Tread rubber composition for all-steel truck radial tire driving wheel, driving tire tread rubber and preparation method of driving tire tread rubber

Abstract

The invention belongs to the technical field of tire rubber material preparation, and relates to a tread rubber composition for a driving wheel of an all-steel truck radial tire, driving tire tread rubber and a preparation method of the driving tire tread rubber, and the tread rubber composition comprises 50-75 parts of natural rubber, 15-25 parts of butadiene-isoprene rubber, 10-25 parts of MGA-30 rubber, 30-40 parts of carbon black, 10-20 parts of white carbon black with an ultrahigh specific surface area, 1.5-3 parts of stearic acid and 3-5 parts of indirect method zinc oxide. The invention relates to a high-temperature-resistant rubber material which is prepared from the following components in parts by weight: 1.2-2.4 parts of liquid silane, 0.4-0.8 part of a white carbon black improved dispersant, 0.5-2 parts of a novel vulcanizing agent, an anti-aging agent, protective wax, sulfur powder, an accelerant CZ and a scorch retarder CTP. The tread rubber prepared by the invention is used for a driving wheel tire of an all-steel truck radial tire, so that the wet skid resistance and the wear resistance are remarkably improved, the rolling resistance is reduced, the synchronous optimization of the driving safety, the wear resistance and the oil saving property of a vehicle is realized, and the service life is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of tire rubber compound preparation technology, specifically relating to a tread rubber composition for all-steel radial truck tire drive wheels, a drive tire tread rubber, and a method for preparing the same. Background Technology

[0002] All-steel radial truck tires are mainly used in freight and passenger vehicles. Based on their installation position on the vehicle, they can be divided into guide wheels, drive wheels, and trailer wheels. The function of the drive wheels is to transmit the torque output from the vehicle's engine or electric motor to the ground through the transmission system (such as a gearbox or driveshaft), generating traction (friction) to propel the vehicle forward or backward. The adhesion between the drive wheels and the road surface directly affects the vehicle's acceleration efficiency, as well as its performance in areas such as hill climbing and grip on wet surfaces. Besides the tread pattern, the performance of the drive wheels is most directly affected by the tire's tread rubber. The tread rubber affects the tire's grip on the ground, especially in wet conditions; insufficient grip and increased braking distance directly impact driving safety. Furthermore, the drive wheels account for a significantly higher proportion of energy consumption than guide wheels and trailer wheels. Taking a 6×4+3T tractor-trailer as an example, of the energy consumed by the tires, the drive wheels account for 50%, the trailer wheels 35%, and the guide wheels 15%. This is because the drive wheels are the primary working wheels and contribute the most to the vehicle's rolling resistance.

[0003] The tread compound accounts for 40-50% of the rolling resistance of the drive wheel tire. Improving the rolling resistance of the drive wheel mainly starts with the tread compound. Meanwhile, since the drive wheel is the primary working wheel, its wear resistance determines its service life. Excellent wear resistance can extend its service life, bringing economic value to customers. When the rolling resistance of the drive wheel is high, the tread compound generates more heat. During long-distance driving, especially in high summer temperatures, the tire may experience rubber aging due to heat, leading to shoulder gaps, crown delamination, and even tire blowouts, posing certain safety hazards.

[0004] The inventor previously applied for Chinese patent CN118222016A for the tread compound formulation of guide wheels, providing a tread compound composition specifically for guide wheels and a method for preparing guide tire tread compound, used to reduce the hardness of the guide wheel tread compound, ensure wear resistance, and reduce the heat generation problem of the guide wheel compound. However, there is no tread compound formulation design for drive wheels. How to reduce the rolling resistance of drive wheels to reduce fuel consumption, reduce the heat generation problem of drive tire tread compound to reduce failures, improve wet skid resistance to improve driving safety, ensure wear resistance and extend tire life are technical problems that urgently need to be solved by those skilled in the art, and this is also the "devil's triangle" that plagues the industry.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems existing in the prior art. It proposes a tread rubber composition for all-steel radial truck tire drive wheels, a drive tire tread rubber and its preparation method. By designing the combination of raw materials for the tread rubber composition, and controlling the feeding sequence and mixing temperature according to the distribution characteristics of different materials in rubber, a staged feeding process of raw rubber, filler and additives is adopted to ensure the reactivity of the mixing process and the distribution of filler in the three types of raw rubber.

[0007] The drive wheel prepared by this invention significantly improves vehicle driving safety, enhances wet skid resistance, extends service life, improves tire wear resistance, reduces fuel consumption, and reduces rolling resistance, achieving simultaneous optimization of safety, wear resistance, and fuel economy.

[0008] The technical solution of this invention is: This invention provides a tread compound composition for drive wheels of all-steel radial truck tires, comprising the following components in parts by weight: 50-75 parts of natural rubber, for example, 50, 52, 55, 57, 60, 63, 65, 68, 70, 75 parts, or any number within the range of 50-75 parts; 15-25 parts of PVC-Butadiene rubber, for example, 15, 18, 20, 23, 25 parts, or any number within the range of 15-25 parts; 10-25 parts of MGA-30 rubber, for example, 10, 13, 15, 18, 20, 22, 25 parts, or any number within the range of 10-25 parts. 30-40 parts of carbon black, for example, it can be any number of parts within the range of 30, 33, 35, 38, 40, or 30-40 parts; 10-20 parts of ultra-high specific surface area silica, for example, it can be any number of parts within the range of 10, 12, 13, 15, 17, 20, or 10-20 parts. Stearic acid 1.5-3 parts, for example, can be any number of parts within the range of 1.5 parts, 1.7 parts, 2 parts, 2.2 parts, 2.5 parts, 3 parts, or 1.5-3 parts; indirect zinc oxide 3-5 parts, for example, can be any number of parts within the range of 3 parts, 3.2 parts, 3.5 parts, 3.7 parts, 4 parts, 4.2 parts, 4.5 parts, 5 parts, or 3-5 parts. Antioxidant RD: 1-2 parts, for example, it can be any number of parts within the range of 1 part, 1.2 parts, 1.4 parts, 1.5 parts, 1.7 parts, 2 parts, or 1-2 parts; Antioxidant 4020: 1.5-3 parts, for example, it can be any number of parts within the range of 1.5 parts, 1.7 parts, 2 parts, 2.2 parts, 2.5 parts, 3 parts, or 1.5-3 parts. Protective wax 1-2 parts, for example, it can be any number of parts within the range of 1 part, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 2 parts, or 1-2 parts; liquid silane 1.2-2.4 parts, for example, it can be any number of parts within the range of 1.2 parts, 1.5 parts, 1.8 parts, 2.0 parts, 2.2 parts, 2.4 parts, or 1.2-2.4 parts; silica-modified dispersant 0.4-0.8 parts, for example, it can be any number of parts within the range of 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, or 0.4-0.8 parts. Sulfur powder 1-1.5 parts, for example, can be 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, or any number of parts within the range of 1-1.5 parts; Accelerator CZ 1-2.0 parts, for example, can be 1 part, 1.2 parts, 1.4 parts, 1.5 parts, 1.7 parts, 2 parts, or any number of parts within the range of 1-2 parts; Anti-scorching agent CTP 0.1-0.4 parts, for example, can be 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, or any number of parts within the range of 0.1-0.4 parts; New type of vulcanizing agent 0.5-2 parts, for example, can be 0.5 parts, 0.8 parts, 1.0 parts, 1.2 parts, 1.5 parts, 1.7 parts, 2 parts, or any number of parts within the range of 0.5-2 parts.

[0009] Preferably, the tread rubber composition comprises the following components in parts by weight: 55-70 parts natural rubber, 20-25 parts butyl ester rubber, 10-20 parts MGA-30 rubber, 35-40 parts carbon black, 10-15 parts ultra-high specific surface area silica, 1.5-2.5 parts stearic acid, 3.5-4.5 parts indirect zinc oxide, 1-1.5 parts antioxidant RD, 1.5-2.5 parts antioxidant 4020, 1-1.5 parts protective wax, 1.2-1.8 parts liquid silane, 0.4-0.6 parts silica-modified dispersant, 1-1.5 parts sulfur powder, 1-1.5 parts accelerator CZ, 0.15-0.30 parts scorching inhibitor CTP, and 0.5-1.5 parts novel vulcanizing agent.

[0010] More preferably, the composition includes 60 parts natural rubber, 20 parts butyl ester rubber, 20 parts MGA-30 rubber, 35 parts carbon black, 15 parts ultra-high specific surface area silica, 2.0 parts stearic acid, 3.5 parts indirect zinc oxide, 1.5 parts antioxidant RD, 2.0 parts antioxidant 4020, 1 part protective wax, 1.8 parts liquid silane, 0.6 parts silica modified dispersant, 1.0 part sulfur powder, 1.5 parts accelerator CZ, 0.15 parts scorching inhibitor CTP, and 1.0 part novel vulcanizing agent.

[0011] More preferably, the composition includes 70 parts natural rubber, 15 parts butyl ester rubber, 15 parts MGA-30 rubber, 40 parts carbon black, 10 parts ultra-high specific surface area silica, 2.0 parts stearic acid, 3.5 parts indirect zinc oxide, 1.0 part antioxidant RD, 2.0 parts antioxidant 4020, 1 part protective wax, 1.2 parts liquid silane, 0.4 parts silica modified dispersant, 1.2 parts sulfur powder, 1.4 parts accelerator CZ, 0.25 parts scorching inhibitor CTP, and 1.2 parts novel vulcanizing agent.

[0012] Furthermore, the natural rubber is one or more of smoked sheet rubber RSS3#, 10# standard rubber, and 20# standard rubber.

[0013] Furthermore, the butyl pentadiene rubber is iron-based comb-branched butyl pentadiene rubber (BIR), which is polymerized from isoprene and butadiene; wherein the propylene (wt%) content is 68%, the vinyl (wt%) content is 52%, the MW (kg / mol) is 3180, the Mooney viscosity ML(1+4) at 100℃ is 82, and the glass transition temperature Tg is -18 / -26℃.

[0014] Furthermore, the MGA-30 rubber is a modified natural rubber, which is made by grafting methyl methacrylate onto the side groups of natural rubber with a grafting rate of 30±2%, increasing the rigidity of the molecular chain. The Mooney viscosity MS(1+4) at 100℃ is ≤110, and the glass transition temperature Tg is -57℃.

[0015] Furthermore, the ultra-high specific surface area silica refers to BET 235±20 m³ / s. 2 / g of silica.

[0016] Furthermore, the carbon black selected is BL109, which has a nitrogen adsorption specific surface area (N2SA) of 140 ± 5 m². 2 / g, DBP oil absorption value is 135±5 ml / 100 g.

[0017] Furthermore, the liquid silane is selected from Bis-(3-triethoxysilylpropyl)-tetrasulfide (Si69) with a sulfur content of 22.5%; its amount is 12% of the weight of ultra-high specific surface area silica.

[0018] Furthermore, the silica-modifying dispersant refers to SL-5048, a mixture of high molecular weight alkylamine and stearate, wherein the mass ratio of high molecular weight alkylamine to stearate is 50:50; the amount of SL-5048 is 4% of the weight of ultra-high specific surface area silica.

[0019] Furthermore, the novel vulcanizing agent refers to the novel vulcanizing agent ARC, which is a polymer compound containing a bismaleimide structure. It can chemically crosslink with the double bonds in diene rubber to form CC bonds, and has high thermal stability and rigidity.

[0020] The present invention also provides a method for preparing the aforementioned tread rubber composition, comprising the following steps: (1) Weigh each component according to the weight parts, add the weighed natural rubber, stearic acid, antioxidant, ultra-high specific surface area silica, liquid silane, silica modifier dispersant, and 1 / 3 of the amount of carbon black into the internal mixer, speed 50 rpm, top jack pressure 0.45-0.55 MPa, mix for 30 seconds, clean and mix for 20 seconds; adjust the speed to 40 rpm, mix for 30 seconds, discharge the rubber, control the discharge temperature to 150-160℃, extrude the sheet into sheets, cool and stack to obtain a first-stage masterbatch; (2) Add the prepared first-stage masterbatch rubber, weighed butyl rubber, MGA-30 rubber, indirect zinc oxide and the remaining 2 / 3 of the carbon black into the internal mixer, adjust the speed to 50 rpm, mix for 30 seconds, clean and mix for 25 seconds, discharge the rubber, control the discharge temperature to 150-160℃, extrude the sheet into sheets, cool and stack to obtain the second-stage masterbatch rubber. (3) Add the second-stage masterbatch to the internal mixer, rotate at 42 rpm, mix for 30 seconds, clean and mix for 30 seconds, discharge the rubber, control the discharge temperature at 150-155℃, extrude the sheet with an extruder, cool and stack to obtain the third-stage masterbatch. (4) Add the three-stage masterbatch rubber, weighed sulfur powder, accelerator CZ, anti-scorching agent CTP and new vulcanizing agent to the internal mixer, adjust the speed to 28 rpm, mix for 30 seconds, clean and mix for 30 seconds, raise the top bolt, press the top bolt and mix for 30 seconds, discharge the rubber, control the discharge temperature to 100-115℃, sheet it out of the open mill, cool and stack it to obtain the final rubber.

[0021] In the above preparation method, the first stage masterbatch contains natural rubber, stearic acid, antioxidant, ultra-high specific surface area silica, liquid silane, silica modifier and dispersant, and 1 / 3 of the carbon black. The second stage masterbatch contains butyl rubber, MGA-30 rubber, indirect zinc oxide, and the remaining 2 / 3 of the carbon black. This is because natural rubber and silica are non-polar and polar materials, respectively, and have poor compatibility. Pre-mixing and contacting natural rubber with silica, silane, and silica modifier and dispersant can increase the dispersion and bonding time between silica and natural rubber, and increase the degree of silanization reaction. The addition of butyl rubber and MGA-30 in the second stage is because they are slightly polar and have better bonding with silica and carbon black, avoiding excessive filler dispersion in these two rubber compounds, which would result in a lack of reinforcing agents in the natural rubber. This mixing and feeding sequence can form a good phase distribution of reinforcing fillers in the three types of rubber. The staged addition of zinc oxide and silica by indirect method can avoid the adsorption effect of silica on zinc oxide. The addition of the new vulcanizing agent in the final rubber mixing stage can prevent the new vulcanizing agent from cross-linking with the rubber prematurely under high temperature mixing.

[0022] The present invention provides a tread compound for an all-steel radial truck tire, wherein the tread compound is prepared using any of the tread compound compositions described above.

[0023] The present invention also provides the application of the tread rubber composition described herein or the tread rubber composition prepared by the method described herein in the preparation of drive wheel tires.

[0024] Furthermore, the tire is a drive wheel tire among all-steel radial truck tires.

[0025] The present invention also provides the application of the tread compound in the preparation of all-steel radial truck tires and drive wheels.

[0026] The beneficial effects of this invention are: (1) The drive wheel prepared by using the tread rubber composition provided by the present invention significantly improves vehicle driving safety (improved wet skid resistance of tread rubber), wear resistance (improved wear resistance of tread rubber), and fuel economy (reduced rolling resistance of tread rubber).

[0027] (2) The tread rubber composition of the present invention has optimized the raw rubber system based on the original tread composition which uses natural rubber as raw rubber, and added the use of a new synthetic rubber, butadiene rubber (BIR). Butadiene rubber is polymerized from isoprene and butadiene. Since the propylene group (wt%) content in the butadiene rubber molecule is 68% and the vinyl group (wt%) content is 52%, these large number of side groups give butadiene rubber excellent anti-skid performance. At the same time, since butadiene is introduced into the rubber molecular chain in the butadiene rubber by copolymerization, butadiene rubber has the same wear resistance as butadiene rubber. This invention introduces pentadiene rubber (iron-based combed pentadiene rubber BIR) into the tread formulation of drive tires, resulting in a dual improvement in wet skid resistance and abrasion resistance. At the same time, it also introduces modified natural rubber MGA-30, which is made by grafting methyl methacrylate onto the side groups of natural rubber with a grafting rate of 30±2%, increasing the rigidity of the molecular chain. The introduction of MGA-30 containing rigid molecular chains can reduce the amount of reinforcing agent used while achieving the same modulus, thereby reducing the hysteresis loss of the rubber compound, reducing rolling resistance, and improving abrasion resistance.

[0028] (3) The tread rubber composition of the present invention uses a variety of functional additives. The use of liquid silane Si69 solves the problem of the wear caused by the use of N330 in solid silane coupling agent, and ensures the degree of silanization reaction on the surface of silica. The silica modified dispersant SL-5048 can improve the problem of dispersion of ultra-high specific surface area silica, reduce filler agglomeration, and make it truly achieve high dispersion and high wear resistance. The novel vulcanizing agent ARC can chemically crosslink with the double bonds in diene rubber to form CC bonds. At the same time, since the crosslinking bond is longer than that of ordinary monosulfide and disulfide, it has good flexibility and high thermal stability, rigidity and fatigue resistance, which can improve the wear resistance and cut resistance of the tread rubber and reduce heat generation.

[0029] (4) The tread rubber composition of the present invention has optimized the reinforcing system and uses ultra-high specific surface area silica with BET 235±20㎡ / g. Compared with the silica used in the prior art with BET 185±15㎡ / g, ultra-high specific surface area silica has wear resistance similar to ordinary high specific surface area carbon black, while improving tear resistance and cut resistance. The carbon black used is high structure high specific surface area carbon black BL109. Compared with carbon black N205 and other carbon blacks used in the prior art, carbon black BL109 provides ultra-high wear resistance. Attached Figure Description

[0030] Figure 1 The RPA test results provided by this invention. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To further understand the present invention, it will be further described in conjunction with the accompanying drawings and embodiments.

[0033] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available. Example

[0034] This embodiment provides a tread compound composition for an all-steel radial truck tire drive wheel, comprising the following components in parts by weight: Natural rubber 60 parts, butyl ester rubber 20 parts, MGA-30 rubber 20 parts, carbon black 35 parts, ultra-high specific surface area silica 15 parts, stearic acid 2.0 parts, indirect zinc oxide 3.5 parts, antioxidant RD 1.5 parts, antioxidant 4020 2.0 parts, protective wax 1 part, liquid silane 1.8 parts, silica modifier dispersant 0.6 parts, sulfur powder 1.0 part, accelerator CZ 1.5 parts, scorching inhibitor CTP 0.15 parts, new vulcanizing agent 1.0 part.

[0035] The method for preparing the tread rubber composition includes the following steps: First, weigh out each component according to the weight ratio to prepare the tread compound composition for all-steel radial truck tires; (1) First stage of masterbatch: Weigh the natural rubber, stearic acid, antioxidant, ultra-high specific surface area silica, liquid silane, silica modifier and dispersant, and 1 / 3 of the amount of carbon black into the internal mixer. Adjust the speed of the internal mixer to 50 rpm, the pressure of the top plug to 0.5 MPa, press the top plug and mix for 30 seconds, raise the top plug to clean, press the top plug and mix for 20 seconds, raise the top plug, adjust the speed of the internal mixer to 40 rpm, press the top plug and mix for 30 seconds, raise the top plug, open the discharge door to discharge the rubber, control the discharge temperature to 155℃, extrude the sheet into the extruder, cool and stack it. (2) Second stage masterbatch: Add the first stage masterbatch, butadiene rubber, MGA-30 rubber, indirect zinc oxide and the remaining 2 / 3 of the carbon black to the internal mixer, adjust the speed of the internal mixer to 50 rpm, press the top plug and mix for 30 seconds, raise the top plug to clean for 5 seconds, press the top plug and mix for 25 seconds, open the discharge door to discharge the rubber, control the discharge temperature to 155℃, extrude the sheet with the extruder, cool and stack it; (3) Three-stage masterbatch: The two-stage masterbatch is added to the internal mixer. The speed of the internal mixer is adjusted to 42 rpm. The top bolt is pressed and mixed for 30 seconds. The top bolt is raised and cleaned for 5 seconds. The top bolt is pressed and mixed for 30 seconds. The discharge door is opened to discharge the rubber. The discharge temperature is controlled at 152℃. The extruder extrudes the sheets and cools and stacks them. (4) Final mixing: Add the three-stage masterbatch rubber, sulfur powder, accelerator CZ, anti-scorching agent CTP and new vulcanizing agent to the internal mixer, adjust the speed of the internal mixer to 28 rpm, press the top bolt and mix for 30 seconds, raise the top bolt and clean for 5 seconds, press the top bolt and mix for 30 seconds, raise the top bolt, press the top bolt and mix for 30 seconds, raise the top bolt, open the discharge door to discharge the rubber, control the discharge temperature to 110℃, open the mill to remove the sheet, cool and stack it.

[0036] The tread compound prepared using the above-mentioned tread compound composition formulation will be used to prepare all-steel radial truck tires and drive wheels. Example

[0037] This embodiment provides a tread compound composition for an all-steel radial truck tire drive wheel, comprising the following components in parts by weight: Natural rubber 70 parts, butyl ester rubber 15 parts, MGA-30 rubber 15 parts, carbon black 40 parts, ultra-high specific surface area silica 10 parts, stearic acid 2.0 parts, indirect zinc oxide 3.5 parts, antioxidant RD 1.0 part, antioxidant 4020 2.0 parts, protective wax 1 part, liquid silane 1.2 parts, silica modifier dispersant 0.4 parts, sulfur powder 1.2 parts, accelerator CZ 1.4 parts, scorching inhibitor CTP 0.25 parts, new vulcanizing agent 1.2 parts.

[0038] The preparation method is the same as in Example 1.

[0039] The tread compound prepared using the above-mentioned tread compound composition formulation will be used to prepare all-steel radial truck tires and drive wheels. Example

[0040] This embodiment provides a tread compound composition for an all-steel radial truck tire drive wheel, comprising the following components in parts by weight: Natural rubber 65 parts, butyl ester rubber 20 parts, MGA-30 rubber 16 parts, carbon black 35 parts, ultra-high specific surface area silica 15 parts, stearic acid 2.2 parts, indirect zinc oxide 4 parts, antioxidant RD 1.5 parts, antioxidant 4020 2.2 parts, protective wax 1.5 parts, liquid silane 1.8 parts, silica modifier dispersant 0.6 parts, sulfur powder 1.2 parts, accelerator CZ 1.5 parts, scorching inhibitor CTP 0.3 parts, new vulcanizing agent 1.2 parts.

[0041] The preparation method is the same as in Example 1.

[0042] The tread compound prepared using the above-mentioned tread compound composition formulation will be used to prepare all-steel radial truck tires and drive wheels.

[0043] Comparative Example 1 The common tread rubber composition, by weight, comprises: 100 parts of natural rubber STR20, 0.2 parts of plasticizer, 50 parts of carbon black N205, 2.5 parts of stearic acid, 3.5 parts of indirect zinc oxide, 2 parts of tear-resistant resin, 1.5 parts of antioxidant 4020, 1 part of antioxidant RD, 1 part of protective wax, 1.3 parts of accelerator NS, 1.5 parts of sulfur powder, and 0.2 parts of scorching inhibitor CTP.

[0044] The preparation method of the ordinary tread rubber composition in Comparative Example 1 is to prepare the tread rubber according to the conventional tread composition preparation method in the prior art, namely: first stage of adding all raw rubber components of masterbatch, second stage of reverse refining, third stage of re-refining, and final refining process.

[0045] Experiment 1 Performance Testing The drive tire tread compounds prepared in Examples 1 and 2 of this invention, and the ordinary tread compound prepared in Comparative Example 1, were subjected to physical property tests under different vulcanization conditions. The performance values ​​of each tread compound were measured, and the test results are shown in Tables 1 to 3. Figure 1 As shown.

[0046] Table 1 shows the physical properties test results after vulcanization at 150℃ for 30 min; Table 2 shows the test results of vulcanizer, Mooney viscosity, and Mooney scorch data; Table 3 shows the DMA test results.

[0047] The test results show that the drive tire surface compound formulated according to this invention, when used in all-steel radial truck tires, has the following main performance advantages: The aging resistance coefficient of the driving tire surface rubber is increased by 24-26%, which is beneficial to the longevity of tire service life and the guarantee of wear resistance in the later stage. The composition of this invention improves the two main methods of characterizing the wear resistance of tires and rubber compounds, namely DIN abrasion and Akron abrasion, to varying degrees. The volume of DIN abrasion is reduced by 12-15%, and the volume of Akron abrasion is reduced by 17-22%, indicating that the tire wear resistance is significantly improved.

[0048] The rubber compound DMA test, vulcanized rubber temperature scan, and the index 0℃ Tanδ characterizing the rubber compound's wet skid resistance, the higher the value, the better the wet skid resistance. The composition of this invention improves wet skid resistance by 10.0-13.3% compared to the normal control composition. Improved wet skid resistance can reduce braking distance on wet roads and improve driving safety. The index 60℃ Tanδ characterizes the heat generation of the rubber compound. The lower the value, the lower the hysteresis loss. Lower heat generation means lower rolling resistance. The composition of this invention reduces rolling resistance by 20.0-21.6% compared to the normal control composition. Reduced heat generation results in lower tire operating temperature and improves tire operating safety. Reduced rolling resistance can reduce fuel consumption during driving.

[0049] Table 1. Test results of physical properties after vulcanization at 150℃ for 30 min

[0050] Table 2. Test results of vulcanizer, Mooney viscosity, and Mooney scorch data.

[0051] Table 3 DMA Test Results

[0052] Strain scanning of uncured rubber by RPA (see Table 4 and...) Figure 1 The Payne effect characterizing carbon black dispersion was significantly improved. In the strain scan of the uncured rubber, the G' range was smaller. The composition of the present invention (the drive tire tread rubber prepared in Examples 1 and 2) was actually 58.94~61.79% of the normal comparative composition (tread rubber of Comparative Example 1). This shows that the manufacturing process of the invention can significantly improve the dispersibility of carbon black and silica, and the process has obvious advantages.

[0053] Table 4

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, alterations, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tread compound composition for drive wheels of all-steel radial truck tires, characterized in that, The product comprises the following components in parts by weight: 50-75 parts natural rubber, 15-25 parts butyl ester rubber, 10-25 parts MGA-30 rubber, 30-40 parts carbon black, 10-20 parts ultra-high specific surface area silica, 1.5-3 parts stearic acid, 3-5 parts indirect zinc oxide, 1-2 parts antioxidant RD, 1.5-3 parts antioxidant 4020, 1-2 parts protective wax, 1.2-2.4 parts liquid silane, 0.4-0.8 parts silica modifier dispersant, 1-1.5 parts sulfur powder, 1-2.0 parts accelerator CZ, 0.1-0.4 parts scorching inhibitor CTP, and 0.5-2 parts novel vulcanizing agent.

2. The tread rubber composition according to claim 1, characterized in that, The natural rubber is one or more of smoked sheet rubber RSS3#, 10# standard rubber, and 20# standard rubber; the PVC-butadiene rubber is iron-based PVC-butadiene rubber BIR.

3. The tread rubber composition according to claim 1, characterized in that, The MGA-30 rubber is a modified natural rubber, which is made by grafting methyl methacrylate onto the side groups of natural rubber with a grafting rate of 30±2%. The Mooney viscosity MS(1+4) at 100℃ is ≤110 and the glass transition temperature is -57℃.

4. The tread rubber composition according to claim 1, characterized in that, The ultra-high specific surface area silica refers to BET 235±20 m 2 / g of silica; The carbon black used is BL109, with an N2SA of 140±5 μm. 2 / g, DBP oil absorption value is 135±5 ml / 100 g.

5. The tread rubber composition according to claim 1, characterized in that, The liquid silane used is Si69, and its amount is 12% of the weight of ultra-high specific surface area silica. The modified dispersant for silica is SL-5048, in which the mass ratio of high molecular weight alkylamine to stearate is 50:50; the amount of SL-5048 used is 4% of the weight of ultra-high specific surface area silica. The new type of vulcanizing agent is vulcanizing agent ARC.

6. A method for preparing the tread rubber composition according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Weigh each component according to the weight parts, add the weighed natural rubber, stearic acid, antioxidant, ultra-high specific surface area silica, liquid silane, silica modifier dispersant, and 1 / 3 of the amount of carbon black into the internal mixer, speed 50 rpm, top jack pressure 0.45-0.55 MPa, mix for 30 seconds, clean and mix for 20 seconds; adjust the speed to 40 rpm, mix for 30 seconds, discharge the rubber, control the discharge temperature to 150-160℃, extrude the sheet into sheets, cool and stack to obtain a first-stage masterbatch; (2) Add the prepared first-stage masterbatch rubber, weighed butyl rubber, MGA-30 rubber, indirect zinc oxide and the remaining 2 / 3 of the carbon black into the internal mixer, adjust the speed to 50 rpm, mix for 30 seconds, clean and mix for 25 seconds, discharge the rubber, control the discharge temperature to 150-160℃, extrude the sheet into sheets, cool and stack to obtain the second-stage masterbatch rubber. (3) Add the second-stage masterbatch to the internal mixer, rotate at 42 rpm, mix for 30 seconds, clean and mix for 30 seconds, discharge the rubber, control the discharge temperature at 150-155℃, extrude the sheet with an extruder, cool and stack to obtain the third-stage masterbatch. (4) Add the three-stage masterbatch rubber, weighed sulfur powder, accelerator CZ, anti-scorching agent CTP and new vulcanizing agent to the internal mixer, adjust the speed to 28 rpm, mix for 30 seconds, clean and mix for 30 seconds, raise the top bolt, press the top bolt and mix for 30 seconds, discharge the rubber, control the discharge temperature to 100-115℃, sheet it out of the open mill, cool and stack it to obtain the final rubber.

7. A tread compound for an all-steel radial truck tire, characterized in that, The tread compound of the drive tire is prepared using the tread compound composition according to any one of claims 1-6.

8. The use of the tread compound composition according to any one of claims 1-5 or the tread compound composition prepared by the preparation method according to claim 6 in the preparation of drive wheel tires.

9. The application according to claim 8, characterized in that, The tire in question is a drive wheel tire among all-steel radial truck tires.

10. The application of the tread compound of claim 7 in the preparation of all-steel radial truck tires and drive wheels.

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