Vehicle vibration absorber, rubber composite material for vehicle vibration absorber and preparation method of rubber composite material

Abstract

The invention relates to the technical field of preparation of vehicle parts, and provides a vehicle vibration absorber, a rubber composite material for the vehicle vibration absorber and a preparation method of the rubber composite material. The rubber composite material for the vehicle vibration absorber comprises the following raw materials: a poly-alpha olefin and polynorbornene rubber blending modified polymer, isoprene rubber, diatomite, carbon black, white carbon black, zinc oxide, stearic acid, a vulcanizing agent and an accelerant. The rubber composite material for the vehicle vibration absorber has higher fatigue durability, low temperature resistance and low rubber odor, and the seat vibration absorber made of the rubber composite material has a wider action temperature range and low rubber odor and can provide a comfortable riding environment for drivers and passengers.

Description

Technical Field

[0001] This application relates to the field of vehicle component manufacturing technology, and in particular to a vehicle vibration absorber, a rubber composite material for the same, and a method for preparing the same material. Background Technology

[0002] To improve vehicle comfort, numerous vibration absorbers are used in vehicles. Taking vibration absorbers used in vehicle seats as an example, the rubber materials currently used in seat vibration absorbers are mostly styrene-butadiene rubber mixed with other rubber compounds. In order to reduce hardness to meet product requirements, a large amount of plasticizer needs to be added. However, the addition of a large amount of plasticizer will lead to a decrease in rubber strength and fatigue durability. In addition, the existing rubber materials used in seat vibration absorbers also have the problem of increased hardness at low temperatures, which leads to an increase in natural frequency, thereby greatly reducing the effectiveness of the vibration absorber.

[0003] Therefore, researching a rubber composite material for vehicle vibration absorbers that is fatigue-resistant, has low-temperature resistance, and low rubber odor has broad market prospects. Summary of the Invention

[0004] In view of this, this application aims to provide a rubber composite material for vehicle vibration absorbers, which can provide a vibration absorber rubber material with fatigue durability, low temperature resistance and low rubber odor.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A rubber composite material for vehicle vibration absorbers, wherein the raw materials of the rubber composite material for vehicle vibration absorbers include a blend of polyalphaolefin and polynorbornene rubber modified polymer, isoprene rubber, diatomaceous earth, carbon black, silica, zinc oxide, stearic acid, vulcanizing agent and accelerator.

[0006] Furthermore, the raw materials of the rubber composite material for the vehicle vibration absorber include, by weight, 80-150 parts of a polymer modified by blending polyalphaolefin and polynorbornene rubber, 40-60 parts of isoprene rubber, 20-60 parts of diatomaceous earth, 20-50 parts of carbon black, 10-30 parts of silica, 3-10 parts of zinc oxide, 0.5-3 parts of stearic acid, 0.5-3.0 parts of vulcanizing agent, and 1.2-2.5 parts of accelerator.

[0007] Furthermore, the carbon black is one or more of the following carbon black grades: N330, N550, N660, and N774.

[0008] Furthermore, the nitrogen adsorption specific surface area of ​​the precipitated silica is between 100 m² / g and 230 m² / g.

[0009] Furthermore, the accelerator includes sulfenamide accelerators and thiazole accelerators.

[0010] Compared with the prior art, this application has the following advantages: This application utilizes a blend of polyalphaolefin and polynorbornene rubber to modify the polymer and isoprene rubber, thereby improving the physical and mechanical properties of the rubber material at low hardness and thus enhancing fatigue durability. Simultaneously, the blend of polyalphaolefin and polynorbornene rubber improves the low-temperature resistance of the formulation system to meet the wide temperature range requirements of the vibration absorber product. Furthermore, diatomaceous earth is added to improve the odor of the rubber material. Therefore, through the synergistic use of the above-mentioned raw materials, the rubber composite material for vehicle vibration absorbers of this application possesses fatigue durability, low-temperature resistance, and low odor properties.

[0011] This application also proposes a method for preparing the above-mentioned rubber composite material for vehicle vibration absorbers, the method comprising: Polyalphaolefin and polynorbornene rubber blend modified polymer, isoprene rubber, zinc oxide, and magnesium stearate are mixed at a first preset temperature to obtain a blend. Add carbon black, silica, and diatomaceous earth to the blend, heat to the second preset temperature to exhaust the air, continue heating to the third preset temperature, and then discharge the compound. After the rubber compound is left to stand for a first preset time, a vulcanizing agent is added and mixed at a fourth preset temperature for a second preset time to obtain the rubber composite material for vehicle vibration absorbers.

[0012] Furthermore, the preparation method of the polyalphaolefin and polynorbornene rubber blend modified polymer includes: The polynorbornene rubber is stirred and mixed at the fifth preset temperature, and then kept at a constant temperature for the third preset time when the temperature is raised to the sixth preset temperature. The poly-α-olefin was added to the polynorbornene rubber in several batches, and the mixture was continued until the temperature reached the seventh preset temperature. The rubber was then discharged to obtain the poly-α-olefin and polynorbornene rubber blended modified polymer.

[0013] Furthermore, the poly-α-olefin is a poly-α-olefin with a pour point range of -35℃ to -70℃.

[0014] Furthermore, the amount of polynorbornene rubber added to polyα-olefin is between 1:1 and 1:2 by weight.

[0015] The method for preparing rubber composite materials for vehicle vibration absorbers disclosed in this application is simple to operate, easy to implement, and can be used for industrial production.

[0016] This application also proposes a vehicle vibration absorber, which is applied in a vehicle seat and is made of a vehicle vibration absorber rubber composite material as described above. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a flowchart illustrating the preparation method of the rubber composite material for vehicle vibration absorbers described in this application. Detailed Implementation

[0018] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0020] For items where specific conditions are not specified in this application, conventional conditions or conditions recommended by the manufacturer of the equipment used shall apply. For items where the manufacturer of the reagents or instruments used is not specified, conventional products that can be purchased commercially shall be used. As for the technical means or processes involved, if specific conditions are not specified, they shall be carried out in accordance with the existing methods in the relevant field.

[0021] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] An embodiment of the first aspect of this application provides a rubber composite material for a vehicle vibration absorber, which is capable of providing a vibration absorber rubber material with fatigue durability, low temperature resistance and low rubber odor.

[0023] In the prior art, in order to improve the comfort of vehicle use, a number of vibration absorbers are used in vehicles. For example, seat vibration absorbers are installed in vehicle seats to reduce the vibration of the seats, so that drivers and passengers can have a better riding experience.

[0024] The working principle of a vibration absorber: When the external excitation frequency is close to the natural frequency of the main vibration system, the system will produce intense vibration, i.e., resonance; at this time, a vibration absorber can be used to suppress the system vibration. When a vibration absorber is attached to the controlled object, the system will exhibit anti-resonance. The vibration energy of the active system is transferred to the dynamic vibration absorber, and the damping device on the vibration absorber consumes the vibration energy, thereby suppressing the vibration response of the main system.

[0025] Currently, vibration absorbers can be classified into damped and undamped vibration absorbers based on whether they have damping. When an undamped vibration absorber is added to the main vibration system, the amplitude of the main vibration system is greatly reduced at the resonant frequency. However, two new resonant frequencies will appear on both sides of the original system's resonant frequency. When the external excitation frequency approaches either of these two resonant frequencies, the system will resonate, causing the system to generate excessive amplitude, thus endangering the system's usability. However, when a damped vibration absorber is added, this problem can be solved well. By increasing the damping, the amplitude caused when the system passes the first resonance point will be greatly reduced.

[0026] Taking a seat vibration absorber as an example, its structure generally includes a mass block, elastic elements, and damping elements. Rubber material, a viscoelastic, is a major component of both the elastic and damping elements. Currently, the rubber material used in seat vibration absorbers is mostly styrene-butadiene rubber blended with other rubber compounds. The base hardness of styrene-butadiene rubber is 40-42 HA. When the natural frequency of the seat vibration absorber is low, the rubber hardness needs to be reduced to meet product requirements. This necessitates a large amount of plasticizer filling to achieve the required hardness. However, excessive plasticizer filling leads to a decrease in rubber strength and fatigue durability. Furthermore, the rubber materials used in current seat vibration absorbers also exhibit increased hardness at low temperatures, leading to an increase in their natural frequency, which can significantly reduce the effectiveness of the vibration absorber.

[0027] Meanwhile, the vibration absorber is installed in the passenger compartment and is an interior component. If the vibration absorber has a strong odor, it will seriously affect the riding experience of the passengers. However, the small rubber molecules in the existing vibration absorber rubber material are volatile, which will increase the odor in the passenger compartment and thus bring an unpleasant experience to the passengers.

[0028] In view of this, in order to overcome the shortcomings of the prior art, the rubber composite material for the vehicle vibration absorber of this embodiment, in terms of overall design, includes raw materials such as polyalphaolefin and polynorbornene rubber blended modified polymer, isoprene rubber, diatomaceous earth, carbon black, silica, zinc oxide, stearic acid, vulcanizing agent and accelerator.

[0029] The polymer modified by blending polyalphaolefin and polynorbornene rubber is prepared by modifying polynorbornene rubber with polyalphaolefin (PAO).

[0030] Specifically, polynorbornene rubber is obtained by ring-opening polymerization of norbornene. The polymer has a molecular weight of approximately 3,000,000 (g / mol), about 30 times that of commonly used nitrile butadiene rubber (NBR). It has a glass transition temperature of approximately 37°C and is non-polar. Due to its glass transition temperature of 37°C, a large amount of plasticizer needs to be added to lower its glass transition temperature and achieve its elastomer properties at room temperature. The selection of plasticizers must consider their impact on improving low-temperature performance, with pour point being a key parameter. The effect of adding a large amount of plasticizer on the vulcanization characteristics of the rubber also needs to be considered.

[0031] Polyalphaolefins (PAOs) are synthetic alkanes obtained through polymerization reactions of alpha-olefin monomers (such as 1-butene, 1-octene, etc.). Their molecular structures are long-chain linear or branched alkanes with a highly regular molecular arrangement; their structural formula is CH2—CH3—CH—[CH2—CH]. n - ²—CH2—CH2 (n is 3~5, R is C m H 2m + ¹, m is 6~12), its core characteristics are high and low temperature resistance, low tilt (down to -45℃); at the same time, it has high chemical inertness and does not affect the vulcanization characteristics of rubber when filled in large quantities.

[0032] Therefore, in this embodiment, a low-hardness, wide-temperature-range rubber composite material is prepared by filling poly-α-olefin (PAO) modified polynorbornene rubber.

[0033] Furthermore, isoprene rubber, one of the aforementioned raw materials, possesses a chemical structure similar to natural rubber and exhibits excellent elasticity and abrasion resistance. It is widely used in the preparation of composite rubber materials and can be compounded with other polymers, fillers, or functional materials to optimize the overall performance of the material and meet the needs of different applications. In this embodiment, it is blended with other components to optimize material properties.

[0034] Diatomaceous earth, a raw material, is a biogenic siliceous sedimentary rock formed by long-term geological processes from the siliceous remains of ancient diatoms and other microorganisms. Its main component is silicon dioxide (SiO2), typically comprising 75%–90%, with the remainder being alumina (Al2O3), iron oxides (Fe2O3), and small amounts of clay minerals or organic matter. Diatomaceous earth is porous, low in density (1.9–2.35 g / cm³), has high adsorption capacity, and low thermal conductivity. Its porosity reaches 90%, and its surface is covered with micron-sized pores, forming a "molecular sieve" structure, giving it strong adsorption and permeability. It can adsorb volatile small molecules in rubber, thus reducing odor. In this embodiment, it is used to improve the odor of rubber composite materials.

[0035] The preferred carbon black used in raw materials can be, for example, general-purpose furnace black, whose main component is carbon. It possesses excellent rubber-reinforcing, coloring, electrical conductivity, antistatic properties, and UV absorption capabilities. Because rubber itself has relatively weak mechanical properties, its tensile strength, abrasion resistance, and tear strength are insufficient after simple vulcanization. Carbon black can significantly improve these properties through its interaction with rubber molecules, which is its core function. Simultaneously, carbon black can also regulate the physical properties of rubber in the preparation of rubber materials. By adjusting the amount of carbon black added, the hardness and elasticity balance of the rubber material can be adjusted, thereby increasing the stress at a given elongation.

[0036] In addition, carbon black can improve processing performance. During rubber compounding, carbon black acts as a "dispersion medium," helping other additives (such as vulcanizing agents and accelerators) to disperse evenly and reducing performance defects caused by excessively high local concentrations. Low-structure carbon black particles aggregate more densely, resulting in lower Mooney viscosity and better flowability in the filled rubber compound, making it suitable for molding complex shapes (such as precision seals). High-structure carbon black, on the other hand, increases the viscosity of the compound, requiring processing aids to adjust its flowability. Rubber without carbon black tends to stick to the mixing mill rollers during compounding; the addition of carbon black reduces the rubber's stickiness, making the compounding process smoother.

[0037] In this embodiment, the carbon black preferably used is one or more of the following: N330, N550, N660, and N774.

[0038] The preferred raw material for silica is precipitated silica, which is an important reinforcing filler in rubber preparation. Its main functions are to improve the mechanical properties of rubber products, improve processing technology, and meet specific functional requirements.

[0039] Rubber itself has relatively low strength, and unreinforced rubber products are difficult to meet practical application requirements. Silica, with its large specific surface area and high surface activity, can form strong interactions (such as physical adsorption and chemical bonding) with rubber molecular chains, constructing an effective network structure within the rubber. This significantly improves various mechanical properties of rubber, such as tensile strength, tear strength, abrasion resistance, and tensile stress. Simultaneously, silica also influences the vulcanization process of rubber, regulating the vulcanization rate to ensure more uniform and complete vulcanization, and reducing vulcanization defects.

[0040] In this embodiment, the preferred silica is silica with a nitrogen adsorption specific surface area between 100 m² / g and 230 m² / g.

[0041] Zinc oxide, a raw material, is an important inorganic compound and an indispensable key additive in the preparation of rubber materials. Its role is involved in rubber vulcanization, performance optimization, and processing.

[0042] Specifically, zinc oxide can be used as a vulcanization activator in rubber material preparation, accelerating the vulcanization reaction and improving efficiency. As a "catalyst" in the vulcanization system, zinc oxide can react with stearic acid in the rubber formulation to form zinc soap (such as zinc stearate), significantly increasing the activity of vulcanization accelerators (such as sulfur and thiazoles), thereby shortening vulcanization time, reducing production energy consumption, reducing the amount of accelerator used, lowering costs, and ensuring a more complete vulcanization reaction, avoiding insufficient rubber performance caused by "under-vulcanization".

[0043] In addition, the addition of zinc oxide can improve the mechanical properties, corrosion resistance, stability, and aging resistance of rubber. It can also be used as a white colorant for rubber products.

[0044] During rubber vulcanization, stearic acid in the raw materials reacts with zinc oxide (ZnO) in the vulcanization system to form zinc stearate (a soluble zinc salt). Zinc stearate acts as a "bridge" in the vulcanization reaction, activating vulcanization accelerators (such as thiazoles and sulfenamides) and accelerating the decomposition and cross-linking reactions of vulcanizing agents (such as sulfur), thereby shortening vulcanization time, lowering vulcanization temperature, and improving production efficiency.

[0045] Meanwhile, stearic acid has a certain degree of fat solubility and a slippery feel. During rubber compounding (such as internal mixing and open milling), it can reduce friction between rubber molecular chains and adhesion between rubber and equipment (such as mixing mill rollers and molds), improving the flowability and plasticity of the rubber compound, making the mixing more uniform, and reducing energy consumption. Stearic acid can also penetrate between rubber molecular chains, weakening intermolecular forces (such as van der Waals forces), making rubber chain segments easier to move, thereby reducing the hardness and viscosity of the rubber compound and enhancing its softness and processability.

[0046] Furthermore, stearic acid can help fillers (such as carbon black, silica, and calcium carbonate) and additives (such as antioxidants and colorants) to disperse uniformly in the rubber matrix. The principle is that the polar carboxyl groups (-COOH) of stearic acid can combine with polar groups (such as hydroxyl groups) on the surface of fillers, while the non-polar long-chain alkyl groups are compatible with rubber molecules, acting as a "bridge" to prevent filler agglomeration and improve the uniformity of the rubber compound.

[0047] Vulcanizing agents in raw materials are crucial additives in the preparation of rubber materials. Their core function is to transform rubber molecules from a linear structure to a three-dimensional network structure through chemical action. This process is called "vulcanization".

[0048] Uncured rubber has a linear chain structure, exhibiting high plasticity, poor elasticity, low strength, and easy swelling, making it unsuitable for direct use as a practical material. The role of a vulcanizing agent is to break the unsaturated bonds (such as double bonds) in the rubber molecular chain or introduce cross-linking points through chemical reactions, allowing the linear molecules to connect and form a stable three-dimensional network structure. This significantly improves the physical properties, chemical stability, and performance of rubber, transforming it from a purely plastic material into a practically valuable elastic material.

[0049] In this embodiment, the vulcanizing agent preferably used is S-80, which is a commonly used rubber vulcanizing agent. It has good dispersibility and can be evenly dispersed in rubber, which can avoid local over-vulcanization and shorten the mixing time and reduce dust.

[0050] Accelerators in raw materials are key additives used in conjunction with vulcanizing agents in rubber materials. Their core function is to accelerate the vulcanization reaction, lower the vulcanization temperature, and shorten the vulcanization time. At the same time, they can also improve the performance of vulcanized rubber and reduce the amount of vulcanizing agent used.

[0051] In this embodiment, the accelerator preferably includes, for example, sulfenamide accelerators and thiazole accelerators. These sulfenamide and thiazole accelerators, combined with the aforementioned vulcanizing agent, form a sulfur vulcanization system. Through a chemical reaction, they activate sulfur molecules, forming an active intermediate and accelerating cross-linking. Simultaneously, the accelerator can also react with zinc oxide (ZnO) and stearic acid to generate more active complexes (such as zinc salts), significantly enhancing the accelerator's activity (for example, stearic acid can help disperse zinc oxide, enhancing its reaction efficiency with the accelerator).

[0052] Among them, sulfenamide accelerators are generated by the reaction of thiazole derivatives with amines. Representative varieties include CZ (N-cyclohexyl-2-benzothiazole sulfenamide), NOBS (N-oxodiethylene-2-benzothiazole sulfenamide), and NS (N-tert-butyl-2-benzothiazole sulfenamide). They are slow-acting, high-speed accelerators with long scorch time (good processing safety), slow vulcanization start-up but fast later speed, flat vulcanization curve, and excellent over-sulfurization stability. They need to be activated with zinc oxide and stearic acid.

[0053] Thiazole accelerators contain a thiazole ring in their molecules. Representative varieties include M (2-mercaptobenzothiazole) and DM (dibenzothiazole disulfide). They are quasi-ultra-fast accelerators with moderate vulcanization activity, relatively fast vulcanization speed, short scorch time, and generally flat vulcanization curves. They need to be used in conjunction with activators such as zinc oxide and stearic acid.

[0054] This application uses a combination of sulfenamide accelerators and thiazole accelerators to balance processing performance and final product quality.

[0055] It is worth noting that, by weight, the raw materials of the rubber composite material for the vehicle vibration absorber in this embodiment may preferably include, for example, 80-150 parts of a polymer modified by blending polyalphaolefin and polynorbornene rubber, 40-60 parts of isoprene rubber, 20-60 parts of diatomaceous earth, 20-50 parts of carbon black, 10-30 parts of silica, 3-10 parts of zinc oxide, 0.5-3 parts of stearic acid, 0.5-3.0 parts of vulcanizing agent, and 1.2-2.5 parts of accelerator.

[0056] Based on the above description of the raw materials, the rubber composite material of this embodiment exhibits higher fatigue durability, low-temperature resistance, and lower rubber odor through the synergistic effect of these raw materials. Specifically, this embodiment uses a blend of polyalphaolefin and polynorbornene rubber modified polymer with isoprene rubber, which improves the physical and mechanical properties of the rubber material at low hardness, thereby improving fatigue durability. Simultaneously, the blend of polyalphaolefin and polynorbornene rubber modified polymer improves the low-temperature resistance of the formulation system to meet the wide temperature range of the vibration absorber product. The addition of diatomaceous earth imparts strong adsorption and permeability to the rubber material, enabling it to adsorb volatile small molecules in the rubber, thus improving the odor of the rubber material. The addition of silica and carbon black balances the mixing performance and the fatigue durability of the rubber material.

[0057] The second aspect of this application provides a method for preparing a rubber composite material for a vehicle vibration absorber, the method specifically including the following steps: Step S1: Polyalphaolefin and polynorbornene rubber blend, isoprene rubber, zinc oxide, and magnesium stearate are mixed at a first preset temperature to obtain a blend.

[0058] The preparation method of the polyalphaolefin and polynorbornene rubber blend modified polymer in step S1 above, as one embodiment, may include, for example: The polynorbornene rubber is stirred and mixed at the fifth preset temperature, and then kept at a constant temperature for the third preset time when the temperature is raised to the sixth preset temperature. The polyalphaolefin was added to the polynorbornene rubber in several batches and the mixture was continued until the temperature reached the seventh preset temperature. The rubber was then discharged to obtain a polyalphaolefin and polynorbornene rubber blended polymer.

[0059] In the preparation method of the polymer modified by blending polyalphaolefin and polynorbornene rubber, the polyalphaolefin is preferably a polyalphaolefin with a pour point range of -35°C to -70°C; the amount of polynorbornene rubber added to polyalphaolefin is in the weight ratio, as a preferred embodiment, for example, between 1:1 and 1:2; the polymer modified by blending polyalphaolefin and polynorbornene rubber is preferably left to stand for more than 16 hours for later use.

[0060] Step S2: Add carbon black, silica and diatomaceous earth to the blend, heat to the second preset temperature to exhaust the air, continue to heat to the third preset temperature, and discharge the compound.

[0061] The rubber compound used in step S2 above is preferably left to stand for more than 8 hours before use.

[0062] Step S3: After the rubber compound is left to stand for a first preset time, a vulcanizing agent is added and the compound is mixed at a fourth preset temperature for a second preset time to obtain a rubber composite material for vehicle vibration absorbers.

[0063] The rubber composite material used for the vehicle vibration absorber in step S3 above is preferably designed to be parked for more than 8 hours before being put into use.

[0064] Based on the above description, the preparation method of the rubber composite material for vehicle vibration absorbers in this embodiment is simple to operate, easy to implement, and can be used for industrial production.

[0065] An embodiment of the third aspect of this application provides a vehicle vibration absorber, which is applied in a vehicle seat and is made of the aforementioned vehicle vibration absorber rubber composite material.

[0066] It is worth noting that, regarding the rubber composite material for vehicle vibration absorbers and its preparation method and product in this embodiment, based on the above preferred embodiments, the following preparation examples can be referred to in specific implementation.

[0067] Example 1 Example 1 describes the preparation of the aforementioned rubber composite material for vehicle vibration absorbers. The specific preparation steps are as follows: Raw material formulation: 100 parts of a polymer modified by blending polyalphaolefin and polynorbornene rubber (polynorbornene rubber: polyalphaolefin ratio of 1:1.5), 50 parts of isoprene rubber, 30 parts of diatomaceous earth, 30 parts of carbon black N330, 20 parts of silica, 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.8 parts of S-80, and 1.5 parts of accelerator.

[0068] Polyalphaolefin and polynorbornene rubber blending modification process: At 120℃, polynorbornene rubber was added, the rotation speed was set to 100 r / min, and the temperature was kept constant at 140℃ for 180s. Polyalphaolefin (PAO) was added in 3 batches and the mixing continued. The modified polynorbornene rubber was obtained by debinding at 150℃. The polyalphaolefin and polynorbornene rubber were blended to modify the polymer and left to stand at room temperature for 20h.

[0069] Method for preparing rubber composite materials for vehicle vibration absorbers, combined with Figure 1 As shown, the specific preparation steps of this method are as follows: Step S1: Add modified polymer, isoprene rubber, zinc oxide, stearic acid, etc. at 80℃ and mix for 60 seconds; Step S2: Add carbon black, silica, diatomaceous earth, etc., heat to 110°C, raise the top plug to vent, continue heating to 140°C, raise the top plug, open the discharge door, press down the top plug to discharge the glue, discharge the glue, close the discharge door, and let the compound stand for 10 hours for later use.

[0070] In step S3, add the compounded rubber and S-80 at 80℃, mix for 120 seconds, raise the top bolt to release air, mix for 120 seconds, raise the top bolt, open the discharge door to discharge the rubber, close the discharge door, and the rubber composite material for vehicle vibration absorbers is obtained and left to stand for 10 hours for later use.

[0071] Example 2 Example 2 describes the preparation of the aforementioned rubber composite material for vehicle vibration absorbers. The specific preparation steps are as follows: Raw material formulation: 125 parts of polyalphaolefin and polynorbornene rubber blend (polynorbornene rubber: polyalphaolefin ratio of 1:1), 55 parts of isoprene rubber, 40 parts of diatomaceous earth, 30 parts of carbon black N330, 20 parts of silica, 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.8 parts of S-80, and 1.5 parts of accelerator.

[0072] Polyalphaolefin and polynorbornene rubber blending modification process: At 125℃, polynorbornene rubber was added, the rotation speed was set to 80 r / min, and the temperature was kept constant for 180s when it reached 140℃. Polyalphaolefin (PAO) was added in 3 batches and the mixing continued. The modified polynorbornene rubber was obtained by debinding at 150℃. The polyalphaolefin and polynorbornene rubber were blended to modify the polymer and left to stand at room temperature for 24h.

[0073] Method for preparing rubber composite materials for vehicle vibration absorbers, combined with Figure 1 As shown, the specific preparation steps of this method are as follows: Step S1: Add modified polymer, isoprene rubber, zinc oxide, stearic acid, etc. at 80℃ and mix for 60 seconds; Step S2: Add carbon black, silica, diatomaceous earth, etc., heat to 110℃, raise the top plug to vent, continue to heat to 140℃, raise the top plug, open the discharge door, press down the top plug to discharge the glue, discharge the glue, close the discharge door, and let the compound stand for 12 hours for later use.

[0074] In step S3, add the compounded rubber and S-80 at 80℃, mix for 120 seconds, raise the top bolt to release air, mix for 120 seconds, raise the top bolt, open the discharge door to discharge the rubber, close the discharge door, and the rubber composite material for vehicle vibration absorbers is obtained and left to stand for 12 hours for later use.

[0075] Example 3 Example 3 describes the preparation of the aforementioned rubber composite material for vehicle vibration absorbers. The specific preparation steps are as follows: Raw material formulation: 140 parts of polyalphaolefin and polynorbornene rubber blend (polynorbornene rubber: polyalphaolefin ratio of 1:1), 40 parts of isoprene rubber, 20 parts of diatomaceous earth, 30 parts of carbon black N330, 20 parts of silica, 5 parts of zinc oxide, 1.5 parts of stearic acid, 1.8 parts of S-80, and 1.5 parts of accelerator.

[0076] Polyalphaolefin and polynorbornene rubber blending modification process: At 125℃, polynorbornene rubber was added, the rotation speed was set to 120 r / min, and the temperature was kept constant for 180s when it reached 140℃. Polyalphaolefin (PAO) was added in 3 batches and the mixing continued. The modified polynorbornene rubber was obtained by debinding at 150℃. The polyalphaolefin and polynorbornene rubber were blended to modify the polymer and left to stand at room temperature for 18h.

[0077] Method for preparing rubber composite materials for vehicle vibration absorbers, combined with Figure 1 As shown, the specific preparation steps of this method are as follows: Step S1: Add modified polymer, isoprene rubber, zinc oxide, stearic acid, etc. at 80℃ and mix for 60 seconds; Step S2: Add carbon black, silica, diatomaceous earth, etc., heat to 110°C, raise the top plug to vent, continue heating to 140°C, raise the top plug, open the discharge door, press down the top plug to discharge the glue, discharge the glue, close the discharge door, and let the compound stand for 14 hours for later use.

[0078] In step S3, add the compound rubber and S-80 at 80℃, mix for 120 seconds, raise the top bolt to release air, mix for 120 seconds, raise the top bolt, open the discharge door to discharge the rubber, close the discharge door, and the rubber composite material for vehicle vibration absorbers is obtained and left to stand for 14 hours for later use.

[0079] Comparative Example This comparative example is for the preparation of rubber composite materials. The preparation method is the same as that for the rubber composite materials used in vehicle vibration absorbers in Example 1 above. The only difference is the raw material formulation, which is as follows.

[0080] Raw material formula: 100 parts isoprene rubber, 30 parts carbon black N330, 20 parts silica, 50 parts naphthenic oil H-300, 5 parts zinc oxide, 1.5 parts stearic acid, 1.8 parts S-80, and 1.5 parts accelerator.

[0081] Seat vibration absorbers were prepared using rubber composite materials from Examples 1 to 3 and the comparative example. The fatigue durability, low-temperature resistance, and odor resistance of the rubber composite materials were verified by testing various performance parameters of the absorbers. The test results are shown in Table 1 below.

[0082] Table 1 Comparison of Vibration Absorber Performance Test Results

[0083] As shown in Table 1, compared with the vibration absorbers prepared using the comparative examples, the natural frequency of the vibration absorbers prepared using Examples 1 to 3 shows a significantly improved trend with decreasing temperature. This demonstrates that adding polyalphaolefin and polynorbornene rubber blends to the rubber material can prepare a wide-temperature-range high-damping material, giving the vibration absorber high attenuation performance. Furthermore, because the added polyalphaolefin has a very low pour point, it ensures that the vibration absorber maintains a stable natural frequency even in extremely low-temperature environments.

[0084] Furthermore, the fatigue durability of this example is approximately 600,000 fracture cycles, which is a 3-fold improvement compared to the comparative example (200,000 fracture cycles) of the modified polymer without the addition of polyalphaolefin and polynorbornene rubber. Simultaneously, the odor of this example is reduced by 0.5 grades compared to the comparative example.

[0085] Therefore, it can be seen that the rubber composite material used in the vehicle vibration absorber in this example has higher fatigue durability, low temperature resistance and low odor. Seat vibration absorbers made with it have a wider operating temperature range and can provide a more comfortable riding environment for drivers and passengers, and have broad market application prospects.

[0086] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A rubber composite material for vehicle vibration absorbers, characterized in that: The raw materials for the rubber composite material used in the vehicle vibration absorber include a blend of polyalphaolefin and polynorbornene rubber, isoprene rubber, diatomaceous earth, carbon black, silica, zinc oxide, stearic acid, vulcanizing agent, and accelerator.

2. The rubber composite material for vehicle vibration absorbers according to claim 1, characterized in that: The raw materials of the rubber composite material for the vehicle vibration absorber, by weight, include 80-150 parts of a polymer modified by blending polyalphaolefin and polynorbornene rubber, 40-60 parts of isoprene rubber, 20-60 parts of diatomaceous earth, 20-50 parts of carbon black, 10-30 parts of silica, 3-10 parts of zinc oxide, 0.5-3 parts of stearic acid, 0.5-3.0 parts of vulcanizing agent, and 1.2-2.5 parts of accelerator.

3. The rubber composite material for vehicle vibration absorbers according to claim 2, characterized in that: The carbon black used is one or more of the following: N330, N550, N660, and N774.

4. The rubber composite material for vehicle vibration absorbers according to claim 2, characterized in that: The nitrogen adsorption specific surface area of ​​the precipitated silica is between 100 m² / g and 230 m² / g.

5. The rubber composite material for vehicle vibration absorbers according to claim 2, characterized in that: The accelerators include sulfenamide accelerators and thiazole accelerators.

6. A method for preparing a rubber composite material for vehicle vibration absorbers, characterized in that, The preparation method includes: Polyalphaolefin and polynorbornene rubber blend modified polymer, isoprene rubber, zinc oxide, and magnesium stearate are mixed at a first preset temperature to obtain a blend. Add carbon black, silica, and diatomaceous earth to the blend, heat to the second preset temperature to exhaust the air, continue heating to the third preset temperature, and then discharge the compound. After the rubber compound is left to stand for a first preset time, a vulcanizing agent is added and mixed at a fourth preset temperature for a second preset time to obtain the rubber composite material for vehicle vibration absorbers.

7. The method for preparing the rubber composite material for vehicle vibration absorbers according to claim 6, characterized in that, The preparation method of the polyalphaolefin and polynorbornene rubber blend modified polymer includes: The polynorbornene rubber is stirred and mixed at the fifth preset temperature, and then kept at a constant temperature for the third preset time when the temperature is raised to the sixth preset temperature. The poly-α-olefin was added to the polynorbornene rubber in several batches, and the mixture was continued until the temperature reached the seventh preset temperature. The rubber was then discharged to obtain the poly-α-olefin and polynorbornene rubber blended modified polymer.

8. The method for preparing the rubber composite material for vehicle vibration absorbers according to claim 7, characterized in that: The poly-α-olefin used is a poly-α-olefin with a pour point range of -35℃ to -70℃.

9. The method for preparing the rubber composite material for vehicle vibration absorbers according to claim 7, characterized in that: The amount of polynorbornene rubber and polyα-olefin added is between 1:1 and 1:2 by weight.

10. A vehicle vibration absorber, characterized in that: The vehicle vibration absorber is used in a vehicle seat, and the vehicle vibration absorber is made of a rubber composite material for vehicle vibration absorbers as described in any one of claims 1 to 5.

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