Sidewall rubber composition resistant to early wax spraying in high humidity and heat environment and preparation method thereof

Abstract

The invention belongs to the field of rubber compound production for all-steel radial tires, in particular to a sidewall rubber composition resistant to early wax spraying in a high-humidity-heat environment and a preparation method thereof. The rubber composition comprises the following raw materials in parts by weight: 60-40 parts of natural rubber, 40-60 parts of high cis-butadiene rubber, 40-55 parts of carbon black, 3.0-5.5 parts of zinc oxide, and 1.5-3.0 parts of stearic acid , 0.5-1.5 parts of antioxidant RD, 1.5-3.0 parts of antioxidant 4020, 3.0-5.0 parts of environmentally friendly aromatic oil, 3.0-5.0 parts of tackifying resin, 1.5-3.0 parts of insoluble sulfur, 0.8-1.5 parts of accelerator NS, modified 1.5 to 2.5 copies of protective wax. The invention selects appropriate formula materials and components, and adopts a new type of modified protective wax HG72, so as to achieve the purpose of anti-early blooming and long-term protection of tires under high humidity and heat environment.

Description

technical field [0001] The invention relates to the field of rubber compound production for all-steel radial tires, in particular to a sidewall rubber composition resistant to early wax spraying in a high-humidity environment and a preparation method thereof. Background technique [0002] Tires will be in contact with trace amounts of ozone contained in the air during daily use. Ozone molecules can react with the double bonds in diene rubber molecules to form broken bonds, which will cause aging cracks in the rubber and continue to develop in depth, resulting in rubber The damage of the product makes it lose its use value prematurely. In order to avoid the damage of ozone to the tire sidewall rubber, people usually add a certain amount of protective wax to the sidewall rubber composition to protect the rubber against static ozone attack by migrating the wax to the tire rubber surface to form a film or physical barrier. With the use of the tire, the wax in the rubber continu...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of early blooming on the tire surface under the high humidity and heat environment existing in the prior art, and propose a sidewall rubber composition and preparation method thereof which are resistant to early blooming under the high humidity and heat environment. Formula raw materials and components, and adopt a new type of modified protective wax HG72 to achieve the purpose of anti-early wax spraying and long-term protection in high-humidity environment, suitable for high-temperature and high-humidity (temperature ≥ 35 ℃, humidity ≥ 60%) environment It effectively guarantees the long-term ozone resistance of the tire, and can avoid the early wax spraying of the finished tire, which plays a long-term protection role

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