High-strength anti-aging styrene-butadiene rubber and preparation method thereof

Abstract

The invention discloses high-strength anti-aging styrene-butadiene rubber and a preparation method thereof, and belongs to the field of synthetic rubber modification. Porous reticular ZnO aggregated by 6.5 nm ZnO nanoparticles is synthesized by a hydrothermal method by using a composite surfactant of PVP K30 and polyvinyl alcohol 600 in a ratio of 1: 1, and the ZnO is not dried after synthesis so as to avoid aggregation; the preparation method comprises the following steps: carrying out surface modification with a silane coupling agent KH560, carrying out segmented temperature control mixing with styrene-butadiene rubber, carbon black N330 and other assistants, and carrying out pre-crosslinking and gradient heating vulcanization to obtain a finished product. A porous net structure allows rubber slurry to fully permeate, the contact area of the filler and a matrix is increased, and efficient reinforcement is realized by low mixing amount; znO nano-particles can convert ultraviolet light into visible light, and the aging resistance is enhanced by matching with the scattering effect of a porous structure; the coupling agent modifies and optimizes the interfacial compatibility, the problem that agglomeration and performance of a traditional filler are difficult to consider is solved, and the finished product has high strength and excellent aging resistance and meets the requirements of tires, sealing elements and other scenes.

Description

Technical Field

[0001] This invention belongs to the field of synthetic rubber modification technology, specifically relating to a high-strength, aging-resistant styrene-butadiene rubber and its preparation method. Background Technology

[0002] Styrene-butadiene rubber (SBR) is one of the most widely used synthetic rubbers. Due to its good processability, wear resistance, and cost-effectiveness, it is widely used in tires, seals, outdoor cable sheaths, and building waterproofing membranes. However, the SBR molecular chain contains a large number of unsaturated double bonds, making it highly susceptible to oxidative degradation and cross-linking aging induced by environmental factors such as ultraviolet radiation and heat. This leads to loss of elasticity, increased hardness, and a significantly shortened service life in the finished product. Furthermore, the intermolecular forces in pure SBR are weak, resulting in insufficient mechanical strength, necessitating the addition of inorganic reinforcing particles to improve its performance.

[0003] In the industry, inorganic particles such as silica, carbon black, and talc are commonly used as modifiers for styrene-butadiene rubber (SBR). Silica and carbon black can enhance the mechanical strength of rubber through filling and reinforcement, while layered inorganic particles like talc can improve aging resistance through physical barrier properties. However, these inorganic particles all have significant drawbacks: silica has a high hydroxyl content, making it prone to agglomeration and exhibiting poor compatibility with the rubber matrix, requiring coupling agents to achieve uniform dispersion; carbon black offers excellent reinforcement but has weak UV blocking capabilities, failing to simultaneously improve the rubber's UV aging resistance; talc, while blocking some UV rays, has low reinforcement efficiency and its addition can easily lead to a decrease in rubber toughness. To simultaneously achieve the modification goals of reinforcement and anti-aging, the industry typically needs to compound multiple inorganic particles, resulting in a high total addition amount. This not only significantly increases the proportion of inorganic phase in the rubber system and worsens processing fluidity but also easily leads to stress concentration due to uneven dispersion between different particles, severely affecting the overall performance of rubber products.

[0004] While existing technologies attempt to optimize the modification effect of inorganic particles through nano-sizing and surface modification, nano-sized silica and carbon black have high surface energies, leading to more pronounced agglomeration problems. Furthermore, these inorganic particles have dense structures, limiting their contact area with the rubber matrix and resulting in low modification efficiency; higher addition amounts are still required to achieve the desired effect. Simultaneously, the functional limitations of single inorganic particles are difficult to overcome, and compounding introduces new problems such as component compatibility and process complexity, failing to achieve a synergistic improvement in the high strength and aging resistance of styrene-butadiene rubber at low dosages. Therefore, developing a novel inorganic modifier with both efficient reinforcing and UV anti-aging functions, achieving efficient integration with the rubber matrix through structural design, and reducing the total amount of inorganic particles added, has become key to solving the modification challenges of styrene-butadiene rubber. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-strength, aging-resistant styrene-butadiene rubber and its preparation method. Using PVP and polyvinyl alcohol 600 as a composite surfactant, a porous network of ZnO composed of ZnO nanoparticles of approximately 5 nm is synthesized via a hydrothermal method. The ultraviolet absorption-visible light conversion function of the nanoparticles achieves efficient anti-aging. The porous network structure allows the rubber slurry to fully penetrate into its interior, significantly increasing the contact area between ZnO and the rubber, achieving reinforcement and anti-aging at low addition levels. Furthermore, the porous network of ZnO is surface-modified with a silane coupling agent to strengthen its interfacial bonding with the styrene-butadiene rubber matrix, ultimately yielding a high-strength, aging-resistant styrene-butadiene rubber.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A method for preparing high-strength, aging-resistant styrene-butadiene rubber, comprising the following steps: S1. Hydrothermal synthesis of porous network ZnO: Take 2.4~3.6g of zinc acetate dihydrate and add it to 80~100mL of deionized water, stirring until completely dissolved; add 1.5~2.0g of composite surfactant (PVP K30: polyvinyl alcohol 600 = 1:1, mass ratio), and continue stirring for 20~25min; then put it into a reaction vessel, heat the oven temperature to 140~160℃, and react for 8~12h. After the reaction is completed, centrifuge and wash the product, then centrifuge again to obtain porous network ZnO (composed of ZnO nanoparticles of about 6.5nm).

[0007] Zinc acetate dihydrate provides Zn as a zinc source. 2+ The composite surfactants PVP K30 and polyvinyl alcohol 600 synergistically regulate crystal growth, both inhibiting excessive growth of ZnO particles and guiding the aggregation of nanoparticles to form a porous network structure; the hydrothermal environment of 140~160℃ is suitable for ZnO. 2+ Hydrolysis, nucleation, and crystal development provide suitable conditions, while centrifugal washing removes unreacted raw materials and residual surfactants, purifying porous network ZnO. Furthermore, not drying the porous network ZnO after purification avoids ZnO agglomeration.

[0008] S2. Surface-modified porous mesh ZnO mixture: Add 100-120 mL of anhydrous ethanol to the porous network ZnO in step S1, sonicate for 10-15 min, then add 2-3 mL of silane coupling agent KH560, stir for 30-40 min, and remove 4 / 5 mL of anhydrous ethanol by heating to obtain a surface-modified porous network ZnO mixture.

[0009] Anhydrous ethanol is used as the dispersion medium, and ultrasonic vibration can break up the slight agglomerates of ZnO, ensuring uniform particle dispersion. The silane coupling agent KH560 modifies the surface of ZnO, and the organic functional group at the other end can be compatible with the molecular chain of styrene-butadiene rubber, realizing the interfacial bridging between inorganic ZnO and organic rubber matrix. The volatilization of some anhydrous ethanol can increase the ZnO concentration in the mixture, avoiding excessive solvent affecting the rubber plasticizing effect during subsequent mixing.

[0010] S3. Mixing of rubber composite materials: Add 100-120g of styrene-butadiene rubber (SBR 1502) to a mixer and plasticize at 80-90℃ and 60-80r / min for 6-8min. Add the surface-modified porous network ZnO mixture described in step S2, 20-30g of carbon black N330, and 1.2-1.5g of stearic acid, and mix at 90-100℃ for 10-12min. Cool down to 70-80℃, add 2.0-2.5g of sulfur and 1-1.2g of accelerator CZ, and continue mixing for 6-8min to obtain the compound.

[0011] Plasticizing at 80-90℃ can reduce the molecular weight of styrene-butadiene rubber and improve its plasticity, making it easier for fillers to disperse evenly in the subsequent process. Mixing at 90-100℃ can promote the volatilization of residual ethanol in the ZnO mixture and allow carbon black N330 to fully bond with the rubber for reinforcement. Stearic acid, as an activator, can optimize the dispersibility of fillers. Adding sulfur and accelerator CZ after cooling to 70-80℃ can prevent the vulcanizing agent from decomposing and becoming ineffective due to high temperature, ensuring that the subsequent vulcanization reaction is controllable.

[0012] S4. Vulcanization and Post-treatment: The compounded rubber was placed in a flat vulcanizing machine and pre-crosslinked at 130~140℃ and 9MPa for 5~8 minutes. The temperature was then increased to 150~160℃ at 3~5℃ / min and constant at 12MPa for 18~20 minutes. After naturally cooling to room temperature, high-strength and aging-resistant styrene-butadiene rubber was obtained.

[0013] In the low-temperature pre-crosslinking stage, the vulcanizing agent reacts slowly, allowing the rubber to initially form a crosslinking network and fixing the dispersion state of the filler. Gradual heating can avoid the crosslinking rate from being too fast and generating internal stress. 150~160℃ is the optimal temperature for the vulcanization reaction. Combined with a pressure of 12MPa, the crosslinking reaction can be fully and uniformly carried out, forming a dense and stable three-dimensional crosslinking structure. Natural cooling can prevent the rubber products from cracking due to a sudden drop in temperature, ensuring dimensional stability and mechanical properties.

[0014] Beneficial effects of the present invention (1) Low addition amount achieves efficient dual modification: The porous network ZnO synthesized by hydrothermal synthesis of PVP and polyvinyl alcohol 600 composite surfactant is composed of ZnO nanoparticles of about 6.5nm. The porous structure allows the rubber slurry to fully penetrate into its interior, greatly reducing the volume ratio of inorganic ZnO particles. At the same time, the small-sized ZnO nanoparticles can convert ultraviolet light into visible light, achieving ultraviolet anti-aging, reducing the proportion of inorganic phase in the rubber system, and taking into account both processing fluidity and mechanical properties.

[0015] (2) ZnO nanoparticles with a diameter of about 6.5 nm have the function of absorbing ultraviolet light and converting it into visible light, breaking through the limitation of traditional inorganic particles simply physically blocking ultraviolet light and inhibiting the degradation of styrene-butadiene rubber molecular chains by ultraviolet light; at the same time, the porous network structure can further scatter ultraviolet light and improve the rubber's resistance to ultraviolet light and thermo-oxidative aging.

[0016] (3) The surface modification of porous ZnO by silane coupling agent KH560 solves the problems of poor compatibility, easy agglomeration and weak interfacial bonding of traditional inorganic particles with rubber matrix; at the same time, the porous network structure of ZnO fills the gaps between rubber molecular chains, achieving simultaneous improvement of tensile strength and tear strength, and without stress concentration leading to a decrease in toughness. Attached Figure Description

[0017] Figure 1 This is a transmission electron microscope (TEM) image of the porous mesh ZnO synthesized in Example 1; Figure 2 The XRD diffraction pattern of the porous network ZnO synthesized in Example 1; Figure 3 A scanning electron microscope (TEM) image of the ZnO synthesized in Comparative Example 1; Figure 4 The fluorescence spectra of ZnO synthesized in Example 1 and Comparative Example 1 are shown. Figure 5 The UV-Vis absorption spectra of the styrene-butadiene rubber prepared in Example 1 and Comparative Example 1 are shown below. Figure 6 (a)-(c) are the tensile stress-strain curves of styrene-butadiene rubber before and after UV aging for 200 h in Examples 1, 1, and 2, respectively. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to examples. The following content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the concept of the invention, they should all fall within the protection scope of the present invention.

[0019] The preparation method of the present invention will be described below through specific embodiments and comparative examples.

[0020] Example 1 A method for preparing high-strength, aging-resistant styrene-butadiene rubber, comprising the following steps: S1. Hydrothermal synthesis of porous network ZnO: Take 3.0g of zinc acetate dihydrate and add it to 90mL of deionized water. Stir until completely dissolved. Add 1.8g of composite surfactant (PVP K30: polyvinyl alcohol 600 = 1:1, mass ratio) and continue stirring for 22min. Then, put it into a reaction vessel, heat the oven temperature to 150℃, and react for 10h. After the reaction is completed, wash by centrifugation and then centrifuge again to obtain porous network ZnO.

[0021] S2. Surface-modified porous mesh ZnO mixture: Add 110 mL of anhydrous ethanol to the porous network ZnO in step S1, sonicate for 12 min, then add 2.5 mL of silane coupling agent KH560, stir for 35 min, and remove 4 / 5 mL of anhydrous ethanol by heating to obtain a surface-modified porous network ZnO mixture.

[0022] S3. Mixing of rubber composite materials: Add 110g of styrene-butadiene rubber (SBR 1502) to a mixer and plasticize at 85℃ and 70r / min for 7min. Add the surface-modified porous network ZnO mixture described in step S2, 25g of carbon black N330, and 1.3g of stearic acid, and mix at 95℃ for 11min. Cool down to 75℃, add 2.2g of sulfur and 1.1g of accelerator CZ, and continue mixing for 7min to obtain the compound.

[0023] S4. Vulcanization and Post-treatment: The compound was placed in a flat vulcanizing machine and pre-crosslinked at 135℃ and 9MPa for 6 minutes. The temperature was then increased to 155℃ at 4℃ / min and vulcanized at 12MPa for 19 minutes. After naturally cooling to room temperature, high-strength and aging-resistant styrene-butadiene rubber was obtained.

[0024] Example 2 A method for preparing high-strength, aging-resistant styrene-butadiene rubber, comprising the following steps: S1. Hydrothermal synthesis of porous network ZnO: Take 2.4g of zinc acetate dihydrate and add it to 80mL of deionized water. Stir until completely dissolved. Add 1.5g of composite surfactant (PVP K30: polyvinyl alcohol 600 = 1:1, mass ratio) and continue stirring for 20min. Then, put it into a reaction vessel, heat the oven temperature to 140℃, and react for 8h. After the reaction is completed, wash by centrifugation and then centrifuge again to obtain porous network ZnO.

[0025] S2. Surface-modified porous mesh ZnO mixture: Add 100 mL of anhydrous ethanol to the porous network ZnO in step S1, sonicate for 10 min, then add 2 mL of silane coupling agent KH560, stir for 30 min, and remove 4 / 5 mL of anhydrous ethanol by heating to obtain a surface-modified porous network ZnO mixture.

[0026] S3. Mixing of rubber composite materials: Add 100g of styrene-butadiene rubber (SBR 1502) to a mixer and plasticize at 80℃ and 60r / min for 6min; add the surface-modified porous network ZnO mixture described in step S2, 20g of carbon black N330, and 1.2g of stearic acid, and mix at 90℃ for 10min; cool to 70℃, add 2.0g of sulfur and 1g of accelerator CZ, and continue mixing for 6min to obtain the compound.

[0027] S4. Vulcanization and Post-treatment: The compound was placed in a flat vulcanizing machine and pre-crosslinked at 130℃ and 9MPa for 5 minutes. The temperature was then increased to 150℃ at 3℃ / min and vulcanized at 12MPa for 18 minutes. After naturally cooling to room temperature, high-strength aging-resistant styrene-butadiene rubber was obtained.

[0028] Example 3 A method for preparing high-strength, aging-resistant styrene-butadiene rubber, comprising the following steps: S1. Hydrothermal synthesis of porous network ZnO: Take 3.6g of zinc acetate dihydrate and add it to 100mL of deionized water. Stir until completely dissolved. Add 2.0g of composite surfactant (PVP K30: polyvinyl alcohol 600 = 1:1, mass ratio) and continue stirring for 25min. Then, put it into a reaction vessel, heat it to 160℃ in an oven, and react for 12h. After the reaction is completed, wash it by centrifugation and then centrifuge again to obtain porous network ZnO.

[0029] S2. Surface-modified porous mesh ZnO mixture: Add 120 mL of anhydrous ethanol to the porous network ZnO in step S1, sonicate for 15 min, then add 3 mL of silane coupling agent KH560, stir for 40 min, and remove 4 / 5 mL of anhydrous ethanol by heating to obtain a surface-modified porous network ZnO mixture.

[0030] S3. Mixing of rubber composite materials: Add 120g of styrene-butadiene rubber (SBR 1502) to a mixer and plasticize at 90℃ and 80r / min for 8min. Add the surface-modified porous network ZnO mixture described in step S2, 30g of carbon black N330, and 1.5g of stearic acid, and mix at 100℃ for 12min. Cool down to 80℃, add 2.5g of sulfur and 1.2g of accelerator CZ, and continue mixing for 8min to obtain the compound.

[0031] S4. Vulcanization and Post-treatment: The compound was placed in a flat vulcanizing machine and pre-crosslinked at 140℃ and 9MPa for 8 minutes. The temperature was then increased to 160℃ at 5℃ / min and vulcanized at 12MPa for 20 minutes. After naturally cooling to room temperature, high-strength and aging-resistant styrene-butadiene rubber was obtained.

[0032] Comparative Example 1 (Preparation of ZnO using a single surfactant) Hydrothermal synthesis of S1 porous network ZnO: Take 3.0g of zinc acetate dihydrate and add it to 90mL of deionized water. Stir magnetically at room temperature until completely dissolved. Add 1.8g of single PVP K30 surfactant and continue stirring for 25min. The subsequent hydrothermal reaction and centrifugal washing operations are the same as step 1 in Example 1 to obtain ZnO particles.

[0033] The surface-modified ZnO mixture, rubber composite compound mixing, vulcanization and post-treatment of S2 are completely consistent with those in Example 1.

[0034] Comparative Example 2 (Without adding ZnO) S1. Mixing of rubber composite materials: Add 110g of styrene-butadiene rubber (SBR 1502) to a mixer and plasticize at 85℃ and 70r / min for 7min; mix 25g of carbon black N330 and 1.3g of stearic acid at 95℃ for 11min; cool down to 75℃, add 2.2g of sulfur and 1.1g of accelerator CZ, and continue mixing for 7min to obtain the compound.

[0035] S2. Vulcanization and post-treatment: The compound was placed in a flat vulcanizing machine and pre-crosslinked at 135℃ and 9MPa for 6 minutes. The temperature was then increased to 155℃ at 4℃ / min and vulcanized at 12MPa for 19 minutes. After naturally cooling to room temperature, high-strength and aging-resistant styrene-butadiene rubber was obtained.

[0036] Figure 1 Example 1: TEM image of porous network ZnO. It can be clearly observed that ZnO is not a single, dense particle, but rather a continuous and interconnected porous network structure formed by the aggregation of small particles. Combined with subsequent XRD data, the individual particles constituting this network structure are ZnO nanocrystals of approximately 6.5 nm. The porous structure provides ample space for the subsequent penetration of styrene-butadiene rubber slurry, reducing the proportion of inorganic particles and achieving the core structural basis for high-efficiency reinforcement with low doping levels.

[0037] Figure 2 XRD diffraction pattern of ZnO prepared in Example 1. Figure 1 The positions of the characteristic diffraction peaks in the middle section perfectly match those of the ZnO standard PDF card, proving that both sets of experiments successfully synthesized ZnO with complete crystal structure and no impurity phase formation, indicating the strong stability of the hydrothermal synthesis system; based on the Scherrer equation... here, , B and λ represent the X-ray wavelength (1.5418 Å), Bragg diffraction angle, and full width at half maximum (FWHM) of the diffraction peak, respectively. Calculations of the FWHM of the characteristic peak yielded a ZnO crystal size of 6.5 nm for Example 1, demonstrating that the PVP K30 and polyvinyl alcohol 600 composite surfactant can effectively inhibit excessive ZnO grain growth while guiding grain aggregation to form a porous structure.

[0038] Figure 3 Scanning electron microscope (SEM) image of ZnO in Comparative Example 1; Comparative Example 1 uses a single PVP K30 surfactant to prepare ZnO, which consists of randomly stacked solid particles without a through-porous structure, and the gaps between particles are disordered and discontinuous. This is in stark contrast to the porous network morphology of Example 1, which shows that the composite surfactant is the key to constructing the porous network structure, and also explains the structural reasons for the insufficient contact area and low reinforcement efficiency of Comparative Example 1 with the rubber matrix.

[0039] Figure 4Fluorescence spectra of ZnO in Example 1 and Comparative Example 1. When the excitation wavelength was fixed at 365 nm (ultraviolet band), Example 1 showed a strong emission peak at 565 nm (visible band), indicating that it can efficiently convert ultraviolet light into visible light; Comparative Example 1 showed no emission peak, only simple physical absorption of ultraviolet light, and could not achieve light conversion. This shows that the 6.5 nm ZnO nanoparticles in Example 1 have ultraviolet-visible light conversion function. Numerous studies have also reported that small-sized ZnO nanocrystals have light conversion properties and can become ZnO quantum dots. This particle breaks through the limitation of traditional inorganic particles simply physically blocking ultraviolet light.

[0040] Figure 5 The UV-Vis absorption spectra of styrene-butadiene rubber in Example 1 and Comparative Examples 1 and 2 are shown. The styrene-butadiene rubber prepared in Example 1 exhibits significantly higher absorption intensity in the 200-400 nm UV band than that of Comparative Example 1, indicating that the addition of porous network ZnO, combined with its UV light conversion capability, greatly enhances the rubber's efficiency in capturing and converting UV light. Comparative Example 1 (solid ZnO) shows weaker UV absorption than Example 1, suggesting that the porous network structure can further scatter UV light, superimposed with the UV-Vis light conversion function, achieving a dual UV protection effect.

[0041] Figure 6 (a)-(c) Tensile stress-strain curves of rubber before and after 200 hours of UV aging in Examples 1 and 2 (Comparative Examples 1 and 2). (The lower the slope of the stress-strain curve, the better the elasticity and the higher the strength of the rubber).

[0042] Before aging: The tensile strength of Example 1 is higher than that of Comparative Example 1, but slightly lower than that of Comparative Example 2 (reinforced with pure carbon black), indicating that the porous network ZnO does not reduce the basic mechanical properties of rubber at low dosage, and at the same time makes up for the deficiency of single solid ZnO reinforcement. After aging for 200 hours: The tensile strength of Comparative Example 1 (solid ZnO) and Comparative Example 2 (without ZnO) decreased significantly, and the slope of the stress-strain curve became significantly steeper, indicating that the elasticity of the rubber decreased significantly and the hardness increased. The tensile strength of Example 1 decreased less, proving that it has excellent UV aging resistance and achieved a synergy between high strength and aging resistance.

Claims

1. A method for preparing high-strength, aging-resistant styrene-butadiene rubber, characterized in that, Includes the following steps: S1. Hydrothermal synthesis of porous network ZnO: Dissolve 2.4-3.6 g of zinc acetate dihydrate in 80-100 mL of deionized water, add 1.5-2.0 g of composite surfactant and stir for 20-25 min. The composite surfactant is composed of PVP K30 and polyvinyl alcohol 600 in a mass ratio of 1:

1. The mixture is placed in a reaction vessel and reacted at 140-160℃ for 8-12 h. After the reaction, the mixture is centrifuged and washed to obtain undried porous network ZnO. The porous network ZnO is composed of ZnO nanoparticles of about 6.5 nm. S2. Preparation of surface-modified porous network ZnO mixture: Anhydrous ethanol was added to the porous network ZnO obtained in step S1 and ultrasonically dispersed. Silane coupling agent KH560 was added and stirred. The mixture was heated to evaporate and remove 4 / 5 of the volume of anhydrous ethanol, resulting in a surface-modified porous network ZnO mixture. S3. Mixing: After plasticizing, styrene-butadiene rubber is mixed with the mixture obtained in step S2, carbon black N330, and stearic acid. After cooling, sulfur and accelerator CZ are added and the mixture is continued to be mixed to obtain the compound. S4. Vulcanization and post-treatment: The compounded rubber is pre-crosslinked, vulcanized by gradient heating, and naturally cooled to room temperature to obtain high-strength aging-resistant styrene-butadiene rubber.

2. The preparation method according to claim 1, characterized in that, In step S2, the amount of anhydrous ethanol used is 100~120mL, the ultrasonic dispersion time is 10~15min, the amount of silane coupling agent KH560 used is 2~3mL, and the stirring time is 30~40min.

3. The preparation method according to claim 1, characterized in that, In step S3, the amount of styrene-butadiene rubber used is 100~120g, the plasticizing temperature is 80~90℃, the plasticizing speed is 60~80r / min, and the plasticizing time is 6~8min.

4. The preparation method according to claim 1, characterized in that, In step S3, the mixing temperature of the added mixture, carbon black N330, and stearic acid is 90~100℃, and the mixing time is 10~12min; after cooling, the mixing temperature is 70~80℃, and the mixing time is 6~8min.

5. The preparation method according to claim 1, characterized in that, In step S3, the amount of carbon black N330 is 20~30g, the amount of stearic acid is 1.2~1.5g, the amount of sulfur is 2.0~2.5g, and the amount of accelerator CZ is 1~1.2g.

6. The preparation method according to claim 1, characterized in that, In step S4, the pre-crosslinking temperature is 130~140℃, the pre-crosslinking pressure is 9MPa, and the pre-crosslinking time is 5~8min; the gradient heating rate is 3~5℃ / min, the vulcanization temperature is 150~160℃, the vulcanization pressure is 12MPa, and the vulcanization time is 18~20min.

7. A high-strength, aging-resistant styrene-butadiene rubber, characterized in that, The high-strength, aging-resistant styrene-butadiene rubber is prepared by the preparation method according to any one of claims 1 to 6.

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