Conductive PPE / PA alloy material with flame-retardant effect and preparation method and application thereof

Abstract

This invention relates to the field of polymer composite material processing technology, and discloses a conductive PPE / PA alloy material with flame-retardant effect. By weight, it comprises the following components: 30-45 parts PPE resin, 28-41 parts PA resin, 5-7 parts compatibilizer PPH, 11-15 parts compatibilizer GPM, 0.2-0.6 parts lubricant LY-320, 0.2-0.6 parts lubricant C181, 0.2-0.7 parts lubricant S370, 0.2-0.6 parts composite antioxidant, 1-10 parts conductive additive, and 5-10 parts flame retardant. The conductive additive is carbon nanotubes and / or conductive carbon black; the carbon nanotubes are single-walled carbon nanotubes and / or multi-walled carbon nanotubes. The conductive PPE / PA alloy material obtained by this invention has good impact toughness, high fluidity, heat resistance, and good flame retardancy.

Description

Technical Field

[0001] This invention relates to the field of polymer composite material processing technology, specifically to a conductive PPE / PA alloy material with flame-retardant properties, its preparation method, and its applications. Background Technology

[0002] Polyphenylene oxide (PPE) is a white, non-toxic, transparent powder with a low relative density. It possesses excellent mechanical strength, stress relaxation resistance, creep resistance, heat resistance, water resistance, water vapor resistance, and dimensional stability. It also exhibits outstanding electrical insulation, good abrasion resistance, and electrical properties; furthermore, PPE has the best dielectric properties among plastics. However, its poor melt flowability, difficult processing and molding, and insensitivity to non-polar solvents significantly limit its applications.

[0003] Nylon 66 (PA66) is a transparent or opaque milky white or pale yellow granule with an apparent horny and hard surface. It has high mechanical strength, a high softening point, good heat resistance, a low coefficient of friction, wear resistance, self-lubrication, shock absorption, and sound insulation. It is also resistant to oil, weak acids, weak alkalis, and common solvents. It has good electrical insulation, is self-extinguishing, non-toxic, and odorless. Moreover, it maintains strong strength and rigidity even at high temperatures, especially with good heat and alkali resistance. However, due to the presence of amide groups in its structure, which are polar groups, nylon will undergo thermal degradation, hydrolysis, and photodegradation in high-temperature, humid, or ultraviolet-irradiated environments. This affects the dimensional stability and mechanical properties of its products, reducing product stability and service life, which limits the application of nylon.

[0004] However, PPE is an amorphous polymer, while PA66 is a semi-crystalline polymer. Simple blends of these two incompatible polymers exhibit poor interfacial adhesion and lack morphological stability. Furthermore, the difference in melt viscosity between PPE and PA66 leads to stress cracking in these alloys, making it difficult to achieve satisfactory impact, tensile, and flexural properties, thus significantly limiting the application of PPE and PA66 blends. Therefore, the development of alloy materials must utilize compatibilizers for compatibilization, employ specialized preparation processes to mitigate the shortcomings of both PPE and PA66, and combine their advantages to create high-performance alloy materials.

[0005] Polyphenylene oxide / polyamide (PPE / PA) is a plastic alloy with excellent comprehensive properties. It combines the advantages of both PPE and PA: it has the heat resistance, dimensional stability, and acid and alkali resistance of PPE, while compared with pure PPE, PPE / PA alloy has lower melt viscosity and is relatively easier to process, and it also has the solvent resistance and excellent mechanical properties of PA.

[0006] However, PPE / PA has poor electrical conductivity. To broaden its application in automotive and other engineering fields, it often needs to be electrostatically sprayable. Better flame retardant properties would also significantly improve safety and expand its application scenarios. The addition of flame retardant XS-FR-308 greatly improves the dispersion performance of its conductive carbon black. Due to the presence of PA in the PPE / PA alloy, its dimensional stability is worse than that of pure PPE. In some applications with high dimensional accuracy requirements (commonly found in automotive parts), the dimensional stability of PPE / PA alloy still needs further improvement. For example, Chinese patent CN109370211B discloses a PA / PPO alloy comprising the following components: PPO resin, nylon (PA), toughening agent, compatibilizer, conductive carbon black, expanded graphite, and other additives. This alloy has high antistatic properties and electrical uniformity, but its dimensional stability is relatively poor, and its conductivity needs further improvement. Summary of the Invention

[0007] The purpose of this invention is to address the above-mentioned technical problems by proposing a conductive PPE / PA alloy material with flame-retardant properties, its preparation method, and its application.

[0008] The technical solution adopted is as follows:

[0009] The first aspect of the present invention provides a conductive PPE / PA alloy material with flame-retardant properties, comprising the following components in parts by weight:

[0010] 30-45 parts PPE resin, 28-41 parts PA resin, 5-7 parts PPH compatibilizer, 11-15 parts GPM compatibilizer, 0.2-0.6 parts LY-320 lubricant, 0.2-0.6 parts C181 lubricant, 0.2-0.7 parts S370 lubricant, 0.2-0.6 parts composite antioxidant, 1-10 parts conductive additive, and 5-10 parts flame retardant;

[0011] The conductive additive is carbon nanotubes and / or conductive carbon black; the carbon nanotubes are single-walled carbon nanotubes and / or multi-walled carbon nanotubes.

[0012] Preferably, the PPE resin is produced by Nantong Xingchen Synthetic Materials Co., Ltd., and has a molecular weight of 10,000 to 50,000.

[0013] More preferably, the PA resin is produced by Pingdingshan Shenma Engineering Plastics Co., Ltd., and has a molecular weight of 10,000 to 50,000.

[0014] According to a particularly preferred embodiment, the compatibilizer PPH is prepared as follows: 80 parts of PPE, 20 parts of polystyrene, 3 parts of glycidyl methacrylate, 2 parts of maleic anhydride, 0.3 parts of di-tert-butyl peroxide isopropylbenzene, and 0.2 parts of benzoin are weighed according to mass fraction and placed in a high-speed mixer for 5 minutes. The mixture is then discharged. The mixture is then blended and granulated using a twin-screw extruder to obtain polyphenylene ether grafted with maleic anhydride. The twin-screw extrusion processing temperature is 240–260°C, and the screw speed is 38–42 Hz.

[0015] Preferably, the conductive additive is carbon nanotubes and conductive carbon black in a weight ratio of 1:1.0 to 4.0.

[0016] In a preferred embodiment, the carbon nanotubes are multi-walled carbon nanotubes.

[0017] More preferably, the compatibilizer GPM is SEBS grafted maleic anhydride, and the compatibilizer GPM is GPM5618 produced by Ningbo Nengzhiguang New Material Technology Co., Ltd.

[0018] Preferably, the composite antioxidant is tris[2,4-di-tert-butylphenyl]pentaerythritol ester and N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine in a content ratio of 1:1.

[0019] Preferably, the flame retardant is produced by Ningbo Huiwangcheng Plastics Co., Ltd.

[0020] The second aspect of the present invention provides a method for preparing a conductive PPE / PA alloy material with flame retardant effect as described in the first aspect of the present invention. The raw materials are weighed according to the weight ratio, and mixed evenly in a high-speed mixer. The mixture is then co-extruded by a twin-screw extruder, cooled, pelletized, and dried.

[0021] The mixing conditions must at least meet the following requirements: stirring speed of 300 rpm and time of 2 to 5 minutes;

[0022] The parameters of the twin-screw extruder should at least meet the following requirements: temperature of 240–260°C and main extruder speed of 46–50 Hz.

[0023] The third aspect of the present invention provides the application of the flame-retardant conductive PPE / PA alloy material described in the first aspect of the present invention in automobiles.

[0024] The beneficial effects of this invention are:

[0025] (1) This invention selects PPE resin and PA resin in specific proportions as matrix materials (of which PPE resin is the main matrix material), and selects polyphenylene ether grafted maleic anhydride and SEBS grafted maleic anhydride in specific amounts as composite compatibilizers. The polyphenylene ether grafted maleic anhydride is thermodynamically compatible with PPE resin, and PA resin is compatible with block copolymers, enabling PPE resin and PA resin to have good compatibility and improving the compatibility between the components in this invention. The PPE resin is grade LXN040, which has good flow properties and is beneficial for dispersing conductive media; the PA resin is grade EPR24, which has low viscosity, high strength, and good flow properties, and is beneficial for dispersing conductive media.

[0026] (2) The present invention selects a specific amount of polyolefin elastomer as toughening agent and adds a specific amount of high temperature composite antioxidant. Under the action of block copolymer as composite compatibilizer and in combination with the other technical features of the present invention, the PPE / PA alloy material obtained has excellent impact toughness, fluidity and long aging resistance. It also has excellent rigidity, toughness, heat resistance and flame retardancy. Furthermore, due to its excellent flame retardancy, its safety is greatly improved and it can be more widely used in more fields.

[0027] (3) By using a special ratio of carbon nanotubes and conductive carbon black, the conductivity of PPE / PA alloy can be improved and the conductivity loss rate at high temperature can be reduced. Furthermore, the grade of the carbon nanotubes is GC-30, a wet granulation product of multi-walled carbon nanotubes in an agglomerated and entangled state. It can achieve the same or even better effect by adding less parts, and has excellent performance and considerable cost advantages.

[0028] (4) In this invention, flame retardant XS-FR-308 is added. Flame retardant XS-FR-308 is a nitrogen-phosphorus composite, low-smoke expansion type flame retardant. Through the synergistic effect of nitrogen and phosphorus elements, it provides a high-efficiency flame retardant effect. It does not contain toxic or harmful substances. It not only improves the dispersion of conductive carbon black, but also improves the flame retardancy of the material, thus greatly improving safety. Detailed Implementation

[0029] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0030] In this invention, SEBS is a linear triblock copolymer with polystyrene as the end segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block.

[0031] It should be noted that, in all aspects of the present invention, the same components in each aspect are described only once in one aspect and not repeatedly, and those skilled in the art should not understand this as a limitation of the present invention.

[0032] The present invention will be described in detail below through examples. In the following examples, unless otherwise specified, the raw materials are all commercially available products.

[0033] In the following examples, the PPE resin, with an intrinsic viscosity of 0.3-0.6 dl / g and a molecular weight of 10,000 to 50,000, was purchased from Nantong Xingchen Synthetic Materials Co., Ltd., and its grade was LXN040.

[0034] PA resin with a molecular weight of 10,000 to 50,000 was purchased from Pingdingshan Shenma Engineering Plastics Co., Ltd., and its grade was EPR24.

[0035] The compatibilizer GPM is SEBS grafted maleic anhydride, purchased from Ningbo Nengzhiguang New Material Technology Co., Ltd., with the grade GPM5618.

[0036] Tris[2,4-di-tert-butylphenyl]pentaerythritol ester, purchased from Beijing Jiyi Holdings Group Co., Ltd., brand name Antioxidant 168;

[0037] N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, purchased from Chenghe Technology Co., Ltd., brand name Antioxidant 1098;

[0038] Lubricant LY-320, purchased from Suzhou Afanti New Materials Co., Ltd.;

[0039] Lubricant C181 was purchased from Wuhan Hyperbranched Resin Technology Co., Ltd.

[0040] Lubricant S370 was purchased from Shanghai Songna New Materials Co., Ltd.

[0041] Flame retardant XS-FR-308 was purchased from Ningbo Huiwangcheng Plastics Co., Ltd.

[0042] The conductive additives were carbon nanotubes and conductive carbon black in a 1:4 ratio. The carbon nanotubes were purchased from Shandong Dazhan Nanomaterials Co., Ltd., with the grade GC-30; the conductive carbon black was purchased from Cabot (China) Investment Co., Ltd., with the grade Cabot-22.

[0043] Example 1

[0044] A conductive PPE / PA alloy material with flame-retardant properties, comprising the following components by weight:

[0045] 30 parts PPE resin, 40.5 parts PA resin, 6 parts PPH compatibilizer, 11.5 parts GPM compatibilizer, 0.3 parts LY-320 lubricant, 0.3 parts C181 lubricant, 0.3 parts S370 lubricant, 0.4 parts composite antioxidant, 5 parts conductive additive, and 6 parts flame retardant XS-FR-308.

[0046] The composite antioxidant is tris[2,4-di-tert-butylphenyl]pentaerythritol ester and N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine in a content ratio of 1:1, wherein, by weight, the tris[2,4-di-tert-butylphenyl]pentaerythritol ester is 0.2 parts.

[0047] The compatibilizer PPH is prepared as follows: 80 parts of PPE, 20 parts of polystyrene, 3 parts of glycidyl methacrylate, 2 parts of maleic anhydride, 0.3 parts of di-tert-butyl peroxide isopropylbenzene, and 0.2 parts of benzoin are weighed according to mass fraction, and mixed in a high-speed mixer for 5 minutes. The mixture is then discharged. The compatibilizer PPH (polyphenylene ether grafted with maleic anhydride) is obtained by blending and granulation using a twin-screw extruder. The twin-screw extrusion processing temperature is 240-260℃, and the screw speed is 38-42Hz.

[0048] The preparation method of conductive PPE / PA alloy material with flame-retardant effect is as follows (according to the formula and process parameters in Table 1):

[0049] Weigh the raw materials according to the specified weight ratio, add all raw materials except PA resin to a high-speed mixer and mix thoroughly. Add PA resin by side feeding, then co-extrude through a twin-screw extruder, cool, pelletize and dry.

[0050] Example 2

[0051] A conductive PPE / PA alloy material with flame-retardant properties, comprising the following components by weight:

[0052] 38 parts PPE resin, 32.5 parts PA resin, 6 parts PPH compatibilizer, 11.5 parts GPM compatibilizer, 0.3 parts LY-320 lubricant, 0.3 parts C181 lubricant, 0.3 parts S370 lubricant, 0.4 parts composite antioxidant, 5 parts conductive additive, and 6 parts flame retardant XS-FR-308.

[0053] The composite antioxidant is tris[2,4-di-tert-butylphenyl]pentaerythritol ester and N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine in a content ratio of 1:1, wherein, by weight, the tris[2,4-di-tert-butylphenyl]pentaerythritol ester is 0.2 parts.

[0054] The compatibilizer PPH is prepared as follows: Weigh 80 parts of PPE, 20 parts of polystyrene, 3 parts of glycidyl methacrylate, 2 parts of maleic anhydride, 0.3 parts of di-tert-butyl peroxide, and 0.2 parts of benzoin according to the mass fraction, put them into a high-speed mixer and mix for 5 minutes, then discharge the material; use a twin-screw extruder to blend and granulate to obtain compatibilizer PPH (polyphenylene ether grafted maleic anhydride); the twin-screw extrusion processing temperature is 240-260℃, and the screw speed is 38-42Hz.

[0055] The preparation method of conductive PPE / PA alloy material with flame-retardant effect is as follows (according to the formula and process parameters in Table 1):

[0056] Weigh the raw materials according to the specified weight ratio, add all raw materials except PA resin to a high-speed mixer and mix thoroughly. Add PA resin by side feeding, then co-extrude through a twin-screw extruder, cool, pelletize and dry.

[0057] Example 3

[0058] A conductive PPE / PA alloy material with flame-retardant properties, comprising the following components by weight:

[0059] 42 parts PPE resin, 28.5 parts PA resin, 6 parts PPH compatibilizer, 11.5 parts GPM compatibilizer, 0.3 parts LY-320 lubricant, 0.3 parts C181 lubricant, 0.3 parts S370 lubricant, 0.4 parts composite antioxidant, 5 parts conductive additive, and 6 parts flame retardant XS-FR-308.

[0060] The composite antioxidant is tris[2,4-di-tert-butylphenyl]pentaerythritol ester and N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine in a content ratio of 1:1, wherein, by weight, the tris[2,4-di-tert-butylphenyl]pentaerythritol ester is 0.2 parts.

[0061] The compatibilizer PPH is prepared as follows: Weigh 80 parts of PPE, 20 parts of polystyrene, 3 parts of glycidyl methacrylate, 2 parts of maleic anhydride, 0.3 parts of di-tert-butyl peroxide isopropylbenzene, and 0.2 parts of benzoin according to the mass fraction, put them into a high-speed mixer and mix for 5 minutes, then discharge the material; use a twin-screw extruder to perform blending and granulation to obtain compatibilizer PPH (polyphenylene ether grafted maleic anhydride); the twin-screw extrusion processing temperature is 240-260℃, and the screw speed is 38-42Hz.

[0062] The preparation method of conductive PPE / PA alloy material with flame-retardant effect is as follows (according to the formula and process parameters in Table 1):

[0063] Weigh the raw materials according to the specified weight ratio, add all raw materials except PA resin to a high-speed mixer and mix thoroughly. Add PA resin by side feeding, then co-extrude through a twin-screw extruder, cool, pelletize and dry.

[0064] Example 4

[0065] A conductive PPE / PA alloy material with flame-retardant properties, comprising the following components by weight:

[0066] 34 parts PPE resin, 34 parts PA resin, 5 parts PPH compatibilizer, 12 parts GPM compatibilizer, 0.2 parts LY-320 lubricant, 0.2 parts C181 lubricant, 0.2 parts S370 lubricant, 0.4 parts composite antioxidant, 8 parts conductive additive, and 6 parts flame retardant XS-FR-308.

[0067] The composite antioxidant is tris[2,4-di-tert-butylphenyl]pentaerythritol ester and N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine in a content ratio of 1:1, wherein, by weight, the tris[2,4-di-tert-butylphenyl]pentaerythritol ester is 0.2 parts.

[0068] The compatibilizer PPH is prepared as follows: Weigh 80 parts of PPE, 20 parts of polystyrene, 3 parts of glycidyl methacrylate, 2 parts of maleic anhydride, 0.3 parts of di-tert-butyl peroxide isopropylbenzene, and 0.2 parts of benzoin according to the mass fraction, put them into a high-speed mixer and mix for 5 minutes, then discharge the material; use a twin-screw extruder to perform blending and granulation to obtain compatibilizer PPH (polyphenylene ether grafted maleic anhydride); the twin-screw extrusion processing temperature is 240-260℃, and the screw speed is 38-42Hz.

[0069] The preparation method of conductive PPE / PA alloy material with flame-retardant effect is as follows (according to the formula and process parameters in Table 1):

[0070] Weigh the raw materials according to the specified weight ratio, add all raw materials except PA resin to a high-speed mixer and mix thoroughly. Add PA resin by side feeding, then co-extrude through a twin-screw extruder, cool, pelletize and dry.

[0071] Table 1

[0072]

[0073]

[0074] Comparative Example 1

[0075] A conductive PPE / PA alloy material with flame-retardant properties, comprising the following components by weight:

[0076] 20 parts PPE resin, 40.5 parts PA resin, 6 parts PPH compatibilizer, 11.5 parts GPM compatibilizer, 0.3 parts LY-320 lubricant, 0.3 parts C181 lubricant, 0.3 parts S370 lubricant, 0.4 parts composite antioxidant, 5 parts conductive additive, and 6 parts flame retardant XS-FR-308.

[0077] The composite antioxidant is tris[2,4-di-tert-butylphenyl]pentaerythritol ester and N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine in a content ratio of 1:1, wherein, by weight, the tris[2,4-di-tert-butylphenyl]pentaerythritol ester is 0.2 parts.

[0078] The compatibilizer PPH is prepared as follows: Weigh 80 parts of PPE, 20 parts of polystyrene, 3 parts of glycidyl methacrylate, 2 parts of maleic anhydride, 0.3 parts of di-tert-butyl peroxide, and 0.2 parts of benzoin according to the mass fraction, put them into a high-speed mixer and mix for 5 minutes, then discharge the material; use a twin-screw extruder to blend and granulate to obtain compatibilizer PPH (polyphenylene ether grafted maleic anhydride); the twin-screw extrusion processing temperature is 240-260℃, and the screw speed is 38-42Hz.

[0079] The preparation method of conductive PPE / PA alloy material with flame-retardant effect is as follows (according to the formula and process parameters in Table 1):

[0080] Weigh the raw materials according to the specified weight ratio, add all raw materials except PA resin to a high-speed mixer and mix thoroughly. Add PA resin by side feeding, then co-extrude through a twin-screw extruder, cool, pelletize and dry.

[0081] Comparative Example 2

[0082] The procedure was carried out according to the method of Example 1, except that the amount of PA resin used was 50 parts, and the other parameters and methods were the same as in Example 1.

[0083] Comparative Example 3

[0084] The procedure was carried out according to the method of Example 1, except that the conductive additive was carbon nanotubes and conductive carbon black in a weight ratio of 1:5, and the other parameters and methods were the same as in Example 1.

[0085] Comparative Example 4

[0086] The procedure was carried out according to the method of Example 1, except that carbon nanotubes of grade GC-22 and conductive carbon black of grade XC-72 were used instead, while the other parameters and methods were the same as in Example 1.

[0087] Comparative Example 5

[0088] The procedure was carried out according to Example 1, except that flame retardant OP-1230 was used instead of flame retardant XS-FR-308, and the other parameters and methods were the same as in Example 1.

[0089] Test Example 1

[0090] The high-toughness PPE / PPS alloy materials obtained in the above examples and comparative examples were placed in a vacuum oven and dried at 120°C for 2 hours. They were then transferred to an injection molding machine and injection molded at 265-280°C to obtain sample strips. The samples were then placed in an environment with a temperature of 23±2°C and a relative humidity of 50±10% for 48 hours before performance testing was conducted.

[0091] Melt flow index was tested in accordance with ISO 1133 standard.

[0092] Tensile strength was tested according to the ASTM D638 standard.

[0093] Bending strength was tested according to ASTM D790 standard.

[0094] Notched impact strength was tested according to ASTM D256 standard.

[0095] The heat distortion temperature was tested in accordance with the ASTM D648 standard.

[0096] Flame retardancy is tested in accordance with UL-94-1985 standard.

[0097] The test results are shown in Table 2.

[0098] Table 2

[0099]

[0100]

[0101] As can be seen from the results in Table 2, by adopting the technical solution of the present invention, combined with other technical features such as the specific process of the twin-screw extruder, the compatibility problem of raw materials is well solved. The conductive PPE / PA alloy material with flame retardant effect obtained by the embodiments of the present invention has significantly better impact toughness, high fluidity, heat resistance, and good flame retardancy.

[0102] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A conductive PPE / PA alloy material having a flame retardant effect, characterized by, By weight, it comprises the following components: 30-45 parts PPE resin, 28-41 parts PA resin, 5-7 parts PPH compatibilizer, 11-15 parts GPM compatibilizer, 0.2-0.6 parts LY-320 lubricant, 0.2-0.6 parts C181 lubricant, 0.2-0.7 parts S370 lubricant, 0.2-0.6 parts composite antioxidant, 1-10 parts conductive additive, and 5-10 parts flame retardant; The conductive additive is carbon nanotube GC-30 and conductive carbon black Cabot-22 with a weight ratio of 1:1~4; The compatibilizer GPM is SEBS grafted maleic anhydride, and the compatibilizer GPM is GPM5618 produced by Ningbo Nengzhiguang New Material Technology Co., Ltd. The flame retardant is flame retardant XS-FR-308; The compatibilizer PPH is prepared as follows: Weigh 80 parts of PPE, 20 parts of polystyrene, 3 parts of glycidyl methacrylate, 2 parts of maleic anhydride, 0.3 parts of di-tert-butyl peroxide isopropylbenzene, and 0.2 parts of benzoin according to the mass fraction, put them into a high-speed mixer and mix for 5 minutes, then discharge the material; use a twin-screw extruder to perform blending and granulation to obtain polyphenylene ether grafted with maleic anhydride; the twin-screw extrusion processing temperature is 240~260℃, and the screw speed is 38~42Hz.

2. The electrically conductive PPE / PA alloy material with flame retardation effect according to claim 1, wherein, The PPE resin is produced by Nantong Xingchen Synthetic Materials Co., Ltd., and has a molecular weight of 10,000 to 50,000. And / or, the PA resin is produced by Pingdingshan Shenma Engineering Plastics Co., Ltd., with a molecular weight of 10,000 to 50,000.

3. The conductive PPE / PA alloy material with flame-retardant effect according to claim 1 or 2, wherein, The composite antioxidant is tris[2,4-di-tert-butylphenyl]pentaerythritol ester and N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine in a content ratio of 1:

1.

4. A method for preparing a conductive PPE / PA alloy material with flame-retardant effect as described in any one of claims 1-3, characterized in that, Weigh the raw materials according to the specified weight ratio, put them into a high-speed mixer and mix them evenly. Then, extrude them through a twin-screw extruder, cool, pelletize, and dry them. The mixing conditions must at least meet the following requirements: stirring speed of 300 rpm and time of 2-5 min; The parameters of the twin-screw extruder should at least meet the following requirements: temperature 240~260℃, main extruder speed 46~50Hz.

5. The application of the flame-retardant conductive PPE / PA alloy material as described in any one of claims 1-3 in automobiles.

Images