Tire tread rubber as well as preparation method and application thereof

Abstract

The invention provides tire tread rubber as well as a preparation method and application thereof. The tire tread rubber is prepared from smoke sheet rubber or natural rubber, high-abrasion-resistance carbon black, high-dispersity white carbon black, conductive carbon black, a silane coupling agent, aromatic hydrocarbon oil, an anti-aging agent, protective wax, stearic acid, zinc oxide, a dispersing agent, sulfur, an accelerant, a scorch retarder and an anti-vulcanization reducing agent. The tire tread rubber disclosed by the invention not only is green and environment-friendly and has good processability, but also has the high-performance characteristics of good wear resistance, high tear strength, low dynamic heat generation, good flex cracking resistance and cutting resistance, heat resistance, cold resistance and the like, and can prolong the service life and improve the flight safety of tires of small unmanned aircrafts.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and particularly to a tire tread rubber and its preparation method and application. Background Art

[0002] In recent years, small unmanned aerial vehicles have been widely used in multiple fields due to their advantages such as low cost, flexible operation, and strong adaptability. In the agricultural field, plant protection UAVs can efficiently spray pesticides and monitor crops, greatly improving production efficiency; in the surveying and mapping field, aerial survey UAVs can quickly obtain high-precision terrain data, providing key support for engineering construction; in the logistics industry, delivery UAVs are gradually changing the traditional distribution mode to achieve faster last-mile delivery. According to market research institutions' predictions, the small unmanned aerial vehicle market will continue to grow at a high speed in the next few years, bringing broad development space for related supporting industries.

[0003] As a core component of the landing gear system of small unmanned aerial vehicles, the performance of the tire directly affects flight safety and efficiency. During the takeoff stage, the tire needs to withstand huge impact forces and frictional forces to ensure the smooth takeoff of the aircraft; when landing, it has to quickly absorb the impact energy and buffer the collision between the airframe and the ground to prevent structural damage. In addition, good grip can ensure the handling stability of the aircraft on the runway and avoid skidding or loss of control. For example, in complex weather conditions, such as taking off and landing on a wet runway, the anti-slip performance of the tire is crucial and directly affects the success or failure of the flight mission. Therefore, developing high-performance tires is essential for improving the overall performance and reliability of small unmanned aerial vehicles.

[0004] Currently, the tire tread rubber formulations for small unmanned aerial vehicles mostly draw on traditional aviation tire or ground vehicle tire technologies, but these formulations do not fully meet the special requirements of small unmanned aerial vehicle tires. Traditional aviation tires focus on the high load and high-speed takeoff and landing requirements of large aircraft, resulting in overly thick and rigid formulation designs. However, small unmanned aerial vehicles have extremely high requirements for tire lightweighting, and overweight tires will increase energy consumption and reduce endurance. Although ground vehicle tires consider lightweighting to a certain extent, they are insufficient in performance under special aviation conditions such as shock resistance and high temperature resistance. In addition, the existing formulations also need to be improved in terms of wear resistance. Frequent takeoff and landing operations are likely to cause tire wear, shorten the service life, and increase operating costs. Therefore, developing a high-performance tire tread rubber formulation for small unmanned aerial vehicles has important practical significance. Summary of the Invention

[0005] Aiming at the technical problems described in the background art, the purpose of the present invention is to provide a tire tread rubber and its preparation method and application. This tire tread rubber is not only green and environmentally friendly with good processing performance, but also has high wear resistance, high tear strength, low dynamic heat generation, good flex cracking resistance and cut resistance, as well as high performance characteristics such as heat resistance, cold resistance, etc., and can improve the service life and flight safety of small unmanned aircraft tires.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides a tire tread rubber, which comprises the following components in parts by weight:

[0008] 100 parts of smoked sheet rubber or natural rubber, 40 - 50 parts of high abrasion furnace black, 5 - 15 parts of highly dispersible silica, 0 - 8 parts of conductive carbon black, 1 - 3 parts of silane coupling agent, 3 - 5 parts of aromatic oil, 3 - 5 parts of antioxidant, 1 - 2 parts of protective wax, 2 - 3 parts of stearic acid, 4 - 6 parts of zinc oxide, 0.5 - 2 parts of dispersant, 1.5 - 2.5 parts of sulfur, 0.8 - 1.5 parts of accelerator, 0.1 - 0.3 parts of scorch retarder, 0.5 - 1 part of anti-vulcanization reducing agent.

[0009] Preferably, the high abrasion furnace black includes at least one of N115 carbon black, N129 carbon black, N234 carbon black, and N134 carbon black.

[0010] Preferably, the highly dispersible silica includes at least one of VN3 silica, 7000GR silica, ZJ - 2115MP silica, and LKHD 1156MP silica.

[0011] Preferably, the antioxidant includes antioxidant 4020 and antioxidant RD, and the mass ratio of antioxidant 4020 to antioxidant RD is (2 - 3):(1 - 2).

[0012] Preferably, the smoked sheet rubber is No. 1 smoked sheet rubber or No. 3 smoked sheet rubber;

[0013] The number average molecular weight of the No. 1 smoked sheet rubber is 1×10 6 ~1×10 7 Daltons.

[0014] Preferably, the silane coupling agent includes Si75 and / or Si69;

[0015] The conductive carbon black is CXV72 conductive carbon black;

[0016] The dispersant includes at least one of RF - 44 and RF - 40;

[0017] The anti-vulcanization reducing agent includes at least one of WK - 901 and VIVA - 77;

[0018] The scorch retarder is CTP.

[0019] Preferably, the accelerator includes at least one of accelerator NS, accelerator CZ, and accelerator TBSI.

[0020] In a second aspect, the present invention also provides a method for preparing the tire tread rubber, comprising the following steps:

[0021] Mix smoked sheet rubber or natural rubber with 30-40% by mass of highly wear-resistant carbon black in a kneader for kneading, discharge the kneaded rubber, then enter an extruder, after screw extrusion, wrap it around the roll to form a sheet, and cool it to obtain a first-stage carbon black plastic.

[0022] Perform second-stage mixing on the first-stage carbon black plastic with the remaining highly wear-resistant carbon black, highly dispersible white carbon black, conductive carbon black, silane coupling agent, aromatic oil, antioxidant, protective wax, stearic acid, zinc oxide, and dispersant to obtain a second-stage mixed masterbatch.

[0023] Perform third-stage mixing on the second-stage mixed masterbatch with sulfur, accelerator, scorch retarder, and anti-vulcanization reducing agent to obtain the tire tread rubber.

[0024] Preferably, it includes the following steps:

[0025] Mix smoked sheet rubber with 30-40% by mass of highly wear-resistant carbon black in a kneader at a rotational speed of 40-50 rpm for kneading until the discharge temperature reaches 135-140 °C, then enter an extruder, after screw extrusion, wrap it around the roll to form a sheet, and cool it to 40-45 °C, and let it stand for 8-24 h to obtain a first-stage carbon black plastic.

[0026] Perform second-stage mixing on the first-stage carbon black plastic with the remaining highly wear-resistant carbon black, highly dispersible white carbon black, conductive carbon black, silane coupling agent, aromatic oil, antioxidant, protective wax, stearic acid, zinc oxide, and dispersant in a kneader at a rotational speed of 40-50 rpm until the discharge temperature reaches 145-150 °C to obtain a second-stage mixed masterbatch.

[0027] Perform third-stage mixing on the second-stage mixed masterbatch with sulfur, accelerator, scorch retarder, and anti-vulcanization reducing agent in a kneader at a rotational speed of 20-30 rpm until the discharge temperature reaches 110-115 °C to obtain the tire tread rubber.

[0028] In a third aspect, the present invention also provides an application of the tire tread rubber described above or the tire tread rubber prepared by the preparation method described above in the preparation of tires for small unmanned aerial vehicles.

[0029] A tire tread rubber of the present invention, its preparation method and application have the following beneficial effects compared with the existing ones:

[0030] 1. The tire tread rubber of the present invention comprises the following components: smoked sheet rubber or natural rubber, highly wear-resistant carbon black, highly dispersible silica, conductive carbon black, silane coupling agent, aromatic oil, antioxidant, protective wax, stearic acid, zinc oxide, dispersant, sulfur, accelerator, anti-scorching agent, anti-vulcanization reducing agent; the use of high-content Indonesian No. 1 smoked sheet rubber or Thai No. 3 smoked sheet rubber RSS3 greatly improves the mechanical and dynamic properties of the vulcanizate. The added highly dispersible silica and ultra-wear-resistant structured carbon black enhance the flexing crack resistance of the rubber compound while effectively reducing dynamic heat generation, enabling the tire to remain stable during high-frequency use; the ultra-wear-resistant carbon black improves the wear resistance and tear resistance of the tread rubber, extends the service life of the tire, and at the same time enhances the conductivity of the tread rubber, further reducing the resistance of the tire and improving flight safety. The selection and compounding of specific antioxidants, accelerators and plasticizers (environmentally friendly aromatic oil) further optimize the performance of the tire tread, endowing it with good anti-aging performance, vulcanization performance and processing performance. At the same time, the environmentally friendly aromatic oil as a plasticizer improves the grip between the tire tread and the ground, ensuring the stability and safety of the takeoff and landing of small unmanned aircraft; the tire tread rubber of the present invention is not only green and environmentally friendly with good processing performance, but also has high wear resistance, high tear strength, low dynamic heat generation, good flexing crack resistance and cut resistance, and high performance characteristics such as heat resistance and cold resistance, which can improve the service life and flight safety of small unmanned aircraft tires. Detailed Embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] This application provides a tire tread rubber, comprising the following components in parts by weight:

[0033] Smoked sheet rubber or natural rubber 100 parts, highly wear-resistant carbon black 40 - 50 parts, highly dispersible silica 5 - 15 parts, conductive carbon black 0 - 8 parts, silane coupling agent 1 - 3 parts, aromatic oil 3 - 5 parts, antioxidant 3 - 5 parts, protective wax 1 - 2 parts, stearic acid 2 - 3 parts, zinc oxide 4 - 6 parts, dispersant 0.5 - 2 parts, sulfur 1.5 - 2.5 parts, accelerator 0.8 - 1.5 parts, anti-scorching agent 0.1 - 0.3 parts, anti-vulcanization reducing agent 0.5 - 1 part.

[0034] In some embodiments, the highly wear-resistant carbon black includes at least one of N115 carbon black, N129 carbon black, N234 carbon black, and N134 carbon black; the carbon black N234 is CABOT N234 carbon black for rubber, the N115 carbon black is N115 carbon black of Jiangxi Black Cat Carbon Black Co., Ltd., the N134 carbon black is N134 carbon black of Jiangxi Black Cat Carbon Black Co., Ltd., and the N129 carbon black is N129 carbon black of Shandong Nester Carbon Black Co., Ltd.

[0035] In some embodiments, the highly dispersible silica includes at least one of VN3 silica, 7000GR silica, ZJ-2115MP silica, and LKHD1156MP silica; the 7000GR silica is produced by Evonik Degussa GmbH, and the VN3 silica is Degussa VN3 silica, the ZJ-2115MP silica is produced by Sanming Zhengyuan Chemical Co., Ltd. in Fujian Province, and the LKHD1156MP silica is produced by Shandong LinkSci Co., Ltd.

[0036] In some embodiments, the anti-aging agent includes anti-aging agent 4020 and anti-aging agent RD, and the mass ratio of anti-aging agent 4020 to anti-aging agent RD is (2 - 3):(1 - 2); anti-aging agent RD, also known as antioxidant RD and anti-aging agent 224, has the molecular formula C 12 H 17 N; anti-aging agent 4020, also known as anti-aging agent DMBPPD, belongs to the p-phenylenediamine type rubber anti-aging agent, and has the molecular formula C 18 H 24 N.

[0037] In some embodiments, the smoked sheet rubber is No. 1 smoked sheet rubber (i.e., Indonesian No. 1 smoked sheet rubber RSS1, i.e., RSS1# smoked sheet rubber) or No. 3 smoked sheet rubber (i.e., Thai No. 3 smoked sheet rubber RSS3), and the number-average molecular weight of the No. 1 smoked sheet rubber is 1×10 6 ~1×10 7 Daltons.

[0038] In some embodiments, the silane coupling agent includes Si75 and / or Si69. Specifically, Si75 is bis-[γ-(triethoxysilyl)propyl]-disulfide (Si75); the silane coupling agent Si-69 has the chemical name bis-[γ-(triethoxysilyl)propyl]tetrasulfide.

[0039] In some embodiments, the conductive carbon black is CXV72 conductive carbon black, i.e., Cabot VXC72 conductive carbon black.

[0040] In some embodiments, the dispersant includes at least one of RF-44 and RF-40; specifically, both RF-44 and RF-40 are produced by Jiangsu Ruiba New Material Technology Co., Ltd.; the anti-vulcanization reducing agent includes at least one of WK-901 with the chemical name of 1,3-bis(citraconimidomethyl)benzene and VIVA-77.

[0041] In some embodiments, the scorch retarder is CTP, and the scorch retarder CTP is N-cyclohexylthiophthalimide with the molecular formula C 14 H 15 O2NS.

[0042] In some embodiments, the aromatic oil is the environmentally friendly aromatic oil TADE E350 and HNAP E370, which are produced by Jiangsu Qixiang New Materials Co., Ltd.; the protective wax is microcrystalline wax and RW391 protective wax, and the RW391 protective wax is produced by Jiangsu Ruiba New Material Technology Co., Ltd.

[0043] In some embodiments, the accelerator includes at least one of accelerator NS, accelerator CZ, and accelerator TBSI; for accelerator NS, the chemical name is N-tert-butyl-2-benzothiazole sulfenamide with the molecular formula C 11 H 14 N2S2; for accelerator CZ, the chemical name is N-cyclohexyl-2-benzothiazole sulfenamide; for accelerator TBSI, the chemical name is (N-tert-butyl-bis(2-benzothiazole)sulfenimide).

[0044] Based on the same inventive concept, the present invention also provides a preparation method of the above-mentioned tire tread rubber, including the following steps:

[0045] S1. Knead the smoked sheet rubber and 30-40% by mass of highly wear-resistant carbon black in a mixer, discharge the kneaded rubber, then enter an extruder. After screw extrusion, wrap it around the roll, slice it, and cool it to obtain a first-stage carbon black plastic.

[0046] S2. Conduct a second-stage mixing of the first-stage carbon black plastic with the remaining highly wear-resistant carbon black, highly dispersible white carbon black, conductive carbon black, silane coupling agent, aromatic oil, anti-aging agent, protective wax, stearic acid, zinc oxide, and dispersant to obtain a second-stage mixed masterbatch.

[0047] S3. Conduct a third-stage mixing of the second-stage mixed masterbatch with sulfur, accelerator, scorch retarder, and anti-vulcanization reducing agent to obtain the tire tread rubber.

[0048] In some embodiments, the preparation method of the tire tread rubber includes the following steps:

[0049] S1. Mix the smoked sheet rubber with 30 - 40% by mass of high abrasion furnace black in a Banbury mixer at a rotational speed of 40 - 50 rpm. Mix until the discharge temperature reaches 135 - 140 °C, then immediately transfer it to an extruder. After screw extrusion, it is rolled into sheets, cooled to 40 - 45 °C, and stored for 8 - 24 h to obtain the first-stage carbon black plastic rubber.

[0050] S2. Mix the first-stage carbon black plastic rubber with the remaining high abrasion furnace black, highly dispersible precipitated silica, conductive carbon black, silane coupling agent, aromatic oil, antioxidant, protective wax, stearic acid, zinc oxide, and dispersant in a Banbury mixer at a rotational speed of 40 - 50 rpm for the second-stage mixing. Mix until the discharge temperature reaches 145 - 150 °C to obtain the second-stage mixed masterbatch.

[0051] S3. Mix the second-stage mixed masterbatch with sulfur, accelerator, scorch retarder, and anti-vulcanization reducing agent in a Banbury mixer at a rotational speed of 20 - 30 rpm for the third-stage mixing. Mix until the discharge temperature reaches 110 - 115 °C to obtain the tire tread rubber.

[0052] Based on the same inventive concept, the present invention also provides an application of the above-mentioned tire tread rubber or the tire tread rubber prepared by the above-mentioned preparation method in the preparation of small unmanned aircraft tires.

[0053] The tire tread rubber of the present invention is not only green and environmentally friendly with good processing performance, but also has high performance characteristics such as good abrasion resistance, high tear strength, low dynamic heat generation, good resistance to flex cracking and cutting, good heat resistance, cold resistance, all-weather aging resistance, and static electricity conductivity. It can improve the service life and flight safety of small unmanned aircraft tires.

[0054] Through the reasonable formulation of the tire tread rubber, the present invention uses high-content Indonesian No. 1 smoked sheet rubber or Thai RSS3 smoked sheet rubber, which greatly improves the mechanical and dynamic properties of the vulcanizate. The added highly dispersible precipitated silica and super abrasion furnace black enhance the flex cracking resistance of the rubber compound while effectively reducing dynamic heat generation, keeping the tire stable during high-frequency use; the super abrasion furnace black improves the abrasion resistance and tear resistance of the tire tread, extends the service life of the tire, and at the same time improves the conductivity of the tire tread, further reducing the resistance of the tire and improving flight safety. The selection and compounding of specific antioxidants, accelerators, and plasticizers (environmentally friendly aromatic oil) further optimize the performance of the tire tread, making it have good anti-aging performance, vulcanization performance, and processing performance. At the same time, the environmentally friendly aromatic oil as a plasticizer improves the grip of the tire tread on the ground, ensuring the stability and safety of the takeoff and landing of small unmanned aircraft.

[0055] The following further illustrates the tire tread rubber of the present application and its preparation method with specific embodiments. This part further describes the content of the present invention in combination with specific embodiments, but should not be construed as a limitation to the present invention. Unless otherwise specified, the technical means adopted in the embodiments are conventional means well-known to those skilled in the art. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in the art.

[0056] Example 1

[0057] This example provides a tire tread rubber, including the following components in parts by weight:

[0058] 100 parts of smoked sheet rubber, 48 parts of high abrasion furnace black, 6 parts of highly dispersible precipitated silica, 0 part of conductive carbon black, 1.2 parts of silane coupling agent, 5 parts of environmentally friendly aromatic oil, 2.5 parts of antioxidant 4020, 1.8 parts of antioxidant RD, 1.5 parts of protective wax, 2 parts of stearic acid, 4 parts of zinc oxide, 2 parts of dispersant, 1.9 parts of sulfur, 0.8 part of accelerator NS, 0.2 part of accelerator CZ, 0.2 part of scorch retarder, 0.8 part of anti-vulcanization reducing agent;

[0059] Among them, the smoked sheet rubber is Indonesian No. 1 smoked sheet rubber RSS1;

[0060] The high abrasion furnace black is N234 carbon black;

[0061] The highly dispersible precipitated silica is VN3 precipitated silica;

[0062] The silane coupling agent is Si69;

[0063] The protective wax is microcrystalline wax;

[0064] The sulfur is insoluble sulfur OT-20;

[0065] The scorch retarder is scorch retarder CTP (N-cyclohexylthiophthalimide);

[0066] The dispersant is RF-44;

[0067] The anti-vulcanization reducing agent is WK901;

[0068] The environmentally friendly aromatic oil is environmentally friendly aromatic oil TADE E350;

[0069] The preparation method of the above tire tread rubber includes the following steps:

[0070] S1. Mix the smoked sheet rubber and 30% by mass of the high abrasion furnace black in a mixer at a rotational speed of 40 rpm, mix until the discharge temperature reaches 140 °C, then immediately transfer it to an extruder. After screw extrusion, it is wrapped around the roll and sheeted, cooled to 40 °C, and stored for 24 h to obtain a first-stage carbon black plastic.

[0071] S2. Mix a section of carbon black plastic with the remaining high abrasion furnace black, highly dispersible precipitated silica, conductive carbon black, silane coupling agent, aromatic oil, anti-aging agents (anti-aging agent 4020 and anti-aging agent RD), protective wax, stearic acid, zinc oxide, and dispersant in a mixer at a rotation speed of 50 rpm for secondary mixing until the temperature reaches 150 °C, then discharge the rubber to obtain the secondary mixing masterbatch.

[0072] S3. Mix the secondary mixing masterbatch with sulfur, accelerators (accelerator NS and accelerator CZ), anti-scorching agent, and anti-vulcanization reducing agent in a mixer at a rotation speed of 30 rpm for tertiary mixing until the temperature reaches 115 °C, then discharge the rubber to obtain the tire tread rubber.

[0073] Example 2

[0074] This example provides a tire tread rubber, which is the same as that in Example 1, except that the smoked sheet rubber is Thai No. 3 smoked sheet rubber, i.e., Thai (RSS3) smoked rubber, and the rest are the same as those in Example 1.

[0075] The preparation method of the tire tread rubber in Example 2 is the same as that in Example 1, except that the smoked sheet rubber in Example 1 is replaced by Thai No. 3 smoked sheet rubber, and the rest are the same as those in Example 1.

[0076] Example 3

[0077] This example provides a tire tread rubber, which is the same as that in Example 1, except that the smoked sheet rubber in Example 1 is replaced by 20# natural rubber, and the rest are the same as those in Example 1.

[0078] The preparation method of the tire tread rubber in Example 3 is the same as that in Example 1, except that the smoked sheet rubber in Example 1 is replaced by 20# natural rubber, and the rest are the same as those in Example 1.

[0079] Comparative Example 1

[0080] The tire tread rubber provided in this comparative example is the same as that in Example 1, except that 100 parts by weight of the smoked sheet rubber in Example 1 is replaced by 80 parts by weight of 20# natural rubber and 20 parts by weight of cis-1,4-polybutadiene rubber, and the rest are the same as those in Example 1.

[0081] The preparation method of the tire tread rubber in Comparative Example 1 is the same as that in Example 1, except that 100 parts by weight of the smoked sheet rubber in Example 1 is replaced by 80 parts by weight of 20# natural rubber and 20 parts by weight of cis-1,4-polybutadiene rubber, and the rest are the same as those in Example 1.

[0082] Comparative Example 2

[0083] The tire tread rubber provided in this comparative example is the same as that in Example 1, except that 100 parts by weight of the smoked sheet rubber in Example 1 is replaced by 70 parts by weight of Thai No. 3 smoked sheet rubber and 30 parts by weight of cis-1,4-polybutadiene rubber, and the rest are the same as those in Example 1.

[0084] The preparation method of the tire tread rubber in Comparative Example 2 is the same as that in Example 1, except that 100 parts by weight of smoked sheet rubber is replaced with 70 parts by weight of Thai No. 3 smoked sheet rubber and 30 parts by weight of cis-1,4-polybutadiene rubber, and the rest are the same as those in Example 1.

[0085] Comparative Example 3

[0086] The tire tread rubber provided in this comparative example is the same as that in Example 1, except that 100 parts by weight of smoked sheet rubber in Example 1 is replaced with 80 parts by weight of Thai No. 3 smoked sheet rubber and 20 parts by weight of cis-1,4-polybutadiene rubber, and the rest are the same as those in Example 1.

[0087] The preparation method of the tire tread rubber in Comparative Example 3 is the same as that in Example 1, except that 100 parts by weight of smoked sheet rubber is replaced with 80 parts by weight of Thai No. 3 smoked sheet rubber and 20 parts by weight of cis-1,4-polybutadiene rubber, and the rest are the same as those in Example 1.

[0088] The weight parts of each raw material in the tire tread rubbers of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1 below:

[0089] Table 1 - Weight Parts of Each Raw Material in the Tire Tread Rubbers of Examples 1 to 3 and Comparative Examples 1 to 3

[0090]

[0091]

[0092] The performances of the tire tread rubbers of Examples 1 to 3 and Comparative Examples 1 to 3 are tested as shown in Table 2 below; each performance test in the following table is carried out after the tire tread rubber is vulcanized, and the vulcanization conditions are 145°C T90×120% (that is, at 145°C, the vulcanization time is set to 120% of T90 to ensure that the rubber reaches full crosslinking). The performance test methods in Tables 2, 4, 6, and 8 are the same as those in Table 2, and the tests in the table are carried out at room temperature unless otherwise specified.

[0093] Table 2 - Performances of the Tire Tread Rubbers of Examples 1 to 3 and Comparative Examples 1 to 3

[0094]

[0095] In the above embodiments, the tensile strength and elongation at break were tested in accordance with GB / T 528-2009; the tear strength was tested in accordance with GB / T 529-2009; the temperature rise in the middle part was tested in accordance with GB / T 1687.3-2016; the Akron abrasion was tested in accordance with GB / T 16-2014; the flex cracking was tested in accordance with GB / T 13934-2006; the test method for the cut resistance performance was as follows: the vulcanized tread rubber was placed under the cutter, the cutter was lifted to a height of 100 cm above the tread rubber, and the cutter cut the specimen by the impact force when it fell freely, and the depth (mm) of the cut was statistically counted.

[0096] As can be seen from the data in Table 2, when using the tire tread rubber with No. 1 smoked sheet rubber RSS1, it has higher physical and mechanical strength, higher tear strength, lower heat generation, good cut resistance performance, and comparable abrasion performance.

[0097] Example 4

[0098] This example provides a tire tread rubber, which is the same as Example 1, except that the N234 carbon black in Example 1 is replaced with N115 carbon black, and the rest are the same as in Example 1.

[0099] The preparation method of the tire tread rubber in Example 4 is the same as that in Example 1, except that the N234 carbon black in Example 1 is replaced with N115 carbon black, and the rest are the same as in Example 1.

[0100] Example 5

[0101] This example provides a tire tread rubber, which is the same as Example 1, except that the N234 carbon black in Example 1 is replaced with N129 carbon black, and the rest are the same as in Example 1.

[0102] The preparation method of the tire tread rubber in Example 5 is the same as that in Example 1, except that the N234 carbon black in Example 1 is replaced with N129 carbon black, and the rest are the same as in Example 1.

[0103] Example 6

[0104] This example provides a tire tread rubber, which is the same as Example 1, except that the N234 carbon black in Example 1 is replaced with N134 carbon black, and the rest are the same as in Example 1.

[0105] The preparation method of the tire tread rubber in Example 6 is the same as that in Example 1, except that the N234 carbon black in Example 1 is replaced with N134 carbon black, and the rest are the same as in Example 1.

[0106] The weight parts of each raw material in the tire tread rubbers in Examples 1, 4 to 6 are shown in Table 3 below:

[0107] Table 3 - Parts by weight of each raw material in the tire tread rubber of Examples 1, 4 - 6

[0108]

[0109]

[0110] The performance of the tire tread rubber in Examples 1, 4 - 6 is shown in Table 4 below

[0111] Table 4 - Performance of the tire tread rubber in Examples 1, 4 - 6

[0112]

[0113] It can be seen from the data in Table 4 that the physical and mechanical properties and wear resistance of the carbon black N134 filled compound are better than those of the carbon black N115 filled compound, carbon black N129 filled compound, and carbon black N234 filled compound; however, its processability is poor, and its heat build-up performance is higher than that of the carbon black N234 filled compound. The carbon black N234 filled compound has relatively excellent comprehensive performance.

[0114] Example 7

[0115] This example provides a tire tread rubber, which is the same as Example 1, except that 0.8 parts by weight of accelerator NS and 0.2 parts by weight of accelerator CZ in Example 1 are replaced by 1 part by weight of accelerator NS, and N234 carbon black in Example 1 is replaced by N115 carbon black, and the rest are the same as Example 1.

[0116] The preparation method of the tire tread rubber in Example 7 is the same as that in Example 1, except that 0.8 parts by weight of accelerator NS and 0.2 parts by weight of accelerator CZ in Example 1 are replaced by 1 part by weight of accelerator NS, and N234 carbon black in Example 1 is replaced by N115 carbon black, and the rest are the same as Example 1.

[0117] Example 8

[0118] This example provides a tire tread rubber, which is the same as Example 1, except that 0.8 parts by weight of accelerator NS and 0.2 parts by weight of accelerator CZ in Example 1 are replaced by 1 part by weight of accelerator CZ, and N234 carbon black in Example 1 is replaced by N115 carbon black, and the rest are the same as Example 1.

[0119] The preparation method of the tire tread rubber in Example 8 is the same as that in Example 1, except that 0.8 parts by weight of accelerator NS and 0.2 parts by weight of accelerator CZ in Example 1 are replaced by 1 part by weight of accelerator CZ, and N234 carbon black in Example 1 is replaced by N115 carbon black, and the rest are the same as Example 1.

[0120] Example 9

[0121] This embodiment provides a tire tread rubber. It is the same as Embodiment 1, except that 0.8 parts by weight of accelerator NS and 0.2 parts by weight of accelerator CZ in Embodiment 1 are replaced by 1 part by weight of accelerator TBSI, and N234 carbon black in Embodiment 1 is replaced by N115 carbon black, and the rest are the same as Embodiment 1.

[0122] The preparation method of the tire tread rubber in Embodiment 9 is the same as that in Embodiment 1, except that 0.8 parts by weight of accelerator NS and 0.2 parts by weight of accelerator CZ in Embodiment 1 are replaced by 1 part by weight of accelerator TBSI, and N234 carbon black in Embodiment 1 is replaced by N115 carbon black, and the rest are the same as Embodiment 1.

[0123] The weight parts of each raw material in the tire tread rubbers of Embodiments 1, 7 to 9 are shown in Table 5 below:

[0124] Table 5 - Weight Parts of Each Raw Material in the Tire Tread Rubbers of Embodiments 1, 7 to 9

[0125]

[0126]

[0127] The performances of the tire tread rubbers of Embodiments 1, 7 to 9 are tested as shown in Table 6 below

[0128] Table 6 - Performances of the Tire Tread Rubbers of Embodiments 7 to 9

[0129]

[0130] It can be seen from the data in Table 6 that accelerators CZ, NS and TBSI have comparable reinforcing performances for the rubber compound. Among them, accelerator NS generates less heat, and the rubber compounds of accelerator CZ and accelerator TBSI have better abrasion resistance and cut resistance.

[0131] Embodiment 10

[0132] This embodiment provides a tire tread rubber, which comprises the following components in parts by weight:

[0133] 100 parts of smoked sheet rubber, 48 parts of high abrasion furnace black, 8 parts of highly dispersible silica, 0 part of conductive carbon black, 1.6 parts of silane coupling agent, 5 parts of environmental aromatic oil, 2.5 parts of antioxidant 4020, 1.8 parts of antioxidant RD, 1.5 parts of protective wax, 2 parts of stearic acid, 4 parts of zinc oxide, 2 parts of dispersant, 1.9 parts of sulfur, 1 part of accelerator CZ, 0.2 part of scorch retarder, 0.8 part of anti-vulcanization reducing agent;

[0134] Among them, the smoked sheet rubber is Indonesian No. 1 smoked sheet rubber RSS1;

[0135] The high abrasion furnace black is N234 carbon black;

[0136] The highly-dispersed silica is VN3 silica;

[0137] The silane coupling agent is Si69;

[0138] The protective wax is microcrystalline wax;

[0139] The sulfur is insoluble sulfur OT-20;

[0140] The scorch retarder is scorch retarder CTP (N-cyclohexylthiophthalimide);

[0141] The dispersant is RF-44;

[0142] The anti-sulfuration reducing agent is WK901;

[0143] The environment-friendly aromatic oil is environment-friendly aromatic oil TADE E350;

[0144] The preparation method of the above tire tread rubber comprises the following steps:

[0145] S1. Mix the smoked sheet rubber and 30% by mass of highly wear-resistant carbon black in a mixer at a rotation speed of 40 rpm, mix until the discharge temperature reaches 140 °C, then immediately transfer it to an extruder. After screw extrusion, it is wrapped around the roll and sliced, cooled to 40 °C, and stored for 24 h to obtain a first-stage carbon black plastic;

[0146] S2. Mix the first-stage carbon black plastic with the remaining highly wear-resistant carbon black, highly-dispersed silica, conductive carbon black, silane coupling agent, aromatic oil, anti-aging agents (anti-aging agent 4020 and anti-aging agent RD), protective wax, stearic acid, zinc oxide, and dispersant in a mixer at a rotation speed of 50 rpm for secondary mixing. Mix until the discharge temperature reaches 150 °C to obtain a secondary mixing masterbatch;

[0147] S3. Mix the secondary mixing masterbatch with sulfur, accelerator (accelerator CZ), scorch retarder, and anti-sulfuration reducing agent in a mixer at a rotation speed of 30 rpm for tertiary mixing. Mix until the discharge temperature reaches 115 °C to obtain the tire tread rubber.

[0148] Example 11

[0149] The tire tread rubber provided in this example further includes 8 parts by weight of CXV72 conductive carbon black on the basis of Example 10, and the rest are the same as those in Example 1.

[0150] The preparation method of the tire tread rubber in Example 11 is the same as that in Example 10, except that 8 parts by weight of CXV72 conductive carbon black are added during preparation, and the rest are the same as those in Example 10.

[0151] The weight parts of each raw material in the tire tread rubbers of Example 10 and Example 11 are shown in Table 7 below:

[0152] Table 7 - Parts by weight of each raw material in the tire tread rubber of Example 10 and Example 11

[0153] Raw material name Example 10 Example 11 No. 1 smoked sheet rubber RSS1 100 100 N234 carbon black 48 48 CVX72 conductive carbon black 8 High-performance highly-dispersed silica 8 8 Silane coupling agent si69 1.6 1.6 Microcrystalline wax 1.5 1.5 WK901 0.8 0.8 Zinc oxide 4 4 Stearic acid 2 2 Dispersant RF-44 2 2 Antioxidant 4020 2.5 2.5 Antioxidant RD 1.8 1.8 Environmentally friendly aromatic oil 5 5 Insoluble sulfur OT-20 1.9 1.9 Accelerator CZ 1 1 Scorch retarder CTP 0.2 0.2

[0154] The performance of the tire tread rubber in Test Examples 10 and 11 is shown in Table 8 below

[0155] Table 8 - Performance of the tire tread rubber in Example 10 and Example 11

[0156]

[0157] It can be seen from the data in Table 8 that the addition of CVX72 conductive carbon black can further reduce the resistance of the rubber compound, but at the same time it also reduces the mechanical properties of the rubber compound and increases the heat generation of the rubber compound

[0158] Among the above Examples 1 to 11, the overall performance of the tire tread rubber in Example 10 is the best when comprehensively compared; further, other properties of the tire tread rubber in Example 10 are tested

[0159] Low temperature retraction performance test

[0160] The test is carried out according to the standard GB / T 7758 - 2020, and the test results are shown in Table 9 below

[0161] Table 9 - Test results of the low temperature retraction performance of the tire tread rubber in Example 10

[0162] Temperature (°C) <![CDATA[TR 10 > -55.8 <![CDATA[TR 30 > -50.3 <![CDATA[TR 50 > -45.3 <![CDATA[TR 70 > -37.3

[0163] TR 10 、TR 30 、TR 50 、TR 70 respectively represent the temperatures corresponding to retraction rates of 10%, 30%, 50%, and 70%

[0164] It can be seen from Table 9 that in extremely cold environments (such as below -55°C), the retraction rate of this tread rubber is only 10%, and the material remains rigid, which can provide better support and anti - deformation ability. This vulcanized tire tread rubber shows good gradient retraction performance in low temperature environments and can be applied in conditions suitable for extremely cold conditions

[0165] Tensile performance test at low temperature of -60°C, and the test standard is carried out according to GB / T528 - 2009. The test results are shown in Table 10 below

[0166] Table 10 - Test results of the tensile performance of the tire tread rubber in Example 10 at -60°C

[0167] Tensile strength (Mpa) Elongation at break (%) 33.76 413.13

[0168] As can be seen from Table 10, the vulcanized tire tread compound also has high mechanical properties under low-temperature conditions.

[0169] The tensile property test at 60 °C was carried out according to the test standard GB / T 528-2009. The test results are shown in Table 11 below.

[0170] Table 11 - Tensile property test results of the tire tread compound in Example 10 at 60 °C

[0171] Tensile strength (Mpa) Elongation at break (%) 26.43 772.56

[0172] The tensile property test at 90 °C was carried out according to the test standard GB / T 528-2009. The test results are shown in Table 12 below.

[0173] Table 12 - Tensile property test results of the tire tread compound in Example 10 at 90 °C

[0174] Tensile strength (Mpa) Elongation at break (%) 21.34 820.05

[0175] As can be seen from Tables 11 - 12, the vulcanized tire tread compound can also maintain high mechanical properties under high-temperature conditions.

[0176] Furthermore, the tire tread compound in Example 10 was made into a finished tire, and the antistatic performance of the finished tire was tested. The test standard is GJB 108B-1998; the measured tire resistance value is 4000 Ω, which meets the standard (≤50000 Ω).

[0177] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tire tread rubber, characterized in that, It comprises the following components in parts by weight: 100 parts of smoked sheet rubber or natural rubber, 40 - 50 parts of high abrasion furnace black, 5 - 15 parts of highly dispersible precipitated silica, 0 - 8 parts of conductive carbon black, 1 - 3 parts of silane coupling agent, 3 - 5 parts of aromatic oil, 3 - 5 parts of antioxidant, 1 - 2 parts of protective wax, 2 - 3 parts of stearic acid, 4 - 6 parts of zinc oxide, 0.5 - 2 parts of dispersant, 1.5 - 2.5 parts of sulfur, 0.8 - 1.5 parts of accelerator, 0.1 - 0.3 parts of scorch retarder, 0.5 - 1 part of anti - vulcanization reducing agent.

2. The tread rubber according to claim 1, characterized in that, The high abrasion furnace black includes at least one of N115 carbon black, N129 carbon black, N234 carbon black, and N134 carbon black.

3. The tread rubber according to claim 1, characterized in that, The highly dispersible precipitated silica includes at least one of VN3 precipitated silica, 7000GR precipitated silica, ZJ - 2115MP precipitated silica, and LKHD 1156MP precipitated silica.

4. The tread compound according to claim 1, wherein, The antioxidant includes antioxidant 4020 and antioxidant RD, and the mass ratio of antioxidant 4020 to antioxidant RD is (2 - 3):(1 - 2).

5. The tread compound according to claim 1, wherein The smoked sheet rubber is No.1 smoked sheet rubber or No.3 smoked sheet rubber; The number-average molecular weight of the first type of smoked sheet rubber is 1×10 6 ~1×10 7 Daltons.

6. The tread compound according to claim 1, wherein, The silane coupling agent includes Si75 and / or Si69; The conductive carbon black is CXV72 conductive carbon black; The dispersant includes at least one of RF - 44 and RF - 40; The anti - vulcanization reducing agent includes at least one of WK - 901 and VIVA - 77; The scorch retarder is CTP.

7. The tread rubber according to claim 1, characterized in that, The accelerator includes at least one of accelerator NS, accelerator CZ, and accelerator TBSI.

8. A method for preparing a tire tread rubber as described in any one of claims 1 to 7, characterized in that, It includes the following steps: Mix the smoked sheet rubber or natural rubber with 30 - 40% by mass of high abrasion furnace black in a mixer, discharge the mixture after mixing, then enter an extruder. After screw extrusion, it is wrapped around the roll and sliced, and then cooled to obtain the first - stage carbon black plastic. Perform the second - stage mixing of the first - stage carbon black plastic with the remaining high abrasion furnace black, highly dispersible precipitated silica, conductive carbon black, silane coupling agent, aromatic oil, antioxidant, protective wax, stearic acid, zinc oxide, and dispersant to obtain the second - stage mixing masterbatch. Perform the third - stage mixing of the second - stage mixing masterbatch with sulfur, accelerator, scorch retarder, and anti - vulcanization reducing agent to obtain the tire tread rubber.

9. The preparation method of the tire tread rubber according to claim 8, wherein, It includes the following steps: Mix the smoked sheet rubber with 30 - 40% by mass of high abrasion furnace black in a mixer at a rotational speed of 40 - 50 rpm, discharge the mixture when the temperature reaches 135 - 140 °C, then enter an extruder. After screw extrusion, it is wrapped around the roll and sliced, and cooled to 40 - 45 °C, and then stored for 8 - 24 h to obtain the first - stage carbon black plastic. Perform the second - stage mixing of the first - stage carbon black plastic with the remaining high abrasion furnace black, highly dispersible precipitated silica, conductive carbon black, silane coupling agent, aromatic oil, antioxidant, protective wax, stearic acid, zinc oxide, and dispersant in a mixer at a rotational speed of 40 - 50 rpm, and discharge the mixture when the temperature reaches 145 - 150 °C to obtain the second - stage mixing masterbatch. Perform the third - stage mixing of the second - stage mixing masterbatch with sulfur, accelerator, scorch retarder, and anti - vulcanization reducing agent in a mixer at a rotational speed of 20 - 30 rpm, and discharge the mixture when the temperature reaches 110 - 115 °C to obtain the tire tread rubber.

10. Use of a tire tread rubber as described in any one of claims 1 to 7 or a tire tread rubber prepared by the preparation method as described in any one of claims 8 to 9 in the preparation of tires for small unmanned aircraft.

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