A nylon material and its preparation method and application

Abstract

The present invention provides a nylon material, a preparation method thereof, and an application thereof. The nylon material comprises the following components, measured by weight: 27-76 parts of nylon resin; 2-11 parts of polycarbonate; 9-41 parts of chopped carbon fibers; 4-26 parts of conductive carbon black; and 0.5-5.5 parts of carbon nanotubes. The nylon resin has a terminal amino group content of 47-85 mmol / kg; the surface of the chopped carbon fibers is coated with a polyurethane surface treatment agent; and the pH value of the conductive carbon black is 6-8. The present invention modifies the nylon resin by compounding chopped carbon fibers, conductive carbon black, and carbon nanotubes, and controls the terminal amino group content of the nylon resin, the type of the chopped carbon fiber surface treatment agent, and the pH value of the conductive carbon black, so that the resulting nylon material has good electromagnetic shielding effect and mechanical properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering plastics, and relates to a nylon material, a preparation method and an application thereof, and in particular to a high-grade electromagnetic shielding nylon material, a preparation method and an application thereof. Background Art

[0002] Currently, due to the widespread use of electronic and electrical equipment and the widespread application of wireless transmission technology, the electromagnetic waves generated by electronic devices not only interact with other electronic devices, causing electronic interference, but also cause damage to people and the environment. Currently, electromagnetic shielding materials are generally used to protect electronic devices.

[0003] Currently common electromagnetic shielding materials are mainly divided into:

[0004] (1) Metal materials. Metal is a traditional electromagnetic shielding material and is widely used because of its excellent electrical conductivity and high magnetic permeability.

[0005] (2) Intrinsic conductive polymers: Polyaniline, polyacetylene, polypyrrole and other polymer materials containing large conjugated π electron systems.

[0006] (3) Composite conductive materials: By modifying thermoplastic or thermosetting materials through physical blending, they can achieve higher electromagnetic shielding effectiveness.

[0007] Obviously, composite conductive materials are more economical than the first two methods.

[0008] CN101812214A adds conductive fillers such as conductive carbon black, carbon fiber, and magnetic powder to ABS resin, so that the composite material has a certain electromagnetic shielding effectiveness, but its shielding effectiveness is poor, the electromagnetic shielding effectiveness is less than 30dB, and the electromagnetic shielding performance is poor.

[0009] CN109504076A adds a certain proportion of carbon fiber and polythiophene conductive powder to nylon alloy, achieving a certain synergistic effect and making certain explorations in improving electromagnetic shielding, but its resistance value is still relatively high and cannot achieve a high-level electromagnetic shielding effect.

[0010] Moreover, for composite conductive materials, regardless of the type of conductive filler, a higher proportion is often required to be added, and the surface activity of the conductive filler is often low and the compatibility with the matrix resin is poor. Therefore, the mechanical properties and processing properties of the composite material are often poor and cannot meet the use requirements of downstream industries.

[0011] Therefore, it is desired in the art to develop an electromagnetic shielding material that can maintain a high level of electromagnetic shielding effectiveness without sacrificing the mechanical properties and processing properties of the material. Summary of the Invention

[0012] To address the shortcomings of the prior art, the present invention provides a nylon material, its preparation method, and its application. This invention modifies thermoplastic nylon material with conductive fillers such as carbon fibers, carbon black, and carbon nanotubes, and controls relevant parameters to achieve excellent electromagnetic shielding effectiveness, effectively protecting against electromagnetic interference generated by electronic and electrical equipment.

[0013] To achieve this object, the present invention adopts the following technical solutions:

[0014] In a first aspect, the present invention provides a nylon material, comprising the following components in parts by weight:

[0015]

[0016] The terminal amino content of the nylon resin is 47-85 mmol / kg, for example, 47 mmol / kg, 50 mmol / kg, 53 mmol / kg, 55 mmol / kg, 58 mmol / kg, 60 mmol / kg, 63 mmol / kg, 65 mmol / kg, 68 mmol / kg, 70 mmol / kg, 73 mmol / kg, 75 mmol / kg, 78 mmol / kg, 80 mmol / kg, 83 mmol / kg, 85 mmol / kg, etc.;

[0017] The surface of the chopped carbon fibers is coated with a polyurethane surface treatment agent;

[0018] The pH value of the conductive carbon black is 6-8, for example, 6, 6.2, 6.4, 6.6, 6.8, 7, 7.2, 7.4, 7.6, 7.8, 8, etc.

[0019] The present invention modifies nylon resin by combining chopped carbon fibers, conductive carbon black, and carbon nanotubes. By controlling the amino group content of the nylon resin, the type of surface treatment agent for the chopped carbon fibers, and the pH value of the conductive carbon black, the resulting nylon material exhibits excellent electromagnetic shielding and mechanical properties. By adding a small amount of polycarbonate (PC), the PC is partially degraded by the amino groups of the nylon resin, which helps improve the dispersion and distribution of the conductive carbon black and carbon nanotubes in the resin matrix, further enhancing the material's mechanical properties.

[0020] If the terminal amino group content of the nylon resin is too low, the compatibility of the nylon resin with other components will deteriorate, which is not conducive to the dispersion of the conductive filler. If the terminal amino group content of the nylon resin is too high, the polycarbonate will decompose violently, making it difficult to process and further deteriorating the mechanical properties.

[0021] Chopped carbon fibers with a polyurethane surface coating are beneficial for the winding distribution of carbon nanotubes on the carbon fiber surface, thereby enhancing the formation of a conductive network.

[0022] The pH value of conductive carbon black will directly affect its dispersion in the resin matrix and the degree of degradation of nylon resin and polycarbonate.

[0023] The use of carbon black and carbon nanotube powder fillers can improve the conductive stability of nylon materials and help further improve their electromagnetic shielding performance.

[0024] In the present invention, the nylon material is calculated in parts by weight, and the amount of nylon resin used can be 27 parts, 28 parts, 30 parts, 33 parts, 35 parts, 38 parts, 40 parts, 43 parts, 45 parts, 48 ​​parts, 50 parts, 53 parts, 55 parts, 58 parts, 60 parts, 63 parts, 65 parts, 68 parts, 70 parts, 73 parts, 75 parts, 76 parts, etc.

[0025] In the present invention, the amount of the nylon material and the polycarbonate can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, etc., calculated by weight.

[0026] In the present invention, the amount of the nylon material and the chopped carbon fiber can be 9 parts, 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, 23 parts, 25 parts, 28 parts, 30 parts, 33 parts, 35 parts, 38 parts, 40 parts, 41 parts, etc., calculated by weight.

[0027] In the present invention, the amount of conductive carbon black in the nylon material can be 4 parts, 5 parts, 8 parts, 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, 23 parts, 25 parts, 25 parts, 26 parts, etc., calculated by weight.

[0028] In the present invention, the amount of carbon nanotubes in the nylon material can be 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, etc. In the nylon material, the content of nylon resin is preferably not less than 25wt%.

[0029] Preferably, the polyurethane surface treatment agent accounts for 1%-5% of the weight of the chopped carbon fiber, for example, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2%, 2.2%, 2.4%, 2.5%, 2.6%, 2.8%, 3%, 3.2%, 3.4%, 3.5%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.5%, 4.6%, 4.8%, 5%, etc., preferably 2%-4%; that is, the chopped carbon fiber The carbon content is 95%-99%, for example 95%, 95.2%, 95.4%, 95.5%, 95.6%, 95.8%, 96%, 96.2%, 96.4%, 96.5%, 96.6%, 96.8%, 97%, 97.2%, 97.4%, 97.5%, 97.6%, 97.8%, 98%, 98.2%, 98.4%, 98.5%, 98.6%, 98.8%, 99%, etc., preferably 96%-98%.

[0030] Preferably, the nylon resin includes PA66.

[0031] Preferably, the polycarbonate has a melt flow rate at 300° C. and 1.2 kg of 20-30 g / 10 min, for example, 20 g / 10 min, 22 g / 10 min, 24 g / 10 min, 26 g / 10 min, 28 g / 10 min, 30 g / 10 min, etc.

[0032] Preferably, the polycarbonate includes bisphenol A polycarbonate and / or aliphatic polycarbonate.

[0033] Preferably, the diameter of the chopped carbon fibers is 6-8 μm, for example, 6 μm, 7 μm, 8 μm, etc. In the present invention, the diameter of the chopped carbon fibers is measured as follows: Fibers approximately 1 mm in length are cut from the fibers to be tested, placed under a microscope, and the width of each fiber is measured. The width between the two edges of the fiber is the diameter. The average value of 10 fibers is measured.

[0034] Preferably, the length of the chopped carbon fibers is 5-7 mm, for example, 5 mm, 6 mm, 7 mm, etc. In the present invention, the length of the chopped carbon fibers is measured by using a vernier caliper, and the average value of 20 fibers is obtained.

[0035] Preferably, the conductive carbon black comprises furnace carbon black. The carbon black having the pH value of the present invention can be obtained by self-production, commercial products, or commercial carbon black treated with an acid-base reagent, wherein the acid-base reagent comprises sodium bicarbonate.

[0036] Preferably, the oil absorption value of the conductive carbon black is 140-150mL / 100g, for example, 140mL / 100g, 141mL / 100g, 142mL / 100g, 143mL / 100g, 144mL / 100g, 145mL / 100g, 146mL / 100g, 147mL / 100g, 148mL / 100g, 149mL / 100g, 150mL / 100g, etc. In the present invention, the oil absorption value of conductive carbon black is tested as follows: referring to ASTM D-2414, 0.5 g of carbon black is taken, an appropriate amount of dibutyl phthalate (hereinafter referred to as DBP) is poured into a burette, the burette scale is adjusted to zero, the carbon black is poured onto a glass plate, DBP is dripped onto the carbon black at a uniform rate, and a glass rod is used to continuously stir and roll the mixture. When the mixture of carbon black and DBP has a characteristic shape (hard carbon black and pigment carbon black appear in thin strips, soft carbon black appears in small blocks, and there is no fine powder or granular carbon black), all the carbon black is rolled onto the glass rod, and no oil marks appear on the glass plate, which is the end point.

[0037] Oil absorption value = DBP consumption (unit: mL) ÷ carbon black mass g (0.5 g in the above experiment) x 100. Preferably, the carbon nanotubes include multi-walled carbon nanotubes.

[0038] Preferably, the specific surface area of ​​the carbon nanotubes is 240-300 m 2 / g, for example 240m 2 / g, 250m 2 / g, 260m 2 / g, 270m 2 / g, 280m 2 / g, 290m 2 / g、300m 2 / g, etc.

[0039] Preferably, the diameter of the carbon nanotube is 10-20 nm, for example, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm, 20 nm, etc. In the present invention, the method for testing the diameter of the carbon nanotube is as follows: with reference to GB / T26826-2011, the diameter of the carbon nanotube is measured using a transmission electron microscope. First, the sample is prepared into a uniformly dispersed solution and then dropped onto a copper mesh. Next, the copper mesh is placed under the electron beam path of a TEM, and the electron beam is passed through the sample to obtain a transmission image of the carbon nanotube. Finally, the diameter of the carbon nanotube (i.e., the diameter of the carbon nanotube) is measured according to the scale in the image.

[0040] Preferably, the length of the carbon nanotubes is 20-50 μm, for example, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc. In the present invention, the length of the carbon nanotubes is measured as follows: the carbon nanotube sample is dispersed in a solution, dropped onto a conductive substrate, and then dried. The dried conductive substrate is then placed in a SEM, the electron beam parameters are adjusted, and a suitable magnification is selected. By observing the SEM image, the length of the carbon nanotubes can be measured.

[0041] Preferably, the mass ratio of the conductive carbon black to the carbon nanotubes is (5-10):1, for example, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, etc.

[0042] Preferably, the nylon material further comprises 2-11 parts (e.g., 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, etc.) of additives.

[0043] Preferably, the additive comprises any one of a compatibilizer, an acid scavenger, an antioxidant or a lubricant, or a combination of at least two thereof.

[0044] Preferably, the additives include 1-5 parts of a compatibilizer (e.g., 1 part, 2 parts, 3 parts, 4 parts, 5 parts, etc.), 1-3 parts of an acid scavenger (e.g., 1 part, 2 parts, 3 parts, etc.), 0.1-1 part of an antioxidant (e.g., 0.1 part, 0.2 parts, 0.3 parts, 0.5 parts, 0.6 parts, 0.8 parts, 1 part, etc.), and 0.1-1 part of a lubricant (e.g., 0.1 part, 0.2 parts, 0.3 parts, 0.5 parts, 0.6 parts, 0.8 parts, 1 part, etc.).

[0045] Preferably, the compatibilizer includes any one or a combination of at least two of maleic anhydride grafted polypropylene, maleic anhydride grafted ethylene-octene copolymer, maleic anhydride grafted ethylene-propylene-butadiene copolymer or maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer.

[0046] Preferably, the acid scavenger comprises magnesium hydroxide.

[0047] Preferably, the average particle size of the magnesium hydroxide is 2-4 μm, for example, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, etc. In the present invention, the average particle size of the magnesium hydroxide is obtained by testing by the following method: ultrasonically dispersing the magnesium hydroxide using distilled water as a dispersant, and then measuring the average particle size using a laser particle size analyzer after dispersion.

[0048] Preferably, the antioxidant includes any one of 2,4,6-tri-tert-butylphenol, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(nonylphenyl)phosphite or tris(2,4-di-tert-butylphenyl)phosphite, or a combination of at least two thereof.

[0049] Preferably, the lubricant comprises any one of N,N'-ethylenebisstearamide, octadecanoic acid, stearate or erucamide, or a combination of at least two thereof.

[0050] Preferably, the stearate comprises calcium stearate.

[0051] As a preferred technical solution of the present invention, the nylon material comprises the following components in parts by weight:

[0052]

[0053] In a second aspect, the present invention provides a method for preparing the nylon material according to the first aspect, the method comprising the following steps:

[0054] The nylon resin, polycarbonate, carbon nanotubes and optional additives in a formulated amount are mixed, and the mixed materials are fed into a twin-screw extruder from a main feed port, conductive carbon black is fed into the twin-screw extruder from a first side feed port, and short-cut carbon fibers are fed into the twin-screw extruder from a second side feed port. After extrusion, cooling and granulation, the nylon material is obtained.

[0055] Preferably, the feed port temperature of the twin-screw extruder is 80-100°C, such as 80°C, 85°C, 90°C, 95°C, 100°C, etc.

[0056] Preferably, the temperature of each zone of the barrel of the twin-screw extruder is maintained in the range of 220-320°C (e.g., 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C, 310°C, 320°C, etc.).

[0057] In a third aspect, the present invention provides an application of the nylon material described in the first aspect in an automotive three-electric system, an industrial equipment housing, and a 5G base station.

[0058] Compared with the prior art, the present invention has at least the following beneficial effects:

[0059] The present invention modifies nylon resin by combining chopped carbon fibers, conductive carbon black, and carbon nanotubes. By controlling the amino group content of the nylon resin, the type of surface treatment agent for the chopped carbon fibers, and the pH value of the conductive carbon black, the resulting nylon material exhibits excellent electromagnetic shielding and mechanical properties. By adding a small amount of polycarbonate (PC), the PC is partially degraded by the amino groups of the nylon resin, which helps improve the dispersion and distribution of the conductive carbon black and carbon nanotubes in the resin matrix, further enhancing the material's mechanical properties. DETAILED DESCRIPTION

[0060] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0061] The specific raw materials used in the examples and comparative examples of the present invention, their brands and manufacturers are shown in Table 1.

[0062] Table 1

[0063]

[0064]

[0065] Among them, the test methods for some raw material parameters are as follows:

[0066] (1) The amino group content of nylon resin was tested using potentiometric titration method A, referring to GBT 38138-2019.

[0067] (2) Melt flow rate of polycarbonate: Reference standard ISO 1133-1-2022, test conditions: 300°C, 1.2 kg.

[0068] (3) Carbon content of carbon fiber: The test was performed using a thermogravimetric analyzer. 5-10 mg of carbon fiber was taken and heated to 750°C under nitrogen protection. The temperature was kept constant at 750°C for 30 min. The residual weight percentage was the carbon content.

[0069] (4) Carbon black pH: About 5 g of carbon black sample was placed in a 100 mL beaker, 40 mL of distilled water and 10 mL of 95% ethanol aqueous solution were added, and the mixture was stirred with a glass rod for 10 minutes to completely disperse the carbon black. The sample solution was filtered with filter paper to remove undispersed carbon black particles, and the pH value of the filtrate was tested using a pH meter.

[0070] Methods for adjusting the pH value of carbon black:

[0071] 500g of carbon black (carbon black #4 above) was placed in a high-speed blender. A 0.1 mol / L sodium bicarbonate aqueous solution was added and stirred in the blender to obtain carbon black containing a certain amount of moisture. The carbon black was then dried at 120°C to maintain a moisture content below 1%. Finally, the pH value of the obtained carbon black was tested using the carbon black pH test described above.

[0072] (5) Specific surface area of ​​carbon nanotubes: with reference to standard GBT-10722-2014, the test was performed using a BET surface area analyzer.

[0073] Example 1

[0074] In this embodiment, a nylon material is provided. The specific components and usage (parts by weight) of the nylon material are shown in Table 2.

[0075] The preparation method comprises the following steps:

[0076] According to the formula in Table 2, nylon resin, polycarbonate, carbon nanotubes, and additives were mixed, and the mixed materials were fed into a twin-screw extruder from a main feed port, conductive carbon black was fed into the twin-screw extruder from a first side feed port, and chopped carbon fibers were fed into the twin-screw extruder from a second side feed port. After extrusion, cooling, and granulation, the nylon material was obtained.

[0077] Among them, the feed port temperature of the twin-screw extruder is 80℃, and the temperatures of screw zones 1-11 are 220℃, 250℃, 250℃, 250℃, 250℃, 260℃, 270℃, 280℃, 250℃, 250℃, and 300℃ respectively.

[0078] Examples 2-15, Comparative Examples 1-6

[0079] An electromagnetic shielding nylon material is provided in Examples 2-15 and Comparative Examples 1-6, respectively. The difference from Example 1 is that the formula of the electromagnetic shielding nylon material is different, as shown in Tables 2 and 3; wherein, “--” represents that the component is not added; the preparation method of the electromagnetic shielding nylon material is the same as that in Example 1.

[0080] The electromagnetic shielding nylon materials provided in the examples and comparative examples were subjected to performance tests, and the test methods were as follows:

[0081] (1) Notched impact strength test: According to ISO 180, the material is injection molded into a specimen with an A-type notch, and its Izod notched impact strength is tested;

[0082] (2) Electromagnetic shielding performance test: The electromagnetic shielding nylon material was injection molded into a 150*150*2mm square plate. The electromagnetic shielding effectiveness of the square plate was tested in the frequency range of 0.5 to 2 GHz according to the flange coaxial device test method of GB / T30142-2013.

[0083] The performance test results are shown in Table 2 and Table 3.

[0084] Table 2

[0085]

[0086]

[0087] Table 3

[0088]

[0089] It can be seen from Table 2 and Table 3 that the electromagnetic shielding nylon materials provided by the embodiments of the present invention have relatively high notched impact strength (8-18.5 kJ / m 2 ) and electromagnetic shielding effectiveness (43-72dB).

[0090] Compared with Example 10, the notched impact strength and electromagnetic shielding effectiveness of the electromagnetic shielding nylon material provided by Comparative Examples 1-2 are significantly reduced.

[0091] Compared with Example 10, the notched impact strength of the electromagnetic shielding nylon material provided by Comparative Examples 3-4 is significantly reduced, and the electromagnetic shielding effectiveness is reduced; the notched impact strength and electromagnetic shielding effectiveness of the electromagnetic shielding nylon material provided by Comparative Example 5 are both significantly reduced; the notched impact strength of the electromagnetic shielding nylon material provided by Comparative Example 6 is reduced, and the electromagnetic shielding effectiveness is significantly reduced.

[0092] The applicant states that while the above-described embodiments illustrate the nylon material, preparation method, and application of the present invention, the present invention is not limited to these embodiments, nor does it necessarily rely on these embodiments for implementation. Those skilled in the art will appreciate that any improvements to the present invention, equivalent substitutions for raw materials in the present invention, addition of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A nylon material, characterized in that: The nylon material comprises the following components in parts by weight: 27-76 parts of nylon resin; 2-11 parts of polycarbonate; 10-40 parts of chopped carbon fiber; 4-26 parts of conductive carbon black; 0.5-5.5 parts of carbon nanotubes; The terminal amino group content of the nylon resin is 47-85 mmol / kg; The surface of the chopped carbon fibers is coated with a polyurethane surface treatment agent; The pH value of the conductive carbon black is 6-8; The testing method for the pH value of the conductive carbon black comprises the following steps: Take 5 grams of carbon black sample and put it into a 100 ml beaker, add 40 ml of distilled water and 10 ml of 95% ethanol aqueous solution and stir with a glass rod for 10 minutes to completely disperse the carbon black. Filter the sample solution with filter paper to remove undispersed carbon black particles, and test the pH value of the filtrate with a pH meter.

2. The nylon material according to claim 1, characterized in that The polyurethane surface treatment agent accounts for 1%-5% of the weight of the chopped carbon fibers.

3. The nylon material according to claim 2, characterized in that The polyurethane surface treatment agent accounts for 2%-4% of the weight of the chopped carbon fibers.

4. The nylon material according to claim 1, characterized in that The nylon resin includes PA66.

5. The nylon material according to claim 1, characterized in that The polycarbonate has a melt flow rate of 20-30 g / 10 min at 300° C. and 1.2 kg.

6. The nylon material according to claim 1, characterized in that The conductive carbon black includes furnace black.

7. The nylon material according to claim 1, characterized in that The carbon nanotubes include multi-walled carbon nanotubes.

8. The nylon material according to claim 1, characterized in that The specific surface area of ​​the carbon nanotubes is 240-300 m 2 / g.

9. The nylon material according to claim 1, characterized in that The mass ratio of the conductive carbon black to the carbon nanotubes is (5-10):

1.

10. The nylon material according to claim 1, characterized in that The nylon material further comprises 2-11 parts of additives.

11. The nylon material according to claim 10, characterized in that: The additives include any one of a compatibilizer, an acid scavenger, an antioxidant or a lubricant, or a combination of at least two of them.

12. The nylon material according to claim 11, characterized in that The additives include 1-5 parts of a compatibilizer, 1-3 parts of an acid scavenger, 0.1-1 parts of an antioxidant, and 0.1-1 parts of a lubricant.

13. The nylon material according to claim 11, characterized in that The compatibilizer includes any one or a combination of at least two of maleic anhydride grafted polypropylene, maleic anhydride grafted ethylene-octene copolymer, maleic anhydride grafted ethylene-propylene-butadiene copolymer or maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer.

14. The nylon material according to claim 11, characterized in that The acid scavenger includes magnesium hydroxide.

15. The nylon material according to claim 14, characterized in that The average particle size of the magnesium hydroxide is 2-4 μm.

16. The nylon material according to claim 11, characterized in that The antioxidant includes any one of 2,4,6-tri-tert-butylphenol, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] or tris(2,4-di-tert-butylphenyl) phosphite or a combination of at least two thereof.

17. The nylon material according to claim 11, characterized in that The lubricant includes any one of N,N'-ethylenebisstearamide, octadecanoic acid, stearate or erucamide, or a combination of at least two thereof.

18. The nylon material according to claim 1, characterized in that The nylon material comprises the following components in parts by weight: 35-60 parts of nylon resin; 4-8 parts of polycarbonate; 15-35 parts of chopped carbon fiber; Conductive carbon black 10-20 parts; 1-3 parts of carbon nanotubes; 1-5 parts of compatibilizer; 1-3 parts of acid absorbent; 0.1-1 part of antioxidant; Lubricant 0.1-1 part.

19. A method for preparing the nylon material according to any one of claims 1 to 18, characterized in that: The preparation method comprises the following steps: The nylon resin, polycarbonate, carbon nanotubes and optional additives in a formulated amount are mixed, and the mixed materials are fed into a twin-screw extruder from a main feed port, conductive carbon black is fed into the twin-screw extruder from a first side feed port, and short-cut carbon fibers are fed into the twin-screw extruder from a second side feed port. After extrusion, cooling and granulation, the nylon material is obtained.

20. The preparation method according to claim 19, characterized in that The feed port temperature of the twin-screw extruder is 80-100°C.

21. The preparation method according to claim 19, characterized in that The temperature of each zone of the barrel of the twin-screw extruder is maintained in the range of 220-320°C.

22. Use of the nylon material according to any one of claims 1 to 18 in an automotive three-electric system, an industrial equipment housing, or a 5G base station.

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