Material for automobile turbocharging pipe and processing and using method thereof

Abstract

The invention discloses a material for an automobile turbocharging pipe and a processing and using method of the material, and relates to the technical field of automobile part manufacturing. The invention discloses a material for an automobile turbine supercharging pipe. The material comprises 50-70 parts of polyamide resin and derivatives thereof, 12-20 parts of reinforced fibers, 5-20 parts of reinforcing filler, 5-8 parts of a compatilizer and 0.9-1.2 parts of an antioxidant. The polyamide resin and the derivative thereof are used as main materials, and are matched with the reinforcing fibers, the reinforcing filler, the compatilizer and the antioxidant in a specific proportion, so that a material of which the mechanical strength, the heat aging resistance, the low temperature resistance and the like are close to those of silicon rubber or fluororubber can be prepared; the comprehensive cost of the raw materials is far lower than the cost of silicon rubber or fluorine rubber, so that the material prepared from the raw materials can be used for preparing and producing the automobile turbine supercharging pipe instead of the silicon rubber or fluorine rubber, and the price of the material is greatly reduced on the basis of maintaining excellent mechanical properties; and the economic benefit of the turbine pressurizing pipe of the automobile can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts manufacturing, and in particular to a material for automobile turbocharger pipes and a processing and using method thereof. BACKGROUND

[0002] The automobile turbocharger system plays an important role in improving engine power and reducing emissions, and the performance of the turbocharger pipe as a key component directly affects the stability and reliability of the entire system.

[0003] Most of the automobile turbocharger pipes on the market are made of fluorine rubber, silicone rubber and other materials. These materials, with special molecular structure, can endow the automobile turbocharger pipe with excellent heat resistance and corrosion resistance, so that the automobile turbocharger pipe can work normally in harsh environments and meet the use requirements of the automobile under different working conditions. However, due to the high price of fluorine rubber, silicone rubber and other raw materials, and the need to consume a large amount of energy and the complicated and time-consuming processing technology in the processing process of the above-mentioned materials, the total production cost of the automobile turbocharger pipe is high, which is difficult to meet the requirements of large-scale production and has reached the bottleneck of industry development.

[0004] Although the industry has tried to reduce the cost by developing new synthetic rubber or improving the formula, but due to the lack of effective balance point, the performance stability is often sacrificed while reducing the cost, especially under extreme temperature conditions, the mechanical properties of the automobile turbocharger pipe are not satisfactory, and the performance decreases greatly. Therefore, with the rapid development of the new energy automobile market, how to greatly reduce the production cost of the automobile turbocharger pipe while ensuring its original performance and simplify its production and processing process has become a key problem to be solved in the industry. SUMMARY

[0005] In order to improve the performance stability of the material for automobile turbocharger pipe, reduce the production cost of the automobile turbocharger pipe while maintaining its original performance, and simplify its production and processing process, the present application provides a material for automobile turbocharger pipe and a processing and using method thereof.

[0006] In the first aspect, the material for automobile turbocharger pipe provided by the present application adopts the following technical scheme: A material for automobile turbocharger pipe, comprising the following raw materials by weight: Polyamide resin and its derivatives: 50-70 parts; Reinforcing fibers: 12-20 parts; Reinforcing fillers: 5-20 parts; Compatibility agent: 5-8 parts; Antioxidant: 0.9-1.2 parts.

[0007] By adopting the above technical scheme, the polyamide resin and its derivatives are used as the main material, and the reinforcing fiber, the reinforcing filler, the compatibilizer and the antioxidant are matched in a specific proportion, so that a material with mechanical strength, heat aging resistance and low temperature resistance close to that of silicone rubber or fluororubber can be prepared, and the material prepared from the above raw materials can be used to replace silicone rubber or fluororubber to prepare the automobile turbocharger pipe. Since the comprehensive cost of the raw materials in the above technical scheme is much lower than the cost of the commonly used silicone rubber or fluororubber in the industry, the material cost of the automobile turbocharger pipe can be greatly reduced, the material can be greatly reduced on the basis of maintaining the excellent mechanical properties of the automobile turbocharger pipe, and the economic benefit of the automobile turbocharger pipe can be improved. In addition, since the polyamide resin and its derivatives have good recyclability, compared with the characteristics that the traditional silicone rubber or fluororubber is not easy to recycle, it is conducive to further improving the environmental protection of the automobile turbocharger pipe, and can meet the growing demand for environmentally friendly materials in the market.

[0008] Optionally, the polyamide resin and its derivatives are at least one of PA6, PA66, PA11, PA12, PA9T, PA10T or polyamide elastomer.

[0009] Optionally, the polyamide resin and its derivatives are a mixture of PA66, PA11 and PA10T, and the mixed mass ratio of the PA66, the PA11 and the PA10T is (5-8):(1-3):(1-2).

[0010] By adopting the above technical scheme, the material prepared can balance the mechanical strength, environmental resistance and processing efficiency, and its comprehensive performance is close to that of expensive silicone rubber and fluororubber, which is conducive to being used as a substitute material for silicone rubber or fluororubber to prepare automobile turbocharger pipes with high strength, heat resistance and low temperature resistance requirements.

[0011] Optionally, it also includes polyphenylene sulfide, and the addition amount of the polyphenylene sulfide is 20%-40% of the addition amount of the polyamide resin and its derivatives.

[0012] By adopting the above technical scheme, a small amount of polyphenylene sulfide is added to the polyamide resin and its derivatives, which can effectively improve the heat resistance of the prepared material, and further help to make the comprehensive performance of the prepared material closer to that of silicone rubber or fluororubber. However, since the processing performance of polyphenylene sulfide is poor, when the addition amount of polyphenylene sulfide is 20%-40% of the addition amount of the polyamide resin and its derivatives, the prepared material not only has comprehensive performance close to that of silicone rubber or fluororubber, but also maintains good processing performance.

[0013] Optionally, the polyamide resin and its derivatives are specifically fluorine-containing polyamide elastomers, and the preparation method of the fluorine-containing polyamide elastomers comprises the following steps: A1. Caprolactam, terephthalic acid, and water are fully mixed and added to a reactor, and heated in an inert atmosphere for prepolymerization. The product is extracted with deionized water multiple times and dried to obtain a double-terminated carboxyl polyamide prepolymer; A2. The dicarboxyl-terminated polyamide prepolymer, polytrimethylene ether glycol, perfluoropolyether glycol and tetrabutyl titanate obtained in step A1 are fully mixed and added to a reactor, and heated in an inert atmosphere for polymerization reaction to obtain a fluorine-containing polyamide elastomer.

[0014] By adopting the above technical solution, the fluorinated polyamide elastomer obtained has good mechanical strength and heat aging resistance. When combined with a specific proportion of reinforcing fiber, reinforcing filler, compatibilizer and antioxidant, the comprehensive performance of the obtained material is also close to that of silicone rubber or fluororubber. Moreover, the performance effect and processing performance achieved are better than those when polyamide resin or polyamide resin and polyphenylene sulfide are used as the main materials. It is more suitable as an alternative material to replace silicone rubber or fluororubber to prepare turbine booster pipes.

[0015] Optionally, the reinforcing fiber includes at least one of alkali-free glass fiber, aramid fiber or carbon fiber, and the fiber length is 3-15 mm.

[0016] By adopting the above technical solution, the above fibers can significantly enhance the strength, modulus and impact resistance of polyamide resin and its derivatives, thereby effectively enhancing the performance of the obtained material, which is conducive to making the comprehensive performance of the obtained material close to that of silicone rubber or fluororubber.

[0017] Optionally, the reinforcing fibers are further subjected to surface pretreatment before being cut into short fibers. The method for preparing the reinforcing fibers subjected to surface pretreatment comprises the following steps: First, the precursor of the reinforcing fiber is soaked in an acidic solution, heated and stirred for 5-10 minutes, and rinsed until the cleaning solution is neutral to obtain acid-treated precursor. Then, the acid-treated precursor is soaked in a modified solution containing hexadecyltrimethylammonium chloride and silane coupling agent KH550 and soaked for 20-30 minutes. After soaking, it is taken out and dried, and then the soaked length of the acid-treated precursor is cut to the set length to obtain the reinforcing fiber.

[0018] By adopting the above technical solution, the reinforcing fibers are immersed and modified using a modification solution containing hexadecyltrimethylammonium chloride and a silane coupling agent KH550, which can improve the surface properties of the reinforcing fibers and the bonding strength with the polyamide resin and its derivatives, thereby helping to enhance the reinforcing effect of the reinforcing fibers. Furthermore, lower-cost reinforcing fibers can be used in combination with the immersion modification to obtain a material with better overall performance, which is conducive to further controlling the raw material cost of the material and making it more cost-effective.

[0019] Optionally, the reinforcing filler is a mixture of at least one of talc, montmorillonite or kaolin and ultra-fine calcium carbonate, and the particle size of the reinforcing filler ranges from 0.05 μm to 5 μm.

[0020] By using the above technical solution, talc, montmorillonite or kaolin and the like all belong to silicate fillers with high strength and heat resistance, and are dispersed in polyamide resin and its derivatives together with ultra-fine calcium carbonate, which can effectively improve the mechanical strength and impact resistance of polyamide, and increase the heat distortion temperature of polyamide, so that the material can still maintain good mechanical properties and dimensional stability at a high temperature. In addition, talc, montmorillonite or kaolin and the like can also play a certain heat insulation role, thereby reducing the heat transfer to the inside of the material, which is conducive to delaying the thermal aging process of polyamide and further improving the long-term heat resistance and service life of the material.

[0021] Optionally, the compatilizer is maleic anhydride grafted EPDM rubber; the antioxidant is a mixture of sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide, and the mass ratio of sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide is 1:(0.2-0.4):(0.1-0.3).

[0022] By using the above technical solution, maleic anhydride grafted EPDM rubber can effectively improve the compatibility of other raw materials with polyamide resin and its derivatives, improve the dispersibility of each raw material in polyamide resin and its derivatives, so that other raw materials can be more uniformly distributed in the polyamide matrix, which is conducive to reducing the agglomeration phenomenon and enhancing the interaction between other raw materials and the resin, and fully exerting the modification effect. In addition, when the antioxidant is a mixture of sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide, the synergistic effect between sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide can effectively improve the heat oxidation resistance and hydrolysis resistance of polyamide resin and its derivatives, so that they are not prone to aging, degradation and other problems in a high-temperature and high-humidity environment, which is conducive to prolonging the service life of the material and expanding its application range in high-temperature and high-humidity application scenarios.

[0023] In a second aspect, the processing method of the material for the automobile turbocharged pipe provided by the present application adopts the following technical solution: The processing method of the material for the automobile turbocharged pipe comprises the following steps: The raw materials are fully stirred and mixed at room temperature according to the proportion, and the mixing time is not less than 20 min to obtain a preliminary mixture. Then, the preliminary mixture is melt-extruded and granulated by using an extruder to obtain a material for the automobile turbocharged pipe, which is stored in a cool and dry place for standby use.

[0024] By adopting the above technical solution, the selected material has good processing performance, which not only reduces the energy consumption required for material preparation and granulation, but also simplifies the material preparation and granulation process, which is conducive to controlling the overall total production cost of automobile turbocharger pipes.

[0025] In a third aspect, the present application provides a method for using a material for an automotive turbocharger pipe using the following technical solution: A method for using a material for an automobile turbocharger pipe comprises the following steps: S1. Place the material in an oven and heat it to 80-120°C, and continue drying for 2-6 hours until the moisture content of the material is less than 0.1% to obtain a dry material; S2. According to the structure and performance requirements of the automobile turbocharger pipe, a processing technology such as extrusion, blow molding, and molding is selected to process the dry material obtained in step S1 to form an inner lining layer or outer covering layer of the automobile turbocharger pipe.

[0026] By adopting the above technical solution, the use methods of the obtained turbocharger pipe material are flexible and diverse, and different production processes can be selected for different pipeline structures of the turbocharger. It has high process adaptability and can effectively meet the production requirements of manufacturers with different production equipment.

[0027] In summary, the technical solution of this application has at least one of the following beneficial effects: 1. By using polyamide resin and its derivatives as the main materials, combined with specific proportions of reinforcing fibers, reinforcing fillers, compatibilizers and antioxidants, a material can be produced whose mechanical strength, heat aging resistance and low-temperature resistance are close to those of silicone rubber or fluororubber. Since the comprehensive cost of raw materials in the above technical solution is much lower than the cost of silicone rubber or fluororubber commonly used in the industry, the material made from the above raw materials can be used instead of silicone rubber or fluororubber to prepare and produce automotive turbocharger pipes, thereby achieving a significant price reduction of the material while maintaining the excellent mechanical properties of the automotive turbocharger pipe, thereby improving the cost-effectiveness and economic benefits of the automotive turbocharger pipe.

[0028] 2. By using polyamide resin and its derivatives as the main materials, and combining them with specific proportions of reinforcing fibers, reinforcing fillers, compatibilizers and antioxidants, the obtained material has good processing performance, and the processing and use methods are simple, flexible and diverse, and require less equipment. This is not only conducive to reducing the energy consumption required for material preparation or use, but also conducive to simplifying the process flow during material preparation or use, and is conducive to controlling the overall total production cost of automotive turbocharger pipes.

[0029] 3. By using polyamide resin and its derivatives as the main materials, the obtained materials have good recyclability, which is conducive to further improving the environmental protection of automobile turbocharger pipes and meeting the market's growing demand for environmentally friendly materials.

[0030] 4. By soaking and modifying the reinforcing fibers with a modification solution containing hexadecyltrimethylammonium chloride and silane coupling agent KH550, the reinforcing effect of the reinforcing fibers can be improved, and then lower-cost reinforcing fibers can be used in combination with soaking and modification to obtain materials with better comprehensive performance, which is beneficial to further control the raw material cost of the material and make it more cost-effective. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to preparation examples, embodiments and comparative examples.

[0032] Raw material price reference range: PA6, PA66: 20,000-40,000 yuan / ton.

[0033] PA11, PA12: 30,000-60,000 yuan / ton.

[0034] PA9T, PA10T: 50,000-80,000 yuan / ton.

[0035] Polyphenylene sulfide: 25,000-50,000 yuan / ton.

[0036] Silicone rubber: 80,000-150,000 yuan / ton.

[0037] Fluororubber: 200,000-300,000 yuan / ton.

[0038] Fluorosilicone rubber: 130,000-350,000 yuan / ton.

[0039] Alkali-free glass fiber: 4200-10000 yuan / ton.

[0040] Aramid fiber: 30,000-80,000 yuan / ton.

[0041] Industrial general-purpose carbon fiber: 160,000-200,000 yuan / ton.

[0042] Ultrafine calcium carbonate was purchased from Wuxin Materials, which is a heavy calcium carbonate with a mesh size of 2000; talc powder was purchased from Xinda Talc, with the brand name SD-9478; and montmorillonite was purchased from Nanocor, with the model number I.34TCN.

[0043] Preparation Example [Preparation Example 1] A fluorine-containing polyamide elastomer is prepared by the following steps: A1. 10 kg of caprolactam, 5 kg of phthalic acid and 0.2 kg of water were fully mixed and added to a reactor. Argon was continuously introduced and heated to 230 ° C in an argon atmosphere for prepolymerization for 3 hours. The mixture was then evacuated and the vacuum degree was maintained below XX for another 2 hours. After the reaction was completed, the mixture was cooled and taken out. It was extracted with deionized water at a temperature of 92 ° C. The extraction was repeated three times and then dried to obtain a double-end carboxyl polyamide prepolymer. A2. Take 10 kg of the dicarboxyl-terminated polyamide prepolymer obtained in step A1, 6 kg of polytrimethylene ether glycol, 3 kg of perfluoropolyether glycol, and 0.025 kg of tetrabutyl titanate, mix them thoroughly, and add them to the reactor. Continuously introduce argon gas, heat to 250 ° C in an argon atmosphere, and carry out polymerization reaction for 6 hours to obtain a fluorine-containing polyamide elastomer.

[0044] [Preparation Example 2] A fluorine-containing polyamide elastomer is prepared by the following steps: A1. 10 kg of caprolactam, 5 kg of phthalic acid and 0.2 kg of water were fully mixed and added to a reactor. Argon was continuously introduced and the mixture was heated to 250 ° C in an argon atmosphere for prepolymerization for 2 hours. The mixture was then evacuated and the vacuum degree was maintained below XX for another 2 hours. After the reaction was completed, the mixture was cooled and taken out. It was extracted with deionized water at a temperature of 96 ° C. The extraction was repeated three times and then dried to obtain a double-end carboxyl polyamide prepolymer. A2. Take 10 kg of the dicarboxyl-terminated polyamide prepolymer obtained in step A1, 4 kg of polytrimethylene ether glycol, 4 kg of perfluoropolyether glycol and 0.02 kg of tetrabutyl titanate, mix them thoroughly and add them to the reactor. Continuously introduce argon gas and heat to 270° C. in an argon atmosphere to carry out polymerization reaction for 6 hours to obtain a fluorinated polyamide elastomer. Example

[0045] [Example 1] A material for an automobile turbocharger pipe comprises the following raw materials: 7 kg of polyamide resin, 1.4 kg of reinforcing fiber, 1 kg of reinforcing filler, 0.5 kg of maleic anhydride-grafted EPDM rubber, and 0.12 kg of antioxidant.

[0046] Among them, the polyamide resin is a mixture of PA66, PA11 and PA10T mixed in a mass ratio of 5:3:2, that is, it includes 3.5kg PA66, 2.1kg PA11 and 1.4kg PA10T; the reinforcing fiber is alkali-free glass fiber, and the fiber length is 3-5mm; the reinforcing filler is a mixture of ultrafine calcium carbonate and talc powder mixed in a mass ratio of 4:1, that is, it includes 0.8kg ultrafine calcium carbonate and 0.2kg talc powder; the antioxidant is a mixture of sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide mixed in a mass ratio of 1:0.2:0.3, that is, it includes 0.08kg sodium hypophosphite, 0.016kg N,N-diphenyl-p-phenylenediamine and 0.024kg polycarbodiimide.

[0047] A method for processing a material for an automobile turbocharger pipe comprises the following steps: The raw materials are fully stirred and mixed in proportion at room temperature for 30 minutes to obtain a primary mixture, which is then melt-extruded and granulated using an extruder to obtain a material for automotive turbocharger pipes. The material is stored in a cool and dry place for future use.

[0048] A method for using a material for an automobile turbocharger pipe comprises the following steps: S1. Place the material in an oven and heat it to 105°C, and continue drying for 3 hours until the moisture content of the material is less than 0.1% to obtain dry pellets; S2. According to the structure and performance requirements of the automobile turbocharger pipe, a processing technology such as extrusion, blow molding, and molding is selected to process the dry material obtained in step S1 to form an inner lining layer or outer covering layer of the automobile turbocharger pipe.

[0049] [Example 2] A material for an automobile turbocharger pipe comprises the following raw materials: 6 kg of a polyamide resin derivative, 1.8 kg of reinforcing fiber, 1.3 kg of reinforcing filler, 0.8 kg of maleic anhydride-grafted EPDM rubber, and 0.09 kg of an antioxidant.

[0050] Among them, the polyamide resin derivative is a fluorine-containing polyamide elastomer prepared in [Preparation Example 1]; the reinforcing fiber is aramid fiber, and the fiber length is 10-12 mm; the reinforcing filler is a mixture of ultrafine calcium carbonate, montmorillonite or kaolin in a mass ratio of 3.2:1:1, that is, it includes 0.8 kg of ultrafine calcium carbonate, 0.25 kg of montmorillonite and 0.25 kg of kaolin; the antioxidant is a mixture of sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide in a mass ratio of 1:0.4:0.1, that is, it includes 0.06 kg of sodium hypophosphite, 0.024 kg of N,N-diphenyl-p-phenylenediamine and 0.006 kg of polycarbodiimide.

[0051] A method for processing a material for an automobile turbocharger pipe comprises the following steps: The raw materials are fully stirred and mixed in proportion at room temperature for 20 minutes to obtain a primary mixture, which is then melt-extruded and granulated using an extruder to obtain a material for automotive turbocharger pipes. The material is stored in a cool and dry place for future use.

[0052] A method for using a material for an automobile turbocharger pipe comprises the following steps: S1. Place the material in an oven and heat it to 120°C, and continue drying for 2 hours until the moisture content of the material is less than 0.1% to obtain dry pellets; S2. According to the structure and performance requirements of the automobile turbocharger pipe, a processing technology such as extrusion, blow molding, and molding is selected to process the dry material obtained in step S1 to form an inner lining layer or outer covering layer of the automobile turbocharger pipe.

[0053] [Example 3] A material for automobile turbocharger pipes, which differs from [Example 1] in that the polyamide resin is different.

[0054] In this embodiment, the polyamide resin is a mixture of PA66, PA11 and PA10T in a mass ratio of 6:3:1, that is, it includes 4.2 kg of PA66, 2.1 kg of PA11 and 0.7 kg of PA10T.

[0055] [Example 4] A material for automobile turbocharger pipes, which differs from [Example 3] in that the polyamide resin is different.

[0056] In this embodiment, the polyamide resin is replaced with a mixture of polyamide resin and polyphenylene sulfide in equal amounts, specifically comprising 5.8 kg of polyamide resin and 1.2 kg of polyphenylene sulfide. The polyamide resin is also a mixture of PA66, PA11, and PA10T in a mass ratio of 6:3:1, namely comprising 3.48 kg of PA66, 1.74 kg of PA11, and 0.58 kg of PA10T.

[0057] [Example 5] A material for automobile turbocharger pipes, which differs from [Example 3] in that the polyamide resin is different.

[0058] In this embodiment, the polyamide resin is replaced with a mixture of polyamide resin and polyphenylene sulfide in equal amounts, specifically comprising 5 kg of polyamide resin and 2 kg of polyphenylene sulfide. The polyamide resin is also a mixture of PA66, PA11, and PA10T in a mass ratio of 6:3:1, namely comprising 3 kg of PA66, 1.5 kg of PA11, and 0.5 kg of PA10T.

[0059] [Example 6] A material for automobile turbocharger pipes, which differs from [Example 1] in that the polyamide resin is different.

[0060] In this embodiment, the polyamide resin is replaced by an equal amount of a fluorinated polyamide elastomer, wherein the fluorinated polyamide elastomer is specifically selected from the fluorinated polyamide elastomer prepared in [Preparation Example 2].

[0061] [Example 7] A material for automobile turbocharger pipes, which differs from [Example 6] in that the reinforcing fibers are different.

[0062] In this embodiment, the reinforcing fibers are aramid fibers, and the fiber length is 3-5 mm.

[0063] [Example 8] A material for automobile turbocharger pipes, which differs from [Example 6] in that the reinforcing fibers are different.

[0064] In this embodiment, the reinforcing fibers are carbon fibers, and the fiber length is 3-5 mm.

[0065] [Example 9] A material for automobile turbocharger pipes, which differs from [Example 6] in that the reinforcing fibers are different.

[0066] In this embodiment, the reinforcing fibers are further subjected to surface pretreatment before being cut into short fibers. Specifically, the method for preparing the surface pretreated reinforcing fibers comprises the following steps: First, 2 kg of the raw fiber of the reinforcing fiber was soaked in a dilute sulfuric acid solution with a concentration of 5%, heated and stirred for 5 minutes, and rinsed until the cleaning liquid was neutral to obtain the acid-treated raw fiber. Then, the acid-treated raw fiber was soaked in a modified solution containing hexadecyltrimethylammonium chloride and silane coupling agent KH550 for 30 minutes. After soaking, it was taken out and dried. Then, the soaked length of the acid-treated raw fiber was cut to the set length to obtain the reinforcing fiber.

[0067] The modified solution is specifically prepared by mixing 1 kg of hexadecyltrimethylammonium chloride, 0.5 kg of silane coupling agent KH550 and 8.5 kg of deionized water.

[0068] Comparative Example [Comparative Example 1] A material for an automobile turbocharger pipe is selected from methyl vinyl silicone rubber purchased on the market, with a specific model being DY-VMQ101.

[0069] [Comparative Example 2] A material for an automobile turbocharger pipe is made of commercially available fluororubber, specifically FKM-CA100, which has a fluorine content of 67.5%.

[0070] [Comparative Example 3] A material for automobile turbocharger pipes, which differs from [Example 1] in that no antioxidant is added.

[0071] [Comparative Example 4] A material for automobile turbocharger pipes, which differs from [Example 1] in that no reinforcing fiber is added.

[0072] Performance test data Preparation of test samples: The turbocharger pipe materials prepared in each embodiment and comparative example were made into molded test pieces with a thickness of 2 mm through extrusion, flat plate vulcanization and other processes, and used as test samples.

[0073] 1. Mechanical strength: Test according to GB / T 528-2009 Vulcanized rubber or thermoplastic rubber - Determination of tensile stress-strain properties, and record the tensile strength (MPa) of the samples prepared in each embodiment and comparative example.

[0074] 2. Heat Aging Resistance: Tested according to 7.1 of GB / T 33381-2016 Specification for Rubber Hose for Automotive Turbochargers, with a test temperature of 240°C and a test time of 168 hours. Record the percentage change (%) of tensile strength and elongation at break for each Example and Comparative Example, rounded to one decimal place. Positive numbers indicate improved performance, negative numbers indicate decreased performance.

[0075] 3. Low temperature resistance: Tested with reference to 7.1 of GB / T 33381-2016 Specification for Rubber Hose for Automotive Turbochargers, where the test temperature was -40°C, and the damage of each embodiment and comparative example was recorded.

[0076] Table 1 Partial performance test data of materials used in automobile turbocharger pipes Combining Example 1 and Comparative Examples 1-2 with the data in Table 1, it can be seen that by using polyamide resin as the main material and combining it with a specific proportion of reinforcing fiber, reinforcing filler, compatibilizer and antioxidant, a material with mechanical strength, heat aging resistance and low temperature resistance that are close to those of silicone rubber or fluororubber can be obtained, and this material can be suitable for the production of automotive turbocharger pipes. Since the comprehensive cost of the selected raw materials is much lower than the cost of silicone rubber or fluororubber commonly used in the industry, and its processing method and use method are relatively simple and convenient, the overall production cost of the automotive turbocharger pipe can be controlled by reducing material costs and simplifying the production process, thereby improving economic benefits.

[0077] Combining Example 1 and Comparative Example 3 with the data in Table 1, it can be seen that the antioxidant formed by mixing sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide can effectively improve the heat aging resistance of the prepared material, so that the prepared material maintains stable performance or a small decline in performance under long-term high temperature, which is beneficial to making the prepared material closer to silicone rubber or fluororubber. Among them, sodium hypophosphite and N,N-diphenyl-p-phenylenediamine can play a synergistic role in capturing free radicals and peroxides, and can effectively inhibit the oxidative degradation of polyamide resin and its derivatives during high-temperature processing and long-term use, which is beneficial for the material to maintain good appearance and mechanical properties for a long time; and the addition of polycarbodiimide can effectively reduce the terminal carboxyl groups of polyamide, reduce the probability of hydrolysis reaction of polyamide resin and its derivatives at high temperature, which is beneficial to improve the dimensional stability and mechanical properties of the material under high temperature and high humidity environment conditions, and thus help make the prepared material suitable for various complex working conditions like silicone rubber or fluororubber, meeting the needs of different application scenarios.

[0078] Combining Examples 1 and 3-5 with the data in Table 1, it can be seen that when the polyamide resin is a mixture of PA66, PA11, and PA10T in a mass ratio of (5-6):3:(1-2), when the PA10T in the polyamide resin is replaced with the lower-cost PA66 in equal amounts, although the mechanical strength and heat aging resistance of the resulting material decrease slightly, the performance decrease is not significant and remains in a relatively excellent range. In addition, the overall cost is significantly reduced, and the overall cost-performance ratio is higher. At the same time, when polyphenylene sulfide is used to replace part of the polyamide resin in equal amounts, the average cost does not increase, but the mechanical strength and heat stability of the resulting material are further improved. This may be because polyphenylene sulfide has higher strength and heat resistance than polyamide resin. The compatibilizer can form a compatible blend system between the polyamide resin and polyphenylene sulfide, thereby improving the thermal stability of the resulting material, making it less susceptible to thermal degradation or aging during high-temperature processing and use. However, due to the poor processing performance of polyphenylene sulfide, in order to ensure that the material has good subsequent processing performance, the addition amount of polyphenylene sulfide needs to be controlled at 20%-40% of the polyamide resin.

[0079] Combining Examples 5-6 and Comparative Examples 1-2 with the data in Table 1, it can be seen that by using a self-made fluorinated polyamide elastomer as the main ingredient and combining it with specific proportions of reinforcing fiber, reinforcing filler, compatibilizer, and antioxidant, the mechanical strength, heat aging resistance, and low-temperature resistance of the material produced are close to those of silicone rubber or fluororubber. Similarly, it is also suitable for the production of automotive turbocharger pipes. In addition, the performance effect achieved is superior to that when polyamide resin and polyphenylene sulfide are used as the main ingredients. At the same time, since polyphenylene sulfide is not added to the main ingredient, the processing performance of the material produced is better than that of the material produced when polyamide resin and polyphenylene sulfide are used as the main ingredients.

[0080] In conjunction with embodiment 1, embodiment 6-9 and comparative example 4 and in conjunction with the data of table 1, it can be known that when using polyamide resin and its derivatives as main ingredient, reinforcing fiber can effectively improve the mechanical strength of the obtained material, and can improve the heat aging resistance and low temperature resistance of material to a certain extent.Wherein relative to the alkali-free glass fiber with low cost, the aramid fiber and carbon fiber with higher cost are more excellent for the improvement effect of material, and the mechanical strength, heat aging resistance and low temperature resistance of the obtained polyamide material are closer to silicone rubber or even fluororubber.In addition, by the modification solution containing hexadecyltrimethylammonium chloride and silane coupling agent KH550, alkali-free glass fiber is soaked and modified, the alkali-free glass fiber that can effectively improve is to the reinforcing effect of polyamide material, makes the performance of the obtained material comparable to the performance of the polyamide material reinforced by aramid fiber or carbon fiber, and then is conducive to obtaining a kind of polyamide material that is close to or even exceeds silicone rubber or fluororubber in mechanical strength, heat aging resistance and low temperature resistance under the situation that comprehensive cost is lower, and is applied to prepare automobile turbocharger pipe and has higher cost performance.

[0081] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A material for automobile turbocharger pipe, characterized in that: Comprise the following raw materials by weight: Polyamide resin and its derivatives: 50-70 parts; Reinforcement fiber: 12-20 parts; Reinforcing filler: 5-20 parts; Compatibilizer: 5-8 parts; Antioxidant: 0.9-1.2 parts.

2. The automotive turbocharger pipe material according to claim 1, characterized in that : The polyamide resin and its derivatives are specifically a mixture of PA66, PA11 and PA10T, and the mixing mass ratio of the PA66, the PA11 and the PA10T is (5-6):3:(1-2).

3. The automotive turbocharger pipe material according to claim 2, characterized in that : Also includes polyphenylene sulfide, the addition amount of the polyphenylene sulfide is 20%-40% of the addition amount of the polyamide resin and its derivatives.

4. The automotive turbocharger pipe material according to claim 1, characterized in that The polyamide resin and its derivatives are specifically fluorinated polyamide elastomers, and the preparation method of the fluorinated polyamide elastomer comprises the following steps: A1. Caprolactam, terephthalic acid, and water are fully mixed and added to a reactor, and heated in an inert atmosphere for prepolymerization. The product is extracted with deionized water multiple times and dried to obtain a double-terminated carboxyl polyamide prepolymer; A2. The dicarboxyl-terminated polyamide prepolymer, polytrimethylene ether glycol, perfluoropolyether glycol and tetrabutyl titanate obtained in step A1 are fully mixed and added to a reactor, and heated in an inert atmosphere for polymerization reaction to obtain a fluorine-containing polyamide elastomer.

5. The automotive turbocharger pipe material according to claim 1, characterized in that : The reinforcing fiber includes at least one of alkali-free glass fiber, aramid fiber or carbon fiber, and the fiber length is 3-15 mm.

6. The automotive turbocharger pipe material according to claim 5, characterized in that The reinforcing fibers are required to undergo surface pretreatment before being cut into short fibers. The method for preparing the reinforcing fibers after surface pretreatment comprises the following steps: First, the precursor of the reinforcing fiber is soaked in an acidic solution, heated and stirred for 5-10 minutes, and rinsed until the cleaning solution is neutral to obtain acid-treated precursor. Then, the acid-treated precursor is soaked in a modified solution containing hexadecyltrimethylammonium chloride and silane coupling agent KH550 and soaked for 20-30 minutes. After soaking, it is taken out and dried, and then the soaked length of the acid-treated precursor is cut to the set length to obtain the reinforcing fiber.

7. The automotive turbocharger pipe material according to claim 1, characterized in that The reinforcing filler is a mixture of at least one of talc, montmorillonite or kaolin and ultrafine calcium carbonate.

8. The automotive turbocharger pipe material according to claim 1, characterized in that : The compatibilizer is maleic anhydride grafted EPDM rubber; The antioxidant is a mixture of sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide, and the mixing mass ratio of the sodium hypophosphite, N,N-diphenyl-p-phenylenediamine and polycarbodiimide is 1:(0.2-0.4):(0.1-0.3).

9. A method for processing a material for an automobile turbocharger pipe, for preparing the material for an automobile turbocharger pipe as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: The raw materials are fully stirred and mixed in proportion at room temperature for no less than 20 minutes to obtain a primary mixture, which is then melt-extruded and granulated using an extruder to obtain a material for automotive turbocharger pipes, which is then stored in a cool and dry place for future use.

10. A method for using a material for an automobile turbocharger pipe, applicable to the material for an automobile turbocharger pipe according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Place the material in an oven and heat it to 80-120°C, and continue drying for 2-6 hours until the moisture content of the material is less than 0.1% to obtain a dry material; S2. According to the structure and performance requirements of the automobile turbocharger pipe, a processing technology such as extrusion, blow molding, and molding is selected to process the dry material obtained in step S1 to form an inner lining layer or outer covering layer of the automobile turbocharger pipe.

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