A tire tread rubber composition, a method for producing the same, and a tire

Abstract

This invention discloses a tire tread rubber composition, its preparation method, and a tire, belonging to the field of tire rubber technology. The technical solution includes rubber components, silica, and modifying additives. The modifying additives are prepared by the following method: reacting diphosphoric pentasulfide with an alcohol to generate O,O'-dialkyldithiophosphate; reacting O,O'-dialkyldithiophosphate with chlorosilane in the presence of an acid-binding agent to generate a silane-functionalized dithiophosphate ester intermediate; and reacting the silane-functionalized dithiophosphate ester intermediate with a metal oxide to obtain the modifying additives. This invention, applied to tires, solves the problem of limited promotion and coupling efficiency in existing technologies where dialkyldithiophosphate metal salts and silane coupling agents are physically blended in rubber systems. It can replace DPG while achieving faster vulcanization speed and lower hysteresis loss, and can reduce the amount of silane coupling agent used, which is beneficial for reducing VOC emissions.

Description

Technical Field

[0001] This invention belongs to the field of tire rubber technology, and particularly relates to a tire tread rubber composition, its preparation method, and a tire thereof. Background Technology

[0002] To comply with tire labeling regulations, green tire technology has been promoted. Modified solution-polymerized styrene-butadiene rubber and silica are widely used in the tread formulations of passenger car radial tires, giving them high wet grip and low rolling resistance. Silica is extensively used as a filler in tread compounds. The accelerator DPG can promote the silanization reaction of silica, improve the efficiency of the silanization reaction, adjust the pH of the silica surface, and improve the dispersion of silica. With the increase in silica usage, the amount of DPG in passenger car radial tire tread compounds is also increasing.

[0003] However, the implementation of the EU REACH regulation has also restricted the use of DPG accelerators. This is mainly because DPG decomposes at high temperatures to produce aniline, which is highly harmful to humans and the environment. Meanwhile, the use of silica in the tread rubber of high-performance passenger car radial tires is increasing. High silica adsorption of accelerators slows down the vulcanization process, making the tread a weak point. To ensure finished product performance, the vulcanization time is extended, significantly increasing costs. A contradiction arises when using DPG to balance the vulcanization rate: too much DPG results in an excessively high rubber modulus, which is detrimental to tread chipping and breakage; too little DPG leads to poor silica dispersion, resulting in decreased mechanical and dynamic properties of the rubber compound. Resolving this contradiction is a crucial issue for passenger car treads with high silica usage.

[0004] Dialkyl dithiophosphate zinc, an environmentally friendly sulfur-containing organic zinc salt, has been studied for its potential to replace DPG. The study, "Application of Alkyl Dithiophosphate Zinc in SBR / Silica System," indicates that replacing DPG with an equal amount of TPZ in the SBR / Silica system provides a similar activating effect to DPG, reducing the rolling resistance of the rubber compound. A small amount of TPZ used as a coupling activator in the masterbatch of the SBR / Silica system can reduce the amount of silane coupling agent used, improve filler dispersibility and coupling efficiency. Furthermore, the combined use of dialkyl dithiophosphate zinc and coupling agent Si69 has a synergistic effect on improving the tread rubber's resistance to reversion and reducing the interfacial energy of the filler surface.

[0005] However, in existing technologies, zinc dialkyl dithiophosphate and silane coupling agents are used in combination through physical blending, without forming chemical bonds between them. In this approach, the promoting activity and coupling efficiency of zinc dialkyl dithiophosphate still have room for improvement, and its compatibility with the rubber matrix and its directional anchoring ability on the silica surface are insufficient, limiting further optimization of vulcanization rate and hysteresis loss. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is that the physical blending of zinc dialkyl dithiophosphate and silane coupling agents in rubber systems in existing technologies results in limited promotion and coupling efficiency. This invention proposes a tire tread rubber composition, its preparation method, and a tire that can replace DPG while achieving faster vulcanization speed and lower hysteresis loss, and can reduce the amount of silane coupling agent used, which is beneficial to reducing VOC emissions.

[0007] To solve the aforementioned technical problem, the technical solution adopted by the present invention is as follows: This invention provides a tire tread rubber composition, comprising a rubber component, silica, and a modifying additive, wherein the modifying additive is prepared by the following method: Phosphorus pentasulfide reacts with alcohols to produce O,O'-dialkyldithiophosphoric acid; O,O'-dialkyl dithiophosphate was reacted with chlorosilane in the presence of an acid-binding agent to generate a silane-functionalized dithiophosphate intermediate. Silane-functionalized dithiophosphate intermediates are reacted with metal oxides to obtain modified additives.

[0008] In some embodiments, the chlorosilane is at least one of triethoxychlorosilane, (methoxymethyl)trichlorosilane, or dimethyldichlorosilane.

[0009] In some embodiments, the components include rubber components, silica, silane coupling agents, modifying additives, vulcanizing agents, and other rubber auxiliaries.

[0010] In some embodiments, by weight, the amount of rubber component is 100 parts, the amount of silica is 50-120 parts, the amount of silane coupling agent is 5-8% of the amount of silica, the amount of modifying additive is 1-5% of the amount of silica, and the amount of vulcanizing agent is 0.5-5 parts.

[0011] In some embodiments, the rubber component is selected from at least one of natural rubber, polybutadiene rubber, solution-polymerized styrene-butadiene rubber, and emulsion-polymerized styrene-butadiene rubber; the silica is precipitated silica; the silane coupling agent is a polysulfide alkoxysilane; the vulcanizing agent is selected from sulfur and / or insoluble sulfur; and other rubber additives are selected from at least one of carbon black, processing oil, resin, zinc oxide, stearic acid, antioxidant, accelerator, and scorch inhibitor.

[0012] In some embodiments, the BET specific surface area of ​​silica is 100-300 m². 2 / g.

[0013] In some embodiments, the silane coupling agent is selected from at least one of Si69, Si75, KH-580, NXT, and Si818.

[0014] Another aspect of the present invention provides a method for preparing a tire tread rubber composition according to any of the above technical solutions, comprising: mixing rubber components, silica, silane coupling agent and modifying additives, as well as zinc oxide, stearic acid, carbon black, resin, antioxidant, protective wax and softener in an intensive manner; pressing and mixing the rubber; mixing at a constant temperature; and discharging the rubber into sheets and cooling them to obtain masterbatch. The masterbatch, accelerator, and vulcanizing agent are mixed, then pressed and mixed again after being lifted and pressed, and finally the rubber is discharged, sheeted, and cooled to obtain the final rubber.

[0015] In some embodiments, the rubber component, silica, silane coupling agent, and modifying additives, along with zinc oxide, stearic acid, carbon black, resin, antioxidant, protective wax, and softener, are internally mixed in an internal mixer. The internal mixer rotor speed is 45-60 rpm, and the top bolt pressure is 60 N / cm. 2 The internal mixer is cooled to 40-50℃, and the rubber is pressed and mixed to 135-150℃. It is then kept at this temperature for 120-240 seconds, discharged, and sheeted to obtain the masterbatch. The masterbatch, accelerator, and vulcanizing agent are then added to the internal mixer and mixed for 20 seconds. 40s, internal mixer speed 20 40 rpm; after lifting the plug, press the plug and mix to 90 rpm. 110℃; after debinding and cooling, the final rubber compound is obtained.

[0016] The present invention also provides a tire, the tread of which is made of the tire tread rubber composition of any of the above-described technical solutions.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a tire tread rubber composition in which silane groups are introduced into the molecular structure of dialkyl dithiophosphate metal salt through chemical bonds via a pre-reaction method. This modified product has both vulcanization promoting function and silane coupling function, thereby achieving faster vulcanization speed and lower hysteresis loss while replacing DPG. It can also reduce the amount of silane coupling agent used, which is beneficial to reducing VOC emissions. Attached Figure Description

[0018] Figure 1 The estimated foaming results for the production formula in Table 3 provided in this embodiment of the invention are as follows: 9.3 min. Figure 2 The estimated bubble rate for the experimental formulation in Table 3 provided in this embodiment of the invention is calculated at 8.8 min. Figure 3 The DMA temperature scan diagrams for the embodiments and comparative products of this invention are shown below. Figure 4 for Figure 3 Magnified view at 50-80℃. Detailed Implementation

[0019] The technical solutions in specific embodiments of the present invention will be described in detail and completely below. Obviously, the described embodiments are only some specific implementations of the overall technical solution of the present invention, and not all implementations. Based on the overall concept of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0020] A tire tread rubber composition includes a rubber component. In some embodiments, the rubber component is selected from at least one of natural rubber, polybutadiene rubber, solution-polymerized styrene-butadiene rubber, and emulsion-polymerized styrene-butadiene rubber.

[0021] A tire tread rubber composition includes silica. In some embodiments, the silica is precipitated silica with a BET specific surface area of ​​100-300 m². 2 / g.

[0022] A tire tread rubber composition comprising a modifying additive.

[0023] In some embodiments, the modified additive is prepared by the following method: Phosphorus pentasulfide reacts with alcohols to produce O,O'-dialkyldithiophosphoric acid; O,O'-dialkyl dithiophosphate was reacted with chlorosilane in the presence of an acid-binding agent to generate a silane-functionalized dithiophosphate intermediate. The modified additive is obtained by reacting a silane-functionalized dithiophosphate intermediate with a metal oxide.

[0024] The reaction mechanism of the above preparation process is as follows: Step 1: Phosphorus pentasulfide (P2S5) reacts with an alcohol (ROH) to produce O,O'-dialkyl dithiophosphoric acid. P2S5+4ROH→2(RO)2P(S)SH+H2S↑ Step 2: Recycle the dithiophosphoric acid obtained in Step 1 with chlorosilane Si(R'). n (OR'') m Cl 4-n-m The reaction proceeds in the presence of an acid-binding agent to generate a silane-functionalized dithiophosphate intermediate: (RO)2P(S)SH+Si(R') n (OR'') m Cl 4-n-m +Base→(RO)2P(S)S-Si(R') n (OR'') m Cl3-n-m +Base•HCl Step 3: React the intermediate obtained in Step 2 with a metal oxide to generate the target product: 2(RO)2P(S)S-Si(R') n (OR'') m Cl 3-n-m +MO→[(RO)2P(S)S-Si(R') n (OR'') m Cl 3-n-m 2M+H2O The metal ion is selected from one of Zn, Mg, K, Al, Fe, and Na, with Zn being preferred.

[0025] In existing technologies, dialkyl dithiophosphate metal salts and silane coupling agents are used in combination through physical blending, without forming chemical bonds between them. In this approach, the promoting activity and coupling efficiency of the dialkyl dithiophosphate metal salt still have room for improvement, and its compatibility with the rubber matrix and its directional anchoring ability on the silica surface are insufficient, limiting further optimization of vulcanization rate and hysteresis loss. The present invention addresses this by introducing silane groups into the molecular structure of the dialkyl dithiophosphate metal salt through a pre-reaction method via chemical bonds. This modified product possesses both vulcanization promoting and silane coupling functions, thereby achieving faster vulcanization rates and lower hysteresis losses while replacing DPG, and reducing the amount of silane coupling agent used, which is beneficial for reducing VOC emissions.

[0026] In some embodiments, the modified additive is a silane-modified dialkyl dithiophosphate metal salt. The silane-modified dialkyl dithiophosphate metal salt is [(RO)₂P(S)-S-]-Si(R'). n (OR'') m Cl 3-n-m Complexes with metal ions; wherein the metal ion is selected from Zn, Mg, K, Al, Fe, and Na; R is selected from C1-C 18 The alkyl, cycloalkyl, or aryl group; R' is selected from C1-C6 alkyl groups; R'' is selected from C1-C6 alkyl groups; n is 0, 1, 2, or 3; m is 0, 1, 2, or 3, and n+m≤3.

[0027] In some embodiments, the chlorosilane is at least one of triethoxychlorosilane, (methoxymethyl)trichlorosilane, or dimethyldichlorosilane. Triethoxychlorosilane is preferred.

[0028] A tire tread rubber composition includes a rubber component, silica, a silane coupling agent, a modifying additive, a vulcanizing agent, and other rubber additives. The modifying additive can partially or completely replace DPG.

[0029] In some embodiments, the amount of rubber component is 100 parts by weight, the amount of silica is 50-120 parts, the amount of silane coupling agent is 5-8% of the amount of silica, the amount of modifying additive is 1-5% (more preferably 1-2%) of the amount of silica, and the amount of vulcanizing agent is 0.5-5 parts.

[0030] Understandably, the amount of silica can be 60 parts, 70 parts, 80 parts, 90 parts, 100 parts, 110 parts, or any value within the range thereof; the amount of silane coupling agent can be 6% or 7% of the amount of silica, or any value within the range thereof; the amount of modifying additive can be 2%, 3%, or 4% of the amount of silica, or any value within the range thereof; and the amount of vulcanizing agent can be 1 part, 2 parts, 3 parts, 4 parts, or any value within the range thereof.

[0031] In some embodiments, the rubber component is selected from at least one of natural rubber, polybutadiene rubber, solution-polymerized styrene-butadiene rubber, and emulsion-polymerized styrene-butadiene rubber; the silica is precipitated silica with a specific surface area of ​​100-300 m². 2 / g; the silane coupling agent is a polysulfide alkoxysilane, selected from at least one of Si69, Si75, KH-580, NXT, and Si818; the vulcanizing agent is selected from sulfur and / or insoluble sulfur; and other rubber additives are selected from at least one of carbon black, processing oil, resin, zinc oxide, stearic acid, antioxidant, accelerator, and scorch inhibitor.

[0032] Another aspect of the present invention provides a method for preparing a tire tread rubber composition according to any of the above technical solutions, comprising: mixing rubber components, silica, silane coupling agent and modifying additives, as well as zinc oxide, stearic acid, carbon black, resin, antioxidant, protective wax and softener in an intensive manner; pressing and mixing the rubber; mixing at a constant temperature; and discharging the rubber into sheets and cooling them to obtain masterbatch. The masterbatch, accelerator, and vulcanizing agent are mixed, then pressed and mixed again after being lifted and pressed, and finally the rubber is discharged, sheeted, and cooled to obtain the final rubber.

[0033] In some embodiments, the rubber component, silica, silane coupling agent, and modifying additives, along with zinc oxide, stearic acid, carbon black, resin, antioxidant, protective wax, and softener, are internally mixed in an internal mixer. The internal mixer rotor speed is 45-60 rpm, and the top bolt pressure is 60 N / cm. 2 The internal mixer is cooled to 40-50℃, and the rubber is pressed and mixed to 135-150℃. It is then kept at this temperature for 120-240 seconds, discharged, and sheeted to obtain the masterbatch. The masterbatch, accelerator, and vulcanizing agent are then added to the internal mixer and mixed for 20 seconds. 40s, internal mixer speed 20 40 rpm; after lifting the plug, press the plug and mix to 90 rpm. 110℃; after debinding and cooling, the final rubber compound is obtained.

[0034] The present invention also provides a tire, the tread of which is made of the tire tread rubber composition of any of the above claims.

[0035] To provide a clearer and more detailed description of the tire tread rubber composition, its preparation method, and the tire provided in the embodiments of the present invention, the following description will be based on specific embodiments.

[0036] Example 1 1. Preparation of modified additives (using triethoxychlorosilane for modification) (1) Under N2 protection, 22.2 g (100 mmol) of P2S5 was added to a 250 mL three-necked flask, and 50 mL of anhydrous ethanol was slowly added dropwise. The mixture was heated to 65 °C and reacted until the solution was clear to obtain O,O'-diethyldithiophosphoric acid.

[0037] (2) Dissolve the product obtained in step (1) in anhydrous benzene, add an equimolar amount of triethoxychlorosilane (ClSi(OEt)3) and an equimolar amount of triethylamine, reflux for 5 hours, filter to remove triethylamine hydrochloride, remove the solvent under reduced pressure, and obtain (EtO)2P(S)-S-Si(OEt)3 intermediate.

[0038] (3) Dissolve the intermediate obtained in step (2) in toluene, add 0.5 times the molar amount of ZnO, heat to 80°C and react for 3 hours, filter to remove excess ZnO, evaporate the solvent under reduced pressure to obtain the target product triethoxychlorosilane modified diethyl dithiophosphate zinc.

[0039] 2. Preparation of rubber compositions Prepare rubber compositions according to the formulations (parts by weight) in Table 1.

[0040] Table 1 Raw Material Formula

[0041] In Table 1, the butadiene rubber grade 9104 is a product of Zhejiang Chuanhua Co., Ltd.; the solution-polymerized styrene-butadiene rubber is composed of 50 parts SSBR1 (styrene content 21%, vinyl content 43%, dry rubber) and 41.25 parts SSBR2 (styrene content 36%, vinyl content 26%, TDAE oil 37.5 parts), a product of Kumho Petrochemical Co., Ltd., South Korea; the precipitated silica is traded as 1165MP, a product of Zhuzhou Xinglong New Materials Co., Ltd.; the silane coupling agent is traded as liquid Si75, a commercially available product; the microcrystalline wax is HG72, a product of Shandong Yanggu Huatai; the heavy naphthenic oil is V700, a product of Ningbo Hansheng Chemical Co., Ltd.; the stearic acid is SA-1845, a product of Hangzhou Zanyu Oil Technology Co., Ltd.; and the anti-slip resin is CSR6383, a product of Jiangsu Qixiang High-tech Materials Co., Ltd.

[0042] The preparation method of the above rubber composition is as follows: First stage of mixing: Butadiene rubber, styrene-butadiene rubber, zinc oxide, stearic acid, silica, carbon black, silane coupling agent, resin, antioxidant, bimodal microcrystalline wax, and heavy naphthenic oil are mixed in an internal mixer to obtain the masterbatch. The rotor speed is 50 rpm, and the pressure of the top bolt is 60 N / cm². 2 The internal mixer cooling water temperature is 60℃, and the glue discharge temperature is 145℃.

[0043] Second-stage mixing: The above-mentioned masterbatch, crosslinking agent, accelerator, and silane-modified dialkyl dithiophosphate zinc are mixed in an internal mixer to obtain the final rubber. The rotor speed is 50 rpm, and the top bolt pressure is 60 N / cm. 2 The internal mixer cooling water temperature is 40℃, and the glue discharge temperature is 100℃.

[0044] The final rubber is vulcanized to obtain vulcanized rubber compound.

[0045] Example 2 The difference from Example 1 is that DPG is used to replace silane-modified dialkyl dithiophosphate zinc in an equal amount of 1.2 parts (replacing half of the DPG), while other components and processes remain unchanged.

[0046] Example 3 The difference from Example 1 is that the amount of silane-modified dialkyl dithiophosphate zinc used is 2.4 parts, the amount of silane coupling agent is 6 parts, and the other components and processes remain unchanged.

[0047] Comparative Example 1 The difference from Example 1 is that DPG is used to replace silane-modified dialkyl dithiophosphate zinc in an equal amount of 2.4 parts, while other components and process conditions remain unchanged.

[0048] Comparative Example 2 The difference from Example 1 is that an equal amount of unmodified zinc dialkyl dithiophosphate was used to replace the silane-modified product prepared in Example 1, while other components and process conditions remained unchanged.

[0049] Comparative Example 3 The difference from Example 1 is that the silane-modified product prepared in Example 1 is replaced with an equal amount of unmodified zinc dialkyl dithiophosphate, and an additional 1.5 g of triethoxysilane is added (to maintain the same molar number of silane functional groups), while other components and process conditions remain unchanged.

[0050] Performance testing The products obtained from the above embodiments and comparative examples were subjected to performance tests, and the test results are shown in Table 2.

[0051] Table 2 Performance Test Results

[0052] In Table 2, the vulcanization characteristics were tested according to the requirements of the national standard GB / T 16584-1996, with a test temperature of 161℃ and a test time of 40min; the dynamic mechanical properties were tested using temperature scanning, with a temperature range of -40℃ to 80℃, a heating rate of 2℃ / min, and a strain of 7%±0.25%; the DIN test was conducted according to GB / T 9867-2008.

[0053] Comparative Example 1 is all DPG, Example 1 is a complete replacement, Example 2 is a 1:1 replacement, Example 3 is a complete replacement with a reduction in the amount of silane coupling agent, Comparative Example 2 is unmodified zinc dialkyl dithiophosphate completely replacing DPG, and Comparative Example 3 is unmodified zinc dialkyl dithiophosphate physically mixed with silane modifier to completely replace DPG (compared with Example 1).

[0054] As can be seen from Table 2, compared with Comparative Example 1, Example 1 showed faster vulcanization speed, comparable hardness, slightly better wet slip resistance, hysteresis decreased by 22%, and improved wear resistance; Example 2 also showed similar effects, but the effect was in between; Example 3 still showed good hysteresis even after reducing the amount of silane, indicating that the filler was well dispersed and the modified product played a role in promoting the silane coupling agent.

[0055] Compared with Comparative Example 2, the silane-modified product of Example 1 has a faster vulcanization speed and lower hysteresis. This may be because the silane groups in the silane-modified dialkyl dithiophosphate zinc can form strong chemical bonds with the silanol groups on the surface of silica. At the same time, the zinc dithiophosphate partially participates in the construction of the vulcanization network, which enhances the interaction between filler and rubber and weakens the interaction between fillers. This is manifested in a reduced Payne effect and a significant reduction in the tanδ value at 70°C, thereby effectively reducing the rolling resistance of the tire and improving its wear resistance.

[0056] Compared with Comparative Example 3, Example 1 is a chemical pre-reaction, which may contain bridging structures such as Si-OP, Si-SP or Si-S-Zn. It has better synergistic effect than simple physical mixing, with faster vulcanization speed, lower hysteresis loss and slightly better wear resistance.

[0057] During the tire vulcanization process, the shortest time during which the tire rubber compound does not produce bubbles is defined as the "foaming point." Using this as a benchmark and setting a safety factor, the "positive vulcanization time" that ensures tire quality can be obtained. The test is conducted on a tire with the weakest point of vulcanization on the tread, specifically a specification 215 / 55R17 98V. The procedure involves directly dissecting the tire after vulcanizing at the weakest point of the tread at the shortest vulcanization time to confirm whether bubbles have been generated. This is generally called the bubble estimation test in industry.

[0058] Using Example 1 and Comparative Example 1, a bubble estimation test was conducted on tires with weak vulcanization points on the tread. The results are shown in Table 3.

[0059] Table 3. Bubble estimation results for 215 / 55R17 98V tires

[0060] The production formula in Table 3 refers to Comparative Example 1, and the experimental formula refers to Example 1.

[0061] Combined with Table 3 and Figure 1 , 2 It was found that the experimental method was 1.5 minutes faster than the production formula, significantly reducing vulcanization costs and enhancing competitiveness.

[0062] Combination Figure 3 , 4 The DMA temperature scan graphs of the examples and comparative examples show that Example 1 has the least hysteresis loss and higher wear resistance, and can completely replace DPG (Comparative Example 1). Example 3 shows that it can reduce the amount of silane used and reduce VOC emissions. After modification, Example 1 is better than the unmodified (Comparative Example 2) and the simple physical mixing (Comparative Example 3).

[0063] In summary, the above-mentioned technical solution of the present invention has the following characteristics: 1. The vulcanization rate is significantly accelerated. This invention uses silane-modified dialkyl dithiophosphate zinc to replace DPG. Because the silane group is chemically bonded to the zinc dithiophosphate molecule, this modified product can participate more effectively in the silanization and sulfidation reactions on the surface of silica during the sulfidation process, thereby significantly shortening the positive sulfidation time (t). 90 ).

[0064] 2. The lag loss is significantly reduced. Because the silane groups in silane-modified dialkyl dithiophosphate zinc can form strong chemical bonds with the silanol groups on the surface of silica, and the zinc dithiophosphate partially participates in the construction of the vulcanization network, the interaction between filler and rubber is enhanced and the interaction between fillers is weakened. This is manifested as a reduction in the Payne effect and a significant reduction in the tanδ value at 70℃, thereby effectively reducing the rolling resistance of the tire.

[0065] 3. Completely replaces DPG, achieving environmental protection. The composition of this invention does not contain DPG, thus eliminating the environmental hazard of aniline substances released during the processing and use of guanidine promoters.

[0066] 4. Synergistic effect, reducing the amount of silane coupling agent used In this invention, the silane-modified dialkyl dithiophosphate zinc itself contains silane functional groups, which can partially replace the added silane coupling agent, reducing the amount of expensive silane coupling agent while ensuring or improving performance.

[0067] 5. When the precipitated silica tire tread is a weak point in vulcanization, the vulcanization time can be shortened, the vulcanization cost can be significantly reduced, and competitiveness can be enhanced.

Claims

1. A tire tread rubber composition, characterized in that, It includes a rubber component, silica, and a modifying additive, wherein the modifying additive is prepared by the following method: Phosphorus pentasulfide reacts with alcohols to produce O,O'-dialkyldithiophosphoric acid; O,O'-dialkyl dithiophosphate was reacted with chlorosilane in the presence of an acid-binding agent to generate a silane-functionalized dithiophosphate intermediate. The modified additive is obtained by reacting a silane-functionalized dithiophosphate intermediate with a metal oxide.

2. The tire tread rubber composition according to claim 1, characterized in that, The chlorosilane is at least one of triethoxychlorosilane, (methoxymethyl)trichlorosilane, or dimethyldichlorosilane.

3. The tire tread rubber composition according to claim 1, characterized in that, It includes the rubber component, the silica, the silane coupling agent, the modifying additive, the vulcanizing agent, and other rubber additives.

4. The tire tread rubber composition according to claim 3, characterized in that, The amount of the rubber component is 100 parts by weight, the amount of the silica is 50-120 parts, the amount of the silane coupling agent is 5-8% of the amount of silica, the amount of the modifying additive is 1-5% of the amount of silica, and the amount of the vulcanizing agent is 0.5-5 parts.

5. The tire tread rubber composition according to claim 3, characterized in that, The rubber component is selected from at least one of natural rubber, polybutadiene rubber, solution-polymerized styrene-butadiene rubber, and emulsion-polymerized styrene-butadiene rubber; the silica is precipitated silica; the silane coupling agent is a polysulfide alkoxysilane; the vulcanizing agent is selected from sulfur and / or insoluble sulfur; and the other rubber additives are selected from at least one of carbon black, processing oil, resin, zinc oxide, stearic acid, antioxidant, accelerator, and scorch inhibitor.

6. The tire tread rubber composition according to claim 5, characterized in that, The BET specific surface area of ​​the silica is 100-300 m². 2 / g.

7. The tire tread rubber composition according to claim 5, characterized in that, The silane coupling agent is selected from at least one of Si69, Si75, KH-580, NXT, and Si818.

8. The method for preparing the tire tread rubber composition according to any one of claims 1-7, characterized in that, include: The rubber components, silica, silane coupling agent and modifying additives, as well as zinc oxide, stearic acid, carbon black, resin, antioxidant, protective wax and softener are mixed in an intensive manner, then pressed and mixed at a constant temperature, and the rubber is discharged, sheeted and cooled to obtain the masterbatch. The masterbatch, accelerator and vulcanizing agent are mixed, and after being lifted and pressed, they are mixed again, and the rubber is discharged, sheeted and cooled to obtain the final rubber.

9. The preparation method according to claim 8, characterized in that, The rubber components, silica, silane coupling agent, modifying additives, zinc oxide, stearic acid, carbon black, resin, antioxidant, protective wax, and softener are mixed in an internal mixer at a rotor speed of 45-60 rpm and a top bolt pressure of 60 N / cm. 2 The internal mixer is cooled to 40-50℃, and the rubber is pressed and mixed to 135-150℃. It is then kept at this temperature for 120-240 seconds, discharged, and sheeted to obtain the masterbatch. The masterbatch, accelerator, and vulcanizing agent are then added to the internal mixer and mixed for 20 seconds. 40s, internal mixer speed 20 40 rpm; after lifting the plug, press the plug and mix to 90 rpm. 110℃; after debinding and cooling, the final rubber compound is obtained.

10. A tire, characterized in that, The tread is made of the tire tread rubber composition according to any one of claims 1-7.

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