Tire base rubber composition for off-road tire

Abstract

The invention relates to the technical field of rubber, in particular to an off-road tire base rubber composition. Based on 100 parts by weight of natural rubber components, the natural rubber composition further comprises the following components in parts by weight: 20-40 parts of carbon black, 5-15 parts of silicon dioxide hydrate, 5-20 parts of nano zinc oxide, 1-3 parts of stearic acid, 1-3 parts of p-phenylenediamine, 1-3 parts of a ketoamine anti-aging agent, 1-3 parts of bis (triethoxysilyl) propyl tetrasulfide, 1-5 parts of carbon nanotubes CNT, 1-4 parts of N, N '-m-phenylene bismaleimide, 0.5-2 parts of sulfur and 0.5-2 parts of a sulfenamide accelerant. The modulus of the rubber material is improved by adding the CNT, so that the consumption of carbon black is reduced, and heat generation is reduced; by adding nano zinc oxide and carbon nanotubes, the heat conductivity of the rubber material is improved; and by adding the N, N '-m-phenylene bismaleimide, the heat resistance of the rubber material is improved.

Description

Technical Field

[0001] This invention relates to the field of rubber technology, and more specifically to an off-road tire base rubber composition. Background Technology

[0002] As is well known, off-road radial tires have large and deep tread blocks and poor heat dissipation. The continuous accumulation of heat causes the temperature of the rubber base to rise. When the temperature rises to a certain level, the cross-linking network degrades, the rubber performance decreases, and thus the tire shoulder and crown delamination problem occurs.

[0003] Existing tire base rubber formulations are mainly composed of natural rubber. By rationally adjusting the reinforcing and vulcanization systems, they can achieve low heat generation and heat resistance. However, due to limitations in the raw rubber system and traditional carbon black and silica-based reinforcing systems, the degree of improvement is limited. At the same time, the thermal conductivity of the rubber compound is poor, making it difficult to conduct heat away from the base in a timely manner. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an off-road tire base rubber composition that increases the modulus of the rubber compound, reduces the hysteresis loss of the base rubber, increases the thermal conductivity of the base rubber, and avoids heat accumulation in the tire base rubber, thus preventing the tire crown from delaminating from the base.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an off-road tire base rubber composition, characterized in that, based on 100 parts by weight of natural rubber component, it further comprises the following components by weight: Carbon black 20-40, Hydrated silica 5-15, Nano zinc oxide 5-20, Stearic acid 1-3, p-Phenylenediamine 1-3, Ketone amine anti-aging agents 1-3, bis(triethoxysilyl)propyltetrasulfide 1-3, Carbon nanotubes (CNTs) 1-5 N,N'-m-phenylene bismaleimide 1-4 Sulfur 0.5-2, 0.5-2% sulfenamide accelerator.

[0006] The carbon black has an iodine absorption value of 60-100 g / kg.

[0007] The hydrated silica with a BET specific surface area of ​​150-190 m² 2 / g.

[0008] The accelerator is a sulfenamide accelerator, including one or more of CZ, NOBS, and DZ.

[0009] The beneficial effects of this invention are that by adding carbon nanotubes (CNTs), the modulus of the adhesive is increased, thereby reducing the amount of carbon black used and reducing heat generation; by adding nano zinc oxide and carbon nanotubes, the thermal conductivity of the adhesive is increased; and by adding N,N'-m-phenylene bismaleimide, the heat resistance of the adhesive is improved. Detailed Implementation

[0010] The present invention will be further described below with reference to embodiments: The natural rubber of this invention is 20# standard rubber, the p-phenylenediamine antioxidant is N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, the ketamine antioxidant is 2,2,4-trimethyl-dihydroquinoline polymer, and the sulfenamide accelerator is N-tert-butyl-2-benzothiazole sulfenamide.

[0011] The technical solution adopted by this invention to solve the technical problem is as follows: by adding carbon nanotubes with high specific surface area and high aspect ratio to reinforce the rubber, the amount of carbon black added is reduced accordingly, thereby reducing the heat generation performance of the rubber compound; by adding nano-zinc oxide and carbon nanotubes (CNTs) with high thermal conductivity, the thermal conductivity of the rubber compound is improved. See Table 1 for details.

[0012] Table 1. Examples (The unit of content of each raw material in this table is: parts by weight) The performance test data of this invention embodiment are shown in Table 2.

[0013] Table 2: Performance Test Data This invention strengthens rubber by adding carbon nanotubes with high specific surface area and high aspect ratio, thereby reducing the amount of carbon black added, which in turn reduces the hysteresis loss of the rubber compound. The loss factor tgδ at 60℃ is reduced by about 20%, and the heat generation of the rubber compound is significantly reduced.

[0014] By adding nano-zinc oxide and carbon nanotube (CNT) materials with high thermal conductivity, the thermal conductivity of the rubber compound is increased by 23%, which can promptly dissipate the heat generated inside the tire base.

[0015] This invention improves the modulus of the rubber compound and reduces hysteresis loss by adding carbon nanotubes; it also improves the thermal conductivity of the tire base rubber compound by adding nano-zinc oxide and carbon nanotubes with high thermal conductivity; and it significantly improves the resistance to reversion and the performance retention rate after aging by using anti-reversion agents.

[0016] The base rubber is located at the bottom of the tire crown. Its main function is to support the crown and buffer the stress distribution between the tire body and the crown. Therefore, its heat generation, heat resistance and thermal conductivity are required to be extremely high. The composition of the present invention can effectively reduce the heat generation of the base rubber, improve the heat resistance, and conduct heat away in a timely manner, avoiding the accumulation of heat in the tire base rubber and the phenomenon of delamination between the crown and the base rubber, thereby improving the driving safety and service life of the tire.

Claims

1. A cross-country tire base rubber composition, characterized in that, Based on 100 parts by weight of natural rubber component, it also contains the following components by weight: Carbon black 20-40, Hydrated silica 5-15, Nano zinc oxide 5-20, Stearic acid 1-3, p-Phenylenediamine 1-3, Ketone amine anti-aging agents 1-3, bis(triethoxysilyl)propyltetrasulfide 1-3, Carbon nanotubes (CNTs) 1-5 N,N'-m-phenylene bismaleimide 1-4 Sulfur 0.5-2, 0.5-2% sulfenamide accelerator.

2. The off-road tire base rubber composition according to claim 1, characterized in that... The carbon black has an iodine absorption value of 60-100 g / kg.

3. The off-road tire base rubber composition according to claim 1, characterized in that... The hydrated silica with a BET specific surface area of ​​150-190 m² 2 / g.

4. The off-road tire base rubber composition according to claim 1, characterized in that... The accelerator is a sulfenamide accelerator, including one or more of CZ, NOBS, and DZ.

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