Preparation method of nylon elastomer with good dyeing property, antibacterial property and antistatic property

Abstract

The invention provides a preparation method of a nylon elastomer with good dyeing property, antibacterial property and antistatic property. The preparation method comprises the following steps: S1, preparing a dicarboxyl-terminated nylon hard segment from binary acid, diamine or lactam and an end-capping reagent; s2, reacting the dicarboxyl-terminated nylon hard segment with polyether polyol to generate a dicarboxyl-terminated nylon elastomer with a certain molecular weight; s3, reacting the double-carboxyl-terminated nylon elastomer with the double-amino-terminated aminoguanidine compound to generate a double-amino-terminated nylon elastomer with a guanidyl group; and S4, dipping the double-amino-terminated nylon elastomer with the guanidyl group by using an anionic antistatic agent solution. The novel nylon elastomer prepared by the invention has higher molecular weight, the dyeing property of the novel nylon elastomer is favorably improved by diamino-terminated end, guanidyl is introduced in a copolymerization manner, so that the novel nylon elastomer has good antibacterial property, and meanwhile, the guanidyl is combined with the anionic antistatic agent through an ionic bond, so that the nylon elastomer has firmer antistatic property.

Description

Technical Field

[0001] The invention relates to the technical field of preparing elastomers, and in particular to a method for preparing a nylon elastomer with good dyeability, antibacterial properties and antistatic properties. Background Art

[0002] Thermoplastic polyamide elastomers, commonly known as nylon elastomers (TPAE), are a type of block copolymer composed of highly crystalline nylon, non-crystalline polyether or polyester. They have the characteristics of high tensile strength, good elastic recovery, high impact strength, excellent low temperature resistance, and easy processing. They can be used as gas separation membranes, structural foams, antistatic agents, etc., and are used in sports shoes, consumer electronics, automobiles, medical devices, glasses and other fields. However, in the process of upper spinning and dyeing, since nylon elastomers contain amide bonds, the molecular chain has high regularity, and there are a large number of hydrogen bonds between molecules, most of the polyamide elastomers on the market are hydroxyl and carboxyl end-capped and lack dyeable functional groups. Therefore, the dyeing performance of nylon elastomers after spinning is poor; secondly, in the process of upper spinning, the presence of static electricity will affect the uniformity and stability of spinning, causing problems with production efficiency and product quality; finally, nylon elastomer products are easily contaminated and breed bacteria, which brings health risks to users, and antibacterial biomaterials have become a research hotspot. At present, most common antibacterial nylon elastomers use melt blending to add antibacterial agents, but the antibacterial agents added in this way have problems such as poor dispersibility and compatibility with the main material, precipitation failure under long-term use conditions, etc., and the antibacterial effect is poor. At the same time, nylon elastomers that add antibacterial agents in a blending manner are very prone to broken yarns during shoe upper spinning due to poor compatibility.

[0003] At present, there are only some patents for the dyeing properties of nylon. Patents EP0379470 and USP5932640 disclose methods for obtaining nylon resins with high terminal amine content, and propose that the introduction of one or more compounds with special structural groups into the nylon matrix can improve the dyeing properties of nylon fibers, but do not involve the antibacterial properties of nylon. Chinese patent CN201911373886.3 uses a method of silver plating on the surface of nylon fibers to prepare antibacterial nylon. Chinese patent CN201910235403.7 forms antibacterial nylon by melt-molding a blend of micro-nano-sized silver chloride and barium sulfate precipitates with raw material nylon 6. The above-mentioned antibacterial agents are mostly coated or physically adsorbed or blended into the polymer system. The antibacterial agents have uneven dispersion and compatibility problems, and the antibacterial effect is poor. Chinese patent 200710137687.3 discloses a method for manufacturing a medical polypropylene multilayer nonwoven fabric, using anionic sulfonate as an antistatic agent. Synthetic fibers and the antistatic agent have no interaction, and the combination performance of the two is poor, resulting in a weak antistatic effect. Summary of the invention

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

[0005] In order to achieve the purpose of the present invention, the present invention adopts the following technical solutions:

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

[0007] S1, dibasic acid, diamine or lactam, and end-capping agent react to obtain a dicarboxyl-terminated nylon hard segment;

[0008] S2, reacting the dicarboxyl-terminated nylon hard segment and the polyether polyol under the action of catalyst 1 to generate a dicarboxyl-terminated nylon elastomer with a certain molecular weight;

[0009] S3, reacting a dicarboxyl-terminated nylon elastomer and a diamino-terminated aminoguanidine compound under the action of catalyst 2 to generate a diamino-terminated nylon elastomer having a guanidine group;

[0010] S4. Impregnating the diamino-terminated nylon elastomer having guanidino groups with an anionic antistatic agent solution to obtain the nylon elastomer having good dyeability, antibacterial properties and antistatic properties according to the present invention.

[0011] In an embodiment of the method of the present invention, the dibasic acid in step S1 comprises C5-C 18 One or more of the dibasic acids, preferably any one or a combination of two or more of adipic acid, sebacic acid, and dodecanedioic acid;

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

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

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

[0015] The reaction conditions for preparing the dicarboxyl-terminated nylon hard segment described in S1 are: after adding the dibasic acid, diamine or lactam, and the end-capping agent into the polymerization kettle, the air in the reactor is removed, the temperature is raised to 220-270°C, the pressure in the reactor is 2-4MPa, and the reaction is carried out for 4-8h, the pressure is released to normal pressure, and the absolute pressure is evacuated to 5-10kpa;

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

[0017] In an embodiment of the method of the present invention, in step S2, in order to ensure that a dicarboxyl-terminated nylon elastomer is obtained, the molar ratio of the dicarboxyl-terminated nylon hard segment 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 polybutylene glycol, preferably a polyether polyol with a molecular weight of 500-2000 g / mol;

[0019] The catalyst 1 is selected from the general formula M(OR) n Metal alkoxide, M is Sb, Ti, Zr or Ge, R is C 1～10 An alkyl group, wherein n is 1 to 4, preferably 4;

[0020] The amount of catalyst 1 added is 0.01wt% to 0.5wt% 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° C. and a vacuum degree of less than 500 PaA for 2-6 hours to obtain a dicarboxyl-terminated nylon elastomer with a molecular weight preferably of 15000-46000 g / mol.

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

[0023] The molar ratio of the dicarboxyl-terminated nylon elastomer to the diamino-terminated aminoguanidine compound is about 1:2, ensuring that the nylon elastomer is diamino-terminated;

[0024] The diamino-terminated aminoguanidine compounds include but are not limited to polyhexamethyleneguanidine, agmatine, and aminoguanidine, preferably polyhexamethyleneguanidine with a linear molecular chain structure; the polyhexamethyleneguanidine structure has three linear types, as shown below:

[0025]

[0026] The added catalyst 2 is: phosphoric acid, phosphorous acid, hypophosphorous acid and their salt derivatives, preferably sodium hypophosphite;

[0027] 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;

[0028] In the step S4 of the embodiment of the method of the present invention, the diamino-terminated nylon elastomer having guanidino groups is impregnated with an anionic antistatic agent solvent;

[0029] The anionic antistatic agent is selected from phosphates, alkyl sulfonates, and alkyl phosphates, preferably alkyl sulfonates.

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

[0031] The invention obtains a nylon elastomer having a diamino terminal and containing a guanidine group by copolymerizing a diamino terminal aminoguanidine compound with a nylon elastomer, and impregnates the nylon elastomer with an anionic antistatic agent. The obtained nylon elastomer has good dyeing performance, stable antibacterial effect and strong antistatic property. DETAILED DESCRIPTION

[0032] In order to better understand the technical solution of the present invention, the content of the present invention is further described below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments;

[0033] The following test methods are used in each example of the present invention:

[0034] (1) Antibacterial method: According to GB / T 31402-2015, the selected bacterial species was Staphylococcus aureus (10 5 CFU / mL), culture temperature: 37°C, culture time: 24h;

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

[0036] (3) Dye uptake: Use a UV-visible spectrophotometer to measure the absorbance of the dye solution at the maximum absorption wavelength before and after dyeing, and calculate the dye uptake according to the following formula:

[0037]

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

[0039] In the following examples and comparative examples, nylon elastomer pellets are fed into the inlet of a screw extruder or a mesh spinning head to be melted, homogenized and pressurized, and the melted nylon elastomer is spun into fibers for fine weaving to obtain nylon elastomer fabrics, and the nylon elastomer fabrics are dyed using Eriofast reactive dyes (pH value is 5.0), wherein the process flow of the dyeing stage is: heating to 95°C at 1.0°C / min for 40min of heat preservation and dyeing, and cooling to below 50°C at 2.0°C / min. After dyeing, soaping is performed at 60°C for 10min, with 2g / L of soaping agent and 2g / L of sodium carbonate.

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

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

[0042] raw material factory other Decanediamine Shandong Chiyue Chemical Co., Ltd. Industrial Grade Sebacic acid Shanghai Cathay Biotechnology Co., Ltd. Industrial Grade Adipic acid Huafeng Group Co., Ltd. Industrial Grade Dodecanedioic acid Shandong Guangtong New Materials Co., Ltd. Industrial Grade Lauryl lactam Wanhua Chemical Group Co., Ltd. Industrial Grade Caprolactam China Pingmei Shenma Group Industrial Grade Polybutylene glycol BASF SE Industrial Grade Polyethylene glycol BASF SE Industrial Grade Polypropylene glycol BASF SE Industrial Grade Polyhexamethyleneguanidine Shanghai Gaoju Biotechnology Co., Ltd. Industrial Grade Agmatine 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 reacted in a polymerization reactor at a temperature of 220° C. and a pressure of 2.0 MPa for 7 h, and the pressure was slowly released to normal pressure and then evacuated to an absolute pressure of 5 kPa to obtain a dicarboxyl-terminated nylon 1010 hard segment having a number average molecular weight of 5000 g / mol;

[0045] (2) 7.89 kg of the dicarboxyl-terminated nylon 1010 hard segment prepared in step (1), 2.11 kg of polypropylene glycol (number average molecular weight 2000 g / mol), and 27 g of tetraethoxygermanium were added into a polymerization reactor, stirring was started, the temperature was raised to 200° C., and the vacuum degree was controlled at 50 PaA for 6 h to prepare a dicarboxyl-terminated nylon elastomer with a number average molecular weight of 19000 g / mol;

[0046] (3) 9.57 kg of dicarboxyl-terminated nylon elastomer prepared in step (2), 0.43 kg of polyhexamethylene guanidine ((a) structure, number average molecular weight 423 g / mol, the same below), and 15 g of phosphorous acid are put into a reaction kettle. After nitrogen replacement, stirring is started and the temperature is raised to 240° C. for reaction for 5 h. After pressure relief, a vacuum pump is used to evacuate the reaction for 1 h. The positive pressure in the kettle is restored, and the strands are immersed in an alkyl sulfonate solution and then cut into pellets using a pelletizer to obtain a nylon elastomer resin 1 with good dyeability and antibacterial properties.

[0047] Example 2

[0048] (1) 8.54 kg of caprolactam, 1.46 kg of adipic acid, and 1 kg of water were added to a polymerization reactor, reacted at 260° C. and 3.5 MPa for 6 h, slowly released the pressure to normal pressure, and evacuated to an absolute pressure of 8 kPa to obtain a dicarboxyl-terminated nylon 66 hard segment with a number average molecular weight of 1000 g / mol;

[0049] (2) 5.33 kg of dicarboxyl-terminated nylon 66 hard segment prepared in step (1), 4.67 kg of polybutylene glycol (number average molecular weight 1000 g / mol), and 10 g of zirconium n-propoxide were placed in a polymerization reactor for nitrogen replacement, stirring was started and the temperature was raised to 240° C., and the vacuum degree was controlled at 200 PaA for 4 hours to prepare a dicarboxyl-terminated 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 agmatine (number average molecular weight 130 g / mol) and 20 g of sodium hypophosphite are put into a reaction kettle. After nitrogen replacement, stirring is started and the temperature is raised to 230° C. for reaction for 2.5 hours. After pressure relief, a vacuum pump is used to evacuate the reaction for 1.5 hours. The positive pressure in the kettle is restored, and the strands are immersed in an alkyl sulfonate solution and then pelletized using a pelletizer to obtain a nylon elastomer resin 2 with good dyeability and antibacterial properties.

[0051] Example 3

[0052] (1) 9.798 kg of lauryl lactam, 0.202 kg of sebacic acid and 1 kg of water were placed in a polymerization reactor, reacted at a temperature of 270° C. and a pressure of 3.8 MPa for 8 h, and then slowly released the pressure to normal pressure and evacuated to an absolute pressure of 10 kPa to obtain a dicarboxyl-terminated nylon 12 hard segment with a number average molecular weight of 10,000 g / mol;

[0053] (2) 8.696 kg of the dicarboxyl-terminated nylon 12 hard segment prepared in step (1), 1.304 kg of polyethylene glycol (number average molecular weight 2000 g / mol), and 50 g of ethoxy antimony were placed in a polymerization kettle for nitrogen replacement. After the replacement, the kettle temperature was raised to 260° C. and the vacuum degree was controlled at 500 PaA for reaction for 6 hours to prepare a dicarboxyl-terminated nylon elastomer with a number average molecular weight of 46000 g / mol;

[0054] (3) 9.819 kg of dicarboxyl-terminated nylon elastomer prepared in step (2), 0.181 kg of polyhexamethylene guanidine, and 15 g of phosphoric acid are put into a reaction kettle and replaced with nitrogen. Then stirring is started and the temperature is raised to 270° C. for reaction for 5 h. After the pressure is released, a vacuum pump is used to evacuate the reaction for 3 h. The positive pressure in the kettle is restored. The strands are immersed in an alkyl sulfonate solution and then cut into pellets using a pelletizer to obtain a nylon elastomer resin 3 with good dyeability and antibacterial properties.

[0055] Example 4

[0056] (1) 3.33 kg of decanediamine, 6.67 kg of dodecanedioic acid, and 5 kg of water were added to a polymerization reactor, and the reaction was carried out at a temperature of 260° C. and a pressure of 3.2 MPa for 4 h. The pressure was slowly released to normal pressure, and then vacuumed to an absolute pressure of 5 kPa to obtain a dicarboxyl-terminated nylon 1012 hard segment with a number average molecular weight of 1000 g / mol;

[0057] (2) 6.875 kg of the dicarboxyl-terminated nylon 1012 hard segment prepared in step (1), 3.125 kg of polybutylene glycol (number average molecular weight 500 g / mol), and 40 g of tetrabutyl titanate were placed in a polymerization reactor, replaced with nitrogen, stirred, and heated to 220° C. The vacuum degree was controlled at 100 PaA, and the reaction was carried out for 6 hours to prepare a dicarboxyl-terminated nylon elastomer with a molecular weight of 16000 g / mol;

[0058] (3) 9.84 kg of dicarboxyl-terminated nylon elastomer prepared in step (2), 0.16 kg of agmatine (number average molecular weight 130 g / mol), and 10 g of phosphorous acid are put into a reactor, replaced with nitrogen, stirred, and heated to 200° C. for reaction for 5 h. After the pressure is released, a vacuum pump is used to evacuate the reaction for 2 h. The positive pressure in the reactor is restored, and the strands are immersed in an alkyl sulfonate solution and cut into pellets using a pelletizer to obtain a nylon elastomer resin 4 with good dyeability and antibacterial properties.

[0059] Example 5

[0060] (1) 9.635 kg of laurolactam, 0.365 kg of adipic acid, and 1 kg of water were placed in a polymerization reactor, reacted at a temperature of 260° C. and a pressure of 3.2 MPa for 4 h, and then slowly released the pressure to normal pressure and evacuated to an absolute pressure of 7 kPa to obtain a dicarboxyl-terminated nylon 12 hard segment with a number average molecular weight of 4000 g / mol;

[0061] (2) 8.276 kg of the dicarboxyl-terminated nylon 12 hard segment prepared in step (1), 1.724 kg of polybutylene glycol (number average molecular weight 1000 g / mol), and 30 g of zirconium n-butoxide were placed in a polymerization reactor, replaced with nitrogen, stirred, heated to 230° C., and the vacuum degree was controlled at 100 PaA. The reaction was carried out for 5 h to prepare a dicarboxyl-terminated nylon elastomer with a molecular weight of 29000 g / mol;

[0062] (3) 9.716 kg of dicarboxyl-terminated nylon elastomer prepared in step (2), 0.284 kg of polyhexamethylene guanidine, and 15 g of phosphorous acid are put into a reaction kettle and replaced with nitrogen. Stirring is started and the temperature is raised to 240° C. for reaction for 5 h. After the pressure is released, a vacuum pump is used to evacuate the reaction for 2 h. The positive pressure in the kettle is restored. The strands are immersed in an anionic antistatic solution and then cut into pellets using a pelletizer to obtain a 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 added to a polymerization reactor, reacted at a temperature of 220° C. and a pressure of 2.0 MPa for 7 h, and then slowly released the pressure to normal pressure and evacuated to an absolute pressure of 5 kPa to obtain a dicarboxyl-terminated nylon 1010 hard segment with a number average molecular weight of 5000 g / mol;

[0065] (2) 7.89 kg of the dicarboxyl-terminated nylon 1010 hard segment prepared in step (1), 2.11 kg of polypropylene glycol (number average molecular weight 2000 g / mol), and 27 g of tetraethoxygermanium were added to a polymerization kettle, stirring was started, the temperature was raised to 200° C., and the vacuum degree was controlled at 50 PaA for 6 hours to prepare a dicarboxyl-terminated ordinary nylon elastomer resin 1 with a number average molecular weight of 19000 g / mol.

[0066] Comparative Example 2

[0067] (1) 9.635 kg of laurolactam, 0.365 kg of adipic acid, and 1 kg of water were placed in a polymerization reactor, reacted at a temperature of 260° C. and a pressure of 3.2 MPa for 4 h, and then slowly released the pressure to normal pressure and evacuated to an absolute pressure of 7 kPa to obtain a dicarboxyl-terminated nylon 12 hard segment with a number average molecular weight of 4000 g / mol;

[0068] (2) 8.276 kg of the dicarboxyl-terminated nylon 12 hard segment prepared in step (1), 1.724 kg of polybutylene glycol (number average molecular weight 1000 g / mol), and 30 g of zirconium n-butoxide were placed in a polymerization reactor, replaced with nitrogen, stirred, heated to 230° C., and the vacuum degree was controlled at 100 PaA. The reaction was carried out for 5 h to prepare a dicarboxyl-terminated 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 dicarboxyl-terminated nylon elastomer prepared in step (2) are blended by a twin-screw extruder and then drawn into strands and pelletized 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, surface resistivity of Examples 1-5 and Comparative Examples 1-2

[0072]

[0073] It is easy to understand that the above embodiments are only examples for clear explanation and do not mean that the present invention is limited thereto. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the protection scope of the present invention.

Claims

1. A method for preparing a nylon elastomer, characterized in that: The following steps are included: S1, dibasic acid, diamine or lactam, and end-capping agent react to obtain a dicarboxyl-terminated nylon hard segment; S2, reacting the dicarboxyl-terminated nylon hard segment and the polyether polyol under the action of catalyst 1 to generate a dicarboxyl-terminated nylon elastomer with a certain molecular weight; S3, reacting a dicarboxyl-terminated nylon elastomer and a diamino-terminated aminoguanidine compound under the action of catalyst 2 to generate a diamino-terminated nylon elastomer having a guanidine group; S4. Impregnating the diamino-terminated nylon elastomer having guanidino groups with 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 dibasic acid comprises C5-C 18 One or more of the dibasic acids, preferably any one or a combination of two or more of adipic acid, sebacic acid, and dodecanedioic acid; and / or The end-capping agent includes C5-C 18 The dibasic acid is preferably one or more of adipic acid, sebacic acid and dodecanedioic acid.

3. 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, preferably any one or a combination of hexamethylenediamine and decanediamine; and / or The lactam includes at least one of caprolactam and laurolactam.

4. The preparation method according to any one of claims 1 to 3, characterized in that The reaction conditions of step S1 are as follows: after adding the dibasic acid, diamine or lactam and the end-capping agent into the polymerization kettle, the air in the reactor is removed, the temperature is raised to 220-270°C, the pressure in the reactor is 2-4MPa, the reaction is carried out for 4-8h, the pressure is released to normal pressure, and the absolute pressure is evacuated to 5-10kpa; Preferably, the number average molecular weight of the dicarboxyl terminated nylon hard segment is 1000-10000 g / mol.

5. The preparation method according to claim 1, characterized in that: In step S2, the molar ratio of the dicarboxyl-terminated nylon hard segment to the polyether polyol is (1.1-1.5):1; The polyether polyol is selected from one or more of polyethylene glycol, polypropylene glycol or polybutylene glycol, preferably a polyether polyol with a molecular weight of 500-2000 g / mol.

6. The preparation method according to claim 1 or 5, characterized in that: In step S2, the added catalyst 1 accounts for 0.01wt% to 0.5wt% of the total of the dicarboxyl-terminated nylon hard segment and the polyether polyol; The catalyst 1 is preferably selected from the general formula M(OR) n wherein M is Sb, Ti, Zr or Ge, and R is C 1～10 An alkyl group, wherein n is 1 to 4, preferably 4; Preferably, the reaction is carried out at a temperature of 200-260° C. and a vacuum degree of less than 500 PaA for 2-6 hours to obtain a dicarboxyl-terminated nylon elastomer having a molecular weight of preferably 15000-46000 g / mol.

7. The preparation method according to claim 1, characterized in that: In step S3, the diamino-terminated aminoguanidine compound includes at least one of polyhexamethyleneguanidine, agmatine, and aminoguanidine, preferably polyhexamethyleneguanidine; the structure of the polyhexamethyleneguanidine is as follows:

8. The preparation method according to claim 1 or 7, characterized in that: In step S3, the reaction is carried out at 200-270° C. for 2-5 hours, and then the reaction is carried out under vacuum and reduced pressure for 1-3 hours; Preferably, the molar ratio of the dicarboxyl-terminated nylon elastomer to the diamino-terminated aminoguanidine compound is 1:

2.

9. The preparation method according to claim 1, 7 or 8, characterized in that: In step S3, the catalyst 2 is selected from phosphoric acid, phosphorous acid, hypophosphorous acid and their salt derivatives, preferably sodium hypophosphite; Preferably, 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.

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

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