Tire Rubber Compound Balancing Conductivity and Rolling Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The tire industry faces a challenge in achieving low electrical resistance in tire tread portions without compromising rolling resistance, as existing solutions either lead to irregular wear or increased rolling resistance.
Innovation Solution
A rubber compound comprising a specific combination of carbon blacks with varying surface areas and an aromatic amide dispersant agent, which interacts with a cross-linkable polymer base, is used to achieve low electrical resistance without worsening rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the quantity of carbon black or surface area thereof is increased to ensure low electrical resistance, then electrical resistance is improved, but rolling resistance worsens
Solution Approach 1:
The patent applies parameter changes by carefully controlling the surface area parameters of two different carbon blacks (first carbon black: 10-170 m²/g, second carbon black: ≥300 m²/g) and their quantity ratio (5:1 to 13:1). This optimized parameter combination achieves low electrical resistance without excessive rolling resistance. Additionally, the dispersant agent quantity is controlled at 0.5-2.0 phr to optimize the dispersion state of carbon black particles, further refining the electrical conductivity while minimizing energy loss.
Solution Approach 2:
The patent employs composite materials by combining two distinct carbon black types with different surface area characteristics into a synergistic filler system. The first carbon black (lower surface area) provides structural framework, while the second carbon black (higher surface area) enhances conductivity. This composite approach, combined with aromatic amide dispersant, creates a multi-component system where each component contributes specific properties to achieve both low electrical resistance and acceptable rolling resistance.
2Reliability
If conductor elements are added to the tread portion to ensure low electrical resistance, then electrical resistance is improved, but tread preparation complexity and wear uniformity worsen
Solution Approach 1:
The patent merges the electrical conductivity function directly into the rubber compound matrix by incorporating carbon black fillers and dispersant agents during compound preparation. This integration eliminates the need for separate conductor elements and their associated installation processes. The conductivity is achieved through the compounded materials themselves, simplifying tread preparation while maintaining electrical resistance performance.
Solution Approach 2:
The carbon black filler system performs multiple functions simultaneously: it provides reinforcement to the rubber matrix, enables electrical conductivity, and maintains tread wear uniformity. The aromatic amide dispersant enhances the universality by improving the distribution and interaction of carbon black particles, allowing the same compound to achieve both mechanical durability and electrical functionality without additional components.
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 compound effectively reduces electrical resistance to acceptable levels while maintaining optimal rolling resistance, as demonstrated by specific examples showing improved performance over comparative compounds.
Implementation Method 1
a rubber compound for the production of tire portions comprising a polymer base with a cross-linkable unsaturated chain, a filler system and a vulcanization system; said compound being characterized in that said filler system comprises (a) a quantity, greater than or equal to 25 phr, of a first carbon black having a surface area smaller than or equal to 170 m2/gr; (b) a second carbon black having a surface area greater than or equal to 300 m2/gr
Data Source
AI summary
A rubber compound for the production of tire portions comprising a polymer base with a cross-linkable unsaturated chain, a filler system and a vulcanization system. The filler system comprises (a) a quantity, greater than or equal to 25 phr, of a first carbon black having a surface area smaller than or equal to 170 m2/gr; (b) a second carbon black having a surface area greater than or equal to 300 m2/gr in a quantity that is such that the ratio between the quantity of said first carbon black and the quantity of said second carbon black is greater than or equal to 5 and smaller than or equal to 13; (c) a quantity ranging between 0.5 and 2.0 phr of a dispersant agent comprised in the class of aromatic amides and having an unsaturation suited to interact with the polymer base with a cross-linkable unsaturated chain.