A laser weldable halogen-free vo flame retardant polyamide composite material and a method of making the same

Abstract

The present application relates to a kind of laser weldable halogen-free V0 flame-retardant polyamide composite material and its preparation method.The present application provides a kind of laser weldable halogen-free V0 flame-retardant polyamide composite, comprising the following components: polyamide, chopped glass fiber, antioxidant, ultraviolet light absorber, light stabilizer, dispersing agent, 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.The laser weldable halogen-free V0 flame-retardant polyamide composite of the present application can achieve excellent flame-retardant properties, while also achieving excellent transmittance, meet the laser weldable scheme of flame-retardant material.

Description

Technical Field

[0001] This application relates to the field of polymer materials, and in particular to laser-weldable halogen-free VO flame-retardant polyamide composite materials and their preparation methods. Background Technology

[0002] Polyamide, also known as nylon, is a linear thermoplastic engineering plastic with multiple repeating amide units in its molecular backbone. As one of the five major engineering plastics, polyamide possesses 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 towards automotive electrification, the core battery, electric drive, and electronic control systems require polyamide materials with excellent chemical resistance, superior electrical insulation, and halogen-free flame retardancy. Developing multifunctional and diverse flame-retardant systems has become a top priority for the future development of flame-retardant nylon materials. Among these, the development of V0 flame-retardant reinforced polyamide materials with high transmittance for laser welding is urgently needed. This material needs to meet excellent V0 halogen-free flame-retardant properties, with a transmittance greater than 20% in the 950nm~1050nm infrared band (wall thickness 2mm). The laser-weldable halogen-free VO flame-retardant polyamide composite of the present invention has halogen-free VO flame retardancy, good infrared transmittance, meets CTI 600V (PLC: 0), and also has good high temperature and high humidity resistance.

[0003] Chinese invention patent publication CN117363003A describes a method for preparing and applying a halogen-free flame-retardant polyamide composite material. This invention improves the material's aging resistance and color stability by synergistically combining a special type of DOPO-coated glass fiber with a flame-retardant system. However, this method reduces the material's transmittance in the visible and infrared light bands, failing to meet the material selection requirements for laser welding processes. Furthermore, DOPO-type glass fiber lacks cost advantages. Therefore, there is an urgent need to develop a laser-weldable halogen-free VO flame-retardant polyamide composite.

[0004] This invention utilizes a novel ionic liquid flame retardant with a unique intermolecular crosslinking effect to compound with traditional nitrogen-phosphorus flame retardants to form a novel flame retardant system. Simultaneously, it reduces phase separation in the entire formulation system, achieving both 0.8 mm (mm) V0 flame retardancy for reinforced polyamide materials and maintaining high transmittance. Achieving V0 flame retardancy at 0.8 mm, with an infrared 980nm transmittance of 20%, and a wall thickness of 2 mm, meets CTI 600 V. Summary of the Invention

[0005] To address the shortcomings of existing technologies, one objective of this invention is to provide a laser-weldable halogen-free VO flame-retardant polyamide composite material and its preparation method.

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

[0007] According to one aspect of the present invention, the laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention can achieve a V0 rating of 0.8 mm @ V0, an infrared 980nm transmittance of 20% @ wall thickness of 2 mm, and meet CTI 600 V.

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

[0009] 25-65 parts of polyamide

[0010] 20-60 parts of chopped glass fiber

[0011] Antioxidant 0.1 to 1.0 parts

[0012] 0.1 to 0.5 parts of ultraviolet light absorber

[0013] Light stabilizer 0.1 to 0.5 parts

[0014] Dispersant 0.1 to 0.5 parts

[0015] 10-30 parts flame retardant

[0016] The flame retardant mentioned therein 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, and flame retardant CR-M0431C.

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

[0018] Step 1, Prepare raw materials: The raw materials consist of the following components in parts by weight based on a total of 100 parts by weight:

[0019] 25-65 parts of polyamide

[0020] 20-60 parts of chopped glass fiber

[0021] Antioxidant 0.1 to 1.0 parts

[0022] 0.1 to 0.5 parts of ultraviolet light absorber

[0023] Light stabilizer 0.1 to 0.5 parts

[0024] Dispersant 0.1 to 0.5 parts

[0025] 10-30 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: Mix and extrude the prepared raw materials.

[0027] Beneficial effects

[0028] The laser-weldable halogen-free V0 flame-retardant polyamide composite of the present invention can achieve a V0 rating of 0.8 mm @ V0, an infrared 980nm transmittance of 20% @ wall thickness of 2 mm, and meet CTI 600 V, thus satisfying the application range of halogen-free V0 flame-retardant reinforced polyamide materials that are compatible with laser welding schemes. Detailed Implementation

[0029] The products and methods of the present invention will be described in more detail below. The present invention is not limited to the following specific embodiments, and other features and advantages of the inventive concept will become apparent from the following specific embodiments.

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

[0031] As used herein, the terms “comprising,” “including,” “having,” “having,” “may,” “containing,” and variations thereof are intended to refer to 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 explicitly indicates otherwise, objects without quantifiers include plural objects. However, whether explicitly stated or not, this disclosure also includes other embodiments that “include the embodiments or elements shown herein,” “consist of the embodiments or elements shown herein,” and “consist substantially of the embodiments or elements shown herein.”

[0032] Any range given in absolute or approximate terms is intended to include both, and any definitions used herein are intended to be illustrative rather than limiting. While the numerical ranges and parameters stating a wide range of the invention are approximate, the numerical values ​​stated in the specific embodiments are as precise as possible. However, any numerical value inherently includes some error that must be caused by the standard deviation found in the measurements of the respective tests. Furthermore, 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 should be understood to encompass any and all subranges contained therein, and every number between the endpoints. For example, the specified range “1 to 10” should be considered to include any and all subranges between (and including) the minimum value of 1 and the maximum value of 10; that is, all subranges that begin with a minimum value of 1 or greater (e.g., 1 to 6.1) and end 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 stated, all percentages, ratios, and proportions herein are by weight.

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

[0035] According to one embodiment of this application, a laser-weldable halogen-free V0 flame-retardant polyamide composite may comprise, based on a total of 100 parts by weight, the following components in parts by weight:

[0036] 25-65 parts of polyamide

[0037] 20-60 parts of chopped glass fiber

[0038] Antioxidant 0.1 to 1.0 parts

[0039] 0.1 to 0.5 parts of ultraviolet light absorber

[0040] Light stabilizer 0.1 to 0.5 parts

[0041] Dispersant 0.1 to 0.5 parts

[0042] 10-30 parts flame retardant

[0043] The flame retardant may include two or more of 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 this application, the polyamide is preferably one or a mixture of two of PA6, PA66, PA610, PA6I / 6T, PA6T / 6I, PA9T, PA10T, and PA12, and the Ubbelohde relative viscosity is 2.0 to 3.0 (with m-cresol as solvent), preferably 2.5 to 3.0 (with m-cresol as solvent).

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

[0046] According to one embodiment of this application, the polyamide may further preferably include PA66 and PA6I / 6T.

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

[0048] According to one embodiment of this 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, more preferably 40 to 45 parts of PA66 and 10 to 15 parts of PA6I / 6T.

[0049] According to one embodiment of this application, the length of the chopped glass fiber can be 3–4.5 mm, preferably 3.5–4.5 mm, more preferably 4–4.5 mm. According to one embodiment of this application, the diameter of the chopped glass fiber can be 7–15 μm, preferably 8.5–15 μm. According to one embodiment of this application, the cross-section of the chopped glass fiber can be circular and / or elliptical. According to one embodiment of this application, the cross-section of the chopped glass fiber can be elliptical, and the ratio of the shorter to longer diameter of the ellipse can be 1:3 to 1:5.

[0050] According to one embodiment of this application, the length of the chopped glass fiber can be 3.5–4.5 mm, and the diameter can be 7–15 μm. Preferably, the length of the chopped glass fiber can be 4–4.5 mm, and the diameter can be 8.5–15 μm.

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

[0052] According to one embodiment of this application, the chopped glass fiber can be 3–4.5 mm in length, 7–15 μm in diameter, and has an elliptical cross-section with a short-to-long diameter ratio of 1:3 to 1:5. According to another embodiment of this application, the chopped glass fiber can be 4–4.5 mm in length, 8.5–15 μm in diameter, and has an elliptical cross-section with a short-to-long diameter ratio of 1:3 to 1:5.

[0053] According to one embodiment of this application, based on 100 parts by weight of the polyamide composite, the chopped glass fiber can be 20 to 60 parts. Furthermore, based on 100 parts by weight of the polyamide composite, the chopped glass fiber can be 25 to 60 parts, for example 25 to 55 parts, preferably 25 to 50 parts, more preferably 25 to 45 parts, even more preferably 25 to 40 parts, and even more preferably 25 to 35 parts.

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

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

[0056] According to one embodiment of this application, the antioxidant can be 0.1 to 1.0 parts per 100 parts by weight of the polyamide composite. Furthermore, the antioxidant can be 0.2 to 0.9 parts per 100 parts by weight, 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.

[0057] According to one embodiment of this application, based on 100 parts by weight of the polyamide composite, the main 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 this application, based on 100 parts by weight of the polyamide composite, the auxiliary antioxidant can be 0.05 to 0.4 parts, for example 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 this application, based on 100 parts by weight of the polyamide composite, the total amount of the primary antioxidant and the secondary antioxidant can be 0.1 to 1.0 parts. For example, based on 100 parts by weight of the polyamide composite, the total amount of the primary antioxidant and the secondary antioxidant can 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.

[0060] According to one embodiment of this application, the antioxidant may include hindered phenolic antioxidants and phosphite antioxidants, wherein based on 100 parts by weight of the polyamide composite, the hindered phenolic antioxidant may be 0.05-0.6 parts, the phosphite-assisted antioxidant may be 0.05-0.4 parts, preferably 0.1-0.55 parts, the phosphite-assisted antioxidant may be 0.1-0.3 parts, more preferably 0.2-0.45 parts, the phosphite-assisted antioxidant may be 0.1-0.25 parts, particularly preferably 0.3-0.4 parts, and the phosphite-assisted antioxidant may be 0.15-0.2 parts, wherein the total amount of hindered phenolic antioxidants and phosphite antioxidants may be 0.1-1.0 parts, 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 this application, the preferred ultraviolet absorber includes 2-(2H-benzotriazole-2)-4,6-di(1-methyl-1-phenylethyl)-phenol, and more preferably 2-(2H-benzotriazole-2)-4,6-di(1-methyl-1-phenylethyl)-phenol.

[0062] According to one embodiment of this application, the ultraviolet absorber can be 0.1 to 0.5 parts per 100 parts by weight of the polyamide composite. Furthermore, the ultraviolet absorber can be 0.125 to 0.4 parts per 100 parts by weight of the polyamide composite, for example, 0.125 to 0.3 parts, preferably 0.15 to 0.25 parts, and more preferably 0.15 to 0.2 parts.

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

[0064] According to one embodiment of this application, the light stabilizer can be 0.1 to 0.5 parts per 100 parts by weight of the polyamide composite. Furthermore, the light stabilizer can be 0.1 to 0.4 parts per 100 parts by weight, for example, 0.1 to 0.3 parts, preferably 0.1 to 0.2 parts, and more preferably 0.1 to 0.15 parts.

[0065] According to one embodiment of this application, the dispersant may include stearates and / or polyionic liquid complexes. Preferably, the stearates may include magnesium stearate and / or zinc stearate, and 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 this application, the dispersant can be 0.1 to 0.5 parts per 100 parts by weight of the polyamide composite. Furthermore, the dispersant can be 0.1 to 0.45 parts per 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 this application, the flame retardant can be compounded from a conventional (nitrogen-phosphorus) flame retardant and a novel ionic liquid flame retardant.

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

[0069] According to one embodiment of this application, conventional (nitrogen-phosphorus) flame retardants may include: conventional flame retardant OP1230, conventional flame retardant OP1400, conventional flame retardant CM1014, conventional flame retardant CM3004, etc.

[0070] According to one embodiment of this application, the novel ionic liquid flame retardant can be: novel ionic liquid flame retardant CR-M1631, novel ionic liquid flame retardant CR-M1431, novel ionic liquid flame retardant CR-M0431C, etc.

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

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

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

[0074] According to one embodiment of this application, the flame retardant may include three or more of the following: conventional flame retardant OP1230, conventional flame retardant OP1400, novel ionic liquid flame retardant CR-M1631, and novel ionic liquid flame retardant CR-M1431.

[0075] According to one embodiment of this application, the flame retardant may include one, two or more of the following traditional flame retardants: OP1230, OP1400, CM1014, and CM3004; and one, two or more of the following novel ionic liquid flame retardants: CR-M1631, CR-M1431, and CR-M0431C.

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

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

[0078] According to one embodiment of this application, the flame retardant may include the conventional flame retardant OP1230 and the novel ionic liquid flame retardant CR-M1631.

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

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

[0081] According to one embodiment of this application, the flame retardant can be 10 to 30 parts per 100 parts by weight of the polyamide composite. Furthermore, the flame retardant can be 12 to 25 parts per 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 this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 20% to 90% conventional (nitrogen-phosphorus) flame retardant and 10% to 80% novel ionic liquid flame retardant. For example, based on a total weight of 100% flame retardant, the conventional (nitrogen-phosphorus) flame retardant may be 25% to 85%, preferably 30% to 80%; and the novel ionic liquid flame retardant may be 15% to 75%, preferably 20% to 70%. Furthermore, based on a total weight of 100% flame retardant, the conventional (nitrogen-phosphorus) flame retardant may be 30%, 50%, 60%, or 80%. Furthermore, based on a total weight of 100% flame retardant, the novel ionic liquid flame retardant may be 20%, 40%, 50%, or 70%.

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

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

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

[0086] According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 80% conventional (nitrogen-phosphorus) flame retardant, 10% of a novel ionic liquid flame retardant, and 10% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 70% conventional (nitrogen-phosphorus) flame retardant, 15% of a novel ionic liquid flame retardant, and 15% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 60% conventional (nitrogen-phosphorus) flame retardant, 20% of a novel ionic liquid flame retardant, and 20% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 50% conventional (nitrogen-phosphorus) flame retardant, 25% of a novel ionic liquid flame retardant, and 25% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may include 40% conventional (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 this application, based on a total weight of 100% flame retardant, the flame retardant may include 30% conventional (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 this application, based on a total weight of 100% flame retardant, the flame retardant may include 20% conventional (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 this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 70% conventional (nitrogen-phosphorus) flame retardant, 10% of a novel ionic liquid flame retardant, and 20% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 60% conventional (nitrogen-phosphorus) flame retardant, 10% of a novel ionic liquid flame retardant, and 30% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 50% conventional (nitrogen-phosphorus) flame retardant, 20% of a novel ionic liquid flame retardant, and 30% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may comprise 40% conventional (nitrogen-phosphorus) flame retardant, 30% of a novel ionic liquid flame retardant, and 40% of another novel ionic liquid flame retardant. According to one embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may include 30% conventional (nitrogen-phosphorus) flame retardant, 40% of a novel ionic liquid flame retardant, and 30% of another novel ionic liquid flame retardant. According to another embodiment of this application, based on a total weight of 100% flame retardant, the flame retardant may include 20% conventional (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 this application, based on a total of 100% by weight of flame retardant, the flame retardant may include 20% to 90% conventional flame retardant OP1230, preferably 25% to 85% conventional flame retardant OP1230, more preferably 30% to 80% conventional flame retardant OP1230. For example, the flame retardant may include 80% conventional flame retardant OP1230, or 60% conventional flame retardant OP1230, or 50% conventional flame retardant OP1230, or 30% conventional flame retardant OP1230.

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

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

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

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

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

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

[0095] According to one embodiment of this application, based on a total of 100% by weight of flame retardant, the flame retardant may include 50% of the conventional flame retardant OP1230 and 50% of the novel ionic liquid flame retardant CR-M1631.

[0096] Besides the above-mentioned combination of flame retardants, there are no restrictions on the type and proportion of flame retardants. For example, the type and proportion of flame retardants can be adjusted according to actual flame retardancy and light transmittance requirements.

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

[0098] Step 1: Prepare raw materials: including the aforementioned components and their respective weight proportions.

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

[0100] According to one embodiment of this application, in the above-mentioned mixed extrusion step, polyamide, antioxidant, ultraviolet light absorber, light stabilizer, dispersant, and flame retardant are mixed and stirred evenly, and then added to a twin-screw extruder; during the extrusion process of the above mixture, chopped glass fibers are added to the twin-screw extruder by side feeding and extruded together at high temperature, cooled, drawn and pelletized, with an extrusion temperature of 270℃~315℃, to obtain a laser-weldable halogen-free VO flame-retardant polyamide composite.

[0101] According to one embodiment of this application, in the above-mentioned mixing 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 content) in the laser-weldable halogen-free V0 flame-retardant polyamide composite applies to the components (including content) in the preparation method.

[0103] The advantages of this invention are as follows: The laser-weldable halogen-free V0 flame-retardant polyamide composite of this invention utilizes the unique "intermolecular cross-linking" effect of a novel ionic liquid flame retardant, combined with traditional nitrogen-phosphorus flame retardants to form a novel flame-retardant system. The migration of small molecule additives is significantly restricted, while phase separation in the entire formulation system is reduced. This achieves both 0.8mm V0 flame retardancy for the reinforced polyamide material and high transmittance. The optimized compound colorant combination is compounded with the following components: polyamide, antioxidant, ultraviolet absorber, hindered amine light stabilizer, dispersant, and flame retardant. By rationally selecting specific weights, this achieves both 0.8mm V0 flame retardancy for the reinforced polyamide material and high transmittance. A V0 flame retardancy result is achieved at 0.8mm, with an infrared 980nm transmittance of 20%, a wall thickness of 2mm, and compliance with CTI 600 V. This satisfies the requirements for laser-welded flame-retardant materials.

[0104] The laser-weldable halogen-free V0 flame-retardant polyamide composite of this invention can be applied to the "three-electric" systems of new energy vehicles. It meets excellent electrical insulation requirements (CTI 600V), satisfies the fire resistance requirements of halogen-free flame retardant V0 rating, and is suitable for laser-weldable through-layer material selection. This laser-weldable halogen-free V0 flame-retardant polyamide composite can solve the challenges of high fire resistance and laser welding materials in the "three-electric" systems of new energy vehicles, including electric drive, battery, electronic control, and the vehicle's thermal management system. Simultaneously, this material maintains low flame retardant release, high high and low temperature elongation retention, and significantly improves the material's crack resistance.

[0105] Example

[0106] The technical solution of the present invention will be described in more detail below with reference to specific comparative examples and embodiments. The above content can be better understood by referring to the following embodiments, but the embodiments are intended to be illustrative and not to limit the scope of the invention. In particular, the embodiments illustrate representative embodiments of the inherent principles of the 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 covers various changes and modifications to the embodiments described herein, and such changes and modifications can be made without departing from the spirit and scope of the invention and without diminishing its intended advantages. Therefore, such changes and modifications are contemplated to be included in the appended claims.

[0107] Comparative Example 1

[0108] The ordinary V0 flame-retardant polyamide composite 1 in this comparative example is composed of the following components in parts by weight: 41 parts polyamide PA66 (U4840NL NC01), 10 parts polyamide PA6I / 6T (TI1207), and 30 parts chopped glass fiber (JUSHI). ® 540H), 0.35 parts hindered phenolic antioxidant (RIANOX) ® 1098), 0.15 parts of phosphite antioxidant (RIANOX) ® 686), 0.2 parts of ultraviolet light absorber (RIASORB) ® UV-234), 0.1 parts light stabilizer (RIASORB) ® UV-944), 0.2 parts dispersant (CMSP-130), and 18 parts conventional flame retardant OP1230.

[0109] The preparation method of the ordinary V0 flame-retardant polyamide composite 1 in Comparative Example 1 includes the following steps:

[0110] Step 1: Mix polyamide PA66, polyamide PA6I / 6T, hindered phenolic antioxidant, phosphite antioxidant, ultraviolet absorber, light stabilizer, dispersant, and flame retardant until homogeneous.

[0111] Step 2: Add the mixture obtained in Step 1 into a twin-screw extruder. The twin-screw extruder has a total of 9 temperature 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 machine speed is 800 rpm. Short glass fibers are added from the side feed during the extrusion process. Finally, after extrusion, cooling, traction, and pelletizing, the polyamide composite material is obtained.

[0112] The obtained material was dried at 100 degrees Celsius for 4 hours in a dehumidifying dryer, and then injection molded into test samples.

[0113] Comparative Example 2

[0114] The ordinary V0 flame-retardant polyamide composite 2 in this comparative example is composed of the following components in parts by weight: 41 parts polyamide PA66 (U4840NL NC01), 11 parts polyamide PA6I / 6T (TI1207), and 30 parts chopped glass fiber (JUSHI). ® 540H), 0.35 parts hindered phenolic antioxidant (RIANOX) ® 1098), 0.15 parts of phosphite antioxidant (RIANOX) ® 686), 0.2 parts of ultraviolet light absorber (RIASORB) ® UV-234), 0.1 parts light stabilizer (RIASORB) ® UV-944), 0.2 parts dispersant (CMSP-130), and 17 parts conventional flame retardant OP1400.

[0115] The preparation method of the ordinary V0 flame-retardant polyamide composite 2 in this comparative example is the same as that in comparative example 1.

[0116] Comparative Example 3

[0117] The ordinary V0 flame-retardant polyamide composite 3 in this comparative example is composed of the following components in parts by weight: 41 parts polyamide PA66 (U4840NL NC01), 11 parts polyamide PA6I / 6T (TI1207), and 30 parts chopped glass fiber (JUSHI). ® 540H), 0.35 parts hindered phenolic antioxidant (RIANOX) ® 1098), 0.15 parts of phosphite antioxidant (RIANOX) ® 686), 0.2 parts of ultraviolet light absorber (RIASORB) ® UV-234), 0.1 parts light stabilizer (RIASORB) ® UV-944), 0.2 parts dispersant (CMSP-130), and 17 parts novel ionic liquid flame retardant CR-M1631.

[0118] The preparation method of the ordinary V0 flame-retardant polyamide composite 3 in this comparative example is the same as that in comparative example 1.

[0119] Example 1

[0120] 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 polyamide PA66 (U4840NL NC01), 11 parts polyamide PA6I / 6T (TI1207), and 30 parts chopped glass fiber (JUSHI). ® 540H), 0.35 parts hindered phenolic antioxidant (RIANOX) ® 1098), 0.15 parts of phosphite antioxidant (RIANOX) ® 686), 0.2 parts of ultraviolet light absorber (RIASORB) ® UV-234), 0.1 parts light stabilizer (RIASORB) ® UV-944), 0.2 parts dispersant (CMS P-130), 16 parts flame retardant (80% traditional flame retardant OP1230, 10% novel ionic liquid flame retardant CR-M1631, 10% novel ionic liquid flame retardant CR-M1431).

[0121] The preparation method of the laser-weldable halogen-free VO flame-retardant polyamide composite 1 in this embodiment is the same as that in Comparative Example 1.

[0122] Example 2

[0123] 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 polyamide PA66 (U4840NL NC01), 11 parts polyamide PA6I / 6T (TI1207), and 30 parts chopped glass fiber (JUSHI). ® 540H), 0.35 parts hindered phenolic antioxidant (RIANOX) ® 1098), 0.15 parts of phosphite antioxidant (RIANOX) ® 686), 0.2 parts of ultraviolet light absorber (RIASORB) ® UV-234), 0.1 parts light stabilizer (RIASORB) ® UV-944), 0.2 parts dispersant (CMS P-130), 16 parts flame retardant (60% conventional flame retardant OP1230, 20% novel ionic liquid flame retardant CR-M1631, 20% novel ionic liquid flame retardant CR-M1431).

[0124] The preparation method of the laser-weldable halogen-free V0 flame-retardant polyamide composite 2 in this embodiment is the same as that in comparative example 1.

[0125] Example 3

[0126] 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 polyamide PA66 (U4840NL NC01), 11 parts polyamide PA6I / 6T (TI1207), and 30 parts chopped glass fiber (JUSHI). ® 540H), 0.35 parts hindered phenolic antioxidant (RIANOX) ® 1098), 0.15 parts of phosphite antioxidant (RIANOX) ® 686), 0.2 parts of ultraviolet light absorber (RIASORB) ® UV-234), 0.1 parts light stabilizer (RIASORB) ® UV-944), 0.2 parts dispersant (CMS P-130), 16 parts flame retardant (50% traditional flame retardant OP1230, 50% novel ionic liquid flame retardant CR-M1631).

[0127] The preparation method of the laser-weldable halogen-free V0 flame-retardant polyamide composite 3 in this embodiment is the same as that in comparative example 1.

[0128] Example 4

[0129] 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 polyamide PA66 (U4840NL NC01), 11 parts polyamide PA6I / 6T (TI1207), and 30 parts chopped glass fiber (JUSHI). ® 540H), 0.35 parts hindered phenolic antioxidant (RIANOX) ® 1098), 0.15 parts of phosphite antioxidant (RIANOX) ® 686), 0.2 parts of ultraviolet light absorber (RIASORB) ® UV-234), 0.1 parts light stabilizer (RIASORB) ® UV-944), 0.2 parts dispersant (CMS P-130), 16 parts flame retardant (30% conventional flame retardant OP1230, 40% novel ionic liquid flame retardant CR-M1631, 30% novel ionic liquid flame retardant CR-M1431).

[0130] The preparation method of the laser-weldable halogen-free V0 flame-retardant polyamide composite 4 in Example 4 is the same as that in Comparative Example 1.

[0131] Performance testing of V0 flame-retardant polyamide composite

[0132] The properties of the materials obtained in the comparative examples and embodiments were tested and evaluated using the following methods:

[0133] 1) Aging oven: Memmert, flame retardant testing equipment ATLAS @ HVUL2, CTI: Proof Tracking Tester LDH

[0134] 2) Laser transmittance testing equipment: LPKF ® TMG 3, 980nm

[0135] 3) Universal tensile testing equipment: Zwick ® Z020

[0136] 4) Injection molded test specimens: 80 x 10 x 4mm template, ISO 179 specimen; 170 x 20 x 2mm ISO 179 1A specimen. UL 0.8mm and 1.6mm flame retardant test specimens.

[0137] 5) Aging conditions include: Condition 1: 23℃@50%RH, 2000 hours; Condition 2: 70℃@62%RH, 2000 hours; Condition 3: 85℃@85%RH, 2000 hours. RH refers to relative humidity.

[0138] Time selection nodes: 50 hours, 500 hours, 1000 hours, 2000 hours.

[0139] The formula for calculating the tensile strength retention rate is as follows: where all tensile strengths refer to the tensile strength at break;

[0140] .

[0141] The table below shows the performance test results of the laser-weldable halogen-free V0 flame-retardant polyamide composites of the comparative examples and embodiments:

[0142] Table 1: Data after aging under condition 1: 23℃@50%%RH, 2000 hours

[0143]

[0144] Table 2: Data after aging under condition 2: 70℃@62% RH 2000 hours

[0145]

[0146] Table 3: Data after aging under condition 3: 85℃@85%RH, 2000 hours

[0147]

[0148] Based on 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 achieves both 0.8mm V0 flame retardancy for the reinforced polyamide material and high transmittance. Achieving V0 flame retardancy at 0.8mm, with an infrared 980nm transmittance of 20%, and a wall thickness of 2mm, meets CTI 600 V. This satisfies the requirements for laser-welded flame-retardant materials.

[0149] This invention relates to a laser-weldable halogen-free V0 flame-retardant polyamide composite. By utilizing the unique intermolecular cross-linking effect of a novel ionic liquid flame retardant, it is combined with traditional nitrogen-phosphorus flame retardants to form a novel flame-retardant system. The migration of small molecule additives is significantly restricted, while phase separation in the overall formulation is reduced. This achieves both 0.8mm V0 flame retardancy for the reinforced polyamide material and high transmittance. The optimized combination of flame retardants is formulated with the following components: polyamide, antioxidant, UV absorber, hindered amine light stabilizer, and dispersant. Specific weights are carefully selected to achieve both 0.8mm V0 flame retardancy and high transmittance for the reinforced polyamide material. A V0 flame retardancy result is achieved at 0.8mm, with an infrared 980nm transmittance of 20%, a wall thickness of 2mm, and compliance with CTI 600 V. This satisfies the requirements for laser-welded flame-retardant materials.

[0150] Although the invention can be embodied in many different forms, specific preferred embodiments of the invention are described in detail herein. This disclosure is an example of the principles of the invention and is not intended to limit the invention to the specific embodiments described. Furthermore, the invention covers any possible combination of some or all of the various embodiments mentioned herein, described herein, and / or incorporated herein. In addition, the invention also specifically excludes any possible combination of any or some of the various embodiments mentioned herein, described herein, and / or incorporated herein.

[0151] The foregoing 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 this invention. Based on the description herein, many modifications and alternatives will be conceived by those skilled in the art. All such alternatives and modifications are intended to be included within the scope of the claims. Those skilled in the art will recognize other equivalents of the specific embodiments described herein, which are also intended to be covered by the claims.

Claims

1. A laser-weldable halogen-free V0 flame-retardant polyamide composite, comprising, based on 100 parts by weight, the following components in parts by weight: 25-65 parts of polyamide 20-60 parts of chopped glass fiber Antioxidant 0.1 to 1.0 parts 0.1 to 0.5 parts of ultraviolet light absorber Light stabilizer 0.1 to 0.5 parts Dispersant 0.1 to 0.5 parts 10-30 parts flame retardant The flame retardant mentioned above includes: Selected from one or both of flame retardants OP1230 and OP1400, and It is selected from one or both of flame retardants CR-M1631 and CR-M1431.

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 with m-cresol as 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.

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

5.

6. The polyamide composite according to claim 1, wherein the antioxidant comprises a hindered phenolic antioxidant and a phosphite antioxidant, wherein the hindered phenolic antioxidant comprises N,N'-hexamethylene bis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide) and / or tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester; 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 absorber comprises 2-(2H-benzotriazole-2)-4,6-di(1-methyl-1-phenylethyl)-phenol.

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

10. The polyamide composite of claim 1, wherein the flame retardant comprises: Flame retardants OP1230, CR-M1631, and CR-M1431, or Flame retardant OP1230 and flame retardant CR-M1631.

11. The polyamide composite according to claim 1, wherein, based on a total of 100% by weight of flame retardant, the flame retardant comprises 20% to 90% of one or two selected from flame retardant OP1230 and flame retardant OP1400, and 10% to 80% of one or two selected from flame retardant CR-M1631 and flame retardant CR-M1431.

12. The polyamide composite of claim 1, wherein, based on a total of 100% by weight of flame retardant, the flame retardant comprises 20% to 90% flame retardant OP1230, 5% to 60% flame retardant CR-M1631 and 0% to 40% flame retardant CR-M1431.

13. A method for preparing a laser-weldable halogen-free V0 flame-retardant polyamide composite, comprising the following steps: Step 1, Prepare raw materials: The raw materials consist of the following components in parts by weight based on a total of 100 parts by weight: 25-65 parts of polyamide 20-60 parts of chopped glass fiber Antioxidant 0.1 to 1.0 parts 0.1 to 0.5 parts of ultraviolet light absorber Light stabilizer 0.1 to 0.5 parts Dispersant 0.1 to 0.5 parts 10-30 parts of flame retardant, wherein the flame retardant comprises: Selected from one or both of flame retardants OP1230 and OP1400, and Selected from one or both of flame retardants CR-M1631 and CR-M1431. Step 2, Mixed Extrusion: Mix and extrude the prepared raw materials.

14. The method according to claim 13, wherein in the mixing extrusion step, the polyamide, the antioxidant, the ultraviolet absorber, the light stabilizer, the dispersant, and the flame retardant are mixed and stirred evenly, and then added to a twin-screw extruder; during the extrusion process of the mixture, the chopped glass fibers are added to the twin-screw extruder by side feeding and extruded together at high temperature, cooled, drawn, and pelletized, with the extrusion temperature being 260°C to 315°C, to obtain the laser-weldable halogen-free VO flame-retardant polyamide composite.

15. A laser-weldable halogen-free VO flame-retardant polyamide composite prepared by the method according to claim 13 or 14.

16. The use of the laser-weldable halogen-free VO flame-retardant polyamide composite according to any one of claims 1 to 12 in the vehicle thermal management system of new energy vehicles.

17. The use of the laser-weldable halogen-free VO flame-retardant polyamide composite according to any one of claims 1 to 12 in the electric drive, battery, and electronic control system of new energy vehicles.

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