A hydrophobic nylon elastomer and a method of making the same

Abstract

The application provides a hydrophobic nylon elastomer and a preparation method thereof. The method comprises the following steps: preparing a dicarboxyl-terminated nylon hard segment; performing an esterification reaction on the dicarboxyl-terminated nylon hard segment, a polyether polyol and a mono-acid end-capping agent to prepare a single-carboxyl-terminated nylon elastomer; and reacting the single-carboxyl-terminated nylon elastomer and an epoxy vegetable oil to prepare a multi-arm nylon elastomer epoxy vegetable oil copolymer, i.e. the hydrophobic nylon elastomer. The hydrophobic nylon elastomer prepared by the application has a high molecular weight, and meanwhile, a flexible hydrophobic chain segment is introduced, so that the water absorption rate is very low while the high toughness material is maintained, and the size stability is good.

Description

Technical Field

[0001] This invention relates to the field of nylon materials, specifically to a hydrophobic nylon elastomer and its preparation method. Background Technology

[0002] Thermoplastic elastomers are polymeric materials that fall between resins and rubber, combining the properties of both. They are widely used in various industries. Nylon elastomers, as the pinnacle of thermoplastic elastomers, are block copolymers synthesized from highly crystalline nylon as the hard segment and compliant polyether polyols or polyester polyols as the soft segment. They belong to the regular AB type block copolymers and have properties such as high resilience, low temperature resistance, and anti-aging. They are widely used in footwear, sports equipment, antistatic agents, medical catheters, industrial components, and other fields. However, because the soft segments are made of polyether polyols or polyester polyols, which are hydrophilic groups, the resulting nylon elastomers have a high water absorption rate and poor dimensional stability, which limits their application range.

[0003] CN113024802B discloses a thermoplastic nylon elastomer containing amorphous nylon segments with a pyrrolidone structure. It replaces the polyether polyol or polyester polyol in the soft segments of conventional nylon elastomers with amorphous nylon segments containing a pyrrolidone structure to improve the high water absorption rate of nylon elastomers. This patented nylon elastomer is fundamentally different from conventional nylon elastomers. The soft segments have changed from polyether linear chains to amorphous nylon segments containing heterocycles, which inevitably affects the performance. For example, the rebound and compression set will be worse, thus limiting its application range.

[0004] In summary, nylon elastomers currently prepared from polyether polyols or polyester polyols still suffer from high water absorption. Switching to other soft segments significantly impacts their performance, thus limiting their application range. This issue urgently needs to be addressed. Summary of the Invention

[0005] In order to overcome the problems of the prior art, one of the objectives of the present invention is to provide a method for preparing a hydrophobic nylon elastomer. The material prepared by the method has a low water absorption rate and good dimensional stability while maintaining a high molecular weight and good toughness.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A method for preparing a hydrophobic nylon elastomer, the method comprising the following steps:

[0008] S1: Preparation of nylon hard segments with dicarboxyl groups at the end;

[0009] S2: A nylon elastomer with monocarboxyl-terminated segments is prepared by esterification of dicarboxyl-terminated nylon hard segments, polyether polyols, and monoacid end-capping agents.

[0010] S3: A single-carboxyl-terminated nylon elastomer reacts with an epoxy vegetable oil to form a multi-arm nylon elastomer epoxy vegetable oil copolymer, i.e., a hydrophobic nylon elastomer.

[0011] The method of the present invention can effectively reduce the water absorption rate of the material by introducing hydrophobic multi-arm epoxy plant oil, while increasing its degree of polymerization, reducing the polymerization difficulty of nylon elastomer, and the epoxy plant oil itself is a flexible chain segment, which does not change the characteristics of nylon elastomer as a high toughness material.

[0012] In one embodiment of the present invention, the dicarboxyl-terminated nylon in S1 is prepared by reacting nylon hard segments with a diacid; preferably, the number average molecular weight of the dicarboxyl-terminated nylon is 500-5000; preferably, the nylon hard segments are nylon prepared from C4-C24 raw materials, preferably one or more of nylon 6, nylon 66, nylon 56, nylon 610, nylon 510, nylon 612, nylon 614, nylon 512, nylon 1010, nylon 1012, nylon 1212, nylon 11, and nylon 12; preferably, the diacid is a C4-C20 acid, preferably one or more of adipic acid, sebacic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and tetradecanoic acid.

[0013] In one embodiment of the present invention, the polyether polyol in S2 is a polyether polyol with repeating units C2-C8, preferably one or more of polyethylene glycol, polypropylene glycol, and polybutanediol.

[0014] In one embodiment of the present invention, the single acid capping agent in S2 is C. x H 2x O2 monocarboxylic acid, where x takes the value of an integer from 1 to 16, preferably an integer from 2 to 6.

[0015] In one embodiment of the present invention, the molecular weight of the nylon elastomer with a single carboxyl group at the end, S2, is 5,000-30,000.

[0016] In one embodiment of the present invention, the S2 esterification reaction is carried out for 2-10 hours under a vacuum absolute pressure ≤500 PaA.

[0017] In one embodiment of the invention, a catalyst is added in S2; preferably, the catalyst is a metal alkoxide M(OR). n Wherein, M is a transition metal element, preferably one or more of Sb, Ti, Zr, and Ge, R is a C1-C10 alkyl group, and n is an integer from 1 to 4, preferably an integer from 2 to 4; preferably, the catalyst addition amount is 0.01wt%-0.3wt% of the total amount of carboxyl-terminated nylon hard segments, polyether polyols, and monoacid end-capping agents.

[0018] In this invention, various commonly used additives can be added, such as antioxidants and ultraviolet absorbers in S2; based on the total mass of the dicarboxyl-terminated nylon hard segment, polyether polyol, and monoacid-terminated group as 100%, the amount of additive added is 0.01wt%-0.3wt%. The addition of additives is well known in the art.

[0019] In one embodiment of the present invention, the epoxidized vegetable oil in S3 is an oil-based epoxidized compound, preferably one or more of epoxidized soybean oil, epoxidized castor oil, and epoxidized corn oil.

[0020] In one embodiment of the present invention, the molar ratio of the number of carboxyl groups in the monocarboxyl-terminated nylon elastomer in S3 to the molar ratio of the number of epoxy groups in the epoxy vegetable oil is (0.95-1.05):1.

[0021] In one embodiment of the present invention, the reaction conditions for S3 are 160-260°C and the reaction time is 1-6h.

[0022] In one embodiment of the present invention, a catalyst is added in S3; preferably, the catalyst is a nitrogen-containing heterocyclic compound, more preferably an imidazole catalyst; preferably, the amount of catalyst added is 0.01wt%-0.1wt% of the total amount of monocarboxyl-terminated nylon elastomer and epoxidized vegetable oil.

[0023] Another object of the present invention is to provide a hydrophobic nylon elastomer.

[0024] A hydrophobic nylon elastomer is provided, which is prepared by the method described above. The hydrophobic nylon elastomer is a multi-arm nylon elastomer-epoxy vegetable oil copolymer. This polymer structure is also represented as ABz, where A represents the epoxy vegetable oil, B represents the nylon elastomer, and z represents the number of nylon elastomers in one segment, i.e., the number of arms. The value of z is ≥2. The following uses epoxy soybean oil, nylon 12 elastomer, and their products as examples, with the structural formula shown below:

[0025] Epoxidized soybean oil

[0026]

[0027] Monocarboxyl-terminated nylon elastomers are produced by reacting dicarboxyl-terminated nylon, polyethylene glycol, and acetic acid, as shown in the diagram below:

[0028]

[0029] The schematic diagram of the structure of the multi-arm nylon elastomer-epoxy soybean oil copolymer formed by the reaction of epoxidized soybean oil and monocarboxyl-terminated nylon elastomer.

[0030] As shown below:

[0031]

[0032] Another object of the present invention is to provide a use of a hydrophobic nylon elastomer.

[0033] Uses of a hydrophobic nylon elastomer, the elastomer being prepared by the method described above, or being the elastomer described above, the elastomer being used in waterproof shoes, food packaging, cable sheaths, and sporting goods.

[0034] Compared with the prior art, the present invention has the following positive effects:

[0035] By introducing hydrophobic multi-arm epoxy plant oil, the water absorption rate of the material can be effectively reduced, and hydrophobic nylon elastomers can be prepared. At the same time, the multi-arm structure increases its degree of polymerization, reduces the polymerization difficulty of nylon elastomers, and the epoxy plant oil itself is a flexible chain segment, which does not change the characteristics of nylon elastomers as high-toughness materials. Attached Figure Description

[0036] Figure 1 The contact angle test diagram is for the nylon elastomer resin prepared in Example 1;

[0037] Figure 2 The contact angle test diagram of the nylon elastomer resin prepared for Comparative Example 1.

[0038] Figure 3 Infrared spectra of epoxidized soybean oil, monocarboxyl-terminated nylon elastomer, and hydrophobic nylon elastomer resin 1. Detailed Implementation

[0039] 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;

[0040] The following test methods are used in various embodiments of the present invention:

[0041] (1) Contact angle test method: GB / T 30693-2014 standard is adopted, and the equipment is an optical contact angle measuring instrument;

[0042] (2) Water absorption test method: ISO62 standard was adopted, and the soaking conditions were 23℃ for 24h.

[0043] (3) Test method for elongation at break: ISO527 standard is adopted, the equipment is a universal testing machine, and the tensile rate is 500 mm / min;

[0044] (4) Infrared testing method: GB / T 6040 standard was adopted, and the testing instrument was a Fourier transform total reflectance infrared spectrometer, with the scanning parameters set to a wavelength of 500–4000 cm⁻¹. -1 The absorption curve was measured.

[0045] The raw materials used in the following examples and comparative examples are all commercially available chemicals of industrial grade purity. The epoxy equivalent of epoxidized soybean oil is 267, that of epoxidized corn oil is 271, and that of epoxidized castor oil is 284.

[0046] Product Name factory Specification Epoxy equivalent Epoxidized soybean oil Zibo Kailian Chemical Co., Ltd. Industrial grade 267 Epoxy corn oil Zibo Kailian Chemical Co., Ltd. Industrial grade 271 Epoxy castor oil Zibo Kailian Chemical Co., Ltd. Industrial grade 284 Polyether polyols BASF AG Industrial grade / monoacids Shandong Unitech Industrial grade / dicarboxylic acid Shenma Shares Industrial grade / imidazole Jiangsu Kang Lejia Industrial grade / Esterification catalyst Shandong Dongfang Riqi Industrial grade /

[0047] Example 1

[0048] (1) 5.55 kg dodecyl lactam, 1.65 kg dodecanoic acid and 6 kg water were added into the polymerization reactor. The reaction conditions were 290 °C and 4.2 MPaG for 2 h to obtain dicarboxyl-terminated nylon 12 hard segments with a number average molecular weight of 1000.

[0049] (2) 5 kg of dicarboxylated nylon 12 hard segments prepared in step (1), 5 kg of polyethylene glycol (PEG-1000), 60 g of acetic acid, 10 g of antimony glycolate and 10 g of antioxidant (1098) were put into the polymerization reactor and purged with nitrogen three times. Then the temperature was raised to 270°C and the reaction was carried out under the condition of 100 PaA vacuum for 6 h to prepare monocarboxylated nylon elastomer with a number average molecular weight of 10,000.

[0050] (3) 20 kg of monocarboxyl-terminated nylon elastomer, 534 g of epoxidized soybean oil, and 10.267 g of N,N-carbonyldiimidazole prepared in step (2) were added into the reactor. After the reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 220°C. After reacting for 3 hours, hydrophobic nylon elastomer resin 1 was obtained through the discharge port.

[0051] Example 2

[0052] (1) 7.4 kg dodecyl lactam, 2.7 kg adipic acid and 8 kg water were added into the polymerization reactor. The reaction conditions were 300 °C and 4.5 MPaG for 6 h to obtain dicarboxyl-terminated nylon 12 hard segments with a number average molecular weight of 500.

[0053] (2) 5 kg of dicarboxylate-terminated nylon 12 hard segments, 5 kg of polybutanediol (PTMG-500), 46 g of formic acid, 1 g of zirconium propoxide, and 20 g of antioxidant (1010) prepared in step (1) were added into the polymerization reactor and purged with nitrogen three times. After purging the polymerization reactor with nitrogen three times, the stirring was turned on and the temperature was raised to 280°C. The vacuum was drawn to an absolute pressure of 50 PaA and the reaction was carried out for 2 hours to obtain a monocarboxylate-terminated nylon elastomer with a molecular weight of 5000.

[0054] (3) 10 kg of monocarboxyl-terminated nylon elastomer, 542 g of epoxy corn oil, and 10.542 g of 1-methylimidazole prepared in step (2) were added into the reactor. After the reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 160°C. After reacting for 6 hours, hydrophobic nylon elastomer resin 2 was obtained through the discharge port.

[0055] Example 3

[0056] (1) 4.641 kg of decanediamine, 6.681 kg of dodecanoic acid and 8 kg of water were placed in a polymerization reactor and reacted for 9 h at a temperature of 210 °C and a pressure of 1.8 MPaG to obtain dicarboxyl-terminated nylon 1012 hard segments with a number average molecular weight of 5000.

[0057] (2) 15 kg of dicarboxylated nylon 1012 hard segments prepared in step (1), 6 kg of polypropylene glycol (PPG-2000), 256 g of hexadecanoic acid, 63.6 g of tetraethyl germanium, 10 g of antioxidant (1098), and 10 g of antioxidant (168) were added into the polymerization reactor. After the polymerization reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 220°C. The vacuum was drawn to an absolute pressure of 500 PaA and the reaction was carried out for 10 h to obtain a monocarboxylated nylon elastomer with a number average molecular weight of 30,000.

[0058] (3) 2.85 kg of monocarboxyl-terminated nylon elastomer, 284 g of epoxy castor oil, and 0.33 g of 2-ethyl-4-methylimidazole prepared in step (2) were added into the reactor. After the reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 260°C. After reacting for 1 hour, hydrophobic nylon elastomer resin 3 was obtained through the discharge port.

[0059] Example 4

[0060] (1) 8.6 kg of decanediamine, 13.8 kg of dodecanoic acid and 18 kg of water were put into the polymerization reactor. The reaction conditions were 255 °C and 3.2 MPaG for 4 h to obtain the dicarboxyl-terminated nylon 1012 hard segment with a number average molecular weight of 2000.

[0061] (2) 6 kg of dicarboxylated nylon 1012 hard segments prepared in step (1), 9 kg of polyethylene glycol (PEG-3000), 172 g of decanoic acid, 15 g of tetrabutyl titanate, 10 g of antioxidant (1098), and 5 g of antioxidant (168) were added into the polymerization reactor. After the polymerization reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 180°C. The vacuum was drawn to an absolute pressure of 80 PaA and the reaction was carried out for 7 h to obtain a monocarboxylated nylon elastomer with a molecular weight of 15,000.

[0062] (3) 23.625 kg of monocarboxyl-terminated nylon elastomer, 400.5 g of epoxidized soybean oil, and 11.45 g of N,N-carbonyldiimidazole prepared in step (2) were added into the reactor. After the reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 200°C. After reacting for 4 hours, hydrophobic nylon elastomer resin 4 was obtained through the discharge port.

[0063] Example 5

[0064] (1) 9.25 kg dodecyl lactam, 2.55 kg sebacic acid and 11 kg water were added into the polymerization reactor. The reaction conditions were 275 °C and 3.6 MPaG for 3 h to obtain nylon 12 hard segments with dicarboxyl end caps and a number average molecular weight of 1000.

[0065] (2) 8 kg of dicarboxylated nylon 12 hard segments prepared in step (1), 16 kg of polyethylene glycol (PEG-2000), 88 g of butyric acid, 12 g of tetrabutyl titanate, and 12 g of antioxidant (1098) were put into the polymerization reactor. After the polymerization reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 265°C. The vacuum was drawn to an absolute pressure of 250 PaA. After reacting for 4 h, a monocarboxylated nylon elastomer with a number average molecular weight of 24,000 was obtained.

[0066] (3) 24 kg of monocarboxyl-terminated nylon elastomer, 267 g of epoxidized soybean oil, and 7.28 g of N,N-carbonyldiimidazole prepared in step (2) were added into the reactor. After the reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 240°C. After reacting for 2 hours, hydrophobic nylon elastomer resin 5 was obtained through the discharge port.

[0067] Example 6

[0068] (1) 9.28 kg hexamethylenediamine, 23.25 kg tetradecanoic acid and 10 kg water were put into the polymerization reactor. The reaction conditions were 255 °C and 3.2 MPaG for 4 h to obtain the dicarboxyl-terminated nylon 614 hard segment with a number average molecular weight of 3000.

[0069] (2) 12 kg of dicarboxyl-terminated nylon 614 hard segments prepared in step (1), 4 kg of polyethylene glycol (PEG-1000), 60 g of acetic acid, 32 g of antimony glycol, 16 g of antioxidant 1098 and 32 g of UV-resistant additive UV312 were added into the polymerization reactor. After the polymerization reactor was purged with nitrogen three times, the stirring was turned on and the temperature was raised to 265°C. The vacuum was drawn to an absolute pressure of 20 PaA and the reaction was carried out for 4 hours to obtain a monocarboxyl-terminated nylon elastomer with a molecular weight of 16,000.

[0070] (3) 32 kg of monocarboxyl-terminated nylon elastomer, 534 g of epoxidized soybean oil, and 22.78 g of N,N-carbonyldiimidazole prepared in step (2) were added into the reactor. After the reactor was replaced with nitrogen three times, the stirring was turned on and the temperature was raised to 180°C. After reacting for 5 hours, hydrophobic nylon elastomer resin 6 was obtained through the discharge port.

[0071] The hydrophobic nylon elastomer resins 2-6 prepared in the above embodiments have contact angles similar to those of the hydrophobic nylon elastomer resin 1. Figure 1 The image shows the contact angle spectrum of hydrophobic nylon elastomer resin 1. Figure 3 The infrared spectra of epoxidized soybean oil, monocarboxyl-terminated nylon elastomer, and hydrophobic nylon elastomer resin 1 are shown, with the 827 cm⁻¹ value being the highest. -1 The peak at 1640 cm⁻¹ is a characteristic peak for epoxy groups. -1 The peak at the position is a characteristic peak of the amide bond. As can be seen from the attached figure, the characteristic peak of the epoxy group at resin 1 has disappeared, indicating that the monocarboxyl-terminated nylon elastomer has reacted with epoxidized soybean oil to form hydrophobic nylon elastomer resin 1. The contact angles and infrared spectra of other resins are not listed here.

[0072] Comparative Example 1

[0073] Compared with Example 1, the only difference is that hydrophobic segments are not grafted.

[0074] (1) 5.55 kg dodecyl lactam, 1.65 kg dodecanoic acid and 6 kg water were added into the polymerization reactor. The reaction conditions were 290 °C and 4.2 MPaG for 2 h to obtain dicarboxyl-terminated nylon 12 hard segments with a number average molecular weight of 1000.

[0075] (2) 5 kg of dicarboxylated nylon 12 hard segments prepared in step (1), 5 kg of polyethylene glycol (PEG-1000), 60 g of acetic acid, 10 g of antimony glycolate and 10 g of antioxidant (1098) were put into the polymerization reactor and purged with nitrogen three times. The temperature was raised to 270°C and the reaction was carried out under the condition of 100 PaA vacuum for 6 h to prepare monocarboxylated nylon elastomer 1-1 with a number average molecular weight of 10,000.

[0076] The contact angle spectrum of the obtained nylon elastomer resin 1-1 is as follows: Figure 2 As shown in the image.

[0077] The water absorption rate and elongation at break of the nylon elastomer resin prepared above were tested, and the results are shown in Table 1 below.

[0078] Table 1

[0079] Water absorption rate (%) Elongation at break (%) Nylon elastomer resin 1 1.2 ＞500 Nylon elastomer resin 2 0.4 ＞500 Nylon elastomer resin 3 0.72 ＞500 Nylon elastomer resin 4 1.1 ＞500 Nylon elastomer resin 5 1.21 ＞500 Nylon elastomer resin 6 0.7 ＞500 Nylon elastomer resin 1-1 35 ＞500

[0080] As shown in Table 1, the nylon elastomer prepared by this method can effectively reduce the water absorption rate of the material and prepare a hydrophobic nylon elastomer. At the same time, the multi-arm structure improves its degree of polymerization and reduces the polymerization difficulty of the nylon elastomer. Furthermore, the epoxy vegetable oil itself is a flexible chain segment, which does not change the characteristics of the nylon elastomer as a high-toughness material.

[0081] 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 hydrophobic nylon elastomer, characterized in that, The method includes the following steps: S1: Preparation of nylon hard segments with dicarboxyl groups at the end; S2: A nylon elastomer with monocarboxyl-terminated segments is prepared by esterification of dicarboxyl-terminated nylon hard segments, polyether polyols, and monoacid end-capping agents. S3: A single carboxyl-terminated nylon elastomer reacts with an epoxy vegetable oil to form a multi-arm nylon elastomer epoxy vegetable oil copolymer, i.e., a hydrophobic nylon elastomer. Among them, the molecular weight of the nylon elastomer with a single carboxyl group at the end described in S2 is 5,000-30,000; In S3, the molar ratio of the number of carboxyl groups in the single-carboxyl-terminated nylon elastomer to the molar ratio of the number of epoxy groups in the epoxy vegetable oil is (0.95-1.05):

1.

2. The method according to claim 1, characterized in that, The dicarboxyl-terminated nylon described in S1 is prepared by reacting nylon hard segments with a dicarboxylic acid.

3. The method according to claim 2, characterized in that, The number-average molecular weight of the dicarboxylated nylon in S1 is 500-5000. The nylon hard segment mentioned in S1 is nylon prepared from C4-C24 raw materials; The dicarboxylic acid mentioned in S1 is a C4-C20 acid.

4. The method according to claim 3, characterized in that, The nylon hard segment mentioned in S1 is one or more of nylon 6, nylon 66, nylon 56, nylon 610, nylon 510, nylon 612, nylon 614, nylon 512, nylon 1010, nylon 1012, nylon 1212, nylon 11, and nylon 12; The dicarboxylic acid mentioned in S1 is one or more of adipic acid, sebacic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and tetradecanoic acid.

5. The method according to claim 1, characterized in that, The polyether polyol described in S2 is a polyether polyol with repeating units C2-C8; And / or, the monoacid end-capping agent in S2 is CxH2xO2 monocarboxylic acid, where x takes the value of an integer from 1 to 16; And / or, the S2 esterification reaction is carried out under a vacuum absolute pressure ≤500 PaA for 2-10 h; And / or, a catalyst is added in S2.

6. The method according to claim 5, characterized in that, The polyether polyol mentioned in S2 is one or more of polyethylene glycol, polypropylene glycol, and polybutanediol; And / or, in the single-acid capping agent described in S2, x takes the value of an integer from 2 to 6; And / or, the catalyst in S2 is a metal alkoxide M(OR)n, where M is a transition metal element, R is a C1-C10 alkyl group, and n is an integer from 1 to 4; The catalyst added in S2 is 0.01wt%-0.3wt% of the total amount of carboxyl-terminated nylon hard segments, polyether polyols, and monoacid end-capping agents.

7. The method according to claim 6, characterized in that, In S2, the catalyst M is one or more of Sb, Ti, Zr, and Ge, and n is an integer from 2 to 4.

8. The method according to claim 1, characterized in that, The epoxidized vegetable oil mentioned in S3 is an oil-based epoxidized compound; And / or, the reaction conditions for S3 are 160-260℃ and the reaction time is 1-6h; And / or, a catalyst is added in S3.

9. The method according to claim 8, characterized in that, The epoxidized vegetable oil mentioned in S3 is one or more of epoxidized soybean oil, epoxidized castor oil, and epoxidized corn oil; The catalyst in S3 is a nitrogen-containing heterocyclic compound; The catalyst added in S3 is 0.01wt%-0.1wt% of the total amount of monocarboxyl-terminated nylon elastomer and epoxidized vegetable oil.

10. The method according to claim 9, characterized in that, The catalyst in S3 is an imidazole catalyst.

11. A hydrophobic nylon elastomer, said elastomer being prepared by the method according to any one of claims 1-10, characterized in that, The hydrophobic nylon elastomer is a multi-arm type nylon elastomer epoxy vegetable oil copolymer.

12. Use of a hydrophobic nylon elastomer, said elastomer being prepared by any one of claims 1-10, or being the elastomer of claim 11, said elastomer being used in waterproof shoes, food packaging, cable sheaths, and sporting goods.

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