High-toughness polyamide fiber composite material and preparation method thereof

Abstract

The invention belongs to the field of novel polyamide composite fiber materials, and particularly discloses a high-toughness polyamide fiber composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 55-75 parts of long-chain polyamide PA610 resin, 10-25 parts of ultra-high molecular weight polyethylene fiber, 8-18 parts of polyether block amide elastomer, 1.5-4 parts of a compound nucleating agent, 0.8-2 parts of a titanate coupling agent and 0.3-1 part of a composite antioxidant. The preparation method is characterized by comprising the following steps: firstly, carrying out surface pretreatment on the ultra-high molecular weight polyethylene fiber by adopting a low-temperature plasma technology so as to improve the interfacial compatibility of the ultra-high molecular weight polyethylene fiber and a resin matrix; and then carrying out melt blending granulation on the pretreated fiber and other raw materials through a twin-screw extruder, wherein the fiber is added from a side feeding port to avoid excessive shearing and breaking. The obtained product has ultrahigh impact toughness, excellent rigidity, excellent low-temperature toughness and heat resistance, and is especially suitable for the fields of manufacturing automobile parts, sports protection equipment and the like with extremely high requirements on toughness and durability.

Description

Technical Field

[0001] This invention belongs to the field of novel polyamide composite fiber materials, and specifically discloses a high-toughness polyamide fiber composite material and its preparation method. Background Technology

[0002] In the fields of automotive lightweighting, high-end sports equipment, and precision instrument manufacturing, the requirements for the comprehensive performance of structural materials are becoming increasingly stringent. In particular, when used to manufacture products such as bumpers, engine peripheral parts, skis, and safety helmets, materials not only need to have sufficiently high strength and modulus to withstand loads, but also need to have excellent toughness to absorb impact energy and prevent sudden fracture, thereby ensuring safety and structural integrity.

[0003] Currently, the main technical approaches to improving the mechanical properties of polyamide materials are fiber reinforcement and elastomer toughening. Fiber reinforcement technology significantly improves the rigidity, strength, and heat distortion temperature of materials by combining high-strength fibers such as glass fibers and carbon fibers with a polyamide matrix. However, this technology has significant drawbacks: while the introduction of rigid fibers increases strength, it often leads to increased brittleness, a significant decrease in impact toughness, notch sensitivity, and elongation at break, making the material prone to brittle fracture under high impact loads.

[0004] Elastomer toughening technology involves blending soft phases such as rubber and thermoplastic elastomers with polyamides. This process induces crazing and shear banding mechanisms to dissipate energy, thereby improving the material's impact toughness. However, this technology also faces inherent challenges: First, the introduction of large amounts of elastomers inevitably sacrifices the material's rigidity, strength, and heat resistance, leading to a significant reduction in modulus and heat distortion temperature—the so-called "toughness-rigidity" contradiction. Second, most elastomers have poor compatibility with the polyamide matrix, easily resulting in phase separation and weak interfacial bonding, leading to low stress transfer efficiency, limited toughening effect, and even becoming internal defects in the material.

[0005] While existing blending modification technologies attempt to combine fiber reinforcement with elastomer toughening to achieve a balance, they still face significant challenges: First, the dispersion and uniformity of various fillers (rigid fibers and soft elastomers) in the matrix are difficult to control synergistically, easily leading to uneven dispersion and localized agglomeration. Second, poor interfacial compatibility between the components and the matrix, as well as between different components, results in weak interfacial layers, preventing effective stress transfer and hindering the efficient synergy of rigidity and toughness. Third, maintaining the aspect ratio of fibers and preventing excessive breakage while simultaneously achieving uniform micro-nano-scale dispersion of elastomers in complex processing environments remains a technological bottleneck restricting the improvement of material performance.

[0006] Therefore, there is an urgent need for an innovative material formulation and preparation process to solve the core problems of compatibility, dispersibility and interfacial strength of multiphase and multicomponent systems, so as to prepare a high-performance polyamide fiber composite material that truly achieves a balance between rigidity and toughness. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention provides a high-toughness polyamide fiber composite material and its preparation method.

[0008] This invention includes the following technical solutions:

[0009] A method for preparing a high-toughness polyamide fiber composite material includes the following steps:

[0010] (1) Raw material preparation: Prepare the following raw materials by weight:

[0011] 55-75 parts of long-chain polyamide PA610 resin;

[0012] 10-25 parts of ultra-high molecular weight polyethylene fiber;

[0013] 8-18 parts of polyether block amide elastomer;

[0014] Mix 1.5-4 parts of nucleating agent;

[0015] Titanate coupling agent 0.8-2 parts;

[0016] 0.3-1 part of compound antioxidant;

[0017] (2) Fiber pretreatment: The ultra-high molecular weight polyethylene fiber is placed in a low-temperature plasma treatment device and treated for 2-5 minutes at 100-200W power under a nitrogen atmosphere to improve its interfacial compatibility with the resin matrix.

[0018] (3) Melt blending and extrusion granulation: The PA610 resin, polyether block amide elastomer, compound nucleating agent, titanate coupling agent and composite antioxidant prepared in step (1) are premixed in a high-speed mixer and then added together with the ultra-high molecular weight polyethylene fiber treated in step (2) into a twin-screw extruder. After melt blending, extrusion, water cooling, pelletizing and drying, the high-toughness polyamide fiber composite material is obtained. The temperature of each section of the twin-screw extruder from the feed port to the die head is set to 220℃, 235℃, 245℃, 250℃ and 245℃, and the screw speed is 250-350r / min.

[0019] Furthermore, in the above preparation method, the length of the ultra-high molecular weight polyethylene fiber is 2-4 mm and the fineness is 2-5 D.

[0020] Furthermore, in the above preparation method, the molecular weight of the soft segment polyether in the polyether block amide elastomer is 600-1000.

[0021] Furthermore, in the above preparation method, the compound nucleating agent is a complex composed of nano-silica and N,N'-ethylene bis-stearamide in a mass ratio of 1:(0.5-2).

[0022] Furthermore, in the above preparation method, the composite antioxidant is a compound system composed of antioxidant 1098 and antioxidant 168 in a mass ratio of 1:(1-2).

[0023] This invention discloses a high-toughness polyamide fiber composite material, which is prepared by any one of the above preparation methods.

[0024] Furthermore, the aforementioned composite material has a notched impact strength (test standard ISO 179) of ≥45 kJ / m². 2 Tensile strength (test standard ISO 527) ≥ 95 MPa.

[0025] Furthermore, the aforementioned composite material retains ≥80% of its notched impact strength at a low temperature of -40°C.

[0026] The present invention also discloses the application of the above-mentioned high-toughness polyamide fiber composite material in the preparation of vibration damping components or buffer pads for precision instruments.

[0027] This invention also discloses the application of the above-mentioned high-toughness polyamide fiber composite material in the preparation of outdoor sports equipment, including ski bindings, bicycle helmets, or rock climbing protective gear.

[0028] Compared with the prior art, the present invention has the following outstanding advantages:

[0029] 1) Excellent toughness: This invention imparts extremely high impact strength to the material through the synergistic toughening effect of polyether block amide elastomer (PEBA) and plasma-treated ultra-high molecular weight polyethylene fiber (UHMWPE). Its notched impact strength is several times that of traditional glass fiber reinforced polyamide, effectively avoiding brittle fracture under impact, and significantly improving safety and reliability.

[0030] 2) Excellent balance of stiffness and toughness: The unique formulation design overcomes the difficulty of achieving both toughening and reinforcement in traditional technologies. UHMWPE fibers and compound nucleating agents effectively toughen the material while ensuring high tensile strength, flexural modulus and heat distortion temperature, achieving a perfect balance of high strength, high modulus and high toughness.

[0031] 3) Excellent low-temperature performance: Due to the use of flexible PA610 resin and PEBA elastomer, and the achievement of a strong interfacial bond with UHMWPE fiber, the composite material can still maintain more than 80% of its impact strength in a low-temperature environment of -40℃, showing excellent low-temperature toughness and broadening its application range in cold regions.

[0032] 4) Durable performance stability: The low-temperature plasma treatment technology fundamentally solves the interfacial problem of poor compatibility between UHMWPE fibers and the polyamide matrix, forming a strong and tough interfacial bonding layer. This ensures that the fibers are uniformly dispersed and firmly bonded in the composite material, making them less prone to debonding and failure under long-term use or fatigue loads, thus ensuring the durability and stability of mechanical properties. Attached Figure Description

[0033] Figure 1 Notched impact strength (kJ / m) of the embodiment and comparative examples in Test Example 1 2 )Compare;

[0034] Figure 2 Room temperature impact strength (kJ / m) of each material in Test Example 2 2 Comparison of )

[0035] Figure 3 Impact strength (kJ / m) of each material at -40℃ in Test Example 2 2 Comparison of )

[0036] Figure 4 Comparison of the low-temperature strength retention rate (%) of each material in Test Example 2. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The following is a list of raw materials for this invention.

[0039] Table 1: Raw Material List

[0040] Example 1

[0041] A high-toughness polyamide fiber composite material, made from the following raw materials in parts by weight:

[0042] 70 parts of long-chain polyamide PA610 resin;

[0043] 18 parts of ultra-high molecular weight polyethylene fiber (3mm, 3D);

[0044] 12 parts of polyether block amide elastomer (PEBA, soft segment MW=800);

[0045] 2.5 parts of compound nucleating agent (nano silica: EBS = 1:1);

[0046] 1.2 parts of titanate coupling agent (NDZ-101);

[0047] 0.5 parts of compound antioxidant (1098:168 = 1:1);

[0048] Its preparation method includes the following steps:

[0049] (1) Fiber pretreatment: The ultra-high molecular weight polyethylene fiber is placed in a low-temperature plasma treatment device and treated for 3.5 minutes at 150W power under a nitrogen atmosphere. After treatment, it is sealed and stored for later use.

[0050] (2) Premixing: PA610 resin, polyether block amide elastomer, compound nucleating agent, titanate coupling agent and composite antioxidant are added to a high-speed mixer and mixed at 1200r / min for 8 minutes to obtain a premix.

[0051] (3) Melt blending and granulation: The premix obtained in step (2) is added from the main feed port of the twin-screw extruder, and the ultra-high molecular weight polyethylene fiber processed in step (1) is added quantitatively from the side feed port for melt blending, extrusion and granulation. The temperature settings of each section of the twin-screw extruder are: Zone 1 220℃, Zone 2 235℃, Zone 3 245℃, Zone 4 250℃, and Die head 245℃; the screw speed is 300 r / min.

[0052] (4) Drying: The obtained composite material particles are dried by blowing at 90°C for 5 hours and then set aside.

[0053] Example 2

[0054] A high-toughness polyamide fiber composite material, made from the following raw materials in parts by weight:

[0055] 65 parts of long-chain polyamide PA610 resin;

[0056] 22 parts of ultra-high molecular weight polyethylene fiber (4mm, 4D);

[0057] 10 parts of polyether block amide elastomer (PEBA, soft segment MW=1000);

[0058] Three parts of compound nucleating agent (nano silica: EBS = 1:1.5);

[0059] 1.5 parts of titanate coupling agent (NDZ-101);

[0060] 0.6 parts of compound antioxidant (1098:168 = 1:1);

[0061] Its preparation method is basically the same as that in Example 1, except that:

[0062] In step (1), the plasma processing power is 180W and the processing time is 3 minutes;

[0063] In step (3), the screw speed of the twin-screw extruder is 280 r / min.

[0064] Example 3

[0065] A high-toughness polyamide fiber composite material, made from the following raw materials in parts by weight:

[0066] 75 parts of long-chain polyamide PA610 resin;

[0067] 15 parts of ultra-high molecular weight polyethylene fiber (2.5mm, 2.5D);

[0068] 15 parts of polyether block amide elastomer (PEBA, soft segment MW=600);

[0069] Two parts of a compound nucleating agent (nano silica: EBS = 1:0.8);

[0070] 1.0 part of titanate coupling agent (NDZ-101);

[0071] 0.4 parts of compound antioxidant (1098:168 = 1:1);

[0072] Its preparation method is basically the same as that in Example 1, except that:

[0073] In step (1), the plasma processing power is 120W and the processing time is 4 minutes;

[0074] In step (3), the screw speed of the twin-screw extruder is 320 r / min.

[0075] Comparative Example 1

[0076] A composite fiber material, whose raw materials and preparation method are exactly the same as those in Example 1, the only difference being that the raw materials do not contain polyether block amide elastomer (PEBA), and its weight parts are made up by PA610 resin (i.e., PA610 is 82 parts).

[0077] Comparative Example 2

[0078] A composite fiber material, whose raw materials and preparation method are exactly the same as those in Example 1, the only difference being that: the raw materials do not contain ultra-high molecular weight polyethylene fibers, and their weight parts are made up by PA610 resin (i.e., PA610 is 88 parts).

[0079] Comparative Example 3

[0080] A composite fiber material, whose raw materials and preparation method are exactly the same as those in Example 1, the only difference being that the ultra-high molecular weight polyethylene fiber is used directly without any low-temperature plasma pretreatment.

[0081] Comparative Example 4

[0082] A composite fiber material, whose raw materials are exactly the same as those in Example 1, but whose preparation method is as follows:

[0083] Step (3) Change of melt blending process: The screw speed of the twin-screw extruder is 180 r / min (low speed mixing).

[0084] The remaining steps are exactly the same as in Example 1.

[0085] Comparative Example 5

[0086] A traditional glass fiber reinforced polyamide material, made from the following raw materials in parts by weight:

[0087] 70 parts of polyamide PA66 resin;

[0088] 18 parts of chopped glass fiber (alkali-free, 3mm);

[0089] 12 parts of maleic anhydride-grafted POE elastomer;

[0090] Antioxidant 1010 0.5 parts;

[0091] The preparation method is conventional melt blending and granulation. After premixing, all components are added to the twin-screw extruder from the main feed port. The temperature is set to 260-280℃ and the screw speed is 300r / min.

[0092] Comparative Example 6

[0093] A commercially available high-toughness reinforced polyamide material, brand name BASF B3ZG7 CR is a glass fiber reinforced modified PA6 product.

[0094] Test Example 1

[0095] Core mechanical and toughness performance testing

[0096] Objective: To comprehensively verify the high toughness and high strength properties of the composite material, and to systematically examine the contributions of each key component (PEBA elastomer, UHMWPE fiber) and the core process (plasma treatment).

[0097] method:

[0098] According to ISO 179, ISO 527 and ISO 178 standards, the notched impact strength, tensile strength and flexural modulus of the composite material specimens prepared in Examples 1-3 and Comparative Examples 1-6 were tested respectively.

[0099] The results are shown in Table 2 and Figure 1 .

[0100] Table 2: Test results of core mechanical and toughness properties.

[0101] Group <![CDATA[Izod impact strength (kJ / m 2 )]]> Tensile strength (MPa) Flexural modulus (GPa) Example 1 48.5 98.2 3.8 Example 2 46.2 96.8 3.9 Example 3 50.1 95.5 3.6 Comparative Example 1 (without PEBA elastomer) 25.3 105.6 4.5 Comparative Example 2 (without UHMWPE fibers) 35.7 78.4 2.8 Comparative Example 3 (untreated fibers) 32.9 89.1 3.5 Comparative Example 4 (Low-speed mixing) 38.5 92.5 3.6 Comparative Example 5 (Traditional GF / PA66) 15.8 135.0 6.2 Comparative Example 6 (Commercially available high-toughness PA6) 12.5 120.0 5.5

[0102] Conclusion: All embodiments of the present invention (1-3) exhibit excellent impact toughness (>46kJ / m). 2 The invention achieves a good balance between strength and toughness. Comparative Example 1 demonstrates that the material's toughness drops sharply and it becomes brittle without the PEBA elastomer. Comparative Example 2 demonstrates that the material's strength and stiffness are significantly insufficient without UHMWPE fibers. Comparative Example 3 demonstrates that the poor interfacial bonding between the untreated fibers and the matrix leads to a decline in all properties, proving the necessity of this pretreatment step. Comparative Example 4 demonstrates that process optimization is crucial for achieving the desired performance. Comparative Examples 5 and 6 starkly contrast the significant advantages of this invention over traditional reinforcing materials in achieving ultra-high toughness.

[0103] Test Example 2

[0104] Low temperature toughness test

[0105] Objective: To evaluate the toughness retention rate of materials under harsh low-temperature environments, which is a key indicator for measuring their application potential in cold regions or special occasions.

[0106] method:

[0107] After placing the specimens of Example 2 (representing the present invention), Comparative Example 1 (without toughening), and Comparative Example 5 (conventional material) in a -40°C low-temperature environment for 4 hours, their notched impact strength was immediately tested according to ISO 179 standard, and their retention rate relative to the room temperature impact strength was calculated.

[0108] The results are shown in Table 3 and Figure 2-4 .

[0109] Table 3: Low-temperature (-40℃) toughness test results.

[0110]

[0111] Conclusion: Example 2 of the present invention maintains excellent toughness (37.4 kJ / m) even at an extreme low temperature of -40℃. 2The material exhibits excellent low-temperature performance with a high toughness retention rate (81%). In contrast, Comparative Examples 1 and 5 showed embrittlement at low temperatures, with toughness retention rates below 50%, failing to meet the requirements for use in harsh environments. This test demonstrates the effectiveness of the material composition design and interface control of this invention in improving low-temperature toughness.

[0112] Test Example 3

[0113] Durability and fatigue resistance testing

[0114] Objective: To evaluate the performance stability of materials under long-term or repeated loading and to simulate actual working conditions.

[0115] method:

[0116] According to ISO 6721-1 standard, the loss factor (tanδ) of Example 2 and Comparative Example 5 was tested using a Dynamic Mechanical Analyzer (DMA). A lower peak value and narrower width of tanδ generally indicate lower internal friction and better fatigue resistance in the material. Simultaneously, compressive fatigue tests (10^5 cycles, maximum stress of 70% of yield strength) were performed according to ASTM D7774 standard to measure the permanent deformation before and after fatigue.

[0117] The results are shown in Table 4.

[0118] Table 4: Dynamic mechanical properties and fatigue test results.

[0119] Group DMA loss factor (tanδ) peak value Permanent deformation due to compressive fatigue (mm) Example 2 0.035 0.12 Comparative Example 5 (Conventional Materials) 0.051 0.38

[0120] Conclusion: The tanδ peak value of Example 2 of the present invention is significantly lower than that of Comparative Example 5, indicating that its molecular chain segment motion has low internal friction and low energy dissipation, suggesting superior fatigue resistance. Compression fatigue test results directly prove that after 10^5 load cycles, Example 2 exhibits a much better deformation recovery capability than traditional materials, with permanent deformation only one-third of the latter. This indicates that the material of the present invention has a longer service life and better dimensional stability.

[0121] Test Example 4

[0122] Heat resistance and heat distortion temperature test

[0123] Objective: To evaluate the rigidity and shape stability of composite materials under heated conditions, which is crucial for their application in scenarios such as automotive engine compartments, instruments requiring high-temperature sterilization, or summer outdoor environments.

[0124] method:

[0125] According to ASTM D648 standard, the heat deflection temperature (HDT) of Example 2 (representing the present invention), Comparative Example 2 (without UHMWPE fiber), and Comparative Example 5 (conventional GF / PA66 material) were tested under a bending load of 1.82 MPa.

[0126] The results are shown in Table 5.

[0127] Table 5: Test results of heat distortion temperature (HDT@1.82MPa).

[0128] Group Heat distortion temperature (HDT) (°C) Example 2 192 Comparative Example 2 (without UHMWPE fibers) 165 Comparative Example 5 (Traditional GF / PA66 material) 255

[0129] Conclusion: Test results show that the heat distortion temperature (HDT) of Example 2 of this invention reached 192℃, a significant improvement (+27℃) compared to Comparative Example 2 (without reinforcing fiber). This demonstrates that the reinforcing effect of ultra-high molecular weight polyethylene (UHMWPE) fibers effectively improves the heat resistance and creep resistance of the matrix resin. Although its HDT is still lower than that of traditional glass fiber reinforced materials (Comparative Example 5, 255℃), it is much higher than that of general-purpose plastics, fully meeting the operating temperature requirements of most automotive interior and exterior parts and sports equipment. This data proves that this invention successfully maintains the necessary heat resistance of the material while achieving ultra-high toughness, reaching a balance point for application.

[0130] As can be seen from tests 1-4 above, the material of this invention exhibits excellent high toughness and comprehensive performance:

[0131] 1. Room temperature toughness: Notched impact strength can reach up to 50.1 kJ / m. 2 Several times that of traditional glass fiber reinforced polyamide (~15.8kJ / m³) 2 ).

[0132] 2. Low temperature toughness: It can still maintain more than 81% of its impact strength at -40℃, which is far superior to the comparison sample.

[0133] 3. Strength and toughness balance: While achieving ultra-high toughness, the tensile strength is maintained above 95MPa and the flexural modulus is maintained above 3.6GPa.

[0134] 4. Durability: It exhibits a lower loss factor (tanδ=0.035) and better fatigue resistance (permanent deformation 0.12mm).

[0135] 5. Heat resistance: The heat distortion temperature reaches 192℃, which provides good high-temperature dimensional stability and meets a wide range of application requirements.

[0136] It is worth noting that the above description of the embodiments focuses on illustrating the technical solution of the present invention, rather than precisely defining its scope of protection. Those skilled in the art should understand that appropriate adjustments and optimizations can be made based on the technical details disclosed in the embodiments of the present invention, or equivalent substitutions can be implemented for individual or even all technical elements. Such adjustments and substitutions will not deviate from the core essence of the technical solution of the present invention and should be included within the technical protection scope of the embodiments of the present invention. In short, the protection of the present invention should not be limited to the concrete presentation of the above embodiments, but broadly covers all equivalent changes and improvements that do not depart from its basic concept. In summary, the protection definition of the present invention should be based on the statement of the claims, and the above embodiments are only used as a reference guide for understanding the present invention.

Claims

1. A method for preparing a high-toughness polyamide fiber composite material, characterized in that, Includes the following steps: (1) Raw material preparation: Prepare the following raw materials by weight: 55-75 parts of long-chain polyamide PA610 resin; 10-25 parts of ultra-high molecular weight polyethylene fiber; 8-18 parts of polyether block amide elastomer; Mix 1.5-4 parts of nucleating agent; Titanate coupling agent 0.8-2 parts; 0.3-1 part of compound antioxidant; (2) Fiber pretreatment: The ultra-high molecular weight polyethylene fiber is placed in a low-temperature plasma treatment device and treated for 2-5 minutes at a power of 100-200W under a nitrogen atmosphere to improve its interfacial compatibility with the resin matrix. (3) Melt blending and extrusion granulation: The PA610 resin, polyether block amide elastomer, compound nucleating agent, titanate coupling agent and composite antioxidant prepared in step (1) are premixed in a high-speed mixer and then added to a twin-screw extruder along with the ultra-high molecular weight polyethylene fiber treated in step (2). After melt blending, extrusion, water cooling, pelletizing and drying, the high-toughness polyamide fiber composite material is obtained. The temperature of each section of the twin-screw extruder from the feed port to the die head is set to 220℃, 235℃, 245℃, 250℃ and 245℃, and the screw speed is 250-350r / min.

2. The preparation method according to claim 1, characterized in that: The ultra-high molecular weight polyethylene fiber has a length of 2-4 mm and a fineness of 2-5 D.

3. The preparation method according to claim 1, characterized in that: The soft segment polyether in the polyether block amide elastomer has a molecular weight of 600-1000.

4. The preparation method according to claim 1, characterized in that: The nucleating agent is a composite material consisting of nano-silica and N,N'-ethylene bis-stearamide in a mass ratio of 1:(0.5-2).

5. The preparation method according to claim 1, characterized in that: The composite antioxidant is a compound system composed of antioxidant 1098 and antioxidant 168 in a mass ratio of 1:(1-2).

6. A high-toughness polyamide fiber composite material, characterized in that: It is prepared by the preparation method described in any one of claims 1-5.

7. The high-toughness polyamide fiber composite material according to claim 6, characterized in that: Its notched impact strength (test standard ISO 179) is ≥ 45 kJ / m², and its tensile strength (test standard ISO 527) is ≥ 95 MPa.

8. The high-toughness polyamide fiber composite material according to claim 6, characterized in that: Its notched impact strength retention rate at -40℃ is ≥ 80%.

9. The application of the high-toughness polyamide fiber composite material as described in claim 6 in the preparation of vibration damping components or buffer pads for precision instruments.

10. The application of the high-toughness polyamide fiber composite material as described in claim 6 in the preparation of outdoor sports equipment, wherein the outdoor sports equipment includes ski bindings, bicycle helmets, or rock climbing protective gear.

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