Silanized Polyether Adhesive for Tire Foam Damping
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Solution Overview
Problem
Existing tire technologies face challenges in securely and permanently fixing noise-damping foam strips inside tires due to the presence of release agents, which affect adhesive bonding, especially under high temperature and humidity conditions, leading to audible cavity noises during vehicle operation.
Innovation Solution
The use of a silanized polyether-based adhesive layer, which is solvent- and isocyanate-free, improves the fixation of the foam strip by crosslinking with humidity, ensuring strong bonding between the foam and the inner rubber even in harsh conditions, and is applied after cleaning the tire surface with a high-pressure water jet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesive layer is used to fix the foam strip to the inner rubber, then the foam strip can be initially bonded to the surface, but the adhesion power is lost under high temperature and humidity conditions due to release agents present on the rubber surface
Solution Approach 1:
The patent changes the chemical parameters of the adhesive by specifying a polyether polyol with specific molecular weight range (1,000-10,000 g/mol) and functional group content (0.5-5 mmol/g), which provides optimal balance between adhesion to rubber and cohesion with foam under varying temperature and humidity conditions
Solution Approach 2:
The adhesive layer is formulated as a composite system combining polyether polyol with specific additives including crosslinking agents, fillers, and coupling agents that enhance both initial bonding strength and long-term durability under harsh environmental conditions
2Strength
If the adhesive layer contains solvents or isocyanates to improve initial bonding, then adhesion strength increases, but the reliability under wet aging and fatigue conditions deteriorates
Solution Approach 1:
The patent employs a water-based or solvent-free adhesive formulation that uses environmentally benign components with limited service life in terms of chemical stability, relying instead on physical crosslinking and hydrogen bonding that develop over time under service conditions rather than providing immediate strong bonding
Solution Approach 2:
The adhesive formulation parameters are optimized to use polyether polyol with specific hydroxyl value and molecular weight that enables gradual crosslinking and maturation of bonding strength under service conditions, sacrificing initial bonding speed for long-term durability
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 silanized polyether adhesive provides durable and reliable bonding, maintaining adhesion performance under wet aging and fatigue tests, with higher peel strength and resistance to cohesive rupture, effectively reducing cavity noises in tires.
Implementation Method 1
the adhesive layer is based on a silanized polyether... the adhesive layer is allowed to crosslink
Implementation Method 2
the adhesive layer is based on a silanized polyether... improves the fixation of the foam strip even in humid and hot driving conditions
Implementation Method 3
the surface of the inner rubber of said tire is treated with a high-pressure water jet to clean said surface
Data Source
Figure 1
AI summary
The invention relates to a tyre comprising an inner liner facing an inner cavity of the tyre, a layer of adhesive disposed on the inner liner, and a strip of sound-damping foam secured to the inner liner by the adhesive layer, characterised in that the adhesive layer comprises silanised polyether.