CN115850828A - High-speed tire Tread rubber and preparation method thereof - Google Patents
High-speed tire Tread rubber and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to in the field of rubber, the rubber is prepared by mixing rubber, in particular to tread rubber for high-speed tires and a preparation method thereof. In particular, the present invention relates to a composition for preparing rubber and a method for preparing rubber. The rubber obtained by the invention has high strength, good processing performance, good wear resistance, low heat generation and excellent high-speed performance, and is particularly suitable for being used as tread rubber for high-speed tires. In addition, compared with the prior art, the preparation method of the rubber can reduce energy consumption and pollution and can generate great economic and social benefits.
Description
Technical Field
The invention belongs to the field of rubber, and particularly relates to a composition for preparing rubber and a method for preparing rubber. The invention also relates to rubber prepared from the composition or the method.
Background
In recent years, with the development of economy in China, the industries of automobiles, engineering machinery and expressways are also rapidly developed, and the running speed of automobiles or mobile engineering machinery is higher and higher. Meanwhile, the protection consciousness of human beings on the self life safety and living environment is further enhanced. Therefore, there is a strong demand for a tire with high performance, that is, a tire having a safe, durable, and environmentally friendly function, and a high-speed performance. According to the running characteristics of a high-speed tire, the tread rubber is required to maintain the rigidity of the tire tread, reduce the overall heat generation of the tire tread and avoid the delamination of the tire tread caused by the overhigh speed of the tire.
At present, domestic researches on high strength and low heat generation of high-speed tire rubber are mainly realized by a process of modifying an inorganic filler by using a silane coupling agent and compounding the inorganic filler with the rubber. The use of submicron inorganic heat-conducting filler and carbon nanotube bundles is reported, but the method has limited heat generation reduction of rubber, and the cost is increased greatly, which is not favorable for rubber application and cost control. Meanwhile, in the modification process, a large amount of ethanol is generated in the hydrolysis process of the silane coupling agent, and the ethanol is extremely volatile at high temperature, so that a large amount of ethanol steam is generated in the application process of the process and is discharged into a production environment. The method not only can bring adverse effects to the health of equipment operators, but also can cause potential safety hazards to the operation of processing equipment due to the characteristics of flammability and explosiveness of ethanol. Ethanol, a small-molecule volatile organic compound, is a typical VOC emission, and nowadays, the pollution caused by VOC emission is more and more emphasized in various countries. Therefore, the process of modifying the inorganic filler by using the silane coupling agent and compounding the inorganic filler with the rubber is a process means with high energy consumption and high pollution, and the process has obvious environmental risk in future application.
Disclosure of Invention
The invention aims to provide a high-speed tire tread rubber with excellent performance, and a process means for avoiding high energy consumption and high pollution is provided.
The invention uses a low-cost, green and environment-friendly natural phenol compound, namely cardanol, to emulsify into emulsion by mixing an emulsifier AES, and directly adds the emulsion into natural latex for modification. In the high-temperature drying process, cardanol can react with a natural rubber molecular chain, so that the crosslinking density is improved, and a rigid group benzene ring can be introduced to achieve the purpose of improving the mechanical strength of the natural rubber. The self-made low-heat-generation elastomer can effectively enhance the strength and reduce heat generation, and in addition, a vulcanizing agent, an anti-scorching agent, an accelerator, an anti-aging agent and the like are added for modification, so that the high strength, the good processing performance and the good wear resistance of the tire rubber can be ensured, and the low heat generation and the superior high-speed performance can also be ensured. The invention does not use silane coupling agent, avoids environmental risk, has low price and easy obtainment of materials required by preparation and simple preparation process. Further, the rubber vulcanization process is optimized, and the high-speed performance of the tread rubber is further improved.
In one aspect, the present application provides a composition for preparing rubber comprising, by weight: 100 parts of natural rubber, 0.5-1 part (e.g., 0.5, 0.6, 0.7, 0.8, 0.9 or 1 part) of cardanol, 5-10 parts (e.g., 5, 6, 7, 8, 9 or 10 parts) of AES (emulsifier), 6-13 parts (e.g., 6, 7, 8, 9, 10, 11, 12 or 13 parts) of self-made low heat-generating elastomer, 0.5-1 part (e.g., 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0 part) of formaldehyde resin CF, 18-25 parts (e.g., 18, 19, 20, 21, 22, 23, 24 or 25 parts) of carbon black, 6-9 parts (e.g., 6, 7, 8 or 9 parts) of white carbon black, 1-2 parts (e.1, 1.5 or 2 parts) of high temperature wax, 1-2 parts (e.g., 1, 1.5 or 2 parts) of anti-aging agent, 1-2 parts (e.1, 1.5 or 2 parts) of insoluble sulfur-20.5-2 parts (e.g., 1.5, 2 parts of OT) (e.5, 1.5, 2 parts of zinc oxide), or 2 parts of (e.5) of accelerator, 3 parts of stearic acid, 4 parts of zinc oxide, 4 parts of (e.5 or 2) or 2 parts of zinc oxide, 4 parts of formaldehyde resin;
the low heat-generating elastomer is Ethylene Propylene Diene Monomer (EPDM) grafted Maleic Anhydride (MAH) and styrene-butadiene-styrene block copolymer (SBS) and nano B 4 A blend of C;
the low heat generation elastomer is prepared by a preparation method comprising the following steps:
(1) Weighing 80-100 parts (such as 80, 85, 90, 95 or100 parts) EPDM-g-MAH (preferably Dow DM-7, maleic anhydride grafting 0.7% -1.18% (e.g., 0.7%, 0.8%, 0.9%, 1.0%, 1.1% or 1.18%)), 80-100 parts (e.g., 80, 85, 90, 95 or 100 parts) SBS elastomer, 10-20 parts (e.g., 10, 15 or 20 parts) nano-B 4 C, standby;
(2) Setting the temperature of the torque rheometer at 120-130 deg.C and the rotor speed at 50-70 rpm (such as 50rpm, 60rpm or 70 rpm), sequentially adding SBS and nanometer B 4 C and EPDM-g-MAH, mixing for 15-20 min, and taking out;
the carbon black is selected from N326, N660, or a combination thereof;
the anti-aging agent is selected from RD, 4020, 4030, DFC-34 or any combination thereof;
the accelerator is selected from DPG, carbowax, NS or any combination thereof.
The cardanol used in the invention is extracted from cashew nut shell oil and has unsaturated or saturated long carbon chain (-C) 15 H 27-31 ) The unsaturated or saturated long carbon chain is meta to the hydroxyl group. The cardanol can react with a natural rubber molecular chain, so that the crosslinking density is improved, and a rigid group benzene ring can be introduced to achieve the purpose of improving the mechanical strength of the natural rubber.
The emulsifier AES used in the invention is an anionic surfactant with excellent performance, and the main components are sodium dodecyl sulfate and sodium laureth sulfate.
The formaldehyde resin CF used in the present invention refers to cresol-formaldehyde resin.
Herein, N326 and N660 are carbon black grades, RD, 4020, 4030 and DFC-34 are anti-aging agent grades, DPG, carbowax and NS are accelerator grades, and HDOT-20 is a grade of insoluble sulfur. The reagents are all conventional products which can be obtained commercially, and the names and CAS numbers of some reagents are as follows:
in one aspect, the present application provides a process for preparing rubber comprising starting with a composition of the present invention; the method comprises the following steps:
the method comprises the following steps: using cardanol to modify natural rubber to serve as raw rubber;
step two: self-made low-heat-generation elastomer;
step three: mixing the raw rubber obtained in the step one with the low-heat-generation elastomer obtained in the step two, carbon black, white carbon black, high-temperature wax, zinc oxide and formaldehyde resin CF to obtain primary rubber compound;
step four: mixing the primary rubber compound with insoluble sulfur HDOT-20, an accelerant and an anti-coking agent to obtain a secondary rubber compound; conveying the secondary rubber compound to an open mill for thin passing;
step five: vulcanizing the secondary rubber compound under the heating condition to obtain vulcanized rubber;
the step one and the step two can be carried out sequentially or simultaneously.
In certain embodiments, the first step comprises:
step 1-1:
dissolving the cardanol and an emulsifier AES in water to prepare an aqueous solution containing 8% -10% (such as 8%, 9% or 10%) of cardanol, and emulsifying to obtain a cardanol emulsion; preparing natural rubber into natural latex with solid content of 30-40% (such as 30%, 32%, 34%, 36%, 38% or 40%), and slowly adding the cardanol emulsion into the stirred natural rubber for modification reaction; preferably, the stirring speed is 300-400 r/min; preferably, the time of the modification reaction is 60-120 min;
step 1-2: after the reaction is finished, performing flocculation curing on the rubber by using formic acid aqueous solution; preferably, the concentration of the formic acid aqueous solution is 5% -6%; preferably, the flocculation curing time is 1-2 h; crushing the flocculated and solidified rubber into rubber particles by pressing and shearing, and soaking the rubber particles in deionized waterTo remove formic acid; in certain embodiments, this step is: placing the modified natural rubber into a tray, and performing flocculation curing by using 5-6% formic acid water solution; standing for 1 hr, pressing, and cutting into (15 × 10 × 10) mm 3 Soaking the rubber particles in deionized water for 24 hours to remove formic acid;
step 1-3: subjecting the rubber particles to a high temperature treatment at 104 to 106 ℃ (e.g. 105 ℃), preferably for 1 to 2 hours, preferably in a forced air drying oven; the rubber particles are then sheeted on a two-roll mill at 1-3 mm (e.g., 2 mm) and dried to constant weight (e.g., 2 hours) to give a green rubber.
In certain embodiments, step two comprises:
step 2-1: weighing 80-100 parts of EPDM-g-MAH (preferably Dow DM-7, the grafting rate of maleic anhydride is 0.7-1.18 percent), 80-100 parts of SBS elastomer and 10-20 parts of nano B 4 C, standby;
step 2-2: setting the temperature of the torque rheometer at 120-130 deg.c and the rotor speed at 50-70 rpm, and adding SBS and nanometer B successively 4 C and EPDM-g-MAH, mixing for 15-20 min, and taking out.
In certain embodiments, step three comprises:
step 3-1: weighing the raw rubber obtained in the step one and the low-heat-generation elastomer, the carbon black, the white carbon black and the high-temperature wax obtained in the step two according to the formula ratio, adding the raw rubber, the low-heat-generation elastomer, the carbon black, the white carbon black and the high-temperature wax into an internal mixer for mixing, wherein the rotor speed is 55-60 r/min, and entering the next step when the temperature is increased to 134-136 ℃ (such as 135 ℃);
step 3-2: adding zinc oxide and formaldehyde resin, continuously mixing at a rotor speed of 55-60 r/min, and entering the next step when the temperature is raised to 144-146 ℃ (for example, 145 ℃);
step 3-3: the top bolt is pushed to the middle position for 5 to 6 seconds, and the speed of the rotor is adjusted to 45 to 50r/min; and lifting the top plug to the highest position, keeping the speed of a rotor at 45-50 r/min, and discharging the rubber when the temperature is raised to 154-156 ℃ (for example 155 ℃), thereby obtaining primary rubber compound.
In certain embodiments, the fourth step comprises:
step 4-1: adding the primary rubber compound, wherein the rotor speed is 25-30 r/min, and the mixing time is 28-32 s (for example, 30 s); adding insoluble sulfur HDOT-20, an accelerant and a scorch retarder, keeping the rotor speed at 25-30 r/min, and entering the next step when the temperature rises to 89-91 ℃ (for example, 90 ℃);
step 4-2: lifting the top bolt to a middle position, keeping the rotor speed at 25-30 r/min, and discharging rubber when the temperature is raised to 102-104 ℃ (for example, 103 ℃), thereby obtaining secondary rubber compound;
step 4-3: and (3) conveying the secondary rubber compound to an open mill for three times after rubber discharge of the internal mixer, wherein the thickness of the lower sheet is 2-3 mm.
In certain embodiments, in step five, the vulcanization temperature is 137 to 139 ℃ (e.g., 138 ℃) and the vulcanization time is 35 to 40min.
In one aspect, the present application provides a rubber obtained from the composition or the method of making of any of the above.
The invention adopts the cheap, green and environment-friendly natural phenol compound, namely cardanol, and a vulcanizing agent, an anti-scorching agent, an accelerant, an anti-aging agent, a self-made low-heat-generation elastomer and the like to modify natural rubber. The tread rubber for the high-speed tire, which can ensure high strength, good processing performance and good wear resistance of the tire rubber and also can ensure low heat generation and excellent high-speed performance, is prepared by preparing ingredients, plasticating, mixing and extruding. The materials needed by the preparation are low in price and easy to obtain, and the preparation process is simple.
In certain embodiments, the rubbers of the present invention have one or more of the following characteristics:
(1) Tensile strength: 29 to 35MPa (for example) 30 to 34 MPa);
(2) Elongation at break: 540% -570% (e.g. 550% -557%);
(3) 300% stress at definite elongation: 21 to 23MPa;
(4) Tan δ (dielectric loss angle) at 60 ℃:0.07 to 0.09;
(5) Akron abrasion volume (cm) 3 ): 0.19 to 0.25 (e.g., 0.20 to 0.23).
The above parameters can be determined by methods conventional in the art, for example, as described in GB/T528-2009 or GB/T1689-2015.
In one aspect, the present application provides the use of the rubber of the present invention for the preparation of a tire. In certain embodiments, the rubber is used in a tread rubber for a tire.
In one aspect, the present application provides a product comprising, or made from, a rubber of the present invention. In certain embodiments, the product is selected from the group consisting of a tire, a rubber track, a conveyor belt, a shock absorber.
The application also provides a vehicle or a construction machine, which comprises the tire.
Advantageous effects of the invention
The tread rubber for the high-speed tire provided by the invention has the following advantages:
(1) The high-strength natural rubber is obtained by using cardanol modified natural rubber in the raw rubber system, and the high-wear-resistance carbon black/white carbon black combined system is used in the reinforcing system, so that the tan delta of the rubber material at 60 ℃ is reduced and the heat generation is reduced on the basis of ensuring the tensile property of the rubber material;
(2) The self-made low-heat-generation elastomer is added, so that the heat generation performance of the rubber material can be further improved, and the strength and the wear resistance of the rubber material are improved;
(3) The stretching stress and the tensile property of the vulcanized rubber meet the requirement of rigidity matching of the tire tread of the high-speed engineering machinery tire, and the heat generation property and the wear resistance can adapt to the running characteristics of the high-speed engineering machinery tire.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
A rubber for high-speed tires, characterized by: 100 parts of natural rubber NR, 0.5 part of cardanol, 5 parts of emulsifier AES, 8 parts of self-made low-heat-generation elastomer, 0.5 part of formaldehyde resin CF, 25 parts of carbon black N326, 9 parts of white carbon black, 2 parts of high-temperature wax, 0 part of anti-aging agent 4022 parts, 2 parts of insoluble sulfur HDOT-20 parts, 2 parts of accelerator DPG, 3 parts of zinc oxide and 3 parts of stearic acid.
The specific implementation mode of the tread rubber for the high-speed tire comprises the following steps:
the method comprises the following steps:
weighing a certain amount of cardanol according to a formula, and an emulsifier AES, dissolving in water to prepare a water solution containing 10% of cardanol, then adding into an emulsifying machine, mixing and emulsifying, and obtaining the cardanol emulsion after 10 min. Preparing natural rubber into natural latex with the solid content of 30%, and stirring in a stirring kettle at the rotating speed of 300r/min. Slowly adding the prepared cardanol emulsion into the natural rubber stirred at a high speed, and then carrying out modification reaction for 60min. After the reaction is finished, the modified natural rubber is placed in a tray, and flocculation curing is carried out by using 5% formic acid aqueous solution. Standing for 1 hr, pressing, and cutting into (15 × 10 × 10) mm 3 The rubber particles of (2) are soaked in deionized water for 24 hours to remove formic acid. And (3) carrying out high-temperature treatment at 105 ℃ for 2h in a blast drying oven, then slicing the rubber particles on a two-roll open mill by 2mm, and drying for 2h to constant weight to obtain the crude rubber.
Step two:
weighing 100 parts of EPDM-g-MAH sample (Dow DM-7, maleic anhydride grafting rate of 0.7-1.18 percent), 100 parts of SBS elastomer and 15 parts of nano B 4 C, setting the temperature of the torque rheometer to be 120 ℃, setting the rotating speed of a rotor to be 60rpm, and sequentially adding SBS and nanometer B 4 C and EPDM-g-MAH, mixing for 20min, and taking out.
Step three:
weighing the raw rubber obtained in the first step and the self-made low-heat-generation elastomer, the carbon black, the white carbon black and the high-temperature wax obtained in the second step according to the formula ratio, adding the raw rubber, the self-made low-heat-generation elastomer, the carbon black, the white carbon black and the high-temperature wax into an internal mixer for mixing, wherein the rotor speed is 60r/min, and heating to 135 ℃ after the temperature is raised. Adding zinc oxide and formaldehyde resin, continuously mixing at a rotor speed of 60r/min, and heating to 145 ℃. Lifting the top bolt to the middle position for 5s, and adjusting the speed of the rotor to 50r/min; and lifting the top plug to the highest position, keeping the speed of a rotor at 50r/min, and discharging rubber when the temperature is raised to 155 ℃ to obtain primary rubber compound.
Step four:
adding the mixed rubber in the third step, wherein the rotor speed is 30r/min, and the mixing time is 30s; adding sulfur, an accelerator NS and a scorch retarder, wherein the rotor speed is 30r/min, and entering the next step when the temperature is raised to 90 ℃; and (4) plugging the top to a middle position, keeping the speed of a rotor at 30r/min, and discharging rubber when the temperature is raised to 103 ℃ to obtain secondary rubber compound. And (3) conveying the secondary rubber compound to an open mill for three times after rubber discharge of the internal mixer, wherein the thickness of the lower sheet is 3mm.
Step five:
and vulcanizing the secondary rubber compound at high temperature to prepare vulcanized rubber, wherein the vulcanization temperature is 138 ℃, and the vulcanization time is 40min.
Example 2
A rubber for high-speed tires, characterized by: 100 parts of natural rubber NR, 1 part of cardanol, 10 parts of emulsifier AES, 10 parts of self-made low-heat-generation elastomer, 1 part of formaldehyde resin CF, 25 parts of carbon black N660, 9 parts of white carbon black, 2 parts of high-temperature wax, 4030 part of anti-aging agent, 2 parts of insoluble sulfur HDOT-20, 2.5 parts of accelerator NS, 3 parts of zinc oxide and 3 parts of stearic acid.
The specific implementation mode of the tread rubber of the high-speed tire is as follows:
the method comprises the following steps:
weighing a certain amount of cardanol according to a formula, and an emulsifier AES, dissolving in water to prepare a water solution containing 10% of cardanol, then adding into an emulsifying machine, mixing and emulsifying, and obtaining the cardanol emulsion after 10 min. Preparing natural rubber into natural latex with the solid content of 30%, and stirring in a stirring kettle at the rotating speed of 300r/min. Slowly adding the prepared cardanol emulsion into the natural rubber stirred at a high speed, and then carrying out modification reaction for 60min. After the reaction is finished, the modified natural rubber is placed in a tray, and flocculation curing is carried out by using 5% formic acid aqueous solution. Standing for 1 hr, pressing, and cutting into (15 × 10 × 10) mm 3 The rubber particles are soaked in deionized water for 24 hours to remove formic acid. High temperature treatment at 105 deg.C for 2 hr in a blast drying oven, slicing the rubber particles with a size of 2mm on a two-roll mill, and oven drying for 2 hr to constant weight to obtain raw rubberAnd (6) gluing.
Step two:
weighing 100 parts of EPDM-g-MAH sample (Dow DM-7, maleic anhydride grafting rate of 0.7-1.18 percent), 100 parts of SBS elastomer and 15 parts of nano B 4 C, setting the temperature of the torque rheometer to be 120 ℃, setting the rotating speed of a rotor to be 60rpm, and sequentially adding SBS and nanometer B 4 C and EPDM-g-MAH, mixing for 20min, and taking out.
Step three:
weighing the raw rubber obtained in the first step and the self-made low-heat-generation elastomer, the carbon black, the white carbon black and the high-temperature wax obtained in the second step according to the formula ratio, adding the raw rubber, the self-made low-heat-generation elastomer, the carbon black, the white carbon black and the high-temperature wax into an internal mixer for mixing, wherein the rotor speed is 60r/min, and heating to 135 ℃ after the temperature is raised. Adding zinc oxide and formaldehyde resin, continuously mixing at a rotor speed of 60r/min, and heating to 145 ℃. The top bolt is pushed to the middle position for 5s, and the speed of the rotor is adjusted to 50r/min; and lifting the top plug to the highest position, keeping the speed of a rotor at 50r/min, and discharging rubber when the temperature is raised to 155 ℃ to obtain primary rubber compound.
Step four:
adding the mixed rubber in the third step, wherein the rotor speed is 30r/min, and the mixing time is 30s; adding sulfur, an accelerator NS and a scorch retarder, wherein the rotor speed is 30r/min, and entering the next step when the temperature is raised to 90 ℃; and (4) plugging the top bolt to a middle position, keeping the speed of a rotor at 30r/min, and discharging rubber when the temperature is raised to 103 ℃ to obtain secondary rubber compound. And (3) conveying the secondary rubber compound to an open mill for three times after rubber discharge of the internal mixer, wherein the thickness of the lower sheet is 3mm.
Step five:
and vulcanizing the secondary rubber compound at high temperature for 40min to obtain vulcanized rubber, wherein the vulcanization temperature is 138 ℃.
Comparative example 1
The embodiment is prepared from the following raw materials in parts by weight: 100 parts of natural rubber, 32625 parts of carbon black, 9 parts of white carbon black, 2 parts of high-temperature wax, 3 parts of zinc oxide, 2 parts of stearic acid, 2 parts of sulfur, 1.5 parts of accelerator DPG, 0 part of anti-aging agent 4021 part and 2 parts of silane coupling agent.
Placing raw rubber into an open rubber mixing mill for plasticating for 4min, sequentially adding an anti-aging agent, zinc oxide, stearic acid, carbon black, white carbon black, high-temperature wax and a silane coupling agent after the raw rubber is coated on a roller for mixing, after powder feeding is finished, performing triangular coating for multiple times, finally adding sulfur and an accelerator, adjusting the roller spacing to be 2mm, and discharging the sheet. And placing the rubber sheet for 24 hours, putting the rubber sheet into a mold, and vulcanizing the rubber sheet in a flat vulcanizing machine at the temperature of 155 ℃ for 12min.
The performance test is carried out according to the standards of GB/T528-2009, GB/T1689-2015 and the like, and the results are shown in Table 1:
TABLE 1 results of rubber Properties measurements
| Name of item | Example 1 | Example 2 | Comparative example 1 |
| Tensile strength/MPa | 30.7 | 33.5 | 24.5 |
| Elongation at break/%) | 550.8 | 556.7 | 488.4 |
| 300% stress at definite elongation/MPa | 22.3 | 21.6 | 17.7 |
| Tan delta at 60 DEG C | 0.086 | 0.072 | 0.195 |
| Akron attrition volume (cm) 3 ) | 0.23 | 0.20 | 0.29 |
While specific embodiments of the invention have been described in detail, those skilled in the art will understand that: various modifications and changes in detail can be made in light of the overall teachings of the disclosure, and such changes are intended to be within the scope of the present invention. The full scope of the invention is given by the appended claims and any equivalents thereof.
Claims (12)
1. A composition for preparing rubber comprising, in weight ratios: 100 parts of natural rubber, 0.5-1 part of cardanol, 5-10 parts of emulsifier AES, 6-13 parts of self-made low-heat-generation elastomer, 0.5-1 part of formaldehyde resin CF, 18-25 parts of carbon black, 6-9 parts of white carbon black, 1-2 parts of high-temperature wax, 1-2 parts of anti-aging agent, 1.5-2 parts of insoluble sulfur HDOT-20, 1.5-2.5 parts of accelerator, 2-4 parts of zinc oxide and 2-3 parts of stearic acid;
the low heat-generating elastomer is Ethylene Propylene Diene Monomer (EPDM) grafted Maleic Anhydride (MAH) and styrene-butadiene-styrene block copolymer (SBS) and nano B 4 A blend of C;
the low heat generating elastomer is prepared by a preparation method comprising the following steps:
(1) Weighing 80-100 parts of EPDM-g-MAH (preferably Dow DM-7, the grafting rate of maleic anhydride is 0.7-1.18 percent), 80-100 parts of SBS elastomer and 10-20 parts of nano B 4 C, standby;
(2) Setting the temperature of the torque rheometer at 120-130 deg.c and the rotor speed at 50-70 rpm, and adding SBS and nanometerB 4 C and EPDM-g-MAH, mixing for 15-20 min, and taking out;
the carbon black is selected from N326, N660, or a combination thereof;
the anti-aging agent is selected from RD, 4020, 4030, DFC-34 or a combination thereof;
the accelerator is selected from DPG, carbowax, NS, or combinations thereof.
2. A process for preparing a rubber comprising starting with the composition of claim 1; the method comprises the following steps:
the method comprises the following steps: using cardanol to modify natural rubber to serve as raw rubber;
step two: self-made low-heat-generation elastomer;
step three: mixing the raw rubber obtained in the step one with the low-heat-generation elastomer obtained in the step two, carbon black, white carbon black, high-temperature wax, zinc oxide and formaldehyde resin CF to obtain primary rubber compound;
step four: mixing the primary rubber compound with insoluble sulfur HDOT-20, an accelerant and an anti-coking agent to obtain a secondary rubber compound; conveying the secondary rubber compound to an open mill for thin passing;
step five: vulcanizing the secondary rubber compound under the heating condition to obtain vulcanized rubber;
the step one and the step two can be carried out sequentially or simultaneously.
3. The method of claim 2, said step one comprising:
step 1-1: dissolving the cardanol and an emulsifier AES in water to prepare an aqueous solution containing 8% -10% of cardanol, and emulsifying to obtain a cardanol emulsion; preparing natural rubber into natural latex with the solid content of 30-40%, and slowly adding the cardanol emulsion into the stirred natural rubber for modification reaction; preferably, the stirring speed is 300-400 r/min; preferably, the time of the modification reaction is 60-120 min;
step 1-2: after the reaction is finished, performing flocculation curing on the rubber by using a formic acid aqueous solution; preferably, the concentration of the formic acid aqueous solution is 5 to 6 percent; preferably, the flocculation curing time is 1-2 h; pressing and shearing the rubber subjected to flocculation curing into rubber particles, and soaking the rubber particles in deionized water to remove formic acid;
step 1-3: and (3) carrying out high-temperature treatment on the rubber particles at 104-106 ℃, preferably treating for 1-2 h, then slicing the rubber particles on a two-roll open mill by 1-3 mm, and drying to constant weight to obtain raw rubber.
4. The method of claim 2 or 3, said step two comprising:
step 2-1: weighing 80-100 parts of EPDM-g-MAH sample (preferably Dow DM-7, the grafting rate of maleic anhydride is 0.7-1.18 percent), 80-100 parts of SBS elastomer and 10-20 parts of nano B 4 C, standby;
step 2-2: setting the temperature of the torque rheometer at 120-130 deg.c and the rotor speed at 50-70 rpm, and adding SBS and nanometer B successively 4 C and EPDM-g-MAH, mixing for 15-20 min, and taking out.
5. The method of any of claims 2-4, said step three comprising:
step 3-1: weighing the raw rubber obtained in the step one, the low-heat-generation elastomer obtained in the step two, carbon black, white carbon black and high-temperature wax according to the formula ratio, adding the raw rubber, the low-heat-generation elastomer, the carbon black, the white carbon black and the high-temperature wax into an internal mixer for mixing, wherein the rotor speed is 55-60 r/min, and entering the next step when the temperature is increased to 134-136 ℃;
step 3-2: adding zinc oxide and formaldehyde resin, continuously mixing at a rotor speed of 55-60 r/min, heating to 144-146 ℃, and entering the next step;
step 3-3: the top bolt is pushed to the middle position for 5 to 6 seconds, and the speed of the rotor is adjusted to 45 to 50r/min; and lifting the top plug to the highest position, keeping the rotor speed at 45-50 r/min, and discharging rubber when the temperature is raised to 154-156 ℃ to obtain the primary rubber compound.
6. The method of any of claims 2-5, said step four comprising:
step 4-1: adding the primary rubber compound, wherein the rotor speed is 25-30 r/min, and the mixing time is 28-32 s; adding insoluble sulfur HDOT-20, an accelerant and a scorch retarder, keeping the rotor speed at 25-30 r/min, and entering the next step when the temperature rises to 89-91 ℃;
step 4-2: the top bolt is inserted to the middle position, the speed of the rotor is kept at 25-30 r/min, and the rubber is discharged when the temperature is raised to 102-104 ℃, so that secondary rubber compound is obtained;
step 4-3: and (3) after the rubber of the secondary rubber compound is discharged from the internal mixer, sending the rubber to an open mill for thin passing for three times, wherein the thickness of the lower sheet is 2-3 mm.
7. The process of any of claims 2-6, wherein in step five, the vulcanization temperature is 137-139 ℃ and the vulcanization time is 35-40 min.
8. A rubber obtained from the composition of claim 1 or the process of any one of claims 2-7.
9. The rubber of claim 8 having one or more of the following characteristics:
(1) Tensile strength: 29 to 35MPa;
(2) Elongation at break: 540% -570%;
(3) 300% stress at definite elongation: 21 to 23MPa;
(4) Tan δ (dielectric loss angle) at 60 ℃:0.07 to 0.09;
(5) Akron abrasion volume (cm) 3 )：0.19～0.25。
10. Use of a rubber according to claim 8 or 9 for the preparation of a tire;
preferably, the rubber is used for a tread rubber of a tire.
11. A product comprising or made from the rubber of claim 8 or 9;
preferably, the product is selected from the group consisting of tires, rubber tracks, conveyor belts, shock absorbers.
12. A vehicle or a work machine comprising a tyre according to claim 11.
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| CN202211555763.3A CN115850828A (en) | 2022-12-06 | 2022-12-06 | High-speed tire Tread rubber and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027463A1 (en) * | 2023-07-10 | 2024-02-08 | 徐工集团工程机械股份有限公司 | Ink composition, and preparation method and use thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027463A1 (en) * | 2023-07-10 | 2024-02-08 | 徐工集团工程机械股份有限公司 | Ink composition, and preparation method and use thereof |
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