CN112468937B - Laminated composite film and preparation method thereof, vibrating diaphragm and sound production device - Google Patents

Laminated composite film and preparation method thereof, vibrating diaphragm and sound production device Download PDF

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Publication number
CN112468937B
CN112468937B CN202011326066.1A CN202011326066A CN112468937B CN 112468937 B CN112468937 B CN 112468937B CN 202011326066 A CN202011326066 A CN 202011326066A CN 112468937 B CN112468937 B CN 112468937B
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film
layer
laminated composite
film layer
thermoplastic elastomer
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CN112468937A (en
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周厚强
王海峰
李春
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Goertek Inc
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Goertek Inc
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/288—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyketones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/42—Layered products comprising a layer of synthetic resin comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
    • H04R2231/001—Moulding aspects of diaphragm or surround
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a laminated composite film and a preparation method thereof, a vibrating diaphragm and a sound production device, wherein the laminated composite film is formed by laminating a plurality of film layers, the film layers comprise thermoplastic elastomer film layers, at least two film layers are made of different materials, and the chemical resistance of at least one film layer meets the following requirements: when the film layer is soaked in the small molecular organic solvent for 48 hours, the weight change of the film layer is less than 10 percent. The invention aims to improve the swelling resistance of the vibrating diaphragm to glue.

Description

Laminated composite film and preparation method thereof, vibrating diaphragm and sound production device
Technical Field
The invention relates to the technical field of sound generating devices, in particular to the technical field of sound generating device vibrating diaphragms, and particularly relates to a laminated composite film and a preparation method thereof, a vibrating diaphragm and a sound generating device.
Background
The thermoplastic elastomer film has the characteristics of good temperature resistance, excellent rebound resilience, thermoplasticity processing, low cost and the like, so that the vibrating diaphragm in the existing sound generating device is usually the thermoplastic elastomer film. In actual production, the vibrating diaphragm needs to be fixed by using UV glue during assembly, but the UV glue is easy to rapidly swell the thermoplastic elastomer before being cured, so that the performance and the production yield of the vibrating diaphragm are influenced.
Disclosure of Invention
The invention mainly aims to provide a laminated composite film, a preparation method thereof, a vibrating diaphragm and a sound production device, and aims to improve the swelling resistance of the vibrating diaphragm to glue.
In order to achieve the above object, the present invention provides a laminated composite film, which is formed by laminating a plurality of film layers including a thermoplastic elastomer film layer, wherein at least two of the film layers are made of different materials, and chemical resistance of at least one of the film layers satisfies: when the film layer is soaked in the small molecular organic solvent for 48 hours, the weight change of the film layer is less than 10 percent.
Optionally, a plurality of the film layers further comprise an engineering plastic film layer.
Optionally, the thermoplastic elastomer film layer and the engineering plastic film layer are alternately stacked.
Optionally, the plurality of film layers are divided into a plurality of film layer units, each film layer unit comprises a plurality of thermoplastic elastomer film layers, and the material of any two thermoplastic elastomer film layers is different; alternatively, the first and second electrodes may be,
the plurality of film layers are divided into a plurality of film layer units, and each film layer unit comprises at least one thermoplastic elastomer film layer and at least one engineering plastic film layer.
Optionally, the number of the film layers is 4-30000; and/or the presence of a gas in the gas,
the thickness of each film layer is 10-1000 nm; and/or the presence of a gas in the gas,
the thickness of the laminated composite film is 2-150 mu m; and/or the presence of a gas in the gas,
the storage modulus of the laminated composite film is 20-2000 MPa.
Optionally, the material of the thermoplastic elastomer film layer includes one of polystyrene, polyolefin, polybisalkene, polyvinyl chloride, polyurethane, polyester, polyamide, polyorganofluorine and polyorgano thermoplastic elastomers.
Optionally, the engineering plastic film layer is made of one of polyamide, polycarbonate, polyoxymethylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylsulfone, polyethersulfone, polyimide, polyphenylene sulfide, polyarylate, polyphenylene ether, polyaryletherketone, and polyetheretherketone.
To achieve the above object, the present invention also proposes a method for preparing a laminated composite film as described above, comprising the steps of:
extruding a plurality of materials through a plurality of extruders correspondingly to form a plurality of melt extrudates;
converging the plurality of melt extrudates by a collector to form a composite unit;
and forming the composite unit into a laminated composite film through a laminator.
Optionally, the number of the extruders is 2-11; and/or the presence of a gas in the gas,
the number of the laminators is 1-10.
In addition, the invention also provides a diaphragm which comprises the laminated composite film.
Optionally, the diaphragm further includes a first secondary film layer, the first secondary film layer composite unit is stacked on the stacked composite film, and the first secondary film layer includes at least one of a thermoplastic elastomer layer, an engineering plastic layer, a glue film layer, and a rubber layer.
Optionally, the vibrating diaphragm still includes the vice rete of second, the vice rete of second is laminated and is established the range upon range of complex film deviates from on one side of the vice rete of first, the vice rete of second includes at least one deck in elastomer layer, engineering plastic layer, glue film layer and the rubber layer.
Optionally, the material of the elastomer layer comprises one of polystyrene, polyolefin, polybilinene, polyvinyl chloride, polyurethane, polyester, polyamide, poly-organic fluorine and poly-organic silicon thermoplastic elastomer; and/or the presence of a gas in the gas,
the engineering plastic layer is made of one of polyamide, polycarbonate, polyformaldehyde, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylsulfone, polyether sulfone, polyimide, polyphenylene sulfide, polyarylate, polyphenyl ester, polyaryletherketone and polyetheretherketone; and/or the presence of a gas in the gas,
the adhesive film layer is an acrylate layer or a silica gel layer; and/or the presence of a gas in the gas,
the rubber layer is an ethylene propylene rubber layer, an ethylene-acrylate rubber layer, an acrylate rubber layer, a silicone rubber layer, a nitrile rubber layer, a polysulfide rubber layer, a polyurethane rubber layer, a styrene-butadiene rubber layer, a natural rubber layer, a butyl rubber layer, a butadiene rubber layer, a polyisoprene rubber layer or a chloroprene rubber layer.
Furthermore, the invention also provides a sound production device, wherein the vibrating diaphragm of the sound production device is the vibrating diaphragm as described above.
According to the technical scheme provided by the invention, the laminated composite film comprises a plurality of film layers, wherein the film layer with excellent chemical resistance effectively improves the swelling resistance of the laminated composite film; because the micromolecule organic solvent can gradually permeate through the weak point of each film layer, the laminated composite film at least has two film layers with different materials, so that the laminated composite film at least has two film layers with inconsistent weak points, thereby prolonging the permeation path of the micromolecule organic solvent in the laminated composite film and further improving the swelling resistance of the laminated composite film. When the vibrating diaphragm contains this range upon range of complex film, the resistance to swelling of vibrating diaphragm can effectively promote to reduced the vibrating diaphragm and warp the possibility of inefficacy, improved the performance and the production yield of vibrating diaphragm.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view of a first embodiment of a laminated composite film provided by the present invention;
FIG. 2 is a schematic structural view of a second embodiment of a laminated composite film provided by the present invention;
FIG. 3 is a schematic structural view of a third embodiment of a laminated composite film provided by the present invention;
FIG. 4 is a schematic structural view of a fourth embodiment of a laminated composite film provided by the present invention;
FIG. 5 is a schematic view of the laminated composite membrane of FIG. 3 permeated by small molecule chemical species;
fig. 6 is a schematic structural diagram of a diaphragm according to a first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a diaphragm according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a diaphragm according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a diaphragm according to a fourth embodiment of the present invention;
FIG. 10 is a schematic view of a production apparatus for a laminated composite film according to the present invention;
FIG. 11 is a graph showing the change of swelling time versus the number of layers of the laminated composite film shown in FIG. 3;
fig. 12 is a frequency response graph of the diaphragm in fig. 6.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
100 Vibrating diaphragm 11b Second thermoplastic elastomer film layer
10 Laminated composite film 12 Engineering plastic film layer
101 Composite unit 20 First secondary film layer
11 Thermoplastic elastomer film layer 30 Second subsidiary film layer
11a A first thermoplastic elastomer film layer
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The thermoplastic elastomer film has the characteristics of good temperature resistance, excellent rebound resilience, thermoplasticity processing, low cost and the like, so that the diaphragm in the existing sound generating device is usually the thermoplastic elastomer film. In actual production, the vibrating diaphragm needs to be fixed by using UV glue during assembly, but the UV glue is easy to rapidly swell the thermoplastic elastomer before being cured, so that the performance and the production yield of the vibrating diaphragm are influenced.
In view of the above, the present invention provides a laminated composite film 10, and referring to fig. 1 and fig. 2, the laminated composite film 10 is formed by laminating a plurality of film layers, the plurality of film layers includes a thermoplastic elastomer film layer 11, wherein at least two film layers are made of different materials, and chemical resistance of at least one film layer satisfies: when the film layer is soaked in the small molecular organic solvent for 48 hours, the weight change of the film layer is less than 10 percent.
The small molecular organic solvent is hydrocarbon, ether, ester, alcohol, ketone or benzene organic solvent, and the molecular weight of the organic solvent is not more than 10000.
In the technical scheme provided by the invention, the laminated composite film 10 comprises a plurality of film layers, wherein the film layer with excellent chemical resistance effectively improves the swelling resistance of the laminated composite film 10; since the small-molecule organic solvent gradually permeates through the weak point of each film layer, as shown in fig. 5, in the figure, small holes on each film layer represent weak points of the film layer, arrows in the figure mark permeation paths of small-molecule organic solvents, and unlike the mode that the conventional co-extruded film relies on the film layer with strong swelling resistance to improve the swelling resistance, the invention ensures that at least two film layers with inconsistent weak points exist in the laminated composite film 10 by limiting the material of at least two film layers to be different and the chemical resistance of at least one film layer to be excellent, thereby prolonging the permeation path of the small-molecule organic solvent in the laminated composite film 10, further improving the swelling resistance of the laminated composite film 10, as shown in fig. 11, as the number of layers of the laminated composite film 10 increases, the permeation path of the small-molecule organic solvent further increases, and the laminated composite film 10 is more excellent in swelling resistance. When the diaphragm 100 includes the laminated composite film 10, the swelling resistance of the diaphragm 100 is effectively improved, so that the possibility of deformation failure of the diaphragm 100 is reduced, and the performance and production yield of the diaphragm 100 are improved.
The thermoplastic elastomer has good thermal plasticity, is easy to process and has a wider hardness range, and the diaphragm 100 can obtain low resonance frequency by selecting the thermoplastic elastomer as a film material, so that the acoustic performance of the diaphragm is improved. The thermoplastic elastomer molecules are composed of hard segments and soft segments, wherein the hard segments provide mechanical properties and the soft segments enhance resilience. Referring to fig. 1, in an embodiment of the present invention, at least one of the plurality of layers is a thermoplastic elastomer layer 11, so that the laminated composite film 10 has good acoustic performance.
The plurality of film layers may be made of different types of materials, either entirely or partially. Specifically, when there are a plurality of thermoplastic elastomer film layers 11, at least two thermoplastic elastomer film layers 11 with different materials are present in the plurality of thermoplastic elastomer film layers 11, for example, referring to fig. 1, the material of the first thermoplastic elastomer film layer 11a is a polystyrene-based thermoplastic elastomer, and the material of the second thermoplastic elastomer film layer 11b is a polyorganosiloxane-based thermoplastic elastomer, so that the weak points of the two layers are not distributed correspondingly, thereby extending the permeation path of the small-molecule organic solvent in the laminated composite film 10 and further improving the swelling resistance of the laminated composite film 10. Referring to fig. 2, in another embodiment, the plurality of film layers further include an engineering plastic film layer 12, and the swelling resistance of the elastomer film can be improved by using the characteristic that the engineering plastic has good barrier property against the small molecule organic solvent, and in addition, because the engineering plastic and the thermoplastic elastomer have different weak point distributions, the engineering plastic film layer 12 and the thermoplastic elastomer film layer 11 are stacked in this embodiment, so that the weak point distributions of the plurality of film layers in the stacked composite film are not corresponding, thereby extending the permeation path of the small molecule organic solvent in the stacked composite film 10, and further improving the swelling resistance of the stacked composite film 10. Specifically, at least one engineering plastic film layer 12 is provided, and when a plurality of engineering plastic film layers 12 are provided, the materials of the engineering plastic film layers 12 may be all the same or all the different, or may be partially different, which is not limited in the present invention.
In specific implementation, the laminated composite film 10 is formed by extruding, converging and laminating a plurality of film layer materials, and the plurality of film layer materials are converged to form a composite unit 101. Based on this, in the present embodiment, the laminated composite film is divided into a plurality of composite units 101. In an embodiment, each film layer unit 101 includes a plurality of the thermoplastic elastomer film layers 11, and the material of any two thermoplastic elastomer film layers 11 is different, so that the distribution of weak points of each film layer in the film layer unit 101 is different, which greatly prolongs the permeation path of the small molecule organic solvent in the laminated composite film 10, and effectively improves the swelling resistance of the laminated composite film 10. In another embodiment, the film layer unit 101 includes at least one thermoplastic elastomer film layer 11 and at least one engineering plastic film layer 12, so as to not only extend the permeation path of the small molecule organic solvent in the laminated composite film 10, but also enable the laminated composite film 10 to have the high barrier property of the engineering plastic, and further improve the swelling resistance of the laminated composite film 10.
Wherein, the material of the thermoplastic elastomer film layer 11 comprises one of polystyrene, polyolefin, polybilinene, polyvinyl chloride, polyurethane, polyester, polyamide, poly organic fluorine and poly organic silicon thermoplastic elastomer; the engineering plastic film layer 12 is made of one of polyamide, polycarbonate, polyformaldehyde, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylsulfone, polyethersulfone, polyimide, polyphenylene sulfide, polyarylate, polybenzoate, polyaryletherketone and polyetheretherketone.
In one embodiment, the number of layers of the film layer constituting the composite film 10 is 4 to 30000, which not only prolongs the permeation path of the small-molecule organic solvent and ensures the acoustic performance of the composite film 10, but also avoids the excessive load on the production process, and the permeation path of the small-molecule organic solvent is further lengthened with the increase of the number of layers, so that the swelling resistance of the laminated composite film is better.
The composite membrane 10 is used as the diaphragm 100 of the sound generating device, and in order to optimize the acoustic performance of the composite membrane 10 and improve the low-frequency sensitivity of the diaphragm 100, in another embodiment, the thickness of each membrane layer is 10-1000 nm. The composite film formed by the co-extrusion process needs to block the permeation of chemical molecules by a film layer with strong swelling resistance, but the thickness of the composite film is larger due to the structure of the co-extrusion film, and in order to ensure the blocking property, the film layer with strong swelling resistance must be positioned at the outer side of the composite film and has enough thickness to play a good blocking role; this range upon range of compound film 10 adopts the range upon range of mode shaping after the multimaterial fuse-element converges for its compound unit 101 integrated into one piece, and the barrier properties is better, and in addition the thickness of its rete is at the nanometer level, makes the rete that chemical resistance is excellent also can play fine barrier effect at compound unit 101 or the middle part of range upon range of compound film 10, in addition, the structure of this range upon range of compound film 10 makes it promote the resistance to swelling based on the infiltration route of extension micromolecule organic solvent, has further relaxed the restriction to the rete range order and the thickness of the rete that chemical resistance is excellent.
In consideration of the limitation of the difficulty of the production process and the requirement for the acoustic performance of the laminated composite membrane 10, the thickness of the laminated composite membrane 10 is preferably 2 to 150 μm, and within this thickness range, on the one hand, the thickness uniformity of the laminated composite membrane 10 can be ensured, and on the other hand, the resonance frequency (F) of the diaphragm 100 formed by the laminated composite membrane 10 can be avoided0) Too high, the low frequency sensitivity decreases.
In order to meet the requirements of the resonant frequency and the sensitivity of the diaphragm 100, the storage modulus of the laminated composite film 10 is 20-2000 MPa. F for satisfying the vibrating diaphragm 100 product when the storage modulus is lower than 20MPa0It is required that the thickness of the laminated composite film 10 is increased, thereby causing an increase in the weight of the diaphragm 100 and a decrease in the sensitivity of the intermediate frequency; f of the diaphragm 100 when the modulus exceeds 2000MPa0Too high, and thus the low frequency sensitivity of the diaphragm 100 is too low.
In addition, the present invention also provides a method for producing the laminated composite film 10, which is used for producing the laminated composite film 10. The method of manufacturing the laminated composite film 10 includes the steps of:
in step S10, a plurality of materials are extruded through a plurality of extruders, respectively, to form a plurality of molten extrudates.
The different materials are respectively melted and plasticized by an extruder to form a plurality of melt extrusion products. The material is a raw material for preparing a single film layer, for example, the laminated composite film 10 includes a plurality of composite units 101, each composite unit 101 is formed by laminating two thermoplastic elastomer film layers 11 of different materials, wherein one thermoplastic elastomer film layer 11 is made of an ethylene thermoplastic elastomer, and the other thermoplastic elastomer film layer 11 is made of an amide thermoplastic elastomer, and in the preparation process, the two ethylene thermoplastic elastomers and the amide thermoplastic elastomers are respectively extruded to form two molten extrudates. In this embodiment, a plurality of extruders are connected in parallel.
Step S20, the plurality of molten extrudates are merged via the combiner to form the composite unit 101.
In actual production, the discharge ports of the plurality of extruders are connected with the feed port of the junction station, so that a plurality of melt extrudates processed by the plurality of extruders enter the junction station to be combined to form the compound unit 101.
In step S30, the composite unit 101 is formed into the laminated composite film 10 by a laminator.
In this embodiment, the composite unit 101 is molded into the laminated composite film 10 by a molding process. The specific method of the molding treatment may be cooling molding.
Specifically, at the low reaches of converging the ware, set up at least one stackers for the product that converges through the ware of converging gets into the stackers and laminates compound, because the stackers can be cut into the product that converges into the lot and stack after the lot, converge the product and handle through the stackers, can make the rete number increase by times, thereby improved production efficiency greatly. In this embodiment, one or more laminators may be provided according to actual requirements, and when a plurality of laminators are provided, the plurality of laminators are sequentially connected in series. In actual production, the number of laminators is usually two or three by one, and taking a two-layer structure laminator (capable of laminating after cutting the merged product into two parts) as an example, when the number of extruders is n and the number of laminators is m, the number of layers of the finally formed composite film 10 can reach n × 2mLayers, as shown in fig. 10, the production apparatus can produce the composite film 10 with up to 3 x 2 layers596 layers. Optionally, the number of the extruders is 2-11; the number of the laminators is 1-10.
In addition, the present invention further provides a diaphragm 100, where the diaphragm 100 includes the laminated composite film 10 as described above, and the laminated composite film 10 has good swelling resistance, so that deformation and failure due to glue infiltration during an assembly process are avoided, and acoustic performance and production yield are ensured.
The diaphragm 100 may be formed of a single laminated composite film 10 as shown in fig. 6, or may be formed by laminating the laminated composite film 10 and another film layer as shown in fig. 7 to 9. In addition, the diaphragm 100 may have a single-layer structure or a multi-layer structure, and when the diaphragm 100 has a single-layer structure, the diaphragm 100 is formed by laminating the composite films 10; when the diaphragm 100 has a multi-layer structure, the diaphragm 100 includes at least one laminated composite film 10. Optionally, the number of layers of the diaphragm 100 is 1 to 5.
Specifically, in one embodiment, the diaphragm 100 further includes a first secondary membrane layer 20. The first sub-film layer 20 is stacked on one side of the laminated composite film 10, and the first sub-film layer 20 may be a thermoplastic elastomer layer, an engineering plastic layer, an adhesive film layer, or a rubber layer. Wherein the material of the thermoplastic elastomer layer comprises one of polystyrene, polyolefin, polybilinene, polyvinyl chloride, polyurethane, polyester, polyamide, poly-organic fluorine and poly-organic silicon thermoplastic elastomer; the engineering plastic layer is made of one of polyamide, polycarbonate, polyformaldehyde, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylsulfone, polyether sulfone, polyimide, polyphenylene sulfide, polyarylate, polyphenyl ester, polyaryletherketone and polyetheretherketone; the adhesive film layer is an acrylate layer or a silica gel layer; the rubber layer is ethylene propylene rubber layer, ethylene-acrylate rubber layer, silicone rubber layer, nitrile rubber layer, polysulfide rubber layer, polyurethane rubber layer, styrene-butadiene rubber layer, natural rubber layer, butyl rubber layer, butadiene rubber layer, polyisoprene rubber layer or chloroprene rubber layer.
In another embodiment, the diaphragm 100 further includes a second auxiliary film layer 30, the second auxiliary film layer 30 is stacked on a side of the laminated composite film 10 away from the first auxiliary film layer 20, and the second auxiliary film layer 30 may be a thermoplastic elastomer layer, an engineering plastic layer, a glue film layer, or a rubber layer. Wherein the material of the thermoplastic elastomer layer comprises one of polystyrene, polyolefin, polybilinene, polyvinyl chloride, polyurethane, polyester, polyamide, poly-organic fluorine and poly-organic silicon thermoplastic elastomer; the engineering plastic layer is made of one of polyamide, polycarbonate, polyformaldehyde, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylsulfone, polyether sulfone, polyimide, polyphenylene sulfide, polyarylate, polyphenyl ester, polyaryletherketone and polyetheretherketone; the adhesive film layer is an acrylate layer or a silica gel layer; the rubber layer is ethylene propylene rubber layer, ethylene-acrylate rubber layer, silicone rubber layer, nitrile rubber layer, polysulfide rubber layer, polyurethane rubber layer, styrene-butadiene rubber layer, natural rubber layer, butyl rubber layer, butadiene rubber layer, polyisoprene rubber layer or chloroprene rubber layer.
It should be noted that, in actual production, the adhesive film layer is located in the middle layer of the diaphragm 100.
In the preparation of the diaphragm 100, a plurality of film layers may be sequentially stacked by using a hot pressing or gluing method, etc., according to the properties of the film layers.
In addition, the present invention further provides a sound generating device, where the sound generating device includes a diaphragm 100, and the specific structure of the diaphragm 100 refers to the above embodiments. Since the sound generating device provided by the invention adopts all technical schemes of all the embodiments, all the beneficial effects brought by the technical schemes of the embodiments are at least achieved, and are not repeated herein.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
Example 1
Referring to fig. 1, the number of layers of the laminated composite film 10 is 4, and the film layer structure is: first thermoplastic elastomer film layer 11 a/second thermoplastic elastomer film layer 11 b/first thermoplastic elastomer film layer 11 a/second thermoplastic elastomer film layer 11 b. The first thermoplastic elastomer film layer 11a and the second thermoplastic elastomer film layer 11b are made of styrene thermoplastic elastomer and olefin thermoplastic elastomer in sequence.
During preparation, respectively melting and plasticizing the styrene thermoplastic elastomer and the olefin thermoplastic elastomer by using an extruder to form two melt extrudates; and (3) after the two kinds of melt extrusion materials enter a confluence device to be converged, laminating and compounding the two kinds of melt extrusion materials through a laminator, and cooling and forming to obtain the laminated composite film 10 with the thickness of 2 mu m and the storage modulus of 35MPa, wherein the thicknesses of four film layers of the laminated composite film 10 are all 500 nm.
Example 2
Referring to fig. 2, the number of layers of the composite film 10 is 4, and the structure of the film layers is: thermoplastic elastomer film layer 11/engineering plastic film layer 12/thermoplastic elastomer film layer 11/engineering plastic film layer 12. Wherein, the thermoplastic elastomer film layer 11 is made of polyurethane thermoplastic elastomer and has a thickness of 1000 nm; the engineering plastic film layer 12 is made of polyamide and has a thickness of 1000 nm.
When in preparation, the polyurethane thermoplastic elastomer and the polyamide are respectively melted and plasticized by an extruder to form two melt extrudates; and (3) allowing the two molten extrudates to enter a confluence device for confluence, laminating and compounding the two molten extrudates by a laminator to form a compound, and cooling and forming the compound to obtain the laminated composite film 10 with the thickness of 4 mu m and the storage modulus of 950 MPa.
Example 3
Referring to fig. 3, the number of layers of the composite film 10 is 8, and the structure of the film layers is: engineering plastic film layer 12/thermoplastic elastomer film layer 11/engineering plastic film layer 12/thermoplastic elastomer film layer 11. Wherein, the thermoplastic elastomer film layer 11 is made of an amide thermoplastic elastomer and has a thickness of 800 nm; the engineering plastic film layer 12 is made of polyether sulfone and has a thickness of 900 nm.
During preparation, the amide thermoplastic elastomer and the polyether sulfone are respectively melted and plasticized by an extruder to form two melt extrudates; and (3) allowing the two molten extrudates to enter a confluence device for confluence, laminating and compounding the two molten extrudates by two laminators to form a compound, and cooling and forming the compound to obtain the laminated composite film 10 with the thickness of 6.8 mu m and the storage modulus of 1600 MPa.
Example 4
Referring to fig. 4, the number of layers of the composite film 10 is 18, and the composite film is formed by sequentially and repeatedly laminating a first thermoplastic elastomer film layer 11a, a second thermoplastic elastomer film layer 11b, and an engineering plastic film layer 12. Wherein, the thermoplastic elastomer film layer 11a is made of an organic silicon thermoplastic elastomer and has a thickness of 1000 nm; the thermoplastic elastomer film layer 11b is made of an organic fluorine thermoplastic elastomer and has a thickness of 1000 nm; the engineering plastic film layer 12 is made of polyether-ether-ketone and has a thickness of 1000 nm.
During preparation, respectively melting and plasticizing the organic silicon thermoplastic elastomer, the organic fluorine thermoplastic elastomer and the polyether-ether-ketone by using an extruder to form three kinds of melt extrudates; and (3) allowing the three molten extrudates to enter a confluence device for confluence, laminating and compounding the three molten extrudates by two laminators to form a compound, and cooling and forming the compound to obtain the laminated composite film 10 with the thickness of 18 mu m and the storage modulus of 970 MPa.
Example 5
Referring to fig. 6, the diaphragm 100 of the present embodiment is formed of a laminated composite film 10, and the film layer structure of the laminated composite film 10 is the same as that of the laminated composite film 10 shown in embodiment 3.
Example 6
Referring to fig. 7, the film structure of the diaphragm 100 is: the composite film 10/first sub-film layer 20 a/first sub-film layer 20b are laminated. Wherein the film layer structure of the laminated composite film 10 is the same as that of the laminated composite film 10 shown in example 3; the first auxiliary film layer 20a is made of ethylene propylene rubber; the material of the first auxiliary film layer 20b is a vinyl chloride-based thermoplastic elastomer. The diaphragm 100 is formed by sequentially laminating a laminated composite film 10, a first auxiliary film layer 20a, and a first auxiliary film layer 20b by means of hot press molding.
Example 7
Referring to fig. 8, the film structure of the diaphragm 100 is: first sub-film layer 20/laminated composite film 10/second sub-film layer 30 a/second sub-film layer 30 b. Wherein the film layer structure of the laminated composite film 10 is the same as that of the laminated composite film 10 shown in example 3; the first secondary film layer 20 is made of ethylene thermoplastic elastomer; the second auxiliary film layer 30a is made of polybutylene terephthalate; the second sub-film layer 30b is made of silicon rubber. The diaphragm 100 is formed by sequentially stacking a first auxiliary film layer 20, a stacked composite film 10, a second auxiliary film layer 30a, and a second auxiliary film layer 30b by means of hot press molding.
Example 8
Referring to fig. 9, the film structure of the diaphragm 100 is: laminated composite film 10/first secondary film layer 20/laminated composite film 10. Wherein the film layer structure of the laminated composite film 10 is the same as that of the laminated composite film 10 shown in example 3; the first secondary film layer 20 is made of acrylate glue. The diaphragm 100 is formed by sequentially laminating a laminated composite film 10, a first auxiliary film layer 20, and the laminated composite film 10 by means of air pressure molding.
Comparative example
The amide-based thermoplastic elastomer is melted and plasticized, and then cooled and molded into an elastomer film.
In order to understand the performance advantages of the laminated composite film 10 and the diaphragm 100 provided by the present invention, the chemical resistance and the production yield of the laminated composite film 10 of example 3 and the elastomer film of the comparative example were examined, and the results are shown in table 1.
Table 1 effect of UV glue on swelling and production yield of common elastomeric films and composite films 10
The diaphragm 100 is formed Swelling time/s of UV glue Product yield/%)
Elastomeric films 2-4 85
Composite membrane 10 ＞40 99
As can be seen from the above table, the swelling time and the product yield of the laminated composite film 10 are significantly higher than those of the elastomer film, which indicates that the laminated composite film 10 provided by the present invention has good swelling resistance, and when used as the diaphragm 100, the laminated composite film can improve the production yield of the diaphragm 100.
Further, an elastomer film of a comparative example was used as the diaphragm 100, and the performance thereof was compared with that of the diaphragm 100 of example 5, and fig. 12 is a frequency response curve of two diaphragms 100. As can be seen from fig. 12, the medium frequency sensitivity of the diaphragm 100 of the present invention is higher than that of the elastomer diaphragm 100, because the high hardness thermoplastic elastomer film layer 11 or the engineering plastic film layer 12 in the laminated composite film 10 can increase the modulus of the laminated composite film 10, and reduce the overall thickness and weight of the diaphragm 100, thereby increasing the medium frequency sensitivity of the laminated composite film 10, which indicates that the diaphragm 100 of the present invention has good acoustic performance.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (13)

1. A laminated composite film, which is formed by laminating a plurality of film layers including a thermoplastic elastomer film layer, wherein at least two of the film layers are made of different materials, and chemical resistance of at least one of the film layers is satisfied: when the film layer is soaked in a small molecular organic solvent for 48 hours, the weight variation of the film layer is less than 10 percent;
the plurality of film layers are divided into a plurality of film layer units, and each film layer unit comprises a plurality of thermoplastic elastomer film layers; or, the plurality of film layers are divided into a plurality of film layer units, and each film layer unit comprises at least one thermoplastic elastomer film layer and at least one engineering plastic film layer.
2. The laminated composite film of claim 1, wherein the plurality of film layers further comprises an engineering plastic film layer.
3. The laminated composite film of claim 2, wherein the thermoplastic elastomer film layer and the engineering plastic film layer are in an alternating lamination arrangement.
4. The laminated composite film according to claim 1, wherein the number of the film layers is 4 to 30000; and/or the presence of a gas in the gas,
the thickness of each film layer is 10-1000 nm; and/or the presence of a gas in the gas,
the thickness of the laminated composite film is 2-150 mu m; and/or the presence of a gas in the gas,
the storage modulus of the laminated composite film is 20-2000 MPa.
5. The laminated composite film according to claim 1, wherein the material of the thermoplastic elastomer film layer comprises one of polystyrene, polyolefin, polybisane, polyvinyl chloride, polyurethane, polyester, polyamide, polyorganofluorine and polyorgano thermoplastic elastomers.
6. A laminated composite film according to any one of claims 1 to 3, wherein the engineering plastic film layer is made of one of polyamide, polycarbonate, polyoxymethylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylsulfone, polyethersulfone, polyimide, polyphenylene sulfide, polyarylate, polyphenylene ether, polyaryletherketone, and polyetheretherketone.
7. A method for producing a laminated composite film according to any one of claims 1 to 6, comprising the steps of:
extruding a plurality of film layer materials through a plurality of extruders correspondingly to form a plurality of melt extrudates;
converging the plurality of melt extrudates by a collector to form a composite unit;
and forming the composite unit into a laminated composite film through a laminator.
8. The method of producing a laminated composite film according to claim 7, wherein the number of the extruders is 2 to 11; and/or the presence of a gas in the gas,
the number of the laminators is 1-10.
9. A diaphragm comprising the laminated composite film according to any one of claims 1 to 6.
10. The diaphragm of claim 9, further comprising a first secondary film layer stacked on the composite laminated film, wherein the first secondary film layer comprises at least one of a thermoplastic elastomer layer, an engineering plastic layer, a rubber layer, and a rubber layer.
11. The diaphragm of claim 10, further comprising a second sub-film layer stacked on a side of the laminated composite film facing away from the first sub-film layer, the second sub-film layer including at least one of a thermoplastic elastomer layer, an engineering plastic layer, a glue film layer, and a rubber layer.
12. The diaphragm according to claim 10 or 11, wherein the material of the thermoplastic elastomer layer includes one of polystyrene, polyolefin, polybisane, polyvinyl chloride, polyurethane, polyester, polyamide, polyorganofluorine, and polyorgano thermoplastic elastomer; and/or the presence of a gas in the gas,
the engineering plastic layer is made of one of polyamide, polycarbonate, polyformaldehyde, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylsulfone, polyether sulfone, polyimide, polyphenylene sulfide, polyarylate, polyphenyl ester, polyaryletherketone and polyetheretherketone; and/or the presence of a gas in the gas,
the adhesive film layer is an acrylate layer or a silica gel layer; and/or the presence of a gas in the gas,
the rubber layer is an ethylene propylene rubber layer, an ethylene-acrylate rubber layer, an acrylate rubber layer, a silicone rubber layer, a nitrile rubber layer, a polysulfide rubber layer, a polyurethane rubber layer, a styrene butadiene rubber layer, a natural rubber layer, a butyl rubber layer, a butadiene rubber layer, a polyisoprene rubber layer or a chloroprene rubber layer.
13. A sound-generating device, wherein the diaphragm of the sound-generating device is the diaphragm according to any one of claims 9 to 12.
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