CN114071326B - Waterproof sound-transmitting membrane assembly - Google Patents
Waterproof sound-transmitting membrane assembly Download PDFInfo
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- CN114071326B CN114071326B CN202010774387.1A CN202010774387A CN114071326B CN 114071326 B CN114071326 B CN 114071326B CN 202010774387 A CN202010774387 A CN 202010774387A CN 114071326 B CN114071326 B CN 114071326B
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- 239000012528 membrane Substances 0.000 title claims abstract description 254
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000012790 adhesive layer Substances 0.000 claims abstract description 23
- 230000000903 blocking effect Effects 0.000 claims abstract description 22
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 15
- 230000004048 modification Effects 0.000 claims abstract description 13
- 238000012986 modification Methods 0.000 claims abstract description 13
- 229920006254 polymer film Polymers 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims description 118
- 230000001070 adhesive effect Effects 0.000 claims description 118
- 238000012360 testing method Methods 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 7
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- 230000000694 effects Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 18
- 230000000712 assembly Effects 0.000 description 11
- 238000000429 assembly Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 9
- 230000006872 improvement Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000002390 adhesive tape Substances 0.000 description 6
- -1 Polytetrafluoroethylene Polymers 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
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- 239000007788 liquid Substances 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
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- 239000005871 repellent Substances 0.000 description 3
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- NZZFYRREKKOMAT-UHFFFAOYSA-N diiodomethane Chemical compound ICI NZZFYRREKKOMAT-UHFFFAOYSA-N 0.000 description 2
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- 229910052731 fluorine Inorganic materials 0.000 description 2
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
-
- 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
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
The invention provides a waterproof sound-transmitting membrane component, which comprises a single-layer waterproof sound-transmitting membrane and an annular adhesive layer positioned at the edge of the waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is prepared from a polymer film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 2000-8000MPa; the sound blocking amount is 1.5-6dB in the audio frequency range of 100-10000 Hz; the surface energy of the waterproof sound-transmitting membrane is less than 50mN/m; the waterproof sound-transmitting membrane component has high sound-transmitting performance and high waterproof performance; the waterproof sound-transmitting membrane component has the water pressure resistance of more than 1MPa, can be normally used under water of 100 meters, and is particularly suitable for electronic equipment which needs to be used under water of 100 meters; in addition, the waterproof sound-transmitting membrane component also has higher dustproof effect, and is beneficial to prolonging the service life of electronic equipment.
Description
Technical Field
The invention relates to the technical field of membrane materials, in particular to a waterproof sound-transmitting membrane assembly.
Background
The waterproof sound-transmitting membrane is a membrane material with high waterproof and high sound-transmitting properties, is generally arranged on a port of electronic equipment and is used as a barrier for preventing dust, water or other liquid from entering, and meanwhile, the transmission property, the integrity or the quality of sound are not obviously reduced; the normal use of the electronic equipment is greatly ensured, and the service life of the electronic equipment is prolonged. For example, patent document 1, japanese patent application laid-open No. 2003-503991, describes a porous film obtained by stretching a sheet made of Polytetrafluoroethylene (PTFE); in japanese patent application laid-open No. 2004-83811, patent document 2 also proposes a waterproof sound-transmitting film as a laminate comprising a plastic film and a support; patent document 3, japanese patent application laid-open No. 2010-4397, also proposes an acoustic member having a waterproof filter (waterproof sound-transmitting film) attached via an adhesive layer so as to cover sound-transmitting holes of a case.
In addition, chinese patent application No. 201080018126.1 discloses an acoustic impedance protective cover assembly that includes a first diffusion layer of porous polymeric material; a second water repellent layer comprising a porous polymeric material; wherein a spacing of at least 0.25mm is provided between the first diffusion layer and the second water repellent layer such that the first diffusion layer does not contact the second water repellent layer, the acoustic impedance of the acoustic impedance cover being less than 500 rayls; the acoustic resistance cover component not only has lower acoustic resistance, but also can fully prevent water, dust or other liquid from entering, and ensures the normal use of electronic equipment.
The patent No. CN201480063126.1 discloses a waterproof sound-transmitting membrane and a waterproof sound-transmitting structure using the same, and also discloses a waterproof sound-transmitting membrane having a sound-transmitting region composed of a single-layer polytetrafluoroethylene porous membrane with a permeability of 2cm 3 /cm 2 The waterproof sound-transmitting membrane has better ventilation sound-transmitting performance, and also has certain waterproof performance, wherein the waterproof pressure is more than 3kPa, the Harmonic Distortion (THD) is less than 60.2%.
The waterproof sound-transmitting films are porous films, the films contain more holes, and sound is correspondingly transmitted through the holes and then the waterproof sound-transmitting films, so that sound loss is reduced, and sound transmission quality is ensured; but the existence of the holes can make the waterproof performance of the waterproof sound-transmitting membrane worse; even though the waterproof sound-transmitting membrane is subjected to hydrophobic treatment, the waterproof property of the waterproof sound-transmitting membrane prepared by the porous membrane is still general, so that the development of the waterproof sound-transmitting membrane is limited to a certain extent; the surface of the compact membrane is not provided with holes, so that the waterproof performance is good; however, the waterproof sound-transmitting membrane on the market is hardly made of a compact membrane, because the traditional compact membrane has poor sound-transmitting performance, the requirement of the waterproof sound-transmitting membrane on high sound-transmitting performance cannot be met, and how to use the compact membrane to prepare the waterproof sound-transmitting membrane with high sound-transmitting performance is one of the hot spots of the research of the membrane materials at present.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a waterproof sound-transmitting membrane assembly, which comprises a waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is made of a compact membrane and has high sound-transmitting property and high water resistance, so that the normal application of electronic equipment is ensured.
In order to achieve the above purpose, the present invention provides the following technical solutions: the waterproof sound-transmitting membrane component comprises a single-layer waterproof sound-transmitting membrane and an annular adhesive layer positioned at the edge of the waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is prepared from a polymer film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 2000-8000MPa;
the sound blocking amount of the waterproof sound-transmitting membrane is 1.5-6dB in the audio frequency range of 100-10000 Hz;
the surface energy of the waterproof sound-transmitting membrane is less than 50mN/m.
The waterproof sound-transmitting membrane component comprises the waterproof sound-transmitting membrane and the annular adhesive layer, wherein the annular adhesive layer has strong viscosity, so that the waterproof sound-transmitting membrane is tightly attached to the shell and acoustic components such as a microphone or a loudspeaker, and separation is not easy to occur; the waterproof sound-transmitting membrane is made of a single-layer polymer film instead of a composite membrane, so that a composite process is not needed in preparation, and the preparation is easier; the meaning of the compact membrane in the invention means that after the compact membrane is enlarged by 5 ten thousand times under a microscope, the surface of the waterproof sound-transmitting membrane still has no holes, and at the moment, the surface of the waterproof sound-transmitting membrane can be considered to have no holes; because the waterproof sound-transmitting membrane is a compact membrane, and the surface of the waterproof sound-transmitting membrane is not provided with any holes, sound cannot pass through the waterproof sound-transmitting membrane through the holes; in the invention, the transmission of sound is caused by the vibration of the waterproof sound-transmitting membrane, in order to ensure the quality of sound transmission, the waterproof sound-transmitting membrane needs to have a proper elastic modulus, because if the elastic modulus of the waterproof sound-transmitting membrane is too high, the rigidity of the membrane material is higher, the reflection ratio of the membrane to the sound is increased, and the proportion of the transmitted sound is reduced; if the elastic modulus of the waterproof sound-transmitting membrane is too low, the sound response performance of the membrane to a high-frequency section is poor, and the sound loss of the high-frequency section is increased; according to the waterproof sound-transmitting membrane, the elastic modulus is 2000-8000MPa, so that the waterproof sound-transmitting membrane has high sound-transmitting performance and small sound loss;
when sound passes through an object, certain loss occurs; this loss amount is actually also referred to as the sound blocking amount of the object, and the larger the sound blocking amount of the object is, the larger the sound loss is, and the smaller the sound blocking amount of the object is, the smaller the sound loss is; the method for testing the object sound blocking amount comprises the following steps: and (3) punching the object to be tested into a wafer with the diameter of 5.0mm, concentric stacking the punched material to be tested and an annular double faced adhesive tape with the outer diameter of 5.0mm and the inner diameter of 1.7mm, wherein the thickness of the double faced adhesive tape is 0.15mm, and finally, attaching the double faced adhesive tape to a microphone test board with a sound outlet with the depth of 1mm and the diameter of 0.8mm, thereby simulating the Louis SPA1687LR5H for microphone winnowing. And a manual mouth is arranged at a position 2cm away from the microphone tool. The analog microphone and the manual mouth are connected with an audio analyzer of model Audio Precision x and 525. The Audio test software of the Audio presentation is utilized to make the artificial mouth emit sound with the sound pressure level of 94dBSPL at the frequency of 100Hz-10000 Hz. Collecting response signals of the microphone end under the conditions that the test assembly is attached to the surface of the microphone tool and the test assembly is not attached to the surface of the microphone tool, and making difference to finally obtain the sound blocking quantity and the distortion degree increment of the corresponding object; the sound blocking amount of the waterproof sound-transmitting membrane is 1.5-6dB in the audio frequency range of 100-10000Hz, and the sound blocking amount is very small, so that the waterproof sound-transmitting membrane assembly has very strong sound-transmitting performance, the sound transmission is not influenced, and the sound quality is ensured; overcomes the defects of poor sound permeability and overlarge sound loss of the traditional compact membrane.
The waterproof sound-transmitting membrane is prepared from a polymer film subjected to hydrophobic modification treatment, and the polymer film is a compact film, and has better waterproof performance compared with a common porous film, but the waterproof performance of the polymer film is still to be enhanced when the electronic equipment works at a deeper underwater position; in order to further improve the waterproof performance of the polymer film, the polymer film is subjected to hydrophobic treatment, and a specific treatment method is to bond a polymer with strong hydrophobicity to the surface and the inside of the filter membrane through a physical or chemical method; the polymer with strong hydrophobicity comprises polymers of organic chemicals containing elements such as silicon, fluorine and the like, such as various emulsions of fluorine-containing compounds. The physical or chemical method may be any known mature process, and commonly used methods include coating, grafting, deposition, etc. For example, the microporous filter membrane is immersed in an emulsion having superhydrophobicity for 1-10 min, and then baked at 30-80 ℃ for 1-20 min and 100-250 ℃ for 1-10 min, respectively. After hydrophobic treatment, the waterproof performance of the polymer film can be further improved, so that a waterproof sound-transmitting film with high waterproof performance is prepared; the surface energy of the water is 72.8mN/m, if the membrane isThe surface energy of the waterproof sound-transmitting membrane is lower than 72.8mN/m, so that the membrane has certain waterproof performance, and the surface energy of the waterproof sound-transmitting membrane is lower than 50mN/m, so that the waterproof sound-transmitting membrane has strong waterproof performance, and the electronic equipment can normally work underwater and is not easily influenced by water. The surface energy test method comprises the following steps: spreading the film to be tested on a horizontal table, dripping 4uL of water on the surface of the film, measuring the included angle between the water drop outline and the film plane by using an imager, repeating for 3 times, and calculating the average value of the water contact angle to be theta 1 . Dripping diiodomethane, measuring contact angle, repeating for 3 times, calculating average value of diiodomethane contact angle, and recording as theta 2 The method comprises the steps of carrying out a first treatment on the surface of the By solving the following Owens-Went equation, the dispersion force gamma of the film to be measured can be obtained 1 And a polar force gamma 2 . According to Fowkes theory, the surface energy of the film to be measured is equal to the sum of its dispersive and polar forces.
As a further improvement of the present invention, the water pressure resistance of the waterproof sound-transmitting membrane module measured according to the method B (high water pressure method) of the waterproof test method specified in JISL1092 is 1MPa or more.
During the water pressure resistance test, the assembly is attached to the surface of a tool provided with a water outlet hole with the diameter of 1mm, and the annular adhesive part of the assembly is pressed by a clamp; the water pressure was increased to 1MPa at a rate of 20kPa/s, and then it was observed whether the front and side surfaces of the module were leaking water. If no water leakage exists, judging that the component can pass a water pressure resistance test of 1MPa for 30 min; through waterproof performance tests, the waterproof sound-transmitting membrane assembly has the advantages that the water pressure resistance is higher than 1MP, the water pressure is high when the water pressure is 1MPa is 100 meters under water, namely, when the water pressure is 100 meters under water, the waterproof sound-transmitting membrane assembly can still normally play the role of waterproof sound transmission, the waterproof sound-transmitting membrane cannot swell due to the water pressure and the like, and therefore the waterproof sound-transmitting membrane assembly cannot be normally used, and therefore the waterproof sound-transmitting membrane assembly is particularly suitable for electronic equipment which needs to normally work under water of 100 meters.
As a further improvement of the invention, after the waterproof sound-transmitting membrane is subjected to a circulating waterproof test under the water pressure of 1MPa, the sound blocking amount of the waterproof sound-transmitting membrane is 1.5-6dB in the audio frequency range of 100-10000 Hz; the harmonic distortion increment of the waterproof sound-transmitting membrane under the water pressure of 1MPa is at most 20%;
under the action of 1MPa water pressure, the relative deformation of the waterproof sound-transmitting membrane is not more than the elastic limit relative deformation S of the waterproof sound-transmitting membrane, and the elastic limit relative deformation S of the waterproof sound-transmitting membrane is not more than 1%.
And (3) cyclic waterproof test: based on the water pressure resistance test, after the first round of water pressure resistance test is carried out, reducing the water pressure to zero at the speed of 20kPa/s until the pressure difference at two ends of the membrane is zero, increasing the water pressure at the speed of 20kPa/s again, and repeating the water pressure resistance test process, wherein the judgment standard is consistent with the water pressure resistance test; after the cyclic waterproof test, the sound blocking amount of the waterproof sound-transmitting membrane is basically unchanged, and the harmonic distortion increment is smaller, so that the waterproof sound-transmitting membrane has high waterproof performance; although the waterproof sound-transmitting membrane has high elastic modulus, under the action of 1MPa water pressure, the waterproof sound-transmitting membrane can also generate certain elastic deformation, and the deformation is required to be smaller than the elastic limit relative deformation S of the waterproof sound-transmitting membrane, so that the waterproof sound-transmitting membrane can normally play a role in waterproof sound transmission under the action of 1MPa water pressure.
As a further improvement of the invention, the waterproof sound-permeable membrane is resistant to a 1MPa waterproof test of at least 10 cycles.
At present, most waterproof sound-transmitting membranes are porous membranes, and the pore diameter of the porous membranes is gradually increased under the action of water pressure, so that the original stronger waterproof effect is lost, and the service life of the existing waterproof sound-transmitting membranes is short; the waterproof sound-transmitting membrane provided by the invention is a compact membrane, and has no holes on the surface, so that the waterproof sound-transmitting membrane can withstand a 1MPa waterproof test of at least 10 cycles, and has long service life and high economic value.
As a further improvement of the invention, the waterproof sound-transmitting membrane has an interception efficiency of at least 99% for impurity particles having a diameter of at least 0.1 um.
At present, most waterproof sound-transmitting membranes are porous membranes, holes with certain aperture are formed in the porous membranes, although the aperture is smaller, water molecules cannot enter the porous membranes, impurity particles with smaller diameters still can penetrate through the waterproof sound-transmitting membranes and enter the electronic equipment through the holes, and a plurality of precise objects are contained in the electronic equipment (particularly some electronic equipment for detection), so that the existence of the impurity particles can greatly influence the precision of the objects, thereby influencing the effective work of the electronic equipment and shortening the service life of the electronic equipment; the waterproof sound-transmitting membrane is a compact membrane, has no holes, has interception efficiency of over 99 percent for impurity particles with the diameter of at least 0.1um, and can not enter the electronic equipment through the waterproof sound-transmitting membrane, so that the normal operation of the electronic equipment is further ensured, and the service life of the electronic equipment is prolonged.
The interception efficiency testing method comprises the following steps: with reference to ashrae52.2, after the diaphragm is fixed in the closed cavity, one side of the diaphragm is equipped with dust with particle size of 0.1um and dust movement excitation device, the other side of the diaphragm is equipped with particle sensor, no dust particles are generated under initial condition. After the test is started, the dust movement excitation device excites 100g of 0.1um dust to move, after waiting for 30min, the measured value of 0.1um dust particles in the cavity on the other side is read, and if the total dust content in the cavity on the other side is lower than 1g, the dust prevention efficiency of the membrane to the 0.1um particles is judged to be not lower than 99%.
As a further improvement of the present invention, the polymer film is any one of PI, PE, PET and PP.
The film formed by 4 polymers, namely PI (polyimide), PE (polyethylene), PET (polyethylene terephthalate) and PP (polypropylene), has a very large elastic modulus, can be used as a waterproof sound-transmitting film, has a relatively high surface energy and a general waterproof performance, can also have a relatively low surface energy after being subjected to hydrophobic modification treatment, has a relatively high waterproof performance, and meets the requirements of actual production.
As a further improvement of the invention, the diameter of the waterproof sound-transmitting membrane is 1-5mm, and the thickness is 3-15um; the gram weight of the waterproof sound-transmitting membrane is 3-12g/m 2 。
The diameter and the length of the waterproof sound-transmitting membrane are too large, so that the installation of the waterproof sound-transmitting membrane assembly is not facilitated; the waterproof sound-transmitting membrane has too small diameter length, so that the deformation of the waterproof sound-transmitting membrane is too large when the waterproof sound-transmitting membrane is subjected to 1MPa water pressure, and the normal use of the waterproof sound-transmitting membrane is affected. The gram weight of the waterproof sound-transmitting membrane can influence the elastic modulus of the waterproof sound-transmitting membrane to a certain extent, and the gram weight of the waterproof sound-transmitting membrane is 3-12g/m 2 Therefore, the waterproof sound-transmitting membrane has proper elastic modulus and good sound-transmitting performance. When the thickness of the waterproof sound-transmitting film is too large, the sound-transmitting performance of the waterproof sound-transmitting film is affected, and the sound loss is increased; the mechanical properties of the alloy are affected by too small thickness; the thickness of the waterproof sound-transmitting membrane is 3-15um, so that the waterproof sound-transmitting membrane is guaranteed to have high sound-transmitting performance, and meanwhile, the actual production requirement is met.
As a further improvement of the invention, the annular adhesive layer comprises a first adhesive for adhering to the shell, and the adhesive strength between the first adhesive and the shell is 5-50N/cm; the bonding strength between the first adhesive and the waterproof sound-transmitting membrane is 5-50N/cm.
The first adhesive is a double-sided adhesive, and can be pressure-sensitive adhesive, thermosensitive adhesive, photosensitive adhesive or other double-sided adhesive; if the bonding strength between the first adhesive and the waterproof sound-transmitting membrane is not high enough between the first adhesive and the shell, when the water inlet pressure of 1MPa is received, the first adhesive and the waterproof sound-transmitting membrane are separated, namely the waterproof sound-transmitting membrane component is separated from the shell, the waterproof sound-transmitting membrane component can not play a role in waterproof sound transmission any more, and external liquid can be directly contacted with the acoustic component, so that the acoustic component is damaged to a certain extent, and the electronic equipment can not work normally. According to the waterproof sound-transmitting membrane assembly, the bonding strength between the first adhesive and the shell is high, so that the waterproof sound-transmitting membrane assembly can be tightly attached to the shell, and a good waterproof sound-transmitting effect is achieved.
The method for testing the bonding strength between the adhesive and the soft adherend comprises the following steps: with appropriate adjustments made with reference to ASTM D-3330, method C. The adhesive was punched into strips of 24mm width and 300mm length, and one side of the adhesive was adhered to a stainless steel plate. Then punching the soft adherend into a strip with the width of 24mm and the length of 325mm, aligning the soft adherend strip with one end of the adhesive strip, laminating and pasting, rolling the glued part by a press roll, putting one end of the stainless steel plate into a movable clamping opening of a tension machine, putting the adherend end of the non-glued part into another clamping opening, operating a clamp to stretch at a speed of 5.0+/-0.2 mm/s towards two directions of 180 degrees, and carrying out statistical average on a tensile force value with the displacement distance of 25mm-75mm interval, thus obtaining the bonding strength value.
The method for testing the bonding strength between the adhesive and the hard adherend comprises the following steps: with appropriate adjustments made with reference to ASTM D-3330, method C. The adhesive was die cut into strips of 24mm width and 325mm length. A plane having a width of 24mm and a length of 300mm was cut out on the hard adherend. The adhesive is aligned with one end of a hard object to be adhered, the length of the adhesive strip is 25mm, the adhesive part is rolled by a press roll, one end of the hard object to be adhered is placed into a movable clamping opening of a tension machine, the non-adhesive part of the adhesive is placed into another clamping opening, the clamp is operated to stretch towards two directions of 180 degrees at a speed of 5.0+/-0.2 mm/s, and the tension value with a displacement distance of 25mm-75mm is calculated as an adhesive strength value by statistical average.
As a further improvement of the invention, the annular adhesive layer further comprises a second adhesive for bonding with the acoustic component, the second adhesive is positioned on the side of the waterproof sound-transmitting membrane, which is away from the first adhesive, and the bonding strength between the second adhesive and the acoustic component is 5-50N/cm; the bonding strength between the second adhesive and the waterproof sound-transmitting membrane is 5-50N/cm.
Preferably, the bonding strength between the second adhesive and the acoustic member is 10 to 40N/cm; the bonding strength between the second adhesive and the waterproof sound-transmitting membrane is 10-40N/cm.
The second adhesive is a double-sided adhesive, and can be pressure-sensitive adhesive, thermosensitive adhesive, photosensitive adhesive or other double-sided adhesive;
when the strength of the second adhesive is too low, the fixing force of the edge of the diaphragm is relatively low, and the diaphragm is deformed together with the first adhesive under the action of water pressure. The second adhesive of sufficient strength ensures that the edges of the membrane are held in place without slipping.
As a further improvement of the invention, the difference between the inner diameter and the outer diameter of the first adhesive is 1-6mm, and the thickness is 10-300um; the difference between the inner diameter and the outer diameter of the second adhesive is 1-6mm, and the thickness of the second adhesive is 10-300um.
Preferably, the difference between the inner diameter and the outer diameter of the first adhesive is 2-5mm, and the thickness of the first adhesive is 50-200um; the difference between the inner diameter and the outer diameter of the second adhesive is 2-5mm, and the thickness is 50-200um
In order to make the first adhesive and the second adhesive have stronger bonding strength, the first adhesive and the second adhesive are required to have proper widths and thicknesses, and the difference between the inner diameter and the outer diameter (i.e. the width) of the first adhesive is 1-6mm and the thickness is 10-300um; the difference between the inner diameter and the outer diameter (i.e. the width) of the second adhesive is 1-6mm, and the thickness is 10-300um; thereby ensuring that the first adhesive and the second adhesive have larger bonding strength and good viscosity.
The invention has the beneficial effects that: the waterproof sound-transmitting membrane component comprises a single-layer waterproof sound-transmitting membrane and an annular adhesive layer positioned at the edge of the waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is prepared from a polymer film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 2000-8000MPa; the sound blocking amount is 1.5-6dB in the audio frequency range of 100-10000 Hz; the surface energy of the waterproof sound-transmitting membrane is less than 50mN/m; the waterproof sound-transmitting membrane component has high sound-transmitting property and high waterproof property, the water pressure resistance of the waterproof sound-transmitting membrane component is more than 1MPa, and the waterproof sound-transmitting membrane component can be normally used under 100 meters of water, and is particularly suitable for electronic equipment which needs to be used under 100 meters of water; in addition, the waterproof sound-transmitting membrane component also has higher dustproof effect, and is beneficial to prolonging the service life of electronic equipment.
Drawings
FIG. 1 is a cross-sectional view of a waterproof acoustically transparent membrane assembly according to example 1 of the present invention;
fig. 2 is a schematic structural diagram of a waterproof sound-transmitting membrane module according to embodiment 1 of the present invention;
FIG. 3 is a Scanning Electron Microscope (SEM) image of a waterproof sound-transmitting membrane before hydrophobic modification of example 1, wherein the magnification is 50K;
FIG. 4 is a Scanning Electron Microscope (SEM) image of a hydrophobically modified water-resistant acoustically transparent film of example 1 of the present invention, at a magnification of 50K;
reference numerals: 1. a waterproof sound-transmitting membrane; 2. an annular adhesive layer; 21. a first adhesive; 22. a second adhesive;
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples.
Example 1
The waterproof sound-transmitting membrane component comprises a single-layer waterproof sound-transmitting membrane and an annular adhesive layer positioned at the edge of the waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is prepared from a PI film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 5000MPa; the surface energy of the waterproof sound-transmitting membrane is 30mN/m; the diameter of the waterproof sound-transmitting membrane is 3mm, and the thickness is 9um; the gram weight of the waterproof sound-transmitting membrane is 8g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The annular adhesive layer comprises a first adhesive used for being adhered to the shell, and the adhesive strength between the first adhesive and the shell is 30N/cm; the bonding strength between the first adhesive and the waterproof sound-transmitting membrane is 30N/cm; the annular adhesive layer also comprises a second adhesive used for being adhered to the acoustic component, the second adhesive is positioned on one side of the waterproof sound-transmitting membrane, which is away from the first adhesive, and the bonding strength between the second adhesive and the acoustic component is 30N/cm; the bonding strength between the second adhesive and the waterproof sound-transmitting membrane is 30N/cm; the difference between the inner diameter and the outer diameter of the first adhesive is 3mm, and the thickness of the first adhesive is 150um; the difference (width) between the inner diameter and the outer diameter of the second adhesive is 3mm, and the thickness is 150um.
Example 2
The waterproof sound-transmitting membrane component comprises a single-layer waterproof sound-transmitting membrane and an annular adhesive layer positioned at the edge of the waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is prepared from a PE film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 7000MPa; the surface energy of the waterproof sound-transmitting membrane is 40mN/m; the diameter of the waterproof sound-transmitting membrane is 4mm, and the thickness is 6um; the gram weight of the waterproof sound-transmitting membrane is 12g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The annular adhesive layer comprises a first adhesive used for being adhered to the shell, and the adhesive strength between the first adhesive and the shell is 25N/cm; the bonding strength between the first adhesive and the waterproof sound-transmitting membrane is 25N/cm; the annular adhesive layer also comprises a second adhesive used for being adhered to the acoustic component, the second adhesive is positioned on one side of the waterproof sound-transmitting membrane, which is away from the first adhesive, and the bonding strength between the second adhesive and the acoustic component is 25N/cm; the bonding strength between the second adhesive and the waterproof sound-transmitting membrane is 25N/cm; the difference between the inner diameter and the outer diameter of the first adhesive is 3mm, and the thickness of the first adhesive is 120um; the difference (width) between the inner diameter and the outer diameter of the second adhesive is 3mm, and the thickness is 120um.
Example 3
The waterproof sound-transmitting membrane component comprises a single-layer waterproof sound-transmitting membrane and an annular adhesive layer positioned at the edge of the waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is prepared from a PET film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 4000MPa; the surface energy of the waterproof sound-transmitting membrane is 35mN/m; the diameter of the waterproof sound-transmitting membrane is 3mm, and the thickness is 11um; the gram weight of the waterproof sound-transmitting membrane is 6g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The annular adhesive layer comprises a first adhesive used for being adhered to the shell, and the adhesive strength between the first adhesive and the shell is 30N/cm; the bonding strength between the first adhesive and the waterproof sound-transmitting membrane is 30N/cm; the annular adhesive layer also comprises a second adhesive used for being adhered to the acoustic component, the second adhesive is positioned on one side of the waterproof sound-transmitting membrane, which is away from the first adhesive, and the bonding strength between the second adhesive and the acoustic component is 25N/cm; the second bondThe bonding strength between the agent and the waterproof sound-transmitting membrane is 25N/cm; the difference between the inner diameter and the outer diameter of the first adhesive is 3mm, and the thickness of the first adhesive is 150um; the difference (width) between the inner diameter and the outer diameter of the second adhesive is 3mm, and the thickness is 120um.
Example 4
The waterproof sound-transmitting membrane component comprises a single-layer waterproof sound-transmitting membrane and an annular adhesive layer positioned at the edge of the waterproof sound-transmitting membrane, wherein the waterproof sound-transmitting membrane is prepared from a PP film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 3000MPa; the surface energy of the waterproof sound-transmitting membrane is 30mN/m; the diameter of the waterproof sound-transmitting membrane is 3mm, and the thickness is 14um; the gram weight of the waterproof sound-transmitting membrane is 4g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The annular adhesive layer comprises a first adhesive used for being adhered to the shell, and the adhesive strength between the first adhesive and the shell is 35N/cm; the bonding strength between the first adhesive and the waterproof sound-transmitting membrane is 35N/cm; the annular adhesive layer also comprises a second adhesive used for being adhered to the acoustic component, the second adhesive is positioned on one side of the waterproof sound-transmitting membrane, which is away from the first adhesive, and the bonding strength between the second adhesive and the acoustic component is 20N/cm; the bonding strength between the second adhesive and the waterproof sound-transmitting membrane is 20N/cm; the difference between the inner diameter and the outer diameter of the first adhesive is 5mm, and the thickness of the first adhesive is 150um; the difference (width) between the inner diameter and the outer diameter of the second adhesive is 3mm, and the thickness is 100um.
Performance test of the waterproof acoustically transparent Membrane Assembly prepared in examples 1 to 4
Water pressure resistance test
The assembly was attached to a tool surface having a water outlet hole of 1mm in diameter by appropriately adjusting the water repellency test method B (high water pressure method) defined in JISL1092, and the annular adhesive portion of the assembly was press-fitted with a jig. The water pressure was increased to 1MPa at a rate of 20kPa/s, and then it was observed whether the front and side surfaces of the module were leaking water. If no water leakage exists, the assembly can pass the water pressure resistance test of 1MPa for 30 min.
Through a water pressure resistance test, the water pressure resistance of the waterproof sound-transmitting membrane assemblies prepared in the embodiments 1-4 is above 1MPa, so that the waterproof sound-transmitting membrane assemblies prepared in the embodiments 1-4 can play a role in waterproof sound transmission under 100 meters of water, and then the electronic equipment can be normally used under 100 meters of water.
Water circulation test
Based on the water pressure resistance test, after the first round of water pressure resistance test is carried out, the water pressure is reduced to zero at the speed of 20kPa/s until the pressure difference at the two ends of the diaphragm is zero, the water pressure is increased at the speed of 20kPa/s again, the water pressure resistance test process is repeated, and the judgment standard is consistent with the water pressure resistance test.
Through tests, the waterproof sound-transmitting membrane assemblies prepared in the examples 1-4 can withstand a 1MPa waterproof test for at least 10 cycles, so that the waterproof sound-transmitting membrane assemblies prepared in the examples 1-4 have longer service life and lower cost.
Interception efficiency test was adjusted with reference to ashrae52.2, after the diaphragm was fixed in the closed cavity, a dust and dust movement excitation device with a particle size of 0.1um was fitted in one side cavity of the diaphragm, and a particle sensor was fitted on the other side of the diaphragm, without dust particles under initial conditions. After the test is started, the dust movement excitation device excites 100g of 0.1um dust to move, after waiting for 30min, the measured value of 0.1um dust particles in the cavity on the other side is read, and if the total dust content in the cavity on the other side is lower than 1g, the dust prevention efficiency of the membrane to the 0.1um particles is judged to be not lower than 99%.
Through tests, the waterproof sound-transmitting membrane assemblies prepared in the embodiments 1-4 can achieve the interception efficiency of more than 99% for impurity particles with the diameter of at least 0.1um, and have good dustproof effect, so that the service life of electronic equipment is prolonged, and the economic benefit is high.
Sound blocking amount test
And punching the material to be tested into a wafer with the diameter of 5.0mm, concentric stacking the punched material to be tested and an annular double faced adhesive tape with the outer diameter of 5.0mm and the inner diameter of 1.7mm, wherein the thickness of the double faced adhesive tape is 0.15mm, and finally, attaching the double faced adhesive tape to a microphone test board with a sound outlet with the depth of 1mm and the diameter of 0.8mm, thereby simulating the Louis SPA1687LR5H for microphone winnowing. And a manual mouth is arranged at a position 2cm away from the microphone tool. The analog microphone and the manual mouth are connected with an audio analyzer of model Audio Precision x and 525. The Audio test software of the Audio presentation is utilized to make the artificial mouth emit sound with the sound pressure level of 94dBSPL at the frequency of 100Hz-10000 Hz. Collecting response signals of a microphone end under the conditions that a test component is attached to the surface of a microphone tool and the test component is not attached to the surface of the microphone tool, and making difference to finally obtain sound blocking quantity of a corresponding diaphragm under a certain hertz; the sound blocking amount is in dB.
| Sample preparation | 100Hz | 1000Hz | 5000Hz | 10000Hz |
| Example 1 | 2.1 | 2.2 | 2.7 | 3.5 |
| Example 2 | 1.5 | 1.6 | 2.2 | 3.0 |
| Example 3 | 2.2 | 2.3 | 2.9 | 3.8 |
| Example 4 | 2.4 | 2.5 | 3.2 | 4.3 |
From the above table, it can be seen that the waterproof sound-transmitting membrane assemblies prepared in examples 1 to 4 have a small sound blocking amount in the audio frequency range of 100 to 10000Hz, i.e., the waterproof sound-transmitting membrane assemblies prepared in examples 1 to 4 have high sound-transmitting performance.
After the cyclic waterproof test under the water pressure of 1MPa, the waterproof sound-transmitting membrane assemblies prepared in examples 1-4 are subjected to sound blocking amount test to obtain the sound blocking amount and harmonic distortion increment of the corresponding membrane under a certain hertz.
| Sample preparation | 100Hz | 1000Hz | 5000Hz | 10000Hz |
| Example 1 | 2.1 | 2.2 | 2.8 | 3.6 |
| Example 2 | 1.5 | 1.6 | 2.3 | 3.1 |
| Example 3 | 2.2 | 2.3 | 3.0 | 3.9 |
| Example 4 | 2.4 | 2.5 | 3.3 | 4.5 |
From the above table, it can be seen that the waterproof sound-transmitting membrane assemblies prepared in examples 1 to 4 have little change in sound blocking amount in the audio frequency range of 100 to 10000Hz after the cyclic waterproof test under the water pressure of 1MPa, and the sound blocking amount is still very small, which indicates that the waterproof sound-transmitting membrane assemblies prepared in examples 1 to 4 have high sound-transmitting property and high waterproof property. And the harmonic distortion increment of the waterproof sound-transmitting films of the examples 1-4 under the water pressure of 1MPa is not more than 20%, which further indicates that the waterproof sound-transmitting film assemblies prepared in the examples 1-4 have high waterproof performance.
FIG. 3 is a Scanning Electron Microscope (SEM) image of a waterproof sound-transmitting membrane before hydrophobic modification of example 1, wherein the magnification is 50K; FIG. 4 is a Scanning Electron Microscope (SEM) image of a hydrophobically modified water-resistant acoustically transparent film of example 1 of the present invention, at a magnification of 50K; as can be seen from fig. 3 and 4, the waterproof sound-transmitting membrane of example 1 has no holes on its surface, and is a dense membrane.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (8)
1. The utility model provides a waterproof sound-transmitting membrane subassembly, includes waterproof sound-transmitting membrane of individual layer and is located the annular glue film at waterproof sound-transmitting membrane border, its characterized in that: the waterproof sound-transmitting membrane is prepared from a polymer film subjected to hydrophobic modification treatment; the waterproof sound-transmitting membrane is a compact membrane; the elastic modulus of the waterproof sound-transmitting membrane is 2000-8000MPa;
the sound blocking amount of the waterproof sound-transmitting membrane is 1.5-6dB in the audio frequency range of 100-10000 Hz;
the surface energy of the waterproof sound-transmitting membrane is less than 50mN/m;
after the waterproof sound-transmitting film is subjected to a cyclic waterproof test under the water pressure of 1MPa, the sound blocking amount of the waterproof sound-transmitting film is 1.5-6dB in the audio frequency range of 100-10000 Hz;
the harmonic distortion increment of the waterproof sound-transmitting membrane under the water pressure of 1MPa is at most 20%;
under the action of 1MPa water pressure, the relative deformation of the waterproof sound-transmitting membrane is not more than the elastic limit relative deformation S of the waterproof sound-transmitting membrane, and the elastic limit relative deformation S of the waterproof sound-transmitting membrane is not more than 1%;
the annular adhesive layer comprises a first adhesive used for being adhered to the shell, and the adhesive strength between the first adhesive and the shell is 5-50N/cm; the bonding strength between the first adhesive and the waterproof sound-transmitting membrane is 5-50N/cm.
2. A waterproof sound-transmitting membrane assembly according to claim 1, wherein: the water pressure resistance of the waterproof sound-transmitting membrane module measured by the method B (high water pressure method) of the water resistance test method specified in JISL1092 is 1MPa or more.
3. A waterproof sound-transmitting membrane assembly according to claim 1, wherein: the waterproof sound-permeable membrane is resistant to a 1MPa waterproof test of at least 10 cycles.
4. A waterproof sound-transmitting membrane assembly according to claim 1, wherein: the waterproof sound-transmitting membrane has an interception efficiency of at least 99% for impurity particles with a diameter of at least 0.1 um.
5. A waterproof sound-transmitting membrane assembly according to claim 1, wherein: the polymer film is any one of PI, PE, PET and PP.
6. A waterproof sound-transmitting membrane assembly according to claim 1, wherein: the diameter of the waterproof sound-transmitting membrane is 1-5mm, and the thickness is 3-15um; the gram weight of the waterproof sound-transmitting membrane is 3-12g/m 2 。
7. A waterproof sound-transmitting membrane assembly according to claim 1, wherein: the annular adhesive layer also comprises a second adhesive used for being adhered to the acoustic component, the second adhesive is positioned on one side of the waterproof sound-transmitting membrane, which is away from the first adhesive, and the bonding strength between the second adhesive and the acoustic component is 5-50N/cm; the bonding strength between the second adhesive and the waterproof sound-transmitting membrane is 5-50N/cm.
8. A waterproof acoustically transparent membrane assembly as claimed in claim 7, wherein: the difference between the inner diameter and the outer diameter of the first adhesive is 1-6mm, and the thickness of the first adhesive is 10-300um; the difference between the inner diameter and the outer diameter of the second adhesive is 1-6mm, and the thickness of the second adhesive is 10-300um.
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