CN109181027B - High-performance tire tread rubber and preparation method thereof - Google Patents
High-performance tire tread rubber and preparation method thereof Download PDFInfo
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- CN109181027B CN109181027B CN201811042187.6A CN201811042187A CN109181027B CN 109181027 B CN109181027 B CN 109181027B CN 201811042187 A CN201811042187 A CN 201811042187A CN 109181027 B CN109181027 B CN 109181027B
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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
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- 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
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- 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
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention relates to a high-performance tire tread rubber and a preparation method thereof. The tire tread rubber comprises the following components in parts by mass: 60-90 parts of natural rubber, 0-20 parts of butadiene rubber, 9-20 parts of low-molecular-weight trans-butadiene-isoprene copolymer rubber, 40-60 parts of carbon black, 0-20 parts of white carbon black, 0-2 parts of a silane coupling agent, 1-5 parts of zinc oxide, 1-5 parts of stearic acid, 0.3-3 parts of sulfur, 0.5-5 parts of an accelerator, 1-3 parts of an anti-aging agent and 1-10 parts of other auxiliary agents. The invention adopts low molecular weight trans-butadiene-isoprene copolymer rubber to modify the tire tread rubber, the vulcanized rubber has the advantages of improving the tensile strength by 15-20%, improving the tearing strength by 1-20%, reducing the loss factor at 60 ℃ by 4-20% and reducing the abrasion by 10-25%. Various performances of the tire tread rubber sizing material provided by the invention meet the performances of tire tread rubber.
Description
Technical Field
The invention relates to a high-performance tire tread rubber, in particular to application of low-molecular-weight trans-butadiene-isoprene copolymer rubber in the tire tread rubber and a preparation method of the high-performance tire tread rubber.
Background
China is a large country for tire production and also a large country for tire export. The implementation of the European Union labeling method causes great impact on the tire industry in China, and forces the tire industry in China to continuously improve the tire grade, develop new materials and develop new formulas. "magic triangle" in tire: rolling resistance, wear and wet skid resistance are important indicators affecting tire performance. In the rubber industry, softeners are commonly used, which generally contain cyclic aromatic compounds, which are toxic and mostly polluting when the human body comes into contact with them. With the national environmental protection, the use of aromatic oils is limited. The low molecular rubber can replace aromatic oil, can reduce toxic compounds, reduce material pollution and increase the processing operability of rubber. Meanwhile, the low molecular rubber can participate in crosslinking during vulcanization due to the double bonds, becomes a component in a vulcanized network, and has excellent physical and chemical stability compared with aromatic oil.
Since the advent of liquid polysulfide rubber in 1943, almost all of the different rubber types currently have their corresponding low molecular weight rubber grades, including liquid polybutadiene rubber (LBR), liquid nitrile rubber (nbr), liquid polyisoprene rubber (LIR), Liquid Styrene Butadiene Rubber (LSBR), liquid silicone rubber, liquid ethylene propylene rubber, liquid polysulfide rubber, and liquid polyurethane rubber (rubber science and technology market). Various grades of low molecular weight liquid polydiene rubbers such as LIR, LBR, LSBR manufactured by japan kory corporation are widely used in the field of rubber products (www.kuraray.com). Low molecular weight rubbers are currently used in many applications as adhesives and sealing materials, as well as in tread compounds and beads in tires. The low molecular rubber is applied to the tire, so that the filler dispersion of the rubber can be improved, and the air trapping phenomenon can be reduced in the tire bead of the tire. The application of low molecular weight rubber can improve the processability of rubber and facilitate the realization of the continuity and automation of production, but has the defect of high production cost. The preparation of liquid rubber and its use in natural rubber are reported in Special rubber products. The study of liquid rubbers in a combination of Natural Rubber (NR) and Butadiene Rubber (BR) systems is also reported in the rubber industry, and the microstructure and vulcanizate properties of liquid rubbers in NR/BR systems are characterized (synthetic rubber industry). The application of liquid butadiene-isoprene copolymers in NR/BR blend systems is also reported in the materials bulletin.
The low molecular weight trans butadiene-isoprene copolymer rubber of the invention is different from the reported liquid rubber such as LIR or LBR mainly with high cis-1, 4-structure or mixed structure, but is a butadiene and isoprene multi-block copolymer with the trans structure content of more than 92 percent, which not only contains crystallizable trans-1, 4-polybutadiene (TPB) block, but also contains crystallizable trans-1, 4-polyisoprene (TPI) block, not only can improve the processability of rubber compound, but also can be used as compatilizer to improve the compatibility of natural rubber and cis-butadiene rubber, and simultaneously, the crystallizability also can endow the rubber compound with better comprehensive mechanical property.
Disclosure of Invention
The invention aims to solve the problems of migration and pollution of aromatic oil in the use of tires, and provides low-molecular-weight trans-butadiene-isoprene copolymer rubber which can participate in vulcanization crosslinking and is used in tire tread rubber to improve the processing and mixing performance of rubber materials and participate in vulcanization crosslinking.
Another object of the present invention is to improve the compatibility of natural rubber with butadiene rubber and to provide a formulation system in which a low molecular weight trans-butadiene-isoprene copolymer rubber is used as a compatibilizer for a tread rubber of a tire.
The invention also aims to provide the high-performance tire tread rubber, wherein the tensile strength of vulcanized rubber can be improved by 15-20%, the tearing strength is improved by 1-20%, the loss factor at 60 ℃ is reduced by 4-20%, and the abrasion is reduced by 10-25%.
The invention further aims to provide a preparation process of the high-performance tire tread rubber.
Therefore, the invention provides a high-performance tire tread rubber, which adopts low-molecular-weight trans-butadiene-isoprene copolymer rubber modified natural rubber or a natural rubber/butadiene rubber combined system, and the formula of the rubber compound comprises the following components in parts by weight:
60-90 parts of natural rubber;
0-20 parts of butadiene rubber;
9-20 parts of low-molecular-weight trans-butadiene-isoprene copolymer rubber;
40-60 parts of carbon black;
0-20 parts of white carbon black;
0-2 parts of a silane coupling agent;
1-5 parts of zinc oxide;
1-5 parts of stearic acid;
0.3-3 parts of sulfur;
0.5-5 parts of an accelerator;
1-3 parts of an anti-aging agent;
1-10 parts of other auxiliary agents.
According to the formula, the low molecular weight trans-butadiene-isoprene copolymer rubber has a butadiene unit molar content of 5-70%, an isoprene unit molar content of 95-30%, a trans-1, 4-structure molar content of more than 85%, a Mooney viscosity (100 ℃, 3+4 minutes) of 10-30, a weight average molecular weight of 5000-20000, and a molecular weight distribution of 5-45.
The high-performance tire tread rubber provided by the invention is characterized in that the low-molecular-weight trans-butadiene-isoprene copolymer rubber accounts for 8-25% of the total weight of the rubber; the natural rubber accounts for 60-90% of the total weight of the rubber; the butadiene rubber accounts for 0 to 22 percent of the total weight of the rubber.
The carbon black used in the formula of the high-performance tire tread rubber is one or more of the brands N110, N234, N330, N375 and N339, and the preferable part of the carbon black is 40-60 parts by mass; the white carbon black is one or more of fumed white carbon black and precipitated white carbon black, and the optimal part is 0-20 parts by mass; the preferable parts of the adopted silane coupling agent are 0-2 parts, and the preferable silane coupling agent is one or more of bis- (gamma-triethoxysilylpropyl) tetrasulfide (Si69), gamma-aminopropyltriethoxysilane (KH-550) and gamma-methacryloxypropyltrimethoxysilane (KH-570); the promoter is one or more of NOBS, CZ, DM and TMTD.
The high-performance tire tread rubber provided by the invention is characterized in that the antioxidant used is one or more of antioxidant RD, antioxidant 4020 and antioxidant NA.
The high-performance tire tread rubber provided by the invention is characterized in that other auxiliary agents are used in combination with one or more of a scorch retarder, aromatic oil and paraffin.
The vulcanization system has very important influence on the performance of the high-performance tire tread rubber vulcanized rubber, and when the common vulcanization system is adopted, the using amount of the accelerator is 0.5-0.6 part, and the using amount of the sulfur is 2-3 parts; when an effective vulcanization system is adopted, the using amount of the accelerator is 3-5 parts, and the using amount of the sulfur is 0.3-0.5 part; when a semi-effective vulcanization system is adopted, the using amount of the sulfur is 0.8-1.5 parts, and the using amount of the accelerator is 0.8-1.5 parts.
The invention also provides a preparation method of the high-performance tire tread rubber, which comprises a mixing process and a vulcanization process, and the preparation method comprises the following specific steps:
first-stage banburying:
firstly, adopting an internal mixer, setting the internal mixing temperature of the internal mixer to be 50-70 ℃ and the rotating speed of the internal mixer to be 40-100 r/min; adding all raw rubber including natural rubber, butadiene rubber and low-molecular-weight trans-butadiene-isoprene copolymer rubber, and banburying for 1-5 min;
adding zinc oxide, stearic acid, an anti-aging agent and other auxiliary agents, and banburying for 1-6 min;
thirdly, all carbon black is added and banburying is carried out for 2-12 min;
fourthly, adding the white carbon black and the silane coupling agent, and banburying for 4-15 min;
cleaning the upper top plug;
and sixthly, banburying for 5-20 min, discharging rubber, controlling the rubber discharging temperature to 145-155 ℃, and controlling the rubber discharging temperature by controlling the rotating speed of a rotor and a cooling system of the banbury mixer. Standing for 0.1-5 hours at room temperature to obtain a section of dense rubber;
two-stage banburying:
adding the first-stage rubber compound into an internal mixer, setting the internal mixing temperature to be 50-70 ℃, setting the rotating speed of the internal mixer to be 40-70 r/min, and internally mixing for 5-15 min to remove rubber to obtain second-stage masterbatch;
open mixing:
setting the open milling temperature to be 40-80 ℃, the rotating speed of a slow roller of the open mill to be 30-60 revolutions per minute, and the rotating speed ratio of double rollers of the open mill to be 1.4: 1-1.1: 1; and (3) putting the two-stage masterbatch into an open mill, 2mm open mill wrapping rollers, adding an accelerator and sulfur, cutting left and right 3/4 rubber for three times respectively, thinly passing through by 0.2mm, wrapping the rubber for six times in a triangular manner, feeding the rubber to the 2mm wrapping rollers, standing at 23 ℃ for 24-72 hours, and vulcanizing.
Alternatively, the invention can prepare the high-performance tire tread rubber by adopting the following steps:
first-stage banburying:
firstly, putting all natural rubber and butadiene rubber into an internal mixer, and carrying out internal mixing for 1-5 min;
adding zinc oxide, stearic acid, an anti-aging agent and other auxiliary agents, and banburying for 1-6 min;
thirdly, all carbon black is added and banburying is carried out for 2-12 min;
fourthly, adding the white carbon black and the silane coupling agent, and banburying for 4-15 min;
cleaning the upper top plug;
adding low molecular weight trans butadiene-isoprene copolymer rubber, pressing and banburying
Discharging rubber after 6-25 min, and standing at room temperature for 0.1-5 hours to obtain a section of dense rubber;
wherein the first-stage banburying temperature is 50-70 ℃, the rotating speed of the banbury mixer is 40-100 r/min, the rubber discharge temperature is 145-155 ℃, and the rubber discharge temperature can be controlled by controlling the rotating speed of a rotor and a cooling system of the banbury mixer;
two-stage banburying:
adding the first-stage rubber compound into an internal mixer, and carrying out internal mixing for 5-15 min to remove rubber to obtain a second-stage masterbatch; wherein the two-stage banburying temperature is 50-70 ℃, and the rotating speed of the banbury mixer is 40-70 r/min;
open mixing:
putting the two-stage masterbatch into an open mill, 2mm open mill wrapping rollers, adding an accelerator and sulfur, cutting rubber for 3/4 left and right three times respectively, thinly passing through for 0.2mm, wrapping for six times by a triangular bag, and feeding sheets by the 2mm wrapping rollers to obtain a rubber compound, standing at 23 ℃ for 24-72 h, and vulcanizing; wherein the open milling temperature is 40-80 ℃, the rotating speed of the slow roller of the open mill is 30-60 r/min, and the rotating speed ratio of the double rollers of the open mill is 1.4: 1-1.1: 1.
The high-performance tire tread rubber is characterized in that the vulcanization temperature is 130-155 ℃ and the vulcanization time is 5-30 min when the rubber compound is vulcanized. The preferable vulcanization temperature of the high-performance tire tread rubber is 150 ℃, and the vulcanization time is determined according to the positive vulcanization time of the process.
The high-performance tire tread rubber provided by the invention has the advantages that the low-molecular-weight trans-butadiene-isoprene copolymer rubber is used in the tire tread rubber, the tensile strength of vulcanized rubber is improved by 15-20%, the tearing strength is improved by 1-20%, the loss factor at 60 ℃ is reduced by 4-20%, the abrasion is reduced by 10-25%, and the compatibility is improved by 6-10%.
The vulcanized rubber of the high-performance tire tread rubber provided by the invention can be applied to the tire tread of a truck tire and the tire tread of a giant tire.
Detailed Description
The invention is further illustrated by the following examples, which are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever. The properties of the compositions disclosed in the examples were evaluated as described below.
Based on the national standard GB/T16584-.
Based on the national standard GB/T528-; tensile stress (MPa) was measured at 100% (MA100) and 300% (MA300) elongation; based on the national standard GB/T529-; DMA was tested in tensile mode with strain of 5%, frequency 10Hz, temperature range: -10-100 ℃. The vulcanized rubber was tested for Arthron abrasion at 23 ℃ based on the national standard GB/T1689-.
Comparative example 1
A high-performance tire tread rubber compound is composed of the following components in parts by weight:
80 parts of natural rubber;
20 parts of butadiene rubber;
carbon black N23450 parts;
1165MP 7 parts of white carbon black;
silane coupling agent Si690.7 parts;
3.5 parts of zinc oxide;
2.0 parts of stearic acid;
1.5 parts of sulfur;
1.6 parts of accelerator CZ;
1 part of an anti-aging agent RD;
40202.0 parts of anti-aging agent
0.7 part of antiscorching agent CTP.
Wherein the natural rubber NR is domestic standard rubber, and the butadiene rubber BR is BR 9000.
The following mixing and vulcanizing processes are adopted:
(1) first-stage banburying: setting the banburying temperature of a banbury mixer to be 70 ℃, and setting the rotating speed of the banbury mixer to be 70 r/min; adding natural rubber and butadiene rubber into an internal mixer, and internally mixing for 1 min; adding zinc oxide, stearic acid, anti-aging agent and scorch retarder, and banburying for 2 min; adding all carbon black, and banburying for 6 min; adding white carbon black and a silane coupling agent, and banburying for 7 min; cleaning a top plug, banburying for 12min, discharging rubber at 150 ℃, and standing for 1 hour at room temperature to obtain a section of banburying rubber.
(2) And (3) carrying out two-stage banburying, namely putting the first-stage banburying rubber into a banbury mixer, setting the banburying temperature of the banbury mixer to be 70 ℃, setting the rotating speed of the banbury mixer to be 50 r/min, and discharging the rubber after 8min to obtain the second-stage masterbatch.
(3) Open mixing: and (3) milling the two-stage masterbatch prepared in the step (2) on an open mill, wherein the rotation speed of the open mill is 40 revolutions per minute, the open milling temperature is 60 ℃, 2mm open milling wrapping rollers are added with the accelerant and the sulfur, the left 3/4 rubber tapping and the right 3/4 rubber tapping are respectively carried out for three times, the rubber is thinly passed by 0.2mm and is wrapped by a triangle for six times, and the rubber is wrapped by the 2mm wrapping rollers and is discharged to obtain the rubber compound. Standing at 23 deg.C for 48h, and vulcanizing.
(4) And (3) vulcanization: and testing the vulcanization characteristic curve of the rubber compound at 150 ℃ to determine the positive vulcanization time of the process. And (3) vulcanizing at 150 ℃ for positive vulcanization time by a process to obtain vulcanized rubber. The vulcanizate properties are shown in Table 1.
Example 1
A high-performance tire tread rubber compound is composed of the following components in parts by weight:
80 parts of natural rubber;
20 parts of butadiene rubber;
10 parts of low-molecular-weight trans butadiene-isoprene copolymer rubber;
the rest is the same as in comparative example 1.
The low molecular weight trans-butadiene-isoprene copolymer rubber had a molar content of butadiene units of 40.7%, a molar content of isoprene units of 59.3%, a molar content of trans-1, 4-structures of greater than 95%, and a Mooney viscosity value (100 ℃, 3+4) of 21.6. The vulcanizate properties are shown in Table 1.
Example 2
The first-stage banburying process comprises the following steps:
adding natural rubber and butadiene rubber into an internal mixer, internally mixing for 1min, adding zinc oxide, stearic acid, an anti-aging agent and an anti-scorching agent, and internally mixing for 1 min; adding all carbon black, and banburying for 2 min; adding white carbon black and a silane coupling agent, and banburying for 7 min; cleaning the upper top plug; adding low molecular weight trans butadiene-isoprene copolymer rubber, banburying for 7.5min, discharging rubber at 150 ℃, and standing for 1 hour at room temperature to obtain a first-stage dense rubber compound.
The rest is the same as example 1. The vulcanizate properties are shown in Table 1.
Example 3
73 parts of natural rubber;
18 parts of butadiene rubber;
9 parts of low-molecular-weight trans-butadiene-isoprene copolymer rubber;
the rest is the same as example 1. The vulcanizate properties are shown in Table 1.
Example 4
73 parts of natural rubber;
18 parts of butadiene rubber;
9 parts of low-molecular-weight trans-butadiene-isoprene copolymer rubber;
carbon black N33950 parts;
3.5 parts of zinc oxide;
2.0 parts of stearic acid;
1.5 parts of sulfur;
1.6 parts of accelerator CZ;
1 part of an anti-aging agent RD;
2.0 parts of anti-aging agent NA
0.5 part of antiscorching agent CTP.
First-stage mixing: adding natural rubber and butadiene rubber into an internal mixer, internally mixing for 1min, adding zinc oxide, stearic acid, an anti-aging agent and an anti-scorching agent, and internally mixing for 1 min; adding all carbon black, and banburying for 2.5 min; cleaning the upper top plug; adding low molecular weight trans butadiene-isoprene copolymer rubber, banburying for 7.5min, discharging rubber at 150 ℃, and standing for 1 hour at room temperature to obtain a first-stage dense rubber compound.
Otherwise, the same as in example 1. The vulcanizate properties are shown in Table 1.
As can be seen from Table 1, when the low molecular weight trans-butadiene-isoprene copolymer rubber is used in a tire tread rubber, the process positive vulcanization time is shortened, and the scorch time is prolonged. The crosslink density of examples 1 and 2 decreased slightly, while the crosslink density of examples 3 and 4 was close to that of comparative example 1. The vulcanized rubber containing the low-molecular-weight trans-butadiene-isoprene copolymer rubber has obviously improved comprehensive mechanical properties: the tensile strength and the tearing strength are obviously improved; the Akron abrasion performance is improved, and the abrasion loss is reduced; the loss factor value at 60 ℃ decreases, which means that the rolling resistance of the tire decreases.
Based on the glass transition temperature (Tg) of the natural rubber in the vulcanizateNR) Glass transition temperature (Tg) with butadiene rubberBR) Δ Tg difference of (1)NR-TgBRTo characterize compatibility. The two glass transition temperatures in the vulcanizates of examples 1-4 are closer (as indicated by a small Δ Tg) compared to comparative example 1, indicating that the addition of a low molecular weight trans butadiene-isoprene copolymer rubber improves the compatibility of the natural rubber with the butadiene rubber while promoting co-crosslinking between the natural rubber and the butadiene rubber. In conclusion, the low molecular weight trans-butadiene-isoprene copolymer rubber can obviously improve the performance of the tire tread rubber and can be used for preparing high-performance tire treads.
TABLE 1 vulcanization characteristics and vulcanizate Properties of the mixes of examples 1 to 4 and comparative example 1
Claims (9)
1. A high-performance tire tread rubber is characterized in that a low-molecular-weight trans-butadiene-isoprene copolymer rubber modified natural rubber or a natural rubber/butadiene rubber combined system is adopted, and a rubber compound formula comprises the following components in parts by weight:
60-90 parts of natural rubber;
18-20 parts of butadiene rubber;
9-20 parts of low-molecular-weight trans-butadiene-isoprene copolymer rubber;
40-60 parts of carbon black;
0-20 parts of white carbon black;
0-2 parts of a silane coupling agent;
1-5 parts of zinc oxide;
1-5 parts of stearic acid;
0.3-3 parts of sulfur;
0.5-5 parts of an accelerator;
1-3 parts of an anti-aging agent;
1-10 parts of other auxiliary agents;
the contents of the butadiene rubber and the silane coupling agent are not 0 at the same time; the low molecular weight trans-butadiene-isoprene copolymer rubber improves the processing and mixing performance of rubber compound, and the loss factor of the tire tread rubber prepared after the rubber compound participates in vulcanization crosslinking, which represents rolling resistance and is at 60 ℃, is reduced by 4-20 percent; the low molecular weight trans-butadiene-isoprene copolymer rubber has the advantages that the molar content of a butadiene unit is 5-70%, the molar content of an isoprene unit is 95-30%, the molar content of a trans-1, 4-structure is more than 85%, the Mooney viscosity tested at 100 ℃ for 3+4 minutes is 10-30, the weight average molecular weight is 5000-20000, and the molecular weight distribution is 5-45.
2. The high-performance tire tread rubber according to claim 1, wherein the antioxidant is one or more of antioxidant RD, antioxidant 4020 and antioxidant NA.
3. The high performance tire tread rubber of claim 1, wherein said carbon black is one or more of N110, N234, N330, N375, N339; the white carbon black is one or more of gas-phase white carbon black and precipitation white carbon black; the silane coupling agent is one or more of bis-gamma-triethoxysilylpropyl-tetrasulfide Si69, gamma-aminopropyltriethoxysilane KH-550 and gamma-methacryloxypropyltrimethoxysilane KH-570; the promoter is one or more of NOBS, CZ, DM and TMTD.
4. The high-performance tire tread rubber according to claim 1, wherein the other auxiliary agents are one or more of a scorch retarder, an aromatic oil and paraffin wax.
5. The high-performance tire tread rubber according to claim 1, wherein when a common vulcanization system is adopted, the amount of the accelerator is 0.5 to 0.6 part, and the amount of the sulfur is 2 to 3 parts; when an effective vulcanization system is adopted, the using amount of the accelerator is 3-5 parts, and the using amount of the sulfur is 0.3-0.5 part; when a semi-effective vulcanization system is adopted, the using amount of the sulfur is 0.8-1.5 parts, and the using amount of the accelerator is 0.8-1.5 parts.
6. A method for preparing the high-performance tire tread rubber of any one of claims 1 to 5, comprising the following steps:
first-stage banburying:
firstly, putting all raw rubber including natural rubber, butadiene rubber and low-molecular-weight trans-butadiene-isoprene copolymer rubber into an internal mixer, and carrying out internal mixing for 1-5 min;
adding zinc oxide, stearic acid, an anti-aging agent and other auxiliary agents, and banburying for 1-6 min;
thirdly, all carbon black is added and banburying is carried out for 2-12 min;
fourthly, adding the white carbon black and the silane coupling agent, and banburying for 4-15 min;
cleaning the upper top plug;
sixthly, banburying for 5-20 min, discharging rubber, and standing for 0.1-5 hours at room temperature to obtain a section of dense rubber;
wherein the first-stage banburying temperature is 50-70 ℃, the rotating speed of the banbury mixer is 40-100 r/min, the rubber discharge temperature is 145-155 ℃, and the rubber discharge temperature can be controlled by controlling the rotating speed of a rotor and a cooling system of the banbury mixer;
two-stage banburying:
adding the first-stage rubber compound into an internal mixer, and carrying out internal mixing for 5-15 min to remove rubber to obtain a second-stage masterbatch; wherein the two-stage banburying temperature is 50-70 ℃, and the rotating speed of the banbury mixer is 40-70 r/min;
open mixing:
putting the two-stage masterbatch into an open mill, 2mm open mill wrapping rollers, adding an accelerator and sulfur, cutting rubber for 3/4 at the left and the right times respectively, thinly passing the rubber by 0.2mm, and packaging the rubber for six times in a triangular manner, and then cutting the rubber by the 2mm wrapping rollers to obtain rubber compound; standing at 23 ℃ for 24-72 h and then vulcanizing; wherein the open milling temperature is 40-80 ℃, the rotating speed of a slow roller of the open mill is 30-60 r/min, and the rotating speed ratio of double rollers of the open mill is 1.4: 1-1.1: 1;
or
First-stage banburying:
firstly, putting all natural rubber and butadiene rubber into an internal mixer, and carrying out internal mixing for 1-5 min;
adding zinc oxide, stearic acid, an anti-aging agent and other auxiliary agents, and banburying for 1-6 min;
thirdly, all carbon black is added and banburying is carried out for 2-12 min;
fourthly, adding the white carbon black and the silane coupling agent, and banburying for 4-15 min;
cleaning the upper top plug;
sixthly, adding low molecular weight trans butadiene-isoprene copolymer rubber, pressing a top bolt, banburying for 6-25 min, then discharging rubber, and standing for 0.1-5 hours at room temperature to obtain a section of dense rubber;
wherein the first-stage banburying temperature is 50-70 ℃, the rotating speed of the banbury mixer is 40-100 r/min, the rubber discharge temperature is 145-155 ℃, and the rubber discharge temperature can be controlled by controlling the rotating speed of a rotor and a cooling system of the banbury mixer;
two-stage banburying:
adding the first-stage rubber compound into an internal mixer, and carrying out internal mixing for 5-15 min to remove rubber to obtain a second-stage masterbatch; wherein the two-stage banburying temperature is 50-70 ℃, and the rotating speed of the banbury mixer is 40-70 r/min;
open mixing:
putting the two-stage masterbatch into an open mill, 2mm open mill wrapping rollers, adding an accelerator and sulfur, cutting rubber for 3/4 left and right three times respectively, thinly passing through for 0.2mm, wrapping for six times by a triangular bag, and feeding sheets by the 2mm wrapping rollers to obtain a rubber compound, standing at 23 ℃ for 24-72 h, and vulcanizing; wherein the open milling temperature is 40-80 ℃, the rotating speed of the slow roller of the open mill is 30-60 r/min, and the rotating speed ratio of the double rollers of the open mill is 1.4: 1-1.1: 1.
7. The method for preparing the high-performance tire tread rubber according to claim 6, wherein the vulcanization temperature of the rubber compound is 130 ℃ to 155 ℃ and the vulcanization time is 5min to 30 min.
8. The preparation method of the high-performance tire tread rubber according to claim 6, wherein the low-molecular-weight trans-butadiene-isoprene copolymer rubber is applied to the tire tread rubber, the tensile strength of vulcanized rubber is improved by 15-20%, the tear strength is improved by 1-20%, the loss factor at 60 ℃ is reduced by 4-20%, and the abrasion is reduced by 10-25%.
9. The high performance tire tread compound of claim 1, wherein the tread compound is applied to truck tire treads and giant tire treads.
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