A method for preparing a nylon elastomer having good dyeability, antibacterial property and antistatic property

Abstract

The application provides a preparation method of nylon elastomer with good dyeing property, antibacterial property and antistatic property, comprising the following steps: S1, preparing double-carboxyl-terminated nylon hard segments by using diacid, diamine or lactam and end-capping agent; S2, preparing double-carboxyl-terminated nylon elastomer with a certain molecular weight by reacting the double-carboxyl-terminated nylon hard segments and polyether polyol; S3, preparing nylon elastomer with double-amino-terminated and guanidino group by reacting the double-carboxyl-terminated nylon elastomer and double-amino-terminated aminoguanidino compound; and S4, impregnating the nylon elastomer with double-amino-terminated and guanidino group in an anionic antistatic agent solution. The novel nylon elastomer prepared by the application has a high molecular weight, the double-amino-termination helps to improve the dyeing property, the copolymerization of guanidino group endows the nylon elastomer with good antibacterial property, and the guanidino group and the anionic antistatic agent are combined through ionic bond to endow the nylon elastomer with more firm antistatic property.

Description

Technical Field

[0001] This invention relates to the technical field of elastomer preparation, and specifically to a method for preparing a nylon elastomer with good dyeability, antibacterial properties and antistatic properties. Background Technology

[0002] Thermoplastic polyamide elastomers, commonly known as nylon elastomers (TPAEs), are block copolymers composed of highly crystalline nylon, amorphous polyethers, or polyesters. They possess characteristics such as high tensile strength, good elastic recovery, high impact strength, excellent low-temperature resistance, and ease of processing. They can be used as gas separation membranes, structural foams, and antistatic agents, and are applied in sports footwear materials, consumer electronics, automobiles, medical devices, and eyewear. However, in the spinning and dyeing process of shoe uppers, nylon elastomers contain amide bonds, resulting in high molecular chain regularity and numerous intermolecular hydrogen bonds. Currently, most polyamide elastomers on the market are hydroxyl and carboxyl end-capped, lacking dyeable functional groups, thus leading to poor dyeing performance after spinning. Secondly, during the spinning process of shoe uppers, the presence of static electricity affects the uniformity and stability of the spinning process, causing problems with production efficiency and product quality. Finally, nylon elastomer products are prone to bacterial contamination and growth, posing health risks to users, making antibacterial biomaterials a research hotspot. Currently, most common antibacterial nylon elastomers use melt blending to add antibacterial agents. However, this method suffers from poor dispersibility and compatibility with the bulk material, as well as precipitation and failure under long-term use, resulting in poor antibacterial effects. Furthermore, nylon elastomers with added antibacterial agents via blending are prone to filament breakage during shoe upper spinning due to poor compatibility.

[0003] Currently, only a few patents address the dyeing properties of nylon. Patents EP0379470 and USP5932640 disclose methods for obtaining nylon resins with high terminal amine content, proposing that introducing one or more compounds with special structural groups onto the nylon matrix can improve the dyeing properties of nylon fibers, but they do not address the antibacterial properties of nylon. Chinese patent CN201911373886.3 prepares antibacterial nylon by silver plating on the surface of nylon fibers. Chinese patent CN201910235403.7 forms antibacterial nylon by melting a blend of micro / nano-sized silver chloride and barium sulfate precipitates with raw material nylon 6. The aforementioned antibacterial agents are mostly introduced into polymer systems through coating, physical adsorption, or blending. These antibacterial agents suffer from uneven dispersion and compatibility issues, resulting in poor antibacterial effects. Chinese Patent 200710137687.3 discloses a method for manufacturing a multilayer polypropylene nonwoven fabric for medical use, which uses anionic sulfonate as an antistatic agent. However, the synthetic fibers do not interact with this type of antistatic agent, resulting in poor bonding performance and weak antistatic effect. Summary of the Invention

[0004] To overcome the problems of the prior art, the present invention provides a method for preparing a nylon elastomer with good dyeability, antibacterial properties and antistatic properties.

[0005] To achieve the objectives of this invention, the following technical solution is adopted:

[0006] A method for preparing a nylon elastomer with good stainability and antibacterial properties includes the following steps:

[0007] S1, diacid, diamine or lactam, and end-capping agent are reacted to prepare dicarboxylated end-capped nylon hard segments;

[0008] S2. The dicarboxyl-terminated nylon hard segments and polyether polyols are reacted under the action of catalyst 1 to generate a dicarboxyl-terminated nylon elastomer with a certain molecular weight.

[0009] S3. A nylon elastomer with a dicarboxyl group-terminated and an aminoguanidine compound with a diamino group-terminated are reacted under the action of catalyst 2 to generate a nylon elastomer with a diamino group-terminated and guanidine group.

[0010] S4. Impregnate the nylon elastomer with diamino-terminated guanidine groups using an anionic antistatic agent solution to obtain the nylon elastomer with good stainability, antibacterial properties and antistatic properties as described in this invention.

[0011] In an embodiment of the method of the present invention, the dicarboxylic acid in step S1 includes C5-C64. 18 One or more of the dicarboxylic acids, preferably any one or more of adipic acid, sebacic acid, and dodecanoic acid;

[0012] The diamine includes C5-C 13 One or more of the diamines, preferably any one or a combination of two of hexamethylenediamine and decanediamine;

[0013] In an embodiment of the method of the present invention, the lactam mentioned in step S1 includes caprolactam and dodecyl lactam;

[0014] The capping agent includes C5-C. 18 One or more of the dicarboxylic acids, preferably one or more of adipic acid, sebacic acid, and dodecanoic acid;

[0015] The reaction conditions for preparing the dicarboxylated end-capped nylon hard segment described in S1 are as follows: after adding the dicarboxylic acid, diamine or lactam, and end-capping agent to the polymerization reactor, the air inside the reactor is removed, the temperature is raised to 220-270℃, the pressure inside the reactor is 2-4MPa, the reaction is carried out for 4-8 hours, the pressure is released to atmospheric pressure, and the vacuum is drawn to absolute pressure of 5-10kpa.

[0016] The number-average molecular weight of the prepared dicarboxylated end-capped nylon hard segment is preferably 1000-10000 g / mol.

[0017] In an embodiment of the method of the present invention, in step S2, to ensure that a nylon elastomer with dicarboxyl groups is obtained, the molar ratio of the nylon hard segment with dicarboxyl groups to the polyether polyol is preferably (1.1-1.5):1.

[0018] The polyether polyol is selected from one or more of polyethylene glycol, polypropylene glycol or polybutanediol, preferably a polyether polyol with a molecular weight of 500-2000 g / mol;

[0019] The catalyst 1 is selected from those with the general formula M(OR). n Metal alkoxides, where M is Sb, Ti, Zr, or Ge, and R is C. 1～10 The alkyl group, where n takes the value of 1 to 4, preferably 4;

[0020] The amount of catalyst 1 added is 0.01 wt% to 0.5 wt% of the total mass of the dicarboxyl-terminated nylon hard segment and the polyether polyol;

[0021] The reaction is carried out at a temperature of 200-260℃ and a vacuum degree of less than 500 PaA for 2-6 hours to obtain a dicarboxylated end-capped nylon elastomer with a preferred molecular weight of 15000-46000 g / mol.

[0022] In an embodiment of the method of the present invention, in step S3, a nylon elastomer with a dicarboxyl group and an aminoguanidine compound with a diamino group are reacted at 200-270°C for 2-5 hours under the action of catalyst 2, and then the reaction is carried out under vacuum for 1-3 hours to generate a nylon elastomer with a diamino group and containing a guanidine group.

[0023] The molar ratio of the dicarboxyl-terminated nylon elastomer to the diamino-terminated aminoguanidine compound is approximately 1:2 to ensure that the nylon elastomer is diamino-terminated.

[0024] The diamino-terminated aminoguanidine compounds include, but are not limited to, polyhexamethylene guanidine, guanidine butamine, and aminoguanidine, with polyhexamethylene guanidine having a linear molecular chain structure being preferred; the polyhexamethylene guanidine structure has three linear types, as shown below:

[0025]

[0026] The two types of catalysts added are: phosphoric acid, phosphorous acid, hypophosphorous acid and their salt derivatives, with sodium hypophosphite being preferred;

[0027] The amount of catalyst 2 added is 0.01 wt% to 0.5 wt% of the total mass of the dicarboxyl-terminated nylon elastomer and the diamino-terminated aminoguanidine compound.

[0028] In step S4 of the embodiment of the method of the present invention, a nylon elastomer with guanidine groups and end-capped with diamino groups is impregnated with an anionic antistatic agent solvent.

[0029] The anionic antistatic agent is selected from phosphate esters, alkyl sulfonates, and alkyl phosphates, with alkyl sulfonates being preferred.

[0030] The above technical solution achieves the following technical effects:

[0031] This invention obtains a nylon elastomer containing guanidine groups by copolymerizing a diamino-terminated aminoguanidine compound with a nylon elastomer, and then impregnating it with an anionic antistatic agent. The resulting nylon elastomer has good dyeing properties, stable antibacterial effect, and strong antistatic properties. Detailed Implementation

[0032] To better understand the technical solution of the present invention, the content of the present invention will be further described below with reference to the embodiments, but the content of the present invention is not limited to the following embodiments;

[0033] The following test methods are used in various embodiments of the present invention:

[0034] (1) Antibacterial method: According to GB / T 31402—2015, the selected strain is Staphylococcus aureus (10 5 CFU / mL), culture temperature: 37℃, culture time: 24h;

[0035] (2) Surface resistivity: The test was conducted in accordance with the test method of GB / T 24249-2009.

[0036] (3) Dyeing percentage: The absorbance of the dye solution before and after staining at the maximum absorption wavelength was measured using a UV-Vis spectrophotometer. The dyeing percentage was calculated according to the following formula:

[0037]

[0038] Where A0 is the absorbance of the dye solution before staining, n0 is the dilution factor of the dye solution before staining, A1 is the absorbance of the dye solution after staining, and n1 is the dilution factor of the dye solution after staining.

[0039] In the following examples and comparative examples, nylon elastomer granules are fed into the inlet of a screw extruder or a mesh spinning head, where they are melted, homogenized, and pressurized. The molten nylon elastomer is then spun into fibers and finely woven to obtain nylon elastomer fabric. The nylon elastomer fabric is dyed using Eriofast reactive dye (pH 5.0). The dyeing process involves: heating to 95°C at 1.0°C / min and holding for 40 minutes, followed by cooling to below 50°C at 2.0°C / min. After dyeing, the fabric is soaped at 60°C for 10 minutes using 2 g / L soaping agent and 2 g / L sodium carbonate.

[0040] The dyeing percentages of different nylon elastomer resins were compared, and the results are shown in Table 1.

[0041] The raw materials used in the following examples and comparative examples are all commercially available chemicals of industrial grade purity.

[0042] raw material factory other Sebacdiamine Shandong Chiyue Chemical Co., Ltd. Industrial grade sebacic acid Shanghai Kaisai Biotechnology Co., Ltd. Industrial grade adipic acid Huafeng Group Co., Ltd. Industrial grade Dodecanedioic acid Shandong Guangtong New Materials Co., Ltd. Industrial grade dodecyl lactam Wanhua Chemical Group Co., Ltd. Industrial grade caprolactam China Pingmei Shenma Group Industrial grade Polybutanediol BASF AG Industrial grade polyethylene glycol BASF AG Industrial grade Polypropylene glycol BASF AG Industrial grade Polyhexamethylene guanidine Shanghai Gaoju Biotechnology Co., Ltd. Industrial grade Guanidinobutylamine Shanghai Kehua Biotechnology Co., Ltd. Industrial grade

[0043] Example 1

[0044] (1) 6.623 kg of decanediamine, 8.377 kg of sebacic acid and 7.5 kg of water were placed in a polymerization reactor and reacted for 7 h at a temperature of 220 °C and a pressure of 2.0 MPa. The pressure was slowly released to atmospheric pressure and then evacuated to an absolute pressure of 5 kPa to obtain nylon 1010 hard segments with dicarboxyl end caps and a number average molecular weight of 5000 g / mol.

[0045] (2) 7.89 kg of dicarboxylated nylon 1010 hard segments prepared in step (1), 2.11 kg of polypropylene glycol (number average molecular weight 2000 g / mol), and 27 g of tetraethoxygermanium were put into a polymerization reactor, stirred and heated to 200 °C, and reacted for 6 h under vacuum of 50 PaA to prepare a dicarboxylated nylon elastomer with a number average molecular weight of 19000 g / mol.

[0046] (3) 9.57 kg of dicarboxyl-terminated nylon elastomer, 0.43 kg of polyhexamethylene guanidine ((a) structure, number average molecular weight 423 g / mol, the same below), and 15 g of phosphorous acid prepared in step (2) were added into the reactor. After nitrogen purging, stirring was started and the temperature was raised to 240℃ for 5 h. After depressurization, vacuum pump was used to evacuate the reactor for 1 h. Positive pressure was restored in the reactor. The strips were impregnated in alkyl sulfonate solution and then pelletized using a pelletizer to obtain nylon elastomer resin 1 with good dyeability and antibacterial properties.

[0047] Example 2

[0048] (1) 8.54 kg caprolactam, 1.46 kg adipic acid and 1 kg water were put into the polymerization reactor and reacted at 260 °C and 3.5 MPa for 6 h. The pressure was slowly released to atmospheric pressure and vacuumed to absolute pressure of 8 kPa to obtain nylon 66 hard segments with dicarboxyl end caps and a number average molecular weight of 1000 g / mol.

[0049] (2) 5.33 kg of dicarboxylated nylon 66 hard segments, 4.67 kg of polybutanediol (number average molecular weight 1000 g / mol), and 10 g of zirconium n-propoxide prepared in step (1) were added into the polymerization reactor and nitrogen was purged. Stirring was started and the temperature was raised to 240°C. The reaction was carried out under vacuum of 200 PaA for 4 h to prepare a dicarboxylated nylon elastomer with a number average molecular weight of 15000 g / mol.

[0050] (3) 9.83 kg of dicarboxyl-terminated nylon elastomer prepared in step (2), 0.17 kg of guanidine amine (number average molecular weight 130 g / mol), and 20 g of sodium hypophosphite were added into the reactor. After purging with nitrogen, stirring was started and the temperature was raised to 230 °C for 2.5 h. After depressurization, vacuum pump was used to evacuate the reactor for 1.5 h. Positive pressure was restored in the reactor. The strips were impregnated in alkyl sulfonate solution and then pelletized using a pelletizer to obtain nylon elastomer resin 2 with good dyeability and antibacterial properties.

[0051] Example 3

[0052] (1) 9.798 kg dodecyl lactam, 0.202 kg sebacic acid and 1 kg water were put into the polymerization reactor and reacted at 270℃ and 3.8 MPa for 8 hours. The pressure was slowly released to atmospheric pressure and then evacuated to absolute pressure of 10 kPa to obtain nylon 12 hard segments with dicarboxyl end caps and a number average molecular weight of 10000 g / mol.

[0053] (2) 8.696 kg of dicarboxylated end-capped nylon 12 hard segments prepared in step (1), 1.304 kg of polyethylene glycol (number average molecular weight 2000 g / mol), and 50 g of antimony ethoxylate were added into the polymerization reactor for nitrogen purging. After purging, the reactor temperature was raised to 260℃ and the reaction was carried out under vacuum of 500 PaA for 6 h to prepare a dicarboxylated end-capped nylon elastomer with a number average molecular weight of 46000 g / mol.

[0054] (3) 9.819 kg of dicarboxyl-terminated nylon elastomer, 0.181 kg of polyhexamethylene guanidine, and 15 g of phosphoric acid prepared in step (2) were added into the reactor. After nitrogen purging, stirring was started and the temperature was raised to 270°C for 5 h. After depressurization, vacuum pump was used to evacuate the reactor for 3 h. Positive pressure was restored in the reactor. The strips were impregnated in alkyl sulfonate solution and then pelletized using a pelletizer to obtain nylon elastomer resin 3 with good dyeability and antibacterial properties.

[0055] Example 4

[0056] (1) 3.33 kg of decanediamine, 6.67 kg of dodecanoic acid and 5 kg of water were put into the polymerization reactor and reacted at 260°C and 3.2 MPa for 4 h. The pressure was slowly released to atmospheric pressure and vacuumed to absolute pressure of 5 kPa to obtain nylon 1012 hard segments with dicarboxyl end caps and a number average molecular weight of 1000 g / mol.

[0057] (2) 6.875 kg of dicarboxylated nylon 1012 hard segments prepared in step (1), 3.125 kg of polybutanediol (number average molecular weight 500 g / mol), and 40 g of tetrabutyl titanate were put into a polymerization reactor. After nitrogen purging, stirring was started and the temperature was raised to 220°C. The vacuum degree was controlled at 100 PaA and the reaction was carried out for 6 h to prepare a dicarboxylated nylon elastomer with a molecular weight of 16000 g / mol.

[0058] (3) 9.84 kg of dicarboxyl-terminated nylon elastomer, 0.16 kg of guanidine amine (number average molecular weight 130 g / mol), and 10 g of phosphorous acid prepared in step (2) were added into the reactor. After nitrogen purging, stirring was started and the temperature was raised to 200℃ for 5 h. After depressurization, vacuum pump was used to evacuate the reactor for 2 h. Positive pressure was restored in the reactor. The strips were impregnated in alkyl sulfonate solution and then pelletized using a pelletizer to obtain nylon elastomer resin 4 with good dyeability and antibacterial properties.

[0059] Example 5

[0060] (1) 9.635 kg dodecyl lactam, 0.365 kg adipic acid and 1 kg water were put into a polymerization reactor and reacted at 260℃ and 3.2 MPa for 4 h. The pressure was slowly released to atmospheric pressure and vacuumed to absolute pressure of 7 kPa to obtain nylon 12 hard segments with dicarboxyl end caps and a number average molecular weight of 4000 g / mol.

[0061] (2) 8.276 kg of dicarboxylated nylon 12 hard segments prepared in step (1), 1.724 kg of polybutanediol (number average molecular weight 1000 g / mol), and 30 g of zirconium n-butoxide were put into a polymerization reactor. After nitrogen purging, stirring was started and the temperature was raised to 230°C. The vacuum degree was controlled at 100 PaA and the reaction was carried out for 5 h to prepare a dicarboxylated nylon elastomer with a molecular weight of 29000 g / mol.

[0062] (3) 9.716 kg of dicarboxyl-terminated nylon elastomer, 0.284 kg of polyhexamethylene guanidine, and 15 g of phosphorous acid prepared in step (2) were added into the reactor. After nitrogen purging, stirring was started and the temperature was raised to 240°C for 5 h. After depressurization, vacuum pump was used to evacuate the reactor for 2 h. After the pressure in the reactor was restored, the strips were impregnated in anionic antistatic solution and then pelletized using a pelletizer to obtain nylon elastomer resin 5 with good dyeability and antibacterial properties.

[0063] Comparative Example 1

[0064] (1) 6.623 kg of decanediamine, 8.377 kg of sebacic acid and 7.5 kg of water were put into a polymerization reactor and reacted for 7 h at a temperature of 220 °C and a pressure of 2.0 MPa. The pressure was slowly released to atmospheric pressure and then evacuated to an absolute pressure of 5 kPa to obtain nylon 1010 hard segments with dicarboxyl end caps and a number average molecular weight of 5000 g / mol.

[0065] (2) 7.89 kg of dicarboxylated end-capped nylon 1010 hard segments prepared in step (1), 2.11 kg of polypropylene glycol (number average molecular weight 2000 g / mol), and 27 g of tetraethoxygermanium were put into a polymerization reactor. Stirring was started and the temperature was raised to 200℃. The reaction was carried out under vacuum of 50 PaA for 6 h to prepare dicarboxylated end-capped ordinary nylon elastomer resin 1 with a number average molecular weight of 19000 g / mol.

[0066] Comparative Example 2

[0067] (1) 9.635 kg dodecyl lactam, 0.365 kg adipic acid and 1 kg water were put into a polymerization reactor and reacted at 260℃ and 3.2 MPa for 4 h. The pressure was slowly released to atmospheric pressure and vacuumed to absolute pressure of 7 kPa to obtain nylon 12 hard segments with dicarboxyl end caps and a number average molecular weight of 4000 g / mol.

[0068] (2) 8.276 kg of dicarboxylated nylon 12 hard segments prepared in step (1), 1.724 kg of polybutanediol (number average molecular weight 1000 g / mol), and 30 g of zirconium n-butoxide were put into a polymerization reactor. After nitrogen purging, stirring was started and the temperature was raised to 230°C. The vacuum degree was controlled at 100 PaA and the reaction was carried out for 5 h to prepare a dicarboxylated nylon elastomer with a molecular weight of 29000 g / mol.

[0069] (3) 0.2 kg of polyhexamethylene guanidine salt, 0.5 kg of alkane sulfonate and 8 kg of dicarboxylate-terminated nylon elastomer prepared in step (2) were blended by a twin-screw extruder and then granulated to obtain ordinary nylon elastomer resin 2.

[0070] The nylon elastomer resin prepared above was subjected to performance tests, and the results are shown in Table 1 below;

[0071] Table 1. Coloring rate, sterilization rate, and surface resistivity of Examples 1-5 and Comparative Examples 1-2

[0072]

[0073] It is readily understood that the above embodiments are merely illustrative examples for clear explanation and do not imply that the invention is limited thereto. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing a nylon elastomer, characterized in that, It includes the following steps: S1, diacid, diamine or lactam, and end-capping agent are reacted to prepare dicarboxylated end-capped nylon hard segments; S2. The dicarboxyl-terminated nylon hard segments and polyether polyol are reacted under the action of catalyst 1 to generate a dicarboxyl-terminated nylon elastomer with a certain molecular weight; wherein the molar ratio of the dicarboxyl-terminated nylon hard segments to the polyether polyol is (1.1-1.5):

1. S3. A dicarboxyl-terminated nylon elastomer and a diamino-terminated aminoguanidine compound are reacted under the action of catalyst 2 to generate a diamino-terminated nylon elastomer with guanidine groups; wherein the molar ratio of the dicarboxyl-terminated nylon elastomer to the diamino-terminated aminoguanidine compound is 1:2, and the diamino-terminated aminoguanidine compound includes at least one of polyhexamethylene guanidine, guanidinebutyramine, and aminoguanidine, and the structure of the polyhexamethylene guanidine is shown below: （a） （b） （c）； S4. Impregnate a nylon elastomer with diamino-terminated guanidine groups using an anionic antistatic agent solution to obtain the nylon elastomer.

2. The preparation method according to claim 1, characterized in that, In step S1, the dicarboxylic acid comprises C5-C64. 18 One or more of the dicarboxylic acids; and / or The capping agent includes C5-C. 18 One or more of the dicarboxylic acids.

3. The preparation method according to claim 2, characterized in that, In step S1, the dicarboxylic acid includes any one or a combination of two or more of adipic acid, sebacic acid, and dodecanoic acid; and / or The capping agent includes one or more of adipic acid, sebacic acid, and dodecanoic acid.

4. The preparation method according to claim 1, characterized in that, In step S1, the diamine comprises C5-C 13 One or more of the diamines; and / or The lactam includes at least one of caprolactam and dodecanolactam.

5. The preparation method according to claim 4, characterized in that, In step S1, the diamine includes any one or a combination of two of hexamethylenediamine and decanediamine.

6. The preparation method according to any one of claims 1-5, characterized in that, The reaction conditions for step S1 are as follows: after adding the dicarboxylic acid, diamine or lactam, and end-capping agent to the polymerization reactor, remove the air from the reactor, raise the temperature to 220-270℃, maintain the pressure inside the reactor at 2-4MPa, and react for 4-8 hours. Then, release the pressure to atmospheric pressure and evacuate to an absolute pressure of 5-10kPa.

7. The preparation method according to claim 6, characterized in that, The number-average molecular weight of the dicarboxylated nylon hard segments is 1000-10000 g / mol.

8. The preparation method according to claim 1, characterized in that, In step S2, the polyether polyol is selected from one or more of polyethylene glycol, polypropylene glycol, or polybutanediol.

9. The preparation method according to claim 8, characterized in that, In step S2, the polyether polyol is selected from polyether polyols with a molecular weight of 500-2000 g / mol.

10. The preparation method according to claim 1 or 8, characterized in that, In step S2, the added catalyst 1 accounts for 0.01wt%~0.5wt% of the total amount of the dicarboxyl-terminated nylon hard segment and polyether polyol; The catalyst 1 is selected from those with the general formula M(OR). n Metal alkoxides; wherein M is Sb, Ti, Zr or Ge, and R is C. 1~10 Alkyl groups, where n ranges from 1 to 4.

11. The preparation method according to claim 10, characterized in that, In step S2, the reaction is carried out at a temperature of 200-260℃ and a vacuum degree of less than 500 PaA for 2-6 hours to obtain a dicarboxylated end-capped nylon elastomer with a molecular weight of 15000-46000 g / mol.

12. The preparation method according to claim 1, characterized in that, In step S3, the reaction is carried out at 200-270℃ for 2-5 hours, followed by vacuum decompression reaction for 1-3 hours.

13. The preparation method according to claim 1 or 12, characterized in that, In step S3, catalyst 2 is selected from phosphoric acid, phosphorous acid, hypophosphorous acid and their salts.

14. The preparation method according to claim 13, characterized in that, In step S3, catalyst 2 is sodium hypophosphite.

15. The preparation method according to claim 13, characterized in that, In step S3, the amount of catalyst 2 added is 0.01wt% to 0.5wt% of the total mass of the dicarboxyl-terminated nylon elastomer and the diamino-terminated aminoguanidine compound.

16. The preparation method according to claim 1, characterized in that, In step S4, the anionic antistatic agent is selected from phosphate esters, alkyl sulfonates, and alkyl phosphates.

17. The preparation method according to claim 16, characterized in that, In step S4, the anionic antistatic agent is an alkyl sulfonate.

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