Tire Tread Composition Using Peroxide Crosslinking
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Solution Overview
Problem
Tire treads face challenges in balancing rolling resistance, grip, wear, and processability, particularly due to the use of peroxide-based crosslinking systems which increase Mooney viscosity, making industrial implementation difficult.
Innovation Solution
A tire tread composition comprising a blend of polybutadiene-based diene elastomers with functional groups interacting with silica, styrene-butadiene copolymers, silica as a reinforcing filler, a coupling agent, and a plasticizing system with a peroxide crosslinking system, optimizing the balance between adhesion and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peroxide-based crosslinking system is used to improve adhesion and reduce rolling resistance, then wet and dry grip are improved, but Mooney viscosity increases making industrial implementation difficult
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking system by specifying particular peroxide compounds (dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane) and controlling their quantity (0.5-5 phr), along with adjusting processing temperature (140-180°C) and time (5-30 minutes) to achieve optimal balance between adhesion improvement and processability
Solution Approach 2:
The patent creates a composite rubber composition combining multiple elastomers (polybutadiene with vinyl content 10-30%, styrene-butadiene copolymer), silica filler (60-120 phr), and the peroxide crosslinking system, where the synergistic interaction of components achieves both improved adhesion and acceptable processability
2Reliability
If the quantity of silica and coupling agent is increased to improve adhesion, then wet and dry grip are enhanced, but the viscosity of raw compositions increases
Solution Approach 1:
The patent optimizes the ratio and quantity of silica (60-120 phr) and coupling agent (3-10 phr, specifically silane-based coupling agents like silane-triethoxysilane or silane-disulfide), along with processing conditions to achieve improved adhesion while controlling viscosity for industrial processability
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 improves adhesion on both wet and dry surfaces while maintaining or enhancing processability, as demonstrated by reduced Mooney viscosity and enhanced grip performance.
Implementation Method 1
a crosslinking system based on organic peroxide
Implementation Method 2
an elastomer based on polybutadiene, modified with a functional group capable of interacting with silica as a reinforcing filler
Data Source
AI summary
The invention relates to a tyre tread comprising a rubber composition based on at least 10 to 90 phr of a first diene elastomer, the first diene elastomer being an elastomer based on polybutadiene, modified with a functional group capable of interacting with silica as reinforcing filler, the first diene elastomer having a glass transition temperature of less than -80°C; from 10 to 90 phr of a second diene elastomer, the second diene elastomer being a styrene/butadiene copolymer having a glass transition temperature of greater than -80°C; from 90 to 150 phr of silica as reinforcing filler; a coupling agent; a plasticizing system comprising a plasticizing resin having a glass transition temperature of greater than 20°C; a crosslinking system based on organic peroxide; the total content of the first diene elastomer and of the second diene elastomer in the composition being within a range extending from 80 to 100 phr.