Low-heat-generation rubber composition with excellent wear resistance and preparation method of low-heat-generation rubber composition

Abstract

The invention relates to the technical field of tire materials, and particularly discloses a low-heat-generation rubber composition with excellent wear resistance and a manufacturing method thereof.On the basis of 100 parts by weight of rubber, the rubber composition comprises 100 phr of rubber, 10-120 phr of a filler, 0.4-1.6 phr of a silane coupling agent, 3.0-12.0 phr of a plasticizer, 1.0-6.0 phr of zinc oxide masterbatch, 0.1-0.5 phr of an antioxidant, 0.1-0.2 phr of a lubricant, 0.1-0.2 phr of a lubricant, 0.1-0.2 phr of a lubricant, 0.1-0.2 phr of a lubricant, 0.1-0.2 phr of a lubricant, 0.1-0.2 phr of a lubricant, 0.1-0.2 The rubber material is prepared from the following components in percentage by weight: 0.5 to 4.0 phr of stearic acid, 1.0 to 4.0 phr of an anti-aging agent, 0.5 to 3.0 phr of protective wax, 0.5 to 3.0 phr of sulfur, 0.5 to 3.0 phr of an accelerant, 0.1 to 1.0 phr of a peptizer, 0.2 to 1.0 phr of a scorch retarder and 0.5 to 5.0 phr of a carbon black coupling agent. According to the present invention, the design is performed according to the existing requirements, and the carbon black coupling agent composition is used, such that the heat generation performance of the rubber material can be reduced, and the tire wear resistance can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying, in particular to a low-heat-generating rubber composition with excellent wear resistance and a preparation method thereof. Background Art

[0002] The rolling resistance of automobile tires has a significant impact on the vehicle's fuel consumption and performance: 1) In terms of fuel consumption, the greater the rolling resistance, the greater the resistance the vehicle needs to overcome during driving, so the engine needs to consume more fuel to maintain power output, resulting in increased fuel consumption levels; 2) In terms of acceleration performance, higher rolling resistance means that the tires require stronger power during acceleration, which will have a negative impact on the vehicle's acceleration performance and slow the acceleration process.

[0003] For electric vehicles, high rolling resistance will reduce the battery's range and further affect the overall performance of the vehicle; high resistance will reduce the effective traction between the tires and the ground, especially on wet and slippery roads, which may reduce the stability and safety of the vehicle.

[0004] As one of the earliest reinforcing fillers, carbon black holds an unshakable position of importance in the rubber industry. Rubber / carbon black composites, due to their excellent mechanical properties, are widely used in tire manufacturing. However, due to the strong van der Waals forces between carbon black particles, carbon black easily agglomerates within the rubber matrix. Under high frequency and high load conditions, friction between the carbon black particles intensifies, leading to increased hysteresis losses in the composite material. This inevitably impacts the composite's overall performance, resulting in high tire heat generation and rolling resistance.

[0005] Low rolling resistance, wear resistance, and wet skid resistance are the tire's "devil's triangle." Reducing rolling resistance while increasing wear is a technically challenging problem. Small-particle carbon black is the primary reinforcing filler in all-steel load-bearing tires. Tread formulations designed to reduce rolling resistance typically use a combination of carbon black and silica. However, silica's reinforcing properties are significantly weaker than carbon black, significantly reducing wear resistance. Achieving both low rolling resistance and wear resistance is challenging.

[0006] Based on this, a low-heat-generation rubber composition with excellent wear resistance and a method for producing the same are now provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0007] The object of the present invention is to provide a low-heat-generation rubber composition with excellent wear resistance and a method for producing the same, thereby solving the problem of inconvenience in use in the prior art.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The invention discloses a low-heat rubber composition with excellent wear resistance. The rubber composition comprises, based on 100 parts by weight of rubber, 10-120 parts by weight of a filler, 0.4-1.6 parts by weight of a silane coupling agent, 3.0-12.0 parts by weight of a plasticizer, 1.0-6.0 parts by weight of a zinc oxide masterbatch, 0.5-4.0 parts by weight of a stearic acid, 1.0-4.0 parts by weight of an antioxidant, 0.5-3.0 parts by weight of a protective wax, 0.5-3.0 parts by weight of sulfur, 0.5-3.0 parts by weight of an accelerator, 0.1-1.0 parts by weight of a peptizer, 0.2-1.0 parts by weight of a scorch retarder, and 0.5-5.0 parts by weight of a carbon black coupling agent.

[0010] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0011] In an optional solution: the carbon black has a nitrogen adsorption specific surface area of more than 120m2 / g and a DBP oil absorption value of more than 120cm3 / 100g.

[0012] In an optional solution, the white carbon black is low specific surface area white carbon black, with a BET specific surface area of 45-55 m2 / g and an ignition content of 0.1%-0.4%.

[0013] In one alternative, the rubber composition is cured using a sulfur cure system.

[0014] In an optional embodiment, the carbon black coupling agent contains the sulfide shown below.

[0015] Molecular structure: [(NH2)2Y 1 ] m -Z 1 -S X -Z 2 -[Y 2 (NH2)2] n

[0016] Where: -x is 2 to 8;

[0017] - Z1 and Z2 are the same or different and each represents a divalent hydrocarbon group containing 1 to 8 carbon atoms;

[0018] -Y1 and Y2 are the same or different and are selected from one or more of a linear or branched C6-C30 unsaturated hydrocarbon group, a C3-C6 cycloalkane group, a C3-C6 cycloaromatic hydrocarbon group, and a long-chain acyl group;

[0019] m=an integer from 1 to 30.

[0020] n=an integer from 1 to 30.

[0021] In one alternative: Molecular formula: [(NH2)2Y1 ] m -Z 1 -S X -Z 2 -[Y 2 (NH2)2] n

[0022] Where: -x is 2 to 5.

[0023] A method for producing a low-heat-generation rubber composition with excellent wear resistance comprises the following steps:

[0024] Step 1: Use a shear type internal mixer for mixing:

[0025] Add all rubber components and peptizer, press the top plug and hold for 30-40 seconds;

[0026] Raise the top bolt, add carbon black and carbon black coupling agent, and press the top bolt to heat the rubber compound to 110-115℃;

[0027] Raise the top bolt, add 1 / 2 amount of plasticizer and stearic acid, press the top bolt to heat the rubber compound to 145℃~155℃, and keep the constant temperature for 60~150 seconds;

[0028] Raise the top bolt, discharge the glue and press it into sheets, then cool it to room temperature to make a masterbatch;

[0029] Step 2: Use intermeshing internal mixer for two-stage mixing:

[0030] Add the masterbatch obtained in step 1, press the top plug and hold for 15 to 20 seconds;

[0031] Raise the top bolt, add white carbon black, silane coupling agent and antioxidant, and press the top bolt to heat the rubber compound to 110-120℃;

[0032] Raise the top bolt, add the remaining 1 / 3 of the plasticizer, press the top bolt to raise the temperature of the rubber compound to 140-150℃, and maintain the constant temperature for 80-120 seconds;

[0033] Raise the top bolt, discharge the glue and press it into sheets, then cool it to room temperature to make the second-stage masterbatch;

[0034] Step 3: Use shear type internal mixer for final refining and sulfur addition:

[0035] Add the second-stage masterbatch obtained in step 2, zinc oxide masterbatch, vulcanizing agent, and accelerator;

[0036] Press the top bolt to raise the temperature of the rubber compound to 70-80℃;

[0037] Raise the top bolt and hold for 5-10 seconds;

[0038] Press the top bolt to raise the temperature of the rubber compound to 80-90℃;

[0039] Raise the top bolt and hold for 5-10 seconds;

[0040] Press the top bolt to heat the rubber compound to 90-100℃, discharge the rubber compound and press it into sheets.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention is designed in response to existing needs and applies a carbon black coupling agent composition, which can reduce the heat generation performance of the rubber material and improve the wear resistance of the tire. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The rubber composition of the present invention comprises, based on 100 parts by weight of rubber (phr), 100 parts by weight of a diene elastomer, 10-120 parts by weight of a filler, 0.4-1.6 parts by weight of a silane coupling agent, 3.0-12.0 parts by weight of a plasticizer, 1.0-6.0 parts by weight of zinc oxide, 0.5-4.0 parts by weight of stearic acid, 1.0-4.0 parts by weight of an antioxidant, 0.5-3.0 parts by weight of a protective wax, 0.5-3.0 parts by weight of sulfur, 0.5-3.0 parts by weight of an accelerator, 0.1-1.0 parts by weight of a peptizer, 0.2-1.0 parts by weight of a scorch retarder, and 0.5-5.0 parts by weight of a carbon black coupling agent.

[0045] In the rubber composition of the present invention, the filler comprises carbon black and silica. The carbon black has a nitrogen adsorption specific surface area of 120 m² / g or greater and a DBP oil absorption value of 120 cm³ / 100g or greater; the silica is low-surface-area silica with a BET specific surface area of 45-55 m² / g and an ignition content of 0.1%-0.4%. The weight ratios of carbon black (a) and silica (b) satisfy the following relationship: 1≤a:b≤6.

[0046] In the rubber composition of the present invention, the total content of the carbon black coupling agent is between 1% by weight and 10% by weight relative to the amount of the carbon black.

[0047] The rubber composition is characterized in that the carbon black coupling agent is a sulfide represented by the following (I).

[0048] Molecular structure: [(NH2)2Y 1 ] m -Z 1 -SX -Z 2 -[Y 2 (NH2)2] n。

[0049] Wherein: -x is a decimal from 2 to 8, preferably from 2 to 5;

[0050] - Z1 and Z2 are the same or different and each represents a divalent hydrocarbon group containing 1 to 8 carbon atoms;

[0051] -Y1 and Y2 are the same or different and are selected from one or more of a linear or branched C6-C30 unsaturated hydrocarbon group, a C3-C6 cycloalkane group, a C3-C6 cycloaromatic hydrocarbon group, and a long-chain acyl group;

[0052] m=an integer from 1 to 30.

[0053] n=an integer from 1 to 30.

[0054] There are no special requirements for other ingredients;

[0055] The rubber composition can be mixed using methods known to those skilled in the art of rubber mixing. For example, typically, the components are mixed in at least two stages, namely, at least one non-productive mixing stage followed by a productive mixing stage. The rubber and polymer resin are mixed in one or more non-productive mixing stages;

[0056] Example 1

[0057] The rubber compositions specified in Tables 1 and 2 were prepared in a BR Banbury internal mixer using two separate mixing stages: a non-productive mixing stage and a productive mixing stage. The non-productive mixing stage lasted approximately 2-3 minutes, until the rubber temperature reached 150-155°C. The productive mixing stage was completed by mixing until the rubber temperature reached 100°C.

[0058] The rubber compositions are referred to herein as Example 1, Example 2, and Comparative Example. The Comparative Example is used herein as a control sample, that is, the carbon black coupling agent of the present invention is not used in the filler system.

[0059] All samples were vulcanized at about 151°C for about 30 minutes. Table 2 shows the physical properties of the samples of Comparative Example / Example 1 / Example 2;

[0060] Table 1:

[0061]

[0062] The values obtained for the compositions of the comparative examples were determined as 100 as a reference;

[0063] Table 2:

[0064] 151℃*30min vulcanization Example 1 Example 2 Comparative Example hardness 100 103 100 100% modulus of tensile stress 131 146 100 300% modulus of tensile stress 138 150 100 Reinforcement coefficient 105 103 100 tensile strength 96 99 100 Elongation at break 80 75 100 Din wear 133 133 100 Compression heat 74 72 100 tanδ60℃ 70 62 100

[0065] These results indicate that the application of the carbon black coupling agent composition can reduce the heat generation of the rubber compound and improve the wear resistance of the tire.

[0066] Viscoelasticity was measured using a dynamic thermodynamic spectrometer according to GB / T 9870.1, with tan δ measured at 60°C, 5% strain, and 15 Hz. The comparative example was set to 100 and the index values were expressed. Lower tan δ values at 60°C indicate better heat generation performance.

[0067] Heat generation performance was measured using a compression heat generation tester according to GB / T 1687 at 55°C, a load of 108N, and a frequency of 30Hz. The values for the comparative example were set to 100 and the index values were expressed. Lower compression heat generation values indicate better heat generation performance.

[0068] Wear resistance was measured using a DIN abrasion tester according to GB / T 9867. The values of the comparative example were set to 100 and the values were expressed as indices. A higher DIN index indicates better wear resistance.

[0069] In the present invention, the use of carbon black coupling agent is considered to be excellent in reducing heat generation of rubber and improving wear resistance.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low heat build-up rubber composition with excellent wear resistance, characterized in that: The rubber composition contains, based on 100 parts by weight of rubber, 10-120 parts by weight of filler, 0.4-1.6 parts by weight of silane coupling agent, 3.0-12.0 parts by weight of plasticizer, 1.0-6.0 parts by weight of zinc oxide masterbatch, 0.5-4.0 parts by weight of stearic acid, 1.0-4.0 parts by weight of antioxidant, 0.5-3.0 parts by weight of protective wax, 0.5-3.0 parts by weight of sulfur, 0.5-3.0 parts by weight of accelerator, 0.1-1.0 parts by weight of peptizer, 0.2-1.0 parts by weight of anti-scorch agent, and 0.5-5.0 parts by weight of carbon black coupling agent.

2. The low heat build-up rubber composition with excellent wear resistance according to claim 1, characterized in that: The carbon black has a nitrogen adsorption specific surface area of more than 120 m2 / g and a DBP oil absorption value of more than 120 cm3 / 100g.

3. The low heat build-up rubber composition with excellent wear resistance according to claim 1, characterized in that: The white carbon black is low specific surface area white carbon black, with a BET specific surface area of 45-55 m2 / g and an ignition content of 0.1%-0.4%.

4. The low heat build-up rubber composition with excellent wear resistance according to claim 1, characterized in that: The rubber composition is cured using a sulfur cure system.

5. The low heat build-up rubber composition with excellent wear resistance according to claim 1, characterized in that: The carbon black coupling agent contains the sulfide shown below; Molecular structure: [(NH2)2Y 1 ] m -Z 1 -S X -Z 2 -[Y 2 (NH2)2] n Where: -x is 2 to 8; -Z 1 and Z 2 are the same or different and each represents a divalent hydrocarbon group containing 1 to 8 carbon atoms; -Y 1 and Y 2 The same or different, one or more selected from linear or branched C6-C30 unsaturated hydrocarbon groups, C3-C6 cycloalkane groups, C3-C6 cycloaromatic hydrocarbon groups, and long-chain acyl groups; m=an integer from 1 to 30; n=an integer from 1 to 30.

6. The low heat build-up rubber composition with excellent wear resistance according to claim 5, characterized in that: Molecular structure: [(NH2)2Y 1 ] m -Z 1 -S X -Z 2 -[Y 2 (NH2)2] n Where: -x is 2 to 5.

7. A method for producing the low heat build-up rubber composition with excellent wear resistance according to claim 1, characterized in that: The following steps are involved: Step 1: Use a shear type internal mixer for mixing: Add all rubber components and peptizer, press the top plug and hold for 30-40 seconds; Raise the top bolt, add carbon black and carbon black coupling agent, and press the top bolt to heat the rubber compound to 110-115℃; Raise the top bolt, add 1 / 2 amount of plasticizer and stearic acid, press the top bolt to heat the rubber compound to 145℃~155℃, and keep the constant temperature for 60~150 seconds; Raise the top bolt, discharge the glue and press it into sheets, then cool it to room temperature to make a masterbatch; Step 2: Use intermeshing internal mixer for two-stage mixing: Add the masterbatch obtained in step 1, press the top plug and hold for 15 to 20 seconds; Raise the top bolt, add white carbon black, silane coupling agent and antioxidant, and press the top bolt to heat the rubber compound to 110-120℃; Raise the top bolt, add the remaining 1 / 3 of the plasticizer, press the top bolt to raise the temperature of the rubber compound to 140-150℃, and maintain the constant temperature for 80-120 seconds; Raise the top bolt, discharge the glue and press it into sheets, then cool it to room temperature to make the second-stage masterbatch; Step 3: Use shear type internal mixer for final refining and sulfur addition: Add the second-stage masterbatch obtained in step 2, zinc oxide masterbatch, vulcanizing agent, and accelerator; Press the top bolt to raise the temperature of the rubber compound to 70-80℃; Raise the top bolt and hold for 5-10 seconds; Press the top bolt to raise the temperature of the rubber compound to 80-90℃; Raise the top bolt and hold for 5-10 seconds; Press the top bolt to heat the rubber compound to 90-100℃, discharge the rubber compound and press it into sheets.

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