Tread rubber with staggered rubber material structure, preparation method and tire adopting tread rubber

Abstract

The invention relates to the technical field of tires, and discloses tread rubber with a staggered rubber material structure, a preparation method and a tire adopting the tread rubber. The tread rubber provided by the invention comprises five tread rubber areas, namely first tread rubber, second tread rubber, third tread rubber, fourth tread rubber and fifth tread rubber in sequence, the first tread rubber adopts a rubber composition A with low abrasion and high road holding force, the third tread rubber and the fourth tread rubber adopt a rubber composition B with low rolling resistance, and the fifth tread rubber adopts a rubber composition B with low rolling resistance. And the second tread rubber and the fifth tread rubber are made of a rubber composition C with high wet grip and low noise. Through division and optimization of the structure of the tread rubber, rubber materials with different performance emphasis are adopted in different areas, the combination form of the tread rubber can balance and control the rolling resistance performance, the wear resistance performance, the braking performance and the control performance of the tire, and the tire with balanced rolling resistance, wear resistance, braking performance, control performance and comfort can be provided after vulcanization. And the optimization and balance of the tire performance are realized.

Description

Technical Field

[0001] The invention relates to the technical field of tires, and in particular to a tread rubber profile with a dislocated rubber material structure, a preparation method and a tire using the tread rubber profile. Background Art

[0002] The ultra-high performance (UHP) tire market has grown steadily in recent years, with both volume and value continuing to grow. Ultra-high performance tires refer to tires that meet road regulations and have excellent performance on wet and dry roads, meeting the demands of ultra-high performance sports car owners for ultimate driving pleasure and safety performance. As consumer demands continue to change, manufacturers focus on developing their ultra-high performance tire ranges to meet consumer performance requirements and market trends.

[0003] The ultra-high performance of a tire depends largely on the following factors: tire structure, material compound, tread design, size and weight. The tread compound structure of traditional ultra-high performance tires is as follows: Figure 1 , mainly composed of four compounds, namely tread rubber, base rubber, shoulder rubber and conductive rubber. The outer and inner tread rubbers are the same rubber. The tread rubber is responsible for providing grip, control, comfort and durability. The base rubber uses low heat generation and high adhesion rubber, focusing on adhesion strength. The shoulder rubber is responsible for flexibility at the shoulder. The conductive rubber plays a role in releasing static electricity in the vehicle. The traditional single tread formula requires more fillers to meet the performance requirements. Filling with white carbon black is beneficial to improving the braking and handling performance of the tire on wet roads, and filling with carbon black is beneficial to improving the braking and handling performance of the tire on dry roads. However, with the increase of fillers, the heat generation of the rubber increases, and the rolling resistance of the tire also increases. It is difficult for tires to achieve a good balance between grip, wear resistance and low rolling resistance. To break this devil's triangle, the tread rubber needs to take into account the performance of grip, wear and rolling resistance.

[0004] Chinese invention patent (publication number: CN114874510A, publication date: 2022-08-09) A tread rubber with a five-composite rubber structure, the tread rubber includes an upper tread rubber, a lower tread rubber, a base rubber, a shoulder rubber and a conductive rubber, the upper tread rubber, the lower tread rubber and the base rubber are arranged from the outside to the inside in sequence to form a tread layer, the upper tread rubber adopts a low rolling resistance and low heat generation rubber composition, the lower tread rubber adopts a low rolling resistance, good handling, low wear and tear resistance rubber composition; the shoulder rubber is arranged on both sides of the tread layer, the conductive rubber is located on one side of the center of the tread layer, and the conductive rubber runs through the upper tread rubber, the lower tread rubber and the base rubber from the outside to the inside. The tread rubber controls rolling resistance and handling through two different tread rubber combinations in the upper and lower layers, and can provide a tire with low rolling resistance, high wet grip and good handling performance after vulcanization.

[0005] The Chinese invention patent (publication number: CN118769767A, publication date: 2024.10.15) discloses a tread rubber profile with a five-composite tread different rubber structure and a tire thereof, the tread rubber profile includes a tread rubber, a base rubber, a conductive rubber and a shoulder rubber, the tread rubber and the base rubber are arranged from the outside to the inside in sequence to form a tread layer, the tread rubber includes an intermediate tread rubber and a shoulder tread rubber, the shoulder tread rubber is arranged on both sides of the lateral direction of the intermediate tread rubber, the intermediate tread rubber adopts a low rolling resistance rubber composition, the shoulder rubber is arranged on both sides of the lateral direction of the tread layer, the conductive rubber is located in the center of the tread layer, and the conductive rubber runs through the intermediate tread rubber and the base rubber from the outside to the inside. The rolling resistance, wear resistance, braking and handling are controlled by combining two different tread rubbers on the inside and outside, and after vulcanization, a tire with low rolling resistance, high wear resistance, good braking performance and good handling performance can be provided, which can effectively reduce the hysteresis loss of the tire shoulder while taking into account the wet grip performance of the tire. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a tread rubber profile with a staggered rubber structure, a preparation method and a tire using the tread rubber profile, which can effectively solve the single tread performance of existing ordinary tires and balance the braking, handling and rolling resistance performance on dry and wet roads.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A tread rubber profile with an asymmetric rubber structure, the tread rubber profile comprising a tread rubber, a base rubber and a shoulder rubber, the tread rubber and the base rubber being arranged from outside to inside in sequence to form a tread layer; the tread rubber comprises five tread rubber areas from left to right, namely, a first tread rubber, a second tread rubber, a third tread rubber, a fourth tread rubber and a fifth tread rubber in sequence; the shoulder rubbers are arranged on both lateral sides of the tread layer; The first tread rubber adopts low-wear, high-grip rubber composition A. In order to achieve better grip performance, especially dry grip performance, the rubber is required to have slightly higher hardness and modulus. The specific design parameters are: Shore A hardness of 66-70, 300% elongation stress of 11.0-13.0.0Mpa, tanD ≥0.35 at 0℃, tanD ≥0.22 at 20℃, composite modulus E at 20℃ * >18.0MPa, tanD is between 0.15-0.18 at 60℃, and the glass transition temperature Tg of the rubber is 12-18℃; The third and fourth tread rubbers use a low rolling resistance rubber composition B. In order to control the overall rolling resistance of the tire, the rubber composition B controls the rubber compound to have a medium hardness, but requires a very low hysteresis factor tanD. The specific parameters are as follows: Shore A hardness of 64-68, 300% elongation stress of 10.0-12.0.0MPa, tanD ≥0.30 at 0°C, tanD ≤0.18 at 20°C, and composite modulus E at 20°C. *14.0-18.0MPa, tanD≤0.10 at 60℃, and the glass transition temperature Tg of the rubber is 16-24℃; The second and fifth tread rubbers use a rubber composition C with high wet grip and low noise. The design uses medium-low hardness to reduce noise. At the same time, in order to achieve high wet slip properties, the rubber compound is required to have a high tanD at 0°C. The specific parameters are as follows: Shore A hardness of 62-66, 300% elongation stress of 8.0-10.0.0MPa, tanD ≥0.45 at 0°C, tanD of 0.14-0.18 at 20°C, and composite modulus E at 20°C. * It is 12.0-15.0MPa, tanD is 0.12-0.16 at 60℃, and the glass transition temperature Tg of the rubber is 10-16℃.

[0008] Preferably, the rubber composition A is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 15-30 parts of natural rubber, 10-25 parts of high cis-butadiene rubber, 15-30 parts of solution-polymerized styrene-butadiene rubber A, 40-60 parts of solution-polymerized styrene-butadiene rubber B, 35-55 parts of white carbon black, 25-45 parts of super wear-resistant carbon black, 3.0-5.0 parts of silane coupling agent TESPT, 1.0-3.0 parts of white carbon black dispersant, and 6.0-10 parts of alpha methyl styrene resin; in the solution-polymerized styrene-butadiene rubber A, styrene accounts for 22-28% of the total weight of the solution-polymerized styrene-butadiene rubber A, and the mass of vinyl accounts for 52-58% of the total weight of butadiene; in the solution-polymerized styrene-butadiene rubber B, styrene accounts for 33-39% of the total weight of the solution-polymerized styrene-butadiene rubber A, and the mass of vinyl accounts for 37-43% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of white carbon black is 190-210 m 2 / g; the particle size of super wear-resistant carbon black is 10-22nm.

[0009] Preferably, the rubber composition B is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 60-80 parts of solution-polymerized styrene-butadiene rubber C, 20-40 parts of low rolling resistance white carbon black modified lithium-based butadiene rubber, 5-15 parts of carbon black, 60-80 parts of highly dispersed white carbon black, 5.0-7.0 parts of mercaptosilane coupling agent, and 1.5-3.5 parts of white carbon black dispersant; in the solution-polymerized styrene-butadiene rubber C, styrene accounts for 22-28% of the total weight of the solution-polymerized styrene-butadiene rubber C, and the mass of vinyl accounts for 37-43% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of the highly dispersed white carbon black is 150-170 m 2 / g; carbon black particle size is 20-30nm.

[0010] Preferably, the rubber composition C is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 70-90 parts of solution-polymerized styrene-butadiene rubber B, 10-30 parts of neodymium-based cis-butadiene rubber, 2-8 parts of carbon black, 80-100 parts of highly dispersed white carbon black, 8.5-9.5 parts of silane coupling agent TESPT, and 1.5-3.5 parts of white carbon black dispersant; in the solution-polymerized styrene-butadiene rubber B, styrene accounts for 33-39% of the total weight of the solution-polymerized styrene-butadiene rubber A, and the mass of vinyl accounts for 37-43% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of white carbon black is 150-170 m 2 / g; the particle size of super wear-resistant carbon black is 20-30nm.

[0011] The first tread rubber is responsible for providing control, durability and conductivity. The rubber composition A used has a greater hardness, which can give the tire extreme dry grip when cornering at large angles, providing more precise steering and control.

[0012] The third tread rubber and the fourth tread rubber are responsible for providing dry grip and low rolling resistance performance, and the rubber composition B used has low rolling resistance.

[0013] The second tread rubber and the fifth tread focus on wet and silent performance. The rubber composition C used adopts a white carbon black formula with more silicon, which has better drainage, wet grip and comfort performance.

[0014] Preferably, the rubber composition A is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 20-25 parts of natural rubber, 15-20 parts of high cis-butadiene rubber, 15-25 parts of solution polymerized styrene-butadiene rubber A, 40-50 parts of solution polymerized styrene-butadiene rubber B, 40-50 parts of white carbon black, 25-35 parts of super wear-resistant carbon black, 3.5-4.5 parts of silane coupling agent TESPT, 1.5-2.5 parts of white carbon black dispersant, 7.0-9.0 parts of alpha methyl styrene resin, 1.5-2.5 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 1.5-2.5 parts of antioxidant 6PPD, 1.0-2.0 parts of microcrystalline wax, 1.0-2.0 parts of sulfur, 1.5-2.0 parts of accelerator CZ, and 0.5-1.0 parts of accelerator TBzTD; And / or, the rubber composition B is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 65-75 parts of solution-polymerized styrene-butadiene rubber C, 25-35 parts of butadiene rubber, 8-12 parts of carbon black, 65-75 parts of highly dispersed white carbon black, 5.5-6.5 parts of mercaptosilane coupling agent, 2.0-3.0 parts of white carbon black dispersant, 2.5-3.5 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 2.0-3.0 parts of antioxidant 6PPD, 1.0-2.0 parts of microcrystalline wax, 1.0-2.0 parts of sulfur, and 1.5-2.5 parts of accelerator NS; And / or, the rubber composition C is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 75-85 parts of solution polymerized styrene-butadiene rubber B, 15-25 parts of neodymium-based butadiene rubber, 3-7 parts of carbon black, 85-95 parts of highly dispersed white carbon black, 7.0-9.0 parts of silane coupling agent TESPT, 2.0-3.0 parts of white carbon black dispersant, 1.5-2.5 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 2.5-3.5 parts of antioxidant 6PPD, 1.5-2.5 parts of microcrystalline wax, 1.0-2.0 parts of sulfur, and 1.5-2.5 parts of accelerator NS.

[0015] Preferably, the super wear-resistant carbon black is N134 or N115; the highly dispersed white carbon black is Solvay 1165MP.

[0016] Preferably, the thickness of the first tread rubber and the fifth tread rubber is 7.0 mm; the thickness of the second tread rubber, the third tread rubber and the fourth tread rubber is 6.0 mm.

[0017] Preferably, the thickness of the base rubber accounts for 5-15% of the thickness of the tread layer.

[0018] Preferably, the shoulder rubber is a rubber strip with an obtuse triangle cross section, which is spliced ​​on both lateral sides of the tread layer, and the height of the shoulder rubber is 0.6-0.8 times the center height of the tread layer.

[0019] Furthermore, the present invention also provides a method for preparing the tread rubber. The asymmetric tread is prepared by feeding rubber composition A, rubber composition B, rubber composition C, base rubber, and shoulder rubber respectively through the rubber inlets of their respective screw extruders, and then extruding them through their respective screw extruders and runners, pressing them out through a pre-die component and arranging them into a preset shape, and finally passing through an extrusion die component together to compositely extrude the asymmetric tread.

[0020] Furthermore, the present invention also provides a tire, which includes a tread portion, a sidewall portion, a belt portion and a bead portion, and the tread portion is prepared by vulcanizing the tread rubber.

[0021] The beneficial effects of the present invention are as follows: the tread rubber provided by the present invention divides the work and optimizes the tread rubber structure, and different areas use rubber materials with different performance emphases. The tread rubber combination can balance and control the rolling resistance, wear resistance, braking performance and handling performance of the tire. After vulcanization, a tire with balanced rolling resistance, wear resistance, braking performance, handling performance and comfort can be provided, thereby achieving optimization and balance of tire performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a diagram of the structure of a traditional four-composite tread rubber.

[0023] Figure 2 This is a structural diagram of the tread rubber profile of the asymmetric rubber structure of the present invention.

[0024] Figure 3 It is a cross-sectional view of the tire of the present invention.

[0025] Figure 4 The tread patterns of the tires used in the embodiments and comparative examples are shown in FIG.

[0026] Figure numerals: 1 - tread rubber, 11 - first tread rubber, 12 - second tread rubber, 13 - third tread rubber, 14 - fourth tread rubber, 15 - fifth tread rubber, 2 - base rubber, 3 - shoulder rubber, 4 - conductive rubber. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1 like Figure 2 The tread rubber profile of the asymmetric rubber structure shown in the figure comprises a tread rubber 1, a base rubber 2 and a shoulder rubber 3. The tread rubber 1 and the base rubber 2 are arranged in sequence from the outside to the inside to constitute a tread layer; the tread rubber 1 comprises five tread rubber areas from left to right, which are the first tread rubber 11, the second tread rubber 12, the third tread rubber 13, the fourth tread rubber 14 and the fifth tread rubber 15, that is, the first tread rubber 11 is located on the outside of the tire loading, and the fifth tread rubber 15 is located on the inside; the shoulder rubber 3 is arranged on both lateral sides of the tread layer.

[0029] The first tread rubber 11 adopts a rubber composition A with low wear and high grip, and a Shore A hardness of 66-70; the third tread rubber 13 and the fourth tread rubber 14 adopt a rubber composition B with low rolling resistance, and a Shore A hardness of 64-68, and tanδ≤0.10 at 60°C; the second tread rubber 12 and the fifth tread rubber 15 adopt a rubber composition C with high wet grip and low noise, and a Shore A hardness of 62-66.

[0030] like Figure 2As shown, the thickness of the first tread rubber 11 and the fifth tread rubber 15 is 7.0 mm, and the thickness of the second tread rubber 12, the third tread rubber 13, and the fourth tread rubber 14 is 6.0 mm; the thickness of the base rubber 2 accounts for 10% of the thickness of the tread layer; the shoulder rubber 3 is a rubber strip with an obtuse triangle cross section, which is spliced ​​and arranged on both sides of the tread layer, and the height of the shoulder rubber 3 is 0.7 times the center height of the tread layer. The tread shoulder of the present invention is designed in a slope form, and adopts a thinning design, which can reduce the heat generation and shoulder energy loss of the tire shoulder part, and at the same time reduce the heat generation of the tire finished tread part, and improve the durability.

[0031] The rubber composition A is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 20 parts of natural rubber, 15 parts of high cis-butadiene rubber, 20 parts of solution polymerized styrene-butadiene rubber A, 45 parts of solution polymerized styrene-butadiene rubber B, 50 parts of white carbon black, 30 parts of super wear-resistant carbon black, 4.0 parts of silane coupling agent TESPT, 2.0 parts of white carbon black dispersant, 8.0 parts of alpha-methyl styrene resin, 2.0 parts of zinc oxide, 2.0 parts of stearic acid, 2.0 parts of antioxidant 6PPD, 1.5 parts of microcrystalline wax, 1.0 parts of sulfur, 2.0 parts of accelerator CZ, and 0.5 parts of accelerator TBzTD.

[0032] Among them, the styrene in solution polymerized styrene butadiene rubber A accounts for 25% of the total weight of solution polymerized styrene butadiene rubber A, and the mass of vinyl accounts for 55% of the total weight of butadiene; the styrene in solution polymerized styrene butadiene rubber B accounts for 36% of the total weight of solution polymerized styrene butadiene rubber A, and the mass of vinyl accounts for 40% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of white carbon black is 200m 2 / g; the particle size of super wear-resistant carbon black is 10-22nm.

[0033] Among them, solution polymerized styrene butadiene rubber A is Sumitomo Chemical solution polymerized styrene butadiene rubber SE0212; solution polymerized styrene butadiene rubber B is LG Chemical F3626; white carbon black is Solvay high dispersion 200MP, with a nitrogen adsorption specific surface area (BET) of 200m 2 / g; the super wear-resistant carbon black is N134, and the particle size is 10-22nm.

[0034] The rubber composition B is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 70 parts of solution-polymerized styrene-butadiene rubber C, 30 parts of modified lithium-based butadiene rubber, 10 parts of carbon black, 70 parts of highly dispersed white carbon black, 6.0 parts of mercaptosilane coupling agent, 2.5 parts of white carbon black dispersant, 3.0 parts of zinc oxide, 2.0 parts of stearic acid, 2.5 parts of antioxidant 6PPD, 1.5 parts of microcrystalline wax, 1.5 parts of sulfur, and 2.0 parts of accelerator NS.

[0035] Among them, styrene in solution polymerized styrene butadiene rubber C accounts for 25% of the total weight of solution polymerized styrene butadiene rubber C, and the weight of vinyl accounts for 40% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of highly dispersed white carbon black is 160m 2 / g; carbon black particle size is 20-30nm.

[0036] The solution polymerized styrene butadiene rubber C is HPR355 from JSR Chemicals; the highly dispersed silica is Solvay silica 1165MP, with a nitrogen adsorption specific surface area (BET) of 160 m 2 / g; carbon black is N234, and the particle size is 20-30nm.

[0037] The rubber composition C is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 80 parts of solution-polymerized styrene-butadiene rubber B, 20 parts of neodymium-based butadiene rubber, 5 parts of carbon black, 90 parts of highly dispersed white carbon black, 8.0 parts of silane coupling agent TESPT, 2.5 parts of white carbon black dispersant, 2.2 parts of zinc oxide, 2.0 parts of stearic acid, 3.0 parts of antioxidant 6PPD, 2.0 parts of microcrystalline wax, 1.5 parts of sulfur, and 2.0 parts of accelerator NS.

[0038] Among them, the styrene in solution polymerized styrene butadiene rubber B accounts for 36% of the total weight of solution polymerized styrene butadiene rubber A, and the weight of vinyl accounts for 40% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of white carbon black is 160m 2 / g; carbon black particle size is 20-30nm.

[0039] Among them, the solution polymerized styrene butadiene rubber B is LG Chemical F3626; the highly dispersed silica is Solvay silica 1165MP, and the nitrogen adsorption specific surface area (BET) is 160m 2 / g; carbon black is N234, and the particle size is 20-30nm.

[0040] The tread rubber molding method of the present invention is as follows: rubber composition A, rubber composition B, rubber composition C, base rubber 2, and shoulder rubber 3 are respectively fed through the rubber inlets of their respective screw extruders, then extruded through their respective screw extruders and runners, pressed out through a pre-die component and arranged into a preset shape, and finally passed through an extrusion die component together to compositely extrude an asymmetric tread.

[0041] like Figure 3 As shown, a tire comprises a tread portion, a sidewall portion, a belt portion and a bead portion, wherein the tread portion is prepared by vulcanizing the tread rubber.

[0042] Table 1 Comparison of rheological and physical properties of rubber compositions A, B, and C In the above Table 1, tensile strength*elongation at break is the tensile product of the rubber compound: the higher the value, the better the reinforcement of the rubber compound; 300% elongation stress is related to the deformation resistance of the rubber compound: the higher the value, the higher the hardness; tanD at 0℃: characterizes the wet braking performance of the tire, the higher the value, the better the tire's anti-skid performance; tanD at 20℃: characterizes the dry braking performance of the tire, the higher the value, the better; 20℃ composite modulus E * : Characterizes the stiffness of the rubber. The higher the value, the stronger the tread rubber stiffness, usually the better the tire handling and the stronger the tire cornering handling performance; tanD at 60°C: Characterizes the tread rolling resistance performance. The lower the value, the lower the rolling resistance performance.

[0043] Dynamic Mechanical Analyzer (DMA) test conditions (tensile mode): pre-strain 7%, dynamic strain 0.25%, 12HZ.

[0044] Comparative Example 1 A tire with a four-composite tread rubber, which is different from Example 1 in that the tread of the tire is made of Figure 1 The traditional tread rubber structure shown in the figure; the tread rubber adopts the intermediate tread rubber compound formula of Example 1 of Chinese invention patent CN118769767A, and the other specifications are the same as Example 1.

[0045] Comparative Example 2 A tire with a five-composite tread with different rubber structures is different from Example 1 in that the tread rubber structure and rubber material of the tire are the same as those of Example 2 in Chinese invention patent CN118769767A, and the other specifications are the same as those of Example 1.

[0046] Performance Testing According to the relevant national standard test method, the tires of Example 1 and Comparative Examples 1 and 2 were subjected to indoor performance tests. All test results were calculated based on Comparative Example 1 as 100. Test value (relative value) = actual test value / actual test value of Comparative Example 1 × 100. The specific measurement results are shown in Table 2. The trial-produced tire specification is 235 / 45R18.

[0047] Table 2 Physical properties Comparative Example 1 Comparative Example 2 Example 1 Dry braking 100 105 109 Dry handling 100 107 108 Wet braking 100 103 106 Wet handling 100 105 106 wear and tear 100 102 104 Comfort 100 101 104 Rolling resistance 100 102 100 It can be seen from Table 2 that the high speed, durability, rolling resistance and other performances of Example 1 all meet the standards, and are more excellent in dry braking, wet braking and comfort performance, with balanced overall performance.

[0048] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A tread rubber with a dislocated rubber structure, characterized in that: The tread rubber comprises a tread rubber (1), a base rubber (2) and a shoulder rubber (3), wherein the tread rubber (1) and the base rubber (2) are arranged in sequence from the outside to the inside to form a tread layer; the tread rubber (1) comprises five tread rubber areas from left to right, namely, a first tread rubber (11), a second tread rubber (12), a third tread rubber (13), a fourth tread rubber (14) and a fifth tread rubber (15); the shoulder rubber (3) is arranged on both lateral sides of the tread layer; The first tread rubber (11) is made of a low-wear, high-grip rubber composition A, with a Shore A hardness of 66-70, a 300% elongation stress of 11.0-13.0.0 MPa, a tanD of ≥0.35 at 0°C, a tanD of ≥0.22 at 20°C, and a composite modulus of E at 20°C. * >18.0MPa, tanD is between 0.15-0.18 at 60℃, and the glass transition temperature Tg of the rubber is 12-18℃; The third tread rubber (13) and the fourth tread rubber (14) are made of a low rolling resistance rubber composition B, with a Shore A hardness of 64-68, a 300% elongation stress of 10.0-12.0.0 MPa, tanD ≥ 0.30 at 0°C, tanD ≤ 0.18 at 20°C, and a composite modulus E at 20°C. * 14.0-18.0MPa, tanD≤0.10 at 60℃, and the glass transition temperature Tg of the rubber is 16-24℃; The second tread rubber (12) and the fifth tread rubber (15) are made of a rubber composition C with high wet grip and low noise, with a Shore A hardness of 62-66, a 300% elongation stress of 8.0-10.0.0 MPa, a tanD ≥ 0.45 at 0°C, a tanD of 0.14-0.18 at 20°C, and a composite modulus E at 20°C. * It is 12.0-15.0MPa, tanD is 0.12-0.16 at 60℃, and the glass transition temperature Tg of the rubber is 10-16℃.

2. The tread rubber according to claim 1, characterized in that: The rubber composition A is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 15-30 parts of natural rubber, 10-25 parts of high cis-butadiene rubber, 15-30 parts of solution-polymerized styrene-butadiene rubber A, 40-60 parts of solution-polymerized styrene-butadiene rubber B, 35-55 parts of white carbon black, 25-45 parts of super wear-resistant carbon black, 3.0-5.0 parts of silane coupling agent TESPT, 1.0-3.0 parts of white carbon black dispersant, and 6.0-10 parts of alpha methyl styrene resin; in the solution-polymerized styrene-butadiene rubber A, styrene accounts for 22-28% of the total weight of the solution-polymerized styrene-butadiene rubber A, and the weight of vinyl accounts for 52-58% of the total weight of butadiene; in the solution-polymerized styrene-butadiene rubber B, styrene accounts for 33-39% of the total weight of the solution-polymerized styrene-butadiene rubber A, and the weight of vinyl accounts for 37-43% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of the white carbon black is 190-210 m 2 / g; the particle size of super wear-resistant carbon black is 10-22nm.

3. The tread rubber according to claim 1, characterized in that: The rubber composition B is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 60-80 parts of solution-polymerized styrene-butadiene rubber C, 20-40 parts of low rolling resistance white carbon black modified lithium-based butadiene rubber, 5-15 parts of carbon black, 60-80 parts of highly dispersed white carbon black, 5.0-7.0 parts of mercaptosilane coupling agent, and 1.5-3.5 parts of white carbon black dispersant; in the solution-polymerized styrene-butadiene rubber C, styrene accounts for 22-28% of the total weight of the solution-polymerized styrene-butadiene rubber C, and the weight of vinyl accounts for 37-43% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of the highly dispersed white carbon black is 150-170 m 2 / g; carbon black particle size is 20-30nm.

4. The tread rubber according to claim 1, characterized in that: The rubber composition C is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 70-90 parts of solution-polymerized styrene-butadiene rubber B, 10-30 parts of neodymium-based cis-butadiene rubber, 2-8 parts of carbon black, 80-100 parts of highly dispersed white carbon black, 8.5-9.5 parts of silane coupling agent TESPT, and 1.5-3.5 parts of white carbon black dispersant. In the solution-polymerized styrene-butadiene rubber B, styrene accounts for 33-39% of the total weight of the solution-polymerized styrene-butadiene rubber A, and the weight of vinyl accounts for 37-43% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of the white carbon black is 150-170 m 2 / g; the particle size of super wear-resistant carbon black is 20-30nm.

5. The tread rubber according to claim 1, characterized in that: The rubber composition A is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 20-25 parts of natural rubber, 15-20 parts of high cis-butadiene rubber, 15-25 parts of solution polymerized styrene-butadiene rubber A, 40-50 parts of solution polymerized styrene-butadiene rubber B, 40-50 parts of white carbon black, 25-35 parts of super wear-resistant carbon black, 3.5-4.5 parts of silane coupling agent TESPT, 1.5-2.5 parts of white carbon black dispersant, 7.0-9.0 parts of alpha methyl styrene resin, 1.5-2.5 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 1.5-2.5 parts of antioxidant 6PPD, 1.0-2.0 parts of microcrystalline wax, 1.0-2.0 parts of sulfur, 1.5-2.5 parts of accelerator CZ, and 0.5-1.0 parts of accelerator TBzTD; And / or, the rubber composition B is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 65-75 parts of solution-polymerized styrene-butadiene rubber C, 25-35 parts of butadiene rubber, 8-12 parts of carbon black, 65-75 parts of highly dispersed white carbon black, 5.5-6.5 parts of mercaptosilane coupling agent, 2.0-3.0 parts of white carbon black dispersant, 2.5-3.5 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 2.0-3.0 parts of antioxidant 6PPD, 1.0-2.0 parts of microcrystalline wax, 1.0-2.0 parts of sulfur, and 1.5-2.5 parts of accelerator NS; And / or, the rubber composition C is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 75-85 parts of solution polymerized styrene-butadiene rubber B, 15-25 parts of neodymium-based butadiene rubber, 3-7 parts of carbon black, 85-95 parts of highly dispersed white carbon black, 7.0-9.0 parts of silane coupling agent TESPT, 2.0-3.0 parts of white carbon black dispersant, 1.5-2.5 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 2.5-3.5 parts of antioxidant 6PPD, 1.5-2.5 parts of microcrystalline wax, 1.0-2.0 parts of sulfur, and 1.5-2.5 parts of accelerator NS.

6. The tread rubber according to any one of claims 1 to 5, characterized in that: The super wear-resistant carbon black is N134 or N115; the highly dispersed white carbon black is Solvay 1165MP.

7. The tread rubber according to claim 1, characterized in that: The thickness of the first tread rubber (11) and the fifth tread rubber (15) is 7.0 mm; the thickness of the second tread rubber (12), the third tread rubber (13), and the fourth tread rubber (14) is 6.0 mm; and / or the thickness of the base rubber (2) accounts for 5-15% of the thickness of the tread layer.

8. The tread rubber according to claim 1, characterized in that: The shoulder rubber (3) is a rubber strip with an obtuse triangle cross section, which is spliced ​​and arranged on both lateral sides of the tread layer. The height of the shoulder rubber (3) is 0.6-0.8 times the center height of the tread layer.

9. The method for preparing a tread rubber according to any one of claims 1 to 8, characterized in that: The asymmetric tread is obtained by feeding the rubber composition A, the rubber composition B, the rubber composition C, the base rubber (2), and the shoulder rubber (3) into the rubber inlets of the respective screw extruders, and then extruding them through the respective screw extruders and runners, and then pressing them out through a pre-die component and arranging them into a preset shape, and finally passing through an extrusion die component together to compositely extrude the asymmetric tread.

10. A tire comprising a tread portion, a sidewall portion, a belt portion and a bead portion, characterized in that: The tread part is prepared by vulcanizing the tread rubber according to any one of claims 1 to 8.

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