WO2018149718A1 - Membrane pour micro haut-parleur - Google Patents

Membrane pour micro haut-parleur Download PDF

Info

Publication number
WO2018149718A1
WO2018149718A1 PCT/EP2018/053143 EP2018053143W WO2018149718A1 WO 2018149718 A1 WO2018149718 A1 WO 2018149718A1 EP 2018053143 W EP2018053143 W EP 2018053143W WO 2018149718 A1 WO2018149718 A1 WO 2018149718A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
sensitive adhesive
composite according
multilayer composite
tan
Prior art date
Application number
PCT/EP2018/053143
Other languages
German (de)
English (en)
Inventor
Nikolay BELOV
Tobias Winkler
Dr. Gero MAATZ
Dr. Michael EGGER
Alexander Herrmann
Original Assignee
Tesa 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 Tesa Se filed Critical Tesa Se
Priority to KR1020197026374A priority Critical patent/KR20190109770A/ko
Priority to EP18703999.5A priority patent/EP3583784A1/fr
Priority to CN201880007310.2A priority patent/CN110226334A/zh
Publication of WO2018149718A1 publication Critical patent/WO2018149718A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/025—Diaphragms comprising polymeric materials

Definitions

  • the invention relates to the technical field of loudspeaker membranes. More specifically, the invention relates to a high internal damping multi-layer composite for making or use as a micro-speaker membrane.
  • micro-speakers The generation of sound in mobile phones and smartphones for the reproduction of speech, ringtones, music, etc. is done by small electro-acoustic transducers, so-called micro-speakers.
  • a loudspeaker diaphragm should generally be stiff and light on the one hand in order to produce a high sound pressure and to cover a wide frequency range, but on the other hand be well damped at the same time to show the smoothest possible frequency response. Since the properties stiff, light and well damped give a constructive contradiction and can not all be fulfilled simultaneously (the stiffer, the worse the damping and vice versa), compromises have to be made in terms of stiffness and damping of the membrane material in each membrane or stiff materials combined with good damping materials.
  • US Pat. No. 7,726,441 B describes a membrane composed of a multilayer composite consisting of two rigid polymer films and a damping adhesive layer lying between these films.
  • US 5,464,659 describes a method of vibration damping an article which provides for the application of a vibration damping material of 5 to 95% acrylic monomer (s) and 95 to 5% silicone adhesive on the article, the sum of the two components being 100%.
  • adhesives are used in the prior art as vibration-damping material, for example in the abovementioned combinations of rigid materials with good damping properties.
  • the films used in the currently marketed multilayer laminates must maintain their high rigidity even at high application temperatures, which is why mainly films made of high-performance plastics with a correspondingly high glass transition temperature are used.
  • the stiff films themselves contribute very little to the damping. This mainly provides the soft intermediate layer, so usually a pressure-sensitive adhesive. It is therefore reasonable to select pressure-sensitive adhesives which have a high loss factor. The loss factor is proportional to the internal damping.
  • Object of the present invention is to provide a speaker diaphragm with good damping properties and high stability - in particular temperature stability - available.
  • the solution to the problem is based on the idea to use a silicone-based pressure-sensitive adhesive with optimized tan ⁇ as an adhesive for the speaker membranes.
  • a first and general object of the invention is a multi-layer composite for the manufacture of or use as a micro-speaker membranes, which in order a) a first cover layer, b) a pressure-sensitive adhesive; and c) comprises a second cover layer; and which is characterized in that the PSA comprises at least one at least partially crosslinked silicone and the maximum value of the ratio of loss modulus (G ") and storage modulus (G ') (tan ⁇ ) of the PSA in the temperature range between - 60 ° C and 170 ° C. is equal to or greater than 0.5.
  • the main constituent of the cover layers is preferably selected independently of one another from the group consisting of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), polyurethane (PU), thermoplastic polyurethane (TPU), polyethylene naphthalate (PEN) , Polyphenylene sulfide (PPS), polyimide (PI), polyphenylsulfone (PPSU), polyethersulfone (PES), polysulfone (PSU), polyetherimide (PEI), polyarylate (PAR), polyetheretherketone (PEEK) and polyaryletherketone (PAEK).
  • PP polypropylene
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PC polycarbonate
  • PU polyurethane
  • TPU thermoplastic polyurethane
  • PEN polyethylene naphthalate
  • PPS Polyphenylene sulfide
  • the cover layers are preferably films. Particularly preferably, the cover layers are each PEEK films.
  • the thickness of the two outer layers of the multilayer composite according to the invention is preferably 1 .mu.m to 50 .mu.m, preferably 2 .mu.m to 40 .mu.m ⁇ , more preferably 3 ⁇ to 15 ⁇ .
  • the two cover layers can also be the same thickness.
  • an intermediate layer of a silicone-based pressure-sensitive adhesive is arranged between the two cover layers.
  • This layer has the function to stably connect the top and bottom cover layers and to damp their vibration.
  • the multilayer composite according to the invention may be limited to the three layers mentioned, but may also have further layers in its structure.
  • a pressure sensitive adhesive Under a PSA or synonymous a pressure sensitive adhesive according to the invention, as common in common usage, a substance understood that - especially at room temperature - permanently sticky and sticky.
  • a characteristic of a pressure-sensitive adhesive is that it can be applied by pressure to a substrate and adhere there, whereby the pressure to be applied and the duration of this pressure are generally not specified.
  • the action will be a short-term minimum pressure that does not exceed a light touch for a brief moment to obtain the adhesion effect. In other cases, a long-term exposure time of high pressure may be necessary.
  • Pressure-sensitive adhesives have special, characteristic viscoelastic properties which lead to permanent tackiness and adhesiveness. Characteristic of them is that when they are mechanically deformed, it comes both to viscous flow processes as well as to build elastic restoring forces. Both processes are in a certain ratio with regard to their respective proportions, depending on the exact composition, the structure and the degree of crosslinking of the pressure-sensitive adhesive as well as on the speed and duration of the deformation and on the temperature.
  • the proportional viscous flow is necessary to achieve adhesion.
  • the viscous components caused by macromolecules with relatively high mobility, allow good wetting and a good flow onto the substrate to be bonded.
  • a high proportion of viscous flow leads to a high tack (also known as tack or Surface tackiness) and thus often also to a high bond strength.
  • Strongly crosslinked systems, crystalline or glassy solidified polymers are usually not or at least only slightly tacky due to the lack of flowable components.
  • the proportional elastic restoring forces are necessary to achieve cohesion. They are caused for example by very long-chained and strongly entangled as well as by physically or chemically crosslinked macromolecules and allow the transmission of forces acting on an adhesive bond forces. They result in an adhesive bond being able to withstand a sustained load acting on it, for example in the form of a permanent shearing load, to a sufficient extent over a relatively long period of time.
  • G ' storage modulus
  • G " loss modulus
  • G " is a measure of the viscous portion of a substance. Both quantities depend on the deformation frequency and the temperature.
  • the sizes can be determined with the help of a rheometer.
  • the material to be examined is subjected to a sinusoidally oscillating shear stress in a plate-and-plate arrangement.
  • shear stress controlled devices the deformation as a function of time and the time lag of this deformation are compared with the introduction of the shear stress measured. This time offset is referred to as the phase angle ⁇ .
  • a substance is generally considered to be pressure-sensitive and is defined as tacky, if at room temperature, here by definition at 23 ° C, in the deformation frequency range of 10 ° to 10 1 rad / sec G 'at least partially in the range of 10 3 to 10 7
  • the maximum value of the quotient of loss modulus (G ") and storage modulus (G ') (tan ⁇ ) of the pressure-sensitive adhesive in the temperature range between -60 ° C and 170 ° C is equal to or greater than 0.8, more preferably greater than 1.0 ,
  • a "silicone” is understood in the general understanding according to a synthetic polymeric compound in which silicon atoms linked via oxygen atoms in a chain or net and the remaining valences of silicon by hydrocarbon radicals (usually methyl groups, more rarely ethyl groups,
  • the term "at least partially crosslinked” means that at least parts of the silicone macromolecules are linked to one another by forming bridging bonds between them. This presupposes the presence of an initially crosslinkable silicone system from which the at least partially crosslinked silicone system is obtained by initiating the crosslinking reaction in whatever manner.
  • the crosslinkable silicone systems include, for example, mixtures of crosslinking catalysts and so-called thermally curable condensation or addition-crosslinking polysiloxanes.
  • the pressure-sensitive adhesive composition is obtainable from an addition-crosslinkable silicone system.
  • Silicone systems based on additions can be hardened by hydrosilylation. They usually include the following components:
  • an alkenylated polydiorganosiloxane especially alkenyl-terminated linear polymers
  • a polyorganohydrogensiloxane crosslinking agent especially alkenyl-terminated linear polymers
  • a hydrosilylation catalyst for example, platinum or platinum compounds, such as, for example, the Karstedt catalyst (a Pt (O) complex compound) have prevailed.
  • the pressure-sensitive adhesive composition is obtainable from a free-radically crosslinkable silicone system.
  • a free-radically crosslinkable silicone system This is usually an organopolysiloxane having alkyl substituents in the chain and no vinyl functionality. Often, these organopolysiloxanes are OH-terminated.
  • the free-radical crosslinking is preferably carried out with peroxides, in particular with BPO or chlorinated BPOs and proceeds via the alkyl groups.
  • the alkyl groups are preferably methyl groups.
  • the pressure-sensitive adhesive composition is obtainable from a radiation-crosslinkable silicone system.
  • a radiation-crosslinkable silicone system for example, photoactive catalysts, so-called photoinitiators, can be used in combination with UV-curable, cationically crosslinking siloxanes based on epoxide and / or vinyl ethers or UV-curable, radically crosslinking siloxanes such as acrylate-modified siloxanes.
  • photoactive catalysts so-called photoinitiators
  • UV-curable, radically crosslinking siloxanes such as acrylate-modified siloxanes.
  • electron beam curable silicone acrylates is possible.
  • Corresponding systems may also contain other additives such as stabilizers or leveling agents.
  • the pressure-sensitive adhesive preferably comprises at least one silicone resin.
  • the at least one silicone resin is preferably selected from MQ, MTQ, TQ, MT and MDT resins. According to the invention, it is also possible for mixtures of different silicone resins to be contained in the pressure-sensitive adhesive, in particular mixtures of the above-mentioned silicone resins. Most preferably, the at least one silicone resin is an MQ resin. MQ silicone resins are readily available and are characterized by very good stability. All silicone resins of the pressure-sensitive adhesive MQ resins are very particularly preferred, if several silicone resins are present in the composition according to the invention.
  • the weight-average molar mass Mw of the at least one silicone resin is preferably 500 - ⁇ 30,000 g / mol.
  • the resin may contain alkenyl groups.
  • Suitable silicone resins are, for example, DC 2-7066 from Dow Corning; MQ Resin VSR6201 by Chenguang Fluoro & Silicone Elastomers Co., Ltd .; MQ-RESIN POWDER 803 TF from Wacker Silicones; SR 545 from Momentive Performance Materials or SilmerVQ9XYL and Silmer Q9XYL from Siltech.
  • the temperature at which the quotient of loss modulus (G ") and storage modulus (G ') (tan ⁇ ) of the PSA reaches its maximum value can be adjusted by varying the resin content
  • the term "silicone resin concentration" in the case where several silicone resins are contained in the pressure-sensitive adhesive composition is understood as meaning the total concentration of silicone resins.
  • the change in the silicone resin concentration preferably takes place within the limits of a total content of silicone resin (s) of from 8 to 80% by weight, based on the total amount of silicones and silicone resins of the composition.
  • Simple test series can be used to produce a mass with optimum, in particular acoustic damping properties, which are most pronounced in the tan ⁇ maximum. Furthermore, it becomes possible to "cut" a previously prepared base recipe very simply by adding an appropriate amount of silicone resin to an expected temperature.
  • the silicone resin (s) and the other constituents listed hitherto may be present in the pressure-sensitive adhesive composition of the multilayer composite according to the invention.
  • Anchorage aids organic and / or inorganic pigments; Fillers such as carbon black, graphite or carbon nanotubes and organic and / or inorganic particles (e.g., polymethyl methacrylate (PMMA), barium sulfate or titanium oxide (TiO 2)).
  • PMMA polymethyl methacrylate
  • TiO 2 titanium oxide
  • the pressure-sensitive adhesive composition in each case independently contains 0.1 to 5 parts by weight of one or more anchoring aids and / or one or more pigments and / or 0.1 to 50 parts by weight of one or more fillers, in each case based on 100 parts by weight of the total Silicone (s), (base polymer (s)) and possibly silicone resin (s).
  • the composition according to the invention is free of any constituents going beyond silicones and silicone resins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention vise à mettre au point une membrane de haut-parleur présentant de bonnes propriétés d'amortissement et une stabilité, en particulier une stabilité thermique, élevée. Ceci est réalisé au moyen d'un composite multicouche destiné à la fabrication de membranes de micro haut-parleurs ou à l'utilisation en tant que membranes de micro haut-parleurs, qui comprend, dans l'ordre : a) une première couche de recouvrement; b) une matière autoadhésive; et c) une deuxième couche de recouvrement. Le composite est caractérisé en ce que la matière autoadhésive comprend au moins une silicone au moins partiellement réticulée et en ce que la valeur maximale du quotient du module de perte (G'') et du module de conservation (tan δ) de la matière autoadhésive est égal ou supérieur à 0,5 dans la plage de température comprise entre -60 °C et 170 °C .
PCT/EP2018/053143 2017-02-17 2018-02-08 Membrane pour micro haut-parleur WO2018149718A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020197026374A KR20190109770A (ko) 2017-02-17 2018-02-08 마이크로-라우드스피커를 위한 멤브레인
EP18703999.5A EP3583784A1 (fr) 2017-02-17 2018-02-08 Membrane pour micro haut-parleur
CN201880007310.2A CN110226334A (zh) 2017-02-17 2018-02-08 用于微型扬声器的膜

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017202622.7A DE102017202622A1 (de) 2017-02-17 2017-02-17 Membran für Mikrolautsprecher
DE102017202622.7 2017-02-17

Publications (1)

Publication Number Publication Date
WO2018149718A1 true WO2018149718A1 (fr) 2018-08-23

Family

ID=61188822

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/053143 WO2018149718A1 (fr) 2017-02-17 2018-02-08 Membrane pour micro haut-parleur

Country Status (6)

Country Link
EP (1) EP3583784A1 (fr)
KR (1) KR20190109770A (fr)
CN (1) CN110226334A (fr)
DE (1) DE102017202622A1 (fr)
TW (1) TW201833289A (fr)
WO (1) WO2018149718A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5464659A (en) 1991-05-23 1995-11-07 Minnesota Mining And Manufacturing Company Silicone/acrylate vibration dampers
US7726441B2 (en) 2005-04-05 2010-06-01 Sony Corporation Acoustic vibratory plate
US20100224437A1 (en) * 2009-03-06 2010-09-09 Emo Labs, Inc. Optically Clear Diaphragm For An Acoustic Transducer And Method For Making Same
DE102012208477A1 (de) * 2012-05-21 2013-11-21 Tesa Se Asymmetrische Mehrschichtmembran für elektroakustische Wandler
DE102014225579A1 (de) * 2014-12-11 2016-06-16 Tesa Se Mehrschicht-Verbund für akustische Membranen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027502A1 (de) * 2008-06-10 2009-12-17 Tesa Se Verfahren zur Herstellung von Releaselinern
KR101353590B1 (ko) * 2012-05-10 2014-01-23 삼본정밀전자(주) 하나의 고분자 필름에서 강성도가 다르게 일체로 성형된 스피커용 진동판
US20150312660A1 (en) 2014-04-29 2015-10-29 Knowles Ipc (M) Sdn. Bhd. Acoustic membrane with asymmetric layer arrangement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5464659A (en) 1991-05-23 1995-11-07 Minnesota Mining And Manufacturing Company Silicone/acrylate vibration dampers
US7726441B2 (en) 2005-04-05 2010-06-01 Sony Corporation Acoustic vibratory plate
US20100224437A1 (en) * 2009-03-06 2010-09-09 Emo Labs, Inc. Optically Clear Diaphragm For An Acoustic Transducer And Method For Making Same
US8189851B2 (en) 2009-03-06 2012-05-29 Emo Labs, Inc. Optically clear diaphragm for an acoustic transducer and method for making same
DE102012208477A1 (de) * 2012-05-21 2013-11-21 Tesa Se Asymmetrische Mehrschichtmembran für elektroakustische Wandler
DE102014225579A1 (de) * 2014-12-11 2016-06-16 Tesa Se Mehrschicht-Verbund für akustische Membranen

Also Published As

Publication number Publication date
KR20190109770A (ko) 2019-09-26
EP3583784A1 (fr) 2019-12-25
DE102017202622A1 (de) 2018-08-23
CN110226334A (zh) 2019-09-10
TW201833289A (zh) 2018-09-16

Similar Documents

Publication Publication Date Title
WO2018149717A1 (fr) Matière autoadhésive à base de silicone amortissant les vibrations
DE3786580T2 (de) Flüssige, härtbare Siloxanzusammensetzungen.
WO2018149720A1 (fr) Matière autoadhésive à base de silicone amortissant les vibrations
US10995248B2 (en) Silicone adhesive composition, adhesive tape, and method for producing adhesive tape
DE68914410T2 (de) Organopolysiloxanzusammensetzung zur Herstellung einer Trennfolie.
DE112009005372T5 (de) Trennmittelmaterialien auf der Basis eines Fluorsilicongemisches
DE60215081T2 (de) Silikonzusammensetzung und antiadhäsive Beschichtung
DE102009011165A1 (de) Haftklebemasse
WO2018149719A1 (fr) Matière autoadhésive à base de silicone amortissant les vibrations
WO2018149718A1 (fr) Membrane pour micro haut-parleur
TW201623541A (zh) 具有潛在交聯劑之高效能有機矽黏合劑
DE102021205464B4 (de) Klebeband mit unvernetzter Silikon-Haftklebmasse und Verwendung
DE102018217567A1 (de) Zusammensetzung für eine Trennbeschichtung, welche einen niedrigen Reibungskoeffizienten und einen geringen Silikonübertrag aufweist
Antosik et al. Influence of Zeolite on the Silicone Pressure-Sensitive Adhesives Properties
EP3884005A1 (fr) Composition pour un revêtement de séparation à faible coefficient de frottement
DE102009011166A1 (de) Herstellung von Trennmaterialien für Haftklebebänder
WO2020104317A1 (fr) Composition pour un revêtement de séparation à faible coefficient de frottement
DE102019204937A1 (de) Verfahren zur Herstellung eines Poly(meth)acrylats
JP2010053287A (ja) 水系シリコーン組成物

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18703999

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20197026374

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2018703999

Country of ref document: EP

Effective date: 20190917