The Benefits of Using silica silane

Application for Silica/Silane Systems in Passenger Car Tires (PCT)

In the contemporary tire industry, industrial carbon black is increasingly being replaced by the advanced silica/silane system. The synergy between precipitated silica and silanes creates a high-performance filler, providing excellent grip even during wet weather conditions. While polar silica does not naturally blend with non-polar polymers, bifunctional organosilanes bridge this gap by coupling silica to the polymer. Available in both liquid (e.g., Si 69®) and solid forms (e.g., X 50-S®), these organosilanes ensure enhanced compatibility. Additionally, products that pre-react silica with silanes, such as the COUPSIL® line, are particularly beneficial for the mechanical rubber goods (MRG) market.

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The Benefits of Using Silica Silane

The chemical bonding of silicas to polymers is pivotal for the durability and performance of green tires. The silica/silane system not only reduces rolling resistance but also enhances wet grip and abrasion properties, outperforming conventional carbon black systems. Utilizing appropriate combinations of silica and silane expands the performance triangle, resulting in safer and more sustainable tires.

Evonik has introduced a new generation of silanes designed to further improve tire performance. These advanced silanes offer ultra-low rolling resistance and significant fuel savings.

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The Benefits of Silica Filler While Minimizing the Processing ...

During a silanization reaction, silanes chemically bond with silica during mixing and subsequently attach to rubber during vulcanization. This process significantly enhances filler-to-rubber interaction. The degree of silanization achieved during mixing is crucial for controlling processing quality, rubber reinforcement, and other compound properties.

Authors Chenchy J. Lin, W. Michael York, and Russell J. Cody have developed a reliable method to quantify silanization using a Premier RPA (Rubber Process Analyzer) from Alpha Technologies. According to their paper, they proposed measuring a silane's capability to suppress silica filler network formation and correlating these measurements to the resultant compound properties, suggesting a practical approach for typical tire plants.

They evaluated three types of silane coupling agents and adapted test methods for quality control on the shop floor. By making it user-friendly, they established a test that can be conducted at each mixing stage. The test sequence involves sample conditioning and storage modulus determination before and after conditioning. The difference in storage modulus after various mixing stages calculates the degree of silanization.

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