High-melt-strength thermoplastic polyurethane elastomer and preparation method thereof

Abstract

The invention relates to the field of wear-resistant materials, in particular to a high-melt-strength thermoplastic polyurethane elastomer and a preparation method thereof. The thermoplastic polyurethane elastomer with high melt strength is prepared from the following raw materials in parts by mass: 60 to 80 parts of a polyol agent, 25 to 40 parts of isocyanate, 6 to 12 parts of a chain extender, 5 to 15 parts of a melt reinforced composition, 3 to 6 parts of a polymerization additive, 0.05 to 0.15 part of an organic tin catalyst, 0.2 to 0.4 part of an antioxidant, 0.4 to 0.6 part of a hydrolysis stabilizer and 0.1 to 0.3 part of a coupling agent. The high-melt-strength thermoplastic polyurethane elastomer provided by the invention not only can have high melt strength, processability and mechanical properties, but also can keep good transparency, flexibility and other comprehensive properties, and the performance is prevented from being greatly sacrificed, so that the application environment of the thermoplastic polyurethane elastomer is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of anti-abrasion materials, and more particularly to a high-melt-strength thermoplastic polyurethane elastomer and a preparation method thereof. BACKGROUND

[0002] As an important high-performance polymer material, thermoplastic polyurethane elastomer (TPU) has been widely used in many fields such as automobile parts, electric wires and cables, sports equipment, medical devices and industrial products, due to its excellent elasticity of rubber and processing convenience of plastic. Its molecular structure is usually composed of alternating hard segments and soft segments, wherein the hard segments are derived from the reaction product of isocyanate and chain extender, which endows the material with rigidity and strength, while the soft segments are mainly composed of long-chain diols, which provide the material with good flexibility and elasticity. Compared with traditional thermosetting polyurethane, TPU has the advantages of high production efficiency and recyclability, and has attracted widespread attention from the industry, because it can be molded by conventional thermoplastic processing methods.

[0003] On the other hand, in application scenarios involving complex thermoforming, blow molding, extrusion coating, melt spinning, and especially foaming processing, which require the material to withstand significant tensile or expansion deformation in the molten state, the insufficient melt strength of conventional TPU has become a key bottleneck restricting its further expansion.

[0004] In the prior art, the strategies for improving the melt strength of TPU mainly focus on several directions. For example, introducing a certain degree of chemical crosslinking, adding reinforcing fillers, and compounding high-melt-strength polymers. However, these methods all have obvious shortcomings to varying degrees, such as the addition of fillers causing a sharp increase in processing viscosity, accelerated equipment wear, loss of material transparency, and decreased flexibility; and the compatibility and interfacial strength of high-melt-strength polymer compounding.

[0005] Therefore, although the prior art provides a variety of ideas for improving the melt strength of TPU, these methods generally have significant limitations, often at the expense of other properties such as transparency, processability, and mechanical properties, in order to achieve an improvement in melt strength. Therefore, at present, there is a lack of a comprehensive solution that can significantly improve the melt strength of TPU without compromising its original excellent elasticity and processing performance. SUMMARY

[0006] In summary, developing a new type of thermoplastic polyurethane elastomer with high melt strength, good processing performance and without sacrificing other properties has become a technical problem to be solved in the field of high polymer materials. Through in-depth research and development in this technical field, the applicant finally proposes a high melt strength thermoplastic polyurethane elastomer in the present application, which can not only have high melt strength, processing performance and mechanical properties, but also maintain good transparency, flexibility and other comprehensive properties, avoiding the sacrifice of performance, so as to ensure the application environment of the thermoplastic polyurethane elastomer.

[0007] A high melt strength thermoplastic polyurethane elastomer, by mass parts, raw materials include: polyol agent 60-80 parts, isocyanate 25-40 parts, chain extender 6-12 parts, melt strength composition 5-15 parts, polymer additive 3-6 parts, organic tin catalyst 0.05-0.15 parts, antioxidant 0.2-0.4 parts, hydrolysis stabilizer 0.4-0.6 parts, coupling agent 0.1-0.3 parts.

[0008] Preferably, the polyol agent is adipic acid-ethylene glycol copolyester diol and / or polycaprolactone diol.

[0009] More preferably, the polyol agent is adipic acid-ethylene glycol copolyester diol.

[0010] Preferably, the isocyanate is 4,4'-diphenyl methane diisocyanate and / or hexamethylene diisocyanate.

[0011] Most preferably, the isocyanate is 4,4'-diphenyl methane diisocyanate.

[0012] Preferably, the chain extender is at least one of 1,4-butanediol, 1,6-hexanediol, diethylene glycol and 1,4-cyclohexane dimethanol.

[0013] More preferably, the chain extender is 1,4-butanediol and / or 1,6-hexanediol.

[0014] Most preferably, the chain extender is 1,4-butanediol.

[0015] Preferably, the mass ratio of the polyol agent, isocyanate and chain extender is (60-70):(25-35):(8-11).

[0016] More preferably, the mass ratio of the polyol agent, isocyanate and chain extender is (65-70):(30-35):(8-10).

[0017] Most preferably, the mass ratio of the polyol agent, isocyanate and chain extender is 65:33:(9-9.5).

[0018] Preferably, the melt-enhancing composition is a combination of hyperbranched polyester, bisphenol F type diglycidyl ether and octadecyl phosphate.

[0019] Preferably, the mass ratio of the hyperbranched polyester, bisphenol F type diglycidyl ether and octadecyl phosphate is (4~5):(1~1.5):(2~2.5).

[0020] More preferably, the mass ratio of the hyperbranched polyester, bisphenol F type diglycidyl ether and octadecyl phosphate is (4.5~5):(1~1.2):(2~2.2).

[0021] More preferably, the hyperbranched polyester is Boltorn® H2004, BASF, Germany.

[0022] In the present application, the added melt-enhancing composition builds a dynamic reinforcing network in the polyurethane system, forms multiple physical entanglements, inhibits segment slipping in melt flow, and forms stable crosslinking with polymer chains at commonly used processing temperatures, improves elastic recovery ability, adjusts interfacial compatibility, ensures the strength of molecular chain network construction, maintains the melt strength of the material at high temperatures, significantly improves the deformation stability in foaming and deep drawing forming, and finally breaks through the application bottleneck of insufficient melt strength of traditional TPU on the premise of maintaining the flexibility of the material.

[0023] Preferably, the polymeric additive is a polyether block amide.

[0024] More preferably, the polyether block amide is PEBAX® 2533, Arkema, France.

[0025] Preferably, the mass ratio of the polyol agent, melt-enhancing composition and polymeric additive is (60~70):(8~13):(4~6).

[0026] More preferably, the mass ratio of the polyol agent, melt-enhancing composition and polymeric additive is (65~70):(9~11):(5~6).

[0027] Most preferably, the mass ratio of the polyol agent, melt-enhancing composition and polymeric additive is 65:10:5.5.

[0028] The polyether block amide, especially PEBAX® 2533, used in the present application as a key additive of high melt strength thermoplastic polyurethane elastomer, significantly improves the melt strength, flexibility and environmental durability while ensuring the inherent properties of the polyurethane elastomer. Its unique molecular chain is alternately composed of polyether soft segment and polyamide hard segment to form a molecular chain level co-action with the polyurethane matrix, improving the flexibility and low temperature performance of the material, while the hard segment micro zone forms dynamic physical crosslinking points during melt processing, significantly enhancing the melt tensile strength and elastic recovery capacity; at the same time, the compact molecular structure of the additive can disperse and penetrate the path and reduce the surface pore size, thereby improving the water vapor barrier property and environmental aging resistance, and in the processing process, the component can co-act with the epoxy melt strength enhancer in the system to build a molecular chain connection network, finally ensuring the overall performance.

[0029] Preferably, the organotin catalyst is at least one of dibutyltin dilaurate, stannous octoate and dibutyltin diacetate.

[0030] More preferably, the organotin catalyst is dibutyltin dilaurate or stannous octoate.

[0031] Most preferably, the organotin catalyst is dibutyltin dilaurate.

[0032] Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 445, antioxidant 168, antioxidant 626 and antioxidant DLTDP.

[0033] More preferably, the antioxidant is a combination of antioxidant 1076 and antioxidant DLTDP.

[0034] Preferably, the mass ratio of the antioxidant 1076 and the antioxidant DLTDP is (2-3):(0.5-1).

[0035] Preferably, the hydrolysis stabilizer is at least one of polycarbodiimide, styrene-glycidyl acrylate copolymer, aziridine derivative and polyoxazoline.

[0036] More preferably, the hydrolysis stabilizer is polycarbodiimide or aziridine derivative.

[0037] Most preferably, the hydrolysis stabilizer is polycarbodiimide.

[0038] Preferably, the coupling agent is γ-glycidoxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane or vinyltriethoxysilane.

[0039] Most preferably, the coupling agent is vinyltriethoxysilane.

[0040] The application discloses a preparation method of a high-melt-strength thermoplastic polyurethane elastomer, which comprises the following steps: S1, placing a polyol agent in a reaction kettle, dehydrating by heating until the moisture content is less than or equal to 0.1%, then adjusting the temperature to 80-90 DEG C, adding isocyanate and an organic tin catalyst, and stirring and reacting under the protection of nitrogen for 50-60 min to obtain a prepolymer; S2, cooling the prepolymer to 60-65 DEG C, adding a chain extender, a melt-strengthening composition and a coupling agent in sequence, high-speed dispersing for 8-10 min at 400-600 rpm to form a homogeneous mixture, and transferring the homogeneous mixture into a double-screw extruder to perform a chain extension reaction in a melting section at 145-160 DEG C, with a residence time of 3-4 min and a screw rotation speed of 200-240 rpm; and S3, blending and melting the remaining raw materials for 6-10 min, then performing vacuum devolatilization, cooling and granulating the extrudate after completion, and aging the extrudate in a hot air circulating oven at 70-80 DEG C for 8-10 h, with the final moisture content being less than or equal to 0.05%.

[0041] Preferably, the preparation method of the high-melt-strength thermoplastic polyurethane elastomer comprises the following steps: S1, placing a polyol agent in a reaction kettle, dehydrating by heating until the moisture content is less than or equal to 0.1%, then adjusting the temperature to 80-90 DEG C, adding isocyanate and an organic tin catalyst, and stirring and reacting under the protection of nitrogen for 50-60 min to obtain a prepolymer; S2, cooling the prepolymer to 60-65 DEG C, adding a chain extender, a melt-strengthening composition and a coupling agent in sequence, high-speed dispersing for 8-10 min at 400-600 rpm to form a homogeneous mixture, and transferring the homogeneous mixture into a double-screw extruder to perform a chain extension reaction in a melting section at 145-160 DEG C, with a residence time of 3-4 min and a screw rotation speed of 200-240 rpm; and S3, blending and melting the remaining raw materials for 6-10 min, then performing vacuum devolatilization, cooling and granulating the extrudate after completion, and aging the extrudate in a hot air circulating oven at 70-80 DEG C for 8-10 h, with the final moisture content being less than or equal to 0.05%.

[0042] The application has the following beneficial effects:

[0043] 1. The high-melt-strength thermoplastic polyurethane elastomer disclosed in the application not only has high melt strength, processing performance and mechanical performance, but also has good transparency, flexibility and other comprehensive performance, and the performance is not greatly sacrificed, so that the application environment of the thermoplastic polyurethane elastomer is ensured.

[0044] 2. The polyether block amide additive added in the application guarantees the inherent performance of the polyurethane elastomer, significantly improves the melt strength, flexibility and environmental durability, the hard segment micro area forms dynamic physical crosslinking points during melt processing, the melt tensile strength and elastic recovery ability are significantly enhanced, the dense molecular structure can disperse and penetrate the path and reduce the surface pore size, so that the water vapor barrier property and the environmental aging resistance are improved.

[0045] 3. By further adding the melt-enhancing composition in a specific combination, a dynamic reinforcing network is constructed in the polyurethane system, forming multiple physical entanglements, inhibiting segmental slippage in the melt flow, and forming stable crosslinks with the polymer chains at commonly used processing temperatures, improving the elastic recovery capability, adjusting the interfacial compatibility, ensuring the strength of the molecular chain network construction, maintaining the melt strength of the material at high temperatures, significantly improving the deformation stability in foaming and deep drawing forming, and finally breaking through the application bottleneck of insufficient melt strength of traditional TPU while maintaining the flexibility of the material. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 A physical picture of the high-melt-strength thermoplastic polyurethane elastomer prepared in Example 1 of the present application. DETAILED DESCRIPTION

[0047] Example 1

[0048] A high-melt-strength thermoplastic polyurethane elastomer, the raw materials include, by mass fraction: polyol agent 65 parts, isocyanate 33 parts, chain extender 9.2 parts, melt-enhancing composition 10 parts, polymeric additive 5.5 parts, organic tin catalyst 0.1 part, antioxidant 0.3 part, hydrolysis stabilizer 0.5 part, coupling agent 0.2 part.

[0049] The polyol agent is adipic acid-ethylene glycol copolyester diol with a number average molecular weight of 2000 Da, from the United States Stepan.

[0050] The isocyanate is 4,4'-diphenyl methane diisocyanate; the chain extender is 1,4-butanediol.

[0051] The melt-enhancing composition is a combination of hyperbranched polyester, bisphenol F type diglycidyl ether, and octadecyl phosphate ester with a mass ratio of 5:1:2.

[0052] The hyperbranched polyester is Boltorn® H2004 from Germany BASF.

[0053] The polymeric additive is polyether block amide PEBAX® 2533 from France Arkema.

[0054] The organic tin catalyst is dibutyltin dilaurate; the antioxidant is a combination of antioxidant 1076 and antioxidant DLTDP with a mass ratio of 2.2:0.8.

[0055] The hydrolysis stabilizer is polycarbodiimide PCD-50 from Shanghai Youun Chemical Industry in China; the coupling agent is vinyl triethoxysilane.

[0056] A method for preparing a high melt strength thermoplastic polyurethane elastomer, specifically comprising the following steps: S1: placing a polyol agent in a reaction kettle, dehydrating by heating until the moisture content is ≤0.1%, then adjusting the temperature to 85°C, adding isocyanate and organic tin catalyst, stirring under nitrogen protection for 60 min to obtain a prepolymer; S2: cooling the prepolymer to 65°C, adding a chain extender, a melt strength enhancing composition and a coupling agent in sequence, dispersing at 600 rpm for 10 min to form a homogeneous mixture, and transferring the homogeneous mixture into a twin-screw extruder, performing chain extension reaction in a melt section at 160°C, residence time 3 min, screw speed 200 rpm; S3: then blending and melting the remaining raw materials for 8 min, then vacuum devolatilizing, after completion, cooling and cutting the extrudate, and aging in a hot air circulating oven at 80°C for 8 h, controlling the final moisture content to ≤0.05%, and obtaining the product.

[0057] The physical product of the high melt strength thermoplastic polyurethane elastomer prepared in this example is shown in Figure 1

[0058] Example 2

[0059] A high melt strength thermoplastic polyurethane elastomer, the raw materials including, in mass parts: polyol agent 65 parts, isocyanate 33 parts, chain extender 9.2 parts, melt strength enhancing composition 10 parts, polymeric additive 5.5 parts, organic tin catalyst 0.1 part, antioxidant 0.3 part, hydrolysis stabilizer 0.5 part, coupling agent 0.2 part.

[0060] The polyol agent is polycaprolactone diol with a number average molecular weight of 2400 Da, from Hubei Chengfeng Chemical in China.

[0061] The isocyanate is hexamethylene diisocyanate; the chain extender is 1,6-hexanediol.

[0062] The melt strength enhancing composition is a combination of hyperbranched polyester, bisphenol F type diglycidyl ether and octadecyl phosphate ester, with a mass ratio of 4.2:1.3:2.5.

[0063] The hyperbranched polyester is Boltorn® H2004, from BASF in Germany.

[0064] The polymeric additive is polyether block amide PEBAX® 2533, from Arkema in France.

[0065] The organic tin catalyst is dibutyltin dilaurate; the antioxidant is a combination of antioxidant 1076 and antioxidant DLTDP, with a mass ratio of 2.2:0.8.

[0066] The hydrolysis stabilizer is polycarbodiimide PCD-50, from Youen Chemical in Shanghai, China; the coupling agent is vinyltriethoxysilane. ​

[0067] A method for preparing a high melt strength thermoplastic polyurethane elastomer, specifically comprising the following steps: S1: Put the polyol agent into the reaction kettle, dehydrate to the moisture content ≤0.1% by increasing the temperature, then adjust the temperature to 85℃, add isocyanate and organic tin catalyst, stir under nitrogen protection for 60min, get the prepolymer; S2: The prepolymer is cooled to 65℃, the chain extender, the melt strength composition and the coupling agent are added in turn, and the homogeneous mixture is formed by high-speed dispersion for 10min at 600rpm, and the homogeneous mixture is transferred into a twin-screw extruder, and the chain extension reaction is carried out in the melt section at 160℃, the residence time is 3min, and the screw speed is 200rpm; S3: Then the remaining raw materials are blended and melted for 8min, then vacuum devolatilization is carried out, after completion, the extrudate is cooled and cut, and 80℃ hot air circulation oven is used for curing for 8h, the final moisture content is controlled to ≤0.05%, and the high melt strength thermoplastic polyurethane elastomer is obtained.

[0068] Example 3

[0069] The embodiment is only different from example 1 in that a high melt strength thermoplastic polyurethane elastomer, the raw materials include, by mass fraction: polyol agent 70 parts, isocyanate 35 parts, chain extender 8 parts, melt strength composition 8 parts, polymeric additive 6 parts, organic tin catalyst 0.1 part, antioxidant 0.3 part, hydrolysis stabilizer 0.5 part, coupling agent 0.2 part.

[0070] The rest of the embodiments are the same.

[0071] Comparative example 1

[0072] The comparative example is only different from example 1 in that a high melt strength thermoplastic polyurethane elastomer, the raw materials include, by mass fraction: polyol agent 65 parts, isocyanate 33 parts, chain extender 9.2 parts, melt strength composition 2 parts, polymeric additive 5.5 parts, organic tin catalyst 0.1 part, antioxidant 0.3 part, hydrolysis stabilizer 0.5 part, coupling agent 0.2 part.

[0073] The rest of the embodiments are the same.

[0074] Comparative example 2

[0075] The comparative example is only different from example 1 in that a high melt strength thermoplastic polyurethane elastomer, the raw materials include, by mass fraction: polyol agent 65 parts, isocyanate 33 parts, chain extender 9.2 parts, melt strength composition 10 parts, polymeric additive 1.5 parts, organic tin catalyst 0.1 part, antioxidant 0.3 part, hydrolysis stabilizer 0.5 part, coupling agent 0.2 part.

[0076] The rest of the embodiments are the same.

[0077] Comparative example 3

[0078] This comparative example differs from Example 1 only in that the melt strength enhancing composition is a hyperbranched polyester, a combination of bisphenol F diglycidyl ether and octadecyl phosphate in a mass ratio of 2:2:1.

[0079] The remaining embodiments are the same.

[0080] Comparative Example 4

[0081] This comparative example differs from Example 1 only in that the melt strength enhancing composition is a hyperbranched polyester, a combination of bisphenol F diglycidyl ether and octadecyl phosphate in a mass ratio of 2:2:1.

[0082] The remaining embodiments are the same.

[0083] Comparative Example 5

[0084] This comparative example differs from Example 1 only in that the melt strength enhancing composition is a hyperbranched polyester, a combination of bisphenol F diglycidyl ether and octadecyl phosphate in a mass ratio of 8:0.5:1.5.

[0085] The remaining embodiments are the same.

[0086] Comparative Example 6

[0087] This comparative example differs from Example 1 only in that the polymeric additive is maleic anhydride grafted SEBS-FG1901 from Kraton, USA.

[0088] The remaining embodiments are the same.

[0089] Performance Testing

[0090] 1. Melt strength: tested according to standard ISO 16790, temperature 180°C, draw rate 10 mm / s, die diameter 2 mm, length to diameter ratio L / D = 10; material was milled at 180°C for 5 minutes to complete melting, a melt strand was extruded through the die and drawn at constant rate to break, the maximum tensile force was recorded, the results were averaged over 10 tests and recorded in Table 1.

[0091] 2. Tensile properties: tested according to standard ASTM D412, test temperature 60°C, humidity 75%, tensile strength and elongation at break were recorded, the results were averaged over 10 tests and recorded in Table 1.

[0092] 3. Environmental aging resistance: test according to standard ISO 4892-2, irradiance 0.55 W / m2@ 340 nm, temperature 65 °C black panel temperature, cycle 18 min / 102 min, duration 1000 h, record the subsequent tensile strength retention rate, the results are the average of 10 tests recorded in Table 1.

[0093] 4. Light transmittance: test according to standard ASTM D1003, the results are the average of 10 tests recorded in Table 1.

[0094] 5. Water resistance: test according to standard ASTM D570, prepare samples: 50 mm diameter circular sheet, soak for 24 h, dry in a 50 °C vacuum oven for 24 h before soaking, weigh after cooling, remove after soaking and absorb surface moisture with filter paper, immediately weigh, calculate the 24 h water absorption rate, the results are the average of 10 tests recorded in Table 1.

[0095] Table 1 Performance test results

[0096] Examples Melt strength (N) Tensile strength (MPa) Elongation at break (%) Environmental aging resistance (%) Transmittance (%) Water absorption (%) Example 1 0.23 38.6 502.2 88.6 91.1 1.08 Example 2 0.20 37.2 495.7 86.9 90.9 1.11 Example 3 0.22 39.2 492.6 88.2 91.5 1.15 Comparative Example 1 0.13 30.9 426.9 80.8 89.9 1.83 Comparative Example 2 0.15 31.1 455.7 82.5 90.7 1.54 Comparative Example 3 0.16 31.7 461.8 84.1 89.8 1.47 Comparative Example 4 0.16 32.4 457.1 85.6 90.1 1.66 Comparative Example 5 0.15 32.8 444.8 82.2 89.5 1.52 Comparative Example 6 0.14 30.9 460.6 81.7 90.7 1.49

[0097] From the performance test results of the final examples and comparative examples, examples 1-3 have good dynamic physical crosslinking effect, form multiple physical entanglement points, enhance the connection network, and have good interfacial compatibility and slip resistance, so that they exhibit significantly better performance than the comparative examples in multiple performance aspects. Comparative examples 1-3 do not use the appropriate raw material ratio scheme defined in the application, which directly leads to a decrease in the effect of physical crosslinking, a decrease in interfacial compatibility and slip resistance, and ultimately a significant decrease in the performance of comparative examples 1-3 in multiple performance aspects.

[0098] Comparative examples 4-6 respectively use different melt-enhancing composition schemes and polymer additive schemes from those defined in the application, which directly leads to the fact that these two raw materials cannot directly exert their best effect in the polyurethane elastomer system, which directly affects the overall performance of the polyurethane system.

Claims

1. A high melt strength thermoplastic polyurethane elastomer characterized by: The raw materials include, in parts by mass: a polyol agent 60-80, an isocyanate 25-40, a chain extender 6-12, a melt reinforcing composition 5-15, a polymeric additive 3-6, an organic tin catalyst 0.05-0.15, an antioxidant 0.2-0.4, a hydrolysis stabilizer 0.4-0.6, and a coupling agent 0.1-0.3; The polyol agent is adipic acid-ethylene glycol copolyester diol and / or polycaprolactone diol; The isocyanate is 4,4'-diphenylmethane diisocyanate and / or hexamethylene diisocyanate; The melt reinforcing composition is a combination of hyperbranched polyester, bisphenol F type diglycidyl ether and octadecyl phosphate, in a mass ratio of (4-5):(1-1.5):(2-2.5).

2. The high melt strength thermoplastic polyurethane elastomer of claim 1, wherein: The mass ratio of the polyol agent, the isocyanate and the chain extender is (60-70):(25-35):(8-11).

3. The high melt strength thermoplastic polyurethane elastomer of claim 2, wherein: The polymeric additive is a polyether block amide.

4. The high melt strength thermoplastic polyurethane elastomer of claim 3, wherein: The mass ratio of the polyol agent, the melt reinforcing composition and the polymeric additive is (60-70):(8-13):(4-6).

5. The high melt strength thermoplastic polyurethane elastomer of claim 4, wherein: The organic tin catalyst is at least one of dibutyltin dilaurate, stannous octoate and dibutyltin diacetate.

6. The high melt strength thermoplastic polyurethane elastomer of claim 5, wherein: The antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 445, antioxidant 168, antioxidant 626 and antioxidant DLTDP.

7. The high melt strength thermoplastic polyurethane elastomer according to claim 6, wherein: The hydrolysis stabilizer is at least one of polycarbodiimide, styrene-glycidyl acrylate copolymer, aziridine derivative and polyoxazoline.

8. The high melt strength thermoplastic polyurethane elastomer according to claim 7, wherein: The coupling agent is γ-glycidyl ether propyltrimethoxysilane, γ-aminopropyltriethoxysilane or vinyltriethoxysilane.

9. A process for the preparation of a high melt strength thermoplastic polyurethane elastomer according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1: placing the polyol agent in a reaction kettle, dehydrating by heating until the moisture content is ≤0.1%, then adjusting the temperature and adding the isocyanate and the organic tin catalyst, stirring and reacting under nitrogen protection to obtain a prepolymer; S2: cooling the prepolymer and sequentially adding the chain extender, the melt reinforcing composition and the coupling agent, high-speed dispersing to form a homogeneous mixture, and transferring into a twin-screw extruder to perform chain extension reaction in a melting section; S3: then blending and melting the remaining raw materials, then vacuum devolatilizing, cooling and cutting the extrudate after completion, and controlling the final moisture content to be ≤0.05% to obtain the product.

10. The method of making a high melt strength thermoplastic polyurethane elastomer of claim 9, wherein: The temperature of the melting section is 145-160°C, and the residence time of the melting section is 3-4 min.

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