Plastisol Coating for Vehicle Underbody Vibration Damping
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Solution Overview
Problem
Current vibration damping materials, such as plasticized PVC coatings, fail to provide satisfactory vibration reduction across a range of temperatures and noise frequencies, particularly in vehicles, leading to inadequate noise, vibration, and harshness (NVH) mitigation for vehicle passengers.
Innovation Solution
A method involving the application of a plastisol comprising a polymeric component and a specific plasticizer, formed by the esterification product of certain carboxylic acids and diols, which is affixed to a substrate to enhance vibration damping performance across the desired temperature and frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plasticized PVC coatings are used for vibration damping, then ease of application and economy are maintained, but vibration damping performance across temperature and frequency ranges is inadequate
Solution Approach 1:
The patent modifies the chemical composition parameters of the plastisol by incorporating specific plasticizers (phthalates, terephthalates, isophthalates, trimellitates, adipates, cyclohexanedicarboxylates, benzoates, phosphates, citrates, succinates, alkyl sulfonates, fatty acid esters, epoxidized fatty acid esters, triglycerides, dianhydrohexitol diesters, pentaerythritol-based tetraesters, furan-based esters, other esters, ketals, and polymeric plasticizers) and polymeric components (polyvinyl chloride, polyvinyl acetate, acrylic polymers, vinyl chloride-containing copolymers) to achieve superior vibration damping performance across expanded temperature and frequency ranges while maintaining ease of application
Solution Approach 2:
The invention creates a composite plastisol formulation combining multiple plasticizer types with specific polymeric components to achieve synergistic vibration damping effects that neither component could achieve alone, thereby improving reliability and adaptability across varying environmental conditions
2Reliability
If asphaltic pads are used for noise suppression, then some vibration damping is achieved, but they require manual application, are subject to embrittlement, and must continue to adhere to the metal substrate
Solution Approach 1:
The patent replaces the mechanical application process required for asphaltic pads with a liquid-applied plastisol coating system that can be sprayed or rolled onto substrates, eliminating manual placement and conforming issues while maintaining effective vibration damping through the cured coating layer
3Reliability
If materials requiring high temperature and long times to cure are used, then vibration damping performance can be improved, but production speed decreases, cost increases, and energy usage increases
Solution Approach 1:
The patent formulates the plastisol with specific plasticizer-polymer combinations that enable effective vibration damping to be achieved at lower curing temperatures and shorter cure times, thereby maintaining productivity while improving the reliability of the damping 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 proposed solution significantly improves vibration damping, as evidenced by increased Tan Delta values, effectively reducing NVH in vehicles, while maintaining ease of application and economic viability.
Implementation Method 1
Polymeric materials can damp, or reduce oscillations of, a substrate by dissipating the oscillation energy with their viscoelastic behavior
Implementation Method 2
The ratio of the storage modulus to the loss modulus, a value known as the tan δ, is a measure of the material's ability to damp vibrations
Data Source
AI summary
Disclosed is a method for improving vibration damping of a substrate, such as the underbody of an automobile. The method comprises applying a plastisol which comprises a polymeric component and a plasticizer. The fused plastisol has improved damping behavior as determined using Dynamic Mechanical Thermal Analysis. Novel plastisols and novel plasticizers are also disclosed.