Tire Rubber Composition Dry Wet Grip Low Rolling Resistance
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Solution Overview
Problem
Pneumatic tires face challenges in achieving both dry grip performance and wet grip performance on race tracks while also requiring low rolling resistance for ordinary roads, as existing tire rubber compositions either excel in grip but fail in rolling resistance or vice versa.
Innovation Solution
A tire rubber composition is developed by compounding silica, carbon black, and a hydrocarbon resin with specific properties, including a styrene-butadiene rubber with defined styrene content, glass transition temperature, and molecular weight, along with a silane coupling agent and thiuram-based vulcanization accelerator, to balance dry and wet grip with low rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional tire rubber compositions use high carbon black content for dry grip performance, then steering stability and dry grip improve, but rolling resistance increases and fuel economy deteriorates
Solution Approach 1:
The patent changes the parameters of carbon black by specifying a nitrogen adsorption specific surface area of 250-450 m²/g and using 80-150 parts by weight, which optimizes the balance between grip performance and rolling resistance through precise control of filler surface area and quantity
Solution Approach 2:
The patent creates a composite rubber composition combining diene rubber (100 parts) with specific carbon black (80-150 parts) having controlled surface area, forming a multi-component system that achieves both high dry grip and low rolling resistance through synergistic material interactions
2Reliability
If tire rubber composition is optimized for race track performance with high grip, then steering stability and wet performance improve, but wear resistance and low rolling resistance required for ordinary roads deteriorate
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: carbon black surface area (250-450 m²/g), carbon black quantity (80-150 parts), and diene rubber composition, creating a balanced formulation that achieves steering stability, wet performance, and wear resistance without compromising low rolling resistance
Solution Approach 2:
The patent creates a universal tire rubber composition that can perform multiple functions: providing dry grip, wet grip, steering stability, and wear resistance simultaneously, making the tire suitable for both race track and ordinary road conditions
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 composition achieves excellent dry and wet grip performance on race tracks and low rolling resistance on ordinary roads, enhancing fuel economy and compliance with environmental regulations.
Implementation Method 1
it has become common knowledge that rolling resistance can be reduced by compounding a silane coupling agent and silica
Implementation Method 2
a tire rubber composition which comprises 100 parts by weight of a diene rubber, 80 to 150 parts by weight of carbon black having a nitrogen adsorption specific surface area of 250 to 450 m 2
Data Source
Figure 1
AI summary
Provided is a tire rubber composition which achieves both dry grip performance and wet grip performance when traveling on race tracks as well as low rolling resistance when traveling on ordinary roads. The tire rubber composition of the present invention is produced by compounding from 1 to 50 parts by mass of silica, carbon black in an amount not less than the amount of silica, and from 10 to 30 parts by mass of a hydrocarbon resin having a softening point from 100 to 140°C with 100 parts by mass of a diene rubber containing not less than 5 mass% and less than 30 mass% of a styrene-butadiene rubber, wherein the styrene-butadiene rubber has a styrene content from 30 to 40 mass%, a glass transition temperature from -20 to -5°C, and a weight average molecular weight from 1000000 to 1800000; a nitrogen adsorption specific surface area of the carbon black is from 200 to 400 m2/g; and a nitrogen adsorption specific surface area of the carbon black is greater than a nitrogen adsorption specific surface area of the silica.