Oil-resistant tire tread rubber material

Abstract

The invention relates to the technical field of tire materials, and particularly discloses an oil-resistant tire tread rubber material which is used for solving the problems that in the prior art, the service life of a vehicle tire is short, and a vehicle slips. The rubber composition is prepared from 0 to 50 phr of cis-1, 4-polyisoprene rubber, 0 to 50 phr of general synthetic rubber of styrene-butadiene copolymer, 0 to 50 phr of hydrogenated nitrile rubber, 40 to 60 phr of carbon black, 0 to 20 phr of white carbon black, 3 to 6 phr of zinc oxide, 1 to 3 phr of stearic acid, 3 to 6 phr of anti-aging agent, 2 to 4 phr of protective wax, 0.8 to 2.0 phr of sulfur and 0.8 to 2.0 phr of accelerant. A small amount of added high-dispersion white carbon black is used for reinforcing, is dispersed on the surface of the tread and can pierce an oil film, so that the friction force between the tread and the ground is improved, and the gripping force of the tire on the greasy dirt ground is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of tire materials, in particular to an oil-resistant tire tread rubber material. Background Art

[0002] Since natural rubber has the best tear resistance and adhesion performance, and general synthetic rubber has high puncture resistance, the tire tread formula generally adopts a raw rubber system that uses natural rubber and general synthetic rubber. The ratio of natural rubber to general synthetic rubber in the current tread rubber formula is 10 / 90, the swelling index is 30%, and the oil swelling resistance is average. The oil swelling resistance is tested and measured by immersing a certain mass of sample in vegetable oil under certain temperature and time conditions, taking it out, drying it, and weighing it. The smaller the reported value, the higher the oil swelling resistance. Natural rubber and general synthetic rubber are widely used in tire treads to improve adhesion and puncture resistance, but at the same time it brings a negative effect, that is, poor oil swelling resistance.

[0003] In the working conditions of the oil industry, for example, the floor of the factory oil depot will be stained with oil after long-term operation and use. These oil stains usually come from various reasons such as careless operation of workers, oil leakage of mechanical equipment, cutting fluid, and lubricant overflow. These oil stains not only adhere to the ground, but also may penetrate into the tiny gaps in the ground. It is well known that the tires of vehicles operating in such workshops have a short service life and the phenomenon of vehicle slippage is very common, which seriously affects the safety of operations. With the development of the oil industry, people have put forward more stringent requirements on the oil resistance of tires, and the performance of conventional tire formulas cannot meet the requirements well.

[0004] Based on this, an oil-resistant tire tread rubber material is now provided to eliminate the drawbacks of the existing device. Summary of the invention

[0005] The purpose of the present invention is to provide an oil-resistant tire tread rubber material, which solves the problems of short service life of vehicle tires and vehicle slippage in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An oil-resistant tire tread rubber material comprises, by weight, 0-50 phr of cis-1,4-polyisoprene rubber, 0-50 phr of general synthetic rubber of styrene-butadiene copolymer and 0-50 phr of hydrogenated nitrile rubber, 40-60 phr of carbon black, 0-20 phr of white carbon black, 3-6 phr of zinc oxide, 1-3 phr of stearic acid, 3-6 phr of antioxidant, 2-4 phr of protective wax, 0.8-2.0 phr of sulfur and 0.8-2.0 phr of accelerator.

[0008] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0009] In an optional scheme: the general synthetic rubber has a glass transition temperature Tg between -50 and -20°C, and a styrene group content of 23.5wt%; the special rubber hydrogenated nitrile rubber has an acrylonitrile content of 18% to 45%, a double bond content of 0.8% to 6.0%, and a glass transition temperature Tg between -40°C and -20°C.

[0010] In an alternative embodiment, the general synthetic rubber is a copolymer of styrene-butadiene, has a glass transition temperature Tg between -50 and -20°C, and a styrene group content of 23.5 wt%.

[0011] In an optional solution, the hydrogenated nitrile rubber has an acrylonitrile content of 18% to 45%, a double bond content of 0.8% to 6.0%, and a glass transition temperature Tg between -40°C and -20°C. The main difference between hydrogenated nitrile rubber A and hydrogenated nitrile rubber B is the acrylonitrile content and the double bond content.

[0012] In one alternative: the carbon black is N220 or N234.

[0013] In an optional embodiment, the BET specific surface area of ​​white carbon black is 120 to 200 m2 / g, and the absorption value of dibutyl phthalate is 1.0 to 3.5 cm3 / g.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The small amount of highly dispersed white carbon black added in the present invention can be dispersed on the tread surface while reinforcing the tire, and can penetrate the oil film, thereby increasing the friction between the tread and the ground, and further improving the grip of the tire on the oily ground. DETAILED DESCRIPTION

[0016] 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 described embodiments 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.

[0017] Example 1

[0018] The rubber composition of the ingredients specified in Table 1 and Table 2 was prepared in a BR Banbury internal mixer. The preparation process adopted two separate feeding and mixing stages, namely a non-productive mixing stage and a productive mixing stage. The non-productive stage was mixed for about 2-3 minutes until the rubber temperature reached 160°C, which was completed. The mixing time of the productive stage was the time when the rubber temperature reached 115°C.

[0019] The rubber compositions are referred to herein as Sample 1, Sample 2, and Sample 3. Sample 1 is used herein as a control sample, that is, the rubber composition does not use the optimized rubber ratio.

[0020] All samples were cured at about 151°C for about 30 min. Table 2 shows the appearance and physical properties of cured samples 1-3;

[0021] Table 1

[0022] sample 1Comparison sample 2 3 Cis-1,4-polyisoprene rubber 10 30 70 Styrene-butadiene copolymer 90 40 Hydrogenated Nitrile Rubber A 30 30 Carbon Black N220 65 55 55 White Carbon Black 10 10 Aromatic oil 6 6 6 Sulfur powder oil 1.4 1.4 1.4 Accelerator 2 2 2 Zinc oxide, stearic acid, antioxidants, etc. 12.8 12.8 12.8

[0023] Table 2

[0024] 151℃*30min vulcanization 1 2 3 Swelling index / % 30 15 19 Adhesion strength / Mpa 24 34 68

[0025] Example 2

[0026] The rubber composition of the ingredients specified in Table 3 and Table 4 was prepared in a BR Banbury internal mixer. The preparation process adopted two separate feeding and mixing stages, i.e., a non-productive mixing stage and a productive mixing stage. The non-productive stages were mixed for about 2-3 minutes each until the rubber temperature reached 160°C, which was completed. The mixing time of the productive stage was the time when the rubber temperature reached 115°C.

[0027] The rubber compositions are referred to herein as sample a, sample b, sample c, and sample d. Sample a is used herein as a control sample, that is, the optimized filler amount is not used in the filler system.

[0028] All samples were cured at about 151°C for about 30 min. Table 4 shows the appearance and physical properties of the cured samples ad;

[0029] Table 3

[0030]

[0031] Table 4

[0032] 151℃*30min vulcanization a b c d Swelling index / % 30 21 14.9 12 Adhesion strength / Mpa 24 40 35 23

[0033] These results show that the swelling resistance and adhesion performance of the tread can be significantly improved by using hydrogenated nitrile rubber with excellent oil resistance in the tread rubber and optimizing the ratio of natural cis-1,4-polyisoprene rubber and styrene-butadiene copolymer.

[0034] Adhesion strength can be measured according to the tire industry acceptable peel strength test method. The higher the reported value, the higher the adhesion performance.

[0035] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-resistant tire tread rubber material, characterized in that: Contains: 0-50 phr cis-1,4-polyisoprene rubber, 0-50 phr general synthetic rubber of styrene-butadiene copolymer and 0-50 phr hydrogenated nitrile rubber, 40-60 phr carbon black, 0-20 phr white carbon black, 3-6 phr zinc oxide, 1-3 phr stearic acid, 3-6 phr antioxidant, 2-4 phr protective wax, 0.8-2.0 phr sulfur and 0.8-2.0 phr accelerator.

2. The oil-resistant tire tread rubber material according to claim 1, characterized in that: The general synthetic rubber has a glass transition temperature Tg between -50 and -20°C and a styrene group content of 23.5 wt%.

3. The oil-resistant tire tread rubber material according to claim 1, characterized in that: The acrylonitrile content of hydrogenated nitrile rubber is 18% to 45%, and the double bond content is 0.8% to 6.0%.

4. The oil-resistant tire tread rubber material according to claim 3, characterized in that: The glass transition temperature Tg of hydrogenated nitrile rubber is between -40℃ and -20℃.

5. The oil-resistant tire tread rubber material according to claim 1, characterized in that: The general synthetic rubber is a copolymer of styrene-butadiene, has a glass transition temperature Tg between -50 and -20°C, and has a styrene group content of 23.5 wt%.

6. The oil-resistant tire tread rubber material according to claim 1, characterized in that: The acrylonitrile content of hydrogenated nitrile rubber is 18% to 45%, the double bond content is 0.8% to 6.0%, and the glass transition temperature Tg is between -40°C and -20°C.

7. The oil-resistant tire tread rubber material according to claim 1, characterized in that: The carbon black is N220 or N234.

8. The oil-resistant tire tread rubber material according to claim 1, characterized in that: The BET specific surface area of ​​white carbon black is 120-200 m2 / g, and the absorption value of dibutyl phthalate is 1.0-3.5 cm3 / g.

9. A tire, characterized in that: The tire tread is made of the oil-resistant tire tread rubber material described in any one of claims 1 to 8.

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