Radiation crosslinking polyamide composite material and preparation method and application thereof

Abstract

The application discloses a radiation crosslinking polyamide composite material and a preparation method and application thereof. The radiation crosslinking polyamide composite material comprises the following components in parts by weight: 50-70 parts of polyamide resin, 8-15 parts of melamine cyanurate, 0.5-5 parts of a composite crosslinking agent, 0.7-2.5 parts of a light stabilizer, 0.7-2.5 parts of an ultraviolet absorber and 0.05-2 parts of an antioxidant. The composite crosslinking agent comprises a first crosslinking agent and a second crosslinking agent in a mass ratio of (0.22-3.2):1. The first crosslinking agent is at least one of an isocyanuric acid allyl ester crosslinking agent and a melamine cyanurate allyl ester crosslinking agent. The second crosslinking agent is at least one of a vinyl crosslinking agent and an acrylic ester crosslinking agent. The application adds the specific composite crosslinking agent into the polyamide resin containing the melamine cyanurate flame retardant, and then crosslinks the polyamide resin through the radiation method, so that the prepared radiation crosslinking polyamide composite material still has good flame retardant performance and a high glowing filament temperature after long-time light aging.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically, to a radiation-crosslinked polyamide composite material, its preparation method, and its application. Background Technology

[0002] Polyamide resin (commonly known as nylon, PA), as an engineering plastic with excellent comprehensive performance, is widely used in automotive parts, electronic and electrical components, and various outdoor equipment due to its high strength, high toughness, good wear resistance, chemical corrosion resistance, and excellent electrical insulation properties. Especially in the electronics and electrical field, polyamide materials are often used to manufacture key components such as connectors, circuit breakers, power adapter housings, and 5G base station housings. These applications often place extremely high demands on the fire safety performance of materials to prevent fires caused by electrical faults, overheating, or external ignition sources. Therefore, polyamide materials used as housings or structural components must meet stringent flame retardant standards. Furthermore, the glow wire ignition temperature (GWIT), as a key indicator of a material's resistance to ignition under fault overheating conditions, is also very important for plastic materials used in electronics and electrical appliances.

[0003] Nitrogen-based flame retardant melamine cyanurate (MCA), as a highly efficient intumescent flame retardant, has become an important choice for improving the flame retardant performance of polyamide resins due to its low smoke, low toxicity, and non-corrosive gas production during combustion. For example, a Chinese patent for a halogen-free flame-retardant nylon material, its preparation method, and its application involves adding melamine cyanurate as a flame retardant to PA6 resin to obtain a flame-retardant nylon material. The system achieves a UL94 V-0 flame retardant rating with an MCA content of only 10%.

[0004] However, during long-term use, melamine cyanurate-added flame-retardant polyamide resins are prone to molecular chain degradation due to ultraviolet radiation. Furthermore, melamine cyanurate is also prone to precipitating out of the resin and becoming ineffective. This leads to a decrease in the flame-retardant properties of the material and a reduction in the glow wire temperature, posing potential safety hazards and limiting the widespread application of melamine cyanurate-added flame-retardant polyamide resins. Summary of the Invention

[0005] To address the problem that existing melamine cyanurate flame-retardant polyamide resins cannot maintain their flame-retardant properties for extended periods under ultraviolet light and exhibit a significant decrease in glow wire ignition temperature, this invention provides a radiation-crosslinked polyamide composite material. This radiation-crosslinked polyamide composite material can maintain good flame-retardant properties and a high glow wire temperature even after long-term exposure to ultraviolet light.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned radiation-crosslinked polyamide composite material.

[0007] Another object of the present invention is to provide the application of the above-mentioned radiation crosslinked polyamide composite material in the preparation of automotive parts, electronic and electrical parts, outdoor equipment parts, humanoid robot parts or robot dog parts.

[0008] Another object of the present invention is to provide an injection molded part.

[0009] The above-mentioned objective of this invention is achieved through the following technical solution: A polyamide composite material comprising the following components in parts by weight: 50-70 parts of polyamide resin, 8-15 parts of melamine cyanurate 0.5-5 parts of composite crosslinking agent, Light stabilizer 0.7~2.5 parts, 0.7-2.5 parts of ultraviolet absorber, Antioxidant 0.05~2 parts; The composite crosslinking agent includes a first crosslinking agent and a second crosslinking agent in a mass ratio of (0.22~3.2):1; the first crosslinking agent is at least one of allyl isocyanurate crosslinking agents and allyl cyanurate crosslinking agents; the second crosslinking agent is at least one of vinyl crosslinking agents and acrylate crosslinking agents.

[0010] It should be noted that: In this invention, melamine cyanurate is added to polyamide resin as a flame retardant to improve the flame retardant properties of the material. To maintain good flame retardant properties and glow wire temperature after aging, the inventors attempted to add a crosslinking agent to achieve radiation crosslinking of the polyamide. However, they found that a single-component crosslinking agent could not maintain good flame retardant properties and glow wire temperature of the polyamide composite material after aging.

[0011] Through further research, the inventors of this invention discovered that when the first crosslinking agent undergoes crosslinking, it can integrate nitrogen-containing six-membered rings into the crosslinking network of polyamide, which helps to improve the flame retardant properties and glow wire temperature of the material after aging. However, the presence of melamine cyanurate hinders the crosslinking process during irradiation, resulting in insufficient crosslinking and a lack of significant improvement in the flame retardant properties and glow wire temperature after aging. In contrast, the second crosslinking agent has high crosslinking activity and can still achieve a high degree of crosslinking in the presence of melamine cyanurate. This high degree of crosslinking can alleviate the aging of the material. Therefore, the synergy between the two agents ensures that the flame retardant properties and glow wire temperature of the material remain good after aging.

[0012] The inventors of this invention have also discovered that adding light stabilizers and ultraviolet absorbers to the polyamide composite material of this invention can further improve the flame retardant properties and glow wire temperature of the polyamide composite material after aging.

[0013] In this invention, polyamide resin is used as the main resin, and its content accounts for at least 70 wt% of the polyamide composite material.

[0014] Preferably, the polyamide resin is at least one selected from PA 6, PA 66, PA 610, PA 612, PA 11, PA 12, PA 910, PA 912, PA 913, PA 914, PA 915, PA 916, PA 918, PA 936, PA 1010, PA 1012, PA 1013, PA 1014, PA 1210, PA 1212, PA 1213, PA 1214, PA 614, PA 613, PA 615, PA 616, PA 618, PAMXD10, PA 12T, PA 10T, PA 18T, PA 11 / 10T, and PA 11 / 6T. Preferably, the relative viscosity of the polyamide resin is 1.0 to 5.0; specifically, it can be 1.0, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 or 5.0, or any range formed by any two points.

[0015] In this invention, the relative viscosity of the polyamide resin can be measured using an Ubbelohde viscometer under conditions of 96% concentrated sulfuric acid and 23°C, according to ISO 307-2019.

[0016] Preferably, the melamine cyanurate in the polyamide composite material is 11.0 to 17.0% by mass.

[0017] Preferably, in the composite crosslinking agent, the mass ratio of the first crosslinking agent to the second crosslinking agent is (0.33~1):1. When the mass ratio of the first crosslinking agent to the second crosslinking agent is within this range, the resulting radiation-crosslinked polyamide composite material exhibits better flame retardant properties and a higher glow wire temperature after long-term photoaging.

[0018] Preferably, the light stabilizer is a hindered amine light stabilizer.

[0019] More preferably, the hindered amine light stabilizer is N,N-1,2-ethylenedimethylbis[N-[3-[[4,6-bis[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazin-2-yl]amino]propyl]-N,N-dibutyl-N,N-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazin-2,4,6-triamine, or N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine-morpholine-2,4,6-triamine. At least one of the following: methylated polymers of chloro-1,3,5-triazine; N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-phenylenediamide; N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-N,N'-dialdehyde hexanediamine; and copolymers of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine with 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine.

[0020] More preferably, the hindered amine light stabilizer has a pH value of 9 to 11.

[0021] More preferably, the pH value of the hindered amine light stabilizer is 9~10.5; by controlling the pH value of the hindered amine light stabilizer within this range, the obtained radiation crosslinked polyamide composite material exhibits better flame retardant properties after long-term photoaging.

[0022] Preferably, the light stabilizer in the polyamide composite material is 0.7% to 3.7% by mass.

[0023] Preferably, the ultraviolet absorber is at least one of benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, triazine ultraviolet absorbers, salicylates ultraviolet absorbers, and cyanoacrylate ultraviolet absorbers.

[0024] More preferably, the triazine light absorber is at least one of 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxyphenol, 2,4-bis(2,4-dihydroxyphenyl)-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4-bis(2,4-dihydroxyphenyl)-6-phenyl-1,3,5-triazine, 2-(2,4-dihydroxyphenyl)-4,6-diphenyl-1,3,5-triazine, and 2,4,6-tris(2,4-dihydroxyphenyl)-1,3,5-triazine.

[0025] Preferably, the mass percentage of the ultraviolet absorber in the polyamide composite material is 0.7-3.7%.

[0026] In this invention, the mass ratio of the first crosslinking agent and the second crosslinking agent can be 1:4, 1:2, 1:1, 2:1, 3:1, or any range formed by any two of the above points.

[0027] Preferably, the first crosslinking agent is triallyl isocyanurate; using triallyl isocyanurate as the first crosslinking agent, the radiation-crosslinked polyamide composite material prepared has better flame retardant properties and a higher glow wire temperature after long-term photoaging.

[0028] Preferably, the second crosslinking agent is a vinyl crosslinking agent; using a vinyl crosslinking agent as the second crosslinking agent results in a more significant synergistic effect with the first type of crosslinking agent, and the resulting radiation-crosslinked polyamide composite material exhibits better flame retardant properties and a higher glow wire temperature after long-term photoaging.

[0029] Preferably, the vinyl crosslinking agent is divinylbenzene; and / or The acrylate crosslinking agent is at least one of trimethylolpropane trimethacrylate and ethylene glycol dimethacrylate.

[0030] In this invention, the mass percentage of the composite crosslinking agent in the polyamide composite material is 1.0~7.3%.

[0031] Preferably, the radiation-crosslinked polyamide composite material further includes 1 to 10 parts of a flame retardant synergist.

[0032] Preferably, the antioxidant is at least one of an aromatic amine antioxidant, a hindered phenolic antioxidant, or a phosphite antioxidant.

[0033] More preferably, the aromatic amine antioxidant is one or two of 4,4'-bis(α(α(-dimethylbenzyl)diphenylamine (Naugard 445)) or 2,2,4-trimethyl-1,2-dihydroquinoline polymer (anti-aging agent TMQ).

[0034] More preferably, the hindered phenolic antioxidant is at least one of N,N'-hexamethylene bis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), pentaerythritol tetrakis[1093,5-di-tert-butyl-4-hydroxyphenyl)propionate, triethylene glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, octadecyl β-(4-hydroxy-3,5-di-tert-butylphenyl)propionate, and spiroethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate].

[0035] More preferably, the phosphite antioxidant is at least one of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,2-di-tert-butylphenyl) pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, and bis(2,4-dicumylphenyl) pentaerythritol diphosphite.

[0036] Preferably, the radiation-crosslinked polyamide composite material further includes 0-1 parts of other additives.

[0037] More preferably, the other additives include, but are not limited to, lubricants.

[0038] More preferably, the lubricant includes, but is not limited to, ethylene bis-stearamide.

[0039] The present invention also protects the preparation method of the above-mentioned radiation crosslinked polyamide composite material, which includes the following steps: mixing the components, melt extruding, granulating, and then subjecting to radiation treatment to obtain the polyamide composite material.

[0040] Preferably, the temperature of the melt extrusion is 200~320℃; the length-to-diameter ratio of the screw of the melt extrusion extruder is 30~100:1, and the screw speed is 200~500 r / min.

[0041] Preferably, the radiation treatment uses beta rays or gamma rays.

[0042] Preferably, the radiation dose of the radiation treatment is 40 MRad, and the radiation time is 60 min.

[0043] This invention also protects the application of the above-mentioned radiation-crosslinked polyamide composite material in the preparation of automotive parts, electronic and electrical parts, outdoor equipment parts, robot parts, or robot dog parts.

[0044] This invention also protects an injection-molded part prepared by the above-described preparation method.

[0045] Preferably, the injection-molded part is at least one of automotive parts, electronic and electrical parts or outdoor equipment parts, humanoid robot parts, and robot dog parts.

[0046] More preferably, the automotive component is at least one of engine peripheral parts, connectors, and charging pile housings. More preferably, the electronic and electrical components are at least one of a 5G base station housing, a power adapter, and a circuit breaker.

[0047] More preferably, the robot component is at least one of a humanoid robot component, an industrial robot component, a service industry robot component, and a firefighting robot component.

[0048] More preferably, the outdoor equipment component is at least one of a solar panel bracket, an LED lighting housing, and a security device.

[0049] Compared with the prior art, the beneficial effects of the present invention are: This invention involves adding a specific composite crosslinking agent to a polyamide resin containing melamine cyanurate flame retardant, and then using a radiation method to crosslink the polyamide resin. This results in a radiation-crosslinked polyamide composite material that maintains good flame retardant properties and a high glow wire temperature even after long-term photoaging. Detailed Implementation

[0050] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0051] Unless otherwise specified, all reagents and materials used in the following examples are commercially available.

[0052] To more clearly and completely describe the technical solution of the present invention, the present invention will be further described in detail below through specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. Various changes can be made within the scope of the claims of the present invention.

[0053] The reagents used in the various embodiments and comparative examples of this invention are described below: Polyamide resin #1: PA6, LX245, Luxi Chemical, relative viscosity 2.4; Polyamide resin #2: PA6, BL3280, Baling Petrochemical, relative viscosity 2.8; Polyamide resin #3: PA66, T37, Huafeng, relative viscosity 3.7; Melamine cyanurate 1#: MC60-A, Shouguang Puer Chemical; Melamine cyanurate 2#: MCA-10, Sichuan Fine Chemical Research Institute; Allyl isocyanurate crosslinking agents: Triallyl isocyanurate (TAIC), Hefei Anbang Chemical Co., Ltd. Allyl cyanate crosslinking agent: Triallyl cyanate (TAC), Hefei Anbang Chemical; Vinyl crosslinking agent: Divinylbenzene (DVB), Jiangsu Changxin New Materials; Acrylic crosslinking agents: Trimethylolpropane trimethacrylate (TMPTMA), ALLNEX; Composite crosslinking agent 1#: It is obtained by mixing allyl isocyanurate crosslinking agent and vinyl crosslinking agent in a mass ratio of 1:1; Composite crosslinking agent 2#: It is obtained by mixing allyl isocyanurate crosslinking agent and acrylate crosslinking agent in a mass ratio of 1:1; Composite crosslinking agent #3: It is obtained by mixing allyl cyanurate crosslinking agent and vinyl crosslinking agent in a mass ratio of 1:1; Composite crosslinking agent #4: It is obtained by mixing allyl isocyanurate crosslinking agent and vinyl crosslinking agent in a mass ratio of 1:4; Composite crosslinking agent 5#: It is obtained by mixing allyl isocyanurate crosslinking agent and vinyl crosslinking agent in a mass ratio of 3:1; Hindered amine light stabilizer 1#: CHIMASSORB 2020, BASF, a copolymer of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine with 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinylamine, pH 10; Hindered amine light stabilizer #2: Chiguard 4050, N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-N,N'-dialdehyde hexamethylenediamine, Qitai Technology, pH 10.5; Hindered amine light stabilizer 3#: UV-3529, Milan Chemical, a methylated polymer of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and morpholine-2,4,6-trichloro-1,3,5-triazine, pH 9; Hindered amine light stabilizer #4: Chiguard 5050, C 20~24 The reaction product of α-olefins, maleic anhydride polymers and 2,2,6,6-tetramethyl-4-piperidinamine, Qitai Technology, pH 11; The pH of the hindered amine light stabilizer was determined by potentiometric titration. The specific test method was as follows: 0.01 g of the hindered amine light stabilizer was dissolved in 100 mL of a mixed solvent of isopropanol and distilled water (volume ratio of isopropanol and distilled water was 50:50) to prepare the test solution, and then titrated with HCl standard solution (0.1 mol / L) to determine the pH.

[0054] Triazine light absorber: DSUNSORB 1577, Disheng Technology, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol; Benzotriazole light absorbers: Tinuvin 234, BASF; Antioxidant: IRGANOX 1098, an antioxidant, commercially available; Other additives #1: Ethylene bis-stearamide, lubricant, commercially available; Unless otherwise specified, all components used in the parallel embodiments and comparative examples are the same commercially available products.

[0055] The polyamide composite materials of the embodiments and comparative examples of the present invention were prepared by the following preparation method: (1) Weigh each component according to the proportion, put each component into a high-speed mixer, mix evenly to obtain a mixture; (2) The mixture is fed into a twin-screw extruder. The extruder temperature is set to 200~270℃ (if the PA resin is PA6 resin, the temperatures of each zone are: 200℃, 210℃, 220℃, 230℃, 230℃, 240℃, 240℃, 250℃, 260℃; if the PA resin is PA66 resin, the temperatures of each zone are: 230℃, 240℃, 240℃, 240℃, 250℃, 250℃, 250℃, 260℃, 270℃). The rotation speed is 400r / min and the screw length-to-diameter ratio is 40:1. After mixing, melting, homogenizing and extruding granulation, the polyamide composite material to be crosslinked is obtained.

[0056] (3) The polyamide composite material to be crosslinked is sent into the irradiation chamber for irradiation treatment. The radiation dose of the irradiation treatment is 40 MRad and the irradiation time is 60 min.

[0057] Examples 1-12 Examples 1-12 provide a series of polyamide composite materials, the formulations of which are shown in Table 1.

[0058] Table 1. Formulations (parts by weight) of the Examples

[0059] Continued from Table 1. Formulations (parts by weight) for the Examples

[0060] Comparative Examples 1-5 Comparative Examples 1-5 provide a series of polyamide composite materials, the formulations of which are shown in Table 3.

[0061] Table 2 Formulations (parts by weight) for Comparative Examples 1-5

[0062] Sample performance testing (1) Flame retardancy test: 1.6mm UL94 vertical burning test strips were obtained by injection molding of the polyamide composite materials of each embodiment and comparative example, and divided into group A and group B. Group A was tested for flame retardancy according to the UL94 (2023) V-0 test standard; Group B was subjected to 1000 hours of ultraviolet aging according to the ISO-4892-3:2024 standard. After aging, the flame retardancy was tested according to the UL94 (2023) V-0 test standard. The flame retardancy test method is as follows: Aim the Bunsen burner flame at the center of the lower end of the sample, maintaining a distance of 10±1 mm between the center of the top surface of the Bunsen burner and the lower end of the sample. Maintain this distance for 10±0.5 s. If necessary, move the Bunsen burner according to the length of the sample. After applying the flame for 10±0.5 s, immediately withdraw the Bunsen burner at a speed of approximately 300 mm / s to a distance of at least 150 mm from the sample. Simultaneously, use a timing device to measure the flaming combustion time T1 (in seconds). After the flaming combustion stops, immediately move the Bunsen burner to a distance of 10±1 mm from the lower end of the sample and apply the flame again for 10±0.5 s. If necessary, remove the Bunsen burner to remove any drippings. Immediately after applying the flame, withdraw the Bunsen burner from the sample to a distance of at least 150 mm. Simultaneously, start the timing device to measure the flaming time T2 and the flameless combustion time T3, and record T2 and T3. Perform the above test in 5 parallel trials, and record the sum of the total combustion times T1+T2+T3 from the 5 trials. If the sum of T1+T2+T3 values ​​from the five trials is less than 50s, and no dripping ignites the cotton below, then the V-0 condition is considered to be met.

[0063] (2) Glow wire ignition temperature (GWIT): The polyamide composite materials of each embodiment and comparative example were injection molded to obtain 60mm×60mm×2mm square plates, which were divided into group A and group B; among them, group B was subjected to ISO-4892-3 ultraviolet aging for 1000 hours. According to IEC 60695-2-13 standard, an electrically heated glow wire was used as the ignition source to conduct glow wire ignition temperature tests on the group A samples of each embodiment and comparative example and the aged group B samples, and the initial GWIT and the aged GWIT were obtained respectively.

[0064] The properties of the polyamide composites in each embodiment and comparative example were determined according to the test methods mentioned above, and the test results are shown in Table 3.

[0065] Table 3. Performance test results of polyamide composite materials in each example and comparative example.

[0066] As can be seen from the test results in Table 3, the total burning time of the polyamide composite materials in each embodiment before and after aging is no more than 40s, the flame retardant rating before and after aging is V-0, and the glow wire temperature after aging is no less than 775℃. This indicates that the polyamide composite material of the present invention maintains a high level of flame retardant performance and glow wire temperature after long-term ultraviolet aging.

[0067] Comparative Example 1 did not add any crosslinking agent, and Comparative Examples 2 and 5 did not add the second crosslinking agent specific to this invention, resulting in a decrease in the flame retardancy rating and a significant decrease in the glow wire temperature of the polyamide composite materials prepared in the above comparative examples after aging; the obtained polyamide composite materials decreased in flame retardancy rating and a significant decrease in the glow wire temperature after aging; Comparative Examples 3 and 4 did not add the first crosslinking agent specific to this invention, resulting in a decrease in the flame retardancy rating of the polyamide composite materials prepared in the above comparative examples after aging.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A radiation-crosslinked polyamide composite material, characterized in that, The components comprise the following parts by weight: 50-70 parts of polyamide resin, 8-15 parts of melamine cyanurate 0.5-5 parts of composite crosslinking agent, Light stabilizer 0.7~2.5 parts, 0.7-2.5 parts of ultraviolet absorber, Antioxidant 0.05~2 parts; The composite crosslinking agent includes a first crosslinking agent and a second crosslinking agent in a mass ratio of (0.22~3.2):1; the first crosslinking agent is at least one of allyl isocyanurate crosslinking agents and allyl cyanurate crosslinking agents; the second crosslinking agent is at least one of vinyl crosslinking agents and acrylate crosslinking agents.

2. The radiation-crosslinked polyamide composite material according to claim 1, characterized in that, The relative viscosity of the polyamide resin is 1.0~5.

0.

3. The radiation-crosslinked polyamide composite material according to claim 1, characterized in that, The light stabilizer is a hindered amine light stabilizer.

4. The radiation-crosslinked polyamide composite material according to claim 3, characterized in that, The hindered amine light stabilizer has a pH value of 9-11.

5. The radiation-crosslinked polyamide composite material according to claim 1, characterized in that, The ultraviolet absorber is at least one of benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, triazine-based ultraviolet absorbers, salicylates-based ultraviolet absorbers, and cyanoacrylate-based ultraviolet absorbers.

6. The polyamide composite material according to claim 1, characterized in that, The first crosslinking agent is triallyl isocyanurate.

7. The polyamide composite material according to claim 1, characterized in that, The vinyl crosslinking agent is divinylbenzene; and / or The acrylate crosslinking agent is at least one of trimethylolpropane trimethacrylate and ethylene glycol dimethacrylate.

8. A method for preparing the radiation-crosslinked polyamide composite material according to any one of claims 1 to 7, characterized in that, The process includes the following steps: mixing the components, melt extruding, granulating, and then subjecting to radiation treatment to obtain the polyamide composite material.

9. The application of the radiation-crosslinked polyamide composite material according to any one of claims 1 to 7 in the preparation of automotive parts, electronic and electrical parts, outdoor equipment parts, humanoid robot parts or robot dog parts.

10. An injection-molded part, characterized in that, It is obtained by processing the radiation-crosslinked polyamide composite material according to any one of claims 1 to 7.

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