CN114316393A - Rubber composition special for RFT tire tread, mixing method and tire - Google Patents
Rubber composition special for RFT tire tread, mixing method and tire Download PDFInfo
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- CN114316393A CN114316393A CN202111624616.2A CN202111624616A CN114316393A CN 114316393 A CN114316393 A CN 114316393A CN 202111624616 A CN202111624616 A CN 202111624616A CN 114316393 A CN114316393 A CN 114316393A
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Abstract
The invention relates to the technical field of novel materials for manufacturing tires, in particular to a rubber composition specially used for RFT tire treads, a mixing method and a tire. The invention starts with a rubber system and a filler system of a tread formula and a vulcanization system of the formula, uses non-modified solution polymerized styrene-butadiene rubber as a formula main body, takes high-dispersion and ultrahigh-ratio surface white carbon black with low rolling resistance as a main filler, improves the vulcanization system, adjusts the proportion of single, double and polysulfide bonds in the formula, and finally achieves the purpose of improving the abrasion performance while ensuring the low rolling resistance of the tire.
Description
Technical Field
The invention relates to the technical field of novel materials for manufacturing tires, in particular to a rubber composition specially used for RFT tire treads, a mixing method and a tire.
Background
Along with the gradual improvement of safety consciousness of people, the requirement on the safety performance of vehicles is improved, and statistics shows that more than 50 percent of vehicle owners die due to tire burst in serious traffic accidents of the vehicles every year. The reason is that tires explode suddenly when a vehicle runs at a high speed, four wheels of a car lose balance due to sudden pressure loss of the tires, and a steering wheel and a direction of the car lose control, so that the vehicle is turned over, and further serious traffic accidents occur.
In order to avoid the above accidents, in recent years a new type of tyre comprising a support cement structure has come into existence, also known as "run flat tire", which is a run flat tire (RFT tire) intended to be a flat tire, which is commonly translated by the tyre industry as "run flat tire".
After a common tire is punctured by foreign objects, air leaks quickly, then the tire side collapses, the tire bead is separated from the rim, the common tire cannot run continuously if the tire bead is light, and the common tire can overturn if the tire bead is heavy. Compared with the prior art, after the RFT tire is punctured, the tire can keep a running profile due to the existence of the supporting cement structure, and the tire bead is still fixed on the wheel rim, so that the automobile can run stably for a long time or temporarily. After the automobile is provided with the tire, the safety performance is greatly improved, and a spare tire is not required to be carried.
Because the support rubber needs high hardness, a higher part of carbon black filler needs to be filled, so that the support rubber has higher heat generation; the weight of the RFT tire is greatly increased due to the thick sidewall supporting rubber of the RFT tire, for example 225/45R17, the weight of a common tire is generally 10.0kg, the weight of the RFT tire is about 11.5kg, and the increasing amplitude is as high as 15 percent.
Because the thickness of the sidewall supporting rubber of the RFT tire is thick, and the rubber is a poor thermal conductor, the RFT tire needs to be vulcanized for a long time, the vulcanizing time is more than twice of that of a common tire, so that the tread rubber is seriously over-vulcanized, and the physical performance and the abrasion performance are sharply reduced; meanwhile, as the modulus of the sidewall supporting rubber of the RFT tire is high, the rigidity is high, the sidewall hardly deforms when a severe road passes through a foreign matter obstacle, the deformation amount of the tread is increased, the deformation energy generated by the foreign matter is almost absorbed by the tread, the abrasion of the RFT tire is reduced due to a series of reasons, the best mode for improving the abrasion is to increase the using amount of the filler, the increase of the rolling resistance of the RFT tire is inevitable, the rolling resistance of the RFT tire is always at a higher level due to the structural particularity, and if the rolling resistance is increased again, the risk of degradation and even de-marking of a label method can be met.
Disclosure of Invention
In order to solve the technical problems, the invention starts with a rubber system and a filler system of a tread formula and a vulcanization system of the formula, uses non-modified solution polymerized styrene-butadiene rubber as a formula main body, takes high-dispersion and ultrahigh-ratio surface white carbon black with low rolling resistance as a main filler, improves the vulcanization system, adjusts the proportion of single, double and polysulfide bonds in the formula, and finally achieves the purpose of improving the abrasion performance while ensuring the low rolling resistance of the tire.
In order to achieve the purpose, the invention adopts the following technical scheme:
the rubber composition for the tire tread is characterized by being prepared by mixing the following raw materials in parts by weight:
100 parts of solution polymerized styrene-butadiene rubber;
5.0-15.0 parts of modified liquid butadiene rubber;
5.0-15.0 parts of liquid butadiene rubber;
100.0-140.0 parts of white carbon black;
0.5-20.0 parts of carbon black;
15.0-21.0 parts of silane coupling agent;
40.0-50.0 parts of anti-slippery resin;
3.0-8.0 parts of white carbon black dispersing agent;
0.5-1.0 part of sulfur;
1.0-2.0 parts of accelerator A;
1.0-2.5 parts of accelerator B;
1.0-3.0 parts of anti-vulcanization and anti-reversion agent;
in the solution polymerized styrene-butadiene rubber, the mass of styrene accounts for 10-15% of the total weight of the polymer, and the mass of vinyl accounts for 30-40% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of the white carbon black is 200-300m2(ii)/g; the carbon black is super wear-resistant carbon black with the particle size of 11-19 nm; the accelerator A is N-tertiary butyl-2-benzothiazole sulfonamide, the accelerator B is tetrabenzylthiuram disulfide, and the anti-reversion agent is 1, 6-bis (N, N-dibenzothiazyl carbamyl disulfide) -hexane;
the structural formula of the modified liquid butadiene rubber is as follows:
wherein, the cis-butadiene content x is 15-25%, the trans-butadiene y is 50-65%, the vinyl z is 20-25%, and R is C1-C3 alkyl;
the structural formula of the liquid butadiene rubber is as follows:
wherein, the cis-butadiene content x is 70-85%, the trans-butadiene content y is 20-25%, and the vinyl content z is 0.5-2.0%.
Preferably, the silane coupling agent is Si747, and the using amount of the silane coupling agent is 12.0-16.0% of the using amount of the white carbon black.
Preferably, the anti-slippery resin is an alpha-methyl styrene modified resin.
Preferably, the modified liquid butadiene rubber is POLYVEST EP ST-E60, wherein the cis-butadiene content x is 20%, the trans-butadiene y is 58%, and the vinyl z is 22%; the liquid butadiene rubber is POLYVEST 130S, wherein the cis-butadiene content x is 77%, the trans-butadiene content y is 22%, and the vinyl content z is 1%.
Preferably, the rubber composition further comprises a rubber activator, a rubber antioxidant and a rubber vulcanizing agent.
As a further preference, the rubber activator is zinc oxide and stearic acid: 2.0 to 4.0 parts by weight of zinc oxide and 1.0 to 3.0 parts by weight of stearic acid; the rubber antioxidant adopts antioxidant 6PPD, RD and microcrystalline wax: 1.0 to 3.0 parts by weight of 6PPD, 1.0 to 3.0 parts by weight of RD, and 1.0 to 3.5 parts by weight of microcrystalline wax.
Furthermore, the invention also discloses a mixing method of the rubber composition in any technical scheme, which adopts a series one-step internal mixer, controls the rotor speed of the internal mixer to be 40-60rpm, and controls the upper ram pressure to be 50-60N/cm2The temperature of the cooling water of the internal mixer is 30-40 ℃, and the method comprises the following steps:
firstly, an upper auxiliary machine process:
adding rubber, white carbon black, a silane coupling agent, zinc oxide, stearic acid, an anti-aging agent and microcrystalline wax, and lowering the top plug for 30 seconds;
lifting the top bolt, and keeping for 10 seconds;
lowering the top bolt to raise the temperature of the rubber material to 100 deg.c;
fourthly, lifting the top plug, adding softening oil, and keeping for 5 seconds;
lowering the upper top bolt to heat the rubber material to 140 ℃;
lowering the top plug to mix the rubber material at 140-145 deg.c for 120 sec;
and discharging the rubber material to a lower auxiliary machine.
II, auxiliary machine process:
firstly, heating the sizing material to 140 ℃;
② mixing at 140-145 ℃ for 300 seconds;
thirdly, rubber discharging to an open mill: turning and cooling the rubber material to 90-100 ℃, adding sulfur and a vulcanization accelerator on an open mill, uniformly dispersing, and cooling the lower piece to room temperature.
Furthermore, the invention also discloses an RFT tire, and the tread rubber of the tire is prepared by vulcanizing the rubber composition according to any one of the technical schemes.
Due to the adoption of the technical scheme, the invention has the following characteristics:
1. a rubber system: in recent years, in order to further reduce the rolling resistance of tires, part of solution polymerized styrene-butadiene rubber manufacturers have proposed modified solution polymerized styrene-butadiene rubber, namely, functional groups capable of reacting with fillers are added in the polymerization process of the solution polymerized styrene-butadiene rubber, so as to increase the dispersion of the fillers and reduce the rolling resistance of tires. However, the added modified functional groups have high activity and poor aging resistance, are very easy to denature and break under the high-temperature over-sulfur state, and meanwhile, because modification treatment is needed, the production process is changed from continuous production to intermittent production, so that the molecular weight of the rubber is reduced, and the physical performance and the abrasion performance are reduced. Therefore, the invention takes the non-modified solution polymerized styrene-butadiene rubber with low rolling resistance as the main rubber body, and improves the aging resistance and the over-sulfur resistance of the formula.
2. Softening and plasticizing system: rubber operating oil is generally used as a softening plasticizer in the tire industry, but the softening plasticizer has a small molecular weight, so that the abrasion performance of rubber materials is reduced after the softening plasticizer is added, and the rubber operating oil has a small double bond content, so that the rubber operating oil hardly reacts with rubber, and the problems of hardening of the rubber materials caused by late migration, and reduction of physical properties and abrasion performance exist. Therefore, the modified liquid butadiene rubber and the liquid butadiene rubber are used as the softening plasticizer, so that the processing performance of the rubber material is improved, and the abrasion performance of the rubber material is improved; meanwhile, high molecular weight resin is used as a softening plasticizer, so that the abrasion performance of the sizing material is further improved while the glass transition temperature (Tg) of the sizing material is adjusted.
3. A filler system: the reinforcing filler largely used in the tire field mainly comprises two types of carbon black and white carbon black, and the two types of fillers respectively have the advantages that: the wear of the carbon black is good, the rolling resistance of the white carbon black is low, and the RFT tire has higher requirements on two performances, so that the invention uses the white carbon black SW with ultrahigh specific surface area and high dispersion, improves the wear and simultaneously ensures the low rolling resistance of the formula, and the silane coupling agent used with the white carbon black selects the mercaptosilane with low heat generation because the filling amount of the white carbon black is higher; meanwhile, the wear resistance of the tire is further improved by using the high-structure-degree carbon black N134, and the proportion and the dosage of the high-structure-degree carbon black and the high-structure-degree carbon black are optimized through experiments, so that the balance between wear and rolling resistance is achieved.
4. A vulcanization system: sulfur vulcanization can generate single sulfur bonds, disulfide bonds, polysulfide bonds and the like, and the single sulfur bonds and the disulfide bonds have low heat generation, good aging resistance and poor physical properties; the polysulfide bond has high heat generation and is not resistant to aging, but has excellent physical properties. The modern rubber formula generally uses an EV vulcanization system, the number of various sulfur bonds is adjusted by adjusting the proportion of sulfur and an accelerant, the proportion of various sulfur bonds is moderate, and the comprehensive performance is good. However, because the RFT tire is long in vulcanization time and the rubber compound is inevitably in an over-vulcanized state, the invention uses an ultra-high-sulfur ultra-low vulcanization-promoting system, so that the vulcanization crosslinking bond type mainly comprises single sulfur and double sulfur, the heat generation of the rubber compound is reduced, and the conditions of modulus increase and physical property decrease caused by the fracture recombination at the later stage of the multi-sulfur bond are avoided. Meanwhile, an anti-vulcanization anti-reversion agent is added, so that the aging resistance and the over-vulcanization anti-reversion performance of the formula are improved.
To sum up, adopt above-mentioned technical scheme's beneficial effect to be: in the invention, the wear resistance and the aging resistance of the formula can be improved by singly using the non-modified solution polymerized styrene-butadiene rubber with low glass transition temperature; in order to adjust the glass transition temperature of the sizing material, a large amount of alpha-methyl styrene modified resin is used, so that the glass transition temperature of the sizing material is increased, and the processability and the abrasive property of the sizing material are improved; the softener selects the modified liquid butadiene rubber and the liquid butadiene rubber, so that the wear resistance and the aging resistance of the formula are improved; according to the invention, a large amount of white carbon black with ultrahigh specific surface area and super wear-resistant carbon black are filled, so that the abrasion of the sizing material is improved, and meanwhile, mercaptosilane is used, so that the dispersion of the white carbon black is improved, and the heat generation of the sizing material is reduced; the invention uses an ultra-high sulfur ultra-low vulcanization-promoting system, so that the vulcanization crosslinking bond type mainly comprises single sulfur and double sulfur, the heat generation of rubber materials is reduced, the conditions of modulus increase and physical property reduction caused by the fracture recombination at the later stage of the multi-sulfur bond are avoided, and meanwhile, an anti-vulcanization anti-reversion agent is used for assisting, the heat stability and anti-reversion property of the formula are improved, the heat generation is reduced, and the abrasion is improved.
In the rubber composition of the present invention, in addition to the above components, various additives such as other fillers, vulcanizing agents, vulcanization accelerators, various types of oils, antioxidants, plasticizers, and the like, which are generally used in tires and other rubber compositions, may be mixed. These additives are mixed in a conventional manner to obtain a rubber composition which can be used for vulcanization. The amounts of these additives may also be conventional and customary mixing amounts, provided that the object of the invention is not adversely affected.
Detailed Description
The technical solutions in the embodiments of the present invention will be examined and completely described below with reference to the embodiments of the present invention, so as to further explain the invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Examples 1 to 7 (examples 2 to 6 are comparative examples) are specifically shown in Table 1 (parts by weight).
Table 1 examples 1-7 recipe details
TABLE 1 footnotes
*1: SL553, 10% by weight of the total styrene mass station polymer and 40% by weight of the total butadiene based on the vinyl group, manufactured by JSR Corp, by a continuous process;
*2: HPR840, 10% of the total weight of the styrene mass station polymer, 40% of vinyl in the total weight of butadiene, and the tail end of a rubber molecular chain is modified aiming at white carbon black, and is produced by a batch method from JSR products;
*3: POLYVEST EP ST-E60, wherein the cis-butadiene content is 20%, the trans-butadiene content is 58%, the vinyl content is 22%, and the product of Evonik Resource Efficiency GmbH;
*4: POLYVEST 130S having a cis-butadiene content of 77%, trans-butadiene content of 22%, vinyl content of 1%, product of Evonik Resource Efficiency GmbH;
*5: v700, Ningbo Han Sheng chemical products;
*6: premium SW, cetyltrimethylammonium bromide (CTAB) ═ 250m2(iv)/g, Solvay chemical products;
*7: 1165MP, Cetyl Trimethyl Ammonium Bromide (CTAB) ═ 160m2(iv)/g, Solvay chemical products;
*8: n134, cabot chemical products;
*9: n330, a cabot chemical product;
*10: si747, a product of Jiangsu Qi Xiang high-new materials Co., Ltd;
*11: si137, product of new material of chinese arborvitae ltd;
*12: si69, product of Jiangxi Hongbai New Material Co., Ltd.;
*13: SYLVATRAXX 4401, a product of kraton chemical ltd;
*14: SPA, product of dada nanomaterials, wilhon;
*15: S200-10S Fufang Fuhong chemical industry Limited company product;
*16: NS, product of langson chemical ltd;
*17: TBzTD, product of Wuhan Yuehe chemical Co., Ltd;
*18: WY988, a product of Kyoho Kangxin materials Co., Ltd;
the rest raw materials are commercial industrial products.
Preparation of a sample: (the process uses a tandem one-shot internal mixer)
Controlling the rotor speed of an internal mixer to be 40-60rpm, the upper plug pressure to be 50-60N/cm2 and the cooling water temperature of the internal mixer to be 30-40 ℃, and comprising the following steps:
firstly, an upper auxiliary machine process:
adding rubber, white carbon black, a silane coupling agent, zinc oxide, stearic acid, an anti-aging agent and microcrystalline wax, and lowering the top plug for 30 seconds;
lifting the top bolt, and keeping for 10 seconds;
lowering the top bolt to raise the temperature of the rubber material to 100 deg.c;
fourthly, lifting the top plug, adding softening oil, and keeping for 5 seconds;
lowering the upper top bolt to heat the rubber material to 140 ℃;
lowering the top plug to mix the rubber material at 140-145 deg.c for 120 sec;
and discharging the rubber material to a lower auxiliary machine.
II, auxiliary machine process:
firstly, heating the sizing material to 140 ℃;
② mixing at 140-145 ℃ for 300 seconds;
thirdly, rubber discharging to an open mill: turning and cooling the rubber material to 90-100 ℃, adding sulfur and a vulcanization accelerator on an open mill, uniformly dispersing, and cooling the lower piece to room temperature.
The rubber composition obtained by kneading was vulcanized in a mold prepared in advance under conditions of 160 ℃ for 15min and a pressure of 15 MPa. Then, the properties of the vulcanized rubber were measured by the following test methods, and the measurement results are shown in Table 2.
Test method for evaluating rubber performance
Physical properties:
the hardness at room temperature was measured based on GB/T531.1-2008, and the results are shown in Table 2, where the larger the value, the higher the hardness.
The tensile strength determined based on GB/T528-. Further, the elongation at break during the same test period is shown as "elongation at break". The product of tensile strength and elongation at break is shown as the "tensile product" in table 2. The larger the value, the higher the reinforcement and the better the physical properties. The aging condition of the physical property after aging is 100 ℃ for 48 hours, the ratio of the tensile product after aging to the tensile product before aging is the heat aging retention rate, and the larger the value is, the better the aging resistance is.
Abrasion resistance-Akron abrasion:
the attone abrasion determined based on GB/T1689-. The smaller the value, the less wear and the more excellent the wear resistance.
Dynamic performance-Dynamic thermo-mechanical analysis (DMA):
measured by using a dynamic thermomechanical analyzer model VR-7120 manufactured by UESHIMA corporation of Japan. The test conditions were: a stretching mode; frequency, 12 Hz; strain, 7% ± 0.25%; temperature rise is carried out at 2 ℃/min. The results are shown in table 2. The tan delta value at 0 ℃ represents the wet land holding capacity of the vulcanized rubber, and the larger the value is, the better the wet land holding capacity of the tire prepared by the vulcanized rubber is; the tan delta value at 60 ℃ characterizes the hysteresis loss of the vulcanized rubber, the smaller this value, the lower the hysteresis loss of the vulcanized rubber and the lower the rolling resistance of the tyre obtained; the temperature at which the maximum tan δ corresponds is the Tg of the vulcanizate, the lower the Tg, the better the winter performance of the vulcanizate.
Table 2 examples 1-7 test results
As can be seen from the comparison of examples 1-2, when the modified solution-polymerized styrene-butadiene rubber HPR840 is used in place of the unmodified solution-polymerized styrene-butadiene rubber SL553, the physical properties of the compound are reduced because the manufacturing process of the modified solution-polymerized styrene-butadiene rubber is a batch process, and the physical properties are reduced because the molecular weight of the HPR840 is low compared to the SL553 which is produced by a continuous process; meanwhile, the dynamic performance of the embodiment 2 is better than that of the embodiment 1, because the HPR840 contains a large amount of modified groups, the modified groups can act with the white carbon black to improve the dispersion of the white carbon black, but the modified groups have high activity and are easy to generate cracking reaction at high temperature, so that the heat aging retention rate of the embodiment 2 is reduced.
As can be seen by comparing examples 1-3, when TDAE is used as the softener in the compound, the physical properties of the compound are reduced due to the low molecular weight of TDAE; the aging resistance of example 3 is also greatly reduced, which is caused by that TDAE contains a large amount of benzene, toluene, xylene, ethylbenzene, etc., and is easily reacted with oxygen in the air; meanwhile, the Tg of example 3 is obviously reduced, and the wet skid performance is reduced, which is caused by that the Tg of TDAE is lower than that of the wet skid resistant resin SYLVATRAXX 4401.
It can be seen from comparison of examples 1-4 that, when the filler in the formulation is changed to 1165MP with low specific surface area and N330 with low structure degree, the hardness of the compound is obviously reduced, because the specific surface area of the filler is reduced, the effect with the rubber is reduced, the reinforcing capability is reduced, if the same reinforcing effect is required to be achieved, the use amount of the filler needs to be increased, which causes deterioration of properties such as rolling resistance of the formulation, and thus is unacceptable.
It can be seen from comparison of examples 1-5 that when sulfur-containing silane Si69 is used instead of mercaptosilane Si747, the dynamic properties of the compound are reduced due to the lower reactivity of the sulfur-containing silane crown energy group-S compared to the mercapto silane-SH and the reduced dispersion of white carbon black, while the aging resistance of example 5 is reduced due to the lower reactivity of the sulfur-containing silane Si69, incomplete reaction and the release of sulfur atoms from unreacted Si69 during aging process to continue to participate in the vulcanization.
It can be seen from comparison of examples 1-6 that the aging resistance and dynamic performance of the compound are reduced when the vulcanization system of the formulation is changed to a common vulcanization system, which is caused by the increase of the ratio of polysulfide bonds in the common vulcanization system and the cracking and rearrangement of the polysulfide bonds during the aging process.
It can be seen by comparing examples 1-7 that the aging resistance of the formulations is significantly reduced when no anti-reversion agent is used in the formulation.
A batch of 205/55R 1691V size tires were prepared from the compound of example 1 and tested for a full tire, the results of which are shown in table 3.
Table 3 example 1 stock trial tire machine tool performance data
From the data in table 3, it can be seen that the high speed and durability performance of the tires as trial produced by the present invention meet the regulatory requirements while the labeling grade of the tires is a double B grade.
Industrial applicability
According to the invention, the tire with high label grade and excellent wear resistance can be manufactured. The present invention may be used for, but is not limited to, tire tread manufacture for RFT tires.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including any reference to the above-mentioned embodiments. 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 (8)
1. The rubber composition for the tire tread is characterized by being prepared by mixing the following raw materials in parts by weight:
100 parts of solution polymerized styrene-butadiene rubber;
5.0-15.0 parts of modified liquid butadiene rubber;
5.0-15.0 parts of liquid butadiene rubber;
100.0-140.0 parts of white carbon black;
0.5-20.0 parts of carbon black;
15.0-21.0 parts of silane coupling agent;
40.0-50.0 parts of anti-slippery resin;
3.0-8.0 parts of white carbon black dispersing agent;
0.5-1.0 part of sulfur;
1.0-2.0 parts of accelerator A;
1.0-2.5 parts of accelerator B;
1.0-3.0 parts of anti-vulcanization and anti-reversion agent;
in the solution polymerized styrene-butadiene rubber, the mass of styrene accounts for 10-15% of the total weight of the polymer, and the mass of vinyl accounts for 30-40% of the total weight of butadiene; the nitrogen adsorption specific surface area (BET) of the white carbon black is 200-300m2(ii)/g; the carbon black is super wear-resistant carbon black with the particle size of 11-19 nm; the accelerator A is N-tertiary butyl-2-benzothiazole sulfonamide, the accelerator B is tetrabenzylthiuram disulfide, and the anti-reversion agent is 1, 6-bis (N, N-dibenzothiazyl carbamyl disulfide) -hexane;
the structural formula of the modified liquid butadiene rubber is as follows:
wherein, the cis-butadiene content x is 15-25%, the trans-butadiene y is 50-65%, the vinyl z is 20-25%, and R is C1-C3 alkyl;
the structural formula of the liquid butadiene rubber is as follows:
wherein, the cis-butadiene content x is 70-85%, the trans-butadiene content y is 20-25%, and the vinyl content z is 0.5-2.0%.
2. The rubber composition for a tire tread according to claim 1, wherein the silane coupling agent is Si747, and the amount of the silane coupling agent is 12.0-16.0% of the amount of the white carbon black.
3. The rubber composition for a tire tread according to claim 1, wherein said anti-hydroplaning resin is an α -methylstyrene modified resin.
4. The rubber composition for a tire tread of claim 1, wherein said modified liquid polybutadiene rubber is POLYVEST EP ST-E60, wherein the cis-butadiene content x is 20%, the trans-butadiene content y is 58%, and the vinyl content z is 22%; the liquid butadiene rubber is POLYVEST 130S, wherein the cis-butadiene content x is 77%, the trans-butadiene content y is 22%, and the vinyl content z is 1%.
5. The rubber composition for a tire tread according to claim 1, wherein said rubber composition further comprises a rubber activator, a rubber antioxidant and a rubber vulcanizing agent.
6. The rubber composition for a tire tread according to claim 5, wherein the rubber activator comprises zinc oxide and stearic acid: 2.0 to 4.0 parts by weight of zinc oxide and 1.0 to 3.0 parts by weight of stearic acid; the rubber antioxidant adopts antioxidant 6PPD, RD and microcrystalline wax: 1.0 to 3.0 parts by weight of 6PPD, 1.0 to 3.0 parts by weight of RD, and 1.0 to 3.5 parts by weight of microcrystalline wax.
7. The method for mixing a rubber composition according to claim 6, wherein the method comprises using a tandem one-shot internal mixer, and controlling the rotor speed of the internal mixer to 40 to 60rpm and the ram-up pressure to 50 to 60N/cm2The temperature of the cooling water of the internal mixer is 30-40 ℃, and the method comprises the following steps:
firstly, an upper auxiliary machine process:
adding rubber, white carbon black, a silane coupling agent, zinc oxide, stearic acid, an anti-aging agent and microcrystalline wax, and lowering the top plug for 30 seconds;
lifting the top bolt, and keeping for 10 seconds;
lowering the top bolt to raise the temperature of the rubber material to 100 deg.c;
fourthly, lifting the top plug, adding softening oil, and keeping for 5 seconds;
lowering the upper top bolt to heat the rubber material to 140 ℃;
lowering the top plug to mix the rubber material at 140-145 deg.c for 120 sec;
and discharging the rubber material to a lower auxiliary machine.
II, auxiliary machine process:
firstly, heating the sizing material to 140 ℃;
② mixing at 140-145 ℃ for 300 seconds;
thirdly, rubber discharging to an open mill: turning and cooling the rubber material to 90-100 ℃, adding sulfur and a vulcanization accelerator on an open mill, uniformly dispersing, and cooling the lower piece to room temperature.
8. An RFT tire, characterized in that, the tread rubber of the tire is prepared by the rubber composition of any one of claims 1-6 through vulcanization.
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| CN115678122A (en) * | 2022-11-07 | 2023-02-03 | 中策橡胶集团股份有限公司 | A kind of tread rubber of low heat generation tire, preparation method, application and low heat generation load radial tire |
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