A ablative-resistant polyamide composite material and a preparation method and application thereof

Abstract

The application discloses a kind of ablation-resistant polyamide composite, it is characterized in that, by weight parts, including the following components: polyamide 34-65 parts;Fiber filler 15-55 parts;Flame retardant 1.5-24 parts;Form porcelain filler 2-30 parts;Wherein, the fiber filler is composed of long fiber filler and short fiber filler, by the total weight of fiber filler, long fiber filler accounts for 53-100wt% of the total weight of fiber filler;The porcelain filler is selected from sepiolite, sepiolite and other inorganic filler compound.The ablation-resistant polyamide composite of the application will not be burned through during ablation experiment, and the deformation of the workpiece before and after ablation is small, and has the advantages that the mechanical properties are good.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to an ablation-resistant polyamide composite material, its preparation method, and its application. Background Technology

[0002] Polyamide is a semi-crystalline polymer with numerous hydrogen bonds between its molecular chains, giving it excellent crystallinity, chemical stability, weather resistance, and mechanical properties. Therefore, polyamide is widely used in electronics, automobiles, new energy, and photovoltaics. In recent years, with the explosive growth of new energy vehicles, the requirements for the driving range of power batteries have become increasingly stringent, making lightweighting a trend in new energy vehicle development. The battery pack is a core component of the vehicle, playing a crucial role in supporting and protecting the power battery pack, accounting for 30%-40% of the vehicle's weight. Lightweighting the battery pack is a key approach to vehicle lightweighting and improving driving range. Using composite materials such as low-density engineering plastics like polyamide as the base material and high-strength carbon fiber or glass fiber as reinforcing fillers as the battery casing, replacing traditional metal materials to achieve lightweighting, can reduce the weight of the power battery casing by 20%-30%. Integrated design and significantly shortened processing cycles can substantially reduce costs. However, the fire resistance, ablation resistance, and deformation resistance of polyamide after thermal runaway in the battery pack are crucial factors for its application in the battery pack field.

[0003] Currently, there are few reported cases of ceramicizable, fire-resistant, and ablation-resistant polyamides being used in new energy battery packs. CN117866426A discloses a ceramicizable burn-through resistant polyamide composite material and its preparation method. This patent adds flame retardants, chopped glass fibers, glassy flame-retardant powder, and composite ceramic powder to a polyamide matrix. The low-melting-point glass powder binds calcium silicate and chopped glass fibers during combustion, forming a ceramic structure and improving the material's burn-through time. A 3mm thick sample was burned through in 620-730 seconds in a 1500℃ spray gun test. However, the material eventually burned through, posing a risk of fire spreading to the cockpit after thermal runaway of the battery pack, reducing the probability of successful occupant escape.

[0004] Therefore, developing a polyamide composite material that will not be burned through and will not deform under long-term ablation has great economic value. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical defects and provide an ablation-resistant polyamide composite material that does not burn through in ablation experiments, has small deformation after ablation, and has good mechanical properties.

[0006] This invention is achieved through the following technical solution: An ablation-resistant polyamide composite material, comprising the following components by weight: 34-65 parts of polyamide; 15-55 parts of fiber filler; Flame retardant 1.5-24 parts; 2-30 parts of ceramic filler; The fiber filler is composed of long fiber filler and chopped fiber filler, with long fiber filler accounting for 53-100 wt% of the total weight of the fiber filler. The ceramic-forming filler is selected from at least one of sepiolite and a compound composed of sepiolite and other inorganic fillers.

[0007] Optionally, the other inorganic fillers are selected from at least one of kaolin, wollastonite, low-melting-point glass micro powder, talc, and mica.

[0008] The sepiolite and other inorganic filler compound is selected from at least one of sepiolite / kaolin compound, sepiolite / low melting point glass powder compound, sepiolite / wollastonite compound, sepiolite / kaolin / wollastonite compound, sepiolite / wollastonite / low melting point glass powder compound, and sepiolite / kaolin / low melting point glass powder compound, wherein sepiolite accounts for 10-90 wt% of the compound by weight, preferably 15-30 wt%.

[0009] Preferably, the ceramic filler is selected from at least one of sepiolite and sepiolite / kaolin composite.

[0010] The applicant discovered that although kaolin does not melt during ablation, it may undergo a crystal transformation. Therefore, it is more effective in preventing structural collapse when combined with sepiolite compared to other inorganic fillers.

[0011] Specifically, the sepiolite is selected from at least one of unmodified sepiolite, organically modified sepiolite, and sepiolite crystal inorganic substances; preferably, the sepiolite is selected from organically modified sepiolite. Organically modified sepiolite can be siloxane-modified sepiolite, quaternary ammonium salt-modified sepiolite, etc.

[0012] Sepiolite is a synthetic inorganic compound, also known as artificial sepiolite.

[0013] Specifically, the kaolin is selected from at least one of unmodified kaolin, calcined activated kaolin, and washed kaolin; preferably, the kaolin is selected from washed kaolin. The melting point range of the low-melting-point glass powder is 320-850℃; The average particle size of the ceramic filler ranges from 1.5 to 100 μm, as determined by laser diffraction.

[0014] Preferably, long fiber fillers account for 70-90 wt% of the total weight of fiber fillers. The fiber filler is selected from at least one of glass fiber, carbon fiber, aramid fiber, ceramic fiber, and mineral fiber, preferably at least one of carbon fiber, ceramic fiber, and mineral fiber. The mineral fiber may be at least one of basalt fiber, sepiolite fiber, and asbestos fiber.

[0015] The options are as follows: long fiber filler is a continuous fiber filler with a length range of 7-60mm after impregnation and pelletizing through a die, while short fiber filler has a length range of 1.5-7mm.

[0016] The diameter range of long fiber fillers and chopped fiber fillers is 5-20μm.

[0017] The flame retardant is selected from at least one of hypophosphite flame retardants, phosphite flame retardants, and red phosphorus flame retardants; preferably, the flame retardant is selected from red phosphorus flame retardants.

[0018] The hypophosphite flame retardant is selected from at least one of aluminum dialkylphosphinate and aluminum hypophosphite; the phosphite flame retardant is selected from aluminum phosphite. When hypophosphite flame retardant and phosphite flame retardant are used in combination, the weight ratio of hypophosphite flame retardant to phosphite flame retardant is in the range of (3-4):1.

[0019] The polyamide resin is selected from at least one of aliphatic polyamide, semi-aromatic polyamide, and polylactam; the polylactam is selected from PA6; the aliphatic polyamide is selected from one or more of PA66, PA66 / 6 copolymer, PA6 / 66 copolymer, PA56, PA610, PA612, PA1010, PA1012, PA11, and PA12; the semi-aromatic polyamide is selected from one or more of PA6T / 66, PA9T, PAMXD6, and PA6T / 6I. The relative viscosity range of the polyamide resin of the present invention is 1.5-4.5 dl / g, tested according to GB / T 12006.1.

[0020] The product also includes 0-3 parts by weight of additives, wherein the additives are selected from at least one of antioxidants, lubricants, stabilizers, and colorants. The colorant may be carbon black or aniline black.

[0021] In the ablation-resistant polyamide composite material of the present invention, the polyamide resin accounts for not less than 20 wt% of the total weight of the ablation-resistant polyamide composite material.

[0022] This invention provides a preferred method for preparing an ablation-resistant polyamide composite material, comprising the following steps: Step A: According to the formula, mix 30-70wt% of polyamide, chopped fiber filler, flame retardant and ceramic filler evenly, and extrude and granulate through a twin-screw extruder to obtain reinforced flame retardant ceramic polyamide masterbatch; Step B: The remaining 30-70% of polyamide is extruded through a twin-screw extruder to obtain melt, and then passed through an impregnation die connected to the extruder head. At the same time, the long fiber filler passes through the impregnation die, and is cooled, drawn and pelletized to obtain long fiber filler masterbatch, wherein the length of the long fiber filler in the long fiber filler masterbatch ranges from 7-60mm. Step C: Then mix the reinforced flame-retardant ceramic polyamide masterbatch with the long fiber filler masterbatch to obtain the ablation-resistant polyamide composite material.

[0023] The ablation-resistant polyamide composite material of the present invention will not be burned through during the ablation test, and has small deformation after ablation, high tensile strength and notched impact strength, making it suitable for use in the preparation of electric vehicle battery components.

[0024] The present invention also protects an electric vehicle battery component, including a component made of the above-mentioned ablation-resistant polyamide composite material.

[0025] The present invention has the following beneficial effects: This invention uses long / short glass fibers as the through-network structure of the resin matrix. During ablation, the ceramic filler, mainly composed of sepiolite, melts and bonds the long / short glass fibers and other inorganic fillers with other low-melting-point substances. Under high temperature, Si-O-Si or P-Si-O bonds are formed, ultimately creating a ceramic layer with both macroporous and microporous structures within a dense carbon layer, as well as a carbon layer. This provides thermal insulation and supports the polymer melt during ablation, preventing burn-through. Furthermore, the ablation process maintains the original shape of the part with minimal deformation. Additionally, the high content of long glass fibers significantly improves the mechanical properties of the polyamide composite material. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0027] PA6: HY-2500A, Haiyang Chemical Fiber; PA66: EP158, Huafeng Chemical Co., Ltd.; PA66 / 6: EP26CL, Huafeng Chemical Co., Ltd.; PA9T: GC71010, Jiangsu Boyun Plastics Co., Ltd.; Chopped fiberglass: E7CS10-03-568H, 3mm in length, Jushi Group; Long glass fiber: ER4301H-2400, continuous fiber, Chongqing International; Short-cut carbon fiber: T01A-06B, 6mm in length, Shanghai Muyun New Material Technology Co., Ltd.; Long carbon fiber: SYP 24K, continuous fiber, Jilin Carbon Valley Carbon Fiber Co., Ltd.; Short-cut mineral fiber: Basalt fiber BFCS-13-6, 6mm in length, Zhejiang Shijin Basalt Fiber Co., Ltd. Long mineral fiber: Basalt fiber BCR13-264-101T5, continuous fiber, Zhejiang Shijin Basalt Fiber Co., Ltd.; Short-cut ceramic fiber: SYGX-421, 6mm in length, Shandong Haoyang Energy-Saving Materials Co., Ltd. Long ceramic fiber: Nextel-312, continuous fiber, 3M; Unmodified sepiolite: 200 mesh sepiolite, Nanyang City Wolong District Leibao Sepiolite Processing Co., Ltd.; Organically modified sepiolite A: Addins Clay Fireproof 80T, Tolsa; Organically modified sepiolite B: Addins Clay 80T, Tolsa; Unmodified kaolin: EP CLAY A108, EPChem; Calcinated and activated kaolin: CMP-6, China Kaolin Co., Ltd.; Washed kaolin: POLYFIL HG90, KaMin; Low melting point glass powder: melting point 530℃, G57D, Foshan Taoyiseyou Co., Ltd.; Wollastonite: HQ-1250, Dalian Global Minerals Co., Ltd.; Calcium silicate: Nordkalk C7 (Finland); Aluminum diethylphosphinic acid: OP 1230, Clariant; Aluminum phosphite: Purchased from Hubei Baldi Technology Development Co., Ltd. Red phosphorus flame retardant: Red phosphorus masterbatch FR9950KF, red phosphorus content 50%, Tongcheng Xinde New Materials Co., Ltd.; Aniline black masterbatch: N54 / 1033, from G.R., UK; Antioxidant: RIANOX1098, Rianon; Preparation method of ablation-resistant polyamide composite material in the examples and comparative examples: Step A: According to the formula, 40 wt% of polyamide, chopped glass fiber (if any), flame retardant, and ceramic filler are mixed evenly and extruded and granulated through a twin-screw extruder to obtain reinforced flame-retardant ceramic polyamide masterbatch; Step B: The remaining 60% of polyamide is extruded through a twin-screw extruder to obtain melt, and then passed through an impregnation die connected to the extruder die head. At the same time, the long fiber filler is passed through the impregnation die, cooled, drawn, and pelletized to obtain long fiber filler masterbatch; Step C: The reinforced flame-retardant ceramic polyamide masterbatch is then mixed with the long fiber filler masterbatch to obtain ablation-resistant polyamide composite material.

[0028] Test methods: (1) Ablation resistance test: A 100mm×100mm square plate with a thickness of 2mm was prepared by injection molding. The square plate was placed horizontally, and a spray gun with a flame temperature of about 1500℃ was used to ablate the square plate in the center, directly below, and perpendicular to the plane of the square plate. The ablation was continued for 60 minutes or until it was burned through. The time of burning through was recorded, and the deformation of the square plate was recorded by taking pictures before and after ablation.

[0029] (2) 0.8mm flame retardancy rating test: Prepare UL-94 test strips with a thickness of 0.8mm and test the flame retardancy rating with reference to the UL-94 test standard.

[0030] (3) Tensile strength test: The test shall be conducted in accordance with ISO 527 standard, and the tensile speed shall be 10 mm / min.

[0031] (4) Notched impact strength test of simply supported beam: The test shall be conducted in accordance with ISO 179 standard.

[0032] Table 1: Component content and test results of polyamide composites in Examples 1-7 PA6 34 PA66 45 45 45 45 PA66 / 6 55 PA9T 65 Long glass fiber 10 20 40 45 20 18.6 24.5 Long fiber length (mm) 7 15 40 60 15 15 15 Short-cut glass fiber 5 15 0 10 15 16.4 10.5 Red phosphorus content 1.5 3 3 3 Aluminum diethylphosphite 11.7 15.6 4.7 Aluminum phosphite 3.3 4.4 1.3 Unmodified sepiolite 2 12 4 6 12 12 12 Unmodified kaolin 16 24 Aniline black masterbatch 1 1 - 1 1 1 1 antioxidants - 0.2 0.2 0.2 0.2 0.2 0.2 Flame retardancy (0.8mm) V-2 V-0 V-1 V-0 V-2 V-0 V-0 Has it burned through? no no no no no no no Deformation after ablation (mm) 1.9 0.9 0.6 0.4 1.5 1.5 0.5 Tensile strength (MPa) 135.8 143.4 144.2 158.6 142.7 141.6 147.3 <![CDATA[Notch impact strength kJ / m 2 > 4.1 7.7 7.1 11.7 6.9 7.5 7.9 As can be seen from Examples 2 / 5, when red phosphorus flame retardant is preferred, the flame retardancy is better and the deformation after ablation is smaller.

[0033] As can be seen from Examples 2 / 6 / 7 / 8 / 9, the deformation after ablation is minimized when the preferred ratio of long to short glass fibers is used.

[0034] Table 2: Component content and test results of polyamide composites in Examples 8-13 PA66 45 45 45 45 45 45 Long glass fiber 31.5 35 20 20 20 20 Long fiber length (mm) 15 15 15 15 15 15 Short-cut glass fiber 3.5 0 15 15 15 15 Red phosphorus content 3 3 3 3 3 3 Unmodified sepiolite 12 12 7.2 7.2 Organic modified sepiolite A 12 Organic modified sepiolite B 12 Unmodified kaolin 4.8 Calcination activated kaolin 4.8 Aniline black masterbatch 1 1 1 1 1 1 antioxidants 0.2 0.2 0.2 0.2 0.2 0.2 Flame retardancy (0.8mm) V-0 V-0 V-0 V-0 V-0 V-0 Has it burned through? no no no no no no Deformation after ablation (mm) 0.8 1.1 0.1 0.3 0.7 0.9 Tensile strength (MPa) 154.7 156.8 161.7 167.2 146.8 148.4 <![CDATA[Notch impact strength kJ / m 2 > 9.1 8.5 12.6 13.4 7.1 6.9 As can be seen from Examples 2 / 10 / 11, organically modified sepiolite is preferred.

[0035] As can be seen from Examples 12-14, washed kaolin is preferred.

[0036] Table 3: Component content and test results of polyamide composite materials in Examples 14-19 PA66 45 45 45 45 45 45 Long glass fiber 20 20 20 20 20 20 Long fiber length (mm) 15 15 15 15 15 15 Short-cut glass fiber 15 15 15 15 15 15 Red phosphorus content 3 3 3 3 3 3 Unmodified sepiolite 7.2 7.2 7.2 7.2 7.2 7.2 Unmodified kaolin 2.0 1.8 Washed kaolin 4.8 Wollastonite 4.8 2.8 2.4 Low melting point glass powder 4.8 2.4 3.0 Aniline black masterbatch 1 1 1 1 1 1 antioxidants 0.2 0.2 0.2 0.2 0.2 0.2 Flame retardancy V-0 V-0 V-0 V-0 V-0 V-0 Has it burned through? no no no no no no Deformation after ablation (mm) 0.5 1.4 1.1 1.2 1.0 1.3 Tensile strength (MPa) 153.7 160.3 148.6 150.5 147.5 146.2 <![CDATA[Izod impact strength kJ / m 2 > 7.3 8.6 6.5 6.9 6.7 6.8 As can be seen from Examples 2 / 10-19, when sepiolite or sepiolite / kaolin composite is preferred as the ceramic filler, the deformation after ablation is minimal.

[0037] Table 4: Component content and test results of polyamide composites in Examples 20-27 PA66 45 45 45 45 45 45 45 45 Long glass fiber 20 20 20 20 20 20 20 20 Long fiber length (mm) 15 15 15 15 15 15 15 15 Short-cut glass fiber 15 15 15 15 15 15 15 15 Red phosphorus content 3 3 3 3 3 3 3 3 Unmodified sepiolite 1.2 1.8 3.6 10.8 1.2 1.8 3.6 10.8 Unmodified kaolin 10.8 10.2 8.4 1.2 Wollastonite 5.4 5.1 4.2 0.6 Low melting point glass powder 5.4 5.1 4.2 0.6 Aniline black masterbatch 1 1 1 1 1 1 1 1 antioxidants 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Flame retardancy V-0 V-0 V-0 V-0 V-0 V-0 V-0 V-0 Has it burned through? no no no no no no no no Deformation after ablation (mm) 0.9 0.5 0.3 1.1 1.2 0.7 0.9 1.5 Tensile strength (MPa) 142.7 143.2 146.8 153.5 141.6 142.3 143.5 146.9 <![CDATA[Notch impact strength kJ / m 2 > 6.5 6.4 6.9 7.4 6.3 6.8 7.0 7.1 As can be seen from Examples 12 / 18 / 20-27, sepiolite preferably accounts for 15-30 wt% of the compound.

[0038] Table 5: Component content and test results of polyamide composites in Examples 28-30 PA66 45 45 45 Long carbon fiber 20 Short-cut carbon fiber 15 Long mineral fibers 20 Short-cut mineral fibers 15 Long ceramic fibers 20 Short-cut ceramic fibers 15 Long fiber length (mm) 15 15 15 Red phosphorus content 3 3 3 Unmodified sepiolite 12 12 12 Aniline black masterbatch 1 1 1 antioxidants 0.2 0.2 0.2 Flame retardancy V-0 V-0 V-0 Has it burned through? no no no Deformation after ablation (mm) 0.5 0.6 0.4 Tensile strength (MPa) 201.7 183.5 173.2 <![CDATA[Notch impact strength kJ / m 2 > 11.7 10.6 9.4 As can be seen from Examples 2 / 28 / 29 / 30, the preferred fiber fillers are carbon fiber, mineral fiber, and ceramic fiber, which not only have better mechanical properties but also better resistance to deformation after ablation.

[0039] As can be seen from the above embodiments, the polyamide composite material of the present invention will not be burned through, and the deformation after ablation is small. The tensile strength of the polyamide composite material is >135MPa, and the notched impact strength is >4kJ / m. 2 .

[0040] Table 6: Component content and test results of comparative polyamide composites PA66 45 45 45 45 45 Long glass fiber 15 0 20 20 20 Long fiber length (mm) 15 - 15 15 15 Short-cut glass fiber 20 35 15 15 15 Red phosphorus content 3 3 3 3 3 Unmodified sepiolite 12 12 Unmodified kaolin 4.8 Wollastonite 4.8 Low melting point glass powder 5 7.2 7.2 Calcium silicate 7 Aniline black masterbatch 1 1 1 1 1 antioxidants 0.2 0.2 0.2 0.2 0.2 Flame retardancy V-0 V-0 V-1 V-1 V-1 Has it burned through? no yes yes yes yes burn-through time (min) / 1.5 2.0 2.2 2.8 Deformation after ablation (mm) 6.4 / / / / Tensile strength (MPa) 135.9 133.5 138.6 130.6 128.6 <![CDATA[Notch impact strength kJ / m 2 > 5.8 5.1 5.9 4.9 4.7 As can be seen from Comparative Example 1, if the proportion of long glass fibers is too low, although it is still possible to achieve the characteristic of not burning through, the amount of deformation after ablation is too large.

[0041] As can be seen from Comparative Example 2, if it does not contain long glass fibers, it will be burned through quickly during the ablation process.

[0042] As shown in Comparative Example 3, even conventional ceramic agents composed of low-melting-point glass micropowder / calcium silicate can be burned through.

[0043] As shown in Comparative Example 4 / 5, the ceramic agent made from a mixture of low-melting-point glass micropowder / wollastonite and low-melting-point glass micropowder / kaolin will be burned through.

Claims

1. An ablation-resistant polyamide composite material, characterized in that, By weight, it includes the following components: 34-65 parts of polyamide; 15-55 parts of fiber filler; Flame retardant 1.53-24 parts; 2-30 parts of ceramic filler; The fiber filler is selected from at least one of glass fiber, carbon fiber, aramid fiber, ceramic fiber, and mineral fiber. The fiber filler is composed of long fiber filler and chopped fiber filler. The long fiber filler accounts for 53-90 wt% of the total weight of the fiber filler. The long fiber is a continuous fiber, and the length of the chopped fiber is 1.5-7 mm. The ceramic-forming filler is selected from at least one of sepiolite and a compound composed of sepiolite and other inorganic fillers.

2. The ablation-resistant polyamide composite material according to claim 1, characterized in that, The other inorganic fillers are selected from at least one of kaolin, wollastonite, low-melting-point glass micro powder, talc, and mica.

3. The ablation-resistant polyamide composite material according to claim 2, characterized in that, The aforementioned sepiolite and other inorganic filler compound is selected from at least one of sepiolite / kaolin compound, sepiolite / low melting point glass powder compound, sepiolite / wollastonite compound, sepiolite / kaolin / wollastonite compound, sepiolite / wollastonite / low melting point glass powder compound, and sepiolite / kaolin / low melting point glass powder compound, wherein sepiolite accounts for 10-90 wt% of the compound.

4. The ablation-resistant polyamide composite material according to claim 3, characterized in that, Sepiolite accounts for 15-30 wt% of the compound.

5. The ablation-resistant polyamide composite material according to claim 3, characterized in that, The ceramic filler is selected from at least one of sepiolite and sepiolite / kaolin composite.

6. The ablation-resistant polyamide composite material according to claim 2, characterized in that, The sepiolite is selected from at least one of unmodified sepiolite, organically modified sepiolite, and sepiolite crystal inorganic substances; the kaolin is selected from at least one of unmodified kaolin, calcined activated kaolin, and water-washed kaolin; the melting point of the low-melting-point glass powder is in the range of 320-850℃; and the average particle size of the ceramic filler is in the range of 1.5-100μm.

7. The ablation-resistant polyamide composite material according to claim 6, characterized in that, The sepiolite is selected from organically modified sepiolite, and the kaolin is selected from washed kaolin.

8. The ablation-resistant polyamide composite material according to claim 1, characterized in that, Long fiber fillers account for 70-90 wt% of the total weight of fiber fillers.

9. The ablation-resistant polyamide composite material according to claim 1, characterized in that, The fiber filler is selected from at least one of carbon fiber, ceramic fiber, and mineral fiber.

10. The ablation-resistant polyamide composite material according to claim 1, characterized in that, The flame retardant is selected from at least one of hypophosphite flame retardants, phosphite flame retardants, and red phosphorus flame retardants; the hypophosphite flame retardant is selected from at least one of aluminum dialkylphosphite and aluminum hypophosphite; the phosphite flame retardant is selected from aluminum phosphite; the polyamide resin is selected from at least one of aliphatic polyamide, semi-aromatic polyamide, and polylactam; the polylactam is selected from PA6; the aliphatic polyamide is selected from one or more of PA66, PA66 / 6 copolymer, PA6 / 66 copolymer, PA56, PA610, PA612, PA1010, PA1012, PA11, and PA12; the semi-aromatic polyamide is selected from one or more of PA6T / 66, PA9T, PAMXD6, and PA6T / 6I.

11. The ablation-resistant polyamide composite material according to claim 10, characterized in that, The flame retardant is selected from red phosphorus flame retardants.

12. The ablation-resistant polyamide composite material according to claim 1, characterized in that, The product also includes 0-3 parts by weight of additives, wherein the additives are selected from at least one of antioxidants, lubricants, stabilizers, and colorants.

13. A method for preparing the ablation-resistant polyamide composite material according to any one of claims 1-12, characterized in that, Includes the following steps: Step A: According to the formula, mix 30-70wt% of polyamide, chopped fiber filler, flame retardant and ceramic filler evenly, and extrude and granulate through a twin-screw extruder to obtain reinforced flame retardant ceramic polyamide masterbatch; Step B: The remaining 30-70% of polyamide is extruded through a twin-screw extruder to obtain a melt, which is then passed through an impregnation die connected to the extruder head. At the same time, the long fiber filler passes through the impregnation die, and is cooled, drawn, and pelletized to obtain long fiber filler masterbatch. Step C: Then mix the reinforced flame-retardant ceramic polyamide masterbatch with the long fiber filler masterbatch to obtain the ablation-resistant polyamide composite material.

14. The application of the ablation-resistant polyamide composite material according to any one of claims 1-12, characterized in that, Used in the manufacture of battery components for electric vehicles.

15. A battery component for an electric vehicle, characterized in that, Components made of ablation-resistant polyamide composite material as described in any one of claims 1-12.