A low odor, low voc modified polyphenylene ether composition and method of making the same

Abstract

The application belongs to the technical field of high polymer material modification and automobile interior material, and discloses a low-odor low-VOC modified polyphenyl ether composition and a preparation method thereof. The composition comprises the following components in mass fractions: a polyphenyl ether matrix resin, a polystyrene resin, a nitrogen-containing heterocyclic primary end-capping agent, an epoxy secondary end-capping agent containing branched aliphatic side groups, and a porous inorganic adsorption medium. Through the synergistic technology of "pure addition reaction + steric hindrance + micropore physical anchoring", the generation and emission of phenolic hydroxyl degradation products and free amines are significantly inhibited from the dual dimensions of reaction path and physical structure.

Description

Technical Field

[0001] This invention belongs to the technical field of polymer material modification and automotive interior materials. This invention relates to a low-odor, low-VOC modified polyphenylene ether composition and its preparation method. Background Technology

[0002] Polyphenylene oxide (PPO) and high-strength polystyrene (HIPS) blends are widely used in automotive interior components (such as dashboard frames and center consoles) due to their excellent dimensional stability, heat resistance, and comprehensive mechanical properties. However, as the automotive industry's requirements for in-vehicle air quality (VIAQ) standards (such as Volkswagen's PV 3900 odor test and VDA 278 thermal desorption VOC emission test) become increasingly stringent, the release of volatile organic compounds (VOCs) and odors from modified PPO materials during high-temperature processing and use has become a pressing technical bottleneck that needs to be addressed.

[0003] In existing technologies, the sources of odor and VOCs in polyphenylene oxide (PPO) mainly come from two aspects: First, the phenolic hydroxyl groups at the ends of the PPO molecular chains are highly susceptible to thermo-oxidative degradation under high-temperature melt processing (260~300℃), resulting in main chain breakage and the generation of low-molecular-weight volatiles such as benzaldehyde and acetophenone, leading to a distinct burnt odor in the material. Second, trace amounts of catalyst (usually copper-amine complexes) inevitably remain during the polymerization process of PPO. These residues form Mannich base structures at the polymer chain ends. Under the high-temperature and strong shearing action of extrusion or injection molding, the dibutylamine groups in this structure are highly susceptible to CN bond breakage, releasing free dibutylamine with a strong, pungent, fishy odor.

[0004] Chinese patent CN 102850765B discloses a method for dissolving small molecule gases generated in PPO / HIPS blends by adding solvent-based additives (0.5~5%) to the feed port of a twin-screw extruder and then expelling them through a vacuum exhaust port. This method is a purely physical devolatilization approach. However, physical devolatilization can only remove already generated volatiles and cannot stop the continuous thermo-oxidative degradation of phenolic hydroxyl groups at the source; it also cannot inhibit the continuous release of dibutylamine from Mannich base end groups during secondary processing (such as injection molding), making it difficult for the manufactured parts to consistently meet the stringent automotive-grade requirements of PV 3900 odor rating ≤2.5 and VDA 278 extremely low VOC / FOG emissions.

[0005] Another existing technology uses salicylic acid esters or anhydride-based end-capping agents to block the phenolic hydroxyl groups at the PPO ends. While these end-capping agents can react with the phenolic hydroxyl groups, they inevitably release small molecule byproducts such as carbon dioxide and acetic acid during the reaction, which can easily lead to microfoaming in the extruded strip or introduce new acidic VOC residues into the system. Conventional end-capping agents have small molecular sizes and cannot effectively overcome the steric hindrance formed by the dibutylamine group at the Mannich base end group, resulting in low blocking efficiency for the Mannich base structure, and the risk of free dibutylamine release remains.

[0006] Therefore, there is an urgent need in this field to develop a novel technical solution that can both block end groups through a chemical pathway without the generation of small molecule byproducts and construct effective physical or chemical shielding barriers for the difficult-to-handle Mannich base structure, thereby systematically reducing the odor and VOCs of modified polyphenylene ether materials. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies and solve the problem of volatile organic compounds and odors released by modified polyphenylene ether during high-temperature processing and use, this invention provides a low-odor, low-VOC modified polyphenylene ether composition and its preparation method. This invention pioneers a synergistic technology of "pure addition reaction + steric hindrance + microporous physical anchoring," which, through the targeted synergistic effect of multiple components, significantly inhibits the generation and emission of phenolic hydroxyl degradation products and free dibutylamine from both the reaction pathway and physical structure dimensions.

[0008] The above-mentioned objective of this invention is achieved through the following technical solution: A low-odor, low-VOC modified polyphenylene ether composition, by weight parts, comprises the following components: by weight parts; polyphenylene ether matrix resin, polystyrene resin, nitrogen-containing heterocyclic primary end-capping agent, epoxy secondary end-capping agent containing branched aliphatic side groups, and porous inorganic adsorption medium. The total mass of polyphenylene ether (PPE) matrix resin and polystyrene resin is 100-120 parts, with 2-6 parts of nitrogen-containing heterocyclic primary end-capping agent, 1-5 parts of epoxy secondary end-capping agent with branched aliphatic side groups, and 0.5-3 parts of porous inorganic adsorption medium. The nitrogen-containing heterocyclic primary end-capping agent forms an aromatic ether-amide bond structure with the chain ends of the PPE matrix resin. After the epoxy secondary end-capping agent with branched aliphatic side groups reacts with the residual active sites at the chain ends of the PPE matrix resin, a steric hindrance shielding structure is formed at the chain ends. The porous inorganic adsorption medium physically anchors the remaining trace small molecules. The mass ratio of PPE matrix resin to polystyrene resin is 50-70: 30-50.

[0009] Furthermore, nitrogen-containing heterocyclic primary end-capping agents undergo ring-opening addition reactions with the terminal phenolic hydroxyl groups of polyphenylene ether to form aromatic ether-amide bonds.

[0010] Furthermore, the nitrogen-containing heterocyclic primary end-capping agent is a compound containing at least one oxazoline ring structure. The nitrogen-containing heterocyclic primary end-capping agent is selected from any one or more of 1,3-phenylenebisoxazoline, phenyloxazoline, polystyrene-grafted oxazoline, 2,2'-bis(2-oxazoline), or 4,4'-bis(2-oxazoline)biphenyl.

[0011] Furthermore, the epoxy secondary capping agent containing branched aliphatic side groups is any one or more of glycidyl neodecanoate, glycidyl tert-carbonate, epoxidized soybean oil, or epoxidized linseed oil.

[0012] Furthermore, the intrinsic viscosity of the polyphenylene ether matrix resin, measured in chloroform at 25°C, is 0.35~0.45 dL / g.

[0013] Furthermore, the porous inorganic adsorption medium is preferably any one or more of zeolite molecular sieves, mesoporous silica, or activated carbon with a pore size of 3 Å to 10 Å.

[0014] Furthermore, the composition also includes antioxidants, including hindered phenolic antioxidants and phosphite antioxidants, wherein the mass ratio of hindered phenolic antioxidants to phosphite antioxidants is 1:0.5~2, and the total mass fraction of hindered phenolic antioxidants and phosphite antioxidants is 0.1-1 parts.

[0015] Furthermore, the hindered phenolic antioxidant is antioxidant 1010, and the phosphite antioxidant is antioxidant 168.

[0016] This invention also claims protection for the preparation method of the above-mentioned low-odor, low-VOC modified polyphenylene ether composition. The preparation method adopts a multi-stage sequential reaction process using a twin-screw extruder. The temperature of the first-stage reaction zone is controlled at 280~290℃, and the temperature of the second-stage reaction zone is controlled at 275~280℃. The epoxy secondary end-capping agent containing branched aliphatic side groups and the porous inorganic adsorption medium are added in a delayed manner. The trace residues are removed in a deep vacuum devolatilization zone.

[0017] Specifically, the following steps are included: S1. Add polyphenylene ether matrix resin, polystyrene resin, nitrogen-containing heterocyclic primary end-capping agent and antioxidant to the twin-screw extruder through the main feed port; S2. In the primary reaction zone of the twin-screw extruder, the temperature is controlled at 280~290℃ to allow the nitrogen-containing heterocyclic primary end-capping agent to undergo a ring-opening addition reaction with the phenolic hydroxyl groups at the chain ends of the polyphenylene ether matrix resin. S3. In the secondary reaction zone of the twin-screw extruder, the temperature is controlled at 275~280℃. The epoxy secondary end-capping agent containing branched aliphatic side groups is added in a delayed manner through a liquid metering pump (injection pressure 1.5~3.0 MPa, preheating temperature 40~60℃), and a porous inorganic adsorption medium is added through the side feed port. S4. In the deep vacuum devolatilization zone of a twin-screw extruder, the absolute vacuum is controlled to be less than -0.095 MPa and the temperature is 285℃. After removing trace residues, the material is extruded and granulated.

[0018] The primary reaction zone is Zone 3-4, the secondary reaction zone is Zone 5-7, and the deep vacuum devolatilization zone is Zone 8.

[0019] Furthermore, in step S1, the length-to-diameter ratio of the twin-screw extruder is 35:1-45:1.

[0020] The prepared compositions were tested according to the PV 3900 standard at 80℃ and the odor rating was 1.5 to 3; the VOC emissions were tested according to the VDA 278 standard at 90℃ for 30 minutes and the FOG emissions were 3 to 20 μg C / g; and the FOG emissions were tested according to the VDA 278 standard at 120℃ for 60 minutes and the FOG emissions were 3 to 20 μg / g.

[0021] The present invention also claims protection for the use of the composition prepared by the above preparation method in the preparation of automotive interior materials, wherein the automotive interior materials have an odor rating of 1.5 to 3 according to the PV 3900 standard and a VOC emission of 5 to 30 μg C / g according to the VDA 278 standard.

[0022] The automotive interior materials are any one of the following: dashboard, door panels, center console, seat frame, air conditioning vents, steering wheel, armrest box, or pillar trim.

[0023] In this invention, the intrinsic viscosity (IV) of the polyphenylene ether matrix resin is strictly controlled within 0.35~0.45 dL / g (chloroform, 25°C). This intrinsic viscosity range ensures that the polyphenylene ether melt possesses sufficient melt strength and mechanical properties during twin-screw extrusion, while preventing excessively high melt viscosity from causing a dramatic increase in shear heat and leading to thermal degradation or volatilization of the primary end-capping agent before the reaction.

[0024] The advantages of this invention compared to the prior art are: This invention abandons traditional physical devolatilization and small-molecule end-capping agents that generate byproducts. For the first time, it introduces a triple synergistic scheme in the modified polyphenylene ether (PPO) system: "addition of nitrogen-containing heterocyclic primary end-capping agents + steric hindrance of epoxy resins with branched aliphatic side groups + anchoring with porous inorganic adsorption media." This scheme blocks the generation of odor molecules at the source of the chemical reaction and provides molecular-level "protection" against the Mannich base structure, which easily leads to fishy odors. The composition's PV 3900 odor rating remains stable in the range of 2-2.5, and VDA 278 VOC emissions are reduced to 5-30 μg C / g, solving the air quality emission pain point of conventional modified PPO in high-end automotive interior applications.

[0025] This invention constructs a triple synergistic protection system for controlling VOCs and odors based on the mechanism of multi-level sequence end-capping and targeted synergistic effects of functional additives: First layer of protection (basic chemical end-capping): The nitrogen-containing heterocyclic primary end-capping agent undergoes a ring-opening addition reaction with the phenolic hydroxyl groups at the ends of the polyphenylene ether matrix resin chain at high temperature, forming a stable aromatic ether-amide bond structure. This process is a pure addition reaction with virtually no small molecule byproducts generated, chemically cutting off the pathway of phenolic hydroxyl groups to main chain degradation caused by thermal oxygen attack. Second layer of protection (targeted steric hindrance): The epoxy end-capping agent containing branched aliphatic side groups (such as glycidyl neodecanoate) contains highly active epoxy groups and highly branched neodecanoic acid tertiary carbon side groups containing 10 carbon atoms. Due to the presence of dibutylamine at the Mannich base end group, conventional small molecule end-capping agents have difficulty approaching it; while the highly active epoxy groups can undergo a ring-opening reaction with its residual active sites. After the reaction, the large, highly branched side groups construct a significant "umbrella-like" steric barrier structure at the polymer chain end, significantly offsetting the thermomechanical energy applied to the CN chemical bonds under high temperature and strong shear, effectively inhibiting the release of irritating dibutylamine. The third layer of protection (kinetic microporous anchoring): the pore size characteristics of the porous inorganic adsorption medium (3~10 Å zeolite molecular sieve) can well match the size of the escaped trace amounts of dibutylamine (kinetic diameter approximately 0.45~0.55 nm) and small molecule aldehydes and ketones. As the final physical barrier, it can still exert van der Waals forces to capture and anchor free odor molecules even at extremely low concentration gradients. The synergistic mechanism of this application is as follows: simple chemical end-capping (only the first layer of protection) cannot handle Mannich bases; simple physical adsorption (only the third layer of protection) will quickly reach adsorption saturation and fail in the early stages of processing due to a large amount of volatiles; simple steric hindrance reagents (only the second layer of protection) cannot prevent the degradation of the main chain phenolic hydroxyl groups. In the triple system of this invention, a nitrogen-containing heterocyclic primary end-capping agent efficiently cuts off the source of aldehyde and ketone formation through chemical end-capping, preventing the molecular sieve from failing due to overload; an epoxy end-capping agent containing branched aliphatic side groups shields the release point of dibutylamine; and finally, a porous inorganic adsorption medium is used to anchor residual trace molecules. These three components work synergistically to produce a VOC reduction effect of "1+1+1>3". Detailed Implementation

[0026] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used are all commercially available. It should be understood that the content disclosed in the following specification is only a preferred embodiment of the present invention, intended to illustrate the implementation process to those skilled in the art, but the scope of protection of the present invention is not limited thereto. Based on the teachings of the present invention, those skilled in the art may use other substitutes with similar physicochemical properties (such as branched alkyl glycidyl esters with similar molecular structures to replace neodecanoic acid glycidyl esters, or microporous adsorbent materials with pore sizes in the range of 3~10 Å to replace 5 Å zeolite molecular sieves, etc.), all of which are equivalent substitutions of the present invention and fall within the scope of protection of the claims.

[0027] In the embodiments and comparative examples of this invention, the materials involved are described below (unless otherwise specified, all are commercially available products): Polyphenylene oxide (PPO) matrix resin: Dalian Zhongmu Chemical Co., Ltd., intrinsic viscosity 0.40 dL / g.

[0028] Polystyrene resin (HIPS): Taiwan Formosa Chemicals & Fibre Corporation, brand name TAIREX HI-600.

[0029] 1,3-Benzenebisoxazolin (1,3-PBO): Toyobo Co., Ltd., Japan.

[0030] Phenylonoxazoline: BASF.

[0031] Cardura E10P (Neodecacyl glycidyl ester): Shell Chemicals.

[0032] 5Å zeolite molecular sieve: Sinopec Catalyst Co., Ltd., sodium type, particle size 1-3 μm.

[0033] Antioxidant 1010 / Antioxidant 168: BASF.

[0034] Dibutyl phthalate (solvent additive, used for comparative experiments): commercially available.

[0035] The specific testing method in the implementation plan is as follows: 1. Odor test; conducted according to Volkswagen PV 3900 standard. After baking in an 80℃ constant temperature chamber for 2 hours, five professional evaluators conducted a blind test and scored the odor (Level 1: no odor, Level 6: intolerable).

[0036] 2. VOC / FOG testing: Performed according to VDA 278 standard using thermal desorption-gas chromatography / mass spectrometry. VOC extraction conditions were 90℃ for 30 min, and FOG extraction conditions were 120℃ for 60 min.

[0037] Example 1 A method for preparing a low-odor, low-VOC modified polyphenylene ether composition involves premixing 60.0 parts of polyphenylene ether matrix resin (PPO, IV = 0.40 dL / g), 40.0 parts of polystyrene resin (HIPS), 4.0 parts of 1,3-phenylenebisoxazoline (1,3-PBO) as component A, 0.3 parts of antioxidant 1010, and 0.2 parts of antioxidant 168. The mixture is then fed into a co-rotating twin-screw extruder with an aspect ratio of 40:1 through the main feed port. The process parameters of the twin-screw extruder were set sequentially as follows: Zones 1 and 2 were set to 230~260℃ (solid conveying section); Zones 3 and 4 were set to 280~290℃; Zone 5 was set to 275℃, where 3.0 parts of Cardura E10P (component B) were injected via a liquid metering pump, and 1.5 parts of 5Å zeolite molecular sieve (component C) were added via a side feed port; Zones 6 and 7 were set to 280℃; Zone 8 was set to 285℃ (deep vacuum devolatilization zone, high vacuum system activated, vacuum level controlled at -0.096 MPa); Zone 9 (die head) was set to 285℃. The extruded material was water-cooled, stretched, and pelletized to obtain a low-odor, low-VOC modified polyphenylene ether composition; this was dried and injection molded into standard test specimens for subsequent testing. The performance test results are shown in Table 2.

[0038] Example 2 Component A, 1,3-phenylenebisoxazoline (1,3-PBO), was replaced with 4.0 parts of phenyloxazoline. All other parameters were the same as in Example 1. Performance test results are shown in Table 2.

[0039] Comparative Example 1 (Basic blank control, without component A / component B / component C) 60.0 parts of polyphenylene oxide (PPO) matrix resin, 40.0 parts of polystyrene (HIPS) resin, and an antioxidant were added to a twin-screw extruder through the main feed port. Oxazoline end-capping agents, glycidyl neodecanoate, and zeolite molecular sieves were not added to the formulation. The twin-screw extruder process parameters were the same as in Example 1, with conventional venting and extrusion granulation performed. Performance test results are shown in Table 2.

[0040] Comparative Example 2 (only chemical capping agent component A was added) The only difference from Example 1 is that glycidyl neodecanoate (component B) was not injected at Zone 5 of the twin-screw extruder, and 5 Å zeolite molecular sieve (component C) was not added. Everything else is the same as in Example 1. This comparative example aims to verify the effect of primary chemical end-capping alone. Performance test results are shown in Table 2.

[0041] Comparative Example 3 (only steric occlusion end-capping agent component B added) The only difference from Example 1 is that 1,3-PBO (component A) is not added at the main feed inlet, and 5Å zeolite molecular sieve (component C) is not added at Zone 5. This comparative example aims to verify the effectiveness of using epoxy end-capping agents alone. Performance test results are shown in Table 2.

[0042] Comparative Example 4 (only molecular sieve physical adsorbent component C added) The only difference from Example 1 is that 1,3-PBO (component A) and glycidyl neodecanoate (component B) were completely removed from the formulation. Everything else is the same as in Example 1. This comparative example aims to verify the adsorption capacity of purely physical porous materials during high-temperature extrusion. Performance test results are shown in Table 2.

[0043] Comparative Example 5 (two-component synergistic component A + component B, lacking physical anchoring component C) The only difference from Example 1 is that no 5 Å zeolite molecular sieve (component C) is added at Zone 5 of the twin-screw extruder. Everything else is the same as in Example 1. This comparative example is used to verify the effect when the final physical barrier is absent. Performance test results are shown in Table 2.

[0044] Comparative Example 6 (two-component synergistic component A + component C, missing sterically hindered component B) The only difference from Example 1 is that glycidyl neodecanoate (component B) is not injected at Zone 5 of the twin-screw extruder. Everything else is the same as in Example 1. This comparative example is used to verify whether chemical end-capping and molecular sieves alone can suppress dibutylamine emission in the absence of steric hindrance shielding. Performance test results are shown in Table 2.

[0045] Comparative Example 7 (purely physical devolatilization route, in accordance with CN102850765B) 60.0 parts of polyphenylene oxide (PPO) matrix resin, 40.0 parts of polystyrene (HIPS) resin, and an antioxidant were added as the main feedstock. 2.0 parts of a physical solvent additive (dibutyl phthalate) were added to the feed port on the Zone 5 side. Components A, B, and C were not added. High vacuum (-0.095 MPa) was set in Zone 8 for strong physical devolatilization; the rest of the twin-screw extruder settings were the same as in Example 1. The antioxidant was the same as in Example 1.

[0046] The detailed formulations of the modified polyphenylene ether compositions prepared in Examples 1-2 and Comparative Examples 1-7 are summarized in Table 1, and the test results of their odor and VOC performance are summarized in Table 2.

[0047] Table 1 Summary of Formulation Designs for Modified Polyphenylene Ether Compositions (parts by weight) Table 2 Comparison of Odor and VOC Performance Test Results of the Composition Analysis of the data in Tables 1 and 2 shows that Comparative Example 2 (with only component A) effectively cut off the burnt smell caused by the degradation of the PPO main chain, but because it could not reach and shield the Mannich base, a large amount of dibutylamine with a fishy smell was still emitted in the VDA278 test; Comparative Example 3 (with only component B) could partially shield the Mannich base end groups, but it could not effectively inhibit the large-scale thermo-oxidative degradation of the main chain at this high temperature; Comparative Example 4 (with only component C) failed the fastest, which indicates that in the absence of front-end chemical protection, the pores of the molecular sieve were quickly filled by a large amount of degradation volatiles generated instantaneously by the degradation of the polymer chain in the early stage of processing, and physical adsorption became saturated, resulting in a final VOC of up to 70 μg C / g.

[0048] Comparative Examples 5 (component A + component B) and 6 (component A + component C) still exhibited VOC levels within the bottleneck range of 25–38 μg C / g. However, when components A, B, and C were added according to the specific process temperature and sequence of this invention (as shown in Example 1), the VOC level dropped to 12 μg C / g, and the odor rating entered the 2.0 range. This confirms the mechanism of this invention: component A (basic chemical end-capping) reduces the formation of a large number of aldehyde and ketone molecules, alleviating the adsorption load on component C (molecular sieve); component B (steric hindrance) provides site-specific protection for Mannich base sites that are too small for component A molecules to reach; and finally, component C, which has not reached adsorption saturation, completes the anchoring and capture.

[0049] Based on Comparative Example 7, conventional industry practices relying on physical solvent injection or solvent volatilization (such as publication number CN102850765B) still cannot meet odor evaluation requirements when faced with odor molecules generated through continuous pyrolysis under high shear. In contrast, Example 1, through synergistic design of molecular pathways, achieves significant optimization of various emission indicators, meeting the stringent health and environmental standards for high-end automotive cabin interiors.

[0050] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims of the present invention.

Claims

1. A low-odor, low-VOC modified polyphenylene ether composition, characterized in that, By weight parts; The product comprises the following components: polyphenylene ether matrix resin, polystyrene resin, nitrogen-containing heterocyclic primary end-capping agent, epoxy secondary end-capping agent with branched aliphatic side groups, and porous inorganic adsorption medium; the total mass of polyphenylene ether matrix resin and polystyrene resin is 100-120 parts, 2-6 parts of nitrogen-containing heterocyclic primary end-capping agent, 1-5 parts of epoxy secondary end-capping agent with branched aliphatic side groups, and 0.5-3 parts of porous inorganic adsorption medium; the nitrogen-containing heterocyclic primary end-capping agent forms an aromatic ether-amide bond structure with the chain ends of the polyphenylene ether matrix resin; after the epoxy secondary end-capping agent with branched aliphatic side groups reacts with the residual active sites at the chain ends of the polyphenylene ether matrix resin, a steric hindrance shielding structure is formed at the chain ends; the mass ratio of polyphenylene ether matrix resin to polystyrene resin is 50-70: 30-50.

2. The low-odor, low-VOC modified polyphenylene ether composition as described in claim 1, characterized in that, The nitrogen-containing heterocyclic primary end-capping agent is selected from any one or more of 1,3-phenylenebisoxazoline, phenyloxazoline, polystyrene-grafted oxazoline, 2,2'-bis(2-oxazoline), or 4,4'-bis(2-oxazoline)biphenyl.

3. The low-odor, low-VOC modified polyphenylene ether composition as described in claim 1, characterized in that, The epoxy secondary capping agent containing branched aliphatic side groups is selected from any one or more of glycidyl neodecanoate, glycidyl tert-carbonate, epoxidized soybean oil, or epoxidized linseed oil.

4. The low-odor, low-VOC modified polyphenylene ether composition as described in claim 1, characterized in that, Porous inorganic adsorption media are selected from those with pore sizes of to One or more of the following: zeolite molecular sieves, mesoporous silica, or activated carbon.

5. The low-odor, low-VOC modified polyphenylene ether composition as described in claim 1, characterized in that, The composition also includes antioxidants, including hindered phenolic antioxidants and phosphite antioxidants, wherein the mass ratio of hindered phenolic antioxidants to phosphite antioxidants is 1:0.5~2, and the total mass fraction of hindered phenolic antioxidants and phosphite antioxidants is 0.1-1 parts.

6. A low-odor, low-VOC modified polyphenylene ether composition according to any one of claims 1-5, characterized in that, The preparation method adopts a multi-stage sequential reaction process using a twin-screw extruder. The temperature of the first-stage reaction zone is controlled at 280~290℃, and the temperature of the second-stage reaction zone is controlled at 275~280℃. The epoxy secondary end-capping agent containing branched aliphatic side groups and the porous inorganic adsorption medium are added in a delayed manner. The residue is removed in a deep vacuum devolatilization zone.

7. The method for preparing a low-odor, low-VOC modified polyphenylene ether composition as described in claim 6, characterized in that, Specifically, the following steps are included: S1. Add polyphenylene ether matrix resin, polystyrene resin, nitrogen-containing heterocyclic primary end-capping agent and antioxidant to the twin-screw extruder through the main feed port; S2. In the primary reaction zone of the twin-screw extruder, the temperature is controlled at 280~290℃ to allow the nitrogen-containing heterocyclic primary end-capping agent to undergo a ring-opening addition reaction with the phenolic hydroxyl groups at the chain ends of the polyphenylene ether matrix resin. S3. In the secondary reaction zone of the twin-screw extruder, the temperature is controlled at 275~280℃. An epoxy secondary end-capping agent containing branched aliphatic side groups is added in a delayed manner through a liquid metering pump, and a porous inorganic adsorption medium is added through a side feed port. The injection pressure of the liquid metering pump is 1.5~3.0 MPa, and the preheating temperature is 40~60℃. S4. In the deep vacuum devolatilization zone of the twin-screw extruder, the absolute vacuum is controlled to be less than -0.095 MPa and the temperature is 285℃. After removing the residue, the material is extruded and granulated.

8. The method for preparing a low-odor, low-VOC modified polyphenylene ether composition as described in claim 7, characterized in that, In step S1, the length-to-diameter ratio of the twin-screw extruder is 35:1-45:

1.

9. The use of the composition prepared by the method according to any one of claims 7-8 in the preparation of automotive interior materials.

10. The application as described in claim 8, characterized in that, The automotive interior materials are any one of the following: dashboard, door panels, center console, seat frame, air conditioning vents, steering wheel, armrest box, or pillar trim.

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