CN109851867B - Tire sidewall rubber composition, preparation method and application thereof - Google Patents
Tire sidewall rubber composition, preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a tire side wall rubber composition, a preparation method and application thereof, wherein a tire side wall prepared from the tire side wall rubber composition is suitable for a semisteel tire, and the high-performance black environment-friendly tire side wall has excellent bending property, higher breaking strength, excellent tearing strength, excellent surface fineness and brightness.
Description
Technical Field
The invention relates to the technical field of rubber products, and particularly relates to a tire side wall rubber composition, a preparation method and application thereof.
Background
The raw rubber system of the sidewall of the radial tire for semisteel is basically natural rubber and butadiene rubber, and the two types of rubber are diene rubber, so that various aging phenomena are easy to generate.
The diene rubber has double bonds, and C-H in the double bonds can be easily dissociated into active wave H atoms, so that thermooxidative aging and ozone aging are easy to occur. Fatigue aging refers to the condition of multiple deformations that rubber macromolecules are broken or oxidized, as a result, the physical properties and other properties of the rubber are deteriorated, and the use value is finally lost. The most prominent place where fatigue aging occurs is the sidewall of the tire. The tire undergoes repeated compression and expansion and continuous deformation every revolution, and fatigue aging occurs in this case.
The sidewall rubber composition is aged and deteriorated in the atmosphere, the function of ozone is a very important reason, the ozone aging is firstly generated on a surface layer, particularly easily generated at a stress concentration part or an interface of a compound particle and rubber, a film is usually generated firstly, then the film is cracked, particularly when a tire is used under a dynamic condition, the film is easy to break and continuously form and a fresh surface is exposed, so that the ozone aging is continuously developed deeply until the ozone aging is completely broken.
Whether thermal oxidative aging or ozone aging, special chemical and physical antioxidants can effectively retard the aging rate. However, when the anti-aging agent is applied properly and each time plays its own role, no related report on the black sidewall is available, wherein the performance and toughness of the rubber material are improved by a formula design, namely a nano modified mineral material and two kinds of carbon black and white carbon black with different specific surface areas, so that the service life of the tire is prolonged.
Disclosure of Invention
The invention aims to provide a tire side wall rubber composition, a preparation method and application thereof, wherein the tire side wall rubber composition is suitable for preparing a high-performance black environment-friendly side wall for a semisteel tire and has excellent performance.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a tire side wall rubber composition which comprises the following components in parts by weight: 30-70 parts of natural rubber, 30-70 parts of butadiene rubber, 20-40 parts of first carbon black, 10-30 parts of second carbon black, 5-20 parts of inorganic reinforcing filler, 5-20 parts of nano modified mineral material, 5-10 parts of environment-friendly aromatic oil, 1-3 parts of silane coupling agent, 1-3 parts of carbon black dispersing agent, 4-6 parts of hydrocarbon petroleum tackifying resin, 2-5 parts of resin modified asphalt, 2-4 parts of vulcanizing agent and vulcanization accelerator, 5-10 parts of vulcanization activator, 3-6 parts of anti-aging agent and 0.1-0.3 part of anti-scorching agent.
The invention also provides a preparation method of the tire side wall rubber composition, which comprises the following steps:
mixing natural rubber, butadiene rubber, hydrocarbon petroleum tackifying resin, resin modified asphalt, a silane coupling agent, a vulcanizing active agent, a carbon black dispersing agent and a nano modified mineral material; then mixing the mixture with first carbon black, inorganic reinforcing filler and environment-friendly aromatic oil, stirring uniformly, mixing for the first time, discharging rubber material to form a section of masterbatch,
mixing the first-stage masterbatch, the anti-aging agent and the vulcanization accelerator of the diphenylguanidine DPG, then mixing with the second carbon black, stirring uniformly, mixing in the second stage, discharging the rubber material to form second-stage masterbatch,
mixing the second-stage master batch, the scorch retarder, the vulcanizing agent and the vulcanization accelerator N-tert-butyl-2-benzothiazole sulfonamide TBBS, uniformly stirring, mixing in a third stage, and discharging the rubber material to obtain the tire side wall rubber composition.
The invention also provides a radial tire, which comprises a tire side wall prepared from the rubber composition.
The invention has the beneficial effects that:
the invention provides a tire sidewall rubber composition, a preparation method and application thereof, and the tire sidewall rubber prepared by the invention can ensure the physical properties of the semi-steel radial tire, such as hardness, elastic modulus and the like, and the matching requirements of the extrusion process, and simultaneously can improve the tearing strength of rubber materials and the toughness of the tire sidewall rubber. The occurrence of the cracks on the side wall of the tire in the using process is reduced, and the service life of the tire is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a graph showing the luminance of inorganic nanoparticles used in examples of the present invention as a function of particle size.
Fig. 2 is a schematic diagram of the toughening mechanism of the inorganic nanoparticles used in the examples of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following specifically describes a tire sidewall rubber composition, a preparation method and an application thereof provided by the embodiment of the invention.
The embodiment of the invention provides a tire side wall rubber composition which comprises the following components in parts by weight: 30-70 parts of natural rubber, 30-70 parts of butadiene rubber, 20-40 parts of first carbon black, 10-30 parts of second carbon black, 5-20 parts of inorganic reinforcing filler, 5-20 parts of nano modified mineral material, 5-10 parts of environment-friendly aromatic oil, 1-3 parts of silane coupling agent, 1-3 parts of carbon black dispersing agent, 4-6 parts of hydrocarbon petroleum tackifying resin, 2-5 parts of resin modified asphalt, 2-4 parts of vulcanizing agent and vulcanization accelerator, 5-10 parts of vulcanization activator, 3-6 parts of anti-aging agent and 0.1-0.3 part of anti-scorching agent.
The embodiment of the invention provides a tire side wall rubber composition, which takes natural rubber, butadiene rubber, hydrocarbon petroleum tackifying resin and resin modified asphalt as matrix components, improves the hardness and the elastic modulus of the novel tire side wall rubber composition, reduces the addition of carbon black, improves the extrusion performance of rubber materials, adds inorganic reinforcing filler and nano modified mineral materials to fill gaps among rubber particles, adds environment-friendly aromatic oil to increase the fusion among the matrix components, is also matched with components with dispersion and coupling performances such as a carbon black dispersing agent, a silane coupling agent and the like, and is matched with a specific anti-aging system, an anti-scorching system and a vulcanization system, so that the tire side wall thickness and the tire weight can be reduced, the deformation and the heat generation of a tire side wall are reduced, the rolling resistance of the tire is reduced, and the service life of the tire is prolonged.
The tire sidewall prepared from the composition can meet the matching requirements of the semi-steel radial tire on the physical properties of the sidewall such as hardness, elastic modulus and the like and the matching of an extrusion process, and meanwhile, the tear strength of a rubber material is improved, the toughness of the sidewall rubber is improved, the occurrence of sidewall cracks of the tire in the using process is reduced, and the service life of the tire is prolonged.
In some embodiments, a tire sidewall rubber composition comprises the following components in parts by weight: 45-65 parts of natural rubber, 35-55 parts of butadiene rubber, 25-35 parts of first carbon black, 15-25 parts of second carbon black, 8-15 parts of inorganic reinforcing filler, 8-16 parts of nano modified mineral material, 5-7 parts of environment-friendly aromatic oil, 1-2 parts of silane coupling agent, 1-2 parts of carbon black dispersing agent, 4-6 parts of hydrocarbon petroleum tackifying resin, 2-4 parts of resin modified asphalt, 2-3.5 parts of vulcanizing agent and vulcanizing accelerator, 5-7 parts of vulcanizing active agent, 4-6 parts of anti-aging agent and 0.1-0.25 part of anti-scorching agent.
In some embodiments, the first carbon black has a nitrogen adsorption specific surface area greater than 80m2A nitrogen adsorption specific surface area of less than 50m2The carbon black dispersant comprises a mixture of fatty acid zinc soap salts.
The first carbon black in the examples of the present invention had a nitrogen adsorption specific surface area of more than 80m2Second carbon per gramThe nitrogen adsorption specific surface area of the black is less than 50m2Preferably, the first carbon black has a nitrogen adsorption specific surface area of 80 to 120m2(ii)/g; the second carbon black has a nitrogen adsorption specific surface area of 31-44m2(ii) in terms of/g. More preferably, the first carbon black has a nitrogen adsorption specific surface area of 86 to 98m2The DBP oil absorption value is 109-119mL/100 g; the nitrogen adsorption specific surface area of the second carbon black is 36-44m2The DBP oil absorption value is 116-126mL/100 g. Two kinds of carbon black with different specific surface areas are selected and used together, so that the flowability of the rubber compound and the stiffness of the tire side extrusion process are ensured simultaneously. The first carbon black has excellent tear resistance and very long fatigue life; the second carbon black has strong fluidity, and gives the extruded sidewall good flatness and fineness.
In some embodiments, the inorganic reinforcing filler is white carbon, preferably white carbon having a BET specific surface area of 160-170m2The nano modified mineral material is anatase titanium dioxide or nano modified composite silicate, preferably, the average grain diameter of the anatase titanium dioxide is less than or equal to 1 mu m, preferably, SiO in the nano modified composite silicate2Not less than 40% of Al2O3The content is not less than 30 percent, and the average grain diameter is less than or equal to 2 mu m.
The inorganic reinforcing filler in the embodiment of the invention is white carbon black with BET specific surface area of 160-170m2The water-soluble polymer has a reinforcing effect and a certain adsorption effect.
The nano modified mineral material in the embodiment of the invention is anatase titanium dioxide or nano modified composite silicate. Wherein the average grain diameter of the anatase titanium dioxide is less than or equal to 0.3 mu m, and the anatase titanium dioxide has the advantages of strong covering power, sunlight resistance, no cracking, acid and alkali resistance, higher chemical stability and better weather resistance; SiO in nano modified composite silicate2Not less than 40% of Al2O3The content is not less than 30 percent, and the grain diameter is less than or equal to 0.6 mu m. The nano modified mineral material has small particle size, higher structure, good dispersibility and high elongation, mainly improves the toughness of the sidewall rubber, and plays a role in brightening and improving the appearance. Specific brightness as a function of particle size is shown in FIG. 1.
In the embodiment of the invention, the nano inorganic particles have the function of toughening and reinforcing in the polymer matrix, and the embodiment of the invention adopts a latest explanation mechanism, namely a crack and silver streak interconversion mechanism, which is explained as follows:
under the action of internal and external stress, the silver lines formed by the high molecular material can be further developed into destructive cracks in the absence of nano inorganic particles, so that the material is macroscopically broken; in the presence of inorganic nano particles, the inorganic nano particles enter the formed crack gaps, and a filamentous connection structure is formed by the acting force of the active surface and the active atom center of the inorganic nano particles and the macromolecular chains, so that the generated cracks are converted into a silver streak state. The crack is terminated and converted into a silver streak state to prolong the rupture of the high polymer material, so that more external energy or more stress is consumed to break the material, thereby improving the impact toughness and the tearing strength of the high polymer material.
When the content of the inorganic nanoparticles is too much and the polymer is formed to a certain size, the inorganic nanoparticles cannot enter the crack due to exceeding the internal gap of the crack, so that the crack cannot be converted into a silver streak state, and the inorganic nanoparticles play a stress concentration role to reduce the toughness and strength of the material, and a specific toughening schematic diagram of the inorganic nanoparticles is shown in fig. 2.
In some embodiments, the environment-friendly aromatic oil comprises at least one of environment-friendly aromatic oil Vivatec500 or environment-friendly aromatic oil DM420, and the resin modified asphalt is at least one of resin modified asphalt RT-40FE or resin modified asphalt CJ-100.
The resin modified asphalt in the embodiment of the invention is resin modified asphalt RT-40FE or resin modified asphalt CJ-100 and consists of cycloparaffin, straight-chain alkane and aromatic hydrocarbon. The material improves the compatibility of two phases of natural rubber and butadiene rubber, improves the physical and mechanical properties of the sidewall rubber composition in the embodiment of the invention, also improves the viscosity of the sidewall rubber composition, and meets the requirement of tire molding and fitting.
In some embodiments, the vulcanizing agent comprises sulfur, the vulcanization accelerator comprises at least one of N-tert-butyl-2-benzothiazolesulfenamide TBBS, diphenylguanidine DPG, and N-cyclohexyl-2-benzothiazolesulfenamide CBS, and the vulcanization activator comprises activated zinc oxide and stearic acid.
The vulcanization accelerator in the embodiment of the invention comprises at least one of N-tert-butyl-2-benzothiazole sulfonamide TBBS, diphenyl guanidine DPG and N-cyclohexyl-2-benzothiazole sulfonamide CBS. The vulcanization accelerator has the advantages of delayed effect, high vulcanization speed, long scorching time and abundant safe production time; the physical property of the product is reduced less after thermal oxidation aging, and the physical property retention rate is higher.
In some embodiments, the anti-aging agent comprises N- (1, 3-dimethylbutyl) -N' -phenyl-p-phenylenediamine 6PPD, 2, 4-trimethyl-1, 2-dihydroquinoline polymer TMQ and rhine wax and the scorch retarder comprises N-cyclohexylthiophthalimide CTP.
The antioxidant system in the examples of the present invention comprises N- (1, 3-dimethylbutyl) -N' -phenyl-p-phenylenediamine 6PPD, 2, 4-trimethyl-1, 2-dihydroquinoline polymer TMQ and rhine wax (a mixture of microcrystalline wax and paraffin wax). Wherein, the anti-aging agent TMQ can effectively prevent thermal aging, and the microcrystalline wax and the anti-aging agent 6PPD can effectively prevent ozone aging by combining the two physical and chemical anti-aging agents. The application of physical and chemical anti-aging systems is vital to the maintenance of the properties of the sidewall rubber. The anti-aging system can prevent aging and prevent aging from developing and strengthening, and improves the aging resistance of the rubber material.
The hydrocarbon petroleum tackifying resin used in the embodiment of the invention is selected from 201 tackifying resins, 203 tackifying resins and 204 tackifying resins are most commonly used in semi-steel tires, and 201 tackifying resin is preferred in the embodiment of the invention because 201 tackifying resin has good heat resistance, ozone resistance and adhesiveness. The silane coupling agent includes a commonly used silane coupling agent, preferably a silane coupling agent Si 69C.
The embodiment of the invention also provides a preparation method of the tire side wall rubber composition, which comprises the following steps:
mixing natural rubber, butadiene rubber, hydrocarbon petroleum tackifying resin, resin modified asphalt, a silane coupling agent, a vulcanizing active agent, a carbon black dispersing agent and a nano modified mineral material; then mixing the mixture with first carbon black, inorganic reinforcing filler and environment-friendly aromatic oil, stirring uniformly, mixing for the first time, discharging rubber material to form a section of masterbatch,
mixing the first-stage masterbatch, the anti-aging agent and the vulcanization accelerator of the diphenylguanidine DPG, then mixing with the second carbon black, stirring uniformly, mixing in the second stage, discharging the rubber material to form second-stage masterbatch,
mixing the second-stage master batch, the scorch retarder, the vulcanizing agent and the vulcanization accelerator N-tert-butyl-2-benzothiazole sulfonamide TBBS, uniformly stirring, mixing in a third stage, and discharging the rubber material to obtain the tire side wall rubber composition.
The embodiment of the invention also provides a preparation method of the tire side wall rubber composition, the workshop mixing process of the high-performance black environment-friendly tire side wall rubber composition for the semi-steel tire is different from the traditional two-stage mixing process of the tire side wall, a three-stage mixing process is adopted, and the filling coefficient of an internal mixer is designed to be 0.65-0.80. Because the filler used in the embodiment of the invention has more types, in order to ensure the best use of the materials and improve the dispersion uniformity of the filler, a three-stage mixing process is adopted. The two-stage mixing adopts a vulcanization accelerator DPG, the softening point of the vulcanization accelerator is about 140 ℃, the vulcanization accelerator can be better dispersed at a mixing temperature of the two-stage masterbatch, and the three-stage mixing adopts a vulcanization accelerator N-tert-butyl-2-benzothiazole sulfonamide TBBS, the softening point of the vulcanization accelerator is about 105 ℃, and the vulcanization accelerator can be better dispersed at a mixing temperature of the three-stage masterbatch.
In some embodiments, the step of one-stage mixing is as follows: the plug is lifted after the temperature of the plug is increased to 112-115 ℃ in 40-45s, the plug is lifted after the temperature of the plug is increased to 137-140 ℃ in 40-45s, finally the plug is pressed to 160-170 ℃ to remove the glue, the rotating speed is controlled at 40-50rpm,
the two-stage mixing steps are as follows: the plug is lifted after the temperature of the plug is increased to 102-105 ℃ in 40-50s, the plug is lifted after the temperature is increased to 122-125 ℃ in 35s, finally the plug is pressed to be removed when the temperature is increased to 140-150 ℃, the rotating speed is controlled at 30-40rpm,
the three-stage mixing steps are as follows: the plug is lifted after the temperature of the plug is increased to 92-95 ℃ for 30-40s, then the temperature of the plug is increased to 100-110 ℃ for 30-40s for glue discharging, and the rotating speed is controlled to be 25-30 rpm.
The embodiment of the invention also provides a radial tire which comprises a tire sidewall prepared from the rubber composition.
The embodiment of the invention also provides a radial tire which comprises a tire sidewall prepared from the rubber composition. The finished tire prepared from the tire side rubber composition in the embodiment of the invention can be stored for a longer period to generate a color change phenomenon, and the visual effect of the appearance of the tire side of the finished tire is obviously improved.
The features and properties of the present invention are described in further detail below with reference to examples.
The following table 1 shows the correspondence between the chinese names and the english abbreviations in the examples of the present invention:
TABLE 1 correspondence between Chinese names and English abbreviations of raw materials
The following table 2 is a table of formulations in examples 1 to 4 of the present invention and comparative examples 1 to 2:
TABLE 2 prescription Table
The following Table 3 shows the results of 160 ℃ 30min vulcanization, scorch and Mooney viscosity characteristics in examples 1 to 4 of the present invention and comparative examples 1 to 2:
TABLE 3-160 ℃ 30min vulcanization, scorch, Mooney viscosity characterization results
As can be seen from the above Table 3, the results of 160 ℃ 30min vulcanization, scorch and Mooney viscosity characteristics in inventive examples 1-4 are superior to the corresponding test results in comparative examples 1-2, and it can be seen that the vulcanization, scorch and Mooney characteristics of the sidewall rubber compositions in inventive examples 1-4 all satisfy the use quality requirements of the semi-steel radial sidewall rubber.
The following Table 4 shows the results of the physico-mechanical properties in examples 1 to 4 of the present invention and comparative examples 1 to 2:
TABLE 4 formulation physicomechanical Property results
As can be seen from Table 4, the physical and mechanical properties of the semi-steel radial tires of examples 1 to 4 can meet the quality and performance requirements of the semi-steel radial tires, the most important property of the sidewall rubber is the bending property, the bending property of all the examples can reach 90 ten thousand times without cracking, and the fatigue resistance is very excellent. What is more critical is that the tear strength of all the examples is improved to a certain extent compared with that of comparative examples 1 and 2, and more surprising is that the tear strength of examples 2 to 4 is almost doubled, the high-strength tear property indicates that the toughness is better, the crack resistance is excellent, and the occurrence of side wall cracks of the tire during the running process is reduced, so that the service life of the side wall is prolonged.
The following table 5 shows the results of the physical and mechanical properties of the formulations after 100℃ 48H heat aging in examples 1 to 4 according to the invention and comparative examples 1 to 2:
TABLE 5-100 ℃ 48H thermo-oxidative aging results of formulation physicomechanical properties
The heat aging retention rate calculation formula is as follows:
the main purpose of the thermo-oxidative aging test is to observe the physical property retention rate of the rubber compound after thermo-oxidative aging under certain experimental conditions, and the aging of the tire is inevitable and only the aging speed can be delayed. The retention of thermal ageing is related to the service life of the tyre and must not be too low, otherwise the physical properties of the compound decrease too rapidly as ageing of the tyre occurs, the residual properties may be insufficient to support the tyre for further use, and the tyre may fail prematurely.
As can be seen from Table 5, the retention of the physicomechanical properties of the sidewall rubber compositions of examples 1-4 of the present invention after 100 ℃ 48H thermo-oxidative aging is either comparable or improved to a certain extent compared to the comparative examples.
The following table 6 is a table of the results of the ozone aging test in examples 1 to 4 of the present invention and comparative examples 1 to 2, wherein the test conditions are as follows: ozone concentration: 50 pphm; test temperature: 40 ℃; performing ozone aging under the condition of stretching by 20 percent; aging time: 72h time observation test:
TABLE 6 ozone aging test results table
As can be seen from the above Table 6, no cracks were observed in the aging test of the tire side wall rubbers in examples 1 to 4 of the present invention, while fine cracks were observed in comparative example 2.
Selecting the tire sidewall rubber produced by the workshop mixing process in the embodiment 4, manufacturing a finished tire, and carrying out machine tool tests, wherein the specification of the tested tire is LT265/70R168PR117/114S, and the test conditions of the high-speed test are as follows: inspecting the wheel rim: 8J; and (3) checking the air pressure: 450 kPa; the test load is 1156.5kg (standard load is 1285 kg); and (3) checking the ambient temperature: 35.1-36.2 ℃, and the test conditions of the endurance test are as follows: inspecting the wheel rim: 8J; and (3) checking speed: 120 km/h; and (3) checking the air pressure: 450 kPa; and (3) load checking: standard load 1285 kg; and (3) checking the ambient temperature: 35.1-39.2 ℃. Table 7 below-machine performance testing of finished tires of example 4:
TABLE 7-example 4 machine tool Performance testing of finished tires
From the above table 7, it can be seen that, when the sidewall rubber composition in example 4 of the present invention is used as an example for testing the machine performance of a finished tire, the trial-manufactured finished tire passes the national test standards of high speed performance and endurance performance tests, wherein the national standard of the high speed performance test is 180km/h, and the national standard of the endurance test is 34h, and the trial-manufactured finished tire belongs to a product which can be completely normally circulated and used.
The following table 8 is an appearance observation of the finished tires in example 4 of the present invention and comparative example 1:
TABLE 8 finished tire appearance observations
As can be seen from Table 8, the finished tire prepared from the sidewall rubber composition of example 4 of the present invention was slightly, but not significantly, bluish in color locally after 22 weeks of storage. Therefore, the finished tire prepared in the embodiment of the invention does not need protective wax for visual adjustment, can be stored for a longer period to generate a color change phenomenon, and has an obvious effect of improving the visual effect of the appearance of the sidewall of the finished tire.
The tire side wall prepared from the rubber composition in the embodiment of the invention has excellent bending property, higher tensile strength at break, excellent tearing strength, excellent surface fineness and brightness while ensuring the physical properties of the semi-steel radial tire, such as hardness, elastic modulus and the like of the tire side wall and the matching requirements of an extrusion process. The toughness of the sidewall rubber is improved, the condition that the sidewall of the tire is cracked in the using process is reduced, the service life of the tire is prolonged, and meanwhile, the effects of improving the brightness of the appearance of the sidewall and improving the appearance of the sidewall are achieved.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (8)
1. The tire side wall rubber composition is characterized by comprising the following components in parts by weight: 30-70 parts of natural rubber, 30-70 parts of butadiene rubber, 20-40 parts of first carbon black, 10-30 parts of second carbon black, 5-20 parts of inorganic reinforcing filler, 5-20 parts of nano modified mineral material, 5-10 parts of environment-friendly aromatic oil, 1-3 parts of silane coupling agent, 1-3 parts of carbon black dispersing agent, 4-6 parts of hydrocarbon petroleum tackifying resin, 2-5 parts of resin modified asphalt, 2-4 parts of vulcanizing agent and vulcanization accelerator, 5-10 parts of vulcanization activator, 3-6 parts of anti-aging agent and 0.1-0.3 part of anti-scorching agent;
the nitrogen adsorption specific surface area of the first carbon black is 80 to 120m2(ii)/g, the nitrogen adsorption specific surface area of the second carbon black is 31 to 44m2(ii)/g, the carbon black dispersant comprises a mixture of fatty acid zinc soap salts;
the inorganic reinforcing filler is white carbon black, and the BET specific surface area of the white carbon black is 160-170m2/g，
The nano modified mineral material is anatase titanium dioxide or nano modified composite silicate, the average grain diameter of the anatase titanium dioxide is less than or equal to 1 mu m, and SiO in the nano modified composite silicate2Not less than 40% of Al2O3The content is not less than 30 percent, and the average grain diameter is less than or equal to 2 mu m.
2. The tire side wall rubber composition of claim 1, comprising the following components in parts by weight: 45-65 parts of natural rubber, 35-55 parts of butadiene rubber, 25-35 parts of first carbon black, 15-25 parts of second carbon black, 8-15 parts of inorganic reinforcing filler, 8-16 parts of nano modified mineral material, 5-7 parts of environment-friendly aromatic oil, 1-2 parts of silane coupling agent, 1-2 parts of carbon black dispersing agent, 4-6 parts of hydrocarbon petroleum tackifying resin, 2-4 parts of resin modified asphalt, 2-3.5 parts of vulcanizing agent and vulcanizing accelerator, 5-7 parts of vulcanizing active agent, 4-6 parts of anti-aging agent and 0.1-0.25 part of anti-scorching agent.
3. The tire side wall rubber composition of claim 1 or 2, wherein the environment-friendly aromatic oil comprises at least one of environment-friendly aromatic oil Vivatec500 or environment-friendly aromatic oil DM420, and the resin modified asphalt is at least one of resin modified asphalt RT-40FE or resin modified asphalt CJ-100.
4. The tire sidewall rubber composition of claim 1 or 2, wherein the vulcanizing agent comprises sulfur, the vulcanization accelerator comprises at least one of N-tert-butyl-2-benzothiazolesulfenamide TBBS, diphenyl guanidine DPG and N-cyclohexyl-2-benzothiazolesulfenamide CBS, and the vulcanization activator comprises activated zinc oxide and stearic acid.
5. The tire side-wall rubber composition of claim 1 or 2, wherein the antioxidant comprises N- (1, 3-dimethylbutyl) -N' -phenyl-p-phenylenediamine 6PPD, 2, 4-trimethyl-1, 2-dihydroquinoline polymer TMQ and Rhine wax, and the scorch retarder comprises N-cyclohexylthiophthalimide CTP.
6. A method of preparing the tire sidewall rubber composition of any one of claims 1-5, comprising the steps of:
mixing the natural rubber, the butadiene rubber, the hydrocarbon petroleum tackifying resin, the resin modified asphalt, the silane coupling agent, the vulcanization activator, the carbon black dispersant, and the nano-modified mineral material; then mixing the first carbon black, the inorganic reinforcing filler and the environment-friendly aromatic oil, stirring uniformly, mixing for the first time, discharging rubber materials to form a section of master batch,
mixing the first-stage masterbatch, the anti-aging agent and the vulcanization accelerator diphenylguanidine DPG, mixing with the second carbon black, uniformly stirring, mixing in a second stage, discharging rubber materials to form second-stage masterbatch,
and mixing the second-stage master batch, the scorch retarder, the vulcanizing agent and the vulcanization accelerator N-tert-butyl-2-benzothiazole sulfonamide TBBS, uniformly stirring, mixing in a three-stage way, and discharging rubber materials to obtain the tire side wall rubber composition.
7. The method of claim 6, wherein the step of mixing is as follows: the plug is lifted after the temperature of the plug is increased to 112-115 ℃ in 40-45s, the plug is lifted after the temperature of the plug is increased to 137-140 ℃ in 40-45s, finally the plug is pressed to 160-170 ℃ to remove the glue, the rotating speed is controlled at 40-50rpm,
the two-stage mixing comprises the following steps: the plug is lifted after the temperature of the plug is increased to 102-105 ℃ in 40-50s, the plug is lifted after the temperature is increased to 122-125 ℃ in 35s, finally the plug is pressed to be removed when the temperature is increased to 140-150 ℃, the rotating speed is controlled at 30-40rpm,
the three-stage mixing steps are as follows: the plug is lifted after the temperature of the plug is increased to 92-95 ℃ for 30-40s, then the temperature of the plug is increased to 100-110 ℃ for 30-40s for glue discharging, and the rotating speed is controlled to be 25-30 rpm.
8. A radial tire comprising a tire sidewall prepared from the rubber composition of any of claims 1-7.
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| CN112375261A (en) * | 2020-10-27 | 2021-02-19 | 万达集团股份有限公司 | Anti-out-of-control tire supporting part rubber material and preparation method thereof |
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