CN115975265A - Tire tread rubber composition with slow hardness change, application, mixing method and tire - Google Patents
Tire tread rubber composition with slow hardness change, application, mixing method and tire Download PDFInfo
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Abstract
The invention relates to the technical field of new materials for manufacturing tires, in particular to a tread rubber composition of a tire with slow hardness change, application, a mixing method and the tire. The tread rubber composition takes the epoxidized modified liquid natural rubber as a plasticizer during mixing, participates in a crosslinking reaction in a vulcanization process, and delays the hardness rise of the tread rubber in a heat aging process; and the dispersion of the white carbon black is improved, and the Tg change of the tread rubber is in the adjustable range of the formula.
Description
Technical Field
The invention relates to the technical field of new materials for manufacturing tires, in particular to a tread rubber composition of a tire with slow hardness change, application, a mixing method and the tire.
Background
The labeling method of tires puts forward a demand on the rolling resistance of tires, the tread is a main generation component of the rolling resistance of the tire, and tire designers often obtain lower rolling resistance by reducing fillers. However, a decrease in the amount of the filler adversely affects the reinforcing effect, and is liable to cause chipping or chipping. Natural rubber has a higher molecular weight than synthetic rubber and therefore is used in treads for better strength and elongation. For example, in our patent CN109251379B, a tread combination of natural rubber and two solution-polymerized butylbenzene, and a mercaptosilane coupling agent Si747 are used to achieve tan δ value of about 0.06 at 60 ℃, and a rolling resistance B-grade tire is produced. However, in this tread combination, since the amount of white carbon is small, there is a large space for optimizing the wet grip resistance. The main direction of optimization is to improve the wet-grip resistance while keeping the tan delta at 60 ℃ on the basis of improving the consumption and the dispersibility of the white carbon black.
On the other hand, in high-white carbon black reinforced tread rubber, softening oil needs to be added as a plasticizer in the mixing process. At present, the softening oil in the tire industry mainly uses low molecular weight TDAE or RAE oil. However, during the use of the tire, these softening oils, which are not crosslinked with the olefin-based rubber, tend to migrate to the surface of the tire relatively easily, resulting in an increase in the hardness of the tread rubber, accelerated aging hardening, and adverse effects on the ride comfort.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a tire tread rubber composition with slow hardness change, which is added with epoxidized modified liquid natural rubber as a plasticizer during mixing, participates in crosslinking reaction during vulcanization, and delays the hardness rise of the tread rubber during thermal aging; and the dispersion of the white carbon black is improved, and the Tg change of the tread rubber is in the adjustable range of the formula.
In order to achieve the purpose, the invention adopts the following technical scheme:
the tread rubber composition of the tire with slowly changed hardness is prepared by mixing the following raw materials in 100 parts by weight:
rubber component 100 parts
70.0 to 100.0 portions of white carbon black
0.5-10.0 parts of carbon black
2.0 to 25.0 portions of E-LqIR
4.0-15.0 parts of a silane coupling agent;
the E-LqIR is epoxidized modified liquid natural rubber, and the number average molecular weight Mn of the liquid natural rubber needs to meet the following requirements: mn is more than or equal to 3500 and less than or equal to 7000, and the epoxidation degree of the liquid natural rubber needs to satisfy: EC is more than or equal to 5 and less than or equal to 20.
Preferably, the rubber is one or a mixture of more of Natural Rubber (NR), isoprene Rubber (IR), styrene Butadiene Rubber (SBR), butadiene Rubber (BR), butyl rubber (IIR), ethylene propylene diene monomer rubber (EPDM), acrylonitrile-butadiene rubber (NBR), styrene-isoprene-butadiene rubber (SIBR) and Chloroprene Rubber (CR); preferably, the rubber component is one or a mixture of more of natural rubber, styrene butadiene rubber and butadiene rubber. In order to obtain a tire with good rolling resistance and excellent wet grip resistance, the rubber component is preferably natural rubber and styrene-butadiene rubber, wherein the styrene-butadiene rubber is selected from solution-polymerized styrene-butadiene rubber A and solution-polymerized styrene-butadiene rubber B, the mass of styrene in the solution-polymerized styrene-butadiene rubber A accounts for 20-30% of the total weight of the polymer, and the mass of vinyl accounts for 50-60% of the total weight of butadiene; the mass of styrene in the selected solution polymerized styrene-butadiene rubber B accounts for 40-50% of the total weight of the polymer, and the mass of vinyl accounts for 20-40% of the total weight of the butadiene; preferably, 25.0 to 50.0 parts of natural rubber, 5.0 to 30.0 parts of solution polymerized styrene-butadiene rubber A and 40.0 to 80.0 parts of solution polymerized styrene-butadiene rubber B; further preferably, 30.0-40.0 parts of natural rubber, 20.0-30.0 parts of solution polymerized styrene-butadiene rubber A and 40.0-60.0 parts of solution polymerized styrene-butadiene rubber B.
Preferably, the tread rubber composition is prepared by mixing the following raw materials in 100 parts by weight of rubber components:
rubber component 100 parts
80.0 to 100.0 portions of white carbon black
2.0 to 8.0 portions of carbon black
10.0-20.0 parts of E-LqIR
6.0-9.0 parts of silane coupling agent.
Preferably, the E-LqIR is epoxidized modified liquid natural rubber, and the number average molecular weight Mn of the liquid natural rubber is required to satisfy the following requirements: mn is more than or equal to 3500 and less than or equal to 5000, and the epoxidation degree of the liquid natural rubber needs to meet the following requirements: EC is more than or equal to 5 and less than or equal to 15.
In the reinforcing component of the invention, the combined use mode or the single use mode of the white carbon black and the carbon black is selected.
The BET specific surface area of the white carbon black in the rubber composition is 50-250 m 2 A/g, preferably from 80 to 210m 2 The white carbon black of the invention should be selected to have nitrogen adsorption specific surface area (BET) of 200m 2 The high nitrogen adsorption specific surface area and high dispersion white carbon black of/g and above. By adjusting the BET specific surface area within such a range, more excellent dispersibility, wet skid resistance, and abrasion resistance can be obtained. The BET specific surface area of white carbon black can be determined in accordance with JIS Z8830. The BET method is a method of adsorbing nitrogen gas having a known occupied area on the surface of sample powder particles and determining the specific surface area of the sample powder particles from the adsorbed amount thereof, and the specific surface area determined by this method is referred to as "BET specific surface area".
The silica in the rubber composition of the present invention is a silica-silicate filler, and not only silica in a narrow sense but also silica can be appropriately selected and used from conventional fillers for reinforcement. Examples thereof include wet silica (hydrous silicic acid) and dry silica (anhydrous silica). Among these, wet silica is preferable from the viewpoint of further improving the processability, wet skid resistance and abrasion resistance. These may be used alone in 1 kind, or may be used in combination of 2 or more kinds.
Preferably, the white carbon black is precipitated white carbon black, and the white carbon black is selected from white carbon black with nitrogen adsorption specific surface area (BET) of 200m 2 The high nitrogen adsorption specific surface area and high dispersion white carbon black of/g and above.
In the rubber composition of the present invention, carbon black particles may be further blended in the rubber component from the viewpoint of further improving the abrasion resistance. Preferably, medium ultra abrasion resistant carbon black (ISAF) having a particle size of 20 to 25nm can be selected.
Examples of the carbon black constituting the carbon black particles include furnace black, thermal black, acetylene black, and ketjen black. Among these, furnace carbon black is preferable from the viewpoint of further improving the mechanical strength of the rubber composition. These may be used alone in 1 kind, or may be used in combination of 2 or more kinds. Preferably, the carbon black of the present invention is one of N220, N234, N330 and N375.
Examples of the silane coupling agent include sulfide-based, polysulfide-based, thioester-based, thiol-based, olefin-based, epoxy-based, amino-based, alkyl-based silane coupling agents, and 1 kind of these may be used alone, or 2 or more kinds may be mixed and used. Preferably, the silane coupling agent is mercaptosilane, and most preferably is silane coupling agent Si747.
Preferably, the tread rubber composition further comprises: 2.0-10.0 parts of active agent, 2.0-6.0 parts of anti-aging agent and 1.0-5.0 parts of vulcanizing agent. More preferably, the activator is zinc oxide and stearic acid: 2.0 to 4.0 portions of ZnO and 1.0 to 3.0 portions of stearic acid; the antioxidant adopts antioxidant 6PPD, microcrystalline wax 1987 and microcrystalline wax 11213; 1.5-3.0 parts by weight of 6PPD, 0.5-2.0 parts by weight of microcrystalline wax 1987 and 0.5-1.5 parts by weight of microcrystalline wax 11213; the vulcanizing agent comprises sulfur, an accelerator CZ and an accelerator TBzTD, wherein 1.0-3.0 parts by weight of sulfur, 1.5-3.0 parts by weight of a vulcanization accelerator CZ and 0.1-0.5 part by weight of an accelerator TBzTD.
Preferably, the raw material for mixing the tread rubber composition also comprises 5.0 to 20.0 weight parts of alpha-methyl styrene resin.
Further, the invention also discloses application of the tread rubber composition in preparing a tire with low rolling resistance and high wet grip, wherein the hardness of the tire slowly changes.
Further, the invention also discloses a mixing method of the tread rubber composition, which uses a series one-off internal mixer, controls the rotor speed of the internal mixer to be 10-60rpm, the upper ram pressure to be 55N/cm < 2 >, and the cooling water temperature of the internal mixer to be 30-40 ℃, and comprises the following steps:
1. an upper auxiliary machine process:
(1) adding rubber, white carbon black, a white carbon black dispersing agent, a silane coupling agent, stearic acid, an anti-aging agent 6PPD and ground-grabbing resin, pressing a top bolt and keeping for 50-70 seconds;
(2) lifting the top bolt and keeping for 4-6 seconds;
(3) pressing a top bolt to heat the rubber material to 140-150 ℃;
(4) lifting the top plug and adding zinc oxide;
(5) pressing a top bolt to mix the rubber material at the constant temperature of 140-150 ℃ for 50-70 seconds;
(6) discharging the rubber material to a lower auxiliary machine;
2. the following auxiliary machine process:
(1) heating the sizing material to 140-150 ℃;
(2) mixing at 1140-150 deg.c for 200-300 sec;
(3) discharging rubber to an open mill, turning over and cooling the rubber to 90-100 ℃, adding a vulcanizing agent to the open mill, dispersing uniformly, and cooling the lower piece to room temperature.
Furthermore, the invention also discloses a tire with low rolling resistance, high wet grip and slow hardness change, wherein the tread of the tire is prepared by vulcanizing the tread rubber composition.
The invention has the beneficial effects that:
(1) The home-made epoxidized modified liquid natural rubber (E-LqIR) is added and used as a plasticizer during mixing, and participates in a crosslinking reaction in a vulcanization process, so that the hardness rise of the tread rubber in a heat aging process is delayed;
(2) Controlling the molecular weight and the epoxidation degree of the liquid rubber, and enabling the Tg change of the tread rubber to be within a formula adjustable range while improving the dispersion of white carbon black;
(3) When the tread composition is designed, the tire with good rolling resistance and excellent wet grip resistance is obtained by matching proper solution polymerized butylbenzene, white carbon black and silane coupling agent.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and fully below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Given the embodiments of the present invention, all other embodiments that can be obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present invention.
The invention selects 8 tread rubbers, all the tread rubbers are 100 parts, the reference ratio is embodiment 2 in CN109251379B patent, and the invention is further improved by the comparative example. All examples used the home-made E-LqIR equivalent in place of the environmental oil TDAE. Examples 1 to 3 used 80% white carbon black, and examples 4 and 5 used an increased amount of white carbon black. E-LqIR with higher epoxidation degree is used in comparative examples 1-2, and 30 white carbon black is used in comparative example 3. The formulation of the specific examples, comparative tread compositions and the basic structural properties of E-LqIR are shown in Table 1 (units).
TABLE 1 formulation of the Tread composition and basic structural Properties of E-LqIR
| Tread rubber | Reference ratio | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Natural rubber | 36.5 | 35 | 35 | 35 | 25 | 30 | 35 | 35 | 36.5 | 35 |
| Solution polymerized styrene-butadiene rubber A | 10 | 20 | 20 | 20 | 30 | 25 | 20 | 20 | 10 | 20 |
| Solution polymerized styrene butadiene rubber B | 67 | 56.25 | 56.25 | 56.25 | 56.25 | 56.25 | 56.25 | 56.25 | 67 | 56.25 |
| White carbon black | 40 | 80 | 90 | 100 | 80 | 80 | 80 | 80 | 40 | 80 |
| Si747 | 4.8 | 9.6 | 10.8 | 12.0 | 9.6 | 9.6 | 9.6 | 9.6 | 4.8 | 9.6 |
| TDAE | 10 | - | - | - | - | - | - | - | - | - |
| E-LqIR | - | 10 | 15 | 20 | 10 | 10 | 10 | 10 | 10 | - |
| Number average molecular weight (Mn) | - | 3700 | 3700 | 3700 | 3700 | 3700 | 4100 | 4500 | 3700 | - |
| EC（mol%） | - | 6 | 6 | 6 | 6 | 6 | 23 | 35 | 6 | - |
| Tg (. Degree.C.) of E-LqIR | - | -77 | -77 | -77 | -77 | -77 | -60 | -48 | -77 | - |
In the above table, the solution polymerized styrene-butadiene rubber A is SE-0212, the mass of styrene accounts for 25% of the total weight of the polymer, the mass of vinyl accounts for 57% of the total weight of butadiene, and the product of Sumitomo chemical; the solution polymerized styrene-butadiene rubber B is sold as NS560, the mass of styrene accounts for 42 percent of the total weight of the polymer, the mass of vinyl accounts for 30 percent of the total weight of butadiene, the oil content is 20 percent, and the product of Nippon Ruizziensis company is obtained; natural rubber SVR3L, vietnam of origin; the trade name of white carbon black is 200MP, a Solvay chemical product; silane coupling agent Si747, jiangsu Qi Xiang chemical products; environmental protection oil TDAE has trade name V700, ningbo Hansheng chemical product; E-LqIR is self-made. The other materials in the composition are the same and comprise 5.0phr of N234 carbon black, 4020.0 phr of anti-aging agent, 2.0phr of ZnO, 1.0phr of stearic acid, 15phr of alpha-methylstyrene resin, 2.0phr of accelerator CZ, 0.2phr of accelerator TBzTD, 1.6phr of microcrystalline wax and 1.8phr of sulfur.
The mixing method of the tread compositions of the above examples and comparative examples is as follows:
a series one-step internal mixer is used, the rotor speed of the internal mixer is controlled to be 10-60rpm, the upper ram pressure is controlled to be 55N/cm < 2 >, and the cooling water temperature of the internal mixer is controlled to be 30-40 ℃, and the method comprises the following steps:
1. an upper auxiliary machine process:
(1) adding rubber, white carbon black, a white carbon black dispersing agent, a silane coupling agent, stearic acid, an anti-aging agent 6PPD and ground-grabbing resin, pressing a top bolt and keeping for 60 seconds;
(2) lifting the top bolt and keeping for 5 seconds;
(3) pressing a top bolt to heat the rubber material to 145 ℃;
(4) lifting the top plug and adding zinc oxide;
(5) pressing a top bolt to mix the rubber material at the constant temperature of 145 ℃ for 60 seconds;
(6) discharging the rubber material to a lower auxiliary machine.
2. The following auxiliary machine process:
(1) heating the sizing material to 145 ℃;
(2) mixing at 145 ℃ for 250 seconds;
(3) discharging rubber to an open mill, turning and cooling the rubber material to 90-100 ℃, adding a vulcanizing agent on the open mill, uniformly dispersing, and cooling the lower piece to room temperature.
And vulcanizing the rubber material obtained by mixing in a prepared die, wherein the vulcanization condition is 160 ℃ for 15min, and the pressure is 15MPa. The properties of the vulcanizates were then determined using the test methods shown below.
Characterization method for the degree of epoxidation of E-LqIR: in the 1HNMR spectrum, signals are respectively present at 4.6-4.8,4.8-5.0 and 5.0-5.2 ppm due to the olefinic methyl protons of the 3,4-,1,2-,1, 4-addition units of polyisoprene. At 2.7ppm, a signal from the epoxy methane proton could be observed. In addition, a signal produced by n-octanol was observed at a concentration of 3.6 ppm. The epoxide content of E-LqIRs was calculated using peak areas of 4.6-4.8, 5.0-5.2, and 2.7 ppm.
Characterization method of the Tg point of E-LqIR: the temperature was raised from-80 to 100 ℃ at a temperature rise rate of 10 ℃/min, as measured by DSC.
The Tg of the vulcanizate of the tread composition is the temperature of the peak of tan δ in the DMA temperature scan. The DMA test method comprises the following steps: frequency: 20Hz; static strain: 10% and dynamic strain 2%. Temperature scanning range: -50 to 80 ℃.
The method for measuring the hardness value of the aged rubber compound comprises the following steps: after heating in a thermal oxidation oven at 100 ℃ for 60 hours, the hardness values were determined.
Specific examples of the invention, comparative example tread compositions, vulcanizates, and tire performance (e.g., 225/55R 17) are shown in Table 2.
TABLE 2
| Tread rubber | Reference ratio | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Mooney value of rubber | 76 | 78 | 80 | 82 | 76 | 79 | 78 | 76 | 77 | 75 |
| Hardness of | 58 | 63 | 65 | 66 | 64 | 64 | 65 | 64 | 60 | 59 |
| Hardness after aging | 65 | 66 | 67 | 70 | 67 | 66 | 69 | 68 | 65 | 66 |
| Value of change in hardness | 7 | 3 | 2 | 3 | 3 | 2 | 4 | 4 | 6 | 7 |
| Breaking strength (MPa) | 22.64 | 23.44 | 22.78 | 23.88 | 18.33 | 22.57 | 21.46 | 20.87 | 19.87 | 18.95 |
| Elongation at Break (%) | 632 | 577 | 598 | 546 | 557 | 586 | 568 | 533 | 612 | 578 |
| Tread rubber Tg (. Degree. C.) | -23 | -18 | -18 | -17 | -15 | -14 | -12 | -11 | -20 | -22 |
| 0℃ tanδ | 0.456 | 0.435 | 0.419 | 0.372 | 0.445 | 0.430 | 0.450 | 0.465 | 0.435 | 0.410 |
| 60℃ tanδ | 0.059 | 0.075 | 0.089 | 0.097 | 0.072 | 0.073 | 0.110 | 0.121 | 0.070 | 0.092 |
| Coefficient of rolling resistance of tire | 7.3 (class B) | 6.8 (class B) | 7.3 (class B) | 7.5 (class B) | 6.9 (class B) | 7.0 (class B) | 7.8 (class B) | 8.0 (class C) | 7.2 (class B) | 7.4 (class B) |
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, and is provided in the accompanying drawings. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The tread rubber composition of the tire with slowly changed hardness is characterized by being prepared by mixing the following raw materials in 100 parts by weight of rubber components:
rubber component 100 parts
70.0-100.0 parts of white carbon black
0.5-10.0 parts of carbon black
2.0 to 25.0 portions of E-LqIR
4.0-15.0 parts of a silane coupling agent;
the E-LqIR is epoxidized modified liquid natural rubber, and the number average molecular weight Mn of the liquid natural rubber needs to meet the following requirements: mn is more than or equal to 3500 and less than or equal to 7000, and the epoxidation degree of the liquid natural rubber needs to satisfy: EC is more than or equal to 5 and less than or equal to 20.
2. The tread rubber composition of claim 1, wherein the rubber component is one or more of natural rubber, styrene butadiene rubber and butadiene rubber; preferably, the rubber component is selected from natural rubber and styrene-butadiene rubber, wherein the styrene-butadiene rubber is selected from solution-polymerized styrene-butadiene rubber A and solution-polymerized styrene-butadiene rubber B, the mass of styrene in the solution-polymerized styrene-butadiene rubber A accounts for 20-30% of the total weight of the polymer, and the mass of vinyl accounts for 50-60% of the total weight of butadiene; the mass of styrene in the selected solution polymerized styrene-butadiene rubber B accounts for 40-50% of the total weight of the polymer, and the mass of vinyl accounts for 20-40% of the total weight of the butadiene; preferably, 25.0 to 50.0 parts of natural rubber, 5.0 to 30.0 parts of solution polymerized styrene-butadiene rubber A and 40.0 to 80.0 parts of solution polymerized styrene-butadiene rubber B; further preferably, 30.0-40.0 parts of natural rubber, 20.0-30.0 parts of solution polymerized styrene-butadiene rubber A and 40.0-60.0 parts of solution polymerized styrene-butadiene rubber B.
3. The tread rubber composition of claim 1 or 2, wherein the tread rubber composition is prepared by mixing the following raw materials based on 100 parts of rubber components:
rubber component 100 parts
80.0 to 100.0 portions of white carbon black
2.0 to 8.0 portions of carbon black
10.0-20.0 parts of E-LqIR
6.0-9.0 parts of silane coupling agent.
4. The tread rubber composition of claim 1 or 2, wherein the E-LqIR is an epoxidized modified liquid natural rubber having a number average molecular weight Mn satisfying: mn is more than or equal to 3500 and less than or equal to 5000, and the epoxidation degree of the liquid natural rubber needs to satisfy: EC is more than or equal to 5 and less than or equal to 15.
5. The tread rubber composition of claim 1 or 2, wherein the silica is selected to have a nitrogen adsorption specific surface area (BET) of 200m 2 High nitrogen adsorption specific surface area and high dispersion white carbon black of/g and above; the carbon black is medium and super wear-resistant carbon black with the particle size of 20-25 nm.
6. The tread rubber composition according to claim 1 or 2, wherein the silane coupling agent is mercaptosilane, preferably silane coupling agent Si747.
7. The tread rubber composition of claim 1 or 2, wherein the mixed raw materials of the tread rubber composition further comprise: 2.0-10.0 parts of active agent, 2.0-6.0 parts of anti-aging agent and 1.0-5.0 parts of vulcanizing agent; preferably, the activator is zinc oxide and stearic acid: 2.0 to 4.0 portions of ZnO and 1.0 to 3.0 portions of stearic acid; the antioxidant adopts antioxidant 6PPD, microcrystalline wax 1987 and microcrystalline wax 11213; 1.5-3.0 parts by weight of 6PPD, 0.5-2.0 parts by weight of microcrystalline wax 1987 and 0.5-1.5 parts by weight of microcrystalline wax 11213; the vulcanizing agent adopts sulfur, an accelerator CZ and an accelerator TBzTD, 1.0 to 3.0 weight parts of sulfur, 1.5 to 3.0 weight parts of a vulcanization accelerator CZ and 0.1 to 0.5 weight part of an accelerator TBzTD; furthermore, the mixed raw material of the tread rubber composition also comprises 5.0 to 20.0 weight parts of alpha-methyl styrene resin.
8. Use of the tread rubber composition of any one of claims 1 to 7 for the preparation of a tire having a low rolling resistance and a high wet grip with a slow change in tire hardness.
9. The method for mixing the tread rubber composition according to any one of claims 1 to 7, wherein an in-line one-shot internal mixer is used, the rotor speed of the internal mixer is controlled to 10 to 60rpm, the ram pressure is controlled to 55N/cm2, and the cooling water temperature of the internal mixer is controlled to 30 to 40 ℃, and the method comprises the steps of:
1. an upper auxiliary machine process:
(1) adding rubber, white carbon black, a white carbon black dispersing agent, a silane coupling agent, stearic acid, an anti-aging agent 6PPD and ground-grabbing resin, pressing a top bolt and keeping for 50-70 seconds;
(2) lifting the top bolt and keeping for 4-6 seconds;
(3) pressing a top bolt to heat the rubber material to 140-150 ℃;
(4) lifting the top plug and adding zinc oxide;
(5) pressing a top bolt to mix the rubber material at the constant temperature of 140-150 ℃ for 50-70 seconds;
(6) discharging the rubber material to a lower auxiliary machine;
2. the following auxiliary machine process:
(1) heating the sizing material to 140-150 ℃;
(2) mixing at 1140-150 deg.c for 200-300 sec;
(3) discharging rubber to an open mill, turning and cooling the rubber material to 90-100 ℃, adding a vulcanizing agent on the open mill, uniformly dispersing, and cooling the lower piece to room temperature.
10. A tire having a low rolling resistance, a high wet grip and a slow change in hardness, characterized in that the tread of the tire is obtained by vulcanizing the tread rubber composition according to any one of claims 1 to 8.
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| CN1513908A (en) * | 2002-12-04 | 2004-07-21 | 住友橡胶工业株式会社 | Rubber composition for tyre tread and inflating tyre using the same |
| JP2014214162A (en) * | 2013-04-22 | 2014-11-17 | 住友ゴム工業株式会社 | Rubber composition for tire and tire |
| CN107353448A (en) * | 2017-07-20 | 2017-11-17 | 中国热带农业科学院农产品加工研究所 | A kind of natural rubber/modified white carbon black composite and preparation method thereof |
| CN107383446A (en) * | 2017-07-31 | 2017-11-24 | 中策橡胶集团有限公司 | A kind of load-carrying tyre surface rubber nano composite material and preparation method thereof |
| CN115141415A (en) * | 2021-03-31 | 2022-10-04 | 北京化工大学 | Cutting-resistant and wear-resistant engineering machinery tire tread rubber and preparation method and application thereof |
| CN115044109A (en) * | 2022-07-29 | 2022-09-13 | 青岛双星轮胎工业有限公司 | Rubber composition, support rubber and run flat tire |
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| CN115975265B (en) | 2023-10-20 |
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