CN115093562A - Polyamide elastomer, preparation method thereof and plastic product - Google Patents

Abstract

The invention discloses a polyamide elastomer, a preparation method thereof and a plastic product. The polyamide elastomer is prepared from the following raw materials: caprolactam, amine compounds, diacid compounds and water; wherein the amine compound is at least one selected from polyether amine and naphthenic diamine with 3-10 carbon atoms; the diacid compound is straight-chain alkane diacid with 3-10 carbon atoms; based on the total mass of the caprolactam, the amine compound and the diacid compound, the mass percent of the amine compound is 5-70%, the mass percent of the diacid compound is 1-25%, and the polyamide elastomer has excellent elasticity and wear resistance.

Description

Polyamide elastomer, preparation method thereof and plastic product

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyamide elastomer, a preparation method thereof and a plastic product.

Background

Thermoplastic elastomer (TPE) is a material with the characteristics of rubber and thermoplastic plastics, is a plastic-molded high polymer material which has rubber elasticity at normal temperature and can flow at high temperature, and a high polymer chain of the thermoplastic elastomer (TPE) consists of a plastic section (hard section) and a rubber section (elastic soft section). The plastic segment has reversibility, forms physical 'cross-linking points' at normal temperature, plays a role in restraining macromolecular components and reinforcing, loses restraining force at high temperature, is plastic, and is a high-elasticity chain segment with larger free rotation capacity. The TPE has the characteristics of ageing resistance, oil resistance, low temperature resistance, wear resistance, high elasticity and the like which are comparable to those of the traditional rubber elastomer, has the characteristics of quick processing, strong design flexibility and lower manufacturing cost, and can be widely applied to various fields of automobile parts, sports goods, medical supplies, household goods, mechanical tools, toys, electronics and the like.

The polyamide elastomer (TPAE) is a newly developed alternating block copolymer thermoplastic elastomer, has excellent performance, wherein the hard segment of the TPAE is generally polyamide with stronger crystallinity and higher melting point, and the soft segment of the TPAE is polyether or polyester. However, with the development of science and technology, the requirements for the mechanical properties of polyamide elastomers are higher and higher, and the mechanical properties, such as abrasion resistance and elasticity, of polyamide elastomers prepared by the traditional technology cannot meet the requirements for the development of science and technology.

Thus, the prior art remains to be improved.

Disclosure of Invention

Based on the above, the present invention provides a polyamide elastomer having both excellent elasticity and abrasion resistance, a method for producing the same, and a plastic article.

The technical scheme of the invention is as follows.

In one aspect of the present invention, there is provided a polyamide elastomer prepared from raw materials including: caprolactam, amine compounds, diacid compounds and water;

wherein the amine compound is selected from at least one of polyether amine and naphthenic diamine with 3-10 carbon atoms; the diacid compound is straight-chain alkane diacid with 3-10 carbon atoms;

based on the total mass of the caprolactam, the amine compound and the diacid compound, the mass percent of the amine compound is 5-70%, and the mass percent of the diacid compound is 1-25%.

In some of these embodiments, the mass percent of the amine compound is 30% to 60% based on the total mass of the caprolactam, the amine compound, and the diacid compound.

In some embodiments, the mass percent of the diacid compound is 1-20% based on the total mass of the caprolactam, the diacid compound, and the amine compound.

In some of these embodiments, the amine compound is selected from at least one of polyetheramine, 1, 2-cyclohexanediamine, 1, 3-cyclohexanediamine, 1, 4-cyclohexanediamine, and 1, 4-cyclohexanediamine.

In some of the embodiments, the polyether amine has a number average molecular weight of 400 to 6000.

In some of these embodiments, the polyetheramine is selected from at least one of polypropylene glycol ether amine and polyethylene glycol ether amine.

In some of these embodiments, the diacid compound is selected from at least one of malonic acid, succinic acid, adipic acid, and sebacic acid.

In another aspect of the present invention, there is provided a method for preparing the polyamide elastomer as described above, comprising the steps of:

and carrying out polymerization reaction on the caprolactam, the amine compound, the diacid compound and the water to obtain the polyamide elastomer.

In some of these embodiments, the step of polymerizing comprises the steps of:

firstly reacting for 0.5 to 4 hours at the temperature of between 200 and 280 ℃ and under the pressure of between 0 and 3.5MPa, and then reacting for 0.5 to 5 hours at the temperature of between 240 and 280 ℃ under the vacuum condition.

In a further aspect of the invention there is provided a plastic article, the material of which comprises a polyamide elastomer as described above.

The polyamide elastomer is prepared from raw materials comprising caprolactam, a specific amine compound, a specific diacid compound and water, wherein the caprolactam is subjected to hydrolytic ring opening under the action of the water, monomers subjected to ring opening of the caprolactam are subjected to self polymerization to obtain polyamide, and are subjected to reaction polymerization with the specific amine compound and the diacid compound, the polyamide elastomer with a specific structure is obtained by simultaneously controlling the mass ratio of the caprolactam, the amine compound and the diacid compound, and the polyamide elastomer has excellent elasticity and wear resistance through mutual matching and synergistic effect of specific components in a specific mass ratio.

In the preparation method of the polyamide elastomer, specific raw materials are adopted for polymerization reaction, the specific components in specific mass ratio are matched with each other and have synergistic effect, so that the polyamide elastomer with a specific structure is obtained, and the specific components in specific mass ratio are matched with each other and have synergistic effect, so that the polyamide elastomer has excellent elasticity and wear resistance, and the process flow is simple.

Further, the step of the above polymerization reaction comprises the steps of: the polyamide elastomer is firstly reacted for 0.5 to 4 hours at 200 to 280 ℃ and 0 to 1MPa, then reacted for 0.5 to 5 hours at 240 to 280 ℃ and minus 0.1MPa, and the polyamide elastomer with excellent elasticity and wear resistance can be obtained without adding a catalyst by controlling the specific polymerization reaction conditions.

The material of the plastic product comprises the polyamide elastomer, the polyamide elastomer has excellent elasticity and wear resistance, the plastic product is convenient to process and prepare, the prepared plastic product has high elasticity and good wear resistance, and the service life of the plastic product is prolonged.

Detailed Description

In order that the invention may be more fully understood, a more particular description of the invention will now be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The words "preferably," "more preferably," and the like, in the present disclosure mean embodiments of the disclosure that may, in some instances, provide certain benefits. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.

The term "cycloalkanediamine having 3 to 10 carbon atoms" refers to a compound formed by replacing any two hydrogens in a cycloalkane having 3 to 10 carbon atoms with an amine group, wherein examples of cycloalkanes having 3 to 10 carbon atoms include, but are not limited to, cyclopropane, cyclobutane, cyclopentane, cyclohexane, and the like, and thus examples of cycloalkane diamines having 3 to 10 carbon atoms include, but are not limited to: trimethylene diamine, tetramethylene diamine, pentamethylene diamine, hexamethylene diamine, etc.

The term "C3-10 linear alkane diacid" refers to a compound formed by substituting two hydrogen atoms in C1-8 linear alkanes with carboxylic acid groups, wherein examples of the C1-8 linear alkanes include but are not limited to: methane, ethane, n-propane, n-butane, n-pentane, n-hexane, n-heptane, n-octane, and the like, and thus examples of the linear alkane diacid having 3 to 10 carbon atoms formed include, but are not limited to: malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and the like.

One embodiment of the present invention provides a polyamide elastomer prepared from raw materials including: caprolactam, amine compounds, diacid compounds and water;

wherein the amine compound is at least one selected from polyether amine and naphthenic diamine with 3-10 carbon atoms; the diacid compound is straight-chain alkane diacid with 3-10 carbon atoms;

based on the total mass of caprolactam, amine compounds and diacid compounds, the mass percent of the amine compounds is 5-70%, and the mass percent of the diacid compounds is 1-25%.

The polyamide elastomer is prepared from raw materials comprising caprolactam, a specific amine compound, a specific diacid compound and water, wherein the caprolactam is subjected to hydrolytic ring opening under the action of the water, monomers subjected to ring opening of the caprolactam are subjected to self polymerization or addition polymerization to obtain polyamide, and are subjected to reaction polymerization with the specific amine compound and the diacid compound, the polyamide elastomer with a specific structure is obtained by simultaneously controlling the mass ratio of the caprolactam, the amine compound and the diacid compound, and the specific components in the specific mass ratio are matched with each other to realize synergistic effect, so that the polyamide elastomer has excellent elasticity and wear resistance.

The above-mentioned reaction processes are analyzed theoretically here: the method comprises the following steps of firstly obtaining aminoacetic acid by carrying out hydrolytic ring opening on caprolactam under the action of water, carrying out self-polycondensation on the aminoacetic acid to form a polyamide chain, adding the polyamide chain with lactam to further form a polyamide chain with high polymerization degree, simultaneously exchanging the polyamide chains to obtain a final polyamide chain segment, and reacting amino or carboxyl on the aminoacetic acid or the polyamide chain with an amine compound and a diacid compound for polymerization to form a block chain, thereby forming the polyamide elastomer with a specific structure. It should be noted that there is a complex polymerization mechanism in the reaction process, and only the theoretical analysis is attempted here, but not limited to the above theoretical explanation.

It should be noted that when a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range as well as each value between such minimum and maximum values. For example, "5% to 70%" includes but is not limited to: 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 35%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 60%, 65%, 70%; "1% to 25%" includes, but is not limited to: 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%.

In some embodiments, the mass percent of the amine compound is 30% to 60% based on the total mass of the caprolactam, the amine compound, and the diacid compound.

In some embodiments, the diacid compound is present in an amount of 1 to 20 percent by weight, based on the total weight of caprolactam, the amine compound, and the diacid compound.

The mass ratio of the amine compound to the diacid compound is further regulated and controlled, so that the mechanical property of the polyamide elastomer is further improved.

In some embodiments, the mass percent of the amine compound is 25% to 55% based on the total mass of the caprolactam, the amine compound, and the diacid compound.

In some embodiments, the amine compound is selected from any one of polyether amine and cycloalkane diamine with 3-10 carbon atoms.

In some embodiments, the amine compound is a mixture of polyether amine and cycloalkane diamine with 3-10 carbon atoms.

Examples of cycloalkanediamine having 3 to 10 carbon atoms include, but are not limited to: cyclopropyldiamine, cyclobutanediamine, cyclopentenediamine, cyclohexanediamine, and the like.

In some embodiments, the cycloalkane diamine with 3-10 carbon atoms is cyclohexanediamine, including 1, 2-cyclohexanediamine and 1, 4-cyclohexanediamine.

Examples of the linear alkane diacid having 3 to 10 carbon atoms include, but are not limited to: at least one of malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid and sebacic acid.

In a specific example, the above-mentioned diacid compound is selected from at least one of malonic acid, succinic acid, adipic acid and sebacic acid.

In some embodiments, the polyether amine has a number average molecular weight of 400 to 6000.

The molecular weight of the benzene polyether amine is controlled, so that the proportion and the distribution of a hard segment and a soft segment of the polyamide elastomer are controlled and regulated, and the mechanical property of the polyamide elastomer is further improved.

In some of these embodiments, the polyether amine is selected from at least one of polypropylene glycol ether amine and polyethylene glycol ether amine.

Further, the mass percent of the water is 2-10% based on the total mass of the caprolactam, the amine compound and the diacid compound.

An embodiment of the present invention also provides a method for preparing the polyamide elastomer, including the following step S10.

Step S10 of polymerizing the caprolactam, the amine compound, the diacid compound, and the water to obtain the polyamide elastomer.

In some of these embodiments, in step S10, the step of polymerizing includes the steps of:

firstly reacting for 0.5 to 4 hours at the temperature of between 200 and 280 ℃ and under the pressure of between 0 and 1MPa, and then reacting for 0.5 to 5 hours at the temperature of between 240 and 280 ℃ under the vacuum condition.

By controlling the temperature and pressure conditions of the polymerization reaction, the polymerization reaction is promoted toward the formation of the polyamide.

Specifically, the reaction is carried out for 0.5 to 4 hours at 200 to 280 ℃ and 0 to 1MPa, then the reaction is carried out for 0.5 to 5 hours at 240 to 280 ℃ and the vacuum pumping is carried out to-0.1 MPa, and the reaction is carried out for 0.5 to 5 hours while the vacuum pumping is continuously carried out to keep-0.1 MPa. Under the conditions of the temperature and the vacuum, water generated in the polymerization reaction process is pumped out, so that the polymerization reaction can be promoted to the direction of forming the polyamide, and the polyamide elastomer with excellent elasticity and wear resistance can be obtained without adding a catalyst.

In some of these embodiments, the polymerization reaction is performed in a protective gas atmosphere in step S10.

Further, the protective gas includes at least one of nitrogen and an inert gas.

In particular, the inert gas is selected from: at least one of helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe).

Specifically, in step S10, the polymerization reaction is performed in a nitrogen atmosphere.

In some embodiments, the polymerization reaction is carried out under stirring, and further, the stirring speed is 50rpm to 300 rpm.

In some embodiments, step S10 further includes the following step S11 after the polymerization reaction.

And step S11, extracting the polymerization reaction product by boiling water, drying and cutting into granules.

An embodiment of the invention also provides a plastic article, the material of which comprises a polyamide elastomer as described above.

The polyamide elastomer is prepared from raw materials comprising caprolactam, a specific amine compound, a specific diacid compound and water, wherein the caprolactam is subjected to hydrolytic ring opening under the action of the water, monomers subjected to ring opening of the caprolactam are subjected to self polymerization or addition polymerization to obtain polyamide, and are subjected to reaction polymerization with the specific amine compound and the diacid compound, the polyamide elastomer with a specific structure is obtained by simultaneously controlling the mass ratio of the caprolactam, the amine compound and the diacid compound, and the specific components in the specific mass ratio are matched with each other to realize synergistic effect, so that the polyamide elastomer has excellent elasticity and wear resistance. When the polyamide elastomer is used for preparing a plastic product, the polyamide elastomer is convenient to process and prepare the plastic product, the prepared plastic product has high elasticity and good wear resistance, and the service life of the plastic product is prolonged.

Such plastic articles include, but are not limited to: various sports equipment, medical appliances, automotive interiors, daily necessities and the like, such as gaskets, cables, electronic packaging films, buffer parts, toys and the like.

While the present invention will be described in connection with particular embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover by the appended claims the scope of the invention, and that certain changes and modifications of the various embodiments of the invention, which fall within the true spirit and scope of the invention, will be suggested to those skilled in the art and this disclosure.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Example 1

(1) Adding 600g of polypropylene glycol ether amine with the number average molecular weight of 400, 2200g of caprolactam, 65 g of deionized water and 177g of succinic acid into a reactor, heating to 240 ℃ under the protection of nitrogen, controlling the pressure to be 0.5MPa, and reacting for 2 hours at the mechanical stirring speed of 80 rpm; then continuously vacuumizing at 240 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 3 hours at the mechanical stirring speed of 100rpm, then discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Example 2

(1) 1050g of polypropylene glycol ether amine with the number average molecular weight of 2000, 1880g of caprolactam, 56g of deionized water and 55g of malonic acid are added into a reactor, the temperature is raised to 260 ℃ under the protection of nitrogen, the pressure is controlled to be 0.7MPa, and the reaction is carried out for 1.5 hours at the mechanical stirring speed of 100 rpm; then continuously vacuumizing at 240 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 200rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Example 3

(1) Adding 270g of cyclohexanediamine, 2400g of caprolactam, 80g of deionized water and 336g of adipic acid into a reactor, heating to 250 ℃ under the protection of nitrogen, controlling the pressure to be 0.6MPa, and reacting for 1.5 hours at the mechanical stirring speed of 250 rpm; then continuously vacuumizing at 240 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 250rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Example 4

(1) Adding 1350g of polypropylene glycol ether amine with the number average molecular weight of 1000, 1470g of caprolactam, 44g of deionized water and 270g of sebacic acid into a reactor, heating to 240 ℃ under the protection of nitrogen, controlling the pressure at 0.5MPa, and reacting for 1.5 hours at the mechanical stirring speed of 200 rpm; then continuously vacuumizing at 250 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 150rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Example 5

(1) Adding 1500g of polyethylene glycol ether amine with the number average molecular weight of 1000, 1300g of caprolactam, 39g of deionized water and 303g of sebacic acid into a reactor, heating to 270 ℃ under the protection of nitrogen, controlling the pressure to be 1MPa, and reacting for 1.5 hours at the mechanical stirring speed of 150 rpm; then continuously vacuumizing at 240 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 100rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Example 6

(1) Adding 1800g of polyglycol ether amine with the number average molecular weight of 2000, 90g of 1, 4-cyclohexanediamine, 863g of caprolactam, 30g of deionized water and 247g of adipic acid into a reactor, heating to 250 ℃ under the protection of nitrogen, controlling the pressure to be 0.6MPa, and reacting for 1.5 hours at the mechanical stirring speed of 100 rpm; then continuously vacuumizing at 260 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 200rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Example 7

(1) 1200g of polypropylene glycol ether amine with the number average molecular weight of 2000, 150g of 1, 2-cyclohexanediamine, 1263g of caprolactam, 52g of deionized water and 387g of sebacic acid are added into a reactor, the temperature is raised to 260 ℃ under the protection of nitrogen, the pressure is controlled to be 0.7MPa, and the reaction is carried out for 1.5 hours at the mechanical stirring speed of 200 rpm; then continuously vacuumizing at 260 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 200rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Example 8

(1) Adding 600g of polypropylene glycol ether amine with the number average molecular weight of 2000, 150g of 1, 2-cyclohexanediamine, 1924g of caprolactam, 57.7g of deionized water and 326.4g of sebacic acid into a reactor, heating to 260 ℃ under the protection of nitrogen, controlling the pressure to be 0.7MPa, and reacting for 1.5 hours at the mechanical stirring speed of 200 rpm; and continuously vacuumizing at 260 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at a mechanical stirring speed of 200rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Comparative example 1

(1) 364.5g of 4,4' -diaminodicyclohexylmethane, 2400g of caprolactam, 80g of deionized water and 246g of adipic acid are added into a reactor, and the mixture is heated to 250 ℃ under the protection of nitrogen, the pressure is controlled to be 0.6MPa, and the reaction is carried out for 1.5 hours at a mechanical stirring speed of 250 rpm; then continuously vacuumizing at 240 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 250rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Comparative example 2

2400g of polypropylene glycol ether amine with the number average molecular weight of 2000, 430g of caprolactam, 56g of deionized water and 125g of malonic acid are added into a reactor, the temperature is raised to 260 ℃ under the protection of nitrogen, the pressure is controlled to be 0.7MPa, and the reaction is carried out for 1.5 hours at the mechanical stirring speed of 100 rpm; then continuously vacuumizing at 240 ℃ to keep the vacuum degree of the system at-0.1 MPa, continuously reacting for 2.5 hours at the mechanical stirring speed of 200rpm, discharging, extracting by boiling water, and finally drying to obtain the polyamide elastomer.

Performance testing

The polyamide elastomers prepared in examples 1 to 8 and comparative examples 1 to 2 were tested for melting point, tensile strength, elongation at break, notched impact strength, and shore hardness, and the specific test reference standard is shown in table 1.

TABLE 1

Physical Properties	Unit of	Test method
			Melting Point	℃	GB/T19466.3-2004
Tensile strength	MPa	GB/T 1040.1
			Elongation at break	％	GB/T 1040.1
Notched impact strength	KJ.m -2	GB 1843
			Shore hardness	D	GB/T2411-1980

The test results of examples 1 to 8 and comparative examples 1 to 2 are shown in Table 2.

TABLE 2

Wherein, NB: not broken (no break).

The data in Table 2 above are analyzed to show that: the addition of the alicyclic amines can reduce the crystallinity, thereby greatly reducing the melting point, adjusting the melting point and improving the transparency. The addition of the polyether amine or the alicyclic amine can reduce the crystallinity of the nylon to different degrees, thereby reducing the mechanical property, increasing the elongation at break and improving the elasticity.

As can be seen from the test results in Table 2: the polyamide elastomer disclosed by the invention is excellent in mechanical property, and has good elasticity and wear resistance.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (10)

1. A polyamide elastomer is characterized in that the polyamide elastomer is prepared from the following raw materials: caprolactam, amine compounds, diacid compounds and water;

wherein the amine compound is at least one selected from polyether amine and naphthenic diamine with 3-10 carbon atoms; the diacid compound is straight-chain alkane diacid with 3-10 carbon atoms;

based on the total mass of the caprolactam, the amine compound and the diacid compound, the mass percent of the amine compound is 5-70%, and the mass percent of the diacid compound is 1-25%.

2. The polyamide elastomer according to claim 1, wherein the amine compound is contained in an amount of 30 to 60% by mass based on the total mass of the caprolactam, the amine compound and the diacid compound.

3. The polyamide elastomer according to claim 1, wherein the diacid compound is present in an amount of 1 to 20 percent by mass, based on the total mass of the caprolactam, the amine compound, and the diacid compound.

4. The polyamide elastomer according to any one of claims 1 to 3, wherein the amine compound is at least one selected from the group consisting of polyetheramine, 1, 2-cyclohexanediamine, 1, 3-cyclohexanediamine, 1, 4-cyclohexanediamine, and 1, 4-cyclohexanediamine.

5. The polyamide elastomer according to any one of claims 1 to 3, wherein the polyether amine has a number average molecular weight of 400 to 6000.

6. The polyamide elastomer as claimed in any one of claims 1 to 3, wherein the polyether amine is at least one selected from the group consisting of polypropylene glycol ether amine and polyethylene glycol ether amine.

7. The polyamide elastomer as claimed in any one of claims 1 to 3, wherein the diacid compound is at least one member selected from the group consisting of malonic acid, succinic acid, adipic acid and sebacic acid.

8. The method for producing a polyamide elastomer according to any one of claims 1 to 7, comprising the steps of:

and carrying out polymerization reaction on the caprolactam, the amine compound, the diacid compound and the water to obtain the polyamide elastomer.

9. The method for producing a polyamide elastomer according to claim 8, wherein the step of polymerizing comprises the steps of:

firstly reacting for 0.5 to 4 hours at the temperature of between 200 and 280 ℃ and under the pressure of between 0 and 3.5MPa, and then reacting for 0.5 to 5 hours at the temperature of between 240 and 280 ℃ under the vacuum condition.

10. A plastic article characterized in that the material of the plastic article comprises the polyamide elastomer according to any one of claims 1 to 8.