Wear-resistant and tear-resistant polyamide elastomer composition and preparation method and application thereof

Abstract

The present invention discloses a wear-resistant and tear-resistant polyamide elastomer composition and a preparation method and application thereof, and belongs to the technical field of modified materials. The wear-resistant and tear-resistant polyamide elastomer composition is prepared by weight from 87.1 to 95.9 parts of polyamide elastomer, 3 to 10 parts of wear-resistant agent, 0.2 to 1 part of cross-linking agent, 0.4 to 1 part of antioxidant, 0.1 to 0.6 parts of nucleating agent, 0.2 to 0.6 parts of dispersant, 0 to 2 parts of masterbatch, and 0 to 0.01 parts of fluorescent brightener. The present invention adopts polyamide elastomer as a substrate, and generates a cross-linking structure through a trifunctional cross-linking agent and an amide bond and / or an end group (amino, carboxyl, hydroxyl) in a polyamide elastomer molecular chain to improve the tear strength of the composition, and adds a polymer wear-resistant agent (PTFE and / or POM powder) to improve the wear resistance and resilience of the composition, so that the badminton racket line nails prepared by the composition of the present invention have playability and durability.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, in particular to a wear-resistant and tear-resistant polyamide elastomer composition and a preparation method and application thereof. Background Art

[0002] Badminton racket wire spikes are a device used to protect the badminton racket wires. They are usually installed on the top of the badminton net, covering part of the wires. The main function of the wire spikes is to prevent the wires from being damaged during the game. At the same time, they can also reduce the friction between the ball and the wires, and improve the fluency and viewing of the game. The wires of the racket head are the part that directly contacts the badminton. During use, the wires are prone to friction with the wire guard of the racket, causing the wires or wire spikes to break, seriously affecting the sports experience. Therefore, higher requirements are placed on the strength, toughness, and wear resistance of the material of the racket wire spikes.

[0003] Metal wire nails are more durable but heavier, while plastic wire nails are relatively lighter and have more applications. Polyamide has become the most commonly used wire nail base material due to its strong crystallinity, high mechanical strength, and good wear resistance. It is mainly divided into two grades: PA6 (i.e. polycaprolactam) and PA12 (i.e. polylaurolactam). PA6 has a high water absorption rate, with a saturated water absorption rate of more than 3%, which to a certain extent affects the dimensional stability of the wire nail (especially water absorption and thickening). After absorbing water, the tear resistance of the wire nail will also be significantly reduced, making it less durable. PA12 has a low water absorption rate and good dimensional stability, and the wire nails made are relatively more advanced, but there is still a problem of insufficient wear resistance and the need for regular replacement. How to combine and improve the wear resistance and tear resistance of the wire nail has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention provides a wear-resistant and tear-resistant polyamide elastomer composition and a preparation method and application thereof to solve the problems raised in the above-mentioned background technology. A polyamide elastomer is used as a substrate, and a cross-linking structure is generated by a trifunctional cross-linking agent and the amide bonds and / or end groups (amino, carboxyl, hydroxyl) in the polyamide elastomer molecular chain to improve the tear strength of the composition, and a high molecular wear-resistant agent is added to improve the wear resistance of the composition.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention discloses a wear-resistant and tear-resistant polyamide elastomer composition, which is prepared from the following components in parts by weight:

[0007] Polyamide elastomer 87.1~95.9 parts,

[0008] 3~10 parts of anti-wear agent,

[0009] Cross-linking agent 0.2~1 part,

[0010] Antioxidant 0.4~1 part,

[0011] Nucleating agent 0.1~0.6 parts,

[0012] Dispersant 0.2~0.6 parts,

[0013] Masterbatch 0~2 parts,

[0014] Fluorescent brightener 0~0.01 parts.

[0015] As a further solution of the present invention: the hard segment of the polyamide elastomer is polyamide, and the soft segment is polyether.

[0016] As a further solution of the present invention: the polyamide elastomer is prepared by polycondensation reaction of a polyamide prepolymer and a polyether amine in a mass ratio of (65-90): (10-35).

[0017] As a further solution of the present invention: the polyamide prepolymer is at least one of PA6 (polycaprolactam), PA510 (polypentamethylenediamine sebacic acid resin), PA610 (polyhexamethylenediamine sebacic acid), PA512 (polypentamethylenediamine dodecanoic acid), PA612 (polyhexamethylenediamine dodecanoic acid), and PA1012 (polydecanediamine dodecanoic anhydride).

[0018] As a further embodiment of the present invention: the polyetheramine is at least one of polyethylene glycol-based polyetheramine, polypropylene glycol-based polyetheramine and polytetrahydrofuran-based polyetheramine.

[0019] As a further solution of the present invention: the melt index of the polyamide elastomer at 235°C / 2.16kg is 10-40 g / 10min.

[0020] As a further solution of the present invention: the wear-resistant agent is one of polytetrafluoroethylene powder and polyoxymethylene powder.

[0021] As a further embodiment of the present invention: the cross-linking agent is at least one of 1,3,5-tris(4-hydroxyphenyl)benzene, 1,3,5-tris(4-carboxyphenyl)benzene and 1,3,5-tris(4-aminophenyl)benzene.

[0022] As a further solution of the present invention: the antioxidant is at least one of hindered phenol antioxidants, amine antioxidants, phosphite antioxidants, and thioester antioxidants.

[0023] As a further solution of the present invention: the dispersant is at least one of ethylene bisstearamide and pentaerythritol stearate.

[0024] As a further solution of the present invention: the masterbatch is at least one of a PA masterbatch and a PE masterbatch.

[0025] As a further embodiment of the present invention: the fluorescent whitening agent is at least one of 4,4'-di(benzoxazol-2-yl)trans-stilbene and 2,5-bis-(5-tert-butyl-2-benzoxazolyl)thiophene.

[0026] In a second aspect, the present invention discloses a method for preparing the wear-resistant and tear-resistant polyamide elastomer composition as described above, comprising the following steps:

[0027] S1: Weigh each component by weight, mix them evenly, and obtain a mixed material;

[0028] S2: adding the mixed material into the main feeding port of the twin-screw extruder, and after melting, extruding, pelletizing and drying, a wear-resistant and tear-resistant polyamide elastomer composition is obtained.

[0029] As a further solution of the present invention: the temperature of one zone of the twin-screw extruder is 150-180° C., the temperature of other zones and the die head is 190-230° C.; the screw speed is 100-400 r / min.

[0030] In a third aspect, the present invention discloses the use of the wear-resistant and tear-resistant polyamide elastomer composition as a badminton racket string spike.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] By introducing polyether segments into the polyamide molecular chain, the content of amide bonds in the molecular chain is reduced, thereby reducing the crystallization shrinkage and water absorption rate of the polyamide, and effectively improving the dimensional stability of the composition; and by adjusting the proportion of the polyether segments, the toughness and strength of the polyamide elastomer are coordinated and regulated to meet the personalized feel requirements of the racket. By adding a trifunctional crosslinking agent to form a three-dimensional network structure with the polyamide elastomer molecules, the tear strength of the composition is improved. By adding a self-lubricating, low-friction polymer wear-resistant agent (PTFE and / or POM powder), not only can the wear resistance of the composition be improved, but also it can act as a stress concentration point in the three-dimensional grid structure of the matrix, thereby improving the resilience of the composition, making the composition of the present invention more playable and durable.

[0033] The polyamide elastomer comprises carboxyl-terminated polyamide as a hard segment and polyetheramine as a soft segment, and the toughness and strength of the polyamide elastomer are synergistically regulated by adjusting the ratio of the polyether chain segments; the trifunctional crosslinking agent is a 1,3,5-tri(4-substituted phenyl)benzene derivative, which has high rigidity and improves the strength of the three-dimensional network structure. At the same time, the 1,3,5-tri(4-substituted phenyl)benzene derivative has significant photoluminescence characteristics, and the introduction of this unit into the target molecular skeleton can effectively change the luminescence properties of the composition; the wear-resistant agent is a self-lubricating polymer powder material (PTFE and / or POM powder) with a low friction coefficient, which not only has good wear resistance, but also has good compatibility with the polyamide elastomer matrix. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0037] Wear-resistant agent, PTFE wear-resistant powder (polytetrafluoroethylene powder GR-C528, D50: 2μm), produced by Shandong Dongyue Company; POM wear-resistant powder (Yuntianhua polyoxymethylene M90 ​​powder, mesh number: 200), produced by Liuhe Plastic Company;

[0038] Cross-linking agents, 1,3,5-tri(4-aminophenyl)benzene, 1,3,5-tri(4-carboxyphenyl)benzene, 1,3,5-tri(4-hydroxyphenyl)benzene, were provided by Shanghai MacLean Company;

[0039] Antioxidants: 1098 antioxidant and 168 antioxidant, manufactured by BASF;

[0040] Nucleating agent: BRUGGOLEN P22 nucleating agent, manufactured by Bruggemann, Germany; Licomont Cav102 nucleating agent, manufactured by Clariant;

[0041] Dispersant: EBS dispersant, provided by Dingxin Plastics, brand name Indonesia P130; PETS dispersant, provided by Shandong Xinfa Ruijie Company;

[0042] Fluorescent brighteners: Tinopal® OB-1 and Tinopal® OB brighteners, manufactured by BASF;

[0043] PA masterbatch and PE masterbatch are both common products available on the market.

[0044] It is to be understood that the above raw materials and reagents are only examples of some specific embodiments of the present invention, so that the technical solution of the present invention is clearer, and it does not mean that the present invention can only use the above reagents, and the specific scope in the claims shall prevail. In addition, the "parts" described in the examples and comparative examples, unless otherwise specified, refer to parts by weight.

[0045] Any range described in the present invention includes the end value and any numerical value between the end values ​​and any sub-range formed by the end value or any numerical value between the end values.

[0046] Example 1

[0047] (1) Weigh the following raw materials: 92.9 parts of polyamide elastomer, 5 parts of PTFE wear-resistant powder, 0.4 parts of 1,3,5-tri(4-aminophenyl)benzene crosslinking agent, 0.2 parts of 1098 antioxidant, 0.2 parts of 168 antioxidant, 0.4 parts of Licomont Cav102 nucleating agent, 0.4 parts of PETS dispersant, and 0.5 parts of PA masterbatch;

[0048] The hard segment of the polyamide elastomer is PA6 prepolymer, and the soft segment is polytetrahydrofuran-based polyetheramine; the mass ratio of the hard segment to the soft segment is 80:20; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 20g / 10min.

[0049] (2) Place all the raw materials in a high-speed mixer and stir for 5 minutes to obtain a mixed material;

[0050] (3) The mixed material is added to the main feeding port of a twin-screw extruder through a loss-in-weight scale, and after melting, extrusion, pelletizing and drying, a wear-resistant and tear-resistant polyamide elastomer composition is obtained.

[0051] The temperature of zone 1 of the twin-screw extruder is 170°C, the temperature of zone 2 is 210°C, the temperature of zone 3 is 210°C, the temperature of zone 4 is 210°C, the temperature of zone 5 is 210°C, the temperature of zone 6 is 210°C, the temperature of zone 7 is 210°C, the temperature of zone 8 is 210°C, the temperature of zone 9 is 210°C, the temperature of zone 10 is 210°C, and the head temperature is 210°C; the screw speed is 300r / min.

[0052] Example 2

[0053] (1) Weigh the following raw materials: 87.095 parts of polyamide elastomer, 10 parts of PTFE wear-resistant powder, 0.7 parts of 1,3,5-tris(4-carboxyphenyl)benzene crosslinking agent, 0.2 parts of 1098 antioxidant, 0.2 parts of 168 antioxidant, 0.2 parts of BRUGGOLEN P22 nucleating agent, 0.6 parts of EBS dispersant, 1 part of PE masterbatch, and 0.005 parts of OB-1 fluorescent brightener;

[0054] The hard segment of the polyamide elastomer is PA510 prepolymer, and the soft segment is polyethylene glycol-based polyetheramine; the mass ratio of the hard segment to the soft segment is 75:25; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 30g / 10min.

[0055] (2) Place all the raw materials in a high-speed mixer and stir for 5 minutes to obtain a mixed material;

[0056] (3) The mixed material is added to the main feeding port of a twin-screw extruder through a loss-in-weight scale, and after melting, extrusion, pelletizing and drying, a wear-resistant and tear-resistant polyamide elastomer composition is obtained.

[0057] The temperature of zone 1 of the twin-screw extruder is 170°C, the temperature of zone 2 is 210°C, the temperature of zone 3 is 210°C, the temperature of zone 4 is 210°C, the temperature of zone 5 is 210°C, the temperature of zone 6 is 210°C, the temperature of zone 7 is 210°C, the temperature of zone 8 is 210°C, the temperature of zone 9 is 210°C, the temperature of zone 10 is 210°C, and the head temperature is 210°C; the screw speed is 200r / min.

[0058] Example 3

[0059] (1) Weigh the following raw materials: 90.995 parts of polyamide elastomer, 5 parts of POM wear-resistant powder, 1 part of 1,3,5-tris(4-hydroxyphenyl)benzene crosslinker, 0.5 parts of 1098 antioxidant, 0.5 parts of 168 antioxidant, 0.6 parts of Licomont Cav102 nucleating agent, 0.3 parts of EBS dispersant, 2 parts of PA masterbatch, and 0.005 parts of OB-1 fluorescent brightener;

[0060] The hard segment of the polyamide elastomer is PA610 prepolymer, and the soft segment is polytetrahydrofuran-based polyetheramine; the mass ratio of the hard segment to the soft segment is 65:35; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 40g / 10min.

[0061] (2) Place all the raw materials in a high-speed mixer and stir for 5 minutes to obtain a mixed material;

[0062] (3) The mixed material is added to the main feeding port of a twin-screw extruder through a loss-in-weight scale, and after melting, extrusion, pelletizing and drying, a wear-resistant and tear-resistant polyamide elastomer composition is obtained.

[0063] The temperature of zone 1 of the twin-screw extruder is 160°C, the temperature of zone 2 is 200°C, the temperature of zone 3 is 200°C, the temperature of zone 4 is 200°C, the temperature of zone 5 is 200°C, the temperature of zone 6 is 200°C, the temperature of zone 7 is 200°C, the temperature of zone 8 is 200°C, the temperature of zone 9 is 200°C, the temperature of zone 10 is 200°C, and the head temperature is 200°C; the screw speed is 100r / min.

[0064] Example 4

[0065] (1) Weigh the following raw materials: 95.895 parts of polyamide elastomer, 3 parts of PTFE wear-resistant powder, 0.2 parts of 1,3,5-tris(4-aminophenyl) crosslinking agent, 0.3 parts of 1098 antioxidant, 0.3 parts of 168 antioxidant, 0.1 parts of BRUGGOLEN P22 nucleating agent, 0.2 parts of PETS dispersant, and 0.005 parts of OB-1 fluorescent brightener;

[0066] The hard segment of the polyamide elastomer is PA512 prepolymer, and the soft segment is polypropylene glycol-based polyetheramine; the mass ratio of the hard segment to the soft segment is 90:10; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 10g / 10min.

[0067] (2) Place all the raw materials in a high-speed mixer and stir for 5 minutes to obtain a mixed material;

[0068] (3) The mixed material is added to the main feeding port of a twin-screw extruder through a loss-in-weight scale, and after melting, extrusion, pelletizing and drying, a wear-resistant and tear-resistant polyamide elastomer composition is obtained.

[0069] The temperature of zone 1 of the twin-screw extruder is 180°C, the temperature of zone 2 is 230°C, the temperature of zone 3 is 230°C, the temperature of zone 4 is 230°C, the temperature of zone 5 is 230°C, the temperature of zone 6 is 230°C, the temperature of zone 7 is 230°C, the temperature of zone 8 is 230°C, the temperature of zone 9 is 230°C, the temperature of zone 10 is 230°C, and the head temperature is 230°C; the screw speed is 400r / min.

[0070] Example 5

[0071] (1) Weigh the following raw materials: 92.39 parts of polyamide elastomer, 5 parts of PTFE wear-resistant powder, 0.3 parts of 1,3,5-tris(4-aminophenyl) crosslinking agent, 0.3 parts of 1098 antioxidant, 0.3 parts of 168 antioxidant, 0.3 parts of Licomont Cav102 nucleating agent, 0.4 parts of PETS dispersant, 1 part of PA masterbatch, and 0.01 parts of OB fluorescent brightener;

[0072] The hard segment of the polyamide elastomer is PA1012 prepolymer, and the soft segment is polyethylene glycol-based polyetheramine; the mass ratio of the hard segment to the soft segment is 80:20; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 25g / 10min.

[0073] (2) Place all the raw materials in a high-speed mixer and stir for 5 minutes to obtain a mixed material;

[0074] (3) The mixed material is added to the main feeding port of a twin-screw extruder through a loss-in-weight scale, and after melting, extrusion, pelletizing and drying, a wear-resistant and tear-resistant polyamide elastomer composition is obtained.

[0075] The temperature of zone 1 of the twin-screw extruder is 150°C, the temperature of zone 2 is 190°C, the temperature of zone 3 is 190°C, the temperature of zone 4 is 190°C, the temperature of zone 5 is 190°C, the temperature of zone 6 is 190°C, the temperature of zone 7 is 190°C, the temperature of zone 8 is 190°C, the temperature of zone 9 is 190°C, the temperature of zone 10 is 190°C, and the head temperature is 190°C; the screw speed is 300r / min.

[0076] The present invention also provides comparative examples as shown below.

[0077] Comparative Example 1

[0078] The commercially available material is a badminton racket string retaining nail composition made of PA6.

[0079] Comparative Example 2

[0080] The commercially available material is a badminton racket string nail composition made of PA12.

[0081] Comparative Example 3

[0082] Except that the melt index of the polyamide elastomer at 235°C / 2.16kg is 60g / 10min, the rest is consistent with Example 1.

[0083] Comparative Example 4

[0084] Except for the different raw material components, the rest are consistent with Example 2. The raw material components of this comparative example are as follows:

[0085] 87.095 parts of polyamide elastomer, 10.7 parts of PTFE wear-resistant powder, 0.2 parts of 1098 antioxidant, 0.2 parts of 168 antioxidant, 0.2 parts of BRUGGOLEN P22 nucleating agent, 0.6 parts of EBS dispersant, 1 part of PE masterbatch, 0.005 parts of OB-1 fluorescent brightener;

[0086] The hard segment of the polyamide elastomer is PA510 prepolymer, and the soft segment is polyethylene glycol-based polyetheramine; the mass ratio of the hard segment to the soft segment is 75:25; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 30g / 10min.

[0087] Comparative Example 5

[0088] Except for the different raw material components, the rest are consistent with Example 2. The raw material components of this comparative example are as follows:

[0089] 97.795 parts of polyamide elastomer, 0.2 parts of 1098 antioxidant, 0.2 parts of 168 antioxidant, 0.2 parts of BRUGGOLEN P22 nucleating agent, 0.6 parts of EBS dispersant, 1 part of PE masterbatch, 0.005 parts of OB-1 fluorescent brightener;

[0090] The hard segment of the polyamide elastomer is PA510 prepolymer, and the soft segment is polyethylene glycol-based polyetheramine; the mass ratio of the hard segment to the soft segment is 75:25; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 30g / 10min.

[0091] Comparative Example 6

[0092] Except for the different raw material components, the rest is consistent with Example 3. The raw material components of this comparative example are as follows:

[0093] 91.995 parts of polyamide elastomer, 5 parts of POM wear-resistant powder, 0.5 parts of 1098 antioxidant, 0.5 parts of 168 antioxidant, 0.6 parts of Licomont Cav102 nucleating agent, 0.3 parts of EBS dispersant, 2 parts of PA masterbatch, 0.005 parts of OB-1 fluorescent brightener;

[0094] The hard segment of the polyamide elastomer is PA610 prepolymer, and the soft segment is polytetrahydrofuran-based polyetheramine; the mass ratio of the hard segment to the soft segment is 65:35; and the melt index of the polyamide elastomer at 235°C / 2.16kg is 40g / 10min.

[0095] After homogenization treatment of the composition particles obtained in the above examples and comparative examples, injection molding of the specimens was carried out and relevant indicators were tested. Tensile strength test standard reference: GB / T 1040.2-2006; Elongation at break test standard reference: GB / T1040.2-2006; Tensile modulus test reference: GB / T 1040.2-2006; Tear strength test standard reference: GB / T 529-2008; Abrasion test standard reference: GB / T 5478-2008; Rebound resilience test standard reference: GB / T 1681-2009; Water absorption test reference: GB / T 1034-2008; Crystallinity test: The crystallinity of the composition is defined by the hard segment content of the polyamide elastomer material: 00%, wherein ΔHc is the melting enthalpy of the composition, ΔH1 is the melting enthalpy of the polyamide elastomer hard segment material, and WH is the hard segment content of the polyamide elastomer material. The test results are shown in Table 1 below:

[0096] Table 1

[0097]

[0098] According to the test results in Table 1, the tear strength, abrasion resistance, tensile strength, elongation at break and resilience of the wear-resistant and tear-resistant polyamide elastomer compositions prepared in Examples 1 to 5 of the present invention are superior to those of commercially available PA6 and PA12 cable nails. The introduction of a polyether segment into the middle section of the polyamide molecular chain reduces the crystallinity and water absorption of the polymer, making the cable nails prepared from the composition of the present invention more punchable and resistant.

[0099] A comprehensive comparison between Example 1 and Comparative Example 3 shows that the polyamide elastomer has a too large melt index and little difference in comprehensive performance, but the wire nail is prone to collapse and stickiness during injection molding, and has insufficient processing performance.

[0100] A comprehensive comparison of Example 2 and Comparative Examples 4-5 shows that the PTFE wear-resistant powder and the cross-linking agent have a synergistic effect. The simultaneous addition of the two improves the wear resistance and resilience of the composition, and also significantly improves the tensile strength of the composition. This is mainly because the PTFE powder not only acts as a wear-resistant agent, but also plays a role as a reinforcing filler, and at the same time acts as a stress concentration point in the three-dimensional grid structure of the matrix, thereby improving the resilience of the composition.

[0101] A comprehensive comparison of Example 3 and Comparative Example 6 shows that the addition of 1,3,5-tri(4-hydroxyphenyl)benzene greatly improves the tensile strength, elongation at break, and tear strength of the composition. This is because the trifunctional 1,3,5-tri(4-hydroxyphenyl)benzene can cross-link with the polyamide elastomer molecules to form a three-dimensional network structure, thereby improving the mechanical properties and resilience of the composition; the abrasion value is increased from 132 mm to 132 mm. 3 Down to 124mm 3This indicates that the addition of 1,3,5-tri(4-hydroxyphenyl)benzene also improves the wear resistance of the composition.

[0102] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0103] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A wear-resistant and tear-resistant polyamide elastomer composition, characterized in that: It is prepared from the following components in parts by weight: Polyamide elastomer 87.1~95.9 parts, 3~10 parts of anti-wear agent, Cross-linking agent 0.2~1 part, Antioxidant 0.4~1 part, Nucleating agent 0.1~0.6 parts, Dispersant 0.2~0.6 parts, Masterbatch 0~2 parts, Fluorescent whitening agent 0~0.01 parts; The wear-resistant agent is one of polytetrafluoroethylene powder and polyoxymethylene powder; The cross-linking agent is at least one of 1,3,5-tris(4-hydroxyphenyl)benzene, 1,3,5-tris(4-carboxyphenyl)benzene, and 1,3,5-tris(4-aminophenyl)benzene; The preparation method of the wear-resistant and tear-resistant polyamide elastomer composition comprises the following steps: S1: Weigh each component by weight, mix them evenly, and obtain a mixed material; S2: adding the mixed material to the main feeding port of the twin-screw extruder, and after melting, extrusion, pelletizing and drying, a wear-resistant and tear-resistant polyamide elastomer composition is obtained; The hard segment of the polyamide elastomer is polyamide, and the soft segment is polyether; The polyamide elastomer is prepared by polycondensation reaction of a polyamide prepolymer and a polyether amine in a mass ratio of (65-90): (10-35); The polyamide elastomer has a melt index of 10-40 g / 10 min at 235° C. / 2.16 kg.

2. The wear-resistant and tear-resistant polyamide elastomer composition according to claim 1, characterized in that: The polyamide prepolymer is at least one of polycaprolactam, polypentamethylenediamine sebacic acid resin, polyhexamethylenediamine sebacic acid, polypentamethylenediamine dodecanoic acid, polyhexamethylenediamine dodecanoic acid, and PA1012.

3. The wear-resistant and tear-resistant polyamide elastomer composition according to claim 1, characterized in that: The polyetheramine is at least one of polyethylene glycol-based polyetheramine, polypropylene glycol-based polyetheramine and polytetrahydrofuran-based polyetheramine.

4. The wear-resistant and tear-resistant polyamide elastomer composition according to claim 1, characterized in that: The antioxidant is at least one of a hindered phenol antioxidant, an amine antioxidant, a phosphite antioxidant, and a thioester antioxidant.

5. The wear-resistant and tear-resistant polyamide elastomer composition according to claim 1, characterized in that: The dispersant is at least one of ethylene bisstearamide and pentaerythritol stearate.

6. The wear-resistant and tear-resistant polyamide elastomer composition according to claim 1, characterized in that: The masterbatch is at least one of a PA masterbatch and a PE masterbatch.

7. The wear-resistant and tear-resistant polyamide elastomer composition according to claim 1, characterized in that: The fluorescent whitening agent is at least one of 4,4'-di(benzoxazol-2-yl) trans-stilbene and 2,5-bis-(5-tert-butyl-2-benzoxazolyl)thiophene.

8. The wear-resistant and tear-resistant polyamide elastomer composition according to claim 1, characterized in that: The temperature of one zone of the twin-screw extruder is 150-180° C., and the temperature of other zones and the die head is 190-230° C.; the screw speed is 100-400 r / min.

9. Use of the wear-resistant and tear-resistant polyamide elastomer composition according to any one of claims 1 to 8 as a badminton racket string spike.

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