is made of PETG material and has a double-layer setting; A core layer, sandwiched between the two impact-resistant layers; A degradation layer or a compatibility layer is provided between the impact-resistant layer and the core layer; The impact-resistant layer is an anti-oxidation layer or a light-stabilizing layer, and / or the surface of the impact-resistant layer away from the core layer is provided with an anti-oxidation layer or a light-stabilizing layer.

2. The recyclable PETG decorative film according to claim 1, characterized in that: The core layer is made of PET, and a compatibility layer is sandwiched between the impact-resistant layer and the core layer.

3. The recyclable PETG decorative film according to claim 2, characterized in that: The compatibility layer is maleic anhydride grafted PET.

4. The recyclable PETG decorative film according to claim 1, characterized in that: The core layer is made of PETG or PET, and a degradation layer is sandwiched between the impact-resistant layer and the core layer.

5. The recyclable PETG decorative film according to claim 4, characterized in that: The degradation layer contains a copolymer of polylactic acid and itaconic acid.

6. The recyclable PETG decorative film according to claim 1, characterized in that: A repair coating is provided on the surface of the impact-resistant layer away from the core layer, and the repair coating is the surface layer of the decorative film.

7. The recyclable PETG decorative film according to claim 6, characterized in that: The material of the repair coating is polyurethane coating.

8. The recyclable PETG decorative film according to claim 2 or 4, characterized in that: The thickness of the impact-resistant layer accounts for 5% to 15% of the total thickness of the decorative film.

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