TPU (thermoplastic polyurethane) film as well as raw material composition, preparation method and application thereof

Abstract

The invention discloses a TPU (thermoplastic polyurethane) film as well as a raw material composition, a preparation method and application thereof. The raw material composition of the TPU film is prepared from the following components in parts by mass: 40 to 50 parts of polyether polyol, 60 to 75 parts of diisocyanate, 20 to 30 parts of dihydric alcohol, 10 to 20 parts of an anti-reflection agent, 5 to 12 parts of a flame retardant, 2 to 3 parts of an antioxidant, 3 to 5 parts of a dispersing agent and 5 to 10 parts of a lubricating agent, wherein the anti-reflection agent comprises a tetraphenyl porphyrin compound; the flame retardant comprises a halogen-free flame retardant. The obtained TPU film has excellent mechanical properties and also can ensure excellent moisture permeability and flame retardance, and the whole preparation method is simple and easy to implement.

Description

Technical Field

[0001] This invention relates to a TPU film, its raw material composition, preparation method, and application. Background Technology

[0002] TPU, short for thermoplastic polyurethane elastomer, is a copolymer with a block structure of soft and hard segments. It has high strength and excellent mechanical properties and is widely used in daily life. However, TPU material itself is flammable, and existing TPU films have poor moisture permeability and flame retardancy, which limits its application in some high-performance applications, such as medical bandages, which require a certain degree of moisture permeability to improve user comfort.

[0003] Therefore, there is an urgent need for a TPU film that combines excellent mechanical properties, moisture permeability, and flame retardant properties. Summary of the Invention

[0004] To address the shortcomings of existing TPU films in simultaneously ensuring mechanical properties, moisture permeability, and flame retardancy, this invention provides a TPU film, its raw material composition, preparation method, and applications. By improving the raw material formulation of the TPU film, this invention enables the obtained TPU film to possess excellent mechanical properties while also ensuring excellent moisture permeability and flame retardancy, thus meeting the requirements of more demanding applications. Furthermore, the entire preparation method is simple, easy to implement, and readily scalable for mass production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] This invention provides a raw material composition for a TPU film, comprising the following components in parts by mass:

[0007] The composition includes 40-50 parts polyether polyol, 60-75 parts diisocyanate, 20-30 parts diol, 10-20 parts clearing agent, 5-12 parts flame retardant, 2-3 parts antioxidant, 3-5 parts dispersant, and 5-10 parts lubricant; among which...

[0008] The penetrating agent includes tetraphenylporphyrin compounds;

[0009] The flame retardant includes halogen-free flame retardants.

[0010] In this invention, the polyether polyol, diisocyanate, and diol can be considered as the basic synthetic raw materials for TPU films, while the remaining raw materials, such as the solubilizer, flame retardant, antioxidant, dispersant, and lubricant, can be considered as corresponding additives (or modifiers). It is through the synergistic effect of the components in the aforementioned specific proportions that the overall performance of the resulting TPU film is improved.

[0011] In some embodiments, the polyether polyol is present in parts by weight of 45-50. Studies have shown that polyether polyols have better moisture permeability and higher stability compared to common synthetic raw materials such as polyester polyols.

[0012] In this invention, the diisocyanate may be conventional in the art, such as diphenylmethane diisocyanate.

[0013] In some embodiments, the diisocyanate is present in parts by weight of 68-75.

[0014] In this invention, the diol can be conventional in the art, such as 1,4-butanediol.

[0015] In some embodiments, the diol is in the form of 25-30 parts by mass.

[0016] In some embodiments, the tetraphenylporphyrin compound includes aminotetraphenylporphyrin. Compared to common antireflective agents in the art, this type of compound can better enhance the air permeability and moisture permeability of the resulting TPU film.

[0017] In some embodiments, the amount of the penetration enhancer is 13-20 parts by weight, for example 15 or 17 parts.

[0018] In this invention, the halogen-free flame retardant may refer to a flame retardant that does not contain any halogen.

[0019] In some embodiments, the halogen-free flame retardant includes phosphonate flame retardants, preferably intumescent halogen-free flame retardants such as NP-PU07 halogen-free flame retardant, and / or JY401 halogen-free flame retardant, more preferably NP-PU07 halogen-free flame retardant.

[0020] In some embodiments, the flame retardant is present in 7-12 parts by weight, for example, 9 parts.

[0021] In some embodiments, the raw material composition of the TPU film also includes a base film.

[0022] The base film preferably includes a PE film and / or a PET film, and more preferably a PE film.

[0023] The thickness of the base film is preferably 0.07-0.08 mm, for example 0.075 mm.

[0024] In some embodiments, the antioxidant includes pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010).

[0025] In some embodiments, the dispersant includes stearamide.

[0026] In some embodiments, the dispersant is present in parts by weight of 4-5 parts.

[0027] In some implementations, the lubricant includes zinc stearate.

[0028] In some embodiments, the lubricant is present in parts by weight of 5-7 parts.

[0029] In some embodiments, the raw material composition of the TPU film also includes a plasticizer.

[0030] The plasticizer preferably includes dioctyl phthalate.

[0031] The plasticizer is preferably present in 4-8 parts by mass, for example, 5 or 6 parts.

[0032] In some embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0033] The composition includes 40-50 parts of polyether polyol, 60-75 parts of diisocyanate, 20-30 parts of diol, 10-20 parts of penetration enhancer, 5-12 parts of flame retardant, 2-3 parts of antioxidant, 3-5 parts of dispersant, 5-10 parts of lubricant, and a base film; the penetration enhancer is aminotetraphenylporphyrin; the flame retardant is a phosphonate flame retardant.

[0034] In some preferred embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0035] The composition includes 40-50 parts polyether polyol, 60-75 parts diisocyanate, 20-30 parts diol, 10-20 parts clearing agent, 5-12 parts flame retardant, 2-3 parts antioxidant, 3-5 parts dispersant, 5-10 parts lubricant, 4-8 parts plasticizer, and a base film; the clearing agent is aminotetraphenylporphyrin; the flame retardant is NP-PU07 halogen-free flame retardant and / or JY401 halogen-free flame retardant; and the base film is PE film and / or PET film.

[0036] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0037] The composition includes 40 parts of polyether polyol, 60 parts of diphenylmethane diisocyanate, 20 parts of 1,4-butanediol, 10 parts of aminotetraphenylporphyrin, 7 parts of NP-PU07 halogen-free flame retardant, 2 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 5 parts of dioctyl phthalate, and a base film; the base film is a PE film.

[0038] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0039] The composition includes 45 parts of polyether polyol, 68 parts of diphenylmethane diisocyanate, 25 parts of 1,4-butanediol, 15 parts of aminotetraphenylporphyrin, 9 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 4 parts of stearamide, 7 parts of zinc stearate, 6 parts of dioctyl phthalate, and a base film; the base film is a PE film.

[0040] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0041] The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film.

[0042] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0043] The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of JY401 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film.

[0044] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0045] The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PET film.

[0046] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0047] The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 10 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film.

[0048] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0049] The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 13 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film.

[0050] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0051] The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 17 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film.

[0052] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0053] 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, and 8 parts of dioctyl phthalate.

[0054] In some specific embodiments, the raw material composition of the TPU film comprises the following components in parts by weight:

[0055] The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, and a base film; the base film is a PE film.

[0056] The present invention also provides a method for preparing a TPU film, the method comprising the following steps:

[0057] The TPU film is obtained by mixing the components of the raw material composition, granulating, and extruding.

[0058] The raw material composition of the TPU film is as defined above.

[0059] In some embodiments, when the raw material composition of the TPU film includes a base film, the method for preparing the TPU film includes the following steps:

[0060] S1. Mix the components except the basement membrane, granulate, and extrude to obtain an intermediate;

[0061] S2. The intermediate and the base film are combined to obtain the TPU film.

[0062] The base film can be regarded as the substrate in the TPU film, and it does not undergo chemical changes during the entire composite process. That is, the composite step only involves the simple bonding of the base film and the intermediate. Those skilled in the art will know its specific meaning.

[0063] In this invention, the steps of mixing, granulation, extrusion, and compounding can all be performed according to conventional operations in the art.

[0064] In some implementations, the mixing and granulation are carried out independently in a twin-screw granulator.

[0065] In some implementations, the mixing temperature is 170-210°C, for example, 190°C.

[0066] In some implementations, the mixing time is 25-30 minutes.

[0067] In some implementations, the mixing process further includes a drying step.

[0068] The drying process, for example, is carried out in an oven.

[0069] The drying temperature is, for example, 100°C.

[0070] The drying time is, for example, 4 hours.

[0071] In some implementations, the extrusion is carried out in a single-screw casting machine.

[0072] In some implementations, the compounding is performed in a multi-screw cast winding machine.

[0073] The present invention also provides a TPU film, which is prepared using the raw material composition of the TPU film as described above or the preparation method of the TPU film as described above.

[0074] In some embodiments, the tensile strength of the TPU film is not less than 36 MPa, preferably 36-50 MPa.

[0075] In some embodiments, the flame retardancy rating of the TPU film is not lower than A1, and preferably A0.

[0076] In some embodiments, the moisture permeability of the TPU film within 24 hours is not less than 1100 g / m³. 2 The optimal concentration is 1100-2000 g / m³. 2 .

[0077] The present invention also provides a raw material composition of the TPU film as described above or the application of the TPU film as described above in medical products.

[0078] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0079] The reagents and raw materials used in this invention are all commercially available.

[0080] The positive and progressive effects of this invention are as follows:

[0081] This invention, based on a comprehensive improvement in the raw material formulation, enables the resulting TPU film to possess excellent mechanical properties while also ensuring excellent moisture permeability and flame retardancy, thus meeting the requirements of more demanding applications. Specifically, it simultaneously guarantees that the tensile strength of the resulting TPU film is not less than 36 MPa, the flame retardancy rating is not less than A1, and the moisture permeability within 24 hours is not less than 1100 g / m³. 2 Furthermore, the entire preparation method is simple, easy to implement, low in cost, and easy to scale up for production. Attached Figure Description

[0082] Figure 1 This is a schematic diagram of the equipment and usage of the multi-screw casting and winding machine used in the embodiments and comparative examples of the present invention.

[0083] The attached figures are labeled as follows:

[0084] 1-Upper winding roller; 2-Conveyor belt; 3-First discharge mold; 4-Second discharge mold; 5-Discharge port; 6-Front roller; 7-Middle roller; 8-First driven roller; 9-Second driven roller; 10-Winding device; 11-Support. Detailed Implementation

[0085] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0086] Unless otherwise specified, the specific information of the raw materials used in the following embodiments and comparative examples is as follows:

[0087] (1) Polyether polyol: purchased from Jinhua Chemical (Group) Co., Ltd.

[0088] (2) Diisocyanate: Diphenylmethane diisocyanate, purchased from Guangzhou Rongyao Chemical Co., Ltd.

[0089] (3) Diol: 1,4-Butanediol, purchased from Shanghai Huayuan Century Trading Co., Ltd.

[0090] (3) Penetrating agent: aminotetraphenylporphyrin (TAPP).

[0091] (4) Antioxidant: Antioxidant 1010.

[0092] (5) Dispersant: stearamide.

[0093] (6) Lubricant: zinc stearate.

[0094] (7) Flame retardants: Intumescent halogen-free flame retardant (NP-PU07), purchased from Shanghai Qihe Chemical Co., Ltd.; JY401 halogen-free flame retardant.

[0095] (8) Plasticizer: dioctyl phthalate (DOP).

[0096] Example 1

[0097] The TPU film of this embodiment was prepared by following the steps below:

[0098] (1) Take 40 parts of polyether polyol, 60 parts of diphenylmethane diisocyanate, 20 parts of 1,4-butanediol, 5 parts of lubricant, 2 parts of antioxidant, 5 parts of plasticizer, 5 parts of dispersant, 10 parts of penetration enhancer and 7 parts of flame retardant (NP-PU07) by mass.

[0099] (2) Preparation of TPU film intermediates:

[0100] The above raw materials are thoroughly mixed at 190℃ using a twin-screw granulator for 30 minutes. The mixture is then cooled with cooling water and granulated to obtain TPU mixed particles. After drying in an oven at 100℃ for 4 hours, the TPU mixed particles are added to a single-screw casting machine for melt blending. The resulting mixture is then extruded through a die to cast into an intermediate (also in film form) TPU film. Once the film flow stabilizes, its thickness can be maintained at 0.025 mm.

[0101] (3) Composite of TPU film intermediates and base film:

[0102] This step uses, for example Figure 1 The twin-screw casting rewinding machine shown is mainly composed of the following components: upper winding roller 1, conveyor belt 2, first discharge mold 3, second discharge mold 4, discharge port 5, front roller 6, middle roller 7, first driven roller 8, second driven roller 9, winding device 10, and support frame 11.

[0103] Specifically:

[0104] First, the front roller 6 and the middle roller 7 are adjusted to a certain distance. Then, a PE film with a thickness of 7.5 mil (0.075 mm) is fixed to the upper take-up roller 1 through the bracket 11 and conveyed by the conveyor belt 2 into the gap between the front roller 6 and the middle roller 7. At the same time, the resulting TPU film intermediate is conveyed out from the discharge port 5 through the first discharge mold 3 and the second discharge mold 4. By adjusting the roller spacing, the PE film and the TPU film intermediate can be laminated. After being cooled by the first driven roller 8, it enters the second driven roller 9 and is then processed by the take-up equipment 10 to obtain the TPU film with the PE film.

[0105] Example 2

[0106] Compared to Example 1, the only difference is:

[0107] By weight, 45 parts of polyether polyol, 68 parts of diphenylmethane diisocyanate, 25 parts of 1,4-butanediol, 7 parts of lubricant, 3 parts of antioxidant, 6 parts of plasticizer, 4 parts of dispersant, 15 parts of clearing agent, and 9 parts of flame retardant were respectively used to prepare TPU film.

[0108] The specific process steps are consistent with those in Example 1.

[0109] Example 3

[0110] Compared to Example 1, the only difference is:

[0111] By weight, 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 5 parts of lubricant, 3 parts of antioxidant, 8 parts of plasticizer, 5 parts of dispersant, 20 parts of clearing agent, and 12 parts of flame retardant were respectively used to prepare TPU film.

[0112] The specific process steps are consistent with those in Example 1.

[0113] Example 4

[0114] Compared to Example 3, the only difference is that the mass fraction of the penetration enhancer is 10 parts, while the amount of other raw materials and the process steps are the same as in Example 3.

[0115] Example 5

[0116] Compared to Example 3, the only difference is that the mass fraction of the penetration enhancer is 13 parts, while the amount of the remaining raw materials and the process steps are the same as in Example 3.

[0117] Example 6

[0118] Compared to Example 3, the only difference is that the mass fraction of the brightening agent is 17 parts, while the amount of other raw materials and the process steps are the same as in Example 3.

[0119] Example 7

[0120] Compared to Example 3, the only difference is that the obtained TPU film intermediate was not further compounded with the base film, that is, step (3) was not involved, and the TPU film intermediate was directly used as the final TPU film. The amount of other raw materials and process steps were the same as in Example 3.

[0121] Example 8

[0122] Compared to Example 3, the only difference is that the flame retardant used is JY401 halogen-free flame retardant, while the amount of other raw materials and process steps are the same as in Example 3.

[0123] Example 9

[0124] Compared to Example 3, the only difference is that the base film used is a PET film with a thickness of 0.075 mm, while the amount of other raw materials and process steps are the same as in Example 3.

[0125] Example 10

[0126] Compared to Example 3, the only difference is that no plasticizer was added, while the amount of other raw materials and the process steps are the same as in Example 3.

[0127] Comparative Example 1

[0128] Compared to Example 3, the only difference is that no flame retardant was added, while the amount of other raw materials and process steps remained the same as in Example 3.

[0129] Comparative Example 2

[0130] Compared to Example 3, the only difference is that no brightening agent was added, while the amount of other raw materials and process steps remained the same as in Example 3.

[0131] Comparative Example 3

[0132] Compared to Example 3, the only difference is that the flame retardant has a mass fraction of 5 parts, and no penetration enhancer is added. The amount of other raw materials and the process steps are the same as in Example 3.

[0133] Comparative Example 4

[0134] Compared to Example 3, the only difference is that the flame retardant has a mass fraction of 7 parts, and no penetration enhancer is added. The amount of other raw materials and the process steps are the same as in Example 3.

[0135] Comparative Example 5

[0136] Compared to Example 3, the only difference is that the flame retardant has a mass fraction of 9 parts, and no penetration enhancer is added. The amount of other raw materials and the process steps are the same as in Example 3.

[0137] Effect Example

[0138] The following properties were tested for the TPU films obtained in Examples 1-10 and Comparative Examples 1-5, respectively:

[0139] 1. Moisture permeability test

[0140] According to the standard test method for measuring the water vapor permeability of materials, E96 / E96M-2014, the moisture permeability of the TPU films in each example and comparative example was tested under the following conditions: 38±0.5℃ and relative humidity 90%±5%.

[0141] 2. Flame retardant performance test

[0142] According to the standard test method for testing the flame retardant properties of materials in GB 8410-2006 "Combustion Characteristics of Automotive Interior Materials", the flame retardant properties of the TPU films in each example and comparative example were tested under the following conditions: 23±2℃ and relative humidity 50%±5%.

[0143] 3. Tensile strength test

[0144] The tensile strength of the TPU films in each example and comparative example was tested according to the standard test method of ASTM D412-06 "Tension test method for vulcanized rubber and thermoplastic elastomers". The test conditions were 23±2℃ and 50%±5% relative humidity.

[0145] The results are shown in Table 1.

[0146] Table 1

[0147]

[0148] As shown in Table 1, the TPU films obtained in the embodiments of the present invention can simultaneously guarantee: tensile strength not less than 36 MPa, and up to 45.69 MPa; flame retardancy rating not less than A1, and up to A0; and moisture permeability within 24 hours not less than 1100 g / m³. 2 Up to 1956g / m 2 .

[0149] With variations in the dosage of each component, the type of flame retardant, the type and type of base film, and the addition of plasticizers, the performance of the TPU films obtained in different embodiments will show certain differences; however, the raw material formulation corresponding to Example 3 is the optimal solution. Furthermore, research has found that during the actual winding process, TPU films with PE film appear to wind up more smoothly without wrinkles, which to some extent helps maintain the strength of the produced TPU film.

[0150] Compared to Example 3, Comparative Example 1, without the addition of flame retardant, showed a significant decrease in the flame retardancy rating of the resulting TPU film, and also a reduction in moisture permeability.

[0151] Compared to Example 3, Comparative Examples 2-5, without the addition of a clearing agent, showed a significant decrease in the moisture permeability of the resulting TPU films and a reduction in tensile strength. Furthermore, in Comparative Examples 2-5, the flame retardant properties of the resulting TPU films deteriorated accordingly with the reduction in the amount of flame retardant.

Claims

1. A raw material composition for a TPU film, characterized in that, The raw material composition of the TPU film comprises the following components in parts by mass: The composition includes 40-50 parts polyether polyol, 60-75 parts diisocyanate, 20-30 parts diol, 10-20 parts clearing agent, 5-12 parts flame retardant, 2-3 parts antioxidant, 3-5 parts dispersant, and 5-10 parts lubricant; among which... The penetrating agent includes tetraphenylporphyrin compounds; The flame retardant includes halogen-free flame retardants.

2. The raw material composition of the TPU film as described in claim 1, characterized in that, The polyether polyol is 45-50 parts by weight; And / or, the diisocyanate includes diphenylmethane diisocyanate; And / or, the diisocyanate is present in parts by mass of 68-75 parts; And / or, the diol includes 1,4-butanediol; And / or, the diol is 25-30 parts by mass; And / or, the tetraphenylporphyrin compounds include aminotetraphenylporphyrin; And / or, the amount of the penetration enhancer is 13-20 parts by weight, for example 15 parts or 17 parts; And / or, the halogen-free flame retardant includes phosphonate flame retardants, preferably including NP-PU07 halogen-free flame retardant and / or JY401 halogen-free flame retardant, more preferably NP-PU07 halogen-free flame retardant; And / or, the flame retardant is present in 7-12 parts by mass, for example, 9 parts; And / or, the raw material composition of the TPU film further includes a base film; The base film preferably includes a PE film and / or a PET film, and more preferably a PE film; The thickness of the base film is preferably 0.07-0.08 mm, for example 0.075 mm.

3. The raw material composition for the TPU film as described in claim 1, characterized in that, The antioxidant includes pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; And / or, the dispersant includes stearamide; And / or, the dispersant is present in 4-5 parts by mass; And / or, the lubricant includes zinc stearate; And / or, the lubricant is 5-7 parts by weight; And / or, the raw material composition of the TPU film further includes a plasticizer; Preferably, the plasticizer includes dioctyl phthalate; The plasticizer is preferably present in 4-8 parts by mass, for example, 5 or 6 parts.

4. The raw material composition of the TPU film according to any one of claims 1-3, characterized in that, The raw material composition of the TPU film comprises the following components in parts by mass: The composition includes 40-50 parts polyether polyol, 60-75 parts diisocyanate, 20-30 parts diol, 10-20 parts clearing agent, 5-12 parts flame retardant, 2-3 parts antioxidant, 3-5 parts dispersant, 5-10 parts lubricant, and a base film; the clearing agent is aminotetraphenylporphyrin; the flame retardant is a phosphonate flame retardant. Preferably, the raw material composition of the TPU film comprises the following components in parts by mass: The composition includes 40-50 parts polyether polyol, 60-75 parts diisocyanate, 20-30 parts diol, 10-20 parts clearing agent, 5-12 parts flame retardant, 2-3 parts antioxidant, 3-5 parts dispersant, 5-10 parts lubricant, 4-8 parts plasticizer, and a base film; the clearing agent is aminotetraphenylporphyrin; the flame retardant is NP-PU07 halogen-free flame retardant and / or JY401 halogen-free flame retardant; and the base film is a PE film and / or a PET film. More preferably, the raw material composition of the TPU film comprises the following components in parts by mass: The composition includes 40 parts of polyether polyol, 60 parts of diphenylmethane diisocyanate, 20 parts of 1,4-butanediol, 10 parts of aminotetraphenylporphyrin, 7 parts of NP-PU07 halogen-free flame retardant, 2 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 5 parts of dioctyl phthalate, and a base film; the base film is a PE film. Alternatively, the raw material composition of the TPU film comprises the following components in parts by weight: The composition includes 45 parts of polyether polyol, 68 parts of diphenylmethane diisocyanate, 25 parts of 1,4-butanediol, 15 parts of aminotetraphenylporphyrin, 9 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 4 parts of stearamide, 7 parts of zinc stearate, 6 parts of dioctyl phthalate, and a base film; the base film is a PE film. Alternatively, the raw material composition of the TPU film comprises the following components in parts by weight: The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film. Alternatively, the raw material composition of the TPU film comprises the following components in parts by weight: The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of JY401 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film. Alternatively, the raw material composition of the TPU film comprises the following components in parts by weight: The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 20 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PET film. Alternatively, the raw material composition of the TPU film comprises the following components in parts by weight: The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 10 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film. Alternatively, the raw material composition of the TPU film comprises the following components in parts by weight: The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 13 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film. Alternatively, the raw material composition of the TPU film comprises the following components in parts by weight: The composition includes 50 parts of polyether polyol, 75 parts of diphenylmethane diisocyanate, 30 parts of 1,4-butanediol, 17 parts of aminotetraphenylporphyrin, 12 parts of NP-PU07 halogen-free flame retardant, 3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 5 parts of stearamide, 5 parts of zinc stearate, 8 parts of dioctyl phthalate, and a base film; the base film is a PE film.

5. A method for preparing a TPU film, characterized in that, The method for preparing the TPU film includes the following steps: The TPU film is obtained by mixing the components of the raw material composition, granulating, and extruding. The raw material composition of the TPU film is as defined in any one of claims 1-4.

6. The method for preparing the TPU film as described in claim 5, characterized in that, When the raw material composition of the TPU film includes a base film, the method for preparing the TPU film includes the following steps: S1. Mix the components except the basement membrane, granulate, and extrude to obtain an intermediate; S2. The intermediate and the base film are combined to obtain the TPU film.

7. The method for preparing the TPU film as described in claim 5 or 6, characterized in that, The mixing and granulation are carried out independently in a twin-screw granulator; And / or, the mixing temperature is 170-210°C, for example 190°C; And / or, the mixing time is 25-30 min; And / or, the mixing process further includes a drying step; The drying process is carried out, for example, in an oven; The drying temperature is, for example, 100°C; The drying time is, for example, 4 hours; And / or, the extrusion is carried out in a single-screw casting machine; And / or, the compounding is carried out in a multi-screw cast winding machine.

8. A TPU film, characterized in that, The TPU film is prepared using the raw material composition of the TPU film as described in any one of claims 1-4 or the preparation method of the TPU film as described in any one of claims 5-7.

9. The TPU film as described in claim 8, characterized in that, The tensile strength of the TPU film is not less than 36 MPa, preferably 36-50 MPa; And / or, the flame retardancy rating of the TPU film is not lower than A1, preferably A0; And / or, the moisture permeability of the TPU film within 24 hours is not less than 1100 g / m³. 2 The optimal concentration is 1100-2000 g / m³. 2 .

10. The use of a raw material composition of a TPU film as described in any one of claims 1-4 or the TPU film as described in claim 8 or 9 in medical products.

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