WO2022040386A1 - Amortisseur de bruit à application de liquide en couches - Google Patents

Amortisseur de bruit à application de liquide en couches Download PDF

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Publication number
WO2022040386A1
WO2022040386A1 PCT/US2021/046624 US2021046624W WO2022040386A1 WO 2022040386 A1 WO2022040386 A1 WO 2022040386A1 US 2021046624 W US2021046624 W US 2021046624W WO 2022040386 A1 WO2022040386 A1 WO 2022040386A1
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WO
WIPO (PCT)
Prior art keywords
composition
article
layer
damping
formulation
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PCT/US2021/046624
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English (en)
Inventor
Nicholas Xuanlai FANG
John David CAMPBELL
Shahrzad Ghaffari MOSANENZADEH
Joshua C. SPEROS
Sean Raymond GEORGE
Karl R. NICHOLAS
Original Assignee
Basf Se
Massachusetts Institute Of Technology
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Publication of WO2022040386A1 publication Critical patent/WO2022040386A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/3605—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by their material
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2224/00—Materials; Material properties
    • F16F2224/005—Combined materials of same basic nature but differing characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/001—Specific functional characteristics in numerical form or in the form of equations
    • F16F2228/005—Material properties, e.g. moduli
    • F16F2228/007—Material properties, e.g. moduli of solids, e.g. hardness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/06—Stiffness

Definitions

  • the present technology is generally related to liquid-applied sound damping ("LASD”) coatings, and methods of their application and preparation, and their use in downstream applications.
  • LASD liquid-applied sound damping
  • the present technology is directed to an article of manufacture that includes a damping formulation deposited on a substrate, wherein the damping formulation includes a first layer and a second layer and the first layer includes a first composition and the second layer includes a second composition having a stiffness less than 10-times greater than the first composition.
  • the article exhibits greater vibrational and/or acoustic sound damping than the same amount of the damping formulation that includes a mixture of the first composition and the second composition deposited in a single layer on the substrate as measured by a composite loss factor ("CLF").
  • CLF composite loss factor
  • the article exhibits an average of at least, about 20% more vibrational and/or acoustic sound damping than the same amount of the damping formulation comprising a mixture of the first composition and the second composition deposited in a single layer on the substrate.
  • the present technology is directed to a method of damping sound that includes applying/depositing on the substrate the first layer of the damping formulation and applying/depositing the second layer of the damping formulation on the first layer as disclosed herein.
  • FIG. 1A is a schematic of panel test setup and FIG. IB is graph illustrating the method of determining CLF using frequency response function and half-power-band width, according to the examples.
  • FIG. 2 is a photo of test bars A-F showing their varying total thickness and layer thicknesses, according to the examples.
  • FIG. 3 is a graph illustrating the composite loss factor ("CLF") for bars A-F at varying frequencies, according to the examples.
  • FIG. 4A is an illustration of a first test bar with two LASD layers deposited (high T g layered on top of a low T g ) and a second bar with a single layer of a 1:1 blend of the same LASD formulas.
  • FIGS. 4B-4D are graphs illustrating the CLF for each bar at varying temperatures and resonance frequencies, according to the examples.
  • FIG. 5A is an illustration of a first test bar with two LASD layers deposited (normal LASD layered on top of LASD with expanded microspheres) and a second bar with a single layer of a 1:1 blend of the same LASD formulas.
  • FIGS. 5B-5D are graphs illustrating the CI..F for each bar at varying temperatures and resonance frequencies, according to the examples.
  • LASD formulations are robotically and strategically applied as a single continuous coating of a heavily formulated waterborne system to the interior of a vehicle body.
  • These formulations are complex, but contain two principle components: a waterborne emulsion polymer and a cost- effective dense filler (e.g. CaCO 3 ).
  • the polymer serves to bind the dense filler together in the dried coating and damps vibration by nature of its viscoelastic properties.
  • the filler is largely present to add mass (a traditional damping technique) and to reduce the cost of the formulation.
  • an article of manufacture that includes a damping formulation deposited on a substrate, wherein the damping formulation includes a first layer and a second layer and the first layer includes a first composition and the second layer includes a second composition having a stiffness less than 10-times greater than the first composition.
  • the damping formulation is configured to dampen vibrational and/or acoustic sound from and/or through the substrate.
  • the article exhibits greater vibrational and/or acoustic sound damping than the same amount of the damping formulation included a mixture of the first composition and the second composition deposited in a single layer on the substrate as measured by a composite loss factor ("CLF").
  • CLF composite loss factor
  • the stiffness may vary by using different polymers (e.g., a polymer with a lower glass transition temperature (T g ) for lower stiffness and a polymer with a higher T g for higher stiffness), different density formulations (e.g., for a lower density formulation more filler or lower density filler may be used), and polymer crosslinking.
  • the damping formulation may be any formulation disclosed in WO 2019/099372, WO 2017/062878, US Pub. Appl. Nos. 2019/0016918, 2018/0030263, 2016/0035339, 2009/0045008, and US Patent No. 7,186,442, each of which is incorporated herein by reference.
  • the damping formulation may be a liquid-applied sound damping ("LASD") formulation.
  • the damping formulation may be an aqueous- based formulation.
  • the damping formulation is a vibration damping formulation, an acoustic damping formulation, or both a vibration and an acoustic damping formulation.
  • the article with the damping formulation including a first layer and a second layer exhibits an average of at least about 20% more vibrational and/or acoustic sound damping based on CLF than the same amount of the damping formulation including a mixture of the first and second compositions deposited in a single layer on the substrate. In some embodiments, the article exhibits an average of at least about 30%, at least about 40%, at least about 50%, or at.
  • the CLF is measured at about 100 to about 800 Hz (including about 100 Hz, about 125 Hz, about 160 Hz, about 200 Hz, about 250 Hz, about 315 Hz, about 400 Hz, about 500 Hz, about 630 Hz, and/or 800 Hz determined for 1/3 octave band frequencies ("OBF").
  • the damping formulation deposited on the substrate may include two or more layers (e.g., 2, 3, or 4 layers).
  • the first layer preferably includes a first composition that includes a first polymeric material and the second layer preferably includes a second composition that includes a second polymeric material.
  • the first polymeric material and the second polymeric material are the same.
  • polymers may include the same monomeric units but have different molecular weights.
  • the fillers in the first and second compositions may differ (e.g., different types of fillers and/or different amounts of fillers).
  • the first polymeric material and the second polymeric material are different.
  • the first layer is below the second layer (i.e., the first layer is the lower layer and the second layer is the upper layer).
  • the first layer may be deposited on the substrate.
  • the second layer may be deposited on the first layer such that the second layer is in direct contact with the first layer.
  • the first layer is uniformly deposited on the substrate and the second layer is uniformly deposited on the first layer.
  • the second composition has a Young's Modulus stiffness factor less than 10-times greater than the first composition (e.g., the second composition may have a Young's Modulus (E’) less than 1.0 x 10 9 MPa compared to the first composition) .
  • the second composition has a Young's Modulus stiffness factor less than 10-times greater than the first composition (e.g., the second composition may have a Young's Modulus (E') less than 1.0 x 10 9 Pa compared to the first composition).
  • the second composition has a stiffness factor less than 8-times greater, less than 5-times greater, less than 3-times greater, or less than 2-times greater than the first composition.
  • the first composition has a stiffness of about 5 MPa to about 1000 MPa and the second composition has a stiffness of about 1000 MPa to about 10,000 MPa. In some embodiments, the first composition has a stiffness of about 5 MPa to about 800 MPa, about 5 MPa to about 500 MPa, or about 5 MPa to about 300 MPa. In some embodiments, the second composition has a stiffness of about 1100 MPa to about 8000 MPa, about 1200 MPa to about 7000 MPa, or about 1400 MPa to about 6000 MPa. In some embodiments, the first composition has a stiffness of about 10 MPa to about 100 MPa and the second composition has a stiffness of about 1500 MPa to about 5000 MPa.
  • the first composition has a lower glass transition temperature than the second composition.
  • the first composition may have a glass transition temperature (T g ) from about -20 °C to about 10 °C.
  • the first composition may have a glass transition temperature (Tg) from about -10 °C to about 10 °C or about -5 °C to about 5 °C.
  • the second composition may have a glass transition temperature (T g ) from about 10 °C to about 40 °C.
  • the second composition may have a glass transition temperature (Tg) from about 15 °C to about 30 °C or 15 °C to about 25 °C.
  • the first composition has a lower density than the second composition. In some embodiments, the first composition may have a density at least about 1.5 times lower than the second composition. In some embodiments, the first composition may have a density at least about 2 times, about 2.5 times, or about 3 times lower than the second composition. In some embodiments, the first composition may have a density from about 500 kg/m 3 to about 1500 kg/m 3 . In some embodiments, the first composition may have a density from about 600 kg/m 3 to about 1400 kg/m 3 . In some embodiments, the first composition may have a density from about 700 kg/m 3 to about 1300 kg/m 3 .
  • the first composition may have a density from about 800 kg/m 3 to about 1200 kg/m 3 .
  • the second composition may have a density from about 1500 kg/m 3 to about 2500 kg/m 3 .
  • the second composition may have a density from about 1600 kg/m 3 to about 2400 kg/m 3 .
  • the second composition may have a density from about 1700 kg/m 3 to about 2300 kg/m 3 .
  • the second composition may have a density from about 1800 kg/m 3 to about 2200 kg/m 3 .
  • the first composition has greater porosity than the second composition.
  • the first composition has a low density and high elastic modulus constrained by a dense second composition.
  • the damping formulation includes a porous lower layer constrained with a solid upper layer both made of LASD material.
  • the lower layer and the upper layer may both be made of pre-existing formulations (e.g. high/low density or high/low modulus).
  • the first polymeric material and the second polymeric material may be the same or different and may be any polymeric material as long as the respective first composition and second composition have at least one of the physical properties described herein.
  • the first composition and second composition have at least the Young's Modulus, T g , and/or density described herein.
  • the polymeric material may be an acrylic based polymeric material.
  • the damping formulation may also include a filler.
  • the filler may be in the first composition, the second composition, or both the first and second compositions.
  • the first composition and the second composition may include the same filler.
  • a filler include, but are not limited to, calcium carbonate, barium sulfate, glass filler, magnesium carbonate, microsphere (e.g., plastic or glass), mica, or a combination of two or more thereof.
  • the filler may include calcium carbonate.
  • the filler may include microsphere including expanded microspheres.
  • the first composition and the second composition may include 0 to about 85 wt% filler (e.g., 0 to about 75 wt%, 0 to about 50 wt%, 0 to about 25 wt%, 0 to 15 wt%, 5 to about 75 vrt%, 10 to about 65 vrt%, 20 to about 60 vrt%, or 30 to 50 wt%).
  • the first composition may include about 1.5-times or greater filler than the second composition.
  • the damping formulation may also include other additives such as a defoaming agent, a rheological modifier, an emulsifying agent, a biocide, or a mixture of any two or more thereof.
  • the damping formulation can also include pigments for aesthetic purposes. The pigments can be, but are not limited to, black or white pigments.
  • the damping formulation may have a thickness of about 0.5 mm to about 20 mm, about 0.5 mm to about 10 mm, about 1.0 mm to about 9.0 mm, about 2.0 mm to about 8.0 mm, about 2.0 mm to about 6.0 mm, or about 1 mm to about 5 mm.
  • the first layer may have a thickness of about 0.5 mm to about 10 mm, about 1.0 mm to about 9.0 mm, about 2.0 mm to about 8.0 mm, about 2.0 mm to about 6.0 mm, or about 1 mm to about 5 mm.
  • the second layer may have a thickness of about 0.5 mm to about 10 mm, about 1.0 mm to about 9.0 mm, about 2.0 mm to about 8.0 mm, about 2.0 mm to about 6.0 mm, or about 1 mm to about 5 mm.
  • the first layer and the second layer may have about the same thickness.
  • the first layer may be thicker than the second layer or the second layer may be thicker than the first layer.
  • the substrate of the present disclosure may be an automotive (e.g., vehicle), airplane, home appliances (e.g., dishwasher or washing machine), building material, computer, vacuum cleaner, HVAC system, and/or flooring.
  • the substrate may be a vehicle.
  • Other advantages that may be imparted to the article by the damping formulation include, but are not limited to, optimization of barrier properties over the sound damping formulation, good flexibility, and ease of application. Further advantages include but are not limited to mass reduction/optimization.
  • a method of damping sound that includes applying to the substrate the first layer of the damping formulation as disclosed herein and the second layer of damping formulation as disclosed herein.
  • the method may include applying to the substrate the first layer of the damping formulation and applying the second layer of the damping formulation to the first layer.
  • the damping formulation may be in liquid form during the application.
  • the damping formulation has a viscosity of about 5000 to about 300,000 cps (centipoise) (including viscosities of about 10,000 to about 200,000 cps, about 10,000 to about 150,000 cps, or about 10,000 to about 100,000 cps). Methods to measure viscosity will be well known to a person skilled in the art.
  • Embodiment 1 is an article of manufacture comprising a damping formulation deposited on a substrate, wherein the damping formulation is configured to dampen vibrational and/or acoustic sound from and/or through the substrate: wherein: the damping formulation comprises a first layer and a second layer, wherein: the first layer comprises a first composition and the second layer comprises a second composition; and the second composition has a stiffness less than 10-times greater than the first composition; and the article exhibits greater vibrational and/or acoustic sound damping than the same amount of the damping formulation comprising a mixture of the first composition and the second composition deposited in a single layer on the substrate as measured by a composite loss factor.
  • Embodiment 2 is the article of embodiment 1, wherein the first composition comprises a first polymeric material and the second composition comprises a second polymeric material and the first polymeric material and the second polymeric material are the same.
  • Embodiment 3 is the article of embodiment 1, wherein the first composition comprises a first polymeric material and the second composition comprises a second polymeric material and the first polymeric material and the second polymeric material are different.
  • Embodiment 4 is the article of any one of embodiments 1-3, wherein the damping formulation comprises a filler, a defoaming agent, a rheological modifier, a emulsifying agent, a biocide, or a mixture of any two or more thereof.
  • Embodiment 5 is the article of embodiment 4, wherein the damping formulation comprises the filler.
  • Embodiment 6 is the article of embodiment 5, wherein the filler comprises calcium carbonate, microspheres, or a combination thereof.
  • Embodiment 7 is the article of embodiment 5 or embodiment 6, wherein the first composition and the second composition comprise the filler.
  • Embodiment 8 is the article of any one of embodiments 5-7, wherein the first composition and the second composition comprise the same filler.
  • Embodiment 9 is the article of any one of embodiments 1-8, wherein the article exhibits an average of at least about 20% more vibrational and/or acoustic sound damping than the same amount of the damping formulation comprising a mixture of the first composition and the second composition deposited in a single layer on the substrate.
  • Embodiment 10 is the article of any one of embodiments 1-9, wherein the article exhibits an average of at least about 30% more vibrational and/or acoustic sound damping than the same amount of the damping formulation comprising a mixture of the first composition and the second composition deposited in a single layer on the substrate.
  • Embodiment 11 is the article of any one of embodiments 1-10, wherein the article exhibits an average of at least about 40% more vibrational and/or acoustic sound damping than the same amount of the damping formulation comprising a mixture of the first composition and the second composition deposited in a single layer on the substrate.
  • Embodiment 12 is the article of any one of embodiments 1-11, wherein the damping formulation is a vibration damping formulation.
  • Embodiment 13 is the article of any one of embodiments 1-12, wherein the second layer is in direct contact with the first layer.
  • Embodiment 14 is the article of any one of embodiments 1-13, wherein the first layer is uniformly deposited on the substrate and the second layer is uniformly deposited on the first layer.
  • Embodiment 15 is the article of any one of embodiments 1-14, wherein the first composition has a lower glass transition temperature than the second composition.
  • Embodiment 16 is the article of any one of embodiments 1-15, wherein the first composition has a lower density than the second composition.
  • Embodiment 17 is the article of any one of embodiments 1-16, wherein the second composition has a stiffness factor less than 8-times higher than the first composition.
  • Embodiment 18 is the article of any one of embodiments 1-17, wherein the second composition has a stiffness factor less than 5-times greater than the first composition.
  • Embodiment 19 is the article of any one of embodiments 1-18, wherein the first composition has a stiffness of about 5 MPa to about 1000 MPa and the second composition has a stiffness of about 1000 MPa to about 10,000 MPa.
  • Embodiment 20 is the article of any one of embodiments 1-19, wherein the first composition has a stiffness of about 10 MPa to about 100 MPa and the second composition has a stiffness of about 1500 MPa to about 5000 MPa.
  • Embodiment 2.1 is the article of any one of embodiments 1-20, wherein the first composition has greater porosity than the second composition.
  • Embodiment 22 is the article of any one of embodiments 1-21, wherein the damping formulation has a thickness of about 0.5 mm to about 10 mm.
  • Embodiment 23 is the article of any one of embodiments 1-22, wherein the damping formulation has a thickness of about 2.0 mm to about 8.0 mm.
  • Embodiment 24 is the article of any one of embodiments 1-23, wherein the first layer has a thickness of about 0.5 mm to about 10 mm and the second layer has a thickness of about 0.5 mm to about 10 mm.
  • Embodiment 25 is the article of any one of embodiments 1-24, wherein the first layer has a thickness of about 1 mm to about 5 mm and the second layer has a thickness of about 1 mm to about 5 mm.
  • Embodiment 26 is the article of embodiment 24 or embodiment 25, wherein the first layer and the second layer have about the same thickness.
  • Embodiment 27 is the article of embodiment 24 or embodiment 25, wherein the first layer is thicker than the second layer.
  • Embodiment 28 is the article of embodiment 24 or embodiment 25, wherein the second layer is thicker than the first layer.
  • Embodiment 29 is the article of any one of embodiments 1-28, wherein the damping formulation is a liquid-applied sound damping formulation.
  • Embodiment 30 is the article of any one of embodiments 1-29, wherein the damping formulation is an aqueous-based formulation.
  • Embodiment 31 is the article of any one of embodiments 1-30, wherein the substrate is a vehicle.
  • Embodiment 32 is a method of damping sound, the method comprising: applying to the substrate the first layer of the damping formulation in any one of embodiments 1-31; and applying the second layer of damping formulation on the first layer in any one of embodiments 1-31.
  • Embodiment 33 is the method of embodiment 32, wherein the damping formulation is in liquid, form during the applying.
  • Example l.Steel bars were tested to determine and compare vibration loss factors over a temperature range of 20 °C to 60 °C. Each bar was clamped into a heavy base (FIG. 1A). A non-contacting transducer excited the free-end of the bar and another non-contacting transducer near the fixed-end of the bar sent output to a processing unit to calculate the CLF. From the excitement measurements, mobility (frequency response function (“FRF”)) data was acquired relative to the force input in 1 Hz bands. Following the A STM E756 guidelines, the CLF was determined from the frequency response function by the half- power-bandwidth method (FIG. 1B) using the following equation: where CLF is the composite loss factor, E is the Young's modulus, H is the thickness, is peak width, is peak height, and A is a constant.
  • FPF frequency response function
  • Bar A including a single layer of low porosity damping formulation
  • Bar C including two layers of approximately equal thickness with an upper layer of low porosity damping formulation and a lower layer of high porosity damping formulation
  • Bar D including two layers of unequal thickness with an upper layer of low porosity damping formulation (about 1/3 of the total damping formulation thickness) and a lower layer of high porosity damping formulation (about 2/3 of the total damping formulation thickness) (FIG. 2).
  • Bars B, E, and F had the same total damping formulation thickness, which was about half the thickness of Bars A, C, and D.
  • the bars differed in Bar B including a single layer of low porosity damping formulation, Bar E including two layers of unequal thickness with an upper layer of low porosity damping formulation (about 2/3 of the total damping formulation thickness) and a lower layer of high porosity damping formulation (about 1/3 of the total damping formulation thickness), and Bar including two layers of unequal thickness with an upper layer of low porosity damping formulation (about 1/3 of the total damping formulation thickness) and a lower layer of high porosity damping formulation (about 2/3 of the total damping formulation thickness) (FIG. 2).
  • Example 2 Two metal bars (Oberst bars) were prepared and tested to determine and compare vibration loss factors. Each bar was rigidly mounted to a fixture and excited as described in Example 1. The first bar had two LASD layers deposited (high T g (20°C) LASD layered on top of a low T g (0°C) LASD) and the second bar had a single layer of a 1:1 blend of the same LASD formulas (FIG. 4A). The loss factor values for each bar at varying temperatures are provided in FIGS. 4B-4D at resonance modes of 100-170 Hz (Mode 2), 290-470 Hz (Mode 3), and 650-920 Hz (Mode 4). The bar with two layers provided improved CLF compared to the bar with a single mixed layer at temperatures above 20 °C (i.e., peak damping temperatures).
  • Example 3 Two metal bars (Oberst bars) were prepared and tested to determine and compare vibration loss factors. Each bar was rigidly mounted to a fixture and excited as described in Example 1. The first bar had two LASD layers deposited (normal density LASD layered on top of a low density LASD) and the second bar had a single layer of a 1 : 1 blend of the same LASD formulas (FIG. 5A). The loss factor values for each bar at varying temperatures are provided in FIGS. 5B-5D at resonance modes of 100-170 Hz (Mode 2), 290-470 Hz (Mode 3), and 200 Hz. The bar with two layers provided slightly improved CLF compared to the bar with a single mixed layer at temperatures at about and above 20 °C (i.e., at or near peak damping temperatures).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un article fabriqué et des procédés de fabrication de l'article qui comprend une formulation d'amortissement déposée sur un substrat, la formulation d'amortissement comprenant une première couche comportant une première composition et une seconde couche comportant une seconde composition et la seconde composition ayant une rigidité inférieure 10 fois plus à la première composition. L'article présente un amortissement vibratoire et/ou acoustique plus important que la même quantité de la formulation d'amortissement comprenant un mélange de la première composition et de la seconde composition déposée en une seule couche sur le substrat telle que mesurée par un facteur de perte composite.
PCT/US2021/046624 2020-08-19 2021-08-19 Amortisseur de bruit à application de liquide en couches WO2022040386A1 (fr)

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US20090045008A1 (en) 2005-04-26 2009-02-19 Shiloh Industries, Inc. Acrylate-based sound damping material and method of preparing same
US20160035339A1 (en) 2013-02-11 2016-02-04 Henkel Ag & Co. Kgaa Liquid Rubber Damping Composition
WO2017062878A1 (fr) 2015-10-09 2017-04-13 Basf Se Compositions de barrière acoustique appliquées par pulvérisation sur des matériaux d'absorption
US20180030263A1 (en) 2015-02-11 2018-02-01 Polyone Corporation Sound damping thermoplastic elastomer articles
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JP2019073046A (ja) * 2017-10-12 2019-05-16 ケーエムマテリアル株式会社 船舶用制振材
WO2019099372A1 (fr) 2017-11-14 2019-05-23 Basf Se Compositions à séchage rapide, à haut extrait sec et résistantes à l'affaissement, revêtements, emballage à deux éléments constitutifs et procédé de revêtement

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Publication number Priority date Publication date Assignee Title
GB2266252A (en) * 1992-04-06 1993-10-27 Weinsheim Gmbh Chem Werke Damping cover
US7186442B2 (en) 2003-06-11 2007-03-06 Sika Technology Ag Constrained layer damper
US20090045008A1 (en) 2005-04-26 2009-02-19 Shiloh Industries, Inc. Acrylate-based sound damping material and method of preparing same
US20160035339A1 (en) 2013-02-11 2016-02-04 Henkel Ag & Co. Kgaa Liquid Rubber Damping Composition
US20180030263A1 (en) 2015-02-11 2018-02-01 Polyone Corporation Sound damping thermoplastic elastomer articles
WO2017062878A1 (fr) 2015-10-09 2017-04-13 Basf Se Compositions de barrière acoustique appliquées par pulvérisation sur des matériaux d'absorption
US20190016918A1 (en) 2016-01-15 2019-01-17 Ppg Industries Ohio, Inc. Hydroxy functional alkyl polyurea containing compositions
JP2019073046A (ja) * 2017-10-12 2019-05-16 ケーエムマテリアル株式会社 船舶用制振材
WO2019099372A1 (fr) 2017-11-14 2019-05-23 Basf Se Compositions à séchage rapide, à haut extrait sec et résistantes à l'affaissement, revêtements, emballage à deux éléments constitutifs et procédé de revêtement

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