CN117659690A - A kind of nylon 66 composite material and its preparation method and application - Google Patents

Abstract

The invention provides a nylon 66 composite material and its preparation method and application. In parts by weight, the nylon 66 composite material includes 25 to 62 parts of nylon 66 resin, 13 to 54 parts of flat glass fiber, and halogen-free flame retardant. 10 to 20 parts and 5.5 to 10 parts of synergistic flame retardant; the halogen-free flame retardant is inorganic hypophosphite; the synergistic flame retardant includes non-cage polysiloxane and cage polysilsesquioxane A combination of oxyalkanes; the viscosity of the nylon 66 resin is less than or equal to 3.0. In the present invention, through the compounding of each component, the nylon 66 composite material has the advantages of high laser transmittance, good flame retardant performance and less precipitation under high temperature and high humidity conditions, and is especially suitable for electronic products prepared by laser welding technology. element.

Description

A kind of nylon 66 composite material and its preparation method and application

Technical field

The invention belongs to the technical field of modified nylon composite materials, and specifically relates to a nylon 66 composite material and its preparation method and application.

Background technique

The concept of laser welding began in the 1970s. It usually uses diode lasers or neodymium-doped yttrium aluminum garnet synthetic crystal (Nd:YAG) lasers with wavelengths between 700-1200nm to generate a large amount of heat at the welding site, thereby causing The component contact area melts to form a solder joint.

Compared with traditional plastic welding processes, laser welding can be applied to various flexible structures. Its welding strength is high, and its rapid heating and cooling rate can reduce the thermal impact on the material, and does not produce external force on the weldment. As a result, the stress and deformation of the weldment are very small; in addition, the welding process of laser welding is stable, the surface and internal quality of the weld are very good, and it can be welded in vacuum, air or other gas environments, and is suitable for the welding medium. It is not demanding and can weld through glass or other materials that are transparent to the beam. Because laser welding has the above unique advantages, it has been successfully used in precision welding of micro and small parts.

The repeating units on the molecular chain of nylon 66 (PA66) contain polar amide groups, which can form hydrogen bonds between molecules. The structure is regular, crystalline, and has strong intermolecular interactions. Therefore, the main feature of polyamide is its mechanical properties. Excellent, high strength, high rigidity, good toughness; self-lubricating, good friction resistance; wide operating temperature range, good electrical insulation properties, high volume resistivity and breakdown voltage resistance, good oil resistance and chemical stability. With the development of new energy vehicles, halogen-free flame-retardant nylon is widely used in high-voltage connectors, charging gun plugs and sockets, and actuator housings due to its good electrical insulation properties, flame retardant properties, excellent toughness and high CTI value. and other electronic and electrical components. However, because the amide group in the PA66 molecular chain can easily form hydrogen bonds with water molecules, it has the disadvantage of high water absorption. In addition, in the existing technology, for halogen-free flame-retardant nylon, flame retardants generally use melamine polyphosphate (MPP), melamine cyanuric acid (MCA) or orthophosphate and organic hypophosphite to improve the flame retardant properties of the material. ; However, this type of material is not suitable for laser welding processes. During the laser welding process, there is insufficient laser transmittance, and it is easy to decompose, resulting in a large amount of smoke and blistering, and there are problems such as easy precipitation after high temperature and high humidity; and The laser transmittance of black nylon materials in the existing technology is low, thus limiting the application of halogen-free flame-retardant nylon materials.

Therefore, developing a nylon 66 material that has both high laser transmittance and excellent flame retardant properties, no precipitation under high temperature and high humidity conditions, and is suitable for laser welding processes is an urgent problem to be solved in this field.

Contents of the invention

In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a nylon 66 composite material and its preparation method and application. The nylon 66 composite material, through compounding of various components, has the advantages of high laser transmittance, good flame retardant performance and less precipitation under high temperature and high humidity conditions, and is especially suitable for electronic components prepared by laser welding processes.

To achieve this goal, the present invention adopts the following technical solutions:

In the first aspect, the present invention provides a nylon 66 composite material. In parts by weight, the nylon 66 composite material includes 25 to 62 parts of nylon 66 resin, 13 to 54 parts of flat glass fiber, and 10 to 20 parts of halogen-free flame retardant. and 5.5 to 10 parts of synergistic flame retardant; the halogen-free flame retardant is inorganic hypophosphite; the synergistic flame retardant includes non-cage polysiloxane and cage polysilsesquioxane. Combination; the viscosity of the nylon 66 resin is less than or equal to 3.0.

In the present invention, a synergistic flame retardant of a specific composition is compounded with a specific type of halogen-free flame retardant, flat glass fiber and nylon 66 with a specific viscosity, so that the nylon 66 composite material can have both high laser transmittance and excellent performance. It has excellent flame retardant properties and is resistant to high temperatures and high humidity. It has no precipitation and good stability when treated under high temperature and humidity for a long time; it avoids the shortcomings of reduced laser transmittance and easy precipitation caused by the use of other compound flame retardants. It is especially suitable for For products prepared using laser welding technology.

In the present invention, 25 to 62 parts of nylon 66 resin can be, for example, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 33.5 parts, 34 parts, 35 parts , 36 copies, 37 copies, 38 copies, 39 copies, 40 copies, 41 copies, 42 copies, 43 copies, 44 copies, 45 copies, 46 copies, 47 copies, 48 copies, 49 copies, 50 copies, 50.5 copies, 51 copies parts, 51.5 parts, 52 parts, 52.5 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts, 61 parts, 62 parts, etc.

Flat glass fiber 13 to 54 parts, for example, it can be 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 copies, 27 copies, 28 copies, 29 copies, 30 copies, 31 copies, 32 copies, 33 copies, 34 copies, 35 copies, 36 copies, 37 copies, 38 copies, 39 copies, 40 copies, 41 copies, 42 copies , 43 copies, 44 copies, 45 copies, 46 copies, 47 copies, 48 copies, 49 copies, 50 copies, 51 copies, 52 copies, 53 copies, 54 copies, etc.

10 to 20 parts of halogen-free flame retardant, for example, it can be 10 parts, 10.2 parts, 10.5 parts, 10.8 parts, 11 parts, 11.2 parts, 11.5 parts, 11.8 parts, 12 parts, 12.2 parts, 12.5 parts, 12.8 parts, 13 parts parts, 13.2 parts, 13.5 parts, 13.8 parts, 14 parts, 14.2 parts, 14.5 parts, 14.8 parts, 15 parts, 15.2 parts, 15.5 parts, 15.8 parts, 16 parts, 16.2 parts, 16.5 parts, 16.8 parts, 17 parts, 17.2 parts, 17.5 parts, 17.8 parts, 18 parts, 18.2 parts, 18.5 parts, 18.8 parts, 19 parts, 19.2 parts, 19.5 parts, 19.8 parts, 20 parts, etc.

5.5 to 10 parts of synergistic flame retardant, for example, it can be 5.5 parts, 5.8 parts, 6 parts, 6.2 parts, 6.5 parts, 6.8 parts, 7 parts, 7.2 parts, 7.5 parts, 7.8 parts, 8 parts, 8.2 parts, 8.5 parts parts, 8.8 parts, 9 parts, 9.2 parts, 9.5 parts, 9.8 parts, 10 parts, etc.

Preferably, the viscosity of the nylon 66 resin is less than or equal to 3.0, for example, it can be 1, 1.2, 1.5, 1.8, 2, 2.2, 2.4, 2.42, 2.44, 2.46, 2.48, 2.5, 2.52, 2.54, 2.56, 2.58, 2.6 , 2.62, 2.64, 2.68, 2.7, 2.72, 2.74, 2.76, 2.78, 2.8, 3, etc.; preferably 2.4 to 2.8.

In the present invention, the viscosity of the nylon 66 resin is tested according to the FZ/T51004-2011 standard.

In the present invention, the resin viscosity of the nylon 66 is not within the above-mentioned limited range, the viscosity is high, and the processing performance is poor.

Preferably, the short-side diameter of the flat glass fiber is 6-15 μm, for example, it can be 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc.

Preferably, the average profile ratio of the flat glass fibers is 3 to 5, for example, it can be 3, 3.5, 4, 4.5, 5, etc.

Preferably, the inorganic hypophosphite includes at least one of inorganic aluminum hypophosphite, inorganic zinc hypophosphite, and inorganic calcium hypophosphite. Preferably, the inorganic hypophosphite is inorganic aluminum hypophosphite.

Preferably, the mass ratio of the non-cage polysiloxane to cage polysilsesquioxane is 1: (0.1-5.5), wherein the specific values in (0.1-5.5) can be, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, etc.; more preferably 1: (1-4).

In the present invention, the mass ratio of the non-cage polysiloxane and cage polysilsesquioxane is not within the above-mentioned limited range. When the amount of cage polysilsesquioxane is too small, the barrier properties of the composition will be affected. flammability; when too much cage polysilsesquioxane is used, the transmittance of the composition will be affected.

Preferably, the cage polysilsesquioxane includes dodecyl cage polysilsesquioxane and/or octaphenyl cage polysilsesquioxane.

Preferably, the non-cage polysiloxane includes any one of branched polysiloxane, linear polysiloxane or branched phenyl silicone oil.

Preferably, the nylon 66 composite material also includes 0.05 to 1.2 parts of colorant in parts by weight, such as 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, etc.

Preferably, the coloring agent includes linear quinacridone red, naphtacridone red, complex red, azo orange, azo complex yellow, perylene yellow, anthraquinone purple, anthraquinone blue, methine orange, At least one of phthalocyanine blue, azo orange, or phthalocyanine green.

In the present invention, the nylon 66 composite material can be of natural color, or different colorants can be added to obtain composite materials of different colors; different colorants can also be used to obtain black nylon composite materials; for black nylon composite materials, this The invention uses colorants of different colors to form black colorants that can replace carbon black and help improve the laser transmittance of the material.

In the present invention, colorants of different colors are compounded to obtain a black colorant; the black colorant formed by colorants of different colors can replace carbon black, and the mass ratio of the colorants of different colors can be achieved by compounding the two colorants. It is 1: (0.5～1.5); the combination of three colorants is 1: (0.5～1.5): (0.5～1.5), and so on; among them, the specific value in (0.5～1.5) can be, for example, 0.5 , 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc.

As a preferred technical solution of the present invention, the nylon 66 composite material includes 40 to 50 parts by weight of nylon 66 resin, 25 to 35 parts of flat glass fiber, 13 to 15 parts of halogen-free flame retardant, and synergistic flame retardant. 7.5 to 10 parts of agent and 0.1 to 1 part of colorant.

Preferably, in parts by weight, the nylon 66 composite material also includes 0 to 1.8 parts of other auxiliaries, such as 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part , 0.9 parts, 1 part, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, etc.

Preferably, the other auxiliaries include at least one of antioxidants, light stabilizers, lubricants, release agents or antistatic agents.

In the present invention, the types of auxiliaries are not too limited, and conventional auxiliaries can be used. For example, the antioxidants include but are not limited to antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant Any one of agent 1098 or antioxidant DLTP.

The light stabilizers include but are not limited to hindered amine light stabilizers (such as light stabilizer 770, light stabilizer 622, light stabilizer 944, etc.), benzophenone light stabilizers (such as UV531) or benzotriazole. At least one azole light stabilizer.

The lubricant includes, but is not limited to, at least one of esters (such as polyethylene glycol ester, polyol ester), montanate, ethylene bisstearamide or polyethylene wax.

The release agent includes inorganic release agents (such as talc powder, mica powder, clay, etc.), organic release agents (such as fatty acids, paraffin, glycerin, petroleum jelly, etc.) or polymer release agents (such as silicone oil, polyethylene glycol, etc.). alcohol, low molecular weight polyethylene, etc.).

The antistatic agents include cationic antistatic agents (such as quaternary ammonium salts), anionic antistatic agents (such as alkyl sulfonates, phosphates), amphoteric antistatic agents (such as amphoteric imidazoline compounds), nonionic At least one of antistatic agents (such as hydroxyethyl alkyl amines, fatty amides, polyoxyethylenes, polyol esters) or polymer antistatic agents (such as polyethers).

In a second aspect, the present invention provides a method for preparing the nylon 66 composite material according to the first aspect. The preparation method includes the following steps:

Nylon 66 resin, flat glass fiber, halogen-free flame retardant and synergistic flame retardant are mixed and extruded to obtain the nylon 66 composite material.

Preferably, the mixed materials also include colorants and/or other auxiliaries.

Preferably, the preparation method includes premixing nylon 66 resin with a synergistic flame retardant and optional colorants and other auxiliaries to obtain a premix; and mixing the premix with flat glass fiber, halogen-free The flame retardant is mixed and extruded to obtain the black nylon 66 composite material.

Preferably, the extrusion temperature is 180-270°C, for example, it can be 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, 245°C, 250°C, 255°C, 260°C, 265℃, 270℃, etc.

In the present invention, the temperature refers to the temperature range of different sections of the twin-screw extruder. For example, the twin-screw extruder is divided into a first section (temperature is 180-220°C) and a second section (temperature is 180-220°C). 260～270℃), the third interval (temperature is 250～260℃), the fourth interval (temperature is 240～250℃), the fifth interval (temperature is 230～240℃), the sixth interval (temperature is 230～240℃) 240℃), seventh interval (temperature is 230~240℃), eighth interval (temperature is 230~240℃), ninth interval (temperature is 250~260℃), tenth interval (temperature is 260~270℃ ).

In a third aspect, the present invention provides a laser weldable electronic and electrical component. The material of the electronic and electrical component includes the nylon 66 composite material as described in the first aspect.

In the present invention, the electronic and electrical components include high-voltage connectors, charging gun plugs and sockets, controller housings, etc.

The numerical range described in the present invention not only includes the point values listed above, but also includes any point value between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention will not exhaustively enumerate the ranges. Specific point values included.

Compared with the prior art, the beneficial effects of the present invention are:

The nylon 66 composite material provided by the present invention uses a synergistic flame retardant of a specific composition, a specific type of halogen-free flame retardant (i.e., inorganic hypophosphite), flat glass fiber and nylon 66 of a specific viscosity, so that nylon 66 The composite material can have both high laser transmittance and excellent flame retardant properties, and is resistant to high temperature and humidity. It has no precipitation when processed under high temperature and high humidity for a long time, and has good stability; it avoids laser damage caused by using other compound flame retardants. The problem of reduced transmittance and easy precipitation is especially suitable for electronic components prepared by laser welding process; the flame retardant grade of the nylon 66 composite material reaches V-1 or above, and the laser transmittance is ≥27% at 85°C. , after being placed in a high temperature and high humidity chamber of 85% RH for 1000 hours, there will be little precipitation.

Detailed ways

The technical solution of the present invention will be further described below through specific implementations. Those skilled in the art should understand that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

The materials used in this invention are as follows:

PA66 resin 1: PA66 EP-158, viscosity 2.8, Huafeng Group;

PA66 resin 2: PA66 EPR32, viscosity 3.2, Shenma Group;

Flat glass fiber: ECS301HP-3-M4, Chongqing Composite International, short side monofilament diameter 6-8μm, average profile ratio 4.0, length 3mm;

Round glass fiber: ECS10-3.0-568H, Jushi Group, monofilament diameter 10um;

Inorganic hypophosphite: Inorganic aluminum hypophosphite 4138, Qingyuan Yicheng;

Inorganic hypophosphite: Inorganic calcium hypophosphite 4132, Qingyuan Yicheng;

Aluminum diethyl hypophosphite: OP 1230, Clariant;

Non-cage polysiloxane flame retardant: Dow 43-821, Dow Corning Company;

Cage polysilsesquioxane POSS: octaphenyl POSS and dodecylphenyl POSS, Sigma-Aldrich (Shanghai) Trading Co., Ltd.;

MPP: melamine polyphosphate, 3141, Budenheim;

MCA: melamine cyanurate, Shouguang Weidong;

Colorant 1: Anthraquinone Blue L308, Shenzhen Dingtai;

Colorant 2: Solvent Orange H554, BASF;

Colorant 3, complex red R297, BASF;

Unless otherwise specified, the colorant used in all examples and comparative examples of the present invention is a mixture of colorant 1, colorant 2 and colorant 3 with a weight ratio of 1:1:1;

Lubricant: oxidized polyethylene wax. Unless otherwise specified, the lubricant used in all examples and comparative examples of the present invention is oxidized polyethylene wax.

Examples 1 to 10

Embodiments 1 to 10 respectively provide a nylon 66 composite material. The formula of the nylon 66 composite material is as shown in Table 1 (parts by weight); the preparation method of the nylon 66 composite material includes: combining PA66 resin, synergistic resistance Add fuel, colorant and other additives to the high-speed mixer, stir evenly to obtain a mixture; add the mixture to the twin-screw extruder through a precision feeder, flat glass fiber and halogen-free flame retardant Added through different side feeding ports, extruded, cooled, dried, and pelletized, the nylon 66 composite material was obtained; wherein, the temperature settings in different sections of the twin-screw extruder were 180°C, 270°C, and 260°C. ℃, 250℃, 240℃, 240℃, 240℃, 240℃, 260℃, 270℃.

Table 1

Comparative Examples 1 to 8

Comparative Examples 1 to 8 respectively provide a nylon 66 composite material. The formula of the nylon 66 composite material is as shown in Table 2 (parts by weight); the preparation method of the nylon 66 composite material is the same as that of Examples 1 to 10.

Table 2

Performance Testing

(1) Flame retardant performance: Injection mold the nylon 66 composite materials provided in Examples 1 to 10 and Comparative Examples 1 to 8 into dumbbell-shaped splines of 127 mm × 12.7 mm × 1.6 mm, and conduct a vertical burning test in accordance with UL 94;

(2) Laser transmittance: Injection mold the nylon 66 composite materials provided in Examples 1 to 10 and Comparative Examples 1 to 8 into a 200mm×100mm×2mm sample, and use a near-infrared spectrometer (wavelength: 900-1700nm, Ocean Optics Company NIRQuest spectrometer) for testing;

(3) Precipitation level: Injection mold the nylon 66 composite materials provided in Examples 1 to 10 and Comparative Examples 1 to 8 into a 200mm×100mm×2mm sample, and place it in a high temperature and high humidity chamber at 85°C and 85% RH for 1000h. Finally, observe whether there is white precipitate on the surface of the sample. The evaluation standards for precipitation are divided into 5 levels, which are expressed as follows: 1. No precipitation; 2. A small amount of foreign matter is precipitated, and the number is <5; 3. A certain amount of foreign matter is precipitated, and 5≤number <8; 4. There is a lot of foreign matter. Precipitation, and 8 ≤ quantity < 15; 5, there is serious precipitation, and the quantity of foreign matter is ≥ 15.

The specific test results are shown in Table 3:

table 3

As can be seen from Table 3, the nylon 66 composite material provided by the present invention uses a specific composition of synergistic flame retardant, inorganic hypophosphite, and flat glass fiber, so that the nylon 66 composite material can have both high laser transmittance and excellent It has excellent flame retardant properties and is resistant to high temperatures and high humidity. It has no precipitation when treated under high temperature and high humidity for a long time and has good stability; it avoids the shortcomings of reduced laser transmittance and easy precipitation caused by the use of other compound flame retardants, even if it is Black nylon material also has high laser transmittance, which is especially suitable for products prepared by laser welding process. It can be seen from Examples 1 to 10 that the flame retardant grade of the nylon 66 composite material reaches V-1 level, and the laser transmittance is ≥27%. Furthermore, the flame retardant grade of the nylon 66 composite material reaches V-0 level. , the laser transmittance is ≥30%, and there will be little precipitation after being placed in a high temperature and high humidity box at 85°C and 85% RH for 1000 hours.

It can be seen from Examples 4 to 7 that within the preferred mass ratio range of non-cage polysiloxane and cage polysilsesquioxane, the material can have both high laser transmittance and excellent flame retardant properties. .

It can be seen from the comparison between Example 3 and Comparative Example 1 that only inorganic hypophosphite is used. Although the transmittance is high and the precipitation is less, the flame retardant performance cannot meet the requirements of V-0 level. It can be seen from Comparative Example 2 that flat glass is used. fiber, the laser transmittance of the composite material is significantly improved; from Comparative Examples 3-4 and 6-7, it can be seen that the material does not use a specific composition of synergistic flame retardant, and the material cannot have both high laser transmittance and excellent flame retardancy. performance and less precipitation.

In summary, the present invention uses inorganic hypophosphite, non-cage polysiloxane and cage polysilsesquioxane to compound it, which has the characteristics of high flame retardant efficiency and low precipitation. It also uses flat glass fibers and colorants. The compounding makes the PA66 composite material also have good laser transmittance.

The above-mentioned specific embodiments further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. The nylon 66 composite material is characterized by comprising, by weight, 25-62 parts of nylon 66 resin, 13-54 parts of flat glass fibers, 10-20 parts of halogen-free flame retardant and 5.5-10 parts of synergistic flame retardant;

the halogen-free flame retardant is inorganic hypophosphite;

the synergistic flame retardant comprises a combination of non-cage polysiloxane and cage polysilsesquioxane;

the viscosity of the nylon 66 resin is less than or equal to 3.0.

2. The nylon 66 composite of claim 1 wherein the flat glass fiber short side filaments have a diameter of 6 to 15 μm; the average special-shaped ratio of the flat glass fiber is 3-5.

3. The nylon 66 composite of claim 1, wherein the inorganic hypophosphite comprises at least one of inorganic aluminum hypophosphite, inorganic zinc hypophosphite, inorganic calcium hypophosphite; preferably, the inorganic hypophosphite is inorganic aluminum hypophosphite.

4. The nylon 66 composite material according to claim 1, wherein the mass ratio of the non-cage polysiloxane to the cage polysilsesquioxane is 1 (0.1-5.5); preferably, the mass ratio of the non-cage polysiloxane to the cage polysilsesquioxane is 1 (1-4).

5. The nylon 66 composite of claim 1, wherein the cage polysilsesquioxane comprises a dodecaphenyl cage polysilsesquioxane and/or an octaphenyl cage polysilsesquioxane; the non-cage polysiloxane comprises any one of branched polysiloxane, linear polysiloxane or branched phenyl silicone oil.

6. The nylon 66 composite of claim 1 further comprising 0.05 to 1.2 parts by weight of a colorant; the colorant comprises at least one of linear quinacridone red, naphthalenone red, complex red, azo orange, azo complex yellow, perylene yellow, anthraquinone violet, anthraquinone blue, methine orange, phthalocyanine blue, azo orange, or phthalocyanine green.

7. The nylon 66 composite of claim 1, wherein the nylon 66 composite comprises, in parts by weight, 40-50 parts of nylon 66 resin, 25-35 parts of flat glass fibers, 13-15 parts of halogen-free flame retardant, 7.5-10 parts of synergistic flame retardant and 0.1-1 part of colorant.

8. The nylon 66 composite of claim 1, wherein the nylon 66 composite further comprises 0 to 1.8 parts by weight of other adjuvants; the other auxiliary agent comprises at least one of an antioxidant, a light stabilizer, a lubricant, a mold release agent or an antistatic agent.

9. A method of producing a nylon 66 composite according to any one of claims 1 to 8, comprising the steps of:

mixing nylon 66 resin, flat glass fiber, halogen-free flame retardant and synergistic flame retardant, and extruding to obtain the nylon 66 composite material; preferably, the mixed material further comprises a colorant and/or other auxiliary agents; the extrusion temperature is 180-270 ℃.

10. A laser weldable electronic and electrical component, characterized in that the material of the electronic and electrical component comprises a nylon 66 composite according to any one of claims 1 to 8.