A low viscosity high cut resistant low hysteresis rubber composition for tire tread and a method of preparing the same

Abstract

The application belongs to the technical field of rubber materials and tire manufacturing, and particularly relates to a low-viscosity high-cutting-resistance low-heat-generating rubber composition for tire tread and a preparation method thereof. The low-viscosity high-cutting-resistance low-heat-generating rubber composition for tire tread is prepared from the following components and raw materials in the following proportions based on 100 parts by weight of natural rubber: natural rubber 100 parts, carbon black 30-65 parts, white carbon black 8-25 parts, 2-hydroxy-1-hydroxymethyl ethyl hexadecanoate 1-3 parts, silane coupling agent 0.5-6 parts, carbon black coupling agent 0.5-1.5 parts, antioxidant 1-4.0 parts, B-type microcrystalline wax 0.5-1.5 parts, stearic acid 0.8-3.5 parts, zinc oxide 1-6.5 parts, accelerator 0.8-4.0 parts, and vulcanizing agent 1.0-3.5 parts. The application introduces 2-hydroxy-1-hydroxymethyl ethyl hexadecanoate into the rubber, and through the synergistic effect of interface modification, dispersion optimization and chain segment lubrication, the rubber network structure is strengthened while the processability is improved, so as to obtain the low-viscosity high-cutting-resistance low-heat-generating rubber composition.

Description

Technical Field

[0001] This invention belongs to the field of rubber materials and tire manufacturing technology, specifically relating to a low-viscosity, high-cut-resistant, and low-heat-generating rubber composition for tire treads and its preparation method. Background Technology

[0002] Giant engineering radial tires are mostly used in mines, slag heaps, and unpaved and harsh road surfaces. The tread is subjected to the impact and cutting of sharp stones, requiring the rubber compound to have extremely high cut resistance, tear resistance and fatigue resistance.

[0003] Improving cut resistance typically relies on high-filler reinforcing systems, but this leads to a significant increase in Mooney viscosity of the rubber compound, resulting in high mixing loads, extrusion difficulties, poor surface quality, and increased energy consumption. Using traditional plasticizers or processing oils to reduce viscosity often weakens the rubber network strength, leading to decreased cut and abrasion resistance, while also exacerbating dynamic heat generation, impacting tire lifespan and safety.

[0004] Existing technologies struggle to reduce viscosity and improve processability while maintaining cut resistance and preventing increased heat generation. Therefore, developing rubbers suitable for giant tire treads that achieve a synergistic effect of "low viscosity + high cut resistance + stable heat generation" has significant industrial value. Summary of the Invention

[0005] In view of the fact that existing technologies for tire tread rubber can reduce viscosity and improve processability while making it difficult to ensure that cut resistance does not decrease and heat generation does not increase, this invention provides a low-viscosity, high-cut-resistance, and low-heat-generating rubber composition for tire tread and its preparation method.

[0006] The specific technical solution of the present invention is as follows: A tire tread composition of low viscosity, high cut resistance, and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 30-65 parts carbon black, 8-25 parts silica, 1-3 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 0.5-6 parts silane coupling agent, 0.5-1.5 parts carbon black coupling agent, 1-4.0 parts antioxidant, 0.5-1.5 parts type B microcrystalline wax, 0.8-3.5 parts stearic acid, 1-6.5 parts zinc oxide, 0.8-4.0 parts accelerator, and 1.0-3.5 parts vulcanizing agent.

[0007] Tires made from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 45-60 parts carbon black, 8-15 parts silica, 1.2-2.8 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 1-4 parts silane coupling agent, 0.8-1.2 parts carbon black coupling agent, 1.5-3.5 parts antioxidant, 0.8-1.2 parts type B microcrystalline wax, 1-3 parts stearic acid, 2-6 parts zinc oxide, 0.9-3.5 parts accelerator, and 1.2-3 parts vulcanizing agent.

[0008] Tires made from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 40-60 parts carbon black, 10-12 parts silica, 1.5-2.5 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0009] The silica is precipitated silica, and the BET specific surface area of ​​the silica is 150-200 m² / g.

[0010] The accelerator is N-tert-butyl-2-benzothiazole sulfenamide; the vulcanizing agent is oil-extended sulfur.

[0011] The carbon black has a particle size of 20–40 nm.

[0012] A method for preparing the above-mentioned low-viscosity, high-cut-resistance, and low-heat-generating rubber composition for tire tread comprises the following steps: S1. First stage of internal mixing: Preheat the internal mixer to 80-90℃, add natural rubber for plasticizing, and plasticize for 30-60 seconds; then add carbon black, silica, silane coupling agent, carbon black coupling agent, antioxidant, type B microcrystalline wax, stearic acid and 2-hydroxy-1-hydroxymethyl ethyl hexadecanoate to the internal mixer in sequence, mix until the rubber compound temperature reaches 150-160℃, then discharge the rubber and let it stand at room temperature to obtain the masterbatch; S2, Second-stage open milling: The masterbatch rubber after step S1 is put into the open mill for re-rolling and rolling. Accelerator, zinc oxide and vulcanizing agent are added in sequence. The mixture is rolled into a triangular shape, sheeted and left to stand. After the mixing is completed, the final rubber is sheeted and left to stand at room temperature to obtain the final rubber, which is a low-viscosity, high-cut-resistant and low-heat-generating rubber composition.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention introduces 2-hydroxy-1-hydroxymethylethyl hexadecanoate (2-monopalmitoylglycerol) into rubber. The 2-hydroxy-1-hydroxymethylethyl hexadecanoate molecule simultaneously possesses a long-chain hydrophobic alkyl group and an ortho-position amphiphilic hydroxyl group, exhibiting a typical amphiphilic structure, and plays a triple core role in the rubber system: The mechanism of filler dispersion strengthening: The hydroxyl groups in the 2-hydroxy-1-hydroxymethylethyl hexadecanoate molecule can form hydrogen bonds with the hydroxyl groups on the surface of silica and the active sites on the surface of silica, thereby achieving in-situ coating and wetting of filler particles, significantly weakening filler-filler agglomeration and network structure, making the carbon black and silica more uniformly dispersed and finer in particle size, reducing internal defects and stress concentration points, and fundamentally improving the ability to resist cutting and crack propagation. Mechanism of rubber viscosity reduction and processing improvement: Long-chain alkyl groups have excellent compatibility with rubber hydrocarbons and can insert into the gaps between rubber macromolecular chains, reducing intra-chain friction and physical entanglement density, significantly reducing Mooney viscosity and mixing torque, thereby increasing powder intake speed during mixing, improving the smoothness and surface finish of the extruded rubber compound, and improving processing throughput without sacrificing reinforcement. (3) Interface optimization and heat generation stabilization mechanism: 2-hydroxy-1-hydroxymethyl ethyl hexadecanoate molecules do not participate in vulcanization crosslinking, forming a flexible transition interface layer at the rubber-filler interface, which not only improves the interface bonding strength, but also does not abnormally increase the crosslinking density or hinder the chain segment movement, so that the dynamic hysteresis loss is comparable to the basic formulation. Therefore, the compression heat generation of the vulcanized rubber remains stable, achieving the unity of "high cut resistance, low viscosity, and low heat generation".

[0014] Unlike traditional plasticizers / lubricants, the additive of this invention—2-hydroxy-1-hydroxymethylethyl hexadecanoate—does not reduce viscosity by diluting the rubber network. Instead, it enhances the rubber network structure while improving processability through the synergistic effects of interface modification, dispersion optimization, and chain segment lubrication. Therefore, it achieves no decrease in strength and no increase in heat generation, thus solving the long-standing technical contradiction of giant tire treads. Attached Figure Description

[0015] Figure 1 The structural formula of 2-hydroxy-1-hydroxymethylethyl hexadecanoate of the present invention is shown below.

[0016] Figure 2 The structural formula of the 3-pentadecanyl valerate of the present invention is shown below. Detailed Implementation

[0017] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0018] This invention introduces 2-hydroxy-1-hydroxymethylethyl hexadecanoate (2-monopalmitoylglycerol) into rubber, with the following structural formula: Figure 1As shown, the 2-hydroxy-1-hydroxymethylethyl hexadecanoate molecule simultaneously possesses a long-chain hydrophobic alkyl group and an ortho-position amphiphilic hydroxyl group, exhibiting a typical amphiphilic structure. Through the synergistic effects of interface modification, dispersion optimization, and chain segment lubrication, the rubber network structure is strengthened while improving processability, thereby obtaining a low-viscosity, high-cut-resistance, and low-heat-generating rubber composition. Example 1

[0019] A tire tread composition of low viscosity, high cut resistance, and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 30 parts carbon black, 8 parts silica, 1 part 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 0.5 parts silane coupling agent, 0.5 parts carbon black coupling agent, 1 part antioxidant, 0.5 parts type B microcrystalline wax, 0.8 parts stearic acid, 1.0 part zinc oxide, 0.8 parts accelerator, and 1.0 part vulcanizing agent.

[0020] A method for preparing a low-viscosity, high-cut-resistance, and low-heat-generating rubber composition for tire treads, comprising the following specific steps: S1. First stage of internal mixing: Preheat the internal mixer to 85°C, add 100 parts of natural rubber for plasticizing, and plasticize for 45 seconds; then add 30 parts of carbon black, 8 parts of silica, 0.5 parts of silane coupling agent, 0.5 parts of carbon black coupling agent, 1 part of antioxidant, 0.5 parts of type B microcrystalline wax, 0.8 parts of stearic acid and 1 part of 2-hydroxy-1-hydroxymethyl ethyl hexadecanoate to the internal mixer in sequence, mix until the rubber compound temperature reaches 155°C, then discharge the rubber and let it stand at room temperature to obtain the masterbatch; S2, Second-stage open milling: The masterbatch rubber after step S1 is put into the open mill for re-rolling and rolling. 0.8 parts of accelerator, 1.0 part of zinc oxide and 1.0 part of vulcanizing agent are added in sequence. The mixture is rolled into a triangular shape, sheeted and left to stand. After the mixing is completed, the mixture is sheeted and left to stand at room temperature to obtain the final rubber, which is a low-viscosity, high-cut-resistance, and low-heat-generating rubber composition. Example 2

[0021] A tire tread composition of low viscosity, high cut resistance, and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 47 parts carbon black, 16 parts silica, 2 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 3.2 parts silane coupling agent, 1 part carbon black coupling agent, 2.5 parts antioxidant, 1 part type B microcrystalline wax, 2.2 parts stearic acid, 3.8 parts zinc oxide, 2.4 parts accelerator, and 2.3 parts vulcanizing agent.

[0022] Repeat the steps of Example 1, except that the components and proportions of Example 2 are used. Example 3

[0023] A tire tread composition of low viscosity, high cut resistance, and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 65 parts carbon black, 25 parts silica, 3 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 6 parts silane coupling agent, 1.5 parts carbon black coupling agent, 4.0 parts antioxidant, 1.5 parts type B microcrystalline wax, 3.5 parts stearic acid, 6.5 parts zinc oxide, 4.0 parts accelerator, and 3.5 parts vulcanizing agent.

[0024] Repeat the steps of Example 1, except that the components and proportions of Example 3 are used. Example 4

[0025] A tire tread composition of low viscosity, high cut resistance, and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 45 parts carbon black, 8 parts silica, 1.2 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 1 part silane coupling agent, 0.8 parts carbon black coupling agent, 1.5 parts antioxidant, 0.8 parts type B microcrystalline wax, 1 part stearic acid, 2 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0026] Repeat the steps of Example 1, except that the components and proportions of Example 4 are used. Example 5

[0027] A tire tread composition of low viscosity, high cut resistance, and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 52.5 parts carbon black, 11.5 parts silica, 2 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2.5 parts silane coupling agent, 1 part carbon black coupling agent, 2.5 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 4 parts zinc oxide, 2.2 parts accelerator, and 2.1 parts vulcanizing agent.

[0028] Repeat the steps of Example 1, except that the components and proportions of Example 5 are used. Example 6

[0029] A tire tread composition of low viscosity, high cut resistance, and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 60 parts carbon black, 15 parts silica, 2.8 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 4 parts silane coupling agent, 1.2 parts carbon black coupling agent, 3.5 parts antioxidant, 1.2 parts type B microcrystalline wax, 3 parts stearic acid, 6 parts zinc oxide, 3.5 parts accelerator, and 3 parts vulcanizing agent.

[0030] Repeat the steps of Example 1, except that the components and proportions of Example 6 are used. Example 7

[0031] A tire tread composition of low viscosity, high cut resistance and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 40 parts carbon black, 10 parts silica, 1.2 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0032] Repeat the steps of Example 1, except that the components and proportions of Example 7 are used. Example 8

[0033] A tire tread composition of low viscosity, high cut resistance and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 50 parts carbon black, 12 parts silica, 2.0 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0034] Repeat the steps of Example 1, except that the components and proportions of Example 8 are used. Example 9

[0035] A tire tread composition of low viscosity, high cut resistance and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 60 parts carbon black, 18 parts silica, 2.8 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0036] Repeat the steps of Example 1, except that the components and proportions of Example 9 are used. Example 10

[0037] A tire tread composition of low viscosity, high cut resistance and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 50 parts carbon black, 12 parts silica, 1.6 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0038] Repeat the steps of Example 1, except that the components and proportions of Example 10 are used. Example 11

[0039] A tire tread composition of low viscosity, high cut resistance and low heat generation rubber, prepared from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 50 parts carbon black, 12 parts silica, 2.2 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0040] Repeat the steps of Example 1, except that the components and proportions of Example 11 are used. Example 12

[0041] A tire tread low-viscosity, high-cut-resistance, low-heat-generating rubber composition, based on 100 parts by weight of natural rubber, comprises the following components and proportions: 100 parts natural rubber, 50 parts carbon black, 12 parts silica, 2.4 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

[0042] Repeat the steps of Example 1, except that the components and proportions of Example 12 are used.

[0043] In the above embodiments, the silica is further described as precipitated silica with a BET specific surface area of ​​150-200 m² / g.

[0044] In the above embodiments, the accelerator is further described as N-tert-butyl-2-benzothiazole sulfenamide (NS); and the vulcanizing agent is oil-extended sulfur.

[0045] In the above embodiments, the particle size of the carbon black is further 20-40 nm.

[0046] The performance of the rubber composition materials of Examples 7-12 and the reference and comparative examples 1-3 will be tested. The components and proportions of the raw materials included in the rubber composition materials of the reference and comparative examples 1-3 are shown in Table 1. The preparation methods of the rubber composition materials of the reference and comparative examples 1-3 are the same as those in Example 1.

[0047] Table 1 lists the components and proportions of the rubber compositions used in the reference and comparative examples 1-3.

[0048] 3-Pentadecyl valerate, a product of Huachi Chemical Co., Ltd. 2-Hydroxy-1-hydroxymethylethyl hexadecanoate, a product of Shanghai Junyi Chemical Co., Ltd. The others are commonly used commercially available products.

[0049] The methods used for testing the performance of rubber composition materials are as follows: 1. Mooney viscosity test The test was conducted according to GB / T 1232.1-2016 "Determination of unvulcanized rubber using a disc shear viscometer - Part 1: Determination of Mooney viscosity". A large rotor was used, the test temperature was 100℃, the preheating time was 1 min, the test time was 4 min, and the ML(1+4) value at 100℃ was recorded.

[0050] 2. Cut resistance test The test was conducted using a rubber dynamic cut resistance tester. The test conditions were: rotation speed 720 r / min, impact speed 120 n / min, and set time 20 min. The cut resistance before aging was tested. The hot air aging was conducted according to GB / T 3512-2014 at 100℃ for 24 h. The cut resistance after aging was tested.

[0051] 3. Dynamic heat generation performance Tested using a Dynamic Thermomechanical Analyzer (DMA): Tensile mode: Specimen size 35×6×2mm, frequency 10Hz, static strain 5%, dynamic strain 0.25%, test temperature 60℃, record the tensile mode loss factor tanδ. Compression mode: Sample diameter 10mm, thickness 2mm, frequency 10Hz, static compression 5%, dynamic compression 0.2%, test temperature 60℃, record compression mode loss factor tanδ; The relative heat generation index was calculated with a reference ratio of 100. The lower the tanδ, the lower the heat generation and the better the performance.

[0052] The performance test results of the rubber composition materials of Examples 7-12, Reference Examples, and Comparative Examples 1-3 are shown in Table 2.

[0053] Table 2 shows the test results of the rubber composition materials in Examples 7-12, the reference examples, and Comparative Examples 1-3.

[0054] All performance metrics in this table are calculated using a relative index with a parameter ratio of 100. A higher value indicates better performance.

[0055] The data shows that the addition of 2-hydroxy-1-hydroxymethyl ethyl hexadecanoate significantly reduces the viscosity of the compound and improves its processing passability. Furthermore, the cut loss is greatly reduced, while the strength and tear resistance are improved simultaneously. The heat generated during compression is basically the same as that of the comparative ratio, achieving a synergistic effect of low viscosity, high cut resistance, and stable heat generation.

[0056] The rubber composition prepared by this invention is particularly suitable for the tread of giant engineering radial tires such as 27.00R49, 30.00R51, and 46 / 90R57, and has a longer service life and higher safety under harsh working conditions.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. All modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A low-viscosity, high-cut-resistant, low-heat-generating rubber composition for tire treads, characterized in that, Tires made from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 30-65 parts carbon black, 8-25 parts silica, 1-3 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 0.5-6 parts silane coupling agent, 0.5-1.5 parts carbon black coupling agent, 1-4.0 parts antioxidant, 0.5-1.5 parts type B microcrystalline wax, 0.8-3.5 parts stearic acid, 1-6.5 parts zinc oxide, 0.8-4.0 parts accelerator, and 1.0-3.5 parts vulcanizing agent.

2. The low-viscosity, high-cut-resistance, low-heat-generating rubber composition for tire tread as described in claim 1, characterized in that, Tires made from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 45-60 parts carbon black, 8-15 parts silica, 1.2-2.8 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 1-4 parts silane coupling agent, 0.8-1.2 parts carbon black coupling agent, 1.5-3.5 parts antioxidant, 0.8-1.2 parts type B microcrystalline wax, 1-3 parts stearic acid, 2-6 parts zinc oxide, 0.9-3.5 parts accelerator, and 1.2-3 parts vulcanizing agent.

3. The low-viscosity, high-cut-resistance, low-heat-generating rubber composition for tire tread as described in claim 2, characterized in that, Tires made from raw materials comprising the following components and proportions based on 100 parts by weight of natural rubber: 100 parts natural rubber, 40-60 parts carbon black, 10-12 parts silica, 1.5-2.5 parts 2-hydroxy-1-hydroxymethylethyl hexadecanoate, 2 parts silane coupling agent, 1 part carbon black coupling agent, 3 parts antioxidant, 1 part type B microcrystalline wax, 2 parts stearic acid, 5 parts zinc oxide, 0.9 parts accelerator, and 1.2 parts vulcanizing agent.

4. The low-viscosity, high-cut-resistance, low-heat-generating rubber composition for tire tread as described in claim 3, characterized in that, The silica is precipitated silica, and the BET specific surface area of ​​the silica is 150-200 m² / g.

5. The low-viscosity, high-cut-resistance, low-heat-generating rubber composition for tire tread as described in claim 4, characterized in that, The accelerator is N-tert-butyl-2-benzothiazole sulfenamide; the vulcanizing agent is oil-extended sulfur.

6. The low-viscosity, high-cut-resistance, low-heat-generating rubber composition for tire tread as described in claim 5, characterized in that, The carbon black has a particle size of 20–40 nm.

7. A method for preparing a low-viscosity, high-cut-resistance, low-heat-generating rubber composition for tire treads as described in any one of claims 1-6, characterized in that, The specific steps are as follows: S1. First stage of internal mixing: Preheat the internal mixer to 80-90℃, add natural rubber for plasticizing, and plasticize for 30-60 seconds; then add carbon black, silica, silane coupling agent, carbon black coupling agent, antioxidant, type B microcrystalline wax, stearic acid and 2-hydroxy-1-hydroxymethyl ethyl hexadecanoate to the internal mixer in sequence, mix until the rubber compound temperature reaches 150-160℃, then discharge the rubber and let it stand at room temperature to obtain the masterbatch; S2, Second-stage open milling: The masterbatch rubber after step S1 is put into the open mill for re-rolling and rolling. Accelerator, zinc oxide and vulcanizing agent are added in sequence. The mixture is rolled into a triangular shape, sheeted and left to stand. After the mixing is completed, the final rubber is sheeted and left to stand at room temperature to obtain the final rubber, which is a low-viscosity, high-cut-resistant and low-heat-generating rubber composition.

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