New energy truck and passenger car all-steel radial tire tread rubber and preparation method thereof

Abstract

The invention provides a new energy truck and passenger car all-steel radial tire tread rubber and a preparation method thereof, and the tread rubber comprises the following components by weight: 60-80 parts of natural rubber, 20-40 parts of butadiene rubber, 40-55 parts of carbon black, 0-15 parts of white carbon black, 0-3 parts of a silane coupling agent, 0-5 parts of a homogenizing agent, 4-8 parts of a vulcanizing activator, 1-4 parts of an anti-aging agent, and 1-2 parts of rubber protection wax. 1 to 3 parts of anti-cracking resin, 0.5 to 3 parts of sulfur, 0.5 to 3 parts of accelerant and 0 to 0.5 part of scorch retarder. According to the new energy truck and passenger car all-steel radial tire tread rubber and the preparation method thereof, the high-wear-resistance carbon black and the white carbon black are combined, so that the wear resistance of a tread formula can be balanced, and meanwhile, the rolling resistance of the tread rubber is reduced; by adding a homogenizing agent material, the heat generation of the tread rubber can be remarkably reduced, the cutting resistance of the tread rubber is improved, and the tread rubber is suitable for application scenes of all-steel radial tires of new energy trucks and passenger cars.

Description

Technical Field

[0001] This invention relates to the field of tire technology, and in particular to a tread compound for all-steel radial tires for new energy trucks and buses and its preparation method. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the electrification process in the truck and bus sector is gradually accelerating. Compared with traditional fuel trucks and buses, new energy trucks and buses (especially pure electric models) have significant differences in power output, operating conditions, and usage requirements, which poses new performance challenges to the matching all-steel radial truck tires.

[0003] The formulation of traditional all-steel radial truck tire treads is designed with "high wear resistance and high load-bearing capacity" as its core, mainly targeting the conditions of uniform speed driving and stable torque in fuel vehicles. However, when applied to new energy trucks and buses, the following key problems have been exposed: High rolling resistance affects range: New energy trucks and buses are sensitive to range. Traditional tire treads have a relatively high rolling resistance coefficient due to their reinforcement system and elastic design, which leads to increased vehicle energy consumption and reduced range.

[0004] Insufficient tear and impact resistance: The instantaneous torque of the motor in new energy trucks and buses is large, and the local load on the tire tread increases sharply during start-up and acceleration. Traditional tire tread rubber is prone to cracking and chipping.

[0005] Poor heat aging resistance: Frequent start-stop, braking, and energy recovery operations of new energy trucks and buses lead to increased heat generation from friction between the tire tread and the ground. The tire tread operating temperature is higher than that of traditional models. Traditional tire tread rubber generates more heat, which causes the tire tread rubber to harden and lose elasticity at high temperatures, further aggravating wear.

[0006] Therefore, developing a tread compound for all-steel radial truck tires that combines low rolling resistance, tear resistance, low heat generation, and high wear resistance, specifically tailored to the operating conditions of new energy trucks and buses, has become a pressing technical challenge for the industry. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a tread compound for all-steel radial tires of new energy trucks and buses and its preparation method. By combining high wear-resistant carbon black and white carbon black, the wear resistance of the tread compound can be balanced while reducing the rolling resistance of the tread compound. The addition of homogenizing agent can significantly reduce the heat generation of the tread compound and improve its cut resistance. It is suitable for the application of all-steel radial tires of new energy trucks and buses.

[0008] The technical solution adopted in this invention is: A new energy truck and bus all-steel radial tire tread compound, comprising, by weight, the following components: 60-80 parts natural rubber, 20-40 parts butadiene rubber, 40-55 parts carbon black, 0-15 parts silica, 0-3 parts silane coupling agent, 0-5 parts homogenizer, 4-8 parts vulcanizing activator, 1-4 parts antioxidant, 1-2 parts rubber protective wax, 1-3 parts anti-cracking resin, 0.5-3 parts sulfur, 0.5-3 parts accelerator, and 0-0.5 parts scorching inhibitor.

[0009] Preferably, the tread compound of the all-steel radial tires for new energy trucks and buses is wherein the butadiene rubber is nickel-based polybutadiene rubber with a cis structure content of ≥96%.

[0010] Preferably, in the tread compound of the all-steel radial tires for new energy trucks and buses, the carbon black is N234; the nitrogen adsorption specific surface area of ​​the silica is 161-190 m². 2 / g, with a silicon dioxide content ≥90%; the silane coupling agent is Si69.

[0011] Preferably, the tread compound for the all-steel radial tires of the new energy trucks and buses includes a vulcanizing activator comprising 3-5 parts zinc oxide and 1-3 parts stearic acid.

[0012] Preferably, the tread compound for the all-steel radial tires of the new energy trucks and buses includes an antioxidant comprising 0.1-2 parts antioxidant RD and 1-2 parts antioxidant 4020.

[0013] Preferably, the tread compound for the all-steel radial tires of the new energy trucks and buses includes: the accelerator is accelerator CZ; and the anti-scorching agent is anti-scorching agent CTP.

[0014] This invention also provides a method for preparing a tread compound for all-steel radial tires of new energy trucks and buses, comprising the following steps: (1) First stage mixing: Natural rubber and butadiene rubber are put into a mixer for a first stage mixing, and then carbon black, silica, silane coupling agent, vulcanizing activator, antioxidant, rubber protective wax, homogenizer and anti-cracking resin are added for a second stage mixing. The second stage mixing is carried out at 150-160℃ and the rubber is discharged. The discharged rubber is then sheeted through the rollers of the open mill to obtain the first stage masterbatch. (2) Masterbatch settling: Place the section of masterbatch obtained in step (1) in the air to cool; (3) Final mixing: After the masterbatch in step (2) has been left to stand, it is mixed on the open mill for 1-1.5 minutes. Then, anti-scorching agent, sulfur and accelerator are added. Then, it is mixed on the open mill for 1.5-2 minutes. Cut the left and right sides 2-6 times, adjust the roller gap to the minimum, make a triangular package, and finally roll it up and cut it into sheets to obtain the finished tread rubber.

[0015] Preferably, the preparation method of the tread rubber of the all-steel radial tire for new energy trucks and buses includes the following: the secondary mixing in step (1) is as follows: control the speed of the internal mixer to 60-90 rpm, mix to 100-120℃ and lift the top plug, then control the speed to 60-90 rpm, mix to 125-135℃ and lift the top plug, then control the speed to 60-90 rpm, mix to 140-150℃ and lift the top plug, then control the speed to 60-90 rpm, mix to 150-160℃ and lift the top plug, and finally control the mixing temperature to be maintained at 150-160℃ and mix for 20-40 seconds to discharge the rubber.

[0016] Preferably, in the preparation method of the tread compound for the all-steel radial tires of the new energy trucks and buses, the cooling time in step (2) is 4-8 hours.

[0017] Preferably, the method for preparing the tread rubber of the all-steel radial tires for new energy trucks and buses includes the following: in step (3), the temperature of the open mill for rubber mixing is 105-110℃, and the gap between the open mill rolls is 3.8-4.2mm.

[0018] Advantages of this invention: The present invention relates to a tread compound for all-steel radial tires for new energy trucks and buses and its preparation method. By combining high-wear-resistant carbon black and silica, the wear resistance of the tread compound can be balanced while reducing the rolling resistance of the tread compound. The addition of homogenizing agent can significantly reduce the heat generation of the tread compound and improve its cut resistance, making it suitable for the application scenarios of all-steel radial tires for new energy trucks and buses. Attached Figure Description

[0019] Figure 1 This is a comparison chart of the rolling resistance of Embodiments 1-5 and Comparative Example 1 of the present invention.

[0020] Figure 2 This is a comparison chart of the heat generation factors of Examples 1-5 and Comparative Example 1 of the present invention.

[0021] Figure 3 This is a comparison chart of the cut resistance volume ratio of Embodiments 1-5 and Comparative Example 1 of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments.

[0023] The homogenizer in the following examples and comparative examples was manufactured by Jiangsu Ruiba New Material Technology Co., Ltd., with the grade RH-100; the anti-crack resin was manufactured by Quanzhou Huashi Rubber & Plastics Technology Co., Ltd., with the grade FC-260; the cis-butadiene rubber was nickel-based polybutadiene rubber with a cis content ≥96%, manufactured by Zhejiang Chuanhua Synthetic Materials Co., Ltd., with the grade BR9000; and the nitrogen adsorption specific surface area of ​​the silica was 161-190 m². 2 / g, silica content ≥90%.

[0024] Example 1 A new energy truck and bus all-steel radial tire tread compound, by weight, comprises the following components: 70 parts natural rubber, 30 parts butadiene rubber, 45 parts N234 carbon black, 5 parts silica, 0.5 parts silane coupling agent Si69, 3.0 parts homogenizer, 3.5 parts zinc oxide, 2.0 parts stearic acid, 0.3 parts antioxidant RD, 1.3 parts antioxidant 4020, 1.0 part rubber protective wax, 1 part anti-cracking resin, 0.95 parts sulfur, 1.3 parts accelerator CZ, and 0.2 parts anti-scorching agent.

[0025] Example 2 A new energy truck and bus all-steel radial tire tread compound, by weight, comprises the following components: 70 parts natural rubber, 30 parts butadiene rubber, 45 parts N234 carbon black, 10 parts silica, 1.0 part silane coupling agent Si69, 3.0 parts homogenizer, 3.5 parts zinc oxide, 2.0 parts stearic acid, 0.3 parts antioxidant RD, 1.3 parts antioxidant 4020, 1.0 part rubber protective wax, 1 part anti-cracking resin, 0.95 parts sulfur, 1.3 parts accelerator CZ, and 0.2 parts scorching inhibitor.

[0026] Example 3 A new energy truck and bus all-steel radial tire tread compound, by weight, comprises the following components: 70 parts natural rubber, 30 parts butadiene rubber, 45 parts N234 carbon black, 15 parts silica, 1.5 parts silane coupling agent Si69, 3.0 parts homogenizer, 3.5 parts zinc oxide, 2.0 parts stearic acid, 0.3 parts antioxidant RD, 1.3 parts antioxidant 4020, 1.0 part rubber protective wax, 1 part anti-cracking resin, 0.95 parts sulfur, 1.3 parts accelerator CZ, and 0.2 parts anti-scorching agent.

[0027] Example 4 A new energy truck and bus all-steel radial tire tread compound, by weight, comprises the following components: 70 parts natural rubber, 30 parts butadiene rubber, 49.5 parts N234 carbon black, 5 parts silica, 0.5 parts silane coupling agent Si69, 3.0 parts homogenizer, 3.5 parts zinc oxide, 2.0 parts stearic acid, 0.3 parts antioxidant RD, 1.3 parts antioxidant 4020, 1.0 part rubber protective wax, 1 part anti-cracking resin, 0.95 parts sulfur, 1.3 parts accelerator CZ, and 0.2 parts anti-scorching agent.

[0028] Example 5 A new energy truck and bus all-steel radial tire tread compound, by weight, comprises the following components: 70 parts natural rubber, 30 parts butadiene rubber, 49.5 parts N234 carbon black, 5 parts silica, 0.5 parts silane coupling agent Si69, 3.5 parts zinc oxide, 2.0 parts stearic acid, 0.3 parts antioxidant RD, 1.3 parts antioxidant 4020, 1.0 part rubber protective wax, 1 part anti-cracking resin, 0.95 parts sulfur, 1.3 parts accelerator CZ, and 0.2 parts scorching inhibitor.

[0029] The preparation method of the tread compound for all-steel radial tires of new energy trucks and buses in Examples 1-5 includes the following steps: (1) First stage mixing: Natural rubber and butadiene rubber are put into the internal mixer for first mixing. The top jack pressure is 0.30 MPa, the speed is 60 rpm, and the mixing time is 30 s. Then, carbon black, silica, silane coupling agent, zinc oxide, stearic acid, antioxidant, rubber protective wax, homogenizer, and anti-cracking resin are added for second mixing. The speed is maintained at 60 rpm and the mixing time is 30 s. Then, the speed of the internal mixer is controlled at 60 rpm and the mixing is carried out to 110°C. The top jack is lifted. Then, the speed is controlled at 70 rpm and the mixing is carried out to 130°C. The top jack is lifted. Then, the speed is maintained at 70 rpm and the mixing is carried out to 145°C. The top jack is lifted. Then, the speed is maintained at 70 rpm and the mixing is carried out to 155°C. Finally, the constant temperature of 155°C is maintained and the mixing is carried out for 30 seconds to discharge the rubber. The discharged rubber is passed through the rollers of the open mill to obtain the first stage masterbatch. (2) Masterbatch settling: Place a section of the masterbatch obtained from mixing in the air to cool for 4 hours; (3) Final mixing: The masterbatch is mixed on the open mill for 1.5 minutes, then the anti-scorching agent, sulfur and accelerator are added, and then the mixture is mixed on the open mill for 2 minutes. The left and right sides are cut 3 times, the roller gap is adjusted to the minimum, the triangular package is formed, then the roll is rolled and sheeted to obtain the finished tread rubber. The rolling temperature of the open mill is 105℃, the roller gap of the open mill is 4.2mm, and the speed ratio of the front and rear rollers is 1:1.4.

[0030] Comparative Example 1 A new energy truck and bus all-steel radial tire tread compound, by weight, comprises the following components: 70 parts natural rubber, 30 parts butadiene rubber, 51.5 parts N134 carbon black, 3.5 parts zinc oxide, 2.0 parts stearic acid, 0.3 parts antioxidant RD, 1.3 parts antioxidant 4020, 1.0 part rubber protective wax, 1.0 part anti-cracking resin, 0.95 parts sulfur, 1.3 parts accelerator CZ, and 0.2 parts scorching inhibitor.

[0031] Comparative Example 2 A new energy truck and bus all-steel radial tire tread compound comprises 70 parts natural rubber, 30 parts butadiene rubber, 51.5 parts N220 carbon black, 3.5 parts zinc oxide, 2.0 parts stearic acid, 0.3 parts antioxidant RD, 1.3 parts antioxidant 4020, 1.0 part rubber protective wax, 1.0 part anti-cracking resin, 0.95 parts sulfur, 1.3 parts accelerator CZ, and 0.2 parts scorching inhibitor.

[0032] The preparation method for the comparative example is the same as that for the example.

[0033] The performance of the tread rubber compounds of the all-steel radial tires for new energy trucks and buses in Examples 1, 2, 3, 4, and 5, and Comparative Examples 1 and 2, were tested. The test results are shown in Table 1 and Table 2. Figure 1-3 As shown.

[0034] Table 1 is a comparison table of tread performance data for the examples and comparative examples. Figure 1 This is a comparison chart of the rolling resistance of Examples 1-5 and Comparative Example 1. The lower the rolling resistance value, the better the rolling resistance performance. Figure 2 This is a comparison chart of the heat generation factors of Examples 1-5 and Comparative Example 1. The lower the heat generation factor value, the better the heat generation performance. Figure 3 This is a comparison chart of the cut resistance volume ratios of Examples 1-5 and Comparative Example 1. The lower the cut resistance volume ratio, the better the cut resistance performance.

[0035] Table 1 Comparison of tread performance between the examples and comparative examples

[0036] From Table 1, the performance comparison data of tread compound and Figures 1-3It can be concluded that Comparative Example 1, which uses fine-particle-size, high-structure N134 carbon black, maintains high wear resistance, but its rolling resistance and heat generation performance are significantly poor. Comparative Example 2, which uses N220 carbon black with better cut resistance, has good cut resistance, but its heat generation and wear resistance are poor. Compared to Comparative Example 1, Examples 1-4 use a mixed filling system of N234 carbon black and silica, with the addition of a homogenizer. The heat generation performance of Examples 1-4 is improved by 12%-20%, rolling resistance by 13%-19%, and cut resistance by 5%-27%. As can be seen from Examples 1-3, the cut resistance of the examples increases linearly with the increase of silica content. As can be seen from Example 5, using a mixed filling system of N234 carbon black and silica can significantly improve rolling resistance and wear resistance while basically maintaining cut resistance. In summary, the homogenizer can be flexibly selected to be added depending on the specific scenario where new energy truck and bus tires emphasize cut resistance or wear resistance.

[0037] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A tread compound for all-steel radial tires of new energy trucks and buses, characterized in that, By weight, it includes the following components: 60-80 parts natural rubber, 20-40 parts butadiene rubber, 40-55 parts carbon black, 0-15 parts silica, 0-3 parts silane coupling agent, 0-5 parts homogenizer, 4-8 parts vulcanizing activator, 1-4 parts antioxidant, 1-2 parts rubber protective wax, 1-3 parts anti-cracking resin, 0.5-3 parts sulfur, 0.5-3 parts accelerator, and 0-0.5 parts scorching inhibitor.

2. The tread compound for all-steel radial tires of new energy trucks and buses according to claim 1, characterized in that: The cis-butadiene rubber is a nickel-based polybutadiene rubber with a cis structure content of ≥96%.

3. The tread compound for all-steel radial tires of new energy trucks and buses according to claim 1, characterized in that: The carbon black is N234; the nitrogen adsorption specific surface area of ​​the silica is 161-190 m². 2 / g, with a silicon dioxide content ≥90%; the silane coupling agent is Si69.

4. The tread compound for all-steel radial tires of new energy trucks and buses according to claim 1, characterized in that: The vulcanizing activator comprises 3-5 parts zinc oxide and 1-3 parts stearic acid.

5. The tread compound for all-steel radial tires of new energy trucks and buses according to claim 1, characterized in that: The antioxidant comprises 0.1-2 parts of antioxidant RD and 1-2 parts of antioxidant 4020.

6. The tread compound for all-steel radial tires of new energy trucks and buses according to claim 1, characterized in that: The accelerator is accelerator CZ; the scorching inhibitor is scorching inhibitor CTP.

7. A method for preparing a tread compound for all-steel radial tires of new energy trucks and buses according to any one of claims 1-6, characterized in that: Includes the following steps: (1) First stage mixing: Natural rubber and butadiene rubber are put into a mixer for a first stage mixing, and then carbon black, silica, silane coupling agent, vulcanizing activator, antioxidant, rubber protective wax, homogenizer and anti-cracking resin are added for a second stage mixing. The second stage mixing is carried out at 150-160℃ and the rubber is discharged. The discharged rubber is then sheeted through the rollers of the open mill to obtain the first stage masterbatch. (2) Masterbatch settling: Place the section of masterbatch obtained in step (1) in the air to cool; (3) Final mixing: After the masterbatch in step (2) has been left to stand, it is mixed on the open mill for 1-1.5 minutes. Then, anti-scorching agent, sulfur and accelerator are added. Then, it is mixed on the open mill for 1.5-2 minutes. Cut the left and right sides 2-6 times, adjust the roller gap to the minimum, make a triangular package, and finally roll it up and cut it into sheets to obtain the finished tread rubber.

8. The method for preparing the tread compound for all-steel radial tires of new energy trucks and buses according to claim 7, characterized in that: The secondary mixing in step (1) is as follows: control the speed of the internal mixer at 60-90 rpm, mix to 100-120℃ and lift the top bolt, then control the speed at 60-90 rpm, mix to 125-135℃ and lift the top bolt, then control the speed at 60-90 rpm, mix to 140-150℃ and lift the top bolt, then control the speed at 60-90 rpm, mix to 150-160℃ and lift the top bolt, and finally control the mixing temperature to be maintained at 150-160℃ and mix for 20-40 seconds to remove the glue.

9. The method for preparing the tread compound for all-steel radial tires of new energy trucks and buses according to claim 7, characterized in that: The cooling time in step (2) is 4-8 hours.

10. The method for preparing the tread compound for all-steel radial tires of new energy trucks and buses according to claim 7, characterized in that: In step (3), the temperature of the rubber being processed by the open mill is 105-110℃ and the gap between the open mill rolls is 3.8-4.2mm.

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