Preparation method of high-wear-resistance low-oil-consumption tire special precipitated silicon dioxide

Abstract

The application discloses a preparation method of high-wear-resistance and low-oil-consumption special precipitated silicon dioxide for tires, and comprises the following steps: S1, raw material preparation, selecting solid sodium silicate with a modulus of 3.0-3.5, preparing water glass solution and sulfuric acid as an acidifying agent for standby; S2, feeding, temperature control and stirring, adding bottom water and water glass into a reaction kettle, heating and controlling temperature and stirring speed; S3, acid-base co-adding reaction, synchronously adding acid and lye, maintaining pH range and temperature, and stopping the reaction until the reaction volume reaches 50 %; S4, spraying an auxiliary agent for continuous reaction; S6, pressure filtration, washing and beating; and S7, spray drying a finished product. In the stage of synthesizing silicon dioxide, sucrose fatty acid ester is added as a reaction auxiliary agent, so that the reaction auxiliary agent acts on the surface of white carbon black particles in the system, the agglomeration of the white carbon black is blocked, the target product has higher specific surface area, better dispersity and higher oil absorption value, and has excellent wear resistance and lower rolling resistance.

Description

Technical Field

[0001] This invention relates to the field of silica preparation technology, and in particular to a method for preparing precipitated silica for tires with high wear resistance and low oil consumption. Background Technology

[0002] Fuel-efficient and wear-resistant tires employ a novel design that reduces rolling resistance, thereby lowering fuel consumption and emissions. They also offer improved tread wear resistance, significantly extending tire lifespan. Silica, as an environmentally friendly and highly reactive reinforcing filler in tires, is used in energy-efficient and wear-resistant treads, providing excellent wear resistance while maintaining low rolling resistance. However, precipitated silica prepared in existing technologies tends to agglomerate in the rubber matrix, leading to a decrease in specific surface area and oil absorption, thus affecting the reinforcing effect. Therefore, this paper proposes a method for preparing precipitated silica specifically for high-wear-resistant and low-fuel-consumption tires to address these issues. Summary of the Invention

[0003] The purpose of this invention is to provide a method for preparing precipitated silica for high wear resistance and low oil consumption tires, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing precipitated silica for high wear-resistant and low fuel consumption tires, comprising:

[0005] S1, Raw material preparation: Select solid sodium silicate with a modulus of 3.0-3.5, and prepare water glass solution and sulfuric acid as acidifying agents for later use; S2, Adding materials, controlling temperature and stirring: Add bottom water and water glass to the reactor, heat and control the temperature and stirring speed; S3, acid-base co-addition reaction, acid and alkali solutions are added simultaneously, maintaining the pH range and temperature, until the reaction volume reaches 50%; S4, the spraying aid continues to react. First, the spraying aid is mixed well, then acid and alkali are added while controlling the pH range, until the reaction volume reaches 80%. S5, acid adjustment and aging: add acid to adjust the pH to slightly acidic, then stop and let it stand for aging; S6, filtration, washing and pulping: the reaction slurry is filtered and washed with water, and the filter cake is adjusted to make a thick slurry; S7, spray-dried finished product, the concentrated slurry is processed to obtain granular silica, and the moisture content is controlled.

[0006] Preferably, the raw material preparation in step S1 includes the following steps: S101, Preparation of raw material solution: Select solid sodium silicate with a specified modulus and prepare a water glass solution with a concentration of 15wt%-25wt%. S102, Preparation of acidifying agent: Prepare a sulfuric acid solution with a concentration of 15wt%-20wt% as an acidifying agent for the precipitation reaction.

[0007] Preferably, the feeding, temperature control, and stirring in step S2 includes the following steps: S201, Add bottom water: Add 1 / 6 of the volume of industrial tap water into the reactor as bottom water for the reaction; S202, preliminary mixing, adding part of the water glass solution prepared in S1 to the bottom water; S203, temperature control, the temperature of the reaction system is controlled at 50℃-55℃ by steam heating; S204, stirring setting: Set the stirring speed to 90r / min-100r / min.

[0008] Preferably, the acid-base co-addition reaction in S3 includes the following steps: S301, synchronous feeding: while maintaining the temperature and stirring speed of S2, sulfuric acid solution and the remaining sodium silicate solution are simultaneously and concurrently added into the reactor. S302, reaction control, stabilizes the pH of the reaction system at 9.0-10.0 by controlling the feeding rate; S303, endpoint determination: continue feeding and reaction until the total volume of the reaction system reaches 50% of the reactor volume; S304, time control: the total reaction time of the reaction stage is controlled within 40 min to 60 min.

[0009] Preferably, the subsequent reaction of the spraying aid in S4 includes the following steps: S401, add dispersant, after the reaction in S3 is completed, keep the temperature and stirring speed constant, add sucrose fatty acid ester solution by spraying, and stir for 20 minutes; S402, continue the precipitation reaction, maintain the reaction conditions, and continue to add sulfuric acid solution and sodium silicate solution simultaneously; S403, flow control, during this feeding process, the flow rate of sodium silicate solution is controlled to be greater than the flow rate of sulfuric acid solution; S404, maintain the conditions, keep the pH of the reaction system between 9.0 and 10.0; S405, volume endpoint, continue feeding the reaction until the total volume of the reaction system reaches 80% of the reactor volume; S406, duration control, the total reaction time of the growth stage is set to 60min-80min.

[0010] Preferably, the acid adjustment and aging process in step S5 includes the following steps: S501: After the reaction in S4 is completed, keep the reaction conditions unchanged and continue to add sulfuric acid solution to adjust the pH of the reaction system to 5.5-6.5. S502, stop adding acid, and age the reaction system for 20-30 minutes while maintaining stirring. The reaction is then complete.

[0011] Preferably, the filter press washing and pulping in step S6 includes the following steps: S601, solid-liquid separation, the reaction slurry obtained in S5 is filtered by pressure to achieve solid-liquid separation and obtain precipitated silica filter cake; S602, online washing monitoring, uses industrial tap water to wash filter cake, and judges the degree of impurity removal by monitoring the conductivity of the washing water online; S603, Concentrate preparation, which involves turning the washed filter cake into a concentrated paste.

[0012] Preferably, the washing of the filter cake in step S602 includes the following situations: The first method involves continuing to wash the filter cake when the sodium sulfate content is greater than or equal to 2%. The second method involves stopping the washing of the filter cake when the sodium sulfate content is less than 2%.

[0013] Preferably, the preparation of concentrated slurry in step S603 includes the following steps: S6031, solids content control, controlling the solids content of the filter cake obtained after washing to 20%-25%; S6032, Pulping: The filter cake with the required solid content is fed into a pulping machine and stirred to make a thick pulp.

[0014] Preferably, the spray-dried finished product in step S7 includes the following steps: S701, Feed Drying, conveys the concentrated slurry prepared by S6 to the feed system of the spray dryer; S702, heat source supply, hot air is used as the heat source for spray drying; S703, finished product control, after drying, yields granular products with a moisture content of 5%-7%.

[0015] The technical effects and advantages of this invention are as follows: In this invention, sucrose fatty acid esters are added as reaction aids during the synthesis of silica. These aids act on the surface of silica particles in the system, preventing silica agglomeration. This results in a target product with a high specific surface area, good dispersibility, high oil absorption value, excellent wear resistance, and low rolling resistance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides, for example Figure 1 The method for preparing precipitated silica for high wear resistance and low fuel consumption tires, as shown, includes: S1, Raw material preparation: Select solid sodium silicate with a modulus of 3.0-3.5, and prepare water glass solution and sulfuric acid as acidifying agents for later use; The raw material preparation in S1 includes the following steps: S101, Preparation of raw material solution: Select solid sodium silicate with a specified modulus and prepare a water glass solution with a concentration of 15wt%-25wt%. S102, Preparation of acidifying agent: Prepare a sulfuric acid solution with a concentration of 15wt%-20wt% as an acidifying agent for the precipitation reaction.

[0019] It should be noted that the raw material preparation aims to provide the system with silicon and acid sources that meet specific specifications. First, the raw material solution is prepared, with the key raw material being solid sodium silicate, whose modulus is strictly limited to between 3.0 and 3.5. This solid sodium silicate is dissolved in deionized water or industrial tap water to prepare a water glass solution with a concentration of 15wt% to 25wt%. The preparation process must be carried out thoroughly with stirring to ensure the formation of a homogeneous and clear sodium silicate aqueous solution for later use. Second, the acidifying agent is prepared, and a sulfuric acid solution, which serves as a precipitant and pH adjuster, is prepared simultaneously. Concentrated sulfuric acid is slowly added to water, diluted, and brought to volume, ultimately preparing a sulfuric acid solution with a concentration of 15wt% to 20wt%. The selection of this concentration range is the result of comprehensive consideration of reaction rate control, feeding accuracy, and operational safety. A sulfuric acid solution with an appropriate concentration is beneficial for achieving more stable and precise pH control during subsequent co-current feeding, thereby affecting the uniformity of nucleation and growth of primary silica particles.

[0020] S2, Adding materials, controlling temperature and stirring: Add bottom water and water glass to the reactor, heat and control the temperature and stirring speed; The feeding, temperature control, and stirring process in S2 includes the following steps: S201, Add bottom water: Add 1 / 6 of the volume of industrial tap water into the reactor as bottom water for the reaction; S202, preliminary mixing, adding part of the water glass solution prepared in S1 to the bottom water; S203, temperature control, the temperature of the reaction system is controlled at 50℃-55℃ by steam heating; S204, stirring setting: Set the stirring speed to 90r / min-100r / min.

[0021] It should be noted that, firstly, industrial water, filling approximately 1 / 6 of the total volume of the clean reactor, is used as the base water for the reaction. Insufficient water will result in excessively high initial material concentrations and uneven mixing in certain areas, while excessive water will dilute the reactants, reducing the initial reaction rate and subsequent production efficiency. Secondly, the pre-prepared water glass solution from S1 is added to the base water. Then, steam is introduced through the reactor jacket for heating, precisely controlling the temperature of the mixture inside the reactor within the range of 50°C to 55°C. This temperature range is the optimized reaction start-up temperature; too low a temperature will result in a slow reaction rate and insufficient nucleation motive force; too high a temperature may lead to an excessively fast reaction, particle agglomeration, or increased energy consumption. Finally, the stirrer is started and its speed is set within the range of 90 r / min to 100 r / min. This stirring speed is designed to provide sufficient but not excessive shear force and mixing intensity to the reaction system, ensuring rapid and uniform diffusion of the reactants after addition, avoiding excessively high local pH or concentration, while simultaneously promoting heat and mass transfer, creating stable and controllable hydrodynamic conditions for the entire precipitation process. At this point, the reaction system is ready under the preset temperature and stirring conditions and can proceed to the next stage of precipitation reaction.

[0022] S3, acid-base co-addition reaction, acid and alkali solutions are added simultaneously, maintaining the pH range and temperature, until the reaction volume reaches 50%; The acid-base co-addition reaction in S3 includes the following steps: S301, synchronous feeding: while maintaining the temperature and stirring speed of S2, sulfuric acid solution and the remaining sodium silicate solution are simultaneously and concurrently added into the reactor. S302, reaction control, stabilizes the pH of the reaction system at 9.0-10.0 by controlling the feeding rate; S303, endpoint determination: continue feeding and reaction until the total volume of the reaction system reaches 50% of the reactor volume; S304, time control: the total reaction time of the reaction stage is controlled within 40 min to 60 min.

[0023] First, while maintaining the reaction temperature (50℃-55℃) and stirring speed (90-100 r / min) set in stage S2, the sulfuric acid solution prepared in stage S1 and all remaining sodium silicate solution are simultaneously and continuously added to the reactor in a parallel flow manner using a metering pump. This parallel flow addition method effectively avoids localized over-addition of acid or alkali. Second, by monitoring and dynamically adjusting the addition rates of the acid and alkali solutions in real time, the pH value of the entire reaction system is precisely and stably maintained within the range of 9.0 to 10.0. Then, the above simultaneous addition is continued. The feeding and reaction are monitored using a liquid level gauge or volume metering device. Feeding is stopped when the total volume of the reaction mixture reaches 50% of the effective volume of the reactor. This volume endpoint marks the completion of the nucleation stage. The entire nucleation reaction time, from the start of feeding to reaching the 50% volume endpoint, is controlled within 40-60 minutes. This time range, in conjunction with the feeding rate, aims to provide sufficient and controllable reaction time for the formation of primary particles, avoiding either excessively fast reaction leading to a wider particle size distribution or excessively slow reaction affecting production efficiency. At this point, a suspension of primary silica particles, serving as the product's framework, is generated.

[0024] S4, the spraying aid continues to react. First, the spraying aid is mixed well, then acid and alkali are added while controlling the pH range, until the reaction volume reaches 80%. The subsequent reaction of the spraying aid in S4 includes the following steps: S401, add dispersant, after the reaction in S3 is completed, keep the temperature and stirring speed constant, add sucrose fatty acid ester solution by spraying, and stir for 20 minutes; S402, continue the precipitation reaction, maintain the reaction conditions, and continue to add sulfuric acid solution and sodium silicate solution simultaneously; S403, flow control, during this feeding process, the flow rate of sodium silicate solution is controlled to be greater than the flow rate of sulfuric acid solution; S404, maintain the conditions, keep the pH of the reaction system between 9.0 and 10.0; S405, volume endpoint, continue feeding the reaction until the total volume of the reaction system reaches 80% of the reactor volume; S406, duration control, the total reaction time of the growth stage is set to 60min-80min.

[0025] First, after the S3 reaction, a pre-prepared sucrose fatty acid ester solution was uniformly added to the reaction system via spraying, and stirring was continued for 20 minutes. This step aimed to ensure the surfactant molecules were fully adsorbed onto the surface of the primary particles, preventing hard agglomeration during subsequent growth through steric hindrance or electrostatic repulsion, thereby improving the dispersibility and specific surface area of ​​the final product. Subsequently, after the additives were uniformly dispersed, the reaction conditions were maintained, and sulfuric acid and sodium silicate solutions were simultaneously added to the system in a parallel flow, allowing silica to continue depositing and growing on the existing particle surfaces. During this process, the metering pump was adjusted to ensure the sodium silicate feed rate was consistently greater than the sulfuric acid feed rate. This flow differential strategy ensured that the reaction environment remained predominantly alkaline, providing a stable chemical environment for particle surface growth. Simultaneously, the pH of the reaction system was maintained stably within the range of 9.0-10.0 through real-time monitoring and adjustment, consistent with the S3 stage, ensuring the continuity of particle growth conditions. The feeding and reaction continue until the total volume of the reaction mixture reaches 80% of the effective volume of the reactor. This endpoint is set to control the solid content and reaction progress, leaving room for subsequent acidification endpoint adjustment. Finally, the entire process is constrained by the time set in the duration control: the total reaction time from the resumption of feeding to reaching the 80% volume endpoint is strictly controlled between 60 and 80 minutes. This time window, in conjunction with the feeding rate, aims to provide sufficient and controllable time for the uniform and dense growth of silica particles, thereby ultimately optimizing the pore structure and physical properties of the product.

[0026] S5, acid adjustment and aging: add acid to adjust the pH to slightly acidic, then stop and let it stand for aging; The acidification and aging process in S5 includes the following steps: S501: After the reaction in S4 is completed, keep the reaction conditions unchanged and continue to add sulfuric acid solution to adjust the pH of the reaction system to 5.5-6.5. S502, stop adding acid, and age the reaction system for 20-30 minutes while maintaining stirring. The reaction is then complete.

[0027] It should be noted that after the S4 reaction is completed, while maintaining the original system temperature (50℃-55℃) and stirring speed (90r / min-100r / min), the sulfuric acid solution prepared in S1 should be added slowly and separately to the reactor. The purpose of this operation is to perform endpoint acidification, that is, to gradually and smoothly adjust the pH value of the entire reaction system from a weakly alkaline range (9.0-10.0) to a weakly acidic range (5.5-6.5) by precisely controlling the amount of acid added. Once the pH reaches the target range, the addition of acid should be stopped immediately. Subsequently, while maintaining stirring, the reaction system should be allowed to stand and age in this weakly acidic environment for 20-30 minutes to finally obtain a product with a robust structure and stable performance.

[0028] S6, filtration, washing and pulping: the reaction slurry is filtered and washed with water, and the filter cake is adjusted to make a thick slurry; The S6 medium-pressure filter press washing and pulping process includes the following steps: S601, solid-liquid separation, the reaction slurry obtained in S5 is filtered by pressure to achieve solid-liquid separation and obtain precipitated silica filter cake; S602, online washing monitoring, uses industrial tap water to wash filter cake, and judges the degree of impurity removal by monitoring the conductivity of the washing water online; S603, Concentrate preparation, which involves turning the washed filter cake into a concentrated paste.

[0029] Specifically, the washing of the filter cake in S602 includes the following situations: The first method involves continuing to wash the filter cake when the sodium sulfate content is greater than or equal to 2%. The second method involves stopping the washing of the filter cake when the sodium sulfate content is less than 2%.

[0030] Specifically, the preparation of concentrated pulp in S603 includes the following steps: S6031, solids content control, controlling the solids content of the filter cake obtained after washing to 20%-25%; S6032, Pulping: The filter cake with the required solid content is fed into a pulping machine and stirred to make a thick pulp.

[0031] It should be noted that after the S5 aging process, the reaction slurry is transported to a filter press, where liquid-solid separation is achieved under pressure, resulting in a silica filter cake with a high water content, thus removing most of the liquid phase. Subsequently, the filter cake in the filter press is washed multiple times and thoroughly with industrial water. This process is not a simple rinse; rather, the degree of impurity removal is scientifically determined by real-time online monitoring of the conductivity of the washing effluent. The control logic is as follows: if the monitoring indicates that the residual sodium sulfate content in the filter cake is still greater than or equal to 2%, the washing operation continues; only when the monitoring confirms that the sodium sulfate content is below the 2% quality standard is the washing deemed satisfactory and the process terminated. This precise control based on conductivity feedback replaces traditional experience-based operations, ensuring the uniformity and stability of product purity. After washing meets the standards, the process moves to the thickening stage, which is further divided into two continuous operations: First, the moisture content of the washed filter cake is adjusted by squeezing or adding an appropriate amount of process water to precisely control its solids content within the target range of 20% to 25%. This concentration is an optimized balance point. Too low a concentration will increase the energy consumption of subsequent drying, while too high a concentration will result in excessive viscosity and poor fluidity of the slurry, which is not conducive to transportation and atomization. Next, the slurry is prepared by feeding the filter cake with the solids content that meets the standards into a pulper. Under the strong stirring action of mechanical shearing, the cake is redispersed and homogenized to produce a thick slurry with good fluidity and uniform solid phase distribution, providing qualified feed for subsequent efficient and uniform spray drying.

[0032] S7, spray-dried finished product, the concentrated slurry is processed to obtain granular silica, and the moisture content is controlled; The spray-dried product in S7 includes the following steps: S701, Feed Drying, conveys the concentrated slurry prepared by S6 to the feed system of the spray dryer; S702, heat source supply, hot air is used as the heat source for spray drying; S703, finished product control, after drying, yields granular products with a moisture content of 5%-7%.

[0033] It should be noted that the core forming process for efficiently converting the liquid slurry obtained in step S6 into the final solid product is as follows: First, the homogeneous silica slurry with a solid content of 20%-25% prepared in step S6 is stably pumped to the atomizer at the top of the spray drying tower via a high-pressure pump. The slurry is atomized into extremely fine droplets. Subsequently, high-temperature hot air generated by the combustion of clean natural gas is used as the drying medium. The hot air comes into full contact with the atomized droplets in the drying tower in a parallel, counter-current, or mixed flow manner. During this process, the surface moisture of the droplets evaporates rapidly, forming preliminary solid particles. Finally, by precisely controlling parameters such as the feed rate, hot air temperature and flow rate, and negative pressure inside the tower, the residence time and drying intensity of the particles in the tower are controlled to ensure that the silica product obtained after evaporation is a free-flowing microsphere particle, and its final moisture content is strictly controlled within the target range of 5% to 7%.

[0034] Furthermore, this invention incorporates sucrose fatty acid esters as a reaction aid during the silica synthesis stage. This allows the reaction aid to act on the surface of the silica particles in the system, preventing silica agglomeration. As a result, the target product achieves a high specific surface area, good dispersibility, high oil absorption value, excellent wear resistance, and low rolling resistance. Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing precipitated silica for high wear-resistant and low fuel consumption tires, characterized in that, include: S1, Raw material preparation: Select solid sodium silicate with a modulus of 3.0-3.5, and prepare water glass solution and sulfuric acid as acidifying agents for later use; S2, Adding materials, controlling temperature and stirring: Add bottom water and water glass to the reactor, heat and control the temperature and stirring speed; S3, acid-base co-addition reaction, acid and alkali solutions are added simultaneously, maintaining the pH range and temperature, until the reaction volume reaches 50%; S4, the spraying aid continues to react. First, the spraying aid is mixed well, then acid and alkali are added while controlling the pH range, until the reaction volume reaches 80%. S5, acid adjustment and aging: add acid to adjust the pH to slightly acidic, then stop and let it stand for aging; S6, filtration, washing and pulping: the reaction slurry is filtered and washed with water, and the filter cake is adjusted to make a thick slurry; S7, spray-dried finished product, the concentrated slurry is processed to obtain granular silica, and the moisture content is controlled.

2. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 1, characterized in that, The raw material preparation in S1 includes the following steps: S101, Preparation of raw material solution: Select solid sodium silicate with a specified modulus and prepare a water glass solution with a concentration of 15wt%-25wt%. S102, Preparation of acidifying agent: Prepare a sulfuric acid solution with a concentration of 15wt%-20wt% as an acidifying agent for the precipitation reaction.

3. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 1, characterized in that, The feeding, temperature control, and stirring process in step S2 includes the following steps: S201, Add bottom water: Add 1 / 6 of the volume of industrial tap water into the reactor as bottom water for the reaction; S202, preliminary mixing, adding part of the water glass solution prepared in S1 to the bottom water; S203, temperature control, the temperature of the reaction system is controlled at 50℃-55℃ by steam heating; S204, stirring setting: Set the stirring speed to 90r / min-100r / min.

4. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 1, characterized in that, The acid-base co-addition reaction in S3 includes the following steps: S301, synchronous feeding: while maintaining the temperature and stirring speed of S2, sulfuric acid solution and the remaining sodium silicate solution are simultaneously and concurrently added into the reactor. S302, reaction control, stabilizes the pH of the reaction system at 9.0-10.0 by controlling the feeding rate; S303, endpoint determination: continue feeding and reaction until the total volume of the reaction system reaches 50% of the reactor volume; S304, time control: the total reaction time of the reaction stage is controlled within 40 min to 60 min.

5. The method for preparing precipitated silica for high wear-resistant and low oil consumption tires according to claim 1, characterized in that, The subsequent reaction of the spraying aid in S4 includes the following steps: S401, add dispersant, after the reaction in S3 is completed, keep the temperature and stirring speed constant, add sucrose fatty acid ester solution by spraying, and stir for 20 minutes; S402, continue the precipitation reaction, maintain the reaction conditions, and continue to add sulfuric acid solution and sodium silicate solution simultaneously; S403, flow control, during this feeding process, the flow rate of sodium silicate solution is controlled to be greater than the flow rate of sulfuric acid solution; S404, maintain the conditions, keep the pH of the reaction system between 9.0 and 10.0; S405, volume endpoint, continue feeding the reaction until the total volume of the reaction system reaches 80% of the reactor volume; S406, duration control, the total reaction time of the growth stage is set to 60min-80min.

6. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 1, characterized in that, The acid-adjusting and aging process in S5 includes the following steps: S501: After the reaction in S4 is completed, keep the reaction conditions unchanged and continue to add sulfuric acid solution to adjust the pH of the reaction system to 5.5-6.

5. S502, stop adding acid, and age the reaction system for 20-30 minutes while maintaining stirring. The reaction is then complete.

7. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 1, characterized in that, The filter press washing and pulping process in S6 includes the following steps: S601, solid-liquid separation, the reaction slurry obtained in S5 is filtered by pressure to achieve solid-liquid separation and obtain precipitated silica filter cake; S602, online washing monitoring, uses industrial tap water to wash filter cake, and judges the degree of impurity removal by monitoring the conductivity of the washing water online; S603, Concentrate preparation, which involves turning the washed filter cake into a concentrated paste.

8. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 7, characterized in that, The filter cake washing process in S602 includes the following situations: The first method involves continuing to wash the filter cake when the sodium sulfate content is greater than or equal to 2%. The second method involves stopping the washing of the filter cake when the sodium sulfate content is less than 2%.

9. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 7, characterized in that, The preparation of concentrated pulp in S603 includes the following steps: S6031, solids content control, controlling the solids content of the filter cake obtained after washing to 20%-25%; S6032, Pulping: The filter cake with the required solid content is fed into a pulping machine and stirred to make a thick pulp.

10. The method for preparing precipitated silica for high wear-resistant and low fuel consumption tires according to claim 1, characterized in that, The spray-dried finished product in S7 includes the following steps: S701, Feed Drying, conveys the concentrated slurry prepared by S6 to the feed system of the spray dryer; S702, heat source supply, hot air is used as the heat source for spray drying; S703, finished product control, after drying, yields granular products with a moisture content of 5%-7%.

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