A polyester elastomer and its preparation method and application

Abstract

The present application relates to the technical field of polyester materials, and specifically discloses a polyester elastomer and its preparation method and application. The polyester elastomer disclosed in the present application includes the following components in parts by weight: 40-60 parts of terephthalic acid, 100-140 parts of 1,4-butanediol, 10-20 parts of polyether diol, 0.2-0.8 parts of tetrabutyl titanate, 3-7 parts of catalyst, 0.1-0.3 parts of antioxidant, 0.4-1.2 parts of auxiliary agent, and 0.7-1.3 parts of composite rubber; the auxiliary agent is selected from acrylic anhydride / adipic acid / dipropylene glycol terpolymer and maleic anhydride / adipic acid / dipropylene glycol terpolymer; the composite rubber is obtained by treating DY5010 latex powder, DY5020 rubber powder and aluminum-titanium composite coupling agent in a weight ratio of 10-15:10-15:1-3. The polyester elastomer prepared using the raw materials provided in the present application has excellent mechanical properties, elastic properties, low temperature resistance and heat resistance.

Description

Technical Field

[0001] The present application relates to the technical field of polyester elastomers, and in particular to a polyester elastomer and a preparation method and application thereof. Background Art

[0002] Thermoplastic polyester elastomer (TPEE) is a block copolymer containing polyester hard segments and polyether soft segments; the polyether soft segments and uncrystallized polyester form an amorphous phase, and the polyester hard segments partially crystallize to form crystalline micro-regions, which act as physical crosslinking points. TPEE has the elasticity of rubber and the strength of engineering plastics; the soft segments give it elasticity, making it like rubber; the hard segments give it processing properties, making it like plastic; compared with rubber, TPEE has better processing properties and longer service life; compared with engineering materials, it also has the characteristics of high strength, but better flexibility and dynamic mechanical properties.

[0003] Thermoplastic polyester elastomers can be applied to spinning and further prepared into elastic mesh fabrics, such as the elastic mesh fabrics for the back or cushion of computer chairs and the uppers of sports shoes. However, this material is prone to breakage or fuzzing, and has poor low-temperature resistance, which limits its application. Summary of the invention

[0004] In order to improve the elasticity and low temperature resistance of polyester elastomer materials, the present application provides a polyester elastomer and a preparation method and application thereof.

[0005] The present application provides a mesh for a computer chair or a sports shoe upper, wherein the mesh has a tensile strength of ≥61.8 Mpa, a bending modulus of ≥223.0 Gpa, and an impact strength of ≥55.6 kJ / m at -15°C. 2 , heat deformation temperature ≥123.8℃.

[0006] The present application provides a polyester elastomer, which is used to prepare the mesh fabric of the computer chair or sports shoe upper. The polyester elastomer specifically comprises the following components in parts by weight: 40-60 parts of terephthalic acid, 100-140 parts of 1,4-butanediol, 10-20 parts of polyether diol, 0.2-0.8 parts of tetrabutyl titanate, 3-7 parts of catalyst, 0.1-0.3 parts of antioxidant, 0.4-1.2 parts of auxiliary agent, and 0.7-1.3 parts of composite rubber;

[0007] The auxiliary agent is selected from any one or two of acrylic anhydride / adipic acid / dipropylene glycol terpolymer and maleic anhydride / adipic acid / dipropylene glycol terpolymer;

[0008] The composite rubber material is obtained by treating a mixture of DY5010 latex powder, DY5020 rubber powder and titanate coupling agent in a weight ratio of 10-15:10-15:1-3, and is heat-insulated and activated in a water bath at 60-70°C for 6-10 hours.

[0009] The present application adopts the above-mentioned technical scheme, and uses specific weight parts of terephthalic acid, 1,4-butanediol, polyether diol, tetrabutyl titanate, catalyst, antioxidant, additive, and composite rubber as raw materials. The prepared polyester elastomer has high tensile strength, flexural modulus, impact performance and heat deformation temperature. That is, the raw materials provided by the present application can be used to obtain a polyester elastomer with excellent mechanical properties, good elastic properties, good low temperature resistance and good heat resistance.

[0010] During the test process of the present application, the applicant obtained through a large number of creative experiments that when the modified composite rubber and acrylic anhydride / adipic acid / dipropylene glycol terpolymer or maleic anhydride / adipic acid / dipropylene glycol terpolymer are added to the modified polyester system, further cross-linking will occur between the raw materials in the molten state, thereby reducing the liquid phase supersaturation of the mixture. During the co-condensation process, the intermolecular forces can be changed, the crystallinity of the modified polyester molecules can be improved, and the glass transition temperature of the polyester molecules can be reduced, thereby improving the low-temperature resistance, impact resistance and heat resistance of the polyester molecules.

[0011] Preferably, the polyester elastomer specifically comprises the following components in parts by weight: 44-52 parts of terephthalic acid, 120-130 parts of 1,4-butanediol, 13-18 parts of polyether diol, 0.4-0.6 parts of tetrabutyl titanate, 4-6 parts of catalyst, 0.15-0.25 parts of antioxidant, 0.6-1.0 parts of auxiliary agent, and 0.9-1.1 parts of modified filler.

[0012] Preferably, the auxiliary agent is an acrylic anhydride / adipic acid / dipropylene glycol terpolymer, and the preparation method of the acrylic anhydride-polyethylene binary copolymer is as follows: add dicumyl peroxide to acrylic anhydride, grind to make it fully mixed; then add adipic acid and dipropylene glycol, react at room temperature for 60-90 minutes, and then extrude at 220-250°C to obtain the acrylic anhydride / adipic acid / dipropylene glycol terpolymer, and the weight ratio of the acrylic anhydride, the dicumyl peroxide, the adipic acid, and the dipropylene glycol is 8-12:0.1-0.5:3-7:3-7.

[0013] Through experimental analysis, it can be known that the present application selects acrylic anhydride / adipic acid / dipropylene glycol terpolymer and maleic anhydride / adipic acid / dipropylene glycol terpolymer as raw material additives, which can effectively improve the comprehensive performance of polyester elastomers.

[0014] Preferably, the weight ratio of the acrylic anhydride, the dicumyl peroxide, the adipic acid, and the dipropylene glycol is 9-11:0.2-0.4:5-7:3-5.

[0015] Through experimental analysis, it can be known that the present application selects the raw materials in the above weight ratio to prepare acrylic anhydride / adipic acid / dipropylene glycol terpolymer as a raw material auxiliary agent, which can further improve the low temperature resistance and heat resistance of the polyester elastomer.

[0016] Preferably, in the composite rubber material, the amount of the DY5010 latex powder is less than the amount of the DY5020 latex powder.

[0017] Through experimental analysis, it can be known that the present application uses a mixture of DY5010 latex powder, DY5020 rubber powder and titanate coupling agent with a weight ratio of 10-15:10-15:1-3 as a composite rubber material after activation treatment, which can effectively improve the comprehensive performance of the polyester elastomer. Furthermore, the present application controls the amount of DY5010 latex powder to be less than the amount of DY5020 rubber powder, which can further improve the mechanical properties, elastic properties and low temperature resistance of the polyester elastomer.

[0018] Preferably, the catalyst is selected from one or more of acetate, monobutyltin triisooctoate, dioctyltin oxide, tetrabutyl titanate, isopropyl titanate, and N-hydroxysuccinimide.

[0019] Furthermore, the catalyst is composed of a mixture of acetate and N-hydroxysuccinimide in a weight ratio of 9:2-5.

[0020] In a specific embodiment, the weight ratio of the acetate to N-hydroxysuccinimide can be 9:2, 9:4, or 9:5.

[0021] In some specific embodiments, the weight ratio of the acetate to N-hydroxysuccinimide can also be 9:2-4 or 9:4-5.

[0022] Through experimental analysis, it can be known that the present application selects the above-mentioned weight ratio of acetate and N-hydroxysuccinimide to mix and form a catalyst, which can further improve the comprehensive performance of the polyester elastomer.

[0023] Furthermore, the acetate is selected from one or more of zinc acetate, calcium acetate and magnesium acetate.

[0024] Preferably, the polyether diol is selected from one or more of polytetramethylene ether glycol and polytetramethylene ether glycol.

[0025] Preferably, the antioxidant is selected from one or more of hindered phenol antioxidants, hindered amine antioxidants, phosphite antioxidants, inorganic phosphate antioxidants, and thioester antioxidants.

[0026] On the other hand, the present application provides a method for preparing the above polyester elastomer, which specifically comprises the following steps:

[0027] Weigh each raw material by weight, and mix and disperse it in a high-speed disperser to obtain a premix; 20-40 rpm, temperature control at 25-70°C, mixing time 12-72h;

[0028] Transferring the premix to a twin-screw extruder for granulation to obtain the polyester elastomer;

[0029] The extrusion temperature of the twin-screw extruder is 200-250°C, the screw speed is 60-120r / min, the screw aspect ratio is 40-64, and the vacuum degree is ≤0.04MPa.

[0030] In summary, the technical solution of this application has the following effects:

[0031] The present application utilizes specific weight portions of terephthalic acid, 1,4-butanediol, polyether diol, tetrabutyl titanate, catalyst, antioxidant, additive, and composite rubber as raw materials for preparing polyester elastomers, and can obtain materials with higher tensile strength, flexural modulus, impact properties, and heat deformation temperature.

[0032] The present application further improves the comprehensive performance of the polyester elastomer by screening the types of composite rubber, additives and catalysts. DETAILED DESCRIPTION

[0033] DY5010 latex powder and DY5020 latex powder were purchased from Guangzhou Yuanye Industrial Co., Ltd.; titanate coupling agent was purchased from Henan Jiyuan Kehui Materials Co., Ltd., and the remaining raw materials were commercially available.

[0034] The present application is further described in detail below in conjunction with examples, comparative examples and performance testing experiments. These examples should not be construed as limiting the scope of protection claimed in the present application.

[0035] Example

[0036] Examples 1-3

[0037] Examples 1-3 each provide a polyester elastomer.

[0038] The difference between the above embodiments is that the dosage of each raw material component in the polyester elastomer is different, as shown in Table 1.

[0039] The preparation method of the polyester elastomer in the above embodiment is specifically as follows:

[0040] Preparation of auxiliary agent: add 0.3g of dicumyl peroxide to 10g of acrylic anhydride, grind to make it fully mixed; then add 7g of adipic acid and 5g of dipropylene glycol, react for 75min at room temperature, and then extrude at 230°C to obtain the auxiliary agent; the weight ratio of acrylic anhydride, dicumyl peroxide, adipic acid and dipropylene glycol is 10:0.3:7:5.

[0041] Preparation of composite rubber: 10g DY5010 latex powder, 13g DY5020 rubber powder and 2g aluminum-titanium composite coupling agent were weighed respectively, and the mixture was activated by heat preservation at 65°C in a water bath for 8h to obtain a composite rubber.

[0042] Preparation of polyester elastomer:

[0043] According to Table 1, the raw material components were weighed respectively, and the mixture of terephthalic acid, 1,4-butanediol, polyether diol (polytetramethylene glycol), tetrabutyl titanate, catalyst (mixed with zinc acetate and N-hydroxysuccinimide in a weight ratio of 9:4), antioxidant (phosphite antioxidant 168), auxiliary agent, and composite rubber was preliminarily mixed and dispersed in a high-speed disperser to obtain a premix;

[0044] The premix is ​​transferred to a twin-screw extruder for extrusion, wherein the extrusion temperature of the twin-screw extruder is 230° C., the screw speed is 90 r / min, the screw aspect ratio is 52, and the vacuum degree is ≤0.04 MPa; the premix is ​​cooled by water, air-dried, pelletized, and dried to obtain a polyester elastomer.

[0045] Table 1 Amount of each raw material component in the polyester elastomer in Examples 1-3

[0046]

[0047] Embodiment 4-9

[0048] Examples 4-9 each provide a polyester elastomer.

[0049] The difference between the above embodiment and embodiment 2 is that the preparation method of the auxiliary agent is different, as shown below.

[0050] In Example 4: 0.3 g of dicumyl peroxide was added to 10 g of maleic anhydride, and the mixture was ground to be fully mixed; then 7 g of adipic acid and 5 g of dipropylene glycol were added, and the mixture was reacted at room temperature for 75 min, and then extruded at 230° C. to obtain an auxiliary agent; the weight ratio of maleic anhydride, dicumyl peroxide, adipic acid, and dipropylene glycol was 10:0.3:7:5.

[0051] In Example 5: 0.3 g of dicumyl peroxide was added to 8 g of acrylic anhydride, and the mixture was ground to be fully mixed; then 8 g of adipic acid and 2 g of dipropylene glycol were added, and the mixture was reacted at room temperature for 75 min, and then extruded at 230° C. to obtain an auxiliary agent; the weight ratio of acrylic anhydride, dicumyl peroxide, adipic acid, and dipropylene glycol was 8:0.3:8:2.

[0052] In Example 6: 0.5 g of dicumyl peroxide was added to 8 g of acrylic anhydride, and the mixture was ground to be fully mixed; then 3 g of adipic acid and 5 g of dipropylene glycol were added, and the mixture was reacted at room temperature for 75 min, and then extruded at 230°C to obtain an auxiliary agent; the weight ratio of acrylic anhydride, dicumyl peroxide, adipic acid and dipropylene glycol was 8:0.5:3:5.

[0053] In Example 7: 0.1 g of dicumyl peroxide was added to 12 g of acrylic anhydride, and the mixture was ground to be thoroughly mixed; then 5 g of adipic acid and 7 g of dipropylene glycol were added, and the mixture was reacted at room temperature for 75 min, and then extruded at 230° C. to obtain an auxiliary agent; the weight ratio of acrylic anhydride, dicumyl peroxide, adipic acid, and dipropylene glycol was 12:0.1:5:7.

[0054] In Example 8: 0.2 g of dicumyl peroxide was added to 9 g of acrylic anhydride, and the mixture was ground to be fully mixed; then 5 g of adipic acid and 3 g of dipropylene glycol were added, and the mixture was reacted at room temperature for 75 min, and then extruded at 230°C to obtain an auxiliary agent; the weight ratio of acrylic anhydride, dicumyl peroxide, adipic acid and dipropylene glycol was 9:0.2:5:3.

[0055] In Example 9: 0.4 g of dicumyl peroxide was added to 11 g of acrylic anhydride, and the mixture was ground to be thoroughly mixed; then 7 g of adipic acid and 3 g of dipropylene glycol were added, and the mixture was reacted at room temperature for 75 min, and then extruded at 230°C to obtain an auxiliary agent; the weight ratio of acrylic anhydride, dicumyl peroxide, adipic acid, and dipropylene glycol was 11:0.4:7:3.

[0056] The remaining raw materials, the amounts of the raw material components and the preparation method of the polyester elastomer in the above example are the same as those in Example 2.

[0057] Examples 10-13

[0058] Examples 10-13 each provide a polyester elastomer.

[0059] The difference between the above embodiment and embodiment 2 is that the preparation method of the composite rubber material is different, as shown below.

[0060] In Example 10: 15 g of DY5010 latex powder, 13 g of DY5020 rubber powder and 2 g of aluminum-titanium composite coupling agent were weighed respectively, and the mixture was activated by heat preservation in a water bath at 65° C. for 8 h to obtain a composite rubber material.

[0061] In Example 11: 13 g of DY5010 latex powder, 10 g of DY5020 rubber powder and 2 g of aluminum-titanium composite coupling agent were weighed respectively, and the mixture was activated by heat preservation at 65° C. in a water bath for 8 h to obtain a composite rubber material.

[0062] In Example 12: 10 g of DY5010 latex powder, 15 g of DY5020 rubber powder and 2 g of aluminum-titanium composite coupling agent were weighed respectively, and the mixture was activated by heat preservation at 65° C. in a water bath for 8 h to obtain a composite rubber material.

[0063] In Example 13: 13 g of DY5010 latex powder, 15 g of DY5020 rubber powder and 2 g of aluminum-titanium composite coupling agent were weighed respectively, and the mixture was activated by heat preservation at 65° C. in a water bath for 8 h to obtain a composite rubber material.

[0064] The remaining raw materials, the amounts of the raw material components and the preparation method of the polyester elastomer in the above example are the same as those in Example 2.

[0065] Examples 14-17

[0066] Examples 14-17 each provide a polyester elastomer.

[0067] The difference between the above embodiment and embodiment 2 is that the types of catalysts are different, as shown below.

[0068] The remaining raw materials, the amounts of the raw material components and the preparation method of the polyester elastomer in the above example are the same as those in Example 2.

[0069] In Example 14: the catalyst is N-hydroxysuccinimide.

[0070] In Example 15: the catalyst is composed of a mixture of zinc acetate and tetrabutyl titanate in a weight ratio of 9:4.

[0071] In Example 16: the catalyst is composed of a mixture of dioctyltin oxide and N-hydroxysuccinimide in a weight ratio of 9:4.

[0072] In Example 17: the catalyst is composed of a mixture of zinc acetate and N-hydroxysuccinimide in a weight ratio of 9:2.

[0073] The remaining raw materials, the amounts of the raw material components and the preparation method of the polyester elastomer in the above example are the same as those in Example 2.

[0074] Comparative Example

[0075] Comparative Example 1-2

[0076] Comparative Examples 1-2 respectively provide a polyester elastomer.

[0077] The difference between the comparative example and Example 2 is that the amounts of the raw material components in the polyester elastomer are different, as shown in Table 1.

[0078] The remaining raw materials, the amounts of the raw material components and the preparation method of the polyester elastomer in the above comparative example are the same as those in Example 2.

[0079] Comparative Examples 3-6

[0080] Comparative Examples 3-6 each provide a polyester elastomer.

[0081] The difference between the above comparative example and Example 2 is as follows.

[0082] In Comparative Example 3: terephthalic acid is replaced by an equal amount of 2,6-naphthalenedicarboxylic acid.

[0083] In Comparative Example 4: an equal amount of isopropyl titanate was used instead of tetrabutyl titanate.

[0084] In Comparative Example 5: The preparation method of the auxiliary agent is as follows: 0.3 g of diisopropylbenzene peroxide is added to 10 g of acrylic anhydride, and the mixture is ground to be fully mixed; then 12 g of propylene is added, and the mixture is reacted at room temperature for 75 minutes, and then extruded at 230°C to obtain an acrylic anhydride-propylene binary copolymer.

[0085] In Comparative Example 6: Preparation of composite rubber: 10 g of montmorillonite, 13 g of DY5020 rubber powder and 2 g of titanate coupling agent were weighed respectively, and the mixture was treated by heat preservation and activation at 65° C. in a water bath for 8 h to obtain a composite rubber.

[0086] The remaining raw materials, the amounts of the raw material components and the preparation method of the polyester elastomer in the above comparative example are the same as those in Example 2.

[0087] Performance testing

[0088] Tensile strength: tested according to the test method specified in ASTMD 638.

[0089] Flexural modulus: tested according to the test method specified in ASTM D 790.

[0090] Impact performance: The impact strength of the sample at -15°C was tested according to the test method specified in ASTM D 256.

[0091] Heat deformation temperature: The impact strength of the sample under 1.82MPa condition is tested according to the test method specified in ASTMD 648.

[0092] Test results: as shown in Table 2.

[0093] Table 2 Performance test results of polyester elastomers in Examples 1-13 and Comparative Examples 1-6

[0094]

[0095]

[0096] Combined with Table 2, by comparing the test results of Examples 1-17 with Comparative Examples 1-6, the present application uses specific weight parts of terephthalic acid, 1,4-butanediol, polyether diol, tetrabutyl titanate, catalyst, antioxidant, additive, and composite rubber as raw materials to prepare a polyester elastomer having high tensile strength, flexural modulus, impact performance and heat deformation temperature. The above test results show that the raw materials provided by the present application can be used to obtain a polyester elastomer with excellent mechanical properties, good elastic properties, good low temperature resistance and good heat resistance.

[0097] By comparing the test results of Examples 1-3 with those of Comparative Examples 1-2, it can be seen that the amount of each raw material component has a great influence on the performance of the polyester elastomer. The present application effectively ensures the comprehensive performance of the polyester elastomer by controlling the specific amount of each raw material component.

[0098] In Comparative Example 3, 2,6-naphthalene dicarboxylic acid was used instead of terephthalic acid, and the tensile strength, bending modulus and heat deformation temperature of the prepared polyester elastomer were poor. In Comparative Example 4, isopropyl titanate was used instead of tetrabutyl titanate, and the tensile strength, bending modulus and low-temperature impact performance of the prepared polyester elastomer were poor.

[0099] By comparing the test results of Examples 2, 4-9 with Comparative Example 5, the present application selects acrylic anhydride / adipic acid / dipropylene glycol terpolymers and maleic anhydride / adipic acid / dipropylene glycol terpolymers as raw material additives, which can effectively improve the comprehensive performance of polyester elastomers. Further, the present application uses acrylic anhydride, dicumyl peroxide, adipic acid, and dipropylene glycol in a weight ratio of 8-12: 0.1-0.5: 3-7: 3-7 to prepare acrylic anhydride / adipic acid / dipropylene glycol terpolymers, which can further improve the low temperature resistance and heat resistance of polyester elastomers.

[0100] By comparing the test results of Examples 1, 10-13 and Comparative Example 6, the present application uses a mixture of DY5010 latex powder, DY5020 rubber powder and titanate coupling agent with a weight ratio of 10-15:10-15:1-3 as a composite rubber material after activation treatment, which can effectively improve the comprehensive performance of the polyester elastomer. Furthermore, the present application controls the amount of DY5010 latex powder to be less than the amount of DY5020 rubber powder, which can further improve the mechanical properties, elastic properties and low temperature resistance of the polyester elastomer.

[0101] By comparing the test results of Examples 1 and 14-17, the present application selects acetate and N-hydroxysuccinimide in a weight ratio of 9:2-5 to form a catalyst, which can further improve the comprehensive performance of the polyester elastomer.

[0102] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A polyester elastomer, characterized in that: The raw materials of the polyester elastomer specifically include the following components in parts by weight: 40-60 parts of terephthalic acid, 100-140 parts of 1,4-butanediol, 10-20 parts of polyether diol, 0.2-0.8 parts of tetrabutyl titanate, 3-7 parts of catalyst, 0.1-0.3 parts of antioxidant, 0.4-1.2 parts of auxiliary agent, and 0.7-1.3 parts of composite rubber; The auxiliary agent is selected from any one or two of acrylic anhydride / adipic acid / dipropylene glycol terpolymer and maleic anhydride / adipic acid / dipropylene glycol terpolymer; The composite rubber material is obtained by treating a mixture of DY5010 latex powder, DY5020 rubber powder and titanate coupling agent in a weight ratio of 10-15:10-15:1-3, and activating the mixture in a water bath at 60-70°C for 6-10 hours. The preparation method of the polyester elastomer specifically comprises the following steps: Weigh each raw material by weight, and mix and disperse it in a high-speed disperser to obtain a premix; 20-40 rpm, temperature control at 25-70°C, mixing time 12-72h; Transferring the premix to a twin-screw extruder for granulation to obtain the polyester elastomer; The extrusion temperature of the twin-screw extruder is 200-250°C, the screw speed is 60-120r / min, the screw aspect ratio is 40-64, and the vacuum degree is ≤0.04MPa.

2. The polyester elastomer according to claim 1, characterized in that The raw materials of the polyester elastomer specifically include the following components in parts by weight: 44-52 parts of terephthalic acid, 120-130 parts of 1,4-butanediol, 13-18 parts of polyether diol, 0.4-0.6 parts of tetrabutyl titanate, 4-6 parts of catalyst, 0.15-0.25 parts of antioxidant, 0.6-1.0 parts of auxiliary agent, and 0.9-1.1 parts of modified filler.

3. The polyester elastomer according to claim 1, characterized in that The auxiliary agent is an acrylic anhydride / adipic acid / dipropylene glycol terpolymer, and the preparation method of the acrylic anhydride / adipic acid / dipropylene glycol terpolymer is as follows: add dicumyl peroxide to acrylic anhydride, grind to make it fully mixed; then add adipic acid and dipropylene glycol, react for 60-90 minutes at room temperature, and then extrude at 220-250° C. to obtain the acrylic anhydride / adipic acid / dipropylene glycol terpolymer, wherein the weight ratio of the acrylic anhydride, the dicumyl peroxide, the adipic acid, and the dipropylene glycol is 8-12: 0.1-0.5：3-7：3-7。 4. The polyester elastomer according to claim 3, characterized in that The weight ratio of the acrylic anhydride, the dicumyl peroxide, the adipic acid and the dipropylene glycol is 9-11:0.2-0.4:5-7:3-5.

5. The polyester elastomer according to claim 1, characterized in that In the composite rubber material, the amount of the DY5010 latex powder is less than the amount of the DY5020 latex powder.

6. The polyester elastomer according to claim 1, characterized in that The catalyst is selected from one or more of acetate, monobutyltin triisooctoate, dioctyltin oxide, tetrabutyl titanate, isopropyl titanate, and N-hydroxysuccinimide.

7. The polyester elastomer according to claim 1, characterized in that The catalyst is composed of acetate and N-hydroxysuccinimide mixed in a weight ratio of 9:2-5.

8. The polyester elastomer according to claim 1, characterized in that The antioxidant is selected from one or more of hindered phenol antioxidants, hindered amine antioxidants, phosphite antioxidants, inorganic phosphate antioxidants, and thioester antioxidants.

9. The method for preparing a polyester elastomer according to any one of claims 1 to 8, characterized in that: The specific steps include: Weigh each raw material by weight, and mix and disperse it in a high-speed disperser to obtain a premix; 20-40 rpm, temperature control at 25-70°C, mixing time 12-72h; Transferring the premix to a twin-screw extruder for granulation to obtain the polyester elastomer; The extrusion temperature of the twin-screw extruder is 200-250°C, the screw speed is 60-120r / min, the screw aspect ratio is 40-64, and the vacuum degree is ≤0.04MPa.

10. A mesh fabric for computer chairs or sports shoes uppers, characterized in that: The mesh is prepared using the polyester elastomer according to claim 1; the polyester elastomer has a tensile strength of ≥61.8Mpa, a bending modulus of ≥223.0Mpa, and an impact strength of ≥55.6kJ / m at -15°C 2 , heat deformation temperature ≥123.8℃.

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