Tire Sound-Absorbing Foam That Limits Liquid Latex Absorption
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Solution Overview
Problem
Sound-absorbing materials attached to tire inner surfaces absorb excessive liquid latex, hindering the sealing performance in emergency tire puncture repairs, as they are designed to reduce cavity noise but fail to optimize latex supply to the puncture site.
Innovation Solution
A sound-absorbing material comprising 90-98.5% polyurethane by weight, with a foam density of 30-35 kg/m3, and specific formulations of polyol, isocyanate compounds, crosslinking agents, and foaming agents, which minimizes liquid latex absorption while maintaining effective cavity noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound-absorbing material is attached to the inner surface of the tire to reduce cavity noise, then noise reduction effect is improved, but liquid latex absorption increases causing insufficient latex supply to puncture site
Solution Approach 1:
The sound-absorbing material incorporates a hydrophobic agent specifically in the regions where liquid latex needs to pass through, creating local hydrophobic properties. This allows the material to maintain its overall sound-absorbing function while selectively preventing latex absorption at critical locations, ensuring sufficient latex reaches the puncture site for effective sealing
2Object-affected harmful factors
If polyurethane foam is used for sound absorption, then noise reduction is achieved, but latex absorption capacity increases reducing sealing performance
Solution Approach 1:
A hydrophobic agent is introduced as an intermediary substance within the polyurethane foam structure. This agent mediates between the foam's natural affinity for liquid latex and the requirement for latex to reach the puncture site, modifying the foam's surface properties to repel latex while maintaining the underlying polyurethane's sound-absorbing characteristics
Solution Approach 2:
The invention changes the surface energy parameters of the polyurethane foam by incorporating a hydrophobic agent. This parameter modification transforms the foam from a hydrophilic state (which absorbs latex) to a hydrophobic state (which repels latex), allowing the material to maintain sound absorption while preventing excessive latex uptake that would compromise sealing performance
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 material achieves significant cavity noise reduction while optimizing liquid latex supply, ensuring adequate sealing performance by reducing latex absorption, thus enhancing the effectiveness of emergency tire puncture repairs.
Implementation Method 1
a typical method is to reduce cavity noise generated inside the tire by attaching urethane foam to the inner surface of the tire
Implementation Method 2
it has been difficult to satisfy sealing performance with the latex capacity applied to general tires
Data Source
AI summary
Disclosed is a sound-absorbing material for tires having an excellent cavity noise reduction effect and capable of minimizing the rate of absorption of liquid latex.