A mesh-coated TPU film and its preparation method

Abstract

This application relates to the field of composite materials, and more specifically, to a mesh-coated TPU film and its preparation method. The TPU film is prepared by: melting and extruding TPU particles and calendering to form a TPU film; mesh pretreatment by pulverizing the TPU film to obtain TPU microparticles; spraying the TPU microparticles into the mesh, filling the mesh openings, and heating to melt the TPU microparticles to obtain a pretreated mesh; attaching the TPU film to at least one side of the pretreated mesh and hot-pressing to obtain the mesh-coated TPU film. By pulverizing the TPU film into TPU microparticles and spraying them into the mesh, allowing the TPU microparticles to fill the mesh openings, and by melting the TPU microparticles during heating and tightly bonding them to the mesh, the adhesion stability between the mesh and the TPU film is effectively improved, avoiding problems such as weak adhesion and cracking that easily occur in traditional methods.

Description

Technical Field

[0001] This application relates to the field of composite materials, and more specifically, to a mesh-woven composite TPU film and its preparation method. Background Technology

[0002] TPU film, as a high-performance material, has wide applications in the automotive and electronics industries. By combining it with mesh fabric, its physical properties, such as abrasion resistance, tear resistance, and flexibility, can be significantly improved. This composite material not only meets the demands of the high-end market but also maintains excellent performance under various harsh environments. However, with the continuous growth of market demand and the requirements of technological advancements, effectively improving the adhesion stability of the composite material has become one of the key issues that urgently needs to be addressed.

[0003] Currently, common methods for achieving effective lamination of TPU film and mesh fabric include direct bonding, adhesive bonding, and thermoforming. Direct bonding simply involves attaching the TPU film and mesh fabric together; it's easy to operate but has relatively low adhesion strength. Adhesive bonding uses specialized adhesives to fix the two together; while it offers stronger adhesion, it suffers from high cost and poor environmental friendliness. Thermoforming combines the TPU film and mesh fabric under specific temperature and pressure conditions; although it achieves good adhesion, uneven adhesion and interface separation are still difficult to completely avoid in practice.

[0004] These existing composite methods generally suffer from unstable adhesion, leading to cracking and peeling of the composite materials during use, which seriously affects their overall performance and service life. This problem is particularly prominent in applications such as automotive interior parts and tires, urgently requiring a more reliable and stable composite technology to solve these issues. Summary of the Invention

[0005] In order to reduce cracking, peeling and other phenomena, and to further improve the physical properties of the mesh-coated TPU film, this application provides a mesh-coated TPU film and its preparation method.

[0006] In the first aspect, a method for preparing a mesh-woven composite TPU film is provided, which is obtained by the following method: TPU film: TPU particles are melt-extruded and calendered to form a TPU film;

[0007] Pre-treatment of mesh fabric: TPU film is crushed to obtain TPU microparticles; then the TPU microparticles are sprayed into the mesh fabric and filled into the mesh openings of the mesh fabric; the TPU microparticles are heated to melt them to obtain pre-treated mesh fabric.

[0008] A TPU film is attached to at least one side of the pretreated mesh fabric and then hot-pressed to obtain a mesh fabric composite TPU film.

[0009] This method significantly improves the adhesion stability between the TPU film and the mesh fabric. First, the TPU film is pulverized to obtain TPU microparticles, which are then sprayed into the mesh fabric, filling the mesh openings. Upon heating, the TPU microparticles melt, forming a stable pre-treated mesh fabric. This pre-treatment method not only enhances the physical properties of the mesh fabric but also improves the bonding strength between the TPU film and the mesh fabric. Finally, a TPU film is attached to at least one side of the pre-treated mesh fabric and hot-pressed, ensuring a tight bond between the TPU film and the mesh fabric. This effectively avoids the adhesion instability and cracking problems that may occur in traditional methods, improving overall practicality, reliability, and physical properties.

[0010] Preferably, the hot pressing temperature is 130-150℃, the hot pressing pressure is 10-30kg, and the hot pressing time is 0.2-3s.

[0011] The hot-pressing temperature is 130-150℃, the hot-pressing pressure is 10-30kg, and the hot-pressing time is 0.2-3s. This ensures full fusion between the TPU film and the pre-treated mesh, improves the adhesion strength and stability of the two, avoids the problem of unstable adhesion in traditional methods, reduces the risk of cracking of composite materials during use, and improves the overall performance and service life of the product.

[0012] Preferably, the basis weight of the TPU film is 120-2000 g / m³. 2 .

[0013] 120-2000g / m 2 The TPU film can be selected according to different application scenarios, enhancing the product's applicability and flexibility. The preferred TPU film thickness is controlled within a basis weight of 180-320 g / m². 2 Within the specified range, sufficient mechanical strength can be guaranteed, which, combined with the process of this application, results in better physical properties of the mesh-woven composite TPU film.

[0014] Preferably, the TPU particles are modified TPU particles, which are obtained from the following raw materials by weight percentage:

[0015] TPU: 60-80%

[0016] Catalyst: 0.1-0.3%

[0017] Bismaleimide derivatives: 3-8%

[0018] Polyethylene glycol derivatives: 2.7-5.2%

[0019] The remainder is filler.

[0020] Modified TPU particles can significantly improve the adhesion between TPU film and mesh fabric, making the overall performance of the composite material more stable, avoiding problems such as cracking during use, and improving practicality and durability.

[0021] A TPU content of 60-80% provides basic mechanical strength and elasticity, ensuring the fundamental properties of the composite material. The catalyst accelerates the chemical reaction, contributing to the uniform dispersion and melting of TPU particles and improving processing performance. It also promotes further reaction of the bismaleimide derivative, thereby enhancing the adhesion properties of the TPU. Combined with the compatibilizing, compatibility, and dispersing effects of the polyethylene glycol derivative, and the synergistic effect of the bismaleimide derivative, the bonding force between the modified TPU and the mesh fabric is strengthened, reducing the risk of delamination. Furthermore, it promotes thorough mixing of TPU and fillers, improving physical properties and further enhancing the uniformity and stability of the mesh-composite TPU film, resulting in superior durability.

[0022] Preferably, the maleimide derivative is bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and / or N,N'-(4-methyl-1,3-phenylene)bismaleimide.

[0023] Maleimide derivatives are bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and / or N,N'-(4-methyl-1,3-phenylene)bismaleimide, which can effectively improve the adhesion and material properties of TPU particles, making the bond between TPU film and mesh fabric stronger, reducing cracking and other phenomena in composite materials during use, and significantly improving the overall performance and practicality of composite materials.

[0024] Preferably, the maleimide derivative is composed of bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and N,N'-(4-methyl-1,3-phenylene)bismaleimide in a weight ratio of 1:(1.5-3.2).

[0025] The addition of bismaleimide derivatives and polyethylene glycol derivatives effectively improves the adhesion and material properties of TPU materials. The bismaleimide derivatives can chemically react with the TPU molecular chains, increasing the cross-linking density between molecules, thereby enhancing the adhesion between TPU and the mesh fabric.

[0026] A specific ratio of maleimide derivatives, which consist of bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and N,N'-(4-methyl-1,3-phenylene)bismaleimide in a weight ratio of 1:(1.5-3.2), is chosen to ensure adhesion performance while maintaining the mechanical strength and flexibility of the TPU material and avoiding brittleness caused by excessive cross-linking.

[0027] In summary, the above technical solutions significantly improve the adhesion between the TPU film and the mesh fabric, enhance the overall stability of the composite material, reduce potential cracking issues during use, and improve the practicality and durability of the product.

[0028] Preferably, the polyethylene glycol derivative is PEG-40 hydrogenated castor oil and / or polyethylene glycol diacrylate.

[0029] By adopting the above technical solution, the polyethylene glycol derivatives are PEG-40 hydrogenated castor oil and / or polyethylene glycol diacrylate, which can effectively increase compatibility, promote compatibility and dispersion, making the TPU particles more uniform during the melting process, improving the mechanical properties and adhesion of the TPU film, and thus enhancing the overall performance and stability of the mesh-coated TPU film.

[0030] Preferably, the filler is composed of one or more of silica, graphite, calcium carbonate, and glass fiber.

[0031] The above solutions, employing the aforementioned technical methods, utilize fillers composed of one or more of the following: silica, graphite, calcium carbonate, and glass fiber. These solutions significantly improve the mechanical strength and durability of TPU films, enhancing the overall performance of the composite material. Specifically:

[0032] When silica, white graphite, and glass fiber are used together, silica has a good reinforcing effect, which can effectively improve the tensile strength and tear strength of TPU film.

[0033] White graphite can improve the thermal conductivity of TPU films, which helps dissipate heat and reduces performance degradation caused by high temperatures.

[0034] Calcium carbonate, as a filler, can reduce costs while increasing the hardness and rigidity of TPU films.

[0035] Glass fiber has excellent mechanical properties and dimensional stability, which can significantly improve the impact resistance and abrasion resistance of TPU film.

[0036] The combined use of the above fillers results in a final TPU mesh composite film that exhibits superior physical properties and a longer service life in practical applications.

[0037] Preferably, the TPU microparticles have a particle size of 1000-2000 mesh and a melting temperature of 160-170℃.

[0038] The above-described solution uses TPU microparticles with a particle size of 1000-2000 mesh, ensuring uniform distribution and full penetration into the mesh of the fabric. This enhances the adhesion between the fabric and the TPU film, improving the overall strength and stability of the composite material. Simultaneously, the TPU microparticles' melting temperature of 160-170℃ allows for rapid melting and tight bonding with the fabric during subsequent hot pressing, avoiding cracking issues caused by unstable adhesion in traditional processes. This significantly improves the product's practicality and durability.

[0039] Secondly, a mesh-coated TPU film includes a mesh and at least one TPU film layer, wherein the mesh openings of the mesh are filled with TPU material, and the TPU film layer is stably connected to the TPU material and the mesh lines of the mesh. The mesh-coated TPU film is prepared by a method for preparing a mesh-coated TPU film.

[0040] The mesh-coated TPU film has the following effects:

[0041] Enhanced adhesion stability: By spraying TPU microparticles into the mesh of the fabric and allowing them to penetrate, followed by heating to melt the TPU microparticles, the adhesion between the fabric and the TPU film is made stronger, avoiding the adhesion instability problem caused by traditional direct bonding methods, and improving the overall performance and durability of the composite material.

[0042] Improved physical properties: The use of modified TPU particles, especially the addition of bismaleimide derivatives and polyethylene glycol derivatives, significantly improves the adhesion and material properties of TPU films, resulting in composite materials with better mechanical strength and chemical resistance.

[0043] Optimized manufacturing process: By controlling the hot pressing temperature, pressure and time, a good bond between the TPU film and the mesh was ensured, while the uniformity and consistency of the composite material were guaranteed, simplifying the production process and reducing production costs.

[0044] Enhancing functionality: The selection of fillers, such as silica, graphite, calcium carbonate, and glass fiber, not only improves the mechanical properties of composite materials but also endows them with more functional properties, such as electrical conductivity, thermal insulation, and wear resistance.

[0045] Precise control of particle size and melting point: The particle size of TPU microparticles is controlled within the range of 1000-2000 mesh, and the melting temperature is set at 160-170℃. This ensures that the TPU microparticles can effectively penetrate into the mesh of the fabric and melt under suitable conditions, further enhancing the structural stability of the composite material.

[0046] In summary, this application includes at least one of the following beneficial technical effects:

[0047] 1. By crushing the TPU film into TPU microparticles and spraying them into the mesh, the TPU microparticles fill the mesh openings of the mesh. During the heating process, the TPU microparticles melt and bond tightly with the mesh, which effectively improves the adhesion stability between the mesh and the TPU film and avoids problems such as weak adhesion and cracking that are common in traditional methods.

[0048] 2. The bismaleimide derivative and polyethylene glycol derivative in the modified TPU particles significantly improve the adhesion and material properties of the TPU material, resulting in a final composite material with better mechanical strength and durability, making it suitable for applications requiring high strength.

[0049] 3. By controlling hot-pressing parameters (such as temperature, pressure, and time), the bonding between the TPU film and the pre-treated mesh is ensured to be more uniform and tight, further enhancing the overall performance of the composite material and extending its service life. Detailed Implementation

[0050] The following examples will provide a more detailed description of this application.

[0051] Introduction to some raw materials:

[0052] TPU: Covestro TPU 285 (Germany);

[0053] Catalyst: Vanadium isooctanoate;

[0054] PEG-40 hydrogenated castor oil: preferably CO-40 from Jining Tangyi Chemical Co., Ltd.;

[0055] Polyethylene glycol diacrylate has a viscosity-average molecular weight of 600-700.

[0056] The molecular structure of N,N'-(4-methyl-1,3-phenylene)bismaleimide is as follows:

[0057]

[0058] The molecular structure of bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane is as follows:

[0059]

[0060] The particle size of silica, white graphite, and calcium carbonate is 1000 mesh.

[0061] Glass fiber is a short glass fiber with a diameter of 10-20 micrometers and a length of 30-50 micrometers;

[0062] In the embodiments of this application, the preferred basis weight range of the TPU film is 180-320 g / m³. 2 When applied to large tire treads, its weight can reach 1000-2000 g / m².2 The particle size of the TPU microparticles is 800-4000 mesh, preferably 1000-2000 mesh in the examples; the melting temperature of the TPU microparticles is 150-200℃, preferably 160-170℃ in the examples; the hot pressing temperature is 130-180℃, preferably 130-150℃ in the examples.

[0063] Preparation example of modified TPU particles

[0064] Preparation Example 1

[0065] A modified TPU particle is prepared by the following method:

[0066] Weigh out 75% TPU, 0.5% catalyst, 8% bismaleimide derivative, 5.2% polyethylene glycol derivative, and 11.2% filler by weight and place them in a mixing device. Stir at 200 r / min for 10 min to ensure thorough mixing and obtain mixture A. Heat mixture A to 170℃ to completely melt it, then stir for 5 min to ensure thorough mixing and then place the material into an extruder for extrusion. The extruded material is then cooled to 30℃ in a cooling device and then granulated in a granulator. The resulting granules are then baked in an oven at 80℃ for 10 min to obtain modified TPU granules.

[0067] Among them, the maleimide derivative is N,N'-(4-methyl-1,3-phenylene)bismaleimide; the polyethylene glycol derivative is PEG-40 hydrogenated castor oil; and the filler is silica.

[0068] Preparation Examples 2-3

[0069] The difference between Preparation Example 2-2 and Preparation Example 1 is that the amount of raw materials used is different, as shown in Table 1.

[0070] Table 1. Raw material usage (%) for Preparation Examples 1-3

[0071]

[0072] Preparation Example 4

[0073] The difference between Preparation Example 4 and Preparation Example 2 is that the maleimide derivative is bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane.

[0074] Preparation Example 5

[0075] The difference between Preparation Example 5 and Preparation Example 2 is that the maleimide derivative is prepared by bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and N,N'-(4-methyl-1,3-phenylene)bismaleimide in a weight ratio of 1:1.5.

[0076] Preparation Example 6

[0077] The difference between Preparation Example 6 and Preparation Example 2 is that the maleimide derivative is prepared by bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and N,N'-(4-methyl-1,3-phenylene)bismaleimide in a weight ratio of 1:2.2.

[0078] Preparation Example 7

[0079] The difference between Preparation Example 7 and Preparation Example 2 and Preparation Example 1 is that the maleimide derivative is prepared by bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and N,N'-(4-methyl-1,3-phenylene)bismaleimide in a weight ratio of 1:3.2.

[0080] Preparation Example 8

[0081] The difference between Preparation Example 8 and Preparation Example 6 is that the polyethylene glycol derivative is polyethylene glycol diacrylate.

[0082] Preparation Example 9

[0083] The difference between Preparation Example 9 and Preparation Example 6 is that the polyethylene glycol derivative is composed of PEG-40 hydrogenated castor oil and polyethylene glycol diacrylate in a weight ratio of 1:0.3.

[0084] Preparation Example 10

[0085] The difference between Preparation Example 10 and Preparation Example 9 is that the filler is white graphite.

[0086] Preparation Example 11

[0087] The difference between Preparation Example 11 and Preparation Example 9 is that the filler is composed of calcium carbonate and glass fiber in a weight ratio of 1:0.1.

[0088] Preparation Example 12

[0089] The difference between Preparation Example 12 and Preparation Example 9 is that the filler is composed of silica, white graphite and glass fiber in a weight ratio of 1:0.1:0.3.

[0090] Preparation of comparative examples

[0091] Preparation of Comparative Example 1

[0092] The difference between Comparative Example 1 and Preparation Example 1 is that the bismaleimide derivative was replaced with an equal amount of TPU.

[0093] Preparation of Comparative Example 2

[0094] The difference between Comparative Example 2 and Preparation Example 2 is that the polyethylene glycol derivative was replaced with an equal amount of TPU.

[0095] Example

[0096] Example 1

[0097] A mesh-coated TPU film comprises a mesh fabric and at least one TPU film layer. Preferably, two TPU film layers are disposed on opposite sides of the mesh fabric. The mesh openings of the mesh fabric are filled with TPU material. Each TPU film layer is stably connected to the TPU material and the mesh fibers of the mesh fabric, resulting in a structurally stable mesh-coated TPU film.

[0098] The mesh-coated TPU film is prepared by the following method:

[0099] TPU film: TPU granules are melt-extruded in a twin-screw extruder and then calendered in a calender to form a TPU film;

[0100] Pretreatment of the mesh fabric: The TPU film is crushed to obtain TPU microparticles; the TPU microparticles are then sprayed into the mesh fabric and filled into the mesh openings. The mesh fabric is heated to 160°C for 2 minutes to allow the TPU microparticles to slightly melt, thus obtaining the pretreated mesh fabric.

[0101] TPU films are attached to both sides of the pre-treated mesh fabric, and then hot-pressed to obtain a mesh fabric composite TPU film. The basis weight of the TPU material is 60% of the basis weight of the mesh fabric.

[0102] The mesh fabric is made of nylon cord fabric, which is woven from warp and weft threads. Both warp and weft threads are made of nylon 66 thread with a diameter of 0.2mm. The radial thread density is 40 threads / 5cm, and the weft thread density is 40 threads / 5cm.

[0103] The weight of each TPU film layer is 180g / m². 2 The hot pressing temperature is 130℃, the hot pressing pressure is 30kg, and the hot pressing time is 3s.

[0104] The TPU microparticles have a particle size of 1000 mesh and a melting temperature of 170℃.

[0105] Example 2

[0106] The difference between Example 2 and Example 1 lies in the process parameters, as detailed below:

[0107] The weight of each TPU film layer is 260g / m³. 2 The hot-pressing temperature is 140℃, the hot-pressing pressure is 20kg, and the hot-pressing time is 1.5s.

[0108] The TPU microparticles have a particle size of 1500 mesh and a melting temperature of 160℃.

[0109] Example 3

[0110] The difference between Example 3 and Example 1 lies in the process parameters, as detailed below:

[0111] The weight of each TPU film layer is 320g / m³. 2 The hot pressing temperature is 150℃, the hot pressing pressure is 10kg, and the hot pressing time is 0.2s.

[0112] The TPU microparticles have a particle size of 2000 mesh and a melting temperature of 160℃.

[0113] Example 4-17

[0114] The difference between Examples 4-17 and Example 2 is that the TPU is a modified TPU, as shown in Table 2.

[0115] Table 2 Sources of modified TPU in Examples 4-17

[0116]

[0117]

[0118] Comparative Example

[0119] Comparative Example 1

[0120] The difference between Comparative Example 1 and Example 1 is that there is no TPU material inside the mesh. The specific process is as follows: TPU film: TPU particles are put into a twin-screw extruder for melt extrusion, and then calendered in a calender to form a TPU film;

[0121] TPU film is attached to both sides of the mesh fabric and then hot-pressed to obtain a mesh fabric composite TPU film.

[0122] The TPU membrane weight of each layer is 180g / m³. 2 +1 / 2 TPU material weight.

[0123] Performance testing

[0124] Detection methods / test methods

[0125] The mesh-composite TPU films obtained in Examples 1-17 and Comparative Example 1 were subjected to the following performance tests:

[0126] Peel strength test: Referring to GB / T 2792-1998, one side of the fabric-composite TPU film is completely fixed, and a 1mm slit is made on the other side with a knife to separate the TPU film layer from the mesh fabric. Then, the force required to peel off the TPU film layer is tested. The above test is performed 3 times and the average value is taken.

[0127] Tensile strength: The tensile strength of the microfiber fabrics obtained in Examples 1-17 and Comparative Example 1 was tested in accordance with GB / T3923.1-1997.

[0128] The experimental data are detailed in Table 3;

[0129] Table 3 Experimental data of Examples 1-17 and Comparative Example 1

[0130]

[0131]

[0132] Based on Example 1 and Comparative Example 1, and referring to Table 3, it can be seen that the peel force of Example 1 is 1.54 kg higher than that of Comparative Example 1, and the tensile strength of Example 1 is 4.7 kg higher than that of Comparative Example 1. This indicates that the preparation process of this application can enable the layer structure of the mesh composite TPU film to obtain better stability, reduce the occurrence of cracking, and also have better tensile strength, reducing the possibility of damage.

[0133] Combining Examples 2 and 4 with Table 3, it can be seen that the peel force and tensile strength of Example 1 are greater than those of Example 2. This indicates that the modified TPU obtained by the preparation method of this application has a better adhesion effect, stabilizes the layer structure connection of the mesh composite TPU film, and has better physical properties, thus improving the practicality of the mesh composite TPU film.

[0134] Comparing Examples 5 and 8-10, and referring to Tables 2-3, it can be seen that the peel strength and tensile strength of the mesh composite film obtained by Examples 8-10 using Preparation Examples 5-7 are higher than those of Example 5. This indicates that the combination of bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and N,N'-(4-methyl-1,3-phenylene)bismaleimide has a synergistic effect, further enhancing the overall performance of the mesh composite film.

[0135] Comparing Examples 16-17 and Example 4, and referring to Tables 2-3, it can be seen that the peel force and tensile strength of Examples 16-17 are lower than those of Example 4. This indicates that the present application further enhances the comprehensive performance of the mesh-woven composite TPU film by compounding bismaleimide derivatives and polyethylene glycol derivatives and modifying TPU.

[0136] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing a mesh-woven composite TPU film, characterized in that, It is prepared by the following method: TPU film: TPU particles are melt-extruded and calendered to form a TPU film; Pre-treatment of the mesh: The TPU film is crushed to obtain TPU microparticles; TPU microparticles are then sprayed onto the mesh fabric, filling the mesh openings. The TPU microparticles are then heated to melt, resulting in a pre-treated mesh fabric. A TPU film is attached to at least one side of a pre-treated mesh fabric and then hot-pressed to obtain a mesh fabric composite TPU film. The hot-pressing temperature is 130-180℃, the hot-pressing pressure is 10-30kg, and the hot-pressing time is 0.2-3s; The TPU microparticles have a particle size of 800-4000 mesh and a melting temperature of 150-200℃. The TPU particles are modified TPU particles, which are obtained from the following raw materials by weight percentage: TPU: 75-90% Catalyst: 0.1-0.5% Bismaleimide derivatives: 3-8% Polyethylene glycol derivatives: 2.7-5.2% The remainder is filler material; The polyethylene glycol derivative is PEG-40 hydrogenated castor oil and / or polyethylene glycol diacrylate; The maleimide derivative is bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and / or N,N'-(4-methyl-1,3-phenylene)bismaleimide; The filler is composed of one or more of the following: silica, graphite, calcium carbonate, and glass fiber.

2. The method for preparing a mesh-woven composite TPU film according to claim 1, characterized in that: The TPU film has a basis weight of 120-2000 g / m³. 2 .

3. The method for preparing a mesh-woven composite TPU film according to claim 1, characterized in that: The maleimide derivative is composed of bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane and N,N'-(4-methyl-1,3-phenylene)bismaleimide in a weight ratio of 1:(1.5-3.2).

4. A mesh-woven composite TPU film, characterized in that: The invention comprises a mesh fabric and at least one TPU film layer, wherein the mesh openings of the mesh fabric are filled with TPU material, and the TPU film layer is stably connected to the TPU material and the warp and weft threads of the mesh fabric, as described in any one of claims 1-3, for the preparation of a mesh fabric composite TPU film.

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