Low-cost high-performance heavy truck air spring rubber compound and preparation method thereof

Abstract

The invention relates to a low-cost high-performance heavy truck air spring rubber compound and a preparation method thereof. The low-cost high-performance heavy truck air spring rubber compound comprises the following components: ethylene propylene diene monomer, hydrogenated nitrile rubber, a carbon black composition, calcium carbonate, naphthenic oil, an anti-aging agent composition, a vulcanizing agent, an accelerant composition and a compounding agent composition. The carbon black composition comprises white carbon black VN3 and carbon black N550, the accelerant composition comprises an accelerant ZDTP-50, an accelerant ZDEC-70, an accelerant ZBEC-70, an accelerant CBS-80 and an accelerant TMTD-75, and the compounding agent composition comprises a compounding agent SA, a compounding agent ZNOA and a compounding agent MA-L16. The low-cost and high-performance rubber compound for the air spring of the heavy truck, prepared by the invention, has the advantages of high performance, low cost, favorable processability and excellent aging resistance.

Description

Technical Field

[0001] The present invention relates to a low-cost and high-performance rubber compound for air springs of heavy trucks and a preparation method thereof, belonging to the technical field of rubber preparation. Background Art

[0002] With the booming development of the national economy, the sales volume of the automotive industry increases significantly every year. Rubber air springs are important key components in the vehicle suspension system. Currently, almost all foreign high-end vehicles, cars, and tractors are equipped with air suspension systems, and rubber air spring suspension systems are also being popularized in domestic mid- to high-end buses.

[0003] A rubber air spring is a curved capsule made by bonding rubber and wire mesh, commonly known as an air tire, corrugated air tire, airbag, leather tiger, etc. Both ends of the capsule need to be connected with two steel plates to form a compressed air chamber. Its performance directly affects the load-carrying capacity, driving stability, and riding comfort of the vehicle.

[0004] Traditional rubber compounds have problems such as high cost, unstable performance, insufficient oil resistance and heat resistance during the preparation process, and it is difficult to meet the usage requirements of air springs for heavy trucks. Therefore, developing a low-cost and high-performance rubber compound has important practical significance. Summary of the Invention

[0005] The present invention provides a low-cost and high-performance rubber compound for air springs of heavy trucks and a preparation method thereof, which has high performance, low cost, good processing performance, and excellent aging resistance.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A low-cost and high-performance rubber compound for air springs of heavy trucks, whose components include ethylene propylene diene monomer rubber (EPDM), hydrogenated nitrile butadiene rubber (HNBR), carbon black combination, calcium carbonate, naphthenic oil, antioxidant combination, vulcanizing agent, accelerator combination, and compounding agent combination. Among them, the carbon black combination includes white carbon black VN3 and carbon black N550, the selected grade of naphthenic oil is N10, the antioxidant combination includes antioxidant RD and antioxidant MB, the vulcanizing agent selects sulfur S-80HE, the accelerator combination includes accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80, and accelerator TMTD-75, and the compounding agent combination includes compounding agent SA, compounding agent ZNOA, and compounding agent MA-L16;

[0008] Further, by mass parts, each component includes the following: ethylene propylene diene monomer (EPDM) rubber is 40 - 80 parts, hydrogenated nitrile butadiene rubber (HNBR) is 20 - 60 parts, white carbon black VN3 is 20 parts, carbon black N550 is 60 parts, calcium carbonate is 10 parts, naphthenic oil N10 is 20 parts, antioxidant RD is 1.5 parts, antioxidant MB is 1.5 parts, sulfur S - 80HE is 2.5 parts, accelerator combination is 6 parts, compounding agent combination is 12 parts;

[0009] Further, in the accelerator combination, accelerator ZDTP - 50 is 1.2 parts, accelerator ZDEC - 70 is 1.2 parts, accelerator ZBEC - 70 is 1.2 parts, accelerator CBS - 80 is 1.2 parts, accelerator TMTD - 75 is 1.2 parts;

[0010] Further, the selected grade of the ethylene propylene diene monomer (EPDM) rubber is EP3092PM or EP3112PM or Keltan2470C or Keltan2470C;

[0011] Further, the selected grade of the hydrogenated nitrile butadiene rubber (HNBR) is HNBR4367 or HNBR1010 or HNBR4307 or HNBR3605;

[0012] According to the preparation method of the low - cost and high - performance heavy - duty truck air spring rubber compound, it specifically includes the following steps:

[0013] Step S1, prepare materials. First, prepare two basic rubbers, namely ethylene propylene diene monomer (EPDM) rubber and hydrogenated nitrile butadiene rubber (HNBR). Then, prepare white carbon black VN3, carbon black N550 and calcium carbonate. Next, prepare naphthenic oil N10. Then, prepare compounding agent SA, compounding agent ZNOA and compounding agent MA - L16. Next, prepare antioxidant RD and antioxidant MB. Finally, prepare sulfur S - 80HE, accelerator ZDTP - 50, accelerator ZDEC - 70, accelerator ZBEC - 70, accelerator CBS - 80 and accelerator TMTD - 75;

[0014] Step S2, input materials in stages for the first stage of mixing to make the mixed rubber A for standby. Among them, the first - stage mixing includes four times of mixing;

[0015] Step S3, conduct the second - stage mixing to ensure good mixing and dispersion, and then take off the sheet for standby. Among them, the second - stage mixing includes two times of mixing;

[0016] Further, in step S2, the ethylene propylene diene monomer (EPDM) rubber and the hydrogenated nitrile butadiene rubber (HNBR) are input into the internal mixer at a mass ratio of 2:3 - 4:1;

[0017] Further, in step S2, the first - stage mixing includes the following steps:

[0018] Step S21: First, put ethylene propylene diene monomer rubber (EPDM), hydrogenated nitrile butadiene rubber (HNBR), compounding agent SA, and compounding agent MA-L16 into a Banbury mixer for the first mixing, with a mixing time of 60 - 80 s.

[0019] Step S22: Put compounding agent ZNOA into the Banbury mixer, and then continue to put white carbon black VN3, carbon black N550, calcium carbonate, and naphthenic oil N10 into the Banbury mixer for the second mixing until the mixing temperature reaches 140 - 155 °C, and maintain the mixing time for 60 - 80 s.

[0020] Step S23: Put antioxidant RD and antioxidant MB into the Banbury mixer for the third mixing. After maintaining the mixing time for 60 - 80 s, conduct top ram cleaning.

[0021] Step S24: After cleaning, continue with the fourth mixing. After 60 - 80 s, unload the contact piece to prepare the mixed rubber A for use.

[0022] Furthermore, in step S3, the second mixing includes the following steps:

[0023] Step S31: Add sulfur S-80HE, accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80, and accelerator TMTD-75 to the mixed rubber A for the first mixing, and maintain the mixing time for 60 - 80 s.

[0024] Step S32: Conduct cleaning. After cleaning, continue with the second mixing, maintain the mixing time for 30 - 60 s, and after sufficient mixing and dispersion, take off the sheet for standby.

[0025] Through the above technical solutions, compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The low-cost and high-performance rubber compound for heavy truck air springs provided by the present invention uses a combination of ethylene propylene diene monomer rubber (EPDM) and hydrogenated nitrile butadiene rubber (HNBR), making the mixed rubber have more excellent comprehensive properties and better meeting the use requirements of heavy truck air springs under complex working conditions.

[0027] 2. The low-cost and high-performance rubber compound for heavy truck air springs provided by the present invention effectively reduces the production cost on the premise of not significantly reducing the rubber properties by reasonably using calcium carbonate as a filler; the addition of naphthenic oil and the combined use of various accelerators endow the rubber compound with good processing properties, including fluidity, dispersibility, and vulcanization characteristics, etc., improve the production efficiency, reduce the processing difficulty, and reduce the scrap rate.

[0028] 3. The low-cost and high-performance heavy truck air spring rubber compound provided by the present invention, through the reasonable selection and combination of anti-aging agents, endows the rubber compound with excellent aging resistance, enabling it to maintain stable performance during long-term use, reducing the failure and replacement frequency of air springs caused by aging, and lowering the usage cost and maintenance cost, which is superior to some existing technologies with insufficient aging resistance;

[0029] 4. The preparation method of the low-cost and high-performance heavy truck air spring rubber compound provided by the present invention starts from basic rubber and gradually introduces carbon black, fillers, softening and plasticizing agents, activators, other compounding agents, and vulcanization accelerators, which conforms to the action logic of each material during the mixing process. This sequence ensures that each material can be added at the most appropriate stage, laying a foundation for subsequent efficient and high-quality mixing, enabling better interaction and uniform dispersion among the materials during mixing, and ultimately enhancing the overall performance of the compound;

[0030] 5. The preparation method of the low-cost and high-performance heavy truck air spring rubber compound provided by the present invention includes four mixings in the first mixing stage, improving the mechanical properties of the compound, ensuring the uniformity of the compound quality, and preventing the overall product performance from being affected by local differences;

[0031] 6. The preparation method of the low-cost and high-performance heavy truck air spring rubber compound provided by the present invention further facilitates the formation of a stable and excellent cross-linked structure in the second mixing stage, enabling the finally produced heavy truck air spring rubber products to possess properties such as high strength and high elasticity that meet the actual usage requirements. Detailed Embodiments

[0032] The present invention will now be described in further detail.

[0033] To solve the problems in the background art, the present application provides a low-cost and high-performance heavy truck air spring rubber compound, whose components include ethylene propylene diene monomer rubber, hydrogenated nitrile butadiene rubber, carbon black combination, calcium carbonate, naphthenic oil, anti-aging agent combination, vulcanizing agent, accelerator combination, and compounding agent combination.

[0034] As the first innovation of this application, in the prior art, a single rubber variety or a simple rubber blend system may be used, while this application uses a blend of ethylene propylene diene monomer (EPDM) rubber and hydrogenated nitrile butadiene rubber (HNBR), combining the advantages of both. EPDM rubber has excellent properties such as excellent weather aging resistance, excellent heat resistance, excellent resistance to media, good resistance to insulation and corona, excellent ozone resistance, etc. EPDM rubber can be used in natural environments such as sunlight, humidity, and cold. The carbon-containing EPDM vulcanizate can still not crack after being exposed to sunlight for three years. EPDM rubber has good resistance to various polar chemical drugs, acids, and alkalis, with little change after long-term contact. At the same time, EPDM rubber also has good elasticity and compression set resistance. Due to the relatively low density of EPDM rubber, it is easy to accommodate reinforcing agents and softening agents, and can be highly filled to reduce costs. HNBR is a high-performance synthetic rubber with excellent oil resistance, heat resistance, chemical corrosion resistance, ozone resistance, high strength, and high tear strength. It also has excellent processing performance. The combination of the two better meets the usage requirements of heavy truck air springs under complex working conditions.

[0035] Preferably, the grade of the EPDM rubber selected is EP3092PM or EP3112PM or Keltan2470C or Keltan2470C. The grade of the HNBR selected is HNBR4367 or HNBR1010 or HNBR4307 or HNBR3605.

[0036] In terms of the reinforcing system, this application uses a carbon black combination, including white carbon black VN3 and carbon black N550. Carbon black N550 is a fast extrusion furnace black. Both it and white carbon black VN3 have very little odor. At the same time, both have medium reinforcing effects, relatively high structure, smooth particle surfaces, low compression set, and can especially endow the rubber compound with high stiffness, fast extrusion speed, and smooth extrusion surface. Its reinforcing ability is higher than that of other soft carbon blacks, and its wear resistance is also relatively good. The combined use of white carbon black and carbon black can provide a more comprehensive reinforcing effect than using a single reinforcing agent, significantly improving the mechanical properties of the rubber.

[0037] Calcium carbonate is used as a filler to increase the viscosity of the rubber compound, increase stiffness, have a smooth surface, and reduce the shrinkage rate. At the same time, it can reduce the rubber content in the formulation and save costs. The grade of the naphthenic oil selected is N10. As a softening and plasticizing agent, it has good compatibility with EPDM rubber and HNBR, a relatively high flash point, is not easy to evaporate, and has no pungent odor. It is also used to increase the plasticity, fluidity, and adhesiveness of the rubber compound in rubber processing, facilitating process operations such as calendering and molding, and helping to disperse powdery compounding agents and reduce the mixing temperature.

[0038] The antioxidant combination includes antioxidant RD and antioxidant MB. The combination of the two greatly improves the high-temperature aging resistance of the rubber compound. Even if the product is used in a high-temperature environment for a long time, its performance remains unchanged. It is used to improve the high-temperature aging resistance of the rubber compound and reduce the failure and replacement frequency of air springs caused by aging.

[0039] The compounding agent combination includes compounding agent SA, compounding agent ZNOA, and compounding agent MA-L16. Among them, compounding agent ZNOA can increase the crosslinking density of the rubber compound and activate the entire vulcanization system. Compounding agent SA has the functions of softening and accelerating, which is also beneficial to the full diffusion of carbon black. As a rubber processing aid, compounding agent MA-L1 can improve the uniform dispersion of compounding agents during mixing and make the rubber compound easy to process.

[0040] As for the vulcanization accelerator, sulfur S-80HE is selected. The accelerator combination includes accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80, and accelerator TMTD-75, which can shorten the vulcanization time, improve the crosslinking efficiency, and reduce the vulcanization temperature, etc.

[0041] This application also gives the optimal ratio range of related components. By mass parts, each component includes the following: ethylene propylene diene monomer rubber is 40 - 80 parts, hydrogenated nitrile rubber is 20 - 60 parts, white carbon black VN3 is 20 parts, carbon black N550 is 60 parts, calcium carbonate is 10 parts, naphthenic oil N10 is 20 parts, antioxidant RD is 1.5 parts, antioxidant MB is 1.5 parts, sulfur S-80HE is 2.5 parts, the accelerator combination is 6 parts, and the compounding agent combination is 12 parts. In the accelerator combination, accelerator ZDTP-50 is 1.2 parts, accelerator ZDEC-70 is 1.2 parts, accelerator ZBEC-70 is 1.2 parts, accelerator CBS-80 is 1.2 parts, and accelerator TMTD-75 is 1.2 parts.

[0042] To achieve the optimal performance of the mixed rubber, relevant preparation methods are also required. This application provides a preparation method for the low-cost and high-performance heavy truck air spring rubber mixed rubber, which specifically includes the following steps:

[0043] Step S1, prepare materials. First, prepare two basic rubbers, namely ethylene propylene diene monomer rubber and hydrogenated nitrile rubber. Then, prepare white carbon black VN3, carbon black N550, and calcium carbonate. Continue to prepare naphthenic oil N10. Then, prepare compounding agent SA, compounding agent ZNOA, and compounding agent MA-L16. Continue to prepare antioxidant RD and antioxidant MB. Finally, prepare sulfur S-80HE, accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80, and accelerator TMTD-75.

[0044] Preparing materials in the order of "ethylene propylene diene monomer rubber, hydrogenated nitrile butadiene rubber → carbon black, fillers → softening and plasticizing agents → activators, other compounding agents → vulcanization accelerators" has clear logic and many advantages. First, prepare the two basic rubbers, namely ethylene propylene diene monomer rubber and hydrogenated nitrile butadiene rubber. This is the key starting point for building the performance basis of the blended rubber. Placing carbon black and fillers after the basic rubbers is because carbon black, as an important reinforcing agent and filler, needs to be fully mixed with the rubber and play its role during the mixing process. Preparing it in advance can ensure the efficient progress of subsequent mixing processes. The softening and plasticizing agents are relatively easy to disperse. Preparing them after fillers such as carbon black can further improve the processing performance of the rubber compound after the initial mixing of the rubber and fillers. The activators and other compounding agents are prepared after the softening and plasticizing agents. They can interact with the previously mixed materials to optimize the performance of the blended rubber. The vulcanization accelerator is prepared last because it plays a key role in promoting the vulcanization reaction. Preparing it too early may cause unnecessary reactions during the non-vulcanization stage and affect the quality of the blended rubber. Therefore, it is most appropriate to prepare it just before entering the vulcanization-related processes.

[0045] Step S2, input materials in stages for the first mixing to prepare the blended rubber A for standby.

[0046] The first mixing includes the following steps:

[0047] Step S21, first input ethylene propylene diene monomer rubber, hydrogenated nitrile butadiene rubber, compounding agent SA, and compounding agent MA-L16 into the internal mixer for the first mixing, with a mixing time of 60 - 80 s; input ethylene propylene diene monomer rubber and hydrogenated nitrile butadiene rubber into the internal mixer at a mass ratio of 2:3 - 4:1. The performance characteristics of these two rubbers are different. Through the initial mixing, the molecular chains of the two rubbers can be intertwined, laying a good dispersion foundation for adding other compounding agents later. After the compounding agent SA and the compounding agent MA-L16 are input, the activator can lower the activation energy of the vulcanization reaction, improve the vulcanization efficiency, and fully contact the rubber matrix mixed previously, making the subsequent vulcanization reaction smoother.

[0048] Step S22, input compounding agent ZNOA into the internal mixer, which helps to improve the processing performance of the rubber compound, such as increasing fluidity, reducing viscosity, etc., making it easier to disperse evenly in the internal mixer and improving the overall mixing effect.

[0049] Continue to put silica VN3, carbon black N550, calcium carbonate and naphthenic oil N10 into the internal mixer for the second mixing until the mixing temperature reaches 140 - 155 °C, and maintain the mixing time for 60 - 80 s. Reinforcing fillers are the key to improving the mechanical properties of the mixed rubber. When added at this time, they can be better dispersed in the rubber, activator and processing aid system that has been preliminarily mixed evenly, and fully combined with rubber molecules to play a reinforcing role. The addition of softening plasticizers can further improve the plasticity and flexibility of the rubber compound, reduce the viscosity of the rubber compound, make the whole system more uniform, and facilitate subsequent mixing operations.

[0050] After the mixing temperature reaches 140 - 155 °C, maintain the mixing time for 60 - 80 s. This temperature condition is conducive to promoting the physical and chemical interactions between rubber molecules and various compounding agents, accelerating the mixing process, and making the compounding agents better dispersed in the rubber matrix.

[0051] Step S23: Put antioxidant RD and antioxidant MB into the internal mixer for the third mixing to greatly improve the high-temperature aging resistance of the rubber compound. After maintaining the mixing time for 60 - 80 s, perform upper ram cleaning; performing upper ram cleaning can remove the rubber compound adhered to parts such as the upper ram of the internal mixer, avoiding performance changes of these rubber compounds due to local overheating or long-term residence, which may affect the quality of the overall mixed rubber.

[0052] Step S24: After cleaning, continue mixing to further ensure the cleanliness inside the equipment, prevent impurities from mixing in, and ensure the uniformity of the quality of the mixed rubber; finally, perform the fourth mixing. After 60 - 80 s, discharge the contact piece to prepare the mixed rubber A. Through multi-stage mixing, temperature control and cleaning operations, the mixed rubber A can achieve better mixing uniformity and preliminary performance optimization, preparing for subsequent processes.

[0053] Step S3: Perform the second mixing to ensure good mixing and dispersion, and then cut into sheets for standby. Among them, the second mixing includes the following steps:

[0054] Step S31: Add sulfur S-80HE, accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80 and accelerator TMTD-75 to the mixed rubber A for the first mixing, and maintain the mixing time for 60 - 80 s. Sulfur vulcanization accelerators can significantly accelerate the vulcanization reaction rate. When added at this stage, the vulcanization accelerators can be evenly dispersed in the mixed rubber A, ensuring that the subsequent vulcanization process can proceed quickly and evenly.

[0055] Step S32: Conduct cleaning. Cleaning is also to ensure the cleanliness of the equipment and prevent inconsistent vulcanization degrees of local rubber compounds due to adhesion to the equipment wall. After cleaning, continue with the second mixing, maintaining the mixing time at 30 - 60 s. Re-mixing can further promote the full mixing of the vulcanization accelerator and mixing rubber A, and after ensuring sufficient mixing and dispersion, sheet it for standby. The mixing rubber thus produced can crosslink more stably and efficiently during vulcanization, thereby obtaining heavy-duty truck air spring rubber products with excellent performance, meeting the performance requirements such as high strength and high elasticity in actual use.

[0056] Finally, this application provides Examples 1 - 5 to verify the feasibility and superiority of this application.

[0057] The components in the low-cost and high-performance heavy-duty truck air spring rubber mixing rubber provided in Examples 1 - 5 are proportioned by mass as shown in Table 1.

[0058] Table 1

[0059]

[0060] The mixing time and the discharging temperature of mixing rubber A involved in the preparation methods provided in Examples 1 - 5 are shown in Table 2.

[0061] Table 2

[0062]

[0063] The performance parameters of the low-cost and high-performance heavy-duty truck air spring rubber mixing rubber prepared in Examples 1 - 5 are shown in Table 3.

[0064] Table 3

[0065]

[0066] In Table 3, the detection method for compression set is referred to Appendix A of TBT 2626 - 1995, and the detection method for working resistance is referred to Appendix B of TBT 2626 - 1995.

[0067] As can be seen from Table 3, when ethylene propylene diene monomer rubber (EPDM) is used in combination with hydrogenated nitrile butadiene rubber (HNBR), it has excellent weather aging resistance, high temperature resistance, low temperature resistance, corrosion resistance to various chemicals, ozone resistance, etc., and is inexpensive. Secondly, using carbon black as the main reinforcing agent can endow the rubber compound with good electrical resistance properties and improve the tensile strength of the vulcanized rubber. Using some other fillers can improve the viscosity of the rubber compound and increase the stiffness of the rubber compound. The samples of the four examples can all meet the use requirements of the air spring, and have excellent ozone resistance and aging resistance. On the premise of meeting the performance requirements, the optimal cost-effective formulation can be reasonably selected according to the physical property changes corresponding to the changes in the proportion of ethylene propylene diene monomer rubber and hydrogenated nitrile butadiene rubber.

[0068] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the technical field to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood as having a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as here.

[0069] The meaning of "and / or" described in this application refers to the situation where each exists alone or both exist simultaneously.

[0070] The meaning of "connection" described in this application can be a direct connection between components or an indirect connection between components through other components.

[0071] Taking the above-mentioned ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A low-cost, high-performance heavy-duty truck air spring rubber compound, characterized by: Its components include EPDM rubber, hydrogenated nitrile rubber, carbon black combination, calcium carbonate, cyclohexane oil, antioxidant combination, vulcanizing agent, accelerator combination and compounding agent combination, wherein the carbon black combination includes white carbon black VN3 and carbon black N550, the cyclohexane oil is of grade N10, the antioxidant combination includes antioxidant RD and antioxidant MB, the vulcanizing agent is sulfur S-80HE, the accelerator combination includes accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80 and accelerator TMTD-75, and the compounding agent combination includes compounding agent SA, compounding agent ZNOA and compounding agent MA-L16.

2. The low-cost, high-performance heavy-duty truck air spring rubber compound according to claim 1, characterized in that: In terms of mass parts, the components include: 40-80 parts of EPDM rubber, 20-60 parts of hydrogenated nitrile rubber, 20 parts of white carbon black VN3, 60 parts of carbon black N550, 10 parts of calcium carbonate, 20 parts of cyclohexane oil N10, 1.5 parts of antioxidant RD, 1.5 parts of antioxidant MB, 2.5 parts of sulfur S-80HE, 6 parts of accelerator combination, and 12 parts of compounding agent combination.

3. The low-cost, high-performance heavy-duty truck air spring rubber compound according to claim 1, characterized in that: In the accelerator combination, the accelerator ZDTP-50 is 1.2 parts, the accelerator ZDEC-70 is 1.2 parts, the accelerator ZBEC-70 is 1.2 parts, the accelerator CBS-80 is 1.2 parts, and the accelerator TMTD-75 is 1.2 parts.

4. The low-cost, high-performance heavy-duty truck air spring rubber compound according to claim 1, characterized in that: The brand of the EPDM rubber is EP3092PM or EP3112PM or Keltan2470C or Keltan2470C.

5. The low-cost, high-performance heavy-duty truck air spring rubber compound according to claim 1, characterized in that: The brand of the hydrogenated nitrile rubber is HNBR4367, HNBR1010, HNBR4307 or HNBR3605.

6. The method for preparing a low-cost, high-performance heavy-duty truck air spring rubber compound according to any one of claims 1 to 5, characterized in that: The specific steps include: Step S1, preparing materials, first preparing two basic rubbers, namely EPDM rubber and hydrogenated nitrile rubber, then preparing white carbon black VN3, carbon black N550 and calcium carbonate, continuing to prepare naphthenic oil N10, then preparing compounding agent SA, compounding agent ZNOA and compounding agent MA-L16, continuing to prepare antioxidant RD and antioxidant MB, and finally preparing sulfur S-80HE, accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80 and accelerator TMTD-75; Step S2, adding materials in stages for first mixing to prepare a rubber compound A for standby use, wherein the first mixing includes four mixings; Step S3, performing a second mixing process to ensure mixing, dispersion and separation before discharging the pieces for later use, wherein the second mixing process includes two mixing processes.

7. The method for preparing the low-cost, high-performance heavy-duty truck air spring rubber compound according to claim 6, characterized in that: In step S2, EPDM rubber and hydrogenated nitrile rubber are put into an internal mixer at a mass ratio of 2:3-4:

1.

8. The method for preparing the low-cost, high-performance heavy-duty truck air spring rubber compound according to claim 6, characterized in that: In step S2, the first mixing step includes the following steps: Step S21, putting EPDM rubber, hydrogenated nitrile rubber, compounding agent SA and compounding agent MA-L16 into an internal mixer for first mixing, with a mixing time of 60-80 seconds; Step S22, adding the compounding agent ZNOA into the internal mixer, and continuing to add the white carbon black VN3, carbon black N550, calcium carbonate and naphthenic oil N10 into the internal mixer for a second mixing, until the mixing temperature reaches 140-155° C., and the mixing time is maintained for 60-80 seconds; Step S23, adding antioxidant RD and antioxidant MB into the internal mixer for the third mixing, maintaining the mixing time for 60-80 seconds and then cleaning the top bolt; Step S24, after cleaning, continue the fourth mixing, which lasts for 60-80 seconds before unloading the material to form the mixed rubber A for standby use.

9. The method for preparing the low-cost, high-performance heavy-duty truck air spring rubber compound according to claim 8, characterized in that: In step S3, the second mixing step includes the following steps: Step S31, adding sulfur S-80HE, accelerator ZDTP-50, accelerator ZDEC-70, accelerator ZBEC-70, accelerator CBS-80 and accelerator TMTD-75 to the rubber mix A, performing the first mixing, and maintaining the mixing time for 60-80 seconds; Step S32, cleaning is performed, and then the second mixing is continued after cleaning, and the mixing time is maintained for 30-60s. After the mixing and dispersion are sufficient, the sheet is removed for standby use.

Images