Environment-friendly recyclable TPU (thermoplastic polyurethane) film

Abstract

The utility model provides an environment-friendly recyclable TPU (thermoplastic polyurethane) film which comprises a TPU base film, a first antibacterial layer and a second antibacterial layer are respectively arranged on the upper surface and the lower surface of the TPU base film, an anti-oxidation layer is arranged on the upper surface of the first antibacterial layer, an anti-aging layer is arranged on the lower surface of the second antibacterial layer, and a waterproof oil stain layer is arranged on the upper surface of the anti-oxidation layer. Compared with the prior art, the first antibacterial layer and the second antibacterial layer are arranged on the upper surface and the lower surface of the TPU base film respectively, the anti-oxidation layer is arranged on the upper surface of the first antibacterial layer, the anti-aging layer is arranged on the lower surface of the second antibacterial layer, and the waterproof oil stain layer is arranged on the upper surface of the anti-oxidation layer. The problem that the TPU base film is easy to age due to over-cold and over-hot weather is avoided through the anti-aging layer, the problem that the TPU base film is easy to oxidize due to direct contact of air with the hardened layer is avoided, and water and greasy dirt can be prevented from entering the TPU base film through the waterproof greasy dirt layer, so that the overall use performance of the TPU base film is greatly improved, the service life is prolonged, and the service life of the TPU base film is prolonged. The recovery is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a film technical field, concretely relates to a kind of TPU film of environmental protection recyclable. BACKGROUND

[0002] TPU name is thermoplastic polyurethane elastomer rubber, mainly has the division of polyester type and polyether type, the hardness range of TPU is wide, and wear resistance, oil resistance, high transparency, good elasticity, is widely applied in daily necessities, sporting goods, toys, decorative materials etc., by the composite film made of TPU and other film materials, can be widely applied in waterproof, medical, outdoor, agriculture, decoration etc.

[0003] But the service life of traditional TPU film is short, weather cold and hot are easy to make it easy to age and oxidize, and when contacting oil dirt, it is easy to affect the use performance of composite film, and the overall functionality is poor.The multi-layer composite film in the prior art is often functionally isolated between layers, lacks synergistic effect, resulting in performance degradation in complex environments (such as exposure to oil and high temperature at the same time). SUMMARY

[0004] The utility model aims at providing a kind of TPU film of environmental protection recyclable, to solve the problem of the overall functionality of the traditional TPU film in prior art.

[0005] In order to achieve the above purpose, the utility model provides a kind of TPU film of environmental protection recyclable, comprising: TPU base film, the upper and lower surfaces of the TPU base film are respectively provided with first antibacterial layer and second antibacterial layer, the upper surface of the first antibacterial layer is provided with antioxidant layer, the lower surface of the second antibacterial layer is provided with anti-aging layer, the upper surface of the antioxidant layer is provided with waterproof oil dirt layer.

[0006] Further, the upper surface of the waterproof oil dirt layer is provided with flame-retardant layer, the flame-retardant layer is made of fire-retardant material and silica gel, and due to the presence of silica gel, the flame-retardant layer has porosity, allowing the external environment to partially contact the waterproof oil dirt layer, so that the waterproof oil dirt layer can still effectively play the waterproof and oil-proof function inside the flame-retardant layer. Each layer is compounded by dry facing or coating process to form an overall structure, and the layers are tightly combined and functionally synergistic.

[0007] Further, the upper and lower surfaces of the TPU base film are provided with water-based fabric layer by facing technology.

[0008] Further, the water-based fabric layer is a water-based TPU material layer.

[0009] Further, the inside of the first antibacterial layer and the second antibacterial layer is filled with antibacterial agent.

[0010] Further, the antioxidant layer is made of high molecular polymer masterbatch.

[0011] Further, the anti-aging layer is made of high-density polyethylene of the antioxidant.

[0012] Further, the waterproof and oil stain layer is a fluorine-containing waterproof and oil stain layer.

[0013] The TPU film provided by the utility model has the advantages that compared with the prior art, the upper and lower surfaces of the TPU base film are respectively provided with a first antibacterial layer and a second antibacterial layer, the upper surface of the first antibacterial layer is provided with an antioxidant layer, the lower surface of the second antibacterial layer is provided with an anti-aging layer, the upper surface of the antioxidant layer is provided with a waterproof and oil stain layer, and the upper surface of the waterproof and oil stain layer is provided with a flame-retardant layer. The anti-aging layer avoids the problem that the TPU base film is easily aged due to overcooling and overheating of weather, the antioxidant layer avoids oxidation caused by direct contact of air, the waterproof and oil stain layer prevents water and oil stains from penetrating into the inside of the TPU base film, and the porous structure of the flame-retardant layer as the outermost layer provides fire protection, indirectly contacts the external environment and plays an oil stain prevention function. Therefore, the overall use performance of the TPU base film is greatly improved, the service life is prolonged, and recycling is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the TPU film provided by the utility model.

[0015] BRIEF DESCRIPTION OF DRAWINGS

[0016] 1-TPU base film; 2-first antibacterial layer; 3-second antibacterial layer; 4-antioxidant layer; 5-anti-aging layer; 6-waterproof and oil stain layer; 7-flame-retardant layer. DETAILED DESCRIPTION

[0017] The utility model will be described in detail in combination with specific embodiments.

[0018] In the utility model, when the orientation word appears, the orientation word is for the convenience of narrating the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated having a specific orientation, being constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0019] In the utility model, except for another explicit provision and limitation, when the terms such as“set in”,“connected”,“connected” appear, these terms should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected, can be mechanically connected, can be directly connected, or connected through an intermediate medium, and can be connected in the interior of two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0020] For example,Figure 1 As shown, an environmentally friendly recyclable TPU film includes a TPU base film 1, the upper and lower surfaces of the TPU base film 1 are respectively provided with a first antibacterial layer 2 and a second antibacterial layer 3, the upper surface of the first antibacterial layer 2 is provided with an antioxidant layer 4, the lower surface of the second antibacterial layer 3 is provided with an anti-aging layer 5, and the upper surface of the antioxidant layer 4 is provided with a waterproof and oil stain layer 6. The upper surface of the waterproof and oil stain layer 6 is provided with a flame-retardant layer 7.

[0021] The key of the utility model lies in the synergistic effect of the interlayer structure: the flame-retardant layer 7 is the outermost layer, which is made of a mixture of fire-retardant material (such as aluminum hydroxide) and silica gel. The silica gel component makes the flame-retardant layer 7 porous, allowing water and oil stains to partially penetrate to the surface of the waterproof and oil stain layer 6. The waterproof and oil stain layer 6 is a fluorine-containing waterproof and oil stain layer, which has low surface energy and can effectively repel the penetrated liquid, thereby playing a waterproof and oil-proof function on the inside of the flame-retardant layer. This design not only ensures the flame-retardant performance, but also ensures the oil stain-proof effect, and the skilled person in the art can realize it through conventional composite process (such as dry facing or coating).

[0022] The anti-aging layer 5 avoids the problem that TPU base film 1 is easily aged by overcooling and overheating weather, and avoids the problem that the hardening layer is easily oxidized by direct contact with air, and the waterproof and oil stain layer 6 can prevent water and oil stains from penetrating into the TPU base film 1, thereby greatly improving the overall performance of the TPU base film 1 and prolonging the service life, and facilitating recycling.

[0023] The embodiment provides a preparation method of an environmentally friendly recyclable TPU film. First, a TPU base film 1 is provided, and a first antibacterial layer 2 and a second antibacterial layer 3 (containing an antibacterial agent) are compounded on the upper and lower surfaces thereof by dry facing technology. Then, an antioxidant layer 4 is coated on the first antibacterial layer 2, and an anti-aging layer 5 is coated under the second antibacterial layer 3. Next, a waterproof and oil stain layer 6 (containing fluorine material) is coated on the antioxidant layer 4. Finally, a flame-retardant layer 7 (mixed with fire-retardant material and silica gel) is coated on the waterproof and oil stain layer 6. The obtained multilayer structure is formed into an integral film by heat pressing and curing. The film is tested to show that the waterproof and oil stain layer can effectively function inside the flame-retardant layer, and the overall performance is improved.

[0024] In this embodiment, the upper and lower surfaces of the TPU base film 1 are provided with a water-based fabric layer by facing technology, which is a water-based TPU material layer. By setting the water-based fabric layer on the upper and lower surfaces of the TPU base film 1 by dry facing, the pollution to the environment and the harm to the workers producing the film can be effectively reduced.

[0025] In this embodiment, the first antibacterial layer 2 and the second antibacterial layer 3 are both filled with an antibacterial agent, which can effectively prevent bacteria from breeding inside, effectively resist mildew and corrosion, and improve the service life of the film. The antibacterial agent is a nano-silver antibacterial agent.

[0026] In the embodiment, the antioxidant layer 4 is made of a high-molecular polymer master batch, and the anti-aging layer 5 is made of high-density polyethylene of an antioxidant, which can harden the overall hardness of the film, delay the aging degree of the film, and improve the service life of the film.

[0027] In the case of no conflict, the above-mentioned embodiments and features in the embodiments can be combined with each other.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. An environmentally friendly and recyclable TPU film, characterized in that, include: The TPU base film has a first antibacterial layer and a second antibacterial layer on its upper and lower surfaces, respectively. The upper surface of the first antibacterial layer has an antioxidant layer, the lower surface of the second antibacterial layer has an anti-aging layer, and the upper surface of the antioxidant layer has a waterproof and oil-resistant layer. The upper surface of the waterproof oil stain layer is provided with a flame retardant layer, which is a mixture of fire-retardant material and silicone. Due to the presence of silicone, the flame retardant layer is porous, allowing the external environment to partially contact the waterproof oil stain layer, thereby enabling the waterproof oil stain layer to perform its waterproof and oil-proof functions.

2. The environmentally friendly and recyclable TPU film according to claim 1, characterized in that, The upper and lower surfaces of the TPU base film are provided with water-based fabric layers through a bonding technology.

3. The environmentally friendly and recyclable TPU film according to claim 2, characterized in that, The water-based fabric layer is a water-based TPU material layer.

4. The environmentally friendly and recyclable TPU film according to claim 1, characterized in that, Both the first and second antibacterial layers are filled with antibacterial agents.

5. The environmentally friendly and recyclable TPU film according to claim 1, characterized in that, The antioxidant layer is made of high molecular polymer masterbatch.

6. The environmentally friendly and recyclable TPU film according to claim 1, characterized in that, The anti-aging layer is made of high-density polyethylene with antioxidants.

7. The environmentally friendly and recyclable TPU film according to claim 1, characterized in that, The waterproof and oil-resistant layer is a fluorinated waterproof and oil-resistant layer.

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