Environment-friendly sidewall rubber using bio-based rubber oil and preparation method thereof

Abstract

The invention relates to environment-friendly sidewall rubber using bio-based rubber oil and a preparation method of the environment-friendly sidewall rubber. The environment-friendly sidewall rubber comprises the following components in parts by weight: 85-135 parts of a raw rubber system, 45-70 parts of a reinforcing system, 2.5-8 parts of a vulcanizing activator, 2.5-9 parts of an anti-aging agent, 3-8 parts of tackifying resin, 3-10 parts of bio-based oil, 0.5-2 parts of an accelerant, 1-4 parts of a vulcanizing agent and 0.1-0.5 part of a scorch retarder. Compared with the prior art, the invention has the advantages of tear resistance, aging resistance and low pollution.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry and rubber processing, and relates to an environmentally friendly sidewall rubber using bio-based rubber oil and a preparation method thereof. Background Art

[0002] With economic development and population growth, the problem of energy and raw material supply shortages has become increasingly prominent. Fossil resources are non-renewable energy sources and are accompanied by serious environmental pollution. Therefore, the development of renewable and sustainable energy resources is urgent. Biomass energy is an important force in the international energy low-carbon transformation and is the only effective resource that can provide sustainable energy similar to fossil fuels. There are currently some studies on bio-based plastics, bio-based rubbers, and bio-based material additives to solve the problems of fossil energy shortages and environmental pollution. Bio-based material-rubber compatibilizer is a "zero-carbon" or "negative-carbon" material obtained from biomass as raw material through biological manufacturing or chemical processing. Among them, biomass refers to various organisms formed through photosynthesis, including materials derived from all living organisms such as animals, plants and microorganisms.

[0003] Rubber oil is a crucial compatibilizer and additive in rubber extension and processing, and a key raw material in the synthetic rubber and rubber products industries. Rubber oil can be categorized by hydrocarbon composition into three types: paraffinic, cycloalkyl, and aromatic. Paraffinic rubber oils offer excellent oxidation resistance and low aromatic content, but suffer from relatively poor compatibility, migration resistance, and low-temperature resistance. Cycloalkyl rubber oils offer excellent fluidity and are non-toxic, but are more suitable for light-colored products. Aromatic rubber oils offer the best compatibility and viscosity, but are highly toxic and pose environmental risks. Consequently, there are calls to reduce the aromatic content in rubber oils. With increasing environmental awareness and increasingly stringent regulations governing the use of rubber oil, low-toxic and non-toxic rubber oils are becoming a key development direction for the tire industry worldwide. In tire manufacturing, green and environmentally friendly rubber processing oils are essential to improve the processing and physical properties of rubber compounds. Therefore, developing environmentally friendly rubber oils will contribute to the production of high-performance, green tires, keeping pace with the times.

[0004] Patent CN109206676A discloses an aging-resistant, tear-resistant, and crack-growth-resistant rubber composition for all-steel sidewalls, as well as its preparation method and application. The rubber composition comprises the following raw materials in parts by weight: 40-60 parts natural rubber, 40-60 parts butadiene rubber, 40-55 parts carbon black, 3-5 parts zinc oxide, 1-3 parts stearic acid, 1-2 parts protective wax, 2-5 parts antioxidant, 1-4 parts tackifying resin, 1-3 parts process oil, 0.5-1 part sulfur, 1-3 parts accelerator, 1-2 parts leveling agent, and 0.1-0.2 parts scorch retarder (CTP); wherein the process oil is environmentally friendly aromatic oil (TDAE). Although this patent uses environmentally friendly aromatic oil (TDAE), it requires higher-structured N220 carbon black for reinforcement and performance improvement, as well as the addition of a leveling agent to promote carbon black dispersion.

[0005] Patent CN111393726A discloses an environmentally friendly all-steel tire sidewall rubber and a preparation method thereof. The environmentally friendly all-steel tire sidewall rubber comprises the following components, each component being calculated by weight: 40-65 parts of natural rubber, 35-60 parts of butadiene rubber, 40-60 parts of carbon black, 2-5 parts of tackifying resin, 2-8 parts of extender oil, 0.5-5 parts of zinc oxide, 0.1-3 parts of stearic acid, 1-3.5 parts of antioxidant 4020, 0.5-3 parts of antioxidant FR, 0.5-2 parts of type B microcrystalline wax, 0.5-2 parts of accelerator, and 1-3 parts of sulfur powder; wherein the extender oil is at least one of environmentally friendly aromatic oil, cyclohexane oil, and soybean oil; and the accelerator is accelerator TBSI. This patent reflects the environmental friendliness of the rubber tire sidewall rubber by adopting environmentally friendly filler oil and using a new accelerator TBSI to replace the traditional accelerator TBBS and scorch retarder CTP; however, the rubber compound obtained by this patent has a shortened scorch time and a prolonged vulcanization time, which is not conducive to the production and processing of the rubber compound. In addition, the main components do not use recycled materials, and the recycling of resources is insufficient. Summary of the Invention

[0006] The purpose of the present invention is to overcome at least one of the defects of the above-mentioned prior art and to provide an environmentally friendly sidewall rubber using bio-based rubber oil and a preparation method thereof. The present invention has the advantages of tear resistance, aging resistance and low pollution.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide an environmentally friendly sidewall rubber using bio-based rubber oil, the environmentally friendly sidewall rubber comprising the following components in parts by weight:

[0009] The composition comprises 85 to 135 parts of a raw rubber system, 45 to 70 parts of a reinforcing system, 2.5 to 8 parts of a vulcanizing activator, 2.5 to 9 parts of an antioxidant, 3 to 8 parts of a tackifying resin, 3 to 10 parts of a bio-based oil (bio-based rubber oil), 0.5 to 2 parts of an accelerator, 1 to 4 parts of a vulcanizing agent, and 0.1 to 0.5 parts of a scorch retarder. The bio-based oil has the effects of plasticizing and softening.

[0010] Furthermore, the raw rubber system comprises the following components in parts by weight:

[0011] 45-60 parts of natural rubber, 35-55 parts of synthetic rubber and 5-20 parts of recycled rubber;

[0012] The synthetic rubber is butadiene rubber, which is selected from one or more of butadiene rubber BR9000, BR9102, BR60, and CB22.

[0013] As a preferred technical solution, the amount of natural rubber used is slightly higher than that of synthetic rubber.

[0014] Furthermore, the reinforcement system comprises the following components in parts by weight:

[0015] 35-50 parts of furnace carbon black and 10-20 parts of regenerated carbon black;

[0016] The furnace carbon black is selected from one or more of carbon black N330, N375, and N660, and the regenerated carbon black is selected from one or more of thermal cracking carbon black EN660 and FN660.

[0017] Furthermore, the vulcanization activator includes the following components in parts by weight:

[0018] 2-5 parts of zinc oxide and 0.5-3 parts of stearic acid;

[0019] For better dispersibility and vulcanization performance, the zinc oxide includes the following components in parts by weight:

[0020] 1-2.5 parts of ordinary zinc oxide and 1-2.5 parts of activated zinc oxide;

[0021] The specific surface area of the ordinary zinc oxide is 2 to 10 m 2 / g, the specific surface area of the active zinc oxide is 40 to 60m 2 / g.

[0022] As a preferred technical solution, the specific surface area of the ordinary zinc oxide is 4m 2 / g or 8m 2 / g.

[0023] Furthermore, the antioxidant includes the following components in parts by weight:

[0024] 1 to 4 parts of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (antioxidant 4020), 0.5 to 3 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (antioxidant RD) and 1 to 2 parts of protective wax.

[0025] Furthermore, the tackifying resin is selected from one or more of petroleum resin and phenolic resin, the petroleum resin has 4 to 12 carbon atoms, and the phenolic resin is selected from one or more of phenolic resin 204, WDH-118, and SL-1410.

[0026] As a preferred technical solution, the petroleum resin has 5 or 9 carbon atoms.

[0027] Furthermore, the accelerator is selected from one or more of N-tert-butyl-2-benzothiazole sulfenamide (accelerator NS), N,N-dicyclohexyl-2-benzothiazole sulfenamide (accelerator DZ), and diphenylguanidine (accelerator D); the vulcanizing agent is selected from one or more of sulfur powder (S8) and insoluble sulfur; the insoluble sulfur is selected from one or more of insoluble sulfur OT20, IS7720, and IS7020; and the scorch retarder is selected from one or more of N-cyclohexylthiophthalimide (scorch retarder CTP), phthalic anhydride, and salicylic acid.

[0028] One of the technical solutions of the present invention is to provide a method for preparing the environmentally friendly sidewall rubber using bio-based rubber oil, the method comprising the following steps:

[0029] S1. In the mixing chamber of an internal mixer, rubber is added, a top bolt is pressed, the top bolt is lifted after holding, carbon black, a vulcanization activator and an antioxidant are added, the top bolt is pressed, the top bolt is lifted after mixing, tackifying resin and bio-based oil are added, the top bolt is pressed, mixing is continued until a certain temperature is reached, and the top bolt is lifted to discharge the rubber to obtain a masterbatch, which is then left for final sulfur mixing;

[0030] S2. Add masterbatch, accelerator, vulcanizer and scorch retarder into the mixing chamber of the internal mixer, pause and then press the top plug, lift the top plug after mixing, pause and then press the top plug again, mix to a certain temperature and then lift the top plug to discharge the rubber, thereby obtaining environmentally friendly sidewall rubber using bio-based rubber oil.

[0031] Furthermore, in step S1, the rotor speed of the internal mixer is 50-60 rpm, the mixing pressure is 0.45-0.65 MPa, the cooling water temperature is 30-40° C., and the rotor temperature is 30-40° C.

[0032] The holding time of the rubber is 25 to 30 seconds, the mixing time of the carbon black, the vulcanization activator and the antioxidant is 25 to 40 seconds, the mixing temperature of the tackifying resin and the bio-based oil is 160 to 170° C., and the storage time of the masterbatch is 4 to 24 hours.

[0033] Furthermore, in step S2, the rotor speed of the internal mixer is 15-35 rpm, the mixing pressure is 0.3-0.6 MPa, the cooling water temperature is 30-40° C., and the rotor temperature is 30-40° C.

[0034] The first residence time is 2 to 10 seconds, the first mixing time is 25 to 35 seconds, the second residence time is 2 to 10 seconds, and the second mixing temperature is 95 to 110°C.

[0035] One of the technical solutions of the present invention is to provide an application of the environmentally friendly sidewall rubber using bio-based rubber oil in a full steel radial tire.

[0036] As a preferred technical solution, the environmentally friendly sidewall rubber is applied to the sidewall formulation of an all-steel radial tire.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The high-performance environmentally friendly sidewall rubber involved in the present invention uses renewable bio-based oil in the component to replace high aromatic oil in equal amounts, thereby retaining the good processing performance and physical properties of the rubber compound, greatly reducing the amount of aromatics used, strengthening the reuse of waste biomass, and reducing environmental pollution and energy waste during the use of the tire. It is beneficial to the manufacture of green tires, contributes to the improvement of environmental, social and corporate governance (ESG), and opens up a larger sales market;

[0039] (2) The high-performance environmentally friendly sidewall rubber involved in the present invention uses recycled rubber to replace part of natural rubber and butadiene rubber, and uses thermal cracking carbon black to replace part of furnace carbon black, thereby realizing the reuse of resources such as rubber and carbon black, reducing resource waste, and saving material costs, which is in line with the industrial policy of circular economy and low-carbon environmental protection;

[0040] (3) The high-performance environmentally friendly sidewall rubber involved in the present invention has better compatibility between the bio-based oil and the rubber in the components. The bio-based oil enters between the rubber molecular chains, which increases the molecular distance, reduces the intermolecular force, enhances the chain segment activity, and enhances the rubber plasticity, thereby promoting the uniform dispersion of various fillers in the rubber molecular chains, reducing the compression temperature rise of the sidewall rubber, and improving the tensile strength, elongation, tear strength and aging resistance of the vulcanized rubber to a certain extent;

[0041] (4) The high-performance environmentally friendly sidewall rubber involved in the present invention uses low-structure furnace carbon black and recycled carbon black as its components, which have a good reinforcing effect. After adding bio-based oil, no dispersant is needed, and the rubber still has low heat generation and high tearing performance. DETAILED DESCRIPTION

[0042] The present invention is described in detail below with reference to specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0043] Unless otherwise specified, the equipment used in the following examples are all conventional equipment in the art; the reagents used are all commercially available products or prepared by conventional methods in the art unless otherwise specified. Anything not described in detail in the following examples can be achieved by conventional experimental means in the art.

[0044] Example:

[0045] An environmentally friendly sidewall compound using bio-based rubber oil is used in the sidewall formulation of all-steel radial tires. The specific formulation composition is shown in Table 1.

[0046] In the examples and comparative examples, natural rubber was purchased from Xishuangbanna Nanbo Co., Ltd., model TSR20; butadiene rubber BR9000 was purchased from PetroChina Sichuan Petrochemical Co., Ltd.; high-strength recycled rubber was purchased from Nantong Huili Rubber Co., Ltd., which was derived from waste tire rubber powder after desulfurization and refining; carbon black N330 was purchased from Jiangxi Black Cat Carbon Black Co., Ltd.; thermal cracking carbon black FN660 was purchased from Changshu Kairun New Materials Technology Co., Ltd., which was derived from waste tire cracking; 4m 2 / g ordinary zinc oxide was purchased from Chongqing Judu Zinc Industry Co., Ltd., with a zinc oxide content of ≥99.50%; 45m 2 / g active zinc oxide was purchased from Fuyang Hongyuan Rubber Technology Co., Ltd., with a zinc oxide content of ≥49.00%; stearic acid was purchased from Nantong Kaita Chemical Technology Co., Ltd.; antioxidant 4020 (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine) was purchased from Kemai Chemical Co., Ltd.; antioxidant RD (2,2,4-trimethyl-1,2-dihydroquinoline polymer) was purchased from Kemai Chemical Co., Ltd.; protective wax was purchased from Shandong Yanggu Huatai Chemical Co., Ltd.; C-5 petroleum resin was purchased from Changzhou Yongjiang Petroleum Resin Co., Ltd. of Chongqing; high aromatic oil was purchased from Chongqing Hongrun Petrochemical Co., Ltd.; bio-based oil (bio-based rubber oil) was purchased from Shanghai Ligao Environmental Protection Materials Co., Ltd., model LGH, extracted from waste fir and pine saw sugar; accelerator NS (N-tert-butyl-2-benzothiazole sulfenamide) was purchased from Kemai Chemical Co., Ltd.; sulfur powder was purchased from Jiangxi Jianbo Rubber Additive Co., Ltd.; scorch retarder CTP (N-cyclohexylthiophthalimide) was purchased from Shandong Yanggu Huatai Chemical Co., Ltd.

[0047] Table 1 Composition of the Examples and Comparative Examples

[0048]

[0049] The method for preparing the environmentally friendly sidewall rubber using bio-based rubber oil comprises the following specific steps:

[0050] S1, masterbatch mixing, set the rotor speed of the internal mixer to 55rpm, the mixing pressure to 0.55MPa, the cooling water temperature to 35℃, the rotor temperature to 35℃, add natural rubber, butadiene rubber BR9000 and high-strength recycled rubber into the mixing chamber of the internal mixer, press the top bolt, hold it for 30s and then lift the top bolt, add carbon black N330, thermal cracking carbon black FN660, 4m 2 / g ordinary zinc oxide, activated zinc oxide, stearic acid, antioxidant 4020, antioxidant RD and protective wax, press the top plug, mix for 29 seconds and then remove the top plug, add C-5 petroleum resin and bio-based oil, press the top plug, mix to 165℃ and then remove the top plug to obtain masterbatch, and then add sulfur and final refining after the masterbatch is parked for 12 hours;

[0051] S2, final mixing, set the rotor speed of the internal mixer to 30rpm, the mixing pressure to 0.45MPa, the cooling water temperature to 35℃, and the rotor temperature to 35℃, add masterbatch, accelerator NS, sulfur powder and scorch retarder CTP into the mixing chamber of the internal mixer, stay for 6s and then press the top plug, mix for 30s and then lift the top plug, stay for 5s and then press the top plug again, mix to 103℃ and then lift the top plug to discharge the rubber, to obtain the finished rubber, that is, the environmentally friendly sidewall rubber using bio-based rubber oil.

[0052] Comparative Example:

[0053] A sidewall rubber and a preparation method thereof are basically the same as those in the embodiment, except that the bio-based oil is replaced with high aromatic oil. The specific formula composition is shown in Table 1.

[0054] The sidewall rubber and its formulation were subjected to the following tests or experiments, and the test results were then analyzed.

[0055] Test Example 1:

[0056] Chemical analysis tests were performed on the rubber oil, bio-based oil and high aromatic oil used in the examples and comparative examples. The test results are shown in Table 2.

[0057] Table 2 Chemical analysis results of rubber oil in Examples and Comparative Examples

[0058]

[0059] Note: There is no clear standard for the PAHs (polycyclic aromatic hydrocarbons) content in rubber oil. The above standards are based on the UK's PAHs content requirements for oil products (BS / EN 16143:1), which stipulate that the BaP (benzo[a]pyrene) content is less than 1 mg / kg and the contents of 8 PAHs are less than 10 mg / kg. Germany's AfPs GS2019:01PAK stipulates the content of 15 PAHs, which is less than 50 mg / kg.

[0060] As shown in Table 2, it can be seen that the volatile matter and ash contents of the bio-based oil in the examples and the high aromatic oil in the comparative examples are relatively low, which indicates that the purity of the oils is relatively high.

[0061] The flash point temperature of bio-based oil is close to that of high aromatic oil, indicating that bio-based oil still has good operating safety;

[0062] Bio-based oils have lower viscosity than high-aromatic oils, which can increase the extrusion speed of the sidewall rubber;

[0063] The aromatic content of bio-based oil is very low, much lower than that of high-aromatic oil, which helps reduce environmental pollution.

[0064] Test Example 2:

[0065] The above sidewall rubber was subjected to physical property tests, and the test results are shown in Table 3.

[0066] Table 3 Physical detection performance of the embodiments and comparative examples

[0067]

[0068] As shown in Table 3, it can be seen that the hardness, Mooney viscosity, scorch time, and vulcanization time of the rubber compound of the embodiment formula are close to those of the rubber compound of the comparative example formula, which indicates that the replacement of high aromatic oil with bio-based oil has no negative impact on the processing performance and operational safety of the rubber compound, and does not affect production efficiency.

[0069] The difference between the maximum torque and the minimum torque of the vulcanized rubber before and after aging (F H -F L ), 300% modulus of tensile stress, tensile strength, tearing property and elongation at break are substantially superior to those of the vulcanized rubber in the comparative example. This is because the internal lubrication effect of the bio-based oil in the example improves the movement of the molecular chains, thereby promoting the uniform dispersion of various fillers, enhancing the reinforcing effect of various fillers, and improving the physical properties of the rubber compound;

[0070] The softening effect of the bio-based oil in the embodiment reduces the compression fatigue temperature rise of the rubber compound by 2.9° C., which helps to increase the life of the tire.

[0071] In summary, the present invention uses bio-based oil to replace high-aromatic oil, which not only reduces the aromatic content in rubber products and reduces the emission of toxic substances, but also improves the stress-strain properties and aging resistance of the rubber compound, which helps to produce green and environmentally friendly tires.

[0072] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. An environmentally friendly sidewall rubber using bio-based rubber oil, characterized in that: The environmentally friendly sidewall rubber comprises the following components in parts by weight: 85-135 parts of raw rubber system, 45-70 parts of reinforcing system, 2.5-8 parts of vulcanization activator, 2.5-9 parts of antioxidant, 3-8 parts of tackifying resin, 3-10 parts of bio-based oil, 0.5-2 parts of accelerator, 1-4 parts of vulcanizing agent and 0.1-0.5 parts of scorch retarder.

2. The environmentally friendly sidewall rubber using bio-based rubber oil according to claim 1, characterized in that: The raw rubber system comprises the following components in parts by weight: 45-60 parts of natural rubber, 35-55 parts of synthetic rubber and 5-20 parts of recycled rubber; The synthetic rubber is butadiene rubber, which is selected from one or more of butadiene rubber BR9000, BR9102, BR60, and CB22.

3. The environmentally friendly sidewall rubber using bio-based rubber oil according to claim 1, characterized in that: The reinforcement system includes the following components in parts by weight: 35-50 parts of furnace carbon black and 10-20 parts of regenerated carbon black; The furnace carbon black is selected from one or more of carbon black N330, N375, and N660, and the regenerated carbon black is selected from one or more of thermal cracking carbon black EN660 and FN660.

4. The environmentally friendly sidewall rubber using bio-based rubber oil according to claim 1, characterized in that: The vulcanization activator comprises the following components in parts by weight: 2-5 parts of zinc oxide and 0.5-3 parts of stearic acid; Described zinc oxide comprises the following components in parts by weight: 1-2.5 parts of ordinary zinc oxide and 1-2.5 parts of activated zinc oxide; The specific surface area of the ordinary zinc oxide is 2 to 10 m 2 / g, the specific surface area of the active zinc oxide is 40 to 60m 2 / g.

5. The environmentally friendly sidewall rubber using bio-based rubber oil according to claim 1, characterized in that: The antioxidant comprises the following components in parts by weight: 1 to 4 parts of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, 0.5 to 3 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer and 1 to 2 parts of protective wax.

6. The environmentally friendly sidewall rubber using bio-based rubber oil according to claim 1, characterized in that: The tackifying resin is selected from one or more of petroleum resin and phenolic resin. The petroleum resin has 4 to 12 carbon atoms. The phenolic resin is selected from one or more of phenolic resin 204, WDH-118 and SL-1410.

7. The environmentally friendly sidewall rubber using bio-based rubber oil according to claim 1, characterized in that: The accelerator is selected from one or more of N-tert-butyl-2-benzothiazolesulfenamide, N,N-dicyclohexyl-2-benzothiazolesulfenamide, and diphenylguanidine; the vulcanizing agent is selected from one or more of sulfur powder and insoluble sulfur; the insoluble sulfur is selected from one or more of insoluble sulfur OT20, IS7720, and IS7020; and the scorch retarder is selected from one or more of N-cyclohexylthiophthalimide, phthalic anhydride, and salicylic acid.

8. A method for preparing an environmentally friendly sidewall rubber using bio-based rubber oil according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1. In the mixing chamber of an internal mixer, rubber is added, a top bolt is pressed, the top bolt is lifted after holding, carbon black, a vulcanization activator and an antioxidant are added, the top bolt is pressed, the top bolt is lifted after mixing, tackifying resin and bio-based oil are added, the top bolt is pressed, mixing is continued until a certain temperature is reached, and the top bolt is lifted to discharge the rubber to obtain a masterbatch, which is then stored; S2. Add masterbatch, accelerator, vulcanizer and scorch retarder into the mixing chamber of the internal mixer, pause and then press the top plug, lift the top plug after mixing, pause and then press the top plug again, mix to a certain temperature and then lift the top plug to discharge the rubber, thereby obtaining environmentally friendly sidewall rubber using bio-based rubber oil.

9. The method for preparing an environmentally friendly sidewall rubber using bio-based rubber oil according to claim 8, characterized in that: In step S1, the rotor speed of the internal mixer is 50-60 rpm, the mixing pressure is 0.45-0.65 MPa, the cooling water temperature is 30-40°C, and the rotor temperature is 30-40°C. The holding time of the rubber is 25 to 30 seconds, the mixing time of the carbon black, the vulcanization activator and the antioxidant is 25 to 40 seconds, the mixing temperature of the tackifying resin and the bio-based oil is 160 to 170° C., and the storage time of the masterbatch is 4 to 24 hours.

10. The method for preparing an environmentally friendly sidewall rubber using bio-based rubber oil according to claim 8, characterized in that: In step S2, the rotor speed of the internal mixer is 15-35 rpm, the mixing pressure is 0.3-0.6 MPa, the cooling water temperature is 30-40° C., and the rotor temperature is 30-40° C. The first residence time is 2 to 10 seconds, the first mixing time is 25 to 35 seconds, the second residence time is 2 to 10 seconds, and the second mixing temperature is 95 to 110°C.

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