Low-rolling-resistance tread rubber and internal mixer rubber mixing method thereof
By controlling the speed, time, temperature and pressure during the glue refining process of the dense mixer, the problem of bubbles and rolling resistance of the low-rolling resistance of the tread glue not meeting the standards during the glue refining process is solved, and the low-rolling resistance performance of the tread glue is achieved, meeting the environmental protection standards of the EU and the United States.
Patent Information
- Application Number
- CN202510744615.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2025-08-08
AI Technical Summary
The existing low-rolling resistance tread formulations are prone to problems such as bubbles after vulcanization, fluctuations in the pressure-out size and weight and rolling resistance not meeting the standards during the glue refining process. Especially in formulas using white carbon black and silane coupling agents, special glue refining processes need to be developed to ensure processing performance and rolling resistance performance.
A specific glue refining method is adopted, including master and final refining steps. By controlling the rotation speed, press-tube mixing time, temperature and pressure, the full coupling of white carbon black and silane coupling agent is ensured, and the corrosion of ethanol gas is avoided, so as to achieve uniform dispersion of the glue and effective silanization reaction are achieved.
The production of low-roll resistance tread glue is achieved, ensuring the low-roll resistance performance of tread glue after use, meeting the energy-saving and emission reduction standards of the EU and the United States, and avoiding fluctuations in bubbles and pressure-out size and weight after vulcanization.
Smart Images
Figure SMS_1 
Figure SMS_2 
Figure SMS_3
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tire tread rubber, and specifically discloses a low rolling resistance tread rubber and an internal mixer rubber mixing method thereof. Background Art
[0002] The EU has implemented a carbon dioxide emission limit of 95 grams per 100 kilometers for passenger cars since 2020. The United States and other regions have also gradually tightened emission regulations, requiring automakers to adopt low rolling resistance tires to achieve energy conservation and emission reduction goals. In order to meet the increasingly stringent standards of the EU and the United States, low rolling resistance tread formulas have been designed and developed. Currently, low rolling resistance formulas are mainly achieved by adding white carbon black. For such formulas, conventional rubber refining methods are prone to problems such as bubbles in the rubber after vulcanization, fluctuations in extruded size and weight, extruded bubbles, and substandard rolling resistance. It is necessary to develop a special rubber refining process to ensure that white carbon black and silane coupling agents are fully coupled to ensure processing and rolling resistance and wear performance. Summary of the Invention
[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a low rolling resistance tread rubber and a rubber mixing method thereof.
[0004] According to the technical solution provided by the present invention, the low rolling resistance tread rubber includes the following components in parts by weight: 30-100 parts by weight of natural rubber, 0-35 parts by weight of butadiene rubber, 0-35 parts by weight of smoked rubber, 10-30 parts by weight of white carbon black, 25-40 parts by weight of carbon black, 3-5 parts by weight of zinc oxide, 2-2.5 parts by weight of stearic acid, 1-1.5 parts by weight of antioxidant RD, 1-2 parts by weight of antioxidant 4020, 0-1 part by weight of protective wax, 1.5-3 parts by weight of Si-69 liquid silane coupling agent, 0.2-0.3 parts by weight of anti-scorch agent CTP, 0-2.1 parts by weight of accelerator CZ, 0-1 part by weight of accelerator NS, 0.5-1.6 parts by weight of ordinary sulfur powder, 0-1.88 parts by weight of insoluble sulfur powder 7020, and 0-2 parts by weight of physical peptizer SL-5055.
[0005] Preferably, the natural rubber is STR20 natural rubber.
[0006] Preferably, the butadiene rubber is BR9000 butadiene rubber or CB22 butadiene rubber.
[0007] Preferably, the tobacco sheet glue is RSS3# tobacco sheet glue.
[0008] Preferably, the carbon black is N330 carbon black, N234 carbon black, BL201 carbon black or N134 carbon black.
[0009] Preferably, the white carbon black is 175 white carbon black or 165 white carbon black.
[0010] The low rolling resistance tread rubber internal mixer mixing method includes master mixing and final mixing; The masterbatch comprises the following steps: a1. 30-100 parts by weight of natural rubber, 0-35 parts by weight of butadiene rubber, 0-35 parts by weight of smoked rubber, 25-40 parts by weight of carbon black, 10-30 parts by weight of white carbon black, 3-5 parts by weight of zinc oxide, 2-2.5 parts by weight of stearic acid, 1-1.5 parts by weight of antioxidant RD, 1-2 parts by weight of antioxidant 4020, 0-1 part by weight of protective wax, 1.5-3 parts by weight of Si-69 liquid silane coupling agent and physical peptizer SL-5055 are mixed. 0-2 parts by weight of the carbon black and silica are added to an internal mixer, and the rubber material is mixed by pressing a top plug. The speed is controlled at 50-55 rpm, the mixing time is controlled at 20-25 seconds, the mixing temperature is controlled at 120-125°C, and the top plug pressure is controlled at 0.5-0.6 MPa. In this step, the carbon black and silica are quickly dispersed through high-speed mixing and reach the melting point of the masterbatch (including zinc oxide, stearic acid, antioxidant RD, antioxidant 4020, protective wax, Si-69 liquid silane coupling agent, and physical peptizer SL-5055). b1, lift the plug and then press the plug to mix, the speed is 40-55 rpm, the pressing and mixing time is controlled at 8-17 seconds, the mixing temperature is controlled at 135-143 ° C, and the upper push plug pressure is controlled at 0.5-0.6 MPa; this step fully disperses the molten masterbatch by lifting the plug and turning the rubber; c1. Lift the bolt and then press the bolt to mix, control the speed at 30-40 rpm, control the pressing and mixing time at 6-10 seconds, control the mixing temperature at 148-152°C, and control the upper bolt pressure at 0.4-0.5 MPa; this step makes the carbon black, white carbon black and masterbatch small medicine dispersed evenly by lifting the bolt and turning the rubber; d1. Lift the plug and then press the plug to mix, the speed is controlled at 10-14 rpm, the pressing and mixing time is controlled at 20-80 seconds, the mixing temperature is controlled at 148-152°C, and the upper push plug pressure is controlled at 0.4-0.5 MPa; this step uses a low speed to keep the mixing temperature stable at 148-152°C and allow the white carbon black and silane coupling agent to start the silanization reaction, achieving a balance between the speed increase and the cooling of the internal mixer; e1. Lift the plug and hold for 5-8 seconds to exhaust the ethanol gas generated by the silanization reaction. The rotation speed is controlled at 11-15 rpm. This step allows the ethanol gas generated by the silanization reaction to be discharged through the dust extraction system, preventing the ethanol gas from corroding the alloy layer of the internal mixer. f1. Repeat steps d1 and e1 as many times as required; g1. After the temperature reaches 154-159°C, the rubber is discharged. The speed is controlled at 15-20 rpm, the mixing time of the plug is controlled at 5-10 seconds, and the pressure of the upper plug is controlled at 0.4-0.5 MPa. The rubber mixing process is completed once to obtain a masterbatch. This step meets the discharge temperature and completes the mixing process once, generating more bound rubber and meeting the requirements of the formula wear, rolling resistance, and processing performance. The final refining comprises the following steps: a2. Add the masterbatch, 0.2-0.3 parts by weight of scorch retarder CTP, 0-2.1 parts by weight of accelerator CZ, 0-1 part by weight of accelerator NS, 0.5-1.6 parts by weight of ordinary sulfur powder, and 0-1.88 parts by weight of insoluble sulfur powder 7020 into an internal mixer, press the top plug and mix the rubber material. The speed is controlled at 25-35 rpm, the mixing time of the top plug is controlled at 10-20 seconds, and the pressure of the top plug is controlled at 0.3-0.5 MPa. In this step, the masterbatch is quickly chopped and heated to a fluid state by high-speed mixing at 25-35 rpm. b2. Lift the plug and then press the plug to mix, control the speed at 15-25 rpm, control the pressing and mixing time at 15-25 seconds, and control the upper push plug pressure at 0.5-0.7 MPa. In this step, the masterbatch and the final mixing materials (including scorch retarder CTP, accelerator CZ, accelerator NS, ordinary sulfur powder and insoluble sulfur powder) are evenly dispersed by turning the rubber by the booster plug, thereby reducing dead corner rubber materials and final mixing materials; c2, lift the plug and then press the plug to mix, the speed of this step is 15-25 rpm, the pressing plug mixing time is controlled at 17-27 seconds, and the upper push plug pressure is controlled at 0.5-0.7 MPa; this step uses the booster plug to turn the rubber so that the masterbatch and the final mixed small materials are evenly dispersed, reducing dead corner rubber materials and final mixed small materials; d2, lift the plug and then press the plug to mix, the speed of this step is 13-23 rpm, the pressing plug mixing time is controlled at 5-15 seconds, and the upper push plug pressure is controlled at 0.3-0.5 MPa; this step uses the booster plug to turn the rubber, and the temperature of this step can make the rubber fully flow in the internal mixer, and fully disperse the rubber in the dead corner with the final mixing small material; e2. When the discharge temperature reaches 103-113℃, the plug is lifted and the rubber compound is discharged, completing the final mixing process of the rubber compound. This step meets the discharge temperature and reaches the melting point of the retarder CTP, accelerator CZ and accelerator NS. The flow and dispersibility are better at the melting point, completing the mixing process.
[0011] The tread rubber obtained by the rubber refining method of the present invention has the characteristic of low rolling resistance, and the tread rubber also has the characteristic of low rolling resistance after use. DETAILED DESCRIPTION
[0012] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.
[0013] Example 1 A low rolling resistance tread rubber comprises the following components in parts by weight: 100 parts by weight of STR20 natural rubber, 10 parts by weight of 175 white carbon black, 36 parts by weight of N330 carbon black, 5 parts by weight of zinc oxide, 2.5 parts by weight of stearic acid, 1 part by weight of antioxidant RD, 1 part by weight of antioxidant 4020, 1.5 parts by weight of Si-69 liquid silane coupling agent, 0.3 part by weight of scorch retarder CTP, 1 part by weight of accelerator NS, 0.5 part by weight of ordinary sulfur powder, and 1.88 parts by weight of insoluble sulfur powder 7020. This formula is used to manufacture the base rubber for guide wheels with a specification of 295 / 75R22.5. The Smartway rolling resistance requirement is ≤6.5, and the test method is based on the international standard ISO28580.
[0014] A method for mixing the low rolling resistance tread rubber with the above formula in an internal mixer, the method comprising master mixing and final mixing; The masterbatch is carried out using a BB430 internal mixer (rotor 6WI), and the masterbatch comprises the following steps: a1. Add 100 parts by weight of STR20 natural rubber, 10 parts by weight of 175 white carbon black, 36 parts by weight of N330 carbon black, 5 parts by weight of zinc oxide, 2.5 parts by weight of stearic acid, 1 part by weight of antioxidant RD, 1 part by weight of antioxidant 4020, and 1.5 parts by weight of Si-69 liquid silane coupling agent into an internal mixer, press the top plug and mix the rubber materials. The speed is controlled at 55 rpm, the mixing time of the top plug is controlled at 20 seconds, the mixing temperature is controlled at 120°C, and the pressure of the top plug is controlled at 0.6 MPa. b1. Lift the plug and then press the plug to mix, the speed is 55 rpm, the pressing and mixing time is controlled within 10 seconds, the mixing temperature is controlled at 143°C, and the upper push plug pressure is controlled at 0.6 MPa; c1. Lift the plug and then press the plug to mix, the speed is controlled at 30 rpm, the pressing and mixing time is controlled at 6 seconds, the mixing temperature is controlled at 149 ° C, and the upper push plug pressure is controlled at 0.4 MPa; d1. Lift the plug and then press the plug to mix, the speed is controlled at 14 rpm, the pressing and mixing time is controlled at 25 seconds, the mixing temperature is controlled at 149°C, and the upper push plug pressure is controlled at 0.4 MPa; e1. Lift the plug and hold for 5 seconds to discharge the ethanol gas from the silanization reaction. The speed is controlled at 14 rpm. f1. Repeat steps d1 and e1 1-2 times to complete the silanization reaction of the rubber compound; g1. After the temperature of the rubber compound reaches 159°C, the rubber compound is discharged. The speed is controlled at 20 rpm, the mixing time of the rubber compound is controlled at 5 seconds, and the pressure of the rubber compound is controlled at 0.4 MPa. The rubber compound mixing process is completed once to obtain a masterbatch. The final refining adopts F270 internal mixer (rotor TB), and the final refining includes the following steps: a2. Add masterbatch, 0.3 parts by weight of scorch retarder CTP, 1 part by weight of accelerator NS, 0.5 parts by weight of ordinary sulfur powder and 1.88 parts by weight of insoluble sulfur powder 7020 into an internal mixer, press the top plug and mix the rubber material. The speed is controlled at 30 rpm, the mixing time of the top plug is controlled at 15 seconds, and the pressure of the top plug is controlled at 0.4 MPa. b2. Lift the bolt and then press the bolt to mix, the speed is controlled at 20 rpm, the pressing and mixing time is controlled at 20 seconds, and the upper bolt pressure is controlled at 0.6 MPa; c2, lift the bolt and then press the bolt to mix, the speed of this step is 20 rpm, the pressing and mixing time is controlled at 22 seconds, and the upper bolt pressure is controlled at 0.6 MPa; d2, lift the bolt and then press the bolt to mix, the speed of this step is 18 rpm, the pressing and mixing time is controlled within 10 seconds, and the upper bolt pressure is controlled at 0.4 MPa; e2. When the discharge temperature reaches 108℃, the plug is lifted to discharge the glue, completing the final mixing process of the rubber compound.
[0015] The rubber compound obtained in step e2 of Example 1 was vulcanized at 151° C. for 40 min to obtain a vulcanized sample. The following tests were performed. The results are shown in Table 1.
[0016] Table 1
[0017] As can be seen from Table 1, the tanD 60° C. value of the tread rubber obtained in Example 1 is 0.039, which meets the requirement of low rolling resistance.
[0018] The SMARTWAY rolling resistance of the tread rubber obtained in Example 1 was measured to be 5.4, which met the requirements. The test standard method was based on the international standard ISO 28580.
[0019] Example 2 A low rolling resistance tread rubber comprises the following components in parts by weight: 30 parts by weight of STR20 natural rubber, 35 parts by weight of BR9000 butadiene rubber, 35 parts by weight of RSS3# smoked sheet rubber, 17 parts by weight of 175 silica, 40 parts by weight of N134 carbon black, 3.5 parts by weight of zinc oxide, 2.5 parts by weight of stearic acid, 1 part by weight of antioxidant RD, 1.5 parts by weight of antioxidant 4020, 1 part by weight of protective wax, 1.5 parts by weight of Si-69 liquid silane coupling agent, 0.2 parts by weight of scorch retarder CTP, 1.6 parts by weight of accelerator CZ, 1.2 parts by weight of ordinary sulfur powder, and 2 parts by weight of physical peptizer SL-5055. This formula is used to manufacture 295 / 75R22.5 specification steerable tire treads. The Smartway rolling resistance requirement is ≤6.5, and the test method conforms to the international standard ISO 28580.
[0020] A method for mixing the low rolling resistance tread rubber with the above formula in an internal mixer, the method comprising master mixing and final mixing; The masterbatch is carried out using a BB430 internal mixer (rotor 6WI), and the masterbatch comprises the following steps: a1. Add 30 parts by weight of STR20 natural rubber, 35 parts by weight of BR9000 butadiene rubber, 35 parts by weight of RSS3# smoked sheet rubber, 17 parts by weight of 175 white carbon black, 40 parts by weight of N134 carbon black, 3.5 parts by weight of zinc oxide, 2.5 parts by weight of stearic acid, 1 part by weight of antioxidant RD, 1.5 parts by weight of antioxidant 4020, 1 part by weight of protective wax, 1.5 parts by weight of Si-69 liquid silane coupling agent and 2 parts by weight of physical peptizer SL-5055 into an internal mixer, press the top plug to mix the rubber materials, control the speed at 50 rpm, control the mixing time of the top plug at 25 seconds, control the mixing temperature at 120°C, and control the pressure of the top plug at 0.5 MPa; b1. Lift the plug and then press the plug to mix, the speed is 40 rpm, the pressing and mixing time is controlled at 17 seconds, the mixing temperature is controlled at 135℃, and the upper push plug pressure is controlled at 0.5Mpa; c1. Lift the plug and then press the plug to mix, the speed is controlled at 30 rpm, the pressing and mixing time is controlled at 8 seconds, the mixing temperature is controlled at 152°C, and the upper push plug pressure is controlled at 0.4 MPa; d1. Lift the plug and then press the plug to mix, the speed is controlled at 11 rpm, the pressing and mixing time is controlled at 20 seconds, the mixing temperature is controlled at 152℃, and the upper push plug pressure is controlled at 0.4Mpa; e1. Lift the plug and hold for 6 seconds to discharge the ethanol gas from the silanization reaction. The speed is controlled at 11 rpm. f1. Repeat steps d1 and e1 1-2 times to complete the silanization reaction of the rubber compound; g1. After the temperature of the rubber compound reaches 156°C, the rubber compound is discharged. The speed is controlled at 15 rpm, the mixing time of the rubber compound is controlled at 5 seconds, and the pressure of the rubber compound is controlled at 0.4 MPa. The rubber compound mixing process is completed once to obtain a masterbatch. The final refining comprises the following steps: a2. Add the masterbatch, 0.2 parts by weight of scorch retarder CTP, 1.6 parts by weight of accelerator CZ and 1.2 parts by weight of ordinary sulfur powder into an internal mixer, press the top plug and mix the rubber material. The speed is controlled at 25 rpm, the mixing time of the top plug is controlled at 20 seconds, and the pressure of the top plug is controlled at 0.3 MPa. b2. Lift the bolt and then press the bolt to mix, the speed is controlled at 25 rpm, the pressing and mixing time is controlled at 15 seconds, and the upper bolt pressure is controlled at 0.7 MPa; c2, lift the bolt and then press the bolt to mix, the speed of this step is 15 rpm, the pressing and mixing time is controlled at 27 seconds, and the upper bolt pressure is controlled at 0.5 MPa; d2, lift the bolt and then press the bolt to mix, the speed of this step is 23 rpm, the pressing and mixing time is controlled within 5 seconds, and the upper bolt pressure is controlled at 0.5 MPa; e2. When the discharge temperature reaches 103℃, the plug is lifted to discharge the glue, completing the final mixing process of the rubber compound.
[0021] The rubber compound obtained in step e2 of Example 2 was vulcanized at 151° C. for 40 min to obtain a vulcanized sample. The following tests were performed. The results are shown in Table 2.
[0022] Table 2
[0023] As can be seen from Table 2, the tanD 60° C. value of the tread rubber obtained in Example 2 is 0.081, which meets the requirement of low rolling resistance.
[0024] The SMARTWAY rolling resistance of the tread rubber obtained in Example 2 was measured to be 5.4, which met the requirements. The test standard method was based on the international standard ISO 28580.
[0025] Example 3 A low rolling resistance tread rubber comprises the following components in parts by weight: 100 parts by weight of STR20 natural rubber, 30 parts by weight of 165 white carbon black, 25 parts by weight of N234 carbon black, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 1.5 parts by weight of antioxidant RD, 2 parts by weight of antioxidant 4020, 1 part by weight of protective wax, 3 parts by weight of Si-69 liquid silane coupling agent, 0.2 parts by weight of anti-scorch agent CTP, 2.1 parts by weight of accelerator CZ, and 1.6 parts by weight of ordinary sulfur powder. This formula is used to manufacture 295 / 75R22.5 drive wheels. The Smartway rolling resistance requirement is ≤6.6, and the test method is based on the international standard ISO28580.
[0026] A method for mixing the low rolling resistance tread rubber with the above formula in an internal mixer, the method comprising master mixing and final mixing; The masterbatch is carried out using a BB430 internal mixer (rotor 6WI), and the masterbatch comprises the following steps: a1. Add 100 parts by weight of STR20 natural rubber, 30 parts by weight of 165 white carbon black, 25 parts by weight of N234 carbon black, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 1.5 parts by weight of antioxidant RD, 2 parts by weight of antioxidant 4020, 1 part by weight of protective wax, and 3 parts by weight of Si-69 liquid silane coupling agent into an internal mixer, press the top plug and mix the rubber materials. The speed is controlled at 55 rpm, the mixing time of the top plug is controlled at 23 seconds, the mixing temperature is controlled at 125°C, and the pressure of the top plug is controlled at 0.5 MPa. b1. Lift the plug and then press the plug to mix, the speed is 40 rpm, the pressing and mixing time is controlled at 8 seconds, the mixing temperature is controlled at 135℃, and the upper push plug pressure is controlled at 0.5Mpa; c1. Lift the plug and then press the plug to mix, the speed is controlled at 40 rpm, the pressing and mixing time is controlled at 10 seconds, the mixing temperature is controlled at 148 ° C, and the upper push plug pressure is controlled at 0.5 MPa; d1. Lift the plug and then press the plug to mix, the speed is controlled at 10 rpm, the pressing and mixing time is controlled at 80 seconds, the mixing temperature is controlled at 148℃, and the upper push plug pressure is controlled at 0.5Mpa; e1. Lift the plug and hold for 8 seconds to discharge the ethanol gas from the silanization reaction. The speed is controlled at 15 rpm. f1. Repeat steps d1 and e1 1-2 times to complete the silanization reaction of the rubber compound; g1. After the temperature of the rubber compound reaches 154°C, the rubber compound is discharged. The speed is controlled at 15 rpm, the mixing time of the rubber compound is controlled at 10 seconds, and the pressure of the rubber compound is controlled at 0.5 MPa. The rubber compound mixing process is completed once to obtain a masterbatch. The final refining comprises the following steps: a2. Add masterbatch, 0.2 parts by weight of scorch retarder CTP, 2.1 parts by weight of accelerator CZ and 1.6 parts by weight of ordinary sulfur powder into an internal mixer, press the top plug and mix the rubber material. The speed is controlled at 35 rpm, the mixing time of the top plug is controlled at 10 seconds, and the pressure of the top plug is controlled at 0.5 MPa. b2. Lift the bolt and then press the bolt to mix, the speed is controlled at 15 rpm, the pressing and mixing time is controlled at 25 seconds, and the upper bolt pressure is controlled at 0.5 MPa; c2, lift the bolt and then press the bolt to mix, the speed of this step is 25 rpm, the pressing and mixing time is controlled at 17 seconds, and the upper bolt pressure is controlled at 0.7 MPa; d2, lift the bolt and then press the bolt to mix, the speed of this step is 13 rpm, the pressing and mixing time is controlled at 15 seconds, and the upper bolt pressure is controlled at 0.3 MPa; e2. When the discharge temperature reaches 113℃, the plug is lifted to discharge the glue, completing the final mixing process of the rubber compound.
[0027] The rubber compound obtained in step e2 of Example 3 was vulcanized at 151° C. for 40 min to obtain a vulcanized sample. The following tests were performed. The results are shown in Table 3.
[0028] Table 3
[0029] As can be seen from Table 3, the tanD 60° C. value of the tread rubber obtained in Example 3 is 0.075, which meets the requirement of low rolling resistance.
[0030] The measured SMARTWAY rolling resistance value of the tread rubber obtained in Example 3 is 6.1, which meets the requirements. The test standard method is the international standard ISO28580.
[0031] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.
Claims
1. A low rolling resistance tread rubber, characterized by: The invention comprises the following components in parts by weight: 30-100 parts by weight of natural rubber, 0-35 parts by weight of butadiene rubber, 0-35 parts by weight of smoked rubber, 10-30 parts by weight of white carbon black, 25-40 parts by weight of carbon black, 3-5 parts by weight of zinc oxide, 2-2.5 parts by weight of stearic acid, 1-1.5 parts by weight of antioxidant RD, 1-2 parts by weight of antioxidant 4020, 0-1 part by weight of protective wax, 1.5-3 parts by weight of Si-69 liquid silane coupling agent, 0.2-0.3 parts by weight of anti-scorch agent CTP, 0-2.1 parts by weight of accelerator CZ, 0-1 part by weight of accelerator NS, 0.5-1.6 parts by weight of common sulfur powder, 0-1.88 parts by weight of insoluble sulfur powder 7020, and 0-2 parts by weight of physical peptizer SL-5055.
2. The low rolling resistance tread rubber according to claim 1, wherein: The natural rubber is STR20 natural rubber.
3. The low rolling resistance tread rubber according to claim 1, wherein: The butadiene rubber is BR9000 butadiene rubber or CB22 butadiene rubber.
4. The low rolling resistance tread rubber according to claim 1, wherein: The cigarette sheet glue adopts RSS3# cigarette sheet glue.
5. The low rolling resistance tread rubber according to claim 1, wherein: The carbon black is N330 carbon black, N234 carbon black, BL201 carbon black or N134 carbon black.
6. The low rolling resistance tread rubber according to claim 1, wherein: The white carbon black is 175 white carbon black or 165 white carbon black.
7. The internal mixer method for making low rolling resistance tread rubber according to claim 1, characterized in that The method includes master refining and final refining; The masterbatch comprises the following steps: a1. Add 30-100 parts by weight of natural rubber, 0-35 parts by weight of butadiene rubber, 0-35 parts by weight of smoked rubber, 25-40 parts by weight of carbon black, 10-30 parts by weight of white carbon black, 3-5 parts by weight of zinc oxide, 2-2.5 parts by weight of stearic acid, 1-1.5 parts by weight of antioxidant RD, 1-2 parts by weight of antioxidant 4020, 0-1 part by weight of protective wax, 1.5-3 parts by weight of Si-69 liquid silane coupling agent and 0-2 parts by weight of physical peptizer SL-5055 into an internal mixer, press on the top plug to mix the rubber material, control the speed at 50-55 rpm, control the mixing time of the top plug at 20-25 seconds, control the mixing temperature at 120-125° C., and control the pressure of the top plug at 0.5-0.6 MPa. b1. Lift the plug and then press the plug to mix, the speed is 40-55 rpm, the pressing and mixing time is controlled at 8-17 seconds, the mixing temperature is controlled at 135-143℃, and the upper push plug pressure is controlled at 0.5-0.6Mpa; c1. Lift the plug and then press the plug to mix, control the speed at 30-40 rpm, the pressing and mixing time at 6-10 seconds, the mixing temperature at 148-152℃, and the upper push plug pressure at 0.4-0.5Mpa; d1. Lift the plug and then press the plug to mix, the speed is controlled at 10-14 rpm, the pressing and mixing time is controlled at 20-80 seconds, the mixing temperature is controlled at 148-152℃, and the upper push plug pressure is controlled at 0.4-0.5Mpa; e1. Lift the plug and hold for 5-8 seconds to discharge the ethanol gas from the silanization reaction. The speed should be controlled at 11-15 rpm. f1. Repeat steps d1 and e1 1-2 times; g1. After the temperature of the rubber compound reaches 154-159°C, the rubber compound is discharged. The speed is controlled at 15-20 rpm, the mixing time of the rubber compound is controlled at 5-10 seconds, and the pressure of the rubber compound is controlled at 0.4-0.5 MPa. The rubber compound mixing process is completed once to obtain a masterbatch. The final refining comprises the following steps: a2. Add masterbatch, 0.2-0.3 parts by weight of scorch retarder CTP, 0-2.1 parts by weight of accelerator CZ, 0-1 parts by weight of accelerator NS, 0.5-1.6 parts by weight of ordinary sulfur powder and 0-1.88 parts by weight of insoluble sulfur powder 7020 into an internal mixer, press the top plug and mix the rubber material. The speed is controlled at 25-35 rpm, the mixing time of the top plug is controlled at 10-20 seconds, and the pressure of the top plug is controlled at 0.3-0.5 MPa. b2. Lift the bolt and then press the bolt to mix, the speed is controlled at 15-25 rpm, the pressing and mixing time is controlled at 15-25 seconds, and the upper bolt pressure is controlled at 0.5-0.7 MPa; c2, lift the bolt and then press the bolt to mix, the speed of this step is 15-25 rpm, the pressing and mixing time is controlled at 17-27 seconds, and the upper bolt pressure is controlled at 0.5-0.7 MPa; d2, lift the bolt and then press the bolt to mix, the speed of this step is 13-23 rpm, the pressing and mixing time is controlled at 5-15 seconds, and the upper bolt pressure is controlled at 0.3-0.5 MPa; e2. When the discharge temperature reaches 103-113℃, the plug is lifted to discharge the glue, completing the final mixing process of the rubber compound.