EP3043346A1 - Matériau composite absorbant le son ou à isolation acoustique - Google Patents

Matériau composite absorbant le son ou à isolation acoustique Download PDF

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Publication number
EP3043346A1
EP3043346A1 EP15150827.2A EP15150827A EP3043346A1 EP 3043346 A1 EP3043346 A1 EP 3043346A1 EP 15150827 A EP15150827 A EP 15150827A EP 3043346 A1 EP3043346 A1 EP 3043346A1
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EP
European Patent Office
Prior art keywords
particles
elasticity
modulus
viscoelastic
composite material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15150827.2A
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German (de)
English (en)
Inventor
Patrice Dr. Bujard
Raphael Dabbous
Andreas Strub
Andreas Hafner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
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BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to EP15150827.2A priority Critical patent/EP3043346A1/fr
Priority to PCT/EP2016/050438 priority patent/WO2016113241A1/fr
Priority to DE112016000315.3T priority patent/DE112016000315A5/de
Publication of EP3043346A1 publication Critical patent/EP3043346A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • G10K11/165—Particles in a matrix
    • 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

Definitions

  • the invention relates to a sound-absorbing or sound-absorbing composite material comprising particles embedded in a viscoelastic material. Further aspects of the invention relate to the use of the composite material and a method for its production.
  • the sound transmission factor T depends in particular on the basis weight of the component and the frequency f of the sound, with the attenuation increasing for larger surface masses and larger frequencies and thus the transmittance T decreasing.
  • the basis weight is given here from the product of the density ⁇ of the material and the thickness d of the component. This connection is known as Berger's mass law.
  • the acoustic crystals comprise a plurality of structural elements with local resonance.
  • the structural elements consist of a lead ball, which is coated with a soft elastic material.
  • the structural elements are embedded in an embodiment in an epoxy and thereby arranged in a cubic crystal lattice.
  • the structural elements are arranged in the form of a monolayer and are likewise embedded in an epoxide. Both variants show for a few specific frequencies a transmittance T, which is well below the expected according to the mass law transmittance.
  • Out JP H09-226035 A is a sound-insulating plate known whose sound attenuation is better than expected by the law of mass.
  • the plate comprises a foamed base material, for example of a plastic such as polyurethane or polyvinyl chloride.
  • the bubbles of the foamed base material contain particles, for example of aluminum, which can move in the bubbles.
  • the mass ratio of base material to particles is from 1: 0.2 to 1: 5 and the size of the bubbles is chosen so that the Move particles within a bubble by a distance in the range of 1 nm to 10 microns.
  • An object of the invention can be seen to provide a composite material which allows good sound attenuation over a wide frequency range.
  • the particles embedded in the viscoelastic material form, in combination with the viscoelastic material and the shell material or the shell material or the matrix material, a resonator which has at least one resonance frequency.
  • one particle in each case forms an oscillatable mass, which is connected via the viscoelastic material as a spring element with the fixed shell material.
  • each cell forms a self-contained system, with each particle in the cell representing an oscillatory mass.
  • This oscillatory mass is connected via the viscoelastic material as a spring element with the edge of the cell, which is formed depending on the variant by the shell material or by the transition from the viscoelastic material to the matrix material.
  • a single particle can be accommodated in one cell or several particles can be accommodated.
  • a first resonant frequency of such a resonator is given by the mass of the particle and the spring constant of the viscoelastic material.
  • This spring constant is determined by the Young's modulus (Young's modulus) and the geometric dimensions of the viscoelastic material surrounding the particle.
  • Phononic crystals make it possible to influence the propagation of sound in a targeted manner, whereby the generation of a band gap in the phononic crystal ideally completely suppresses sound propagation for certain frequencies.
  • the regular structures with a lattice constant of the order of magnitude of the sound wave length which are normally necessary for the generation of a phononic crystal can be replaced by the formation of a multiplicity of resonators, as in the publication of Z. Liu et al., Science Vol. 289 p. 1734 (September 8, 2000 ) was shown. There, structural elements with local resonance, each representing a resonator, were arranged with a lattice constant of 1.55 cm in the form of a simple cubic crystal lattice.
  • a model for calculating the resonant frequencies of such a phononic crystal and for estimating the expected sound transmission is disclosed in the publication M. Hirsekorn, APL Vol. 84, p. 3364 (2004 ) discussed.
  • the proposed sound-absorbing or sound-absorbing composite material has a multiplicity of resonators which interact in a manner similar to a phononic crystal and absorb or absorb sound incident on the composite material.
  • the particles have a diameter of less than 5000 ⁇ m, preferably less than 500 ⁇ m and particularly preferably less than 250 ⁇ m.
  • the diameter refers to the largest length between two points on the smallest projection surface of a particle ..
  • only an upper limit for the size of the particles is given, so that the particles used are not necessarily the same size. Rather, it is possible and preferred that the particles used have a particle size distribution, wherein this distribution is cut off above a certain particle size.
  • Such a maximum particle size can be defined, for example, by sieving, whereby all particles are screened out above a predetermined size.
  • the particles have a diameter of more than 5 .mu.m, preferably of more than 25 .mu.m and more preferably of more than 50 microns. Also, this minimum size of the particles can be specified for example by sieving, with all particles are sieved below the predetermined minimum size.
  • the particle size is important for the function of the composite because the particle size and density of the material of the particle gives the mass of a particle.
  • This mass of a particle in turn is a parameter for determining at least one resonance frequency of the resonators containing the particles.
  • a distribution of the resulting resonant frequencies is correlated with the particle size distribution.
  • the resonators receiving the particles also have identical resonance frequencies, provided the properties of the viscoelastic material apply to each one Resonator are also identical.
  • the composite material only for a few sound frequencies on a damping effect, which is above the expected effect of the Berger mass law.
  • the particle size distribution such that the resonance frequencies of the resonators are distributed over a frequency range in which a high sound attenuation is desired by the proposed composite material.
  • This frequency range is, for example, from 10 to 20,000 Hz, preferably from 10 to 10,000 Hz.
  • the particle size distribution as an equal distribution, so that each resonance frequency within a given frequency range is equally probable.
  • a particle size distribution can be chosen, in which larger particles are more frequently contained than smaller particles.
  • bimodal particle size distributions are conceivable, which have an increased frequency at two frequencies or in two sizes.
  • the particles may be irregular or regular in shape, with a spherical shape or a platelet shape being particularly preferred as regular shapes.
  • the particles of the composite material are usually irregular in shape and preferably have a ratio of a largest thickness to a smallest thickness of a particle of 1 to 10,000. Particularly preferred is a ratio of 1 to 100 and most preferably a ratio of 1 to 25 is preferred. In general, it is preferred to avoid particles with very sharp edges and corners. Round particles and rounded particles are preferably used.
  • particles that are integrally formed are composed of two or more smaller parts.
  • two parts with different density and / or different mass are joined together by means of a polymer.
  • the individual parts can perform against each other mechanical vibrations, similar to a dipole. There are thus further resonance frequencies available.
  • the polymer used to bond two particles preferably has a larger modulus of elasticity than the viscoelastic material.
  • the density of the material of the particles is greater than 3.5 g / cm 3 .
  • the density of the material of the particles is preferably selected to be greater than the density of the viscoelastic material. Particularly preferred is a density of the material of the particles of 3.5 to 19 g / cm 3, and most preferably a density of 6 to 12 g / cm 3 .
  • An upper limit for the density is given in practice by the density of osmium (22.6 g / cm 3 ).
  • the material of the particles is preferably selected from aluminum, titanium, zirconium, antimony, zinc, tin, manganese, iron, nickel, cobalt, copper, silver, lead, gold, tungsten, an alloy of said metals or a derivative of said metals with other atoms or combinations of atoms of CAS groups IA, IIA, IIIA, IVA, VA, VIA, and VIIA of the periodic table. More preferably, the metals are titanium, zinc, iron, copper, lead and tungsten, either pure or alloyed. Very particularly preferred metals are iron, copper, lead and tungsten.
  • the preferred atoms or combinations of atoms combined with said metals are those of the CAS groups IA, IIA, IIIA, IVA, VA, VIA, and VIIA of the shells K, L, M, N and O of the periodic table and Barium.
  • Examples of a combination of a metal with other atoms are alumina and steel.
  • the properties of the viscoelastic material also determine the resonant frequency of a resonator containing the particle. Relevant material properties are in particular the modulus of elasticity and the loss factor.
  • the viscoelastic material preferably has an E modulus of 0.05 to 25 MPa, more preferably of 0.5 to 5 MPa and most preferably of 0.5 to 3 MPa.
  • the viscoelastic material also exhibits a proportion of non-Newtonian behavior in addition to the pure elastic behavior.
  • the viscoelastic material preferably has a loss factor over a frequency range of 100 Hz to 10,000 Hz of greater than 0.01, more preferably greater than 0.05, and most preferably greater than 0.1.
  • the loss factor indicates how strongly a mechanical vibration of a particle embedded in the viscoelastic material is damped and, for example, converted into heat.
  • the viscoelastic material is preferably soft, in particular it is softer than the material of the particles.
  • the hardness of the viscoelastic material is preferably less than 85 Shore A and more preferably less than 65 Shore A.
  • the soft viscoelastic material allows the particle embedded therein to perform mechanical vibrations.
  • the viscoelastic material is preferably sufficiently hard that the middle layer in the case of alternative a) or the cells in the case of alternative b) are self-supporting.
  • the viscoelastic material is preferably selected from crosslinked, partially crosslinked or uncrosslinked elastomers or thermoplastic elastomers and copolymers. More preferably, the viscoelastic material is selected from a polysiloxane elastomer, a polyurethane, an olefin-based copolymer, a copolyester copolymer, a polyetherester copolymer, a polyetheramide copolymer, a styrene-butadiene-styrene copolymer, a styrene-butadiene-ethylene-styrene copolymer or a combination of at least two of said materials. Particularly preferred are the families of polysiloxane elastomers, polyurethanes, olefin-based copolymers and styrene-butadiene-ethylene-styrene copolymers.
  • the viscoelastic material is a foamed material or a foam.
  • foamed material or a foam.
  • the effective modulus of elasticity of the foamed material deviates from the modulus of elasticity of the material underlying the foam, and for the properties of the proposed composite the effective modulus of elasticity of the foamed material is relevant.
  • the pore size or the size of the cells of the resulting foam is preferably selected so that the foam is self-supporting.
  • the properties of the composite depend on the proportion of particles in the composite or on the proportion of particles in the viscoelastic material.
  • the proportion of particles in the viscoelastic material is preferably from 10 to 90 vol.%, Particularly preferably from 25 to 75 vol. % and most preferably from 40 to 50 vol. %.
  • the proportion of cells in the matrix material is preferably from 10 to 90 vol.%, Particularly preferably from 25 to 75 vol. % and most preferably from 40 to 50 vol. %.
  • the upper limit of the proportion of particles in the viscoelastic material is preferably chosen so that with uniform distribution of the particles, the distance between two particles (edge to edge) corresponds to at least one quarter of the particle diameter.
  • the particles are preferably evenly distributed in the viscoelastic material, but these need not form a regular structure such as the lattice of a crystal. Furthermore, in the case of alternative a), it is conceivable to provide a gradient in the distribution of the particles in the viscoelastic material so that, for example, a higher concentration of particles in the viscoelastic material is present on a first side facing the two enveloping layers, that in the direction of the other Page decreases.
  • the proportion of particles in the viscoelastic material accommodated in a cell is selected as described for variant a).
  • the cells are evenly distributed in the matrix material.
  • the viscoelastic material is incorporated as a middle layer in a sandwich structure, wherein the outer layers of the structure consist of a shell material.
  • the shell material includes the viscoelastic material with the embedded particles.
  • the shell material in the layer structure of alternative a) serves as an anchor, wherein the particles embedded in the viscoelastic material can perform mechanical oscillations relative to the shell material.
  • the layer thickness of the middle layer comprising the viscoelastic material is preferably from 1.5 times the particle diameter to 15 mm, more preferably 1.5 times the Particle diameter up to 10 mm.
  • the layer thicknesses of the two outer layers comprising the shell material are selected so that the composite material as a whole has sufficient stability for the desired application.
  • the modulus of elasticity of the shell material is greater than 5 MPa and particularly preferably Grumble e r than 10 MPa.
  • the shell material is preferably selected from a polymer, particularly preferably polyurethane, polyester, polyamide, polystyrene, polyoxymethylene, polycarbonate, polyvinyl chloride or a polyolefin, of a metal, particularly preferably aluminum, or of a ceramic, or of a composite of at least two of said materials ,
  • the viscoelastic material with the particles embedded therein is enclosed in a plurality of cells, which cells are in turn embedded in a matrix material.
  • the size of a cell is chosen so that the viscoelastic material, starting from the surface of an embedded particle has a thickness of 1.5 times the particle diameter to 15 mm, preferably from 1.5 times the particle diameter to 10 mm.
  • the matrix material in which the cells are embedded is preferably selected from an organic material, more preferably from an acrylate, a polyolefin, a polyester, a polyamide, a polyoxymethylene, a polycarbonate, a polystyrene, a polyvinyl chloride, an epoxy, a polyurethane , a melamine resin, or cellulose or an inorganic material.
  • an organic material more preferably from an acrylate, a polyolefin, a polyester, a polyamide, a polyoxymethylene, a polycarbonate, a polystyrene, a polyvinyl chloride, an epoxy, a polyurethane , a melamine resin, or cellulose or an inorganic material.
  • silica gel can be used as the inorganic material.
  • the cells may comprise a shell material which wraps around the viscoelastic material. Starting from a particle thus results in the material sequence particle material, viscoelastic material, shell material and matrix material.
  • the modulus of elasticity of the shell material according to alternative b) is greater than 5 MPa, particularly preferably greater than 10 MPa.
  • the shell material is selected from an organic material, preferably from a polymer, particularly preferably from an acrylate, a polyurethane, or from an inorganic material, preferably from an oxide, particularly preferably silicon oxide.
  • a composite material according to variant b) is used as part of a sandwich structure.
  • the matrix material in which a plurality of cells is embedded is used as a middle layer in a sandwich structure, wherein as outer Layers of the structure, a shell material according to variant a) of the invention is used.
  • This variant thus represents a combination of variants a) and b).
  • the materials selected for the composite may also contain one or more additives to improve their material properties.
  • the shell material, the matrix material and / or the viscoelastic material comprise one or more additives which are selected from an antioxidant, a light stabilizer, a metal deactivator, a stabilizer, a filler, a flame retardant, a plasticizer, a blowing agent, a nucleating agent, a processing agent, a dye, a pigment, or a combination of at least two additives.
  • Another aspect of the invention relates to the use of the proposed composite material as a sound-insulating film, as a sound-insulating plate, as an injection molded part, as a sound-absorbing coating or in the form of a combination of at least two of said objects.
  • a combination may, for example, be a sound-insulating panel with a coating applied thereto, wherein both the panel and the coating consist of one of the described composite materials or comprise a composite material according to the invention as one component.
  • Soundproofing films can be carried out, for example, in the form of coextruded films in which the film has a sandwich structure according to variant a).
  • Acoustic panels have, for example, a sandwich structure according to variant a), wherein the layer thickness of the shell material is selected at least on one side so that the plate is dimensionally stable.
  • sound-absorbing boards can also be designed according to variant b), wherein the matrix material with the embedded cells is formed into a plate with the desired thickness or thickness.
  • Injection molded parts can for example be constructed from the matrix material which contains embedded cells according to alternative b).
  • the proposed composite materials can be produced in a variety of ways, with examples selected below.
  • the sound-absorbing or sound-absorbing composite material can be obtained, for example, by first mixing the particles into the viscoelastic material.
  • the mixing can be carried out either at room temperature (typically with a stirring process, eg for curing elastomers such as polydimethylsiloxane) or at high temperature (typically with Banbury mixers, calendar rolls or extruders, eg for thermoplastic polyurethane).
  • a blowing agent can additionally be added during mixing, which leads to expansion of the viscoelastic material endothermic or exothermic at high temperature.
  • the mixture thus obtained can then be calendered or extruded directly as a film.
  • the resulting film can then be pressed together on both sides with the shell material, either at room temperature, optionally with pressure-sensitive adhesive, or at high temperature, the adhesion of the layers takes place thermally, or optionally by adding a pressure-sensitive adhesive.
  • the obtained mixture may be introduced into a calender or an extruder by means of a multiple die together with the shell material and directly calendered or extruded as a film.
  • the viscoelastic material with the embedded particles in the same production step is co-scaled on both sides with the shell material or coextruded.
  • an expansion gas e.g., pentane
  • pentane e.g., pentane
  • the particles may be mixed into an intumescent preparation (typically a mixture of polyol and isocyanate) which is then expanded.
  • the foaming preparation or its constituents in this case represent precursors of the viscoelastic material.
  • the resulting foam block can then be split, for example with a blade, a hot wire or a water jet, and the resulting layer coalesced with shell material, coextruded or compressed together.
  • the particles may also be coated with the viscoelastic material in an encapsulation process, e.g. with a Microfluidics vide, wherein after the application of the viscoelastic material, a shell material is applied directly.
  • the viscoelastic material or shell material may also be added by a suspension polymerization process, an emulsion polymerization process, a spray drying process, a fluidized bed process, a precipitation process, or a sol-gel process, either in the same step or in subsequent steps. These processes may also involve the crosslinking of one or more layers, either thermally or photolytically.
  • the resulting cells can then be incorporated (eg, mixed or infused) at room temperature or high temperature in a matrix material.
  • this composite material thus obtained may be co-calendered, co-extruded or pressed between shell material layers.
  • Another way of making the cells is to first mix the particles into the viscoelastic material, either at room temperature (typically with stirring, eg, for curing elastomers such as polydimethylsiloxane) or at high temperature (typically with Banbury mixers, calendar rolls or extruders, eg for Thermoplastic polyurethane).
  • the resulting viscoelastic material having particles embedded therein is then ground, which may be dry or wet and either at room temperature or under cryogenic conditions.
  • the mixing can optionally be carried out with a blowing agent which leads to the expansion of the viscoelastic material endothermic or exothermic at high temperature.
  • the cells of a mixture of particles and viscoelastic material may be admixed with an intumescent preparation, which is typically a mixture of polyol and isocyanate.
  • an intumescent preparation typically a mixture of polyol and isocyanate.
  • the mixture is expanded and subsequently ground, which may be dry or wet, either at room temperature or under cryogenic conditions.
  • the cells thus obtained may then be incorporated (e.g., mixed or infused) into a matrix material at room or high temperature.
  • the composite material thus obtained may optionally be co-calendered, coextruded or pressed between shell material layers.
  • the resulting cells which are foamed or unfoamed depending on the variant, can be applied together with a matrix material as a coating or in a coating on a base material, e.g. by spraying or precipitation, and optional subsequent crosslinking or heating step.
  • a matrix material as a coating or in a coating on a base material
  • the coated, cell-containing layer may be covered by another layer, e.g. by spraying or by other coating techniques.
  • FIG. 1 shows a first embodiment of the composite material.
  • FIG. 1 an embodiment of the composite material 10 according to variant a) is shown, which has a sandwich structure with a middle layer and two surrounding outer layers.
  • the middle layer comprises a viscoelastic material 12 in which a plurality of particles 14 are embedded.
  • the particles 14 are in the FIG. 1 example shown evenly distributed in the viscoelastic material 12, but the particles 14 do not form regular structures.
  • the material of the particles 14 has a higher density than the viscoelastic material and also the modulus of elasticity of the particles 14 is greater than the effective modulus of elasticity of the viscoelastic material 12.
  • the two outer layers of the composite material 10 each comprise a shell material 16.
  • the shell material 16 has a greater effective Young's modulus than the viscoelastic material 12, but a smaller effective Young's modulus than the particles 14.
  • Each of the particles 14 forms a mechanical resonator in the composite material 10, the particles 14 representing the oscillating mass of the resonator and the viscoelastic material 12 constituting the spring element.
  • the sheath material 16, which surrounds the viscoelastic material 12, in this case represents a kind of anchor, wherein the particles 14 can perform mechanical vibrations relative to the sheath material 16.
  • Each of the resonators has at least one resonance frequency.
  • the in the FIG. 1 embodiment shown can be performed, for example, as a sound-absorbing or sound-absorbing film by the individual layers of the composite material 10 are designed to be correspondingly thin and flexible. If, on the other hand, at least one of the outer layers is made so thick that it is no longer flexible, the composite material 10 can be designed as a sound-absorbing or sound-absorbing plate.
  • FIG. 2 shows a second embodiment of the composite material.
  • FIG. 2 a second embodiment of the composite material 10 is shown.
  • the viscoelastic material 12 with the particles 14 is enclosed in the interior of cells 20, compare the FIGS. 4 to 6 ,
  • the cells 20 in turn are embedded in a matrix material 24.
  • the composite material 10 is shown in the shape of a cuboid, but the matrix material 24 with the cells 20 accommodated therein can take any desired shape and in particular be processed by means of injection molding or other shaping processes.
  • Each of the cells 20 constitutes one or more resonators in the composite material 10, depending on the number of particles 14 received inside the cell 20.
  • the sound damping effect of the composite 10 is greater due to the local resonances that occur than according to Berger's mass law for a homogeneous material with a basis weight corresponding to that of the composite material 10 is to be expected.
  • FIG. 3 shows the use of the composite material as a coating.
  • FIG. 3 is a base material 32 shown, the sound-absorbing or sound-absorbing properties to be improved.
  • the composite material 10 in the form of a coating 30 is applied to the base material 32.
  • the composite material 10 has according to alternative b) a matrix material 24, in which a plurality of cells 20, compare FIGS. 4 to 6 , is embedded.
  • the matrix material 24 may initially be in a liquid state, with the cells 20 dispersed in the still liquid matrix material 24. After being applied to the base material 32, the matrix material 24 cures so that the composite material 10 forms with its sound-absorbing or sound-absorbing properties.
  • FIG. 4 shows a first variant of a cell.
  • a cell 20 is shown which is in a matrix material 24, compare this Figures 2 and 3 , can be embedded.
  • the cell 20 comprises one or more particles 14, wherein in the in FIG. 4 shown variant exactly one particle 14 is contained in the cell 20.
  • the single particle 14 or the particles 14 are embedded in the viscoelastic material 12.
  • a shell material 22 surrounds the viscoelastic material 12 and closes the cell 20 to the outside.
  • Both the single particle 14 and the entire cell 20 are spherical in this embodiment. However, it is also conceivable to design the particles 14 and / or the surface of the cell 20 irregularly.
  • FIG. 5 shows a second variant of a cell.
  • FIG. 5 a cell 20 is shown which is in a matrix material 24, compare this Figures 2 and 3 , can be embedded.
  • cell 20 corresponds to that already with reference to FIG. 4 cell 20, however, cell 20 has the FIG. 5 no shell material 22 on.
  • the surface of the cell 20 is formed here by the surface of the viscoelastic material 12.
  • FIG. 6 shows a third variant of a cell.
  • FIG. 6 a cell 20 is shown which is in a matrix material 24, compare this Figures 2 and 3 , can be embedded.
  • the FIG. 6 illustrated cell 20 includes the viscoelastic Material 12 in the in FIG. 6 illustrated embodiment, a plurality of particles 14 are embedded.
  • the viscoelastic material 12 is enclosed by the shell material 22, which in this embodiment forms the surface of the cell 20.
  • the particles 14, like the entire cell 20, are irregular in shape.
EP15150827.2A 2015-01-12 2015-01-12 Matériau composite absorbant le son ou à isolation acoustique Withdrawn EP3043346A1 (fr)

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EP15150827.2A EP3043346A1 (fr) 2015-01-12 2015-01-12 Matériau composite absorbant le son ou à isolation acoustique
PCT/EP2016/050438 WO2016113241A1 (fr) 2015-01-12 2016-01-12 Matériau composite amortissant les bruits ou absorbant les bruits
DE112016000315.3T DE112016000315A5 (de) 2015-01-12 2016-01-12 Schalldämpfendes bzw. schallabsorbierendes Verbundmaterial

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WO2020128103A1 (fr) * 2018-12-21 2020-06-25 Metacoustic Panneau acoustiquement isolant
CN112053672A (zh) * 2020-09-07 2020-12-08 西安交通大学 一种粘弹性材料纵向隔板分区水下吸声结构
CN112119452A (zh) * 2018-05-16 2020-12-22 伊戈尔·耶姆里 隔音元件
US11052987B2 (en) * 2018-05-30 2021-07-06 The Boeing Company Integrally damped composite aircraft floor panels

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KR20180109934A (ko) 2016-02-19 2018-10-08 바스프 에스이 폴리아미드 및 첨가제를 포함하는 폴리아미드 조성물
WO2017182314A1 (fr) * 2016-04-18 2017-10-26 Basf Se Dispositif présentant des propriétés de phono-absorption et d'ignifugeage
EP3483467A1 (fr) * 2017-11-14 2019-05-15 Mapei S.p.A. Composition de fluide pour des systèmes conçus pour amortir des sons associés à des vibrations mécaniques
CN113912924A (zh) * 2021-11-05 2022-01-11 杭州老板电器股份有限公司 复合降噪材料及其制备方法、设备壳体和设备

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