CN110759869B - Chain-limited dicarboxylic acid end-capping agent, preparation method and application thereof in nylon elastomer - Google Patents
Chain-limited dicarboxylic acid end-capping agent, preparation method and application thereof in nylon elastomer Download PDFInfo
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Abstract
The invention provides a chain-limited dicarboxyl end-capping agent, a preparation method and application thereof in nylon elastomers. The structural expression of the chain-limited dicarboxylic acid end-capping agent is as follows:
wherein X represents an alkyl group or a cycloalkyl group or an aralkyl group between NCO groups at both ends of a diisocyanate. The preparation method of the end-capping reagent comprises the following steps: reacting 2-amino-4-hydroxy-6-methylpyrimidine with diisocyanate in an inert gas atmosphere to obtain a product a; reacting the product a with 3, 5-bis (methoxycarbonyl) benzoic acid activated by thionyl chloride in an inert gas atmosphere to obtain a product b; and (3) reacting the product b with sodium hydroxide in the presence of a solvent to prepare the chain-limited dicarboxylic acid. The nylon elastomer prepared by the invention contains the ureido pyrimidone structure, which can form quadruple hydrogen bonds, and the nylon elastomer forms corresponding dimers due to the acting force of the hydrogen bonds, so that corresponding application is developed on self-repairing materials.
Description
Technical Field
The invention relates to a terminating agent, in particular to a chain-limited dicarboxylic acid terminating agent, a preparation method and application thereof in nylon elastomers, belonging to the technical field of nylon materials.
Background
The nylon elastomer is an embedded copolymer formed by copolymerizing a polyamide hard segment and a polyether polyol soft segment, and compared with other thermoplastic elastomers, the nylon elastomer has the advantages of good low-temperature performance, good chemical resistance, light weight and the like, so that the nylon elastomer is widely applied to medical catheters and sports equipment.
The repair methods of nylon elastomers can be divided into two categories: the first is external repair, which is carried out by adding a repairing agent and the like to the damaged part, and the external repair has no reversibility and can be carried out only once; the second type is internal self-repairing, namely, the self-repairing unit is added on the molecular structure to realize the self-repairing of the material by designing the molecular structure of the material. Common self-healing principles include DA reaction, hydrogen bonding, dynamic covalent bonding, and the like. The self-repairing mode has reversibility and can be repeated for many times, thereby greatly improving the service efficiency and prolonging the service life of the material.
The self-repairing mode is realized by changing the structure, wherein the hydrogen bond has simple structure, dynamic reversibility and better directionality and attraction, and is often used as a physical crosslinking point between polymers to prepare the self-repairing functional material.
The ureido pyrimidinone can form a quadruple hydrogen bond, and can form a corresponding dimer due to the acting force of the hydrogen bond. Meanwhile, the molecule has better temperature dependence, and can generate rapid breakage and formation of hydrogen bonds under thermal stimulation, and the characteristic facilitates the corresponding application of the molecule in the aspect of self-repair. Patent publications CN108929450A and CN108715667A disclose technical solutions for modifying polyacrylic acid and epoxy resin with ureido pyrimidinone to make the material have self-repairing function, but no report about capping agent with ureido pyrimidinone modified structure and self-repairing function of nylon elastomer by the capping agent has been found yet.
Disclosure of Invention
The invention aims to provide a chain-limited dicarboxylic acid end-capping agent, a preparation method and application of the chain-limited dicarboxylic acid end-capping agent in a nylon elastomer.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a chain-limited dicarboxylic acid end-capping agent has the following structural expression:
wherein X represents an alkyl group or a cycloalkyl group or an aralkyl group between NCO groups at both ends of a diisocyanate; preferably, X represents
Further preferably, X represents
A preparation method of a chain-limited dicarboxylic acid end-capping agent comprises the following steps:
1) reacting 2-amino-4-hydroxy-6-methylpyrimidine with diisocyanate in an inert gas atmosphere to obtain a product a;
2) reacting the product a with 3, 5-bis (methoxycarbonyl) benzoic acid activated by thionyl chloride in an inert gas atmosphere to obtain a product b;
3) and (3) reacting the product b with sodium hydroxide in the presence of a solvent to prepare the chain-limited dicarboxylic acid.
The reaction equation involved in the above preparation method is shown as follows:
further, the molar ratio of the 2-amino-4-hydroxy-6-methylpyrimidine to the diisocyanate in the step 1) is 3-7: 1;
preferably, the diisocyanate is one or more of hexamethylene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane-4, 4' -diisocyanate, isophorone diisocyanate, 1,5 naphthalene diisocyanate and toluene diisocyanate;
preferably, the reaction product obtained in the step 1) is washed by petroleum ether, filtered and dried to obtain a product a;
preferably, the reaction temperature in the step 1) is 80-100 ℃, and the reaction time is 12-20 h;
preferably, the inert gas in step 1) is one or more of nitrogen, argon, helium, neon, krypton, xenon and radon.
Further, the molar ratio of the product a, thionyl chloride and 3, 5-bis (methoxycarbonyl) benzoic acid in the step 2) is 1-1.5: 1-2: 1;
preferably, the reaction solvent of step 2) is N-methylpyrrolidone (NMP);
preferably, the reaction temperature in the step 2) is 0-30 ℃, and the reaction time is 0.5-5 h;
preferably, after the reaction in the step 2) is finished, pouring the reaction solution into water for precipitation and filtration to obtain a crude product; preferably, the crude product is washed by dilute hydrochloric acid, saturated sodium bicarbonate and deionized water in sequence and then dried to obtain a product b;
preferably, the inert gas in step 2) is one or more of nitrogen, argon, helium, neon, krypton, xenon and radon, and further preferably nitrogen.
Further, the molar ratio of the product b to the sodium hydroxide in the step 3) is 1: 1-2;
preferably, the solvent is a mixture of tetrahydrofuran and water, and more preferably the volume ratio is 1:1 of tetrahydrofuran and water;
preferably, after the reaction in the step 3) is finished, adjusting the reaction system to be neutral by using dilute hydrochloric acid, and then carrying out reduced pressure distillation to obtain a crude product; and dissolving the crude product in water, adjusting the pH value to 1-3, filtering and drying to obtain the chain-limited dicarboxylic acid.
A method of preparing a nylon elastomer comprising: the polyamide precursor, the chain-limited dicarboxylic acid end-capping agent prepared by the method and the polyether polyol end-capping having two hydroxyl ends are copolymerized in the presence of an assistant. The copolymerization reaction is carried out in a reaction kettle at the temperature of 200-320 ℃, the reaction condition is oxygen-free, and the reaction time is 5-20 hours, which are the conventional copolymerization reaction conditions in the preparation of nylon.
Further, the polyamide precursor is selected from PA6, PA11, PA12, PA66, PA610, PA612, PA1010, PA1012 blockings;
the polyether polyol block terminal is selected from polytetramethylene glycol, polypropylene glycol and polyethylene glycol block terminals; preferably, the number average molecular weight of the polyether polyol block end is 200-5000.
The auxiliary agent is one or more of phosphoric acid, sodium hypophosphite, tetrabutyl titanate, an antioxidant 168 and an antioxidant 1098. The addition amount of the auxiliary agent is 0.5-1% of the total mass of the reaction system, and is the conventional addition amount in the prior art.
Further, the molar ratio of the polyamide precursor to the polyether polyol embedded end is 5-30: 1, preferably 10-20: 1; the molar ratio of the polyamide precursor to the chain-limiting dicarboxylic acid end-capping agent is 1-30: 1, preferably 1-15: 1.
The nylon elastomer prepared by the method is characterized in that ureidopyrimidinone containing quadruple hydrogen bonds is grafted on the main chain of the nylon elastomer; the molar ratio of the main chain of the nylon elastomer to the ureido pyrimidone side chain is 2-60: 1.
The nylon elastomer prepared by the method is applied to nylon materials or composite materials with self-repairing functions.
The nylon elastomer prepared by the invention contains the ureido pyrimidone structure, which can form quadruple hydrogen bonds, and the nylon elastomer forms corresponding dimers due to the acting force of the hydrogen bonds, so that corresponding application is developed on self-repairing materials. The mechanism of action between hydrogen bonds is schematically shown below:
pre-repair polymer structures
Post repair polymer structures
Compared with the prior art, the invention has the following advantages:
1) the novel chain-limited dicarboxylic acid is prepared, and the side chain brought by the novel chain-limited dicarboxylic acid can enhance the interaction force among elastomer molecules and improve the elastic recovery performance of the material;
2) the quadruple hydrogen bonds on the side chains are more active, the recombination of the hydrogen bonds can be realized under the illumination and heating, and the self-repairing effect of the material can be realized by utilizing the performance;
3) compared with the prior art, the nylon elastomer material prepared by the technology has better tolerance and can greatly improve the service cycle of the material.
Drawings
FIG. 1 is an infrared analysis spectrum of a chain-limited dicarboxylic acid prepared in example 1;
FIG. 2 is an infrared analysis spectrum of a chain-limited dicarboxylic acid prepared in example 4;
FIG. 3 is an IR spectrum of a limited chain dicarboxylic acid prepared in example 7;
FIG. 4 is a light mirror image of the nylon elastomer prepared in example 1 before and after self-healing.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative of the invention and are not to be construed as limiting the scope of the invention.
The raw materials used in the examples of the present invention may be commercially available, unless otherwise specified.
Testing and analyzing method of grafting ratio: the composition of each element in the nylon elastomer was analyzed by XPS, and the graft ratio was determined by calculation. And (3) testing conditions are as follows: excitation source MgK alpha (1253.6eV), power 450W and vacuum degree 10-8～ 10-9And (5) Torr. The graft ratio is calculated as follows:
n＝(b*D-d)/(a-b*A)，
wherein n is the number of chain-limited dicarboxylic acids in 1mol of the nylon elastomer; a is the number of N elements in 1mol of limited chain dicarboxylic acid; a is the number of elements of 1mol of limited chain dicarboxylic acid; b is the quantity percentage of N element measured by XPS; d is the N element number of the soft and hard sections in 1mol of the nylon elastomer; d is the element number of soft and hard segments in 1mol of the nylon elastomer.
The infrared spectrum testing method comprises the following steps: a small amount of chain-limited dicarboxylic acid and excess potassium bromide powder were taken and put into a mortar, mixed and ground until homogeneous. And (3) putting the mixed powder into a tabletting mold, tabletting by using a tabletting machine, and putting the prepared slice into a vacuum oven to be dried for 8 hours. And (4) performing infrared spectrum characterization on the dried sample, analyzing the characteristic functional groups, and judging whether a target product is obtained.
[ example 1 ]
Preparation of a chain-limited diacid:
1) preparation of product a: 3mol of 2-amino-4-hydroxy-6-methylpyrimidine and 1mol of hexamethylene diisocyanate are added into a three-neck flask, and stirred and reacted for 20 hours at 80 ℃ under the nitrogen atmosphere. After the reaction, the reaction product was precipitated and filtered with petroleum ether, and the procedure was repeated 3 times. Putting the obtained product in a vacuum oven at 60 ℃ for drying to obtain a product a;
2) preparation of product b: 1mol of 3, 5-bis (methoxycarbonyl) benzoic acid was dissolved in 200ml of NMP, 1mol of thionyl chloride was added to the reaction system under a nitrogen atmosphere, and 1mol of product a was added to the system and reacted at 0 ℃ for 0.5 h. After the reaction is finished, pouring the product into water for precipitation, sequentially washing the precipitate with dilute hydrochloric acid, saturated sodium bicarbonate and deionized water, and drying in a vacuum oven at 60 ℃ to obtain a product b;
3) preparation of a target product: 1mol of the product b was dissolved in 200ml of a mixed solution (volume ratio 1:1) of tetrahydrofuran and water, and then 2mol of sodium hydroxide was slowly added to the system. After the addition was completed, the reaction system was reacted at room temperature for 15 hours, the reaction system was adjusted to pH 7 with dilute hydrochloric acid, and the solvent of the system was removed by distillation under reduced pressure to obtain a crude product of the objective product. And (3) dissolving the crude product in water, adjusting the pH value to 3 by using dilute hydrochloric acid to obtain a precipitated product, filtering, and drying in an oven at 60 ℃ to obtain the target chain-limited dicarboxylic acid.
The infrared spectrogram analysis is carried out on the target product prepared by the method, and the result is shown in figure 1.
Preparation of nylon elastomer: 30mol of polyamide precursor PA12, 1mol of polytetramethylene glycol (molecular weight 2000), 1mol of chain-limited dicarboxylic acid prepared by the method and antioxidant 168 accounting for 0.5 percent of the total mass are placed in a reaction kettle at 250 ℃ to react for 10 hours under anhydrous and anaerobic conditions, and the product is introduced into water to be cut into particles to obtain the required nylon elastomer with the self-repairing function.
[ example 2 ]
Chain-limited dicarboxylic acids and nylon elastomers were prepared according to the raw materials and methods of example 1, except that the amounts of the raw materials were different and the amounts of the raw materials were as shown in Table 1.
[ example 3 ]
Chain-limited dicarboxylic acids and nylon elastomers were prepared according to the raw materials and methods of example 1, except that the amounts of the raw materials were different and the amounts of the raw materials were as shown in Table 1.
[ example 4 ]
Preparation of a chain-limited diacid:
1) preparation of product a: 4.5mol of 2-amino-4-hydroxy-6-methylpyrimidine and 1.3mol of diphenylmethane diisocyanate are added into a three-neck flask, and stirred and reacted for 16h at 90 ℃ under the nitrogen atmosphere. After the reaction, the reaction product was precipitated and filtered with petroleum ether, and the procedure was repeated 3 times. Putting the obtained product in a vacuum oven at 60 ℃ for drying to obtain a product a;
2) preparation of product b: 1mol of 3, 5-bis (methoxycarbonyl) benzoic acid was dissolved in 200ml of NMP, 1.5mol of thionyl chloride was added to the reaction system under a nitrogen atmosphere, and 1.2mol of product a was added to the system and reacted at 10 ℃ for 2 hours. After the reaction is finished, pouring the product into water for precipitation, sequentially washing the precipitate with dilute hydrochloric acid, saturated sodium bicarbonate and deionized water, and drying in a vacuum oven at 60 ℃ to obtain a product b;
3) preparation of a target product: 1mol of the product b was dissolved in 200ml of a mixed solution (volume ratio 1:1) of tetrahydrofuran and water, and then 1.5mol of sodium hydroxide was slowly added to the system. After the addition was completed, the reaction system was reacted at room temperature for 20 hours, the reaction system was adjusted to pH 7 with dilute hydrochloric acid, and the solvent of the system was removed by distillation under reduced pressure to obtain a crude product of the objective product. And (3) dissolving the crude product in water, adjusting the pH value to 2 by using dilute hydrochloric acid to obtain a precipitated product, filtering, and drying in an oven at 60 ℃ to obtain the target chain-limited dicarboxylic acid.
The infrared spectrogram analysis is carried out on the target product prepared by the method, and the result is shown in figure 2.
Preparation of nylon elastomer: 10mol of polyamide precursor PA6, 1mol of polyethylene glycol (with the molecular weight of 5000), 1mol of chain-limited dicarboxylic acid prepared by the method and 1mol of sodium hypophosphite accounting for 1 percent of the total mass are placed in a reaction kettle at 320 ℃ to react for 5 hours under anhydrous and oxygen-free conditions, and the product is introduced into water to be cut into particles to obtain the required nylon elastomer with the self-repairing function.
[ example 5 ]
Chain-limited dicarboxylic acids and nylon elastomers were prepared according to the raw materials and methods of example 2, except that the amounts of the raw materials were different and the amounts of the raw materials were as shown in Table 1.
[ example 6 ]
Chain-limited dicarboxylic acids and nylon elastomers were prepared according to the raw materials and methods of example 2, except that the amounts of the raw materials were different and the amounts of the raw materials were as shown in Table 1.
[ example 7 ]
Preparation of a chain-limited diacid:
1) preparation of product a: 4mol of 2-amino-4-hydroxy-6-methylpyrimidine and 1mol of dicyclohexylmethane-4, 4' -diisocyanate are added into a three-neck flask, and stirred and reacted for 12h at 100 ℃ under the atmosphere of nitrogen. After the reaction, the reaction product was precipitated and filtered with petroleum ether, and the procedure was repeated 3 times. Putting the obtained product in a vacuum oven at 60 ℃ for drying to obtain a product a;
2) preparation of product b: 1mol of 3, 5-bis (methoxycarbonyl) benzoic acid was dissolved in 200ml of NMP, 2mol of thionyl chloride was added to the reaction system under a nitrogen atmosphere, and 1.5mol of product a was added to the system and reacted at 30 ℃ for 5 hours. After the reaction is finished, pouring the product into water for precipitation, sequentially washing the precipitate with dilute hydrochloric acid, saturated sodium bicarbonate and deionized water, and drying in a vacuum oven at 60 ℃ to obtain a product b;
3) preparation of a target product: 1mol of the product b was dissolved in 200ml of a mixed solution (volume ratio 1:1) of tetrahydrofuran and water, and then 1mol of sodium hydroxide was slowly added to the system. After the addition was completed, the reaction system was reacted at room temperature for 25 hours, the reaction system was adjusted to pH 7 with dilute hydrochloric acid, and the solvent of the system was removed by distillation under reduced pressure to obtain a crude product of the objective product. And (3) dissolving the crude product in water, adjusting the pH value to 1 by using dilute hydrochloric acid to obtain a precipitated product, filtering, and drying in an oven at 60 ℃ to obtain the target chain-limited dicarboxylic acid.
The infrared spectrogram analysis is carried out on the target product prepared by the method, and the result is shown in figure 3.
Preparation of nylon elastomer: 5mol of polyamide precursor PA612, 1mol of polypropylene glycol (molecular weight 200), 5mol of chain-limited dicarboxylic acid prepared by the method and antioxidant 1098 accounting for 0.8 percent of the total mass are placed in a reaction kettle at 200 ℃ to react for 20 hours under anhydrous and anaerobic conditions, and the product is introduced into water to be cut into particles so as to obtain the required nylon elastomer with the self-repairing function.
[ example 8 ]
Chain-limited dicarboxylic acids and nylon elastomers were prepared according to the raw materials and methods of example 3, except that the amounts of the raw materials were different and the amounts of the raw materials were as shown in Table 1.
[ example 9 ]
Chain-limited dicarboxylic acids and nylon elastomers were prepared according to the raw materials and methods of example 3, except that the amounts of the raw materials were different and the amounts of the raw materials were as shown in Table 1.
Table 1 raw material amounts in examples
A scratch having a length of 1cm and a thickness of 12 μm was cut on the surface of the nylon elastomer prepared in each example using a blade with a light intensity of 330mW/cm2Was irradiated with ultraviolet light to observe whether the scratch disappeared and the time required for complete repair was recorded, and the results are shown in table 2. In addition, for the macro-scaleThe scratch depth of the damaged nylon sample is measured, the concrete conditions of sample repair under different repair time are observed, the damaged film in the example 1 and the films under different repair time are placed on a light mirror for observation, the width of the damaged part is recorded, and photos under different repair conditions are taken, as shown in fig. 4.
Table 2 performance test results for nylon elastomers of the examples
The test result shows that the strength of hydrogen bonds in the system is enhanced along with the improvement of the grafting rate of the ureido pyrimidone, so that the self-repairing time of the self-made material is shortened. In actual use, the repairing effect in different time can be realized by adjusting different grafting rates according to actual use conditions and preparation cost, and the method has great flexibility and practical value.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (25)
1. A chain-limited dicarboxylic acid end-capping agent is characterized in that the structural expression of the end-capping agent is as follows:
wherein X represents
2. A method of preparing the chain-limited dicarboxylic acid capping agent of claim 1, comprising the steps of:
1) reacting 2-amino-4-hydroxy-6-methylpyrimidine with diisocyanate in an inert gas atmosphere to obtain a product a;
2) reacting the product a with 3, 5-bis (methoxycarbonyl) benzoic acid activated by thionyl chloride in an inert gas atmosphere to obtain a product b;
3) reacting the product b with sodium hydroxide in the presence of a solvent to prepare chain-limited dicarboxylic acid;
the diisocyanate is one or more of hexamethylene diisocyanate, diphenylmethane diisocyanate and dicyclohexylmethane-4, 4' -diisocyanate.
3. The method for preparing the chain-limited dicarboxylic acid blocking agent according to claim 2, wherein the molar ratio of the 2-amino-4-hydroxy-6-methylpyrimidine to the diisocyanate in the step 1) is 3-7: 1.
4. The method for preparing the chain-limiting dicarboxylic acid end-capping reagent according to claim 3, wherein the reaction product obtained in step 1) is washed with petroleum ether, filtered and dried to obtain a product a.
5. The method for preparing the chain-limiting dicarboxylic acid end-capping agent according to claim 3, wherein the reaction temperature in the step 1) is 80-100 ℃ and the reaction time is 12-20 h.
6. The method for preparing a chain-limiting dicarboxylic acid blocking agent according to claim 3, wherein the inert gas in step 1) is one or more of nitrogen, argon, helium, neon, krypton, xenon and radon.
7. The method for preparing the chain-limiting dicarboxylic acid blocking agent according to claim 6, wherein the inert gas in the step 1) is nitrogen.
8. The method for preparing a chain-limiting dicarboxylic acid blocking agent according to any one of claims 2 to 7, wherein the molar ratio of the product a, thionyl chloride and 3, 5-bis (methoxycarbonyl) benzoic acid in the step 2) is 1-1.5: 1-2: 1.
9. The method for preparing the chain-limiting dicarboxylic acid blocking agent according to claim 8, wherein the reaction solvent in step 2) is N-methylpyrrolidone.
10. The method for preparing the chain-limiting dicarboxylic acid end-capping agent according to claim 8, wherein the reaction temperature in step 2) is 0-30 ℃ and the reaction time is 0.5-5 h.
11. The method for preparing the chain-limiting dicarboxylic acid end-capping reagent according to claim 8, wherein the reaction solution is poured into water for precipitation and filtration after the reaction in step 2) is finished to obtain a crude product.
12. The method for preparing the chain-limiting dicarboxylic acid end-capping reagent according to claim 11, wherein the product b is obtained by washing the crude product with dilute hydrochloric acid, saturated sodium bicarbonate and deionized water in sequence and then drying.
13. The method of claim 8, wherein the inert gas in step 2) is one or more of nitrogen, argon, helium, neon, krypton, xenon, and radon.
14. The method for preparing the chain-limiting dicarboxylic acid blocking agent according to claim 13, wherein the inert gas in step 2) is nitrogen.
15. The method for preparing the chain-limiting dicarboxylic acid end-capping agent according to claim 8, wherein the molar ratio of the product b to the sodium hydroxide in the step 3) is 1: 1-2.
16. The method of claim 15, wherein the solvent is a mixture of tetrahydrofuran and water.
17. The method for preparing a chain-limiting dicarboxylic acid end-capping agent according to claim 16, wherein the solvent is a mixture of solvents in a volume ratio of 1:1 tetrahydrofuran and water.
18. The method for preparing the chain-limiting dicarboxylic acid end-capping reagent according to claim 15, wherein the reaction system is adjusted to be neutral by dilute hydrochloric acid after the reaction in step 3), and then the crude product is obtained by reduced pressure distillation; and dissolving the crude product in water, adjusting the pH value to 1-3, filtering and drying to obtain the chain-limited dicarboxylic acid.
19. A process for producing a nylon elastomer, characterized in that a polyamide precursor, the chain-limiting dicarboxylic acid blocking agent of claim 1, and a polyether polyol having two hydroxyl terminals are copolymerized in the presence of an assistant.
20. The method for preparing nylon elastomer according to claim 19, wherein the polyamide precursor is selected from PA6, PA11, PA12, PA66, PA610, PA612, PA1010, PA1012 block ends;
the polyether polyol block terminal is selected from polytetramethylene glycol, polypropylene glycol and polyethylene glycol block terminals;
the auxiliary agent is one or more of phosphoric acid, sodium hypophosphite, tetrabutyl titanate, an antioxidant 168 and an antioxidant 1098.
21. The method for producing a nylon elastomer according to claim 20, wherein the polyether polyol has a number average molecular weight of 200 to 5000 at the block ends.
22. The preparation method of the nylon elastomer with self-repairing property as claimed in any one of claims 19 to 21, wherein the molar ratio of the polyamide precursor to polyether polyol block end is 5-30: 1; the molar ratio of the polyamide precursor to the chain-limiting dicarboxylic acid end-capping agent is 1-30: 1.
23. The method for preparing a nylon elastomer according to claim 22, wherein the molar ratio of the polyamide precursor to polyether polyol block ends is 10-20: 1; the molar ratio of the polyamide precursor to the chain-limiting dicarboxylic acid end-capping agent is 1-15: 1.
24. A nylon elastomer prepared by the process of any of claims 19-23 wherein the nylon elastomer backbone has grafted thereto ureidopyrimidinone containing quadruple hydrogen bonding; the molar ratio of the nylon elastomer main chain to the ureido pyrimidone side chain is 2-60: 1.
25. A nylon elastomer prepared by the method of any one of claims 19 to 23, applied to a nylon material or composite material having a self-healing function.
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