Acoustic Damping Material Adhesion Low Temperatures
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Solution Overview
Problem
Existing acoustic damping materials used in the automotive and home appliance industries perform poorly in the ball drop test at low temperatures, particularly at -30°C, and have inadequate adhesion to substrates.
Innovation Solution
An acoustic damping material comprising ≥ 0.75 wt.-% of polybutadiene, ≥ 10 wt.-% of liquid rubber, ≥ 3 wt.-% of butyl rubber, ≥ 3 wt.-% of natural or synthetic polyisoprene, 4 - 15 wt.-% of hydrocarbon resin, and at least one solid particulate filler, optimized for improved performance at low temperatures and enhanced adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rubber-based acoustic damping materials are used, then vibration damping performance is achieved, but adhesion at low temperatures deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of bitumen as the base material, combined with specific rubber additives (polybutadiene, butyl rubber, polyisoprene) and hydrocarbon resin. This composite formulation creates a multi-phase material that maintains adhesion at low temperatures while providing vibration damping performance. The different components work synergistically to resolve the contradiction between adhesion strength and low-temperature performance.
Solution Approach 2:
The patent modifies the chemical composition parameters of the damping material by incorporating specific ratios of rubber additives (≥0.75 wt.% polybutadiene, ≥3 wt.% butyl rubber, ≥3 wt.% polyisoprene) and hydrocarbon resin (4-15 wt.%). These parameter changes alter the material's viscoelastic properties and adhesion characteristics, enabling it to maintain bonding strength at low temperatures while preserving vibration damping capabilities.
2Ease of manufacture
If bitumen-based compositions are used for acoustic damping, then cost-effectiveness and vibration damping properties are improved, but adhesion at low temperatures deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the damping material by incorporating specific ratios of rubber additives (≥0.75 wt.% polybutadiene, ≥3 wt.% butyl rubber, ≥3 wt.% polyisoprene) and hydrocarbon resin (4-15 wt.%). These parameter changes alter the material's viscoelastic properties and adhesion characteristics, enabling it to maintain bonding strength at low temperatures while preserving vibration damping capabilities.
Solution Approach 2:
The patent uses a composite material system consisting of bitumen as the base material, combined with specific rubber additives (polybutadiene, butyl rubber, polyisoprene) and hydrocarbon resin. This composite formulation creates a multi-phase material that maintains adhesion at low temperatures while providing vibration damping performance. The different components work synergistically to resolve the contradiction between adhesion strength and low-temperature 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 acoustic damping material exhibits improved vibration and noise damping properties comparable to or exceeding those of commercial rubber-based materials, while demonstrating superior performance in the ball drop test at low temperatures and strong adhesion to substrates.
Implementation Method 1
The damping layer is capable of dissipating kinetic energy of the vibrating surface into heat energy through extension and compression of the material of the damping layer
Implementation Method 2
Pre-formed single- and multiple-layer damping elements often comprise a layer of an adhesive composition, such as a pressure sensitive adhesive (PSA) or a hotmelt adhesive, to enable bonding of the damping layer to a surface of a substrate
Data Source
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AI summary
The invention is directed to an acoustic damping material comprising at least one polybutadiene PB, at least one at 25 °C liquid rubber LR, at least one butyl rubber BR, at least one natural or synthetic polyisoprene PI, at least one hydrocarbon resin HR and at least one solid particulate filler FM. The acoustic damping material is suitable for use in damping of undesired vibrations and noise in mechanical structures and components of manufactured articles. The invention is also directed to use of the acoustic damping material for damping of vibrations and noise in transportation vehicles and white goods, to a vibration and noise damping element comprising an adhesive layer composed of the acoustic damping material, to a method for applying a vibration and noise damping element to a noise emitting surface of a substrate, and to a vibration damped system comprising a substrate and the vibration and noise damping element bonded to a noise emitting surface of the substrate.