Foam-Pore Metal Sheet Coating for Vibration Damping and Sound Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional unconstrained vibration damping steel sheets have limited vibration damping performance due to the use of polymer resins, which are not effective in applications generating significant noise and vibrations, such as household appliances and automobiles.
Innovation Solution
An unconstrained vibration damping metal sheet with foam pores is developed, comprising a metal sheet, an organic-inorganic pretreatment layer, and a foam resin layer containing thermoplastic polyvinyl chloride resin, plasticizer, foaming agent, oxide-based crosslinker, and spherical silica, which are applied and foamed to create pores for enhanced damping and sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer resins are used in conventional unconstrained vibration damping steel sheets, then the manufacturing process is simple, but the vibration damping performance is insufficient for high-noise applications
Solution Approach 1:
The patent uses a composite structure consisting of a metal sheet substrate combined with a foam resin coating layer. This composite material approach allows the simple unconstrained coating process to achieve enhanced vibration damping performance through the synergistic combination of the metal substrate and the viscoelastic foam resin, resolving the contradiction between manufacturing simplicity and damping effectiveness.
Solution Approach 2:
The patent employs a foam resin coating with controlled porosity (foam pores) to achieve superior vibration damping performance. The porous structure of the foam resin provides increased surface area and viscoelastic damping mechanisms, enabling the material to effectively dissipate vibration energy while maintaining the simplicity of the unconstrained coating application process.
2Ease of manufacture
If conventional polymer resins are applied to metal sheets, then the coating process is straightforward, but the sound insulation performance is limited
Solution Approach 1:
The foam resin coating with its porous structure provides both vibration damping and sound insulation functions. The foam pores create acoustic impedance that blocks sound transmission while the viscoelastic material absorbs vibration energy, thereby reducing noise and harmful sound transmission while maintaining coating process simplicity.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the coating material by using foam resin with specific porosity, density, and viscoelastic properties. These parameter changes enable the coating to achieve superior sound insulation and vibration damping performance compared to conventional solid polymer resins, while the coating application process remains straightforward.
3Device complexity
If a two-layer unconstrained steel sheet structure is used, then the manufacturing process is simple, but the vibration damping effect is relatively low
Solution Approach 1:
The patent creates a composite material system within the two-layer unconstrained structure by combining the metal sheet with a specially formulated foam resin coating. This composite approach enhances the vibration damping effect through the viscoelastic properties of the foam resin, which converts vibration energy into heat, while maintaining the structural simplicity of the two-layer configuration.
Solution Approach 2:
The foam resin coating with its porous structure provides enhanced vibration damping capability compared to solid resins. The foam pores increase the material's ability to dissipate vibration energy through air movement and structural damping, thereby improving the vibration damping effect while maintaining the simple two-layer unconstrained structure.
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 metal sheet achieves improved vibration damping and sound insulation performance by effectively converting vibration energy into thermal energy through the viscoelastic properties of the foam pores, outperforming conventional methods in loss factor and sound insulation.
Implementation Method 1
implementing vibration damping performance and sound insulation performance using viscoelastic properties of a polymer resin
Implementation Method 2
foam pores formed through foaming in a coating film of the metal sheet
Data Source
AI summary
Provided is an unconstrained vibration damping metal sheet with foam pores. The unconstrained vibration damping metal sheet of the present invention comprises: a metal sheet; an organic-inorganic pretreatment layer containing an acrylic resin formed on the metal sheet; and a foam resin layer formed on the pretreatment layer, the foam resin layer containing, based on weight % thereof, a thermoplastic polyvinyl chloride resin: 40-80%, a plasticizer: 5-40%, a foaming agent: 0.1-10%, an oxide-based crosslinker: 1-4%, and spherical silica: 1-10%.