CN111935606B - Composite diaphragm, preparation method thereof and sound production device - Google Patents
Composite diaphragm, preparation method thereof and sound production device Download PDFInfo
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- CN111935606B CN111935606B CN202011010815.XA CN202011010815A CN111935606B CN 111935606 B CN111935606 B CN 111935606B CN 202011010815 A CN202011010815 A CN 202011010815A CN 111935606 B CN111935606 B CN 111935606B
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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
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- 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
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/042—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
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- 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
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
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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
- 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
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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
- 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
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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
- 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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- Acoustics & Sound (AREA)
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Abstract
The invention discloses a composite vibrating diaphragm, a preparation method thereof and a sound production device. The composite vibrating diaphragm provided by the invention comprises a polyacrylate copolymer vulcanized rubber film layer and an elastomer film layer, and the polyacrylate copolymer vulcanized rubber film layer is compounded with the elastomer film layer, so that the temperature resistance of the composite vibrating diaphragm is obviously improved, the damping property and the bonding property of the composite vibrating diaphragm are also improved, the application range of the composite vibrating diaphragm is widened, and the problems that the vibrating diaphragm is easy to crack and collapse after high power, large amplitude or large voltage and the like are solved.
Description
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 specifically relates to a composite vibrating diaphragm, a preparation method thereof and a sound generating device.
Background
All be provided with the vibrating diaphragm in the current sound generating mechanism structure, this vibrating diaphragm often adopts the compound vibrating diaphragm of multilayer, and especially the compound vibrating diaphragm of elastomer and glued membrane is more common, and the structure and the simple process of this compound vibrating diaphragm have higher damping nature, resilience. Along with the improvement of high power, waterproof and high sound quality requirements, the composite vibrating diaphragm of the elastomer and the rubber film structure is popularized and applied in a sound generating device, in particular to the field of speakers.
The composite diaphragm of the elastomer and the rubber film is usually formed by compounding and sticking an elastomer film layer and a rubber film layer together, the rubber film is usually an acrylic rubber film or a silicone film, but no matter which rubber film is adopted, the bonding force with the elastomer film layer is not large enough, the lamination is easy after the bonding, and the reliability is poor; and the temperature resistance of the adhesive film layer is poor, so that the overall temperature resistance of the composite diaphragm is reduced, and along with high power of the loudspeaker, the problems that the diaphragm is easy to crack, damage, collapse and the like exist under high heat and strong vibration transmitted by the voice coil.
Disclosure of Invention
The invention mainly aims to provide a composite vibrating diaphragm, a preparation method thereof and a sound production device, and aims to improve the performance of the elastomer and adhesive film composite vibrating diaphragm when the elastomer and adhesive film composite vibrating diaphragm is used as the vibrating diaphragm of the sound production device.
In order to achieve the purpose, the invention provides a composite diaphragm which comprises a polyacrylate copolymer vulcanized rubber film layer and a first elastomer film layer, wherein the first elastomer film layer is arranged on one side of the polyacrylate copolymer vulcanized rubber film layer.
Optionally, the thickness of the polyacrylate copolymer vulcanized rubber film layer is 10-95 μm; and/or the thickness of the first elastomer film layer is 10-90 mu m.
Optionally, the thickness of the polyacrylate copolymer vulcanized rubber film layer is 15-80 μm; and/or the thickness of the first elastomer film layer is 11-70 μm.
Optionally, the Shore hardness of the polyacrylate copolymer vulcanized rubber film layer is 30-75A.
Optionally, the material of the first elastomer film layer includes at least one of styrene, olefin, diene, vinyl chloride, urethane, ester, amide, organic fluorine, silicone, and ethylene thermoplastic elastomers.
Optionally, the composite diaphragm further includes a second elastomer film layer, and the second elastomer film layer is disposed on one side of the polyacrylate copolymer vulcanized rubber film layer far away from the first elastomer film layer.
Optionally, the thickness of the second elastomer film layer is 10-90 μm.
Optionally, the thickness of the second elastomer film layer is 11-70 μm.
Optionally, the material of the second elastomer film layer includes at least one of styrene, olefin, diene, vinyl chloride, urethane, ester, amide, organic fluorine, silicone, and ethylene thermoplastic elastomers.
In order to achieve the above object, the present invention further provides a method for preparing a composite diaphragm, where the composite diaphragm includes a polyacrylate copolymer vulcanized rubber film layer and a first elastomer film layer, the first elastomer film layer is disposed on one side of the polyacrylate copolymer vulcanized rubber film layer, and the method for preparing the composite diaphragm includes the following steps:
compounding the polyacrylic ester copolymer vulcanized rubber film which is not crosslinked or partially crosslinked with the first elastomer film, and molding the compound vibrating diaphragm in a pressure or compression molding manner, wherein the polyacrylic ester copolymer vulcanized rubber film is crosslinked and molded in the pressure or compression molding manner.
Furthermore, the invention also provides a sound production device, wherein the vibrating diaphragm of the sound production device is the composite vibrating diaphragm.
According to the technical scheme provided by the invention, the composite vibrating diaphragm comprises a polyacrylate copolymer vulcanized rubber film layer and an elastomer film layer, and the polyacrylate copolymer vulcanized rubber film layer is compounded with the elastomer film layer, so that the temperature resistance of the composite vibrating diaphragm is obviously improved, the damping property and the bonding property of the composite vibrating diaphragm are also improved, the application range of the composite vibrating diaphragm is widened, and the problems that the vibrating diaphragm is easy to crack and collapse after high power, large amplitude or large voltage and the like are solved.
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 diagram of an embodiment of a composite diaphragm provided in the present invention;
fig. 2 is a schematic structural diagram of another embodiment of a composite diaphragm provided in the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Composite diaphragm | 20 | A first |
| 10 | Polyacrylate copolymer vulcanized |
30 | Second elastomeric 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 for explaining the relative position relationship between the components, the motion situation, and the like under a certain posture (as shown in the drawing), and if the certain 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 relating to "first", "second", etc. in the embodiments 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 to implicitly indicate 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 composite diaphragm of the elastomer and the rubber film is usually formed by compounding and sticking an elastomer film layer and a rubber film layer together, the rubber film is usually an acrylic rubber film or a silicone film, but no matter which rubber film is adopted, the bonding force with the elastomer film layer is not large enough, the lamination is easy after the bonding, and the reliability is poor; and the temperature resistance of the adhesive film layer is poor, so that the overall temperature resistance of the composite diaphragm is reduced, and along with high power of the loudspeaker, the problems that the diaphragm is easy to crack, damage, collapse and the like exist under high heat and strong vibration transmitted by the voice coil.
In view of this, the present invention improves the design of the elastomer and film composite diaphragm, and uses the polyacrylate copolymer vulcanized rubber (ACM) as the film, so as to improve the temperature resistance of the elastomer and film composite diaphragm, and fig. 1 shows an embodiment of the composite diaphragm provided by the present invention. Referring to fig. 1, in the present embodiment, the composite diaphragm 100 includes a polyacrylate copolymer vulcanized rubber film layer 10 and a first elastomer film layer 20, and the first elastomer film layer 20 is disposed on one side of the polyacrylate copolymer vulcanized rubber film layer 10.
In the technical scheme provided by the invention, the composite diaphragm 100 comprises a polyacrylate copolymer vulcanized rubber film layer 10 and an elastomer film layer, and the polyacrylate copolymer vulcanized rubber film layer 10 and the elastomer film layer are compounded, so that the temperature resistance of the composite diaphragm is obviously improved, the damping property and the bonding property of the composite diaphragm are also improved, the application range of the composite diaphragm is widened, and the problems that the diaphragm is easy to crack and collapse after high power, large amplitude or high voltage and the like are solved. The loudspeaker adopting the composite vibrating diaphragm 100 provided by the invention as the vibrating diaphragm not only has the characteristics of large amplitude, ultra-dynamic and ultra-balanced characteristics, but also can improve the tone quality by reducing the noise generated by the vibration of the mobile phone while obviously improving the volume, better realize the stereo effect, meet the experience requirements of users on extreme sound, and simultaneously meet the tolerance degree of products in different environments and the stability of the products.
In the composite diaphragm 100 provided by the present invention, the material of the polyacrylate copolymer vulcanized rubber film layer 10 is polyacrylate copolymer vulcanized rubber, which is formed by taking alkyl acrylate as a main polymerization monomer and crosslinking polymerization of the main polymerization monomer, and the molecular structural formula is:
wherein, in the structural formula: r can be at least one of alkyl main monomer, ethyl main monomer, methyl main monomer and n-butyl main monomer; x is COO (CH)2)2OCH3-a CN comonomer; y is-COOH crosslinking functional group, -OCOCH2Cl crosslinking functional group, -OCH2CH2At least one of a Cl crosslinking functional group, an epoxy crosslinking functional group, and an unsaturated olefin group; m, n and a are natural numbers.
Further, the material of the polyacrylate copolymer vulcanized rubber film layer 10 further includes a filler, a vulcanizing agent and an auxiliary agent, wherein the filler may be at least one of carbon black, silica, silicate and carbonate; the vulcanizing agent is at least one of a trimercapto-s-triazine vulcanizing system, polyamine, organic acid, ammonium salt, organic acid ammonium salt, dithiocarbamate, imidazole/anhydride, isocyanuric acid/quaternary salt, sulfur/accelerator and peroxide; the auxiliary agent comprises an anti-aging agent, an accelerator, an activator, a plasticizer, a tackifier, a colorant and an internal mold release agent. Furthermore, the addition amount of the vulcanizing agent is preferably 0.5-5 parts based on 100 parts of polyacrylate copolymer vulcanized rubber, and when the addition amount of the vulcanizing agent is less than 0.5 part, the problems of low vulcanization efficiency, influence on production efficiency and cost improvement, low crosslinking degree and insufficient rigidity of a vibrating diaphragm exist, so that the product is easy to deform in the vibration process to cause poor product performance; when the addition amount of the vulcanizing agent is more than 5 parts, the problems of excessively high crosslinking degree, poor toughness and easy film breaking of the product exist. In addition, the amount of the filler is not more than 50 parts, and the addition amount of the auxiliary agent is not more than 15 parts. The coloring agent is mainly added according to the product requirements so as to increase the individuality of the product and improve the competitiveness.
The molding processing method of the composite diaphragm 100 is as follows: the polyacrylate copolymer vulcanized rubber film layer 10 is formed into a film by adopting a calendaring or coating process, then is attached to the first elastomer film layer 20, and is formed into the composite diaphragm through air pressure or compression molding. Wherein, the polyacrylate copolymer vulcanized rubber film layer 10 adopts a low-temperature drying mode in the drying process, so that crosslinking or semi-chemical crosslinking is not generated, and in the process of forming the composite diaphragm by air pressure or compression molding of the composite film, since the polyacrylate copolymer vulcanized rubber film layer 10 is in an uncrosslinked or semi-crosslinked state, therefore, the composite diaphragm is easier to be soaked with the elastomer film layer, and the polyacrylic ester copolymer vulcanized rubber film layer 10 is vulcanized, crosslinked and shaped in the composite diaphragm forming process, so that the bonding force between the polyacrylic ester copolymer vulcanized rubber film layer 10 and the elastomer film layer is further increased, the stripping force of the composite diaphragm 100 is improved by 0.3-6 times, the bonding performance of the composite diaphragm is improved, and the problem that the existing elastomer composite diaphragm is easy to layer after being bonded is solved.
The polyacrylate copolymer vulcanized rubber film has the main functions of improving the smoothness, the damping property and the bonding effect of the vibrating diaphragm, when the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is too small, the damping of the composite vibrating diaphragm is small, so that the total harmonic distortion and the listening performance are poor, and when the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is too large, the weight of the vibrating diaphragm is too large, so that the sensitivity is poor. Further, the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is more preferably 15-80 μm, and the composite diaphragm has more excellent comprehensive performance within the thickness range.
Further, when the hardness of the polyacrylate copolymer vulcanized rubber film layer 10 is too small, the diaphragm has poor rigidity and is easy to generate polarization, resulting in poor THD (Total Harmonic Distortion); when the hardness of the polyacrylate copolymer vulcanized rubber film layer 10 is too high, the elongation at break of the polyacrylate copolymer vulcanized rubber film layer 10 is reduced, and the film is easily broken in low-temperature reliability verification, so that the product fails, therefore, in the embodiment, the shore hardness of the polyacrylate copolymer vulcanized rubber film layer 10 is preferably 30-75A, so that the rigidity of the polyacrylate copolymer vulcanized rubber film layer 10 is relatively proper, and the problems of poor THD caused by polarization and easy film breaking caused by reduction of the elongation at break are avoided.
In this embodiment, the thickness of the first elastomer film layer 20 is 10 to 90 μm, and within this thickness range, the resilience, temperature resistance, modulus, rigidity, and other properties of the composite diaphragm 100 can be well balanced. Further, as a preferred embodiment of the present invention, the thickness of the first elastomer film layer 20 is 11 to 70 μm, and the composite diaphragm 100 has better overall properties such as thickness, weight, resilience, temperature resistance, modulus, and rigidity.
The material of the first elastomer film layer 20 may be any thermoplastic elastomer material, and specifically, the material of the first elastomer film layer 20 includes at least one of styrene, olefin, diene, vinyl chloride, urethane, ester, amide, organic fluorine, silicone and ethylene thermoplastic elastomers. The material of the first elastomer film layer 20 may be one of the above thermoplastic elastomers, or may be a composite material formed by compounding two or more kinds of films formed by the above two or more kinds of thermoplastic elastomers, when different types of thermoplastic elastomers are selected, the improvement effect of the first elastomer film layer 20 on the composite diaphragm is different, and the first elastomer film layer 20 may be selected according to actual use requirements. In this embodiment, the first elastomer film layer 20 is preferably a single-layer film made of any one of the above thermoplastic elastomers, which is beneficial to saving raw material cost while ensuring that the first elastomer film layer 20 has a better improvement effect on the polyacrylate copolymer vulcanized rubber diaphragm. In order to characterize the performance advantages of the composite diaphragm 100 provided in this embodiment, taking the material of the first elastomer film layer 20 as TPEE (thermoplastic polyester elastomer) as an example (the obtained composite diaphragm is abbreviated as TPEE/ACM composite diaphragm), the peeling force, modulus and reliability of the composite diaphragm 100 are tested and compared, and details are described in the following analysis.
The composite diaphragm 100 provided by the present invention at least includes a polyacrylate copolymer vulcanized rubber film layer 10 and an elastomer film layer, in an embodiment provided in fig. 1, the composite diaphragm 100 includes a polyacrylate copolymer vulcanized rubber film layer 10 and a first elastomer film layer 20, in other embodiments of the present invention, the composite diaphragm 100 may also be configured as a multilayer structure with 3 layers or more than 3 layers, when the composite diaphragm is configured as a multilayer structure with 3 layers or more than 3 layers, preferably, the polyacrylate copolymer vulcanized rubber film layer 10 is used as an intermediate layer of the composite diaphragm, and the molding process of the composite diaphragm may also adopt the above-mentioned air pressure or compression molding manner. Referring to fig. 2, in another embodiment of the composite diaphragm 100 provided by the present invention, the composite diaphragm 100 further includes a second elastomer film layer 30, and the second elastomer film layer 30 is disposed on a side of the polyacrylate copolymer vulcanized rubber film layer 10 away from the first elastomer film layer 20. By the arrangement of the second elastomer film layer 30, the resilience of the composite diaphragm is further improved.
Considering the rigidity, resilience and other properties of the polyacrylate copolymer vulcanized rubber and the elastomer diaphragm, the thickness of the second elastomer film layer 30 is set to be 10-90 μm, and the composite diaphragm 100 has good resilience, modulus, rigidity, heat resistance and other properties within the thickness range. Further, as a preferred embodiment of the present invention, the thickness of the second elastomer film layer 30 is 11 to 70 μm, and the composite diaphragm 100 has more excellent overall performance.
The material of the second elastomer film layer 30 may be any thermoplastic elastomer material, and specifically, the material of the second elastomer film layer 30 includes at least one of styrene, olefin, diene, vinyl chloride, urethane, ester, amide, organic fluorine, silicone, and ethylene thermoplastic elastomers. The material of the second elastomer film layer 30 may be one of the above thermoplastic elastomers, or may be a composite material formed by combining two or more kinds of membranes formed by two or more kinds of elastomers, when different types of elastomers are selected, the improvement effect of the second elastomer film layer 30 on the composite diaphragm is different, and the second elastomer film layer 30 may be selected according to actual use requirements. In this embodiment, the second elastomer film layer 30 is preferably a single-layer film made of any one of the elastomers, which is beneficial to saving raw material cost while ensuring that the second elastomer film layer 30 has a better improvement effect on the polyacrylate copolymer vulcanized rubber diaphragm. In addition, the material of the second elastomer film layer 30 may be the same as or different from the material of the first elastomer film layer 20, and both of them fall within the protection scope of the composite diaphragm 100 provided in the present invention. In order to facilitate characterization of performance advantages of the composite diaphragm 100 provided in this embodiment, here, TPEE is selected as an example for both the first elastomer film layer 20 and the second elastomer film layer 30 (the obtained composite diaphragm is abbreviated as TPEE/ACM/TPEE composite diaphragm), and relevant tests and comparisons are performed on the peeling force, modulus and reliability of the composite diaphragm 100, where polyacrylate copolymer vulcanized rubber single-layer diaphragm (abbreviated as ACM single-layer diaphragm), TPEE/acrylic film/TPEE composite diaphragm are used as comparative examples, and various performance test results of the diaphragm are as follows: table 1 shows peel force test data of a material tape composed of the TPEE/ACM/TPEE composite diaphragm and the TPEE/acrylic film/TPEE composite diaphragm, table 2 shows modulus test data of a material tape composed of the ACM single-layer diaphragm, the TPEE/ACM composite diaphragm and the TPEE/ACM/TPEE composite diaphragm, respectively, and table 3 shows reliability test data of the TPEE/ACM/TPEE composite diaphragm and the TPEE/acrylic film/TPEE composite diaphragm.
TABLE 1 composite diaphragm peeling force test data
| Composite diaphragm | Thickness/mum | Peel force (g/25 mm) |
| TPEE/acrylic acid adhesive film/TPEE composite vibrating diaphragm | 15/15/15 | 105 |
| TPEE/ACM/TPEE composite diaphragm | 15/15/15 | 225 |
TABLE 2 modulus test data
| Material belt assembly | Thickness/mum | Storage modulus/MPa |
| ACM monolayer | 50 | 8 |
| TPEE/ACM composite layer | 15/30 | 75 |
| TPEE/ACM/TPEE composite layer | 15/15/15 | 125 |
TABLE 3 composite diaphragm reliability test data
| Composite diaphragm | High power life reliability test |
| TPEE/acrylic acid glue film/TPEE composite vibrating diaphragm | The membrane rupture rate is 96 percent |
| TPEE/ACM/TPEE composite diaphragm | The film breaking rate is 0 percent |
As can be seen from the data in table 1, the peeling force of the composite diaphragm 100 provided in the embodiment of the present invention is significantly increased; as can be seen from the data in table 2, the modulus of the composite diaphragm 100 provided in the present invention is also significantly improved; further combining the data in table 3, it can be seen that, after the conventional elastomer composite diaphragm vibrates under a long-time high-temperature condition, the diaphragm breaking rate is as high as 96%, but the composite diaphragm 100 provided in the embodiment of the present invention does not break after vibrating under a long-time high-temperature condition, which indicates that the composite diaphragm 100 provided in the present invention solves the problems of poor heat resistance and easy diaphragm breaking in a high-temperature reliability test of the conventional elastomer composite diaphragm.
In an embodiment of the preparation method of the composite diaphragm provided by the present invention, the composite diaphragm 100 includes a polyacrylate copolymer vulcanized rubber film layer 10 and a first elastomer film layer 20, the first elastomer film layer 20 is disposed on one side of the polyacrylate copolymer vulcanized rubber film layer 10, and the preparation method of the composite diaphragm includes the following steps:
compounding the polyacrylate copolymer vulcanized rubber film which is not crosslinked or partially crosslinked with the first elastomer film, forming the composite vibrating diaphragm in an air pressure or compression molding manner, and crosslinking and shaping the polyacrylate copolymer vulcanized rubber film in the air pressure or compression molding manner. Thus, before the composite diaphragm 100 is subjected to air pressure or compression molding, the polyacrylate copolymer vulcanized rubber film is in a non-crosslinked or semi-chemically crosslinked state, and then chemical crosslinking and shaping are completed in the process of compounding the composite diaphragm, so that the adhesive force between the polyacrylate copolymer vulcanized rubber film and the first engineering plastic film is higher.
In another embodiment of the preparation method of the composite diaphragm, when the composite diaphragm 100 includes the polyacrylate copolymer vulcanized rubber film layer 10, the first elastomer film layer 20 and the second elastomer film layer 30, and the first elastomer film layer 20 and the second elastomer film layer 30 are respectively disposed on two sides of the polyacrylate copolymer vulcanized rubber film layer 10, the same method can be adopted in the preparation step of the composite diaphragm, that is, the non-crosslinked or partially crosslinked polyacrylate copolymer vulcanized rubber film is compounded with the first elastomer film and the second elastomer film, and is molded into the composite diaphragm by means of air pressure or compression molding, and in the air pressure or compression molding, the polyacrylate copolymer vulcanized rubber film is crosslinked and shaped.
In addition, the invention further provides a sound production device, the sound production device includes a vibrating diaphragm, the vibrating diaphragm is a composite vibrating diaphragm 100, and the specific structure of the composite vibrating diaphragm 100 refers to the above embodiment. 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
The composite diaphragm 100 comprises a polyacrylate copolymer vulcanized rubber film layer 10 and a first elastomer film layer 20 (shown in fig. 1), wherein the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is 10 μm, the shore hardness is 75A, and the first elastomer film layer 20 is made of TPEE and has a thickness of 10 μm; the composite diaphragm 100 is prepared by air pressure molding, and the polyacrylate copolymer vulcanized rubber film layer 10 is vulcanized, crosslinked and shaped in the air pressure molding.
Example 2
The composite diaphragm 100 comprises a polyacrylate copolymer vulcanized rubber film layer 10 and a first elastomer film layer 20 (shown in fig. 1), wherein the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is 95 μm, the shore hardness is 30A, and the first elastomer film layer 20 is made of TPEE and has a thickness of 90 μm; the composite diaphragm 100 is prepared by air pressure molding, and the polyacrylate copolymer vulcanized rubber film layer 10 is vulcanized, crosslinked and shaped in the air pressure molding.
Example 3
The composite diaphragm 100 comprises a polyacrylate copolymer vulcanized rubber film layer 10, a first elastomer film layer 20 and a second elastomer film layer 30 (as shown in fig. 2), wherein the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is 15 μm, the shore hardness is 60A, the first elastomer film layer 20 is made of TPEE, the thickness is 11 μm, and the obtained second elastomer film layer 30 is made of TPEE and the thickness is 11 μm; the composite diaphragm 100 is prepared by air pressure molding, and the polyacrylate copolymer vulcanized rubber film layer 10 is vulcanized, crosslinked and shaped in the air pressure molding.
Example 4
The composite diaphragm 100 comprises a polyacrylate copolymer vulcanized rubber film layer 10, a first elastomer film layer 20 and a second elastomer film layer 30 (as shown in fig. 2), wherein the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is 80 μm, the shore hardness is 40A, the first elastomer film layer 20 is made of TPEE, the thickness is 70 μm, and the obtained second elastomer film layer 30 is made of TPEE and has the thickness of 70 μm; the composite diaphragm 100 is prepared by air pressure molding, and the polyacrylate copolymer vulcanized rubber film layer 10 is vulcanized, crosslinked and shaped in the air pressure molding.
Example 5
The composite diaphragm 100 comprises a polyacrylate copolymer vulcanized rubber film layer 10, a first elastomer film layer 20 and a second elastomer film layer 30 (as shown in fig. 2), wherein the thickness of the polyacrylate copolymer vulcanized rubber film layer 10 is 50 μm, the shore hardness is 50A, the first elastomer film layer 20 is made of TPEE and has a thickness of 40 μm, and the obtained second elastomer film layer 30 is made of TPEE and has a thickness of 40 μm; the composite diaphragm 100 is prepared by air pressure molding, and the polyacrylate copolymer vulcanized rubber film layer 10 is vulcanized, crosslinked and shaped in the air pressure molding.
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 (9)
1. The preparation method of the composite diaphragm is characterized by comprising a polyacrylate copolymer vulcanized rubber film layer and a first elastomer film layer, wherein the first elastomer film layer is arranged on one side of the polyacrylate copolymer vulcanized rubber film layer; the thickness of the polyacrylate copolymer vulcanized rubber film layer is 10-95 microns, and the Shore hardness of the polyacrylate copolymer vulcanized rubber film layer is 30-75A;
the molding mode of the composite diaphragm is as follows:
forming a polyacrylate copolymer vulcanized rubber film by a calendaring or coating process on the polyacrylate copolymer vulcanized rubber;
forming an uncrosslinked or partially crosslinked polyacrylate copolymer vulcanized rubber film layer with a layered structure by adopting a low-temperature drying mode;
attaching an uncrosslinked or partially crosslinked polyacrylate copolymer vulcanized rubber film layer to a first elastomer film layer, and forming into a composite vibrating diaphragm in an air pressure or mould pressing mode;
and the polyacrylate copolymer vulcanized rubber film layer is crosslinked and shaped in the air pressure or mould pressing process.
2. The method of claim 1, wherein the first elastomer film layer has a thickness of 10 to 90 μm.
3. The method for preparing a composite diaphragm according to claim 2, wherein the thickness of the polyacrylate copolymer vulcanized rubber film layer is 15 to 80 μm; and/or the thickness of the first elastomer film layer is 11-70 μm.
4. The method of manufacturing a composite diaphragm according to claim 1, wherein the material of the first elastomer film layer includes at least one of styrene, olefin, diene, vinyl chloride, urethane, ester, amide, organic fluorine, silicone, and ethylene thermoplastic elastomers.
5. The method of claim 1, wherein the composite diaphragm further includes a second elastomer film layer, and the second elastomer film layer is disposed on a side of the polyacrylate copolymer vulcanized rubber film layer away from the first elastomer film layer.
6. The method for preparing a composite diaphragm according to claim 5, wherein the thickness of the second elastomer film layer is 10 to 90 μm.
7. The method for preparing a composite diaphragm according to claim 6, wherein the thickness of the second elastomer film layer is 11 to 70 μm.
8. The method of claim 5, wherein the second elastomer film layer is made of at least one of styrene, olefin, diene, vinyl chloride, urethane, ester, amide, organic fluorine, silicone, and ethylene thermoplastic elastomers.
9. A sound-producing device, characterized in that the sound-producing device is a composite diaphragm formed by the method for manufacturing a composite diaphragm according to any one of claims 1 to 8.
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| CN106792377A (en) * | 2017-01-23 | 2017-05-31 | 瑞声科技（南京）有限公司 | Vibrating diaphragm and microphone device |
| CN109218924A (en) * | 2018-08-20 | 2019-01-15 | 歌尔股份有限公司 | Vibrating diaphragm, sounding device and its assemble method for sounding device |
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| CN101253204B (en) * | 2005-06-30 | 2012-05-23 | 纳幕尔杜邦公司 | Ethylene/methyl acrylate/cure site copolymers and compounds and vulcanizates thereof |
| US10626550B2 (en) * | 2015-11-24 | 2020-04-21 | Bose Corporation | Water-resistant composition |
| CN110708635B (en) * | 2019-10-31 | 2020-11-24 | 歌尔股份有限公司 | Sound generating device's vibrating diaphragm and sound generating device |
| CN211089958U (en) * | 2020-01-03 | 2020-07-24 | 歌尔科技有限公司 | A electrically conductive vibrating diaphragm and sound generating mechanism for sound generating mechanism |
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| CN106792377A (en) * | 2017-01-23 | 2017-05-31 | 瑞声科技（南京）有限公司 | Vibrating diaphragm and microphone device |
| CN109218924A (en) * | 2018-08-20 | 2019-01-15 | 歌尔股份有限公司 | Vibrating diaphragm, sounding device and its assemble method for sounding device |
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