Flame-retardant PA66 composite material, preparation method and application thereof

Abstract

The application provides a flame-retardant PA66 composite material and a preparation method and application thereof. The flame-retardant PA66 composite material comprises PA66 resin, red phosphorus, a toughening agent, a reinforcing material and a quaternary ammonium salt compound. Through reasonable collocation of the components, the obtained PA66 composite material has excellent flame-retardant performance, low phosphine release amount, very low corrosiveness to metal copper, and excellent mechanical properties, in particular, high toughness, and is suitable for application in products with high requirements for flame-retardant performance, metal corrosiveness and toughness.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a flame-retardant PA66 composite material, its preparation method, and its application. Background Technology

[0002] PA66 (polyhexamethylene adipate) resin has excellent mechanical properties, wear resistance, heat resistance and solvent resistance, so it is widely used in machinery manufacturing, power tools, electronics and electrical appliances and transportation. However, the poor flame retardancy of PA66 resin itself limits its wide application in the electronics and electrical appliance field, so flame retardant modification is required.

[0003] Red phosphorus, as a commonly used halogen-free flame retardant, has advantages such as minimal impact on the mechanical properties of the matrix, superior electrical properties and smoke density compared to halogenated flame retardant systems, low density, and high cost-effectiveness. Therefore, it is often used in the flame retardant modification of PA66. However, red phosphorus is prone to producing phosphine under the influence of heat, oxygen, and water. Phosphine can further transform into oxyacids, which can corrode metals in close contact with the product. This can severely affect the conductivity of electronic and electrical products, causing abnormal product quality and shortening the product's lifespan.

[0004] To address the issue of red phosphorus flame retardant PA66 easily corroding metals, three common approaches are used: First, modifying the red phosphorus to reduce the generation of phosphine and oxyacids. For example, CN101503568A and CN1775664A both use microencapsulated red phosphorus for modification, reducing its contact with water and oxygen, thus reducing phosphine generation. However, this method requires subjecting the red phosphorus to twin-screw shearing, heating, and single-screw injection molding processes during actual production, making it difficult to fundamentally eliminate phosphine and oxyacid generation. Second, reducing phosphine generation by weakening screw shearing or introducing nitrogen gas during production. For example, CN103304997A uses nitrogen gas to prevent red phosphorus from contacting oxygen, reducing phosphine and oxyacid generation and thus reducing metal corrosion. However, this method is overly complex and costly. Thirdly, adsorbents, fillers, or metal oxides are used to absorb and suppress the generated phosphine. For example, EP2072566A uses activated carbon and zeolite to adsorb phosphine, reducing the formation of oxyacids and thus reducing corrosion of metals. Other examples include CN107793749A which uses diatomaceous earth to adsorb phosphine, CN103992634A which uses iron oxides to reduce phosphine production, and CN105038211A which uses hydroxides, talc, magnesium oxide, and calcium oxide to reduce phosphine production. However, these fillers, adsorbents, metal oxides, and hydroxides can have a significant negative impact on the mechanical properties of the material, especially its toughness, affecting the application of the resulting PA66 composite material in high-toughness products.

[0005] Therefore, in order to address the above problems, there is an urgent need to develop a flame-retardant PA66 composite material with excellent flame retardant properties, low metal corrosion, and high toughness. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a flame-retardant PA66 composite material, its preparation method and application. The flame-retardant PA66 composite material has the characteristics of low phosphine release, low metal corrosion, high toughness and excellent flame retardant properties, and can be widely used in products with high requirements for flame retardant performance, metal corrosion resistance and toughness.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a flame-retardant polyamide 66 composite material, wherein the flame-retardant PA66 composite material comprises the following components in parts by weight:

[0009] 20-60 parts by weight of PA66 resin;

[0010]

[0011] The flame-retardant PA66 composite material provided by this invention comprises PA66 resin, red phosphorus, reinforcing materials, toughening agents, and quaternary ammonium salt compounds. The addition of red phosphorus effectively improves the flame-retardant properties of the resulting PA66 composite material. Furthermore, the addition of the toughening agent and reinforcing materials effectively improves the toughness of the resulting PA66 composite material. Finally, the addition of the quaternary ammonium salt compounds significantly reduces the problem of phosphine generation from the added red phosphorus, thereby effectively reducing the corrosiveness of the resulting PA66 composite material to metals. Therefore, through the rational combination of the above components, the resulting PA66 composite material possesses excellent flame-retardant properties while also exhibiting low phosphine release, resulting in very low corrosion of copper. Simultaneously, it possesses excellent mechanical properties, particularly high toughness, making it suitable for application in electronic and electrical products requiring high resistance to metal corrosion and high toughness.

[0012] The content of PA66 resin may be 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight, or 60 parts by weight, and the mass percentage of PA66 resin in the flame-retardant PA66 composite material shall not be less than 25%.

[0013] The content of red phosphorus can be 2.4 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 7 parts by weight, 9 parts by weight, 10 parts by weight, or 12 parts by weight, etc.

[0014] The content of the reinforcing material can be 15 parts by weight, 17 parts by weight, 19 parts by weight, 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 31 parts by weight, 33 parts by weight, 35 parts by weight, 40 parts by weight, or 45 parts by weight, etc.

[0015] The toughening agent content can be 0 parts by weight, 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, 10 parts by weight, 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, or 20 parts by weight, etc.

[0016] The content of the quaternary ammonium salt compound can be 0.02 parts by weight, 0.05 parts by weight, 0.07 parts by weight, 0.09 parts by weight, 0.1 parts by weight, 0.2 parts by weight, 0.4 parts by weight, or 0.6 parts by weight, etc.

[0017] Preferably, the number average molecular weight of the PA66 resin is 5,000 to 40,000, such as 5,000, 7,000, 9,000, 11,000, 13,000, 15,000, 20,000, 25,000, 30,000, 35,000, or 40,000.

[0018] In this invention, the number-average molecular weight of the PA66 resin can be tested according to the ISO 16014-4:2012 standard, and the test solvent is hexafluoroisopropanol, and the test column temperature is 50°C.

[0019] Preferably, the relative viscosity of the PA66 resin is 1.8 to 3.5, such as 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4 or 3.5, and more preferably 2.2 to 2.9.

[0020] In this invention, the relative viscosity of the PA66 resin can be tested with reference to the standard GB / T12006.1-2009. The specific test steps are as follows: First, prepare a 0.005 g / mL PA66 resin sulfuric acid test solution; then, inject the test solution and pure solvent into an Ubbelohde viscometer, and measure the flow time of the test solution and pure solvent in a constant temperature water bath at 25°C; finally, calculate the relative viscosity (ηr) according to the formula: ηr=t / t o Where t is the flow time of the solution to be tested, t o This represents the flow time of the pure solvent.

[0021] Preferably, the concentration of the terminal amino group of the PA66 resin is ≤200 mmol / kg, such as 200 mmol / kg, 180 mmol / kg, 160 mmol / kg, 140 mmol / kg, 120 mmol / kg, 100 mmol / kg, 80 mmol / kg, 60 mmol / kg or 40 mmol / kg.

[0022] In this invention, the concentration of the terminal amino groups of the PA66 resin can be tested with reference to the standard HG / T4182-2012.

[0023] In this invention, the flame retardant red phosphorus is preferably added in the form of red phosphorus masterbatch, which can be obtained through microencapsulation. This invention does not impose special restrictions on the source of the red phosphorus masterbatch; commercially available red phosphorus masterbatch can be directly selected, or it can be prepared in-house using existing microencapsulation methods. Specifically, the microencapsulation preparation method of the red phosphorus masterbatch is as follows: first, red phosphorus is coated with an inorganic compound, then treated with an organic compound to increase its compatibility with the polymer carrier, and finally extruded and granulated with a carrier resin to obtain the red phosphorus masterbatch. Commonly used inorganic compounds include zinc phosphate, calcium phosphate, calcium silicate, zinc silicate, and magnesium oxide; commonly used organic compounds include phenolic resin, melamine-formaldehyde resin, epoxy resin, and polyacrylic acid resin; commonly used carrier resins include PA resin, POE resin, EVA resin, EBA resin, and EMA resin.

[0024] Preferably, the red phosphorus masterbatch contains 40% to 60% red phosphorus by mass, such as 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, or 60%.

[0025] The specific content of red phosphorus in the flame-retardant PA66 composite material can be obtained by multiplying the amount of red phosphorus masterbatch added by the mass percentage of red phosphorus in the red phosphorus masterbatch.

[0026] Preferably, the reinforcing material includes at least one of glass fiber, carbon fiber, aramid fiber, or ceramic fiber.

[0027] Preferably, the toughening agent content in the flame-retardant PA66 composite material is 6 to 20 parts by weight.

[0028] Preferably, the toughening agent comprises at least one of maleic anhydride-grafted polyethylene, maleic anhydride-grafted thermoplastic elastomer, maleic anhydride-grafted EPDM rubber, acrylic acid-grafted polyethylene, acrylic acid-grafted thermoplastic elastomer, glycidyl acrylate-grafted polyethylene, glycidyl acrylate-grafted thermoplastic elastomer, glycidyl acrylate-grafted EPDM rubber, or ethylene-methyl acrylate copolymer, and more preferably maleic anhydride-grafted thermoplastic elastomer.

[0029] Preferably, the quaternary ammonium salt compound has the general chemical formula [R1R2R3R4N]. + X -R1 to R3 are each independently selected from at least one of C1 to C6 (e.g., C1, C2, C3, C4, C5 or C6) alkyl and C6 to C20 (e.g., C6, C8, C10, C12, C14, C16, C18 or C20, etc.) aryl, R4 is selected from C10 to C30 (e.g., C10, C14, C18, C22, C24, C26, C28 or C30, etc.) alkyl, and X is a halogen (e.g., F, Cl, Br, I, At, etc.).

[0030] Preferably, the quaternary ammonium salt compound comprises any one or a combination of at least two of the following: dimethyloctadecylbenzylammonium chloride, trimethylhexadecylammonium bromide, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride, eicosyltrimethylammonium chloride, dodecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, triacontyltrimethylammonium chloride, dodecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium bromide, eicosyltrimethylammonium bromide, dodecyltrimethylammonium bromide, tridecyltrimethylammonium bromide, dodecyltrimethylammonium bromide, tridecyltrimethylammonium bromide, dodecyltrimethylammonium bromide, tridecyltrimethylammonium bromide, triacontyltrimethylammonium bromide, triacontyltrimethylammonium bromide, triacontyltrimethylammonium bromide, or triacontyltrimethylammonium bromide, and more preferably dimethyloctadecylbenzylammonium chloride.

[0031] Preferably, at least one of R1 to R3 is selected from C6 to C20 aryl groups, X is selected from Cl or Br, and the quaternary ammonium salt compound is further preferably dimethyl octadecyl benzyl ammonium chloride.

[0032] Preferably, the mass percentage of the quaternary ammonium salt compound in the flame-retardant PA66 composite material is 0.05-0.8%, such as 0.05%, 0.07%, 0.09%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, or 0.8%, and more preferably 0.1-0.3%. Further preferably, limiting the mass percentage of the quaternary ammonium salt compound within the above-mentioned preferred range ensures that the resulting flame-retardant PA66 composite material exhibits lower metal corrosion resistance and higher toughness. To achieve better flame retardancy and performance, on the one hand, if the mass percentage of the quaternary ammonium salt compound is less than 0.1%, the resulting PA66 composite material will have an increased phosphine release, a higher metal corrosion rating, and a high phosphorus content in the solution after soaking. On the other hand, if the mass percentage of the quaternary ammonium salt compound exceeds 0.3%, although it can ensure that the resulting PA66 composite material has a very low phosphine release and a very low metal corrosion rating, it will lead to a decrease in the notched impact strength of the PA66 composite material and a deterioration in toughness.

[0033] Preferably, the flame-retardant PA66 composite material further includes antioxidants and / or lubricants.

[0034] Preferably, the antioxidant content in the flame-retardant PA66 composite material is 0.1 to 1 part by weight, for example, 0.1 part by weight, 0.2 part by weight, 0.3 part by weight, 0.4 part by weight, 0.5 part by weight, 0.6 part by weight, 0.7 part by weight, 0.8 part by weight, 0.9 part by weight, or 1 part by weight.

[0035] Preferably, the antioxidant comprises at least one of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine (antioxidant 1098), triethylene glycol ether-di(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate (antioxidant 245), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), tris[2,4-di-tert-butylphenyl] phosphite (antioxidant 168), tetrakis(2,4-di-tert-butylphenol)4,4'-biphenyl diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate, or a copper salt antioxidant.

[0036] Preferably, the copper salt antioxidant comprises a mixture containing a +1 copper salt, such as a mixture of potassium iodide, cuprous iodide and zinc stearate.

[0037] Preferably, the content of lubricant in the flame-retardant PA66 composite material is 0.1 to 1 part by weight, such as 0.1 part by weight, 0.2 part by weight, 0.3 part by weight, 0.4 part by weight, 0.5 part by weight, 0.6 part by weight, 0.7 part by weight, 0.8 part by weight, 0.9 part by weight, or 1 part by weight.

[0038] Preferably, the lubricant comprises at least one of oxidized polyethylene wax, calcium stearate, modified ethylene bis-fatty acid amide, aliphatic fatty acid ester, or ethylene-acrylic acid copolymer.

[0039] Furthermore, for the flame-retardant PA66 composite material provided by this invention, colorants, fillers other than reinforcing materials, weathering agents, antistatic agents, etc., can be added according to actual needs without affecting the technical effect.

[0040] For example, the colorant can be selected from quinacridone red, azo compounds, azo orange, phthalocyanine blue, phthalocyanine green, naphthyl ketone red, anthrone red, anthrone blue, anthraquinone violet, azo orange, methylene orange, zinc sulfide, cerium sulfide, carbon black, ultramarine blue, ultramarine violet, etc.

[0041] For example, the fillers other than the reinforcing material can be glass microspheres, talc, wollastonite, or magnesium hydroxide, etc.

[0042] For example, the weathering agent may be selected from salicylate, benzotriazole, benzophenone, etc.

[0043] For example, the antistatic agent can be selected from ionic antistatic agents (e.g., sulfonates, carboxylates), nonionic antistatic agents (e.g., glycerol esters, polyoxyethylene ethers, etc.), conductive-filled antistatic agents (e.g., carbon black, carbon nanotubes, graphene, metals and their oxides), etc.

[0044] In a second aspect, the present invention provides a method for preparing a flame-retardant PA66 composite material as described in the first aspect, the method comprising: mixing the various components, extruding and granulating them using an extruder to obtain the flame-retardant PA66 composite material.

[0045] Preferably, the mixing time is 3 to 5 minutes, such as 3.2 minutes, 3.4 minutes, 3.6 minutes, 3.8 minutes, 4 minutes, 4.2 minutes, 4.4 minutes, 4.6 minutes, 4.8 minutes, or 5 minutes.

[0046] Preferably, the extruder is a twin-screw extruder.

[0047] Preferably, the extrusion granulation temperature is 250–290°C, for example, 250°C, 260°C, 270°C, 280°C, or 290°C.

[0048] Thirdly, the present invention provides a component, characterized in that the component comprises the flame-retardant PA66 composite material as described in the first aspect.

[0049] Preferably, the component includes at least one of the following: household goods parts, electronic components, household equipment parts, gardening equipment parts, medical technology equipment parts, or motor vehicle parts.

[0050] In particular, the aforementioned flame-retardant PA66 composite material can be used to prepare parts with good toughness, flame retardancy and metal corrosion resistance, and more specifically, it can be used to prepare photovoltaic connector bodies.

[0051] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] The flame-retardant PA66 composite material provided by this invention includes PA66 resin, red phosphorus masterbatch, toughening agent, reinforcing material, and quaternary ammonium salt compound. Through the reasonable combination of the above components, the obtained PA composite material has excellent flame-retardant properties and low phosphine release, resulting in very low corrosion of copper. It also has excellent mechanical properties, especially high toughness, making it suitable for use in electronic components with high requirements for flame retardancy, metal corrosion resistance, and toughness. Detailed Implementation

[0054] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0055] Detailed information on some of the raw materials involved in the following embodiments and comparative examples is shown below:

[0056] (1) PA66 resin

[0057] PA66-1: Relative viscosity 2.6, purchased from Huafeng Chemical Co., Ltd., grade EP-158;

[0058] PA66-2: Relative viscosity is 2.4, purchased from Shenma Industrial Co., Ltd., grade EPR24;

[0059] PA66-3: Relative viscosity 2.8, purchased from Shenma Industrial Co., Ltd., grade EPR27;

[0060] PA66-4: Relative viscosity 2.1, purchased from Ascend Performance Materials, grade PA6621SPC;

[0061] PA66-5: Relative viscosity 3.2, purchased from Shenma Industrial Co., Ltd., grade EPR32.

[0062] (2) Red phosphorus masterbatch

[0063] Red phosphorus masterbatch: The effective content of red phosphorus is 45wt%, purchased from Tongcheng Xinde New Materials Co., Ltd., with the grade FR9950T.

[0064] (3) Reinforcing materials

[0065] Fiberglass: Purchased from Jushi Group, brand name ECS10-03-568H.

[0066] (4) Toughening agent

[0067] POE-g-MAH: Maleic anhydride-grafted thermoplastic elastomer, purchased from DowDuPont, grade FUSABONDN493;

[0068] Ethylene-methyl acrylate copolymer: purchased from Arkema SA, brand name: 35BA40.

[0069] (5) Quaternary ammonium salt compounds

[0070] Trimethylhexadecylammonium bromide: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., brand name CTAB;

[0071] Dimethyloctadecylbenzylammonium chloride: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., grade 1827;

[0072] Dodecyltrimethylammonium chloride: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., brand name DTAC;

[0073] Dodecyltrimethylammonium bromide: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., brand name DTAB.

[0074] (6) Antioxidants

[0075] Antioxidant 1098: N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, commercially available.

[0076] (7) Lubricant

[0077] Oxidized polyethylene wax: purchased from Honeywell, brand name A-C540A.

[0078] Examples 1-15 and Comparative Examples 1-3

[0079] Examples 1-15 and Comparative Examples 1-3 each provide a flame-retardant PA66 composite material, the components of which are shown in Table 1 and Table 2. In Table 1 and Table 2, the amount of each component is in "parts by weight".

[0080] Table 1

[0081]

[0082]

[0083] Table 2

[0084]

[0085] The preparation methods of the flame-retardant PA66 composite materials provided in Examples 1-15 and Comparative Examples 1-3 include: mixing each component for 4 min, placing it in a twin-screw extruder and extruding and granulating it at 280°C to obtain the flame-retardant PA66 composite material.

[0086] Performance testing:

[0087] (1) Impact strength of cantilever beam notch: Tested in accordance with ISO 180-2020 standard.

[0088] (2) Flame retardant performance: Tested in accordance with the UL 94-2023 standard, the sample size is 125×13×1.6mm.

[0089] (3) Phosphine release: ① Equipment: Desiccant dish (300mm diameter), Dräger phosphine tester and stopwatch; ② Test procedure: Continuous injection molding at 285℃, 280℃, 275℃ and 270℃, take 20 molds and 21 molds as samples, put them into the desiccant dish, seal it, start the stopwatch, and take the reading at 5 minutes; ③ Result: Phosphine release = Reading of the tester / Mass of the sample (kg).

[0090] (4) Metal corrosion and phosphorus content in the solution after immersion: ① Equipment: heat aging oven, wide-mouth bottle, test tube with diameter of 12mm × length of 100mm, analytical balance, inductively coupled atomic emission spectrometer (ICP) and tweezers; ② Test procedure: Take 50g of sample particles and place them in a 500mL wide-mouth bottle. Then take a copper sheet with specifications of 80mm × 10mm × 1.0mm and insert it into the sample particles, with the exposed part being 40mm in length. Put 8mL of deionized water into the test tube, place the test tube into the wide-mouth bottle, seal it, and then place the wide-mouth bottle at 85℃ for 3 days. Take out the copper sheet, visually inspect the corrosion effect, record the corrosion level, and then immerse the corroded copper sheet in 30mL of 5wt% HCl solution for 1h. Use ICP to test the phosphorus content in the solution.

[0091] Copper sheet corrosion grade 1: There is basically no corrosion or rust on the copper sheet;

[0092] Copper sheet corrosion grade 2: One-third of the copper sheet shows signs of corrosion and rust.

[0093] Copper sheet corrosion grade 3: 2 / 3 of the copper sheet shows signs of corrosion and rust.

[0094] Copper sheet corrosion level 4: More than 2 / 3 of the copper sheet shows signs of corrosion and rust.

[0095] The flame-retardant PA66 composite materials provided in Examples 1-15 and Comparative Examples 1-3 were tested according to the above test methods. The test results are shown in Table 3.

[0096] Table 3

[0097]

[0098]

[0099] According to the data in Table 3:

[0100] The notched impact strength of the flame-retardant PA66 composite materials provided in Examples 1-15 all reached 15 kJ / m. 2 All of the above exhibit flame retardant properties reaching V-1 to V-0 levels, phosphine release levels below 30 ppm / kg, metal corrosion ratings of 1 to 2, and phosphorus content in the solution after immersion below 60 ppm. They combine high toughness, low metal corrosion, and excellent flame retardant properties.

[0101] Comparing the data of Example 1 and Comparative Example 1, it can be seen that the absence of quaternary ammonium salt compound results in a high phosphine release rate, a high metal corrosion level, and a high phosphorus content in the solution after soaking.

[0102] Further comparison of the data from Example 1 and Comparative Examples 3-4 shows that the absence of red phosphorus masterbatch (Comparative Example 3) or the absence of reinforcing material (Comparative Example 4) directly results in the PA66 composite material having no flame retardant rating, i.e., no flame retardant properties. Furthermore, the absence of reinforcing material (Comparative Example 4) also leads to a decrease in the cantilever beam notched impact strength and a deterioration in the toughness of the PA66 composite material.

[0103] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A flame-retardant PA66 composite material, characterized in that, The flame-retardant PA66 composite material comprises the following components by weight: 20-60 parts by weight of PA66 resin; 2.4-12 parts by weight of red phosphorus; 15-45 parts by weight of reinforcing material; Toughening agent 0-20 parts by weight; 0.01~0.7 parts by weight of quaternary ammonium salt compounds; The reinforcing material includes at least one of glass fiber, carbon fiber, aramid fiber, or ceramic fiber; The general chemical formula of the quaternary ammonium salt compound is [R1R2R3R4N]. + X - R1 to R3 are each independently selected from at least one of C1 to C6 alkyl and C6 to C20 aryl, R4 is selected from C10 to C30 alkyl, and X is a halogen.

2. The flame-retardant PA66 composite material according to claim 1, characterized in that, The relative viscosity of the PA66 resin is 1.8~3.

5.

3. The flame-retardant PA66 composite material according to claim 2, characterized in that, The relative viscosity of the PA66 resin is 2.2~2.

9.

4. The flame-retardant PA66 composite material according to claim 1, characterized in that, The toughening agent content in the flame-retardant PA66 composite material is 6 to 20 parts by weight.

5. The flame-retardant PA66 composite material according to claim 4, characterized in that, The toughening agent includes at least one of maleic anhydride-grafted polyethylene, maleic anhydride-grafted thermoplastic elastomer, maleic anhydride-grafted EPDM rubber, acrylic acid-grafted polyethylene, acrylic acid-grafted thermoplastic elastomer, glycidyl acrylate-grafted polyethylene, glycidyl acrylate-grafted thermoplastic elastomer, glycidyl acrylate-grafted EPDM rubber, or ethylene-methyl acrylate copolymer.

6. The flame-retardant PA66 composite material according to claim 5, characterized in that, The toughening agent is a maleic anhydride-grafted thermoplastic elastomer.

7. The flame-retardant PA66 composite material according to claim 1, characterized in that, The quaternary ammonium salt compound includes at least one of dimethyloctadecylbenzylammonium chloride, trimethylhexadecylammonium bromide, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride, eicosyltrimethylammonium chloride, dodecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, triacontyltrimethylammonium chloride, dodecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium bromide, eicosyltrimethylammonium bromide, dodecyltrimethylammonium bromide, triacontyltrimethylammonium bromide, dodecyltrimethylammonium bromide, tridecyltrimethylammonium bromide, triacontyltrimethylammonium bromide, or triacontyltrimethylammonium bromide.

8. The flame-retardant PA66 composite material according to claim 7, characterized in that, The quaternary ammonium salt compound is dimethyloctadecylbenzylammonium chloride.

9. The flame-retardant PA66 composite material according to claim 1, characterized in that, At least one of R1 to R3 is selected from C6 to C20 aryl groups, and X is selected from Cl or Br.

10. The flame-retardant PA66 composite material according to claim 1, characterized in that, The flame-retardant PA66 composite material also includes antioxidants and / or lubricants.

11. The flame-retardant PA66 composite material according to claim 10, characterized in that, The antioxidant content in the flame-retardant PA66 composite material is 0.1 to 1 part by weight.

12. The flame-retardant PA66 composite material according to claim 10, characterized in that, The antioxidant includes at least one of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, triethylene glycol ether-di(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris[2,4-di-tert-butylphenyl]phosphite, tetrakis(2,4-di-tert-butylphenol)4,4'-biphenyl diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphate, or a copper salt antioxidant.

13. The flame-retardant PA66 composite material according to claim 10, characterized in that, The content of lubricant in the flame-retardant PA66 composite material is 0.1 to 1 part by weight.

14. The flame-retardant PA66 composite material according to claim 10, characterized in that, The lubricant includes at least one of oxidized polyethylene wax, calcium stearate, modified ethylene bis-fatty acid amide, aliphatic fatty acid ester, or ethylene-acrylic acid copolymer.

15. A method for preparing a flame-retardant PA66 composite material as described in any one of claims 1 to 14, characterized in that, The preparation method includes: mixing the various components, extruding and granulating them using an extruder to obtain the flame-retardant PA66 composite material.

16. The preparation method according to claim 15, characterized in that, The mixing time is 3 to 5 minutes.

17. The preparation method according to claim 15, characterized in that, The extruder is a twin-screw extruder.

18. The preparation method according to claim 15, characterized in that, The extrusion granulation temperature is 250~290℃.

19. A component, characterized in that, The component comprises the flame-retardant PA66 composite material as described in any one of claims 1 to 14.

20. The part according to claim 19, characterized in that, The components include at least one of the following: household goods, electronic components, household equipment parts, gardening equipment parts, medical technology equipment parts, or motor vehicle parts.

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