Bio-based sustainable tire tread rubber composition and preparation method thereof

Abstract

The present invention provides a bio-based sustainable tire tread rubber composition and a preparation method thereof, and relates to the field of rubber tire manufacturing, the bio-based sustainable tire tread rubber composition is prepared from the following raw materials by weight: 10-50 phr of natural rubber, 30-90 phr of solution polymerized styrene butadiene rubber, 0-15 phr of eucommia ulmoides rubber, 30-60 phr of carbon black, 5-20 phr of a lignin reinforcing filler, 0-3 phr of a lignin-based anti-aging agent, and 1-6 phr of a conventional anti-aging agent, the formula comprises the following components in percentage by weight: 3-7 phr of zinc oxide, 0.2-2 phr of stearic acid, 1-3 phr of an accelerant and 1-4 phr of a vulcanizing agent. According to the prepared rubber material, the lignin reinforcing filler and the lignin-based anti-aging agent are used for replacing traditional carbon black filler and petroleum-based anti-aging agent products, the use amount of petroleum-based chemicals in a formula system is reduced, environmental pollution is reduced, and carbon emission is reduced; the adopted preparation process can effectively promote the dispersion of the lignin filler; in the prepared rubber composition, the eucommia ulmoides rubber is applied, so that the mechanical property and the fatigue property of vulcanized rubber can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of rubber tire manufacturing, in particular to a bio-based sustainable tire tread rubber composition and a preparation method thereof. Background Art

[0002] At present, the tire industry is vigorously developing bio-based and sustainable materials, seeking to replace traditional petrochemical materials in tires. So far, the most commonly used rubbers in the tire manufacturing process are natural rubber, styrene-butadiene rubber and butadiene rubber; the commonly used reinforcing materials are mainly carbon black, white carbon black and calcium carbonate; the commonly used operating oils are mainly aromatic oils; and the commonly used antioxidants are mainly RD and 6PPD. Therefore, except for natural rubber, the raw materials used in the tire industry are basically derived from petrochemical products. It is essential to develop a bio-based and sustainable tire rubber compound.

[0003] Lignin is the second largest biomass resource in the plant kingdom after cellulose. It is a typical natural organic polymer compound. Lignin is a type of substance composed of polymerized aromatic alcohols. It exists in wood tissues. Its main function is to harden the cell wall by forming an interwoven network. It is mainly located between cellulose fibers and plays a compressive role. Moreover, lignin molecules contain different active functional groups such as conjugated double bonds, aromatic groups, phenolic hydroxyl groups, pure hydroxyl groups, carbonyl groups and carboxyl groups. It also has the advantages of being renewable, degradable, non-toxic and having large reserves, so it can be used in the rubber industry.

[0004] Sustainable tires prepared in the prior art mostly use a small amount of lignin as a filling material, or use a large amount of natural rubber to increase the proportion of bio-based materials in the tire tread rubber. The bio-based tires prepared by this method have limitations in their formulation, and the wear resistance and fatigue performance of the tires are poor. Summary of the invention

[0005] The present invention provides a bio-based sustainable tire tread rubber composition and a preparation method thereof, so as to solve the problem that the bio-based tire prepared by the current method mentioned above has formulation limitations and poor wear resistance and fatigue performance of the tire.

[0006] To solve the above technical problems, the present invention discloses a bio-based sustainable tire tread rubber composition and a preparation method thereof, which comprises the following raw materials, by weight: 10-50 phr of natural rubber, 30-90 phr of solution-polymerized styrene-butadiene rubber, 0-15 phr of eucommia rubber, 30-60 phr of carbon black, 5-20 phr of lignin reinforcing filler, 0-3 phr of lignin-based antioxidant, 1-6 phr of conventional antioxidant, 3-7 phr of zinc oxide, 0.2-2 phr of stearic acid, 1-3 phr of accelerator, and 1-4 phr of vulcanizing agent.

[0007] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the solution polymerized styrene butadiene rubber is a dual-end modified solution polymerized styrene butadiene rubber, the styrene content in the solution polymerized styrene butadiene rubber is less than 6%, and the glass transition temperature is less than -45°C.

[0008] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the eucommia rubber is trans-poly 1,4-isoprene, and the eucommia rubber is prepared by extracting eucommia seed shells through the steps of washing, crushing, solvent dissolution, standing and the like.

[0009] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the lignin-based antioxidant is a masterbatch product prepared by loading lignin in styrene-butadiene rubber, and the effective content of the lignin antioxidant is 75%.

[0010] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the lignin in the lignin antioxidant is derived from eucalyptus trees and comprises the following groups:

[0011] The content of group S in the group is greater than or equal to 40%.

[0012] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the carbon black is medium-super wear-resistant carbon black with a particle size of 20-25 nm.

[0013] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the lignin reinforcing filler is lignin sulfonate, and its particle size is within 10 μm.

[0014] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the conventional antioxidant is a mixture of antioxidants RD and 6PPD.

[0015] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the preparation method of the environmentally friendly rubber composition reinforced with biomass fillers comprises the following steps: Step 1: Heat the eucommia rubber in an oven at 60-90°C to soften the raw rubber so that it can be used in the next step of mixing; Step 2: Add natural rubber and the Eucommia rubber described in step 1 into an internal mixer and plasticize for 60-100 seconds, add solution-polymerized styrene-butadiene rubber and plasticize for 30 seconds, then add lignin reinforcing filler and perform preliminary mixing to obtain a lignin reinforced filler masterbatch; Step 3: Add the rubber mix prepared in step 2 and 2 / 3 of carbon black into an internal mixer, mix for 1 minute, raise the top bolt and add the remaining 1 / 3 of carbon black, add zinc oxide, stearic acid, lignin-based antioxidant and conventional antioxidant, mix and heat to 150-160°C to discharge the rubber, and obtain a two-stage rubber mix; during the mixing process, the speed of the internal mixer is 40-80 rpm and the pressure is 15-18 MPa; Step 4: Add the second-stage mixed rubber, accelerator and vulcanizer into the internal mixer, rotate at 30-50 rpm, set the internal mixer pressure at 14-17 MPa, raise the top bolt in 30-60 seconds, discharge the rubber, and obtain the final mixed rubber.

[0016] Preferably, in the above-mentioned bio-based sustainable tire tread rubber composition and preparation method thereof, the speed of the internal mixer in step 2 is 50-90 rpm, the pressure of the internal mixer is 15-19 MPa, the mixing time of the internal mixer is 2-3.5 min, and the discharge temperature of the internal mixer is 120-145°C.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the rubber material prepared by the present invention uses lignin reinforcing fillers and lignin-based antioxidants to replace traditional carbon black fillers and petroleum-based antioxidant products, reducing the amount of petroleum-based chemicals in the formulation system, which is beneficial to reducing environmental pollution and carbon emissions, and the preparation process adopted can effectively promote the dispersion of lignin fillers; in the rubber composition prepared by the present invention, eucommia rubber is used, which can effectively improve the mechanical properties and fatigue properties of the vulcanized rubber. In the present invention, lignin is not only used as a filler, but also a lignin masterbatch product with better dispersibility is used as an antioxidant. At the same time, in order to improve the wear resistance of the rubber material, eucommia rubber is introduced to replace part of the solution-polymerized styrene-butadiene rubber. The results show that the bio-based sustainable tire tread rubber material provided by the present invention has low heat generation, good wear resistance, and has the same aging resistance as traditional tires. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The RPA-Payne effect curves of the rubber mixes of Example 1 and Comparative Example 1 of the present invention; Figure 2 The RPA-Payne effect curves of the rubber mixes of Examples 2-3 and Comparative Example 2 of the present invention are shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0023] The present application provides a bio-based sustainable tire tread rubber composition and a preparation method thereof, which comprises the following raw materials, by weight: 10-50 phr of natural rubber, 30-90 phr of solution-polymerized styrene-butadiene rubber, 0-15 phr of eucommia rubber, 30-60 phr of carbon black, 5-20 phr of lignin reinforcing filler, 0-3 phr of lignin-based antioxidant, 1-6 phr of conventional antioxidant, 3-7 phr of zinc oxide, 0.2-2 phr of stearic acid, 1-3 phr of accelerator, and 1-4 phr of vulcanizing agent.

[0024] In order to further optimize the above technical solution, the solution polymerized styrene butadiene rubber is a double-end modified solution polymerized styrene butadiene rubber, the styrene content in the solution polymerized styrene butadiene rubber is less than 6%, and the glass transition temperature is less than -45°C.

[0025] In order to further optimize the above technical solution, the eucommia rubber is trans-poly 1,4-isoprene, and the eucommia rubber is extracted and prepared from the eucommia seed shell through the steps of water washing, crushing, solvent dissolution, and standing.

[0026] In order to further optimize the above technical solution, the lignin-based antioxidant is a masterbatch product prepared by loading lignin in styrene-butadiene rubber, and the effective content of the lignin antioxidant is 75%.

[0027] To further optimize the above technical solution, the lignin in the lignin antioxidant is derived from eucalyptus trees and contains the following groups:

[0028] The content of group S in the group is greater than or equal to 40%.

[0029] In order to further optimize the above technical solution, the carbon black is medium-super wear-resistant carbon black with a particle size of 20-25nm.

[0030] In order to further optimize the above technical solution, the lignin reinforcing filler is lignin sulfonate, and its particle size is within 10 μm.

[0031] In order to further optimize the above technical solution, the conventional antioxidant is a mixture of antioxidant RD and 6PPD.

[0032] To further optimize the above technical solution, the preparation method of the environmentally friendly rubber composition reinforced with biomass filler comprises the following steps: Step 1: Heat the eucommia rubber in an oven at 60-90°C to soften the raw rubber so that it can be used in the next step of mixing; Step 2: Add natural rubber and the Eucommia rubber described in step 1 into an internal mixer and plasticize for 60-100 seconds, add solution-polymerized styrene-butadiene rubber and plasticize for 30 seconds, then add lignin reinforcing filler and perform preliminary mixing to obtain a lignin reinforced filler masterbatch; Step 3: Add the rubber mix prepared in step 2 and 2 / 3 of carbon black into an internal mixer, mix for 1 minute, raise the top bolt and add the remaining 1 / 3 of carbon black, add zinc oxide, stearic acid, lignin-based antioxidant and conventional antioxidant, mix and heat to 150-160°C to discharge the rubber, and obtain a two-stage rubber mix; during the mixing process, the speed of the internal mixer is 40-80 rpm and the pressure is 15-18 MPa; Step 4: Add the second-stage mixed rubber, accelerator and vulcanizer into the internal mixer, rotate at 30-50 rpm, set the internal mixer pressure at 14-17 MPa, raise the top bolt in 30-60 seconds, discharge the rubber, and obtain the final mixed rubber.

[0033] To further optimize the above technical solution, in step 2, the speed of the internal mixer is 50-90 rpm, the pressure of the internal mixer is 15-19 MPa, the mixing time of the internal mixer is 2-3.5 min, and the discharge temperature of the internal mixer is 120-145°C.

[0034] The present invention provides the following embodiments: Example 1 Prepare the raw materials of natural rubber 30phr, solution polymerized styrene butadiene rubber 60phr, eucommia rubber 10phr, carbon black N234 30phr, lignin reinforcing agent 10phr, lignin-based antioxidant 1phr, antioxidant 3phr, zinc oxide 5phr, stearic acid 1phr, sulfur 2.7phr, and accelerator 1.5phr. Heat the eucommia rubber in an oven at 70°C to soften the raw rubber; add natural rubber and the above-mentioned eucommia rubber to an internal mixer and plasticize for 80s, add solution polymerized styrene butadiene rubber and plasticize for 30s, then add lignin reinforcing filler for preliminary mixing to obtain lignin reinforced filler masterbatch; the internal mixer speed is 70 rpm, the internal mixer pressure is 17MP, the internal mixer mixing time is 2.5min, and the internal mixer discharge temperature is 130°C; add the above-prepared mixed Rubber mixing, 2 / 3 carbon black N234, mixing for 1 minute, raising the top bolt to add the remaining 1 / 3 carbon black N234, adding zinc oxide, stearic acid, lignin-based antioxidant and antioxidant, mixing and heating to 155°C to discharge the rubber, and obtain the second-stage mixed rubber; during the mixing process, the speed of the internal mixer is 60 rpm and the pressure is 16MPa; add the second-stage mixed rubber to the internal mixer, add the accelerator and sulfur, the speed is 40 rpm, the pressure of the internal mixer is 15MPa, and the top bolt is raised for 45s to discharge the rubber to obtain the final mixed rubber.

[0035] Comparative Example 1 Prepare the raw materials: 30phr of natural rubber, 70phr of solution-polymerized styrene-butadiene rubber, 48phr of carbon black N234, 4phr of antioxidant, 5phr of zinc oxide, 1phr of stearic acid, 2.7phr of sulfur, and 1.5phr of accelerator. Add natural rubber and solution polymerized styrene-butadiene rubber to an internal mixer and plasticate for 30 seconds for preliminary mixing; the internal mixer speed is 70 rpm, the internal mixer pressure is 17 MPa, the mixing time of the internal mixer is 2.5 min, and the discharge temperature of the internal mixer is 130°C; add the prepared mixed rubber and 2 / 3 carbon black N234 to the internal mixer, mix for 1 minute, raise the top bolt and add the remaining 1 / 3 carbon black N234, add zinc oxide, stearic acid, and antioxidant, mix and heat to 155°C for discharge, and obtain a two-stage mixed rubber; during the mixing process, the internal mixer speed is 60 rpm and the pressure is 16 MPa; add the second-stage mixed rubber to the internal mixer, add an accelerator and sulfur, the speed is 40 rpm, the internal mixer pressure is 15 MPa, the top bolt is raised for 45 seconds, the rubber is discharged, and the final mixed rubber is obtained.

[0036] The raw materials and contents used in Example 1 and Comparative Example 1 are shown in Table 1: Table 1 Raw materials and contents used in Example 1 and Comparative Example 1

[0037] Take the rubber materials made of the materials described in Comparative Example 1 and Example 1 in Table 1 and test them. The results are as follows: Figure 1 As shown in Table 2: Table 2 Test results of comparative example 1 and embodiment 1

[0038] As can be seen from Table 2, compared with Comparative Example 1, the rebound of Example 1 increases by 6 values, the tensile strength, elongation at break and modulus of elongation slightly increase or remain the same, with small fluctuations, and the compression heat generation is reduced by 8.8°C; 60°C tanδ represents the hysteresis heat generation of the rubber compound, and the lower the 60°C tanδ value, the smaller the hysteresis heat generation of the rubber compound. Compared with Comparative Example 1, the hysteresis heat generation of Example 1 is reduced by 25.8%. This shows that the rubber compound prepared by the present invention has excellent low heat generation performance.

[0039] And combined with Figure 1 It can be seen that the ΔG' of the mixed rubber represents the dispersion of the filler. The smaller the ΔG', the better the dispersion of the filler. Compared with the comparative example 1, the ΔG' of Example 1 is smaller, indicating that the rubber prepared by the preparation method of the present invention has better dispersion performance.

[0040] Example 2 Prepare the raw materials: natural rubber 40phr, butadiene rubber 60phr, carbon black N330 37phr, carbon black N660 8phr, biomass reinforcement agent 8phr, environmentally friendly aromatic oil 5phr, zinc oxide 3phr, stearic acid 1phr, octyl phenolic tackifying resin 4phr, antioxidant 6PPD 1.5phr, antioxidant RD 1phr, microcrystalline wax 2phr, accelerator 1phr, sulfur 1.5phr. Add natural rubber and butadiene rubber to the internal mixer and plasticize for 30 seconds, then add the biomass reinforcing agent for preliminary mixing; the internal mixer speed is 90 rpm, the internal mixer pressure is 19 MP, the mixing time of the internal mixer is 3.5 minutes, and the rubber discharge temperature of the internal mixer is 145°C; add the prepared mixed rubber, 2 / 3 carbon black N330 and carbon black N660 to the internal mixer, mix for 1 minute, raise the top bolt and add the remaining 1 / 3 carbon black N330 and carbon black N660, add environmentally friendly aromatic oil, zinc oxide, stearic acid, octyl phenolic tackifying resin, antioxidant 6PPD, antioxidant RD, microcrystalline wax, mix and heat to 150°C to discharge the glue to obtain the second-stage mixed rubber; during the mixing process, the speed of the internal mixer is 40 rpm and the pressure is 15 MPa; add the second-stage mixed rubber into the internal mixer, add accelerator and sulfur, the speed is 30 rpm, the pressure of the internal mixer is 14 MPa, the top bolt is raised for 30 seconds, the glue is discharged, and the final mixed rubber is obtained.

[0041] Example 3 Prepare the raw materials: natural rubber 40phr, butadiene rubber 60phr, carbon black N330 37phr, carbon black N660 8phr, thermal cracking carbon black 8phr, environmentally friendly aromatic oil 5phr, zinc oxide 3phr, stearic acid 1phr, octyl phenolic tackifying resin 4phr, antioxidant 6PPD 1.5phr, antioxidant RD 1phr, microcrystalline wax 2phr, accelerator 1phr, sulfur 1.5phr. Add natural rubber and butadiene rubber to the internal mixer and plasticize for 30 seconds, then add the biomass reinforcing agent for preliminary mixing; the internal mixer speed is 50 rpm, the internal mixer pressure is 15 MP, the mixing time of the internal mixer is 2 minutes, and the rubber discharge temperature of the internal mixer is 120°C; add the prepared mixed rubber, 2 / 3 carbon black N330 and carbon black N660 to the internal mixer, mix for 1 minute, raise the top bolt and add the remaining 1 / 3 carbon black N330 and Carbon black N660, environmentally friendly aromatic oil, zinc oxide, stearic acid, octyl phenolic tackifying resin, antioxidant 6PPD, antioxidant RD, microcrystalline wax, mixing and heating to 150°C to discharge the rubber to obtain a two-stage mixed rubber; during the mixing process, the speed of the internal mixer is 40 rpm and the pressure is 15MPa; the second-stage mixed rubber is added to the internal mixer, and an accelerator and sulfur are added. The speed is 30 rpm, the pressure of the internal mixer is 17MPa, the top bolt is raised for 60s, the rubber is discharged, and the final mixed rubber is obtained.

[0042] Comparative Example 2 Prepare the raw materials of natural rubber 40phr, butadiene rubber 60phr, carbon black N330 37phr, carbon black N660 16phr, environmentally friendly aromatic oil 5phr, zinc oxide 3phr, stearic acid 1phr, octylphenol formaldehyde tackifying resin 4phr, antioxidant 6PPD 1.5phr, antioxidant RD 1phr, microcrystalline wax 2phr, accelerator 1phr, sulfur 1.5phr. Add natural rubber and butadiene rubber to the internal mixer and plasticate for 30s, then add the biomass reinforcing agent for preliminary mixing; the speed of the internal mixer is 50 rpm, the pressure of the internal mixer is 15MP, the mixing time of the internal mixer is 2min, and the discharge temperature of the internal mixer is 120℃; add the prepared mixed rubber, 2 / 3 carbon black N330 and carbon black N660 to the internal mixer, mix for 1min, raise the top bolt and add the remaining 1 / 3 carbon black N330 and Carbon black N660, environmentally friendly aromatic oil, zinc oxide, stearic acid, octyl phenolic tackifying resin, antioxidant 6PPD, antioxidant RD, microcrystalline wax, mixing and heating to 150°C to discharge the rubber to obtain a two-stage mixed rubber; during the mixing process, the speed of the internal mixer is 40 rpm and the pressure is 15MPa; the second-stage mixed rubber is added to the internal mixer, and an accelerator and sulfur are added. The speed is 30 rpm, the pressure of the internal mixer is 17MPa, the top bolt is raised for 60s, the rubber is discharged, and the final mixed rubber is obtained.

[0043] The raw materials and contents used in Examples 2-3 and Comparative Example 2 are shown in Table 3. Table 3 Raw materials and contents used in Example 2-3 and Comparative Example 2

[0044] The rubber materials made of the materials described in Comparative Example 2 and Examples 2-3 in Table 3 were tested and inspected, and the results are shown in Table 4: Table 4 Test results of Comparative Example 2 and Examples 2-3

[0045] As can be seen from Table 3, compared with Comparative Example 2, the rebound of Example 2 increases by 3 values, the tensile strength, elongation at break and modulus of elongation increase slightly or remain the same, with small fluctuations, and the compression heat generation decreases by 9°C; 60°C tanδ represents the hysteresis heat generation of the rubber compound, and the lower the 60°C tanδ value, the smaller the hysteresis heat generation of the rubber compound. Compared with Comparative Example 2, the hysteresis heat generation of Example 2 decreases by 19.4%. This shows that the rubber compound prepared by the present invention has excellent low heat generation performance. Although Example 3 using thermal cracking carbon black is basically consistent with Comparative Example 2 in mechanical properties, its compression heat generation increases by 4°C.

[0046] Combined with Figure 2It can be seen that compared with comparative example 2, ΔG' of example 2 is smaller, while ΔG' of example 3 is lower than comparative example 2 and higher than example 2, indicating that the rubber prepared by the preparation method of the present invention has better dispersion performance.

[0047] It can be seen from the above embodiments that compared with the prior art, the beneficial effects of the present invention are as follows: the rubber material prepared by the present invention uses lignin reinforcing fillers and lignin-based antioxidants to replace traditional carbon black fillers and petroleum-based antioxidant products, reducing the amount of petroleum-based chemicals in the formulation system, which is beneficial to reducing environmental pollution and carbon emissions, and the preparation process adopted can effectively promote the dispersion of lignin fillers; in the rubber composition prepared by the present invention, eucommia rubber is used, which can effectively improve the mechanical properties and fatigue properties of the vulcanized rubber. In the present invention, lignin is not only used as a filler, but also a lignin masterbatch product with better dispersibility is used as an antioxidant. At the same time, in order to improve the wear resistance of the rubber material, eucommia rubber is introduced to replace part of the solution-polymerized styrene-butadiene rubber. The results show that the bio-based sustainable tire tread rubber material provided by the present invention has low heat generation, good wear resistance, and has the same aging resistance as traditional tires.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bio-based sustainable tire tread rubber composition and a preparation method thereof, characterized in that: The composition comprises the following raw materials by weight: 10-50 phr of natural rubber, 30-90 phr of solution-polymerized styrene-butadiene rubber, 0-15 phr of eucommia rubber, 30-60 phr of carbon black, 5-20 phr of lignin reinforcing filler, 0-3 phr of lignin-based antioxidant, 1-6 phr of conventional antioxidant, 3-7 phr of zinc oxide, 0.2-2 phr of stearic acid, 1-3 phr of accelerator and 1-4 phr of vulcanizing agent.

2. A bio-based sustainable tire tread rubber composition and a preparation method thereof according to claim 1, characterized in that: The solution polymerized styrene butadiene rubber is a double-end modified solution polymerized styrene butadiene rubber, the styrene content in the solution polymerized styrene butadiene rubber is lower than 6%, and the glass transition temperature is lower than -45°C.

3. A bio-based sustainable tire tread rubber composition and a preparation method thereof according to claim 2, characterized in that: The eucommia rubber is trans-poly 1,4-isoprene, and the eucommia rubber is prepared by extracting eucommia seed shells through the steps of water washing, crushing, solvent dissolution, standing and the like.

4. The bio-based sustainable tire tread rubber composition and preparation method thereof according to claim 3, characterized in that: The lignin-based antioxidant is a masterbatch product prepared by loading lignin in styrene-butadiene rubber, and the effective content of the lignin antioxidant is 75%.

5. A bio-based sustainable tire tread rubber composition and a preparation method thereof according to claim 4, characterized in that: The lignin in the lignin antioxidant is derived from eucalyptus trees and contains the following groups: The content of group S in the group is greater than or equal to 40%.

6. A bio-based sustainable tire tread rubber composition and a preparation method thereof according to claim 5, characterized in that: The carbon black is medium-super wear-resistant carbon black with a particle size of 20-25 nm.

7. A bio-based sustainable tire tread rubber composition and a preparation method thereof according to claim 6, characterized in that: The lignin reinforcing filler is lignin sulfonate, and its particle size is within 10 μm.

8. The bio-based sustainable tire tread rubber composition and preparation method thereof according to claim 7, characterized in that: The conventional antioxidant is a mixture of antioxidant RD and 6PPD.

9. The bio-based sustainable tire tread rubber composition and preparation method thereof according to claim 8, characterized in that: The method for preparing the environmentally friendly rubber composition reinforced with biomass fillers comprises the following steps: Step 1: Heat the eucommia rubber in an oven at 60-90°C to soften the raw rubber so that it can be used in the next step of mixing; Step 2: Add natural rubber and the Eucommia rubber described in step 1 into an internal mixer and plasticize for 60-100 seconds, add solution-polymerized styrene-butadiene rubber and plasticize for 30 seconds, then add lignin reinforcing filler and perform preliminary mixing to obtain lignin reinforced filler masterbatch; Step 3: Add the rubber mix prepared in step 2 and 2 / 3 of carbon black into an internal mixer, mix for 1 minute, raise the top bolt and add the remaining 1 / 3 of carbon black, add zinc oxide, stearic acid, lignin-based antioxidant and conventional antioxidant, mix and heat to 150-160°C to discharge the rubber, and obtain a two-stage rubber mix; during the mixing process, the speed of the internal mixer is 40-80 rpm and the pressure is 15-18 MPa; Step 4: Add the second-stage mixed rubber, accelerator and vulcanizer into the internal mixer, rotate at 30-50 rpm, set the internal mixer pressure at 14-17 MPa, raise the top bolt in 30-60 seconds, discharge the rubber, and obtain the final mixed rubber.

10. The bio-based sustainable tire tread rubber composition and preparation method thereof according to claim 9, characterized in that: In step 2, the speed of the internal mixer is 50-90 rpm, the pressure of the internal mixer is 15-19 MPa, the mixing time of the internal mixer is 2-3.5 min, and the discharge temperature of the internal mixer is 120-145°C.

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