Rubber with low dynamic-static ratio as well as preparation method and application thereof

Abstract

The invention discloses low-dynamic-static-ratio rubber as well as a preparation method and application thereof, and belongs to the technical field of rubber materials. The rubber comprises the following components in parts by mass: 100 parts of raw rubber, 10-30 parts of nano inorganic filler, 2-12 parts of an active agent, 2-10 parts of an anti-aging agent, 1-3 parts of protective wax, 20-50 parts of a reinforcing agent, 0-50 parts of an accelerant and 0.5-3.5 parts of a vulcanizing agent, the raw rubber comprises natural rubber and butadiene rubber. The rubber has a relatively low dynamic-static ratio, can provide relatively good vibration reduction and isolation capabilities when being applied to the field of vehicles, especially vehicle suspension, has relatively strong deformation resistance, and is beneficial to improving the comfort and stability of the vehicles.

Description

Technical Field

[0001] This application relates to the field of rubber materials technology, and in particular to a low dynamic-to-static ratio rubber, its preparation method, and its application. Background Technology

[0002] Vehicle mounts are devices used in vehicles to support and secure the powertrain. They are mainly used to fix the powertrain to the frame or body structure, while reducing the transmission of vibrations and shocks generated during powertrain operation to the vehicle body, thereby improving the vehicle's comfort and stability.

[0003] Due to its high elasticity and damping properties, rubber is often used as the main material for vehicle suspension in related technologies to absorb and dissipate the vibration energy generated during the operation of the powertrain.

[0004] However, with the development trend of vehicle powertrains towards low idle speed, high horsepower and high torque, and lightweight design, traditional rubber materials have problems such as poor low-frequency and high-frequency vibration isolation and low torsional stiffness when used in vehicle mounting. Summary of the Invention

[0005] This application provides a low dynamic-to-static ratio rubber, its preparation method, and its application to solve the technical problems existing in related technologies. Specifically, it includes the following technical solutions.

[0006] In a first aspect, this application provides a low dynamic-to-static ratio rubber, the rubber comprising the following components in parts by weight: 100 parts raw rubber, 10-30 parts nano-inorganic filler, 2-12 parts activator, 2-10 parts antioxidant, 1-3 parts protective wax, 20-50 parts reinforcing agent, 0-50 parts accelerator, and 0.5-3.5 parts vulcanizing agent; the raw rubber comprising natural rubber and butadiene rubber.

[0007] In some possible implementations, the mass ratio of the natural rubber to the butadiene rubber in the raw rubber is 7:3-9:1.

[0008] In some possible implementations, the butadiene rubber is selected from at least one of rare earth butadiene rubber, nickel-based butadiene rubber, titanium-based butadiene rubber, and cobalt-based butadiene rubber.

[0009] In some possible implementations, the initial plasticity of the natural rubber is 30 MU-50 MU, and the plasticity retention rate of the natural rubber is ≥60%.

[0010] In some possible implementations, the nano-inorganic filler is selected from at least one of nano-calcium carbonate, nano-silica, nano-titanium dioxide, and nano-clay.

[0011] In some possible implementations, the particle size of the nano-inorganic filler is 10nm-20nm.

[0012] In some possible embodiments, the activator is selected from at least one of stearic acid, zinc oxide, and zinc stearate; the protective wax is microcrystalline wax and / or rhein wax; the antioxidant is selected from at least one of N-isopropyl-N′-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 2-thiol-benzoimidazole; the reinforcing agent is selected from at least one of high abrasion-resistant carbon black, fast-extrusion carbon black, semi-reinforcing carbon black, and spray-dried carbon black; the accelerator is selected from at least one of N-cyclohexyl-2-benzothiazole sulfenamide, dibenzothiazole disulfide, tetramethylthiuram disulfide, and 4,4′-dithiodimorpholine; and the vulcanizing agent is sulfur.

[0013] Secondly, this application provides a method for preparing a low dynamic-to-static ratio rubber, the method comprising: weighing the following components in parts by weight: 100 parts raw rubber, 10-30 parts nano-inorganic filler, 2-12 parts activator, 2-10 parts antioxidant, 1-3 parts protective wax, 20-50 parts reinforcing agent, 0-50 parts accelerator, and 0.5-3.5 parts vulcanizing agent, wherein the raw rubber includes natural rubber and butadiene rubber; plasticizing the raw rubber by a plasticizing process and discharging the rubber at a first preset temperature to obtain plasticized rubber; mixing the plasticized rubber, antioxidant, activator, protective wax, reinforcing agent, and nano-inorganic filler by a mixing process and discharging the rubber at a second preset temperature to obtain mixed rubber; vulcanizing the mixed rubber, vulcanizing agent, and accelerator by a vulcanization process and discharging the rubber at a third preset temperature, and cooling to obtain the rubber.

[0014] Thirdly, this application provides a rubber structural component, which is prepared using the rubber described in any one of the first aspects of this application.

[0015] In some possible implementations, the rubber structural member is a vehicle suspension.

[0016] Fourthly, this application provides a vehicle that employs the rubber structural component described in any of the first aspects of this application.

[0017] The beneficial effects of the technical solution provided in this application include at least the following:

[0018] The low dynamic-to-static ratio rubber provided in this application, on the one hand, by using natural rubber and butadiene rubber as raw rubber, can significantly reduce the dynamic stiffness of the rubber and improve its elasticity and dynamic properties. This allows the rubber to exhibit good elasticity and dynamic response under dynamic loading (such as vibrations during the operation of the vehicle's powertrain) when applied in the vehicle field, especially when mounted on vehicle suspensions, resulting in excellent vibration reduction and isolation performance. On the other hand, by adding a specific ratio of nano-inorganic fillers and other additives, the static stiffness of the rubber can be improved. This gives the rubber stronger support capabilities when used in vehicle suspensions, and at the same time, it has a stronger ability to resist deformation when transmitting large torques, which helps maintain the stability of the vehicle structure and improves the vehicle's safety factor and comfort. Detailed Implementation

[0019] Traditional powertrain engines have relatively low power output and typically operate at medium speeds (700-800 rpm). They have high idle speeds and relatively stable torque output. As a result, they have lower requirements for absorbing and isolating low-frequency and high-frequency vibrations, as well as for torque transmission. Consequently, the rubber materials in traditional vehicle mounts usually have high dynamic stiffness and low static stiffness, thus exhibiting a high dynamic-to-static ratio (i.e., the ratio of dynamic stiffness to static stiffness).

[0020] However, as powertrains develop towards lower idle speed, higher horsepower and torque, and lighter weight, traditional high dynamic-to-static ratio rubber materials, when applied to vehicle mounts, have technical problems such as poor high / low frequency vibration isolation, difficulty in withstanding high torque transmission, and susceptibility to unwanted deformation or even damage.

[0021] To address the aforementioned technical problems, this application provides a low dynamic-to-static ratio rubber. By using natural rubber and butadiene rubber as raw rubber, adding a certain amount of nano-inorganic fillers, and other auxiliary materials, the rubber can exhibit the characteristics of a low dynamic-to-static ratio, effectively absorbing the impact generated by high / low frequency vibrations in the powertrain, and adapting to the transmission of large torques in the powertrain.

[0022] The low dynamic-to-static ratio rubber provided in this application comprises the following components in parts by weight:

[0023] The ingredients are: 100 parts raw rubber, 10-30 parts nano-inorganic filler, 2-12 parts activator, 2-10 parts antioxidant, 1-3 parts protective wax, 20-50 parts reinforcing agent, 0-50 parts accelerator, and 0.5-3.5 parts vulcanizing agent. The raw rubber includes natural rubber and butadiene rubber.

[0024] The low dynamic-to-static ratio rubber provided in this application, on the one hand, by using natural rubber and butadiene rubber as raw rubber, can significantly reduce the dynamic stiffness of the rubber and improve its elasticity and dynamic properties. This allows the rubber to exhibit good elasticity and dynamic response under dynamic loading (such as vibrations during the operation of the vehicle's powertrain) when applied in the vehicle field, especially when mounted on vehicle suspensions, resulting in excellent vibration reduction and isolation performance. On the other hand, by adding a specific ratio of nano-inorganic fillers and other additives, the static stiffness of the rubber can be improved. This gives the rubber stronger support capabilities when used in vehicle suspensions, and at the same time, it has a stronger ability to resist deformation when transmitting large torques, which helps maintain the stability of the vehicle structure and improves the vehicle's safety factor and comfort.

[0025] The following provides a further illustrative example of the content of each component in low dynamic-to-static ratio rubber.

[0026] As mentioned above, the raw rubber in low dynamic-to-static ratio rubber includes natural rubber and butadiene rubber. Natural rubber refers to natural polymer materials extracted from rubber trees, typically composed of polyisoprene, and is characterized by high elasticity, low heat generation (i.e., heat generated during dynamic deformation due to hysteresis), good fatigue resistance, and excellent adhesion to metals. Butadiene rubber refers to a structurally regular synthetic rubber polymerized from butadiene, and can be used, but is not limited to, to reduce the dynamic-to-static ratio of natural rubber. This allows the low dynamic-to-static ratio rubber provided in this application to exhibit good dynamic performance under dynamic loading, improving its vibration reduction and isolation effects.

[0027] In some embodiments, the raw rubber in the low dynamic-to-static ratio rubber comprises 100 parts by mass, and the mass ratio of natural rubber to butadiene rubber in the raw rubber of the low dynamic-to-static ratio rubber is 7:3-9:1, for example, it may include 7:3, 2.5:1, 3:1, 3.5:1, 4:1, 3.5:1, 4.5:1, 5:1, 5.5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, etc., or other values ​​within the above range. This application does not impose any limitations in this regard.

[0028] In some embodiments, the initial plasticity of natural rubber is 30 MU (Mooney units) to 50 MU, for example, it can be 30 MU, 31 MU, 32 MU, 33 MU, 34 MU, 35 MU, 36 MU, 37 MU, 38 MU, 39 MU, 40 MU, 41 MU, 42 MU, 43 MU, 44 MU, 45 MU, 46 MU, 47 MU, 48 MU, 49 MU, or 50 MU; the plasticity retention rate of natural rubber is ≥60%, for example, it can be 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, etc., or other values ​​within the above range.

[0029] The initial plasticity value of natural rubber indicates its initial plastic state when it is unprocessed, and can be used, but is not limited to, reflecting the plasticity characteristics of natural rubber when it is unprocessed. The plasticity retention rate indicates the ability of natural rubber to retain its initial plasticity after a certain period of thermal or mechanical aging, and can be used, but is not limited to, reflecting the aging resistance and oxidation resistance of natural rubber.

[0030] In some embodiments, the natural rubber is selected from at least one of standard China rubber 5 (SCR5), standard Vietnamese rubber (SCVR3), natural rubber with a constant Mooney viscosity of around 60, and smoked sheet rubber.

[0031] In some embodiments, the butadiene rubber is selected from at least one of rare earth butadiene rubber, nickel-based butadiene rubber, titanium-based butadiene rubber, and cobalt-based butadiene rubber. Rare earth butadiene rubber is used to indicate butadiene rubber polymerized using a neodymium-based catalytic system; nickel-based butadiene rubber is used to indicate butadiene rubber polymerized using a nickel-based catalytic system; titanium-based butadiene rubber is used to indicate butadiene rubber polymerized using a titanium-based catalytic system; and cobalt-based butadiene rubber is used to indicate butadiene rubber polymerized using a cobalt-based catalytic system.

[0032] For example, the nano-inorganic filler in the low dynamic-to-static ratio rubber can be used, but is not limited to, to improve the static stiffness of the low dynamic-to-static ratio rubber, so that the low dynamic-to-static ratio rubber provided in the embodiments of this application has better support performance, is not easily deformed when subjected to external force, and is beneficial to improving the stability and aging resistance of the material.

[0033] In some embodiments, the nano-inorganic filler in the low dynamic-to-static ratio rubber may be selected from at least one of nano-calcium carbonate, nano-silica, nano-titanium dioxide, and nano-clay.

[0034] In some embodiments, the mass fraction of the nano-inorganic filler in the low dynamic-to-static ratio rubber is 10 to 30 parts, for example, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 parts, or other values ​​within the above range. This application does not impose any limitations in this regard.

[0035] In some embodiments, the particle size of the nano-inorganic filler in the low dynamic-to-static ratio rubber is 10nm-20nm, for example, 10nm, 11nm, 12nm, 13nm, 14nm, 15nm, 16nm, 17nm, 18nm, 19nm, 20nm, or other values ​​within the above range.

[0036] Antioxidants can be used, but are not limited to, to improve the stability of rubber molecular structure, effectively prevent rubber from thermal oxidative aging, ozone aging, fatigue oxidation and catalytic aging by harmful metals, and extend the service life of rubber.

[0037] In some embodiments, the antioxidant may be selected from at least one of N-isopropyl-N′-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 2-thiol-benzoimidazole.

[0038] In some embodiments, the mass fraction of antioxidant in the low dynamic-to-static ratio rubber is 2 to 10 parts, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10 parts, or other values ​​within the above range.

[0039] Optionally, the mass fraction of the protective wax in the low dynamic-to-static ratio rubber is 1 to 3 parts, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, or other values ​​within the above range.

[0040] In some embodiments, the protective wax is selected from microcrystalline wax and / or rhein wax. When a certain amount of protective wax is added to the rubber to allow it to dissolve and reach a certain saturation level, the protective wax in the rubber will migrate to the surface of the rubber when the rubber is exposed to external temperatures, forming a protective film on the rubber surface. This film effectively inhibits the erosion and aging of the rubber surface by harmful factors such as light, oxygen, and ozone, prevents surface cracking, and thus extends the service life of the rubber.

[0041] In some embodiments, the mass fraction of the reinforcing agent in the low dynamic-to-static ratio rubber is 20-50 parts, for example, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 50 parts, or other values ​​within the above range.

[0042] Optionally, the reinforcing agent is selected from at least one of high abrasion-resistant carbon black, fast-extrusion carbon black, semi-reinforcing carbon black, and spray-dried carbon black. The reinforcing agent can significantly improve the dynamic-to-static ratio of rubber, enhancing its resilience and vibration transmission performance.

[0043] In some embodiments, the mass fraction of the activator in the low dynamic-to-static ratio rubber is 2 to 12 parts, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 parts, or other values ​​within the above range. This application does not impose any limitations in this regard.

[0044] For example, the activator is selected from one or more of stearic acid, zinc oxide, and zinc stearate. The activator can be used, but is not limited to, to improve the processing and vulcanization properties of raw rubber and to improve the elastic properties of rubber.

[0045] In some embodiments, the mass fraction of the vulcanizing agent in the low dynamic-to-static ratio rubber is 0.5 to 3.5 parts, for example, 0.5, 0.7, 0.9, 1.1, 1.3, 1.5, 1.7, 1.9, 2.1, 2.3, 2.5, 2.7, 2.9, 3.1, 3.3, 3.5, or other values ​​within the above range.

[0046] For example, the vulcanizing agent is sulfur. The vulcanizing agent can be used, but is not limited to, to improve the elastic properties, mechanical properties, heat resistance, and aging resistance of rubber in order to improve the quality of rubber.

[0047] In some embodiments, the mass fraction of the accelerator in the low dynamic-to-static ratio is 0-50 parts, for example, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, or other values ​​within the above range.

[0048] Optionally, the accelerator is selected from at least one of N-cyclohexyl-2-benzothiazole sulfenamide, dibenzothiazole disulfide, tetramethylthiuram disulfide, and 4,4′-dithiodimorpholine. The accelerator can be used, but is not limited to, to improve the elastic properties, mechanical properties, heat resistance, and aging resistance of rubber to improve the quality of rubber.

[0049] In some examples, the low dynamic-to-static ratio rubber mentioned above can be prepared by the following preparation methods.

[0050] Step 1: Weigh the following components in parts by mass:

[0051] The composition includes 100 parts raw rubber, 10-30 parts nano-inorganic filler, 2-12 parts activator, 2-10 parts antioxidant, 1-3 parts protective wax, 20-50 parts reinforcing agent, 0-50 parts accelerator, and 0.5-3.5 parts vulcanizing agent. The raw rubber includes natural rubber and butadiene rubber.

[0052] Step 2: The raw rubber is plasticized using a plasticizing process and discharged at a first preset temperature to obtain plasticized rubber.

[0053] In some embodiments, the first preset temperature is 95℃-125℃, such as 95℃, 96℃, 97℃, 98℃, 99℃, 100℃, 101℃, 102℃, 103℃, 104℃, 105℃, 106℃, 107℃, 108℃, 109℃, 110℃, 111℃, 112℃, 113℃, 114℃, 115℃, 116℃, 117℃, 118℃, 119℃, 120℃, 121℃, 122℃, 123℃, 124℃, 125℃, etc., or other values ​​within the above range.

[0054] In some embodiments, the plasticizing process of raw rubber is carried out in an internal mixer.

[0055] When raw rubber is plasticized using an internal mixer, the process of plasticizing raw rubber and discharging it at a first preset temperature to obtain plasticized rubber includes: turning on the cooling circulating water of the internal mixer, controlling the temperature of the internal mixer chamber to be less than 50°C, the rotor speed in the chamber to be 30-45 rpm, feeding the raw rubber into the internal mixer chamber for plasticizing, discharging the rubber after the temperature in the chamber reaches the first preset temperature, and allowing it to cool to obtain plasticized rubber.

[0056] The working chamber temperature of the internal mixer is, for example, 49℃, 48℃, 47℃, 46℃, 45℃, 44℃, 43℃, 42℃, 41℃, 40℃, 39℃, 38℃, 37℃, 36℃, 35℃, 34℃, 33℃, 32℃, 31℃, 30℃, 29℃, 28℃, 27℃, 26℃, 25℃, 24℃, 23℃, 22℃, 21℃, 20℃, etc., and the rotor temperature in the working chamber... The rotational speed may be, for example, 30 rpm, 31 rpm, 32 rpm, 33 rpm, 34 rpm, 35 rpm, 36 rpm, 37 rpm, 38 rpm, 39 rpm, 40 rpm, 41 rpm, 42 rpm, 43 rpm, 44 rpm, 45 rpm, or other values ​​within the above range. This application makes no restrictions in this regard.

[0057] Step 3: The plasticized rubber, antioxidant, activator, protective wax, reinforcing agent and nano-inorganic filler are mixed through a mixing process and discharged at a second preset temperature to obtain the mixed rubber.

[0058] In some embodiments, the second preset temperature is 110℃-120℃, such as 110℃, 111℃, 112℃, 113℃, 114℃, 115℃, 116℃, 117℃, 118℃, 119℃, 120℃, or other values ​​within the above range.

[0059] To improve the quality of rubber, when mixing plasticized rubber, antioxidants, activators, protective waxes, reinforcing agents and nano-inorganic fillers through a mixing process, multi-stage mixing can be set up to mix different raw materials in batches.

[0060] In some embodiments, the mixing process includes a multi-stage mixing process. When the mixing process is a multi-stage mixing process, the process of mixing plasticized rubber, antioxidant, activator, protective wax, reinforcing agent and nano-inorganic filler and discharging the rubber at a second preset temperature includes: performing a first-stage mixing of the plasticized rubber; after a first preset time period, adding antioxidant, activator and protective wax to the plasticized rubber after the first-stage mixing for a second-stage mixing; after a second preset time period, adding reinforcing agent and nano-inorganic filler to the mixture after the second-stage mixing; and discharging the rubber after the temperature reaches the second preset temperature to obtain the mixed rubber.

[0061] In some embodiments, the multi-stage mixing process is carried out in an internal mixer. Based on this, the process of mixing plasticized rubber, antioxidant, activator, protective wax, reinforcing agent and nano-inorganic filler and discharging the rubber at a second preset temperature includes: turning on the cooling circulating water of the internal mixer, controlling the temperature of the internal mixer chamber to be less than 50°C, the rotor speed in the chamber to be 30 rpm-45 rpm, adding plasticized rubber into the chamber, and performing a first stage of mixing. After a first preset time period, adding antioxidant, activator and protective wax into the chamber for a second stage of mixing. After a second preset time period, adding reinforcing agent and nano-inorganic filler into the chamber for a second stage of mixing. After the temperature of the chamber reaches the second preset temperature, discharging the rubber and allowing it to cool down to obtain the mixed rubber.

[0062] The first preset time period is 1min-2min, such as 1min, 1.1min, 1.2min, 1.3min, 1.4min, 1.5min, 1.6min, 1.7min, 1.8min, 1.9min, 2.0min, etc.; the second preset time period is 90s-120s, such as 90s, 91s, 92s, 93s, 94s, 94s, 96s, 97s, 98s, 99s, 100s, 101s, 102s, 103s, 104s, 105s, 106s, 107s, 108s, 109s, 110s, 111s, 112s, 113s, 114s, 115s, 116s, 117s, 118s, 119s, 120s, etc., or other values ​​within the above range.

[0063] In some embodiments, to further improve the dispersibility of various raw materials in the plasticized rubber and thus improve the quality of the rubber, a plasticizer can be added during the two-stage mixing process, and a bolt lifting operation can be performed after the chamber temperature reaches the first mixing temperature. The bolt lifting operation refers to the operation of lifting the mixture on the rotor in the internal mixer's chamber to redistribute it. The number of bolt lifting operations can be, for example, 2, 3, or 4 times, or adjusted according to the actual application; this application makes no limitation in this regard.

[0064] The plasticizer is present in parts by weight of 1 to 5 parts, for example, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, etc. This application does not impose any restrictions in this regard.

[0065] The first mixing temperature can be 90℃-100℃, such as 90℃, 91℃, 92℃, 93℃, 94℃, 95℃, 96℃, 97℃, 98℃, 99℃, 100℃, or other values ​​within the above range.

[0066] To improve the dispersibility of various raw materials in the plasticized rubber, the mixture obtained after degassing at a second preset temperature can be further mixed and dispersed. In some embodiments, during the cooling process of the mixture obtained after degassing at the second preset temperature, the mixture is transferred to a two-roll mill for a rolling operation. The rolling operation refers to the mixing operation performed by the shearing and rotation of the rollers of the two-roll mill on the mixture obtained after degassing at the second preset temperature.

[0067] Step 4: The compound rubber, vulcanizing agent and accelerator are vulcanized through a vulcanization process and discharged at a third preset temperature. After cooling, the rubber is obtained.

[0068] In some embodiments, the third preset temperature is less than 90°C, such as 90°C, 89°C, 88°C, 87°C, 86°C, 85°C, 84°C, 83°C, 82°C, 81°C, 80°C, 79°C, 78°C, 77°C, 76°C, 75°C, 74°C, 73°C, 72°C, 71°C, 70°C, etc., or other values ​​within the above range.

[0069] In some embodiments, the vulcanization treatment of the compound is carried out in a Banbury mixer. Based on this, the compound, vulcanizing agent and accelerator are vulcanized by a vulcanization process and discharged at a third preset temperature. After cooling, the process of obtaining rubber includes: feeding the cooled compound into the working chamber of the Banbury mixer, adding vulcanizing agent and accelerator to the working chamber of the Banbury mixer, vulcanizing the compound added to the working chamber, discharging the compound at a third preset temperature after a third preset time period, and obtaining the low dynamic-to-static ratio rubber provided in the embodiments of this application after cooling.

[0070] The third preset time period is 1min-3min, such as 1min, 1.2min, 1.4min, 1.6min, 1.8min, 2.0min, 2.2min, 2.4min, 2.6min, 2.8min, 3min, or other values ​​within the above range.

[0071] In some embodiments, to further improve the quality of the rubber, the mixture after degumming at a third preset temperature can be transferred to a two-roll mill and tumbled using the two-roll mill, and then allowed to stand for 15-18 hours to obtain the rubber. Tumbling refers to the operation of repeatedly turning and mixing the mixture by rotating the rollers of the two-roll mill.

[0072] In some embodiments, the settling time is, for example, 15h, 15.2h, 15.4h, 15.6h, 15.8h, 16h, 16.2h, 16.4h, 16.6h, 16.8h, 17h, 17.2h, 17.4h, 17.6h, 17.8h, 18h, or other values ​​within the above range.

[0073] In some embodiments, the vulcanization system for vulcanizing the compound added to the work chamber includes a sulfur vulcanization system, such as an effective vulcanization system or a semi-effective vulcanization system.

[0074] This application also provides a rubber structural component made of the low dynamic-to-static ratio rubber described above.

[0075] Rubber structural components can include any rubber structural component with a specific structure and size that can meet specific usage requirements, such as vehicle suspension.

[0076] When manufacturing vehicle suspension structural components, they can be directly prepared based on the components of low dynamic-to-static ratio rubber, as described above. After obtaining the compound rubber, it can be processed into the required shape and size through a molding process, and then vulcanized through a vulcanization process. After cooling, the rubber structural component is obtained. Alternatively, the low dynamic-to-static ratio rubber prepared in advance can be softened and then processed into the required shape and size through molding to obtain the rubber structural component.

[0077] The rubber structural component provided in this application uses natural rubber and butadiene rubber as raw rubber, which significantly reduces the dynamic stiffness of the rubber. At the same time, by adding a specific ratio of nano-inorganic fillers and other auxiliary materials, the static stiffness of the rubber is improved, giving the rubber a low dynamic-to-static ratio. This allows the rubber structural component to exhibit good elasticity and dynamic response under dynamic loading (such as vibration during the operation of a vehicle's powertrain), and excellent vibration reduction and isolation performance.

[0078] This application also provides a vehicle that employs the rubber structural components described above.

[0079] The vehicle provided in this application uses rubber structural components that exhibit good elasticity and dynamic response under dynamic loading (e.g., vibration of the vehicle's powertrain during operation), with excellent vibration reduction and isolation performance. When applied to vehicles, these components can provide stronger support and have a stronger ability to resist deformation when transmitting large torques, which helps maintain the stability of the vehicle structure and improves the vehicle's safety and comfort.

[0080] Exemplary embodiments of the present invention will now be described in more detail. While exemplary embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with techniques or conditions described in the literature in the art or according to product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.

[0081] Example 1

[0082] Example 1 provides a method for preparing a low dynamic-to-static ratio rubber, comprising the following steps:

[0083] Step 1: Weigh the following components in parts by mass:

[0084] SCVR 3100 parts, surfactant 7 parts, antioxidant 5 parts, protective wax 2 parts, carbon black 50 parts, N-cyclohexyl-2-benzothiazole sulfenamide 1.5 parts, 4,4′-dithiodimorpholine 1.5 parts, tetramethylthiuram disulfide 1.5 parts, plasticizer 5 parts, sulfur 3.5 parts.

[0085] Step 2: Turn on the cooling water circulation of the internal mixer, control the temperature of the internal mixer chamber to be less than 50℃, and the rotor speed in the chamber to be 30 rpm - 45 rpm. Put SCVR3 into the internal mixer chamber for plasticizing treatment. After the temperature in the chamber reaches 95℃-125℃, discharge the glue and let it cool to obtain plasticized glue.

[0086] Step 3: Turn on the cooling water circulation of the internal mixer and control the temperature of the internal mixer chamber to be less than 50℃. The rotor speed in the chamber is 30-45 rpm. Add the plasticized rubber into the chamber and mix it for one stage. After 1-2 minutes, add the antioxidant, activator, and protective wax into the chamber for the second stage of mixing. After 90-120 seconds, add carbon black into the chamber for the second stage of mixing. When the temperature of the chamber reaches 90-100℃, lift the bolt 2-4 times. When the temperature of the chamber reaches 110-120℃, discharge the rubber and transfer it to the open mill for rolling. After cooling, the compounded rubber is obtained.

[0087] Step 4: The cooled rubber compound is fed into the internal mixer chamber. Sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, 4,4′-dithiodimorpholine and tetramethylthiuram disulfide are added to the internal mixer chamber to vulcanize the rubber compound. After 1-3 minutes, the rubber is discharged at <90℃. After discharge, it is transferred to an open mill for re-mixing. After standing for 15-18 hours to cool, a low dynamic-to-static ratio rubber is obtained.

[0088] Example 2

[0089] Example 2 provides a method for preparing a low dynamic-to-static ratio rubber, comprising the following steps:

[0090] Step 1: Weigh the following components in parts by mass:

[0091] SCVR3 70 parts, rare earth cis-butadiene rubber 30 parts, activator 7 parts, antioxidant 5 parts, protective wax 2 parts, carbon black 50 parts, N-cyclohexyl-2-benzothiazole sulfenamide 1.5 parts, 4,4′-dithiodimorpholine 1.5 parts, tetramethylthiuram disulfide 1.5 parts, plasticizer 5 parts, sulfur 3.5 parts.

[0092] Step 2: Turn on the cooling water circulation of the internal mixer and control the temperature of the internal mixer chamber to be less than 50℃. The rotor speed in the chamber is 30-45 rpm. Put SCVR3 and rare earth cis-butadiene rubber into the internal mixer chamber for plasticizing treatment. After the temperature in the chamber reaches 95℃-125℃, discharge the rubber and let it cool to obtain plasticized rubber.

[0093] Step 3: Turn on the cooling water circulation of the internal mixer and control the temperature of the internal mixer chamber to be less than 50℃. The rotor speed in the chamber is 30-45 rpm. Add the plasticized rubber into the chamber and mix it for one stage. After 1-2 minutes, add the antioxidant, activator, and protective wax into the chamber for the second stage of mixing. After 90-120 seconds, add carbon black into the chamber for the second stage of mixing. When the temperature of the chamber reaches 90-100℃, lift the bolt 2-4 times. When the temperature of the chamber reaches 110-120℃, discharge the rubber and transfer it to the open mill for rolling. After cooling, the compounded rubber is obtained.

[0094] Step 4: The cooled rubber compound is fed into the internal mixer chamber. Sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, 4,4′-dithiodimorpholine and tetramethylthiuram disulfide are added to the internal mixer chamber to vulcanize the rubber compound. After 1-3 minutes, the rubber is discharged at <90℃. After discharge, it is transferred to an open mill for re-mixing. After standing for 15-18 hours to cool, a low dynamic-to-static ratio rubber is obtained.

[0095] Example 3

[0096] Example 3 provides a method for preparing a low dynamic-to-static ratio rubber, comprising the following steps:

[0097] Step 1: Weigh the following components in parts by mass:

[0098] SCVR3 70 parts, rare earth butadiene rubber 30 parts, nanomaterial filler 20 parts, activator 7 parts, antioxidant 5 parts, protective wax 2 parts, carbon black 30 parts, N-cyclohexyl-2-benzothiazole sulfenamide 1.5 parts, 4,4′-dithiodimorpholine 1.5 parts, tetramethylthiuram disulfide 1.5 parts, plasticizer 5 parts, sulfur 3.5 parts.

[0099] Step 2: Turn on the cooling water circulation of the internal mixer and control the temperature of the internal mixer chamber to be less than 50℃. The rotor speed in the chamber is 30-45 rpm. Put SCVR3 and rare earth cis-butadiene rubber into the internal mixer chamber for plasticizing treatment. After the temperature in the chamber reaches 95℃-125℃, discharge the rubber and let it cool to obtain plasticized rubber.

[0100] Step 3: Turn on the cooling water circulation of the internal mixer and control the temperature of the internal mixer chamber to be less than 50℃. The rotor speed in the chamber is 30-45 rpm. Add the plasticized rubber into the chamber and mix it for one stage. After 1-2 minutes, add the antioxidant, activator, and protective wax into the chamber for the second stage of mixing. After 90-120 seconds, add the carbon black and nano-filler into the chamber for the second stage of mixing. When the temperature of the chamber reaches 90-100℃, lift the plug 2-4 times. When the temperature of the chamber reaches 110-120℃, discharge the rubber and transfer it to the open mill for rolling. After cooling, the compounded rubber is obtained.

[0101] Step 4: The cooled rubber compound is fed into the internal mixer chamber. Sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, 4,4′-dithiodimorpholine and tetramethylthiuram disulfide are added to the internal mixer chamber to vulcanize the rubber compound. After 1-3 minutes, the rubber is discharged at <90℃. After discharge, it is transferred to an open mill for re-mixing. After standing for 15-18 hours to cool, a low dynamic-to-static ratio rubber is obtained.

[0102] Test case

[0103] 1. The low dynamic-to-static ratio rubber obtained in Examples 1-3 above was vulcanized at 155°C for 4 min, and a test piece and a hardness sample (formed by stacking 3 test pieces) with a length × width × thickness of 150 mm (±5 mm) × 150 mm (±5 mm) × 2 mm (±0.2 mm) were obtained by calendering. The physical properties of the pressed sheet and the hardness sample were tested (the test method refers to GB / T531). The test results are shown in Table 1.

[0104] 2. The low dynamic-to-static ratio rubbers obtained in Examples 1-3 above were vulcanized at 155°C for 15 min to obtain a compression deformation sample with a diameter × height of 29 mm (±0.5 mm) × 12.5 mm (±0.5 mm). The compression deformation properties (compression permanent deformation rate) of the compression deformation sample were tested (test method refers to GB / T 7759). The test results are shown in Table 1.

[0105] Table 1

[0106]

[0107]

[0108] As shown in Table 1 and Examples 1-3, nano-inorganic fillers can effectively reduce the dynamic-to-static ratio of rubber while ensuring its mechanical properties. The rubber provided in this application, by using natural rubber and butadiene rubber as the raw material, and adding nano-inorganic fillers and other raw materials, exhibits a low dynamic-to-static ratio. When applied in the vehicle field, especially in vehicle suspension, it provides excellent vibration damping and isolation effects, and demonstrates stronger resistance to deformation when transmitting large torques. Furthermore, the rubber provided in this application also exhibits excellent physical properties such as hardness, tensile strength variation rate, and elongation at break, which helps maintain the stability of the vehicle structure and improves vehicle safety and comfort.

[0109] The above description is only for the purpose of enabling those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A low dynamic-to-static ratio rubber, characterized in that, The rubber comprises the following components in parts by weight: 100 parts raw rubber, 10-30 parts nano-inorganic filler, 2-12 parts activator, 2-10 parts antioxidant, 1-3 parts protective wax, 20-50 parts reinforcing agent, 0-50 parts accelerator, 0.5-3.5 parts vulcanizing agent; The raw rubber includes natural rubber and butadiene rubber.

2. The rubber according to claim 1, characterized in that, The mass ratio of the natural rubber to the butadiene rubber is 7:3-9:

1.

3. The rubber according to claim 1, characterized in that, The butadiene rubber is selected from at least one of rare earth butadiene rubber, nickel-based butadiene rubber, titanium-based butadiene rubber, and cobalt-based butadiene rubber.

4. The rubber according to claim 1, characterized in that, The initial plasticity of the natural rubber is 30MU-50MU, and the plasticity retention rate of the natural rubber is ≥60%.

5. The rubber according to claim 1, characterized in that, The nano-inorganic filler is selected from at least one of nano-calcium carbonate, nano-silica, nano-titanium dioxide, and nano-clay; Preferably, the particle size of the nano-inorganic filler is 10nm-20nm.

6. The rubber according to any one of claims 1-5, characterized in that, The activator is selected from at least one of stearic acid, zinc oxide, and zinc stearate; The protective wax is microcrystalline wax and / or rhein wax; The antioxidant is selected from at least one of N-isopropyl-N′-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, and 2-thiol-benzoimidazole; The reinforcing agent is selected from at least one of high abrasion-resistant carbon black, fast extrusion carbon black, semi-reinforcing carbon black, and spray-dried carbon black. The accelerator is selected from at least one of N-cyclohexyl-2-benzothiazole sulfenamide, dibenzothiazole disulfide, tetramethylthiuram disulfide and 4,4′-dithiodimorpholine; The vulcanizing agent is sulfur.

7. A method for preparing a low dynamic-to-static ratio rubber, characterized in that, The method includes: Weigh out the following components in parts by mass: The mixture comprises 100 parts raw rubber, 10-30 parts nano-inorganic filler, 2-12 parts activator, 2-10 parts antioxidant, 1-3 parts protective wax, 20-50 parts reinforcing agent, 0-50 parts accelerator, and 0.5-3.5 parts vulcanizing agent, wherein the raw rubber includes natural rubber and butadiene rubber; The raw rubber is plasticized by a plasticizing process and discharged at a first preset temperature to obtain plasticized rubber; The plasticized rubber, the antioxidant, the activator, the protective wax, the reinforcing agent, and the nano-inorganic filler are mixed through a mixing process and then discharged at a second preset temperature to obtain a mixed rubber. The compound rubber, the vulcanizing agent, and the accelerator are vulcanized through a vulcanization process, and the rubber is discharged at a third preset temperature and then cooled to obtain the rubber.

8. A rubber structural component, characterized in that, The rubber structural component is prepared using the rubber described in any one of claims 1-6.

9. The rubber structural component according to claim 8, characterized in that, The rubber structural component is used for vehicle suspension.

10. A vehicle, characterized in that, The vehicle includes the rubber structural component as described in any one of claims 8 or 9.

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