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

Abstract

The application provides a halogen-free flame-retardant nylon material and 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 red phosphorus flame retardant, 1-5 parts of melamine derivative and 20-50 parts of glass fiber; the polyamide resin A is a semi-aromatic polyamide resin, and the melamine derivative comprises a combination of melamine salt and melamine condensate. The halogen-free flame-retardant nylon material provided in the application has excellent mechanical properties, good flame-retardant performance and a glowing filament ignition temperature of greater than or equal to 775 DEG C.

Description

TECHNICAL FIELD

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

[0002] In the electronic and electrical industry, the flame-retardant performance of plastic parts of household appliances is very strict, and the glowing wire performance of the material is also very high. IEC60335 clearly stipulates the glowing wire performance of materials for large-current household appliances in unattended state, and the core requirement is to achieve a glowing wire ignition temperature (GWIT) of 775℃ or more, which means that the material needs to reach at least 750℃ without ignition or extinguish within 5s under the test thickness.

[0003] From the flame-retardant mechanism of different types of flame retardants and the failure mechanism of the glowing wire test, the bromine-based flame retardant is mainly characterized by gas-phase flame retardation, and the bromine-based flame-retardant system made of it is more likely to achieve a glowing wire ignition temperature of 775℃ or more, so that the bromine-based flame-retardant nylon occupies a large part of the market in the field of household appliance connectors. Among the halogen-free flame retardants, red phosphorus flame retardants and organic phosphorus flame retardants are mainly condensed phase flame retardants, and nitrogen-based flame retardants dilute combustible materials and melt droplets to remove heat to achieve flame retardation. The flame-retardant system made of them is very difficult to achieve 750℃ without ignition in the GWIT test, and it is also difficult to meet the needs of large-current household appliances in unattended state.

[0004] CN118063960A discloses an 850℃ glowing wire non-ignition, high tensile strength red phosphorus flame-retardant polyamide composite material and its preparation. The 850℃ glowing wire non-ignition, high tensile strength red phosphorus flame-retardant polyamide composite material contains the following components by weight percentage: polyamide 30%-60%, filling component 0%-40%, microcapsule red phosphorus flame-retardant master batch 5%-20%, multi-walled carbon nanotube 0.5%-10%, flame-retardant synergist 1%-10%, lubricant 0.1%-1%, and antioxidant 0.1%-1%. This technical solution starts from the flame-retardant mechanism of polymers, and through the synergistic effect of multi-walled carbon nanotubes and flame-retardant synergists such as zinc borate, an 850℃ glowing wire non-ignition red phosphorus flame-retardant polyamide composite material is prepared, which also has extremely high tensile strength. However, the introduction of carbon nanotubes will cause a significant decrease in the insulation performance of the material, and the application is limited.

[0005] CN101885903A discloses a flame-retardant reinforced PBT composite material with high glowing wire temperature and a production process thereof, the flame-retardant reinforced PBT composite material with high glowing wire temperature comprises the following components in percentage by weight: PBT polybutylene terephthalate 50%-70%, 540B red phosphorus masterbatch 10%-13%, melamine derivative MCA 2%-3.5%, decabromodiphenyl ethane 3.2%-4.5%, antimony trioxide 1.6%-2.3%, alkali-free glass fiber 10%-30%. The technical scheme realizes non-flaming at 750℃ of glowing wire by compounding of red phosphorus flame retardant, MCA, bromine-antimony flame retardant, meets the thin-wall flame-retardant case, but the bromine-antimony flame retardant plays a key role therein, cannot realize halogen-free, and practically does not have mass production feasibility.

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

[0007] In view of the deficiencies of the prior art, the purpose of the present application is to provide a halogen-free flame-retardant nylon material and a preparation method and application thereof. The halogen-free flame-retardant nylon material has excellent mechanical properties, good flame-retardant properties, and a glowing wire ignition temperature of ≥775℃.

[0008] To achieve this purpose, the present application adopts the following technical scheme:

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

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

[0011] In the present application, the halogen-free flame-retardant nylon material comprises polyamide resin A, red phosphorus flame retardant, melamine derivative and glass fiber. The red phosphorus flame retardant plays a flame-retardant role mainly in condensed phase flame retardation, and the gas phase flame retardation is relatively weak. The key to the glow wire ignition temperature test is to control the flammable material concentration below the critical concentration of deflagration, and the system with weak gas phase flame retardation does not have an advantage in this test. In the present application, melamine derivative is introduced into the red phosphorus flame-retardant system. Melamine derivative is easy to decompose and produce inert gas when heated, which dilutes the concentration of flammable material, and at the same time, plays a N-P synergistic effect in the condensed phase, so that the glow wire performance of the whole system is greatly improved. At the same time, the addition proportion of melamine derivative is relatively low, so that the improved halogen-free flame-retardant nylon material has good mechanical properties while improving the glow wire performance. The halogen-free flame-retardant nylon material has the characteristics of halogen-free, high flame-retardant performance and high mechanical properties, and can meet the demand of high glow wire ignition temperature in the electronic and electrical industry, and has good application prospect.

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

[0013] Preferably, the polyamide resin A has a relative viscosity of 2.2-2.8 at 23℃, such as 2.3, 2.4, 2.5, 2.6 or 2.7, etc.

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

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

[0016] Preferably, the polyamide resin B has a relative viscosity of 2.3-2.8 at 23℃, such as 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7 or 2.75, etc.

[0017] In the present application, the relative viscosities of the polyamide resin A and the polyamide resin B at 23℃ are both tested according to ISO307-2019.

[0018] In the present application, the polyamide resin A is a semi-aromatic polyamide resin. If no polyamide resin B is added, the halogen-free flame-retardant nylon material prepared has low Izod notched impact strength, and the material is brittle. The halogen-free flame-retardant nylon material prepared 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 30-61 parts, such as 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, etc.

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

[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 comprises melamine cyanurate and / or melamine polyphosphate, further preferably melamine polyphosphate.

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

[0026] Preferably, the mass ratio of the melamine salt and 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, etc.

[0027] In the present application, the mass ratio of the melamine salt and the melamine condensate is preferably 1:2 to 2:1, and the halogen-free flame-retardant nylon material prepared 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 improvement of 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 and the charring effect is not strong, and the negative impact on the mechanical properties is greater.

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

[0029] Preferably, the alkali-free short-cut glass fiber is hydrolysis-resistant alkali-free short-cut glass fiber.

[0030] Preferably, the diameter of the hydrolysis-resistant alkali-free short-cut 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 lubricant is present in an amount of 0.1 to 2 parts by weight, such as 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, etc.

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

[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 antioxidant is present in an amount of 0.1 to 3 parts by weight, such as 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, etc.

[0037] Preferably, the antioxidant comprises any one or a combination of a hindered phenolic antioxidant, a hindered amine antioxidant, a thioester antioxidant, or a phosphite antioxidant, further preferably a combination of a hindered phenolic antioxidant and a phosphite antioxidant.

[0038] Preferably, the hindered phenolic antioxidant comprises antioxidant IRGANOX 1098.

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

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

[0041] Preferably, the polyamide resin A is present in the halogen-free flame-retardant nylon material in an amount of 6% to 61% (such as 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, or 55%, etc.) by mass.

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

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

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

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

[0046] Preferably, the screw rotation 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, etc.

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

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

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

[0050] In the present application, 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, etc.

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

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

[0053] The technical solutions of the present application are further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as specific limitations on the present application.

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

[0055] Table 1

[0056]

[0057] Glass fiber: hydrolysis-resistant alkali-free short-cut glass fiber, with a trade name of glass fiber ECS10-03-568H, a diameter of 10 μm, a length of 3 mm, and a manufacturer of 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 comprises the following components in parts by weight: polyamide resin A (PA66 / 6T) 15 parts, polyamide resin B (PA66) 45 parts, red phosphorus flame retardant 14 parts, melamine salt (melamine polyphosphate) 1.5 parts, melamine condensate (melam) 2 parts, glass fiber 30 parts, hindered phenolic antioxidant (antioxidant IRGANOX 1098) 0.2 parts, phosphite antioxidant (antioxidant PEP-36) 0.3 parts, and lubricant (lubricant TR044W) 0.3 parts.

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

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

[0062] Examples 2-10 use the same preparation method as Example 1, except that the raw materials and their contents are different, as shown in Table 2.

[0063] Table 2

[0064]

[0065]

[0066] In Table 2, " / " represents that the raw material is not added.

[0067] Comparative Examples 1-5 were prepared by the same method as Example 1, except for the raw materials and contents added, in parts by weight, as shown in Table 3.

[0068] Table 3

[0069]

[0070]

[0071] In Table 3, " / " represents that the raw material is not added.

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

[0073] (1) Tensile strength: tested according to ISO 527-2-2012, with the mechanical test sample being a 1A bar and the tensile rate being 10 mm / min.

[0074] (2) Flexural strength: tested according to ISO 178-2016, with the test speed being 2 mm / min.

[0075] (3) Notched Izod impact strength: tested according to ISO 180-2019, with the notch type being A type and the impact energy being 2.75 J.

[0076] (4) UL94 vertical burning: tested according to the UL94-2013 standard, with the UL94 vertical burning test sample thickness being 0.8 mm.

[0077] (5) Glow wire ignition temperature: tested according to IEC 60695-2-13:2021, with the glow wire ignition temperature test sample being a 60 mm x 60 mm x 1.5 mm square plate.

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

[0079] Table 4

[0080]

[0081]

[0082] Table 5

[0083]

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

[0086] From the comparison of Examples 1, 4-6, if the combination of the melamine derivative is melamine polyphosphate and melamine condensate (Example 1) and (Example 6), the glow wire ignition temperature of the halogen-free flame-retardant nylon material prepared can reach 800℃, and the mechanical properties are maintained well. If the combination of the melamine derivative is melamine cyanurate and melamine condensate (Example 4) and (Example 5), the glow wire ignition temperature of the halogen-free flame-retardant nylon material prepared can reach 800℃, but the mechanical properties relatively decrease. Therefore, it can be seen that the combination of melamine polyphosphate and melamine condensate is preferred as the melamine derivative, and the halogen-free flame-retardant nylon material prepared has better performance.

[0087] From the comparison of Example 1, if no polyamide resin B is added (Example 7), the notched impact strength of the halogen-free flame-retardant nylon material prepared is lower, and the material is brittle.

[0088] From the comparison of Example 1, if the mass ratio of the melamine salt and the melamine condensate is low (Example 8), the glow wire ignition temperature of the halogen-free flame-retardant nylon material prepared decreases. Therefore, it can be seen that the halogen-free flame-retardant nylon material prepared has better performance when the mass ratio of the melamine salt and the melamine condensate is in the range of 1:2-2:1.

[0089] From the comparison of Example 1, if no polyamide resin A is added (Comparative Example 1), the glow wire ignition temperature of the halogen-free flame-retardant nylon material prepared is low, and cannot meet the requirement of glow wire ignition temperature ≥775℃.

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

[0091] From the comparison of Example 1, if no melamine condensate is added (Comparative Example 3), the glow wire ignition temperature of the halogen-free flame-retardant nylon material prepared is low, and cannot meet the requirement of glow wire ignition temperature ≥775℃.

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

[0093] In comparison with Example 1, if the melamine derivative is not added (Comparative Example 5), the ignition temperature of the prepared halogen-free flame-retardant nylon material can only reach 725°C, which cannot meet the requirement of ignition temperature ≥775°C.

[0094] The applicant declares that the present application is illustrated by the above examples, but the present application is not limited to the above examples, i.e. it does not mean that the present application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A halogen-free flame-retardant nylon material, characterized by, The halogen-free flame-retardant nylon material comprises, by weight fraction, the following components: 6-61 parts of polyamide resin A, 8-15 parts of red phosphorus flame retardant, 1-5 parts of melamine derivative, and 20-50 parts of glass fiber; The mass percentage of the polyamide resin A in the halogen-free flame-retardant nylon material is 10%-61%; The polyamide resin A is a semi-aromatic polyamide resin, and the melamine derivative comprises a combination of melamine salt and melamine condensate; The melamine salt comprises melamine cyanurate and / or melamine polyphosphate; The melamine condensate comprises melam and / or melem.

2. The halogen-free flame retardant nylon material of claim 1, wherein, The polyamide resin A comprises any one or a combination of at least two of PA66 / 6T, PA6I / 6T, or MXD6.

3. The halogen-free flame retardant nylon material of claim 1, wherein, The relative viscosity of the polyamide resin A at 23°C is 2.2-2.8; The relative viscosity of the polyamide resin A at 23°C is tested according to ISO 307-2019.

4. The halogen-free flame retardant nylon material of claim 1, wherein, The halogen-free flame-retardant nylon material further comprises polyamide resin B.

5. The halogen-free flame retardant nylon material of claim 4, wherein, The polyamide resin B comprises PA6 and / or PA66.

6. The halogen-free flame retardant nylon material of claim 4, wherein, The relative viscosity of the polyamide resin B at 23°C is 2.3-2.8; The relative viscosity of the polyamide resin B at 23°C is tested according to ISO 307-2019.

7. The halogen-free flame retardant nylon material of claim 4, wherein, The sum of the weight fractions of the polyamide resin A and the polyamide resin B is 30-61 parts.

8. The halogen-free flame retardant nylon material of claim 4, wherein, The mass of the polyamide resin A is 20%-100% based on the total mass of the polyamide resin A and the polyamide resin B being 100%.

9. The halogen-free flame retardant nylon material of claim 1, wherein, The red phosphorus flame retardant comprises microencapsulated red phosphorus masterbatch.

10. The halogen-free flame retardant nylon material of claim 9, wherein, The matrix of the microencapsulated red phosphorus masterbatch is PA6.

11. The halogen-free flame retardant nylon material of claim 9, wherein, The mass percentage of red phosphorus in the microencapsulated red phosphorus masterbatch is 35%-55%.

12. The halogen-free flame retardant nylon material of claim 1, wherein, The mass ratio of the melamine salt to the melamine condensate is 1:2-2:

1.

13. The halogen-free flame retardant nylon material of claim 1, wherein, The glass fiber comprises alkali-free short-cut glass fiber.

14. The halogen-free flame retardant nylon material of claim 13, wherein, The alkali-free short-cut glass fiber is hydrolysis-resistant alkali-free short-cut glass fiber.

15. The halogen-free flame retardant nylon material of claim 14, wherein, The diameter of the hydrolysis-resistant alkali-free short-cut glass fiber is 9-13 μm, and the length is 3-4.5 mm.

16. The halogen-free flame retardant nylon material of claim 1, wherein, The halogen-free flame-retardant nylon material further comprises lubricant.

17. The halogen-free flame retardant nylon material of claim 16, wherein, The weight fraction of the lubricant is 0.1-2 parts.

18. The halogen-free flame retardant nylon material of claim 16, wherein, The lubricant comprises any one or a combination of at least two of silicone, montan ester lubricant, or pentaerythritol ester.

19. The halogen-free flame retardant nylon material of claim 1, wherein, The halogen-free flame-retardant nylon material further comprises antioxidant.

20. The halogen-free flame retardant nylon material of claim 19, wherein, The weight fraction of the antioxidant is 0.1-3 parts.

21. The halogen-free flame retardant nylon material of claim 19, wherein, The antioxidant comprises any one or a combination of at least two of hindered phenol antioxidant, hindered amine antioxidant, thioester antioxidant, or phosphite antioxidant.

22. The halogen-free flame retardant nylon material of claim 21, wherein, The antioxidant comprises a combination of hindered phenol antioxidant and phosphite antioxidant.

23. A process for preparing a halogen-free flame-retardant nylon material as claimed in any one of claims 1 to 22, characterized in that, The preparation method comprises mixing the polyamide resin A, the red phosphorus flame retardant, the melamine derivative, and the glass fiber to obtain the halogen-free flame-retardant nylon material.

24. The method of claim 23, wherein, The mixing further comprises mixing with the polyamide resin B, the lubricant, and the antioxidant.

25. Use of the halogen-free flame-retardant nylon material according to any one of claims 1-22 in electronic and electrical products.

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