Tear-resistant tire carcass rubber composition

Abstract

The invention relates to a tear-resistant tire carcass rubber composition. The rubber composition provided by the invention comprises the following components in parts by weight: 60-90 parts of natural rubber; 10-40 parts of styrene butadiene rubber; 30 to 70 parts of a reinforcing agent; 2-6 parts of zinc oxide; 1-3 parts of stearic acid; 1.5 to 5 parts of an anti-aging agent; 1 to 5 parts of resorcinol; 2 to 6 parts of RA-65; 2-8 parts of a plasticizer; 2 to 5 parts of insoluble sulfur; 1 to 2 parts of N-tert-butyl-2-benzothiazole sulfenamide, and 1 to 2 parts of a catalyst; and 0.1 to 1 part of 2, 2 '-dithiobis (benzothiazole). The tire carcass rubber composition has the beneficial effects that the prepared tire carcass rubber composition has good tear resistance, tensile property, rebound resilience, fatigue heat generation resistance, flex cracking resistance, adhesive property and the like, and can meet the requirements of rubber products.

Description

Technical Field

[0001] The present invention belongs to the field of rubber, and particularly relates to a tear-resistant tire carcass rubber composition. Background Art

[0002] Tires are the main components of automobiles, affecting the handling stability, safety, and comfort of automobiles, etc. Tires mainly consist of tread, shoulder, sidewall, and carcass, etc.

[0003] The carcass is the main structural part of the tire. It not only bears part of the tire stress but also has the functions of buffering and stabilizing the size. It is required to have good mechanical properties, elasticity, adhesion properties, flex fatigue resistance, and low heat generation, etc. The carcass is usually composed of a rubber composition and fiber cord. Common rubbers used for the carcass mainly include natural rubber and synthetic rubber, and the properties of the rubber compound are adjusted by adding rubber additives such as carbon black, reinforcing agent, plasticizer, antioxidant, vulcanizing agent, activator, accelerator, etc., so that the rubber composition can achieve better properties.

[0004] The purpose of the present invention is to provide a tear-resistant tire carcass rubber composition, which has good mechanical properties, resilience properties, fatigue heat resistance properties, flex cracking resistance properties, and adhesion properties, etc. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a tear-resistant tire carcass rubber composition.

[0006] A tear-resistant tire carcass rubber composition, the rubber composition contains the following components in parts by weight: 60 - 90 parts of natural rubber; 10 - 40 parts of styrene-butadiene rubber; 30 - 70 parts of reinforcing agent; 2 - 6 parts of zinc oxide; 1 - 3 parts of stearic acid; 1.5 - 5 parts of antioxidant; 1 - 5 parts of resorcinol; 2 - 6 parts of RA-65; 2 - 8 parts of plasticizer; 2 - 5 parts of insoluble sulfur; 1 - 2 parts of N-tert-butyl-2-benzothiazole sulfenamide; 0.1 - 1 part of 2,2'-dithiobenzothiazole.

[0007] According to an embodiment of the present invention, the reinforcing agent is one or more of N200 series carbon black, N300 series carbon black, and white carbon black used in combination.

[0008] According to an embodiment of the present invention, the plasticizer is 5-(2-methylpropenyl)-2-anilinophenol.

[0009] According to an embodiment of the present invention, the antioxidant contains the following components in parts by weight: 0.5 - 2 parts of p-phenylenediamine antioxidant; 0.5 - 1.5 parts of dihydroquinoline antioxidant; 0.5 - 1.5 parts of physical antioxidant.

[0010] In the technical solution of the present invention, the plasticizer 5-(2-methylpropenyl)-2-anilinophenol has two benzene rings in its molecular structure. Compared with common plasticizers such as aromatic oil and naphthenic oil, it can improve the tear resistance of the rubber composition. Moreover, it is a by-product of industrial products obtained through modification and has a relatively low price, which can reduce the cost of rubber products.

[0011] The beneficial effects of the present invention are that the prepared tire carcass rubber composition has good tear resistance, tensile properties, resilience properties, fatigue heat generation resistance, flex cracking resistance, adhesion properties, etc., and can meet the requirements of rubber products. Specific embodiments

[0012] The following combines examples to further describe in detail the specific embodiments of the present invention. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention. The experimental methods without specific conditions noted in the following examples are usually carried out under conventional conditions.

[0013] The present invention adopts a two-stage mixing process to mix the rubber composition for the comparative example and the examples; (1) The first stage uses a Banbury mixer for mixing. The initial temperature is 80°C, the rotation speed is 80 revolutions per minute, the discharge temperature is not higher than 160°C, and the mixing sequence is raw rubber for 1 min → stearic acid, zinc oxide, antioxidant, resorcinol for 1.5 min → carbon black, plasticizer for 3.5 min → cleaning for 1.5 min → discharging; (2) The second stage uses an open mill for mixing. The masterbatch from the first stage is added with RA-65, sulfur, and accelerator, and is passed thinly 6-8 times and then sheeted off.

[0014] Specimen preparation: The mixed rubber is parked for more than 16 h, and the specimens are vulcanized on a flat vulcanizer according to the required specimen size, temperature, pressure, and time.

[0015] The comparative example and the examples are mixed according to the above mixing process, and specimen preparation and related property tests are carried out.

[0016] Formulations of the comparative example and the examples

[0017] Properties of vulcanized rubber: From the experimental conclusions, it can be seen that Tensile strength: Example 1 > Example 2 > Comparative example; Elongation at break: Example 2 > Example 1 > Comparative example; Tear strength: Example 1 > Example 2 > Comparative example; Rebound performance: Example 2 > Example 1 > Comparative Example; Compression fatigue temperature rise: Comparative Example > Example 2 > Example 1. The higher the compression fatigue temperature rise, the poorer the fatigue heat resistance performance; Adhesion strength between vulcanizate and polyester cord: Example 1 > Example 2 > Comparative Example. The test results show that after adding the plasticizer 5-(2-methylallyl)-2-anilinophenol, the tensile properties, tear resistance, rebound performance, fatigue heat resistance performance of the rubber composition, and the adhesion strength between the vulcanizate and the polyester cord are all improved.

Claims

1. An anti-tear tire carcass rubber composition, characterized in that, the rubber composition comprises the following components in parts by weight: 60-90 parts of natural rubber; 10-40 parts of styrene-butadiene rubber; 30-70 parts of reinforcing agent; 2-6 parts of zinc oxide; 1-3 parts of stearic acid; 1.5-5 parts of antioxidant; 1-5 parts of resorcinol; 2-6 parts of RA-65; 2-8 parts of plasticizer; 2-5 parts of insoluble sulfur; 1-2 parts of N-tert-butyl-2-benzothiazole sulfenamide; 0.1-1 part of 2,2'-dithiobisbenzothiazole; the reinforcing agent is one or more of N200 series carbon black, N300 series carbon black and silica used in combination.

2. The rubber composition according to claim 1, characterized in that: the plasticizer is 5-(2-methylallyl)-2-anilinophenol.

3. The rubber composition according to claim 1, characterized in that: the antioxidant comprises the following components in parts by weight: 0.5-2 parts of p-phenylenediamine antioxidant; 0.5-1.5 parts of dihydroquinoline antioxidant; 0.5-1.5 parts of physical antioxidant.

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