Flame-retardant nylon material and preparation method thereof

Abstract

The invention discloses a flame-retardant nylon material and a preparation method thereof, and 100 parts by mass of the flame-retardant nylon material comprises the following components: 40-80 parts by mass of nylon resin; 15 to 20 parts of a halogen-free flame retardant; 0-5 parts of a synergistic flame retardant; 0-40 parts of glass fiber; 0.1 to 1.5 parts of an acid acceptor; 0.1 to 1.5 parts of a polyhydroxy inhibitor; wherein the halogen-free flame retardant is prepared from alkyl phosphinate and aluminum phosphite; the acid acceptor is selected from at least one of metal hydroxide, hydrotalcite, zinc stannate, hydroxyapatite and metal oxide. According to the flame-retardant nylon material provided by the invention, the use of melamine polyphosphate in a flame-retardant system is avoided, so that the precipitation of a flame retardant is reduced from the source, and the formation of mold scale is reduced; an alkaline substance is provided as an acid acceptor to react with an acidic substance separated out from the flame retardant, and the polyhydroxy inhibitor and the acid acceptor cooperate to slow down the heat release rate, reduce the degradation effect of the acidic substance on the nylon resin and further reduce the formation of mold scale.

Description

Technical Field

[0001] This application relates to the field of flame-retardant nylon materials technology, and in particular to a flame-retardant nylon material and its preparation method. Background Technology

[0002] Polyamide, commonly known as nylon, is a general term for thermoplastic resins containing repeating amide groups -[NHCO]- in their molecular backbone. As an engineering plastic possessing both strength and toughness, coupled with its good flowability and ease of processing, it is widely used in electronics, automotive, and other industries. However, unmodified nylon has low flame retardancy, achieving a UL94 V-2 rating in vertical burning, with a limiting oxygen index of approximately 24%, classifying it as a flammable material that can easily cause fires during use.

[0003] Flame-retardant nylon materials achieve specific levels of flame retardant performance by introducing flame retardants. Based on the type of flame retardant, common flame-retardant nylon materials are divided into two main categories: brominated flame retardants and halogen-free flame retardants. Brominated flame-retardant nylon materials are subject to environmental regulations, and their use in high-voltage electrical equipment and components is limited due to their relatively low comparative tracking index (CTI) value. In contrast, flame-retardant nylon materials can achieve CTI values ​​up to 600V and meet environmental regulations, making them widely used in the high-voltage electrical field.

[0004] When preparing flame-retardant nylon materials, halogen-free flame retardants are prone to decomposition reactions and release acidic substances, which lead to resin degradation and reduced performance. At the same time, the substances produced by decomposition will continuously accumulate in the injection mold to form mold fouling. Mold fouling can easily block the venting channel or adhere to the product, affecting the product's appearance.

[0005] In related technologies, ethylene copolymers are added as adsorbents, and the amount added is controlled to prepare low-fouling, halogen-free thermoplastic polyamide compositions, thereby reducing the release of small molecules during injection molding. However, ethylene copolymers are often used as toughening agents, which can reduce the mechanical properties of flame-retardant materials and weaken their flame-retardant rating. Summary of the Invention

[0006] In view of this, this application provides a flame-retardant nylon material and its preparation method. This application uses a composite flame retardant of alkyl phosphinate and aluminum phosphite to avoid the use of melamine polyphosphate, which has poor thermal stability, thereby reducing the acidic substances released by the flame retardant from the source. Through the synergistic effect of polyhydroxyl inhibitors and acid absorbers, low precipitation and low scale formation are achieved while maintaining good mechanical properties and flame retardant rating.

[0007] In a first aspect, this application provides a flame-retardant nylon material, which, based on 100 parts by weight, comprises the following components in parts by weight:

[0008] 40-80 parts of nylon resin;

[0009] 15-20 parts of halogen-free flame retardant;

[0010] Synergistic flame retardant 0-5 parts;

[0011] 0-40 parts glass fiber;

[0012] 0.1-1.5 parts of acid absorbent;

[0013] Polyhydroxyl inhibitor 0.1-1.5 parts;

[0014] The halogen-free flame retardant includes alkyl phosphinate and aluminum phosphite;

[0015] The acid absorbent is selected from at least one of metal hydroxides, hydrotalcite, zinc stannate, hydroxyapatite, and metal oxides.

[0016] The flame-retardant nylon material provided in this application uses a composite flame retardant of alkyl phosphinate and aluminum phosphite. This avoids the use of melamine polyphosphate, which has poor thermal stability, in the flame-retardant system, thereby reducing the release of acidic substances from the flame retardant and minimizing mold fouling. Simultaneously, in the melamine polyphosphate-free flame-retardant system, an alkaline substance is provided as an acid absorber to react with the acidic substances released from the flame retardant. The polyhydroxyl inhibitor works synergistically with the acid absorber to inhibit the release of acidic substances, slow down the heat release rate, and reduce the degradation effect of acidic substances on the nylon resin, further reducing mold fouling. This achieves low release and low mold fouling while maintaining good mechanical properties and flame retardant rating.

[0017] In some embodiments, the alkylphosphinate content is 70%-90% by mass and the aluminum phosphite content is 10%-30% by mass, based on the mass of the halogen-free flame retardant.

[0018] Alkyl phosphinates and aluminum phosphite within the above range exhibit good flame retardant synergy, resulting in better flame retardant performance of the prepared flame-retardant nylon material.

[0019] In some embodiments, the acid absorbent includes at least one of zirconium hydroxide, magnesium hydroxide, and aluminum hydroxide.

[0020] The metal oxide includes at least one of zirconium oxide, zinc oxide, aluminum oxide, and magnesium oxide.

[0021] Taking metal hydroxides as an example, such as zirconium hydroxide, they are more alkaline and have better thermal stability, which makes them more conducive to fixing acidic substances and reacting with them, thereby further reducing the amount of mold fouling.

[0022] In some embodiments, the synergistic flame retardant is selected from at least one of melamine cyanurate and zinc borate.

[0023] In some embodiments, the alkylphosphinate includes at least one selected from aluminum diethylphosphinate, sodium diethylphosphinate, and aluminum n-propylphosphinate. Preferably, the alkylphosphinate is aluminum diethylphosphinate; the synergistic flame retardant is zinc borate.

[0024] In the halogen-free flame retardant system provided in this application, since melamine polyphosphate is not used, the amount of halogen-free flame retardant (alkyl phosphite and aluminum phosphite) is increased to ensure the flame retardant effect. However, halogen-free flame retardant is also a source of mold fouling. Using zinc borate as a synergistic flame retardant, it works synergistically with the halogen-free flame retardant, which makes it easier to reduce the amount of halogen-free flame retardant used and helps to reduce mold fouling, so as to achieve efficient and stable flame retardancy.

[0025] In some embodiments, the polyhydroxy inhibitor comprises a polyol having at least four hydroxyl functional groups.

[0026] In some embodiments, the polyol includes at least one of pentaerythritol, ethylene glycol, and 1,4-butanediol.

[0027] Preferably, the polyhydroxy inhibitor is dipentaerythritol.

[0028] Polyhydroxyl inhibitors work synergistically with acid scavengers to inhibit the precipitation of acidic substances and also have a thermal stabilizing effect, delaying the decomposition of nylon resin due to acidic substances. Taking dipentaerythritol as an example, it has a long carbon chain and stable ether bonds, and its molecule contains multiple hydroxyl groups, resulting in a stronger synergistic effect with acid scavengers such as zirconium hydroxide.

[0029] In some embodiments, the flame-retardant nylon material further comprises: 0.1-1 part of antioxidant.

[0030] In some embodiments, the antioxidant is selected from at least one of hindered phenolic antioxidants, phosphite antioxidants, and thioether antioxidants.

[0031] In some embodiments, the flame-retardant nylon material further comprises: 0.1-1 parts of lubricant.

[0032] In some embodiments, the lubricant is selected from at least one of hydrocarbon lubricants, stearic acid soap lubricants, stearate ester lubricants, stearamide lubricants, and silicone lubricants.

[0033] Suitable antioxidants and lubricants, as additives, are beneficial to the preparation of flame-retardant nylon materials.

[0034] Secondly, this application provides a method for preparing a flame-retardant nylon material, the method comprising at least the following steps:

[0035] The material is provided in accordance with the components and component contents as described in any of the above items;

[0036] All components except glass fiber are mixed evenly to obtain a premix;

[0037] The premix and the glass fiber are melt-mixed and extruded to obtain the flame-retardant nylon material.

[0038] The beneficial effects of the technical solutions provided by some embodiments of this application include at least the following:

[0039] In this application, a composite flame retardant of alkyl phosphinate and aluminum phosphite is used to avoid the use of melamine polyphosphate, which has poor thermal stability, in the flame retardant system. This reduces the release of acidic substances from the flame retardant at the source and reduces the formation of mold deposits. At the same time, in the melamine polyphosphate-free flame retardant system, an alkaline substance is provided as an acid absorber to react with the acidic substances released from the flame retardant. The polyhydroxyl inhibitor works synergistically with the acid absorber to inhibit the release of acidic substances, slow down the heat release rate, reduce the degradation effect of acidic substances on nylon resin, and further reduce the formation of mold deposits. This achieves low release and low mold deposits while maintaining good mechanical properties and flame retardant rating. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] This application provides a flame-retardant nylon material, which, based on 100 parts by weight, comprises the following components in parts by weight:

[0042] 40-80 parts of nylon resin;

[0043] 15-20 parts of halogen-free flame retardant;

[0044] Synergistic flame retardant 0-5 parts;

[0045] 0-40 parts glass fiber;

[0046] 0.1-1.5 parts of acid absorbent;

[0047] Polyhydroxyl inhibitor 0.1-1.5 parts;

[0048] Among them, halogen-free flame retardants include alkyl phosphinates and aluminum phosphite;

[0049] The acid absorbent is selected from at least one of metal hydroxides, hydrotalcite, zinc stannate, hydroxyapatite, and metal oxides.

[0050] The flame-retardant nylon material uses a composite flame retardant of alkyl phosphinate and aluminum phosphite. This avoids the use of melamine polyphosphate, which has poor thermal stability, in the flame-retardant system, thereby reducing the release of acidic substances from the flame retardant and minimizing mold fouling. Simultaneously, in the melamine-free flame-retardant system, an alkaline substance is provided as an acid absorber to react with the acidic substances released from the flame retardant. The polyhydroxyl inhibitor works synergistically with the acid absorber to inhibit the release of acidic substances, slow down the heat release rate, and reduce the degradation effect of acidic substances on the nylon resin, further reducing mold fouling. This achieves low release and low mold fouling while maintaining good mechanical properties and flame retardant rating.

[0051] In some embodiments, the nylon resin is at least one of PA6 resin and PA66 resin; based on 100 parts by weight, the nylon resin is 40-80 parts, for example, 40 parts, 50 parts, 60 parts, 70 parts, or 80 parts, and of course, any combination of the above values ​​is also possible.

[0052] In some embodiments, 15-20 parts of halogen-free flame retardant are used per 100 parts by weight, for example, 15, 16, 17, 18, 19, or 20 parts, or any combination of the above values.

[0053] In some embodiments, the alkyl phosphite content is 70%-90% by mass and the aluminum phosphite content is 10%-30% by mass, based on the mass of the halogen-free flame retardant.

[0054] In some embodiments, the alkylphosphinate includes at least one selected from aluminum diethylphosphinate, sodium diethylphosphinate, and aluminum n-propylphosphinate. Preferably, the alkylphosphinate is aluminum diethylphosphinate.

[0055] Alkyl phosphinates and aluminum phosphite within the above range exhibit good flame retardant synergy, resulting in better flame retardant performance of the prepared flame-retardant nylon material.

[0056] In some embodiments, the synergistic flame retardant is 0-5 parts per 100 parts by weight, for example, 1 part, 2 parts, 3 parts, 4 parts, or 5 parts. Of course, it can also be any combination of the above values. Preferably, the synergistic flame retardant is 0.3-0.8 parts.

[0057] In some embodiments, the synergistic flame retardant is selected from at least one of melamine cyanurate and zinc borate. Preferably, the synergistic flame retardant is zinc borate.

[0058] In the halogen-free flame retardant system provided in this application, since melamine polyphosphate is not used, the amount of halogen-free flame retardant (a composite flame retardant of alkyl phosphinate and aluminum phosphite) is increased to ensure the flame retardant effect. However, the halogen-free flame retardant is also a source of mold fouling. Using zinc borate as a synergistic flame retardant, which works synergistically with the halogen-free flame retardant, makes it easier to reduce the amount of halogen-free flame retardant used, which helps to reduce mold fouling and achieve efficient and stable flame retardancy.

[0059] In some embodiments, the amount of glass fiber is 0-40 parts per 100 parts by weight, for example, 10 parts, 20 parts, 30 parts, or 40 parts, or any combination of the above values.

[0060] In some embodiments, the glass fibers have an average diameter of 7-13 μm and an average length of 1.5-5 mm.

[0061] In some embodiments, the acid absorbent is 0.1-1.5 parts per 100 parts by weight, for example, 0.1 parts, 0.5 parts, 1 part, 1.5 parts, or any combination of the above values.

[0062] In some embodiments, the acid absorbent includes at least one of zirconium hydroxide, magnesium hydroxide, and aluminum hydroxide as the metal hydroxide; and at least one of zirconium oxide, zinc oxide, aluminum oxide, and magnesium oxide as the metal oxide. Preferably, the metal hydroxide is zirconium hydroxide.

[0063] Taking metal hydroxides as an example, such as zirconium hydroxide, they are more alkaline and have better thermal stability, which makes them more conducive to fixing acidic substances and reacting with them, thereby further reducing the amount of mold fouling.

[0064] In some embodiments, the polyhydroxy inhibitor is 0.1-1.5 parts per 100 parts by weight, for example, 0.1 parts, 0.5 parts, 1 part, 1.5 parts, or any combination of the above values.

[0065] In some embodiments, the polyhydroxy inhibitor comprises a polyol, wherein the polyol is a polyol having at least four hydroxyl functional groups.

[0066] The polyol includes at least one of dipentaerythritol, ethylene glycol, and 1,4-butanediol. Preferably, the polyhydroxy inhibitor is dipentaerythritol.

[0067] Polyhydroxyl groups work synergistically with acid scavengers to inhibit the precipitation of acidic substances and also have a thermal stabilizing effect, delaying the decomposition of nylon resin due to acidic substances. Taking dipentaerythritol as an example, it has a long carbon chain and stable ether bonds, and its molecule contains multiple hydroxyl groups, resulting in a stronger synergistic effect with acid scavengers such as zirconium hydroxide.

[0068] In some embodiments, the flame-retardant nylon material further comprises: 0.1-1 part of an antioxidant. Preferably, the antioxidant is selected from at least one of hindered phenolic antioxidants, phosphite antioxidants, and thioether antioxidants.

[0069] In some embodiments, the flame-retardant nylon material further comprises 0.1-1 part of a lubricant. Preferably, the lubricant is selected from at least one of hydrocarbon lubricants, stearic acid soap lubricants, stearate ester lubricants, stearamide lubricants, and silicone lubricants.

[0070] Suitable antioxidants and lubricants, as additives, are beneficial to the preparation of flame-retardant nylon materials.

[0071] Preparation method of flame retardant nylon materials

[0072] The preparation method of flame-retardant nylon material includes at least the following steps:

[0073] Step S1: Provide materials according to the following components and component contents;

[0074] 40-80 parts of nylon resin;

[0075] 15-20 parts of halogen-free flame retardant;

[0076] Synergistic flame retardant 0-5 parts;

[0077] 0-40 parts glass fiber;

[0078] 0.1-1.5 parts of acid absorbent;

[0079] Polyhydroxyl inhibitor 0.1-1.5 parts;

[0080] Antioxidant 0.1-1 part;

[0081] Lubricant 0.1-1 part.

[0082] Step S2: Mix all components except glass fiber evenly to obtain a premix;

[0083] Step S3: Add the premix and glass fiber to a twin-screw extruder for melt mixing, and then extrude and granulate to obtain flame-retardant nylon material.

[0084] Specifically, the premixed material is added to the twin-screw extruder through the main feed port, and the glass fiber is added to the twin-screw extruder through the side feed port. The materials are then melt-mixed, extruded, and granulated to obtain flame-retardant nylon material. The temperature of the twin-screw extruder is 260℃-280℃, and the screw speed is 350 rpm.

[0085] The following examples describe the disclosure of this invention in more detail. These examples are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of this disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on mass, and all reagents used in the examples are commercially available or synthesized by conventional methods and can be used directly without further processing. The instruments used in the examples are also commercially available.

[0086] The raw materials used in the following examples and comparative examples are as follows:

[0087] Nylon resin: including a mixture of PA66 resin and PA6 resin;

[0088] PA66 resin: EP-158, relative viscosity 2.7, from Huafeng Group Co., Ltd.;

[0089] PA6 resin: HY-2800A, relative viscosity 2.8, from Haiyang Chemical Fiber Co., Ltd.;

[0090] Glass fiber: ECS301HP-3-H, diameter 10μm, length 3mm, from Chongqing International Composite Materials Co., Ltd.;

[0091] Halogen-free flame retardant: LFR-5009, composed of aluminum diethylphosphinate and aluminum phosphite, from Jiangsu Liside New Material Co., Ltd.;

[0092] Melamine polyphosphate (MPP flame retardant): MPP-A, from Sichuan Fine Chemical Design and Research Institute;

[0093] Zinc borate: from Shandong Wuwei Technology Co., Ltd.;

[0094] Zirconium hydroxide: from Jiangxi Jingan High-Tech Co., Ltd.;

[0095] Dipentaerythritol (DPE): from Jiangsu Kailin Ruiyang Chemical Co., Ltd.

[0096] Antioxidant: A mixture of hindered phenolic antioxidant 1098 and phosphite antioxidant 168 in a mass ratio of 1:1, Tianjin Lianlong New Material Co., Ltd.

[0097] Lubricant: Hyperbranched polyester Hyper C181, Wuhan Hyperbranched Resin Technology Co., Ltd.

[0098] The preparation method of flame-retardant nylon material is as follows:

[0099] All components except glass fiber are mixed evenly to obtain a premix.

[0100] The premixed material is added to the twin-screw extruder through the main feed port, and the glass fiber is added to the twin-screw extruder through the side feed port. The materials are then melt-mixed, extruded, and granulated to produce flame-retardant nylon material. The temperature of the twin-screw extruder is 260℃-280℃, and the screw speed is 350 rpm.

[0101] The flame-retardant nylon materials prepared in each embodiment and comparative example were tested for the following relevant performance indicators under the same test conditions.

[0102] (1) Mold fouling test: After each flame-retardant nylon material was continuously injected at an injection temperature of 280℃~300℃ for 200 times, the mold fouling on the mold was collected and weighed.

[0103] (2) Tensile strength test: According to GB / T 1040.1-2018, the test conditions are: tensile rate 10 mm / min;

[0104] (3) Flame retardant rating test: Vertical burning performance test was conducted according to GB / T 2408-2008 standard, and the thickness of the test strip was 1.6mm.

[0105] The components, their corresponding mass fractions, and test results in the examples and comparative examples are shown in Table 1. The only difference between the examples and comparative examples is the type and ratio of the components.

[0106] Table 1

[0107]

[0108] Note: Blank spaces in Table 1 indicate that the component was not added.

[0109] As can be seen from Table 1, compared with the comparative example, the flame-retardant nylon materials prepared in the embodiments of this application can maintain good tensile strength and flame-retardant properties. However, when comparing the amount of residual mold fouling after 200 injection molding cycles, it can be found that the amount of residual mold fouling in comparative example 5 can reach a maximum of 2.41 mg, while the amount of residual mold fouling in the embodiments of this application is reduced and is less than 1.0 mg. This indicates that the flame-retardant nylon materials prepared according to the components and corresponding proportions provided in this application can significantly reduce the amount of mold fouling during the injection molding process, achieving the goals of low precipitation, low mold fouling, high flame retardancy, and high mechanical properties.

[0110] Compared with Examples 1-3, Comparative Example 1 did not contain zirconium hydroxide and dipentaerythritol, and therefore had a larger amount of mold scale.

[0111] Compared with Examples 1-3, Comparative Example 2 still showed a relatively large amount of mold fouling when only dipentaerythritol was used; as the amount of zirconium hydroxide added increased, the amount of mold fouling gradually decreased, indicating that zirconium hydroxide can effectively reduce the amount of mold fouling. However, since the reaction between zirconium hydroxide and the precipitated substances of flame retardant is relatively strong, it will slightly weaken the mechanical properties. Therefore, the amount of zirconium hydroxide added needs to be controlled according to the actual working conditions.

[0112] Compared with Example 1, Comparative Example 3 had a higher amount of zirconium hydroxide added, resulting in the same amount of mold fouling as Example 1, but Example 1 had better mechanical properties. Compared with Example 3, the amount of mold fouling was still higher when only zirconium hydroxide was added. As the amount of dipentaerythritol added increased, the amount of mold fouling gradually decreased, indicating that dipentaerythritol can also effectively reduce the amount of mold fouling.

[0113] Therefore, comparing Comparative Examples 1-3 with Examples 1-3 shows that in the halogen-free flame retardant system provided in the embodiments of this application, the synergistic effect of zirconium hydroxide and dipentaerythritol can better inhibit the precipitation of acidic substances from the halogen-free flame retardant and significantly reduce the amount of mold scale.

[0114] Comparing Examples 3-5, as the amount of zinc borate added increases, the amount of halogen-free flame retardant added can be reduced, which is beneficial to reducing the amount of mold fouling. The effect is small, but it will slightly weaken the mechanical properties. Therefore, the amount of zinc borate added needs to be controlled according to the actual working conditions.

[0115] Comparing Examples 1, 4, and 5, the amount of mold fouling gradually increased with the increase of MPP flame retardant addition, indicating that MPP flame retardant, as the main source of mold fouling, significantly increases the amount of acidic substances precipitated from the flame retardant, leading to a greater amount of mold fouling.

[0116] Compared to Examples 5-6, the addition of zirconium hydroxide and dipentaerythritol reduced the amount of mold fouling due to their synergistic effect. However, compared to Example 3, the amount of mold fouling increased significantly as long as MPP flame retardant was used. This indicates that MPP flame retardant, as a major source of mold fouling, has a significant impact. Only by utilizing the halogen-free flame retardant system provided in this application, reducing the precipitation of flame retardant at its source, and further inhibiting the precipitation of acidic substances through the synergistic effect of zirconium hydroxide and dipentaerythritol, slowing down the heat release rate, and reducing the degradation effect of acidic substances on nylon resin, can the formation of mold fouling be further reduced, achieving the goal of low precipitation and low mold fouling.

[0117] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A flame-retardant nylon material, characterized in that, Based on 100 parts by weight, the flame-retardant nylon material comprises the following components in parts by weight: 40-80 parts of nylon resin; 15-20 parts of halogen-free flame retardant; Synergistic flame retardant 0-5 parts; 0-40 parts glass fiber; 0.1-1.5 parts of acid absorbent; Polyhydroxyl inhibitor 0.1-1.5 parts; The halogen-free flame retardant includes alkyl phosphinate and aluminum phosphite; The acid absorbent is selected from at least one of metal hydroxides, hydrotalcite, zinc stannate, hydroxyapatite, and metal oxides.

2. The flame-retardant nylon material according to claim 1, characterized in that, Based on the mass of the halogen-free flame retardant, the mass percentage of alkyl phosphinate is 70%-90%, and the mass percentage of aluminum phosphite is 10%-30%.

3. The flame-retardant nylon material according to claim 1, characterized in that, In the acid absorbent, the metal hydroxide includes at least one of zirconium hydroxide, magnesium hydroxide, and aluminum hydroxide; The metal oxide includes at least one of zirconium oxide, zinc oxide, aluminum oxide, and magnesium oxide.

4. The flame-retardant nylon material according to claim 1, characterized in that, The synergistic flame retardant is selected from at least one of melamine cyanurate and zinc borate.

5. The flame-retardant nylon material according to claim 1, characterized in that, The alkylphosphinate includes at least one of aluminum diethylphosphinate, sodium diethylphosphinate, and aluminum n-propylphosphinate.

6. The flame-retardant nylon material according to claim 1, characterized in that, The polyhydroxy inhibitor is a polyol, and the polyol is a polyol with not less than four hydroxyl functional groups.

7. The flame-retardant nylon material according to claim 6, characterized in that, Polyols include at least one of pentaerythritol, ethylene glycol, and 1,4-butanediol.

8. The flame-retardant nylon material according to claim 1, characterized in that, The flame-retardant nylon material also includes: 0.1-1 part antioxidant; The antioxidant is selected from at least one of hindered phenolic antioxidants, phosphite antioxidants, and thioether antioxidants.

9. The flame-retardant nylon material according to claim 1, characterized in that, The flame-retardant nylon material also includes: 0.1-1 part of lubricant; The lubricant is selected from at least one of hydrocarbon lubricants, stearic acid soap lubricants, stearic acid ester lubricants, stearic acid amide lubricants, and silicone lubricants.

10. A method for preparing a flame-retardant nylon material, characterized in that, The preparation method includes at least the following steps: The material is provided according to the components and component contents as described in any one of claims 1 to 9; All components except glass fiber are mixed evenly to obtain a premix. The premix and the glass fiber are melt-mixed and extruded to obtain the flame-retardant nylon material.

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