Tire sidewall rubber composition as well as preparation method and application thereof

Abstract

The invention belongs to the field of tire manufacturing, and particularly relates to a tire sidewall rubber composition as well as a preparation method and application thereof. The tire sidewall rubber composition is prepared from the following raw materials in parts by mass: 10 to 100 parts of natural rubber, 10 to 100 parts of butadiene rubber, 30 to 80 parts of carbon black, 1 to 15 parts of zinc oxide, 3 to 15 parts of rubber oil, 1 to 5 parts of fatty acid compound, 1 to 4 parts of protective wax, 0.5 to 4 parts of anti-aging agent, 1 to 8 parts of sulfur powder and 0.5 to 3 parts of accelerant. 0.05-0.5 part by mass of a scorch retarder, 0.3-3 parts by mass of a pyrazolone heterocyclic compound and 0.5-5 parts by mass of a phenolic compound. Wherein the pyrazolone heterocyclic compound, the phenolic compound and the traditional anti-aging agent have a synergistic effect, so that the defects of the traditional anti-aging agent are overcome, and the comprehensive performance of the whole rubber composite material is also remarkably improved, so that the service life of the tire sidewall of the tire is effectively prolonged; the tire sidewall has excellent durability and use safety.

Description

Technical Field

[0001] The present invention belongs to the field of tire manufacturing, and in particular relates to a tire sidewall rubber composition and a preparation method and application thereof. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] As a key part directly exposed to the external environment, the tire sidewall is affected by harsh environmental factors such as high temperature, ozone, and ultraviolet rays for a long time, which can lead to breakage, cross-linking or oxidative degradation of the rubber molecular chain, and then cause cracks, which seriously affect the service life and driving safety of the tire. At present, the industry mainly delays the aging process by adding antioxidants (such as amine compounds) and anti-ozonation additives (such as protective wax) to the rubber formula. However, the existing technology still has significant defects: on the one hand, traditional amine antioxidants are prone to migration failure under high temperature conditions, resulting in the protective effect gradually decaying with time; on the other hand, the carbon distribution of the protective wax is difficult to meet the constant migration speed in different temperature ranges, resulting in unstable protective effect. In addition, under the synergistic effect of ozone and ultraviolet rays, the rubber surface is prone to photooxidation and ozone cracking reactions, and the anti-aging performance of existing additives is limited, making it difficult to maintain the mechanical properties and weather resistance of the rubber for a long time.

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

[0005] To address the shortcomings of the prior art, the present invention provides a tire sidewall rubber composition, its preparation method, and its application. The rubber composition provided by the present invention can significantly enhance the tire sidewall's ability to protect against the combined effects of high temperature, ozone, and ultraviolet radiation, while ensuring long-term durability.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[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 has the structural formula shown in Formula I: The phenolic compound is D-α tocopherol.

[0008] Pyrazolone heterocyclic compounds contain active groups that can capture free radicals, effectively interrupting the oxidation reaction chain initiated by free radicals, thereby slowing the aging process of rubber. Phenolic compounds possess excellent antioxidant properties, stabilizing peroxides in rubber and preventing their decomposition and damage to the rubber's molecular chains. Furthermore, phenolic compounds impart greater flexibility to rubber, further enhancing its crack resistance and durability. These two compounds work synergistically with traditional antioxidants to form a more effective antioxidant system.

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

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

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

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

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

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

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

[0016] Furthermore, rubber oil, specific gravity (15°C) 0.918-0.978, aniline point ≤ 90°C, total sulfur content ≤ 0.7%, viscosity at 100°C 16-28mm 2 / s, flash point (open) ≥ 210 ° C, VGC0.880 ± 0.030, cycloalkane C N ≥40%; rubber oil is preferably 4-10 parts by mass, more preferably 5-8 parts by mass.

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

[0018] Furthermore, the protective wax solidification point is 64-70°C, normal alkanes are 53-60%, C 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 mass.

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

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

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

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

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

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

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

[0026] (1) Masterbatch M1: natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax, and antioxidant are added to an internal mixer and mixed, and then rubber oil is added and mixed to obtain masterbatch M1;

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

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

[0029] Furthermore, the preparation method of the tire sidewall rubber composition comprises the following specific steps:

[0030] S1. First-stage masterbatch M1: Add natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax and antioxidant into an internal mixer and mix for 20-50 seconds; lift the top plug and add rubber oil; press and hold the top plug until the temperature of the rubber compound reaches 140-155°C, then lift the top plug; press and hold the top plug until the temperature of the rubber compound reaches 162±2°C, and empty the rubber compound in the internal mixer into the tablet press; tablet the first-stage masterbatch M1 on the tablet press and let it cool for 8 hours for standby use.

[0031] S2. Second-stage masterbatch M2: Add the first-stage masterbatch M1 into the internal mixer, press down the top plug and wait for the pressure to reach the set value and hold it for 10-20 seconds; lift the top plug and add the remaining carbon black and pyrazolone heterocyclic compound in the formula; press the top plug and hold it for 30-50 seconds; lift the top plug and add the phenol compound and hold it for 5-10 seconds; press the top plug and when the material temperature in the internal mixer reaches 150±5℃, empty the rubber material in the internal mixer into the tablet press; the tablet press will tablet the second-stage masterbatch M2 and cool it for 8 hours for standby use.

[0032] S3, final rubber mixing: add the above M2, sulfur powder, accelerator, and anti-scorch agent CTP into the internal mixer, press down the upper push pin until the pressure reaches the set value and hold it for 20-50 seconds, and the speed is 22-30rpm; lift the upper push pin and hold it for 2-10 seconds, and the speed is 22-30rpm; press the push pin and hold it for 10-30 seconds, and adjust the speed to 15-20rpm; lift the push pin and hold it for 2-10 seconds, and the speed is 22-30rpm; press the push pin until the temperature reaches 105±5℃, discharge the rubber to the open mixer and press it into sheets for the next process of tread production.

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

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

[0035] Furthermore, in step S3, the upper ejector pressure is 0.4-0.5 MPa, and the water temperature in the mixing chamber is controlled at 30±5°C.

[0036] In a third aspect, the present invention provides use 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 the present invention are:

[0038] 1. The present invention relates to 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 slowing the aging process of the rubber. Phenolic compounds have excellent antioxidant properties, stabilizing peroxides in the rubber and preventing their decomposition from damaging the rubber molecular chains. Furthermore, phenolic compounds impart greater 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 weather resistance.

[0040] 3. The preparation method of the tire sidewall rubber composition of the present invention is simple, highly practical and easy to promote. DETAILED DESCRIPTION

[0041] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

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

[0043] Example 1

[0044] A tire sidewall rubber composition is composed of the following raw materials in parts by weight:

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

[0046] Preparation method of tire sidewall rubber composition:

[0047] (1) Primary masterbatch M1: A primary masterbatch was prepared using a GK420 internal mixer; natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax, antioxidant, and rubber oil were used as primary masterbatch materials; the internal mixer speed was 45 rpm, the upper bolt pressure was 0.55 MPa, and the mixing chamber water temperature was controlled at 35°C;

[0048] Add the above natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax, and antioxidant into an internal mixer, press the top bolt, and hold for 40 seconds until the pressure reaches the set value;

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

[0050] Press the top bolt and hold it until the temperature of the rubber compound reaches 150℃, then lift the top bolt;

[0051] Press the top bolt and maintain the temperature until the compound reaches 162℃, then drain the compound in the internal mixer to the twin-screw extruder;

[0052] A twin-screw extruder was used to press a section of masterbatch M1 into tablets, which were cooled and left for 8 hours for standby use (parameter settings: the distance between the two rollers was set to 10 cm, the roller temperature was 95°C, and the screw temperature was 85°C);

[0053] (2) Second stage masterbatch M2: The second stage masterbatch was prepared using an internal mixer GK420; the first stage masterbatch M1, the remaining carbon black in the formula, the pyrazolone heterocyclic compound, and the phenolic compound were used as the materials for the second stage masterbatch M2; the internal mixer speed was 35 rpm, the upper bolt pressure was 0.55 MPa, and the water temperature in the mixing chamber was controlled at 35°C;

[0054] Add the above M1 into the internal mixer, press down the top bolt and wait for the pressure to reach the set value and hold for 20 seconds;

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

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

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

[0058] Press the top bolt until the material temperature in the internal mixer reaches 150℃, then drain the rubber material in the internal mixer into the twin-screw extruder;

[0059] The twin-screw extruder tablet press cools the second-stage masterbatch M2 and leaves it for 8 hours for standby use (parameter settings: the distance between the two rollers is set to 10 cm, the roller temperature is 95°C, and the screw temperature is 85°C);

[0060] (3) Final mixing: The final mixing was carried out using an internal mixer GK255; the second stage masterbatch M2, sulfur powder, accelerator, and scorch retarder CTP were used as the materials for the final mixing; the internal mixer speed was 25 rpm / 18 rpm, the upper bolt pressure was 0.45 MPa, and the water temperature in the mixing chamber was controlled at 30°C;

[0061] Add the above M2, sulfur powder, accelerator, and scorch retarder CTP into the internal mixer, press the top plug and hold it for 30 seconds until the pressure reaches the set value;

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

[0063] Press the top bolt and hold for 20 seconds, then adjust the mixer speed to 18 rpm;

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

[0065] Press the top bolt until the temperature reaches 105℃, discharge the rubber to the open mixer and press it into sheets for the next process of 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 mass of 1-phenyl-3-methyl-5-pyrazolone is added and D-α-tocopherol is 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 mass of D-α-tocopherol was 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 "Rubber physical test methods - General procedures for specimen preparation and conditioning".

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

[0079] The tensile properties are tested in accordance with GB / T528-2009.

[0080] The vulcanization conditions are: 150℃*3min.

[0081] Modulus of tensile stress: The performance data of Example 1 and Comparative Examples 1-5 are expressed as indices, with the index value of Comparative Example 1 being set to 100. The lower the index value of Example 1 and Comparative Examples 2-5, the lower the modulus of tensile stress.

[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. The higher the value of Example 1 and Comparative Examples 2-5 relative to 100, the higher the elongation.

[0083] Evaluation of the tensile 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. A higher index indicates a greater increase in performance, which means that the performance after aging is worse.

[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 were compared with the data of the corresponding examples before aging. A higher index indicates a lower performance degradation, which means that the performance after aging is better maintained.

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

[0086] Table 1

[0087]

[0088]

[0089] Compared to Comparative Example 1, Example 1, which incorporates a phenolic compound and a pyrazolone heterocyclic compound, exhibits significant improvements in elongation and tensile fatigue performance compared to Comparative Example 1 before aging, while maintaining comparable tensile stress and tensile strength. Therefore, in its initial state, the product prepared in Example 1 exhibits improved flexibility and ductility, capable of withstanding greater deformation without failure. Furthermore, it exhibits superior fatigue resistance under cyclic loading conditions involving repeated stretching and relaxation.

[0090] After aging, Example 1 shows significantly improved performance retention compared to Comparative Example 1. After aging, Example 1 still maintains relatively high mechanical properties, particularly elongation, tensile strength, and tensile fatigue performance, exhibiting improved durability and stability during long-term use, and effectively resisting damage to the rubber network structure caused by environmental factors.

[0091] Pyrazolone heterocyclic compounds are added to the products of Comparative Examples 2 and 3, but no phenolic compounds are added. The tensile stress of Comparative Examples 2 and 3 is reduced compared to that of Comparative Example 1, while the elongation is significantly improved. It shows that under the same tensile conditions, the materials of Comparative Examples 2 and 3 exhibit higher flexibility and ductility, and can withstand greater deformation without breaking. Compared with Comparative Example 1, the tensile fatigue performance shows obvious advantages, showing better fatigue resistance. Comparative Examples 2 and 3 have significantly improved performance retention after aging compared to Comparative Example 1; after a certain period of aging treatment, the materials of Comparative Examples 2 and 3 can still maintain high mechanical properties, showing 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 by increasing the amount of the pyrazolone heterocyclic compound added. The retention of various properties after aging was also improved. However, this adjustment had a certain negative impact on the tensile strength of the material. Specifically, as the amount of the pyrazolone heterocyclic compound added increased, its effect on the tensile stress became increasingly significant, and the improvement in elongation was also more pronounced.

[0093] Comparative Examples 4 and 5 contain phenolic compounds but no pyrazolone heterocyclic compounds. Before aging, the elongation of Comparative Examples 4 and 5 decreased slightly compared to Comparative Example 1, but other properties were comparable to those of Comparative Example 1. This indicates that despite a slight decrease in elongation in the initial state, overall performance was not significantly affected, remaining at a level similar to that of the comparative example. After aging, the performance retention of Comparative Examples 4 and 5 was significantly improved compared to Comparative Example 1. After aging, Comparative Examples 4 and 5 were able to better maintain their mechanical properties, demonstrating superior durability and stability.

[0094] Compared to Comparative Examples 2 and 3, Example 1 achieved significant improvements in modulus tensile stress 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 performance, and retention of various properties after aging treatment, achieving significant improvements. Furthermore, compared to Comparative Examples 4 and 5, Example 1 also achieved significant improvements in elongation and tensile fatigue performance, compensating for the deficiencies of Comparative Examples 4 and 5 in these aspects.

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

[0096] Comparative Examples 2 and 3, which did not contain a phenolic compound, initially exhibited better elongation than Example 1, with significantly lower modulus of tensile stress. However, after aging, Example 1 exhibited superior durability and stability, while the performance of Comparative Examples 2 and 3 declined.

[0097] Comparative Examples 4 and 5 did not add the pyrazolone heterocyclic compound, and their elongation and fatigue properties were lower than those of Example 1. Similarly, after a certain period of aging treatment, the durability and stability of Example 1 were significantly better than those of Comparative Examples 4 and 5.

[0098] Overall, pyrazolone heterocyclic compounds significantly improve the flexibility and ductility of composite materials, but have a greater impact on modulus of tensile stress. The addition of phenolic compounds, on the other hand, does not negatively impact modulus of tensile stress; instead, it effectively offsets the negative impact of pyrazolone heterocyclic compounds on modulus of tensile stress, while also significantly improving durability and stability after aging. When pyrazolone heterocyclic compounds and phenolic compounds are used together in the same formulation, they exhibit a synergistic effect, effectively compensating for the deficiencies of either addition alone, thereby comprehensively enhancing 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 has the ability to optimize comprehensive performance. Through synergistic action, a balance among tensile stress, elongation, and tensile fatigue performance is achieved, which significantly improves the performance retention ability of the rubber composite material after aging, providing an effective solution for the high performance of the rubber composite material.

[0100] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A tire sidewall rubber composition, characterized in that: The invention comprises a pyrazolone heterocyclic compound and a phenolic compound, wherein the pyrazolone heterocyclic compound is 1-phenyl-3-methyl-5-pyrazolone; and the phenolic compound is D-α-tocopherol.

2. The tire sidewall rubber composition according to claim 1, wherein The invention is composed of the following raw materials in parts by mass: 10-100 parts by mass of natural rubber, 10-100 parts by mass of butadiene rubber, 30-80 parts by mass of carbon black, 1-15 parts by mass of zinc oxide, 3-15 parts by mass of rubber oil, 1-5 parts by mass of fatty acid compound, 1-4 parts by mass of protective wax, 0.5-4 parts by mass of antioxidant, 1-8 parts by mass of sulfur powder, 0.5-3 parts by mass of accelerator, 0.05-0.5 parts by mass of anti-scorch agent, 0.3-3 parts by mass of pyrazolone heterocyclic compound and 0.5-5 parts by mass of phenolic compound.

3. The tire sidewall rubber composition according to claim 2, characterized in that: The pyrazolone heterocyclic compound is 0.5-2 parts by mass, and the phenol compound is 1-4 parts by mass.

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

5. The tire sidewall rubber composition according to claim 1, wherein The fatty acid compound is stearic acid.

6. The tire sidewall rubber composition according to claim 2, wherein: The antioxidant is 6PPD; the anti-scorch agent is CTP.

7. The tire sidewall rubber composition according to claim 2, wherein: The carbon black is at least one of N330 and N375.

8. The tire sidewall rubber composition according to claim 2, wherein The accelerator is at least one of accelerator NS, accelerator CZ, accelerator DZ, and accelerator DM.

9. A method for preparing a tire sidewall rubber composition, characterized in that: The following steps are involved: (1) Masterbatch M1: natural rubber, butadiene rubber, 3 / 4 carbon black, zinc oxide, stearic acid, protective wax, and antioxidant are added to an internal mixer and mixed, and then rubber oil is added and mixed to obtain masterbatch M1; (2) Second stage masterbatch M2: Add the first stage masterbatch M1 into an internal mixer, then add the remaining carbon black and pyrazolone heterocyclic compound in the formula and mix, and finally add the phenolic compound and mix and discharge to obtain the first stage masterbatch M2; (3) Final rubber mixing: Add the second-stage masterbatch M2, sulfur powder, accelerator, and anti-scorching agent CTP into the internal mixer for mixing, rubber discharge, and sheeting for the next step of tire tread production.

10. Use of the tire sidewall rubber composition according to any one of claims 1 to 8 or the tire sidewall rubber composition prepared according to claim 9 in tire manufacturing.

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