Tire tread rubber composition with high bio-based content

Abstract

The invention provides a tire tread rubber composition with high bio-based content. The composition is prepared from the following raw materials in parts by weight: 10-40 parts of natural rubber; 0 to 30 parts of modified polystyrene-butadiene rubber; 50 to 80 parts of bio-based itaconate rubber; 5 to 20 parts of bio-based carbon black; 50-90 parts of rice hull ash white carbon black; 0-20 parts of biological base oil; 4-8 parts of a bio-based silane coupling agent; 5-30 parts of bio-based wet skid resistant resin; according to the composition, bio-based resources are used as main raw materials, dependence on petroleum resources is reduced, and carbon emission in the production process is reduced; the rubber composition basically does not contain harmful chemical substances, and is safer and more reliable to use.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and in particular to a tire tread rubber composition with a high bio-based content. Background Art

[0002] In the field of tire manufacturing and application, with the continuous growth of global environmental awareness, the environmental problems of traditional petroleum-based semi-steel radial tires have become increasingly prominent. The production process of traditional petroleum-based tires relies on non-renewable petroleum resources, which not only faces the potential crisis of resource shortage, but also seriously pollutes the environment through the exhaust gas, wastewater, and solid waste generated during the production process. During the use stage, microplastic particles produced by tire wear enter the natural environment, increasing the burden on the ecosystem. At the same time, the disposal of aging and discarded tires also faces challenges such as low recycling rates and the risk of secondary pollution.

[0003] Especially for high-performance tires like aircraft tires, their specialized performance requirements increase their reliance on petroleum-based rubber materials, further exacerbating environmental pressures. Against this backdrop, the development of a high-biobased tire tread rubber composition and its preparation method not only effectively reduces reliance on petroleum resources, minimizes environmental pollution during production and use, and achieves energy conservation and emission reduction goals, but also aligns with the concept of green development, possessing significant practical significance and broad application prospects for promoting the sustainable development of the tire industry. Summary of the Invention

[0004] The object of the present invention is to provide a tire tread rubber composition with a high bio-based content to solve the technical problems existing in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A tire tread rubber composition with a high biobased content is composed of the following raw materials, in parts by weight: 10-40 parts of medium natural rubber; 0-30 parts of modified solution polystyrene-butadiene rubber; 50-80 parts of bio-based itaconate rubber; 5-20 parts of bio-based carbon black; 50-90 parts of rice husk ash white carbon black; 0-20 parts of bio-based oil; 4-8 parts of bio-based silane coupling agent; 5-30 parts of bio-based anti-skid resin; 2-6 parts of bio-based white carbon black dispersant; 1-6 parts of bio-based stearic acid; 2-5 parts of antioxidant; and 3-7 parts of vulcanizing agent.

[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In an optional solution: natural rubber is a 20# standard natural rubber or a 10# standard natural rubber or a 5# standard natural rubber or an RSS3# standard natural rubber.

[0009] In an optional solution, the modified polystyrene-butadiene rubber has a styrene content of 10% to 40%, a vinyl content of 40% to 70%, and a Tg point of -40°C to -20°C.

[0010] In an optional embodiment, the bio-based itaconate rubber is dibasic itaconate (butyl ester, ethyl ester).

[0011] In one alternative, the specific surface area of ​​bio-based carbon black is 70-130 g / kg, and the oil absorption value is 60-13010 -5 m 3 / kg.

[0012] In an optional solution, the specific surface area of ​​the rice husk ash white carbon black is 150-210 g / kg, and the silicon dioxide content is ≥90.0%.

[0013] In an optional solution, the bio-based oil has a Tg point of -50°C to -90°C and is derived from renewable bio-based materials.

[0014] In an optional solution: the bio-based anti-slip resin is one or both of DCPD resin and α-methylstyrene resin made from bio-based materials.

[0015] In an optional solution, the bio-based silica dispersant is a product made from bio-based materials.

[0016] In an optional solution, the bio-based silane coupling agent is a silane coupling agent made from bio-based materials.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects:

[0018] This proposal proposes the extensive use of bio-based rubber (natural rubber, itaconate rubber), fillers (bio-based carbon black, rice husk silica), and additives (vegetable oil, bio-based resin, bio-based anti-slip resin, bio-based stearic acid) to create a new, high-performance, high-biobased tire tread composition. This new, high-biobased rubber composition offers advantages such as environmental protection and energy conservation, excellent safety, and tire performance comparable to petroleum-based rubber compositions. Using bio-based resources as the primary raw material reduces dependence on petroleum resources and lowers carbon emissions during production. The rubber composition is virtually free of harmful chemicals, making it safer and more reliable to use. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1

[0021] Rubber compounds with the compositions specified in Tables 1 and 2 were prepared in a BR Banbury internal mixer using four separate mixing stages: three non-productive mixing stages and one productive mixing stage. Each non-productive mixing stage lasted approximately 3-4 minutes. After the high-temperature silane coupling modification during the mixing stage, the mixing temperature reached 140-150°C, marking the end of the mixing. The productive mixing stage was completed when the rubber reached a temperature of 95-105°C within the internal mixer.

[0022] The rubber compositions are referred to herein as 1#-comparative example, 2#, and 3#, respectively.

[0023] Table 1 Example 1 Scheme

[0024]

[0025]

[0026] All samples had a bio-based content exceeding 80%. The compounds were vulcanized at 151°C for 30 min. Table 2 shows the performance test values ​​of the above-mentioned mixed compounds.

[0027] Test the tanδ value. The higher the tanδ value at 0℃, the better the anti-skid performance.

[0028] Test the tanδ value. A higher tanδ value at 25°C indicates better dry braking performance.

[0029] Test the tanδ value. The lower the tanδ value at 60℃, the better the rolling resistance performance.

[0030] Detect the dynamic Tg point. The lower the test value, the wider the usable ambient temperature range.

[0031] Table 2 DMA detection values

[0032] DMA value 1#-Comparative Example 1 2# 3# Tg -13.1 -10.2 -7.5 0℃tanδ 0.602 0.650 0.614 tanδ at 25℃ 0.204 0.213 0.189 60℃tanδ 0.120 0.116 0.127

[0033] The test data of Example 1 is shown in Table 2. The results indicate that selecting an appropriate ratio of itaconate rubber and combining it with natural rubber and polystyrene-butadiene rubber, and co-producing it with various bio-based materials, can impart the rubber with high wet slip, excellent dry grip, and excellent rolling resistance, meeting the requirements of European regulations with strict requirements for dry and wet braking in ambient temperatures greater than -5°C, as well as the requirements for use in most regions of China.

[0034] Example 2

[0035] The formulations in Table 3 were mixed according to the mixing process of Example 1.

[0036] Table 3 Example solution

[0037]

[0038]

[0039] The preparation, vulcanization and testing methods of the rubber mix were the same as those in Example 1.

[0040] Table 4 Detection values

[0041] DMA value result Tg -10.6 0℃tanδ 0.662 tanδ at 25℃ 0.213 60℃tanδ 0.114

[0042] The test values ​​are shown in Table 4. The results show that the test results are consistent with the performance of Solution 2# in Example 1 and meet the requirements.

[0043] Taking the 245 / 45R19 tire as an example, a finished tire was produced by using mass-produced ordinary tire components, and only the high-biobased content tread rubber composition of the present invention was used to replace the original petroleum-based tread composition; the rolling resistance coefficient of the tire was tested to be 6.1N / kN, reaching the labeling regulation rolling resistance level A (RRC≤6.5); at the same time, the tire was tested for wet skid performance, and the wet skid index result was 1.54, reaching the wet skid labeling level B (1.4≤G≤1.54); the finished tire groove depth was 7.0mm, and through road testing using actual vehicle wear verification, the tire had a minimum wear mileage of more than 55,000 kilometers and an average wear mileage of more than 68,000 kilometers, meeting the market demand level.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tire tread rubber composition with a high biobased content, characterized in that: The invention is composed of the following raw materials in parts by weight: 10-40 parts of medium natural rubber; 0-30 parts of modified solution polystyrene-butadiene rubber; 50-80 parts of bio-based itaconate rubber; 5-20 parts of bio-based carbon black; 50-90 parts of rice husk ash white carbon black; 0-20 parts of bio-based oil; 4-8 parts of bio-based silane coupling agent; 5-30 parts of bio-based anti-slip resin; 2-6 parts of bio-based white carbon black dispersant; 1-6 parts of bio-based stearic acid; 2-5 parts of antioxidant; and 3-7 parts of vulcanizing agent.

2. The tire tread rubber composition with high biobased content according to claim 1, characterized in that The natural rubber is a 20# standard natural rubber, a 10# standard natural rubber, a 5# standard natural rubber, or an RSS3# standard natural rubber.

3. The tire tread rubber composition with high biobased content according to claim 1, characterized in that The modified polystyrene-butadiene rubber has a styrene content of 10% to 40%, a vinyl content of 40% to 70%, and a Tg point of -40°C to -20°C.

4. The tire tread rubber composition with high biobased content according to claim 1, characterized in that The bio-based itaconate rubber is a dibasic itaconate.

5. The tire tread rubber composition with high biobased content according to claim 1, characterized in that The specific surface area of ​​bio-based carbon black is 70-130g / kg, and the oil absorption value is 60-13010 -5 m 3 / kg.

6. The tire tread rubber composition with high biobased content according to claim 1, characterized in that The specific surface area of ​​rice husk ash white carbon black is 150-210 g / kg, and the silicon dioxide content is ≥90.0%.

7. The tire tread rubber composition with high biobased content according to claim 1, characterized in that Bio-based oil has a Tg point of -50°C to -90°C and is derived from renewable bio-based materials.

8. The tire tread rubber composition with high biobased content according to claim 1, characterized in that The bio-based anti-slip resin is one or both of DCPD resin and α-methylstyrene resin made from bio-based materials.

9. The tire tread rubber composition with high biobased content according to claim 1, characterized in that Bio-based silica dispersants are products made from bio-based materials.

10. The tire tread rubber composition with high biobased content according to claim 1, characterized in that Bio-based silane coupling agent is a silane coupling agent made from bio-based materials.

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