Polyphenyl ether composite material as well as preparation method and application thereof

Abstract

The invention relates to a polyphenyl ether composite material as well as a preparation method and application thereof, and belongs to the technical field of compositions of high-molecular compounds. The flame-retardant polyphenyl ether composite material is prepared from the following components in parts by weight: 38 to 62 parts of polyphenyl ether resin, 18 to 37 parts of polystyrene resin, 8 to 22 parts of flame retardant and 1 to 8 parts of flexibilizer, the total mass concentration of 3, 3 ', 5, 5'-tetramethyl-4, 4 '-biphenyl quinone and 3, 3', 5, 5 '-tetramethyl biphenol in the polyphenyl ether resin is 8 ppm to 30 ppm, and the flexibilizer comprises an ethylene terpolymer and a hydrogenated styrene-butadiene-styrene block copolymer. The flame-retardant polyphenyl ether composite material has the advantages of high flame retardance, high melt flowability and good matte characteristic.

Description

Technical Field

[0001] This invention relates to the field of polymer composition technology, specifically to a polyphenylene ether composite material, its preparation method, and its application. Background Technology

[0002] Polyphenylene oxide (PPE) resin possesses advantages such as light weight, high rigidity, dimensional stability, low water absorption, chemical corrosion resistance, excellent high-temperature electrical properties, and self-flame retardancy, making it widely used in the manufacture of electronic and electrical components, automotive parts, and photovoltaic cell housings. However, due to the high processing temperature of modified PPE resin (typically around 300℃), it is prone to decomposition at high temperatures, resulting in appearance issues such as air marks in high-gloss products. Currently, commercially available black or gray modified PPE products primarily achieve high gloss by selecting the type of toughening agent added and the appearance of the internal toughening agent in polystyrene, but this is insufficient to meet the needs of masking surface defects and reducing fingerprint residue, which require a matte finish. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a polyphenylene ether composite material, its preparation method, and its application.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a polyphenylene ether composite material, comprising the following components by weight: The mixture comprises 38-62 parts of polyphenylene ether resin, 18-37 parts of polystyrene resin, 8-22 parts of flame retardant, and 1-8 parts of toughening agent; the total mass concentration of 3,3',5,5'-tetramethyl-4,4'-biphenylquinone (TMDQ) and 3,3',5,5'-tetramethylbiphenylhydrazine (TMBP) in the polyphenylene ether resin is 8 ppm to 30 ppm. The toughening agent includes ethylene terpolymer and hydrogenated styrene-butadiene-styrene block copolymer.

[0005] This invention combines polyphenylene ether resin with specific TMDQ and TMBP contents with a specific toughening agent to obtain a matte flame-retardant polyphenylene ether material. Because TMDQ and TMBP have a large conjugated benzene ring structure, and the π-electron cloud of the benzene ring can form a large delocalized system, this structure makes it easier for electrons within the molecule to be excited, thereby enhancing the molecule's ability to absorb ultraviolet light, resulting in a yellow or even brownish-yellow color in the material. This characteristic is utilized to improve the softness and appearance of the product. Secondly, the toughening agent, a combination of ethylene terpolymer and hydrogenated styrene-butadiene-styrene block copolymer, disrupts the coherence between the toughening agent and the continuous PPE / PS phase, thereby improving the matte finish of the material. Furthermore, the curling and shrinking effect of the toughening agent on the sample during combustion can be used to suppress dripping and improve the flame-retardant ability of the polyphenylene ether composite material.

[0006] In this invention, the polyphenylene ether composite material contains ≥40% polyphenylene ether resin by mass. The mass concentration of TMDQ or TMBP in the polyphenylene ether resin can be determined by high-performance liquid chromatography (HPLC). The test method is as follows: using acetone or methanol as the standard solution solvent, a standard curve is established in HPLC. The target impurities are separated from the polyphenylene ether resin by dissolution and precipitation. The TMDQ test conditions are: a C18 column, a column temperature of 30℃, a flow rate of 0.6 mL / min, and a mobile phase of a mixed solution of 70% methanol and 30% acetone. The standard curve for TMDQ is Y1 = 8.05 × 10⁻⁶. 4 X1 - 8.57×10 1 Where Y1 represents the peak area of ​​TMDQ, X1 represents the content of TMDQ, and the detection limit is 0.01 ppm. The test conditions for TMBP are: HPLC-DAD column: C18; column temperature: 30℃; flow rate: 0.6 mL / min; mobile phase: 100% methanol solution. The standard curve for TMBP is Y2 = 1.32 × 10⁻⁶. 5 X2 - 7.29×10 2 Where Y2 is the peak area of ​​TMBP, X2 is the content of TMBP, and the detection limit is 0.1 ppm. The total mass concentration of TMDQ and TMBP = X1 + X2.

[0007] The polyphenylene ether resin in the polyphenylene ether composite material of the present invention can be any one or any two of the following values: 38 parts, 40 parts, 45 parts, 50 parts, 55 parts, and 60 parts; the polystyrene resin can be any one or any two of the following values: 18 parts, 20 parts, 25 parts, 27 parts, 29 parts, 31 parts, 33 parts, 35 parts, and 37 parts; the flame retardant can be any one or any two of the following values: 8 parts, 10 parts, 11 parts, 13 parts, 15 parts, 20 parts, and 22 parts; the toughening agent can be any one or any two of the following values: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, and 8 parts; and the total mass concentration of TMDQ and TMBP in the polyphenylene ether resin can be any one or any two of the following values: 8 ppm, 9 ppm, 10 ppm, 15 ppm, 18 ppm, 20 ppm, 25 ppm, and 30 ppm.

[0008] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the polyphenylene ether composite material further includes 1 to 8 parts by weight of a gloss modifier, wherein the gloss modifier includes silica and LLDPE, and the mass ratio of silica to LLDPE is 1:(1 to 3).

[0009] For example, the mass ratio of the ethylene terpolymer and the hydrogenated styrene-butadiene-styrene block copolymer can be any one or any two of the following: 1:1, 1:1.2, 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5, 1:2.8, 1:3.

[0010] This study found that adding silica and LLDPE as gloss modifiers can further improve the matte effect of the material system by utilizing their inherent matting effect. At the same time, by compounding processing aids such as lubricants to improve the dispersion of the material in the system, the reduction of the material performance caused by the matting groups can be reduced.

[0011] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the polyphenylene ether composite material further includes 0.4 to 3.2 parts by weight of processing aids.

[0012] The gloss modifier in the polyphenylene ether composite material of the present invention can be any one or any two of the following values: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, and 8 parts; the processing aid can be any one or any two of the following values: 0.4 parts, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, and 3.2 parts.

[0013] As a preferred embodiment of the polyphenylene ether composite material of the present invention, it comprises the following components by weight: 40-60 parts of polyphenylene ether resin, 20-35 parts of polystyrene resin, 10-20 parts of halogen-free flame retardant, 2-6 parts of rubber toughening agent, 2-6 parts of gloss modifier, and 0.5-3 parts of processing aid.

[0014] In a preferred embodiment of the polyphenylene ether composite material of the present invention, the mass ratio of the ethylene terpolymer and the hydrogenated styrene-butadiene-styrene block copolymer is 1:(1-2).

[0015] For example, the mass ratio of the ethylene terpolymer and the hydrogenated styrene-butadiene-styrene block copolymer can be any one or any two of the following: 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2.

[0016] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the intrinsic viscosity of the polyphenylene ether resin is 30~55 mL / g, preferably 35~50 mL / g.

[0017] For example, the intrinsic viscosity of polyphenylene ether resin can be any or both of the following values: 30 mL / g, 33 mL / g, 35 mL / g, 38 mL / g, 40 mL / g, 43 mL / g, 45 mL / g, 47 mL / g, 50 mL / g, 53 mL / g, and 55 mL / g.

[0018] Studies have found that by adjusting the intrinsic viscosity of polyphenylene ether resin within the aforementioned range, a balance between flowability and flame retardant properties can be achieved, but its impact on the material's gloss is relatively small. The intrinsic viscosity of polyphenylene ether resin can be determined using the Ubbelohde viscometer method, and specific details can be found in standard GB / T41874-2022 "Plastics - Polyphenylene Ether (PPE) Resin".

[0019] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the polystyrene resin includes high-impact polystyrene (HIPS), wherein the rubber content in the high-impact polystyrene is 15wt%~25wt%, and the average particle size of the rubber is 0.5μm-1.5μm.

[0020] Specifically, the rubber in HIPS refers to the butadiene segments. The rubber content in HIPS can be tested by 1H NMR spectroscopy, and the average particle size of 100 rubber particles in HIPS can be observed by transmission electron microscopy.

[0021] Furthermore, the average particle size of the rubber in the high-impact polystyrene is 0.9 μm-1.4 μm.

[0022] Studies have found that by selecting high-impact polystyrene resins with the aforementioned particle size, not only can the melt flowability of flame-retardant polyphenylene ether composites be improved to enhance their processing performance, but the gloss of the material surface can also be controlled.

[0023] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the polystyrene resin, according to standard ISO 1133-1-2022, has a melt mass flow rate of 1~8 g / 10min at 200 °C and 5 kg.

[0024] In a preferred embodiment of the polyphenylene ether composite material of the present invention, the mass ratio of the polyphenylene ether resin to the polystyrene resin is (1~3):1.

[0025] In the polyphenylene ether composite material of the present invention, the mass percentage content of polyphenylene ether resin is not less than 40%.

[0026] In a preferred embodiment of the polyphenylene ether composite material of the present invention, the flame retardant includes at least one of phosphate ester compounds, metal hydroxides, silicon-based flame retardants, nitrogen-based flame retardants, and nitrogen-phosphorus-based flame retardants.

[0027] Optionally, the D50 of the metal hydroxide is ≤1.5 μm.

[0028] For example, phosphate ester compounds can be at least one of triphenyl phosphite (TPP), resorcinol bis(diphenyl phosphate) (RDP), bisphenol A bis(diphenyl phosphate) (BDP), polyphenyl phosphate (9,10-dihydro-9-oxa-10-phosphonophenanthrene) phenylene ester (PDPPP), and bicyclic cage phosphate (PEPA); metal hydroxides can be at least one of aluminum hydroxide and magnesium hydroxide hydrotalcite; silicon-based flame retardants can be at least one of silica and silicates (wollastonite, montmorillonite, talc, etc.); nitrogen-based flame retardants can be at least one of melamine and melamine cyanurate; and nitrogen-phosphorus flame retardants can be at least one of melamine phosphate, melamine polyphosphate, and melamine pyrophosphate.

[0029] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the halogen-free flame retardant includes a metal hydroxide and a phosphate ester compound, wherein the mass ratio of the metal hydroxide to the phosphate ester compound is 1:(3~18).

[0030] In some specific embodiments, the metal hydroxide is magnesium hydroxide or hydrotalcite, and the phosphate ester flame retardant is bisphenol A-bis(diphenyl phosphate) (BDP).

[0031] Research has found that combining metal hydroxides with phosphate esters as halogen-free flame retardants can better improve the flame retardant properties of polyphenylene ether composites, while the addition of metal hydroxides can further improve the matte finish of the material.

[0032] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the hydrogenated styrene-butadiene-styrene block copolymer, according to standard ASTM D1238-2023, has a melt flow rate of <5 g / 10 min at 230°C and 5 kg. Optionally, the hydrogenated styrene-butadiene-styrene block copolymer, according to standard ASTM D1238-2023, has a melt flow rate of <1 g / 10 min at 230°C and 5 kg.

[0033] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the ethylene terpolymer includes an ethylene-acrylate-glycidyl methacrylate terpolymer.

[0034] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the ethylene-butyl methacrylate-glycidyl methacrylate terpolymer has a melt flow rate of 10~14 g / 10 min at 190°C and 2.16 kg, according to standard ASTM D1238-2023.

[0035] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the LLDPE, according to standard ISO 1133-1-2022, has a melt mass flow rate of 1.6~2.4 g / 10min at 190°C and 2.16 kg.

[0036] In some specific embodiments, the LLDPE is at least one of linear low-density polyethylene containing 1-butene, 1-hexene or 1-octene as comonomers.

[0037] In a preferred embodiment of the polyphenylene ether composite material of the present invention, the D50 of the silica is in the range of 5.0-7.5 μm. The D50 particle size of the silica is tested by laser diffraction, and the testing standard is ISO 13320:2020.

[0038] Studies have found that silica particles within the aforementioned particle size range can effectively scatter light, resulting in a significant extinction effect.

[0039] In a preferred embodiment of the polyphenylene ether composite material of the present invention, the processing aid includes at least one of antioxidant, colorant, and lubricant.

[0040] For example, the antioxidant may be at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine, octadecyl β-(4-hydroxy-3,5-di-tert-butylphenyl)propionate, and 2,6-di-tert-butyl-4-methylphenol tris[2,4-di-tert-butylphenyl]phosphite; the colorant may be at least one of carbon black, titanium dioxide, zinc sulfide, and iron oxide red; and the lubricant may be at least one of silicone lubricants, amide lubricants, and ester lubricants.

[0041] Secondly, the present invention provides a method for preparing the above-mentioned flame-retardant polyphenylene ether composite material, comprising the following steps: mixing the components uniformly and melting and extruding to obtain the flame-retardant polyphenylene ether composite material.

[0042] Specifically, in the above preparation method, a twin-screw extruder can be used for melt extrusion. The melt extrusion temperature is 250~300 ℃, the screw speed of the twin-screw extruder is 200~600 rpm, and the length-to-diameter ratio of the twin-screw extruder is (20~80):1.

[0043] Thirdly, the present invention provides an application of the above-mentioned polyphenylene ether composite material in the fields of home appliances, industrial control, or photovoltaics.

[0044] Fourthly, the present invention provides a housing made of the aforementioned polyphenylene ether composite material.

[0045] Specifically, the housing includes, but is not limited to, industrial control housing, home appliance housing, or photovoltaic energy storage housing.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention combines polyphenylene ether resin with specific concentrations of TMDQ and TMBP with a specific toughening agent, utilizing the differences in compatibility between different components to improve the matte finish of the material. Firstly, the presence of chromophores in TMDQ and TMBP enhances the material's bulk softness. Secondly, high-temperature dehydration and cyclization reactions form polycyclic aromatic hydrocarbon structures, promoting the formation of a combustion char layer. Thirdly, different toughening agents are blended to improve the coherence between the toughening agent and the PPE / PS continuous phase, thereby enhancing the matte finish of the material. Furthermore, the curling and shrinkage effect of the toughening agent during combustion suppresses droplets, improving the flame retardancy of the polyphenylene ether composite material. Finally, the matte effect of the gloss modifier itself is further enhanced, thus improving the overall matte finish of the material system. This meets the need for a matte finish to conceal surface defects and reduce fingerprint residue. Detailed Implementation

[0047] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0048] Unless otherwise specified, all other materials, reagents, etc. used in the examples and comparative examples are commercially available.

[0049] Examples 1-14 The composition of the polyphenylene ether composite material described in the embodiments of the present invention is shown in Table 1.

[0050] The preparation method of the polyphenylene ether composite material includes the following steps: according to the formula, the components are mixed and then added to a twin-screw extruder for melt extrusion to obtain the polyphenylene ether composite material.

[0051] The twin-screw extruder has a temperature range of 250~300℃, a screw length-to-diameter ratio of 40:1, and a screw speed of 400 rpm.

[0052] Comparative Examples 1-5 The only difference between each comparative example and the embodiment is the type and ratio of components, as shown in Table 2.

[0053] In the components described in each embodiment and comparative example, 1) Polyphenylene ether resin The total mass concentration of polyphenylene ether resin 1, TMDQ and TMBP is 9 ppm, the intrinsic viscosity is 49 mL / g, the grade is XYRONS201A, and the manufacturer is Asahi Kasei. The total mass concentration of polyphenylene ether resin 2, TMDQ and TMBP is 18 ppm, the intrinsic viscosity is 41 mL / g, the grade is PPELXN040, and the manufacturer is Lanxing. The total mass concentration of polyphenylene ether resin 3, TMDQ and TMBP is 18 ppm, and the intrinsic viscosity is 49 mL / g. The preparation method of polyphenylene ether resin 3 is as follows: TMDQ is added to polyphenylene ether resin with a total mass concentration of 9 ppm (XYRON S201A) to make the total mass concentration of TMDQ and TMBP reach 18 ppm. The mass concentration of polyphenylene ether resin 4, TMDQ and TMBP is 32 ppm, the intrinsic viscosity is 40 mL / g, the grade is PPEZM040, and the manufacturer is Dalian Zhongmu.

[0054] 2) Polystyrene resin Polystyrene resin 1 (HIPS), rubber concentration 18.4wt%, average rubber particle size 1.3μm, grade PS350K, manufacturer: Kuo-Heng, Taiwan, China; Polystyrene resin 2 (HIPS), rubber concentration 24.1wt%, average rubber particle size 0.5μm, grade PH-888G, manufacturer Zhenjiang Chimei; 3) Flame retardants Flame retardant 1: includes bisphenol A bis(diphenyl phosphate) and magnesium hydroxide, with a mass ratio of bisphenol A bis(diphenyl phosphate) to magnesium hydroxide of 14:1; Flame retardant 2: includes bisphenol A bis(diphenyl phosphate) and magnesium hydroxide, with a mass ratio of bisphenol A bis(diphenyl phosphate) to magnesium hydroxide of 4:1.

[0055] Flame retardant 3: Bisphenol A bis(diphenyl phosphate); Flame retardant 4: Nitrogen-phosphorus flame retardant, melamine polyphosphate, brand name MPP, manufacturer: Zhenjiang Xingxing Flame Retardant Co., Ltd. Of the above flame retardants, the bisphenol A bis(diphenyl phosphate) is brand name MR-BDP, manufactured by Shandong Morui; the magnesium hydroxide is brand name Aitemag® 12FD, D50=1.0μm, manufactured by Jiangsu Aiteke. 4) Toughening agent Toughening agent 1 (ethylene terpolymer), ethylene-acrylate-glycidyl methacrylate, brand name ELVALOY™ PTW, manufacturer DuPont; according to standard ASTM D1238-2021, the melt mass flow rate at 190°C and 2.16 kg is 12 g / 10 min. Toughening agent 2 (ethylene terpolymer), name reactive ethylene-butyl acrylate-glycidyl methacrylate terpolymer, brand name LOTADER™ AX8750, manufacturer Arkema; ​​according to standard ASTM D1238-2023, the melt mass flow rate at 190°C and 2.16 kg is 10 g / 10 min. Toughening agent 3 (hydrogenated styrene-butadiene-styrene block copolymer), grade G1651, manufacturer: KETEN; Toughening agent 4: ethylene-methyl acrylate copolymer, grade AC 1125, manufacturer: DuPont.

[0056] 5) Gloss enhancers Gloss enhancer 1 (silica), with an average particle size of 6.3 μm, brand name Gasil AB905, manufacturer PQ; Gloss enhancer 2 (LLDPE), melt flow rate of 2.02 g / 10min, grade LLDPE DFDA-7042, manufacturer: PetroChina; Gloss enhancer 3 (PA6), grade PA6 J2000, according to standard GB / T 3682-2000, has a melt flow rate of 26.64 g / 10min at 230℃ and 0.325kg. Manufacturer: Hangzhou Juhua Shun.

[0057] 5) Processing aids Processing aids include antioxidants and lubricants, with a mass ratio of antioxidants to lubricants of 1:1; The antioxidant is a compound of RIANOX 1010 (commercially available) and RIANOX 168 (commercially available) in a mass ratio of 1:2; The lubricant is silicone, brand name MB50-004, manufactured by Dow Chemical.

[0058] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0059] Table 1. Content of each component (parts) in the materials of Examples 1-14 Table 2 shows the content (parts) of each component in the materials of Comparative Examples 1-5. Performance testing: 1) Vertical burning test: The vertical burning performance of flame-retardant polyphenylene oxide composite material was tested according to standard UL 94-2024, with a sample thickness of 3.0 mm; 2) Impact strength: Tested according to standard ISO 180:2023. The test method is a 2.75J pendulum impact at room temperature. The specimen is 80 mm x 10 mm x 4 mm with a 1eA notch. The impact energy is measured and the impact strength is calculated.

[0060] 3) Gloss test: Tested according to standard GB / T 8807-1998, with a test angle of 60° and a 60 mm x 60 mm x 2 mm injection molded color plate as the sample. The test position, material injection molding process, and mold are fixed.

[0061] 4) Yellowness test: Tested according to ASTM E313-20 (2025) standard. The sample is a 60 mm x 60 mm x 2 mm injection molded color plate, with fixed test position, fixed material injection molding process and mold.

[0062] The test results are shown in Tables 3 and 4.

[0063] Table 3. Material property test results of Examples 1-14 Table 4. Material property test results for Comparative Examples 1-5 According to the data in Table 3, the polyphenylene ether composite material of the present invention has excellent matte finish, impact resistance, and flame retardant properties, with a vertical flammability rating of V0, a ​​gloss level not exceeding 36, and an impact strength not less than 14 kJ / m².2 The yellowness level should not exceed 12.4.

[0064] According to the data in Table 4, in Comparative Example 1, the higher the mass concentration of TMDQ and TMBP in the polyphenylene ether resin, the greater the yellowness of the material, the lower the gloss, and the lower the performance. In Comparative Examples 2 and 3, the addition of only a single toughening agent resulted in a decrease in the flame retardant and mechanical properties of the material. In Comparative Example 4, the use of a combination of ethylene-methyl acrylate copolymer and hydrogenated styrene-butadiene-styrene block copolymer as a toughening agent reduced both gloss and toughness. In Comparative Example 5, no gloss enhancer was added and a single toughening agent was used, resulting in a significant increase in gloss.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polyphenylene ether composite material, characterized in that, By weight, it includes the following components: The mixture comprises 38-62 parts of polyphenylene ether resin, 18-37 parts of polystyrene resin, 8-22 parts of flame retardant, and 1-8 parts of toughening agent; the total mass concentration of 3,3',5,5'-tetramethyl-4,4'-biphenylquinone and 3,3',5,5'-tetramethylbiphenylhydrazine in the polyphenylene ether resin is 8 ppm to 30 ppm. The toughening agent includes ethylene terpolymer and hydrogenated styrene-butadiene-styrene block copolymer.

2. The polyphenylene ether composite material as described in claim 1, characterized in that, The mass ratio of the ethylene terpolymer to the hydrogenated styrene-butadiene-styrene block copolymer is 1:(1-2).

3. The polyphenylene ether composite material as described in claim 1, characterized in that, The product also includes 1 to 8 parts by weight of gloss modifier and / or 0.4 to 3.2 parts by weight of processing aid. Preferably, the gloss modifier includes silica and LLDPE, and the mass ratio of silica to LLDPE is 1:(1 to 3).

4. The polyphenylene ether composite material as described in claim 1, characterized in that, The intrinsic viscosity of the polyphenylene ether resin is 30~55 mL / g.

5. The polyphenylene ether composite material as described in claim 1, characterized in that, The polystyrene resin includes high-impact polystyrene, wherein the rubber content in the high-impact polystyrene is 15wt%~25wt%, and the average particle size of the rubber is 0.5~1.5μm.

6. The polyphenylene ether composite material according to claim 1, characterized in that, The flame retardant includes at least one of phosphate ester compounds, metal hydroxides, silicon-based flame retardants, nitrogen-based flame retardants, and nitrogen-phosphorus-based flame retardants; preferably, the flame retardant includes metal hydroxides and phosphate ester compounds, wherein the mass ratio of the metal hydroxides to the phosphate ester compounds is 1:(3~18).

7. The polyphenylene ether composite material according to claim 3, characterized in that, The silica has an average particle size of 5.0-7.5 μm; and / or the LLDPE has a melt flow rate of 1.6-2.4 g / 10 min at 190°C and 2.16 kg, according to standard ISO 1133-1-2022.

8. The polyphenylene ether composite material as described in claim 3, characterized in that, The processing aids include at least one of lubricant, antioxidant, and colorant; and / or, the ethylene terpolymer includes an ethylene-acrylate-glycidyl methacrylate terpolymer.

9. A method for preparing the polyphenylene ether composite material according to any one of claims 1 to 8, characterized in that, Includes the following steps: The components are mixed evenly and melt-extruded to obtain the polyphenylene ether composite material.

10. The application of the polyphenylene ether composite material according to any one of claims 1 to 8 in industrial control enclosures, household appliance enclosures or photovoltaic energy storage device enclosures.

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