A turbocharger pipe and a manufacturing process thereof

Abstract

The application relates to the field of turbocharging pipe preparation, in particular to a turbocharging pipe and a preparation process thereof, the turbocharging pipe comprising an inner layer and an outer layer, the inner layer and / or the outer layer comprising an EPDM rubber layer and an AEM rubber layer; the AEM rubber layer comprises, in terms of weight fractions, 100 parts of ethylene propylene acrylate rubber, 30-50 parts of carbon black, 5-15 parts of a plasticizer, 0.1-2 parts of a flow aid, 1-3 parts of an antioxidant, 0.1-3 parts of an accelerator and 0.1-2 parts of a vulcanizing agent; the EPDM rubber layer comprises, in terms of weight fractions, 100 parts of a ternary ethylene propylene rubber, 60-100 parts of carbon black, 20-60 parts of a plasticizer, 0.1-2 parts of a flow aid, 0.1-2 parts of an antioxidant, 1-3 parts of an accelerator and 3-6 parts of a vulcanizing agent. The preparation process of the turbocharging pipe comprises rubber mixing, extrusion, weaving of a reinforcing layer and vulcanization. The application has the advantages of reducing the production cost of the turbocharging pipe in a hybrid electric vehicle.

Description

Technical Field

[0001] This application relates to the field of turbocharger tube fabrication, and more specifically, to turbocharger tubes and their fabrication processes. Background Technology

[0002] With the continuous rise in oil prices in recent years, environmentally friendly vehicles have received more attention. Hybrid electric vehicles combine the advantages of internal combustion engines and electric vehicles, significantly reducing emissions and saving energy consumption, making them more suitable for China's actual conditions. In hybrid electric vehicles, the powertrain can flexibly adjust the engine according to the actual operating conditions of the vehicle, ensuring that the engine always operates within its optimal performance range, thereby reducing the temperature of the gas entering the turbocharger through the turbocharger manifold.

[0003] Ethylene acrylate rubber (hereinafter referred to as AEM) is an elastomer obtained by copolymerization of ethylene acrylate as the main monomer. Because the main chain of AEM is a saturated carbon chain and the side groups are polar ester groups, AEM has advantages such as heat resistance, aging resistance, and oil resistance. At present, AEM is widely used in various high-temperature and oil-resistant environments, especially in the preparation of turbocharger pipes for gasoline vehicles.

[0004] However, due to the high unit price of AEM (Automatic Power Supply) and its long-term dependence on foreign suppliers, there is an urgent need for a low-cost turbocharger pipe for hybrid vehicles. This has resulted in high production costs for turbocharger pipes used in hybrid vehicles. Summary of the Invention

[0005] In order to reduce the production cost of turbocharger pipes in hybrid vehicles, this application provides a turbocharger pipe and its manufacturing process, which saves AEM material and thus reduces the production cost of turbocharger pipes.

[0006] This application provides a turbocharger pipe and its manufacturing process, which adopts the following technical solution:

[0007] In a first aspect, this application provides a turbocharger pipe and its manufacturing process, employing the following technical solution:

[0008] A turbocharger pipe and its manufacturing process, comprising an inner layer and an outer layer, wherein the inner layer and / or the outer layer are composed of an EPDM rubber layer and an AEM rubber layer;

[0009] The AEM rubber layer comprises, by weight, 100 parts ethylene acrylate rubber, 30-50 parts carbon black, 5-15 parts plasticizer, 0.1-2 parts flow aid, 1-3 parts antioxidant, 0.1-3 parts accelerator, and 0.1-2 parts vulcanizing agent;

[0010] The EPDM rubber layer comprises, by weight, 100 parts of EPDM rubber, 60-100 parts of carbon black, 20-60 parts of plasticizer, 0.1-2 parts of flow aid, 0.1-2 parts of antioxidant, 1-3 parts of accelerator, and 3-6 parts of vulcanizing agent.

[0011] By adopting the above technical solution, turbocharger pipes in gasoline vehicles are typically made of AEM rubber. AEM rubber is mostly imported, resulting in a high unit price and consequently high manufacturing costs for turbocharger pipes. Since the air temperature passing through the turbocharger pipe in hybrid vehicles is lower, and EPDM rubber has excellent heat resistance, EPDM rubber can be used to replace some of the AEM rubber, thereby reducing the production cost of turbocharger pipes in hybrid vehicles.

[0012] The air passing through the turbocharger pipe is generally mixed with oil and gas. AEM rubber has excellent oil and heat resistance. Therefore, the AEM rubber layer is placed in the innermost and outermost layers, so that the rubber that comes into direct contact with the oil and gas mixture is an oil-resistant AEM rubber layer.

[0013] In this application, the AEM rubber layer and the EPDM rubber layer adopt an improved formulation system, which makes the two form a peroxide system, thereby making the polarity of the AEM rubber layer and the EPDM rubber layer similar, improving the compatibility of the AEM rubber layer and the EPDM rubber layer, effectively improving the bonding strength between the AEM rubber layer and the EPDM rubber layer, and minimizing the phenomenon of layer-to-layer delamination in the turbocharger pipe under the long-term vibration environment during vehicle operation.

[0014] Preferably, the ethylene acrylate rubber is VMX2122-AEM.

[0015] By adopting the above technical solution, VMX2122-AEM is a peroxide system, which is more suitable for EPDM rubber layer. In addition, VMX2122-AEM has a high viscosity, which can improve the bonding strength between AEM rubber layer and EPDM rubber layer and reduce the probability of turbocharger pipe peeling.

[0016] Preferably, the flow aid for the AEM rubber layer is vinyl acetate.

[0017] By adopting the above technical solution, vinyl acetate can reduce the viscosity of the rubber compound and improve its flowability, thereby making the viscosity and flowability of AEM rubber and EPDM rubber similar, improving their compatibility, making the AEM rubber layer and EPDM rubber layer easier to bond, and making the AEM rubber layer and EPDM rubber layer difficult to peel off.

[0018] Preferably, the carbon black in the EPDM layer is one or both of N550 and N774.

[0019] By adopting the above technical solutions, N550 carbon black is easily dispersed, imparting high stiffness to the rubber compound. Rubber compounds with added N550 carbon black exhibit better high-temperature resistance and thermal conductivity, and also show faster extrusion speeds and smoother extruded surfaces. However, the processing performance of N550 carbon black is relatively poor. Rubber compounds using N774 carbon black show better processing performance, high elasticity, low heat generation, and good dynamic properties. Through the combined effect of N774 and N550 carbon black, the physical and processing properties of EPDM rubber can be effectively improved.

[0020] Preferably, the antioxidant for the AEM rubber layer is 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine.

[0021] By adopting the above technical solution, 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine and 2-mercaptobenzimidazole are respectively antioxidants VAM. Antioxidant VAM can protect rubber from aging caused by fluorescence and high heat, and provide good anti-aging performance for the AEM rubber layer set on the outer layer.

[0022] Preferably, it also includes a reinforcing layer, which is made of aramid yarn with a tensile strength ≥200N / thread, a twist of 75-125TPM, and a density of 1100≤2000dtex.

[0023] By adopting the above technical solution, the reinforcement layer ensures that the turbocharger tube has a certain burst pressure, minimizing the possibility of bursting during use, ensuring the safety of the turbocharger tube, and extending its service life. The aramid yarn, made of aramid 1414 with limited twisting, possesses extremely high strength and features high temperature resistance, fire retardancy, and light weight. Using aramid yarn to create the reinforcement layer gives it high temperature resistance, fire retardancy, high strength, and good mechanical properties, thereby enhancing the strength and other mechanical properties of the turbine tube.

[0024] Secondly, this application provides a method for manufacturing a turbocharger pipe, which adopts the following technical solution:

[0025] A method for preparing a turbocharger pipe includes the following steps: mixing ethylene acrylate rubber with an antioxidant and ethylene propylene diene monomer (EPDM) rubber with an antioxidant in parts by weight, then adding carbon black, plasticizer, flow aid, accelerator and vulcanizing agent in parts by weight and continuing mixing; extruding and vulcanizing the AEM rubber and EPDM rubber obtained above to obtain a turbocharger pipe.

[0026] By adopting the above technical solution and following the above steps, the turbocharger pipe prepared replaces part of the AEM rubber layer with an EPDM rubber layer, thereby saving the amount of AEM rubber and reducing the production cost of the turbocharger pipe in hybrid vehicles.

[0027] In this process, ethylene acrylate rubber and ethylene propylene diene monomer (EPDM) rubber are first mixed with antioxidants, allowing the antioxidants to react chemically with the ethylene acrylate rubber and EPDM rubber and bond to the rubber molecular chains through chemical bonds. This ensures that the antioxidants are firmly bonded to the ethylene acrylate rubber and EPDM rubber and are not easily volatilized.

[0028] Adding carbon black and plasticizers to the compound enhances the strength and elasticity of ethylene acrylate rubber and EPDM rubber, giving the turbocharger pipe excellent mechanical properties. Finally, flow aids, accelerators, and vulcanizing agents are added to improve the mechanical properties of the rubber. At the same time, adding accelerators and vulcanizing agents separately from antioxidants reduces the delaying or even hindering effect of antioxidants on the vulcanization of vulcanizing agents.

[0029] Preferably, the mixing temperature of the AEM rubber layer in S1.1 is 120-140℃, and the extrusion temperature is 60-80℃.

[0030] By adopting the above technical solution, this application prepares ethylene acrylate rubber compound according to the above process parameters, which helps to improve the flowability and viscosity of ethylene acrylate rubber compound, making it easier for ethylene acrylate rubber and EPDM rubber to bond, improving the bonding strength of AEM rubber layer and EPDM rubber layer, thereby improving the stability of turbocharger pipe.

[0031] Preferably, the mixing temperature of the EPDM rubber layer in S1.2 is 130-150℃, and the extrusion temperature is 70-90℃.

[0032] By adopting the above technical solution, this application prepares EPDM rubber compound according to the above process parameters, which helps the EPDM rubber compound to vulcanize more thoroughly, thereby giving the EPDM rubber compound excellent mechanical properties and heat resistance.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. By replacing part of the AEM rubber layer with an EPDM rubber layer, the amount of AEM rubber used is saved, thereby reducing the production cost of turbocharger pipes in hybrid vehicles;

[0035] 2. The reinforcement layer ensures that the turbocharger pipe has a certain burst pressure, minimizing the possibility of bursting during use, ensuring the safety of the turbocharger pipe, and extending its service life. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the embodiments.

[0037] All raw materials involved in this application are commercially available, and the models of each component are shown in Table 1.

[0038] Table 1 Specifications / Models of Each Component

[0039] raw material Specifications / Model raw material Specifications / Model ethylene acrylate VMX2122-AEM EPDM rubber PX-008M ethylene acrylate HT-AEM Aramid yarn 2000D carbon black N550 carbon black N774 plasticizer TOTM plasticizer TU16 paraffin oil Flow aids VAM Flow aids PEG400 Anti-aging agents 445 Anti-aging agents MB Accelerator TAIC vulcanizing agent BIPB

[0040] Example

[0041] Example 1

[0042] The turbocharger pipe provided in Example 1 includes an inner layer, a reinforcing layer, and an outer layer. The inner layer consists of an AEM rubber layer and an EPDM rubber layer, and the outer layer consists of an EPDM rubber layer and an AEM rubber layer. The raw material composition of the AEM rubber layer and the EPDM rubber layer of the turbocharger pipe provided in Example 1 is as follows:

[0043] The AEM rubber layer comprises the following components by weight: 100 kg ethylene acrylate, 40 kg N550 carbon black, 10 kg plasticizer, 2 kg flow aid, 2 kg antioxidant, 3 kg accelerator, and 2 kg vulcanizing agent. The ethylene acrylate used is VMX2122-AEM, the plasticizer is TOTM, the flow aid is VAM, the antioxidant is 445, the accelerator is TAIC, and the vulcanizing agent is BIPB.

[0044] The EPDM rubber layer comprises the following components by weight: 100 kg EPDM rubber, 50 kg N550 carbon black, 30 kg N774 carbon black, 40 kg plasticizer, 2 kg flow aid, 2 kg antioxidant, 3 kg accelerator, and 6 kg vulcanizing agent. The plasticizer is TU16 paraffin oil, the flow aid is PEG400, the antioxidant is MB, the accelerator is TAIC, and the vulcanizing agent is BIPB.

[0045] The above-mentioned method for preparing the turbocharger pipe includes the following steps:

[0046] S1AEM rubber layer, EPDM rubber layer rubber compounding

[0047] S1.1 Preparation of AEM rubber layer compound: Add VMX2122-AEM and antioxidant 445 to the internal mixer and mix for 30s; then add N550 carbon black and plasticizer TOTM and mix for 80s; finally add flow aid VAM, accelerator TAIC and vulcanizing agent BIPB and continue mixing for 140s.

[0048] S1.2 Preparation of EPDM rubber layer compound: PX-008M and antioxidant MB are added to a mixer and mixed under pressure for 50s; then N774 carbon black, N550 carbon black and TU16 paraffin oil are added and mixed for 80s; finally, flow aid PEG400, accelerator TAIC and vulcanizing agent BIPB are added and mixed for another 140s.

[0049] S2, Extruded AEM rubber layer, EPDM rubber layer

[0050] The mandrel is pulled by a traction machine through an AEM rubber extruder and an EPDM rubber extruder in sequence, so that the EPDM rubber layer and the AEM rubber layer are extruded and coated on the surface of the mandrel in sequence, thus initially obtaining a wire roller;

[0051] S3, Braided Reinforcement Layer

[0052] The yarn roller obtained from S2 is placed on the pay-off frame of the reinforcing layer braiding machine. The braiding machine braids the rubber tube semi-finished product and automatically winds it onto another yarn roller after the braiding is completed. The raw material of the reinforcing layer is 2000D aramid yarn.

[0053] S4, extruded EPDM rubber layer, AEM rubber layer

[0054] The wire roller obtained in S3 is pulled by a traction machine through an EPDM rubber extruder and an AEM rubber extruder in sequence, so that the EPDM rubber layer and the AEM rubber layer are extruded and coated on the surface of the wire roller obtained in S3 in sequence, and then coiled on a vulcanizing disc by a traction device.

[0055] S5 vulcanization

[0056] Cut the vulcanizing disc according to requirements and blow out the mandrel with an air gun. Place the resulting tube blank on the vulcanizing mold and put it into a steam vulcanizing tank for 30 minutes at a vulcanizing temperature of 165℃ to obtain the turbocharger tube.

[0057] Examples 2-6

[0058] Examples 2-6 are based on the method of Example 1, with adjustments made to the composition of the AEM rubber layer and the EPDM rubber layer. The specific adjustments are shown in Table 2 below.

[0059] Table 2: Adjustment of AEM rubber layer / EPDM rubber layer components in Examples 1-6

[0060]

[0061]

[0062] Examples 7-14

[0063] Examples 7-14 are based on the method of Example 1, with adjustments made to the composition of the AEM rubber layer. For details of the adjustments, please refer to Table 3 below.

[0064] Table 3. Adjustment of the composition of the AEM rubber layer / EPDM rubber layer in Examples 7-14

[0065]

[0066]

[0067] Examples 15-20

[0068] Examples 15-20 are based on the method of Example 1, with adjustments made to the composition of the EPDM rubber layer. For details of the adjustments, please refer to Table 4 below.

[0069] Table 4: Adjustment of Components in AEM / EPDM Rubber Layers in Examples 15-20

[0070]

[0071] Examples 21-22

[0072] Examples 21-22 are based on the method of Example 1, with adjustments made to the manufacturing process parameters of the turbocharger tube. The specific adjustments are shown in Table 3 below.

[0073] Table 3. Adjustment of process parameters for the preparation of turbocharger pipes in Examples 1 and 21-22

[0074]

[0075] Example 23

[0076] In Example 23, based on the method of Example 1, the inner layer of the turbocharger pipe is set as an AEM rubber layer, and the outer layer is composed of an EPDM rubber layer and an AEM rubber layer from the inside to the outside. The thickness of the outer AEM rubber layer is 0.3 mm, the thickness of the EPDM rubber layer is 4.7 mm, and the thickness of the inner AEM rubber layer is 5 mm.

[0077] Example 24

[0078] In Example 24, based on the method of Example 1, the outer layer of the turbocharger pipe is set as an AEM rubber layer, and the inner layer consists of an AEM rubber layer and an EPDM rubber layer from the inside to the outside. The thickness of the inner AEM rubber layer is 0.3 mm, the thickness of the EPDM rubber layer is 4.7 mm, and the thickness of the outer AEM rubber layer is 5 mm.

[0079] Examples 25-26

[0080] Examples 25-26 are based on the method of Example 1, with adjustments made to the thickness of the AEM rubber layer and EPDM rubber layer of the turbocharger pipe. The specific adjustments are shown in Table 4 below.

[0081] Table 4. Thickness Adjustment of AEM and EPDM Rubber Layers for Turbocharger Pipes in Examples 1 and 25-26

[0082]

[0083] Comparative Example

[0084] Comparative Example 1

[0085] Comparative Example 1 is based on the method of the embodiment, with both the inner and outer layers being AEM rubber layers with a thickness of 5 mm.

[0086] Comparative Example 2

[0087] Comparative Example 1 is based on the method of the embodiment, with both the inner and outer layers being EPDM rubber layers with a thickness of 5 mm.

[0088] Comparative Example 3

[0089] Comparative Example 3 uses a different type of AEM rubber than the method in the examples, specifically HT-AEM rubber.

[0090] Performance testing

[0091] To further investigate the effects of each component and preparation parameters on the turbocharger pipe, this application further conducts the following verification embodiments.

[0092] Adhesion: Whether interlayer failure occurs.

[0093] Heat resistance: The thermal aging stability was tested according to VDA675 310, under the conditions of 150±2℃ for 42 days. The changes in hardness, tensile strength and elongation at break of the test sample before and after the experiment were measured.

[0094] Oil resistance: Tested according to VW50123, with fuel loss measured by weighing after each 24-hour period converted to 1m³. 2 The internal area of ​​the hose, calculated from the maximum value of four measurements, is used as the permeability in g / 24h / m². 2 express.

[0095] Table 5 shows the performance test results of Examples 1-27 and Comparative Examples 1-4.

[0096]

[0097]

[0098] Referring to Table 5, the component ratios of the AEM rubber layer and the EPDM rubber layer in Examples 1-6 were compared. The results showed that replacing part of the AEM rubber layer with the EPDM rubber layer significantly reduced the cost of the turbocharger pipe. Furthermore, Examples 1-6 exhibited superior oil resistance, heat resistance, and adhesion, with Example 1 showing the best oil resistance and heat resistance, and no interlayer damage occurred between the AEM rubber layer and the EPDM rubber layer.

[0099] Compared with Example 1, Example 2 investigated the effect of adding N550 carbon black to the AEM rubber layer. The results showed that the oil resistance of the turbocharger pipe without N550 carbon black was similar to that of Example 1, and no interlaminar failure occurred, but the change rate of tensile strength was poor.

[0100] Compared with Example 1, Example 3 investigated the effect of adding the flow aid VAM to the AEM rubber layer. The results showed that the oil resistance and heat resistance of the turbocharger pipe without the addition of the flow aid VAM were similar to those of Example 1, but the adhesion between the AEM rubber layer and the EPDM rubber layer was poor.

[0101] Compared with Example 1, Example 4 investigated the effect of adding antioxidant 445 to the AEM rubber layer. The results showed that the oil resistance and adhesion of the turbocharger pipe without antioxidant 445 were similar to those of Example 1, but the thermal aging stability was poor.

[0102] Compared with Example 1, Example 5 investigated the effect of adding N774 carbon black to the EPDM rubber layer. The results showed that the adhesion between the AEM rubber layer and the EPDM rubber layer in the turbocharger pipe without the addition of N774 carbon black was poor, but the oil resistance and heat resistance were similar to those in Example 1.

[0103] Compared with Example 1, Example 6 investigated the effect of adding N550 carbon black to the EPDM rubber layer. The results showed that the oil resistance and adhesion between the AEM rubber layer and the EPDM rubber layer in the turbocharger pipe without N774 carbon black were similar to those in Example 1, but the heat resistance was slightly worse than that in Example 1.

[0104] Furthermore, using Example 1 as a control, this application investigated the effect of the amount of N550 carbon black added to the AEM rubber layer in Examples 7 and 8. The results showed that Example 1 was relatively superior.

[0105] Furthermore, using Example 1 as a control, this application investigated the effect of the amount of flow aid VAM added to the AEM rubber layer in Examples 9 and 10. The results showed that Example 1 was relatively superior.

[0106] Furthermore, using Example 1 as a control, this application investigated the effect of the amount of antioxidant 445 added to the AEM rubber layer in Examples 11 and 12. The results showed that Example 1 was relatively superior.

[0107] Furthermore, using Example 1 as a control, this application investigated the effects of the amount of plasticizer TOTM, accelerator TAIC, and vulcanizing agent BIPB added to the AEM rubber layer in Examples 13 and 14. The results showed that Example 1 was relatively superior.

[0108] Furthermore, using Example 1 as a control, this application investigated the effects of the amount of N550 carbon black and N774 carbon black added to the EPDM rubber layer in Examples 15 and 16. The results showed that Example 1 was relatively superior.

[0109] Furthermore, using Example 1 as a control, this application investigated the effect of the addition ratio of N550 carbon black and N774 carbon black in the EPDM rubber layer in Examples 17 and 18. The results showed that Example 1 was relatively superior.

[0110] Furthermore, using Example 1 as a control, this application investigated the effects of the addition amounts of plasticizer paraffin oil, flow aid PEG400, antioxidant MB, accelerator TAIC, and vulcanizing agent BIPB in the EPDM rubber layer in Examples 19 and 20. The results showed that Example 1 was relatively superior.

[0111] Furthermore, with Example 1 as a control, this application investigated the effects of the mixing and extrusion temperatures of the AEM rubber layer and the EPDM rubber layer in the turbocharger tube manufacturing process in Examples 21 and 22. The results showed that Example 1 was relatively superior.

[0112] Furthermore, using Example 1 as a control, this application investigated the effect of replacing the AEM rubber layer in different parts with an EPDM rubber layer in Examples 23 and 24. The results showed that the oil resistance and heat resistance of Example 1 were slightly lower than those of Examples 23 and 24, but the cost of Example 1 was significantly lower than that of Examples 23 and 24.

[0113] Furthermore, taking Example 1 as a comparison, this application investigated the effect of the thickness of the AEM rubber layer and EPDM rubber layer in the turbocharger pipe in Examples 25 and 26. The results showed that when the thickness of the AEM rubber layer was less than 0.3 mm, the oil resistance of the turbocharger pipe decreased slightly. Considering the economic benefits, this application prefers the thickness of the AEM rubber layer and EPDM rubber layer in Example 1.

[0114] Furthermore, comparing Example 1 with Comparative Example 1, it was found that the oil resistance of Example 1 was slightly lower than that of Comparative Example 1, but the preparation cost of Example 1 was significantly lower than that of Comparative Example 1.

[0115] Furthermore, comparing Example 1 with Comparative Example 2, it was found that the oil resistance and heat resistance of Example 1 were significantly higher than those of Comparative Example 1.

[0116] Furthermore, comparing Example 1 with Comparative Example 3, it was found that obvious interlayer damage occurred between the AEM rubber layer and the EPDM rubber layer in Comparative Example 3, and its oil resistance and heat resistance were significantly lower than those of Example 1.

[0117] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A turbocharger pipe, characterized in that: It includes an inner layer and an outer layer, wherein the inner layer and / or the outer layer are composed of an EPDM rubber layer and an AEM rubber layer; The AEM rubber layer comprises, by weight, 100 parts ethylene acrylate rubber, 30-50 parts carbon black, 5-15 parts plasticizer, 0.1-2 parts flow aid, 1-3 parts antioxidant, 0.1-3 parts accelerator, and 0.1-2 parts vulcanizing agent; The EPDM rubber layer comprises, by weight, 100 parts of EPDM rubber, 60-100 parts of carbon black, 20-60 parts of plasticizer, 0.1-2 parts of flow aid, 0.1-2 parts of antioxidant, 1-3 parts of accelerator, and 3-6 parts of vulcanizing agent.

2. The turbocharger pipe according to claim 1, characterized in that: The ethylene acrylate rubber used is VMX2122-AEM.

3. The turbocharger pipe according to claim 1, characterized in that: The flow aid for the AEM rubber layer is vinyl acetate.

4. The turbocharger pipe according to claim 1, characterized in that: The carbon black used in the EPDM rubber layer is one or both of N550 and N774.

5. The turbocharger pipe according to claim 1, characterized in that: The antioxidant for the AEM rubber layer is 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine.

6. The turbocharger pipe according to claim 1, characterized in that: It also includes a reinforcing layer made of aramid yarn with a tensile strength ≥200N / thread, a twist of 75-125TPM, and a density of 1100≤2000dtex.

7. The method for preparing a turbocharger pipe according to any one of claims 1-6, characterized in that: Includes the following steps: S1, AEM rubber layer, EPDM rubber layer compounding S1.1 Preparation of AEM rubber layer compound: Add VMX2122-AEM and antioxidant 445 to the internal mixer and mix for 30s; then add N550 carbon black and plasticizer TOTM and mix for 80s; finally add flow aid VAM, accelerator TAIC and vulcanizing agent BIPB and continue mixing for 140s. S1.2 Preparation of EPDM rubber layer compound: PX-008M and antioxidant MB are added to a mixer and mixed under pressure for 50s; then N774 carbon black, N550 carbon black and TU16 paraffin oil are added and mixed for 80s; finally, flow aid PEG400, accelerator TAIC and vulcanizing agent BIPB are added and mixed for another 140s. S2, Extruded AEM rubber layer, EPDM rubber layer The mandrel is pulled by a traction machine through an AEM rubber extruder and an EPDM rubber extruder in sequence, so that the EPDM rubber layer and the AEM rubber layer are extruded and coated on the surface of the mandrel in sequence, thus initially obtaining a wire roller; S3, Braided Reinforcement Layer The yarn roller obtained from S2 is placed on the pay-off frame of the reinforcing layer braiding machine. The braiding machine braids the rubber tube semi-finished product and automatically winds it onto another yarn roller after braiding is completed. The raw material of the reinforcing layer is 2000D aramid yarn. S4, extruded EPDM rubber layer, AEM rubber layer The linear roller obtained in S3 is pulled by a traction machine and passed through an EPDM rubber extruder and an AEM rubber extruder in sequence, so that the EPDM rubber layer and the AEM rubber layer are extruded and coated on the surface of the linear roller obtained in S3 in sequence, and then coiled on a vulcanizing disc by a traction device. S5 vulcanization Cut the vulcanizing disc according to requirements and blow out the mandrel with an air gun. Place the resulting tube blank on the vulcanizing mold and put it into a steam vulcanizing tank for 30 minutes at a vulcanizing temperature of 165℃ to obtain the turbocharger tube.

8. The method for preparing the turbocharger pipe according to claim 7, characterized in that: The mixing temperature of the AEM rubber layer in S1.1 is 120-140℃, and the extrusion temperature of the AEM rubber layer is 60-80℃.

9. The method for preparing the turbocharger pipe according to claim 7, characterized in that: The mixing temperature of the EPDM rubber layer in S1.2 is 130-150℃, and the extrusion temperature of the EPDM rubber layer is 70-90℃.

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