Farnesene Polymer Rubber Composition for Ice Performance
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Solution Overview
Problem
Current rubber compositions for tires, such as winter and all-season tires, do not adequately address performance on ice, despite advancements in materials like specific resins and carbon blacks.
Innovation Solution
A rubber composition incorporating a farnesene polymer and a carbon black with specific surface area and adsorption properties, combined with isoprene-based and polybutadiene rubbers, to enhance ice performance by improving dispersibility and fracture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional rubber compositions with specific resins and carbon blacks are used, then low temperature properties are improved, but performance on ice remains insufficient
Solution Approach 1:
The invention changes the chemical composition parameters by introducing a farnesene polymer with specific molecular structure and properties. The farnesene polymer content is controlled at 5-50 parts by mass per 100 parts by mass of rubber component, and the carbon black is selected with specific CTAB surface area (140-160 m²/g). These parameter changes enable the rubber composition to achieve both low temperature flexibility and ice performance through optimized molecular interactions and dispersibility.
2Strength
If highly filled carbon black is used to improve fracture resistance, then strength is improved, but dispersibility deteriorates
Solution Approach 1:
The farnesene polymer acts as an intermediary substance between the rubber component and carbon black. It has specific chemical structure features (terminal double bonds, specific molecular weight range) that enable it to interact with both the rubber matrix and carbon black surface, improving the dispersibility of highly filled carbon black while maintaining fracture resistance. The intermediary effect is achieved through controlled molecular interactions without requiring additional processing steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The rubber composition demonstrates improved performance on ice, including better fracture resistance and abrasion resistance, with the farnesene polymer enhancing carbon black dispersibility and lowering complex modulus at 0°C, resulting in enhanced tire performance in cold conditions.
Implementation Method 1
the farnesene polymer improves the dispersibility of the carbon black
Implementation Method 2
a carbon black having a cetyltrimethylammonium bromide adsorption specific surface area of 140 m²/g or more
Data Source
AI summary
The present invention provides a rubber composition for tires which is excellent in performance on ice, and a pneumatic tire formed from the rubber composition. Included is a rubber composition for tires, containing: a rubber component; a farnesene polymer; and a carbon black having a cetyltrimethylammonium bromide adsorption specific surface area of 140 m2/g or more and a ratio (CTAB/IA) of the cetyltrimethylammonium bromide adsorption specific surface area (CTAB) to an iodine adsorption number (IA) of 1.10 or higher.