Laser-weldable halogen-free V0 flame-retardant polyamide composite material and preparation method thereof

Abstract

The invention relates to a halogen-free V0 flame-retardant polyamide composite material capable of being subjected to laser welding and a preparation method of the halogen-free V0 flame-retardant polyamide composite material. The invention provides a laser-weldable halogen-free V0 flame-retardant polyamide compound which comprises the following components: polyamide, chopped glass fibers, an antioxidant, an ultraviolet light absorber, a light stabilizer, a dispersing agent and a flame retardant, wherein the flame retardant is selected from two or more of the following components: a flame retardant OP1230, a flame retardant OP1400, a flame retardant CM1014, a flame retardant CM3004, a flame retardant CR-M1631, a flame retardant CR-M1431 and a flame retardant CR-M0431C. The laser-weldable halogen-free V0 flame-retardant polyamide compound disclosed by the invention can realize excellent flame-retardant characteristic and excellent penetration rate, and meets a laser welding scheme of a flame-retardant material.

Description

Technical Field

[0001] The present application relates to the field of polymer materials, and in particular to a laser-weldable halogen-free V0 flame-retardant polyamide composite material and a preparation method thereof. Background Art

[0002] Polyamide, also known as nylon, is a linear thermoplastic polymer engineering plastic with multiple amide repeating units in its molecular backbone. As one of the five major engineering plastics, polyamide boasts numerous excellent properties: high crystallinity, wear resistance, self-lubrication, heat resistance, and good electrical insulation. Polyamide is widely used in the manufacture of various mechanical parts, automotive components, electronic product housings, medical devices, and medical supplies. With the rise of new energy vehicles and the trend toward electrification, polyamide materials with chemical resistance, excellent electrical insulation, and halogen-free flame retardancy are particularly important for core battery, electric drive, and electronic control systems. The development of versatile and versatile flame-retardant systems is a key priority for the future development of flame-retardant nylon materials. The development of V0 flame-retardant reinforced polyamide materials with high transmittance for laser welding is particularly urgent. These materials must meet excellent V0 halogen-free flame retardancy and possess a transmittance greater than 20% (with a wall thickness of 2mm) in the 950nm to 1050nm infrared wavelength range. The laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention has halogen-free V0 flame retardancy, good infrared transmittance, meets CTI 600V (PLC: 0), and has good high temperature and high humidity resistance.

[0003] Chinese invention patent publication number CN117363003A describes a method for preparing and applying a halogen-free flame-retardant polyamide composite. This invention utilizes a special type of DOPO-coated glass fiber in combination with a flame-retardant system to enhance the material's aging resistance and color stability. However, this method reduces the material's transmittance in the visible and infrared wavelengths, making it inadequate for laser welding. Furthermore, DOPO-based glass fiber offers no cost advantages. Therefore, the development of a laser-weldable halogen-free V0 flame-retardant polyamide composite is urgently needed.

[0004] This invention utilizes the unique intermolecular crosslinking of a novel ionic liquid flame retardant to form a novel flame retardant system with traditional nitrogen-phosphorus flame retardants, while reducing phase separation throughout the entire formulation. This allows the reinforced polyamide material to maintain V0 flame retardancy at 0.8mm while also maintaining high transmittance. The V0 flame retardancy is achieved at 0.8mm, with an infrared transmittance of 20% at 960nm and a wall thickness of 2mm, meeting a CTI of 600V. Summary of the Invention

[0005] To address the deficiencies of the prior art, one object of the present invention is to provide a laser-weldable halogen-free V0 flame-retardant polyamide composite material and a preparation method thereof.

[0006] To achieve the above objectives, the present invention provides a laser-weldable halogen-free V0 flame-retardant polyamide composite and a preparation method thereof.

[0007] According to one aspect of the present invention, the laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention can reach 0.8 mm @ V0 grade, infrared 960 nm transmittance: 20% @ wall thickness 2 mm, and meet CTI 600V.

[0008] One aspect of the present invention provides a laser-weldable halogen-free V0 flame-retardant polyamide composite, comprising the following components in parts by weight based on 100 parts by weight:

[0009] 25-65 parts of polyamide

[0010] 20-60 parts of chopped glass fiber

[0011] 0.1-1.0 parts of antioxidant

[0012] 0.1-0.5 parts of ultraviolet light absorber

[0013] 0.1-0.5 parts of light stabilizer

[0014] Dispersant 0.1-0.5 parts

[0015] 10-30 parts of flame retardant,

[0016] The flame retardant comprises two or more selected from the following: flame retardant OP1230, flame retardant OP1400, flame retardant CM1014, flame retardant CM3004, flame retardant CR-M1631, flame retardant CR-M1431, and flame retardant CR-M0431C.

[0017] Another aspect of the present invention provides a method for preparing a laser-weldable halogen-free V0 flame-retardant polyamide composite, comprising the following steps:

[0018] Step 1, preparing raw materials: the raw materials include the following components in parts by weight based on 100 parts by weight of the total:

[0019] 25-65 parts of polyamide

[0020] 20-60 parts of chopped glass fiber

[0021] 0.1-1.0 parts of antioxidant

[0022] 0.1-0.5 parts of ultraviolet light absorber

[0023] 0.1-0.5 parts of light stabilizer

[0024] Dispersant 0.1-0.5 parts

[0025] 10 to 30 parts of flame retardant, wherein the flame retardant includes two or more selected from the following: flame retardant OP1230, flame retardant OP1400, flame retardant CM1014, flame retardant CM3004, flame retardant CR-M1631, flame retardant CR-M1431, flame retardant CR-M0431C,

[0026] Step 2: Mixing and extruding: Mixing and extruding the prepared raw materials.

[0027] Beneficial effects

[0028] The laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention can reach 0.8mm@V0 grade, infrared 960nm transmittance: 20%@wall thickness 2mm, and meet CTI 600V, meeting the application range of halogen-free V0 flame-retardant reinforced polyamide material selection that meets the laser welding solution. DETAILED DESCRIPTION

[0029] The product and method of the present invention are described in more detail below. The present invention is not limited to the following specific embodiments, and other features and advantages of the technical concept of the present invention will also be apparent from the following specific embodiments.

[0030] Regarding definition of terms, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those of ordinary skill in the art. In the event of conflict, this document (including definitions) shall prevail. Preferred methods and materials are described below, but methods and materials similar or equivalent to methods and materials described herein can also be used in practice or testing of the present invention. Materials, methods, and examples disclosed herein are merely illustrative and are not intended to be limiting.

[0031] As used herein, the terms "comprise," "include," "have," "have," "may," "contain," and variations thereof are intended to mean open transitional phrases, terms, or words that do not exclude the presence or addition of one or more additional features, steps, operations, elements, or components. Unless the context clearly indicates otherwise, an object modified by no quantifier includes plural objects. However, whether explicitly stated or not, the present disclosure also includes additional embodiments that "comprise," "consist of," and "consist essentially of" the embodiments or elements shown herein.

[0032] Any range given in absolute terms or approximate terms is intended to include both, and any definition used herein is intended to illustrate rather than limit. Although the numerical ranges and parameters stating the wide range of the present invention are approximate values, the numerical values ​​stated in the specific embodiments are as accurate as possible. However, any numerical value inherently includes some errors that must be caused by the standard deviation found in the measurement of each test. In addition, all ranges disclosed herein are to be understood to include any and all subranges (including all fractions and integers) included therein.

[0033] All ranges and parameters disclosed herein are to be understood to encompass any and all subranges contained therein, and every number between the endpoints. For example, a specified range of "1 to 10" should be considered to include any and all subranges between (and including) a minimum value of 1 and a maximum value of 10; that is, all subranges starting with a minimum value of 1 or greater (e.g., 1 to 6.1) and ending with a maximum value of 10 or less (e.g., 2.3 to 9.4, 3 to 8, 4 to 7), and finally, the individual numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 contained within that range. Unless otherwise indicated, all percentages, ratios, and proportions herein are by weight.

[0034] Furthermore, the present invention encompasses any and all possible combinations of some or all of the various embodiments described herein.Any and all documents cited in this application are hereby incorporated by reference in their entirety.

[0035] The laser-weldable halogen-free V0 flame-retardant polyamide composite according to one embodiment of the present application may include the following components in parts by weight based on 100 parts by weight:

[0036] 25-65 parts of polyamide

[0037] 20-60 parts of chopped glass fiber

[0038] 0.1-1.0 parts of antioxidant

[0039] 0.1-0.5 parts of ultraviolet light absorber

[0040] 0.1-0.5 parts of light stabilizer

[0041] Dispersant 0.1-0.5 parts

[0042] 10-30 parts of flame retardant,

[0043] The flame retardant may include two or more selected from the following: flame retardant OP1230, flame retardant OP1400, flame retardant CM1014, flame retardant CM3004, flame retardant CR-M1631, flame retardant CR-M1431, and flame retardant CR-M0431C.

[0044] According to one embodiment of the present application, the preferred polyamide may be one of PA6, PA66, PA610, PA6I / 6T, PA6T / 6I, PA9T, PA10T, PA12, or a mixture of two thereof, and the Ubbelohde relative viscosity is 2.0 to 3.0 (m-cresol as solvent), preferably 2.5 to 3.0 (m-cresol as solvent).

[0045] According to one embodiment of the present application, the polyamide may more preferably be one of PA6, PA66, PA6I / 6T, PA6T / 6I and PA12, or a mixture of two thereof, and the Ubbelohde relative viscosity is 2.5 to 3.0 (m-cresol is the solvent).

[0046] According to one embodiment of the present application, it is further preferred that the polyamide include PA66 and PA6I / 6T.

[0047] According to one embodiment of the present application, the polyamide content may be 25 to 65 parts based on 100 parts by weight of the polyamide composite. In addition, the polyamide content may be 30 to 60 parts, for example, 35 to 60 parts, preferably 40 to 60 parts, more preferably 45 to 55 parts, further preferably 50 to 55 parts, and even more preferably 52 to 54 parts, based on 100 parts by weight of the polyamide composite.

[0048] According to one embodiment of the present application, based on 100 parts by weight of the polyamide composite, the polyamide may include 15 to 45 parts of PA66 and 10 to 20 parts of PA6I / 6T, preferably 30 to 45 parts of PA66 and 10 to 15 parts of PA6I / 6T, and more preferably 40 to 45 parts of PA66 and 10 to 15 parts of PA6I / 6T.

[0049] According to one embodiment of the present application, the length of the chopped glass fibers may be 3 to 4.5 mm, preferably 3.5 to 4.5 mm, and more preferably 4 to 4.5 mm. According to one embodiment of the present application, the diameter of the chopped glass fibers may be 7 to 15 μm, preferably 8.5 to 15 μm. According to one embodiment of the present application, the cross-section of the chopped glass fibers may be circular and / or elliptical. According to one embodiment of the present application, the cross-section of the chopped glass fibers may be elliptical, and the ratio of the short and long diameters of the ellipse may be 1:3 to 1:5.

[0050] According to one embodiment of the present application, the chopped glass fibers may have a length of 3.5 to 4.5 mm and a diameter of 7 to 15 μm. Preferably, the chopped glass fibers may have a length of 4 to 4.5 mm and a diameter of 8.5 to 15 μm.

[0051] According to one embodiment of the present application, the length of the chopped glass fibers may be 3.5 to 4.5 mm, the diameter may be 7 to 15 μm. According to one embodiment of the present application, the length of the chopped glass fibers may be 3 to 4.5 mm, the diameter may be 7 to 15 μm, and the cross-section may be circular and / or elliptical.

[0052] According to one embodiment of the present application, the length of the chopped glass fibers may be 3 to 4.5 mm, the diameter may be 7 to 15 μm, the cross-section may be elliptical, and the ratio of the short to long diameter of the ellipse may be 1:3 to 1:5. According to one embodiment of the present application, the length of the chopped glass fibers may be 4 to 4.5 mm, the diameter may be 8.5 to 15 μm, the cross-section may be elliptical, and the ratio of the short to long diameter of the ellipse may be 1:3 to 1:5.

[0053] According to one embodiment of the present application, the chopped glass fiber may be in an amount of 20 to 60 parts based on 100 parts by weight of the polyamide composite. In addition, the chopped glass fiber may be in an amount of 25 to 60 parts, for example, 25 to 55 parts, preferably 25 to 50 parts, more preferably 25 to 45 parts, more preferably 25 to 40 parts, and further preferably 25 to 35 parts, based on 100 parts by weight of the polyamide composite.

[0054] According to one embodiment of the present application, the antioxidant may include a primary antioxidant and a secondary antioxidant. Preferably, the weight ratio of the primary antioxidant to the secondary antioxidant may be 1:1 to 10:1, preferably 2:1 to 5:1, and more preferably 2:1 to 4:1. For example, the weight ratio of the primary antioxidant to the secondary antioxidant may be 2:1 to 3:1.

[0055] According to one embodiment of the present application, the primary antioxidant preferably includes a hindered phenol antioxidant. According to one embodiment of the present application, the secondary antioxidant preferably includes a phosphite antioxidant. Preferably, the hindered phenol antioxidant may include 1098: N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide), 1010: Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate. Preferably, the phosphite antioxidant may include 686: Bis(2,4-dicumylphenyl)pentaerythritol diphosphite, 168: Tris(2,4-di-tert-butylphenyl) phosphite.

[0056] According to one embodiment of the present application, the antioxidant may be 0.1 to 1.0 parts based on 100 parts by weight of the polyamide composite. In addition, the antioxidant may be 0.2 to 0.9 parts, for example, 0.3 to 0.8 parts, preferably 0.4 to 0.7 parts, more preferably 0.45 to 0.6 parts, particularly preferably 0.45 to 0.55 parts, for example, 0.5 parts, based on 100 parts by weight of the polyamide composite.

[0057] According to one embodiment of the present application, based on 100 parts by weight of the polyamide composite, the primary antioxidant can be 0.05 to 0.6 parts, for example 0.1 to 0.55 parts, preferably 0.15 to 0.5 parts, more preferably 0.2 to 0.45 parts, particularly preferably 0.3 to 0.4 parts, for example 0.35 parts.

[0058] According to one embodiment of the present application, based on 100 parts by weight of the polyamide composite, the secondary antioxidant may be 0.05 to 0.4 parts, such as 0.1 to 0.3 parts, preferably 0.1 to 0.25 parts, more preferably 0.15 to 0.2 parts, for example 0.15 parts.

[0059] According to one embodiment of the present application, the total amount of the primary antioxidant and the secondary antioxidant may be 0.1 to 1.0 parts based on 100 parts by weight of the polyamide composite. For example, the total amount of the primary antioxidant and the secondary antioxidant may be 0.2 to 0.9 parts, such as 0.3 to 0.8 parts, preferably 0.4 to 0.7 parts, more preferably 0.45 to 0.6 parts, particularly preferably 0.45 to 0.55 parts, for example, 0.5 parts, based on 100 parts by weight of the polyamide composite.

[0060] According to one embodiment of the present application, the antioxidant may include a hindered phenol antioxidant and a phosphite antioxidant, wherein based on 100 parts by weight of the polyamide composite, the hindered phenol antioxidant may be 0.05-0.6 parts, the phosphite auxiliary antioxidant may be 0.05-0.4 parts, preferably the hindered phenol antioxidant is 0.1-0.55 parts, the phosphite auxiliary antioxidant is 0.1-0.3 parts, more preferably the hindered phenol antioxidant is 0.2-0.45 parts, the phosphite auxiliary antioxidant is 0.1-0.25 parts, particularly preferably the hindered phenol antioxidant is 0.3-0.4 parts, the phosphite auxiliary antioxidant is 0.15-0.2 parts, wherein the hindered phenol antioxidant and the phosphite antioxidant can be 0.1-1.0 parts in total, preferably 0.3-0.8 parts, more preferably 0.4-0.7 parts, and particularly preferably 0.45-0.55 parts.

[0061] According to one embodiment of the present application, the preferred ultraviolet light absorber includes 2-(2H-benzotriazole-2)-4,6-bis(1-methyl-1-phenylethyl)-phenol, and more preferably the ultraviolet light absorber is 2-(2H-benzotriazole-2)-4,6-bis(1-methyl-1-phenylethyl)-phenol.

[0062] According to one embodiment of the present application, the amount of the ultraviolet light absorber may be 0.1 to 0.5 parts based on 100 parts by weight of the polyamide composite. In addition, the amount of the ultraviolet light absorber may be 0.125 to 0.4 parts, for example, 0.125 to 0.3 parts, preferably 0.15 to 0.25 parts, and more preferably 0.15 to 0.2 parts, based on 100 parts by weight of the polyamide composite.

[0063] According to one embodiment of the present application, the light stabilizer can be a hindered amine light stabilizer, preferably the hindered amine light stabilizer includes N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-N,N'-dialdehyde hexamethylenediamine, and more preferably the hindered amine light stabilizer is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-N,N'-dialdehyde hexamethylenediamine.

[0064] According to one embodiment of the present application, the light stabilizer may be 0.1 to 0.5 parts based on 100 parts by weight of the polyamide composite. In addition, the light stabilizer may be 0.1 to 0.4 parts, such as 0.1 to 0.3 parts, preferably 0.1 to 0.2 parts, and more preferably 0.1 to 0.15 parts, based on 100 parts by weight of the polyamide composite.

[0065] According to one embodiment of the present application, the dispersant may include stearates and / or polymer ionic liquid complexes. Preferably, the stearates may include magnesium stearate and / or zinc stearate, and preferably, the polyionic liquid complex may include F-S2500. Preferably, the dispersant may include magnesium stearate, zinc stearate, and / or F-S2500.

[0066] According to one embodiment of the present application, the dispersant may be 0.1 to 0.5 parts based on 100 parts by weight of the polyamide composite. In addition, the dispersant may be 0.1 to 0.45 parts based on 100 parts by weight of the polyamide composite, preferably 0.15 to 0.3 parts, and more preferably 0.2 to 0.25 parts.

[0067] According to one embodiment of the present application, the flame retardant can be compounded by a traditional (nitrogen-phosphorus) flame retardant and a novel ionic liquid flame retardant.

[0068] According to one embodiment of the present application, the flame retardant may include a traditional (nitrogen-phosphorus) flame retardant and a novel ionic liquid flame retardant. The flame retardant may include one, two or more traditional (nitrogen-phosphorus) flame retardants and one, two or more novel ionic liquid flame retardants. Preferably, the flame retardant may include one or two traditional (nitrogen-phosphorus) flame retardants and one or two novel ionic liquid flame retardants. For example, the flame retardant may include one traditional (nitrogen-phosphorus) flame retardant and one novel ionic liquid flame retardant; the flame retardant may include one traditional (nitrogen-phosphorus) flame retardant and two novel ionic liquid flame retardants; the flame retardant may include two traditional (nitrogen-phosphorus) flame retardants and one novel ionic liquid flame retardant; the flame retardant may include two traditional (nitrogen-phosphorus) flame retardants and two novel ionic liquid flame retardants.

[0069] According to one embodiment of the present application, the traditional (nitrogen-phosphorus) flame retardants that can be used include: traditional flame retardant OP1230, traditional flame retardant OP1400, traditional flame retardant CM1014, traditional flame retardant CM3004, and the like.

[0070] According to one embodiment of the present application, the novel ionic liquid flame retardant may include: novel ionic liquid flame retardant CR-M1631, novel ionic liquid flame retardant CR-M1431, novel ionic liquid flame retardant CR-M0431C, and the like.

[0071] According to one embodiment of the present application, the flame retardant may include two or more selected from the following: traditional flame retardant OP1230, traditional flame retardant OP1400, traditional flame retardant CM1014, traditional flame retardant CM3004, new ionic liquid flame retardant CR-M1631, new ionic liquid flame retardant CR-M1431, and new ionic liquid flame retardant CR-M0431C.

[0072] According to one embodiment of the present application, the flame retardant may include three or more selected from the following: traditional flame retardant OP1230, traditional flame retardant OP1400, traditional flame retardant CM1014, traditional flame retardant CM3004, new ionic liquid flame retardant CR-M1631, new ionic liquid flame retardant CR-M1431, and new ionic liquid flame retardant CR-M0431C.

[0073] According to one embodiment of the present application, the flame retardant may include two or more selected from the following: traditional flame retardant OP1230, traditional flame retardant OP1400, new ionic liquid flame retardant CR-M1631, and new ionic liquid flame retardant CR-M1431.

[0074] According to one embodiment of the present application, the flame retardant may include three or more selected from the following: traditional flame retardant OP1230, traditional flame retardant OP1400, new ionic liquid flame retardant CR-M1631, and new ionic liquid flame retardant CR-M1431.

[0075] According to one embodiment of the present application, the flame retardant may include one, two or more selected from traditional flame retardant OP1230, traditional flame retardant OP1400, traditional flame retardant CM1014, traditional flame retardant CM3004, and one, two or more selected from new ionic liquid flame retardant CR-M1631, new ionic liquid flame retardant CR-M1431, and new ionic liquid flame retardant CR-M0431C.

[0076] According to one embodiment of the present application, the flame retardant may include one or two selected from traditional flame retardant OP1230, traditional flame retardant OP1400, and one, two or more selected from new ionic liquid flame retardant CR-M1631, new ionic liquid flame retardant CR-M1431, and new ionic liquid flame retardant CR-M0431C.

[0077] According to one embodiment of the present application, the flame retardant may include the traditional flame retardant OP1230, the new ionic liquid flame retardant CR-M1631 and the new ionic liquid flame retardant CR-M1431.

[0078] According to one embodiment of the present application, the flame retardant may include a traditional flame retardant OP1230 and a new ionic liquid flame retardant CR-M1631.

[0079] According to one embodiment of the present application, the flame retardant may include traditional flame retardant OP1230, traditional flame retardant CM1014, new ionic liquid flame retardant CR-M1631 and new ionic liquid flame retardant CR-M1431.

[0080] According to one embodiment of the present application, the flame retardant may include traditional flame retardant OP1230, traditional flame retardant CM3004 and new ionic liquid flame retardant CR-M1631.

[0081] According to one embodiment of the present application, the flame retardant may be 10 to 30 parts based on 100 parts by weight of the polyamide composite. In addition, the flame retardant may be 12 to 25 parts based on 100 parts by weight of the polyamide composite, preferably 15 to 20 parts, and more preferably 16 to 17 parts.

[0082] According to one embodiment of the present application, based on a total of 100% by weight of flame retardant, the flame retardant may include 20% to 90% of traditional (nitrogen-phosphorus) flame retardants and 10% to 80% of the new ionic liquid flame retardant. For example, based on a total of 100% by weight of flame retardant, the traditional (nitrogen-phosphorus) flame retardant may be 25% to 85%, preferably 30% to 80%; the new ionic liquid flame retardant may be 15% to 75%, preferably 20% to 70%. In addition, based on a total of 100% by weight of flame retardant, the traditional (nitrogen-phosphorus) flame retardant may be 30%, may be 50%, may be 60%, may be 80%. In addition, based on a total of 100% by weight of flame retardant, the new ionic liquid flame retardant may be 20%, may be 40%, may be 50%, may be 70%.

[0083] According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 80% of traditional (nitrogen-phosphorus) flame retardants and 20% of the new ionic liquid flame retardant. Based on a total of 100% by weight of the flame retardant, the flame retardant may include 70% of traditional (nitrogen-phosphorus) flame retardants and 30% of the new ionic liquid flame retardant. Based on a total of 100% by weight of the flame retardant, the flame retardant may include 60% of traditional (nitrogen-phosphorus) flame retardants and 40% of the new ionic liquid flame retardant. Based on a total of 100% by weight of the flame retardant, the flame retardant may include 50% of traditional (nitrogen-phosphorus) flame retardants and 50% of the new ionic liquid flame retardant. Based on a total of 100% by weight of the flame retardant, the flame retardant may include 40% of traditional (nitrogen-phosphorus) flame retardants and 60% of the new ionic liquid flame retardant. Based on a total of 100% by weight of the flame retardant, the flame retardant may include 30% of traditional (nitrogen-phosphorus) flame retardants and 70% of the new ionic liquid flame retardant. The flame retardant may include 20% of a conventional (nitrogen-phosphorus) flame retardant and 80% of a novel ionic liquid flame retardant, based on 100% by weight of the total flame retardant.

[0084] According to one embodiment of the present application, two or more novel ionic liquid flame retardants can be included in the compounded flame retardant. When two or more novel ionic liquid flame retardants are included, based on a total of 100% by weight of the flame retardant, each novel ionic liquid flame retardant can be 0% to 60%, as long as the two or more novel ionic liquid flame retardants meet the above weight % range in total. For example, when two or more novel ionic liquid flame retardants are included, based on a total of 100% by weight of the flame retardant, each novel ionic liquid flame retardant can be 5% to 55%, preferably 10% to 50%, as long as the two or more novel ionic liquid flame retardants meet the above weight % range in total. For example, when two or more novel ionic liquid flame retardants are included, based on a total of 100% by weight of the flame retardant, each novel ionic liquid flame retardant can be 0% to 50%, preferably 0% to 40%, more preferably 0% to 30%, as long as the two or more novel ionic liquid flame retardants meet the above weight % range in total.

[0085] According to one embodiment of the present application, when the compounded flame retardant includes two or more novel ionic liquid flame retardants, based on a total of 100% by weight of the flame retardant, one of the novel ionic liquid flame retardants can be 5% to 60%, preferably 10% to 50%, for example, 20% to 40%, and the other novel ionic liquid flame retardant can be 0% to 40%, preferably 0% to 30%, for example, 10% to 20%. When the compounded flame retardant includes two or more novel ionic liquid flame retardants, based on a total of 100% by weight of the flame retardant, one of the novel ionic liquid flame retardants can be 10%, 20%, 40%, or 50%, and the other novel ionic liquid flame retardant can be 10%, 20%, or 30%.

[0086] According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 80% of a traditional (nitrogen-phosphorus) flame retardant, 10% of a new ionic liquid flame retardant and 10% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 70% of a traditional (nitrogen-phosphorus) flame retardant, 15% of a new ionic liquid flame retardant and 15% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 60% of a traditional (nitrogen-phosphorus) flame retardant, 20% of a new ionic liquid flame retardant and 20% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 50% of a traditional (nitrogen-phosphorus) flame retardant, 25% of a new ionic liquid flame retardant and 25% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 40% of a traditional (nitrogen-phosphorus) flame retardant, 30% of a novel ionic liquid flame retardant, and 30% of another novel ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 30% of a traditional (nitrogen-phosphorus) flame retardant, 35% of a novel ionic liquid flame retardant, and 35% of another novel ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 20% of a traditional (nitrogen-phosphorus) flame retardant, 40% of a novel ionic liquid flame retardant, and 40% of another novel ionic liquid flame retardant.

[0087] According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 70% of a traditional (nitrogen-phosphorus) flame retardant, 10% of a new ionic liquid flame retardant and 20% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 60% of a traditional (nitrogen-phosphorus) flame retardant, 10% of a new ionic liquid flame retardant and 30% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 50% of a traditional (nitrogen-phosphorus) flame retardant, 20% of a new ionic liquid flame retardant and 30% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 40% of a traditional (nitrogen-phosphorus) flame retardant, 30% of a new ionic liquid flame retardant and 40% of another new ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 30% of a traditional (nitrogen-phosphorus) flame retardant, 40% of a novel ionic liquid flame retardant, and 30% of another novel ionic liquid flame retardant. According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 20% of a traditional (nitrogen-phosphorus) flame retardant, 30% of a novel ionic liquid flame retardant, and 50% of another novel ionic liquid flame retardant.

[0088] According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 20% to 90% of the traditional flame retardant OP1230, preferably 25% to 85% of the traditional flame retardant OP1230, and more preferably 30% to 80% of the traditional flame retardant OP1230. For example, the flame retardant may include 80% of the traditional flame retardant OP1230, or 60% of the traditional flame retardant OP1230, or 50% of the traditional flame retardant OP1230, or 30% of the traditional flame retardant OP1230.

[0089] According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 20% to 90% of the traditional flame retardant CM3004, preferably 25% to 85% of the traditional flame retardant CM3004, and more preferably 30% to 80% of the traditional flame retardant CM3004. For example, the flame retardant may include 80% of the traditional flame retardant CM3004, or 60% of the traditional flame retardant CM3004, or 50% of the traditional flame retardant CM3004, or 30% of the traditional flame retardant CM3004.

[0090] According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 5% to 60% of the new ionic liquid flame retardant CR-M1631, preferably 10% to 50% of the new ionic liquid flame retardant CR-M1631. For example, the flame retardant may include 10% of the new ionic liquid flame retardant CR-M1631, or 20% of the new ionic liquid flame retardant CR-M1631, or 40% of the new ionic liquid flame retardant CR-M1631, or 50% of the new ionic liquid flame retardant CR-M1631.

[0091] According to one embodiment of the present application, based on a total of 100% by weight of the flame retardant, the flame retardant may include 0% to 40% of the new ionic liquid flame retardant CR-M1431, preferably 0% to 30% of the new ionic liquid flame retardant CR-M1431, for example, the flame retardant may include 30% of the new ionic liquid flame retardant CR-M1431, or 20% of the new ionic liquid flame retardant CR-M1431, or 10% of the new ionic liquid flame retardant CR-M1431.

[0092] According to one embodiment of the present application, the flame retardant may include 80% of the traditional flame retardant OP1230, 10% of the novel ionic liquid flame retardant CR-M1631, and 10% of the novel ionic liquid flame retardant CR-M1431, based on 100% by weight of the flame retardant in total.

[0093] According to one embodiment of the present application, the flame retardant may include 60% of the traditional flame retardant OP1230, 20% of the new ionic liquid flame retardant CR-M1631 and 20% of the new ionic liquid flame retardant CR-M1431, based on 100% by weight of the flame retardant in total.

[0094] According to one embodiment of the present application, the flame retardant may include 30% of the traditional flame retardant OP1230, 40% of the new ionic liquid flame retardant CR-M1631 and 30% of the new ionic liquid flame retardant CR-M1431, based on 100% by weight of the flame retardant in total.

[0095] According to one embodiment of the present application, the flame retardant may include 50% of the traditional flame retardant OP1230 and 50% of the new ionic liquid flame retardant CR-M1631, based on 100% by weight of the flame retardant in total.

[0096] In addition to the above flame retardant combination, there is no limitation on the type and addition ratio of the flame retardant. For example, the type and addition ratio of the flame retardant can be adjusted according to the actual flame retardancy and light transmittance requirements.

[0097] The laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention can be prepared by the following method, comprising the following steps:

[0098] Step 1: Prepare the raw materials: including the above components and weight parts of the raw materials,

[0099] Step 2: Mixing and extruding: Mixing and extruding the prepared raw materials.

[0100] According to one embodiment of the present application, in the above-mentioned mixing and extrusion step, the polyamide, antioxidant, ultraviolet light absorber, light stabilizer, dispersant, and flame retardant are mixed and stirred evenly, and then added to the twin-screw extruder; during the extrusion process of the above-mentioned mixture, the short-cut glass fiber is added to the twin-screw extruder through side feeding and extruded together at high temperature, cooled, pulled and pelletized, and the extrusion temperature is 270°C to 315°C to obtain a laser-weldable halogen-free V0 flame-retardant polyamide composite.

[0101] According to one embodiment of the present application, in the above-mentioned mixing and extrusion step, the extrusion temperature can be, for example, 270°C, 275°C, 280°C, 285°C, 290°C, 295°C, 300°C, 305°C, 310°C, or 315°C.

[0102] The above description of the components (including contents) in the laser-weldable halogen-free V0 flame-retardant polyamide composite is applicable to the components (including contents) in the preparation method.

[0103] The advantages of this invention lie in the following: The laser-weldable halogen-free V0 flame-retardant polyamide composite utilizes the unique intermolecular crosslinking effect of a novel ionic liquid flame retardant, compounded with a traditional nitrogen-phosphorus flame retardant to form a novel flame-retardant system. This significantly limits the migration of small molecule additives and reduces phase separation in the overall formulation, achieving both 0.8mm V0 flame retardancy and high transmittance in the reinforced polyamide material. An optimized composite colorant combination, combined with the following components: polyamide, antioxidant, UV absorber, hindered amine light stabilizer, dispersant, and flame retardant, and carefully selected specific weights, achieves both 0.8mm V0 flame retardancy in the reinforced polyamide material and high transmittance. V0 flame retardancy is achieved at 0.8mm, with an infrared transmittance of 20% at 960nm and a wall thickness of 2mm, meeting a CTI of 600 V. This meets the requirements for laser welding of flame-retardant materials.

[0104] The laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention can be applied to the "three electric" systems of new energy vehicles. It achieves excellent electrical insulation CTI of 600V, meets the fire protection requirements of the halogen-free V0 flame-retardant grade, and meets the material selection requirements for a laser-weldable transparent layer. The laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention can provide a solution to the high fire protection and laser welding material challenges of the "three electric" systems of new energy vehicles, including electric drives, batteries, electronic controls, and their overall vehicle thermal management systems. Furthermore, the material maintains low flame retardant precipitation, maintains high high and low temperature elongation, and significantly improves the material's crack resistance. Example

[0105] The technical scheme of the present invention is described in more detail below in conjunction with specific comparative examples and embodiments. The foregoing can be better understood with reference to the following examples, but the purpose of the embodiments is to illustrate, but not to limit the scope of the invention. In particular, the embodiments illustrate representative embodiments of the inherent principles of the present invention, and these principles are not strictly limited to the specific conditions described in these embodiments. Therefore, it should be understood that the present invention encompasses various changes and modifications to the embodiments described herein and can carry out such changes and modifications without departing from the spirit and scope of the present invention and without reducing its expected advantages. Therefore, it is expected that such changes and modifications are included in the appended claims.

[0106] Comparative Example 1

[0107] The common V0 flame retardant polyamide compound 1 of this comparative example is composed of the following components in parts by weight: 41 parts of polyamide PA66 (U4840NL NC01), 10 parts of polyamide PA6I / 6T (TI1207), 30 parts of chopped glass fiber ( 540H), 0.35 parts of hindered phenolic antioxidant ( 1098), 0.15 parts of phosphite antioxidant ( 686), 0.2 parts of UV absorber ( UV-234), 0.1 parts of light stabilizer ( UV-944), 0.2 parts of dispersant (CMS P-130), and 18 parts of traditional flame retardant OP1230.

[0108] The preparation method of the common V0 flame retardant polyamide compound 1 of this comparative example 1 comprises the following steps:

[0109] Step 1: Mix and stir polyamide PA66, polyamide PA6I / 6T, hindered phenol antioxidant, phosphite antioxidant, ultraviolet light absorber, light stabilizer, dispersant and flame retardant.

[0110] Step 2: Add the mixture obtained in step 1 into a twin-screw extruder. The twin-screw extruder temperature is set to 9 sections, the temperature of the first and second sections is 270 degrees Celsius, and the temperature of the other three sections is 295 degrees Celsius; the main engine speed is 800 rpm, and short glass fibers are added from the side feed during the extrusion process. Finally, the polyamide composite material is extruded, cooled, pulled, and pelletized to obtain the polyamide composite material.

[0111] The obtained materials were dried in a dehumidified dryer at 100 °C for 4 h and then injection molded into test specimens.

[0112] Comparative Example 2

[0113] The common V0 flame retardant polyamide compound 2 of this comparative example is composed of the following components in parts by weight: 41 parts of polyamide PA66 (U4840NL NC01), 11 parts of polyamide PA6I / 6T (TI1207), 30 parts of chopped glass fiber ( 540H), 0.35 parts of hindered phenolic antioxidant ( 1098), 0.15 parts of phosphite antioxidant ( 686), 0.2 parts of UV absorber ( UV-234), 0.1 parts of light stabilizer ( UV-944), 0.2 parts of dispersant (CMS P-130), and 17 parts of traditional flame retardant OP1400.

[0114] The preparation method of the common V0 flame retardant polyamide compound 2 in this comparative example is the same as that of comparative example 1.

[0115] Comparative Example 3

[0116] The common V0 flame retardant polyamide compound 3 of this comparative example is composed of the following components in parts by weight: 41 parts of polyamide PA66 (U4840NL NC01), 11 parts of polyamide PA6I / 6T (TI1207), 30 parts of chopped glass fiber ( 540H), 0.35 parts of hindered phenolic antioxidant ( 1098), 0.15 parts of phosphite antioxidant ( 686), 0.2 parts of UV absorber ( UV-234), 0.1 parts of light stabilizer ( UV-944), 0.2 parts of dispersant (CMS P-130), and 17 parts of new ionic liquid flame retardant CR-M1631.

[0117] The preparation method of the common V0 flame retardant polyamide compound 3 in this comparative example is the same as that of comparative example 1.

[0118] Example 1

[0119] The laser weldable halogen-free V0 flame retardant polyamide composite 1 of this embodiment is composed of the following components in parts by weight: 42 parts of polyamide PA66 (U4840NL NC01), 11 parts of polyamide PA6I / 6T (TI1207), 30 parts of chopped glass fiber ( 540H), 0.35 parts of hindered phenolic antioxidant ( 1098), 0.15 parts of phosphite antioxidant ( 686), 0.2 parts of UV absorber ( UV-234), 0.1 parts of light stabilizer ( UV-944), 0.2 parts of dispersant (CMS P-130), 16 parts of flame retardant (80% traditional flame retardant OP1230, 10% new ionic liquid flame retardant CR-M1631, 10% new ionic liquid flame retardant CR-M1431).

[0120] The preparation method of the laser-weldable halogen-free V0 flame-retardant polyamide composite 1 of the first embodiment is the same as that of the first comparative example.

[0121] Example 2

[0122] The laser weldable halogen-free V0 flame retardant polyamide composite 2 of this embodiment is composed of the following components in parts by weight: 42 parts of polyamide PA66 (U4840NL NC01), 11 parts of polyamide PA6I / 6T (TI1207), 30 parts of chopped glass fiber ( 540H), 0.35 parts of hindered phenolic antioxidant ( 1098), 0.15 parts of phosphite antioxidant ( 686), 0.2 parts of UV absorber ( UV-234), 0.1 parts of light stabilizer ( UV-944), 0.2 parts of dispersant (CMS P-130), 16 parts of flame retardant (60% traditional flame retardant OP1230, 20% new ionic liquid flame retardant CR-M1631, 20% new ionic liquid flame retardant CR-M1431).

[0123] The preparation method of the laser-weldable halogen-free V0 flame-retardant polyamide composite 2 of the second embodiment is the same as that of the first comparative embodiment.

[0124] Example 3

[0125] The laser weldable halogen-free V0 flame retardant polyamide composite 3 of this embodiment is composed of the following components in parts by weight: 42 parts of polyamide PA66 (U4840NL NC01), 11 parts of polyamide PA6I / 6T (TI1207), 30 parts of chopped glass fiber ( 540H), 0.35 parts of hindered phenolic antioxidant ( 1098), 0.15 parts of phosphite antioxidant ( 686), 0.2 parts of UV absorber ( UV-234), 0.1 parts of light stabilizer ( UV-944), 0.2 parts of dispersant (CMS P-130), 16 parts of flame retardant (50% traditional flame retardant OP1230, 50% new ionic liquid flame retardant CR-M1631).

[0126] The preparation method of the laser-weldable halogen-free V0 flame-retardant polyamide composite 3 of the third embodiment is the same as that of the first comparative embodiment.

[0127] Example 4

[0128] The laser weldable halogen-free V0 flame retardant polyamide composite 4 of this embodiment is composed of the following components in parts by weight: 42 parts of polyamide PA66 (U4840NL NC01), 11 parts of polyamide PA6I / 6T (TI1207), 30 parts of chopped glass fiber ( 540H), 0.35 parts of hindered phenolic antioxidant ( 1098), 0.15 parts of phosphite antioxidant ( 686), 0.2 parts of UV absorber ( UV-234), 0.1 parts of light stabilizer ( UV-944), 0.2 parts of dispersant (CMS P-130), 16 parts of flame retardant (30% traditional flame retardant OP1230, 40% new ionic liquid flame retardant CR-M1631, 30% new ionic liquid flame retardant CR-M1431).

[0129] The preparation method of the laser-weldable halogen-free V0 flame-retardant polyamide composite 4 in the fourth embodiment is the same as that in the first comparative embodiment.

[0130] V0 flame retardant polyamide compound performance test

[0131] The performance of the materials obtained in the comparative examples and embodiments was tested and evaluated by the following methods:

[0132] 1) Aging oven: Memmert, flame retardant test equipment ATLAS@HVUL2, CTI: Proof Tracking TesterLDH

[0133] 2) Laser penetration test equipment: TMG 3,980nm

[0134] 3) Universal tensile testing equipment: Z020

[0135] 4) Injection molding test specimens: 80 x 10 x 4 mm ISO 179 test strips; 170 x 20 x 2 mm ISO 179 1A test strips. UL 0.8 mm and 1.6 mm flame retardant test strips.

[0136] 5) Aging conditions include Condition 1: 23°C @ 50% RH, 2000 hours; Condition 2: 70°C @ 62% RH, 2000 hours; and Condition 3: 85°C @ 85% RH, 2000 hours. RH refers to relative humidity.

[0137] Time selection nodes: 50 hours, 500 hours, 1000 hours, 2000 hours.

[0138] The formula for calculating the tensile strength retention is as follows: where all tensile strengths are tensile strength at break;

[0139]

[0140] The following table shows the performance test results of laser-weldable halogen-free V0 flame-retardant polyamide composites of comparative examples and examples:

[0141] Table 1: Data after aging under condition 1: 23°C @ 50% RH, 2000 hours

[0142]

[0143] Table 2: Data after aging under condition 2: 70°C @ 62% RH for 2000 hours

[0144]

[0145] Table 3: Data after aging under condition 3: 85°C @ 85% RH, 2000 hours

[0146]

[0147] Combined with the test results in the table above, it can be seen that the laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention not only achieves V0 flame retardancy at 0.8mm for reinforced polyamide materials, but also maintains high transmittance. V0 flame retardancy is achieved at 0.8mm, with an infrared transmittance of 20% at 960nm and a CTI of 600V at a wall thickness of 2mm. This meets the requirements for laser welding of flame-retardant materials.

[0148] The laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention utilizes a novel ionic liquid flame retardant with unique "intermolecular crosslinking" properties to form a novel flame-retardant system when combined with a traditional nitrogen-phosphorus flame retardant. This significantly limits the migration of small molecule additives and reduces phase separation throughout the entire formulation, enabling the reinforced polyamide material to maintain a 0.8mm V0 flame retardancy while also maintaining high transmittance. The optimized flame retardant combination, combined with the following components: polyamide, antioxidant, UV absorber, hindered amine light stabilizer, and dispersant, and carefully selected specific weights, achieves a V0 flame retardancy of 0.8mm while also maintaining high transmittance. The composite achieves V0 flame retardancy at 0.8mm, infrared transmittance at 980nm: 20%, and a wall thickness of 2mm, meeting a CTI of 600V. This meets the requirements for laser welding of flame-retardant materials.

[0149] Although the present invention can be embodied in many different forms, specific preferred embodiments of the present invention are described in detail herein. This disclosure is an example of the principles of the present invention and is not intended to limit the present invention to the specific embodiments described. In addition, the present invention encompasses any possible combination of some or all of the various embodiments mentioned herein, described herein, and / or incorporated herein. In addition, the present invention encompasses any possible combination of any one or some of the various embodiments mentioned herein, described herein, and / or incorporated herein, which also specifically excludes.

[0150] The above disclosure is intended to be illustrative and not exhaustive. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but may be used in other embodiments and may be combined in other ways even if not specifically shown or described. Such variations are included in the present invention. Based on the description of this specification, a person of ordinary skill in the art may conceive of many changes and alternatives. All of these alternatives and modifications are intended to be included within the scope of the claims. Those familiar with the art may recognize other equivalents of the specific embodiments described herein, which are also intended to be encompassed within the claims.

Claims

1. A laser weldable halogen-free V0 flame-retardant polyamide composite, comprising the following components in parts by weight based on 100 parts by weight: 25-65 parts of polyamide 20-60 parts of chopped glass fiber 0.1-1.0 parts of antioxidant 0.1-0.5 parts of ultraviolet light absorber 0.1-0.5 parts of light stabilizer Dispersant 0.1-0.5 parts 10-30 parts of flame retardant, The flame retardant comprises two or more selected from the following: flame retardant OP1230, flame retardant OP1400, flame retardant CM1014, flame retardant CM3004, flame retardant CR-M1631, flame retardant CR-M1431, and flame retardant CR-M0431C.

2. The polyamide composite according to claim 1, wherein the polyamide is one or a mixture of two of PA6, PA66, PA610, PA6I / 6T, PA6T / 6I, PA9T, PA10T, and PA12, and the Ubbelohde relative viscosity of the polyamide using m-cresol as a solvent is 2.5 to 3.

0. 3 . The polyamide composite according to claim 1 , wherein the chopped glass fibers have a length of 3.5 to 4.5 mm and a diameter of 7 to 15 μm. 4 . The polyamide composite according to claim 1 , wherein the chopped glass fibers have a length of 3 to 4.5 mm, a diameter of 7 to 15 μm, and a circular and / or elliptical cross section. The polyamide composite according to claim 1 , wherein the chopped glass fibers have a length of 3 to 4.5 mm, a diameter of 7 to 15 μm, an elliptical cross section, and a ratio of the short to long diameters of the ellipse of 1:3 to 1:

5.

6. The polyamide composite according to claim 1, wherein the antioxidant comprises a hindered phenol antioxidant and a phosphite antioxidant, wherein the hindered phenol antioxidant comprises N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide) and / or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; and the phosphite antioxidant comprises bis(2,4-dicumylphenyl)pentaerythritol diphosphite and / or tris(2,4-di-tert-butylphenyl) phosphite. 7 . The polyamide composite according to claim 1 , wherein the ultraviolet light absorber comprises 2-(2H-benzotriazole-2)-4,6-bis(1-methyl-1-phenylethyl)-phenol. 8 . The polyamide composite of claim 1 , wherein the light stabilizer comprises N,N′-bis(2,2,6,6-tetramethyl-4-piperidinyl)-N,N′-dialdehyde hexamethylenediamine.

9. The polyamide composite according to claim 1, wherein the dispersant comprises stearates and / or polymer ionic liquid composites, wherein the stearates comprise magnesium stearate and / or zinc stearate, and the polyionic liquid composites comprise F-S2500 composite and / or AF-25.

10. The polyamide composite according to claim 1, wherein the flame retardant comprises: One, two or more selected from flame retardant OP1230, flame retardant OP1400, flame retardant CM1014, flame retardant CM3004, and One, two or more selected from flame retardant CR-M1631, flame retardant CR-M1431, and flame retardant CR-M0431C.

11. The polyamide composite according to claim 1 , wherein the flame retardant comprises: One or two selected from flame retardant OP1230 and flame retardant OP1400, and One, two or more selected from flame retardant CR-M1631, flame retardant CR-M1431, and flame retardant CR-M0431C.

12. The polyamide composite according to claim 1, wherein the flame retardant comprises: Flame retardant OP1230, flame retardant CR-M1631 and flame retardant CR-M1431, or Flame retardant OP1230 and flame retardant CR-M1631.

13. The polyamide composite according to claim 1, wherein the flame retardant comprises 20% to 90% of one, two or more selected from the group consisting of flame retardant OP1230, flame retardant OP1400, flame retardant CM1014, and flame retardant CM3004, and 10% to 80% of one, two or more selected from the group consisting of flame retardant CR-M1631, flame retardant CR-M1431, and flame retardant CR-M0431C, based on 100% by weight of the flame retardant in total. The polyamide composite according to claim 1 , wherein the flame retardant comprises 20% to 90% of flame retardant OP1230, 5% to 60% of flame retardant CR-M1631, and 0% to 40% of flame retardant CR-M1431, based on 100% by weight of the flame retardant in total.

15. A method for preparing a laser-weldable halogen-free V0 flame-retardant polyamide composite, comprising the following steps: Step 1, preparing raw materials: the raw materials include the following components in parts by weight based on 100 parts by weight of the total: 25-65 parts of polyamide 20-60 parts of chopped glass fiber 0.1-1.0 parts of antioxidant 0.1-0.5 parts of ultraviolet light absorber 0.1-0.5 parts of light stabilizer Dispersant 0.1-0.5 parts 10 to 30 parts of flame retardant, wherein the flame retardant includes two or more selected from the following: flame retardant OP1230, flame retardant OP1400, flame retardant CM1014, flame retardant CM3004, flame retardant CR-M1631, flame retardant CR-M1431, flame retardant CR-M0431C, Step 2: Mixing and extruding: Mixing and extruding the prepared raw materials.

16. The method according to claim 15, wherein in the mixed extrusion step, the polyamide, the antioxidant, the ultraviolet light absorber, the light stabilizer, the dispersant and the flame retardant are mixed and stirred uniformly, and then added to a twin-screw extruder; during the extrusion process of the mixed material, the chopped glass fiber is added to the twin-screw extruder by side feeding, and extruded at high temperature, cooled, pulled and pelletized, and the extrusion temperature is 260°C to 315°C to obtain the laser-weldable halogen-free V0 flame-retardant polyamide composite.

17. A laser-weldable halogen-free V0 flame-retardant polyamide composite prepared by the method according to claim 15 or 16.

18. Use of the laser-weldable halogen-free V0 flame-retardant polyamide composite according to any one of claims 1 to 14 in electric drive, battery, electronic control and vehicle thermal management systems of new energy vehicles.

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