Polyamide masterbatch, polyamide composite material and preparation method and application thereof

Abstract

The application discloses a kind of polyamide master batch, polyamide composite material and preparation method and application thereof, belong to high polymer material technical field, including the following weight parts of component: 100 parts first polyamide resin, 2~8 parts polytetrafluoroethylene, 10~20 parts carbon black, 4~12 parts metal salt.The polyamide resin of the application is as matrix, under the joint action of polytetrafluoroethylene, carbon black, metal salt, polyamide master batch with excellent stress whitening resistance is obtained, effectively improve the whitening problem, the polyamide master batch is very suitable for preparing automobile parts, especially suitable for preparing automobile water chamber material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high molecular material, in particular to a kind of polyamide master batch, polyamide composite material and preparation method and application thereof. BACKGROUND

[0002] In recent years, with the rapid development of automobile industry, the demand of engineering materials is increasing, but more application problems are also generated. In addition to basic mechanical performance requirements, the actual performance of materials in application process is also an important problem, which directly determines whether the material can be used.

[0003] In the water chamber material of automobile, glass fiber reinforced nylon is the most common material selection scheme, and glass fiber reinforced nylon needs to be cooled and shaped, and iron plug needs to be inserted into the pipe opening, and then water-cooled, so as to realize rapid shaping. However, due to the insertion of iron plug, the pipe opening of the part is prone to whitening problem. This problem not only affects the appearance of the part, but also determines the acceptance of the customer.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The present application aims at overcoming the deficiencies in the prior art and provides a kind of polyamide master batch, polyamide composite material and preparation method and application thereof, the polyamide master batch has excellent stress whitening resistance, the polyamide master batch is very suitable for preparing automobile parts, especially for preparing automobile water chamber material.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] A kind of polyamide master batch, comprising the following components by weight: 100 parts of first polyamide resin, 2-8 parts of polytetrafluoroethylene, 10-20 parts of carbon black, 4-12 parts of metal salt.

[0008] The present application creatively combines the above raw materials, and the polyamide resin is used as the matrix. Under the joint action of polytetrafluoroethylene, carbon black and metal salt, the polyamide master batch with excellent stress whitening resistance is obtained, which effectively improves the whitening problem. The polyamide master batch is very suitable for preparing automobile parts, especially for preparing automobile water chamber material.

[0009] In the polyamide resin system of the present application, the addition of polytetrafluoroethylene can effectively improve the melt strength, form a dense network structure, improve the energy absorption and stress resistance effect, polytetrafluoroethylene has certain lubricating property, and can improve the fluidity and processing performance of the system, promote the dispersion and filling of other components in the system; carbon black can color the whitening area, reduce the area of the whitening area, and diffuse stress through carbon black when stress is received; the metal salt can improve the crystallinity of the polyamide, reduce the scattering and reflection of the crystal on the optical fiber during whitening, and make it more flexible when receiving external force, not easy to break; the present application utilizes the synergistic effect of polytetrafluoroethylene, carbon black and metal salt, which promotes each other and works together, significantly improving the stress whitening resistance of the polyamide master batch.

[0010] The amount of polytetrafluoroethylene is 2-8 parts, for example, it can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or a range composed of any two of the above values.

[0011] The amount of carbon black is 10-20 parts, for example, it can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts or a range composed of any two of the above values.

[0012] The amount of metal salt is 4-12 parts, for example, it can be 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts or a range composed of any two of the above values.

[0013] In the polyamide master batch of the present application, the weight percentage of the first polyamide resin is not less than 70%.

[0014] Preferably, in the polyamide master batch of the present application, the weight percentage of the first polyamide resin is 70-85%, for example, it can be 70%, 72%, 75%, 76%, 78%, 80%, 82%, 85% or a range composed of any two of the above values.

[0015] Preferably, in the polyamide master batch of the present application, the weight percentage of the first polyamide resin is 74-82%.

[0016] Preferably, the polyamide master batch comprises the following components by weight: 100 parts of the first polyamide resin, 4-6 parts of polytetrafluoroethylene, 12-16 parts of carbon black, and 6-10 parts of metal salt. Especially when the amount of each raw material is in this range, the compatibility is better, the synergistic effect is more obvious, and the stress whitening resistance can be significantly improved.

[0017] Preferably, the average particle size of the polytetrafluoroethylene is 50-300 μm, for example, it can be 50 μm, 60 μm, 70 μm, 80 μm, 100 μm, 120 μm, 150 μm, 200 μm, 220 μm, 250 μm, 300 μm, or a range formed by any two of the above values.

[0018] Preferably, the average particle size of the polytetrafluoroethylene is 100-220 μm.

[0019] The average particle size of the polytetrafluoroethylene is tested according to GB / T 19077.

[0020] Preferably, the iodine adsorption value of the carbon black is 52-180 mg / g, for example, it can be 52 mg / g, 55 mg / g, 60 mg / g, 70 mg / g, 80 mg / g, 100 mg / g, 120 mg / g, 150 mg / g, 160 mg / g, 180 mg / g, or a range formed by any two of the above values.

[0021] Preferably, the iodine adsorption value of the carbon black is 82-92 mg / g.

[0022] The oil absorption value of the carbon black is tested according to the method of ASTM D 1510-19a.

[0023] Preferably, the average particle size of the carbon black is 23-48 nm, for example, it can be 23 nm, 25 nm, 26 nm, 28 nm, 30 nm, 32 nm, 35 nm, 38 nm, 40 nm, 42 nm, 45 nm, 48 nm, or a range formed by any two of the above values.

[0024] Preferably, the specific surface area of the carbon black is 39-133 m 2 / g, 39 m 2 / g, 40 m 2 / g, 50 m 2 / g, 60 m 2 / g, 70 m 2 / g, 80 m 2 / g, 90 m 2 / g, 100 m 2 / g, 110 m 2 / g, 120 m 2 / g, 130 m 2 / g, 133 m 2 / g, or a range formed by any two of the above values.

[0025] The specific surface area of the carbon black is tested according to GB / T 19587-2017.

[0026] Preferably, the average particle size of the carbon black is obtained according to GB / T 19077.

[0027] Preferably, the metal salt comprises at least one of group Ia alkali metal halide salt, wherein the group Ia alkali metal refers to the group Ia alkali metal elements in the periodic table, and specifically includes lithium, sodium, potassium, rubidium, cesium, and francium.

[0028] Preferably, the metal salt comprises at least one of group Ia alkali metal chloride salt and group Ia alkali metal iodide salt, and as examples of the metal salt, specifically can be listed: sodium chloride, potassium chloride, sodium iodide, potassium iodide, lithium chloride, cesium chloride, rubidium chloride, francium chloride, and lithium iodide. Preferably, the metal salt comprises at least one of sodium chloride, potassium chloride, sodium iodide, and potassium iodide.

[0029] Preferably, the first polyamide resin comprises at least one of PA66, PA6, PA610, PA56, PA510, PA612, PA1010, PA1012, PA1212, PA7, PA11, PA12, PA6T, and PA10T.

[0030] Preferably, the relative viscosity of the first polyamide resin is 2.0-3.2 dl / g, for example, can be 2 dl / g, 2.1 dl / g, 2.2 dl / g, 2.3 dl / g, 2.4 dl / g, 2.5 dl / g, 2.6 dl / g, 2.7 dl / g, 2.8 dl / g, 2.9 dl / g, 3 dl / g, 3.1 dl / g, 3.2 dl / g, or a range formed by any two of the above values.

[0031] Preferably, the relative viscosity of the first polyamide resin is 2.7-3 dl / g.

[0032] Preferably, the first polyamide resin comprises at least one of PA66, PA6, PA610, PA56, PA612, and PA1010.

[0033] Preferably, the first polyamide resin comprises at least one of PA66 and PA6.

[0034] The application also provides a preparation method of the polyamide master batch, comprising the following steps:

[0035] According to the proportion, each raw material is weighed and mixed uniformly, then added into a double-screw extruder, and through mixing and melting extrusion granulation, a polyamide master batch is obtained.

[0036] The application also provides an application of the polyamide master batch in preparing automobile parts.

[0037] An automobile part is prepared by using the polyamide master batch.

[0038] The application also provides a polyamide composite material, comprising the following components in parts by weight: 40-90 parts of a second polyamide resin, 5-10 parts of a polyamide masterbatch, 5-50 parts of glass fiber, 0.5-1.5 parts of an auxiliary agent;

[0039] The polyamide masterbatch is the polyamide masterbatch described above.

[0040] Preferably, the average diameter of the glass fiber is 7-13 μm, for example, it can be 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, or a range formed by any two of the above values.

[0041] Preferably, the average length of the glass fiber is 1.5-5 mm, for example, it can be 1.5 mm, 1.8 mm, 2 mm, 3 mm, 4 mm, 5 mm, or a range formed by any two of the above values.

[0042] In the application, the average diameter and average length of the glass fiber are tested by a microscope method: 100 glass fiber samples are placed under a microscope for observation, the diameters and lengths of all the glass fibers in the samples are calculated, and the average values are calculated, i.e. the average diameter and average length of the glass fiber are obtained.

[0043] Preferably, the second polyamide resin comprises at least one of PA66, PA6, PA610, PA56, PA510, PA612, PA1010, PA1012, PA1212, PA7, PA11, PA12, PA6T, and PA10T.

[0044] Preferably, the relative viscosity of the second polyamide resin is 2.0-3.2 dl / g, for example, it can be 2 dl / g, 2.1 dl / g, 2.2 dl / g, 2.3 dl / g, 2.4 dl / g, 2.5 dl / g, 2.6 dl / g, 2.7 dl / g, 2.8 dl / g, 2.9 dl / g, 3 dl / g, 3.1 dl / g, 3.2 dl / g, or a range formed by any two of the above values.

[0045] Preferably, the relative viscosity of the second polyamide resin is 2.7-3 dl / g.

[0046] The test method for the relative viscosity of the first polyamide resin and the second polyamide resin of the application is as follows: the relative viscosity of a nylon resin with a concentration of 0.01 g / dL is measured in 98% concentrated sulfuric acid at 25±0.01 ℃.

[0047] Preferably, the second polyamide resin comprises at least one of PA66, PA6, PA610, PA56, PA612, and PA1010.

[0048] Preferably, the second polyamide resin comprises at least one of PA66, PA6.

[0049] Preferably, the auxiliary agent comprises at least one of an antioxidant, a lubricant.

[0050] Preferably, the polyamide composite material comprises the following components in parts by weight: 40-90 parts of the second polyamide resin, 5-10 parts of the polyamide master batch, 10-35 parts of the glass fiber, 0.4-1 part of the antioxidant, 0.1-0.5 part of the lubricant.

[0051] Preferably, the polyamide composite material comprises the following components in parts by weight: 50-70 parts of the second polyamide resin, 6-8 parts of the polyamide master batch, 15-25 parts of the glass fiber, 0.5-0.8 part of the antioxidant, 0.2-0.4 part of the lubricant.

[0052] In the polyamide composite material of the present application, the weight percentage content of the second polyamide resin is not less than 60%.

[0053] Preferably, in the polyamide composite material of the present application, the weight percentage content of the second polyamide resin is 60-82%, for example, it can be 60%, 62%, 65%, 68%, 70%, 72%, 75%, 76%, 78%, 80%, 82% or a range consisting of any two of the above values.

[0054] Preferably, in the polyamide composite material of the present application, the weight percentage content of the second polyamide resin is 65-72%.

[0055] Preferably, the antioxidant comprises at least one of a sulfur ester antioxidant, a hindered phenol antioxidant, a hydroxylamine antioxidant, a phosphite antioxidant, a phosphate antioxidant.

[0056] Preferably, the sulfur ester antioxidant comprises at least one of a dialkyl thiodipropionate or pentaerythritol tetrakis (3-laurylthiopropionate).

[0057] Preferably, the hindered phenolic antioxidant includes at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol, tris(3,5-di-tert-butyl-4- hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloctadecyl, ethylene bis(oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate], or 3,9-bis[1,1-dimethyl-2-[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane.

[0058] Preferably, the hydroxylamine antioxidant includes bis(octadecyl)hydroxylamine.

[0059] Preferably, the phosphite antioxidant includes at least one of tris(2,4-di-tert- butylphenyl)phosphite, pentaerythritol bisdiphenylphosphite.

[0060] Preferably, the phosphate antioxidant includes bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphate.

[0061] Preferably, the lubricant includes at least one of hyperbranched polyester, stearate, ethylene bis-stearamide, polyethylene wax.

[0062] Preferably, the polyamide composite of the present application can further include at least one of mineral powder, colorant, weathering agent, antistatic agent, flame retardant, ultraviolet light absorber.

[0063] The polyamide masterbatch of the present application can include mineral powder. Suitable mineral powders include, but are not limited to, calcium carbonate, mica, kaolin, magnesium hydroxide, boehmite, and combinations thereof.

[0064] The polyamide composite of the present application can include colorant. Suitable colorants include, but are not limited to, carbon black, titanium dioxide, zinc sulfide, iron red, titanium yellow, and combinations thereof.

[0065] The polyamide composite of the present application can include weathering agent. Suitable weathering agents include, but are not limited to, hindered amine light stabilizers.

[0066] The polyamide composite of the present application can include antistatic agent. Suitable antistatic agents include, but are not limited to, zinc oxide, manganese dioxide, chromium trioxide, and combinations thereof.

[0067] The polyamide composite material described in the present application can include a flame retardant, suitable flame retardants include but are not limited to brominated polymers (for example: brominated polystyrene), metal dialkyl phosphite (for example: aluminum tris (diethyl phosphite)), metal hydroxide (for example: magnesium hydroxide), aromatic phosphate (for example: resorcinol di (diphenyl phosphate) and bisphenol A di (diphenyl phosphate)) and combinations thereof.

[0068] The polyamide composite material described in the present application can include an ultraviolet light absorber, suitable ultraviolet light absorbers include but are not limited to hydroxybenzophenone, benzotriazole, hydroxybenzotriazine, cyanoacrylate, nanoscale inorganic materials (for example: titanium oxide, cerium oxide and zinc oxide) and combinations thereof.

[0069] The present application also provides a method for preparing a polyamide composite material, comprising the following steps:

[0070] According to the proportion, each raw material is weighed, the components except for the glass fiber are uniformly mixed, and the double screw extruder is used for melt mixing, the glass fiber is side fed, melt extrusion granulation is carried out, and the polyamide composite material is obtained.

[0071] The present application also provides a polyamide composite material for preparing an automobile part.

[0072] An automobile part is prepared from the polyamide composite material described above.

[0073] The present application has the beneficial effects that: the polyamide resin is used as a matrix, under the joint action of polytetrafluoroethylene, carbon black and metal salt, a polyamide master batch with excellent stress whitening resistance is obtained, the whitening problem is effectively improved, the polyamide master batch is very suitable for preparing an automobile part, and is especially suitable for preparing an automobile water chamber material. DETAILED DESCRIPTION

[0074] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0075] In the present application, the technical features described in an open manner include both the closed technical solutions composed of the listed features and the open technical solutions containing the listed features.

[0076] In this application, when referring to a numerical interval, unless otherwise specified, the numerical interval is considered to be continuous and includes the minimum and maximum values of the range, as well as every value between the minimum and maximum values. Further, when the range refers to integers, every integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood as including any and all sub-ranges subsumed therein.

[0077] The raw materials used in the examples and comparative examples are described as follows:

[0078] Polyamide resin-1: PA66, relative viscosity of 2.7 dl / g, Huifeng Group, brand EP-158.

[0079] Polyamide resin-2: PA66, relative viscosity of 3 dl / g, Shenma Group, brand EPR27.

[0080] Polyamide resin-3: PA66, relative viscosity of 2 dl / g, Shenma Group, brand EPR20.

[0081] Polyamide resin-4: PA66, relative viscosity of 3.2 dl / g, Shenma Group, brand EPR32.

[0082] Polyamide resin-5: PA6, relative viscosity of 2.8 dl / g, Haiyang Chemical Fiber, brand HY2800.

[0083] Polytetrafluoroethylene was purchased from Dongyue Shenzhou, model DF-102, and was ground and sieved to obtain polytetrafluoroethylene 1-4 with different particle size distributions.

[0084] Polytetrafluoroethylene-1: average particle size of 220 μm.

[0085] Polytetrafluoroethylene-2: average particle size of 100 μm.

[0086] Polytetrafluoroethylene-3: average particle size of 300 μm.

[0087] Polytetrafluoroethylene-4: average particle size of 50 μm.

[0088] Carbon black-1: iodine adsorption value of 92 mg / g, DENKA Company, brand Li-100.

[0089] Carbon black-2: iodine adsorption value of 82 mg / g, DENKA Company, brand Li-250.

[0090] Carbon black-3: iodine adsorption value of 52 mg / g, DENKA Company, brand Li-400.

[0091] Carbon black-4: iodine adsorption value 180 mg / g, DENKA Co., Ltd., trade name Li-435.

[0092] Sodium chloride: conventional commercial.

[0093] Potassium chloride: conventional commercial.

[0094] Iron oxide black: conventional commercial.

[0095] Glass fiber: average diameter 10 um, average length 3 mm, Chongqing Composite, trade name ECS301HP-03-H.

[0096] Antioxidant: mixture of antioxidant 1010 and antioxidant 168, both in a mass ratio of 1:1.

[0097] Lubricant: Wuhan hyperbranched resin, trade name H101.

[0098] Examples 1-15 (polyamide master batches 1-15), Comparative Examples 1-8 (comparative polyamide master batches 1-8)

[0099] The formulations of the polyamide master batches of Examples 1-15 and Comparative Examples 1-8 are shown in Tables 1 and 2 (all in parts by weight).

[0100] The preparation methods of the polyamide master batches of Examples 1-15 and Comparative Examples 1-8 both include the following steps:

[0101] According to the proportions, the raw materials are mixed uniformly and then added to a twin-screw extruder for melt extrusion and granulation to obtain the polyamide master batch. The melt extrusion conditions are: Zone 1 170°C, Zone 2 190°C, Zone 3 230°C, Zone 4 260°C, Zone 5 280°C, Zone 6 280°C, Zone 7 280°C, Zone 8 260°C, Zone 9 260°C; and the screw rotation speed of the twin-screw extruder is 500 r / min.

[0102] Table 1

[0103]

[0104] Table 2

[0105]

[0106]

[0107] Examples 16-33, Comparative Examples 9-16

[0108] The polyamide composite materials of Examples 16-33 and Comparative Examples 9-16 are shown in Tables 3 and 4.

[0109] The preparation method of the polyamide composite materials of Examples 16-33 and Comparative Examples 9-16 comprises the following steps:

[0110] The raw materials were weighed according to the ratio, the components except the glass fiber were mixed uniformly, and were put into a twin-screw extruder for melt mixing. The glass fiber was side-fed, and the melt extrusion granulation was carried out to obtain the polyamide composite material. The processing temperature of each section of the twin-screw extruder was as follows: Zone 1, 170℃; Zone 2, 190℃; Zone 3, 230℃; Zone 4, 260℃; Zone 5, 280℃; Zone 6, 280℃; Zone 7, 280℃; Zone 8, 260℃; and Zone 9, 260℃. The screw rotation speed of the twin-screw extruder was 500r / min.

[0111] Table 3

[0112]

[0113]

[0114] Table 4

[0115]

[0116] Performance test

[0117] Tensile strength: tested according to ISO 527-2-2012, 1A sample, 5mm / min.

[0118] Stress whitening test: the stress whitening resistance performance test was tested according to the German Volkswagen PV3966 standard. The composition was prepared into a standard sample according to the PV3966 standard, and then the test was carried out. The measured stress whitening area diameter d.

[0119] Table 5

[0120]

[0121]

[0122] As can be seen from Table 5, the polyamide master batch described in the application has excellent stress whitening resistance performance. The diameter of the polyamide composite material prepared from the polyamide master batch described in the application in the stress whitening test is ≤4mm, and the tensile strength is ≥163MPa. The polyamide master batch is very suitable for preparing automobile parts, especially for preparing automobile water chamber materials.

[0123] As can be seen from Comparative Example 18 and Examples 20-22, by controlling the raw materials of the polyamide master batch to be: 100 parts of the first polyamide resin, 4-6 parts of polytetrafluoroethylene, 12-16 parts of carbon black, and 6-10 parts of metal salt, the stress whitening resistance performance and the tensile strength are further improved.

[0124] As can be seen from the comparison between Comparative Example 18 and Examples 23-26, the present application further improves the stress whitening resistance and tensile strength by controlling the relative viscosity of the first polyamide resin in the polyamide master batch to be 2.7-3 dl / g.

[0125] As can be seen from the comparison between Comparative Example 18 and Examples 27-29, the present application further improves the stress whitening resistance and tensile strength by controlling the average particle size of the polytetrafluoroethylene to be 100-220 μm.

[0126] As can be seen from the comparison between Comparative Example 18 and Examples 30-32, the present application further improves the stress whitening resistance and tensile strength by controlling the iodine adsorption value of the carbon black to be 82-92 mg / g.

[0127] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. A polyamide masterbatch, characterized in that, The components include the following weight parts: 100 parts of a first polyamide resin, 2-8 parts of polytetrafluoroethylene, 10-20 parts of carbon black, and 4-12 parts of a metal salt. The metal salt is at least one of group Ia alkali metal halide salt.

2. The polyamide masterbatch according to claim 1, characterized in that, The components include the following weight parts: 100 parts of a first polyamide resin, 4-6 parts of polytetrafluoroethylene, 12-16 parts of carbon black, and 6-10 parts of a metal salt.

3. The polyamide masterbatch of claim 1, wherein, The average particle size of the polytetrafluoroethylene is 50-300 μm; and / or The iodine adsorption value of the carbon black is 52-180 mg / g.

4. The polyamide masterbatch of claim 3, wherein, The average particle size of the polytetrafluoroethylene is 100-220 μm.

5. The polyamide masterbatch of claim 3, wherein The iodine adsorption value of the carbon black is 82-92 mg / g.

6. The polyamide masterbatch of claim 1, wherein, The metal salt is at least one of group Ia alkali metal chloride salt and group Ia alkali metal iodide salt; and / or The first polyamide resin includes at least one of PA66, PA6, PA610, PA56, PA510, PA612, PA1010, PA1012, PA1212, PA7, PA11, PA12, PA6T, and PA10T.

7. The polyamide masterbatch of claim 6, wherein, The metal salt is at least one of sodium chloride, potassium chloride, sodium iodide, and potassium iodide.

8. The process for the preparation of polyamide masterbatch according to any one of claims 1 to 7, characterized in that, The method includes the following steps: The raw materials are weighed according to the ratio, mixed uniformly, and then added into a double-screw extruder to be melt-extruded and granulated to obtain polyamide masterbatch.

9. Use of the polyamide masterbatch according to any one of claims 1-7 in the preparation of automobile parts.

10. A polyamide composite, characterized in that, The components include the following weight parts: 40-90 parts of a second polyamide resin, 5-10 parts of polyamide masterbatch, 5-50 parts of glass fiber, and 0.5-1.5 parts of an auxiliary agent. The polyamide masterbatch is the polyamide masterbatch according to any one of claims 1-7.

11. The polyamide composite according to claim 10, characterized in that At least one of the following (a)-(c) is satisfied: (a) The average diameter of the glass fiber is 7-13 μm, and the average length is 1.5-5 mm; (b) The second polyamide resin includes at least one of PA66, PA6, PA610, PA56, PA510, PA612, PA1010, PA1012, PA1212, PA7, PA11, PA12, PA6T, and PA10T; (c) The auxiliary agent includes at least one of an antioxidant and a lubricant.

12. The method of producing a polyamide composite according to any one of claims 10 to 11, characterized in that, The method includes the following steps: The raw materials are weighed according to the ratio, mixed uniformly, and then added into a double-screw extruder to be melt-extruded and granulated to obtain polyamide masterbatch.

13. An automotive part, characterized by The polyamide composite material is prepared by using the polyamide composite material according to any one of claims 10-11.

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