CN108276622B - Low-rolling-resistance tread inner liner rubber composition and application thereof - Google Patents

Low-rolling-resistance tread inner liner rubber composition and application thereof Download PDF

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CN108276622B
CN108276622B CN201810112089.9A CN201810112089A CN108276622B CN 108276622 B CN108276622 B CN 108276622B CN 201810112089 A CN201810112089 A CN 201810112089A CN 108276622 B CN108276622 B CN 108276622B
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rubber composition
rubber
surface area
specific surface
carbon black
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CN108276622A (en
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罗才仁
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Cheng Shin Tire and Rubber China Co Ltd
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Cheng Shin Tire and Rubber China Co Ltd
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    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/006—Additives being defined by their surface area
    • 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
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four 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)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Tires In General (AREA)

Abstract

The application provides a low rolling resistance tire tread inner liner rubber composition and application thereof, wherein the rubber composition comprises the following components in percentage by weight: 30 to 50 wt% of natural rubber or synthetic polyisoprene; 10-30 wt% polybutadiene rubber; 5 to 15% by weight of a first carbon black having a nitrogen adsorption specific surface area of less than 50m2(ii)/g; 10 to 30% by weight of a second carbon black having a nitrogen adsorption specific surface area of more than 70m2(ii)/g; x accounts for weight percent of the novolac resin, wherein X is more than 0 and less than or equal to 4; y is vulcanized tackifying resin, and Y is more than 0 and less than or equal to 2. The components act together in a certain proportion, so that the tensile strength (MPa), the rigidity E x 60 ℃ and the Shore A type hardness of the rubber composition are enhanced, and the rolling resistance (tan (delta) 60 ℃) of the rubber composition is reduced. The rubber composition provided by the invention is particularly suitable for an inner liner of a tire tread rubber, can save the use of a tire on fuel, and has good operation safety.

Description

Low-rolling-resistance tread inner liner rubber composition and application thereof
Technical Field
The invention relates to the technical field of tires, in particular to a rubber composition, and particularly relates to a low-rolling-resistance tread inner liner rubber composition and application thereof.
Background
The tire is an important component of an automobile, and the quality of the tire is directly related to personal and property safety. On the other hand, as the automobile holding capacity of people is continuously increased and energy conservation and reduction become important contents of industrial policies in China, the tire industry is developing towards energy conservation, safety and environmental protection.
Rubber is an important material for tire production, and in order to meet the demand for high-quality tires and the demand for environmental protection in the tire industry, tire companies and tire researchers have actively developed tires having all of steering stability, braking performance, and low fuel consumption, and have continued research in the field of materials for each constituent part of tires. Conventionally, a rubber composition has been widely used in a tire requiring abrasion resistance and mechanical strength by adding a reinforcing agent such as carbon black or silica to a rubber component such as natural rubber or styrene butadiene rubber to improve the mechanical strength of the rubber composition. However, when high mechanical strength and wear resistance are obtained, the rolling resistance is often increased, the energy consumption and CO emission of the automobile are increased, and the energy conservation and environmental protection of the automobile industry are not facilitated.
In recent years, in the development of rubber compositions, diene rubbers such as natural rubber and butadiene rubber have low hysteresis loss and are therefore widely used in fuel-efficient tires. In order to obtain lower rolling resistance, the amount of reinforcing filler used in the rubber composition may be reduced, however, reducing the amount of filler used results in a decrease in rubber hardness, which in turn leads to insufficient steering stability of the tire. Currently, in the selection of the reinforcing carbon black, carbon black having a high specific surface area improves rubber hardness, but increases hysteresis loss, resulting in a decrease in rolling resistance. While carbon black with a low specific surface area can reduce hysteresis loss, a reduction in hardness also results in insufficient steering stability. There is still room for improvement in the development of rubber compositions for tires in order to obtain a better compromise of properties.
Disclosure of Invention
In view of the above, the present application provides a low rolling resistance tread inner liner rubber composition and its application, which has excellent rolling resistance and maintains a certain hardness to provide a tire with good handling stability in steering. The rubber liner is particularly suitable for the inner liner of the tire tread rubber, so that the tire can save fuel and has good control safety in use.
The present invention provides a rubber composition containing:
30 to 50 wt% of natural rubber or synthetic polyisoprene;
10-30 wt% polybutadiene rubber;
5 to 15% by weight of a first carbon black having a nitrogen adsorption specific surface area of less than 50m2/g；
10 to 30% by weight of a second carbon black having a nitrogen adsorption specific surface area of more than 70m2/g；
X accounts for weight percent of the novolac resin, wherein X is more than 0 and less than or equal to 4;
y is vulcanized tackifying resin, and Y is more than 0 and less than or equal to 2.
Preferably, the polybutadiene rubber contains syndiotactic 1, 2-polybutadiene crystals, preferably contains 97 wt% or more of 1, 4-polybutadiene cis-structure, and contains 3 to 19 wt% of syndiotactic 1, 2-polybutadiene crystals.
Preferably, the first carbon black has a nitrogen adsorption specific surface area of 31 to 44m2CTAB uptake/gThe specific surface area is 31 to 47m2(ii)/g; the nitrogen adsorption specific surface area of the second carbon black is 73-124 m2The specific surface area of CTAB adsorption is 76-125 m2/g。
Preferably, the rubber composition comprises: 0.01 to 3 wt% of a novolac resin; 0.01 to 1.5 wt% of a vulcanization tackifying resin.
Preferably, the novolac resin is a polymeric resin of formaldehyde and phenol.
Preferably, the vulcanized tackifying resin is an amine resin containing hydroxymethyl groups.
Preferably, the rubber composition further comprises: chemical anti-aging agents and accelerators.
Preferably, the accelerator is selected from one or more of thiazole accelerators and sulfenamide accelerators, preferably N-cyclohexyl-2-benzothiazolylsulfinamide and/or N-tert-butyl-2-benzothiazolylsulfinamide.
Preferably, the chemical antioxidant is selected from one or more of p-phenylenediamine antioxidants and quinoline polymer antioxidants, and is preferably N- (1, 3-dimethylbutyl) -N' -phenyl-1, 4-phenylenediamine and/or 2,2, 4-trifluoromethyl-1, 2-dihydroquinoline polymer.
In addition, the invention also provides the application of the rubber composition as an inner liner layer of the tire tread rubber.
Compared with the prior art, the rubber composition provided by the invention comprises the following components: natural rubber or synthetic polyisoprene and polybutadiene, and mixing the carbon black with low specific surface area with the carbon black with high specific surface area for use together, and matching with novolac resin and vulcanized tackifying resin to endow the rubber material with certain hardness, stress at definite elongation and processing adhesiveness. The components act together in a certain proportion, so that the tensile strength (MPa), the rigidity E x 60 ℃ and the Shore A type hardness of the rubber composition are enhanced, and the rolling resistance (tan (delta) 60 ℃) of the rubber composition is reduced. The rubber composition provided by the invention is particularly suitable for an inner liner of a tire tread rubber, can save the use of a tire on fuel, and has good operation safety.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
The present invention provides a rubber composition containing: 30 to 50 wt% of natural rubber or synthetic polyisoprene; 10-30 wt% polybutadiene rubber; 5 to 15% by weight of a first carbon black having a nitrogen adsorption specific surface area of less than 50m2(ii)/g; 10 to 30% by weight of a second carbon black having a nitrogen adsorption specific surface area of more than 70m2(ii)/g; x accounts for weight percent of the novolac resin, wherein X is more than 0 and less than or equal to 4; y is vulcanized tackifying resin, and Y is more than 0 and less than or equal to 2.
The rubber composition provided by the invention has low rolling resistance, simultaneously increases the mechanical strength, wear resistance and hardness, achieves good balance among all performances, is particularly suitable for an inner liner of a tire tread rubber, can save the use of a tire on fuel, and has good control safety.
The rubber composition of the present invention comprises: natural rubber or synthetic polyisoprene, and polybutadiene rubber; that is, the raw rubber is a mixture of natural rubber or synthetic polyisoprene and polybutadiene rubber, and the raw rubber is preferably a mixture of natural rubber and polybutadiene rubber. Wherein, natural rubber or synthetic polyisoprene is the main matrix rubber. The natural rubber is a natural high molecular compound taking cis-1, 4-polyisoprene as a main component, and the rest components are non-rubber substances such as protein, fatty acid, ash, saccharides and the like; generally classified as standard rubber or crumb rubber. The synthetic polyisoprene is usually synthetic rubber, and the preferred synthetic polyisoprene has a high cis structure, and the content of the 1, 4-cis structure is more than 98%. In an embodiment of the invention, the natural rubber is preferably the standard rubber SVR-3; the content of the matrix rubber is 30 to 50 wt%, preferably 35 to 45 wt%.
The polybutadiene rubber is a general synthetic rubber obtained by polymerizing 1, 3-butadiene as a monomer, and can be divided into cis-polybutadiene and trans-polybutadiene according to molecular structures. In the present invention, the polybutadiene rubber generally contains syndiotactic 1, 2-polybutadiene crystals, preferably contains 97% by weight or more of cis-structure of 1, 4-polybutadiene and 3 to 19% by weight of syndiotactic 1, 2-polybutadiene crystals, more preferably contains 98% by weight of cis-structure of 1, 4-polybutadiene and 17% by mass of syndiotactic 1, 2-polybutadiene crystals. The polybutadiene rubber content in the present invention is 10 to 30% by weight, preferably 15 to 28%.
In the present invention, the rubber composition contains a reinforcing filler, which is divided into two types, a first carbon black (carbon black a) and a second carbon black (carbon black B); the carbon black A is carbon black with low specific surface area, and nitrogen adsorption specific surface area is less than 50m2In g, and carbon black B is a high specific surface area carbon black having a nitrogen adsorption specific surface area of more than 70m2(ii) in terms of/g. The invention comprises 5-15 wt% of low specific surface area carbon black; 10 to 30 wt% of carbon black having a high specific surface area. Specifically, the content of the carbon black A is preferably 9 to 13 mass%, and the nitrogen adsorption specific surface area is 31 to 44m2A concentration of 36 to 44 m/g is preferred2(ii)/g; the oil absorption can be 92-112 mL/100 g; the CTAB adsorption specific surface area is 31-47 m2(ii) in terms of/g. The content of the carbon black B is preferably 15 to 20 mass%, and the nitrogen adsorption specific surface area is 73 to 124m2Preferably 73 to 83 m/g2(ii)/g; the oil absorption can be 92-112 mL/100 g; the CTAB adsorption specific surface area is 76-125 m2(ii) in terms of/g. The invention can improve the comprehensive performance of rubber by mixing the carbon black with low specific surface area with the carbon black with high specific surface area.
The rubber composition comprises resins, mainly phenolic novolac resin and vulcanized tackifying resin; the invention can endow rubber material with certain hardness, certain stretching stress, processing adhesiveness and the like by matching with the novolac resin and the vulcanized tackifying resin. The embodiment of the invention comprises the following steps: 0 to 4 wt% of a phenol novolac resin and 0 to 2 wt% of a cured tackifying resin, preferably comprising: 0.01 to 3 wt% of a novolac resin; 0.01 to 1.5 wt% of a vulcanization tackifying resin. In the present invention, the novolac resin is preferably a polymeric resin of formaldehyde and phenol, and may be synthesized by oil or latex modification; in the embodiment of the invention, the number average molecular weight is 1000-2000, and the product is PFM-T; the vulcanization tackifying resin is preferably an amine resin containing hydroxymethyl groups, and is more preferably a hexamethoxymethylmelamine resin; in the embodiment of the invention, the melting point is 52-58 ℃ and about 55 ℃.
The rubber generally also contains auxiliary agents such as a vulcanizing agent, an active agent, an accelerator, an anti-aging agent, a plasticizer and the like; in an embodiment of the invention, the rubber composition further comprises: chemical anti-aging agents and accelerators. The chemical antioxidant can be selected from one or more of p-phenylenediamine antioxidants and quinoline polymer antioxidants, preferably two compounds are adopted, namely an antioxidant A and an antioxidant B, wherein the antioxidant A is N- (1, 3-dimethyl butyl) -N' phenyl 1,4 phenylenediamine and can account for 0.1-1.0 mass percent, preferably 0.6 mass percent; the anti-aging agent B is a polymer of 2,2, 4-trimethyl-1, 2-dihydroquinoline, and the content thereof may be 0.1 to 1.0 mass%, preferably 0.3 mass%.
The accelerator is a vulcanization accelerator, can be selected from one or more of thiazole accelerators and sulfenamide accelerators, preferably adopts two combinations of accelerator A and accelerator B, wherein the accelerator A is N- (1, 3-dimethylbutyl) -N' phenyl 1,4 phenylenediamine and can account for 0.1-1.0 mass percent, preferably 0.4 mass percent; the accelerator B is N-tert-butyl-2-benzothiazolylsulfinamine, and the content of the accelerator B can be 0.1-1.0 mass%, and is preferably 0.4 mass%.
The invention has no special limitation on the components and contents of the conventional rubber auxiliaries such as a vulcanizing agent, an active agent and the like, and can adopt the components commonly used in the field. In the embodiment of the present invention, the vulcanizing agent is preferably sulfur, such as insoluble sulfur, which contains 80% of sulfur and 20% of oil, and the content may be 1 to 2% by mass, preferably 1.5% by mass. The activating agent is preferably zinc oxide and stearic acid, and the content of the activating agent can be 1-3 mass%. The invention may further comprise a physical anti-aging agent, preferably microcrystalline wax, and the content thereof may be 1 to 2 mass%, preferably 1.2 mass%. The present invention may further comprise a softening plasticizer, preferably an aromatic oil, and the content thereof may be 0.1 to 1.5 mass%, preferably 1.2 mass%.
In the examples of the present invention, the above rubber compositions were mixed by stepwise mixing using a general Banbury mixer. The mixed raw materials can comprise raw rubber, reinforcing filler, resin, aromatic oil, zinc oxide, stearic acid, an anti-aging agent, an accelerant and sulfur, wherein the accelerant and the sulfur are added in the last stage, and the rest are added in the stages of primary mixing and remixing.
The preparation process in the embodiment of the invention is totally divided into three stages: in the first stage, raw rubber, reinforcing filler and resin are added in proportion, and the mixing temperature is preferably 140-160 ℃; in the second stage (re-mixing stage), zinc oxide, stearic acid, an anti-aging agent and the like are added in proportion, and the mixing temperature is preferably 140-160 ℃. And in the final mixing stage, adding an accelerant and sulfur, wherein the mixing temperature is preferably 90-115 ℃. After the kneading, the unvulcanized rubber composition of the present example was press-vulcanized at 160 ℃ for 20 minutes to obtain a vulcanized rubber composition.
In addition, the invention also provides the application of the rubber composition as an inner liner layer of the tire tread rubber. The rubber composition is particularly suitable for an inner liner of a tire tread rubber, can save the use of the tire on fuel, and has good operation safety. Said tire innerliner is also referred to as a tread base layer; the present invention is not particularly limited in terms of tire type, specification, structure, and the like.
The present invention provides a rubber composition comprising: natural rubber or synthetic polyisoprene and polybutadiene, and mixing the carbon black with low specific surface area with the carbon black with high specific surface area for use together, and matching with the novolac resin and the vulcanized tackifying resin to endow the rubber material with certain hardness, stress at definite elongation and processing adhesiveness. The components act together in a certain proportion, so that the tensile strength (MPa), the rigidity E x 60 ℃ and the Shore A type hardness of the rubber composition are enhanced, and the rolling resistance (tan (delta) 60 ℃) of the rubber composition is reduced, thereby being beneficial to the application of the rubber composition as an inner liner of a tire tread.
For further understanding of the present application, the low rolling resistance tread lining rubber composition and its use provided herein will be specifically described below with reference to examples.
In the following examples and comparative examples, the natural rubber was the standard rubber SVR-3L; polybutadiene rubber manufactured by UBEIndships, which has a cis-structure content of 1, 4-polybutadiene of 98% and contains 17 mass% of syndiotactic 1, 2-polybutadiene crystals (the melting point of syndiotactic 1, 2-polybutadiene crystals is 200 ℃); the carbon black A is ASTM grade carbon black, and the nitrogen adsorption specific surface area is 73-83 m2Oil absorption of 92-112 mL/100 g; the carbon black B is ASTM grade carbon black, and the nitrogen adsorption specific surface area is 36-44 m2Oil absorption of 112 to 132 g
mL/100 g; the aromatic oil is H & R GROUP environment-friendly aromatic oil VIVATEC 500; the novolac resin is PFM-T manufactured by Changzhou Changjing; the cured tackifying resin is hexamethoxymethylmelamine resin manufactured by Bara Chemical, has a melting point of about 55 ℃, and contains 35 mass% of silica and oil; the anti-aging agent A is N- (1, 3-dimethylbutyl) -N' phenyl 1,4 phenylenediamine manufactured by saint Aurea chemistry; the anti-aging agent B is a polymer of 2,2, 4-trimethyl-1, 2-dihydroquinoline manufactured by saint-ao chemistry; accelerator A is N-cyclohexyl-2-benzothiazolylsulfinamide manufactured by Shandong Shunhun; accelerator B is N-tert-butyl-2-benzothiazolylsulfinamide manufactured by Shunhua Shandong; the insoluble sulfur is prepared from FLEXSYS, and contains 80% sulfur and 20% oil.
Example 1
The compositions shown in Table 1 were prepared in a stepwise mixing manner using a conventional Banbury mixer. In the first stage, raw rubber, reinforcing filler and resin are added in proportion, and the mixing temperature is 150 ℃. And a mixing stage, namely adding zinc oxide, stearic acid, an anti-aging agent and the like in proportion, wherein the mixing temperature is 150 ℃. And finally, in the mixing stage, adding an accelerant and sulfur, and mixing at the temperature of 105 ℃.
After the kneading, the unvulcanized rubber composition was press-vulcanized at 160 ℃ for 20 minutes to obtain a vulcanized rubber composition.
TABLE 1 Components and contents thereof (numerical unit: wt%) of comparative examples 1 to 2 and examples 1 to 3 of the present invention
Figure BDA0001569499640000061
Figure BDA0001569499640000071
Examples 2 to 3
Films were obtained by kneading the components shown in Table 1 in the same manner as in example 1.
Comparative examples 1 to 3
Films were obtained by kneading the components shown in Table 1 in the same manner as in example 1.
The films obtained in the examples and comparative examples were subjected to a performance test by the following method:
and (3) tensile test:
tensile tests were carried out at room temperature using No. 3 dumbbell test pieces made from the vulcanized rubber compositions in accordance with standard astm d 412 (tensile test of vulcanized rubber with thermoplastic elastomer), and the tensile strength (MPa) and elongation at break EB (%) were measured. The higher the tensile strength value is, the higher the tensile strength is; the larger the value of EB, the higher the elongation at break.
Shore a hardness:
the shore a hardness of each vulcanized rubber composition after curing is measured according to the standard ASTM D2240 (shore hardness test method for rubbers), with a higher value representing a higher rubber hardness.
And (3) testing the viscoelastic property:
the dynamic mechanical properties of the samples of the respective vulcanized rubber compositions were measured according to standard ISO 4664 (determination of the dynamic properties of the vulcanized or thermoplastic rubber), using a viscoelasticity analyzer to record the values of the complex modulus E and of the loss tangent tan (δ) during a temperature sweep at a frequency of 10Hz and a dynamic strain of 2%, the value E representing the rigidity of the material, the greater the value E, the greater the rigidity, in a manner known to those skilled in the art; the value of tan (delta) at 60 ℃ represents the rolling resistance of the material, and a smaller value of tan (delta) at 60 ℃ represents a lower rolling resistance.
The results of the rubber composition property test are shown in Table 2:
TABLE 2 test Properties of rubber compositions of comparative examples and examples of the present invention
Figure BDA0001569499640000081
From the above examples, it can be seen that the rubber composition provided by the present invention has the components acting together at a certain ratio, so that the tensile strength (MPa), the elongation at break (%), the rigidity E × 60 ℃, and the shore a hardness of the rubber composition are enhanced, and the rolling resistance (tan (δ)60 ℃) is reduced. The rubber composition provided by the invention can be applied to high-performance tires, is particularly suitable for an inner liner of a tread rubber of the tire, can save the use of the tire on fuel, has good control safety, and improves the conditions of heating and the like when the tire runs at high speed.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to the embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.

Claims (13)

1. A low rolling resistance tread inner liner rubber composition comprising:
30 to 50 wt% of natural rubber or synthetic polyisoprene;
10-30 wt% polybutadiene rubber;
5 to 15% by weight of a first carbon black having a nitrogen adsorption specific surface area of less than 50m2/g；
10 to 30% by weight of a second carbon black having a nitrogen adsorption specific surface area of more than 70m2/g；
X accounts for weight percent of the novolac resin, wherein X is more than 0 and less than or equal to 4;
y is vulcanized tackifying resin, and Y is more than 0 and less than or equal to 2.
2. The rubber composition of claim 1, wherein the polybutadiene rubber contains syndiotactic 1, 2-polybutadiene crystals.
3. The rubber composition according to claim 2, wherein the polybutadiene rubber contains a 1, 4-polybutadiene cis-structure in an amount of 97 wt% or more and contains 3 to 19 wt% of syndiotactic 1, 2-polybutadiene crystals.
4. The rubber composition according to claim 1, wherein the nitrogen adsorption specific surface area of the first carbon black is 31 to 44m2The CTAB adsorption specific surface area is 31-47 m2(ii)/g; the nitrogen adsorption specific surface area of the second carbon black is 73-124 m2The specific surface area of CTAB adsorption is 76-125 m2/g。
5. The rubber composition according to claim 1, wherein the rubber composition comprises: 0.01 to 3 wt% of a novolac resin; 0.01 to 1.5 wt% of a vulcanization tackifying resin.
6. The rubber composition of claim 1, wherein the novolac resin is a polymeric resin of formaldehyde and phenol.
7. The rubber composition according to claim 1, wherein the vulcanized tackifying resin is an amine-based resin containing a methylol group.
8. The rubber composition according to any one of claims 1 to 7, further comprising: chemical anti-aging agents and accelerators.
9. The rubber composition of claim 8, wherein the accelerator is selected from one or more of thiazole accelerators and sulfenamide accelerators.
10. A rubber composition according to claim 9, wherein the accelerator is N-cyclohexyl-2-benzothiazolylsulfinamide and/or N-tert-butyl-2-benzothiazolylsulfinamide.
11. The rubber composition according to claim 8, wherein the chemical antioxidant is one or more selected from the group consisting of p-phenylenediamine antioxidants and quinoline polymer antioxidants.
12. The rubber composition of claim 11, wherein the chemical antioxidant is N- (1, 3-dimethylbutyl) -N' phenyl-1, 4-phenylenediamine and/or 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer.
13. Use of the rubber composition according to any one of claims 1 to 12 as an inner liner layer of a tread rubber for a tire.
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