CN111499933A - Low-heat-generation puncture-resistant engineering radial tire base rubber composition and preparation method thereof - Google Patents
Low-heat-generation puncture-resistant engineering radial tire base rubber composition and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a low-heat-generation puncture-resistant engineering radial tire base rubber composition and a preparation method thereof, and belongs to the technical field of tires. The technical scheme is as follows: the feed comprises the following raw materials in parts by weight: 100 parts of natural rubber, 25-33 parts of white carbon black, 18-25 parts of special carbon black, 3-6 parts of silane coupling agent, 3-5 parts of zinc oxide, 2-4 parts of stearic acid, 1-2 parts of protective wax, 3-5 parts of anti-aging agent, 1-1.7 parts of sulfur powder, 1.1-1.7 parts of vulcanization accelerator, 0.15-0.3 part of silane active agent and 0.1-0.3 part of scorch retarder. The low-heat-generation puncture-resistant engineering radial tire base rubber composition is used for an engineering radial tire base, and can meet the use scenes of long distance, high speed, high TKPH value requirement and certain puncture resistance.
Description
Technical Field
The invention relates to the technical field of tires, in particular to a low-heat-generation puncture-resistant engineering radial tire base rubber composition and a preparation method thereof.
Background
The engineering machinery vehicle usually runs in a relatively severe scene, the distance of a mine for transporting ore and waste slag is longer and longer along with the increase of the mining years of each large-scale mine in recent years, and the speed of the mine is faster and faster for improving the efficiency. For the scenes with long distance, fast speed and broken stone road conditions, the TKPH value and puncture resistance of the tire have higher requirements. At present, a formula of a low-heat-generation tire base rubber is researched by a domestic tire manufacturer, but the tire heat generation still cannot meet the scenes that the tire has long distance (more than 10 km), high speed and extremely high TKPH value requirements, and the tire is low in service life due to the fact that heat generation and delamination are failed in the early stage of use. And the puncture resistance of the tire is mainly researched by puncture resistant tread rubber, the research on tire base rubber is less, and the pattern groove bottom of the engineering radial tire is easy to puncture by broken stones to cause failure in use.
The Chinese patent with the application number of 201910744164.8 discloses a puncture-resistant and tear-resistant tread base rubber and a preparation method thereof, and mainly aims to improve the puncture-resistant performance and tear resistance of the tread base rubber. According to the formula of the patent, modified dicyclopentadiene (DCPD resin) and a certain amount of white carbon black are added into a sizing material to improve the puncture resistance of the sizing material, and the using amount of the white carbon black is 5-20 parts. The base rubber of this patent formula mainly improves puncture-resistant tear resistance, adopts super wear-resisting carbon black in the 2 series, does not pay attention to reducing the themogenesis, and the themogenesis of sizing material is higher relatively, and the formula can only be applicable to the scene that the road conditions is relatively abominable, not high to TKPH value, can't satisfy that the distance to fortune is long, the speed of a motor fast requires high scene to TKPH value.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the low-heat-generation puncture-resistant engineering radial tire base rubber composition is used for an engineering radial tire base, and can meet the use scenes of long distance, high speed, high TKPH value requirement and certain puncture resistance.
The technical scheme of the invention is as follows:
in a first aspect, the invention provides a low-heat-generation puncture-resistant engineering radial tire base rubber composition, which comprises the following raw materials in parts by weight:
according to the invention, the white carbon black with high filling amount is adopted, the active group on the surface of the white carbon black can interact with rubber molecules to form a chemical bond, the tearing strength of the rubber material can be effectively improved and the puncture resistance performance can be improved by adding the white carbon black into the natural rubber, and meanwhile, the heat generation of the rubber material can be reduced and the puncture resistance performance can be improved by increasing the using amount of the white carbon black in the reinforcing system and reducing the using amount of the carbon black because the heat generation of the carbon black rubber material is higher than that of the white carbon black. The high-dispersion white carbon black is adopted, so that the dispersion of the white carbon black is improved, and the influence on the performance of a sizing material caused by the uneven dispersion of the white carbon black in rubber when the amount of the white carbon black is high is avoided.
Preferably, the special carbon black adopts Bester B L360 special carbon black.
The reinforcing system is formed by combining white carbon black and special carbon black B L360, wherein the special carbon black has high specific surface area and structure degree, better dispersity and bonding performance with rubber compared with 3 series of carbon black, and the rubber material adopting the special carbon black B L360 has low heat generation, high tearing strength and excellent puncture resistance.
Preferably, the silane coupling agent has the structure
The invention adopts the sulfo-octanoyl group of the silane coupling agent to seal S, does not release S below 175 ℃ under the condition of no action of an activating agent to generate early vulcanization to cause scorching of a rubber material, can improve the mixing temperature, and increase the effective mixing time of master batch, so that the reaction of silane and white carbon black is more sufficient. The silane coupling agent has low content of 'O' element, reduces VOC emission amount when reacting with white carbon black, and reduces porosity of sizing material. The rubber composition using the silane coupling agent has reduced heat generation and improved strength.
Preferably, the protective wax is a mixture of microcrystalline wax and paraffin wax in a mass ratio of 2: 1.
Preferably, the vulcanization accelerator comprises 0.6 to 0.9 parts of accelerator CZ (N-cyclohexyl-2-benzothiazylsulfenamide) and 0.5 to 0.8 parts of accelerator DZ (N, N-dicyclohexyl-2-benzothiazylsulfenamide).
Preferably, the silane activator is accelerator DPG (diphenylguanidine). During vulcanization, when the temperature reaches above 120 ℃, the silane activating agent can release the thio-octanoyl group in the silane coupling agent, so that the silane reacts with the rubber to produce a C-S-C chemical bond, the heat generation of the rubber is reduced, and the strength and the puncture resistance are improved.
Preferably, the scorch retarder is the scorch retarder CTP (N-cyclohexylthiophthalimide).
In a second aspect, the invention also provides a preparation method of the low-heat-generation puncture-resistant engineering radial tire base rubber composition, which comprises the following steps:
(1) preliminary mixing
Putting 100 parts by weight of natural rubber and 12 parts by weight of white carbon black into a mixing chamber of a GK255 internal mixer, and extracting the rubber for 5s when the rotating speed of a rotor is 25-26rmb and the temperature of the rubber reaches 95-97 ℃; pressing the bolt again, and lifting the bolt for 5s when the temperature reaches 130-132 ℃; third time of plug pressing, mixing until the temperature of the rubber material reaches 160-162 ℃ and rubber discharging is carried out, thus obtaining natural rubber/white carbon black pre-mixed masterbatch;
first parking: the pre-mixed masterbatch is placed in the air to be cooled to the room temperature, and the storage time of the pre-mixed masterbatch is not more than 144 h;
(2) one-stage mixing
Putting premixed master batch, 5-11 parts of white carbon black, 18-25 parts of special carbon black, 3-5 parts of zinc oxide, 2-4 parts of stearic acid, 1-2 parts of protective wax and 3-5 parts of anti-aging agent 4020 into a mixing chamber of a GK255 internal mixer for mixing, wherein the rotor speed is 33-37rmb, and the rubber material is extracted for 5-8s when the temperature reaches 90-100 ℃; pressing the bolt again, and lifting the bolt for 5-8s when the temperature reaches 130-135 ℃; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 160-165 ℃ and discharging the rubber to obtain a section of masterbatch;
placing the first section of the master batch in air for cooling for 6-8 hours;
(3) two stage mixing
Putting the cooled primary rubber, 8-10 parts of white carbon black and 3-6 parts of silane coupling agent into a mixing chamber of a GK255 internal mixer for mixing, wherein the rotor speed is 32-35rmb, and the rubber material is subjected to bolt extraction for 5-8s when the temperature reaches 90-95 ℃; pressing the bolt again, and lifting the bolt for 5-8s when the temperature reaches 125-130 ℃; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 155-160 ℃, and discharging the rubber to obtain two-section masterbatch;
placing the second-stage masterbatch in air for cooling for 8-10h after the third standing;
(4) three stage mixing
Putting the cooled two-section master batch into a GK255 internal mixer for mixing, wherein the rotating speed of a rotor is 28-31rmb, and the bolt is extracted for 5-8s when the temperature of the rubber material reaches 90-95 ℃; pressing the bolt again, reducing the rotating speed of the rotor to 24-28rmb, and lifting the bolt for 5-8s when the temperature reaches 125-130 ℃; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 152-157 ℃, and discharging the rubber to obtain three-section master rubber;
placing the third section of master batch in air for cooling for 6-8h to room temperature;
(5) final refining
Putting the three-section master batch, 1-1.7 parts by weight of sulfur powder, 1.1-1.7 parts by weight of vulcanization accelerator, 0.15-0.3 part by weight of silane activator and 0.1-0.3 part by weight of scorch retarder into a GK255 internal mixer for mixing, wherein the rotor rotating speed is 18-21rmb, the first step of bolt pressing is 30-35s, and the bolt extraction is 5-8 s; pressing the bolt for 25-35s again, and extracting the bolt for 5-8 s; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 100-107 ℃ and discharging the rubber to obtain the low-heat-generation puncture-resistant tire base rubber composition;
and (3) placing the low-heat-generation puncture-resistant tire base rubber composition to room temperature for production and use of the tire, wherein in order to ensure the performance of the rubber composition and the process performance of the next working procedure in the using process, the low-heat-generation puncture-resistant tire base rubber composition obtained after final mixing and milling is used within 96 hours.
According to the invention, a white carbon black and rubber pre-mixing technology is adopted, and a part of white carbon black and natural rubber are pre-mixed to generate natural rubber/white carbon black master batch, so that the dispersion of white carbon black in rubber is improved, the heat generation of the final rubber composition is reduced, and the strength is improved.
Preferably, the special carbon black adopts Bester B L360 special carbon black, the protective wax is a mixture of microcrystalline wax and paraffin wax in a mass ratio of 2:1, the vulcanization accelerator comprises 0.6-0.9 part of accelerator CZ and 0.5-0.8 part of accelerator DZ, the silane active agent is accelerator DPG, the scorch retarder is scorch retarder CTP, and the silane coupling agent has the structure that
Compared with the prior art, the invention has the following beneficial effects:
1. the low-heat-generation puncture-resistant engineering radial tire base rubber composition is used for an engineering radial tire base, and can meet the use scenes of long distance, high speed, high TKPH value requirement and certain puncture resistance. The TKPH value of the engineering radial tire adopting the tire base rubber composition can be increased by more than 8%, the tire does not generate heat and delaminate in an early stage in a scene with long distance, high speed, high TKPH value requirement and broken stone road conditions, the puncture failure condition is greatly reduced, the comprehensive life of the tire can be effectively prolonged, the use cost of the tire is reduced by more than 25%, the claim withdrawal of the tire is reduced by more than 45%, the use cost of a client can be reduced, and the profit of a tire manufacturer can be improved.
2. Compared with the traditional tire base rubber composition, the tire base rubber composition has the advantages that the heat generation in compression is reduced by more than 15%, tan at 60 ℃ is reduced by more than 20%, the tensile strength is improved by more than 4%, and the tear strength is improved by more than 15%.
Detailed Description
Examples 1 to 3
The formulations of the base rubber compositions of examples 1 to 3 and comparative example 1 are shown in table 1, wherein the content units of the components in table 1 are parts by weight:
TABLE 1
The method of preparing the base rubber compositions of examples 1-3 includes the steps of:
(1) preliminary mixing
Putting all natural rubber and 12 parts by weight of white carbon black into a mixing chamber of a GK255 internal mixer, wherein the rotating speed of a rotor is 25rmb, and the rubber material is extracted for 5s when the temperature of the rubber material reaches 95-97 ℃; pressing the bolt again, and lifting the bolt for 5s when the temperature reaches 130-132 ℃; third time of plug pressing, mixing until the temperature of the rubber material reaches 160-162 ℃ and rubber discharging is carried out, thus obtaining natural rubber/white carbon black pre-mixed masterbatch;
placing the pre-mixed masterbatch in air for cooling for 9-10h to room temperature after the first standing;
(2) one-stage mixing
Putting all the pre-mixed master batch, special carbon black Bester B L360, zinc oxide, stearic acid, protective wax, an anti-aging agent 4020 and part of white carbon black into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotor speed is 33rmb, the plug is lifted for 7s when the temperature of the rubber material reaches 98-100 ℃, the plug is pressed again when the temperature reaches 133-135 ℃, the plug is lifted for 7s when the temperature reaches 133-135 ℃, the plug is pressed for the third time, and the rubber is discharged when the temperature of the rubber material reaches 165 ℃ during mixing, so that a section of master batch is obtained;
placing the first section of masterbatch in air for cooling for 7-8 h;
(3) two stage mixing
Putting the cooled primary rubber, the rest white carbon black and all the silane coupling agents into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotating speed of a rotor is 32rmb, and the mixing material is extracted for 7s when the temperature of the rubber material reaches 90-92 ℃; pressing the bolt again, and lifting the bolt for 7s when the temperature reaches 128-130 ℃; third-time bolt pressing, and rubber discharging when the temperature of the rubber material reaches 160 ℃ after mixing to obtain second-section master batch;
placing the second-stage masterbatch in air for cooling for 9-10h after the third standing;
(4) three stage mixing
Putting the cooled two-section master batch into a GK400 internal mixer for mixing, wherein the rotor rotation speed is 28rmb, and the bolt is extracted for 7s when the temperature of the rubber reaches 92-94 ℃; pressing the bolt again, reducing the rotating speed of the rotor to 24rmb, and lifting the bolt for 7s when the temperature reaches 128-; third-time bolt pressing, namely, mixing until the temperature of the rubber material reaches 157 ℃, and removing rubber to obtain three sections of master batch;
placing the third section of master batch in air for cooling for 7-8h to room temperature;
(5) final refining
Putting three sections of master batch, all sulfur powder, an accelerant CZ, an accelerant DZ, diphenylguanidine and an anti-scorching agent CTP into a GK255 internal mixer for mixing, wherein the rotor speed is 18rmb, the first step is carried out for 35s, and the bolt is extracted for 7 s; pressing the bolt for 30s again, and lifting the bolt for 7 s; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 107 ℃, and removing the rubber to obtain the low-heat-generation puncture-resistant base rubber composition;
and a fifth stop, stopping the low-heat-generation puncture-resistant base rubber composition to room temperature.
Wherein, in the embodiment 1, 11 parts by weight of white carbon black is added in the first mixing in the step (2); example 2 adding 8 parts by weight of white carbon black into the first-stage mixing in the step (2); example 35 parts by weight of white carbon black were added during the first mixing in step (2).
The preparation method of comparative example 1 was the same as that of examples 1 to 3 except that the raw materials were different.
The rubber composition of comparative example 1 and the rubber compositions of examples 1 to 3 were vulcanized at 140 ℃ for 60min and 90min, respectively, to obtain vulcanized samples, and the vulcanized samples were verified by physical and mechanical properties, indoor TKPH value test, and field property test.
The physical and mechanical property test data for the cured samples of comparative example 1 and examples 1-3 are shown in Table 2:
TABLE 2
As is clear from the test results in Table 1, the base rubber compositions of examples 1 to 3 exhibited a reduction in the heat generation under compression of 15% or more, a reduction in the tan at 60 ℃ of 20% or more, an improvement in the tensile strength of 4% or more, and an improvement in the tear strength of 15% or more, as compared with the base rubber composition of comparative example 1. Meanwhile, the 100% stress at definite elongation of the embodiments 1-3 is lower than that of the comparative example 1, so that the difference of the definite elongation of the tread rubber and the base rubber is reduced, the problems that the heat generation between the two rubber interfaces is large and the heat generation of the tire is large when the tire is used due to large difference of the definite elongation of the tread and the base rubber and large relative deformation between the two rubbers under the same force are solved, the definite elongation of the base rubber is properly reduced, the base rubber is better matched with the definite elongation of the tread, and the heat generation in practical use is reduced.
The tire of 27.00R49 size produced from the base rubber composition of example 1, example 3, and comparative example 1 was used for indoor TKPH testing and the tire was produced from Australian iron ore for field testing, the mine 27.00R49 size vehicle haul route was 11.3-13.5km per pass, the test tire produced from the rubber composition of example 1, example 3 and comparative example 1 was used for the same test environment and test conditions, and the road test results are shown in Table 3:
TABLE 3
Compared with the test tire produced by the rubber composition of the comparative example 1, the test tires produced by the rubber compositions of the examples 1 and 3 have no crown removal failure caused by heat generation, the puncture failure rate is reduced, the average residual pattern is shallow when the tire fails, and the average service life is improved by more than 40%.
In conclusion, the low-heat-generation puncture-resistant engineering radial tire base rubber composition is used for an engineering radial tire base, and can meet the use scenes of long distance, high speed, high TKPH value requirement and certain puncture resistance.
The formulations of the rubber compositions for tires of examples 4 to 6 are shown in Table 4, wherein the content of each component in Table 4 is in parts by weight:
TABLE 4
The method of preparing the base rubber composition of example 4 includes the steps of:
(1) preliminary mixing
Putting all natural rubber and 12 parts by weight of white carbon black into a mixing chamber of a GK255 internal mixer, and extracting the rubber for 5s when the rotating speed of a rotor is 26rmb and the temperature of the rubber reaches 95-97 ℃; pressing the bolt again, and lifting the bolt for 5s when the temperature reaches 130-132 ℃; third time of plug pressing, mixing until the temperature of the rubber material reaches 160-162 ℃ and rubber discharging is carried out, thus obtaining natural rubber/white carbon black pre-mixed masterbatch;
placing the pre-mixed masterbatch in air for cooling for 9-10h to room temperature after the first standing;
(2) one-stage mixing
Putting all the pre-mixed masterbatch, special carbon black Bester B L360, zinc oxide, stearic acid, protective wax, an anti-aging agent 4020 and 11 parts by weight of white carbon black into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotor speed is 35rmb, the plug is lifted for 8s when the temperature of the rubber material reaches 90-92 ℃, the plug is pressed again when the temperature reaches 130-132 ℃, the plug is lifted for 8s when the temperature reaches 132 ℃, the plug is pressed for the third time, and the rubber is discharged when the temperature of the rubber material reaches 160 ℃ in the mixing process to obtain a section of masterbatch;
placing the first section of masterbatch in air for cooling for 7-8 h;
(3) two stage mixing
Putting the cooled primary rubber, the rest white carbon black and all the silane coupling agents into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotating speed of a rotor is 35rmb, and the mixing time is 8s when the temperature of the rubber material reaches 93-95 ℃; pressing the bolt again, and lifting the bolt for 8s when the temperature reaches 125-; third-time bolt pressing, and rubber discharging when the temperature of the rubber material reaches 155 ℃ after mixing to obtain second-section master batch;
placing the second-stage masterbatch in air for cooling for 8-9h after the third standing;
(4) three stage mixing
Putting the cooled two-section master batch into a GK400 internal mixer for mixing, wherein the rotor speed is 31rmb, and the bolt is extracted for 8s when the temperature of the rubber reaches 90-92 ℃; pressing the bolt again, reducing the rotating speed of the rotor to 28rmb, and lifting the bolt for 8s when the temperature reaches 125-; third-time bolt pressing, namely, rubber is discharged when the temperature of the rubber material reaches 152 ℃ after mixing, so that three sections of master batch are obtained;
placing the third section of master batch in air for cooling for 6-7h to room temperature;
(5) final refining
Three sections of master batch, all sulfur powder, an accelerant CZ, an accelerant DZ, diphenylguanidine and an anti-scorching agent CTP are put into a GK255 internal mixer for mixing, the rotating speed of a rotor is 21rmb, the first step is carried out for pressing and bolting for 30s, and the bolt is lifted for 8 s; pressing the bolt for 35s again, and lifting the bolt for 8 s; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 100 ℃, and removing the rubber to obtain the low-heat-generation puncture-resistant base rubber composition;
and a fifth stop, stopping the low-heat-generation puncture-resistant base rubber composition to room temperature.
The method of preparing the base rubber composition of example 5 includes the steps of:
(1) preliminary mixing
Putting all natural rubber and 12 parts by weight of white carbon black into a mixing chamber of a GK255 internal mixer, and extracting the rubber for 5s when the rotating speed of a rotor is 26rmb and the temperature of the rubber reaches 95-97 ℃; pressing the bolt again, and lifting the bolt for 5s when the temperature reaches 130-132 ℃; third time of plug pressing, mixing until the temperature of the rubber material reaches 160-162 ℃ and rubber discharging is carried out, thus obtaining natural rubber/white carbon black pre-mixed masterbatch;
placing the pre-mixed masterbatch in air for cooling for 9-10h to room temperature after the first standing;
(2) one-stage mixing
Putting all the pre-mixed masterbatch, special carbon black Bester B L360, zinc oxide, stearic acid, protective wax, an anti-aging agent 4020 and 8 parts by weight of white carbon black into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotor speed is 36rmb, the plug is lifted for 5s when the temperature of the rubber material reaches 95-97 ℃, the plug is pressed again when the temperature reaches 132-134 ℃, the plug is lifted for 5s when the temperature reaches 163 ℃, and the plug is pressed for the third time, and the rubber is discharged when the temperature of the rubber material reaches 163 ℃ in the mixing process to obtain a section of masterbatch;
placing the first section of the master batch in air for cooling for 6-7 hours;
(3) two stage mixing
Putting the cooled primary rubber, the rest white carbon black and all the silane coupling agents into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotating speed of a rotor is 33rmb, and the mixing time is 5s when the temperature of the rubber material reaches 91-93 ℃; pressing the bolt again, and lifting the bolt for 5s when the temperature reaches 127-129 ℃; third-time bolt pressing, and rubber discharging when the temperature of the rubber material reaches 158 ℃ after mixing to obtain second-section master batch;
placing the second-stage masterbatch in air for cooling for 9-10h after the third standing;
(4) three stage mixing
Putting the cooled two-section master batch into a GK400 internal mixer for mixing, wherein the rotor speed is 30rmb, and the bolt is extracted for 5s when the temperature of the rubber reaches 93-95 ℃; pressing the bolt again, reducing the rotating speed of the rotor to 25rmb, and lifting the bolt for 5s when the temperature reaches 128-; third-time bolt pressing, namely, rubber is discharged when the temperature of the rubber material reaches 155 ℃ after mixing, and three sections of master batch are obtained;
placing the third section of master batch in air for cooling for 7-8h to room temperature;
(5) final refining
Putting three sections of master batch, all sulfur powder, an accelerant CZ, an accelerant DZ, diphenylguanidine and an anti-scorching agent CTP into a GK255 internal mixer for mixing, wherein the rotating speed of a rotor is 20rmb, the first step is carried out for pressing bolt for 33s, and the bolt is lifted for 5 s; pressing the bolt for 25s again, and lifting the bolt for 5 s; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 105 ℃, and removing the rubber to obtain the low-heat-generation puncture-resistant base rubber composition;
and a fifth stop, stopping the low-heat-generation puncture-resistant base rubber composition to room temperature.
The method of preparing the base rubber composition of example 6 includes the steps of:
(1) preliminary mixing
Putting all natural rubber and 12 parts by weight of white carbon black into a mixing chamber of a GK255 internal mixer, and extracting the rubber for 5s when the rotating speed of a rotor is 26rmb and the temperature of the rubber reaches 95-97 ℃; pressing the bolt again, and lifting the bolt for 5s when the temperature reaches 130-132 ℃; third time of plug pressing, mixing until the temperature of the rubber material reaches 160-162 ℃ and rubber discharging is carried out, thus obtaining natural rubber/white carbon black pre-mixed masterbatch;
placing the pre-mixed masterbatch in air for cooling for 9-10h to room temperature after the first standing;
(2) one-stage mixing
Putting all the pre-mixed master batch, special carbon black Bester B L360, zinc oxide, stearic acid, protective wax, an anti-aging agent 4020 and 5 parts by weight of white carbon black into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotor speed is 37rmb, the plug is lifted for 6s when the temperature of the rubber material reaches 96-98 ℃, the plug is pressed again when the temperature reaches 131-133 ℃, the plug is lifted for 6s when the temperature reaches the third time, and the third time of plug pressing is carried out, and the rubber is discharged when the temperature of the rubber material reaches 162 ℃ in the mixing process to obtain a section of master batch;
placing the first section of the master batch in air for cooling for 6-7 hours;
(3) two stage mixing
Putting the cooled primary rubber, the rest white carbon black and all the silane coupling agents into a mixing chamber of a GK400 internal mixer for mixing, wherein the rotating speed of a rotor is 34rmb, and the mixing material is extracted for 6s when the temperature of the rubber material reaches 92-94 ℃; pressing the bolt again, and lifting the bolt for 6s when the temperature reaches 128-130 ℃; third-time bolt pressing, and rubber discharging when the temperature of the rubber material reaches 155 ℃ after mixing to obtain second-section master batch;
placing the second-stage masterbatch in air for cooling for 8-9h after the third standing;
(4) three stage mixing
Putting the cooled two-section master batch into a GK400 internal mixer for mixing, wherein the rotor rotation speed is 29rmb, and the bolt is extracted for 6s when the temperature of the rubber material reaches 92-94 ℃; pressing the bolt again, reducing the rotating speed of the rotor to 26rmb, and lifting the bolt for 6s when the temperature reaches 127-129 ℃; third-time bolt pressing, namely, mixing until the temperature of the rubber material reaches 157 ℃, and removing rubber to obtain three sections of master batch;
placing the third section of master batch in air for cooling for 6-7h to room temperature;
(5) final refining
Three sections of master batch, all sulfur powder, an accelerant CZ, an accelerant DZ, diphenylguanidine and an anti-scorching agent CTP are put into a GK255 internal mixer for mixing, the rotating speed of a rotor is 10rmb, the first step is carried out for 32s, and the bolt is extracted for 6 s; pressing the bolt 27s again, and lifting the bolt 6 s; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 103 ℃, and removing the rubber to obtain the low-heat-generation puncture-resistant base rubber composition;
and a fifth stop, stopping the low-heat-generation puncture-resistant base rubber composition to room temperature.
Claims (9)
1. The low-heat-generation puncture-resistant engineering radial tire base rubber composition is characterized by comprising the following raw materials in parts by weight:
2. the low heat build puncture resistant engineered radial tire base rubber composition of claim 1, wherein said specialty carbon black comprises a Bester B L360 specialty carbon black.
3. The low heat build puncture resistant engineered radial tire base rubber composition of claim 1, wherein said silane coupling agent has the structure of
4. The low heat build puncture resistant engineered radial tire base rubber composition of claim 1, wherein the protective wax is a mixture of microcrystalline wax and paraffin wax in a mass ratio of 2: 1.
5. The low heat build puncture resistant engineered radial tire base rubber composition of claim 1, wherein said vulcanization accelerator comprises 0.6 to 0.9 parts of accelerator CZ and 0.5 to 0.8 parts of accelerator DZ.
6. The low heat build puncture resistant engineered radial tire base rubber composition of claim 1, wherein said silane activator is accelerator DPG.
7. The low heat build puncture resistant engineered radial tire base rubber composition of claim 1, wherein said scorch retarder is a scorch retarder CTP.
8. The method for producing a low-heat build-up puncture resistant engineered radial tire base rubber composition according to claim 1, comprising the steps of:
(1) preliminary mixing
Putting 100 parts by weight of natural rubber and 12 parts by weight of white carbon black into a mixing chamber of an internal mixer, extracting the mixture for 5s when the rotating speed of a rotor is 25-26rmb and the temperature of the rubber reaches 95-97 ℃; pressing the bolt again, and lifting the bolt for 5s when the temperature reaches 130-132 ℃; third time of plug pressing, mixing until the temperature of the rubber material reaches 160-162 ℃ and rubber discharging is carried out, thus obtaining natural rubber/white carbon black pre-mixed masterbatch;
first parking: the pre-mixed masterbatch is placed in the air and cooled to the room temperature;
(2) one-stage mixing
Putting premixed master batch, 5-11 parts of white carbon black, 18-25 parts of special carbon black, 3-5 parts of zinc oxide, 2-4 parts of stearic acid, 1-2 parts of protective wax and 3-5 parts of anti-aging agent 4020 into a mixing chamber of an internal mixer for mixing, wherein the rotating speed of a rotor is 33-37rmb, and the rubber material is extracted for 5-8s when the temperature reaches 90-100 ℃; pressing the bolt again, and lifting the bolt for 5-8s when the temperature reaches 130-135 ℃; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 160-165 ℃ and discharging the rubber to obtain a section of masterbatch;
placing the first section of the master batch in air for cooling for 6-8 hours;
(3) two stage mixing
Putting the cooled primary rubber, 8-10 parts of white carbon black and 3-6 parts of silane coupling agent into a mixing chamber of an internal mixer for mixing, wherein the rotor speed is 32-35rmb, and the bolt is lifted for 5-8s when the temperature of the rubber material reaches 90-95 ℃; pressing the bolt again, and lifting the bolt for 5-8s when the temperature reaches 125-130 ℃; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 155-160 ℃, and discharging the rubber to obtain two-section masterbatch;
placing the second-stage masterbatch in air for cooling for 8-10h after the third standing;
(4) three stage mixing
Putting the cooled three-section master batch into an internal mixer for mixing, wherein the rotating speed of a rotor is 28-31rmb, and the bolt is extracted for 5-8s when the temperature of the rubber material reaches 90-95 ℃; pressing the bolt again, reducing the rotating speed of the rotor to 24-28rmb, and lifting the bolt for 5-8s when the temperature reaches 125-130 ℃; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 152-157 ℃, and discharging the rubber to obtain three-section master rubber;
placing the third section of master batch in air for cooling for 6-8h to room temperature;
(5) final refining
Putting the three-section master batch, 1-1.7 parts by weight of sulfur powder, 1.1-1.7 parts by weight of vulcanization accelerator, 0.15-0.3 part by weight of silane activator and 0.1-0.3 part by weight of scorch retarder into an internal mixer for mixing, wherein the rotating speed of a rotor is 18-21rmb, the first step of bolt pressing is carried out for 30-35s, and the bolt extraction is carried out for 5-8 s; pressing the bolt for 25-35s again, and extracting the bolt for 5-8 s; third-time bolt pressing, namely mixing until the temperature of the rubber material reaches 100-107 ℃ and discharging the rubber to obtain the low-heat-generation puncture-resistant tire base rubber composition;
and a fifth stop, stopping the low-heat-generation puncture-resistant base rubber composition to room temperature.
9. The method for preparing a low-heat-generation puncture-resistant engineering radial tire base rubber composition according to claim 8, wherein the special carbon black is a special carbon black Bester B L360, the protective wax is a mixture of microcrystalline wax and paraffin wax in a mass ratio of 2:1, the vulcanization accelerator comprises 0.6-0.9 part of accelerator CZ and 0.5-0.8 part of accelerator DZ, the silane activator is accelerator DPG, the scorch retarder is a scorch retarder CTP, and the silane coupling agent has a structure of
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115594897A (en) * | 2022-11-08 | 2023-01-13 | 赛轮集团股份有限公司（Cn） | Tread rubber composition, tread rubber and preparation method |
| WO2023008336A1 (en) * | 2021-07-27 | 2023-02-02 | 株式会社大阪ソーダ | Rubber composition and use of rubber composition |
| CN116120643A (en) * | 2022-12-30 | 2023-05-16 | 中策橡胶(天津)有限公司 | Puncture-resistant low-split underground engineering tire sidewall composition and preparation method thereof |
-
2020
- 2020-04-09 CN CN202010273700.3A patent/CN111499933A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023008336A1 (en) * | 2021-07-27 | 2023-02-02 | 株式会社大阪ソーダ | Rubber composition and use of rubber composition |
| CN115594897A (en) * | 2022-11-08 | 2023-01-13 | 赛轮集团股份有限公司（Cn） | Tread rubber composition, tread rubber and preparation method |
| CN116120643A (en) * | 2022-12-30 | 2023-05-16 | 中策橡胶(天津)有限公司 | Puncture-resistant low-split underground engineering tire sidewall composition and preparation method thereof |
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Application publication date: 20200807 |