Tire tread rubber composition with ultralow rolling resistance and cutting resistance and preparation method thereof

Abstract

The invention provides a tire tread rubber composition with ultralow rolling resistance and cutting resistance and a preparation method thereof, and belongs to the technical field of tire rubber. According to the ultralow-rolling-resistance and cutting-resistant tire tread rubber composition provided by the invention, tetrazine ring compound modified natural rubber white carbon black masterbatch, highly branched solution polymerized styrene-butadiene rubber and butadiene rubber form a ternary rubber system with longitudinal and transverse networks, and then a P-N heterocyclic ring is used as a self-assembly bridge to load a coupling agent on the surface of an aramid short fiber; redundant active groups of the short fibers are sealed to reduce self-agglutination, and a formed fiber-white carbon black system can effectively reduce self-agglomeration of the white carbon black and the fibers to improve the dispersion of the filler. The obtained rubber composition has the characteristics of ultralow rolling resistance and cutting resistance, the cutting resistance is improved while the endurance of a new energy automobile is guaranteed, the risk of pattern chipping is avoided, and the service life of a tire is further prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of tire rubber, and in particular relates to an ultra-low rolling resistance, cut-resistant tire tread rubber composition and a preparation method thereof. Background Art

[0002] The exhaust and particulate matter emissions of traditional fuel vehicles have a serious impact on the air and human health. In order to further develop the sustainable development and improve the quality of the atmospheric environment, exhaust-free new energy vehicles have been able to flourish. With the continuous innovation of technology, new energy vehicles are gradually becoming popular, and are even evolving towards autonomous driving. However, the high load and instantaneous torque unique to new energy vehicles also place higher demands on the durability of tires. As we all know, low rolling resistance tires are one of the important means to extend the driving range. Today, major new energy vehicle companies have strict requirements on the rolling resistance performance of tires. However, the lower the rolling resistance of the tire, the lower the cohesive energy inside the tire. The weak interaction force inside the rubber is prone to the risk of falling off, which reduces the durability of the tire.

[0003] Existing low rolling resistance tire technologies mainly focus on methods such as modified solution-polymerized styrene-butadiene rubber, application of super silane coupling agents, reducing the proportion of fillers, and applying corresponding modifiers. The main principles are to improve filler dispersion, reduce intermolecular entanglement, increase rubber flexibility, etc., but they cannot avoid the possibility of tread block loss. In particular, new energy vehicles have the characteristics of large instantaneous torque of the motor and heavy weight, which further increases the risk of tire block loss. Although it extends the battery life, it reduces the durability of the tire. At present, the technology to enhance the cut resistance of tires is to use solution-polymerized styrene-butadiene rubber or tear-resistant resin with a high styrene structure to increase molecular chain entanglement and further enhance cohesion, which undoubtedly has a certain impact on the rolling resistance of the tire. Summary of the invention

[0004] The present invention provides an ultra-low rolling resistance and cut-resistant tire tread rubber composition and a preparation method thereof. The rubber composition has the characteristics of ultra-low rolling resistance and cut-resistant performance, which improves the cut-resistant performance while ensuring the endurance of new energy vehicles, avoids the risk of pattern block falling, and further prolongs the service life of the tire.

[0005] In order to achieve the above-mentioned object, the present invention provides an ultra-low rolling resistance and cut-resistant tire tread rubber composition, comprising a raw rubber system consisting of highly branched modified solution-polymerized styrene-butadiene rubber, a natural rubber white carbon black masterbatch modified by a tetrazine ring compound, and a high-cis neodymium-based butadiene rubber, and a reinforcement system consisting of white carbon black and aramid staple fibers modified by PN heterocyclic rings containing siloxane functional groups, wherein the aramid staple fibers improve the cut resistance while ensuring the rolling resistance by promoting the dispersion of white carbon black and participating in the further reaction of the rubber main molecular chain and the tetrazine ring compound.

[0006] Preferably, the raw rubber system comprises, by weight, 30-50 parts of highly branched modified solution-polymerized styrene-butadiene rubber, 30-60 parts of natural rubber silica masterbatch modified by tetrazine ring compounds, 10-20 parts of high-cis neodymium-based butadiene rubber, and a reinforcement system comprising 30-60 parts of silica and 2-10 parts of aramid staple fibers modified with PN heterocycles.

[0007] As a preferred embodiment, the styrene content of the highly branched modified solution polystyrene butadiene rubber is 20-30% of the total mass, the vinyl content is 15-25%, and the number average molecular weight is (40-80)×10 -4 It can be understood that the multi-linear molecular chains of the highly branched modified solution polystyrene butadiene rubber can be six-arm or multi-arm branches as branches, and more branches can increase the three-dimensional network structure of the rubber, increase the viscoelasticity and raw rubber strength of the rubber, and thus improve the interaction between the rubber and the filler.

[0008] Preferably, the highly branched modified solution polymerized styrene butadiene rubber is HS256 solution polymerized styrene butadiene rubber.

[0009] In the above scheme, highly branched modified solution polymerized styrene butadiene rubber, natural rubber silica masterbatch modified by tetrazine ring compounds and high cis-neodymium butadiene rubber are used as the ternary blended rubber system to construct a network structure with crisscrossing branches. The highly branched modified solution polymerized styrene butadiene rubber does not increase the entanglement of molecular chains due to the increase in the number of ends. Unlike most ends of long molecular chains, the ends are more conducive to dispersing and grasping silica, thereby promoting the dispersion of fillers and further reducing rolling resistance.

[0010] Preferably, the tetrazine ring compound modifier is DS-01 modifier, and its structural formula is as follows:

[0011]

[0012] It is understandable that white carbon black is a polar filler and is difficult to disperse in non-polar natural rubber, so tetrazine ring compounds are used to modify and prepare natural rubber. In this case, the double bond structure of the tetrazine ring can react with the double bond structure in the NR molecular chain and graft onto the rubber molecular chain. At the same time, the side chains R1 and R2 on the tetrazine ring are siloxane or amine groups, which can further react with white carbon black to further improve the dispersion of white carbon black in the system. In addition, the introduction of tetrazine rings for modification can also improve the binding force between white carbon black and natural rubber. The unique crystallinity of natural rubber has a certain inhibitory effect on crack propagation, further ensuring rolling resistance and improving cutting resistance.

[0013] Preferably, the method for modifying natural rubber with tetrazine ring compounds is as follows: 100 parts of natural rubber and 20 parts of white carbon black are added into an intermeshing internal mixer with an initial speed of 80 rpm. After heating to 110°C, tetrazine ring modifier DS-01 is added, and the mixture is mixed for 120 seconds and then discharged for use.

[0014] Preferably, the aramid staple fiber is an aromatic para structure.

[0015] In order to further improve the dispersion of aramid staple fibers in the rubber system, they are subjected to ultrasonic pretreatment, and 2-8 parts by weight of PN heterocyclic small molecule polymer containing siloxane functional groups are soaked in a polar organic solvent at 60° C. for 5 hours to form a polymer coating.

[0016] The carbonyl oxygen of the amide bond on the aramid staple fiber can react chemically with the siloxane group of the highly active silane coupling agent─Si(OCH2CH3); at the same time, the polysiloxane group of the silane coupling agent can also undergo a condensation reaction with the hydroxyl group on the surface of silica. In this way, the coupling agent is loaded on the fiber surface using the PN heterocycle as a self-assembly bridge to form a fiber-silica to further reduce the agglomeration of silica and improve the dispersion of the filler. The thiol or S-containing functional group at the other end of the PN heterocyclic silane coupling agent can react and cross-link with the ternary rubber to combine the modified fiber filler and the ternary rubber system into a whole. At the same time, the lone pair of electrons on the N atom of the tetrazine ring and the lone pair of electrons of the N of the PN heterocycle form hydrogen bonds through the -OH group after hydrolysis on the silica to further strengthen the interaction between the filler and the rubber, thereby enhancing the interaction between the rubber-fiber-silica, ensuring rolling resistance while improving the cutting resistance, such as Figure 1 shown.

[0017] Preferably, the siloxane functional group is selected from at least one of Si-69, Si-75 and NXT.

[0018] Preferably, the composition further comprises 2-4 parts of a vulcanizing agent and 2-6 parts of an accelerator, by weight, wherein the vulcanizing agent is sulfur and the accelerator is N-cyclohexyl-2-benzothiazole xanthamide.

[0019] As a preferred embodiment, the CTAB specific surface area of ​​white carbon black is 160 m 2 / g.

[0020] Preferably, the rolling resistance Tanδ at 60°C of the obtained tire tread rubber composition is increased by more than 5%, and the cut resistance is increased by more than 20%.

[0021] The present invention also provides a method for preparing the tire tread rubber composition according to any one of the above technical solutions, comprising the following steps:

[0022] A raw rubber system consisting of highly branched modified solution polymerized styrene-butadiene rubber, a natural rubber white carbon black masterbatch modified by a tetrazine ring compound, and a high-cis neodymium-based butadiene rubber, and a reinforcement system consisting of white carbon black and aramid staple fibers modified by PN heterocyclic rings containing siloxane functional groups are added into an internal mixer for dry mixing to obtain a masterbatch;

[0023] A masterbatch, an accelerator and a vulcanizing agent are added to an internal mixer for compression mixing or discharged to a lower sheet of an open mixer at 100-110° C. and cooled to obtain a tire tread rubber composition.

[0024] Preferably, the above method can be specifically operated as follows:

[0025] First stage masterbatch: use a meshing internal mixer with an initial speed of 90rpm. Add the raw rubber system consisting of highly branched solution polymerized styrene-butadiene rubber, natural rubber white carbon black masterbatch modified by tetrazine ring compounds, butadiene rubber, and the reinforcement system consisting of white carbon black and aramid staple fibers modified by PN heterocyclics containing siloxane functional groups into the internal mixer for dry mixing, press the plug and mix to 145℃, keep the temperature constant for 120s; lift the plug; add antioxidant and activator and press the plug and mix for 40s; lift the plug, speed 80rpm, press the plug, continue for 30s; open the discharge door to discharge the rubber to the lower sheet of the open mixer, and cool.

[0026] Final rubber mixing: Mix a masterbatch, accelerator and vulcanizer in an internal mixer with a plug pressed for 40 seconds; remove the plug and mix for 30 seconds; remove the plug and mix for 50 seconds or at 100-110℃, then discharge the rubber to the lower sheet of the open mixer and cool.

[0027] Preferably, the natural rubber and silica masterbatch modified with tetrazine ring compound is prepared by mixing 100 parts of natural rubber and 20 parts of silica in an intermeshing internal mixer with an initial speed of 80 rpm, heating to 110°C, adding tetrazine ring modifier DS-01, mixing for 120 seconds and discharging for use.

[0028] Compared with the prior art, the advantages and positive effects of the present invention are:

[0029] The ultra-low rolling resistance and cut-resistant tire tread rubber composition provided by the present invention adopts a natural rubber white carbon black masterbatch modified by a tetrazine ring compound and a highly branched solution-polymerized butadiene styrene and butadiene rubber to form a ternary rubber system with a network of vertical and horizontal, and then uses a PN heterocycle as a self-assembly bridge to load a coupling agent on the surface of aramid staple fibers, and the excess active groups of the staple fibers are closed to reduce self-polymerization. The fiber-white carbon black system formed can effectively reduce the agglomeration of white carbon black and the fiber itself and improve the dispersion of fillers. The thiol or S-containing functional group at the other end of the silane coupling agent can react with the ternary rubber to crosslink, and the modified aramid staple fiber filler is combined with the ternary rubber system as a whole, further reducing rolling resistance and improving the cutting resistance of the rubber. The obtained rubber composition has the characteristics of ultra-low rolling resistance and cut resistance, while ensuring the endurance of new energy vehicles, improving cut resistance, avoiding the risk of pattern falling blocks, and further extending the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the PN heterocyclic modified aramid staple fiber containing siloxane functional groups provided by the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0032] Example Rubber Composition

[0033] An ultra-low rolling resistance and cut-resistant tire tread rubber composition comprises a raw rubber system composed of highly branched modified solution-polymerized styrene-butadiene rubber, a natural rubber white carbon black masterbatch modified by a tetrazine ring compound, and a high-cis neodymium-based cis-butadiene rubber, and a reinforcement system composed of white carbon black and PN heterocyclic modified aramid short fibers containing siloxane functional groups, wherein the aramid short fibers promote the dispersion of white carbon black and further react with the rubber main molecular chain and the tetrazine ring compound, thereby improving the cut resistance while ensuring the rolling resistance. The specific models and amounts of each component in Examples 1-5 and Comparative Examples 1-4 are shown in Table 1, wherein the formula components of Comparative Examples 1-2 are existing low rolling resistance and cut-resistant tread rubber composition components.

[0034] Preparation method of rubber composition of Examples 1-5 and Comparative Example 4

[0035] First stage masterbatch: use a meshing internal mixer with an initial speed of 90rpm. Add the raw rubber system consisting of highly branched solution polymerized styrene-butadiene rubber, natural rubber white carbon black masterbatch modified by tetrazine ring compounds, butadiene rubber, and the reinforcement system consisting of white carbon black and aramid staple fibers modified by PN heterocyclics containing siloxane functional groups into the internal mixer for dry mixing, press the plug and mix to 145℃, keep the temperature constant for 120s; lift the plug; add antioxidant and activator and press the plug and mix for 40s; lift the plug, speed 80rpm, press the plug, continue for 30s; open the discharge door to discharge the rubber to the lower sheet of the open mixer, and cool.

[0036] Final rubber mixing: Mix a masterbatch, accelerator and vulcanizer in an internal mixer with a plug pressed for 40 seconds; remove the plug and mix for 30 seconds; remove the plug and mix for 50 seconds or at 100-110℃, then discharge the rubber to the lower sheet of the open mixer and cool.

[0037] Among them, the natural rubber and silica masterbatch modified by tetrazine ring compound: 100 parts of natural rubber and 20 parts of silica, using an intermeshing internal mixer, the initial speed is 80rpm, the temperature is raised to 110℃, the tetrazine ring modifier DS-01 is added, and the mixture is mixed for 120S and discharged for use.

[0038] Comparative Example 1 Preparation method of rubber composition

[0039] According to the amount of each component in Table 1, a rubber composition was prepared by mixing:

[0040] Use a meshing internal mixer with an initial speed of 90rpm. Modified solution polystyrene butadiene rubber M2520, natural rubber, and cis-1,2-butadiene rubber form a raw rubber system, then add white carbon black and silane coupling agent to the internal mixer for dry mixing, press the plug and mix to 145℃, keep the temperature for 120s; lift the plug; add antioxidant and activator and press the plug and mix for 40s; lift the plug, speed 80rpm, press the plug, continue for 30s; open the unloading door to discharge the rubber to the lower sheet of the open mixer, and cool. Final mixing: press the plug and mix a masterbatch, accelerator, and vulcanizer in the internal mixer for 40s; lift the plug, press the plug and mix for 30s; lift the plug, press the plug and mix for 50s or 100-110℃, then discharge the rubber to the lower sheet of the open mixer and cool.

[0041] Comparative Example 2-3 Preparation method of rubber composition

[0042] According to the amount of each component in Table 1, a rubber composition was prepared by mixing process:

[0043] Use a meshing internal mixer with an initial speed of 90rpm. Modified solution polystyrene butadiene rubber M2520, natural rubber, and cis-1,4-butadiene rubber form a raw rubber system, then add white carbon black, silane coupling agent, and aramid staple fiber to the internal mixer for dry mixing, press the plug and mix to 145°C, keep the temperature for 120s; lift the plug; add antioxidant and activator and press the plug and mix for 40s; lift the plug, speed 80rpm, press the plug, continue for 30s; open the unloading door to discharge the rubber to the lower sheet of the open mixer, and cool. Final mixing: press the plug and mix a section of masterbatch, accelerator, and vulcanizer in the internal mixer for 40s; lift the plug, press the plug and mix for 30s; lift the plug, press the plug and mix for 50s or 100-110°C, then discharge the rubber to the lower sheet of the open mixer and cool.

[0044] Table 1 Rubber composition formula and properties

[0045]

[0046] Note: The data in Table 1 has no unit and is a relative value, which is converted based on the sample of Comparative Example 1. Among them, Comparative Example 3 is a low rolling resistance and cut-resistant rubber composition prepared by adding tetrazine ring modified natural masterbatch and highly branched modified solution polystyrene butadiene rubber, and the aramid staple fiber is prepared without special treatment and modification; Comparative Example 4 is the amount of modified aramid staple fiber that exceeds the range ratio. Examples 1-3 are to modify the aramid staple fiber with SI-75, SI-75 functionalized PN heterocyclic modified polymer, and NXT functionalized PN heterocyclic modified polymer in the composition used for modified natural rubber to prepare a low rolling resistance and cut-resistant rubber composition. Among them, the preparation of modified aramid staple fiber in Example 1: the aramid staple fiber needs to be dispersed by ultrasonic pretreatment, and 2-8 parts by weight of silane coupling agent (Si-75) are used in ultrasound, and soaked in a polar organic solvent at 60°C for 5h. Preparation of modified aramid staple fibers in Example 2-3: Aramid staple fibers need to be dispersed by ultrasonic pretreatment, and the phosphorus-nitrogen hybrid polymer functionalized with 2-8 parts by weight of silane coupling agent (Si-75, NXT) is soaked in a polar organic solvent at 60°C for 5 hours to form a coated polymer. The polymer self-assembles on the fiber surface based on the reaction of the carbonyl oxygen of the amide bond of the aramid staple fibers to achieve coating modification of the fibers. Example 4 Reduce the amount of added silica used, and increase the ratio of branched solution-polymerized butadiene styrene and modified silica natural rubber masterbatch. Example 5, further reduce the amount of added silica used, and increase the ratio of modified silica natural rubber masterbatch.

[0047] Combined with the data analysis in Table 1 above, it can be seen that Example 1 adds modified natural rubber masterbatch, highly branched solution-polymerized styrene-butadiene rubber and Si-75 modified aramid staple fibers. The modification of Si-75 reacts with the carbonyl oxygen of the amide bond on the fiber, improves the dispersion of the fiber, and further connects the staple fiber to the rubber-white carbon black. The cutting resistance and abrasion resistance of the rubber compound have been qualitatively improved, and the rolling resistance is comparable to that of Comparative Example 1, which is 4% higher than that of Comparative Example 3, proving that the primary modification of the aramid staple fibers has a certain effect. At the same time, because the addition of modified staple fibers enhances the interaction between the rubber molecular chain and the filler, the cutting resistance of the rubber compound is increased by 8% compared to Comparative Example 3, and the DIN abrasion is increased by 6%.

[0048] In Examples 2 and 3, different silane coupling agents functionalized PN heterocycles to modify the staple fibers. The PN heterocycle polymers blocked the amide bonds and α-H on the staple fibers, further organizing the self-polymerization of the fibers, so that only siloxane groups were expressed on the fiber surface, which helped to react with white carbon black to promote the dispersion of fillers, and the rolling resistance of the rubber was reduced. The results of Examples 2 and 3 were different because of the different S content and molecular weight of the silane coupling agents. NXT had better performance in rolling resistance, which was 11% higher than that of Comparative Example 3, and the cutting resistance was increased by more than 10% compared with Comparative Example 3. Comparative Example 4 increased the amount of NXT functionalized PN heterocycle-modified staple fibers. The increase in the amount and the effect of white carbon black caused some self-polymerization, resulting in a loss of rolling resistance, which was reduced by 5% compared with Example 3.

[0049] In Example 4, the amount of white carbon black is reduced, and the meaningless self-aggregation of white carbon black and short fibers is avoided. The rolling resistance of the rubber is further improved by 10% compared with Comparative Example 3. At the same time, the reduction of the amount of white carbon black added does not lead to a loss of the cutting resistance performance, which is improved by 20% compared with Comparative Example 1. In Example 5, the amount of modified natural rubber masterbatch is increased, and the amount of added white carbon black is further reduced. The introduction of modified natural rubber increases the tensile product of the system, and the cutting resistance of the rubber is improved to 125% compared with Comparative Example 1. At the same time, the white carbon black pre-dispersion in the modified natural rubber masterbatch is sufficient, which further improves the ability to reduce rolling resistance.

[0050] In Comparative Example 2, unmodified aramid staple fibers were added to prepare a low rolling resistance and cut-resistant composition. The aramid staple fibers increased the strength of the rubber compound and increased the tensile product, and the cut resistance was improved by 5%, proving that adding only aramid staple fibers also had a certain effect on the cut resistance. The wear performance was improved by 10%, but due to the dispersion of the aramid staple fibers themselves and the problem of white carbon black, the Payne effect was increased, and the rolling resistance of the rubber compound was reduced by 7% compared with Comparative Example 1.

[0051] Comparative Example 3 adds modified natural rubber masterbatch, highly branched solution-polymerized styrene-butadiene rubber and unmodified aramid staple fibers, which ensures the overall dispersion of white carbon black, and the rolling resistance is improved compared with Comparative Example 2. Because the multi-tentacle connection of highly branched styrene-butadiene rubber and the interaction between modified natural rubber and white carbon black are strengthened, the wear resistance of the rubber is improved. The DIN wear resistance index is increased by 8% compared with Comparative Example 2. The introduction of the ternary rubber system and aramid staple fibers makes the rolling resistance 60℃ Tanδ rise by 4% compared with Comparative Example 2, and the cutting resistance level is consistent; but the self-polymerization of aramid staple fibers still affects the rolling resistance performance.

[0052] From the above analysis, it can be seen that the components in the ultra-low rolling resistance and cut-resistant tire tread rubber composition provided by the present invention have obvious synergistic effects, that is, the white carbon black masterbatch formed by the modification of natural rubber by the modifier tetrazine ring and the highly branched solution-polymerized styrene butadiene rubber form a ternary rubber system with a vertical and horizontal network, and then the coupling agent is loaded on the surface of the aramid staple fiber using the PN heterocycle as a self-assembly bridge, the excess active groups of the staple fiber are blocked to reduce self-polymerization, and the formed fiber-white carbon black system further reduces the agglomeration of white carbon black and the fiber itself and improves the dispersion of the filler. The thiol group or S-containing functional group at the other end of the silane coupling agent can react and crosslink with the ternary rubber, and the modified aramid staple fiber filler and the ternary rubber system are combined into a whole, which cooperates with each other to reduce the rolling resistance while improving the cut resistance of the rubber.

Claims

1. An ultra-low rolling resistance, cut-resistant tire tread rubber composition, characterized in that: It includes a raw rubber system consisting of highly branched modified solution-polymerized styrene-butadiene rubber, natural rubber silica masterbatch modified with tetrazine ring compounds and high-cis neodymium-based butadiene rubber, and a reinforcement system consisting of silica and aramid staple fibers modified with PN heterocyclic rings containing siloxane functional groups. The aramid staple fibers promote the dispersion of silica and participate in the further reaction between the rubber main molecular chain and the tetrazine ring compound, thereby improving the cutting resistance while ensuring the rolling resistance.

2. The tire tread rubber composition according to claim 1, characterized in that: The invention comprises, by weight, a raw rubber system consisting of 30-50 parts of highly branched modified solution-polymerized styrene-butadiene rubber, 30-60 parts of natural rubber white carbon black masterbatch modified by tetrazine ring compounds, 10-20 parts of high-cis neodymium-based butadiene rubber, and a reinforcement system consisting of 30-60 parts of white carbon black and 2-10 parts of aramid staple fibers modified by PN heterocycles.

3. The tire tread rubber composition according to claim 1 or 2, characterized in that: The styrene content of the highly branched modified solution polystyrene butadiene rubber is 20-30% of the total mass, the vinyl content is 15-25%, and the number average molecular weight is (40-80)×10 -4 .

4. The tire tread rubber composition according to claim 3, characterized in that: The highly branched modified solution polymerized styrene butadiene rubber is HS256 solution polymerized styrene butadiene rubber.

5. The tire tread rubber composition according to claim 1 or 2, characterized in that: The tetrazine ring compound modifier is DS-01 modifier.

6. The tire tread rubber composition according to claim 1 or 2, characterized in that: The siloxane functional group is selected from at least one of Si-69, Si-75 and NXT.

7. The tire tread rubber composition according to any one of claims 1 to 6, characterized in that: By weight, the invention also comprises 2-4 parts of a vulcanizing agent and 2-6 parts of an accelerator, wherein the vulcanizing agent is sulfur and the accelerator is N-cyclohexyl-2-benzothiazole xanthamide.

8. The tire tread rubber composition according to claim 1, characterized in that: The CTAB specific surface area of ​​white carbon black is 160m 2 / g.

9. The tire tread rubber composition according to claim 8, characterized in that: The rolling resistance of the obtained tire tread rubber composition at Tanδ at 60°C is increased by more than 5%, and the cutting resistance is increased by 20%.

10. The method for preparing the tire tread rubber composition according to any one of claims 1 to 9, characterized in that: The following steps are involved: A raw rubber system consisting of highly branched modified solution polymerized styrene-butadiene rubber, a natural rubber white carbon black masterbatch modified by a tetrazine ring compound, and a high-cis neodymium-based butadiene rubber, and a reinforcement system consisting of white carbon black and aramid staple fibers modified by PN heterocyclic rings containing siloxane functional groups are added into an internal mixer for dry mixing to obtain a masterbatch; A masterbatch, an accelerator and a vulcanizing agent are added to an internal mixer for compression mixing or discharged to a lower sheet of an open mixer at 100-110° C. and cooled to obtain a tire tread rubber composition.

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