CN112552567A - Comprehensive ultrahigh-performance summer semi-steel tire tread rubber material and preparation method and application thereof - Google Patents
Comprehensive ultrahigh-performance summer semi-steel tire tread rubber material and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The application provides a comprehensive ultrahigh-performance summer semisteel tire tread rubber material and a preparation method and application thereof, and the comprehensive ultrahigh-performance summer semisteel tire tread rubber material comprises the following components in parts by mass: 50-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-40 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-40 parts of natural rubber, 50-90 parts of silicon dioxide, 5-15 parts of carbon black, 5-30 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator; wherein the total mass part of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber is 100 parts. The tread rubber material provided by the invention has excellent wet skid resistance, wear resistance and low oil consumption performance, meanwhile, the rubber material does not have the problem of rubber scattering in the preparation process, the mutual viscosity of joints of the rubber material is good, and a key technical support is provided for batch preparation of comprehensive ultrahigh-performance summer tire products.
Description
Technical Field
The invention belongs to the field of tire rubber products, and particularly relates to a comprehensive ultrahigh-performance summer semi-steel tire tread rubber material and a preparation method and application thereof.
Background
The tire performance directly influences the speed, safety, comfort and energy conservation of an automobile, and the evaluation of the tire performance mainly has 3 indexes: rolling resistance (fuel consumption performance), wet skid resistance and wear resistance are called as the magic triangles of the tire performance, and the balance of the magic triangles of the tire performance is the research and development hot spot of the current tire technology.
The performance of the high-performance summer semi-steel tire is improved, and the improvement of the wet skid resistance (namely, the wet grip performance) is more concerned. In the prior art, the tread rubber material of the high-performance summer semi-steel tire is mainly provided with two methods for improving the wet skid resistance, wherein one method is to take solution polymerized styrene-butadiene rubber as a main body, increase the using amount of a filler or use a high-hardness filler, improve the capability of the rubber material for puncturing a water film, further improve the friction force between the rubber material and a road surface and improve the wet skid resistance; however, the method can increase the lagging heat generation of the rubber material and is not favorable for low oil consumption performance on one hand, and the mixing and rubber dispersion problem of the rubber material and the non-adhesion problem of joints can be caused by the fully synthetic rubber system matched with a high-dosage filler on the other hand; another method is to use a modified terpene-based anti-wet skid resin to improve the anti-wet skid performance of the tread compound without significantly compromising the low fuel consumption performance of the compound, but such methods reduce the wear resistance of the tread compound.
Therefore, how to effectively balance the performance of the tire, namely the magic triangle, comprehensively improve the wet land gripping performance, the low oil consumption performance and the wear resistance of the high-performance summer semi-steel tire becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the problems that a high-performance summer semisteel tire is difficult to effectively balance the performance of the tire in the prior art, and the wet land gripping performance, the low oil consumption performance and the wear resistance of the summer semisteel tire are difficult to comprehensively improve, the application provides a comprehensive ultrahigh-performance summer semisteel tire tread rubber material to solve the technical problems, and the tread rubber material comprises the following components in parts by mass:
50-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-40 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-40 parts of natural rubber, 50-90 parts of silicon dioxide, 5-15 parts of carbon black, 5-30 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator;
wherein the total mass part of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber is 100 parts.
Preferably, the tread rubber compound comprises the following components in parts by mass:
60-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-30 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-20 parts of natural rubber, 60-80 parts of silicon dioxide, 5-10 parts of carbon black, 10-25 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator;
wherein the total mass part of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber is 100 parts.
Preferably, the functional group of the terminal functionalized modified solution-polymerized styrene-butadiene rubber is a polar group, and the molecular chain of the terminal functionalized modified solution-polymerized styrene-butadiene rubber contains 50-70% of vinyl and 10-30% of bound styrene.
Preferably, the side group content of the styrene-isoprene-butadiene terpolymer integrated rubber is 30-55%.
Preferably, the BET specific surface area of the silicon dioxide is 130-200 m2/g。
Preferably, the specific surface area of the carbon black is 30-150 m2/g。
Preferably, the activating agent is stearic acid and zinc oxide, the stearic acid accounts for 1-3 parts, and the zinc oxide accounts for 2-4 parts.
Accordingly, the present application also provides a method for preparing the above tread compound, comprising the steps of:
(1) plasticating the end-functionalized modified solution-polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber in an internal mixer, wherein the plasticating time is 20-50 seconds, and the rotating speed of the internal mixer is 80-100 rpm;
(2) adding the silicon dioxide, the coupling agent, the liquid plasticizer, the carbon black, the activator, the anti-aging agent and the dispersing agent into the internal mixer for mixing;
(3) when the temperature in the internal mixer reaches 120-125 ℃, lifting a top bolt, and pressing down the top bolt after 5 s;
(4) when the temperature in the internal mixer reaches 145-150 ℃, lifting the upper top bolt again, and pressing down the upper top bolt after 5 seconds;
(5) when the temperature in the internal mixer reaches 155 ℃, reducing the rotating speed of the internal mixer to 50rpm, keeping the temperature in the internal mixer at 155 ℃ for 120-150 s in total, and discharging rubber to obtain rubber compound;
(6) cooling the rubber compound at room temperature, placing the rubber compound in an open mill, adding the vulcanizing agent and the vulcanization accelerator, and mixing;
(7) after being mixed evenly, the mixture is rolled for 4 to 5 times;
(8) and (5) carrying out thin passing for 5-8 times, and then, taking out the rubber sheet to obtain the tread rubber material.
Correspondingly, the application also provides a summer semisteel radial tire which is prepared by using the tread rubber material.
The application provides a comprehensive ultrahigh-performance summer semi-steel tire tread rubber material and a preparation method and application thereof, wherein the tread rubber material comprises the following components in parts by mass: 50-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-40 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-40 parts of natural rubber, 50-90 parts of silicon dioxide, 5-15 parts of carbon black, 5-30 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator; wherein the total mass part of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber is 100 parts. Compared with the prior art, the preparation method utilizes the wet skid resistance and low heat generation property of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the excellent processing performance and comprehensive performance of the styrene-isoprene-butadiene terpolymer integrated rubber, and the excellent mechanical property and self-adhesiveness of the natural rubber, and simultaneously uses a certain mass of silicon dioxide and a small amount of carbon black for filling, so that the magic triangle of the tire performance is effectively balanced and broken through, better gripping force can be provided on a wet road surface, lower oil consumption performance and better wear resistance can be ensured, the processing performance and joint viscosity of the high-performance summer tire tread rubber material can be effectively improved, and a key technical support is provided for the batch preparation of the comprehensive ultrahigh-performance summer tire product.
Detailed Description
Breaking through the 'magic triangle' of tire performance requires the optimized compounding of various materials in the tire tread formula, wherein a rubber system plays a decisive role. According to the method, the tail-end functionalized modified solution-polymerized styrene-butadiene rubber and the styrene-isoprene-butadiene terpolymer integrated rubber with the optimal structure are introduced, and the tail-end functionalized modified solution-polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber, the natural rubber and the silicon dioxide are compounded and optimized, so that the unique performance advantages of the three types of rubber are comprehensively utilized to the greatest extent, the magic triangles of the tire performance are effectively balanced and broken through, meanwhile, the rubber material does not have the problem of rubber dispersion in the preparation process, the joint mutual viscosity of the rubber material is good, and the problem of poor joint viscosity of the current tire tread rubber material in summer is effectively improved.
Specifically, aiming at the defects of the prior art, the application provides a comprehensive ultrahigh-performance summer semi-steel tire tread rubber material which comprises the following components in parts by mass:
50-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-40 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-40 parts of natural rubber, 50-90 parts of silicon dioxide, 5-15 parts of carbon black, 5-30 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator.
In order to further improve the properties of the tread compound, in a preferred embodiment of the present application, the tread compound comprises the following components in parts by mass:
60-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-30 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-20 parts of natural rubber, 60-80 parts of silicon dioxide, 5-10 parts of carbon black, 10-25 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator.
Wherein the total mass part of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber is 100 parts. The natural rubber has unique comprehensive mechanical property and excellent self-adhesiveness, and can effectively solve the problem of joint stickiness of the tread rubber material of the semi-steel tire in summer.
In a preferred embodiment of the present application, the functional group of the terminal-functionalized modified solution-polymerized styrene-butadiene rubber is a polar group, and the molecular chain of the terminal-functionalized modified solution-polymerized styrene-butadiene rubber has a vinyl content of 50% to 70% and a bound styrene content of 10% to 30%.
Among them, the end-functionalized modified solution-polymerized styrene-butadiene rubber may be classified into a single-end-functionalized modified solution-polymerized styrene-butadiene rubber and a double-end-functionalized modified solution-polymerized styrene-butadiene rubber, and the functional group may be further preferably a hydroxyl group, an amine group and a siloxane group. The current solution polymerized styrene-butadiene rubber is increasingly applied to semisteel radial tires by virtue of excellent wet skid resistance, the end functionalized modified solution polymerized styrene-butadiene rubber can further increase the interface effect with fillers, particularly silicon dioxide (white carbon black), the dispersion of the white carbon black is improved, and the wet skid resistance advantage and the low oil consumption performance advantage are further improved.
In a preferred embodiment of the present application, the styrene-isoprene-butadiene terpolymer integrated rubber has a pendant group content of 30% to 55%.
Among them, styrene-isoprene-butadiene terpolymer integrated rubber (SIBR) has excellent physical properties and dynamic mechanical properties, and its chemical composition and microstructure determine the SIBR performance, among the structural segments of the SIBR, the high cis-1, 4-polybutadiene segment is flexible, providing necessary elasticity, excellent abrasion resistance and low rolling resistance; the cis-1, 4-polyisoprene chain segment provides excellent low-temperature performance, low hysteresis performance and processability, so that the problem of rubber scattering in the processing of the tire tread rubber material of the high-performance summer tire can be effectively solved; the polystyrene segments are rigid and provide good grip braking performance.
Advantages in the present applicationIn an embodiment, the BET specific surface area of the silicon dioxide is 130-200 m2(ii) in terms of/g. The silicon dioxide in the application is specifically high-dispersion white carbon black, and the BET specific surface area of the silicon dioxide can be further preferably 160-180 m2/g。
The specific surface area of the carbon black is 30-150 m2A specific ratio of 40 to 100m2/g。
The dispersant is preferably dispersant ST.
The activating agent is stearic acid and zinc oxide, the Stearic Acid (SA) accounts for 1-3 parts, and the zinc oxide (ZnO) accounts for 2-4 parts, and indirect-zinc oxide is preferred.
In the following, the technical solutions in the present application will be further described clearly and completely with reference to specific embodiments, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples 1 to 4 and comparative example 1 the main materials and amounts thereof were as shown in table 1, according to the ratios of the components in table 1, setting the rotation speed of the internal mixer to 80rpm, the initial temperature in the internal mixer to 60 ℃, plasticating the end-functionalized modified solution-polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber in the internal mixer for 40 seconds, then feeding the silica (highly dispersed silica), the coupling agent, the liquid plasticizer, the carbon black (N330), the zinc oxide (indirect method), the stearic acid SA, the antioxidant and the dispersant ST into the internal mixer for mixing until the temperature in the internal mixer reaches 125 ℃, lifting the ram for 5 seconds, then pressing down the ram, lifting the ram again when the temperature in the internal mixer is 145 ℃, pressing down the ram after 5 seconds, when the temperature in the internal mixer reaches 155 ℃, reducing the rotating speed to 50rpm, keeping the temperature at 155 ℃ for 120s in total, and discharging rubber to obtain a section of rubber compound; standing and cooling the first-stage rubber compound for 8 hours at room temperature, adding a vulcanizing agent (sulfur powder) and an accelerator on a double-roller open mill, mixing until all components are dispersed into the rubber compound, rolling the rubber compound for 5 times, adjusting the roller distance to 2mm, performing thin passing for 5 times, and then discharging to obtain final rubber compound, namely the summer semi-steel tire tread rubber compound with comprehensive ultrahigh performance.
TABLE 1 amounts of the respective components of examples 1 to 4 and comparative example 1 (unit: mass fraction phr)
The summer semi-steel tire tread rubber materials prepared in the examples 1 to 4 and the comparative example 1 are vulcanized for 30min at 151 ℃, and then the test results of the mechanical property and the wear resistance of the rubber materials are shown in the table 2.
TABLE 2 results of mechanical and abrasion resistance tests of samples of examples 1 to 4 and comparative example 1
| Comparative example 1 | Example 1 | Example 2 | Example 3 | Example 4 | |
| Hardness of | 64.6 | 63 | 61.9 | 61.1 | 60.4 |
| Tensile strength/MPa | 16.5 | 18.9 | 16.8 | 16 | 16.6 |
| Elongation at break/%) | 472 | 414 | 387 | 360 | 363 |
| M300/MPa | 9.5 | 12.7 | 12.2 | 12.7 | 12.9 |
| M100/MPa | 2.5 | 2.7 | 2.6 | 2.7 | 2.6 |
| Rebound at 100 DEG C | 66.1 | 70.8 | 71.6 | 72.6 | 74.7 |
| DIN abrasion resistance index | 91 | 134 | 136 | 133 | 140 |
As can be seen from the data in table 2: compared with the comparative example 1, in the examples 1 to 5, along with the compound optimization of the end-functionalized modified solution-polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber, the natural rubber and the high-dispersion white carbon black, the resilience at the temperatures of M300, M100 and 100 ℃ of the rubber material is obviously improved, more importantly, the DIN abrasion index of the rubber material is greatly improved, the amplification can reach 53.8%, the abrasion resistance of the optimized tread rubber material of the semi-steel tire in summer is obviously improved, and the abrasion resistance of the rubber material in the example 4 is the best.
The summer semi-steel tire tread rubber materials prepared in the examples 1 to 4 and the comparative example 1 are vulcanized for 30min at 151 ℃, and then the dynamic mechanical property of the rubber materials is tested by a dynamic thermal mechanical analyzer DMA, and the test results are shown in Table 3.
TABLE 3 results of dynamic mechanical Properties test of samples of examples 1 to 4 and comparative example 1
| Comparative example 1 | Example 1 | Example 2 | Example 3 | Example 4 | |
| 0℃tanδ | 0.499 | 0.594 | 0.694 | 0.818 | 0.932 |
| 25℃tanδ | 0.202 | 0.207 | 0.219 | 0.263 | 0.262 |
| 60℃tanδ | 0.137 | 0.116 | 0.109 | 0.111 | 0.092 |
In DMA test data of the rubber material, the higher the value of tan delta at 0 ℃, the higher the wet skid resistance of the rubber material; the higher the value of tan delta at 25 ℃, the better the dry grip of the compound, i.e. the higher the dry braking performance; the lower the value of tan delta at 60 ℃, the lower the hysteresis heat of the compound, i.e. the better the fuel economy performance.
As can be seen from the data in table 3: compared with the comparative example 1, in the examples 1 to 4, along with the compound optimization of the end-functionalized modified solution-polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber, the natural rubber and the high-dispersion white carbon black, the wet skid resistance of the tread rubber material of the semi-steel tire in summer is greatly improved, and the increase is 19.2 to 86.9 percent; the dry grip performance is improved to different degrees, and the maximum amplification can reach 30.2 percent; the hysteresis heat generation of the rubber material is obviously reduced, the reduction amplitude is 15.5-32.8%, and the low oil consumption performance of the semi-steel tire in summer can be effectively improved by using the tread rubber material. Overall, the dynamic mechanical properties of example 4 are best combined.
Comprehensive analysis of the data in tables 2 and 3 shows that: according to the comprehensive ultrahigh-performance summer semi-steel tire tread rubber material provided by the invention, the compounding optimization of the use amounts of the tail end functionalized modified solution-polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene ternary polymerization integrated rubber, the natural rubber and the high-dispersion white carbon black is adopted, so that the 'magic triangle' of the current high-performance summer semi-steel tire tread rubber material is broken through, the wet-grabbing resistance of the rubber material is greatly improved, the wear resistance of the rubber material is greatly improved, and the hysteresis heat of the rubber material is also obviously reduced.
Meanwhile, the ultrahigh-performance summer semi-steel tread rubber material has no problem of rubber scattering in the preparation process, the joint mutual viscosity of the rubber material is good, the problem of poor joint viscosity of the current summer tire tread rubber material is effectively solved, and a key technical support is provided for batch preparation of comprehensive ultrahigh-performance summer tire products.
The above disclosure is only illustrative of the embodiments of the present invention, and is not intended to limit the present invention in any way, and any methods and materials similar or equivalent to those described herein can be used in the method of the present invention. The preferred embodiments and materials described herein are exemplary only, and the embodiments of the present application are not intended to be limited thereto, since modifications and variations of the disclosed embodiments may occur to those skilled in the art and are intended to be included within the scope of the appended claims. The above sequence numbers are for illustrative purposes only and do not represent the relative merits of the implementation scenario. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention, without departing from the technical solution of the present invention, still belong to the protection scope of the technical solution of the present invention.
Claims (9)
1. The comprehensive ultrahigh-performance summer semi-steel tire tread rubber material is characterized by comprising the following components in parts by mass:
50-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-40 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-40 parts of natural rubber, 50-90 parts of silicon dioxide, 5-15 parts of carbon black, 5-30 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator;
wherein the total mass part of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber is 100 parts.
2. The tread compound of claim 1, comprising the following components in parts by mass:
60-80 parts of terminal functionalized modified solution-polymerized styrene-butadiene rubber, 10-30 parts of styrene-isoprene-butadiene terpolymer integrated rubber, 10-20 parts of natural rubber, 60-80 parts of silicon dioxide, 5-10 parts of carbon black, 10-25 parts of liquid plasticizer, 4-7 parts of coupling agent, 2-5 parts of dispersing agent, 2-7 parts of anti-aging agent, 3-7 parts of activating agent, 1-2.5 parts of vulcanizing agent and 2-4.5 parts of vulcanization accelerator;
wherein the total mass part of the terminal functionalized modified solution polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber is 100 parts.
3. The tread compound of claim 1, wherein the functional group of the end-functionalized modified solution-polymerized styrene-butadiene rubber is a polar group, and the molecular chain of the end-functionalized modified solution-polymerized styrene-butadiene rubber has a vinyl content of 50% to 70% and a bound styrene content of 10% to 30%.
4. The tread compound of claim 1, wherein the styrene-isoprene-butadiene terpolymer integrated rubber has a pendant group content of from 30% to 55%.
5. The tread compound of claim 1, wherein the silica has a BET specific surface area of 130 to 200m2/g。
6. The tread compound of claim 1, wherein the carbon black has a specific surface area of 30 to 150m2/g。
7. The tread compound of claim 1, wherein the activator is stearic acid and zinc oxide, wherein the stearic acid is present in an amount of 1 to 3 parts and the zinc oxide is present in an amount of 2 to 4 parts.
8. A method of preparing a tread compound according to claims 1 to 7, characterized in that the method comprises the steps of:
(1) plasticating the end-functionalized modified solution-polymerized styrene-butadiene rubber, the styrene-isoprene-butadiene terpolymer integrated rubber and the natural rubber in an internal mixer, wherein the plasticating time is 20-50 seconds, and the rotating speed of the internal mixer is 80-100 rpm;
(2) adding the silicon dioxide, the coupling agent, the liquid plasticizer, the carbon black, the activator, the anti-aging agent and the dispersing agent into the internal mixer for mixing;
(3) when the temperature in the internal mixer reaches 120-125 ℃, lifting a top bolt, and pressing down the top bolt after 5 s;
(4) when the temperature in the internal mixer reaches 145-150 ℃, lifting the upper top bolt again, and pressing down the upper top bolt after 5 seconds;
(5) when the temperature in the internal mixer reaches 155 ℃, reducing the rotating speed of the internal mixer to 50rpm, keeping the temperature in the internal mixer at 155 ℃ for 120-150 s in total, and discharging rubber to obtain rubber compound;
(6) cooling the rubber compound at room temperature, placing the rubber compound in an open mill, adding the vulcanizing agent and the vulcanization accelerator, and mixing;
(7) after being mixed evenly, the mixture is rolled for 4 to 5 times;
(8) and (5) carrying out thin passing for 5-8 times, and then, taking out the rubber sheet to obtain the tread rubber material.
9. A summer semi-steel radial tire prepared using the tread compound of any one of claims 1-7.
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