Abrasion-resistant ultraviolet shielding PET adhesive film

Abstract

The utility model relates to PET adhesive film technical field, concretely is a kind of wear-resistant ultraviolet shielding PET adhesive film, including PET base material layer, ultraviolet shielding layer and wear layer.PET base material layer provides basic support, with excellent mechanical strength and transparency, ultraviolet shielding layer is constituted by the uniform dispersion of nanometer TiO2 Particle in transparent resin, effectively blocks UVA and UVB ray, prevents the damage of ultraviolet to internal structure, the layer is attached on PET base material by bonding promotion layer, ensure good interface bonding force, wear layer uses nanometer diamond particle, these particles form a layer of firm and dense protective film on surface, significantly improve the wear resistance and durability of adhesive film, nanometer diamond not only high hardness, also have good thermal conductivity and chemical inertia, further enhance the overall performance of adhesive film.

Description

Technical Field

[0001] This utility model relates to the field of PET film technology, specifically to a wear-resistant ultraviolet-shielding PET film. Background Technology

[0002] With technological advancements and growing industrial demands, polyethylene terephthalate (PET) has become a core material in fields such as electronic display devices, optical films, and food packaging due to its excellent mechanical strength, high transparency, chemical resistance, and lightweight properties. However, in outdoor applications (such as solar panel encapsulation, building facade decoration, and automotive window film), PET materials are exposed to ultraviolet (UV) radiation and mechanical friction for extended periods, gradually revealing their performance deficiencies.

[0003] UV-induced degradation problem

[0004] Photo-oxidation mechanism: The energy of ultraviolet light (wavelength 280-400nm) (3.1-4.4eV) is close to the C=O bond energy (~3.6eV) in the PET molecular chain, which leads to chain breakage and free radical generation, causing yellowing and embrittlement of the material.

[0005] The shortcomings of traditional shielding technology:

[0006] Organic UV absorbers (such as benzotriazoles): are prone to migration and volatilization, and have poor compatibility with PET, leading to interfacial delamination.

[0007] Inorganic micron-sized particles (such as TiO2 powder): excessively large particle size causes Rayleigh scattering, significantly reducing light transmittance and resulting in low shielding efficiency.

[0008] Functional failure due to mechanical wear

[0009] Insufficient surface hardness: The Mohs hardness of ordinary PET surfaces is only 2-3H. Long-term friction from sand, wind, and other sources can easily cause scratches and damage optical uniformity.

[0010] Defects of wear-resistant coating technology:

[0011] Micron-sized wear-resistant particles (such as Al2O3 and SiO2): Large particle size leads to high porosity in the coating, reducing wear resistance.

[0012] Weak organic-inorganic interface bonding: The large difference in interfacial energy between inorganic particles and PET substrate, and the mismatch in thermal expansion coefficients, easily lead to microcracks.

[0013] Stability challenges of multilayer composite structures

[0014] Insufficient interlayer adhesion: Traditional composite films combine functional layers through physical adsorption or simple coating processes, resulting in weak interfacial adhesion and easy delamination failure after humid heat aging. Utility Model Content

[0015] (a) Technical problems to be solved

[0016] To address the shortcomings of existing technologies, this invention provides a wear-resistant, UV-shielding PET film.

[0017] (II) Technical Solution

[0018] To achieve the above objectives, this utility model provides the following technical solution: A wear-resistant ultraviolet-shielding PET film of this utility model, comprising:

[0019] PET substrate layer;

[0020] An ultraviolet shielding layer disposed on at least one side of the PET substrate layer, wherein the ultraviolet shielding layer is an ultraviolet absorber;

[0021] A wear-resistant layer covering the ultraviolet shielding layer, wherein the wear-resistant layer is composed of nanodiamond particles.

[0022] Preferably, the ultraviolet absorber is nano-sized TiO2 particles with a particle size range of 50-100 nm.

[0023] More preferably, the particle size of the nanodiamond particles is 5-10 nm.

[0024] Preferably, the ultraviolet shielding layer and the wear-resistant layer include a bonding promoting layer, wherein the nano-sized TiO2 particles cover the bonding promoting layer of the ultraviolet shielding layer, the bonding promoting layer of the wear-resistant layer covers the ultraviolet shielding layer, and the nano-diamond particles cover the bonding promoting layer of the wear-resistant layer.

[0025] Preferably, the bonding promoting layer is a transparent resin adhesive, which is any one of acrylic resin adhesive, polyurethane resin adhesive or epoxy resin adhesive.

[0026] More preferably, the surface of the adhesion promoting layer is coated with a silane coupling agent.

[0027] Preferably, the PET bonding promoting layer has a thickness of 50 μm to 200 μm, the ultraviolet shielding layer has a thickness of 5 μm to 20 μm, and the wear-resistant layer has a thickness of 2 μm to 10 μm.

[0028] (III) Beneficial Effects

[0029] Compared with the prior art, this utility model provides a wear-resistant ultraviolet-shielding PET film, which has the following beneficial effects:

[0030] Through innovative multi-layer structural design, the overall performance and application range of the material are significantly improved. The PET substrate layer provides excellent mechanical strength and stability, ensuring the basic support function of the film.

[0031] The UV shielding layer uses nano-sized TiO2 particles (50-100nm in diameter) uniformly dispersed in transparent resin to effectively block UVA and UVB rays, preventing UV damage to the internal structure. This highly efficient UV absorber not only enhances the protective effect but also maintains high light transmittance, making it suitable for applications requiring high transparency.

[0032] The wear-resistant layer is composed of nanodiamond particles (5-10 nm in diameter). These particles form a robust and dense protective film on the surface, greatly improving the wear resistance and durability of the adhesive film. The high hardness and good thermal conductivity of nanodiamonds further enhance the overall performance of the adhesive film, enabling it to work stably for a long time in harsh environments.

[0033] The presence of an adhesion-promoting layer ensures a tight bond between the layers, preventing delamination. This layer uses acrylic, polyurethane, or epoxy resin adhesives and is coated with a silane coupling agent, significantly improving interfacial adhesion and overall structural stability. Optimized thickness (50μm to 200μm for the PET substrate layer, 5μm to 20μm for the UV shielding layer, and 2μm to 10μm for the abrasion-resistant layer) ensures optimal performance.

[0034] In summary, this wear-resistant UV-shielding PET film, through its unique multi-layered structural design, not only provides excellent UV shielding capabilities and wear resistance, but also possesses superior transparency and durability. It is suitable for various outdoor and industrial applications, such as solar panel encapsulation materials and architectural decoration, and has broad application prospects and technological advantages. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the disassembled structure of this utility model;

[0036] Figure 2 This is a schematic diagram of the bonding of each layer in this utility model;

[0037] In the diagram: 1. PET substrate layer; 2. UV shielding layer; 3. Abrasion resistant layer; 4. Adhesion promoting layer. Detailed Implementation

[0038] 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.

[0039] Please see Figures 1-2 The present invention relates to a wear-resistant ultraviolet-shielding PET film, comprising:

[0040] PET substrate layer 1;

[0041] An ultraviolet shielding layer 2 is disposed on at least one side of the PET substrate layer 1, wherein the ultraviolet shielding layer 2 is an ultraviolet absorber;

[0042] A wear-resistant layer 3 is applied over the ultraviolet shielding layer 2, and the wear-resistant layer 3 is composed of nanodiamond particles.

[0043] PET substrate layer 1

[0044] Function: As a supporting substrate, it provides mechanical strength (tensile strength ≥150MPa) and light transmittance (light transmittance ≥90%).

[0045] Principle: The molecular chains of PET (polyethylene terephthalate) are arranged in a regular manner, forming a highly crystalline structure, which gives the material high modulus and weather resistance.

[0046] UV shielding layer 2

[0047] Function: Absorbs or reflects ultraviolet rays (280-400nm) to protect the substrate and underlying structure from photodegradation.

[0048] Principle: Nano-TiO2 particles absorb ultraviolet photons through electronic transitions. Their band gap (3.2 eV) matches the energy of ultraviolet light, achieving efficient shielding (ultraviolet blocking rate ≥99%).

[0049] Wear-resistant layer 3

[0050] Function: Improves surface hardness (Mohs hardness ≥ 8) and scratch resistance, and extends the service life of the adhesive film.

[0051] Principle: Nanodiamond particles (5-10nm) are covalently embedded in the resin matrix to form a dense, wear-resistant network, reducing the coefficient of friction (≤0.15).

[0052] Adhesion promoting layer 4 and silane coupling agent

[0053] Function: Enhances interlayer bonding (peel strength ≥8N / cm) and prevents delamination.

[0054] principle:

[0055] Transparent adhesive layers such as acrylic resins form hydrogen bonds with the PET substrate through polar groups (-OH, -COOH);

[0056] Silane coupling agents (such as KH-570) generate silanol bonds after hydrolysis, which chemically bond with nanoparticles and substrate surfaces, improving interfacial adhesion.

[0057] Preferred technical solutions and working principles

[0058] Composite layer structure design

[0059] Structure: PET substrate layer 1 (50-200μm) → UV shielding layer 2 (5-20μm) → Abrasion resistant layer 3 (2-10μm).

[0060] Working principle:

[0061] Thickness synergy: A substrate layer that is too thin (<50μm) is prone to insufficient mechanical strength, while a substrate layer that is too thick (>200μm) reduces flexibility;

[0062] Functional layering: The ultraviolet shielding layer 2 and the wear-resistant layer 3 are set independently to avoid the agglomeration of nanoparticles that leads to a decrease in light transmittance (light transmittance loss ≤3%).

[0063] Nanoparticle selection and dispersion

[0064] Preferred parameters:

[0065] Ultraviolet absorber: Nano-TiO2 (50-100nm), with a SiO2 layer coated on the surface (to prevent photocatalytic activity);

[0066] Wear-resistant particles: nano-diamonds (5-10nm), amino-modified to improve resin compatibility.

[0067] Working principle:

[0068] Particle size matching: TiO2 particles with a diameter >50nm can reduce Rayleigh scattering and maintain high light transmittance;

[0069] Surface modification: The amino groups react with the carboxyl groups of the acrylic resin to form a chemical cross-linking network.

[0070] Optimization of Adhesion Promotion Layer 4

[0071] Material selection:

[0072] Transparent resin adhesives: acrylic resin (excellent weather resistance), polyurethane (excellent flexibility), epoxy resin (excellent strength);

[0073] Silane coupling agents: KH-550 (enhances inorganic-organic interfaces), KH-570 (improves water resistance).

[0074] Working principle:

[0075] Gradient curing: UV-cured acrylic resin (energy 1000-1500 mJ / cm) 2 Initial tack is formed, and heat curing (80℃×30min) strengthens cross-linking;

[0076] Directional alignment of coupling agents: silane coupling agents self-assemble into a monolayer on the resin surface, reducing interfacial energy (≤25mN / m).

[0077] Detailed Workflow

[0078] Prepare PET substrate layer 1:

[0079] Select a PET substrate of appropriate thickness (50μm to 200μm) and pre-treat it to ensure that the surface is clean and free of impurities.

[0080] Apply adhesion promoting layer 4:

[0081] A layer of transparent resin adhesive (such as acrylic resin adhesive) is uniformly coated on a PET substrate, and a silane coupling agent is added to enhance adhesion.

[0082] Preparation of ultraviolet shielding layer 2:

[0083] Nanoscale TiO2 particles (50-100nm in diameter) are uniformly dispersed in a transparent resin to form an ultraviolet shielding layer 2, which is then coated onto an adhesion promoting layer 4, ensuring a thickness between 5μm and 20μm.

[0084] Apply a second bonding-promoting layer 4:

[0085] A new layer of transparent resin adhesive is coated on top of the ultraviolet shielding layer 2, and a silane coupling agent is added to form a new adhesion promoting layer 4.

[0086] Preparation of wear-resistant layer 3:

[0087] Nanodiamond particles (5-10 nm in diameter) are uniformly dispersed in a transparent resin to form a wear-resistant layer 3, which is then coated onto a second bonding-promoting layer 4, ensuring a thickness between 2 μm and 10 μm.

[0088] Curing process:

[0089] The entire composite structure is cured to fully cross-link the layers, forming a robust overall structure.

[0090] Quality Inspection:

[0091] Various performance tests are conducted on the finished product, including UV shielding effect, abrasion resistance, and light transmittance, to ensure that it meets the design requirements.

[0092] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant ultraviolet shielding PET adhesive film, characterized in that, include: PET substrate layer (1); An ultraviolet shielding layer (2) is disposed on at least one side of the PET substrate layer (1), wherein the ultraviolet shielding layer (2) is an ultraviolet absorber; A wear-resistant layer (3) is applied over the ultraviolet shielding layer (2), and the wear-resistant layer (3) is composed of nanodiamond particles.

2. The wear-resistant ultraviolet shielding PET adhesive film according to claim 1, characterized in that, The ultraviolet absorber is nano-sized TiO2 particles with a particle size range of 50-100 nm.

3. The wear-resistant ultraviolet shielding PET adhesive film according to claim 1, characterized in that, The nanodiamond particles have a particle size of 5-10 nm.

4. The wear-resistant ultraviolet shielding PET adhesive film according to claim 2, characterized in that, The ultraviolet shielding layer (2) and the wear-resistant layer (3) include a bonding promoting layer (4), the nano-sized TiO2 particles are covered on the bonding promoting layer (4) of the ultraviolet shielding layer (2), the bonding promoting layer (4) of the wear-resistant layer (3) is covered on the ultraviolet shielding layer (2), and the nano-diamond particles are covered on the bonding promoting layer (4) of the wear-resistant layer (3).

5. The wear-resistant ultraviolet shielding PET adhesive film according to claim 4, characterized in that, The bonding promoting layer (4) is a transparent resin adhesive, which can be any one of acrylic resin adhesive, polyurethane resin adhesive or epoxy resin adhesive.

6. The wear-resistant ultraviolet shielding PET adhesive film according to claim 4, characterized in that, The surface of the adhesion promoting layer (4) is coated with a silane coupling agent.

7. The wear-resistant ultraviolet shielding PET adhesive film according to claim 1, characterized in that, The PET bonding promoting layer (4) has a thickness of 50 μm to 200 μm, the ultraviolet shielding layer (2) has a thickness of 5 μm to 20 μm, and the wear-resistant layer (3) has a thickness of 2 μm to 10 μm.

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