Light, high-strength and low-rolling-resistance tire for new energy automobile and preparation method thereof

Abstract

The invention provides a light, high-strength and low-rolling-resistance tire for a new energy automobile and a preparation method of the light, high-strength and low-rolling-resistance tire, and relates to the technical field of tires. The light, high-strength and low-rolling-resistance tire for the new energy automobile comprises a tread and a sidewall, wherein the tread and the sidewall are both composed of tread rubber comprising the following components: low-epoxy-degree epoxidized solution polymerized styrene-butadiene rubber with the epoxy degree of 6.5-8.4%, high-epoxy-degree epoxidized solution polymerized styrene-butadiene rubber with the epoxy degree of 21.2-23.7%, natural rubber, carbon black, white carbon black and a rubber additive. By optimizing the formula of the tread rubber, the lightweight of the tire is realized, the rolling resistance of the tire is effectively reduced, the strength and aging resistance of the tire are improved, and the service life of the tire is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and in particular to a lightweight, high-strength and low rolling resistance tire for new energy vehicles and a preparation method thereof. Background Art

[0002] In recent years, new energy vehicles have developed rapidly, and people are paying more and more attention to the driving safety, energy saving, and comfort of vehicles. As the only part of the car that contacts the ground, tires are required to have the following characteristics: lightweight, low rolling resistance, low noise, high wet grip and high load-bearing performance, low rolling resistance, high wear resistance, etc.

[0003] When a car is driving, it will produce various driving resistances, part of which is rolling resistance. The energy consumption required for the rolling resistance of automobile tires accounts for about 20% of the fuel consumption of the whole vehicle. Reducing the rolling resistance of tires can significantly reduce fuel consumption. In order to reduce the rolling resistance of tires, people have developed lightweight tires. At present, the main method to make tires lightweight is to change the tread and sidewall rubber of the tires. For example, the amount of rubber used in the rubber can be reduced, but the reduction in the amount of rubber will affect the durability of the tires, and the rigidity and handling stability of the tires will also be reduced; it can also be achieved by reducing the use of reinforcing fillers such as carbon black. Adding reinforcing fillers such as carbon black to rubber can improve the strength and wear resistance of rubber, but it will increase the quality of the tire. The friction between carbon black and between carbon black and rubber will also lead to an increase in rolling resistance. Therefore, reducing the use of carbon black can significantly reduce rolling resistance, but it will cause the strength and wear resistance of rubber to decrease. In addition, the rolling resistance of tires can be reduced by increasing the amount of sulfur, but the increase in the amount of sulfur will also cause a decrease in aging resistance.

[0004] Therefore, it is necessary to provide a new energy vehicle tire that is lightweight, high in strength, and has low rolling resistance. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a lightweight, high-strength and low rolling resistance tire for new energy vehicles and a preparation method thereof.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A lightweight, high-strength and low rolling resistance tire for new energy vehicles, comprising a tread and a sidewall; wherein:

[0008] The tread and the sidewall are both composed of tread rubber containing the following components: low-epoxy epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 6.5-8.4%, high-epoxy epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 21.2-23.7%, natural rubber, carbon black, white carbon black and rubber additives.

[0009] Furthermore, the epoxidation degree of the high-epoxidation-degree epoxidized solution-polymerized styrene-butadiene rubber is 22.4%; and the epoxidation degree of the low-epoxidation-degree epoxidized solution-polymerized styrene-butadiene rubber is 7.1%.

[0010] Furthermore, the mass ratio of the low-epoxidation epoxidized solution polymerized styrene butadiene rubber to the high-epoxidation epoxidized solution polymerized styrene butadiene rubber is (50-70):(10-20); preferably, the mass ratio of the low-epoxidation epoxidized solution polymerized styrene butadiene rubber to the high-epoxidation epoxidized solution polymerized styrene butadiene rubber is 60:18.

[0011] Furthermore, the rubber additives include aromatic oil, stearic acid, zinc oxide, sulfur, an accelerator, an antioxidant and a scorch retarder.

[0012] Furthermore, the tread rubber comprises the following components in parts by weight: 70-80 parts of low-epoxidation epoxidized solution-polymerized styrene-butadiene rubber and high-epoxidation epoxidized solution-polymerized styrene-butadiene rubber, 20-30 parts of natural rubber, 25-40 parts of carbon black, 15-25 parts of white carbon black, 1-10 parts of aromatic oil, 0.5-6 parts of stearic acid, 0.5-8 parts of zinc oxide, 0.2-6 parts of sulfur, 0.3-5 parts of accelerator, 0.5-8 parts of antioxidant, and 0.5-6 parts of scorch retarder.

[0013] Preferably, the tread rubber comprises the following components in parts by weight: 78 parts of low-epoxidation epoxidized solution-polymerized styrene-butadiene rubber and high-epoxidation epoxidized solution-polymerized styrene-butadiene rubber, 22 parts of natural rubber, 30 parts of carbon black, 20 parts of white carbon black, 5 parts of aromatic oil, 3 parts of stearic acid, 5 parts of zinc oxide, 3 parts of sulfur, 2 parts of accelerator, 5 parts of antioxidant, and 3 parts of scorch retarder.

[0014] Furthermore, 5 pattern blocks and 4 longitudinal grooves are arranged on the tread; the 5 pattern blocks are respectively a first shoulder pattern block, a first inner pattern block, a central pattern block, a second inner pattern block, and a second shoulder pattern block; a longitudinal groove I is formed between the first shoulder pattern block and the first inner pattern block, a longitudinal groove II is formed between the first inner pattern block and the central pattern block, a longitudinal groove III is formed between the central pattern block and the second inner pattern block, and a longitudinal groove IV is formed between the second inner pattern block and the second shoulder pattern block.

[0015] Preferably, the widths of the central pattern block, the first inner pattern block and the second inner pattern block are 13±1.5%, 12±1.5% and 12.5±1.5% of the ground contact surface width TDW respectively; the widths of the first shoulder pattern block and the second shoulder pattern block are 20±2% and 20±2% of TDW respectively.

[0016] Preferably, the widths of the four longitudinal grooves are all 5%±1 of TDW.

[0017] Preferably, the central pattern block is provided with central steel sheet transverse grooves and central steel sheets which are arranged at intervals and have the same inclination direction; the two ends of the central steel sheet transverse grooves are respectively connected with the longitudinal grooves II and III on both sides, one end of the central steel sheet is connected with the longitudinal grooves II, and the other end extends to the vicinity of the tread centerline; the angle between the setting direction of the central steel sheet transverse grooves and the tread centerline is 65±3°.

[0018] Preferably, the first inner steel sheet transverse grooves, the first inner steel sheet and the second inner steel sheet are arranged at intervals and have the same inclination direction on the first inner pattern block; the two ends of the first inner steel sheet transverse grooves are respectively connected with the longitudinal grooves I and II on both sides, the outer side of the first inner steel sheet is connected with the longitudinal groove I, and the other side extends to the vicinity of the center line of the first inner pattern block, the inner end of the second inner steel sheet is connected with the longitudinal groove II7, and the other end extends to the vicinity of the center line of the first inner pattern block; the angle between the setting direction of the first inner steel sheet transverse grooves and the center line of the tread is 68±5°.

[0019] Preferably, the second inner pattern block is arranged in a centrally symmetrical manner with the first inner pattern block.

[0020] Preferably, the first shoulder steel sheet transverse groove and the first shoulder steel sheet which are arranged at intervals and have the same inclination direction are provided on the first shoulder pattern block; the first shoulder steel sheet passes through the first shoulder pattern block, only the inner end of the first shoulder steel sheet is connected with the longitudinal groove I, and the length of the first shoulder steel sheet is smaller than the first shoulder steel sheet transverse groove; the angle between the setting direction of the first shoulder steel sheet transverse groove and the center line of the tread is 85±3°.

[0021] Preferably, the second shoulder pattern block is arranged in a centrally symmetrical manner with the first shoulder pattern block.

[0022] Preferably, the tread pattern pitch is 25 to 35 cm.

[0023] In a further embodiment, modified sepiolite fiber is used in the tread rubber instead of white carbon black, and the addition amount of the modified sepiolite fiber is 5-9% of the total weight of the rubber component (rubber component is low-epoxy epoxidized solution-polymerized styrene-butadiene rubber, high-epoxy epoxidized solution-polymerized styrene-butadiene rubber and natural rubber), and the modified sepiolite fiber is prepared by modifying the sepiolite fiber with a secondary amino-containing silane coupling agent. The modified sepiolite fiber is specifically prepared by the following method:

[0024] The sepiolite fiber is soaked in acid solution at 60-70°C for 6-8 hours. After soaking, it is filtered, dried and dispersed in DMF. A secondary amino silane coupling agent is added, and the reaction is carried out at 70-80°C for 2-3 hours. The fiber is filtered, washed with anhydrous ethanol and deionized water, and dried to obtain the modified sepiolite fiber.

[0025] Preferably, the acid solution is at least one of sulfuric acid, hydrochloric acid and nitric acid, and the mass fraction of the acid solution is 10-15%.

[0026] Preferably, the secondary amino group-containing silane coupling agent is bis(3-trimethoxysilylpropyl)amine and / or bis(3-triethoxysilylpropyl)amine.

[0027] Preferably, the amount of the secondary amino-containing silane coupling agent is 5-8.5% of the pretreated sepiolite fiber.

[0028] The present invention also provides a method for preparing a lightweight, high-strength and low rolling resistance tire for a new energy vehicle, comprising the following steps:

[0029] The tread rubber is mixed to obtain a mixed rubber, and then the tread and sidewall are made according to the tread pattern setting to prepare a lightweight, high-strength and low rolling resistance tire for new energy vehicles.

[0030] Furthermore, the preparation steps of the rubber compound include:

[0031] (1) adding low-epoxidation epoxidized solution-polymerized styrene-butadiene rubber, high-epoxidation epoxidized solution-polymerized styrene-butadiene rubber, and natural rubber into an internal mixer, and mixing them at a temperature of 135 to 160° C. to obtain a masterbatch;

[0032] (2) adding zinc oxide, stearic acid, paraffin wax and antioxidant, and mixing at a temperature of 120 to 155° C. to obtain a second-stage masterbatch;

[0033] (3) Add the second-stage masterbatch, sulfur, accelerator and scorch retarder, and mix at a temperature of 140-150°C to obtain a mixed rubber.

[0034] Preferably, the steps of preparing the rubber mix include:

[0035] (1) Add low-epoxy epoxidized solution-polymerized styrene-butadiene rubber, high-epoxy epoxidized solution-polymerized styrene-butadiene rubber, and natural rubber into an internal mixer, pressurize with a top bolt for 30 to 40 seconds, lift the top bolt and pressurize for 10 to 20 seconds, lift the top bolt at 135 to 145° C., add carbon black and white carbon black and pressurize for 15 to 25 seconds, lift the top bolt and pressurize for 10 to 18 seconds, lift the top bolt at a temperature of 150 to 160° C., open the discharge door, and obtain a masterbatch;

[0036] (2) Add zinc oxide, stearic acid, paraffin, and antioxidant to the internal mixer, pressurize the top bolt for 25 to 35 seconds, raise the top bolt at 120 to 130°C and pressurize for 18 to 25 seconds, raise the top bolt and pressurize for 10 to 20 seconds, raise the top bolt at 145 to 155°C, open the discharge door, and obtain the second-stage masterbatch;

[0037] (3) Add sulfur, accelerator and anti-scorch agent to the internal mixer, press the top bolt for 20 to 30 seconds, lift the top bolt and pressurize for 15 to 25 seconds, lift the top bolt and pressurize for 10 to 20 seconds, lift the top bolt at 145 to 155°C, start unloading, and obtain the mixed rubber.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The lightweight, high-strength and low rolling resistance tire for new energy vehicles provided by the present invention not only achieves the lightweight of the tire and effectively reduces the rolling resistance of the tire by optimizing the tread pattern and tread rubber formula, but also improves the strength and anti-aging performance of the tire and prolongs the service life of the tire.

[0040] 2. The lightweight, high-strength and low rolling resistance tire for new energy vehicles provided by the present invention enhances the overall rigidity of the tire pattern and effectively reduces the rolling resistance of the tire by rationally designing the transverse grooves and steel sheets in the tread pattern blocks.

[0041] 3. The lightweight, high-strength and low rolling resistance tire for new energy vehicles provided by the present invention uses two epoxidized solution-polymerized styrene-butadiene rubbers with different epoxidation degrees to replace the solution-polymerized styrene-butadiene rubber, which helps to enhance the interaction between rubber and filler carbon black and white carbon black, increase the dispersion of fillers in the matrix, and reduce the use of fillers, that is, it can still achieve excellent reinforcement effects under the premise of reducing the use of fillers, achieve lightweight while improving the strength of the tire, and effectively reduce the rolling resistance of the tire. By controlling the ratio and epoxidation degree of the two epoxidized solution-polymerized styrene-butadiene rubbers, it is also helpful to improve the anti-aging performance of the tire and improve the anti-wet skid performance.

[0042] 4. The lightweight, high-strength and low rolling resistance tire for new energy vehicles provided by the present invention uses modified sepiolite fiber instead of white carbon black in the tread rubber, and the compatibility of the modified sepiolite fiber with the rubber matrix is ​​improved, which can further reduce the tire It can reduce the use of white carbon black, reduce tire quality, and help further improve the tire's anti-aging performance and extend tire service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the tread pattern of a lightweight, high-strength and low rolling resistance tire for new energy vehicles of the present invention;

[0044] In the figure, the first shoulder pattern block-1, the first inner pattern block-2, the central pattern block-3, the second inner pattern block-4, the second shoulder pattern block-5, the longitudinal groove I-6, the longitudinal groove II-7, the longitudinal groove III-8, the longitudinal groove IV-9, the first pattern transverse groove-11, the first steel sheet fine groove-12, the second pattern transverse groove-21, the second steel sheet fine groove-22, the third pattern transverse groove-31, and the third fine groove-32. DETAILED DESCRIPTION

[0045] The following non-limiting examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way. The following content is only an exemplary description of the scope of the present invention, and those skilled in the art can make various changes and modifications to the invention of the present invention based on the disclosed content, and they should also fall within the scope of the present invention.

[0046] In the present invention, the accelerator, antioxidant and anti-scorch agent can be accelerators commonly used in the art without special limitation, for example, they can be one or more of guanidine accelerators and sulfonamide accelerators; the antioxidant can be one or more of amine antioxidants, diaryl secondary amine antioxidants or ketoamine antioxidants; the antioxidant can be one or more of organic acids, nitroso compounds and sulfonamides.

[0047] In the present invention, the epoxidized solution polymerized styrene butadiene rubber can be purchased directly from the market, or prepared from the solution polymerized styrene butadiene rubber by existing technology, such as being prepared by epoxidation with hydrogen peroxide and formic acid, without any special limitation; and the solution polymerized styrene butadiene rubber can be one or more of high styrene-based solution polymerized styrene butadiene rubber, medium styrene-based solution polymerized styrene butadiene rubber, and high vinyl solution polymerized styrene butadiene rubber, also without any special limitation.

[0048] The present invention is further described below by way of specific examples. Unless otherwise specified, the various chemical reagents used in the examples of the present invention are obtained through conventional commercial channels.

[0049] Examples 1-5

[0050] A lightweight, high-strength and low rolling resistance tire for new energy vehicles, comprising a tread and a sidewall; wherein:

[0051] The tread and the sidewall are both composed of a tread rubber comprising the components described in the following Table 1 (the components in the table are calculated by weight).

[0052] Table 1. Tread rubber composition (parts by weight)

[0053]

[0054]

[0055] The method for preparing the above-mentioned lightweight, high-strength and low rolling resistance tire for new energy vehicles comprises the following steps:

[0056] S1. Preparation of rubber compound:

[0057] Preferably, the step of segmented mixing comprises:

[0058] Add low-epoxy epoxidized solution-polymerized styrene-butadiene rubber, high-epoxy epoxidized solution-polymerized styrene-butadiene rubber and natural rubber into an internal mixer, pressurize with a top bolt for 30 seconds, raise the top bolt and pressurize for 10 seconds, raise the top bolt and add carbon black and white carbon black at 135°C and pressurize for 15 seconds, raise the top bolt and pressurize for 10 seconds, raise the top bolt at a temperature of 150°C, open the discharge door, and obtain a masterbatch;

[0059] (2) Add zinc oxide, stearic acid, paraffin, and antioxidant to the internal mixer, pressurize for 25 seconds with the top bolt, raise the top bolt at 120°C and pressurize for 18 seconds, raise the top bolt and pressurize for 10 seconds, raise the top bolt at 145°C, open the discharge door, and obtain the second-stage masterbatch;

[0060] (3) Add sulfur, accelerator, and anti-scorch agent to the internal mixer, press the top bolt for 20 seconds, raise the top bolt and pressurize for 15 seconds, raise the top bolt and pressurize for 10 seconds, raise the top bolt at 145°C, open the discharge, and obtain the mixed rubber, which is placed at room temperature for use;

[0061] S2. Then, the tread and sidewall are made according to the tread pattern setting to prepare a lightweight, high-strength and low rolling resistance tire for new energy vehicles.

[0062] The tread of the lightweight, high-strength and low rolling resistance tire for the new energy vehicle is as follows: Figure 1 The pattern structure shown in the figure has 5 pattern blocks and 4 longitudinal grooves on the tread, and the 5 pattern blocks are respectively a first shoulder pattern block 1, a first inner pattern block 2, a central pattern block 3, a second inner pattern block 4, and a second shoulder pattern block 5; a longitudinal groove I6 is formed between the first shoulder pattern block 1 and the first inner pattern block 2, a longitudinal groove II7 is formed between the first inner pattern block 2 and the central pattern block 3, a longitudinal groove III8 is formed between the central pattern block 3 and the second inner pattern block 4, and a longitudinal groove IV9 is formed between the second inner pattern block D and the second shoulder pattern block E.

[0063] Specifically, the widths of the central pattern block 3, the first inner pattern block 2, and the second inner pattern block 4 are 13±1.5%, 12±1.5%, and 12.5±1.5% of the ground contact surface width TDW, respectively; the widths of the first shoulder pattern block 1 and the second shoulder pattern block 5 are 20±2% and 20±2% of TDW, respectively. Specifically, the widths of the four longitudinal grooves are 5%±1 of TDW. By rationally designing the widths of the pattern blocks and longitudinal grooves, the force bearing area of ​​the tire can be guaranteed, the ground contact stability of the entire tire tread can be guaranteed, and the use of rubber can be reduced, thereby reducing rolling resistance.

[0064] Specifically, the central pattern block 3 is provided with a central steel sheet transverse groove 31 and a central steel sheet 32 ​​which are arranged at intervals and have the same inclination direction; the two ends of the central steel sheet transverse groove 31 are respectively connected with the longitudinal grooves II7 and III8 on both sides, one end of the central steel sheet 32 ​​is connected with the longitudinal groove II7, and the other end extends to the vicinity of the tread center line; the angle c between the setting direction of the central steel sheet transverse groove 31 and the tread center line is 65±3°.

[0065] Specifically, the first inner steel sheet transverse grooves 21, the first inner steel sheet 22 and the second inner steel sheet 23 are arranged at intervals and have the same inclination direction on the first inner pattern block 2; the two ends of the first inner steel sheet transverse groove 21 are respectively connected with the longitudinal grooves I6 and II7 on both sides, the outer end of the first inner steel sheet 22 is connected with the longitudinal groove I6, and the other end extends to the vicinity of the center line of the first inner pattern block 2, the inner end of the second inner steel sheet 23 (i.e., the end close to the longitudinal groove II7) is connected with the longitudinal groove II7, and the other end extends to the vicinity of the center line of the first inner pattern block 2; the angle b between the setting direction of the first inner steel sheet transverse groove 21 and the center line of the tread is 68±5°.

[0066] Specifically, the second inner pattern block 3 is arranged in a centrally symmetrical manner with the first inner pattern block 2 .

[0067] Specifically, the first shoulder steel sheet transverse groove 11 and the first shoulder steel sheet 12 which are arranged at intervals and have the same inclination direction are provided on the first shoulder pattern block 1; the first shoulder steel sheet transverse groove 11 runs through the first shoulder pattern block 1, and only the inner end of the first shoulder steel sheet 12 is connected with the longitudinal groove I6, and the length of the first shoulder steel sheet 12 is smaller than the first shoulder steel sheet transverse groove 11; the angle a between the setting direction of the first shoulder steel sheet transverse groove 11 and the center line of the tread is 85±3°.

[0068] Specifically, the second shoulder pattern block 5 is arranged in a centrally symmetrical manner with the first shoulder pattern block 1 .

[0069] Specifically, the tread pattern pitch is 28 cm.

[0070] Through the multi-angle pattern groove design and multi-angle steel plate design, the space formed by the contact between the pattern and the ground is reduced, and the groove area is increased, which can effectively reduce rolling resistance and increase drainage capacity and grip ability.

[0071] Embodiment 6-9

[0072] The difference from Example 2 is that the epoxidation degree of the low-epoxidation epoxidized solution-polymerized styrene-butadiene rubber and the high-epoxidation epoxidized solution-polymerized styrene-butadiene rubber are different, as shown in Table 2 below:

[0073] Table 2. Epoxidation degree of epoxidized solution-polymerized styrene-butadiene rubber

[0074] Group Example 6 Example 7 Example 8 Example 9 Highly epoxidized styrene butadiene rubber 20.3％ 21.2％ 23.7％ 25.5％ Low Epoxy Degree Epoxidized Solution Polymerized Styrene Butadiene Rubber 6.1％ 6.5％ 8.4％ 8.6％

[0075] Example 10

[0076] The difference from Example 2 is that the white carbon black is replaced by 9 parts by weight of modified sepiolite fiber, wherein the modified sepiolite fiber is prepared by the following method:

[0077] The sepiolite fiber is soaked in a 10% nitric acid solution at 60°C for 6 hours. After soaking, it is filtered, dried and dispersed in DMF, and bis(3-trimethoxysilylpropyl)amine (the amount is 8.5% of the weight of the pretreated sepiolite fiber) is added. The fiber is reacted at 70°C for 3 hours, filtered, washed with anhydrous ethanol and deionized water, and dried to obtain the modified sepiolite fiber.

[0078] Embodiment 11

[0079] The difference from Example 10 is that bis(3-trimethoxysilylpropyl)amine is replaced by an equal amount of γ-aminopropyltrimethoxysilane.

[0080] Example 12

[0081] The difference from Example 11 is that the modified sepiolite fiber is replaced by unmodified sepiolite fiber, and the amount used remains unchanged.

[0082] Comparative Example 1

[0083] The difference from Example 2 is that the epoxidized solution polymerized styrene butadiene rubber is only low-epoxidation-degree epoxidized solution polymerized styrene butadiene rubber, and the total amount of the epoxidized solution polymerized styrene butadiene rubber remains unchanged.

[0084] Comparative Example 2

[0085] The difference from Example 2 is that the epoxidized solution polymerized styrene butadiene rubber is only a high-epoxidation-degree epoxidized solution polymerized styrene butadiene rubber, and the total amount of the epoxidized solution polymerized styrene butadiene rubber remains unchanged.

[0086] Comparative Example 3

[0087] The difference from Example 2 is that the low-epoxidation-degree epoxidized solution-polymerized styrene-butadiene rubber and the high-epoxidation-degree epoxidized solution-polymerized styrene-butadiene rubber are replaced by an equal amount of solution-polymerized styrene-butadiene rubber.

[0088] Test Example 1

[0089] 1. Mechanical properties

[0090] The rubber mixtures obtained in the above examples and comparative examples were vulcanized at 161°C for 20 minutes, and then tested with reference to the standard GB / T528-2009, and the results are shown in Table 3. Then, with reference to the standard GB / T3512-2014, the mechanical properties were tested after thermal oxidation aging at 100°C for 72 hours, and the results are shown in Table 4.

[0091] 2. DMA test tanδ-T curve scanning: sample size 80×10×2mm, vibration frequency 10Hz, heating rate 3℃ / min, dynamic strain 2.5%, scanning temperature range -100~100℃, the results are shown in Table 5 below.

[0092] Table 3

[0093]

[0094]

[0095] As can be seen from the above table, the tread rubber of the present invention uses epoxidized solution polymerized styrene butadiene rubber instead of solution polymerized styrene butadiene rubber, and its mechanical properties are significantly improved, and the white carbon black in the tread rubber is replaced by modified sepiolite fiber, and its mechanical properties are improved, and the amount of modified sepiolite fiber is significantly lower than that of white carbon black, which further realizes the lightweight of the tire.

[0096] Table 4

[0097] Group Tensile strength(Mpa) Elongation at break (%) 300% tensile stress (Mpa) 100% tensile stress (Mpa) Example 1 23.10 515.84 15.23 4.93 Example 2 24.69 544.67 15.60 5.59 Example 3 23.99 523.56 15.62 5.61 Example 4 20.02 442.51 17.64 5.93 Example 5 20.84 478.52 17.23 4.98 Example 6 19.90 494.64 17.21 5.07 Example 7 23.59 529.58 15.74 5.62 Example 8 24.16 526.02 16.27 5.53 Example 9 19.86 454.11 16.23 4.38 Example 10 26.93 574.00 15.40 5.37 Embodiment 11 25.42 524.47 16.23 5.75 Example 12 22.60 503.13 16.10 6.01 Comparative Example 1 18.29 435.65 18.09 3.90 Comparative Example 2 15.55 335.59 16.65 4.77 Comparative Example 3 16.23 366.27 17.61 3.42

[0098] As can be seen from the above table, after 72 hours of thermal oxidative aging, the tensile strength and elongation at break of the tread rubber of the present invention slightly decreased, and the 300% tensile stress and 100% tensile stress slightly increased, but the change range was small, indicating that the tread rubber has excellent anti-aging performance. In addition, the tread rubber of the present invention uses high-epoxy epoxidized solution-polymerized styrene-butadiene rubber and low-epoxy epoxidized solution-polymerized styrene-butadiene rubber instead of unepoxidized solution-polymerized styrene-butadiene rubber, which not only improves the strength, but also helps to improve the anti-thermal oxidative aging performance.

[0099] Table 5

[0100] Group tanδ@60℃ tanδ@0℃ Example 1 0.070 0.581 Example 2 0.063 0.610 Example 3 0.068 0.602 Example 4 0.087 0.471 Example 5 0.096 0.455 Example 6 0.094 0.463 Example 7 0.063 0.567 Example 8 0.069 0.575 Example 9 0.102 0.511 Example 10 0.051 0.688 Embodiment 11 0.067 0.617 Example 12 0.109 0.501 Comparative Example 1 0.117 0.458 Comparative Example 2 0.128 0.419 Comparative Example 3 0.136 0.446

[0101] The tire specifications obtained in the above-mentioned embodiment and comparative example are both 225 / 55R17 97W. As shown in the table, compared with comparative examples 1-3, the tanδ@60℃ of the tire obtained in the embodiment is significantly reduced, that is, the rolling resistance is reduced. It can be seen that the addition of two solution-polymerized styrene-butadiene rubbers with different epoxidation degrees to the tread rubber of the present invention helps to reduce the rolling resistance of the tire. It can also be seen that the tanδ@60℃ of the tire obtained in the embodiment is higher than that in the comparative example, indicating that the addition of two epoxidized solution-polymerized styrene-butadiene rubbers with different epoxidation degrees to the tread rubber instead of the solution-polymerized styrene-butadiene rubber can not only reduce the rolling resistance, but also help to improve the anti-skid performance of the tire.

[0102] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and 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. A lightweight, high-strength and low rolling resistance tire for new energy vehicles, characterized in that: It includes a tread and a sidewall; wherein, The tread and the sidewall are both composed of tread rubber containing the following components: low-epoxy epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 6.5-8.4%, high-epoxy epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 21.2-23.7%, natural rubber, carbon black, white carbon black and rubber additives.

2. A lightweight, high-strength and low rolling resistance tire for new energy vehicles according to claim 1, characterized in that: The mass ratio of the low-epoxidation epoxidized solution polymerized styrene butadiene rubber to the high-epoxidation epoxidized solution polymerized styrene butadiene rubber is (50-70):(10-20); preferably, the mass ratio of the low-epoxidation epoxidized solution polymerized styrene butadiene rubber to the high-epoxidation epoxidized solution polymerized styrene butadiene rubber is 60:

18.

3. A lightweight, high-strength and low rolling resistance tire for new energy vehicles according to claim 1, characterized in that: The rubber additive comprises aromatic oil, stearic acid, zinc oxide, sulfur, an accelerator, an antioxidant and a scorch retarder.

4. A lightweight, high-strength and low rolling resistance tire for new energy vehicles according to claim 3, characterized in that: The tread rubber comprises the following components in parts by weight: 70-80 parts of low-epoxidation epoxidized solution-polymerized styrene-butadiene rubber and high-epoxidation epoxidized solution-polymerized styrene-butadiene rubber, 20-30 parts of natural rubber, 25-40 parts of carbon black, 15-25 parts of white carbon black, 1-10 parts of aromatic oil, 0.5-6 parts of stearic acid, 0.5-8 parts of zinc oxide, 0.2-6 parts of sulfur, 0.3-5 parts of accelerator, 0.5-8 parts of antioxidant, and 0.5-6 parts of scorch retarder.

5. A lightweight, high-strength and low rolling resistance tire for new energy vehicles according to any one of claims 1 to 4, characterized in that: The tread is provided with 5 pattern blocks and 4 longitudinal grooves; the 5 pattern blocks are respectively a first shoulder pattern block, a first inner pattern block, a central pattern block, a second inner pattern block, and a second shoulder pattern block; a longitudinal groove I is formed between the first shoulder pattern block and the first inner pattern block, a longitudinal groove II is formed between the first inner pattern block and the central pattern block, a longitudinal groove III is formed between the central pattern block and the second inner pattern block, and a longitudinal groove IV is formed between the second inner pattern block and the second shoulder pattern block.

6. A lightweight, high-strength and low rolling resistance tire for new energy vehicles according to claim 5, characterized in that: The widths of the central pattern block, the first inner pattern block and the second inner pattern block are 13±1.5%, 12±1.5% and 12.5±1.5% of the ground contact surface width TDW respectively; the widths of the first shoulder pattern block and the second shoulder pattern block are 20±2% and 20±2% of TDW respectively.

7. A lightweight, high-strength and low rolling resistance tire for new energy vehicles according to claim 5, characterized in that: The central pattern block is provided with central steel sheet transverse grooves and central steel sheets arranged at intervals and having the same inclination direction; The first inner steel sheet transverse grooves, the first inner steel sheet and the second inner steel sheet are arranged at intervals and have the same inclination direction on the first inner pattern block; The first shoulder pattern block is provided with first shoulder steel sheet transverse grooves and first shoulder steel sheets which are arranged at intervals and have the same inclination direction.

8. A lightweight, high-strength and low rolling resistance tire for new energy vehicles according to claim 7, characterized in that: The second inner pattern block is arranged in a centrally symmetrical manner with the first inner pattern block; and the second shoulder pattern block is arranged in a centrally symmetrical manner with the first shoulder pattern block.

9. A method for preparing a lightweight, high-strength and low rolling resistance tire for new energy vehicles according to any one of claims 1 to 8, characterized in that: The following steps are involved: The tread rubber is mixed to obtain a mixed rubber, and then the tread and sidewall are made according to the tread pattern setting to prepare a lightweight, high-strength and low rolling resistance tire for new energy vehicles.

10. The preparation method according to claim 9, characterized in that: The preparation steps of the rubber compound include: (1) adding low-epoxidation epoxidized solution-polymerized styrene-butadiene rubber, high-epoxidation epoxidized solution-polymerized styrene-butadiene rubber, and natural rubber into an internal mixer, and mixing at 135-160° C. to obtain a masterbatch; (2) adding zinc oxide, stearic acid, paraffin wax, and antioxidant, and kneading at 120-155° C. to obtain a second-stage masterbatch; (3) Add the second-stage masterbatch, sulfur, accelerator and scorch retarder, and mix at 140-150°C to obtain the mixed rubber.

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