Low-noise natural rubber material for automobile stabilizer bar bushing and preparation method of low-noise natural rubber material

Abstract

The invention discloses a low-noise natural rubber material for an automobile stabilizer bar bushing, which comprises the following components in parts by mass: 100 parts of natural rubber, 2-7 parts of carbon nanotubes, 15-30 parts of carbon black N339, 20-30 parts of carbon black N550, 5-8 parts of zinc oxide, 1-3 parts of stearic acid, 0-10 parts of alkane oil, 3-8 parts of an ester plasticizer, 3-8 parts of a self-lubricating agent, 2-5 parts of microcrystalline wax, 1-3 parts of an anti-aging agent RD, 1-3 parts of an anti-aging agent 4010NA and 1.5-3 parts of sulfur. 1-2 parts of an accelerant CZ, 0-0.5 part of an accelerant TT and 0-0.5 part of a scorch retarder CTP. The material has the advantages of low friction coefficient (less than or equal to 0.4), high wear resistance, excellent mechanical property and aging resistance, is suitable for automobile stabilizer bar bushings, and can effectively reduce operation noise.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a rubber composition, particularly a low-noise, high-wear-resistant natural rubber material for stabilizer bar bushings in automotive suspension systems and its preparation method. Background Technology

[0002] Ethylene propylene diene monomer (EPDM) rubber, due to its main chain being composed of stable saturated hydrocarbons, possesses excellent weather resistance, ozone aging resistance, and heat aging resistance, and is widely used in automotive sealing strips, radiator hoses, and other components. However, due to its non-polar molecular structure, EPDM exhibits extremely poor resistance to non-polar oils (such as gasoline and engine oil), easily swelling and deforming upon contact, leading to product failure.

[0003] To improve the oil resistance of EPDM, it is common practice in the field to use it in combination with polar rubbers such as nitrile rubber (NBR). However, EPDM and NBR have poor compatibility, and their vulcanization characteristics (unsaturation and polarity) are different. It is difficult to achieve good co-vulcanization using traditional sulfur vulcanization systems, which leads to a significant decrease in the physical and mechanical properties of the blend and limited improvement in oil resistance.

[0004] Therefore, developing an EPDM rubber material that can significantly improve oil resistance while maintaining the inherent advantages and overall mechanical properties of EPDM has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to overcome the aforementioned deficiencies of the prior art and provide a low-noise natural rubber material for automotive stabilizer bar bushings. This material, through a unique component design and synergistic effect, achieves a balance of high strength, high elasticity, low coefficient of friction, and excellent durability, effectively eliminating abnormal noise during stabilizer bar operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-noise natural rubber material for automotive stabilizer bar bushings, comprising the following components by weight:

[0007] 100 parts natural rubber

[0008] 2–7 parts carbon nanotubes

[0009] Carbon black N339 15–30 parts,

[0010] Carbon black N550 20–30 parts,

[0011] 5–8 parts zinc oxide

[0012] 1–3 parts stearic acid

[0013] 0–10 parts of alkane oil,

[0014] 3–8 parts of ester plasticizer,

[0015] 3–8 parts self-lubricating agent

[0016] 2-5 parts of microcrystalline wax

[0017] Anti-aging agent RD 1–3 parts,

[0018] Anti-aging agent 4010NA 1–3 parts,

[0019] Sulfur 1.5–3 parts,

[0020] Accelerator CZ 1–2 parts,

[0021] Accelerator TT 0–0.5 parts,

[0022] 0–0.5 parts of anti-scorching agent CTP.

[0023] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 2 parts carbon nanotubes, 30 parts carbon black N339, 20 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 8 parts ester plasticizer, 3 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0024] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 2.5 parts carbon nanotubes, 28 parts carbon black N339, 25 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 6 parts ester plasticizer, 5 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0025] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 3 parts carbon nanotubes, 25 parts carbon black N339, 27 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 5 parts ester plasticizer, 6 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0026] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 4 parts carbon nanotubes, 20 parts carbon black N339, 30 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 4 parts ester plasticizer, 8 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0027] Furthermore, the natural rubber is one of SVR3L, SVRCV60, or SCR5.

[0028] Furthermore, the ester plasticizer is one or more combinations of DOA, DOS, and TP-95.

[0029] Furthermore, the self-lubricant is one or more combinations of oleamide, erucamide, and triethanolamine.

[0030] Furthermore, its composition also includes 3-7 parts by weight of bio-based fiber.

[0031] The present invention also provides a method for preparing a low-noise natural rubber material for automotive stabilizer bar bushings according to any of the above-described methods, comprising the following steps:

[0032] a) First stage of plasticizing: After plasticizing the natural rubber, it is left to stand for later use;

[0033] b) First stage of mixing: Mix natural rubber, zinc oxide, stearic acid, antioxidant and microcrystalline wax for 60-90 seconds, then add carbon nanotubes, carbon black, self-lubricant, alkane oil and plasticizer, and mix to form sheets;

[0034] c) Second stage of mixing: Add sulfur, accelerator and anti-scorching agent, mix evenly and then discharge the glue.

[0035] The beneficial effects of this invention are as follows:

[0036] 1. Innovative Filler System: A blend of carbon nanotubes and two different particle sizes of carbon black (N339 and N550). Carbon black N339, with its small particle size and high structure, primarily provides excellent wear resistance and reinforcement. Carbon black N550, with its larger particle size, offers good elasticity and dynamic properties. Carbon nanotubes, with their extremely high aspect ratio, form a three-dimensional thermally conductive and reinforcing network within the rubber matrix, significantly improving the material's tear resistance, wear resistance, and thermal conductivity, preventing thermal aging caused by heat accumulation, and extending product lifespan. The synergistic effect of these three components achieves an optimal balance of strength, elasticity, and durability.

[0037] 2. Dual Long-Lasting Lubrication Mechanism: Innovatively, it simultaneously utilizes ester plasticizers and self-lubricants. Ester plasticizers have limited compatibility with rubber and migrate relatively quickly to the product surface, forming an initial lubricating layer and providing immediate noise reduction. Self-lubricants (such as amides) bond more firmly to rubber, migrate more slowly, and continue to seep out after the ester plasticizers are gradually consumed, providing long-term, stable lubrication. This maintains a low coefficient of dynamic friction (≤0.4) throughout the entire product lifecycle, fundamentally eliminating abnormal noise.

[0038] 3. Excellent comprehensive performance: Through the precise design of the above components and dosages, the material of this invention ultimately exhibits the following outstanding properties:

[0039] Stiffness (Shore A): 55±3, providing moderate support stiffness and comfort;

[0040] Tensile strength: ≥20MPa, excellent mechanical properties;

[0041] Elongation at break: ≥400%, good toughness;

[0042] Ozone resistance (50pphm, 40℃, 72h): No cracking, excellent aging resistance;

[0043] The coefficient of dynamic friction is ≤0.4, which is much lower than that of ordinary rubber bushings, resulting in a significant noise reduction effect.

[0044] The material of this invention is particularly suitable for manufacturing high-performance, low-noise automotive stabilizer bar bushings, which improves the overall NVH level and ride quality of the vehicle and has extremely high market application value. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] A low-noise natural rubber material for automotive stabilizer bar bushings comprises the following components by weight:

[0047] 100 parts natural rubber

[0048] 2–7 parts carbon nanotubes

[0049] Carbon black N339 15–30 parts,

[0050] Carbon black N550 20–30 parts,

[0051] 5–8 parts zinc oxide

[0052] 1–3 parts stearic acid

[0053] 0–10 parts of alkane oil,

[0054] 3–8 parts of ester plasticizer,

[0055] 3–8 parts self-lubricating agent

[0056] 2-5 parts of microcrystalline wax

[0057] Anti-aging agent RD 1–3 parts,

[0058] Anti-aging agent 4010NA 1–3 parts,

[0059] Sulfur 1.5–3 parts,

[0060] Accelerator CZ 1–2 parts,

[0061] Accelerator TT 0–0.5 parts,

[0062] 0–0.5 parts of anti-scorching agent CTP.

[0063] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 2 parts carbon nanotubes, 30 parts carbon black N339, 20 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 8 parts ester plasticizer, 3 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0064] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 2.5 parts carbon nanotubes, 28 parts carbon black N339, 25 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 6 parts ester plasticizer, 5 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0065] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 3 parts carbon nanotubes, 25 parts carbon black N339, 27 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 5 parts ester plasticizer, 6 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0066] Furthermore, the preferred composition ratio is as follows: 100 parts natural rubber, 4 parts carbon nanotubes, 20 parts carbon black N339, 30 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 4 parts ester plasticizer, 8 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

[0067] Furthermore, the natural rubber is one of SVR3L, SVRCV60, or SCR5.

[0068] Furthermore, the ester plasticizer is one or more combinations of DOA, DOS, and TP-95.

[0069] Furthermore, the self-lubricant is one or more combinations of oleamide, erucamide, and triethanolamine.

[0070] The present invention also provides a method for preparing a low-noise natural rubber material for automotive stabilizer bar bushings according to any of the above-described methods, comprising the following steps:

[0071] a) First stage of plasticizing: After plasticizing the natural rubber, it is left to stand for later use;

[0072] b) First stage of mixing: Mix natural rubber, zinc oxide, stearic acid, antioxidant and microcrystalline wax for 60-90 seconds, then add carbon nanotubes, carbon black, self-lubricant, alkane oil and plasticizer, and mix to form sheets;

[0073] c) Second stage of mixing: Add sulfur, accelerator and anti-scorching agent, mix evenly and then discharge the glue.

[0074] The present invention will be further described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0075] Examples 1-4 prepared the rubber materials of the present invention according to the proportions (parts by mass) shown in Table 1.

[0076] Table 1: Formulation Table for Examples 1-4 (Unit: Parts by Mass)

[0077]

[0078] Preparation method:

[0079] 1. SVR3L natural rubber is thin-pass plasticized 10 times on an open mill, and then the sheets are left to stand for 6 hours.

[0080] 2. Add the plasticized rubber, zinc oxide, stearic acid, antioxidant RD, antioxidant 4010NA, and microcrystalline wax into a mixer (initial temperature 60℃) and mix for 75 seconds.

[0081] 3. Add carbon nanotubes, carbon black N339, carbon black N550, self-lubricant, alkane oil, and ester plasticizer, mix until the temperature rises to 150℃, remove the glue and sheet, and cool and stand for 6 hours.

[0082] 4. Wrap a section of compound rubber around a roller on a two-roll mill, and add accelerator CZ, accelerator TT, anti-scorching agent CTP and sulfur in sequence. Cut the rubber with the left and right cutters 3 times each, and make triangular wrapping 5 times to ensure uniform dispersion. Then sheet the rubber to a thickness of about 2mm.

[0083] 5. Place the compounded rubber into a mold and vulcanize it at 160℃ and 15MPa for 15 minutes to obtain standard test pieces and bushing samples for performance testing.

[0084] Comparative example:

[0085] The formula used is a common natural rubber bushing (100 parts natural rubber, 50 parts carbon black N550, 5 parts zinc oxide, 2 parts stearic acid, 10 parts aromatic oil, 1.5 parts antioxidant RD, 1.8 parts sulfur, and 1.2 parts accelerator CZ).

[0086] Performance testing: The samples prepared in Examples 1-4 and the comparative examples were subjected to performance testing, and the results are recorded in Table 2.

[0087] Table 2: Performance Test Results

[0088]

[0089] As shown in Table 2, the rubber materials prepared in Examples 1-4 of this invention have significantly better tensile strength, elongation at break, and aging resistance than the comparative examples. In particular, the coefficient of dynamic friction and Akron abrasion are much lower than those of the comparative examples, which proves the excellent effect of this invention in improving wear resistance and reducing noise.

[0090] The beneficial effects of this invention are as follows:

[0091] 1. Innovative Filler System: A blend of carbon nanotubes and two different particle sizes of carbon black (N339 and N550). Carbon black N339, with its small particle size and high structure, primarily provides excellent wear resistance and reinforcement. Carbon black N550, with its larger particle size, offers good elasticity and dynamic properties. Carbon nanotubes, with their extremely high aspect ratio, form a three-dimensional thermally conductive and reinforcing network within the rubber matrix, significantly improving the material's tear resistance, wear resistance, and thermal conductivity, preventing thermal aging caused by heat accumulation, and extending product lifespan. The synergistic effect of these three components achieves an optimal balance of strength, elasticity, and durability.

[0092] 2. Dual Long-Lasting Lubrication Mechanism: Innovatively, it simultaneously utilizes ester plasticizers and self-lubricants. Ester plasticizers have limited compatibility with rubber and migrate relatively quickly to the product surface, forming an initial lubricating layer and providing immediate noise reduction. Self-lubricants (such as amides) bond more firmly to rubber, migrate more slowly, and continue to seep out after the ester plasticizers are gradually consumed, providing long-term, stable lubrication. This maintains a low coefficient of dynamic friction (≤0.4) throughout the entire product lifecycle, fundamentally eliminating abnormal noise.

[0093] 3. Excellent comprehensive performance: Through the precise design of the above components and dosages, the material of this invention ultimately exhibits the following outstanding properties:

[0094] Stiffness (Shore A): 55±3, providing moderate support stiffness and comfort;

[0095] Tensile strength: ≥20MPa, excellent mechanical properties;

[0096] Elongation at break: ≥400%, good toughness;

[0097] Ozone resistance (50pphm, 40℃, 72h): No cracking, excellent aging resistance;

[0098] The coefficient of dynamic friction is ≤0.4, which is much lower than that of ordinary rubber bushings, resulting in a significant noise reduction effect.

[0099] In some embodiments, bio-based fibers may also be added, whose unique fiber structure forms a three-dimensional network in the rubber matrix, significantly improving the tensile strength, tear resistance and modulus of the material. At the same time, the orientation structure of the fibers helps to form a directional lubricating film during friction, which works synergistically with the self-lubricating system to further reduce the coefficient of friction and improve wear resistance.

[0100] The following Examples 5-7, based on the excellent performance of Examples 1-4, further incorporate bio-based fibers, demonstrating the optimized solution of the present invention.

[0101] The pretreatment method for bio-based fibers is as follows:

[0102] Taking sisal as an example, bio-based fibers are cut into lengths of about 1 mm, placed in a 2 wt% silane coupling agent (KH-550) ethanol solution, soaked at 60°C for 2 hours, then filtered, and dried at 80°C to constant weight for later use.

[0103] Formulations for Examples 5-7 (Unit: parts by mass)

[0104]

[0105] Preparation method adjustment:

[0106] In the first mixing stage, at the step of "adding carbon nanotubes, carbon black N339, carbon black N550, self-lubricant, alkane oil, and plasticizer", pretreated bio-based fibers are added simultaneously to ensure that the fibers are uniformly dispersed in the rubber matrix along with other fillers. The remaining steps are exactly the same as in Examples 1-4.

[0107] Performance testing and comparison:

[0108] Tests were conducted on Examples 3 (fiber-free), 5, 6, and 7, and the results are recorded in the table below.

[0109] Table 3: Comparison of Reinforcing Effects of Bio-based Fibers

[0110]

[0111]

Experimental Results Analysis

[0112] As shown in Table 3, the material properties changed significantly after the addition of surface-treated bio-based fibers:

[0113] The reinforcing effect is significant: tensile strength and tear strength increase significantly with increasing fiber content (up to 5 parts). Example 6 (5 parts fiber) showed a 16.7% increase in tensile strength and a 28.9% increase in tear strength compared to Example 3 without fiber. This indicates that the fibers effectively bear the load and provide reinforcement.

[0114] Improved abrasion resistance: The abrasion loss is further reduced, indicating that the addition of fibers enhances the material's ability to resist abrasion.

[0115] Changes in hardness and elasticity: The hardness of the material increases linearly with the increase of fiber content, while the elongation at break decreases accordingly. This is a typical characteristic of fiber-reinforced materials, which improves the modulus of the material.

[0116] Stable coefficient of friction: The dynamic coefficient of friction remained at an extremely low level (≤0.16) and showed a slight improvement trend, indicating that the introduction of fibers did not have a negative impact on the excellent lubrication performance, and may even have been helpful due to their oil storage effect and changes in the behavior of the friction interface.

[0117] Optimal dosage: When the fiber addition exceeds 5 parts (such as 7 parts in Example 7), some properties (such as tensile strength and tear strength) show a downward trend. This may be due to excessive fiber causing local agglomeration, which affects the uniformity of dispersion. Therefore, about 5 parts is the optimal addition amount for overall performance.

[0118] In summary, adding 3-7 parts, preferably 5 parts, of bio-based fiber can significantly improve the mechanical strength and wear resistance of the material while maintaining its original excellent properties such as low noise, high elasticity, and aging resistance. This results in a natural rubber material for automotive stabilizer bar bushings with superior overall performance, while also giving the product better environmental characteristics.

[0119] The material of this invention is particularly suitable for manufacturing high-performance, low-noise automotive stabilizer bar bushings, which improves the overall NVH level and ride quality of the vehicle and has extremely high market application value.

[0120] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-noise natural rubber material for automotive stabilizer bar bushings, characterized in that, The following components are included by mass parts: 100 parts natural rubber 2–7 parts carbon nanotubes Carbon black N339 15–30 parts, Carbon black N550 20–30 parts, 5–8 parts zinc oxide 1–3 parts stearic acid 0–10 parts of alkane oil, 3–8 parts of ester plasticizer, 3–8 parts self-lubricating agent 2-5 parts of microcrystalline wax Anti-aging agent RD 1–3 parts, Anti-aging agent 4010NA 1–3 parts, Sulfur 1.5–3 parts, Accelerator CZ 1–2 parts, Accelerator TT 0–0.5 parts, 0–0.5 parts of anti-scorching agent CTP.

2. The low-noise natural rubber material for automotive stabilizer bar bushings according to claim 1, characterized in that, The preferred composition ratio is as follows: 100 parts natural rubber, 2 parts carbon nanotubes, 30 parts carbon black N339, 20 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 8 parts ester plasticizer, 3 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

3. The low-noise natural rubber material for automotive stabilizer bar bushings according to claim 1, characterized in that, The preferred composition ratio is as follows: 100 parts natural rubber, 2.5 parts carbon nanotubes, 28 parts carbon black N339, 25 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 6 parts ester plasticizer, 5 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

4. The low-noise natural rubber material for automotive stabilizer bar bushings according to claim 1, characterized in that, The preferred composition ratio is as follows: 100 parts natural rubber, 3 parts carbon nanotubes, 25 parts carbon black N339, 27 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 5 parts ester plasticizer, 6 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

5. The low-noise natural rubber material for automotive stabilizer bar bushings according to claim 1, characterized in that, The preferred composition ratio is as follows: 100 parts natural rubber, 4 parts carbon nanotubes, 20 parts carbon black N339, 30 parts carbon black N550, 5 parts zinc oxide, 1.5 parts stearic acid, 3 parts alkane oil, 4 parts ester plasticizer, 8 parts self-lubricant, 3 parts microcrystalline wax, 1.5 parts antioxidant RD, 1.5 parts antioxidant 4010NA, 2.5 parts sulfur, 1 part accelerator CZ, 0.2 parts accelerator TT, and 0.2 parts scorching inhibitor CTP.

6. The low-noise natural rubber material for automotive stabilizer bar bushings according to any one of claims 1-5, characterized in that, The natural rubber is one of SVR3L, SVRCV60, or SCR5.

7. The low-noise natural rubber material for automotive stabilizer bar bushings according to any one of claims 1-5, characterized in that, The ester plasticizer is one or a combination of DOA, DOS, and TP-95.

8. The low-noise natural rubber material for automotive stabilizer bar bushings according to any one of claims 1-5, characterized in that, The self-lubricating agent is one or more combinations of oleamide, erucamide, and triethanolamine.

9. The low-noise natural rubber material for automotive stabilizer bar bushings according to any one of claims 1-5, characterized in that, Its composition also includes 3-7 parts by weight of bio-based fiber.

10. The method for preparing low-noise natural rubber material for automotive stabilizer bar bushings according to any one of claims 1 to 9, characterized in that, The steps are as follows: a) First stage of plasticizing: After plasticizing the natural rubber, it is left to stand for later use; b) First stage of mixing: Mix natural rubber, zinc oxide, stearic acid, antioxidant and microcrystalline wax for 60-90 seconds, then add carbon nanotubes, carbon black, self-lubricant, alkane oil and plasticizer, and mix to form sheets; c) Second stage of mixing: Add sulfur, accelerator and anti-scorching agent, mix evenly and then discharge the glue.

Images