A high abrasion, tear resistant passenger tire tread rubber composition and method of making and tire

Abstract

This invention relates to the field of new tire materials technology, and more particularly to a high-wear-resistant and tear-resistant passenger car tire tread rubber composition, its preparation method, and the tire thereof. The composition, based on 100 parts by weight of the rubber phase, comprises a blend of low molecular weight end-functionalized solution-polymerized styrene-butadiene rubber and high cis-high molecular weight polybutadiene, supplemented with silica, silane coupling agent, tackifying resin, and a small amount of carbon black for reinforcement. Through a mixing process of "high-temperature silanization masterbatch—low-temperature addition of high molecular weight rubber—low-shear peak retention," the rubber phase forms and maintains a distinct bimodal molecular weight distribution, thereby significantly improving crack propagation resistance and anti-sharding durability while maintaining wear resistance and low heat generation. Examples show that the obtained vulcanizate exhibits a tear resistance index meeting a predetermined threshold, with stable improvement in abrasion performance, making it suitable for high-load and complex road conditions, such as in electric vehicles.

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