Rubber composition for tires as well as preparation method and application of rubber composition

Abstract

The invention provides a rubber composition for tires as well as a preparation method and application of the rubber composition. According to the rubber composition for the tire, disclosed by the invention, the smoke sheet rubber with high molecular weight is applied, so that the mechanical property and the dynamic property of vulcanized rubber are greatly improved, and the neodymium butadiene rubber with wear resistance, fatigue aging resistance and lower heat generation is adopted; and the solution polymerized styrene-butadiene rubber which has higher thermal stability and keeps good flexing resistance at high temperature is applied, so that the comprehensive performance of the formula is improved in multiple aspects. According to the invention, the super wear-resistant N134, the bio-based white carbon black and the conductive carbon black are adopted, so that ultrahigh wear resistance of the formula is provided, heat generation is reduced, and the tire is prevented from losing efficacy due to accumulation of a large amount of heat in the continuous operation process; a high inorganic metal oxide filling amount method is adopted, the heat conductivity coefficient of the formula is greatly improved, the tolerance performance of the formula to heat accumulation is further improved, generated heat is timely guided out and dissipated in the use process under extreme conditions, and the running safety of tires is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and in particular to a rubber composition for tires, a preparation method thereof and an application thereof. Background Art

[0002] In today's global economic development, import and export trade is a key factor affecting the economic development of each country. The global shipping scale continues to expand, and higher and higher requirements are placed on the port container distribution capacity. The automation level of ports in various places continues to improve, the port area continues to expand, and the pace of unmanned port transfer equipment and oil-to-electric conversion is getting faster and faster. Higher requirements are placed on the quality of tires used in port equipment. The application of new unmanned transfer vehicles (AGVs) is increasing year by year, and higher comprehensive performance requirements are placed on the performance of tires.

[0003] Based on the continuous long-term operation, high-frequency use conditions and the use characteristics of AGV tire tread rubber requiring certain antistatic performance, the AGV tire tread must be wear-resistant, low heat generation, and good fatigue resistance. Since electric drive is the general trend, the tire also needs to have conductive properties. Developing an AGV tire tread rubber with high comprehensive performance is of great significance to ensure the safe driving of port AGV tires and extend the service life of tires.

[0004] At present, the port AGV tires are still using traditional conventional tires, and the tire performance mainly focuses on wear resistance and weather aging resistance. They cannot fully meet the use requirements of AGV tires, and there is no tread formula with excellent comprehensive performance in all aspects. Summary of the invention

[0005] In view of this, the present invention proposes a rubber composition for tires and a preparation method and application thereof to solve the technical defects existing in the prior art.

[0006] In a first aspect, the present invention provides a rubber composition for a tire, comprising the following components in parts by weight:

[0007] 60-70 parts of smoked sheet rubber, 10-20 parts of solution-polymerized styrene-butadiene rubber, 20-30 parts of neodymium-based butadiene rubber, 125-130 parts of reinforcing material, 1-2 parts of silane coupling agent, 2-3 parts of microcrystalline wax, 2-3 parts of tear-resistant resin, 5-10 parts of zinc oxide, 1-2 parts of stearic acid, 2-6 parts of antioxidant, 1-2 parts of insoluble sulfur, 1-2 parts of accelerator, and 0.1-1 part of scorch retarder.

[0008] Preferably, the molecular weight of the tobacco sheet glue is 10 6 ~10 7 .

[0009] Preferably, the cis mass content of the neodymium-based butadiene rubber is >98%.

[0010] Preferably, the mass content of styrene in the solution polymerized styrene-butadiene rubber is 20% to 22%.

[0011] Preferably, the reinforcing material includes at least one of white carbon black, carbon black and conductive carbon black.

[0012] Preferably, the reinforcing material comprises the following components in parts by weight: 6 to 10 parts of white carbon black, 100 to 110 parts of carbon black, and 5 to 10 parts of conductive carbon black.

[0013] Preferably, the carbon black includes carbon black N134 and / or carbon black N234;

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

[0015] And / or, the antioxidant includes antioxidant RD and / or antioxidant 4020;

[0016] And / or, the accelerator includes accelerator D and / or accelerator NS;

[0017] And / or, the anti-scorch agent includes anti-scorch agent CTP;

[0018] And / or, the tear-resistant resin includes dicyclopentadiene resin.

[0019] In a second aspect, the present invention further provides a method for preparing the tire rubber composition, comprising the following steps:

[0020] Mixing the tobacco sheet rubber and part of the carbon black in a first internal mixer, and draining the rubber to obtain tobacco sheet rubber carbon black plasticized rubber;

[0021] Adding smoked sheet rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, remaining carbon black, bio-based white carbon black, conductive carbon black, zinc oxide, stearic acid, silane coupling agent, microcrystalline wax, antioxidant, and tear-resistant resin into the second internal mixer, mixing, discharging the rubber, and extruding into the extruder to obtain a masterbatch mixed rubber;

[0022] The masterbatch rubber, insoluble sulfur, accelerator and scorch retarder are added into the third internal mixer, mixed, discharged to an open mixer, turned over, and the final rubber is obtained, which is the rubber composition for tires.

[0023] Preferably, the method comprises the following steps:

[0024] The speed of the first internal mixer is set to 50-60 rpm, the tobacco sheet glue is put into the first internal mixer, and the top bolt is pressed for 60-70 seconds; the top bolt is raised, and carbon black with a mass fraction of 30-40% is added, and the top bolt is pressed. When the temperature of the rubber material rises to 130-140° C., the top bolt is raised and maintained for 20-30 seconds, the speed of the first internal mixer is adjusted to 40-50 rpm, the top bolt is pressed, and when the temperature of the rubber material rises to 150-155° C., the rubber is discharged to obtain tobacco sheet glue carbon black plasticized rubber;

[0025] Set the speed of the second internal mixer to 40-45rpm, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, the remaining carbon black, bio-based white carbon black, conductive carbon black, zinc oxide, stearic acid, silane coupling agent, microcrystalline wax, antioxidant, tear-resistant resin into the second internal mixer, press the top bolt for 30-40s; raise the top bolt, keep it for 10-20s, press the top bolt, wait for the temperature of the rubber material to rise to 130-140℃; raise the top bolt, keep it for 10-20s, press the top bolt, mix to 153-155℃, reduce the speed of the second internal mixer to 5-10rpm, mix for 50-60s, discharge the rubber, enter the extruder for extrusion, roll the sheet, cool to 40℃-45℃, park for 8h-24h, and obtain the masterbatch rubber;

[0026] The speed of the third internal mixer is set to 15-20rpm, the masterbatch, insoluble sulfur, accelerator and scorch retarder are added to the third internal mixer, the top bolt is pressed, mixing is carried out to 90-100°C, the top bolt is lifted and held for 5-10s, the top bolt is pressed, mixing is carried out to 100-110°C, and the material is discharged to the open mixer; the roller temperature of the open mixer is raised to 70-80°C, the rubber is turned on the open mixer, and after the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40-45°C, and left for 8h-24h to obtain the final rubber mixture, which is the rubber composition for tires.

[0027] In a third aspect, the present invention further provides a rubber composition for a tire or use of the rubber composition for a tire in preparing tires for unmanned transport vehicles.

[0028] The tire rubber composition of the present invention and its preparation method and application have the following beneficial effects compared with the prior art:

[0029] 1. The tire rubber composition of the present invention has a reasonable ratio of the rubber composition formula and uses a high-weight smoke sheet rubber, which greatly improves the mechanical properties and dynamic properties of the vulcanized rubber. It uses a neodymium-based butadiene rubber with good wear resistance, fatigue aging resistance and lower heat generation, and uses a solution-polymerized butadiene styrene rubber with better thermal stability and good flexibility resistance at high temperatures, thereby improving the comprehensive performance of the formula in many aspects. The service life of the tire can be increased by 10%-15%; the present invention adopts super wear-resistant N134 and uses bio-based white carbon black and conductive carbon black to provide the formula with ultra-high wear resistance while reducing heat generation, so that the tire will not fail due to a large amount of heat accumulation during continuous operation; the present invention adopts a high inorganic metal oxide (i.e. zinc oxide) filling method to greatly improve the thermal conductivity of the formula, further improve the tolerance of the formula to heat accumulation, and during use under extreme conditions, the generated heat is promptly conducted and dissipated to ensure the safe operation of the tire; the present invention uses super wear-resistant carbon black to improve the conductivity of the tire tread, and fills conductive carbon black to further reduce the resistance of the tread rubber. Compared with ordinary treads, the resistance is reduced by 50% and is less than 100,000Ω, so that the tread rubber can promptly conduct static electricity when it contacts the ground, thereby improving the safety of equipment use; the present invention increases the use of bio-based white carbon black, reduces the use of carbon black, reduces the emission of carbon dioxide, and has immeasurable economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 is the change in tensile strength of the rubber composition for tires prepared in Examples 1 to 4 and Comparative Examples 1 to 2;

[0032] Figure 2 The temperature rise change of the middle part of the rubber composition for tire prepared in Examples 1 to 4 and Comparative Examples 1 to 2;

[0033] Figure 3 is the volume resistance change of the rubber composition for tire prepared in Examples 1 to 4 and Comparative Examples 1 to 2;

[0034] Figure 4 is the Akron wear change of the tire rubber composition prepared in Examples 1 to 4 and Comparative Examples 1 to 2;

[0035] Figure 5 The thermal conductivity at 60° C. of the rubber compositions for tires prepared in Examples 1 to 4 and Comparative Examples 1 to 2 varies. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present application provides a rubber composition for a tire, comprising the following components in parts by weight:

[0038] 60-70 parts of smoked sheet rubber, 10-20 parts of solution-polymerized styrene-butadiene rubber, 20-30 parts of neodymium-based butadiene rubber, 125-130 parts of reinforcing material, 1-2 parts of silane coupling agent, 2-3 parts of microcrystalline wax, 2-3 parts of tear-resistant resin, 5-10 parts of zinc oxide, 1-2 parts of stearic acid, 2-6 parts of antioxidant, 1-2 parts of insoluble sulfur, 1-2 parts of accelerator, and 0.1-1 part of scorch retarder.

[0039] The rubber composition for tires of the present invention comprises the following raw rubber components: 60-70 parts of smoked sheet rubber, 10-20 parts of solution polymerized styrene butadiene rubber, and 20-30 parts of neodymium-based butadiene rubber; the molecular weight of the smoked sheet rubber is 1×10 6 ~1×10 7 g / mol, high molecular weight smoke sheet rubber is used to improve the mechanical properties of the formula, improve the strength and comprehensive performance of the formula; the cis-butadiene rubber is neodymium-based cis-butadiene rubber, and the cis content is >98%. The use of neodymium-based cis-butadiene rubber has higher strength, better wear resistance and fatigue aging resistance, and lower heat generation, which is better than the nickel-based cis-butadiene rubber used in the traditional formula; the styrene-butadiene rubber is solution-polymerized styrene-butadiene rubber, and the styrene content is 20% to 22%. The solution-polymerized styrene-butadiene rubber has good thermal stability, is not easy to age, and maintains good flexibility resistance at high temperatures. The preferred use of raw rubber makes the formula comprehensively improved in terms of comprehensive performance.

[0040] In some embodiments, the molecular weight of the smoke sheet glue is 10 6 ~10 7 .

[0041] In some embodiments, the cis-form content of the neodymium-based butadiene rubber is greater than 98%.

[0042] In some embodiments, the mass content of styrene in the solution polymerized styrene-butadiene rubber is 20% to 22%.

[0043] In some embodiments, the reinforcing material includes at least one of white carbon black, carbon black, and conductive carbon black.

[0044] In some embodiments, the reinforcing material includes the following components in parts by weight: 6 to 10 parts of white carbon black, 100 to 110 parts of carbon black, and 5 to 10 parts of conductive carbon black.

[0045] In some embodiments, the carbon black includes carbon black N134 and / or carbon black N234, the carbon black N234 is CABOT rubber carbon black N234, and the carbon black N134 is Neste carbon black N134 rubber carbon black.

[0046] In some embodiments, the white carbon black is bio-based white carbon black; and the conductive carbon black is V72 conductive carbon black, ie, Cabot VXC72 conductive carbon black.

[0047] In some embodiments, the silane coupling agent includes Si75 and / or Si69. Specifically, Si75 bis-[γ-(triethoxysilyl)propyl]-disulfide (Si75); silane coupling agent Si-69, chemical name is bis-[γ-(triethoxysilyl)propyl]tetrasulfide.

[0048] In some embodiments, the antioxidant includes antioxidant RD and / or antioxidant 4020. Specifically, antioxidant RD, also known as antioxidant RD, antioxidant 224, has a molecular formula of C 12 H 17 N; Antioxidant 4020, also known as antioxidant DMBPPD, is a p-phenylenediamine rubber antioxidant with a molecular formula of C 18 H 24 N2.

[0049] In some embodiments, the promoter includes promoter D and / or promoter NS. Promoter D, also known as diphenylguanidine, has a molecular formula of C 13 H 13 N3; Accelerator NS, chemical name: N-tert-butyl-2-benzothiazole xanthamide, molecular formula C 11 H 14 N2S2.

[0050] In some embodiments, the scorch retarder includes scorch retarder CTP, which is N-cyclohexylthiophthalimide, with a molecular formula of C 14 H 15 O2NS.

[0051] In some embodiments, the tear-resistant resin includes dicyclopentadiene resin, and specifically can be Korean Kolon tear-resistant resin: dicyclopentadiene resin KPE-F6115 (dicyclopentadiene phenolic resin).

[0052] In some embodiments, the insoluble sulfur is Flex Insoluble Sulfur OT-20.

[0053] Based on the same inventive concept, the present invention also provides a method for preparing the above-mentioned tire rubber composition, comprising the following steps:

[0054] S1, mixing the tobacco sheet rubber and part of the carbon black in a first internal mixer, and removing the rubber to obtain tobacco sheet rubber carbon black plasticized rubber;

[0055] S2, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, remaining carbon black, bio-based white carbon black, conductive carbon black, zinc oxide, stearic acid, silane coupling agent, microcrystalline wax, antioxidant, tear-resistant resin into the second internal mixer, mix, discharge the rubber, and extrude into the extruder to obtain a masterbatch mixed rubber;

[0056] S3, adding the masterbatch rubber mix, insoluble sulfur, accelerator, and scorch retarder into a third internal mixer, mixing, discharging the materials to an open mixer, turning the rubber, and obtaining a final rubber mix, namely, a rubber composition for tires.

[0057] In some embodiments, a method for preparing a rubber composition for a tire comprises the following steps:

[0058] S1. Set the speed of the first internal mixer to 50-60 rpm, put the tobacco sheet glue into the first internal mixer, and press the top bolt for 60-70 seconds; raise the top bolt, add carbon black with a mass fraction of 30-40%, press the top bolt, wait for the temperature of the rubber compound to rise to 130-140°C, raise the top bolt, keep it for 20-30 seconds, adjust the speed of the first internal mixer to 40-50 rpm, press the top bolt, wait for the temperature of the rubber compound to rise to 150-155°C, discharge the glue, and obtain tobacco sheet glue carbon black plasticized rubber;

[0059] S2, set the speed of the second internal mixer to 40-45rpm, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, the remaining carbon black, bio-based white carbon black, conductive carbon black, zinc oxide, stearic acid, silane coupling agent, microcrystalline wax, antioxidant, tear-resistant resin into the second internal mixer, press the top bolt for 30-40s; raise the top bolt, hold for 10-20s, press the top bolt, wait for the rubber temperature to rise to 130-140°C; raise the top bolt, hold for 10-20s, press the top bolt, mix to 153-155°C, reduce the speed of the second internal mixer to 5-10rpm, mix for 50-60s, discharge the rubber, enter the extruder for extrusion, roll the sheet, cool to 40-45°C, park for 8h-24h, and obtain the masterbatch rubber;

[0060] S3. Set the speed of the third internal mixer to 15-20 rpm, add the masterbatch, insoluble sulfur, accelerator and scorch retarder into the third internal mixer, press the top bolt, mix to 90-100° C., lift the top bolt and hold for 5-10 seconds, press the top bolt, mix to 100-110° C., and discharge to the open mixer; the temperature of the roller of the open mixer is raised to 70-80° C., and the rubber is turned on the open mixer. After the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40-45° C., and left for 8-24 hours to obtain the final rubber, which is the rubber composition for tires.

[0061] Based on the same inventive concept, the present invention also provides an application of the above-mentioned rubber composition for tires or the rubber composition for tires prepared by the above-mentioned method in preparing tires for unmanned transport vehicles.

[0062] The present invention aims at the defects of the tires used in the existing traditional port AGV (automatic transfer vehicle), and provides a new rubber composition for tires used in port AGV and a preparation method. High-performance smoked sheet rubber is adopted to improve the comprehensive performance of the tread formula, and neodymium-based butadiene rubber and solution-polymerized styrene butadiene rubber are adopted to improve the wear resistance and fatigue aging resistance. Through the reasonable proportion of materials, the dispersion of super wear-resistant carbon black, bio-based white carbon black and conductive carbon black is improved, and the mixing process performance is better. While ensuring the mechanical properties of the rubber compound, the requirements of wear resistance, low heat generation, fatigue resistance and conductivity of the AGV tire tread can be taken into account, and the comprehensive performance is improved to increase the service life of the tire.

[0063] The tire rubber composition and preparation method thereof of the present invention adopts a raw rubber system composed of high-performance smoked sheet rubber, solution-polymerized styrene butadiene rubber, and neodymium-based cis-butadiene rubber. When the tire carries high-load equipment and runs for a long time, the high-performance smoked sheet rubber has excellent comprehensive performance. In addition, solution-polymerized styrene butadiene rubber and neodymium-based cis-butadiene rubber are used. The neodymium-based cis-butadiene rubber has a cis molecular structure of more than 98%. During the long-term operation of the tire, the wear resistance and fatigue aging resistance of the rubber material can be improved. Due to the higher cis content, the flexibility between the material molecules is better, the internal friction heat generation is lower, and the solution-polymerized styrene butadiene rubber is used, and the thermal stability of the tread rubber during the operation process is better. The reinforcement system uses N134 super wear-resistant carbon black, bio-based white carbon black, and V72 conductive carbon black. N134 carbon black is a super wear-resistant carbon black with finer particles. The tread with N134 carbon black has high strength, and the wear resistance and resilience are significantly improved. V72 conductive carbon black has good conductivity. The addition of V72 conductive carbon black can significantly improve the conductivity of the tire tread, and the resistance is significantly reduced, which effectively prevents static electricity accumulation and improves the safety of equipment operation. Adding bio-based white carbon black can significantly improve the tear resistance of the rubber and reduce the hysteresis heat generation of the rubber. Using bio-based white carbon black and super wear-resistant carbon black together can improve the comprehensive performance of the tread rubber. At the same time, bio-based white carbon black is a sustainable green material, which is green and environmentally friendly. The high inorganic metal oxide filling method greatly improves the thermal conductivity of the formula, and further improves the formula's tolerance to heat accumulation. During use under extreme conditions, the heat generated will be promptly discharged to ensure the safe operation of the tire. The anti-aging system using p-phenylenediamine antioxidant 4020 and ketamine antioxidant RD has good protective effects on aging such as ozone resistance, dynamic flex fatigue, and thermal oxidation. Compared with ordinary sulfur, insoluble sulfur has larger molecules and higher melting points. It is not easy to burn after mixing and in the subsequent semi-component basic production process, and can avoid interfacial bonding caused by frost spraying. Adding tear-resistant resin can improve the modulus stability of rubber materials during use, make fatigue cracks less likely, and slow down the growth rate of rubber aging cracks.

[0064] The tread rubber compound of the present invention has significantly better comprehensive performance than the tread of traditional port tires through a specific combination of materials and advanced processing technology. The compound is used as a tread rubber compound for special tires for port AGVs. Under the conditions of long-term, high-frequency, high-load and static electricity accumulation, the tread rubber will not have problems such as tread block loss, early shoulder voids, and groove cracks, and has better wear resistance and conductive properties. With the above advantages, the tire has a long service life and safer operation.

[0065] The following further describes the tire rubber composition and its preparation method of the present application with specific examples. This section further describes the content of the present invention in conjunction with specific examples, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the examples are conventional means 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.

[0066] Example 1

[0067] This embodiment provides a rubber composition for a tire, comprising the following components in parts by weight:

[0068] 60 parts of smoked sheet rubber, 10 parts of solution polymerized styrene butadiene rubber, 30 parts of neodymium-based butadiene rubber, 8 parts of rice husk-derived bio-based white carbon black, 54 parts of carbon black N134, 8 parts of V72 conductive carbon black, 1.6 parts of silane coupling agent Si69, 2 parts of microcrystalline wax, 2 parts of tear-resistant resin, 8 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 1.8 parts of insoluble sulfur OT-20, 1.2 parts of accelerator NS, and 0.1 parts of scorch retarder CTP;

[0069] The smoked sheet glue is Indonesian No. 1 smoked sheet glue RSS1 (i.e. RSS1# smoked sheet glue), with a molecular weight of 10 6 ~10 7 ;

[0070] The solution polymerized styrene butadiene rubber is the functionalized solution polymerized styrene butadiene rubber SSBR72612F produced by Dushanzi Petrochemical Company, and the mass content of styrene in the solution polymerized styrene butadiene rubber is 20% to 22%;

[0071] The neodymium-based butadiene rubber is Dushanzi Petrochemical-neodymium-based butadiene rubber BR9101, and the cis mass content in the neodymium-based butadiene rubber is >98%;

[0072] The bio-based silica is SilicaPowder-K160, a rice husk-derived bio-based silica (silica extracted from rice husk ash) produced by Panjin (Fenghai) Rice Biotechnology Co., Ltd. (an enterprise invested by Yihai Kerry Golden Dragon Fish Cereals, Oils and Foodstuffs Co., Ltd.);

[0073] The tear-resistant resin is Korean Kolon tear-resistant resin: dicyclopentadiene resin KPE-F6115;

[0074] The method for preparing the tire rubber composition comprises the following steps:

[0075] S1. Set the speed of the first internal mixer to 55 rpm, put the tobacco sheet glue into the first internal mixer, and press the top bolt for 60 seconds; raise the top bolt, add carbon black N134 with a mass fraction of 30%, press the top bolt, wait for the temperature of the rubber compound to rise to 130°C, raise the top bolt, keep it for 20 seconds, adjust the speed of the first internal mixer to 40 rpm, press the top bolt, wait for the temperature of the rubber compound to rise to 150°C, discharge the glue, and obtain tobacco sheet glue carbon black plasticized rubber;

[0076] S2, set the speed of the second internal mixer to 40rpm, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, the remaining mass fraction of 70% carbon black N134, bio-based white carbon black, V72 conductive carbon black, zinc oxide, stearic acid, silane coupling agent Si69, microcrystalline wax, antioxidant 4020, antioxidant RD, tear-resistant resin into the second internal mixer, press the top bolt for 30s; raise the top bolt, hold for 10s, press the top bolt, wait for the rubber temperature to rise to 130°C; raise the top bolt, hold for 10s, press the top bolt, mix to 155°C, reduce the speed of the second internal mixer to 10rpm, mix for 50s, discharge the glue, enter the extruder for extrusion, roll the sheet, cool to 40°C, park for 24h, and obtain the masterbatch rubber;

[0077] S3. Set the speed of the third internal mixer to 20 rpm, add the masterbatch, insoluble sulfur OT-20, accelerator NS and anti-scorch agent CTP into the third internal mixer, press the top bolt, mix to 90°C, lift the top bolt and hold for 5 seconds, press the top bolt, mix to 100°C, and discharge to the open mixer; the temperature of the roller of the open mixer is raised to 70°C, and the rubber is turned on the open mixer. After the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40°C, and left for 24 hours to obtain the final rubber mixture, which is the rubber composition for tires.

[0078] Example 2

[0079] This embodiment provides a rubber composition for a tire, comprising the following components in parts by weight:

[0080] 65 parts of smoked sheet rubber, 10 parts of solution polymerized styrene butadiene rubber, 25 parts of neodymium-based butadiene rubber, 8 parts of bio-based white carbon black, 55 parts of carbon black N134, 8 parts of V72 conductive carbon black, 1.6 parts of silane coupling agent Si69, 2 parts of microcrystalline wax, 2 parts of tear-resistant resin, 8 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 1.8 parts of insoluble sulfur OT-20, 1.2 parts of accelerator NS, 0.1 parts of scorch retarder CTP;

[0081] The smoked sheet glue is Indonesian No. 1 smoked sheet glue RSS1 (i.e. RSS1# smoked sheet glue), with a molecular weight of 10 6 ~10 7 ;

[0082] The solution polymerized styrene butadiene rubber is the functionalized solution polymerized styrene butadiene rubber SSBR72612F produced by Dushanzi Petrochemical Company, and the mass content of styrene in the solution polymerized styrene butadiene rubber is 20% to 22%;

[0083] The neodymium-based butadiene rubber is Dushanzi Petrochemical-neodymium-based butadiene rubber BR9101, and the cis mass content in the neodymium-based butadiene rubber is >98%;

[0084] The bio-based silica is SilicaPowder-K160, a rice husk-derived bio-based silica (silica extracted from rice husk ash) produced by Panjin (Fenghai) Rice Biotechnology Co., Ltd. (an enterprise invested by Yihai Kerry Golden Dragon Fish Cereals, Oils and Foodstuffs Co., Ltd.);

[0085] The tear-resistant resin is Korean Kolon tear-resistant resin: dicyclopentadiene resin KPE-F6115;

[0086] The method for preparing the tire rubber composition comprises the following steps:

[0087] S1. Set the speed of the first internal mixer to 55 rpm, put the tobacco sheet glue into the first internal mixer, and press the top bolt for 60 seconds; raise the top bolt, add carbon black N134 with a mass fraction of 30%, press the top bolt, wait for the temperature of the rubber compound to rise to 130°C, raise the top bolt, keep it for 20 seconds, adjust the speed of the first internal mixer to 40 rpm, press the top bolt, wait for the temperature of the rubber compound to rise to 150°C, discharge the glue, and obtain tobacco sheet glue carbon black plasticized rubber;

[0088] S2, set the speed of the second internal mixer to 40rpm, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, the remaining mass fraction of 70% carbon black N134, bio-based white carbon black, V72 conductive carbon black, zinc oxide, stearic acid, silane coupling agent Si69, microcrystalline wax, antioxidant 4020, antioxidant RD, tear-resistant resin into the second internal mixer, press the top bolt for 30s; raise the top bolt, hold for 10s, press the top bolt, wait for the rubber temperature to rise to 130°C; raise the top bolt, hold for 10s, press the top bolt, mix to 155°C, reduce the speed of the second internal mixer to 10rpm, mix for 50s, discharge the glue, enter the extruder for extrusion, roll the sheet, cool to 40°C, park for 24h, and obtain the masterbatch rubber;

[0089] S3. Set the speed of the third internal mixer to 20 rpm, add the masterbatch, insoluble sulfur OT-20, accelerator NS and anti-scorch agent CTP into the third internal mixer, press the top bolt, mix to 90°C, lift the top bolt and hold for 5 seconds, press the top bolt, mix to 100°C, and discharge to the open mixer; the temperature of the roller of the open mixer is raised to 70°C, and the rubber is turned on the open mixer. After the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40°C, and left for 24 hours to obtain the final rubber mixture, which is the rubber composition for tires.

[0090] Example 3

[0091] This embodiment provides a rubber composition for a tire, comprising the following components in parts by weight:

[0092] 70 parts of smoked sheet rubber, 10 parts of solution polymerized styrene butadiene rubber, 20 parts of neodymium-based butadiene rubber, 8 parts of bio-based white carbon black, 54 parts of carbon black N134, 8 parts of V72 conductive carbon black, 1.6 parts of silane coupling agent Si69, 2 parts of microcrystalline wax, 2 parts of tear-resistant resin, 8 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 1.8 parts of insoluble sulfur OT-20, 1.2 parts of accelerator NS, 0.1 parts of scorch retarder CTP;

[0093] The smoked sheet glue is Indonesian No. 1 smoked sheet glue RSS1 (i.e. RSS1# smoked sheet glue), with a molecular weight of 10 6 ~10 7 ;

[0094] The solution polymerized styrene butadiene rubber is the functionalized solution polymerized styrene butadiene rubber SSBR72612F produced by Dushanzi Petrochemical Company, and the mass content of styrene in the solution polymerized styrene butadiene rubber is 20% to 22%;

[0095] The neodymium-based butadiene rubber is Dushanzi Petrochemical-neodymium-based butadiene rubber BR9101, and the cis mass content in the neodymium-based butadiene rubber is >98%;

[0096] The bio-based silica is SilicaPowder-K160, a rice husk-derived bio-based silica (silica extracted from rice husk ash) produced by Panjin (Fenghai) Rice Biotechnology Co., Ltd. (an enterprise invested by Yihai Kerry Golden Dragon Fish Cereals, Oils and Foodstuffs Co., Ltd.);

[0097] The tear-resistant resin is Korean Kolon tear-resistant resin: dicyclopentadiene resin KPE-F6115;

[0098] The method for preparing the tire rubber composition comprises the following steps:

[0099] S1. Set the speed of the first internal mixer to 55 rpm, put the tobacco sheet glue into the first internal mixer, and press the top bolt for 60 seconds; raise the top bolt, add carbon black N134 with a mass fraction of 30%, press the top bolt, wait for the temperature of the rubber compound to rise to 130°C, raise the top bolt, keep it for 20 seconds, adjust the speed of the first internal mixer to 40 rpm, press the top bolt, wait for the temperature of the rubber compound to rise to 150°C, discharge the glue, and obtain tobacco sheet glue carbon black plasticized rubber;

[0100] S2, set the speed of the second internal mixer to 40rpm, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, the remaining mass fraction of 70% carbon black N134, bio-based white carbon black, V72 conductive carbon black, zinc oxide, stearic acid, silane coupling agent Si69, microcrystalline wax, antioxidant 4020, antioxidant RD, tear-resistant resin into the second internal mixer, press the top bolt for 30s; raise the top bolt, hold for 10s, press the top bolt, wait for the rubber temperature to rise to 130°C; raise the top bolt, hold for 10s, press the top bolt, mix to 155°C, reduce the speed of the second internal mixer to 10rpm, mix for 50s, discharge the glue, enter the extruder for extrusion, roll the sheet, cool to 40°C, park for 24h, and obtain the masterbatch rubber;

[0101] S3. Set the speed of the third internal mixer to 20 rpm, add the masterbatch, insoluble sulfur OT-20, accelerator NS and anti-scorch agent CTP into the third internal mixer, press the top bolt, mix to 90°C, lift the top bolt and hold for 5 seconds, press the top bolt, mix to 100°C, and discharge to the open mixer; the temperature of the roller of the open mixer is raised to 70°C, and the rubber is turned on the open mixer. After the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40°C, and left for 24 hours to obtain the final rubber mixture, which is the rubber composition for tires.

[0102] Example 4

[0103] This embodiment provides a rubber composition for a tire, comprising the following components in parts by weight:

[0104] 70 parts of smoked sheet rubber, 10 parts of solution polymerized styrene butadiene rubber, 20 parts of neodymium-based butadiene rubber, 8 parts of bio-based white carbon black, 55 parts of carbon black N234, 1.6 parts of silane coupling agent Si69, 2 parts of microcrystalline wax, 2 parts of tear-resistant resin, 8 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 1.8 parts of insoluble sulfur OT-20, 1.2 parts of accelerator NS, 0.1 parts of scorch retarder CTP;

[0105] The smoked sheet glue is Indonesian No. 1 smoked sheet glue RSS1 (i.e. RSS1# smoked sheet glue), with a molecular weight of 10 6 ~10 7 ;

[0106] The solution polymerized styrene butadiene rubber is the functionalized solution polymerized styrene butadiene rubber SSBR72612F produced by Dushanzi Petrochemical Company, and the mass content of styrene in the solution polymerized styrene butadiene rubber is 20% to 22%;

[0107] The neodymium-based butadiene rubber is Dushanzi Petrochemical-neodymium-based butadiene rubber BR9101, and the cis mass content in the neodymium-based butadiene rubber is >98%;

[0108] The bio-based silica is SilicaPowder-K160, a rice husk-derived bio-based silica (silica extracted from rice husk ash) produced by Panjin (Fenghai) Rice Biotechnology Co., Ltd. (an enterprise invested by Yihai Kerry Golden Dragon Fish Cereals, Oils and Foodstuffs Co., Ltd.);

[0109] The tear-resistant resin is Korean Kolon tear-resistant resin: dicyclopentadiene resin KPE-F6115;

[0110] The method for preparing the tire rubber composition comprises the following steps:

[0111] S1. Set the speed of the first internal mixer to 55 rpm, put the tobacco sheet glue into the first internal mixer, and press the top bolt for 60 seconds; raise the top bolt, add carbon black N234 with a mass fraction of 30%, press the top bolt, wait for the rubber temperature to rise to 130°C, raise the top bolt, keep it for 20 seconds, adjust the speed of the first internal mixer to 40 rpm, press the top bolt, wait for the rubber temperature to rise to 150°C, discharge the glue, and obtain tobacco sheet glue carbon black plasticized rubber;

[0112] S2, set the speed of the second internal mixer to 40rpm, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, the remaining mass fraction of 70% carbon black N234, bio-based white carbon black, zinc oxide, stearic acid, silane coupling agent Si69, microcrystalline wax, antioxidant 4020, antioxidant RD, tear-resistant resin into the second internal mixer, press the top bolt for 30s; raise the top bolt, hold for 10s, press the top bolt, wait for the rubber temperature to rise to 130°C; raise the top bolt, hold for 10s, press the top bolt, mix to 155°C, reduce the speed of the second internal mixer to 10rpm, mix for 50s, discharge the glue, enter the extruder for extrusion, roll the sheet, cool to 40°C, park for 24h, and obtain the masterbatch rubber;

[0113] S3. Set the speed of the third internal mixer to 20 rpm, add the masterbatch, insoluble sulfur OT-20, accelerator NS and anti-scorch agent CTP into the third internal mixer, press the top bolt, mix to 90°C, lift the top bolt and hold for 5 seconds, press the top bolt, mix to 100°C, and discharge to the open mixer; the temperature of the roller of the open mixer is raised to 70°C, and the rubber is turned on the open mixer. After the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40°C, and left for 24 hours to obtain the final rubber mixture, which is the rubber composition for tires.

[0114] Comparative Example 1

[0115] This comparative example provides a rubber composition for a tire, comprising the following components in parts by weight:

[0116] 65 parts of natural rubber, 35 parts of butadiene rubber, 62 parts of carbon black N234, 2 parts of microcrystalline wax, 3 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 4 parts of aromatic oil, 1.8 parts of insoluble sulfur OT-20, 1.2 parts of accelerator NS, 0.1 parts of anti-scorch agent CTP;

[0117] The natural rubber is 20# natural rubber (i.e. natural rubber TSR-20);

[0118] Butadiene rubber is Daqing Petrochemical butadiene rubber, brand BR9000;

[0119] The method for preparing the tire rubber composition comprises the following steps:

[0120] S1. Set the speed of the first internal mixer to 55 rpm, put the natural rubber into the first internal mixer, and press the top bolt for 60 seconds; raise the top bolt, add 30% carbon black N234 by mass, press the top bolt, wait for the rubber temperature to rise to 130°C, raise the top bolt, keep it for 20 seconds, adjust the speed of the first internal mixer to 40 rpm, press the top bolt, wait for the rubber temperature to rise to 150°C, discharge the rubber, and obtain natural rubber carbon black plasticized rubber;

[0121] S2, set the speed of the second internal mixer to 40rpm, add natural rubber carbon black plasticized rubber, butadiene rubber, the remaining mass fraction of 70% carbon black N234, zinc oxide, stearic acid, microcrystalline wax, antioxidant 4020, antioxidant RD, aromatic oil into the second internal mixer, press the top bolt for 30s; raise the top bolt, hold for 10s, press the top bolt, wait for the rubber temperature to rise to 130°C; raise the top bolt, hold for 10s, press the top bolt, mix to 155°C, reduce the speed of the second internal mixer to 10rpm, mix for 50s, discharge the glue, enter the extruder for extrusion, roll the sheet, cool to 40°C, park for 24h, and obtain the masterbatch rubber;

[0122] S3. Set the speed of the third internal mixer to 20 rpm, add the masterbatch, insoluble sulfur OT-20, accelerator NS and anti-scorch agent CTP into the third internal mixer, press the top bolt, mix to 90°C, lift the top bolt and hold for 5 seconds, press the top bolt, mix to 100°C, and discharge to the open mixer; the temperature of the roller of the open mixer is raised to 70°C, and the rubber is turned on the open mixer. After the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40°C, and left for 24 hours to obtain the final rubber mixture, which is the rubber composition for tires.

[0123] Comparative Example 2

[0124] This comparative example provides a rubber composition for a tire, comprising the following components in parts by weight:

[0125] 70 parts of natural rubber, 30 parts of butadiene rubber, 62 parts of carbon black N234, 2 parts of microcrystalline wax, 3 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 4 parts of aromatic oil, 1.8 parts of insoluble sulfur OT-20, 1.2 parts of accelerator NS, 0.1 parts of anti-scorch agent CTP;

[0126] The natural rubber is 20# natural rubber (i.e. natural rubber TSR-20);

[0127] Butadiene rubber is Daqing Petrochemical butadiene rubber, brand BR9000;

[0128] The method for preparing the tire rubber composition comprises the following steps:

[0129] S1. Set the speed of the first internal mixer to 55 rpm, put the natural rubber into the first internal mixer, and press the top bolt for 60 seconds; raise the top bolt, add 30% carbon black N234 by mass, press the top bolt, wait for the rubber temperature to rise to 130°C, raise the top bolt, keep it for 20 seconds, adjust the speed of the first internal mixer to 40 rpm, press the top bolt, wait for the rubber temperature to rise to 150°C, discharge the rubber, and obtain natural rubber carbon black plasticized rubber;

[0130] S2, set the speed of the second internal mixer to 40rpm, add natural rubber carbon black plasticized rubber, butadiene rubber, the remaining mass fraction of 70% carbon black N234, zinc oxide, stearic acid, microcrystalline wax, antioxidant 4020, antioxidant RD, aromatic oil into the second internal mixer, press the top bolt for 30s; raise the top bolt, hold for 10s, press the top bolt, wait for the rubber temperature to rise to 130°C; raise the top bolt, hold for 10s, press the top bolt, mix to 155°C, reduce the speed of the second internal mixer to 10rpm, mix for 50s, discharge the glue, enter the extruder for extrusion, roll the sheet, cool to 40°C, park for 24h, and obtain the masterbatch rubber;

[0131] S3. Set the speed of the third internal mixer to 20 rpm, add the masterbatch, insoluble sulfur OT-20, accelerator NS and anti-scorch agent CTP into the third internal mixer, press the top bolt, mix to 90°C, lift the top bolt and hold for 5 seconds, press the top bolt, mix to 100°C, and discharge to the open mixer; the temperature of the roller of the open mixer is raised to 70°C, and the rubber is turned on the open mixer. After the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40°C, and left for 24 hours to obtain the final rubber mixture, which is the rubber composition for tires.

[0132] The weight parts of the raw materials of the tire rubber composition in the above Examples 1 to 4 and Comparative Examples 1 to 2 are shown in Table 1 below.

[0133] Table 1 - Weight parts of various raw materials in rubber compositions of different embodiments and comparative examples

[0134]

[0135]

[0136] The rubber compositions prepared in the above Examples 1 to 4 and Comparative Examples 1 to 2 were subjected to performance tests, mainly including basic physical and mechanical properties, wear resistance, flexural resistance, tear resistance, electrical conductivity, and thermal conductivity tests. The test results are shown in Table 2 below.

[0137] Table 2 - Properties of rubber compositions prepared in different embodiments and comparative examples

[0138]

[0139] In the above embodiments, 100% tensile strength, 300% tensile strength, tensile strength, and elongation at break are tested according to GB / T528-2009; tear strength is tested according to GB / T529-2009; density is tested according to GB / T533-2009; hardness is tested according to GB / T531.1-2009; bottom temperature rise, middle temperature rise, and compression permanent deformation rate are tested according to GB / T1687.3-2016; Akron abrasion is tested according to GB / T16-2014; flex cracking is tested according to GB / T13934-2006; volume resistance and volume resistivity are tested according to GB / T31838.2-2019; 60°C thermal conductivity is tested according to LaserFlashAnalysis laser flash thermal conductivity analysis method.

[0140] As can be seen from Table 2, compared with the ordinary natural rubber and butadiene rubber formula in Comparative Examples 1-2, the present invention mainly uses No. 1 smoked rubber, uses neodymium butadiene rubber and solution-polymerized styrene butadiene rubber, uses N134 carbon black and uses a weaker formula of bio-based white carbon black, and has higher physical and mechanical strength, higher tear strength, lower heat generation, better wear performance, and better flexural resistance. The volume resistance of the tread rubber prepared by partially replacing carbon black with conductive carbon black in the present invention is significantly reduced.

[0141] Figure 1 The tensile strength changes of the rubber compositions for tires prepared in Examples 1 to 4 and Comparative Examples 1 to 2.

[0142] Figure 2 The temperature rise changes in the middle of the rubber compositions for tires prepared in Examples 1 to 4 and Comparative Examples 1 to 2.

[0143] Figure 3 The volume resistivity changes of the rubber compositions for tires prepared in Examples 1 to 4 and Comparative Examples 1 to 2.

[0144] Figure 4The Akron wear changes of the rubber compositions for tires prepared in Examples 1 to 4 and Comparative Examples 1 to 2 are shown.

[0145] Figure 5 The thermal conductivity at 60° C. of the rubber compositions for tires prepared in Examples 1 to 4 and Comparative Examples 1 to 2 varies.

[0146] from Figures 1 to 5 It can be seen that the tensile strength of the rubber composition in Examples 1 to 4 is 1.4-2.7 MPa higher than that in Comparative Examples 1 to 2, and the physical and mechanical properties are improved by 6-12%; the temperature rise in the middle of the rubber composition in Examples 1 to 4 is 5-15°C lower than that in Comparative Examples 1 to 2, and the reduced heat generation can ensure that the material will not be damaged prematurely due to thermal aging during the use of the tire; the volume resistance of the rubber composition in Examples 1 to 4 is reduced compared with that in Comparative Examples 1 to 2, especially the volume resistance of the rubber composition in Examples 1 to 3 is reduced by 40%-71% compared with that in Comparative Examples 1 to 2, which is extremely The antistatic performance of the tire is greatly improved, and the static electricity accumulation of the equipment during use and the occurrence of safety accidents are avoided; the Akron wear of the rubber composition in Examples 1 to 4 is reduced by 20%-25% compared with the wear of Comparative Examples 1 to 2, and the improved wear performance makes the tire more wear-resistant during use and extends the service life; the 60°C thermal conductivity of the rubber composition in Examples 1 to 4 is increased by 13%-23% compared with Comparative Examples 1 to 2, and the improved thermal conductivity can timely guide the heat accumulated during use, avoiding the failure damage caused by the performance degradation due to heat accumulation inside the tire.

[0147] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rubber composition for a tire, characterized in that: It comprises the following components in parts by weight: 60-70 parts of smoked sheet rubber, 10-20 parts of solution-polymerized styrene-butadiene rubber, 20-30 parts of neodymium-based butadiene rubber, 125-130 parts of reinforcing material, 1-2 parts of silane coupling agent, 2-3 parts of microcrystalline wax, 2-3 parts of tear-resistant resin, 5-10 parts of zinc oxide, 1-2 parts of stearic acid, 2-6 parts of antioxidant, 1-2 parts of insoluble sulfur, 1-2 parts of accelerator, and 0.1-1 part of scorch retarder.

2. The tire rubber composition according to claim 1, wherein The molecular weight of the tobacco sheet glue is 10 6 ~10 7 .

3. The tire rubber composition according to claim 1, wherein The cis mass content of the neodymium-based butadiene rubber is greater than 98%.

4. The tire rubber composition according to claim 1, wherein The mass content of styrene in the solution polymerized styrene-butadiene rubber is 20% to 22%.

5. The tire rubber composition according to any one of claims 1 to 4, characterized in that: The reinforcing material includes at least one of white carbon black, carbon black and conductive carbon black.

6. The tire rubber composition according to claim 5, wherein The reinforcing material comprises the following components in parts by weight: 6 to 10 parts of white carbon black, 100 to 110 parts of carbon black, and 5 to 10 parts of conductive carbon black.

7. The tire rubber composition according to any one of claim 5, characterized in that: The carbon black includes carbon black N134 and / or carbon black N234; And / or, the silane coupling agent includes Si75 and / or Si69; And / or, the antioxidant includes antioxidant RD and / or antioxidant 4020; And / or, the accelerator includes accelerator D and / or accelerator NS; And / or, the anti-scorch agent includes anti-scorch agent CTP And / or, the tear-resistant resin includes dicyclopentadiene resin.

8. A method for preparing a tire rubber composition as claimed in any one of claims 6 to 7, characterized in that: The following steps are involved: Mixing the tobacco sheet rubber and part of the carbon black in a first internal mixer, and draining the rubber to obtain tobacco sheet rubber carbon black plasticized rubber; Adding smoked sheet rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, remaining carbon black, bio-based white carbon black, conductive carbon black, zinc oxide, stearic acid, silane coupling agent, microcrystalline wax, antioxidant, and tear-resistant resin into the second internal mixer, mixing, discharging the rubber, and extruding into the extruder to obtain a masterbatch mixed rubber; The masterbatch rubber, insoluble sulfur, accelerator and scorch retarder are added into the third internal mixer, mixed, discharged to an open mixer, turned over, and the final rubber is obtained, which is the rubber composition for tires.

9. The method for preparing the rubber composition for tire according to claim 8, characterized in that: The following steps are involved: The speed of the first internal mixer is set to 50-60 rpm, the tobacco sheet glue is put into the first internal mixer, and the top bolt is pressed for 60-70 seconds; the top bolt is raised, and carbon black with a mass fraction of 30-40% is added, and the top bolt is pressed. When the temperature of the rubber material rises to 130-140° C., the top bolt is raised and maintained for 20-30 seconds, the speed of the first internal mixer is adjusted to 40-50 rpm, the top bolt is pressed, and when the temperature of the rubber material rises to 150-155° C., the rubber is discharged to obtain tobacco sheet glue carbon black plasticized rubber; Set the speed of the second internal mixer to 40-45rpm, add smoked rubber carbon black plasticized rubber, neodymium-based butadiene rubber, solution polymerized styrene butadiene rubber, the remaining carbon black, bio-based white carbon black, conductive carbon black, zinc oxide, stearic acid, silane coupling agent, microcrystalline wax, antioxidant, tear-resistant resin into the second internal mixer, press the top bolt for 30-40s; raise the top bolt, keep it for 10-20s, press the top bolt, wait for the temperature of the rubber material to rise to 130-140℃; raise the top bolt, keep it for 10-20s, press the top bolt, mix to 153-155℃, reduce the speed of the second internal mixer to 5-10rpm, mix for 50-60s, discharge the rubber, enter the extruder for extrusion, roll the sheet, cool to 40℃-45℃, park for 8h-24h, and obtain the masterbatch rubber; The speed of the third internal mixer is set to 15-20rpm, the masterbatch, insoluble sulfur, accelerator and scorch retarder are added to the third internal mixer, the top bolt is pressed, mixing is carried out to 90-100°C, the top bolt is lifted and held for 5-10s, the top bolt is pressed, mixing is carried out to 100-110°C, and the material is discharged to the open mixer; the roller temperature of the open mixer is raised to 70-80°C, the rubber is turned on the open mixer, and after the rubber is turned over and wrapped around the roller, it is unrolled, cooled to 40-45°C, and left for 8h-24h to obtain the final rubber mixture, which is the rubber composition for tires.

10. Use of the rubber composition for tires according to any one of claims 1 to 7 or the rubber composition for tires according to any one of claims 8 or 9 in preparing tires for unmanned transport vehicles.

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