High-performance tire tread rubber composition and preparation method thereof

Abstract

The invention belongs to the field of all-steel radial truck tires, and provides a high-performance tire tread rubber composition and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 30-100 parts of natural rubber, 10-60 parts of butadiene styrene rubber, 20-80 parts of carbon black, 0-50 parts of white carbon black, 0-10 parts of a coupling agent, 0-10 parts of a plasticizer A, 0-15 parts of zinc oxide, 0-10 parts of rubber oil, 1-5 parts of stearic acid, 1-4 parts of protective wax, 0.5-5 parts of an anti-aging agent, 1-6 parts of sulfur powder, 0.5-3 parts of an accelerant, 0-1 part of a scorch retarder, 0.1-10 parts of modified carbon nanotubes and 0.1-10 parts of a modified NSF / NR composite material. Aiming at the problems of poor abrasion, chunking, chipping and heat accumulation of an existing tire tread, the modified carbon nanotubes, the modified NSF / NR composite material and the novel coupling agent are properly added, so that the tread rubber composition has low rolling resistance, the heat-conducting property of the rubber composition is remarkably improved, the mechanical property of a rubber material is effectively improved, and the service life of the tire is prolonged. The comprehensive performance of the tire is improved and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of all-steel radial truck tire, and relates to a high-performance tire tread rubber composition and a preparation method thereof. BACKGROUND

[0002] The information disclosed in this Background section is only for the purpose of increasing an understanding of the general background of the application and does not necessarily constitute an admission or a recognition that the information forms part of the prior art that is already known in any jurisdiction.

[0003] As a core component of heavy-duty vehicles, the balanced design of the tread rubber of all-steel radial tires has become a core problem in tire technology. As the only component of the tire that comes into contact with the road surface, the tread rubber needs to meet multiple performance requirements: low rolling resistance, excellent cut resistance, good heat conductivity, and sufficient wear resistance. There is often a mutually restrictive relationship between these properties, for example, increasing cut resistance usually requires increasing filler content or changing the vulcanization system, which will result in increased hysteresis loss and rolling resistance; while the design of reducing rolling resistance may weaken the mechanical strength and damage resistance of the tread. A low-carbon environmentally friendly high-performance rubber composition has been disclosed, which improves the low heat generation performance by adding acylhydrazone compounds, and makes the rubber compound have high mechanical properties and cut resistance by adding carbon nanotubes. However, the addition of acylhydrazone compounds results in a large increase in the Mooney viscosity of the rubber compound, and the mixing process is strictly required; although the carbon nanotubes are modified by N-hexylpyrrolidone, they cannot improve the aggregation and entanglement of the carbon nanotubes, and the problem of re-agglomeration during long-term storage and mixing and shearing processes still exists.

[0004] Therefore, there is an urgent need in the industry to develop a tire tread rubber composition that has low rolling resistance, cut resistance, and heat conductivity. SUMMARY

[0005] In order to solve the above problems, the present application provides a high-performance tire tread rubber composition and a preparation method thereof. The present application combines modified carbon nanotubes, modified NSF / NR composite materials, and a new type of coupling agent, so that the tire tread rubber composition has low rolling resistance, cut resistance, and heat conductivity.

[0006] In order to achieve the above-mentioned purposes, the present application adopts the following technical solutions: The first aspect of the present application provides a high-performance tire tread rubber composition, which is composed of the following raw materials in parts by weight: natural rubber 30-100 parts, styrene-butadiene rubber 10-60 parts, carbon black 20-80 parts, white carbon black 0-50 parts, coupling agent 0-10 parts, plasticizer A 0-10 parts, zinc oxide 0-15 parts, rubber oil 0-10 parts, stearic acid 1-5 parts, protective wax 1-4 parts, antioxidant 0.5-5 parts, sulfur powder 1-6 parts, accelerator 0.5-3 parts, anti-scorching agent 0-1 part, modified carbon nanotube 0.1-10 parts, modified NSF / NR composite material 0.1-10 parts; wherein the structure general formula of the coupling agent is as follows: .

[0007] The second aspect of the present application provides a preparation method of the high-performance tire tread rubber composition, which comprises the following steps: a first-stage mixing of natural rubber, styrene-butadiene rubber, 3 / 4-4 / 5 carbon black, white carbon black, rubber oil, modified carbon nanotube, modified NSF / NR composite material and coupling agent to obtain a first-stage masterbatch; a second-stage mixing of the remaining carbon black of the first-stage masterbatch, zinc oxide, stearic acid, protective wax and antioxidant to obtain a second-stage masterbatch; a final mixing of the second-stage masterbatch, sulfur powder, accelerator and anti-scorching agent to obtain a final masterbatch.

[0008] The third aspect of the present application provides the use of the above high-performance tire tread rubber composition in the preparation of all-steel radial load tire.

[0009] Advantages of the present application (1) The present application is aimed at the problems of poor wear, chipping, block and heat accumulation of the existing tire tread, and by adding appropriate amount of modified carbon nanotube, modified NSF / NR composite material and new coupling agent, the tire tread rubber composition has low rolling resistance, and the thermal conductivity of the rubber composition is significantly improved, the mechanical properties of the rubber compound are effectively improved, and the comprehensive performance of the tire is improved, and the service life is prolonged.

[0010] (2) The tire tread rubber composition prepared by the present application has the advantages of low rolling resistance, cutting resistance, excellent heat conduction, etc. The coupling agent used in the present application is a compound with two different functional groups at both ends of a molecule. One end can react with the rubber compound (rubber polymer), and the other end can react with the filler (carbon black / white carbon black), thereby fixing the rubber compound and the filler. The preparation method of the present application is simple, practical and easy to popularize. DETAILED DESCRIPTION

[0011] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0012] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in accordance with conventional methods in the art or according to product specifications. Similarly, unless otherwise specified, the test methods of the present invention are also tested in accordance with conventional methods in the art or the common methods or standards in the industry. In addition, any methods and materials similar to or equivalent to the described contents can be applied to the inventive method. The preferred embodiments and materials described herein are for demonstration purposes only.

[0013] The present invention provides a high-performance tire tread rubber composition, which is composed of the following raw materials in parts by weight: 30-100 parts of natural rubber, 10-60 parts of styrene-butadiene rubber, 20-80 parts of carbon black, 0-50 parts of white carbon black, 0-10 parts of coupling agent, 0-10 parts of plasticizer A, 0-15 parts of zinc oxide, 0-10 parts of rubber oil, 1-5 parts of stearic acid, 1-4 parts of protective wax, 0.5-5 parts of antioxidant, 1-6 parts of sulfur powder, 0.5-3 parts of accelerator, 0-1 part of scorch retarder, 0.1-10 parts of modified carbon nanotubes, and 0.1-10 parts of modified NSF / NR composite material. Wherein, the general structural formula of the coupling agent is as follows: .

[0014] The coupling agent of the present invention is a compound with two different functional groups at both ends of a molecule. One end can react with the rubber compound (rubber polymer) and the other end can react with the filler (carbon black / silica), thereby fixing the rubber compound and the filler.

[0015] On this basis, modified carbon nanotubes are added, using the modification method described in CN108192142A. The modified carbon nanotubes are not only well dispersed in the rubber matrix, forming a continuous phase and significantly improving thermal conductivity, but also do not reagglomerate due to long storage time or shear forces.

[0016] Finally, a modified NSF / NR composite material is added, using the modification method described in CN110066428A. The modified grafted NSF system reduces interfacial energy with the rubber, allowing for better dispersion within the rubber and excellent stability after dispersion. It also improves the mechanical properties of the rubber composition, extending tire life.

[0017] In order to obtain better performance, the application studies the amount of each component of the rubber composition, and in some embodiments, the rubber composition is composed of the following raw materials by weight: natural rubber 30-80 parts, styrene-butadiene rubber 20-60 parts, carbon black 20-45 parts, white carbon black 10-50 parts, coupling agent 0-2 parts, plasticizer A 2-10 parts, zinc oxide 3.5-15 parts, rubber oil 2-10 parts, stearic acid 2-5 parts, protective wax 1-4 parts, antioxidant 2-5 parts, sulfur powder 1-6 parts, accelerator 1.5-3 parts, anti-scorching agent 0.1-1 part, modified carbon nanotube 5-10 parts, modified NSF / NR composite material 4-10 parts, so as to obtain better low rolling resistance, cutting resistance and heat conduction performance.

[0018] The increase of the amount of the coupling agent can make the carbon black better dispersed in the rubber matrix, and the addition of the modified carbon nanotube and the modified NSF / NR composite material can effectively improve the mechanical properties and heat conduction properties of the tread rubber composition, therefore, in some embodiments, the rubber composition is composed of the following raw materials by weight: natural rubber 80-100 parts, styrene-butadiene rubber 10-20 parts, carbon black 45-80 parts, white carbon black 0-10 parts, coupling agent 2-10 parts, plasticizer A 0-2 parts, zinc oxide 0-3.5 parts, rubber oil 0-2 parts, stearic acid 1-2 parts, protective wax 1-4 parts, antioxidant 0.5-2 parts, sulfur powder 1-6 parts, accelerator 0.5-1.5 parts, anti-scorching agent 0-0.1 part, modified carbon nanotube 0.1-5 parts, modified NSF / NR composite material 0.1-4 parts, so as to obtain better performance.

[0019] In order to obtain the best performance, the application studies the amount of each raw material within the above range, and in some embodiments, the rubber composition is composed of the following raw materials by weight: natural rubber 80 parts, styrene-butadiene rubber 20 parts, carbon black 45 parts, white carbon black 10 parts, coupling agent 2 parts, plasticizer A 2 parts, zinc oxide 3.5 parts, rubber oil 2 parts, stearic acid 2 parts, protective wax 1 part, antioxidant 2 parts, sulfur powder 1 part, accelerator 1.5 parts, anti-scorching agent 0.1 part, modified carbon nanotube 5 parts, modified NSF / NR composite material 4 parts, at this time, the obtained tread rubber composition has the best low rolling resistance, cutting resistance and heat conduction performance.

[0020] The nitrogen content in the natural rubber is too high, which will affect the aging resistance of the rubber, and the plasticity will affect the processing performance, therefore, the application studies the nitrogen content, plasticity initial value and plasticity retention rate of the natural rubber, and in some embodiments, the nitrogen content of the natural rubber is 0.2-0.5%, the plasticity initial value is 35-50, and the plasticity retention rate is 60-80, so as to obtain better aging resistance and processing performance.

[0021] With the increase of styrene content, the hardness, modulus and heat resistance of the styrene-butadiene rubber are improved, but the elasticity, low temperature performance and tear strength are reduced, and the vulcanization characteristics and wear resistance also present complex changes, therefore, the combined styrene content of the styrene-butadiene rubber is researched in the application, and in some embodiments, the combined styrene content of the styrene-butadiene rubber is 22-24%, so as to obtain a tread rubber composition with better performance.

[0022] The iodine adsorption value of the carbon black can represent the particle size of the carbon black, the larger the iodine adsorption value, the smaller the surface particle size, and therefore the larger the specific surface area, for this reason, the key parameters are researched in the application, and in some embodiments, the iodine adsorption value of the carbon black is 120-140g / kg, the DBP oil adsorption value is 120-140*10-5m 3 / kg, and the nitrogen adsorption specific surface area STSA is 110-130m 2 / g, so as to obtain a tread rubber composition with better performance.

[0023] The nitrogen adsorption specific surface area of the white carbon black can affect the mechanical strength, wear resistance, elasticity and flexibility of the rubber, therefore, the nitrogen adsorption specific surface area of the white carbon black is researched in the application, and in some embodiments, the nitrogen adsorption specific surface area NSA of the white carbon black is 160-200m 2 / g, so as to obtain better mechanical strength, wear resistance, elasticity and flexibility.

[0024] C18 mainly affects the elasticity and flexibility of the rubber, and its addition can make the rubber softer, while maintaining good resilience. C16 can significantly improve the hardness and strength of the rubber, and since the molecular structure of C16 is stable, it can enhance the interaction between rubber molecules, so that the rubber product is more durable, therefore, in some embodiments, the C18 content of the stearic acid is ≥50%, and the C18+C16 content is ≥88%, so as to obtain better mechanical properties.

[0025] The rubber protective wax, as a physical antioxidant, is added to the rubber compound, can migrate from the inside of the rubber to the surface, and form a layer of inert, non-crystalline and flexible film on the surface, which can effectively prevent the reaction of the rubber with ozone and ozone aging, thereby prolonging the service life of the rubber product, for this reason, the main parameters of the protective wax are researched in the application, and in some embodiments, the normal alkane of the protective wax is 53-60%, the carbon distribution is C18-C44, and the maximum carbon distribution is C31-C33, so as to obtain better protection performance.

[0026] The application provides a preparation method of a high-performance tire tread rubber composition, comprising: mixing the natural rubber, styrene-butadiene rubber, 3 / 4-4 / 5 carbon black, white carbon black, rubber oil, modified carbon nanotube, modified NSF / NR composite material and coupling agent in a first stage to obtain a first stage masterbatch; mixing the remaining carbon black of the first stage masterbatch, zinc oxide, stearic acid, protective wax and antioxidant in a second stage to obtain a second stage masterbatch; mixing the second stage masterbatch, sulfur powder, accelerator and anti-scorching agent in a final stage to obtain the product.

[0027] The temperature, pressure and rotation speed of mixing affect the performance of the rubber, therefore, the mixing conditions of different stages are studied in the application, in some embodiments, the mixing conditions of the first stage are: the rotation speed of the internal mixer is 40-80 rpm, the upper plunger pressure is 5-8 Mpa, and the mixing is carried out to 160-170℃ to discharge the rubber; in some embodiments, the mixing conditions of the second stage are: the rotation speed of the internal mixer is 40-70 rpm, the upper plunger pressure is 4-6 Mpa, and the mixing is carried out to 150-160℃ to discharge the rubber; in some embodiments, the mixing conditions of the final stage are: the rotation speed of the internal mixer is 25-40 rpm, the upper plunger pressure is 4.5-6 Mpa, and the mixing is carried out to 100-120℃ to discharge the rubber, so that the prepared tread rubber composition has better low rolling resistance, cutting resistance and heat conduction performance.

[0028] The application will be further described in detail below in combination with specific examples, it should be pointed out that the specific examples are an explanation of the application rather than a limitation.

[0029] In the following examples and comparative examples, the coupling agent is SUMILINK®200 produced by Sumitomo Chemical, and the specific molecular structure is as follows:

[0030] The modified carbon nanotube is prepared according to the method of Example 1 in patent CN108192142A, specifically including: putting 100 parts of carbon nanotube, 150 parts of concentrated nitric acid, 50 parts of concentrated sulfuric acid and 10 parts of potassium permanganate into a reactor, mixing, treating with 50 kHz ultrasonic wave for 1 hr, then heating to 50℃, stirring and acid boiling for 2 hrs, cooling, suction filtration, washing until the filtrate is neutral, finally adding 200 parts of hexamethylenetetramine, heating to 70℃, stirring and reacting for 2 hrs, suction filtration, washing and drying to obtain carbon nanotube with amine group on the surface.

[0031] The modified NSF / NR composite material is prepared according to the method of Example 1 in patent CN110066428A, specifically including: (1) surface treatment of nylon 66 short fibers: 1) Take 20mm long nylon 66 short fibers, add appropriate amount of acetone solution, clean with ultrasonic wave for 2h, and dry in an oven for standby use.

[0032] 2) Weigh 8 g of acetone-treated fibers, add 100 ml of 10% concentration formaldehyde solution in 0.5N NaOH, heat in water bath at 80°C for 2h, then wash with deionized water for 2 times, and dry for standby use.

[0033] (2) Preparation of modified PA66 short fiber / natural rubber composite: 1) Put 100 g of NR and 8 g of treated NSF into the rubber and plastic test mixer (XSM-500, Shanghai Kechuang Rubber and Plastic Machinery Equipment Co., Ltd.) in turn, mix at 140°C and 80 r / min for 7 min, and then cool the mixed rubber sheet (i.e. masterbatch) to room temperature for standby use.

[0034] 2) Put 80 parts of the mixed masterbatch, 8 parts of stearic acid, 8 parts of zinc oxide, 2.5 parts of SPC (antioxidant), 0.9 parts of accelerator M, 2.5 parts of DM, 1 part of D, 0.8 parts of TT, and 1 part of sulfur into the double roller open mill (Φ160*320, Dongguan Zhangfeng Rubber and Plastic Machinery Co., Ltd.) in turn and mix for 7 min, and then mix for 3 min to get the sheet (i.e. mixed rubber sheet), and place for 24 h to eliminate internal stress.

[0035] In the following examples and comparative examples, the sample testing methods are as follows: Test sample preparation standard: GB / T 2941 "Rubber - General procedures for preparing and conditioning test pieces for physical tests"; 1) Tensile property: tested according to GB / T528-2009; 2) Loss factor (tan δ): tested according to GB / T 9870.1; 3) Compression heat build-up: tested according to GB / T 1687; 4) Curing condition: 150°C*30min; 5) Tensile stress: tested according to GB / T528-2009; 6) Tear strength: tested according to GB / T529-2008; 7) Thermal conductivity: tested according to GB / T 22588-2008; 8) Abrasion performance: the abrasion performance is characterized by abrasion amount, the lower the abrasion amount, the better the abrasion resistance, the abrasion amount is tested according to GB / T1689, and the abrasion index is shown in formula (1): Abrasion index = comparative example abrasion amount / example abrasion amount × 100 formula (1); the greater the abrasion index, the better the abrasion performance.

[0036] Examples 1-4 and Comparative Example 1 The rubber composition formulation and performance test results of Examples 1-4 and Comparative Example 1 are shown in Table 1. Table 1 Rubber composition formulation

[0037] The preparation process is as follows: (1) First-stage masterbatch M1: Mixing was performed using a mixer GK420. The first-stage mixing process was as follows: natural rubber, styrene-butadiene rubber, 3 / 4 carbon black, white carbon black, rubber oil, modified carbon nanotube, modified NSF / NR composite material, and new coupling agent were added and mixed. The mixer speed was 50 rpm, the upper plunger pressure was 5 Mpa, and the mixing was performed to 160°C to discharge the glue.

[0038] (2) Second-stage masterbatch M2: Mixing was performed using a mixer GK420. The second-stage mixing process was as follows: the first-stage mixed glue, the remaining 1 / 4 carbon black, zinc oxide, stearic acid, protective wax, and antioxidant were added. The mixer speed was 40 rpm, the upper plunger pressure was 5 Mpa, and the mixing was performed to 160°C to discharge the glue.

[0039] (3) Final masterbatch F: The final masterbatch was prepared using a mixer GK255. The mixing process was as follows: the second-stage mixed glue, sulfur powder, accelerator, and anti-scorching agent CTP were added. The mixer speed was 25 rpm, the upper plunger pressure was 4.5 Mpa, and the mixing was performed to 110°C to discharge the glue.

[0040] As can be seen from the comparison between Example 1 and Comparative Example 1, after adding the new coupling agent, the modulus of the rubber compound increased, the loss factor and the compression temperature rise decreased significantly, indicating that the interaction between the rubber and the carbon black was stronger, and the carbon black was better dispersed in the rubber matrix.

[0041] As can be seen from the comparison between Example 2 and Comparative Example 1, after adding the new coupling agent and the modified carbon nanotube, the modulus increased significantly, the tear strength improved, the thermal conductivity increased, indicating that the carbon nanotube was well dispersed in the rubber, forming a continuous phase that could better conduct the heat generated by the rubber.

[0042] As can be seen from the comparison between Example 3 and Comparative Example 1, after adding the new coupling agent and the modified NSF / NR composite material, the modulus of the rubber compound increased significantly.

[0043] As can be seen from the comparison between Example 4 and Comparative Example 1, after adding the new coupling agent, the modified carbon nanotube, and the modified NSF / NR composite material, the modulus of the rubber compound increased significantly, the elongation rate decreased slightly, the tear strength improved, the thermal conductivity increased, and the loss factor (tan δ) decreased significantly.

[0044] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high performance tire tread rubber composition characterized in that, The natural rubber is 30-80 parts by weight, the styrene-butadiene rubber is 20-60 parts by weight, the carbon black is 20-45 parts by weight, the white carbon black is 10-50 parts by weight, the coupling agent is 0-2 parts by weight, the plasticizer A is 2-10 parts by weight, the zinc oxide is 3.5-15 parts by weight, the rubber oil is 2-10 parts by weight, the stearic acid is 2-5 parts by weight, the protective wax is 1-4 parts by weight, the antioxidant is 2-5 parts by weight, the sulfur powder is 1-6 parts by weight, the accelerator is 1.5-3 parts by weight, the anti-scorching agent is 0.1-1 part by weight, the modified carbon nanotube is 5-10 parts by weight, and the modified NSF / NR composite material is 4-10 parts by weight. The structure general formula of the coupling agent is as follows: 。 2. The high performance tire tread rubber composition of claim 1 wherein, The natural rubber is 30-80 parts by weight, the styrene-butadiene rubber is 20-60 parts by weight, the carbon black is 20-45 parts by weight, the white carbon black is 10-50 parts by weight, the coupling agent is 0-2 parts by weight, the plasticizer A is 2-10 parts by weight, the zinc oxide is 3.5-15 parts by weight, the rubber oil is 2-10 parts by weight, the stearic acid is 2-5 parts by weight, the protective wax is 1-4 parts by weight, the antioxidant is 2-5 parts by weight, the sulfur powder is 1-6 parts by weight, the accelerator is 1.5-3 parts by weight, the anti-scorching agent is 0.1-1 part by weight, the modified carbon nanotube is 5-10 parts by weight, and the modified NSF / NR composite material is 4-10 parts by weight.

3. The high performance tire tread rubber composition of claim 1 wherein, The natural rubber is 30-80 parts by weight, the styrene-butadiene rubber is 20-60 parts by weight, the carbon black is 20-45 parts by weight, the white carbon black is 10-50 parts by weight, the coupling agent is 0-2 parts by weight, the plasticizer A is 2-10 parts by weight, the zinc oxide is 3.5-15 parts by weight, the rubber oil is 2-10 parts by weight, the stearic acid is 2-5 parts by weight, the protective wax is 1-4 parts by weight, the antioxidant is 2-5 parts by weight, the sulfur powder is 1-6 parts by weight, the accelerator is 1.5-3 parts by weight, the anti-scorching agent is 0.1-1 part by weight, the modified carbon nanotube is 5-10 parts by weight, and the modified NSF / NR composite material is 4-10 parts by weight.

4. The high performance tire tread rubber composition of claim 1 wherein, The natural rubber is 30-80 parts by weight, the styrene-butadiene rubber is 20-60 parts by weight, the carbon black is 20-45 parts by weight, the white carbon black is 10-50 parts by weight, the coupling agent is 0-2 parts by weight, the plasticizer A is 2-10 parts by weight, the zinc oxide is 3.5-15 parts by weight, the rubber oil is 2-10 parts by weight, the stearic acid is 2-5 parts by weight, the protective wax is 1-4 parts by weight, the antioxidant is 2-5 parts by weight, the sulfur powder is 1-6 parts by weight, the accelerator is 1.5-3 parts by weight, the anti-scorching agent is 0.1-1 part by weight, the modified carbon nanotube is 5-10 parts by weight, and the modified NSF / NR composite material is 4-10 parts by weight.

5. The high performance tire tread rubber composition of claim 1 wherein, The nitrogen content of the natural rubber is 0.2-0.5%, the plasticity initial value is 35-50, and the plasticity retention rate is 60-80. Or, the bound styrene content of the styrene-butadiene rubber is 22-24%.

6. The high performance tire tread rubber composition of claim 1 wherein, The iodine adsorption number of the carbon black is 120-140 g / kg, the DBP oil absorption number is 120-140 x 10-5 m 3 / kg, and the nitrogen adsorption specific surface area STSA is 110-130 m 2 / g. or, the nitrogen adsorption specific surface area NSA of the white carbon black is 160 to 200 m 2 / g.

7. The high performance tire tread rubber composition of claim 1 wherein, The C18 content of the stearic acid is ≥50%, and the C18+C16 content is ≥88%. Or, the normal alkane of the protective wax is 53-60%, the carbon distribution is C18-C44, and the maximum carbon distribution is C31-C33. Or, the normal alkane of the protective wax is 53-60%, the carbon distribution is C18-C44, and the maximum carbon distribution is C31-C33.

8. A method of preparing a high performance tire tread rubber composition characterized in that, It comprises: The natural rubber, the styrene-butadiene rubber, the 3 / 4-4 / 5 carbon black, the white carbon black, the rubber oil, the modified carbon nanotube, the modified NSF / NR composite material and the coupling agent are subjected to one-stage mixing to obtain one-stage masterbatch; The remaining carbon black of the first-stage masterbatch, zinc oxide, stearic acid, protective wax and antioxidant are subjected to second-stage mixing to obtain a second-stage masterbatch; The second-stage masterbatch, sulfur powder, accelerator and anti-scorching agent are subjected to final mixing to obtain the final rubber compound.

9. The method of making a high performance tire tread rubber composition of claim 8, wherein, The first-stage mixing is carried out at a speed of 40-80 rpm, an upper plunger pressure of 5-8 Mpa and a mixing temperature of 160-170 DEG C; Or, the second-stage mixing is carried out at a speed of 40-70 rpm, an upper plunger pressure of 4-6 Mpa and a mixing temperature of 150-160 DEG C; Or, the final mixing is carried out at a speed of 25-40 rpm, an upper plunger pressure of 4.5-6 Mpa and a mixing temperature of 100-120 DEG C.

10. Use of the high-performance tire tread rubber composition according to any one of claims 1-7 for the preparation of a full steel radial truck tire.

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