Thermoplastic polyester elastomer material, process for its preparation and use

Abstract

The application provides a thermoplastic polyester elastomer material and a preparation method and application thereof, and relates to the technical field of polymer materials.The preparation raw material of the thermoplastic polyester elastomer material comprises the following components in proportion by weight: 25-40 parts of terephthalic acid, 5-20 parts of isophthalic acid, 15-33 parts of 1,4-butanediol, 0.05-0.3 parts of a composite antioxidant, 0.01-0.1 parts of magnesium acetate tetrahydrate, 0.02-0.2 parts of a branching agent, 30-55 parts of polytetrahydrofuran and 0.02-0.2 parts of a modified catalyst; wherein the composite antioxidant comprises antioxidant 1010, antioxidant 330 and tricalcium phosphate.The thermoplastic polyester elastomer material provided by the application has the advantages of high synthesis efficiency, low melting point, good anti-aging property and good supercritical foaming effect.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically, to a thermoplastic polyester elastomer material, its preparation method, and its application. Background Technology

[0002] Thermoplastic polyester elastomer (TPEE) is a type of copolymer with polybutylene terephthalate as the hard segment and polyether or polyester polyol as the soft segment. With the development of supercritical technology, its applications are becoming increasingly widespread, and it plays a significant role in footwear. Previously, commonly used materials in shoe midsoles included EVA (ethylene-vinyl acetate copolymer), TPU (thermoplastic polyurethane), and nylon. However, EVA, after foaming, is relatively soft and has slightly lower support; TPU, after foaming, is prone to yellowing if exposed to air or light for extended periods, and its support is also somewhat insufficient; nylon materials, after foaming, have good foaming ratio, resilience, and support properties, but their unit cost is high.

[0003] Furthermore, most existing shoe midsoles still utilize traditional chemical foaming technology, which can be environmentally unfriendly if not handled properly during production. Supercritical foaming technology, compared to chemical foaming, is more environmentally friendly and sustainable; however, the number of materials suitable for supercritical foaming is currently relatively limited. Compared to other materials, TPEE (Temperature Polyester Elastomer) offers more competitive cost-effectiveness and applicability, yet very few TPEE materials are suitable for supercritical foaming. Therefore, it is essential to develop a supercritical foamable TPEE material to meet current market demands. Additionally, thermoplastic polyester elastomers currently have high melting points, and their anti-aging properties, synthesis efficiency, and foaming effects need further improvement. Therefore, how to more efficiently obtain supercritical foamable thermoplastic polyester elastomers with lower melting points, better anti-aging properties, and better foaming effects has become a pressing technical problem to be solved. Summary of the Invention

[0004] The problem solved by this invention is: how to obtain thermoplastic polyester elastomer materials with low melting point, good anti-aging properties, and good foaming effect that can be supercritically foamed more efficiently.

[0005] To address the aforementioned problems, this invention provides a thermoplastic polyester elastomer material. The raw materials for preparing the thermoplastic polyester elastomer material, by weight, comprise the following components: terephthalic acid: 25 to 40 parts; isophthalic acid: 5 to 20 parts; 1,4-butanediol: 15 to 33 parts; composite antioxidant: 0.05 to 0.3 parts; magnesium acetate tetrahydrate: 0.01 to 0.1 parts; branching agent: 0.02 to 0.2 parts; polytetrahydrofuran: 30 to 55 parts; and modified catalyst: 0.02 to 0.2 parts. The composite antioxidant includes antioxidant 1010, antioxidant 330, and tricalcium phosphate; The preparation method of the modified catalyst includes: Ethyl acetate, N-phenyldiethanol, and n-butyl titanate were mixed evenly, kept at a first temperature for a first time, then cooled to a second temperature, kept at a second temperature under vacuum for a second time, and finally cooled and dried to obtain the modified catalyst.

[0006] Optionally, the mass ratio of antioxidant 1010, antioxidant 330 and tricalcium phosphate in the composite antioxidant is 1:(1.8 to 2.2):(0.19 to 0.21).

[0007] Optionally, the preparation method of the composite antioxidant includes: mixing antioxidant 1010, antioxidant 330 and tricalcium phosphate with an organic solvent until uniform, heating to 75°C to 85°C, stirring until viscous, cooling to room temperature, and then drying and grinding to obtain the composite antioxidant.

[0008] Optionally, the ethyl acetate, the N-phenyldiethanol and the n-butyl titanate are in a ratio of (1 to 5): (1 to 2): 1.

[0009] Optionally, the first temperature is 135°C to 145°C, and the first time is 1h to 2h; the second temperature is 115°C to 125°C, and the second time is 1h to 3h.

[0010] The present invention also provides a method for preparing the thermoplastic polyester elastomer material as described above, comprising: Step S1: Terephthalic acid, isophthalic acid, 1,4-butanediol, branching agent and polytetrahydrofuran are subjected to esterification reaction in the presence of composite antioxidant, magnesium acetate tetrahydrate and a first amount of modified catalyst to obtain esterification product; Step S2: Under a first vacuum condition, a second amount of the modified catalyst is added to the esterification product to carry out a pre-condensation reaction and obtain a pre-condensation product. Step S3: Under a second vacuum condition, the prepolymerization product is subjected to a polycondensation reaction to obtain a thermoplastic polyester elastomer material.

[0011] Optionally, in step S1, the temperature of the esterification reaction is 220°C to 235°C.

[0012] Optionally, in step S2, the vacuum degree of the first vacuum condition is -0.095 MPa to -0.10 MPa; and the temperature of the pre-condensation reaction is 225°C to 235°C.

[0013] Optionally, in step S3, the absolute pressure of the second vacuum condition is 45 Pa to 55 Pa; and the temperature of the polycondensation reaction is 235 °C to 245 °C.

[0014] The present invention also uses the thermoplastic polyester elastomer material as described above in the production of shoes, seats and cushions.

[0015] Compared with related technologies, this invention introduces isophthalic acid into the raw materials for the synthesis of thermoplastic polyester elastomers, thereby introducing isophthalic acid blocks into the thermoplastic polyester elastomer material. This lowers the melting point of the material while maintaining good hardness, elasticity, and relatively high melt strength, which is beneficial for its application in supercritical foaming processes. Furthermore, the modified catalyst used in this invention is obtained by modifying n-butyl titanate with N-phenyldiethanolamine. Specifically, by grafting or complexing N-phenyldiethanolamine onto n-butyl titanate, a modified catalyst is obtained. This modified catalyst not only has good resistance to hydrolysis but also excellent catalytic performance. Its application in the preparation of thermoplastic polyester elastomers can effectively improve the esterification rate of polybasic acids and polyols, thereby increasing the synthesis efficiency of thermoplastic polyester elastomers. In addition, this invention uses magnesium acetate tetrahydrate as an auxiliary catalyst in combination with the modified catalyst, which is beneficial for further improving the esterification rate of polybasic acids and polyols and also for improving the stability of thermoplastic polyester elastomers. Furthermore, the composite antioxidant used in this invention is composed of antioxidant 1010, antioxidant 330, and tricalcium phosphate. Antioxidant 1010 provides excellent antioxidant activity during the early esterification and condensation reactions, while antioxidant 330 provides excellent antioxidant activity during the mid-to-late condensation reactions. The introduction of tricalcium phosphate provides a good synergistic antioxidant effect, which is beneficial for further improving the anti-aging properties of the thermoplastic polyester elastomer material. In summary, the thermoplastic polyester elastomer material provided by this invention has high synthesis efficiency, low melting point, good anti-aging properties, and good supercritical foaming effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the preparation method of thermoplastic polyester elastomer material in an embodiment of the present invention; Figure 2 Comparative diagrams of samples obtained by supercritical foaming of thermoplastic polyester elastomer materials in Examples 2, 7, and 8 of this invention. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0019] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] The present invention provides a thermoplastic polyester elastomer material, wherein the raw materials for preparing the thermoplastic polyester elastomer material, by weight, include the following components: terephthalic acid: 25 to 40 parts, isophthalic acid: 5 to 20 parts, 1,4-butanediol: 15 to 33 parts, composite antioxidant: 0.05 to 0.3 parts, magnesium acetate tetrahydrate: 0.01 to 0.1 parts, branching agent: 0.02 to 0.2 parts, polytetrahydrofuran: 30 to 55 parts, and modified catalyst: 0.02 to 0.2 parts; The composite antioxidant includes antioxidant 1010, antioxidant 330, and tricalcium phosphate; The preparation method of the modified catalyst includes: Ethyl acetate, N-phenyldiethanol, and n-butyl titanate were mixed evenly, kept at a first temperature for a first time, then cooled to a second temperature, kept at a second temperature under vacuum for a second time, and finally cooled and dried to obtain the modified catalyst.

[0021] This invention introduces isophthalic acid into the raw materials for synthesizing thermoplastic polyester elastomers, thereby introducing isophthalic acid blocks into the material. This lowers the melting point while maintaining good hardness, elasticity, and relatively high melt strength, which is beneficial for its application in supercritical foaming processes. Furthermore, the modified catalyst used in this invention is obtained by modifying n-butyl titanate with N-phenyldiethanolamine. Specifically, the modified catalyst is obtained by grafting or complexing N-phenyldiethanolamine onto n-butyl titanate. This modified catalyst not only has good resistance to hydrolysis but also excellent catalytic performance. Its use in the preparation of thermoplastic polyester elastomers can effectively improve the esterification rate of polybasic acids and polyols, thus increasing the synthesis efficiency of thermoplastic polyester elastomers. Additionally, this invention uses magnesium acetate tetrahydrate as an auxiliary catalyst in combination with the modified catalyst, which is beneficial for further improving the esterification rate of polybasic acids and polyols and also for improving the stability of the thermoplastic polyester elastomer. Furthermore, the composite antioxidant used in this embodiment of the invention is composed of antioxidant 1010, antioxidant 330, and tricalcium phosphate. Antioxidant 1010 provides good antioxidant activity during the early esterification and condensation reactions, while antioxidant 330 provides good antioxidant activity during the mid-to-late condensation reactions. The introduction of tricalcium phosphate provides a good synergistic antioxidant effect, which is beneficial for further improving the anti-aging properties of the thermoplastic polyester elastomer material. In summary, the thermoplastic polyester elastomer material provided by this embodiment of the invention has high synthesis efficiency, low melting point, good anti-aging properties, and good supercritical foaming effect.

[0022] In some embodiments of the present invention, the mass ratio of antioxidant 1010, antioxidant 330 and tricalcium phosphate in the composite antioxidant is 1:(1.8 to 2.2):(0.19 to 0.21).

[0023] In some embodiments of the present invention, preferably, the preparation method of the composite antioxidant includes: uniformly mixing antioxidant 1010, antioxidant 330, and tricalcium phosphate with an organic solvent, heating to 75°C to 85°C, stirring until viscous, cooling to room temperature, and then drying and grinding to obtain the composite antioxidant; wherein, the organic solvent is prepared by mixing acetone and ethyl acetate in a mass ratio of (1.8 to 2.2):1, and the mass ratio of the total mass of antioxidant 1010, antioxidant 330, and tricalcium phosphate to the mass of the organic solvent is 1:(2.8 to 3.2); the drying temperature is 55°C to 65°C, and the time is 7 to 9 hours. Experiments have shown that, compared to a composite antioxidant directly mixed from antioxidant 1010, antioxidant 330, and tricalcium phosphate, the thermoplastic polyester elastomer material prepared using the composite antioxidant in this embodiment exhibits better anti-aging properties.

[0024] In some embodiments of the present invention, the ethyl acetate, the N-phenyldiethanol and the n-butyl titanate are in a ratio of (1 to 5):(1 to 2):1.

[0025] In some embodiments of the present invention, the first temperature is 135°C to 145°C, and the first time is 1h to 2h; the second temperature is 115°C to 125°C, and the second time is 1h to 3h.

[0026] In some embodiments of the present invention, the branching agent includes at least one of glycerol, diglycerol, and pentaerythritol.

[0027] In some embodiments of the present invention, the average molecular weight of the polytetrahydrofuran is 500 to 3000; preferably, the polytetrahydrofuran includes at least one of polytetrahydrofuran 1000, polytetrahydrofuran 2000 and polytetrahydrofuran 800.

[0028] like Figure 1 As shown, this embodiment of the invention also provides a method for preparing the thermoplastic polyester elastomer material as described above, comprising: Step S1: Terephthalic acid, isophthalic acid, 1,4-butanediol, branching agent and polytetrahydrofuran are subjected to esterification reaction in the presence of composite antioxidant, magnesium acetate tetrahydrate and a first amount of modified catalyst to obtain esterification product; Step S2: Under a first vacuum condition, a second amount of the modified catalyst is added to the esterification product to carry out a pre-condensation reaction and obtain a pre-condensation product. Step S3: Under a second vacuum condition, the prepolymerization product is subjected to a polycondensation reaction to obtain a thermoplastic polyester elastomer material.

[0029] In some embodiments of the present invention, the sum of the first addition amount and the second addition amount is the total amount of modified catalyst added during the preparation of thermoplastic polyester elastomer material, and the ratio of the first addition amount to the second addition amount is (3 to 8): (5 to 12).

[0030] In some embodiments of the present invention, in step S1, the temperature of the esterification reaction is 220°C to 235°C.

[0031] In some embodiments of the present invention, in step S2, the vacuum degree of the first vacuum condition is -0.095 MPa to -0.10 MPa; and the temperature of the pre-condensation reaction is 225°C to 235°C.

[0032] In some embodiments of the present invention, in step S3, the absolute pressure of the second vacuum condition is 45 Pa to 55 Pa; and the temperature of the polycondensation reaction is 235°C to 245°C.

[0033] In this embodiment of the invention, the thermoplastic polyester elastomer material described above is also used in the production of shoes, seats and cushions.

[0034] The present invention will be further described below with reference to specific embodiments.

[0035] Preparation of composite antioxidant: Antioxidant 1010, antioxidant 330, and tricalcium phosphate are mixed evenly with an organic solvent, heated to 80°C, stirred until viscous, cooled to room temperature, and then dried and ground to obtain the composite antioxidant; wherein, the mass ratio of antioxidant 1010, antioxidant 330, and tricalcium phosphate is 1:2:0.2; the organic solvent is prepared by mixing acetone and ethyl acetate in a mass ratio of 2:1, and the total mass ratio of antioxidant 1010, antioxidant 330, and tricalcium phosphate to the mass ratio of the organic solvent is 1:3; the drying temperature is 60°C and the time is 8 hours.

[0036] Preparation of the modified catalyst: Ethyl acetate, N-phenyldiethanol, and n-butyl titanate were mixed evenly, kept at a first temperature for a first time, then cooled to a second temperature, kept at a second temperature under vacuum for a second time, and finally cooled and dried to obtain the modified catalyst; the ratio of ethyl acetate, N-phenyldiethanol, and n-butyl titanate was 3:1.5:1; the first temperature was 140℃, the first time was 2h; the second temperature was 120℃, and the second time was 2h.

[0037] Example 1 A1. Esterification reaction: By weight, 29 parts of terephthalic acid, 15 parts of isophthalic acid, 24 parts of 1,4-butanediol, 0.05 parts of antioxidant, 0.02 parts of magnesium acetate tetrahydrate, and 0.06 parts of branching agent were added to the esterification reactor. The temperature was first raised to 180°C and stirring was started. The temperature was then raised to 220°C, and 0.025 parts of catalyst were added. The reaction was carried out for 1.5 hours under stirring. Then, 31 parts of polytetrahydrofuran 1000 were added. The temperature and stirring speed were kept constant, and the reaction was continued for 1 hour to obtain the esterification product. The branching agent was diglyceride.

[0038] A2. Pre-condensation reaction: Raise the temperature of the esterification reactor to 230℃, evacuate to a vacuum degree of -0.095MPa after 40min, add 0.035 parts of catalyst, keep the temperature and stirring speed constant, continue the reaction for 30min, and gradually adjust the vacuum degree of the esterification reactor to -0.10MPa during the reaction.

[0039] A3. Polycondensation reaction: The temperature of the esterification reactor is raised to 240℃, the absolute pressure of the esterification reactor is adjusted to 50Pa, the temperature is kept constant, and the reaction is stirred to obtain thermoplastic polyester elastomer material.

[0040] Wherein, the catalyst is the modified catalyst as described above, and the antioxidant is the composite antioxidant as described above.

[0041] Example 2 The difference from Example 1 is that in step A1, the amount of antioxidant added is 0.1 parts. Example 3 The difference from Example 1 is that in step A1, the amount of antioxidant added is 0.2 parts.

[0042] Example 4 The difference from Example 2 is that in step A1, the amount of catalyst added is 0.015 parts; and in step A2, the amount of catalyst added is 0.025 parts.

[0043] Example 5 The difference from Example 2 is that in step A1, the amount of catalyst added is 0.035 parts; and in step A2, the amount of catalyst added is 0.045 parts.

[0044] Example 6 The difference from Example 2 is that in step A1, the amount of catalyst added is 0.04 parts; and in step A2, the amount of catalyst added is 0.06 parts.

[0045] Example 7 The difference from Example 2 is that in step A1, the branching agent is glycerol.

[0046] Comparative Example 1 The difference from Example 2 is that the antioxidant used in step A1 is a direct mixture of antioxidant 1010, antioxidant 330 and tricalcium phosphate in a mass ratio of 1:2:0.2.

[0047] Comparative Example 2 The difference from Example 2 is that the antioxidant used in step A1 is a direct mixture of antioxidant 1010 and antioxidant 330 in a mass ratio of 1:2.

[0048] Comparative Example 3 The difference from Example 2 is that no antioxidant was added in step A1.

[0049] Comparative Example 4 The difference from Example 2 is that the catalyst used in both steps A1 and A2 is tetrabutyl titanate.

[0050] Comparative Example 5 The difference from Example 2 is that magnesium acetate tetrahydrate was not added in step A1.

[0051] Comparative Example 6 The difference from Example 2 is that no branching agent was added in step A1. Comparative Example 7 The difference from Example 2 is that in step A1, the amount of terephthalic acid added is 44 parts, and no isophthalic acid is added.

[0052] Comparative Example 8 The thermoplastic polyester elastomer material used in this comparative example is an imported product sourced from the market, and its brand name is DuPont Hytrel 4056. Effect Example The time of the polycondensation reaction in step A3 of Examples 1 to 7 and Comparative Examples 1 to 7 was statistically analyzed, and the results are shown in Table 1. The melting point, hardness, melt index change rate before and after aging, and esterification rate of the thermoplastic polyester elastomer materials prepared in Examples 1 to 7 and Comparative Examples 1 to 7 were also tested, and the results are shown in Table 1. Table 1 shows that compared with Comparative Examples 1 to 3, the melt index change rate of the thermoplastic polyester elastomer material prepared in Example 2 was lower before and after aging, indicating that the thermoplastic polyester elastomer material prepared in Example 2 had better anti-aging properties. Compared with Comparative Examples 4 and 5, the thermoplastic polyester elastomer material prepared in Example 2 had a higher esterification rate and a shorter polycondensation reaction time. Compared with Example 2, the polycondensation reaction time in Comparative Example 6 was significantly increased due to the absence of a branching agent. Compared with Example 2, the branching agent used in Example 7 was glycerol, resulting in a slight increase in the polycondensation reaction time. Compared with Example 2, the hardness and melting point of the thermoplastic polyester elastomer material prepared in Comparative Example 7 were significantly improved. Compared with Comparative Example 8, the foaming ratio of the thermoplastic polyester elastomer material prepared in Example 2 is similar; compared with Comparative Example 7, the foaming ratio of the thermoplastic polyester elastomer material prepared in Example 2 is larger, indicating that the foaming performance of the thermoplastic polyester elastomer material prepared in Example 2 is better.

[0053] Table 1

[0054] The thermoplastic polyester elastomer materials from Examples 2, 7, and 8 were subjected to supercritical foaming, and the foamed samples were as follows: Figure 2 As shown in Table 2, the foaming ratio and resilience of the samples were statistically analyzed. Table 2 shows that, compared with Comparative Example 7, the foaming ratio and resilience of the thermoplastic polyester elastomer material prepared in Example 2 increased significantly; compared with Comparative Example 8, the foaming ratio and resilience of the thermoplastic polyester elastomer material prepared in Example 2 increased slightly; indicating that the thermoplastic polyester elastomer material prepared in Example 2 has better foaming performance.

[0055] Table 2

[0056] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A thermoplastic polyester elastomer material, characterized in that, The raw materials for preparing the thermoplastic polyester elastomer material, by weight, include the following components: terephthalic acid: 25 to 40 parts, isophthalic acid: 5 to 20 parts, 1,4-butanediol: 15 to 33 parts, composite antioxidant: 0.05 to 0.3 parts, magnesium acetate tetrahydrate: 0.01 to 0.1 parts, branching agent: 0.02 to 0.2 parts, polytetrahydrofuran: 30 to 55 parts, and modified catalyst: 0.02 to 0.2 parts; The composite antioxidant includes antioxidant 1010, antioxidant 330, and tricalcium phosphate; The preparation method of the modified catalyst includes: Ethyl acetate, N-phenyldiethanol, and n-butyl titanate were mixed evenly, kept at a first temperature for a first time, then cooled to a second temperature, kept at a second temperature under vacuum for a second time, and finally cooled and dried to obtain the modified catalyst.

2. The thermoplastic polyester elastomer material according to claim 1, characterized in that, The mass ratio of antioxidant 1010, antioxidant 330 and tricalcium phosphate in the composite antioxidant is 1:(1.8 to 2.2):(0.19 to 0.21).

3. The thermoplastic polyester elastomer material according to claim 1, characterized in that, The preparation method of the composite antioxidant includes: mixing antioxidant 1010, antioxidant 330 and tricalcium phosphate with an organic solvent, heating to 75°C to 85°C, stirring until viscous, cooling to room temperature, and then drying and grinding to obtain the composite antioxidant.

4. The thermoplastic polyester elastomer material according to claim 1, characterized in that, The ethyl acetate, the N-phenyldiethanol and the n-butyl titanate are in a ratio of (1 to 5): (1 to 2):

1.

5. The thermoplastic polyester elastomer material according to claim 1, characterized in that, The first temperature is 135°C to 145°C, and the first time is 1 hour to 2 hours; the second temperature is 115°C to 125°C, and the second time is 1 hour to 3 hours.

6. A method for preparing a thermoplastic polyester elastomer material as described in any one of claims 1 to 5, characterized in that, include: Step S1: Terephthalic acid, isophthalic acid, 1,4-butanediol, branching agent and polytetrahydrofuran are subjected to esterification reaction in the presence of composite antioxidant, magnesium acetate tetrahydrate and a first amount of modified catalyst to obtain esterification product; Step S2: Under a first vacuum condition, a second amount of the modified catalyst is added to the esterification product to carry out a pre-condensation reaction and obtain a pre-condensation product. Step S3: Under a second vacuum condition, the prepolymerization product is subjected to a polycondensation reaction to obtain a thermoplastic polyester elastomer material.

7. The method for preparing the thermoplastic polyester elastomer material according to claim 6, characterized in that, In step S1, the temperature of the esterification reaction is 220°C to 235°C.

8. The method for preparing the thermoplastic polyester elastomer material according to claim 6, characterized in that, In step S2, the vacuum degree of the first vacuum condition is -0.095MPa to -0.10MPa; the temperature of the pre-condensation reaction is 225℃ to 235℃.

9. The method for preparing the thermoplastic polyester elastomer material according to claim 6, characterized in that, In step S3, the absolute pressure of the second vacuum condition is 45 Pa to 55 Pa; the temperature of the polycondensation reaction is 235 °C to 245 °C.

10. The thermoplastic polyester elastomer material according to any one of claims 1 to 5 is used in the production of shoes, seats and cushions.

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