A low-noise and low-rolling resistance tire for new energy vehicles and a preparation method thereof

Abstract

The present application discloses a low-noise and low rolling resistance tire tread for new energy vehicles and a preparation method thereof, and belongs to the field of vehicle tire technology. The low-noise and low rolling resistance tire tread for new energy vehicles includes the following components by weight: 90-150 parts of rubber, 10-15 parts of modified carbon black, 15-25 parts of white carbon black, 1-3 parts of coupling agent, 2-5 parts of stearic acid, 5-10 parts of zinc oxide, 0.5-3 parts of antioxidant, 2-8 parts of sulfur, 0.2-2 parts of accelerator and 5-15 parts of filler oil; rubber includes natural rubber, butadiene rubber and epoxidized solution-polymerized styrene-butadiene rubber. The present application enhances and improves the mechanical properties of the tire tread by adding modified carbon black and white carbon black, the dispersibility of the modified carbon black is improved, and the modified carbon black cooperates with the coupling agent to enhance the interfacial interaction and reduce the hysteresis loss caused by the friction between the rubber molecular chains; by compounding the three rubbers and coordinating with specific fillers and additives, a balance of low noise, low rolling resistance and high wear resistance is achieved.

Description

Technical Field

[0001] The present application relates to a low-noise and low-rolling resistance tire for new energy vehicles and a preparation method thereof, and belongs to the technical field of vehicle tires. Background Art

[0002] With the rapid development of the automobile industry and people's increasing requirements for automobile performance, domestic and foreign automobile manufacturers have put forward higher and higher requirements on tires, their main components, because tires are the most direct transmission components between cars and roads, and the performance of tires is directly related to the handling, comfort and safety of the car.

[0003] Compared with internal combustion vehicles, electric vehicles are not affected by engine noise. Electric vehicle owners are more sensitive to noise inside the car, especially tire noise, so reducing tire noise is crucial for comfortable driving. In addition, the original intention of designing new energy vehicles is to save energy. Therefore, low rolling resistance is an important requirement for new energy vehicle tires. In order to increase the vehicle's cruising range and reduce battery power consumption, tires that match electric vehicles need to have lower rolling resistance. At present, the production and sales of electric vehicles are increasing, and existing tires cannot fully meet the requirements of electric vehicles. It is very necessary to develop electric vehicle tires.

[0004] In the prior art, in order to strengthen rubber materials, traditional reinforcing fillers, carbon black and white carbon black are widely used. Although carbon black reinforced rubber materials have good wear resistance, the addition of these raw materials also increases the cohesion and viscosity of the tire, resulting in increased rolling resistance of the tire. How to achieve a balance between low noise, low rolling resistance and high wear resistance is an urgent problem to be solved in the field of new energy vehicle tires. Summary of the invention

[0005] In order to solve the above problems, a low-noise and low rolling resistance tire tread for new energy vehicles and a preparation method thereof are provided, and the component composition and ratio of the low-noise and low rolling resistance tire tread for new energy vehicles are specifically disclosed. The mechanical properties of the tire tread are enhanced by adding modified carbon black and white carbon black, the dispersibility of the modified carbon black is improved, and the modified carbon black cooperates with a coupling agent to enhance the interface interaction and reduce the hysteresis loss caused by the friction between rubber molecular chains; by compounding the three rubbers and combining them with specific fillers and additives, a balance between low noise, low rolling resistance and high wear resistance is achieved.

[0006] According to one aspect of the present application, a low-noise and low rolling resistance tire tread for new energy vehicles is provided, which includes the following components in parts by weight: 90-150 parts of rubber, 10-15 parts of modified carbon black, 15-25 parts of white carbon black, 1-3 parts of coupling agent, 2-5 parts of stearic acid, 5-10 parts of zinc oxide, 0.5-3 parts of antioxidant, 2-8 parts of sulfur, 0.2-2 parts of accelerator and 5-15 parts of filler oil; the rubber includes natural rubber, butadiene rubber and epoxidized solution-polymerized styrene-butadiene rubber.

[0007] Optionally, the mass ratio of the natural rubber, butadiene rubber and epoxidized solution-polymerized styrene-butadiene rubber is 1:(0.5-1):(1-2).

[0008] Specifically, the present application stipulates that natural rubber, cis-1,4-butadiene rubber and epoxidized solution-polymerized styrene-butadiene rubber are compounded in a specific ratio and matched with specific fillers and additives to achieve a balance between low noise, low rolling resistance and high wear resistance.

[0009] Optionally, the modified carbon black is prepared from tea polyphenol-modified carbon black, and the preparation method of the modified carbon black is to add tea polyphenol into a carbon black solution, and then heat and stir after ultrasonic mixing to obtain the modified carbon black; the mass ratio of the carbon black to the tea polyphenol is 1:0.05-0.1.

[0010] Specifically, the present application utilizes tea polyphenols to modify carbon black. On the one hand, tea polyphenols are adsorbed in the pores of carbon black, the large pore size of carbon black is reduced, and the proportion of small pores is increased, which is beneficial to improve the dispersibility of carbon black and can reduce hysteresis loss and dynamic energy loss; on the other hand, the ortho-phenolic hydroxyl groups of tea polyphenols are easily oxidized into ortho-quinone groups, which can undergo bonding reactions with sulfur-containing substances and promote vulcanization.

[0011] In addition, in addition to modifying carbon black, tea polyphenols also produce a complexation with zinc ions during the vulcanization process, which is beneficial to the combination of white carbon black and the rubber matrix, forming a strong interface bond between rubber and white carbon black to improve the mechanical properties.

[0012] Optionally, the preparation of the coupling agent comprises the following steps:

[0013] (1) 1,6-hexanediamine and 2-adamantanone are dissolved in toluene, p-toluenesulfonic acid is added, and the mixture is heated under reflux to remove water generated during the reaction until no more excess water is generated and the reaction is terminated;

[0014] (2) The reaction solution was washed twice with a saturated sodium chloride solution, and then the organic layer was separated. Anhydrous sodium sulfate was added to remove water, and then the solvent was removed by rotary evaporation and dried to obtain the final brown oily product.

[0015] Specifically, although the dispersibility of modified carbon black is improved, its performance of capturing free radicals is affected. In this application, a specific coupling agent is combined with modified carbon black, and the imine in the coupling agent captures rubber macromolecular free radicals and converts them into relatively stable adamantyl free radicals, which are then more easily combined with the modified carbon black; the rubber macromolecular free radicals are promoted to transfer to the carbon black surface, thereby enhancing the interface interaction.

[0016] Specifically, the present application makes specific restrictions on the number of coupling agents added. If too little coupling agent is added, it will affect the capture of rubber macromolecular free radicals; if too much coupling agent is added, too much adamantane imine will be grafted onto the rubber molecular chain, thereby increasing the polarity of the rubber, thereby increasing the hysteresis loss caused by the internal friction between the rubber molecular chains, and increasing the rolling resistance.

[0017] Optionally, the molar ratio of the 1,6-hexanediamine to 2-adamantanone is 1:2-3; the molar ratio of the 1,6-hexanediamine to p-toluenesulfonic acid is 1:0.1-0.15.

[0018] Specifically, the present application makes specific restrictions on the molar ratio of 1,6-hexanediamine, 2-adamantanone and toluenesulfonic acid, so that the amino group of hexanediamine and the carbonyl group of adamantanone undergo nucleophilic addition to obtain a coupling agent.

[0019] Optionally, the epoxidation degree of the epoxidized solution-polymerized styrene-butadiene rubber is 10-15%; the antioxidant is one or more of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, N-phenyl-α-aniline, N-phenyl-β-naphthylamine, N-phenyl-Nˋ-cyclohexyl-p-phenylenediamine, N-phenyl-Nˋ-isopropyl-p-phenylenediamine, N-Nˋ-diphenyl-p-phenylenediamine, 4.4-bis(2.2-dimethylbenzyl)diphenylamine; the accelerator is one or more of NS, DPG, and CZ; and the filler oil is cycloparaffin oil or aromatic oil.

[0020] Specifically, the present application makes specific restrictions on the epoxidation degree of the epoxidized solution polymerized styrene butadiene rubber. If the epoxidation degree of the epoxidized solution polymerized styrene butadiene rubber is too high, it will affect the dispersion of silica, resulting in poor compatibility of the epoxidized solution polymerized styrene butadiene rubber with other components.

[0021] Specifically, the epoxy groups on the epoxidized solution polystyrene butadiene rubber can react with the silanol groups on the surface of silica, thereby reducing the polarity of silica, improving its dispersibility, weakening the interaction between silicas, reducing hysteresis loss, and thus reducing rolling resistance.

[0022] Optionally, the pattern of the tire tread includes 4 longitudinal main grooves, which are, from the outside to the inside, the first longitudinal main groove, the second longitudinal main groove, the third longitudinal main groove and the fourth longitudinal main groove; a sound absorption pattern is provided between the first longitudinal main groove and the second longitudinal main groove, and the second longitudinal main groove and the fourth longitudinal main groove are provided with a plurality of circumferentially arranged central continuous transverse grooves, and the central continuous transverse grooves are cross-connected with the third longitudinal main groove.

[0023] Specifically, the central continuous transverse groove crosses the third longitudinal main groove obliquely, and the central continuous transverse groove is inclined from the upper side to the lower right side.

[0024] Specifically, the tire tread pattern in the present application greatly improves drainage performance and enhances the braking and handling performance of the tire on slippery roads by providing four longitudinal main grooves and a central continuous transverse groove. The noise generated by the resonance of the tire pattern blocks is effectively reduced by providing sound-absorbing patterns.

[0025] Optionally, a shoulder pattern is further included, wherein the shoulder pattern includes a first shoulder pattern and a second shoulder pattern, wherein the first shoulder pattern is an arc-shaped fine groove, and the second shoulder pattern includes two short fold line grooves.

[0026] Specifically, the shoulder portion in the present application is designed to be asymmetrical, which prevents excessive tilting during sharp and high-speed steering and enhances steering response.

[0027] Specifically, the shoulder of the present application is designed with multiple pitches, which is helpful in reducing tire noise.

[0028] According to another aspect of the present application, the present application also provides a method for preparing the above-mentioned low-noise and low-rolling-resistance tire tread for new energy vehicles, comprising the following steps:

[0029] (1) adding natural rubber, butadiene rubber, modified carbon black and coupling agent into an internal mixer and mixing for 30-50 seconds to obtain a first masterbatch;

[0030] (2) adding epoxidized solution-polymerized styrene-butadiene rubber, white carbon black, stearic acid, zinc oxide, filler oil and antioxidant into an internal mixer, and mixing for 50-250 seconds to obtain a second masterbatch;

[0031] (3) adding sulfur and an accelerator into an internal mixer for vulcanization to obtain a low-noise and low-rolling-resistance tire tread for new energy vehicles.

[0032] Optionally, the debonding temperature in step (1) is 130-150°C; the debonding temperature in step (2) is 110-120°C; the vulcanization time in step (3) is 60-80s, and the debonding temperature is 90-105°C.

[0033] The beneficial effects of this application include but are not limited to:

[0034] 1. According to the low-noise and low rolling resistance tire tread for new energy vehicles of the present application, the component composition and ratio of the low-noise and low rolling resistance tire tread for new energy vehicles are specifically disclosed. The mechanical properties of the tire tread are enhanced by adding modified carbon black and white carbon black, the dispersibility of the modified carbon black is improved, and the modified carbon black cooperates with the coupling agent to enhance the interface interaction and reduce the hysteresis loss caused by the friction between the rubber molecular chains; by compounding the three rubbers and combining them with specific fillers and additives, a balance between low noise, low rolling resistance and high wear resistance is achieved.

[0035] 2. According to the low-noise and low rolling resistance tire tread for new energy vehicles of the present application, the present application makes specific restrictions on the preparation method of the coupling agent and the number of coupling agents added. If too little coupling agent is added, it will affect the capture of rubber macromolecular free radicals; if too much coupling agent is added, too much adamantane imine will be grafted on the rubber molecular chain, thereby increasing the polarity of the rubber, thereby increasing the hysteresis loss caused by the internal friction between the rubber molecular chains, and increasing the rolling resistance; a specific number of coupling agents cooperates with modified carbon black, and the imine in the coupling agent captures rubber macromolecular free radicals and converts them into relatively stable adamantane free radicals, which are then more easily combined with modified carbon black; promoting the transfer of rubber macromolecular free radicals to the carbon black surface and enhancing interfacial interactions.

[0036] 3. According to the low-noise and low-rolling resistance tire tread for new energy vehicles of the present application, the present application uses tea polyphenols to modify carbon black. On the one hand, tea polyphenols are adsorbed in the pores of carbon black, the large pore size of carbon black is reduced, and the proportion of small pores is increased, which is conducive to improving the dispersibility of carbon black and can reduce hysteresis loss and dynamic energy loss; on the other hand, the ortho-phenolic hydroxyl groups of tea polyphenols are easily oxidized to ortho-quinone groups, which can react with sulfur-containing substances to promote vulcanization. In addition, in addition to modifying carbon black, tea polyphenols produce complexation with zinc ions during the vulcanization process, which is conducive to the combination of white carbon black and rubber matrix, and a strong interface bond is formed between rubber and white carbon black to improve mechanical properties.

[0037] 4. According to the low-noise and low rolling resistance tire tread for new energy vehicles of this application, this application defines the pattern structure of the tire tread. By setting 4 longitudinal main grooves and central continuous transverse grooves, the drainage performance is greatly improved, and the braking and handling performance of the tire on slippery roads is enhanced. By setting sound-absorbing patterns, the noise generated by the resonance of the tire pattern blocks is effectively reduced; the shoulder is designed asymmetrically to prevent excessive tilting during sharp and high-speed steering and enhance steering response.

[0038] 5. According to the preparation method of the low-noise and low rolling resistance tire tread for new energy vehicles of the present application, the operation is simple, the practicability is strong, and it is easy to promote. By controlling the mixing order, mixing time and discharge temperature of each raw material, not only can the tread rubber composition be fully mixed in the internal mixer to ensure that it has good fluidity and plasticity, which is beneficial to the subsequent molding process, but also ensure the uniform distribution of each raw material in the tread rubber composition, thereby improving the performance consistency and stability of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0040] Figure 1 This is a schematic diagram of the front view structure of the low-noise and low rolling resistance tire tread for new energy vehicles involved in an embodiment of the present application.

[0041] Reference numerals:

[0042] 1. The first longitudinal main groove; 2. The second longitudinal main groove; 3. The third longitudinal main groove; 4. The fourth longitudinal main groove; 5. The central continuous transverse groove; 6. The first shoulder pattern; 7. The second shoulder pattern; 8. The sound absorption pattern. DETAILED DESCRIPTION

[0043] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0044] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in a conventional manner in the art or in accordance with the product instructions. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention. The preferred implementation methods and materials described in this patent are for demonstration purposes only.

[0045] Example 1 Preparation method of low noise and low rolling resistance tire tread for new energy vehicles

[0046] (1) 36 parts of natural rubber, 18 parts of butadiene rubber, 10 parts of modified carbon black and 1 part of coupling agent were added into an internal mixer and mixed for 30 seconds at a discharge temperature of 130° C. to obtain a first masterbatch;

[0047] (2) adding 36 parts of epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 10, 15 parts of white carbon black, 2 parts of stearic acid, 5 parts of zinc oxide, 5 parts of naphthenic oil and 0.5 parts of antioxidant 2,2,4-trimethyl-1,2-dihydroquinoline polymer to an internal mixer, mixing for 50 seconds, and setting the discharge temperature at 110° C. to obtain a second masterbatch;

[0048] (3) 2 parts of sulfur and 0.2 parts of accelerator NS were added to an internal mixer for vulcanization. The vulcanization time was 60 seconds and the debonding temperature was 90° C., thereby obtaining a low-noise and low-rolling-resistance tire tread for new energy vehicles.

[0049] The preparation method of modified carbon black includes the following steps: adding tea polyphenols to a 5% carbon black solution, mixing by ultrasonic and then heating and stirring to obtain modified carbon black; the mass ratio of carbon black to tea polyphenols is 1:0.05.

[0050] The preparation method of the coupling agent comprises the following steps:

[0051] (1) 1,6-hexanediamine and 2-adamantanone are dissolved in toluene, and p-toluenesulfonic acid is added. The molar ratio of 1,6-hexanediamine to 2-adamantanone is 1:2; the molar ratio of 1,6-hexanediamine to p-toluenesulfonic acid is 1:0.1. The mixture is heated under reflux to remove water generated in the reaction until no more excess water is generated and the reaction is terminated.

[0052] (2) The reaction solution was washed twice with a saturated sodium chloride solution, and then the organic layer was separated. Anhydrous sodium sulfate was added to remove water, and then the solvent was removed by rotary evaporation and dried to obtain a final brown oily product, which was the coupling agent.

[0053] Example 2 Preparation method of low noise and low rolling resistance tire tread for new energy vehicles

[0054] (1) 37.5 parts of natural rubber, 37.5 parts of butadiene rubber, 15 parts of modified carbon black and 3 parts of coupling agent were added into an internal mixer and mixed for 50 seconds at a discharge temperature of 150° C. to obtain a first masterbatch;

[0055] (2) adding 75 parts of epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 15, 25 parts of white carbon black, 5 parts of stearic acid, 10 parts of zinc oxide, 15 parts of aromatic oil and 3 parts of antioxidant N-phenyl-α-aniline into an internal mixer, mixing for 250 seconds, and setting the discharge temperature at 120° C. to obtain a second masterbatch;

[0056] (3) 8 parts of sulfur and 2 parts of accelerator DPG were added to an internal mixer for vulcanization. The vulcanization time was 80 seconds and the rubber removal temperature was 105° C., thereby obtaining a low-noise and low-rolling resistance tire tread for new energy vehicles.

[0057] The preparation method of modified carbon black includes the following steps: adding tea polyphenols to a 10% carbon black solution, ultrasonically mixing, and then heating and stirring to obtain modified carbon black; the mass ratio of carbon black to tea polyphenols is 1:0.1.

[0058] The preparation method of the coupling agent comprises the following steps:

[0059] (1) 1,6-hexanediamine and 2-adamantanone are dissolved in toluene, and p-toluenesulfonic acid is added. The molar ratio of 1,6-hexanediamine to 2-adamantanone is 1:3; the molar ratio of 1,6-hexanediamine to p-toluenesulfonic acid is 1:0.15. The mixture is heated under reflux to remove water generated in the reaction until no more excess water is generated and the reaction is terminated.

[0060] (2) The reaction solution was washed twice with a saturated sodium chloride solution, and then the organic layer was separated. Anhydrous sodium sulfate was added to remove water, and then the solvent was removed by rotary evaporation and dried to obtain a final brown oily product, which was the coupling agent.

[0061] Example 3 Preparation method of low noise and low rolling resistance tire tread for new energy vehicles

[0062] (1) 50 parts of natural rubber, 25 parts of butadiene rubber, 12 parts of modified carbon black and 2 parts of coupling agent were added into an internal mixer and mixed for 40 seconds at a discharge temperature of 140° C. to obtain a first masterbatch;

[0063] (2) adding 75 parts of epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 15, 20 parts of white carbon black, 3 parts of stearic acid, 8 parts of zinc oxide, 10 parts of aromatic oil and 1 part of antioxidant N-phenyl-α-aniline into an internal mixer, mixing for 150 seconds, and setting the discharge temperature at 110° C. to obtain a second masterbatch;

[0064] (3) 5 parts of sulfur and 1 part of accelerator CZ were added to an internal mixer for vulcanization. The vulcanization time was 80 seconds and the debonding temperature was 100° C., thereby obtaining a low-noise and low-rolling-resistance tire tread for new energy vehicles.

[0065] The preparation method of modified carbon black includes the following steps: adding tea polyphenols to a 5% carbon black solution, ultrasonically mixing, and then heating and stirring to obtain modified carbon black; the mass ratio of carbon black to tea polyphenols is 1:0.1.

[0066] The preparation method of the coupling agent comprises the following steps:

[0067] (1) 1,6-hexanediamine and 2-adamantanone are dissolved in toluene, and p-toluenesulfonic acid is added. The molar ratio of 1,6-hexanediamine to 2-adamantanone is 1:2.5; the molar ratio of 1,6-hexanediamine to p-toluenesulfonic acid is 1:0.15. The mixture is heated under reflux to remove water generated in the reaction until no more excess water is generated and the reaction is terminated.

[0068] (2) The reaction solution was washed twice with a saturated sodium chloride solution, and then the organic layer was separated. Anhydrous sodium sulfate was added to remove water, and then the solvent was removed by rotary evaporation and dried to obtain a final brown oily product, which was the coupling agent.

[0069] Example 4

[0070] The difference between Example 4 and Example 3 is that the coupling agent is silane coupling agent Si-69, and the rest are the same.

[0071] Example 5

[0072] The difference between Example 5 and Example 3 is that the mass ratio of natural rubber, cis-1,4-butadiene rubber and epoxidized solution-polymerized styrene-butadiene rubber is 1:2:1, and the rest are the same.

[0073] Example 6

[0074] The difference between Example 6 and Example 3 is that the epoxidation degree of the epoxidized solution-polymerized styrene-butadiene rubber is 30, and the rest are the same.

[0075] Example 7

[0076] The difference between Example 7 and Example 3 is that the preparation method of modified carbon black includes the following steps: adding tea polyphenols to a 5% carbon black solution, ultrasonically mixing and then heating and stirring to obtain modified carbon black; the mass ratio of carbon black to tea polyphenols is 1:1, and the rest are the same.

[0077] Example 8

[0078] The difference between Example 8 and Example 3 is that the preparation method of the coupling agent comprises the following steps:

[0079] (1) 1,6-hexanediamine and 2-adamantanone are dissolved in toluene, and p-toluenesulfonic acid is added. The molar ratio of 1,6-hexanediamine to 2-adamantanone is 1:1; the molar ratio of 1,6-hexanediamine to p-toluenesulfonic acid is 1:0.5. The mixture is heated under reflux to remove water generated in the reaction until no more excess water is generated and the reaction is terminated.

[0080] (2) The reaction solution was washed twice with a saturated sodium chloride solution, and the organic layer was separated. Anhydrous sodium sulfate was added to remove water, and then the solvent was removed by rotary evaporation and dried to obtain a coupling agent. The rest of the reaction was the same.

[0081] Example 9

[0082] The difference between Example 9 and Example 3 is that (1) 50 parts of natural rubber, 25 parts of butadiene rubber, 12 parts of modified carbon black, 2 parts of coupling agent, 75 parts of epoxidized solution-polymerized styrene-butadiene rubber with an epoxidation degree of 15, 20 parts of white carbon black, 3 parts of stearic acid, 8 parts of zinc oxide, 10 parts of aromatic oil and 1 part of antioxidant N-phenyl-α-aniline are added to an internal mixer and mixed for 40 seconds at a discharge temperature of 140° C. to obtain a first masterbatch;

[0083] (2) 5 parts of sulfur and 1 part of accelerator CZ were added to an internal mixer for vulcanization. The vulcanization time was 80 seconds and the debonding temperature was 100° C., thereby obtaining a low-noise and low-rolling-resistance tire tread for new energy vehicles.

[0084] Comparative Example 1

[0085] The difference between Comparative Example 1 and Example 3 is that the rubber is epoxidized solution-polymerized styrene-butadiene rubber, and the rest are the same.

[0086] Comparative Example 2

[0087] The difference between Comparative Example 2 and Example 3 is that the epoxidized solution-polymerized styrene-butadiene rubber is not included, and the rest are the same.

[0088] Comparative Example 3

[0089] The difference between Comparative Example 3 and Example 3 is that carbon black is used to replace modified carbon black, and the rest are the same.

[0090] Experimental Example 1

[0091] The low noise and low rolling resistance tire tread materials for new energy vehicles obtained in Examples 1 to 9 and Comparative Examples 1 to 3 were subjected to performance tests, and hardness, tensile properties and Akron wear were tested according to GB / T531.1-2008, GB / T 528-2009 and GB / T1689-2014 respectively; the rolling resistance was tested by RPA, expressed as tanδ value at 60°C, frequency of 10 Hz, and strain of 7%;

[0092] The treads prepared in Examples 1-9 and Comparative Examples 1-3 were processed by the same process to obtain finished tires, and the tires prepared were tested according to GB / T32789 1016 "Tire Noise Test Method Drum Method". The results are shown in Table 1:

[0093] Table 1 Performance test results

[0094]

[0095] The above is only the embodiment of the present application, and the protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.

Claims

1. A low-noise and low-rolling-resistance tire tread for new energy vehicles, characterized in that: The invention comprises the following components in parts by weight: 90-150 parts of rubber, 10-15 parts of modified carbon black, 15-25 parts of white carbon black, 1-3 parts of coupling agent, 2-5 parts of stearic acid, 5-10 parts of zinc oxide, 0.5-3 parts of antioxidant, 2-8 parts of sulfur, 0.2-2 parts of accelerator and 5-15 parts of filler oil; the rubber comprises natural rubber, butadiene rubber and epoxidized solution polymerized styrene-butadiene rubber; the mass ratio of the natural rubber, butadiene rubber and epoxidized solution polymerized styrene-butadiene rubber is 1:(0.5-1):(1-2); The preparation of the coupling agent comprises the following steps: (1) 1,6-hexanediamine and 2-adamantanone are dissolved in toluene, p-toluenesulfonic acid is added, and the mixture is heated under reflux to remove water generated during the reaction until no more excess water is generated and the reaction is terminated; (2) washing the reaction solution twice with a saturated sodium chloride solution, separating the organic layer, adding anhydrous sodium sulfate to remove water, and then rotary evaporating to remove the solvent, and drying to obtain the final brown oily product; The epoxidation degree of the epoxidized solution-polymerized styrene-butadiene rubber is 10-15%.

2. The low-noise and low-rolling-resistance tire tread for new energy vehicles according to claim 1, characterized in that: The modified carbon black is prepared by tea polyphenol modified carbon black. The preparation method of the modified carbon black is to add tea polyphenol into carbon black solution, mix by ultrasonication and then heat and stir to obtain the modified carbon black. The mass ratio of the carbon black to the tea polyphenol is 1:0.05-0.

1.

3. The low-noise and low rolling resistance tire tread for new energy vehicles according to claim 1, characterized in that: The molar ratio of the 1,6-hexanediamine to 2-adamantanone is 1:2-3; the molar ratio of the 1,6-hexanediamine to p-toluenesulfonic acid is 1:0.1-0.

15.

4. The low-noise and low rolling resistance tire tread for new energy vehicles according to claim 1, characterized in that: The antioxidant is one or more of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, N-phenyl-α-aniline, N-phenyl-β-naphthylamine, N-phenyl-Nˋ-cyclohexyl-p-phenylenediamine, N-phenyl-Nˋ-isopropyl-p-phenylenediamine, and N-Nˋ-diphenyl-p-phenylenediamine; the accelerator is one or more of NS, DPG, and CZ; and the filler oil is cycloparaffin oil or aromatic oil.

5. The low-noise and low-rolling-resistance tire tread for new energy vehicles according to claim 1, characterized in that: The pattern of the tire tread includes 4 longitudinal main grooves, which are the first longitudinal main groove, the second longitudinal main groove, the third longitudinal main groove and the fourth longitudinal main groove from the outside to the inside; a sound absorption pattern is provided between the first longitudinal main groove and the second longitudinal main groove, and the second longitudinal main groove and the fourth longitudinal main groove are provided with a plurality of circumferentially arranged central continuous transverse grooves, and the central continuous transverse grooves are cross-connected with the third longitudinal main groove.

6. The low-noise and low rolling resistance tire tread for new energy vehicles according to claim 5, characterized in that: The vehicle further comprises a shoulder pattern, wherein the shoulder pattern comprises a first shoulder pattern and a second shoulder pattern, wherein the first shoulder pattern is an arc-shaped fine groove, and the second shoulder pattern comprises two short fold line grooves.

7. The method for preparing a low-noise and low-rolling-resistance tire tread for a new energy vehicle according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) adding natural rubber, butadiene rubber, modified carbon black and coupling agent into an internal mixer and mixing for 30-50 seconds to obtain a first masterbatch; (2) adding epoxidized solution-polymerized styrene-butadiene rubber, white carbon black, stearic acid, zinc oxide, filler oil and antioxidant into an internal mixer, and mixing for 50-250 seconds to obtain a second masterbatch; (3) adding sulfur and an accelerator into an internal mixer for vulcanization to obtain a low-noise and low-rolling-resistance tire tread for new energy vehicles.

8. The method for preparing a low-noise and low-rolling-resistance tire tread for new energy vehicles according to claim 7, characterized in that: The debonding temperature in step (1) is 130-150°C; the debonding temperature in step (2) is 110-120°C; the vulcanization time in step (3) is 60-80s, and the debonding temperature is 90-105°C.

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