CN115895057A - Anti-aging and anti-flexing tire side rubber and preparation method thereof - Google Patents
Anti-aging and anti-flexing tire side rubber and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the field of rubber, and particularly relates to an anti-aging and anti-flexing tire side rubber 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 can not only ensure the anti-aging performance of the side rubber of the tire, but also ensure the flex crack resistance of the side rubber of the tire, has good fatigue resistance, low price and easy obtainment of materials required by preparation, simple preparation process, outstanding flex crack resistance and excellent anti-aging performance.
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
Because the sidewall is always in cyclic reciprocating compression deformation in the driving process of an automobile, ozone and ultraviolet rays react with the sidewall to continuously damage the sidewall and simultaneously receive the action of external mechanical force, the sidewall rubber material is generally required to have excellent aging resistance, abrasion resistance, tear resistance, radial and circumferential cracking resistance and good fatigue life. In addition, the performance of the tire sidewall, which is the portion of the tire that undergoes extremely frequent flex deformation, should have excellent flex crack resistance, is also important from the aspect of appearance and durability.
Most of the conventional tire side rubber systems are pure Natural Rubber (NR) or natural rubber/butadiene rubber (NR/BR) combined systems, wherein NR has excellent flex-crack resistance and BR has excellent flex-crack resistance initiation performance, but the combined systems have the defects of poor flex-crack resistance, poor thermal oxygen aging resistance and the like. Compared with other parts of the tire, the tire side wall is more easily subjected to solar irradiation, thermal oxygen and ozone to generate aging cracks, so that the tire side wall has higher requirements on aging resistance, and meanwhile, the tire side wall is a part of the tire subjected to extremely frequent deflection deformation and has excellent deflection crack resistance. Therefore, it is necessary to develop an aging-resistant and flex-resistant rubber material with excellent performance and low cost, and great economic and social benefits can be generated.
Disclosure of Invention
The invention aims to improve the aging resistance and the flex resistance of the tire side rubber and reduce the production cost. The natural rubber and the butadiene rubber are compounded and matched, and self-made anti-aging and anti-flexing elastomers, carbon black, white carbon black, cellulose, high-temperature insoluble sulfur, an anti-reversion agent, environment-friendly aromatic oil, microcrystalline wax HG75, an accelerator, nano zinc oxide, stearic acid, an anti-aging agent and the like are added for modification, so that the anti-aging performance of the tire side rubber can be ensured, and the anti-flexing and cracking performance and the fatigue resistance performance of the tire side rubber can be ensured. The materials needed by the preparation are low in price and easy to obtain, the preparation process is simple, the flex-tortoise crack resistance is outstanding, and the aging resistance is excellent.
In one aspect, the present application provides a composition for preparing rubber comprising, by weight: 100 parts of raw rubber, 5-15 parts (such as 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15 parts) of self-made aging-resistant and flex-resistant elastomer, 20-30 parts (such as 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 parts) of carbon black, 6-9 parts (such as 6, 7, 8 or 9 parts) of white carbon black, 3 parts of cellulose, 1.5-2 parts (such as 1.5, 1.6, 1.7, 1.8, 1.9 or 2 parts) of high-temperature insoluble sulfur HDOT-20, 1-2 parts (such as 4, 5, 6, 7 or 8 parts) of environment-friendly aromatic oil V500-8 parts (such as 4, 5, 6, 7 or 8 parts) of microcrystalline wax HG75 parts, 1.5-2.5 parts (such as 1.5, 2 or 2.5 parts) of anti-reversion agent, 2-4 parts (such as 2, 3 or 4 parts) of nano zinc oxide, 2 or 4 parts (such as 2, 3.5 parts) of stearic acid, 3.5 parts (such as 3.5 parts) or 3 parts of anti-4 parts of anti-aging agent);
wherein the raw rubber is 70-80 parts of natural rubber (such as 70, 71, 72, 73, 74, 75, 76, 77, 78, 79 or 80 parts), and 20-30 parts of butadiene rubber (such as 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 parts);
the self-made aging-resistant and deflection-resistant elastomer is a blend of trans-butadiene-isoprene rubber grafted maleic anhydride (TBIR-g-MAH) and styrene-butadiene-styrene block copolymer (SBS);
the aging-resistant and deflection-resistant elastomer is prepared by a preparation method comprising the following steps of:
(1) Weighing 85-90 parts (such as 85, 86, 87, 88, 89 or 90 parts) of trans-butyl-pentyl rubber (TBIR), 3-4 parts of dibenzoyl peroxide (BPO) and 5-10 parts (such as 5, 6, 7, 8, 9 or 10 parts) of Maleic Anhydride (MAH);
(2) Adding trans-butyl amyl rubber and xylene into a flask, stirring and heating to 70-110 ℃ (such as 100 ℃) to fully dissolve the trans-butyl amyl rubber in a solvent; in certain embodiments, the mass ratio of trans-butadiene rubber to xylene is 1:5 or greater, e.g., 1:5 to 1:6;
(3) Adding the maleic anhydride monomer and the dibenzoyl peroxide into a flask according to a proportion, and fully stirring;
(4) After the reaction is finished, precipitating the product by using acetone, then performing suction filtration by using a funnel, and drying;
(5) Extracting the dried product in acetone for 2-4 h (for example, 3 h) by using an extractor, and purifying to remove unreacted monomers and an initiator;
(6) And drying the purified product in vacuum at 55-65 ℃ (such as 60 ℃) to constant weight for later use to obtain the trans-butyl amyl rubber grafted maleic anhydride product.
(7) Weighing 80-100 parts (such as 80, 85, 90, 95 or 100 parts) of trans-butadiene rubber grafted maleic anhydride (TBIR-g-MAH) and 80-100 parts (such as 80, 85, 90, 95 or 100 parts) of styrene-butadiene-styrene block copolymer (SBS), setting the temperature of a torque rheometer to be 100-125 ℃ (such as 110 ℃), setting the rotating speed of a rotor to be 40-70 rpm (such as 50 rpm), sequentially adding SBS and TBIR-g-MAH, mixing for 10-15 min, and taking out to obtain the self-made aging-resistant and flex-resistant elastomer.
Trans-butadiene-isoprene rubber used in the present invention refers to trans-1,4-butadiene-isoprene copolymer rubber (TBIR), and is a multi-block copolymer composed of isoprene and butadiene structural units having a high trans-1,4-structure.
The anti-reversion agent is selected from HTS, PK-900 or combination thereof;
the anti-aging agent is selected from RD, 4020, 4030, 4010NA, DFC-34 or any combination thereof;
the accelerant is selected from DPG, CZ, TBBS-80 or any combination thereof;
the carbon black is selected from N375, N330, N234, or any combination thereof.
In the text, HTS and PK-900 are anti-vulcanization reversion agent grades, RD, 4020, 4030, 4010NA and DFC-34 are anti-aging agent grades, DPG, CZ and TBBS-80 are accelerator grades, HDOT-20 is an insoluble sulfur grade, N375, N330 and N234 are carbon black grades, V500 is a grade of environment-friendly aromatic oil, and HG75 is a grade of microcrystalline wax. The above 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:
the rotor speed of an internal mixer (for example, a GK400 type internal mixer) is adjusted to 50 to 55 r.min -1 (e.g., 52 r.min) -1 ) Adding raw rubber, a self-made anti-aging and anti-flexing elastomer, nano zinc oxide and stearic acid, pressing a weight for 34-36 s (for example, 35 s) → adding carbon black, white carbon black and cellulose, mixing until the temperature reaches 119-121 ℃ (for example, 120 ℃) → adding environment-friendly aromatic oil, mixing until the temperature reaches (150 +/-5) ° C → discharging rubber, and obtaining a first-stage rubber compound;
step two:
the rotor speed of the internal mixer is adjusted to 41 to 43 r.min -1 (e.g., 42 r. Min) -1 ) Adding a first-stage rubber compound, microcrystalline wax and an anti-aging agent, and pressing for 29-31 s (for example, 30 s) → mixing until the temperature reaches (135 +/-5) ° C → rubber discharge to obtain a second-stage rubber compound;
step three:
the rotor speed of an internal mixer (for example, a GK255 type internal mixer) is adjusted to 19 to 21 r.min -1 (e.g., 20 r.min) -1 ) Adding three-stage rubber compound, sulfur, an accelerator and an anti-vulcanization reversion agent, pressing a ram for 34-36 s (for example, 35 s), and mixing until the temperature reaches 102-104 ℃ (for example, 103 ℃) → rubber discharge.
In one aspect, the present application provides a rubber obtained from the above composition or preparation method.
In certain embodiments, the rubbers of the present invention have one or more of the following characteristics:
(1) Tensile strength: 23 to 25MPa;
(2) 300% stress at definite elongation: 15 to 17MPa;
(3) The number of flexions: no cracking for 300 ten thousand times;
(4) Ozone aging test (ozone concentration 50ppm, relative humidity 60%, temperature 40 ℃, elongation 20%): no crack after 240 h;
(5) Elongation at break/%: 550 to 575.
The above parameters can be measured by methods conventional in the art, for example, the methods described in GB/T528-2009, GB/T13934-2006 or GB/T7726-2014.
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 sidewall rubber for a tire.
In one aspect, the present application provides a product comprising, or made from, the rubber of the present invention. In certain embodiments, the product is selected from the group consisting of tires, rubber tracks, conveyor belts, shock absorbers.
The application also provides a vehicle or a construction machine, which comprises the tire.
Advantageous effects of the invention
The invention improves the formula of the sidewall rubber of the conventional engineering machinery tire, and the rubber material with the new formula has the following advantages:
(1) The rubber material prepared by the preparation components provided by the invention has excellent aging resistance and flex resistance, especially excellent ozone aging resistance, so that the anti-cracking performance of the rubber is greatly improved;
(2) Self-made aging-resistant and deflection-resistant elastomers which are perfectly compatible with a raw rubber system are added, so that the aging resistance and deflection resistance are improved while the strength is maintained;
(3) The 300% stress at definite elongation and the aging resistance of the trial-manufactured tire are improved, the flex resistance is excellent, and the service life of the tire is prolonged.
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
An anti-aging and anti-flexing tire side rubber is characterized in that: 80 parts of natural rubber, 20 parts of butadiene rubber, 8 parts of self-made anti-aging and anti-flexing elastomer, 20 parts of carbon black, 6 parts of white carbon black and 3 parts of cellulose; 2 parts of high-temperature insoluble sulfur, 1 part of anti-vulcanization reversion agent HTS, 1 part of anti-vulcanization reversion agent PK-900 parts, 500 4 parts of environment-friendly aromatic oil V, 752 parts of microcrystalline wax HG, 2.5 parts of promoter CZ, 2 parts of nano zinc oxide, 2 parts of stearic acid and 4 parts of anti-aging agent RD.
The method comprises the following steps:
in an internal mixer of GK400 type. The rotating speed of the mixing rotor is 52 r.min -1 Preparing raw rubber, self-making an anti-aging and anti-flexing elastomer, nano zinc oxide and stearic acid, pressing for (35 s) → adding carbon black, white carbon black and cellulose, mixing until the temperature reaches 120 → adding environment-friendly aromatic oil, and mixing until the temperature reaches (150 +/-5) → discharging rubber;
step two:
the rotating speed of the two-stage mixing rotor is 42 r.min -1 The mixing process comprises the following steps: one-section rubber compound, microcrystalline paraffin and an anti-aging agent, wherein the weight is pressed for 30s → glue discharging (135 +/-5) DEG C;
step three:
in a GK255 type internal mixer, the rotating speed of a rotor is 20 r.min -1 The mixing process comprises the following steps: three-stage rubber compound, sulfur, an accelerator, an anti-vulcanization reversion agent and a pressure ram (35 s) are mixed until the temperature reaches 103 ℃ → rubber discharge.
The aging-resistant and flex-resistant elastomer is prepared by a preparation method comprising the following steps:
(1) Weighing 85 parts of trans-butyl-pentyl rubber (TBIR), 4 parts of dibenzoyl peroxide (BPO) and 6 parts of Maleic Anhydride (MAH);
(2) Adding trans-butadiene-isoprene rubber and xylene into a flask according to the mass ratio of 1:6, stirring, heating to 100 ℃ and fully dissolving the trans-butadiene-isoprene rubber in a solvent;
(3) Adding the maleic anhydride monomer and the dibenzoyl peroxide into a flask according to a proportion, and fully stirring;
(4) After the reaction is finished, precipitating the product by acetone, then carrying out suction filtration by using a funnel, and drying;
(5) Extracting the dried product in acetone for 3h by using an extractor, and purifying to remove unreacted monomers and an initiator;
(6) And drying the purified product at 60 ℃ in vacuum to constant weight for later use to obtain the trans-butadiene-isoprene rubber grafted maleic anhydride product.
(7) Weighing 100 parts of trans-butadiene-isoprene rubber grafted maleic anhydride (TBIR-g-MAH) and 100 parts of styrene-butadiene-styrene block copolymer (SBS), setting the temperature of a torque rheometer at 110 ℃, the rotating speed of a rotor at 50rpm, sequentially adding SBS and TBIR-g-MAH,
mixing for 15min, and taking out to obtain the self-made anti-aging and anti-flexing elastomer.
Example 2
An anti-aging and anti-flexing tire side rubber is characterized in that: 80 parts of natural rubber, 20 parts of butadiene rubber, 10 parts of self-made anti-aging and anti-flexing elastomer, 25 parts of carbon black, 7 parts of white carbon black and 3 parts of cellulose; the high-temperature-resistant environment-friendly anti-reversion agent comprises, by weight, 20 parts of high-temperature insoluble sulfur HDOT, 2 parts of an anti-reversion agent HTS, 500 parts of environment-friendly aromatic oil V, 75 parts of microcrystalline wax HG, 2 parts of a promoter CZ, 3 parts of nano zinc oxide, 3 parts of stearic acid and 0 part of an anti-aging 4024.
The method comprises the following steps:
in an internal mixer of GK400 type. The rotation speed of the mixing rotor is 52 r.min -1 Preparing raw rubber, self-made aging-resistant and flex-resistant elastomer, nano zinc oxide and stearic acid, pressing weight (35 s) → adding carbon black, white carbon black and cellulose, mixing until the temperature reaches 120 → adding environment-friendly aromatic oil, and mixing until the temperature reaches (150 +/-5) → discharging rubber;
step two:
the rotating speed of the two-stage mixing rotor is 42 r.min -1 The mixing process comprises the following steps: one-section rubber compound, microcrystalline paraffin and an anti-aging agent, wherein the weight is pressed for 30s → glue discharging (135 +/-5) DEG C;
step three:
in a GK255 type internal mixer, the rotating speed of a rotor is 20 r.min -1 Mixing processComprises the following steps: three-stage rubber compound, sulfur, an accelerator, an anti-vulcanization reversion agent and a pressure ram (35 s) are mixed until the temperature reaches 103 ℃ → rubber discharge.
The aging-resistant and flex-resistant elastomer is prepared by a preparation method comprising the following steps:
(1) Weighing 85 parts of trans-butyl-pentyl rubber (TBIR), 4 parts of dibenzoyl peroxide (BPO) and 6 parts of Maleic Anhydride (MAH);
(2) Adding trans-butadiene-isoprene rubber and xylene into a flask according to the mass ratio of 1:6, stirring, heating to 100 ℃ and fully dissolving the trans-butadiene-isoprene rubber in a solvent;
(3) Adding the maleic anhydride monomer and the dibenzoyl peroxide into a flask according to a certain proportion, and fully stirring;
(4) After the reaction is finished, precipitating the product by using acetone, then performing suction filtration by using a funnel, and drying;
(5) Extracting the dried product in acetone for 3 hours by using an extractor, and purifying to remove unreacted monomers and an initiator;
(6) And drying the purified product at 60 ℃ in vacuum to constant weight for later use to obtain the trans-butyl amyl rubber grafted maleic anhydride product.
(7) Weighing 100 parts of trans-butadiene-isoprene rubber grafted maleic anhydride (TBIR-g-MAH) and 100 parts of styrene-butadiene-styrene block copolymer (SBS), setting the temperature of a torque rheometer at 110 ℃ and the rotor speed at 50rpm, sequentially adding SBS and TBIR-g-MAH, mixing for 15min, and taking out to obtain the self-made anti-aging and anti-flexing elastomer.
Example 3
An anti-aging and anti-flexing tire side rubber is characterized in that: 80 parts of natural rubber, 20 parts of butadiene rubber, 15 parts of self-made anti-aging and anti-flexing elastomer, 30 parts of carbon black, 9 parts of white carbon black and 3 parts of cellulose; the high-temperature-resistant anti-reversion agent comprises, by weight, 20 parts of high-temperature insoluble sulfur HDOT, 1 part of anti-reversion agent HTS, 1 part of anti-reversion agent PK-900, 500 parts of environment-friendly aromatic oil V, 75 parts of microcrystalline wax HG, 2 parts of promoter CZ, 3 parts of nano zinc oxide, 3 parts of stearic acid and 3 parts of anti-aging 4020.
The method comprises the following steps:
in an internal mixer of GK400 type.The rotation speed of the mixing rotor is 52 r.min -1 Preparing raw rubber, self-made aging-resistant and flex-resistant elastomer, nano zinc oxide and stearic acid, pressing weight (35 s) → adding carbon black, white carbon black and cellulose, mixing until the temperature reaches 120 → adding environment-friendly aromatic oil, and mixing until the temperature reaches (150 +/-5) → discharging rubber;
step two:
the rotating speed of the two-stage mixing rotor is 42 r.min -1 The mixing process comprises the following steps: one-section rubber compound, microcrystalline paraffin and an anti-aging agent, wherein the weight is pressed for 30s → glue discharging (135 +/-5) DEG C;
step three:
in a GK255 type internal mixer, the rotating speed of a rotor is 20 r.min -1 The mixing process comprises the following steps: three-stage rubber compound, sulfur, an accelerator, an anti-vulcanization reversion agent and a pressure ram (35 s) are mixed until the temperature reaches 103 ℃ → rubber discharge.
The aging-resistant and flex-resistant elastomer is prepared by a preparation method comprising the following steps:
(1) Weighing 85 parts of trans-butyl-pentyl rubber (TBIR), 4 parts of dibenzoyl peroxide (BPO) and 6 parts of Maleic Anhydride (MAH);
(2) Adding trans-butyl amyl rubber and xylene into a flask according to the mass ratio of 1:6, stirring and heating to 100 ℃ to fully dissolve the trans-butyl amyl rubber in a solvent;
(3) Adding the maleic anhydride monomer and the dibenzoyl peroxide into a flask according to a proportion, and fully stirring;
(4) After the reaction is finished, precipitating the product by acetone, then carrying out suction filtration by using a funnel, and drying;
(5) Extracting the dried product in acetone for 3h by using an extractor, and purifying to remove unreacted monomers and an initiator;
(6) And drying the purified product at 60 ℃ in vacuum to constant weight for later use to obtain the trans-butyl amyl rubber grafted maleic anhydride product.
(7) Weighing 100 parts of trans-butadiene-isoprene rubber grafted maleic anhydride (TBIR-g-MAH) and 100 parts of styrene-butadiene-styrene block copolymer (SBS), setting the temperature of a torque rheometer at 110 ℃, the rotating speed of a rotor at 50rpm, sequentially adding SBS and TBIR-g-MAH, mixing for 15min, and taking out to obtain the self-made anti-aging and anti-flexing elastomer.
Comparative example 1
The comparative example is prepared from the following raw materials in parts by weight: 80 parts of natural rubber, 20 parts of butadiene rubber, 25 parts of carbon black, 7 parts of white carbon black, 2 parts of sulfur, 500 parts of environment-friendly aromatic oil V, 75 parts of microcrystalline wax HG, 2 parts of promoter CZ, 3 parts of zinc oxide, 3 parts of stearic acid and 4 parts of anti-aging 4020.
Placing raw rubber into an open rubber mixing mill for plasticating for 2min, sequentially adding an anti-aging agent, zinc oxide, stearic acid, microcrystalline wax, carbon black, white carbon black and environment-friendly aromatic oil 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. After the rubber sheet is parked for 12 hours, the rubber sheet is put into a mold and vulcanized in a flat vulcanizing machine at the temperature of 155 ℃ for 10min.
The results of the performance tests of several examples are shown in table 1 by the performance test.
TABLE 1 results of rubber Properties measurements
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 (7)
1. A composition for preparing rubber comprising, in weight ratios: 100 parts of raw rubber, 5-15 parts of self-made anti-aging and anti-flexing elastomer, 20-30 parts of carbon black, 6-9 parts of white carbon black, 3 parts of cellulose, 1.5-2 parts of high-temperature insoluble sulfur HDOT-1.5 parts, 1-2 parts of anti-vulcanization reversion agent, 500-8 parts of environment-friendly aromatic oil V, 75 parts of microcrystalline wax HG, 1.5-2.5 parts of accelerator, 2-4 parts of nano zinc oxide, 2-3 parts of stearic acid and 3-4 parts of anti-aging agent;
the raw rubber comprises the following components: 70-80 parts of natural rubber and 20-30 parts of butadiene rubber;
the self-made aging-resistant and deflection-resistant elastomer is a blend of trans-butadiene-isoprene rubber grafted maleic anhydride (TBIR-g-MAH) and styrene-butadiene-styrene block copolymer (SBS);
the anti-aging and anti-flexing elastomer is prepared by a preparation method comprising the following steps:
(1) Weighing 85-90 parts of trans-butyl-pentyl rubber (TBIR), 3-4 parts of dibenzoyl peroxide (BPO) and 5-10 parts of Maleic Anhydride (MAH);
(2) Adding trans-butyl-pentyl rubber and xylene into a flask, stirring and heating to 70-110 ℃ to fully dissolve the trans-butyl-pentyl rubber in a solvent;
(3) Adding the maleic anhydride monomer and the dibenzoyl peroxide into a flask according to a proportion, and fully stirring;
(4) After the reaction is finished, precipitating the product by acetone, then carrying out suction filtration by using a funnel, and drying;
(5) Extracting the dried product in acetone for 2-4 h (for example, 3 h) by using an extractor, and purifying to remove unreacted monomers and an initiator;
(6) Drying the purified product in vacuum at 55-65 ℃ (such as 60 ℃) to constant weight for later use to obtain the trans-butyl amyl rubber grafted maleic anhydride product;
(7) Weighing 80-100 parts of trans-butyl amyl rubber grafted maleic anhydride (TBIR-g-MAH) and 80-100 parts of styrene-butadiene-styrene block copolymer (SBS), setting the temperature of a torque rheometer to be 100-125 ℃, setting the rotating speed of a rotor to be 40-70 rpm, sequentially adding SBS and TBIR-g-MAH, mixing for 10-15 min, and taking out to obtain a self-made anti-aging and anti-flexing elastomer;
the anti-reversion agent is selected from HTS, PK-900 or combination thereof;
the anti-aging agent is selected from RD, 4020, 4030, 4010NA, DFC-34 or any combination thereof;
the accelerant is selected from DPG, CZ, TBBS-80 or any combination thereof;
the carbon black is selected from N375, N330, N234, or any combination 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:
the rotor speed of the internal mixer is adjusted to 50 to 55 r.min -1 Adding raw rubber, a self-made aging-resistant and deflection-resistant elastomer, nano zinc oxide and stearic acid, pressing a weight for 34-36 s → adding carbon black, white carbon black and cellulose, mixing until the temperature reaches 119-121 ℃ → adding environment-friendly aromatic oil, mixing until the temperature reaches (150 +/-5) ° C → discharging rubber, and obtaining a section of rubber compound;
step two:
the rotor speed of the internal mixer is adjusted to 41 to 43 r.min -1 Adding a first-stage rubber compound, microcrystalline wax and an anti-aging agent, pressing a weight for 29-31 s → mixing until the temperature reaches (135 +/-5) ° C → rubber discharge to obtain a second-stage rubber compound;
step three:
the rotor speed of the internal mixer is adjusted to 19 to 21 r.min -1 (e.g., 20 r.min) -1 ) Adding three-stage rubber compound, sulfur, an accelerator and an anti-vulcanization reversion agent, pressing a weight for 34-36 s → pressing the weight, and mixing until the temperature reaches 102-104 ℃ → rubber discharge.
3. A rubber obtained from the composition of claim 1 or the process of claim 2.
4. The rubber of claim 3 having one or more of the following characteristics:
(1) Tensile strength: 23 to 25MPa;
(2) 300% stress at definite elongation: 15 to 17MPa;
(3) The number of flexions: no cracking for 300 ten thousand times;
(4) Ozone aging test (ozone concentration 50ppm, relative humidity 60%, temperature 40 ℃, elongation 20%): no crack after 240 h;
(5) Elongation at break/%: 550 to 575.
5. Use of the rubber of claim 3 or 4 for the production of tires;
preferably, the rubber is used for a sidewall rubber of a tire.
6. A product comprising or made from the rubber of claim 3 or 4;
preferably, the product is selected from the group consisting of tires, rubber tracks, conveyor belts, shock absorbers.
7. A vehicle or a working machine comprising a tyre according to claim 6.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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