Halogen-free flame-retardant nylon material as well as preparation method and application thereof

Abstract

The invention provides a halogen-free flame-retardant nylon material as well as a preparation method and application thereof. The halogen-free flame-retardant nylon material comprises the following components in parts by weight: 6-61 parts of polyamide resin A, 8-15 parts of a red phosphorus flame retardant, 1-5 parts of a melamine derivative and 20-50 parts of glass fibers, the polyamide resin A is semi-aromatic polyamide resin, and the melamine derivative comprises a combination of a melamine salt and a melamine condensate. The halogen-free flame-retardant nylon material provided by the invention is excellent in mechanical property and good in flame retardant property, and the ignition temperature of a glowing filament is greater than or equal to 775 DEG C.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials, and specifically relates to a halogen-free flame-retardant nylon material and a preparation method and application thereof. Background Art

[0002] In the electrical and electronic industry, the flame retardant performance requirements for household appliance plastic parts are very strict, and high requirements are placed on the glow-wire performance of the material. IEC60335 clearly stipulates the glow-wire performance of materials for high-current household appliances in unattended conditions. The core requirement is that the glow-wire ignition temperature (GWIT) must reach ≥775°C, which means that the material must not ignite at least 750°C or extinguish within 5 seconds at the test thickness.

[0003] From the flame retardant mechanism of different types of flame retardants and the failure mechanism of the glow-wire test, bromine-based flame retardants are mainly characterized by gas phase flame retardancy, and the bromine-based flame retardant system made by them can easily reach a glow-wire ignition temperature of ≥775°C. Therefore, bromine-based flame retardant nylon occupies the vast majority of the market in the field of home appliance connectors. Among halogen-free flame retardants, red phosphorus flame retardants and organic phosphine flame retardants are mainly condensed phase flame retardant, and nitrogen-based flame retardants achieve the purpose of flame retardancy by diluting combustibles and molten droplets to take away heat. The flame retardant system made by them is difficult to reach the state of not igniting at 750°C in the GWIT test, and it is difficult to meet the needs of unattended high-current home appliances.

[0004] CN118063960A discloses a 850℃ glow-wire non-combustible, high tensile strength red phosphorus flame-retardant polyamide composite material and its preparation, wherein the 850℃ glow-wire non-combustible, high tensile strength red phosphorus flame-retardant polyamide composite material comprises the following components by weight percentage: 30%-60% polyamide, 0%-40% filling component, 5%-20% microcapsule red phosphorus flame-retardant masterbatch, 0.5%-10% multi-walled carbon nanotubes, 1%-10% flame-retardant synergist, 0.1%-1% lubricant and 0.1%-1% antioxidant. The technical scheme starts from the polymer flame-retardant mechanism, and through the multi-party synergistic effect of multi-walled carbon nanotubes and flame-retardant synergist zinc borate, a red phosphorus flame-retardant polyamide composite material with a glow-wire non-combustible at 850℃ is obtained, and at the same time, it has extremely high tensile strength, but the introduction of carbon nanotubes will cause the insulation performance of the material to drop significantly, and its application is limited.

[0005] CN101885903A discloses a flame-retardant reinforced PBT composite material with a high glow-wire temperature and a production process thereof, wherein the flame-retardant reinforced PBT composite material with a high glow-wire temperature comprises the following components by weight percentage: 50%-70% PBT polybutylene terephthalate, 10%-13% 540B red phosphorus masterbatch, 2%-3.5% melamine derivative MCA, 3.2%-4.5% decabromodiphenylethane, 1.6%-2.3% antimony trioxide, and 10%-30% alkali-free glass fiber. The technical solution achieves the goal of not igniting at a glow-wire temperature of 750°C while meeting the requirements of thin-wall flame retardancy by compounding red phosphorus flame retardant, MCA, and bromine-antimony flame retardant, but the bromine-antimony flame retardant plays a key role in it, and halogen-free cannot be achieved, and it is not feasible for mass production.

[0006] Halogen-free is always the future trend, so it is necessary to develop a halogen-free flame-retardant nylon material with good mechanical properties and a glow-wire ignition temperature ≥775℃. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention aims to provide a halogen-free flame-retardant nylon material and its preparation method and application. The halogen-free flame-retardant nylon material has excellent mechanical properties, good flame retardancy, and a glow-wire ignition temperature of ≥775°C.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a halogen-free flame-retardant nylon material, comprising the following components by weight: 6 to 61 parts (e.g., 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts) of polyamide resin A, 8 to 15 parts (e.g., 9 parts, 10 parts, 11 parts, 12 parts, 13 parts or 14 parts) of red phosphorus flame retardant, 1 to 5 parts (e.g., 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts) of melamine derivative, and 20 to 50 parts (e.g., 25 parts, 30 parts, 35 parts, 40 parts or 45 parts) of glass fiber;

[0010] The polyamide resin A is a semi-aromatic polyamide resin, and the melamine derivative includes a combination of a melamine salt and a melamine condensate.

[0011] In the present invention, the halogen-free flame-retardant nylon material comprises polyamide resin A, red phosphorus flame retardant, melamine derivatives and glass fiber. The red phosphorus flame retardant plays a flame retardant role mainly in condensed phase flame retardancy, and the gas phase flame retardancy is relatively weak. The key to the glow-wire ignition temperature test is to control the concentration of combustibles to be below the critical concentration of deflagration. The system with weak gas phase flame retardancy does not have an advantage in this test. The present invention introduces melamine derivatives into the red phosphorus flame retardant system. The melamine derivatives are easily decomposed to produce inert gas when heated, dilute the concentration of combustibles, and play a synergistic role of NP in the condensed phase, so that the glow-wire performance of the entire system is greatly improved. At the same time, the addition ratio of melamine derivatives is relatively low, so that the glow-wire performance of the improved halogen-free flame-retardant nylon material maintains good mechanical properties at the same time. The halogen-free flame-retardant nylon material takes into account the characteristics of halogen-free, high flame retardant properties and high mechanical properties, can meet the needs of high glow-wire ignition temperature in the electronic and electrical industry, and has a good application prospect.

[0012] Preferably, the polyamide resin A includes any one of PA66 / 6T, PA6I / 6T or MXD6, or a combination of at least two thereof.

[0013] Preferably, the relative viscosity of the polyamide resin A at 23° C. is 2.2 to 2.8, such as 2.3, 2.4, 2.5, 2.6 or 2.7.

[0014] Preferably, the halogen-free flame-retardant nylon material further includes polyamide resin B.

[0015] Preferably, the polyamide resin B includes PA6 and / or PA66.

[0016] Preferably, the relative viscosity of the polyamide resin B at 23° C. is 2.3 to 2.8, for example, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7 or 2.75.

[0017] In the present invention, the relative viscosities of the polyamide resin A and the polyamide resin B at 23° C. are both obtained by testing according to ISO307-2019.

[0018] In the present invention, the polyamide resin A is a semi-aromatic polyamide resin. If the polyamide resin B is not added, the halogen-free flame-retardant nylon material obtained has a low cantilever beam notched impact strength and is brittle. The halogen-free flame-retardant nylon material obtained by compounding the polyamide resin A and the polyamide resin B has better performance.

[0019] Preferably, the sum of the weight parts of the polyamide resin A and the polyamide resin B is 30 to 61 parts, for example, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts.

[0020] Preferably, based on the total mass of polyamide resin A and polyamide resin B being 100%, the mass of polyamide resin A is 20% to 100%, for example, 30%, 40%, 50%, 60%, 70%, 80% or 90%.

[0021] Preferably, the red phosphorus flame retardant comprises microencapsulated red phosphorus masterbatch.

[0022] Preferably, the matrix of the microencapsulated red phosphorus masterbatch is PA6.

[0023] Preferably, the mass percentage of red phosphorus in the microencapsulated red phosphorus masterbatch is 35% to 55%, for example, 37%, 39%, 41%, 43%, 45%, 47%, 49%, 51%, 53% or 55%, etc.

[0024] Preferably, the melamine salt includes melamine cyanurate and / or melamine polyphosphate, and more preferably melamine polyphosphate.

[0025] Preferably, the melamine condensate comprises melam and / or melem.

[0026] Preferably, the mass ratio of the melamine salt to the melamine condensate is 1:2 to 2:1, for example, 1:1.8, 1:1.6, 1:1.4, 1:1.2, 1:1, 1.2:1, 1.4:1, 1.6:1 or 1.8:1.

[0027] In the present invention, the mass ratio of the melamine salt and the melamine condensate is preferably 1:2 to 2:1, and the obtained halogen-free flame-retardant nylon material has good mechanical properties and flame retardant properties. If the mass ratio of the melamine salt and the melamine condensate is too large, the charring effect is too strong and the gas dilution effect is insufficient, and the effect of improving the glow-wire performance is not obvious; if the mass ratio of the melamine salt and the melamine condensate is too small, more gas is generated, the charring effect is not strong, and the negative impact on the mechanical properties is greater.

[0028] Preferably, the glass fiber comprises alkali-free chopped glass fiber.

[0029] Preferably, the alkali-free chopped glass fibers are hydrolysis-resistant alkali-free chopped glass fibers.

[0030] Preferably, the diameter of the hydrolysis-resistant alkali-free chopped glass fiber is 9 to 13 μm (for example, 9.5 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm or 12.5 μm, etc.), and the length is 3 to 4.5 mm (for example, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, 4.2 mm or 4.4 mm, etc.).

[0031] Preferably, the halogen-free flame-retardant nylon material further comprises a lubricant.

[0032] Preferably, the weight proportion of the lubricant is 0.1 to 2 parts, for example, 0.3 parts, 0.5 parts, 0.7 parts, 0.9 parts, 1.1 parts, 1.3 parts, 1.5 parts, 1.7 parts or 1.9 parts.

[0033] Preferably, the lubricant comprises any one of silicone, montan ester lubricant or pentaerythritol ester, or a combination of at least two thereof.

[0034] Preferably, the montan ester lubricant comprises lubricant TR044W.

[0035] Preferably, the halogen-free flame-retardant nylon material further comprises an antioxidant.

[0036] Preferably, the weight proportion of the antioxidant is 0.1 to 3 parts, for example, 0.4 parts, 0.7 parts, 1.0 parts, 1.3 parts, 1.6 parts, 1.9 parts, 2.2 parts, 2.5 parts or 2.8 parts.

[0037] Preferably, the antioxidant comprises any one of hindered phenol antioxidants, hindered amine antioxidants, thioester antioxidants or phosphite antioxidants, or a combination of at least two thereof, and more preferably a combination of a hindered phenol antioxidant and a phosphite antioxidant.

[0038] Preferably, the hindered phenol antioxidant includes antioxidant IRGANOX 1098.

[0039] Preferably, the phosphite antioxidant includes antioxidant PEP-36.

[0040] Preferably, the hindered amine antioxidant includes antioxidant NAUGARD 445.

[0041] Preferably, the mass percentage of the polyamide resin A in the halogen-free flame retardant nylon material is preferably 6% to 61% (for example, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or 55%, etc.).

[0042] In a second aspect, the present invention provides a method for preparing the halogen-free flame retardant nylon material as described in the first aspect, the preparation method comprising mixing polyamide resin A, a red phosphorus flame retardant, a melamine derivative and glass fiber to obtain the halogen-free flame retardant nylon material.

[0043] Preferably, the mixing further comprises mixing with polyamide resin B, a lubricant and an antioxidant.

[0044] Preferably, the mixing is carried out in a twin-screw extruder.

[0045] Preferably, the aspect ratio of the twin-screw extruder is 40:1 or 48:1.

[0046] Preferably, the screw speed of the twin-screw extruder is 300-500 rpm, for example, 320 rpm, 340 rpm, 360 rpm, 380 rpm, 400 rpm, 420 rpm, 440 rpm, 460 rpm or 480 rpm.

[0047] Preferably, the extrusion temperature of the twin-screw extruder is 230-270°C, for example, 235°C, 240°C, 245°C, 250°C, 255°C, 260°C or 265°C.

[0048] Preferably, the preparation method specifically comprises the following steps: premixing polyamide resin A, polyamide resin B, lubricant and antioxidant in a high mixer for 1 to 3 minutes (for example, 1.2 minutes, 1.4 minutes, 1.6 minutes, 1.8 minutes, 2 minutes, 2.2 minutes, 2.4 minutes, 2.6 minutes or 2.8 minutes, etc.), adding them to the main feeding port of a twin-screw extruder, adding a red phosphorus flame retardant, a melamine derivative and glass fiber to the side feeding port of the twin-screw extruder, extruding and granulating, and obtaining the halogen-free flame retardant nylon material.

[0049] In a third aspect, the present invention provides a use of the halogen-free flame-retardant nylon material as described in the first aspect in electronic and electrical products.

[0050] In the present invention, the halogen-free flame-retardant nylon material can be widely used in electronic and electrical products, such as low-voltage electrical appliances, switches or connectors.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] In the present invention, the halogen-free flame-retardant nylon material includes polyamide resin A, red phosphorus flame retardant, melamine derivative and glass fiber. The halogen-free flame-retardant nylon material has the characteristics of halogen-free, high flame retardant performance and high mechanical properties, can meet the requirements of high glow-wire ignition temperature in the electronic and electrical industry, and has good application prospects. The tensile strength of the halogen-free flame-retardant nylon material is 115-180MPa, the flexural strength is 190-260MPa, and the cantilever beam notched impact strength is 6-13kJ / m 2 The UL94 vertical burning grade of the halogen-free flame retardant nylon material with a thickness of 0.8 mm is V-0, and the glow-wire ignition temperature of the halogen-free flame retardant nylon material with a thickness of 1.5 mm is ≥775°C. Preferably, the glow-wire ignition temperature of the halogen-free flame retardant nylon material with a thickness of 1.5 mm is ≥800°C. DETAILED DESCRIPTION

[0053] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0054] The sources of some components in the examples and comparative examples are shown in Table 1 below.

[0055] Table 1

[0056]

[0057] Glass fiber: hydrolysis-resistant alkali-free chopped glass fiber, brand ECS10-03-568H, diameter 10μm, length 3mm, manufacturer is China Jushi Co., Ltd.

[0058] Example 1

[0059] The present embodiment provides a halogen-free flame-retardant nylon material and a preparation method thereof. The halogen-free flame-retardant nylon material includes the following components in parts by weight: 15 parts of polyamide resin A (PA66 / 6T), 45 parts of polyamide resin B (PA66), 14 parts of red phosphorus flame retardant, 1.5 parts of melamine salt (melamine polyphosphate), 2 parts of melamine condensate (melamine), 30 parts of glass fiber, 0.2 parts of hindered phenol antioxidant (antioxidant IRGANOX 1098), 0.3 parts of phosphite antioxidant (antioxidant PEP-36), and 0.3 parts of lubricant (lubricant TR044W).

[0060] The preparation method of the halogen-free flame-retardant nylon material comprises the following steps:

[0061] The polyamide resin A, polyamide resin B, hindered phenol antioxidant, phosphite antioxidant and lubricant are premixed in a high-speed mixer for 3 minutes, and then added to the main feeding port of a twin-screw extruder. The red phosphorus flame retardant, melamine salt, melamine condensate and glass fiber are premixed in a high-speed mixer for 3 minutes, and then added to the side feeding port of the twin-screw extruder for extrusion granulation. The aspect ratio of the twin-screw extruder is 48:1, the screw speed of the twin-screw extruder is 400 rpm, the middle section temperature and the extrusion temperature of the twin-screw extruder are 240°C, and the halogen-free flame-retardant nylon material is obtained.

[0062] Examples 2 to 10 adopt the same preparation method as Example 1, except that the added raw materials and their contents are calculated by weight, as shown in Table 2.

[0063] Table 2

[0064]

[0065]

[0066] In Table 2, “ / ” means that the raw material was not added.

[0067] Comparative Examples 1-5 adopt the same preparation method as Example 1, except that the added raw materials and their contents are calculated by weight, as shown in Table 3.

[0068] Table 3

[0069]

[0070]

[0071] In Table 3, “ / ” means that the raw material was not added.

[0072] The halogen-free flame-retardant nylon materials provided in the above embodiments and comparative examples were dried in an oven at 120° C. for 4 hours and then injection molded into mechanical test specimens, UL94 vertical burning test specimens and glow-wire ignition temperature test specimens, and the following performance tests were performed.

[0073] (1) Tensile strength: The test was conducted in accordance with ISO 527-2-2012. The mechanical test specimen was 1A specimen and the tensile rate was 10 mm / min.

[0074] (2) Flexural strength: tested in accordance with ISO 178-2016, test speed 2 mm / min.

[0075] (3) Izod notched impact strength: tested in accordance with ISO 180-2019, notch type A, impact energy 2.75 J.

[0076] (4) UL94 vertical burning: The test is conducted in accordance with the UL94-2013 standard. The thickness of the UL94 vertical burning test specimen is 0.8 mm.

[0077] (5) Glow-wire ignition temperature: The test is conducted in accordance with IEC 60695-2-13:2021. The glow-wire ignition temperature test specimen is a square plate of 60 mm × 60 mm × 1.5 mm.

[0078] The test results are shown in Tables 4 and 5 below.

[0079] Table 4

[0080]

[0081]

[0082] Table 5

[0083]

[0084] From the contents of Table 4 and Table 5, it can be seen that the tensile strength of the halogen-free flame-retardant nylon material provided in Examples 1-10 is 115-180 MPa, the flexural strength is 190-260 MPa, and the Izod notched impact strength is 6-13 kJ / m 2 The UL-94 vertical burning grade of the 0.8mm thick sample is V-0, and the glow-wire ignition temperature of the 1.5mm thick sample is ≥775℃.

[0085] From the comparison of Examples 1-3, it can be seen that the polyamide resin A is preferably MXD6 (Example 3), and the obtained halogen-free flame-retardant nylon material has higher tensile strength and flexural strength.

[0086] Comparing Examples 1 and 4-6, if the melamine derivative is a combination of melamine polyphosphate and melamine condensate (Example 1) and (Example 6), the glow-wire ignition temperature of the obtained halogen-free flame-retardant nylon material can reach 800°C, and the mechanical properties are kept good. If the melamine derivative combination is a combination of melamine cyanurate and melamine condensate (Example 4) and (Example 5), the glow-wire ignition temperature of the obtained halogen-free flame-retardant nylon material can reach 800°C, but the mechanical properties are relatively reduced. It can be seen that the melamine derivative is preferably a combination of melamine polyphosphate and melamine condensate, and the performance of the obtained halogen-free flame-retardant nylon material is better.

[0087] Compared with Example 1, if polyamide resin B is not added (Example 7), the notched impact strength of the obtained halogen-free flame-retardant nylon material is low and the material is brittle.

[0088] Compared with Example 1, if the mass ratio of melamine salt to melamine condensate is lower (Example 8), the glow wire ignition temperature of the obtained halogen-free flame retardant nylon material is lower. It can be seen that the halogen-free flame retardant nylon material with a mass ratio of melamine salt to melamine condensate in the range of 1:2 to 2:1 has better performance.

[0089] Compared with Example 1, if polyamide resin A is not added (Comparative Example 1), the glow-wire ignition temperature of the prepared halogen-free flame-retardant nylon material is low and cannot meet the requirement of glow-wire ignition temperature ≥ 775°C.

[0090] Compared with Example 1, if the weight fraction of polyamide resin A is too low (Comparative Example 2), the glow-wire ignition temperature of the prepared halogen-free flame-retardant nylon material is low and cannot meet the requirement of glow-wire ignition temperature ≥ 775°C.

[0091] Compared with Example 1, if the melamine condensate is not added (Comparative Example 3), the glow-wire ignition temperature of the prepared halogen-free flame-retardant nylon material is low and cannot meet the requirement of glow-wire ignition temperature ≥ 775°C.

[0092] Compared with Example 1, if melamine salt is not added (Comparative Example 4), the glow-wire ignition temperature of the prepared halogen-free flame-retardant nylon material can only reach 750°C, which cannot meet the requirement of glow-wire ignition temperature ≥ 775°C.

[0093] Compared with Example 1, if no melamine derivative is added (Comparative Example 5), the glow-wire ignition temperature of the prepared halogen-free flame-retardant nylon material can only reach 725°C, which cannot meet the requirement of glow-wire ignition temperature ≥ 775°C.

[0094] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate a halogen-free flame-retardant nylon material and its preparation method and application, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A halogen-free flame-retardant nylon material, characterized in that: The halogen-free flame-retardant nylon material comprises the following components by weight: 6 to 61 parts of polyamide resin A, 8 to 15 parts of red phosphorus flame retardant, 1 to 5 parts of melamine derivative and 20 to 50 parts of glass fiber; The polyamide resin A is a semi-aromatic polyamide resin, and the melamine derivative includes a combination of a melamine salt and a melamine condensate.

2. The halogen-free flame-retardant nylon material according to claim 1, characterized in that: The polyamide resin A includes any one of PA66 / 6T, PA6I / 6T or MXD6 or a combination of at least two thereof; Preferably, the relative viscosity of the polyamide resin A at 23° C. is 2.2 to 2.8; Preferably, the halogen-free flame-retardant nylon material further comprises polyamide resin B; Preferably, the polyamide resin B includes PA6 and / or PA66; Preferably, the relative viscosity of the polyamide resin B at 23° C. is 2.3 to 2.8; Preferably, the sum of the weight parts of the polyamide resin A and the polyamide resin B is 30 to 61 parts; Preferably, based on the total mass of the polyamide resin A and the polyamide resin B being 100%, the mass of the polyamide resin A is 20% to 100%.

3. The halogen-free flame-retardant nylon material according to claim 1, characterized in that: The red phosphorus flame retardant comprises microencapsulated red phosphorus masterbatch; Preferably, the matrix of the microencapsulated red phosphorus masterbatch is PA6; Preferably, the mass percentage of red phosphorus in the microencapsulated red phosphorus masterbatch is 35% to 55%.

4. The halogen-free flame-retardant nylon material according to claim 1, characterized in that: The melamine salt includes melamine cyanurate and / or melamine polyphosphate; Preferably, the melamine condensate comprises melam and / or melem; Preferably, the mass ratio of the melamine salt to the melamine condensate is 1:2 to 2:

1.

5. The halogen-free flame-retardant nylon material according to claim 1, characterized in that: The glass fiber includes alkali-free chopped glass fiber; Preferably, the alkali-free chopped glass fibers are hydrolysis-resistant alkali-free chopped glass fibers; Preferably, the hydrolysis-resistant alkali-free chopped glass fibers have a diameter of 9 to 13 μm and a length of 3 to 4.5 mm.

6. The halogen-free flame-retardant nylon material according to claim 1, characterized in that: The halogen-free flame-retardant nylon material also includes a lubricant; Preferably, the weight portion of the lubricant is 0.1 to 2 parts; Preferably, the lubricant comprises any one of silicone, montan ester lubricant or pentaerythritol ester, or a combination of at least two thereof.

7. The halogen-free flame-retardant nylon material according to claim 1, characterized in that: The halogen-free flame-retardant nylon material also includes an antioxidant; Preferably, the antioxidant is present in an amount of 0.1 to 3 parts by weight; Preferably, the antioxidant comprises any one of hindered phenol antioxidants, hindered amine antioxidants, thioester antioxidants or phosphite antioxidants, or a combination of at least two thereof, and more preferably a combination of a hindered phenol antioxidant and a phosphite antioxidant.

8. A method for preparing a halogen-free flame-retardant nylon material according to any one of claims 1 to 7, characterized in that: The preparation method comprises mixing polyamide resin A, red phosphorus flame retardant, melamine derivative and glass fiber to obtain the halogen-free flame retardant nylon material.

9. The preparation method according to claim 8, characterized in that: The mixing also includes mixing with polyamide resin B, lubricant and antioxidant.

10. Use of the halogen-free flame-retardant nylon material according to any one of claims 1 to 7 in electronic and electrical products.

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