Elastomeric Laminate Gradient Bonding Layer
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Solution Overview
Problem
The adhesion between tire tread and tread underlayer compositions with differing degrees of unsaturation is insufficient, leading to potential detachment during the tire's lifespan.
Innovation Solution
An elastomeric laminate with multiple layers of diene rubber compositions is used, where a bonding rubber layer is interposed between the tread and tread underlayer, comprising diene elastomers with varying diene unit content to enhance adhesive bonding and resistance to separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bonding rubber layer is interposed between the tread and tread underlayer, then adhesive bonding is enhanced and resistance to separation is improved, but the structure complexity increases due to additional layers
Solution Approach 1:
A bonding rubber layer comprising diene elastomers with varying diene unit content is introduced as an intermediary between the tread layer and tread underlayer. This intermediate layer facilitates adhesive bonding by providing compatible chemical interactions with both adjacent layers, thereby resolving the adhesion problem without requiring fundamental changes to the existing tire structure.
Solution Approach 2:
The bonding rubber layer exhibits local quality variation through different diene elastomer compositions at different positions within the layer. The diene elastomer content varies from 50-100 phr in the region adjacent to the tread to 10-50 phr in the region adjacent to the tread underlayer, creating locally optimized bonding characteristics for each interface.
2Reliability
If multiple layers with varying diene elastomer content are used, then adhesive bonding is significantly improved, but the manufacturing complexity increases
Solution Approach 1:
The invention applies parameter changes by varying the diene elastomer content (expressed in phr) across different regions of the bonding rubber layer. Specifically, the diene elastomer content transitions from 50-100 phr near the tread to 10-50 phr near the tread underlayer, creating a gradient structure that optimizes adhesive bonding while maintaining manufacturability through controlled compositional variation.
3Reliability
If the tread underlayer is separated from the tread by bonding rubber, then adhesion between differing rubber compositions is improved, but the direct contact and potential interpenetration is reduced
Solution Approach 1:
The bonding rubber layer functions as a composite material system comprising multiple diene elastomers with different diene unit contents. This composite structure combines the advantages of both high diene content (for adhesion to tread) and low diene content (for compatibility with tread underlayer), creating a gradient composite that optimizes interfacial bonding while maintaining overall structural integrity.
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 separation of the layers by enhancing adhesive bonding, ensuring the tire's integrity throughout its life.
Implementation Method 1
The underlayer generally adheres to the tread by means of physical or chemical phenomena, such as phenomena of interpenetration, entanglement or crosslinking of the diene rubber compositions constituting the tread and the tread underlayer, respectively.
Implementation Method 2
The underlayer generally adheres to the tread by means of physical or chemical phenomena, such as phenomena of interpenetration, entanglement or crosslinking of the diene rubber compositions constituting the tread and the tread underlayer, respectively.
Implementation Method 3
The underlayer generally adheres to the tread by means of physical or chemical phenomena, such as phenomena of interpenetration, entanglement or crosslinking of the diene rubber compositions constituting the tread and the tread underlayer, respectively.
Data Source
AI summary
An elastomeric laminate is provided. The elastomeric laminate comprises a layer A consisting of a diene rubber composition, a layer B comprising a highly unsaturated diene elastomer B, n layers Ci arranged between the layer A and the layer B, n being an integer ≥2, i being an integer ranging from 1 to n, the layer C1 being arranged between the layer A and the layer C2, the layer Cn being arranged between the layer B and the layer Cn−1, the layer Ci being arranged between the layer Ci−1 and the layer Ci+1 for values of i ranging from 2 to n−1 when n>2. Such a laminate has good resistance to separation of the layers which constitute it.