Rubber Composition Carbon Black Abrasion Heat Build-up
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Solution Overview
Problem
Current rubber compositions for pneumatic tires face a trade-off between abrasion resistance and low heat build-up properties, with carbon blacks that improve one property often compromising the other, and no carbon black has been found to adequately address both requirements simultaneously.
Innovation Solution
A rubber composition incorporating a carbon black with specific aggregate properties, such as a mode diameter not greater than 79 nm, a ΔD50/Dmod ratio of at least 0.90, and a cetyltrimethylammonium bromide adsorption specific surface area of 105 to 135 m²/g, produced from a feedstock oil with specific characteristics, is used to achieve both abrasion resistance and low heat build-up properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black with high specific surface area or high structure is used to improve abrasion resistance, then abrasion resistance is improved, but low heat build-up properties deteriorate
Solution Approach 1:
The invention changes the parameters of carbon black from conventional specifications (high specific surface area, high structure) to specific aggregate diameter parameters (D50 of 60-120 nm, Dst of 20-80 nm, ΔD50/Dst ratio of 0.60-1.50). This parameter transformation allows achieving both high abrasion resistance and low heat build-up by optimizing the aggregate diameter distribution rather than relying on specific surface area or structure alone.
2Strength
If the aggregate diameter distribution of carbon black is sharpened to improve abrasion resistance, then abrasion resistance is improved, but low heat build-up properties deteriorate
Solution Approach 1:
The invention transforms the approach from controlling sharpness of aggregate diameter distribution to controlling the specific range and ratio parameters. By specifying D50 between 60-120 nm, Dst between 20-80 nm, and maintaining a ΔD50/Dst ratio of 0.60-1.50, the invention achieves optimal balance between abrasion resistance and heat build-up properties through quantitative parameter control rather than qualitative sharpness control.
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 effectively enhances both abrasion resistance and low heat build-up properties, resulting in tires with improved performance in both areas.
Implementation Method 1
a cetyltrimethylammonium bromide adsorption specific surface area (CTAB) of 105 to 135 m2/g
Data Source
AI summary
The present invention provides rubber compositions that can achieve both abrasion resistance and low heat build-up properties, and pneumatic tires including such rubber compositions. The present invention relates to a rubber composition containing one or more carbon blacks, at least one of which is produced from a feedstock oil that has a BMCI value of not greater than 150 and an aliphatic hydrocarbon content of not less than 30% by mass.