A polyphenyl ether composite material and a preparation method and application thereof

Abstract

The application discloses a kind of polyphenyl ether composite material and its preparation method and application, belong to high polymer material technical field;The polyphenyl ether composite material provided by the application includes the following components by mass fraction: 53-82 parts of polyphenyl ether resin, 8-22 parts of polystyrene resin, 0.3-2.2 parts of composite stabilizer;The composite stabilizer includes phosphite antioxidant, thiol antioxidant and carbon radical trapping agent;In the polyphenyl ether resin, the mass content of monomer phenol is ≤10ppm, and the mass content of biphenyl diquinone is ≤50ppm.The polyphenyl ether composite material provided by the application can simultaneously realize good extrusion processability of product by selecting appropriate mass fraction of components, and the initial b value of the extruded product is moderate, and it also has excellent storage color stability.

Description

Technical Field

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

[0002] Polyphenylene oxide (PPE or PPO) resin is a high-performance engineering plastic. Due to its excellent dimensional stability, hydrolysis resistance, high glass transition temperature, and excellent dielectric properties, it is often compounded with polystyrene resin and widely used in electronics, home appliances, automobiles, and medical devices. Especially for light-colored, off-white, or pale yellow products with strict appearance requirements, such as high-end appliance housings, smart home panels, and medical device housings, PPE resin products not only need a suitable initial b-value but also need to maintain their initial color well; that is, excellent storage color stability is required. Furthermore, since PPE resin products are produced through continuous extrusion, certain requirements are placed on color stability before and after continuous extrusion processing to meet production demands and improve efficiency.

[0003] Existing technologies, such as patents CN101717501B and CN119798646A, mention reducing the mass content of biphenyl diquinone in polyphenylene ether resin to improve its heat resistance to some extent. However, biphenyl diquinone in polyphenylene ether resin is difficult to completely remove. Although the presence of trace amounts of biphenyl diquinone has little impact on the initial b-value, it can cause severe chain oxidative degradation of PPE resin under stress from heat, oxygen, and shear during continuous extrusion, leading to a sharp deterioration in color. This results in a large color change before and after continuous extrusion, failing to meet the requirements for stable continuous extrusion. Furthermore, due to the differences between the factors affecting yellowing during continuous extrusion and those affecting yellowing during long-term storage, current technologies lack a stabilization strategy that can synergistically address these two different oxidation mechanisms. This often results in PPE products exhibiting one-sided performance characteristics: "good for processing but not for storage" or "good for storage but not for processing." Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a polyphenylene ether composite material with good continuous extrusion processability, an extruded product with a suitable initial b value, and excellent storage color stability, as well as its preparation method and application.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a polyphenylene ether composite material comprising the following components in parts by weight: 53-82 parts polyphenylene ether resin, 8-22 parts polystyrene resin, 0.3-2.2 parts composite stabilizer; The composite stabilizer includes phosphite antioxidants, thiol antioxidants, and carbon free radical scavengers; In the polyphenylene ether resin, the mass content of monomer phenol is ≤10ppm and the mass content of biphenyl diquinone is ≤50ppm; The phosphorus content in the phosphite antioxidant is greater than 5% by mass.

[0006] The polyphenylene ether composite material provided by this invention, by selecting appropriate mass fractions of components and coordinating the components with each other, can simultaneously achieve good continuous extrusion processability of the product. Specifically, it exhibits excellent color stability after continuous extrusion for 30 minutes, and the extruded product has a suitable initial b value (exhibiting a pale yellow color). At the same time, the obtained product also has excellent storage color stability.

[0007] Specifically, this invention limits the mass content of monomers phenol and biphenyl diquinone in the polyphenylene ether resin to a certain range, which can reduce intrinsic chromophores and unstable sources from the resin end, laying the material basis for obtaining a suitable initial b-value range and low intrinsic yellowing tendency. Simultaneously, the composite stabilizer of this invention, in which phosphite antioxidants, thiol antioxidants, and carbon radical scavengers with phosphorus mass content within a certain range, can synergistically improve color stability against acute thermo-oxidative stress during continuous extrusion processing and chronic oxidative stress during storage, and help stabilize the initial b-value of the product within a suitable range. More specifically, phosphite antioxidants with phosphorus content within a certain range act as peroxide decomposers. During continuous extrusion processing, they can rapidly decompose and generate large amounts of hydroperoxides, effectively interrupting the branching pathway of the oxidation chain reaction. Carbon radical scavengers can directly capture alkyl radicals and other free radicals generated in the oxidation chain reaction, interrupting the growth of the oxidation chain reaction. They are effective not only during extrusion processing but also during long-term storage. In addition, although thiol antioxidants may cause color contamination to some extent, causing the initial b-value to deviate from the suitable range and resulting in a yellowing trend in the product, they can improve the thermal stability of the composite stabilizer and also improve the color stability during storage. Furthermore, thiol antioxidants also have a certain ability to react with free radicals, thereby assisting carbon radical scavengers and providing additional free radical quenching capabilities, helping to simultaneously improve color stability during extrusion processing and color stability during storage.

[0008] It should be noted that the monomer phenol is dimethylphenol, a monomer in polyphenylene ether resin.

[0009] For example, the polyphenylene ether resin can be any point value or any two-point range value between 53 and 82 parts, such as 55-80 parts, or 53 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, 80 parts, 82 parts, etc.; the polystyrene resin can be any point value or any two-point range value between 8 and 22 parts, such as 10-20 parts, or 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, etc.; the composite stabilizer can be any point value or any two-point range value between 0.3 and 2.2 parts, such as 0.5-2 parts, or 0.3 parts, 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, etc.

[0010] Preferably, in the polyphenylene ether composite material, the mass percentage of polyphenylene ether resin is ≥48%.

[0011] More preferably, in the polyphenylene ether composite material, the mass percentage of polyphenylene ether resin is 65-75%.

[0012] Preferably, the mass percentage of the composite stabilizer in the polyphenylene ether composite material is 0.5-2%.

[0013] It should be noted that the test method for the mass content of monomer phenol and biphenyl diquinone in the polyphenylene ether resin is as follows: the polyphenylene ether resin is dissolved in chloroform solution at a solution ratio of 1g / 10mL, precipitated with methanol, and then filtered to obtain the filtrate. The filtrate is tested by GC-MS (injection port temperature is 280-320℃, injection volume is 1-10μL). At the same time, standard solutions with contents of 1-100ppm are prepared by dissolving dimethylphenol and biphenyl diquinone in chloroform in advance. After methanol precipitation, the solutions are tested by the GC-MS instrument. The integral area corresponding to the standard solutions with different contents is calculated. That is, the content of monomer phenol and biphenyl diquinone in polyphenylene ether resin is quantitatively tested by testing the content of the standard solutions by GC-MS.

[0014] For example, in the polyphenylene ether resin, the mass content of the monomer phenol can be any point value or any two points within a range of ≤10ppm, such as 2-10ppm, 2-3ppm, 2-8ppm, 3-8ppm, or 2ppm, 3ppm, 4ppm, 5ppm, 6ppm, 7ppm, 8ppm, 9ppm, 10ppm, etc.

[0015] For example, the mass content of biphenyl diquinone in the polyphenylene ether resin can be any point value or any two points within a range of ≤50 ppm, such as 5-50 ppm, 5-30 ppm, 5-45 ppm, 5-15 ppm, 15-30 ppm, 15-45 ppm, 30-45 ppm, etc., or 5 ppm, 10 ppm, 15 ppm, 20 ppm, 25 ppm, 30 ppm, 35 ppm, 40 ppm, 45 ppm, 50 ppm, etc.

[0016] Preferably, in the polyphenylene ether resin, the mass content of the monomer phenol is 2-3 ppm and the mass content of biphenyl diquinone is 5-30 ppm.

[0017] Preferably, the phosphorus content in the phosphite antioxidant is 5.1-10% by mass.

[0018] For example, in the phosphite antioxidant, the mass content of phosphorus can be any point value or any two points between 5.1% and 10%, such as 5.1-9.8%, 5.1-7.3%, 7.3-9.8%, or 5.1%, 6%, 7%, 8%, 9%, 10%, etc.

[0019] It should be noted that the test method for the phosphorus content in the phosphite antioxidant is as follows: inductively coupled plasma atomic emission spectrometry (ICP-AES). The specific test is as follows: 1) Microwave digestion: Weigh 0.1-0.3g of sample, add 12mL of 65-68wt% nitric acid aqueous solution - 30wt% hydrogen peroxide aqueous solution (volume ratio 5:1), microwave temperature up to 200℃, keep warm for 30min, cool and then make up to 50mL. 2) Instrument conditions: power 1.2-1.5kW, atomizing gas flow rate 0.8-1.0L / min, selected for verification using phosphorus dual spectral lines at 213.618nm and 214.914nm; 3) Quantitative analysis: Plot curves using a series of phosphorus standard solutions (0.1-10 mg / L), and matrix matching is used to eliminate interference.

[0020] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the polyphenylene ether composite material comprises the following components in parts by weight: 65-70 parts polyphenylene ether resin, 14-16 parts polystyrene resin, and 1-1.6 parts composite stabilizer.

[0021] The present invention has found that the mass fraction of a component in a polyphenylene ether composite material affects the overall performance of the component. When the mass fraction of the component is further selected within the above range, the initial b value of the obtained polyphenylene ether composite material is within a suitable range, and the color stability during extrusion processing and storage is better.

[0022] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the mass ratio of the phosphite antioxidant, the thiol antioxidant and the carbon free radical scavenger is 1:(0.2-1):(0.2-1).

[0023] For example, the mass ratio of the phosphite antioxidant, the thiol antioxidant, and the carbon radical scavenger can be any point value or any two points within the range of 1:(0.2-1):(0.2-1), such as 1:0.2:0.2, 1:0.2:0.4, 1:0.2:0.6, 1:0.2:0.8, 1:1:1, 1:0.5:0.2, 1:0.5:0.4, 1:0.5:0.6, 1:0.5:0.8, 1:0.5:1, 1:1:0.2, 1:1:0.4, 1:1:0.6, 1:1:0.8, 1:1:1, etc.

[0024] Preferably, the mass ratio of the phosphite antioxidant, the thiol antioxidant, and the carbon free radical scavenger is 1:(0.5-0.8):(0.4-0.6).

[0025] This invention has found that the mass ratio of phosphite antioxidants, thiol antioxidants, and carbon radical scavengers affects their interaction, thereby influencing initial whiteness, color stability during continuous extrusion, and storage stability. When the mass ratio of the three is further selected within the above-mentioned range, especially within a more preferred range, the resulting product can effectively balance the initial b-value within a suitable range, the stability during continuous extrusion, and the storage stability, thereby improving the overall performance of the product.

[0026] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the phosphite antioxidant includes at least one of bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis(octadecyl alcohol) pentaerythritol diphosphite, bis(2,4-di-tert-butylphenol) pentaerythritol diphosphite, and bis(2,4-dicumylphenyl) pentaerythritol-diphosphite.

[0027] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the thiol antioxidant includes at least one of pentaerythritol tetra(3-lauryl thiopropionate) and dioctadecyl thiodipropionate.

[0028] In a preferred embodiment of the polyphenylene ether composite material of the present invention, the carbon free radical scavenger includes at least one of benzofuranones and hydroxylamines.

[0029] Preferably, the benzofuranones include at least one of xylyldibutylbenzofuranone and xylyldibutylbenzofuranone derivatives.

[0030] Preferably, the hydroxylamine class includes at least one of dioctaneamine and N,N-diethylhydroxylamine.

[0031] This invention has found that when phosphite antioxidants, thiol antioxidants, and carbon radical scavengers are further selected as substances of the above types, the initial b-value of the obtained product is within a more suitable range, and the color stability during continuous extrusion processing and storage is better.

[0032] In a preferred embodiment of the polyphenylene ether composite material of the present invention, the intrinsic viscosity of the polyphenylene ether resin in chloroform solvent at 25°C is 30-55 cm⁻¹. 3 / g.

[0033] It should be noted that the test method for the intrinsic viscosity of the polyphenylene ether resin is as follows: the test shall be conducted in accordance with GB / T 41874-2022.

[0034] For example, the intrinsic viscosity of the polyphenylene ether resin in chloroform solvent at 25°C can be 30-55 cm⁻¹. 3 Any point value between / g or any range between two points, for example, 32.5-52cm. 3 / g, 32.5-48cm 3 / g, 32.5-46cm 3 / g, 32.5-40cm 3 / g, 32.5-37cm 3 / g、40-46cm 3 / g, or 30cm 3 / g、32cm 3 / g, 35cm 3 / g, 38cm 3 / g、40cm 3 / g、42cm 3 / g、45cm 3 / g、48cm 3 / g, 50cm 3 / g、52cm 3 / g、55cm 3 / g etc.

[0035] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the polystyrene resin has a melt flow rate of 2-12 g / 10 min at 200°C and 5 kg.

[0036] It should be noted that the test method for the melt flow rate of the polystyrene resin at 200℃ and 5kg is as follows: the test is conducted in accordance with the standard ISO 1133-1-2011.

[0037] For example, the melt flow rate of the polystyrene resin at 200°C and 5 kg can be any point value or any range between two points between 2 and 12 g / 10 min, such as 3-11 g / 10 min, or 2 g / 10 min, 3 g / 10 min, 5 g / 10 min, 8 g / 10 min, 10 g / 10 min, 11 g / 10 min, 12 g / 10 min, etc.

[0038] As a preferred embodiment of the polyphenylene ether composite material of the present invention, the polyphenylene ether composite material further includes the following components in parts by weight: 0.5-8.5 parts toughening agent and 3-22 parts organophosphorus flame retardant.

[0039] For example, the toughening agent includes at least one of styrene-butadiene-styrene block copolymer, styrene-ethylene / butene-styrene block copolymer, and styrene-ethylene / propylene-styrene block copolymer.

[0040] For example, the organophosphorus flame retardant includes at least one of bisphenol A bis(diphenyl phosphate) and resorcinol bis(diphenyl phosphate).

[0041] In a second aspect of the present invention, the present invention provides a method for preparing the polyphenylene ether composite material, the method comprising the following steps: mixing the components uniformly and then performing melt kneading, followed by extrusion granulation to obtain the polyphenylene ether composite material.

[0042] In a preferred embodiment of the preparation method of the present invention, the temperature of the melt mixing is 80-270℃, and the screw speed during the melt mixing is 200-500 r / min.

[0043] In a third aspect, the present invention provides the application of the polyphenylene ether composite material in the preparation of electronic and electrical appearance parts.

[0044] For example, the electronic and electrical appearance components include laptop casings, printer casings, 5G base station antenna covers, radio frequency module casings, etc.

[0045] In a fourth aspect, the present invention provides a component prepared using the polyphenylene ether composite material described herein.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows: The polyphenylene ether composite material provided by this invention, by selecting appropriate mass parts of components and coordinating the components with each other, can simultaneously achieve good continuous extrusion processability of the product, and the extruded product has a suitable initial b value, while the obtained product also has excellent storage color stability. Attached Figure Description

[0047] Figure 1 The image shows a square plate prepared using the polyphenylene ether composite material prepared in Example 1 for the b-value test. Figure 2 The image shows a square plate prepared using the polyphenylene ether composite material prepared in Comparative Example 3 for the b-value test. Detailed Implementation

[0048] 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.

[0049] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in the field; and unless otherwise specified, the raw materials used in parallel experiments are from the same batch.

[0050] Polyphenylene ether resin 1: The intrinsic viscosity in chloroform solvent at 25°C was measured to be 46 cm⁻¹. 3 / g, the measured content of monomeric phenol was 2ppm, the measured content of biphenyl diquinone was 5ppm, PPE PX100L, Mitsubishi, Japan; Polyphenylene ether resin 2: The intrinsic viscosity in chloroform solvent at 25°C was measured to be 48 cm⁻¹. 3 / g, the measured content of monomeric phenol was 3ppm, the measured content of biphenyl diquinone was 30ppm, PPE LXR050, Nantong Xingchen Synthetic Materials Co., Ltd.; Polyphenylene ether resin 3: The intrinsic viscosity in chloroform solvent at 25°C was measured to be 45 cm⁻¹. 3 / g, the actual mass content of monomeric phenol was 8ppm, and the actual mass content of biphenyl diquinone was 45ppm. It was prepared in-house by adding dimethylphenol and biphenyl diquinone to PPE PX100L (Mitsubishi, Japan) and mixing them evenly. The intrinsic viscosity of polyphenylene ether resin 4 in chloroform solvent at 25°C was measured to be 32.5 cm⁻¹. 3 / g, the measured content of monomeric phenol was 2ppm, the measured content of biphenyl diquinone was 15ppm, PPE LXN030, Nantong Xingchen Synthetic Materials Co., Ltd.; Polyphenylene ether resin 5: The intrinsic viscosity in chloroform solvent at 25°C was measured to be 52 cm⁻¹. 3 / g, the measured content of monomeric phenol was 2ppm, the measured content of biphenyl diquinone was 5ppm, PPE S201A, Asahi Kasei Corporation; Polyphenylene ether resin 6: The intrinsic viscosity in chloroform solvent at 25°C was measured to be 37 cm⁻¹. 3 / g, the measured content of monomeric phenol was 12ppm, the measured content of biphenyl diquinone was 62ppm, PPE LXR035, Nantong Xingchen Synthetic Materials Co., Ltd.; Polystyrene resin 1: The measured melt flow rate at 200℃ and 5kg was 3.0 g / 10min, PS350S, Guoheng Chemical Co., Ltd. Polystyrene resin 2: The measured melt flow rate at 200℃ and 5kg was 11.0 g / 10min, HIPSHP825T, Guangdong Shengchan Petrochemical Co., Ltd. Phosphite antioxidant 1: Bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, PEP-36, phosphorus content 9.8%, Japan Adico; Phosphite antioxidant 2: Bis(2,4-dicumylphenyl)pentaerythritol-diphosphite, S-9228, phosphorus content 7.3%, Shanghai Puzhan Industrial Co., Ltd.; Phosphite antioxidant 3: Tris(2,4-di-tert-butylphenyl) phosphite, phosphorus content 4.8%, Tianjin Lianlong New Material Co., Ltd.; Thiol antioxidant 1: Pentaerythritol tetra(3-Lauryl thiopropionate), RIANOX 412S, Tianjin Lianlong New Material Co., Ltd.; Thiol antioxidant 2: Dioctyl thiodipropionate, antioxidant-DSDTP, Hangzhou Jingyou Chemical Co., Ltd.; Hindered phenolic antioxidants: Dithioethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], Antioxidant 1035, Wuhan Fuxin Chemical Co., Ltd.; Carbon radical scavenger 1: xylyl dibutylbenzofuranone, HP-136, Shanghai Puzhan Industrial Co., Ltd.; Carbon radical scavenger 2: Dioctaneamine, Revonox 420V, Qitai Technology; Carbon radical scavenger 3: 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl ester, Qingdao Jiedejia New Material Technology Co., Ltd. Toughening agent: Hydrogenated styrene-butadiene-styrene block copolymer, SEBS 6151, TSRC Corporation; Organophosphorus flame retardant: Bisphenol A-bis(diphenyl phosphate), WSFR-NDP-N2, Zhejiang Wansheng Co., Ltd.; The components and mass fractions of the composite stabilizer are shown in Table 1. Table 1 Examples 1-14 and Comparative Examples 1-8 The present invention provides a polyphenylene ether composite material in the embodiments and comparative examples, wherein the component content (parts by weight) of the polyphenylene ether composite material is shown in Tables 2-4; Table 2 Table 3 Table 4 The preparation method of the polyphenylene ether composite material provided in Example 1 is as follows: After the components are mixed evenly, they are added to a twin-screw extruder for melt mixing. There are 11 stages in total. The temperatures of the first to the eleventh stages are 80℃, 150℃, 270℃, 270℃, 260℃, 240℃, 240℃, 260℃, 270℃, and 270℃, respectively. The screw speed is 400 r / min. After melt mixing, the product is extruded and granulated to obtain a polyphenylene ether composite material.

[0051] The preparation methods of the polyphenylene ether composite materials provided in Examples 2-14 and Comparative Examples 1-8 are consistent with those in Example 1, except that the relevant components are not required.

[0052] Example of effect The performance of the polyphenylene ether composite materials prepared in the examples and comparative examples of this invention is verified by the following aspects: 1. b-value test: Specifically, the polyphenylene ether composite material was continuously extruded for 2 minutes using the extrusion conditions described in Example 1. The extruded polyphenylene ether composite material was then injection molded into a 60×60×2mm (length×width×thickness) square plate at 280℃. The b-value of the color plate was tested using an X-Rite 7000A colorimeter. In the system of this invention, the b-value can effectively characterize the initial color of the material or the degree of yellowing after continuous extrusion for 2 minutes. Specifically, b-value < 15: very light yellow tone, bluish hue, light yellow; b-value 15-18: moderate yellow tone, visually natural and soft; b-value > 18: significantly intensified hue, perceptible yellowing. 2. Extrusion Color Stability: Specifically, the extrusion conditions of the preparation method in Example 1 were used for continuous extrusion for 30 minutes. The color change amplitude was tested after 2 minutes of continuous extrusion and after 30 minutes of continuous extrusion, and the value was ΔE1. ​​The calculation formula is ΔE1 = (ΔL) / (ΔE1 + ΔE1 + ΔE1) / ( ... 2 +△b 2 +△a 2 )^0.5, where △L, △b, and △a are the differences in L, a, and b values, respectively, between the continuous extrusion for 2 minutes and continuous extrusion for 30 minutes, when the material is injected into a 60×60×2mm (length×width×thickness) sample. 3. Storage stability: The product obtained after continuous extrusion for 2 minutes in the extrusion color stability test was placed at a temperature of 23℃ and a humidity of 50% for 168 hours. The color change after 0 days and 168 hours was then measured as ΔE2, calculated using the formula ΔE2 = (ΔL) / (ΔE2 - ΔE2) * (ΔL) / (ΔE2 - ΔE2) 2 +△b 2 +△a 2 )^0.5, where △L, △b, and △a are the differences in L, a, and b values, respectively, between the materials placed for 0 days and 168 hours, when the materials were injection molded into a 60×60×2mm (length×width×thickness) sample. The results of the above tests are shown in Table 5. Table 5 As can be seen from Table 5, when the technical solution provided by this invention is adopted, the obtained product simultaneously possesses a suitable b-value range, as well as excellent extrusion color stability and storage color stability; specifically, the b-value of the obtained product is between 16.2 and 17.8, the ΔE1 in the extrusion color stability test is below 0.58, and the ΔE2 in the storage color stability test is below 0.35; the photograph of the square plate in the b-value test of Example 1 is shown below. Figure 1 As shown, the photograph of the square plate in the b-value test of Comparative Example 3 is as follows. Figure 2 As shown; As can be seen from Examples 1, 4-5 and Comparative Example 1, when the mass content of monomers phenol and biphenyl diquinone in polyphenylene ether resin is outside the range given in this invention, the initial whiteness of the obtained product decreases, and the color stability during continuous extrusion and storage also decreases significantly. As can be seen from Examples 1 and Comparative Examples 2-4, when the types of phosphite antioxidants, thiol antioxidants and carbon free radical scavengers in the composite stabilizer are not within the range given in this invention, the initial whiteness of the obtained product decreases significantly, and the color stability of continuous extrusion also decreases significantly. As can be seen from Example 1 and Comparative Examples 5-7, when any one or two of the composite stabilizers are missing, the initial whiteness of the obtained product decreases significantly, and the color stability during continuous extrusion and storage also decreases to some extent. As can be seen from Example 1 and Comparative Example 8, when the amount of composite stabilizer added is not within the range given in this invention, the initial whiteness of the obtained product decreases to a certain extent.

[0053] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not 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, The polyphenylene ether composite material comprises the following components in parts by weight: 53-82 parts polyphenylene ether resin, 8-22 parts polystyrene resin, 0.3-2.2 parts composite stabilizer; The composite stabilizer includes phosphite antioxidants, thiol antioxidants, and carbon free radical scavengers; In the polyphenylene ether resin, the mass content of monomer phenol is ≤10ppm and the mass content of biphenyl diquinone is ≤50ppm; The phosphorus content in the phosphite antioxidant is greater than 5% by mass.

2. The polyphenylene ether composite material according to claim 1, characterized in that, The polyphenylene ether composite material comprises the following components in parts by weight: 65-70 parts polyphenylene ether resin, 14-16 parts polystyrene resin, 1-1.6 parts composite stabilizer.

3. The polyphenylene ether composite material according to claim 1, characterized in that, The mass ratio of the phosphite antioxidant, the thiol antioxidant, and the carbon free radical scavenger is 1:(0.2-1):(0.2-1).

4. The polyphenylene ether composite material according to claim 1, characterized in that, The phosphite antioxidants include at least one of bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis(octadecyl alcohol) pentaerythritol diphosphite, bis(2,4-di-tert-butylphenol) pentaerythritol diphosphite, and bis(2,4-dicumylphenyl) pentaerythritol-diphosphite. And / or, the thiol antioxidant includes at least one of pentaerythritol tetra(3-lauryl thiopropionate) and dioctadecyl thiodipropionate; And / or, the carbon radical scavenger includes at least one of benzofuranones and hydroxylamines.

5. The polyphenylene ether composite material according to claim 1, characterized in that, The intrinsic viscosity of the polyphenylene ether resin in chloroform solvent at 25°C is 30-55 cm⁻¹. 3 / g.

6. The polyphenylene ether composite material according to claim 1, characterized in that, The polystyrene resin has a melt flow rate of 2-12 g / 10 min at 200°C and 5 kg.

7. The polyphenylene ether composite material according to claim 1, characterized in that, The polyphenylene ether composite material also includes the following components in parts by weight: 0.5-8.5 parts toughening agent and 3-22 parts organophosphorus flame retardant.

8. The method for preparing the polyphenylene ether composite material according to any one of claims 1-7, characterized in that, The preparation method includes the following steps: After the components are mixed evenly, they are melt-blended and then extruded and granulated to obtain a polyphenylene ether composite material.

9. The use of the polyphenylene ether composite material as described in any one of claims 1-7 in the preparation of electronic and electrical appearance parts.

10. A component, characterized in that, The component is prepared using the polyphenylene ether composite material as described in any one of claims 1-7.

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