A thermoplastic polyurethane material, its preparation method and applications

Abstract

The present invention discloses a thermoplastic polyurethane material, its preparation method and application, belonging to the technical field of polyurethane materials. The thermoplastic polyurethane material is TPU-M, where M represents a cation. In the polyurethane material of the present invention, indole diol and cationic functional groups are introduced into the polyurethane backbone, successfully establishing cation-π interactions between polymer chains and realizing dynamic crosslinking of polymer chains. Metal ions act as crosslinking points between polymer chains. Compared with other supramolecular "point-to-point" formed dynamic bonds such as hydrogen bonds and metal coordination bonds, cation-π belongs to "point-to-face" interactions. The formation range of this force is expanded, the construction is simpler and more convenient, making the crosslinking of polymer chains faster and achieving excellent enhancement and toughening effects of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of polyurethane materials, and particularly to a thermoplastic polyurethane material, a preparation method thereof, and an application thereof. Background Art

[0002] Polyurethane is a material widely used in national life and production. It is highly favored due to its excellent properties such as good wear resistance, wide hardness range, large adjustable range of properties, excellent processing performance, and biodegradability. It has a wide range of applications in the fields of construction, automotive, furniture, medical devices, etc. However, traditional polyurethane materials still have some defects, such as poor toughness, poor impact resistance, short lifespan, etc., resulting in their gradually being unable to meet the growing needs of people. As is well known, in a polymer system, the mechanical strength of polymer materials can be effectively improved by physical or chemical modification methods. However, while the mechanical strength of polymer materials is improved, their toughness mostly becomes worse, they become brittle, their ability to resist impact and stress cracks decreases, and plastic deformation is restricted, thus limiting the application scope of polymer materials.

[0003] In order to obtain a polymer material with both high strength and high toughness, people usually add various nano-fillers to the polymer matrix, but the balance between mechanical strength and toughness has to be considered. Generally, when the strength is increased, the toughness will become worse, and vice versa.

[0004] In addition, although the thermal stability and mechanical strength of polymers can be further enhanced by traditional chemical cross-linking methods, the toughness of the cross-linked polymers will be affected and it will be very difficult to recycle them, they cannot be remolded, and waste materials can only be treated by landfill method, which is not conducive to environmental protection and rational reuse of resources. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a thermoplastic polyurethane material, a preparation method thereof, and an application thereof.

[0006] The present invention is achieved through the following technical solutions:

[0007] A thermoplastic polyurethane material, wherein the thermoplastic polyurethane material is TPU-M, where M represents a cation, and the molecular formula of TPU is

[0008] A preparation method of a thermoplastic polyurethane material, and the polymerization route of the TPU is as follows:

[0009]

[0010] The preparation method of the TPU includes the following steps: Under a nitrogen atmosphere, isophorone diisocyanate (IPDI), PEG400, and DBTDL are added to a two-necked flask, and pre-polymerization is carried out at 70-90 °C for 1-2 h. After the pre-polymerization is completed, indole diol is added and diluted with DMF. The viscosity will increase rapidly after adding indole diol. Adjust the rotation speed and supplement DMF, and continue to react at 70-90 °C for 3-4 h. After the polymerization is completed, a TPU polymer solution is obtained; the molar feed ratio of IPDI:PEG400:indole diol is 2:1:1;

[0011] The preparation method of the TPU-M includes the following steps: Take the TPU polymer solution in a small glass bottle, and ultrasonically disperse the accurately weighed chloride of cation M evenly in DMSO. The addition amount of Mg 2+ is 0%-0.15% of the indole molar amount in the polymer, and is added to the polymer solution according to the molar ratio and ultrasonically mixed evenly to obtain the TPU-M polymer solution; After ultrasonic homogenization, pour the polymer solution into a mold plate, put it into an oven and dry it at 80 °C for 24 h to remove the solvent. After drying is completed, take out the mold plate, cool it to room temperature, and then peel off the film to obtain the TPU-M thin film material;

[0012] The synthesis route of the indole diol is as follows:

[0013]

[0014] The preparation method of the indole diol includes the following steps:

[0015] (1) Protection of tryptophol: Weigh tert-butyldimethylchlorosilane in a reaction flask, add dichloromethane to completely dissolve it, and place it in an ice bath. Drop the dichloromethane mixed solution of imidazole and tryptophol at a rate of 1-3 drops / second. After dropping, stir the reaction solution at room temperature (20-25 °C) overnight, and then extract it with brine and ethyl acetate to obtain the tryptophol protection product; the molar ratio of tert-butyldimethylchlorosilane: tryptophol: imidazole is 1:1:1.5-2.0;

[0016] (2) Secondary protection: Dissolve the tryptophol protection product in DMF under ice bath conditions, add NaH and stir for 1-1.5 h, and drop the mixed solution of 3-bromopropoxy tert-butyldimethylsilane and DMF. After heating to 90-110 °C and reacting for 3-4 h, add water to the reaction flask until no bubbles are generated, extract with water and ethyl acetate, remove the upper layer solution, add anhydrous magnesium sulfate and let it stand overnight, then concentrate and purify by column chromatography to obtain the tryptophol secondary protection product. The eluent for column chromatography purification is PE:EA = 60:1 and 5% triethylamine;

[0017] (3) Deprotection: Dissolve the secondary protected product of chromanol in tetrahydrofuran, add tetrabutylammonium fluoride, and react at room temperature for 1.5 h. After extraction with water and ethyl acetate, purify by column chromatography and dry to finally obtain indole diol.

[0018] The cation M is Mg 2+ , Na + , Cu 2+ , K + One of them.

[0019] The preparation method of the TPU includes the following steps: Under a nitrogen atmosphere, add 1.125 parts by weight of isophorone diisocyanate IPDI, 1 part by weight of PEG400, and 1.5 - 2 parts by weight of DBTDL to a two-necked flask, and carry out prepolymerization at 70 - 90 °C for 1 - 2 h. After the prepolymerization is completed, add 0.274 parts by weight of indole diol, dilute with 4 - 24 parts by weight of DMF. After adding indole diol, the viscosity will increase rapidly, and the rotation speed needs to be adjusted and 0.8 - 10 parts by weight of DMF need to be added. Continue to react at 70 - 90 °C for 3 - 4 h to obtain a TPU polymer solution; the molar feed ratio of IPDI:PEG400:indole diol is 2:1:1.

[0020] An application of a thermoplastic polyurethane material, the TPU-M polymer is pre-dried and then extruded and granulated for use as a cable sheath material.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] In the polyurethane material of the present invention, indole diol and cation functional groups are introduced into the polyurethane backbone, and cation-π interactions between polymer chains can be successfully established, realizing the dynamic crosslinking of polymer chains. Metal ions act as crosslinking points between polymer chains. Compared with other supramolecular "point-to-point" formed dynamic bonds such as hydrogen bonds and metal coordination bonds, cation-π belongs to "point-to-face" interactions. The formation range of this interaction force is expanded, the construction is simpler and more convenient, making the crosslinking of polymer chains faster and achieving excellent strengthening and toughening effects of the material. Description of the Drawings

[0023] Figure 1 It is the mechanical property test chart of the TPU-Cu film material of the present invention;

[0024] Figure 2 It is the mechanical property test chart of the TPU-Mg film material of the present invention;

[0025] Figure 3 It is the original mechanical property chart of the TPU film material of the present invention;

[0026] Figure 4 It is the schematic diagram of the TPU-Mg film of the present invention;

[0027] Figure 5 For the Mg of the present invention 2+ Schematic diagram of the principle of the modified TPU material. Detailed implementation manners

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] Sources of the reagents used in the present invention:

[0030]

[0031] A thermoplastic polyurethane material, wherein the thermoplastic polyurethane material is TPU-M, where M represents a cation, and the cation M is Mg 2+ , Na + , Cu 2+ , K + One of them, and the molecular formula of TPU is

[0032]

[0033] Among them, the polymerization route of the TPU is as follows:

[0034]

[0035] The preparation method of the TPU includes the following steps: Under a nitrogen atmosphere, 1.125 parts by weight of isophorone diisocyanate IPDI, 1 part by weight of PEG400, and 1.5 - 2 parts by weight of DBTDL are added to a two-necked flask, and pre-polymerization is carried out at 70 - 90 °C for 1 - 2 h. After the pre-polymerization is completed, 0.274 parts by weight of indole diol is added, and it is diluted with 4 - 24 parts by weight of DMF. The viscosity will increase rapidly after adding indole diol, and the rotation speed needs to be adjusted and 0.8 - 10 parts by weight of DMF is added additionally, and the reaction continues at 70 - 90 °C for 3 - 4 h. After the polymerization is completed, a TPU polymer solution is obtained; the molar feeding ratio of IPDI:PEG400:indole diol is 2:1:1.

[0036] The synthesis route of the indole diol is as follows:

[0037]

[0038] The preparation method of the indole diol includes the following steps:

[0039] (1) Protection of chromanol: Weigh accurately 20 mmol of tert-butyldimethylchlorosilane into a reaction flask. After dissolving it completely in 20 mL of dichloromethane, cool it in an ice bath. Then, slowly drip a dichloromethane mixed solution of 20 mmol of imidazole and 30 mmol of chromanol at a rate of 1 drop every 3 seconds. After the addition, stir the reaction solution overnight at room temperature (20 - 25 °C). Then, extract it with 50 mL of a mixture of brine and ethyl acetate to obtain the chromanol protected product. The molar ratio of tert-butyldimethylchlorosilane:chromanol:imidazole is 1:1:1.5 - 2.0;

[0040] (2) Secondary protection: Dissolve the chromanol protected product in 30 mL of DMF under ice bath conditions. Add NaH and stir for 1 h, then slowly drip 10 mL of a mixed solution of 3-bromopropoxy tert-butyldimethylsilane and DMF. The molar ratio of NaH to the chromanol protected product is 1:1. Heat the reaction mixture to 100 °C and react for 3.5 h. Then, add water to the reaction flask until no bubbles are generated. Extract it with 50 mL of a mixture of water and ethyl acetate, discard the upper layer solution, add 5.0 g of anhydrous magnesium sulfate and let it stand overnight. After concentration, purify it by column chromatography. The eluent used for column chromatography is PE:EA = 60:1 + 5% triethylamine;

[0041] (3) Deprotection: Dissolve the chromanol secondary protected product in 20 mL of tetrahydrofuran, add 3 mL of 1 mol / L tetrabutylammonium fluoride, and react at room temperature for 1 - 2 h. After extraction with 50 mL of a mixture of water and ethyl acetate, purify it by column chromatography and then dry it to finally obtain indole diol.

[0042] Example 1

[0043] Preparation of TPU: Under a nitrogen atmosphere, add 0.9 g of isophorone diisocyanate IPDI (4 mmol), 0.8 g of PEG400 (2 mmol), and 1.5 g of DBTDL into a two-necked flask. Prepolymerize at 80 °C for 1 h. After the prepolymerization is completed, add 0.2193 g of indole diol (2 mmol), dilute it with 20 mL of DMF. The viscosity will increase rapidly after adding indole diol, so adjust the rotation speed and add an additional 4 mL of DMF. Continue to react at 90 °C for 3 h to obtain a polymer solution.

[0044] Example 2

[0045] TPU Preparation: Under a nitrogen atmosphere, 4.5 g of isophorone diisocyanate IPDI (20 mmol), 4.0 g of PEG400 (10 mmol), and 6.0 g of DBTDL were added to a two-necked flask. Prepolymerization was carried out at 80 °C for 1.5 h. After the prepolymerization was completed, 1.096 g of indole diol (10 mmol) was added and diluted with 60 mL of DMF. The viscosity would increase rapidly after adding indole diol, so the rotation speed needed to be adjusted and 10 mL of DMF was added additionally. The reaction was continued at 90 °C for 4 h to obtain a polymer solution.

[0046] Example 3

[0047] TPU Preparation: Under a nitrogen atmosphere, 9.0 g of isophorone diisocyanate IPDI (40 mmol), 8.0 g of PEG400 (20 mmol), and 12.0 g of DBTDL were added to a two-necked flask. Prepolymerization was carried out at 80 °C for 1 - 3 h. After the prepolymerization was completed, 2.1928 g of indole diol (20 mmol) was added and diluted with 90 mL of DMF. The viscosity would increase rapidly after adding indole diol, so the rotation speed needed to be adjusted and 18 mL of DMF was added additionally. The reaction was continued at 90 °C for 5 h to obtain a polymer solution.

[0048] The polymer solutions obtained after polymerization in Examples 1 - 3 were spread on a mold plate and placed in an oven to dry at 80 °C for 12 h, and a polymer film, namely the TPU film material, could be obtained.

[0049] Example 4

[0050] Preparation of TPU-Mg(0.1%) Film Material:

[0051] Take the TPU polymer solution obtained from any one of Examples 1 - 3 in a small glass bottle, and accurately weigh MgCl 2 Ultrasonically disperse it evenly in DMSO. The addition amount of Mg 2+ is 0.1% of the indole molar amount in the polymer, and it is added to the polymer solution according to the molar ratio and ultrasonically mixed evenly to obtain a TPU-Mg polymer solution; after ultrasonic homogenization, the polymer solution is poured into a mold plate and placed in an oven to dry at 80 °C for 24 h to remove the solvent. After drying is completed, take out the mold plate, cool it to room temperature, and then peel off the film to obtain the TPU-Mg(0.1%) film material.

[0052] Example 5

[0053] Preparation of TPU-Mg(0.15%) Film Material:

[0054] Take the TPU polymer solution obtained from any one of Examples 1 - 3 in a small glass bottle, and accurately weigh MgCl 2It was ultrasonically dispersed uniformly in DMSO, and the addition amount of Mg 2+ was 0.15% of the molar amount of indole in the polymer. It was added to the polymer solution according to the molar ratio and ultrasonically mixed evenly to obtain the TPU-Mg polymer solution; after ultrasonic homogenization, the polymer solution was poured into a mold plate, placed in an oven and dried at 80 °C for 24 h to remove the solvent. After drying was completed, the mold plate was taken out, cooled to room temperature, and then the film was peeled off to obtain the TPU-Mg(0.15%) film material.

[0055] Example 6

[0056] Preparation of TPU-Cu(0.1%) film material:

[0057] Take the TPU polymer solution obtained in any one of Examples 1-3 in a small glass bottle, and weigh accurately CuCl 2 It was ultrasonically dispersed uniformly in DMSO, and the addition amount of Cu 2+ was 0.1% of the molar amount of indole in the polymer. It was added to the polymer solution according to the molar ratio and ultrasonically mixed evenly to obtain the TPU-Cu polymer solution; after ultrasonic homogenization, the polymer solution was poured into a mold plate, placed in an oven and dried at 80 °C for 24 h to remove the solvent. After drying was completed, the mold plate was taken out, cooled to room temperature, and then the film was peeled off to obtain the TPU-Cu(0.1%) film material.

[0058] Example 7

[0059] Preparation of TPU-Cu(1%) film material:

[0060] Take the TPU polymer solution obtained in any one of Examples 1-3 in a small glass bottle, and weigh accurately CuCl 2 It was ultrasonically dispersed uniformly in DMSO, and the addition amount of Cu 2+ was 1% of the molar amount of indole in the polymer. It was added to the polymer solution according to the molar ratio and ultrasonically mixed evenly to obtain the TPU-Cu polymer solution; after ultrasonic homogenization, the polymer solution was poured into a mold plate, placed in an oven and dried at 80 °C for 24 h to remove the solvent. After drying was completed, the mold plate was taken out, cooled to room temperature, and then the film was peeled off to obtain the TPU-Cu(1%) film material.

[0061] The TPU-M polymer film materials obtained in Examples 4-7 and the TPU film material were subjected to mechanical property tests. An electronic universal testing machine with the model E44.104 was used for the mechanical property test of the film. The sensor was selected as 50 N, and the test sample was a rectangular film with 15 mm × 40 mm and a thickness of about 0.2 mm. Before the test, the length, width, and thickness data of the sample were accurately measured with a vernier caliper and a thickness gauge. The test condition was to conduct a tensile test experiment at a rate of 20 mm / min at room temperature.

[0062] As shown in the attached specification Figure 1 and 2 shown, the test results indicate that when the addition amount of Mg 2+ is 0.1%, the performance is the best, the mechanical strength is 30.8 MPa, and the elongation at break is 486%; when the addition amount of Cu 2+ is 1%, the mechanical strength is 23.1 MPa, and the elongation at break can reach 524%. It can be seen from the data that the mechanical properties of the materials obtained by the present invention are excellent.

[0063] As shown in the attachment Figure 5 shown, the principle of the enhanced performance of the materials of the present invention is as follows: Dynamic supramolecular non-covalent bonds such as hydrogen bonds and metal coordination bonds not only dissipate energy during the process of breaking and re-bonding but also ensure the integrity of the network, and undertake the intermolecular stress transfer, effectively preventing the loss of mechanical properties before the macroscopic fracture of the polymer material occurs, showing a significant enhancement and toughening effect. The cation-π interaction is considered a new type of non-covalent interaction, which has a strong interaction force and widely exists in biological systems, playing a very important role in many aspects such as molecular recognition, and the structure and function of proteins and nucleic acids. The essence of the cation-π interaction is the interaction between a positively charged cation and a molecule or compound containing a π electron cloud. The indole ring is an electron-rich aromatic ring, and when a cation approaches the π electron cloud, it is easier to form a stable cation-π interaction force. By introducing indole diol and cationic functional groups into the polyurethane backbone, a cation-π interaction between polymer chains can be successfully established, realizing the dynamic cross-linking of polymer chains. Metal ions act as cross-linking points between polymer chains. Compared with other dynamic bonds formed by supramolecular "point-to-point" such as hydrogen bonds and metal coordination bonds, the cation-π belongs to a "point-to-face" interaction. The formation range of this interaction force is expanded, and the construction is simpler and more convenient, making the cross-linking of polymer chains faster and achieving excellent enhancement and toughening effects of the materials.

[0064] An application of a thermoplastic polyurethane material. The TPU-M polymer obtained by the present invention is pre-dried and then extruded and pelletized, and can be used as a cable sheath material.

[0065] The processing method of the polyurethane raw material for the sheath material is as follows:

[0066] 1. Pre-drying

[0067] The polyurethane polymer raw material is pre-dried, and the drying conditions are 85 °C for about 3 - 4 hours.

[0068] 2. Extrusion and pelletization. Recommended processing temperature:

[0069]

[0070] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made in accordance with the shape, structure, features and spirit described in the scope of the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A thermoplastic polyurethane material, characterized in that: The thermoplastic polyurethane material is TPU-M, wherein M represents a cation, and the molecular formula of TPU is The polymerization route of the TPU is as follows: The preparation method of TPU comprises the following steps: adding isophorone diisocyanate IPDI, PEG400 and DBTDL into a double-necked flask under a nitrogen environment, performing prepolymerization at 70-90° C. for 1-2 hours, adding indole diol after the prepolymerization, diluting with DMF, the viscosity increases rapidly after the addition of indole diol, adjusting the rotation speed and adding DMF, continuing the reaction at 70-90° C. for 3-4 hours, and obtaining a TPU polymer solution after the polymerization is completed; wherein the molar feed ratio of IPDI:PEG400:indole diol is 2:1:1; The preparation method of TPU-M comprises the following steps: taking a TPU polymer solution in a small glass bottle, uniformly dispersing the chloride corresponding to the accurately weighed cation M in DMSO by ultrasonic dispersion, wherein the amount of the cation M added is 0%-1% of the molar amount of indole in the polymer, and adding the cation M to the polymer solution according to the molar ratio and uniformly mixing by ultrasonic dispersion to obtain a TPU-M polymer solution; after uniform ultrasonic dispersion, pouring the polymer solution into a mold plate, placing the solution in an oven at 80° C. and drying for 24 hours to remove the solvent, taking out the mold plate after drying, cooling it to room temperature, and peeling off the film to obtain a TPU-M film material; The synthetic route of the indolediol is as follows: The preparation method of the indolediol comprises the following steps: (1) Tryptophan protection: Weigh tert-butyldimethylsilyl chloride into a reaction bottle, add dichloromethane to completely dissolve it, and then place it in an ice bath. Add a mixed solution of imidazole and tryptophan in dichloromethane at a rate of 1-3 seconds / drop. After the addition is complete, the reaction solution is stirred at room temperature 20-25°C overnight, and then extracted with brine and ethyl acetate to obtain a tryptophan protected product; The molar ratio of tert-butyldimethylsilyl chloride: tryptophan: imidazole is 1:1:1.5-2.0; (2) Secondary protection: dissolve the tryptophan protected product in DMF under ice bath conditions, add NaH and stir for 1-1.5h, then dropwise add a mixed solution of 3-bromopropoxy-tert-butyldimethylsilane and DMF, heat to 90-110°C and react for 3-4h, then add water to the reaction flask until no bubbles are generated, extract with water and ethyl acetate, remove the upper layer solution, add anhydrous magnesium sulfate and let stand overnight, then concentrate and purify by column to obtain the tryptophan secondary protected product, the developing solvent for column is PE:EA=60:1 and 5% triethylamine; (3) Deprotection: The second protection product of the tryptophan was dissolved in tetrahydrofuran and then added with tetrabutylammonium fluoride to react at room temperature for 1-2 hours. After extraction with water and ethyl acetate, the mixture was purified by column chromatography and dried to finally obtain indolediol.

2. A method for preparing a thermoplastic polyurethane material as claimed in claim 1, characterized in that: The polymerization route of the TPU is as follows: The preparation method of TPU comprises the following steps: adding isophorone diisocyanate IPDI, PEG400 and DBTDL into a double-necked flask under a nitrogen environment, performing prepolymerization at 70-90° C. for 1-2 hours, adding indole diol after the prepolymerization, diluting with DMF, the viscosity increases rapidly after the addition of indole diol, adjusting the rotation speed and adding DMF, continuing the reaction at 70-90° C. for 3-4 hours, and obtaining a TPU polymer solution after the polymerization is completed; wherein the molar feed ratio of IPDI:PEG400:indole diol is 2:1:1; The preparation method of TPU-M comprises the following steps: taking a TPU polymer solution in a small glass bottle, uniformly dispersing the chloride corresponding to the accurately weighed cation M in DMSO by ultrasonic dispersion, wherein the amount of the cation M added is 0%-1% of the molar amount of indole in the polymer, and adding the cation M to the polymer solution according to the molar ratio and uniformly mixing by ultrasonic dispersion to obtain a TPU-M polymer solution; after uniform ultrasonic dispersion, pouring the polymer solution into a mold plate, placing the solution in an oven at 80° C. and drying for 24 hours to remove the solvent, taking out the mold plate after drying, cooling it to room temperature, and peeling off the film to obtain a TPU-M film material; The synthetic route of the indolediol is as follows: The preparation method of the indolediol comprises the following steps: (1) Tryptophan protection: Weigh tert-butyldimethylsilyl chloride into a reaction bottle, add dichloromethane to completely dissolve it, and then place it in an ice bath. Add a mixed solution of imidazole and tryptophan in dichloromethane at a rate of 1-3 seconds / drop. After the addition is complete, the reaction solution is stirred at room temperature 20-25°C overnight, and then extracted with brine and ethyl acetate to obtain a tryptophan protected product; The molar ratio of tert-butyldimethylsilyl chloride: tryptophan: imidazole is 1:1:1.5-2.0; (2) Secondary protection: dissolve the tryptophan protected product in DMF under ice bath conditions, add NaH and stir for 1-1.5h, then dropwise add a mixed solution of 3-bromopropoxy-tert-butyldimethylsilane and DMF, heat to 90-110°C and react for 3-4h, then add water to the reaction flask until no bubbles are generated, extract with water and ethyl acetate, remove the upper layer solution, add anhydrous magnesium sulfate and let stand overnight, then concentrate and purify by column to obtain the tryptophan secondary protected product, the developing solvent for column is PE:EA=60:1 and 5% triethylamine; (3) Deprotection: The second protection product of the tryptophan was dissolved in tetrahydrofuran and then added with tetrabutylammonium fluoride to react at room temperature for 1-2 hours. After extraction with water and ethyl acetate, the mixture was purified by column chromatography and dried to finally obtain indolediol.

3. The method for preparing a thermoplastic polyurethane material according to claim 2, characterized in that: The cation M is Mg 2+ 、Na + , Cu 2+ , K + One of them.

4. The method for preparing a thermoplastic polyurethane material according to claim 2, characterized in that: The preparation method of TPU comprises the following steps: adding 1.125 parts by weight of isophorone diisocyanate IPDI, 1 part by weight of PEG400 and 1.5-2 parts by weight of DBTDL into a double-necked flask under a nitrogen environment, performing prepolymerization at 70-90° C. for 1-2 hours, adding 0.274 parts by weight of indole diol after the prepolymerization, diluting with 4-24 parts by weight of DMF, the viscosity increases rapidly after the addition of indole diol, and the rotation speed needs to be adjusted and 0.8-10 parts by weight of DMF needs to be added, and the reaction is continued at 70-90° C. for 3-4 hours, and a TPU polymer solution is obtained after the polymerization is completed; wherein the molar feed ratio of IPDI:PEG400:indole diol is 2:1:

1.

5. An application of the thermoplastic polyurethane material according to claim 1, characterized in that: The TPU-M polymer is pre-dried and extruded into granules for use as a cable sheath material.

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