A super wear-resistant double filler system tread rubber composition and a mixing method thereof

Abstract

The application relates to the technical field of tire rubber manufacturing, and discloses a super-wear-resistant double-filler-system tread rubber composition and a mixing method thereof. The application adopts a double-filler system of composite carbon black CNT92 and high-structure furnace carbon black, and through the synergistic regulation of specific proportioning and mixing platforms, the Payne effect Delta G', hardness (Shore A) and M10 (10% strain stress) of vulcanized rubber are simultaneously brought into a specific window, so that the tread rubber composition with high wear resistance, low temperature rise and stable wet ground grip is obtained without introducing a third filler.

Description

Technical Field

[0001] This invention relates to the field of tire rubber manufacturing technology, and more specifically, to an ultra-wear-resistant dual-filler system tread rubber composition and its mixing method. Background Technology

[0002] Driven by the rapid popularization of new energy vehicles and the large-scale application of high-load urban delivery scenarios, tire tread materials are facing unprecedented performance challenges. The increased weight of battery packs in new energy vehicles leads to a higher static load on the tread, and the instantaneous torque output characteristics of the motor cause the tread to bear higher shear stress during start-up and braking. The frequent start-stop and long-term low-speed driving conditions of urban delivery vehicles exacerbate the thermo-mechanical coupling cycle of the tread rubber, resulting in a shorter fatigue crack initiation cycle. Wear mileage has become a core indicator determining tire life and user operating costs, and the performance shortcomings of traditional tread rubber compositions are becoming increasingly prominent.

[0003] To improve tread wear resistance, the industry has conducted extensive research and developed various technical solutions, but all have performance drawbacks that are difficult to balance. For example, increasing the amount of high-structure carbon black (such as N234 and N134), using vulcanization systems containing polysulfide bonds to increase initial modulus, or using silica / silane systems (the "green tire" route) to reduce hysteresis. However, high-structure carbon black easily forms a strong filler-filler network (high Payne effect), leading to increased temperature rise and energy consumption under high-temperature conditions in actual vehicles, and a decrease in wet grip and handling stability peak values. While CV-biased or high-sulfur vulcanization systems can improve initial hardness, they increase the risk of reversion, reduce thermal fatigue life, and cause unstable wear over long distances. In carbon black-based tread systems, replacing carbon black with a small amount of uncoupled silica often results in insufficient interfacial coupling and a "dilution effect" on the carbon black network, leading to hysteresis (tanδ) in the 0-20℃ range and support (tanδ) in the 30-60℃ range. With both the number of wetlands decreasing and the soil moisture decreasing, it is difficult to improve the soil's grip, and it may even worsen.

[0004] Chinese invention patent 202211114735.8 incorporates the superior properties of carbon nanotubes into carbon black, forming a novel carbon black / carbon nanotube aggregate. This aggregate maintains the structural advantages of carbon nanotubes, such as a high aspect ratio and specific surface area, while effectively reducing the problem of carbon nanotube fly-off. Adding this carbon nanotube / carbon black aggregate to rubber compounds can significantly improve the physical and mechanical properties of the compounds, while reducing hysteresis loss and rolling resistance without compromising their wet skid resistance, showing promising development prospects. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an ultra-wear-resistant dual-filler system tread rubber composition and its mixing method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A super wear-resistant dual-filler tread rubber composition, wherein the rubber composition is prepared by mixing raw materials comprising the following components based on 100 parts by weight of raw rubber:

[0008] 100 parts by weight of raw rubber

[0009] 48-65 parts by weight of filler

[0010] Surfactant 1-12 parts by weight,

[0011] Vulcanization accelerator 1.0–2.5 parts by weight,

[0012] Sulfur 0.8–1.5 parts by weight,

[0013] The filler is composed of composite carbon black CNT92 and high-structure furnace black; CNT92 is a composite of carbon nanotubes (CNT) and high-structure furnace black.

[0014] The rubber composition uses an effective vulcanization system (EV) or a semi-vulcanization system (SEV).

[0015] The rubber composition is mixed at a high temperature plateau of 20–45 s;

[0016] The rubber composition, after vulcanization, satisfies the following: =1100~1500kPa (60℃, 10Hz, 0.28% and 40% strain difference), Shore A (23℃) =62~65, M10 (23℃) =1.6~2.0MPa.

[0017] Preferably, the rubber composition is prepared by mixing raw materials comprising the following components based on 100 parts by weight of raw rubber:

[0018] 100 parts by weight of raw rubber

[0019] 48-65 parts by weight of filler

[0020] Surfactant 1-12 parts by weight,

[0021] Vulcanization accelerator 1.0–2.5 parts by weight,

[0022] Sulfur 1.6–1.8 parts by weight,

[0023] Anti-aging agent 1-5 parts by weight,

[0024] 2-8 parts by weight of tackifying resin

[0025] 5-15 parts by weight of rubber oil

[0026] 0.05 to 0.15 parts by weight of anti-scorching agent.

[0027] Preferably, the amount of CNT92 used is 18 to 26 parts by weight, and the amount of high-structure furnace black used is 30 to 40 parts by weight.

[0028] Preferably, the ratio of CNT92 to high-structure furnace black is (0.5-0.9):1.

[0029] Preferably, the carbon nanotube content in the CNT92 is 1-5 wt%.

[0030] Preferably, the high-structure furnace black is N234.

[0031] Preferably, the rubber composition satisfies the following after vulcanization: =1200~1400kPa (60℃, 10Hz, 0.28% and 40% strain difference), Shore A (23℃) =63~65, M10 (23℃) =1.7~1.9MPa.

[0032] Preferably, the raw rubber comprises 40-70 parts by weight of solution-polymerized styrene-butadiene rubber and 30-60 parts by weight of butadiene rubber.

[0033] Preferably, the carbon nanotubes are multi-walled carbon nanotubes.

[0034] Furthermore, the present invention also provides a mixing method for the aforementioned ultra-wear-resistant dual-filler system tread rubber composition, comprising the following steps:

[0035] 1) One-stage mixing: Raw rubber, filler, activator, antioxidant, anti-scorching agent and 30-70% rubber oil are mixed in one stage, and the mixing peak temperature is controlled at 155-160℃ and plateaued for 20-45 seconds;

[0036] 2) Two-stage mixing: Add tackifying resin and the remaining rubber oil and make the sheeting temperature ≤105℃;

[0037] 3) The final refining process incorporates the vulcanization system and the sheeting temperature is kept below 105℃.

[0038] This invention utilizes a dual-filler system of composite carbon black CNT92 and high-structure furnace black, and through specific proportions and synergistic adjustment of the mixing platform, enables the Payne effect of vulcanized rubber. The hardness (Shore A) and M10 (10% strain stress) simultaneously fall within a specific window, thereby obtaining a tread rubber composition with high wear resistance, low temperature rise and stable wet grip without introducing a third filler. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 protection scope of the present invention.

[0040] The rubber composition of this embodiment is obtained by combining a rubber component formed from conjugated diene rubber with fillers, vulcanizing agents and other additives.

[0041] (Rubber composition)

[0042] Examples of conjugated diene rubbers used as rubber components include natural rubber (NR), polyisoprene rubber (IR), polybutadiene rubber (BR), styrene-butadiene rubber (SBR), styrene-isoprene copolymer rubber, butadiene-isoprene copolymer rubber, or styrene-isoprene-butadiene copolymer rubber, and various diene rubbers commonly used in tire tread rubber compositions. These conjugated diene rubbers can be used alone or in blends of two or more.

[0043] In embodiments of the present invention, blends of polybutadiene rubber (BR) and styrene-butadiene rubber (SBR) are preferred, and blends of cis-butadiene rubber (BR) and solution-polymerized styrene-butadiene rubber (SSBR) are particularly preferred as the rubber base. The ratio of the two is not particularly limited, but preferably 40-70 parts by weight of solution-polymerized styrene-butadiene rubber and 30-60 parts by weight of cis-butadiene rubber are used.

[0044] (Carbon black)

[0045] Carbon black is the most crucial reinforcing filler in tire tread compounds. Its role is not only to "fill and increase volume," but more importantly, through its interaction with rubber molecules, it comprehensively improves the mechanical properties, durability, and dynamic performance of the tread compound, directly determining the tire's wear resistance, grip, and service life.

[0046] The core function of carbon black is to provide high-strength reinforcement and improve the mechanical properties of the tire tread. During driving, the tread compound must withstand complex stresses such as compression, tension, and friction. Carbon black, through "physical adsorption + chemical bonding," forms a "rubber-carbon black network structure" with rubber molecules, fundamentally solving the problems of low strength and easy tearing in pure rubber (without carbon black). The "high specific surface area + surface activity" of carbon black are also key to improving the wear resistance of the rubber compound. Carbon black particles are uniformly dispersed in the rubber, forming a "hard, wear-resistant skeleton." When the tread rubs against the road surface, the carbon black particles can directly bear part of the frictional stress, reducing the wear and shedding of rubber molecules. Precise selection of carbon black can also balance the grip and rolling resistance of the tread compound. Carbon black can also improve the processing fluidity of the rubber compound through "dispersion" and "structure."

[0047] Carbon black has multiple classification systems based on different standards, including production processes (furnace black, channel black, thermal cracking black, etc.), rubber reinforcing properties (high reinforcement, medium reinforcement, low reinforcement), and structure (high structure, medium structure, low structure). This invention prioritizes the use of high-structure furnace black (such as N234, N375, etc.). High-structure furnace black aggregates have a "long chain, multi-branched" structure (DBP oil absorption value > 100cm³ / 100g), which can specifically address the core requirements of "low rolling resistance, high elasticity, wet skid balance" and "high filler processability" in tire tread rubber. In this embodiment, N234 is particularly preferred.

[0048] (Composite carbon black CNT92)

[0049] CNT92 composite carbon black is a composite of carbon nanotubes (CNTs) and high-structure furnace black, with N234 being the preferred high-structure furnace black. Carbon nanotubes are hollow tubular nanomaterials formed by rolling up single or multiple layers of graphene sheets. Their tubular structure and high specific surface area make them highly efficient reinforcing units, surpassing traditional reinforcing agents. The preferred mass percentage of carbon nanotubes in CNT92 composite carbon black is 1–5 wt%. The preferred ratio of CNT92 composite carbon black to high-structure furnace black is (0.5–0.9):1. Considering core issues such as cost and stability, multi-walled carbon nanotubes are selected.

[0050] (Active agent)

[0051] There are no particular limitations on the type of activator used; commonly used activators can be employed. Zinc oxide and stearic acid are typically used in combination. Commonly used zinc oxides include indirect zinc oxide, activated zinc oxide, and nano zinc oxide. Indirect zinc oxide is commonly used, but its dispersibility is poor, requiring a higher dosage. Activated zinc oxide is evenly distributed in the rubber compound, has a large contact area with hydrogen sulfide, and a greater chance of interfacial reaction. Furthermore, activated zinc oxide products have a co-catalytic effect from active substances, resulting in a high conversion rate of zinc oxide to zinc sulfide. Therefore, activated zinc oxide is an excellent vulcanizing activator, and its dosage can be appropriately reduced compared to indirect zinc oxide. Nano zinc oxide particles have a diameter in the range of 10-80 nm, a large specific surface area, and exhibit three effects: interfacial interaction, small size, and quantum tunneling, resulting in high activity and effectively reducing the amount of zinc oxide required. Commercially available stearic acid can be used as the stearic acid.

[0052] (Vulcanization accelerator)

[0053] There are no particular restrictions on the type of accelerator; commonly used vulcanization accelerators can be used. Examples include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamate, aldehyde-amine, or aldehyde-amine accelerators. These can be used alone or in combination of two or more.

[0054] Examples of sulfonamide compounds mentioned above include N-cyclohexyl-2-benzothiazolyl sulfonamide (CBS), N-tert-butyl-2-benzothiazolyl sulfonamide (TBBS), N,N-dicyclohexyl-2-benzothiazolyl sulfonamide, N-oxodiethylidene-2-benzothiazolyl sulfonamide, and N,N-diisopropyl-2-benzothiazolyl sulfonamide.

[0055] Examples of the aforementioned thiazole series include 2-mercaptobenzothiazole, dibenzothiazole disulfide, zinc salt of 2-mercaptobenzothiazole, N-cyclohexyl-2-benzothiazole sulfenamide, N-tert-butyl-2-benzothiazole sulfinamide, N-oxodiethylene-2-benzothiazole sulfenamide, derivatives of dibenzothiazole disulfide, sodium salt of 2-thiol-benzothiazole, and 2-benzothiazole disulfides.

[0056] Examples of the aforementioned thiuram series include tetramethylthiuram disulfide, tetramethylthiuram monosulfide, tetraethylthiuram disulfide, tetraisobutylthiuram disulfide, tetrabenzylthiuram disulfide, dipentylthiuram disulfide, bis(1,5-pentylene)thiuram tetrasulfide, bispentamethylenethiuram hexasulfide, tetra(2-ethylhexyl)thiuram disulfide, and bispentamethylenethiuram monosulfide.

[0057] Examples of guanidine compounds mentioned above include diphenylguanidine, di-o-toluidine, triphenylguanidine, o-toluidine, and diphenylguanidine phthalate.

[0058] Examples of dithiocarbamate compounds include zinc ethylphenyl dithiocarbamate, zinc butylphenyl dithiocarbamate, sodium dimethyl dithiocarbamate, zinc dimethyl dithiocarbamate, zinc diethyl dithiocarbamate, zinc dibutyl dithiocarbamate, zinc dipentyl dithiocarbamate, zinc dipropyl dithiocarbamate, a coordination salt of zinc pentamethylene dithiocarbamate and piperidine, zinc hexadecyl isopropyl dithiocarbamate, zinc octadecyl isopropyl dithiocarbamate, zinc dibenzyl dithiocarbamate, sodium diethyl dithiocarbamate, piperidine pentamethylene dithiocarbamate, selenium dimethyl dithiocarbamate, tellurium diethyl dithiocarbamate, cadmium dipentyl dithiocarbamate, etc.

[0059] Examples of aldehyde-amine or aldehyde-amine compounds mentioned above include acetaldehyde-aniline reactants, butyraldehyde-aniline condensates, hexamethylenetetramine, and acetaldehyde-amine reactants.

[0060] These accelerators can be used alone or in combination of two or more.

[0061] (Anti-aging agents)

[0062] There are no particular limitations on antioxidants; commonly used antioxidants can be used. Examples include amines, phenols, and heterocyclic antioxidants. They can be used alone or in combination of two or more.

[0063] Examples of amine antioxidants include N-phenyl-N'-isopropyl-p-phenylenediamine, N-1,3-dimethylbutyl-N'-phenyl-p-phenylenediamine, 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, and N-(1-methylheptyl)-N'-phenyl-p-phenylenediamine.

[0064] Examples of phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and tris[2,4-di-tert-butylphenyl] phosphite.

[0065] Examples of heterocyclic antioxidants include 2-mercaptobenzimidazole, zinc salt of 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 2-(2-hydroxyphenyl)benzimidazole, and 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD).

[0066] (Tackifying resin)

[0067] Tackifying resins are used to increase the viscosity of rubber compounds, ensuring their bond strength during molding and improving their processing flowability. There are no particular limitations on the type of tackifying resin used; commonly used rubber oils can be employed. Examples include rosin-based resins and petroleum resins; each can be used individually or in combination with two or more.

[0068] Rosin resins can include rosin glycerol esters, hydrogenated rosin glycerol esters, disproportionated rosin potassium soap, etc.; petroleum resins can include C5 petroleum resins, C9 petroleum resins, hydrogenated C5 / C9 petroleum resins, etc.; terpene resins can include terpene phenolic resins, α-terpene resins, etc.

[0069] (Rubber oil)

[0070] There are no particular limitations on rubber oils; any commonly used rubber oil can be used. Examples include paraffinic, naphthenic, and aromatic rubber oils. They can be used alone or in combination with two or more types.

[0071] Examples of paraffin-based rubber oils include paraffin oil, low-viscosity paraffin oil, high-viscosity paraffin oil, hydrogenated paraffin oil, and dewaxed paraffin oil. Among these, hydrogenated paraffin oil is preferred.

[0072] Examples of cycloalkyl-based rubber oils include naphthenic oils, low-viscosity naphthenic oils, high-viscosity naphthenic oils, and hydrogenated naphthenic oils.

[0073] Rubber oils that are aromatic compounds can be categorized as aromatic oils, high-aromatic oils, medium-aromatic oils, and low-aromatic oils.

[0074] (Example)

[0075] The formulations of the examples and comparative examples are shown in Table 1.

[0076] Table 1

[0077]

[0078] Example 1 uses 22 parts by weight of CNT92, with a total filler content of 56 parts by weight. Shore A and M10 both fall within the target window. =1300∈ [1100, 1500], Shore A=64∈ [62, 65], M10=1.8∈ [1.6, 2.0].

[0079] Example 2 used 24 parts by weight of CNT92, with a total filler content of 56 parts by weight. Shore A and M10 all fall within the target window. =1250∈ [1100, 1500], Shore A=63∈ [62, 65], M10=1.7∈ [1.6, 2.0].

[0080] Example 3 used 20 parts by weight of CNT92, with a total filler content of 56 parts by weight. Shore A and M10 both fall within the target window. =1350∈ [1100, 1500], Shore A=64∈ [62, 65], M10=1.9∈ [1.6, 2.0].

[0081] Comparative Example 1 used 30 parts by weight of CNT92, with a total filler content of 58 parts by weight. Shore A and M10 did not fall within the target window. =1700>1500, Shore A=66>65, M10=2.2>2.0.

[0082] Comparative Example 2 used 10 parts by weight of CNT92, with a total filler content of 56 parts by weight. Shore A and M10 did not fall within the target window. =780<1100, Shore A=61<62, M10=1.4<1.6.

[0083] The difference between Comparative Example 3 and Example 1 is that a third filler—silica—was introduced, used in conjunction with a silane coupling agent. Comparative Example 3 used 22 parts by weight of CNT92, with a total filler content of 56 parts by weight. Neither M10 nor M10 fell within the target window. =980<1100, Shore A=62∈ [62, 65], M10=1.5<1.6.

[0084] The difference between Comparative Example 4 and Example 1 is that the CV vulcanization system is used. Neither M10 nor M10 fell within the target window. =1550>1500, Shore A=67>65, M10=2.1>2.0.

[0085] The difference between Comparative Example 5 and Example 1 is that one mixing platform is insufficient (15s). Neither Shore A nor Shore A fell within the target window. =1650>1500, Shore A=66>65, M10=2.0.

[0086] The difference between Comparative Example 6 and Example 1 is that CNT92 is not used. Shore A and M10 did not fall within the target window. =1850>1500, Shore A=67>65, M10=2.3>2.0.

[0087] The preparation method of CNT92 is as follows:

[0088] Step 1): Using powder spraying technology, carbon nanotubes are mixed evenly with process water and then sprayed into the carbon black reactor, so that the carbon nanotubes will tightly bind with the original carbon black particles at high temperature to form a pre-aggregate.

[0089] Step 2): Through the aggregation of carbon black, carbon nanotube / carbon black aggregates are formed, and the carbon nanotube weight content in the carbon nanotube / carbon black aggregates is 4%.

[0090] Step 3): The suspended carbon nanotube / carbon black aggregate flue gas is cooled, filtered, and collected and separated by the main bag filter. The aggregate is then granulated and dried to obtain CNT92.

[0091] Carbon nanotubes: GT-300, Shandong Dazhan Nanomaterials Co., Ltd.

[0092] The sources of raw materials are shown in Table 2.

[0093] Table 2

[0094]

[0095] <Mixing Method>

[0096] The mixing methods for the examples and comparative examples are as follows:

[0097] 1) One-stage mixing: The raw rubber, filler, activator, antioxidant, scorch inhibitor and 1 / 2 rubber oil are mixed in one stage, and the mixing peak temperature is controlled at 155-160℃ and plateaued for 20-45 seconds;

[0098] 2) Two-stage mixing: Add tackifying resin and the remaining rubber oil and make the sheeting temperature ≤105℃;

[0099] 3) The final refining process incorporates the vulcanization system and the sheeting temperature is kept below 105℃.

[0100] Comparative Example 5: 15s mixing platform.

[0101] <Test Items>

[0102] 1. Payne effect ( The following parameters were used: Rubber Processing Analyzer (RPA), temperature 60℃, frequency 10 Hz, strain scan 0.2%→40%. (40%), unit kPa.

[0103] 2. Hardness (Shore A): Measured at 23°C according to ISO 7619-1.

[0104] 3. M10 (10% strain stress): Refer to ISO 37, the stress is read when stretched to 10% strain at 23°C, in MPa.

[0105] 4. Goodrich bulge heating: Refer to STM D623-A, 100℃, 0.7MPa pressure, 30min, measure steady-state temperature rise ΔT, unit ℃.

[0106] 5. DIN wear: Refer to ISO 4649, 16mm diameter cylindrical test piece, 0N load, 40m stroke, 23℃, wear life is expressed as "unit groove depth mileage index" (Example 1=100).

[0107] 6. Wet braking: For the same vehicle and the same tire pressure / load, record the braking distance (m) from 80 to 0 km / h on a standard wet road (1.0±0.2 mm water film). The smaller the braking distance, the better.

[0108] The test results are shown in Table 3.

[0109] Table 3

[0110]

[0111] As can be seen from the examples and Comparative Example 1, excessive addition of CNT92 will lead to... Shore A and M10 are both higher than the target window, and an overly strong network structure will lead to heat generation, wear and tear and higher wet braking distance.

[0112] As can be seen from the examples and Comparative Example 2, insufficient addition of CNT92 and insufficient network support will lead to higher heat generation, wear and wet braking distance, especially severe deterioration of wear resistance and wet grip performance.

[0113] As can be seen from Example 1 and Comparative Example 3, the introduction of the third filler—silica—is actually detrimental to the construction of the carbon black network, leading to... M10 falls outside the target window. Looking at other properties of the compound, the introduction of silica tends to lead to higher heat generation, lower abrasion resistance, and lower wet grip performance.

[0114] As can be seen from Example 1 and Comparative Example 4, the CV vulcanization system leads to a more significant temperature rise compared to the EV / SEV vulcanization system, and the dual-filler network compound is more inclined to adopt the EV / SEV vulcanization system.

[0115] As can be seen from Example 1 and Comparative Example 5, an insufficient mixing platform is not conducive to the network formation of the dual-filler network compound, and the mixing temperature and time should be adjusted appropriately.

[0116] As can be seen from Example 1 and Comparative Example 6, using only carbon black N234 results in higher heat generation, lower abrasion resistance, and lower wet grip performance.

[0117] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A super wear-resistant dual-filler system tread rubber composition, characterized in that, The rubber composition is prepared by mixing raw materials comprising the following components based on 100 parts by weight of raw rubber: 100 parts by weight of raw rubber 48-65 parts by weight of filler Surfactant 1-12 parts by weight, Vulcanization accelerator 1.0–2.5 parts by weight, Sulfur 0.8–1.5 parts by weight, The filler is composed of composite carbon black CNT92 and high-structure furnace black; CNT92 is a composite of carbon nanotubes and high-structure furnace black. The rubber composition uses an effective vulcanization system (EV) or a semi-vulcanization system (SEV). The rubber composition is mixed at a high temperature plateau of 20–45 s; The rubber composition, after vulcanization, satisfies the following: =1100~1500kPa (60℃, 10Hz, 0.28% and 40% strain difference), Shore A (23℃) =62~65, M10 (23℃) =1.6~2.0MPa.

2. The ultra-wear-resistant dual-filler system tread rubber composition according to claim 1, characterized in that, The rubber composition is prepared by mixing raw materials comprising the following components based on 100 parts by weight of raw rubber: 100 parts by weight of raw rubber 48-65 parts by weight of filler Surfactant 1-12 parts by weight, Vulcanization accelerator 1.0–2.5 parts by weight, Sulfur 1.6–1.8 parts by weight, Anti-aging agent 1-5 parts by weight, 2-8 parts by weight of tackifying resin 5-15 parts by weight of rubber oil 0.05 to 0.15 parts by weight of anti-scorching agent.

3. The ultra-wear-resistant dual-filler system tread rubber composition according to claim 1 or 2, characterized in that, The amount of CNT92 used is 18-26 parts by weight, and the amount of high-structure furnace black used is 30-40 parts by weight.

4. The ultra-wear-resistant dual-filler system tread rubber composition according to claim 3, characterized in that, The ratio of CNT92 to high-structure furnace black is (0.5-0.9):

1.

5. The ultra-wear-resistant dual-filler system tread rubber composition according to claim 1 or 2, characterized in that, The carbon nanotube content in the CNT92 is 1-5 wt%.

6. The ultra-wear-resistant dual-filler system tread rubber composition according to claim 1 or 2, characterized in that, The high-structure furnace black used is N234.

7. The ultra-wear-resistant dual-filler system tread rubber composition according to claim 1 or 2, characterized in that, The rubber composition, after vulcanization, satisfies the following: =1200~1400kPa (60℃, 10Hz, 0.28% and 40% strain difference), Shore A (23℃) =63~65, M10 (23℃) =1.7~1.9MPa.

8. The ultra-wear-resistant dual-filler system tread rubber composition according to claim 1 or 2, characterized in that, The raw rubber comprises 40-70 parts by weight of solution-polymerized styrene-butadiene rubber and 30-60 parts by weight of butadiene rubber.

9. A super wear-resistant dual-filler system tread rubber composition according to claim 1 or 2, characterized in that, The carbon nanotubes mentioned are multi-walled carbon nanotubes.

10. A method for mixing a super wear-resistant dual-filler system tread rubber composition according to any one of claims 1-9, characterized in that, Includes the following steps: 1) One-stage mixing: Raw rubber, filler, activator, antioxidant, anti-scorching agent and 30-70% rubber oil are mixed in one stage, and the mixing peak temperature is controlled at 155-160℃ and plateaued for 20-45 seconds; 2) Two-stage mixing: Add tackifying resin and the remaining rubber oil and make the sheeting temperature ≤105℃; 3) The final refining process incorporates the vulcanization system and the sheeting temperature is kept below 105℃.

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