Tire Rubber Composition Silica Dispersion and Wear Balance
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Solution Overview
Problem
Conventional rubber compositions for tires face challenges in achieving a balance between low rolling resistance, wet grip performance, and wear resistance, with silica aggregation and poor dispersibility leading to insufficient reinforcing effects and wear resistance.
Innovation Solution
A rubber composition comprising terminal-modified butadiene rubber, aromatic modified terpene resin, and specific types of silica (X and Y) with optimized surface areas and functional groups, ensuring high silica dispersibility and a silica-to-filler ratio of 85% or greater, enhancing low rolling resistance, wet grip performance, and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is blended in rubber composition to enhance low rolling resistance and wet grip performance, then low rolling resistance and wet grip performance are improved, but silica aggregates due to surface silanol groups and exhibits poor affinity for diene rubber, resulting in poor dispersibility and insufficient wear resistance
Solution Approach 1:
The patent uses a silane coupling agent as an intermediary substance between silica and diene rubber. The silane coupling agent reacts with surface silanol groups of silica to form a bridging layer that improves compatibility with the rubber matrix, preventing silica aggregation while maintaining the desired low rolling resistance and wet grip performance without sacrificing wear resistance
Solution Approach 2:
The patent optimizes the surface area parameter of silica particles by selecting specific silica types with controlled surface areas. This parameter change affects the balance between dispersibility, reinforcing effect, and wear resistance, allowing simultaneous achievement of low rolling resistance, wet grip performance, and wear resistance through precise surface area selection
2Reliability
If silica is used to improve low rolling resistance and wet grip performance, then these performances are enhanced, but the reinforcing effects of silica are lower than carbon black and wear resistance is insufficient
Solution Approach 1:
The patent creates a composite material system combining silica, silane coupling agent, and diene rubber in specific proportions. This composite approach leverages the advantages of silica for low rolling resistance and wet grip while the silane coupling agent provides reinforcing effects comparable to carbon black, achieving wear resistance without sacrificing the performance benefits of silica
Solution Approach 2:
The patent adjusts the surface area parameter of silica particles to optimize the balance between reinforcing effect and wet grip performance. By selecting silica with specific surface area ranges, the patent achieves both high reinforcing effect for wear resistance and appropriate wet grip performance
3Reliability
If silica dispersibility is poor, then low rolling resistance and wet grip performance cannot be achieved, but wear resistance is further lowered
Solution Approach 1:
The silane coupling agent acts as a mediator that improves silica dispersibility by reducing surface silanol group interactions. This enhanced dispersibility enables proper distribution of silica throughout the rubber matrix, achieving low rolling resistance and wet grip performance while the uniform distribution also maintains wear resistance
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 significantly improves low rolling resistance, wet grip performance, and wear resistance beyond conventional levels, achieving grade A wet grip performance and extended tire life.
Implementation Method 1
silane coupling agent which reacts with a silane group on a surface of the silica
Implementation Method 2
an aromatic modified terpene resin having a softening point of 100 to 130° C., and a functional group having reactivity with a silanol group
Data Source
AI summary
A rubber composition for tires comprises: per 100 parts by weight of diene rubber containing from 5 to 50 wt. % of modified BR having a vinyl unit content of 10 to 60 wt. %, from 2 to 50 parts by weight of an aromatic modified terpene resin having a softening point of 100 to 130° C., and a total content of 60 to 130 parts by weight of two types of silica, that is silica X and silica Y; a proportion of the silica relative to a total amount of a reinforcing filler containing carbon black being 85 wt. % or greater; a nitrogen adsorption specific surface area of the silica X is 140 m2/g or greater; and a nitrogen adsorption specific surface area of the silica Y is greater than 100 m2/g and less than 140 m2/g.