CN112280112A - Tread rubber composition capable of reducing rolling resistance and preparation method thereof - Google Patents
Tread rubber composition capable of reducing rolling resistance and preparation method thereof Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 81
- 239000005060 rubber Substances 0.000 title claims abstract description 81
- 238000005096 rolling process Methods 0.000 title claims abstract description 30
- 239000000203 mixture Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title description 3
- 239000006229 carbon black Substances 0.000 claims abstract description 33
- 239000011593 sulfur Substances 0.000 claims abstract description 26
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 26
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000004073 vulcanization Methods 0.000 claims abstract description 24
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 14
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 12
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 12
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000008117 stearic acid Substances 0.000 claims abstract description 12
- 239000011787 zinc oxide Substances 0.000 claims abstract description 10
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 9
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 8
- 239000013543 active substance Substances 0.000 claims abstract description 7
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 6
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 6
- 229920001194 natural rubber Polymers 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 6
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 3
- LRCFXGAMWKDGLA-UHFFFAOYSA-N dioxosilane;hydrate Chemical compound O.O=[Si]=O LRCFXGAMWKDGLA-UHFFFAOYSA-N 0.000 claims description 3
- 229960004029 silicic acid Drugs 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000004939 coking Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 15
- 238000004132 cross linking Methods 0.000 abstract description 14
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 230000032683 aging Effects 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 6
- 239000007822 coupling agent Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000013040 rubber vulcanization Methods 0.000 description 2
- 238000003878 thermal aging Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a tread rubber composition for reducing rolling resistance, which comprises a rubber component, a filler, an active agent, a silane coupling agent, sulfur and a vulcanization accelerator, wherein the rubber component is composed of natural rubber and butadiene rubber; the filler comprises 30-55 parts by weight and 5-15 parts by weight of white carbon black relative to 100 parts by weight of rubber component, the active agent consists of 2-5 parts by weight of zinc oxide and 1.5-3.5 parts by weight of stearic acid, the weight ratio of the stearic acid to the zinc oxide is 0.6-0.8, the total weight part of the sulfur and the vulcanization accelerator is 2.5-3.5 parts, and the weight ratio of the sulfur to the vulcanization accelerator is 0.55-0.75. According to the invention, the heating of the tire is controlled through a combined system of white carbon black and carbon black, the crosslinking density of the rubber material is increased and the type of a crosslinking bond is adjusted through a low-sulfur promotion ratio vulcanization system and the use amount of stearic acid is increased, so that the rigidity of the tire is improved, the energy loss is reduced, the rolling resistance of the tire is reduced, and the physical and mechanical properties of the rubber material are improved.
Description
Technical Field
The invention belongs to the technical field of tire rubber, and particularly relates to a tread rubber composition for reducing rolling resistance and a preparation method thereof.
Background
The oil consumption of the tire caused by the rolling resistance RRC accounts for about 15% of the total oil consumption of the automobile, and if the RRC is reduced by 30%, the oil consumption can be reduced by 4.5%, so that the RRC of the tire is effectively reduced, fuel oil can be saved, and the tire plays an important role in reducing greenhouse gas emission.
Common tires gradually lose competitive advantages, development and application of low rolling resistance tire products become mainstream trends, common low rolling resistance tire tread formula uses butadiene rubber, but the butadiene rubber has poor strength, the tire tread has the tendency of hardening and becoming brittle after aging, and the appearance of the tire tread has the risks of tearing and block falling particularly in the middle and later periods of use; and the rigidity of the butadiene rubber is lower, the rubber material is easier to deform, the large deformation and the hysteresis loss are correspondingly increased, and further the rolling resistance of the tire is increased.
In view of the design characteristics of the low rolling resistance tread formula, the dosage of the reinforcing material is relatively reduced compared with the traditional formula, and therefore, the rigidity of the rubber material is correspondingly reduced, and simultaneously, the rubber content of the formula is increased, the reversion of vulcanized rubber is increased, and the aging is kept worse.
Disclosure of Invention
The object of the present invention is to provide a tread rubber composition for reducing rolling resistance to overcome the above-mentioned technical problems.
The technical purpose of the invention is realized by the following technical scheme:
a tread rubber composition for reducing rolling resistance comprises a rubber component, a filler, an active agent, a silane coupling agent, sulfur and a vulcanization accelerator, wherein the rubber component is composed of natural rubber and butadiene rubber; the filler comprises 30-55 parts by weight and 5-15 parts by weight of white carbon black relative to 100 parts by weight of rubber component, the active agent consists of 2-5 parts by weight of zinc oxide and 1.5-3.5 parts by weight of stearic acid, the weight ratio of the stearic acid to the zinc oxide is 0.6-0.8, the total weight part of the sulfur and the vulcanization accelerator is 2.5-3.5 parts, and the weight ratio of the sulfur to the vulcanization accelerator is 0.55-0.75.
Further, the white carbon black adopts BET adsorption specific surface area of 180-220m2A precipitated hydrated silica in a proportion of g, the carbon black being N330 carbon black or HAF carbon black and having a CTAB adsorption specific surface area of 65 to 100m2/g。
Further, the silane coupling agent is present in an amount of 3 to 5 parts by weight per 100 parts by weight of the rubber component.
Further, the sulfur is 0.5 to 2.5 parts by weight and the vulcanization accelerator is 1.5 to 2.5 parts by weight based on 100 parts by weight of the rubber component.
Further, the weight ratio of the sulfur to the vulcanization accelerator is 0.6 to 0.7.
Further, the silane coupling agent adopts TESPT with effective content of 50%, and the weight ratio of the TESPT to the white carbon black is 0.3-0.5.
Another object of the present invention is to provide a process for producing a tread rubber composition for reducing rolling resistance, comprising the steps of,
step (1): adding all raw materials except the white carbon black, the silane coupling agent, the sulfur, the vulcanization accelerator and the anti-coking agent, pressurizing by a top plug for 20-40S, adding 50-80% of carbon black into a plug, pressurizing by the top plug for 25-45S, adding the rest carbon black into the plug, pressurizing by the top plug for 25-45S, extracting the plug for 5-15S, pressurizing and mixing to obtain a section of rubber compound, and discharging and cooling;
step (2): adding a first-stage rubber compound, white carbon black and a silane coupling agent, plugging the mixture by a top bolt for 30-60S, plugging the mixture by a plug for 5-15S, performing pressurized mixing for 40S or to 130-150 ℃, plugging the mixture for 5-15S, performing pressurized mixing for rubber discharge to obtain a second-stage rubber compound, and performing sheet discharge and cooling;
and (3): adding two-stage rubber compound, jacking and pressurizing for 30-60S, lifting the bolt for 5-15S, pressurizing and mixing for 40S or to 130-150 ℃, lifting the bolt for 5-15S, pressurizing, mixing and discharging rubber to obtain three-stage rubber compound, and discharging and cooling;
and (4): adding three sections of rubber compound, sulfur, vulcanization accelerator and scorch retarder, applying a top plug for pressurizing for 20S-40S, extracting the plug for 5S-15S, pressurizing, mixing and discharging rubber, obtaining final rubber, and discharging and cooling.
Has the advantages that:
according to the invention, a rubber system combining natural rubber and butadiene rubber is adopted to improve the abrasion performance of the tire, the generation of heat of the tire is controlled through a combined system of white carbon black and carbon black, and then a vulcanization system with low sulfur promotion ratio and the usage amount of stearic acid are increased, so that the crosslinking density of the rubber material is increased and the type of a crosslinking bond is adjusted to improve the rigidity of the tire, reduce the energy loss, reduce the rolling resistance of the tire and improve the physical and mechanical properties of the rubber material;
meanwhile, the coupling agent adopted in the invention is controlled within a reasonable dosage range, and the coupling agent can release free sulfur to make up for the cracking reaction during the rubber material crosslinking, so as to ensure that the rubber material is in a balanced state during the rubber material crosslinking, thereby reducing the rubber material reversion and maintaining the rubber material performance.
Detailed Description
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "front", "rear", and the like, indicate orientations or positional relationships only for the purpose of describing the present invention and simplifying the description, but do not indicate or imply that the designated device or structure must have a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The tread rubber composition for reducing the rolling resistance comprises a rubber component, a filler, an active agent, a silane coupling agent, sulfur and a vulcanization accelerator, wherein the rubber component comprises natural rubber and butadiene rubber, the filler comprises 30-55 parts of carbon black and 5-15 parts of white carbon black relative to 100 parts by weight of the rubber component, and the white carbon black adopts BET adsorption specific surface area of 180-220m2A precipitated hydrated silica in a proportion of g, the carbon black being N330 carbon black or HAF carbon black and having a CTAB adsorption specific surface area of 65 to 100m2(ii)/g; the activator consists of 2-5 parts of zinc oxide and 1.5-3.5 parts of stearic acid, and the weight ratio of the stearic acid to the zinc oxide is 0.6-0.8; 0.5 to 2.5 parts by weight of sulfur, 1.5 to 2.5 parts by weight of vulcanization accelerator, and the weight ratio of the sulfur to the vulcanization accelerator is 0.55 to 0.75, more preferably 0.6 to 0.7; the silane coupling agent is 3-5 parts by weight, the silane coupling agent adopts TESPT with the effective content of 50%, and the weight ratio of the TESPT to the white carbon black is 0.3-0.5.
The following examples and comparative examples, which are formed by providing three sets of protocols based on the rubber compositions described above, illustrate the invention and are not limited to the examples listed.
A first group:
second group:
third group:
the performance of the examples and comparative examples described in the three tables were measured under the following conditions and standards:
measurement conditions and standards:
1. scorching time: the scorch times of the rubber coupons were measured at 127 ℃ according to GB/T1233-2008.
2. Rheological data: rheological data were measured according to GB/T16584-. The reversion rate was calculated according to the following formula: reversion rate of vulcanization ═ Ffinal-FL)/(Fmax-FL) Wherein F isfinalFor testing final torque or force, N m or N, FmaxFor maximum torque or force during the test, N m or N, FLIs the minimum torque or force, N · m or N.
3. Shore hardness: the Shore hardness of the rubber test pieces was measured at 25 ℃ according to GB/T531.1-2008.
4. M100 modulus, M300 modulus, tensile strength at break, elongation at break were measured in accordance with GB/T528-.
The aging retention rate test is to place a rubber sample piece in an oven at 151 ℃ for 48 hours to obtain a sample piece after thermal aging, measure the elongation at break Eb and the stress at break Ts of the sample piece after aging according to the GB/T528-2009, and calculate the thermal aging retention rate according to the following formula: the heat aging retention ratio (Ts × Eb)/pre-aging (Ts × Eb) × 100% after aging.
5. tan δ and E': a rubber specimen having a thickness of 2mm was measured for its loss tangent tan δ and rigidity E' according to ISO 4664-1:2005 using a Dynamic Mechanical Analyzer (DMA) model GABOMETER 2000, manufactured by GABO, Germany, at an initial strain of 3%, a dynamic strain of 5%, a frequency of 10Hz and an ambient temperature of 25 ℃.
Wherein tan delta at 60 ℃ is related to the heat buildup property of the rubber, and the smaller the tan delta value at 60 ℃, the lower the heat generation; e 'represents the rigidity of the rubber, and the larger E' at 60 ℃, the smaller the deformation of the rubber under the same condition.
Lambourn abrasion: according to ISO 23337-2016, an AB-1152 type Lambourn tester of Ueshima company is adopted, and the load-carrying capacity of the tire is simulated by inputting a parameter of 40N of acting force F; the linear speed of the abrasion wheel is 80m/min, the slip rate is set to slip 30%, and the linear speed of the sample wheel is 56 m/min. The weight of the sample wheel is weighed before operation, and the weight of the sample wheel is weighed again after operation for 48S, and the weight is converted into the wear volume according to the density. The abrasion performance of the improved examples was converted into an index with the abrasion performance of the reference formulation being 100, with higher indices representing better abrasion performance.
The measured data are shown in tables 1 to 3 based on the above measurement conditions.
TABLE 1
TABLE 2
TABLE 3
From the experimental designs of the first to third groups and the experimental data of tables 1 to 3, it can be seen that:
in comparative example 1, 60 ℃ to Tan delta is higher, the abrasion resistance index is lower, and the rolling resistance is higher; in comparative example 2, the aging retention ratio of comparative example 2 is lower and the rolling resistance reduction range is smaller than that of example 1 compared with example 1; as can be seen from the comparison of comparative examples 1-3 with examples 1-3, the increase of the total amount of zinc oxide and stearic acid within a certain range can increase the crosslinking density, improve the tensile strength at break, and reduce the tensile strength by 60 ℃ to Tan delta; or the zinc oxide dosage is not changed, the stearic acid dosage is increased only, the crosslinking density can be increased within a certain range, the breaking strength is improved, and the 60-Tan delta is reduced, and the comparative example 3 shows that the breaking strength is reduced, the 60-Tan delta is increased and the reduction amplitude of the rolling resistance is smaller due to the excessive dosage.
As can be seen from the comparison between comparative examples 4 to 6 and examples 1 and 4 to 6, in comparative examples 4 to 5, although the rolling resistance was greatly reduced, the scorch time, the elongation at break, the aging retention rate, and MH were sacrificed, the processability was poor, and the influence on the physical properties of the rubber composition was large; in comparative example 6, the rolling resistance was not significantly decreased with respect to examples 4 to 6; generally speaking, under the condition of fixing the total amount of the sulfur and the accelerator, the aging retention rate can be improved by increasing the proportion of the accelerator, and the crosslinking density and the breaking strength are reduced due to too high proportion. Therefore, the method has the advantages that the crosslinking density of the rubber material is increased and the type of a crosslinking bond is adjusted through a reasonable vulcanization system with low sulfur acceleration ratio, so that the rigidity of the tire is improved, the energy loss is reduced, the rolling resistance of the tire is reduced, and the physical and mechanical properties of the rubber material are improved.
In addition, as can be seen from the comparison between comparative examples 7-8 and examples 7-8, the use amount of the coupling agent is increased, and the ratio of the coupling agent to the white carbon black is kept in a reasonable range, so that free sulfur can be slowly released by the coupling agent in the rubber vulcanization process, broken cross-linking bonds in the rubber vulcanization cross-linking process are compensated, and the cross-linking density of the rubber material is ensured to be in a balanced state, thereby reducing the reversion of the rubber material, keeping the rubber performance at a certain level, and reducing the risks of tearing and chipping of the tire tread in the middle and later periods of use; meanwhile, the rubber rigidity E' is improved, so that the rolling resistance of the finished tire is favorably reduced under the condition of equivalent level of 60-Tan delta.
In order to make the objects, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the above specific embodiments, which are only used for describing the present invention, and should not be construed as limiting the scope of the present invention. It should be understood that any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The tread rubber composition for reducing the rolling resistance is characterized by comprising a rubber component, a filler, an active agent, a silane coupling agent, sulfur and a vulcanization accelerator, wherein the rubber component comprises natural rubber and butadiene rubber, the filler comprises 30-55 parts of carbon black and 5-15 parts of white carbon black relative to 100 parts by weight of the rubber component, the active agent comprises 2-5 parts of zinc oxide and 1.5-3.5 parts of stearic acid, the weight ratio of the stearic acid to the zinc oxide is 0.6-0.8, the total weight part of the sulfur and the vulcanization accelerator is 2.5-3.5 parts, and the weight ratio of the sulfur to the vulcanization accelerator is 0.55-0.75.
2. The rolling resistance-reducing tread rubber composition as claimed in claim 1, wherein the silica white has BET adsorption specific surface area of 180-220m2A precipitated hydrated silica in a proportion of g, the carbon black being N330 carbon black or HAF carbon black and having a CTAB adsorption specific surface area of 65 to 100m2/g。
3. The rolling resistance-reducing tread rubber composition according to claim 1, wherein the silane coupling agent is present in an amount of 3 to 5 parts by weight per 100 parts by weight of the rubber component.
4. The rolling resistance-reducing tread rubber composition according to claim 1, wherein the sulfur is present in an amount of 0.8 to 2 parts by weight and the vulcanization accelerator is present in an amount of 1.5 to 2.5 parts by weight, based on 100 parts by weight of the rubber component.
5. The rolling resistance-reducing tread rubber composition according to claim 1 or 4, wherein the weight ratio of the sulfur to the vulcanization accelerator is 0.6 to 0.7.
6. The rolling resistance-reducing tread rubber composition according to claim 1 or 3, wherein TESPT having an effective content of 50% is used as the silane coupling agent, and the weight ratio of the TESPT to the white carbon black is 0.3 to 0.5.
7. The rolling resistance-reducing tread rubber composition according to claim 1, wherein the natural rubber is present in an amount of 60 to 80 parts by weight, and the butadiene rubber is present in an amount of 20 to 40 parts by weight.
8. A method for producing the rolling resistance-reducing tread rubber composition according to any one of claims 1 to 7, comprising the steps of,
step (1): adding all raw materials except the white carbon black, the silane coupling agent, the sulfur, the vulcanization accelerator and the anti-coking agent, pressurizing by a top plug for 20-40S, adding 50-80% of carbon black into a plug, pressurizing by the top plug for 25-45S, adding the rest carbon black into the plug, pressurizing by the top plug for 25-45S, extracting the plug for 5-15S, pressurizing and mixing to obtain a section of rubber compound, and discharging and cooling;
step (2): adding a first-stage rubber compound, white carbon black and a silane coupling agent, plugging the mixture by a top bolt for 30-60S, plugging the mixture by a plug for 5-15S, performing pressurized mixing for 40S or to 130-150 ℃, plugging the mixture for 5-15S, performing pressurized mixing for rubber discharge to obtain a second-stage rubber compound, and performing sheet discharge and cooling;
and (3): adding two-stage rubber compound, jacking and pressurizing for 30-60S, lifting the bolt for 5-15S, pressurizing and mixing for 40S or to 130-150 ℃, lifting the bolt for 5-15S, pressurizing, mixing and discharging rubber to obtain three-stage rubber compound, and discharging and cooling;
and (4): adding three sections of rubber compound, sulfur, vulcanization accelerator and scorch retarder, applying a top plug for pressurizing for 20S-40S, extracting the plug for 5S-15S, pressurizing, mixing and discharging rubber, obtaining final rubber, and discharging and cooling.
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