Three-Layer Elastomer Laminate for Tire Tread Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The adhesion between weakly unsaturated and highly unsaturated diene rubber compositions in tire tread and underlayment layers is insufficient, leading to potential separation issues during the tire's lifespan.
Innovation Solution
A three-layer elastomeric laminate is introduced, with a diene rubber composition acting as a bonding gum between the two compositions, comprising a first layer with a weakly unsaturated elastomer matrix, a second layer with a terpolymer of ethylene, α-olefin, and non-conjugated diene having more than 10% diene units, and a third layer with a highly unsaturated diene elastomer, enhancing interlayer adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bonding gum layer is introduced between the tread and underlayment, then interlayer adhesion is improved, but the device complexity increases due to the additional layer
Solution Approach 1:
The patent introduces a bonding gum layer (second diene rubber composition) as an intermediary between the tread composition (first diene rubber composition) and underlayment composition (third diene rubber composition). This intermediate layer acts as a mediator that enhances adhesion between the two compositions by providing compatible chemical groups for crosslinking with both adjacent layers, thereby resolving the adhesion problem without compromising structural integrity.
Solution Approach 2:
The patent creates a composite laminate structure consisting of three distinct diene rubber composition layers with different properties. The first layer (tread) contains weakly unsaturated elastomer, the second layer (bonding gum) contains highly unsaturated elastomer, and the third layer (underlayment) contains very highly unsaturated elastomer. This composite structure leverages the complementary properties of each layer to achieve superior overall adhesion and performance.
2Reliability
If the diene content in the intermediate layer is increased to improve bonding, then the adhesion between layers is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent systematically varies the diene content parameter across the three layers to optimize bonding. The first layer has low diene content (weakly unsaturated), the second layer has high diene content (highly unsaturated for maximum bonding capability), and the third layer has very high diene content (very highly unsaturated). This gradient parameter change allows each layer to perform its specific function while maintaining controllable manufacturing parameters through well-defined composition ranges.
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 laminate significantly improves the resistance to layer separation, ensuring strong adhesion and durability of the tire components, particularly between the tread and underlayment layers.
Implementation Method 1
the underlayer generally adheres to the tread through physical or chemical phenomena, such as the phenomena of interpenetration, entanglement or crosslinking of the diene rubber compositions constituting respectively the tread and the underlayment to the tread
Implementation Method 2
the underlayer generally adheres to the tread through physical or chemical phenomena, such as the phenomena of interpenetration, entanglement or crosslinking of the diene rubber compositions
Implementation Method 3
the underlayer generally adheres to the tread through physical or chemical phenomena, such as the phenomena of interpenetration, entanglement or crosslinking of the diene rubber compositions
Data Source
AI summary
The invention relates to an elastomer laminate comprising three layers, the first layer consisting of a diene rubber composition comprising a first elastomer matrix; the second layer consisting of a diene rubber composition comprising a second elastomer matrix, which second elastomer matrix comprises a second ethylene terpolymer elastomer consisting of an α-olefin and an unconjugated diene and containing more than 10% by mass diene units; the third layer consisting of a diene rubber composition comprising a third diene elastomer with a diene unit mass rate greater than 50%, the second layer being disposed between the first layer and the third layer. A laminate of this type has good resistance to separation of its constituent layers.