Tread Rubber Composition Using Hydrogenated Resin for Wet Grip
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Solution Overview
Problem
Current tire technologies face a challenge in achieving a high balance between wet gripping performance and fuel efficiency, with existing solutions not fully optimizing both aspects simultaneously.
Innovation Solution
A tire rubber composition comprising an isoprene skeleton rubber, modified styrene-butadiene rubber with a bound styrene content of 30% or more, hydrogenated resin with a softening point above 100°C and weight-average molecular weight between 1200 and 1600 g/mol, silica, and carbon black, where silica constitutes 50% or more of the silica and carbon black total mass, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber composition comprising natural rubber, thermoplastic resin, and silica is applied to improve wet gripping performance, then wet gripping performance is improved, but fuel efficiency cannot be sufficiently improved
Solution Approach 1:
The patent applies parameter changes by precisely controlling the weight-average molecular weight of the hydrogenated resin within 1200-1600 g/mol and setting the silica content to 50% or more of total filler. These specific parameter ranges optimize the balance between wet gripping performance and rolling resistance, resolving the contradiction between reliability and energy consumption.
Solution Approach 2:
The patent uses composite materials by combining hydrogenated resin with specific molecular weight characteristics, silica, and carbon black in defined proportions. This composite approach creates synergistic effects where the hydrogenated resin modifies the rubber matrix properties while silica provides reinforcement and low rolling resistance, achieving both improved wet gripping and fuel efficiency.
2Reliability
If silica content is increased to improve wet gripping performance, then wet gripping performance is improved, but rolling resistance may increase affecting fuel efficiency
Solution Approach 1:
The patent applies parameter changes by setting silica content to 50% or more of total filler while simultaneously controlling the hydrogenated resin molecular weight to 1200-1600 g/mol. This coordinated parameter optimization allows high silica content for wet gripping without excessive rolling resistance increase, as the specific molecular weight range of hydrogenated resin modifies the rubber-silica interface properties.
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
This composition enhances both wet gripping performance and fuel efficiency of tires by improving hysteresis loss control and reinforcement properties, resulting in a balanced performance.
Implementation Method 1
a hydrogenated resin having a softening point of higher than 100° C. and a weight-average molecular weight in terms of polystyrene (g/mol) of greater than 1200 and 1600 or less
Implementation Method 2
silica and carbon black, wherein a percentage of silica in the total amount of said silica and said carbon black is 50% by mass or more and less than 100% by mass
Implementation Method 3
a rubber component containing an isoprene skeleton rubber and a modified styrene-butadiene rubber with a bound styrene content of 30% by mass or more
Data Source
AI summary
The technical problem of this disclosure is to provide a tire rubber composition capable of achieving a high degree of compatibility between the wet gripping performance and the fuel efficiency of a tire. The solution is a tire rubber composition containing: a rubber component containing an isoprene skeleton rubber and a modified styrene-butadiene rubber with a bound styrene content of 30% by mass or more; a hydrogenated resin having a softening point of higher than 100° C. and a weight-average molecular weight in terms of polystyrene (g/mol) of greater than 1200 and 1600 or less; silica; and carbon black, wherein a percentage of silica in the total amount of said silica and said carbon black is 50% by mass or more and less than 100% by mass.