Polyamide elastomer as well as preparation method and application thereof

Abstract

The invention provides a polyamide elastomer as well as a preparation method and application thereof. The preparation method comprises the following step: carrying out polymerization reaction on polyether glycol, polycaprolactone polyol and carboxyl-terminated polyamide prepolymer according to the weight ratio of (85-20): (0.1-10): (20-85) to obtain the polyamide elastomer. The polyamide elastomer prepared by the method has excellent permanent compression deformation, so that the polyamide elastomer can be better applied to the fields of new energy automobile battery gaskets and the like.

Description

Technical Field

[0001] This invention relates to a polyamide elastomer, its preparation method and application, and belongs to the field of polyamide synthesis technology. Background Technology

[0002] Thermoplastic polyamide elastomers are a type of segmented block copolymer, belonging to the thermoplastic elastomer family. They are typically synthesized by the condensation polymerization of hard polyamide segments and soft polyether or polyester segments. Polyamide thermoplastic elastomers (TPAEs) are a member of the thermoplastic elastomer family, but their preparation and application started relatively late compared to widely used thermoplastic polyurethane elastomers (TPUs), thermoplastic polyolefin elastomers (TPOs), styrene thermoplastic elastomers (SBCs), thermoplastic polyvinyl chloride elastomers (TPVCs), and thermoplastic polyether ester elastomers (TPEEs). Polyamide thermoplastic elastomers (TPAEs) can be classified into Nylon 6, Nylon 12, and Nylon 66 types, depending on the hard segment. Currently, polyamide elastomers are mainly used in automobiles, machinery, electronics, precision electrical instruments, and sporting goods.

[0003] Currently, thermoplastic polyamide elastomers can be prepared in the following ways: For example, patent CN115746548A discloses a flame-retardant polyamide elastomer material, its preparation method, and its uses. The flame-retardant polyamide elastomer material includes: a polyamide elastomer, an organosilicon-based flame retardant, an inorganic silicon-based flame retardant, and a phosphorus-based synergistic flame retardant. For example, patent CN112210080A discloses a polyamide elastomer material and its preparation method. The polyamide elastomer material is copolymerized from carboxyl-terminated polyamide, polyether, and hydroxyl-modified carbon nanotubes. The preparation of the polyamide elastomer uses a two-step synthesis method, which is easy to control. For example, patent CN115725073A discloses a bio-based polyamide elastomer and its preparation method. This bio-based polyamide elastomer is prepared using pentanediamine and aliphatic diacid prepared by a biological method as monomers. For example, patent CN115477753A discloses a preparation method for a polyamide elastomer and the polyamide elastomer itself. The preparation method of polyamide elastomer includes: (1) in the presence of an ester exchange catalyst, contacting a dicarboxylic acid monoester with a polyol to carry out an ester exchange reaction to obtain an intermediate product containing a carboxyl group at one end and a hydroxyl group at the other end; (2) contacting the intermediate product with a polyamide monomer to carry out a reaction to obtain a polyamide elastomer. For example, patent CN105566639B discloses a preparation method of a polyamide 1012 thermoplastic elastomer, which uses polyamide 1012 as the hard segment and polyether or polyester diol as the soft segment to synthesize a polyamide 1012 elastomer.

[0004] However, existing polyamide elastomers still suffer from insufficient compression set, which fails to meet the application requirements of special scenarios, such as battery pads for new energy vehicles. Summary of the Invention

[0005] To improve the above-mentioned problems, according to one aspect of the present invention, a method for preparing a polyamide elastomer is provided, the method comprising: polymerizing a polyether diol, a polycaprolactone polyol and a carboxyl-terminated polyamide prepolymer in a weight ratio of 85-20:0.1-10:20-85 to obtain a polyamide elastomer.

[0006] The polyamide elastomer obtained by this invention incorporates polycaprolactone polyol into the polyether composition, which serves as the soft segment of the elastomer. This alters the hardness and flexibility of the polyamide elastomer, and improves its processing and mechanical properties. In particular, the introduction of polycaprolactone polyol and the adjustment of its dosage effectively improve the compression set of the resulting polyamide elastomer, while also providing good dynamic and static stiffness. This allows it to meet the performance requirements of applications in specific scenarios, such as the manufacturing process of battery pads for new energy vehicles.

[0007] In some alternative embodiments, the weight ratio of polyether diol, polycaprolactone polyol and carboxyl-terminated polyamide prepolymer can be 85:0.1:20, 75:0.5:30, 65:2:40, 55:4:50, 45:6:60, 35:8:70 or 20:10:85.

[0008] In a preferred embodiment, the polymerization reaction includes a first reaction stage, a second reaction stage, and a third reaction stage carried out sequentially; the reaction temperature of the first reaction stage is 170–200°C, and the reaction time is 0.5–2 h; the reaction temperature of the second reaction stage is 240–280°C, and the reaction time is 0.5–5 h; the reaction temperature of the third reaction stage is 240–280°C, the reaction time is 0.5–1 h, and the reaction pressure is ≤500 Pa.

[0009] Furthermore, the carboxyl-terminated polyamide prepolymer is a carboxyl-terminated AABB type polyamide. In some optional embodiments, the carboxyl-terminated polyamide prepolymer is a carboxyl-terminated polyamide PA612 prepolymer and / or a carboxyl-terminated polyamide PA1012 prepolymer.

[0010] The aforementioned carboxyl-terminated polyamide prepolymer is commercially available or can be prepared using conventional methods in the art. In one optional embodiment, the carboxyl-terminated polyamide prepolymer can be prepared by the following method: a polyamide nylon salt (e.g., PA1012 salt) and deionized water are mixed at a weight ratio of 1:0.2–0.8, and added to a reaction vessel along with a diacid (e.g., an aliphatic diacid with C10–C12 carbon atoms). The air inside the vessel is displaced, and the temperature gradient inside the vessel is raised to 170–200°C and reacted at this temperature for 0.5–3 hours, while maintaining the pressure inside the vessel at 0.5–2.5 MPa. The pressure is then released to atmospheric pressure, and the temperature is further raised to 240–280°C and reacted at this temperature for 0.3–2 hours. Subsequently, a vacuum is drawn, and the reaction is continued at a vacuum level below 300 Pa for 0.3–1 hour to obtain the carboxyl-terminated polyamide prepolymer.

[0011] Furthermore, the hydroxyl value of the polycaprolactone polyol is 30-150 mgKOH / g; preferably, the number average molecular weight of the polycaprolactone polyol is 500-10000, for example, 500, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000.

[0012] The aforementioned polycaprolactone polyol is commercially available or prepared using conventional methods in the art. In a preferred embodiment, the polycaprolactone polyol can be prepared by the following method: caprolactone monomer, branching agent (e.g., triethanolamine, phloroglucinol, pentaerythritol, and other multi-branched hydroxyl compounds), initiator (e.g., trimethylolpropane, glycerol, and other multi-branched alkanes with hydroxyl-terminated groups), and catalyst (e.g., tetrabutyl titanate) are added to a clean, dry, oxygen-free, and anhydrous reactor and reacted at 130–160°C under nitrogen protection with temperature control and stirring for 5–9 hours. Heating is then stopped, and nitrogen is continuously purged and stirred until the temperature of the reactants drops below 60°C. The reacted polycaprolactone polyol is cooled under nitrogen protection, dissolved in chloroform, then reprecipitated with methanol, filtered, and dried under vacuum.

[0013] Furthermore, the number average molecular weight of the polyether diol is 500 to 5000, for example, 500, 1000, 2000, 3000, 4000, or 5000; preferably, the polyether diol is selected from one or more of polyethylene glycol, polypropylene glycol, or polytetrahydrofuran diol.

[0014] Furthermore, the catalyst used in the above polymerization reaction is an organic acid salt, alkoxy salt, or acetylacetonate containing the elements Ti, Ge, La, Ce, Zn, Fe, Mn, Co, V, Zr, Li, and Ca; preferably, the catalyst is selected from one of tetrabutyl titanate, tetraisopropyl titanate, antimony trioxide, antimony acetate, or antimony glycolate. In a preferred embodiment, the catalyst content in the polymerization reaction system is 0.01–4 wt‰, preferably 0.5–2 wt‰.

[0015] According to another aspect of the present invention, a polyamide elastomer prepared by the aforementioned method for preparing polyamide elastomers is provided. The melt index of the polyamide elastomer, measured at a temperature of 230°C and a pressure of 2.16 kg, is 5–15 g / 10 min.

[0016] According to another aspect of the present invention, an application of a polyamide elastomer prepared by the aforementioned method for preparing polyamide elastomers in a battery pad for a new energy vehicle is provided. Detailed Implementation

[0017] In order to provide a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention will now be described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0018] Raw material sources in the examples:

[0019] PA1012 Salt: Shandong Dongchen

[0020] Dodecyl diic acid: Jinan Xiangfeng Weiye

[0021] Polytetrahydrofuran diol (number average molecular weight Mn = 2000): Xinjiang Meike

[0022] Triethanolamine: Merck

[0023] Caprolactone monomer: Merck

[0024] Phloroglucinol: Merck

[0025] Tetrabutyl titanate: Chinese medicine

[0026] Example 1

[0027] Different masses of caprolactone monomer, initiator trimethylolpropane, branching agent triethanolamine or phloroglucinol, and catalyst tetrabutyl titanate were added to a clean, dry, oxygen-free, and anhydrous flask. Under nitrogen protection, the mixture was heated at 150°C for 6 hours, then the heating was stopped and the mixture was cooled to room temperature. The reactants were dissolved in chloroform, then reprecipitated with methanol, filtered, and dried under vacuum to obtain polycaprolactone polyols A, B, C, and D. Their parameters are shown in Table 1.

[0028] Table 1

[0029]

[0030] Example 2

[0031] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was purged three times, the mixture was stirred, and the temperature was raised to 190°C. The pressure was 1 MPa, and the reaction was continued for 30 minutes. Then, the temperature was raised to 260°C, and the reaction was continued for 2 hours. Under vacuum (200 Pa), the reaction was continued for another 0.5 hours to obtain an AABB-type carboxyl-terminated polyamide prepolymer. After restoring atmospheric pressure with nitrogen, polytetrahydrofuran glycol, polycaprolactone polyol A, and tetrabutyl titanate catalyst were added. Nitrogen was purged three times, and the temperature was raised to 190°C. Stirring was started, and the reaction was maintained at this temperature for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 1 hour. Finally, under vacuum (400 Pa), the reaction was continued for 1 hour to obtain a polyamide elastomer.

[0032] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran glycol, polycaprolactone polyol A, and tetrabutyl titanate is 60:5:1:40:0.1:0.5. The weight ratio of polytetrahydrofuran glycol, polycaprolactone polyol A, and carboxyl-terminated polyamide prepolymer is 40:0.1:65.

[0033] Example 3

[0034] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was evacuated three times, and the mixture was stirred. The temperature was raised to 190°C, and the pressure was 1 MPa. After reacting for 30 minutes, the temperature was raised to 260°C, and the reaction was continued for 2 hours under a vacuum of 200 Pa for 0.5 hours to obtain an AABB-type carboxyl-terminated polyamide prepolymer. After restoring atmospheric pressure by purging with nitrogen, polytetrahydrofuran glycol, polycaprolactone polyol B, and tetrabutyl titanate catalyst were added. Nitrogen was evacuated three times, and the temperature was raised to 190°C. Stirring was started, and the reaction was maintained at this temperature for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 1 hour. A vacuum of 400 Pa was then applied, and the reaction was continued for 1 hour to obtain a polyamide elastomer.

[0035] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, polycaprolactone polyol B, and tetrabutyl titanate is 60:5:1:40:0.1:0.5. The weight ratio of polytetrahydrofuran diol, polycaprolactone polyol B, and AABB-type carboxyl-terminated polyamide prepolymer is 40:0.1:65.

[0036] Example 4

[0037] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was evacuated three times, and the mixture was stirred. The temperature was raised to 190°C, and the pressure was 1 MPa. After reacting for 30 minutes, the temperature was raised to 260°C, and the reaction was continued for 2 hours. Under vacuum (200 Pa), the reaction was continued for 0.5 hours to obtain an AABB-type carboxyl-terminated polyamide prepolymer. After restoring atmospheric pressure with nitrogen, polytetrahydrofuran glycol, polycaprolactone polyol C, and tetrabutyl titanate were added. Nitrogen was evacuated three times, and the temperature was raised to 190°C. Stirring was started, and the temperature was maintained for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 1 hour. Under vacuum (400 Pa), the reaction was continued for 1 hour to obtain a polyamide elastomer.

[0038] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, polycaprolactone polyol C, and tetrabutyl titanate is 60:5:1:40:0.1:0.5. The weight ratio of polytetrahydrofuran diol, polycaprolactone polyol C, and AABB-type carboxyl-terminated polyamide prepolymer is 40:0.1:65.

[0039] Example 5

[0040] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen gas was evacuated three times, and the mixture was stirred. The temperature was raised to 190°C, and the pressure was 1 MPa. After reacting for 30 minutes, the temperature was raised to 260°C, and the reaction was continued for 2 hours. Under vacuum (200 Pa), the reaction was continued for 0.5 hours to obtain an AABB-type carboxyl-terminated polyamide prepolymer. After restoring atmospheric pressure by purging with nitrogen, polytetrahydrofuran glycol, polycaprolactone polyol D, and tetrabutyl titanate were added. Nitrogen gas was evacuated three times, and the temperature was raised to 190°C. Stirring was started, and the temperature was maintained for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 1 hour. Under vacuum (400 Pa), the reaction was continued for 1 hour to obtain a polyamide elastomer.

[0041] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, polycaprolactone polyol D, and tetrabutyl titanate is 60:5:1:40:0.1:0.5. The weight ratio of polytetrahydrofuran diol, polycaprolactone polyol D, and AABB-type carboxyl-terminated polyamide prepolymer is 40:0.1:65.

[0042] Example 6

[0043] The only difference from Example 2 is that the weight ratio of polytetrahydrofuran diol, polycaprolactone polyol A and AABB type carboxyl-terminated polyamide prepolymer is 85:0.1:20.

[0044] Example 7

[0045] The only difference from Example 2 is that the weight ratio of polytetrahydrofuran diol, polycaprolactone polyol A and AABB type carboxyl-terminated polyamide prepolymer is 20:10:85.

[0046] Example 8

[0047] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was evacuated three times, and the mixture was stirred. The temperature was raised to 170°C, and the pressure was 1 MPa. After reacting for 30 minutes, the temperature was raised to 240°C, and the reaction was continued for 2 hours. Under vacuum (200 Pa), the reaction was continued for 0.5 hours to obtain an AABB-type carboxyl-terminated polyamide prepolymer. After restoring atmospheric pressure with nitrogen, polytetrahydrofuran glycol, polycaprolactone polyol D, and tetrabutyl titanate were added. Nitrogen was evacuated three times, and the temperature was raised to 170°C. Stirring was started, and the temperature was maintained for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 240°C for 5 hours. Under vacuum (400 Pa), the reaction was continued for 1 hour to obtain a polyamide elastomer.

[0048] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, polycaprolactone polyol D, and tetrabutyl titanate is 60:5:1:40:0.1:0.5. The weight ratio of polytetrahydrofuran diol, polycaprolactone polyol D, and AABB-type carboxyl-terminated polyamide prepolymer is 40:0.1:65.

[0049] Example 9

[0050] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was evacuated three times, and the mixture was stirred. The temperature was raised to 200°C, and the pressure was 1 MPa. After reacting for 30 minutes, the temperature was raised to 280°C, and the reaction was continued for 2 hours. Under vacuum (200 Pa), the reaction was continued for 0.5 hours to obtain an AABB-type carboxyl-terminated polyamide prepolymer. After restoring atmospheric pressure with nitrogen, polytetrahydrofuran glycol, polycaprolactone polyol D, and tetrabutyl titanate were added. Nitrogen was evacuated three times, and the temperature was raised to 200°C. Stirring was started, and the temperature was maintained for 0.5 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 280°C for 1 hour. Under vacuum (400 Pa), the reaction was continued for 1 hour to obtain a polyamide elastomer.

[0051] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, polycaprolactone polyol D, and tetrabutyl titanate is 60:5:1:40:0.1:0.5. The weight ratio of polytetrahydrofuran diol, polycaprolactone polyol D, and AABB-type carboxyl-terminated polyamide prepolymer is 40:0.1:65.

[0052] Example 10

[0053] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was evacuated three times, and the mixture was stirred. The temperature was raised to 190°C, and the pressure was 1 MPa. After reacting for 30 minutes, the temperature was raised to 260°C, and the reaction was continued for 2 hours. Under vacuum (200 Pa), the reaction was continued for 0.5 hours to obtain an AABB-type carboxyl-terminated polyamide prepolymer. After restoring atmospheric pressure with nitrogen, polytetrahydrofuran glycol, polycaprolactone polyol D, and tetrabutyl titanate were added. Nitrogen was evacuated three times, and the temperature was raised to 190°C. Stirring was started, and the temperature was maintained for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 0.5 hours. Under vacuum (100 Pa), the reaction was continued for 0.5 hours to obtain a polyamide elastomer.

[0054] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, polycaprolactone polyol D, and tetrabutyl titanate is 60:5:1:40:0.1:0.5. The weight ratio of polytetrahydrofuran diol, polycaprolactone polyol D, and AABB-type carboxyl-terminated polyamide prepolymer is 40:0.1:65.

[0055] Comparative Example 1

[0056] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was purged three times, the mixture was stirred, and the temperature was raised to 190°C. The pressure was 1 MPa, and the reaction was carried out for 30 minutes. Then, the temperature was raised to 260°C, and the reaction was carried out for 2 hours. The reaction was continued for 0.5 hours under a vacuum of 200 Pa. After restoring atmospheric pressure by purging with nitrogen, polytetrahydrofuran glycol and tetrabutyl titanate were added. Nitrogen was purged three times, and the temperature was raised to 190°C. Stirring was started, and the temperature was maintained for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 1 hour. A vacuum of 400 Pa was applied, and the reaction was carried out for 1 hour to obtain the polyamide elastomer.

[0057] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, and tetrabutyl titanate is 60:5:1:40:0.5.

[0058] Comparative Example 2

[0059] PA1012 salt, dodecyl dicarboxylic acid, and water were added to a reactor. Nitrogen was purged three times, the mixture was stirred, and the temperature was raised to 190°C. The pressure was 1 MPa, and the reaction was carried out for 30 minutes. Then, the temperature was raised to 260°C, and the reaction was carried out for 2 hours. The reaction was continued for 0.5 hours under a vacuum of 200 Pa. After restoring atmospheric pressure by purging with nitrogen, polytetrahydrofuran glycol, triethanolamine, and tetrabutyl titanate were added. Nitrogen was purged three times, and the temperature was raised to 190°C. Stirring was started, and the temperature was maintained for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 1 hour. A vacuum of 400 Pa was applied, and the reaction was carried out for 1 hour to obtain the polyamide elastomer.

[0060] The weight ratio of PA1012 salt, dodecyl dicarboxylic acid, water, polytetrahydrofuran diol, triethanolamine, and tetrabutyl titanate is 60:5:1:40:0.1:0.5.

[0061] Comparative Example 3

[0062] PA1012 salt, dodecyl diacid, and water were added to a reactor. Nitrogen gas was evacuated three times, and the mixture was stirred. The temperature was raised to 190°C, and the pressure was 1 MPa. After reacting for 30 minutes, the temperature was raised to 260°C, and the reaction was continued for 2 hours under a vacuum of 200 Pa for 0.5 hours. After restoring atmospheric pressure by purging with nitrogen, polytetrahydrofuran glycol, phloroglucinol, and tetrabutyl titanate were added. Nitrogen gas was evacuated three times, and the temperature was raised to 190°C. Stirring was started, and the temperature was maintained for 2 hours. The pressure was then released to atmospheric pressure, and the reaction temperature was raised to 260°C for 1 hour. A vacuum of 400 Pa was applied, and the reaction was continued for 1 hour to obtain a polyamide elastomer. The weight ratio of PA1012 salt, dodecyl diacid, water, polytetrahydrofuran glycol, phloroglucinol, and tetrabutyl titanate was 60:5:1:40:0.1:0.5.

[0063] Performance characterization:

[0064] Hardness: GB / T 2411-2008.

[0065] Tensile strength: GB / T 1040.1-2018.

[0066] Elongation at break: GB / T 1040.1-2018.

[0067] Intrinsic viscosity: GB-T 10247-2008.

[0068] Gel content: Dissolve the sample in a mixed solution of o-cresol and chloroform (o-cresol / chloroform mass ratio of 3:7), filter out the insoluble matter, dry, and weigh.

[0069] Compression set: ASTM D395-2003.

[0070] The test results are shown in Table 2.

[0071] Table 2

[0072]

[0073]

[0074] A comparison of Examples 2-10 and Comparative Examples 1-3 reveals that the polyamide elastomer obtained by this invention, by introducing polycaprolactone polyol into the polyether composition (which serves as the soft segment of the elastomer), can alter the hardness and flexibility of the polyamide elastomer, and improve its processing and mechanical properties. In particular, the introduction of polycaprolactone polyol and the adjustment of its dosage in this invention can increase the compression set of the resulting polyamide elastomer by approximately 20%, while also exhibiting good dynamic and static stiffness. This allows it to meet the performance requirements of applications in specific scenarios, such as the manufacturing process of battery pads for new energy vehicles.

Claims

1. A process for the preparation of a polyamide elastomer, characterized in that, The application relates to a polyamide elastomer and a preparation method thereof. The polyether diol, the polycaprolactone polyol and a carboxyl-terminated polyamide prepolymer are subjected to a polymerization reaction in a weight ratio of 0.1-10:20-85 to obtain the polyamide elastomer. The polymerization reaction comprises sequentially performing a first reaction stage, a second reaction stage and a third reaction stage; 2. The method of preparing a polyamide elastomer according to claim 1, characterized in that, The first reaction stage has a reaction temperature of 170-200 DEG C and a reaction time of 0.5-2h; The second reaction stage has a reaction temperature of 240-280 DEG C and a reaction time of 0.5-5h; The third reaction stage has a reaction temperature of 240-280 DEG C, a reaction time of 0.5-1h and a reaction pressure of less than or equal to 500pa. The polycaprolactone polyol has a hydroxyl value of 30-150mgKOH / g.

3. The process for the preparation of a polyamide elastomer according to claim 1 or 2, characterized in that, Preferably, the polycaprolactone polyol has a number average molecular weight of 500-10000. The carboxyl-terminated polyamide prepolymer is a carboxyl-terminated AABB type polyamide.

4. The method of producing a polyamide elastomer according to claim 1, characterized by, The polyether diol has a number average molecular weight of 500-5000.

5. The method of making a polyamide elastomer according to claim 1, wherein, Preferably, the polyether diol is selected from one or more of polyethylene glycol, polypropylene glycol or polytetrahydrofuran diol. The catalyst used in the polymerization reaction is an organic acid salt, an alkoxy salt or an acetylacetone salt containing elements Ti, Ge, La, Ce, Zn, Fe, Mn, Co, V, Zr, Li, Ca; 6. The method of making a polyamide elastomer according to claim 1, wherein, Preferably, the catalyst is selected from one or more of tetrabutyl titanate, tetraisopropyl titanate, antimony trioxide, antimony acetate and antimony glycolate. In the polymerization reaction system, the content of the catalyst is 0.01-4wt‰, preferably 0.5-2wt‰.

7. The method of producing a polyamide elastomer according to claim 6, characterized by, The polyamide elastomer is prepared by the preparation method of any one of claims 1-7.

8. A polyamide elastomer characterized by, The polyamide elastomer has a melt index of 5-15g / 10min when measured at a temperature of 230 DEG C and a pressure of 2.16kg.

9. The polyamide elastomer according to claim 8, wherein, 10. The polyamide elastomer according to claim 8 or 9 is applied to the manufacture of new energy automobile battery gaskets. ​

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