A tire sidewall rubber composition, and a method of making and using the same

Abstract

The present application belongs to the field of tire manufacturing, and particularly relates to a tire sidewall rubber composition and a preparation method and application thereof. The tire sidewall rubber composition is composed of the following raw materials in parts by mass: natural rubber 10-100 parts by mass, butadiene rubber 10-100 parts by mass, carbon black 30-80 parts by mass, zinc oxide 1-15 parts by mass, rubber oil 3-15 parts by mass, fatty acid compound 1-5 parts by mass, protective wax 1-4 parts by mass, antioxidant 0.5-4 parts by mass, sulfur powder 1-8 parts by mass, accelerator 0.5-3 parts by mass, anti-scorching agent 0.05-0.5 parts by mass, pyrazolone heterocyclic compound 0.3-3 parts by mass, and phenolic compound 0.5-5 parts by mass. The pyrazolone heterocyclic compound and the phenolic compound synergize with the traditional antioxidant, make up for the deficiency of the traditional antioxidant, and significantly improve the comprehensive performance of the entire rubber composite material, thereby effectively prolonging the service life of the tire sidewall. The tire manufactured by using the rubber composition has excellent durability and use safety.

Description

Technical Field

[0001] This invention belongs to the field of tire manufacturing, specifically relating to a tire sidewall rubber composition, its preparation method, and its application. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] As a critical component directly exposed to the external environment, the tire sidewall is subjected to harsh environmental factors such as high temperature, ozone, and ultraviolet radiation for extended periods. This leads to the breakage, cross-linking, or oxidative degradation of rubber molecular chains, resulting in cracking and severely impacting tire lifespan and driving safety. Currently, the industry primarily slows down the aging process by adding antioxidants (such as amine compounds) and anti-ozone additives (such as protective waxes) to rubber formulations. However, existing technologies still have significant drawbacks: on the one hand, traditional amine antioxidants are prone to migration failure under high-temperature conditions, causing their protective effect to gradually diminish over time; on the other hand, the carbon distribution of protective waxes is difficult to maintain a constant migration rate across different temperature ranges, resulting in unstable protective effects. Furthermore, under the synergistic effect of ozone and ultraviolet radiation, the rubber surface is susceptible to photo-oxidation and ozone decomposition reactions, while existing additives have limited anti-aging properties, making it difficult to maintain the mechanical properties and weather resistance of rubber in the long term.

[0004] Therefore, there is an urgent need to develop a new rubber formulation that can significantly improve the tire sidewall’s protection against the combined effects of high temperature, ozone and ultraviolet radiation by optimizing the antioxidant system or introducing highly efficient and stable anti-aging components, while ensuring long-term durability, thereby meeting the tire industry’s demand for high-performance and long-life products. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a tire sidewall rubber composition, its preparation method, and its application. The rubber composition provided by this invention can significantly improve the tire sidewall's protective capabilities under the combined effects of high temperature, ozone, and ultraviolet radiation, while ensuring long-term durability.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides a tire sidewall rubber composition comprising: a pyrazolone heterocyclic compound and a phenolic compound, wherein the pyrazolone heterocyclic compound is 1-phenyl-3-methyl-5-pyrazolone, and its structural formula is shown in Formula I: The phenolic compound is D-α-tocopherol.

[0008] Pyrazolone heterocyclic compounds contain active groups capable of scavenging free radicals, effectively interrupting the oxidation reaction chain initiated by free radicals and thus delaying the aging process of rubber. Phenolic compounds, on the one hand, possess excellent antioxidant properties, stabilizing peroxides in rubber and preventing their decomposition from damaging the rubber molecular chain; on the other hand, phenolic compounds also impart better flexibility to rubber, further enhancing its crack resistance and durability. These two compounds, working synergistically with traditional antioxidants, can form a more efficient antioxidant system.

[0009] In some embodiments, the tire sidewall rubber composition comprises the following components: natural rubber, butadiene rubber, carbon black, zinc oxide, rubber oil, fatty acid compound, protective wax, antioxidant, sulfur powder, accelerator, scorch inhibitor, 1-phenyl-3-methyl-5-pyrazolone, and D-α-tocopherol.

[0010] In some embodiments, the tire sidewall rubber composition comprises the following raw materials in parts by weight:

[0011] Natural rubber 10-100 parts by weight, butadiene rubber 10-100 parts by weight, carbon black 30-80 parts by weight, zinc oxide 1-15 parts by weight, rubber oil 3-15 parts by weight, fatty acid compounds 1-5 parts by weight, protective wax 1-4 parts by weight, antioxidant 0.5-4 parts by weight, sulfur powder 1-8 parts by weight, accelerator 0.5-3 parts by weight, scorch inhibitor 0.05-0.5 parts by weight, pyrazolone heterocyclic compounds 0.3-3 parts by weight, phenolic compounds 0.5-5 parts by weight.

[0012] Furthermore, the natural rubber is STR20, with 1.5-3.2% acetone extract; preferably 20-80 parts by weight of natural rubber, more preferably 40-60 parts by weight.

[0013] Furthermore, the butadiene rubber is BR9000, preferably 20-80 parts by weight, more preferably 50-70 parts by weight.

[0014] Furthermore, the carbon black is at least one of N330 and N375; preferably 40-70 parts by weight; more preferably 45-60 parts by weight.

[0015] Furthermore, the zinc oxide is obtained by indirect zinc oxide production, with a zinc oxide content ≥99.50% and a specific surface area of ​​5.0±1.0 m². 2 / g; zinc oxide is preferably 2-10 parts by weight, more preferably 3-5 parts by weight.

[0016] Furthermore, the rubber oil has the following properties: specific gravity (15℃) 0.918-0.978, aniline point ≤90℃, total sulfur content ≤0.7%, and viscosity at 100℃ 16-28 mm. 2 / s, flash point (open cup) ≥210℃, VGC 0.880±0.030, cycloalkanes C N ≥40%; preferably 4-10 parts by weight of rubber oil, more preferably 5-8 parts by weight.

[0017] Furthermore, the fatty acid compound is stearic acid, with an iodine value ≤ 8.0 g / 100 g, an acid value of 196-211 mg / g, a freezing point of 52-60 °C, a saponification index of 197-212 mg KOH / g, and a C 18 +C 16 Content ≥88%; preferably, stearic acid is 2-4 parts by weight.

[0018] Furthermore, the protective wax has a solidification point of 64-70℃, contains 53-60% n-alkanes, and has a C content of [missing information]. 35 -C 39 Content 22±4%, C 30 -C 34 Content 42±6%, C 25 -C 29 Content 22±4%; protective wax is preferably 1-2 parts by weight.

[0019] Furthermore, the antioxidant 6PPD has an N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine content ≥96.0%; the antioxidant is preferably present in an amount of 0.5-2 parts by weight.

[0020] Furthermore, the sulfur powder is soluble sulfur with a purity >99.95% and a DSC melting point of 119.0±2.5℃; preferably 1-5 parts by weight of sulfur powder, more preferably 1.5-3 parts by weight.

[0021] Furthermore, the accelerator is at least one of accelerator NS, accelerator CZ, accelerator DZ, and accelerator DM; preferably, the accelerator is 1-2 parts by weight.

[0022] Furthermore, the anti-scorching agent is CTP, with a DSC melting point of 93±3℃ and toluene insoluble matter ≤0.3%, and the anti-scorching agent is preferably 0.1-0.3 parts by weight.

[0023] Furthermore, the pyrazolone heterocyclic compound is preferably present in 0.5-2 parts by mass, more preferably in 0.8-1.2 parts by mass.

[0024] Furthermore, the phenolic compound is preferably 1-4 parts by weight, more preferably 2-3 parts by weight.

[0025] Secondly, the present invention provides a method for preparing a tire sidewall rubber composition, comprising the following steps:

[0026] (1) First stage masterbatch M1: Natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax and antioxidant are added to the internal mixer and mixed. Then rubber oil is added, and the mixture is discharged to obtain the first stage masterbatch M1.

[0027] (2) Second-stage masterbatch M2: Add the first-stage masterbatch M1 into the internal mixer, then add the remaining carbon black and pyrazolone heterocyclic compounds in the formula and mix, and finally add phenolic compounds and mix and discharge to obtain the first-stage masterbatch M2.

[0028] (3) Final rubber mixing: Add the second-stage masterbatch rubber M2, sulfur powder, accelerator, and anti-scorching agent CTP to the internal mixer for mixing, discharge the rubber, and press into sheets for the next process of tire tread production.

[0029] Furthermore, the specific steps in the preparation method of the above-mentioned tire sidewall rubber composition include:

[0030] S1, First-stage masterbatch M1: Add natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax, and antioxidant to the internal mixer and mix for 20-50 seconds; lift the top plug and add rubber oil; press the top plug to maintain the rubber compound temperature at 140-155℃, lift the top plug; press the top plug to maintain the rubber compound temperature at 162±2℃, and empty the rubber compound in the internal mixer to the tableting machine; the tableting machine presses the first-stage masterbatch M1 into tablets, cools and stands for 8 hours for later use.

[0031] S2, Second-stage Masterbatch M2: Add the first-stage masterbatch M1 to the internal mixer and press down the top plug until the pressure reaches the set value and hold for 10-20 seconds; lift the top plug and add the remaining carbon black and pyrazolone heterocyclic compounds in the formula; press the top plug and hold for 30-50 seconds; lift the top plug and add phenolic compounds and hold for 5-10 seconds; press the top plug until the material temperature in the internal mixer reaches 150±5℃, then empty the rubber compound in the internal mixer to the tableting machine; the tableting machine will press the second-stage masterbatch M2 into tablets, cool and let stand for 8 hours for later use.

[0032] S3, Final Rubber Mixture: Add the above-mentioned M2, sulfur powder, accelerator, and scorching inhibitor CTP to the internal mixer. Press down the top plug and hold for 20-50 seconds until the pressure reaches the set value, with a rotation speed of 22-30 rpm. Lift the top plug and hold for 2-10 seconds, with a rotation speed of 22-30 rpm. Press down the top plug and hold for 10-30 seconds, adjusting the rotation speed to 15-20 rpm. Lift the top plug and hold for 2-10 seconds, with a rotation speed of 22-30 rpm. Press down the top plug until the temperature reaches 105±5℃, then discharge the rubber to the open mill for sheeting, for the next process of tire tread production.

[0033] Furthermore, in step S1, the rotation speed is 30-50 rpm, the pressure of the top bolt is 0.5-0.6 MPa, and the water temperature in the mixing chamber is controlled at 35±5℃.

[0034] Furthermore, in step S2, the rotation speed is 30-50 rpm, the pressure of the top bolt is 0.5-0.6 MPa, and the water temperature in the mixing chamber is controlled at 35±5℃.

[0035] Furthermore, in step S3, the pressure of the top bolt is 0.4-0.5 MPa, and the water temperature in the mixing chamber is controlled at 30±5℃.

[0036] Thirdly, the present invention provides the application of the tire sidewall rubber composition described in the first aspect or the tire sidewall rubber composition prepared in the second aspect in tire manufacturing.

[0037] The beneficial effects of this invention are as follows:

[0038] 1. This invention provides a tire sidewall rubber composition, wherein the pyrazolone heterocyclic compound contains active groups capable of capturing free radicals, effectively interrupting the oxidation reaction chain initiated by free radicals, thereby delaying the aging process of the rubber. Phenolic compounds, on the one hand, possess excellent antioxidant properties, stabilizing peroxides in rubber and preventing their decomposition from damaging the rubber molecular chains; on the other hand, phenolic compounds also impart better flexibility to the rubber, further enhancing its crack resistance and durability.

[0039] 2. The synergistic effect of pyrazolone heterocyclic compounds and phenolic compounds makes up for the shortcomings of traditional antioxidants and significantly improves the overall performance of the entire rubber composite material, thereby effectively extending the service life of the tire sidewall and solving the shortcomings of existing tires in terms of weather resistance.

[0040] 3. The method for preparing the tire sidewall rubber composition of the present invention is simple, practical, and easy to promote. Detailed Implementation

[0041] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] The present invention will be further described in detail below with reference to specific embodiments.

[0043] Example 1

[0044] A tire sidewall rubber composition, comprising the following raw materials in parts by weight:

[0045] Natural rubber STR20 40 parts by weight, butadiene rubber BR9000 60 parts by weight, carbon black N375 45 parts by weight, zinc oxide 3.5 parts by weight, rubber oil V600 5 parts by weight, stearic acid 2 parts by weight, protective wax 1.5 parts by weight, antioxidant 6PPD 1.2 parts by weight, sulfur powder 1.7 parts by weight, accelerator DZ 1.5 parts by weight, scorch inhibitor CTP 0.2 parts by weight, 1-phenyl-3-methyl-5-pyrazolone 0.8 parts by weight, D-α-tocopherol 3 parts by weight.

[0046] Preparation method of tire sidewall rubber composition:

[0047] (1) First stage masterbatch M1: The first stage masterbatch is made using a GK420 internal mixer; natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax, antioxidant, and rubber oil are used as the first stage masterbatch materials; the internal mixer speed is 45 rpm, the top jack pressure is 0.55 MPa, and the water temperature in the mixing chamber is controlled at 35℃.

[0048] Add the above-mentioned natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax, and antioxidant to the internal mixer, press down the top plug, and hold the pressure at the set value for 40 seconds.

[0049] Lift the top bolt and add rubber oil;

[0050] Press the top bolt down until the rubber compound temperature reaches 150°C, then lift the top bolt;

[0051] Press the top bolt and hold until the rubber compound temperature reaches 162°C, then empty the rubber compound from the internal mixer into the twin-screw extruder and tablet press.

[0052] The twin-screw extruder tablets press a section of masterbatch rubber M1 into tablets, which are then cooled and left to stand for 8 hours for later use (parameter settings: the distance between the two rollers is set to 10cm, the roller temperature is 95℃, and the screw temperature is 85℃).

[0053] (2) Second-stage masterbatch M2: The second-stage masterbatch is made using a GK420 internal mixer; the first-stage masterbatch M1, the remaining carbon black, pyrazolone heterocyclic compounds, and phenolic compounds in the formula are used as materials for the second-stage masterbatch M2; the internal mixer speed is 35 rpm, the top jack pressure is 0.55 MPa, and the water temperature in the mixing chamber is controlled at 35℃.

[0054] Add the above M1 to the internal mixer and press down the top bolt until the pressure reaches the set value and hold for 20 seconds;

[0055] Lift the top plug and add the remaining carbon black and pyrazolone heterocyclic compound from the formula;

[0056] Press down the top bolt and hold for 40 seconds;

[0057] Lift the top plug, add the phenolic compound and hold for 5 seconds;

[0058] Press the top bolt until the material temperature in the internal mixer reaches 150°C, then discharge the rubber material in the internal mixer to the twin-screw extruder tablet press.

[0059] The twin-screw extruder tablets compress and cool the second-stage masterbatch rubber M2 into tablets for 8 hours for later use (parameter settings: the distance between the two rollers is set to 10cm, the roller temperature is 95℃, and the screw temperature is 85℃).

[0060] (3) Final rubber: The final rubber is made using a GK255 internal mixer; the second-stage masterbatch M2, sulfur powder, accelerator, and anti-scorching agent CTP are the materials for the final rubber; the internal mixer speed is 25rpm / 18rpm, the top jack pressure is 0.45Mpa, and the water temperature in the mixing chamber is controlled at 30℃.

[0061] Add the above-mentioned M2, sulfur powder, accelerator, and anti-scorching agent CTP to the internal mixer, press down the top plug, and hold the pressure at the set value for 30 seconds.

[0062] Lift the top bolt and hold for 5 seconds;

[0063] Press the top bolt and hold for 20 seconds; adjust the speed of the internal mixer to 18 rpm.

[0064] Lift the top bolt and hold for 5 seconds;

[0065] Press the top bolt until the temperature reaches 105℃, then discharge the glue to the open mill for sheeting, which will be used for the next process of tire tread production.

[0066] Comparative Example 1

[0067] The difference from Example 1 is that 1-phenyl-3-methyl-5-pyrazolone and D-α-tocopherol were not added.

[0068] Comparative Example 2

[0069] The difference from Example 1 is that D-α-tocopherol was not added.

[0070] Comparative Example 3

[0071] The difference from Example 1 is that 1.2 parts by weight of 1-phenyl-3-methyl-5-pyrazolone were added and D-α-tocopherol was not added.

[0072] Comparative Example 4

[0073] The difference from Example 1 is that 1-phenyl-3-methyl-5-pyrazolone was not added and 2 parts by weight of D-α-tocopherol were added.

[0074] Comparative Example 5

[0075] The difference from Example 1 is that 1-phenyl-3-methyl-5-pyrazolone was not added.

[0076] Performance testing:

[0077] Test sample preparation standard: GB / T 2941 "General procedures for sample preparation and conditioning of physical test methods for rubber".

[0078] Tensile fatigue test method: GB / T 1688 "Determination of tensile fatigue of vulcanized rubber".

[0079] Tensile properties were tested in accordance with GB / T528-2009.

[0080] The vulcanization conditions are: 150℃ for 3 minutes.

[0081] Stress at constant elongation: The performance data of Examples 1 and Comparative Examples 1-5 are expressed as an index, with the index value of Comparative Example 1 set to 100. For Examples 1 and Comparative Examples 2-5, the lower the value of 100, the lower the stress at constant elongation.

[0082] Elongation, tensile strength, and tensile fatigue: The performance data of Example 1 and Comparative Examples 1-5 are expressed as indices, with the elongation index of Comparative Example 1 being 100. For Examples 1 and Comparative Examples 2-5, a higher value of 100 indicates a higher elongation.

[0083] Evaluation of stress data after high temperature aging: The performance data of Example 1 and Comparative Examples 1-5 after aging are compared with the data of the corresponding examples before aging. The higher the index, the greater the performance increase, which means that the performance is worse after aging.

[0084] Evaluation of elongation, tensile strength and tensile fatigue data after high temperature aging: The performance data of Example 1 and Comparative Examples 1-5 after aging are compared with the data of the corresponding examples before aging. The higher the index, the lower the performance decline and the better the performance is maintained after aging.

[0085] Example 1 and Comparative Examples 1-5 were all tested according to the above-described performance testing method. The test results are shown in Table 1:

[0086] Table 1

[0087]

[0088]

[0089] Compared to Comparative Example 1, Example 1 contained phenolic compounds and pyrazolone heterocyclic compounds. Before aging, Example 1 showed significantly improved elongation and tensile fatigue properties compared to Comparative Example 1, while its stress at a given elongation and tensile strength were comparable. Therefore, in its initial state, the product prepared in Example 1 possessed better flexibility and ductility, capable of withstanding greater deformation without failure, and exhibited superior fatigue resistance under cyclic loading of repeated stretching and relaxation.

[0090] After aging, the performance retention of Example 1 was significantly improved compared to Comparative Example 1. After aging treatment, Example 1 still maintained high mechanical properties, especially elongation, tensile strength and tensile fatigue properties, and had better durability and stability during long-term use, effectively resisting the damage to the rubber network structure caused by environmental factors.

[0091] Comparative Examples 2 and 3 contained pyrazolone heterocyclic compounds but no phenolic compounds. Compared to Comparative Example 1, Comparative Examples 2 and 3 showed lower stress at a given elongation and significantly higher elongation. This indicates that under the same tensile conditions, the materials of Comparative Examples 2 and 3 exhibit higher flexibility and ductility, capable of withstanding greater deformation without fracture. They also showed a significant advantage in tensile fatigue performance compared to Comparative Example 1, demonstrating superior fatigue resistance. Comparative Examples 2 and 3 showed a significant improvement in performance retention after aging compared to Comparative Example 1; after a certain period of aging, the materials of Comparative Examples 2 and 3 still maintained high mechanical properties, exhibiting better durability and stability.

[0092] Compared to Comparative Example 2, Comparative Example 3 significantly improved the elongation and tensile fatigue properties of the rubber composite material by increasing the amount of pyrazolone heterocyclic compound added, while also improving the retention rate of various properties after aging treatment. However, this adjustment had a certain negative impact on the tensile strength of the material. Specifically, as the amount of pyrazolone heterocyclic compound added increased, its effect on the stress at a given elongation became more significant, and the improvement on elongation was also more pronounced.

[0093] Phenolic compounds were added to the products of Comparative Examples 4 and 5, but no pyrazolone heterocyclic compounds were added. Compared to Comparative Example 1, the elongation of Comparative Examples 4 and 5 was slightly reduced before aging, but other properties were comparable to those of Comparative Example 1. This indicates that in the initial state, although the elongation was slightly reduced, the overall performance was not significantly affected and remained at a level similar to the comparative example; after aging, the performance retention of Comparative Examples 4 and 5 was significantly improved compared to Comparative Example 1. After aging treatment, Comparative Examples 4 and 5 were able to better maintain their mechanical properties, exhibiting superior durability and stability.

[0094] Compared to Comparative Examples 2 and 3, Example 1 achieved a significant improvement in stress at a given elongation and tensile strength, effectively compensating for the deficiencies of Comparative Examples 2 and 3 in these two performance indicators. Furthermore, compared to Comparative Example 1, Example 1 exhibited superior performance in elongation, tensile fatigue properties, and the retention rate of various properties after aging treatment, achieving a significant improvement. In addition, compared to Comparative Examples 4 and 5, Example 1 also achieved a significant improvement in elongation and tensile fatigue properties, compensating for the deficiencies of Comparative Examples 4 and 5 in these aspects.

[0095] Comparative analysis of Comparative Examples 2, 3, 4, and 5 with Example 1:

[0096] Comparative Examples 2 and 3, without the addition of phenolic compounds, exhibited better elongation and significantly lower stress at a given elongation than Example 1 in their initial state. However, after a period of aging treatment, Example 1 demonstrated superior durability and stability, while the performance of Comparative Examples 2 and 3 declined in comparison.

[0097] Comparative Examples 4 and 5, which did not contain pyrazolone heterocyclic compounds, exhibited lower elongation and fatigue properties than Example 1. Similarly, after a certain period of aging treatment, Example 1 demonstrated significantly better durability and stability than Comparative Examples 4 and 5.

[0098] In summary, pyrazolone heterocyclic compounds significantly improve the flexibility and ductility of composite materials, but have a significant impact on the tensile stress at a given elongation. The addition of phenolic compounds, however, does not negatively affect the tensile stress at a given elongation; on the contrary, it effectively compensates for the negative impact of pyrazolone heterocyclic compounds on the tensile stress at a given elongation, while significantly improving the durability and stability after aging treatment. When pyrazolone heterocyclic compounds and phenolic compounds are used together in the same formulation, they exhibit excellent synergistic effects, effectively compensating for the shortcomings of adding either compound individually, thereby comprehensively improving the overall performance of the composite material.

[0099] In summary, the combination of 1-phenyl-3-methyl-5-pyrazolone and D-α-tocopherol in Example 1 demonstrates comprehensive performance optimization capabilities. Through synergistic effects, it achieves a balance between stress at a given elongation, elongation, and tensile fatigue properties, significantly improving the performance retention of the rubber composite material after aging. This provides an effective solution for the high-performance development of rubber composite materials.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tire sidewall rubber composition, characterized in that, It includes pyrazolone heterocyclic compounds and phenolic compounds, wherein the pyrazolone heterocyclic compound is 1-phenyl-3-methyl-5-pyrazolone; and the phenolic compound is D-α-tocopherol; The tire sidewall rubber composition comprises the following raw materials in parts by weight: 10-40 parts by weight of natural rubber, 60-100 parts by weight of butadiene rubber, 30-80 parts by weight of carbon black, 1-15 parts by weight of zinc oxide, 3-15 parts by weight of rubber oil, 1-5 parts by weight of fatty acid compound, 1-4 parts by weight of protective wax, 0.5-4 parts by weight of antioxidant, 1-8 parts by weight of sulfur powder, 0.5-3 parts by weight of accelerator, 0.05-0.5 parts by weight of scorch inhibitor, 0.3-3 parts by weight of pyrazolone heterocyclic compound, and 0.5-5 parts by weight of phenolic compound.

2. The tire sidewall rubber composition according to claim 1, characterized in that, The amount of pyrazolone heterocyclic compounds is 0.5-2 parts by mass, and the amount of phenolic compounds is 1-4 parts by mass.

3. The tire sidewall rubber composition according to claim 2, characterized in that, The amount of pyrazolone heterocyclic compounds is 0.8-1.2 parts by mass, and the amount of phenolic compounds is 2-3 parts by mass.

4. The tire sidewall rubber composition according to claim 1, characterized in that, The fatty acid compound is stearic acid.

5. The tire sidewall rubber composition according to claim 1, characterized in that, The antioxidant is 6PPD; the scorching inhibitor is CTP.

6. The tire sidewall rubber composition according to claim 1, characterized in that, Carbon black is at least one of N330 and N375.

7. The tire sidewall rubber composition according to claim 1, characterized in that, The accelerator is at least one of accelerator NS, accelerator CZ, accelerator DZ, and accelerator DM.

8. The method for preparing the tire sidewall rubber composition according to claim 1, characterized in that, Includes the following steps: (1) First stage masterbatch M1: Natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, fatty acid compounds, protective wax and antioxidant are added to the internal mixer and mixed. Then rubber oil is added, and the mixture is discharged to obtain the first stage masterbatch M1. (2) Second-stage masterbatch M2: Add the first-stage masterbatch M1 to the internal mixer, then add the remaining carbon black and pyrazolone heterocyclic compounds in the formula and mix, and finally add phenolic compounds and mix and discharge to obtain the first-stage masterbatch M2. (3) Final rubber mixing: Add the second-stage masterbatch rubber M2, sulfur powder, accelerator, and anti-scorching agent CTP to the internal mixer for mixing, discharge the rubber, and press into sheets for the next process of tire tread production.

9. The use of the tire sidewall rubber composition according to any one of claims 1-7 or the tire sidewall rubber composition prepared according to claim 8 in tire manufacturing.

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