Acoustic Damping Composition with Elastomeric Particles
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Solution Overview
Problem
Conventional methods for noise control in urban settings, such as resilient members and thick insulative materials, are cumbersome, expensive, and ineffective, particularly in high-rise buildings, where there is a need for improved acoustic damping solutions to reduce noise transmission.
Innovation Solution
An acoustic damping composition comprising a binder resin, a modifying resin, and elastomeric particles, which is formulated as a water-based emulsion and applied between rigid panels to form a laminate, enhancing sound control by providing a Mode 1 Damping Parameter of at least 0.45 and Mode 2 Damping Parameter of at least 0.27, thereby improving noise reduction in construction materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional resilient members are used for noise control, then noise reduction is achieved, but installation complexity and cost increase
Solution Approach 1:
The patent extracts the essential noise control function from complex resilient member systems and implements it through a simple damping composition applied directly to panel surfaces. The composition contains elastomeric particles (5-50 micrometer size) embedded in a binder matrix that provides vibration damping without requiring separate resilient members, fasteners, or complex assembly steps.
Solution Approach 2:
The patent replaces mechanical resilient member systems with a viscoelastic damping composition that dissipates vibration energy through internal friction mechanisms. The elastomeric particles create a composite material with enhanced loss modulus that converts mechanical vibration energy into heat, eliminating the need for mechanical isolation components.
2Object-affected harmful factors
If thick insulative members are used for noise control, then noise reduction is achieved, but construction time and complexity increase
Solution Approach 1:
The patent uses a thin film damping composition (1-5 millimeter thickness) that contains elastomeric particles to achieve noise control without requiring thick insulative members. The flexible composition can be applied in thin layers while maintaining effective vibration damping through the viscoelastic properties of the elastomeric particle-binder composite.
Solution Approach 2:
The patent creates a composite damping material by dispersing elastomeric particles (5-50 micrometer diameter) within a binder matrix. This composite structure provides superior vibration damping performance per unit thickness compared to conventional homogeneous insulative materials, reducing the required material thickness and construction time.
3Object-affected harmful factors
If conventional damping materials are used, then limited sound control is achieved, but material simplicity is maintained
Solution Approach 1:
The patent employs a composite material system consisting of elastomeric particles (5-50 micrometer size) dispersed in a binder matrix with specific glass transition temperature characteristics. This composite structure provides enhanced vibration damping across multiple frequency ranges compared to conventional homogeneous damping materials, achieving superior sound control through the synergistic interaction between particle and matrix phases.
Solution Approach 2:
The patent optimizes the glass transition temperature of the binder matrix to be within -50°C to 0°C, which maximizes the viscoelastic damping performance of the composite material at ambient temperatures. This parameter optimization ensures that the damping composition maintains effective vibration energy dissipation across the audible frequency range while controlling sound transmission.
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 acoustic damping composition effectively reduces noise transmission by enhancing damping performance, outperforming commercial products like GREEN GLUE with increased Mode 1 and Mode 2 Damping Parameters, providing improved soundproofing in walls, ceilings, and floors.
Implementation Method 1
elastomeric particles may have an average particle size of not greater than 850 micrometers and may have a modulus of elasticity of not greater than 20 MPa
Implementation Method 2
The acoustic damping composition has a Mode 1 Damping Parameter of at least 0.45
Implementation Method 3
an acoustic damping composition includes a binder resin, a modifying resin, and elastomeric particles
Implementation Method 4
When applied, the water of the water-based emulsion may evaporate to leave the binder resin, the modifying resin, and elastomeric particles of the acoustic damping composition
Data Source
AI summary
An acoustic damping composition includes a urethane component, elastomeric particles, and a binder resin including an addition polymer having a carboxylic functional group. The acoustic damping composition can have a Mode 1 Damping Parameter of at least 0.45. The binder resin can have a glass transition temperature of not greater than −25° C.