Tire Tread Rubber Composition Silane Coupling Agent Dispersion
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Solution Overview
Problem
Current rubber compositions for tire treads, despite using silica and silane coupling agents, fail to achieve a balance between reduced heat generation and improved wear resistance, which are essential performance requirements for tires, especially on wet road surfaces.
Innovation Solution
A rubber composition incorporating a modified conjugated diene-based polymer with a specific structure, silica, carbon black, and a silane coupling agent, where the polymer is produced by copolymerizing a conjugated diene-based monomer and an aromatic vinyl monomer in a hydrocarbon solvent using an active organometallic compound, and the silane coupling agent interacts with the polymer to enhance silica dispersibility and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If wet silica is used as a filler to reduce heat generation and improve wet road grip, then heat generation is reduced and wet grip is improved, but silica particles aggregate due to hydrogen bonding between silanol groups, deteriorating dispersion and wear resistance
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between wet silica particles and the rubber matrix. The silane coupling agent contains both hydrolyzable alkoxy groups that bond with silica surface hydroxyl groups and organic functional groups that interact with the rubber polymer, thereby preventing silica particle aggregation and improving dispersion without sacrificing the heat reduction and wet grip benefits of wet silica
Solution Approach 2:
The invention creates a composite material system consisting of wet silica, silane coupling agent, and rubber polymer. The silane coupling agent forms a bridging layer that combines the inorganic silica particles with the organic rubber matrix, achieving synergistic effects that simultaneously reduce heat generation, improve dispersion, and enhance wear resistance
2Temperature
If wet silica is used to achieve balance between heat generation and wet grip, then heat generation is reduced and wet grip is improved, but kneading time must be lengthened to improve silica dispersion and avoid decrease in wear resistance
Solution Approach 1:
The silane coupling agent acts as a dispersing intermediary that reduces the energy and time required for kneading. By forming stable bonds with silica particles and the rubber matrix, it prevents aggregation during mixing, allowing for effective dispersion with reduced kneading time while maintaining wear resistance and heat generation performance
3Stability of the object's composition
If only silica and silane coupling agent are combined, then dispersion is improved, but a good balance between reduction in heat generation and wear resistance cannot be achieved
Solution Approach 1:
The invention formulates a composite rubber composition that integrates wet silica, silane coupling agent, and specific rubber polymers in optimized proportions. This composite system achieves synergistic effects where the silane coupling agent bridges silica and rubber, simultaneously optimizing heat generation reduction, wear resistance, and dispersion stability that cannot be achieved by simply combining silica and silane coupling agent alone
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 significantly reduces heat generation and improves wear resistance, leading to enhanced steering stability and rolling resistance, surpassing conventional tire performance levels.
Implementation Method 1
a silane coupling agent having a specific structure... in which the silane coupling agent interacts with the polymer to enhance silica dispersibility and bonding
Implementation Method 2
copolymerizing a conjugated diene-based monomer and an aromatic vinyl monomer in a hydrocarbon solvent using an active organometallic compound
Implementation Method 3
using an active organometallic compound as an initiator
Implementation Method 4
the terminal modifying group carried by the terminal modifying group-containing conjugated diene-based copolymer contains a functional group which interacts with the silica
Data Source
AI summary
A rubber composition for tire tread contains a diene-based rubber including 30 wt % or more of a terminal modifying group-containing conjugated diene-based copolymer, silica, carbon black, and at least one of silane coupling agents represented by specified formulae. The total amount of silica and carbon black in the composition is 35 to 140 parts by weight relative to 100 parts by weight of the diene-based rubber, while the silane coupling agent content is 4 to 18 wt % on the silica content. The copolymer is produced by a specified method such that the aromatic vinyl monomer content in the copolymer is 38 to 48 wt %, the vinyl unit content in all the conjugated diene-based monomers is 20 to 35 mol %, the weight average molecular weight of the copolymer is 600,000 to 1,000,000, and the terminal modifying group in the copolymer contains a functional group which interacts with the silica.