A waterproof sound-transmitting membrane assembly

Abstract

The application relates to a waterproof sound-permeable film assembly, which comprises a first adhesive member, a second adhesive member and a sound-permeable film, the sound-permeable film is bonded between the first adhesive member and the second adhesive member, the edge area of the first adhesive member is bonded with the edge area of the second adhesive member, the area where the first adhesive member and the second adhesive member are directly bonded is a rubber-coated area, and the side of the sound-permeable film is isolated from the outside through the rubber-coated area; the width of the rubber-coated area is not less than 10 times the thickness of the sound-permeable film, and the width of the rubber-coated area is not more than 25% of the width of the first adhesive member. The technical scheme of the application sets the rubber-coated area, so that the sound-permeable film is not easy to delaminate, and the bonding strength of the overall structure is improved; secondly, the rubber-coated width is set to be not less than 10 times the thickness of the sound-permeable film and not more than 25% of the width of the first adhesive member, so that the waterproof sound-permeable film assembly not only guarantees air tightness, but also has good waterproofness.

Description

Technical Field

[0001] This invention relates to the field of waterproof and sound-permeable membrane technology, and in particular to a waterproof and sound-permeable membrane assembly. Background Technology

[0002] Electronic devices such as mobile phones, laptops, electronic notebooks, digital cameras, and gaming devices typically have sound capabilities. Inside the casing of these devices are sound-emitting components such as speakers and buzzers, or sound-receiving components such as microphones. Openings are provided on the casing corresponding to the sound emitting or receiving components. Sound is transmitted through these openings. To prevent foreign objects such as water droplets from entering the casing, a sound-permeable membrane is provided to cover the openings. This membrane allows sound to pass through while blocking foreign objects.

[0003] In related technologies, a waterproof and sound-permeable membrane assembly is formed by sequentially connecting a first adhesive (an adhesive such as pressure-sensitive adhesive, the first adhesive referring to the adhesive on the side closest to the external environment), a sound-permeable membrane, and a second adhesive (an adhesive such as pressure-sensitive adhesive, which can be the same type of adhesive as the first adhesive or a different type of adhesive; the second adhesive referring to the adhesive on the side away from the external environment). All three adhesives have the same outer diameter length, thus ensuring the aesthetic appeal of the waterproof and sound-permeable membrane assembly. However, to ensure excellent sound transmission performance, the sound-permeable membrane has a high porosity, allowing for low acoustic resistance when sound passes through it. This, however, can easily lead to insufficient cohesion within the sound-permeable membrane, less than the bonding strength between the membrane and the adhesive, making the membrane prone to delamination during the transfer process. Furthermore, the sound-permeable membrane is a porous material with in-plane permeability, allowing water vapor to potentially flow into the casing, resulting in poor airtightness and condensation in precision circuits, which may cause malfunctions in electronic equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a waterproof and sound-permeable membrane assembly that can effectively avoid the phenomenon of sound-permeable membrane delamination and has good airtightness and waterproofness.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a waterproof and sound-permeable membrane assembly, comprising a first adhesive member, a second adhesive member, and a sound-permeable membrane, wherein the sound-permeable membrane is bonded between the first adhesive member and the second adhesive member, the edge region of the first adhesive member is bonded to the edge region of the second adhesive member, the area where the first adhesive member and the second adhesive member are directly bonded is a coating area, and the side of the sound-permeable membrane is isolated from the outside through the coating area;

[0006] The width of the encapsulated area is not less than 10 times the thickness of the acoustic membrane, and the width of the encapsulated area is not more than 25% of the width of the first adhesive component.

[0007] The above technical solution provides a waterproof and sound-permeable membrane assembly, wherein the first adhesive is the adhesive on the side of the membrane assembly closest to the external environment, and is an adhesive, most commonly pressure-sensitive adhesive, but other adhesives are also possible; the sound-permeable membrane; and the second adhesive (an adhesive, such as pressure-sensitive adhesive, which can be the same as or a different type of adhesive as the first adhesive; the second adhesive is the adhesive on the side of the membrane assembly away from the external environment; and the encapsulation area is the area where the first adhesive and the second adhesive are directly bonded, preferably in an annular shape; by setting the encapsulation area, the sound-permeable membrane outside the edge area is bonded by the first adhesive and the second adhesive, so that the sound-permeable membrane is less likely to delaminate during the transfer process of the sound-permeable membrane assembly (even if the cohesion inside the sound-permeable membrane is low and it is easy to delaminate, i.e., the peel strength of the sound-permeable membrane itself is too low), thereby making the entire waterproof and sound-permeable membrane assembly less prone to delamination and improving the overall structural bonding strength.

[0008] Meanwhile, by setting up an encapsulation area, the sides of the acoustic membrane are not in direct contact with the outside, thus preventing external water vapor from entering the acoustic equipment. This ensures excellent airtightness and extends the lifespan of the acoustic equipment. So, is a larger encapsulation area always better? (The width of the encapsulation area, also known as the encapsulation width, is calculated as (outer diameter of the first adhesive component - diaphragm diameter) / 2) Clearly not. In fact, a smaller encapsulation width is preferable. This is because with technological advancements, there is a growing desire for miniaturization and precision. Therefore, the thickness and overall area of ​​the entire component should not be excessively large (this area can be considered as viewed from above). The figure shows the maximum area of ​​the entire component. Generally, the size of the overall area is considered to be determined by the outer diameter of the first adhesive component and / or the second adhesive component. When the area of ​​the entire component remains basically unchanged, the outer diameter of the first adhesive component also changes little. At this time, as the width of the adhesive coating increases, the bonding area between the first and second adhesive components and the diaphragm will decrease. As the bonding area between the two adhesive components and the sound-permeable membrane decreases, the sound-permeable membrane is easily separated from the first adhesive component, which makes the waterproof performance of the waterproof sound-permeable membrane component worse and also makes the sound-permeable area smaller, thus making the sound transmission effect worse. Therefore, the present invention controls the width of the adhesive coating area to be no more than 25% of the width of the first adhesive component.

[0009] So, is a smaller overlay area always better? Obviously not. When the overlay area is too small, we find that the sound-permeable membrane is still prone to delamination, making it difficult to guarantee the airtightness of the waterproof sound-permeable membrane assembly. This is because under pressure, the first and second adhesive components will temporarily stick together to form an overlay area. However, since both the first and second adhesive components have a certain degree of rigidity, it is difficult for the overlay area to be truly overlaid. Gaps will appear on the sides of the overlay area, making it easy for the sound-permeable membrane to delaminate, which will make it difficult to guarantee the airtightness of the waterproof sound-permeable membrane assembly. Therefore, an overlay area of ​​a certain width is required.

[0010] Furthermore, we discovered that in related technologies (without an encapsulation area), the entire module sometimes experiences Helmholtz resonance, meaning the audio quality deteriorates in a specific frequency range, resulting in increased acoustic impedance. This is particularly noticeable in the high-frequency range of 10,000-20,000 kHz, where the acoustic impedance of the acoustic membrane module can increase significantly, becoming excessive and failing to meet practical application requirements. However, this phenomenon does not disappear or its probability is significantly reduced by the presence of an encapsulation area. For example, when the encapsulation width is 4-8 times the membrane thickness, although the overall airtightness of the module is improved, the probability of Helmholtz resonance remains relatively high. However, by chance, when we set the encapsulation width slightly larger, we were pleasantly surprised to find that the probability of Helmholtz resonance in the entire module was greatly reduced. Further research revealed that when the width of the encapsulation area is not less than 10 times the thickness of the acoustic membrane, the probability of Helmholtz resonance in the entire module is significantly reduced, meaning the entire module exhibits low acoustic impedance in the 100-20,000 kHz frequency range, meeting the requirements of practical applications.

[0011] Preferably, the thickness of the sound-permeable membrane is 8-30 μm, and the width of the first adhesive is 0.5-3 mm.

[0012] The thickness of the acoustic membrane is set to 10-30μm, more preferably, the thickness of the acoustic membrane is 10μm; based on the thickness of the acoustic membrane and the width of the first adhesive, the width of the adhesive-coated area can be obtained as 0.15-0.35mm.

[0013] When the thickness of the acoustic membrane is greater than 30μm, the resulting overlay is too wide. Due to the rigidity of the adhesive, a large rebound force will be generated, which will separate the first adhesive and the second adhesive. This will make it difficult to ensure the airtightness of the waterproof acoustic membrane assembly and increase the occurrence of Helmholtz resonance. When the thickness of the acoustic membrane is less than 8μm, it increases the difficulty of the processing technology, and the acoustic membrane is too soft, resulting in poor waterproof performance.

[0014] When the width of the first adhesive component is greater than 3mm, the waterproof and sound-permeable membrane assembly is generally installed in a groove, which makes installation difficult and also makes the sound-permeable area in the middle too small, resulting in poor sound transmission performance. When the width of the first adhesive component is less than 0.5mm, the area where the first and second adhesive components are bonded to the sound-permeable membrane is reduced, which reduces the waterproof performance.

[0015] Preferably, the inner diameter of the first adhesive component is 1.5-2.5 mm, and the inner diameter of the first adhesive component is 30-50% of the outer diameter;

[0016] The diameter of the sound-permeable membrane is 1.5-3 times the inner diameter of the first adhesive component.

[0017] The inner diameter of the first adhesive component is set to 1.5-2.5mm. The size of the inner diameter of the first adhesive component is the size of the sound-permeable area. The inner diameter of the first adhesive component cannot be too large or too small, ensuring the size of the sound-permeable area, so that the waterproof sound-permeable membrane assembly has good sound transmission performance. The inner diameter of the first adhesive component is set to 30-50% of the outer diameter, and the diameter of the sound-permeable membrane is set to 1.5-3 times the inner diameter of the first adhesive component. This ensures the effectiveness of the width of the adhesive area, making the sound-permeable membrane less prone to delamination. This gives the waterproof sound-permeable membrane assembly good airtightness, while also ensuring the bonding area between the two adhesive components and the sound-permeable membrane, so that the waterproof sound-permeable membrane assembly has good waterproof performance.

[0018] Based on the inner diameter of the first adhesive component, the outer diameter of the first adhesive component can be obtained as 3.5-5mm; preferably, the inner diameter of the first adhesive component is 1.5-2.0mm; more preferably, the inner diameter of the first adhesive component is 1.6mm and the outer diameter of the first adhesive component is 4.2mm. Based on the inner diameter of the first adhesive component, the diameter of the sound-permeable membrane can be 3.6mm.

[0019] Preferably, both the first adhesive and the second adhesive are double-sided adhesives, each comprising an adhesive layer and a substrate layer disposed along its thickness direction; the adhesive layer is located on both sides of the substrate layer;

[0020] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, part of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area.

[0021] The dynamic shear strength of the adhesive layer is 700-1200 kPa, and the displacement of the adhesive in the adhesive layer is 0.3-2 mm.

[0022] Due to the rebound of the substrate layer, the two adhesive components tend to separate, which in turn makes it possible for the sound-permeable membrane to delaminate with the two adhesive components. In the adhesive area where the first and second adhesive components are bonded to the sound-permeable membrane, the adhesive in the adhesive layer will seep into the membrane pores of the sound-permeable membrane to form a permeation zone. The amount of adhesive seeping into the membrane pores should not be too much or too little. The fluidity of the adhesive is limited by the dynamic shear strength of the adhesive layer and the amount of displacement of the adhesive in the adhesive layer.

[0023] Dynamic shear strength is the lateral anti-slip capability. A high dynamic shear strength in the adhesive layer means the acoustic membrane, fixed by the adhesive, is less prone to wrinkling, thus providing better audio performance. When the dynamic shear strength of the adhesive layer is less than 700 kPa and the displacement of the adhesive within the layer is greater than 2 mm, excessive adhesive seeps into the acoustic membrane, reducing its permeability. Simultaneously, excessive adhesive penetration increases the membrane's weight (gram weight). In high-frequency bands, the membrane primarily relies on vibration for sound transmission; an excessively heavy membrane increases the probability of Helmholtz resonance, leading to audio degradation and increased acoustic impedance in specific frequency ranges. Particularly in the 10,000-20,000 kHz high-frequency range, the acoustic impedance of the acoustic membrane assembly can sometimes increase significantly, becoming too high to meet practical application requirements.

[0024] When the dynamic shear strength of the adhesive layer is greater than 1200 kPa and the displacement of the adhesive within the layer is less than 0.3 mm, insufficient adhesive penetration into the sound-permeable membrane occurs. Furthermore, when the two adhesive components are peeled off, delamination can occur within the membrane. Therefore, setting the dynamic shear strength of the adhesive layer to 700-1200 kPa and the displacement of the adhesive within the layer to 0.3-2 mm ensures that an appropriate amount of adhesive penetrates into the pores of the sound-permeable membrane. This not only guarantees the membrane's permeability but also effectively prevents delamination. Surprisingly, we found that an appropriate amount of adhesive penetration into the membrane does not significantly increase the probability of Helmholtz resonance, meaning the membrane maintains good sound transmission performance across various frequency bands.

[0025] Preferably, the thickness of the adhesive layer is 20-60 μm, and the ratio of the thickness of the substrate layer to the thickness of the adhesive layer is 0.4-0.7; and / or

[0026] The average thickness of the permeation zone is 4-15 μm, and the average thickness of the permeation zone is not less than 50% of the membrane thickness; and / or

[0027] The average width of the penetration zone is 0.4-3 mm, and the average width of the penetration zone is 75%-100% of the width of the first adhesive.

[0028] Setting the adhesive layer thickness to 20-60µm and the ratio of the substrate layer thickness to the adhesive layer thickness to 0.4-0.7 effectively ensures the adhesive bonding area and thus the bonding strength. When the adhesive layer thickness is greater than 60µm and the ratio of the substrate layer thickness to the adhesive layer thickness is less than 0.4, the adhesive in the adhesive layer can more easily penetrate into the sound-permeable membrane, reducing the permeability of the sound-permeable membrane. Furthermore, an excessively thick adhesive layer can compromise the rigidity of the substrate layer, making the overall structure of the two adhesive components too soft and causing difficulties in installation. When the adhesive layer thickness is less than 20µm and the ratio of the substrate layer thickness to the adhesive layer thickness is greater than 0.7, the adhesive layer is too thin, and the substrate layer is too rigid. After the two adhesive components are bonded, they will deform. The deformed substrate layer has a tendency to spring back, which makes the two adhesive components prone to separation. This can lead to delamination between the sound-permeable membrane and the two adhesive components. Additionally, when the two adhesive components peel off the sound-permeable membrane, delamination can occur inside the sound-permeable membrane, significantly reducing the overall bonding strength.

[0029] The average thickness of the permeation zone is 4-15 μm, and the average width is 0.4-3 mm. This allows an appropriate amount of adhesive to penetrate into the pores of the sound-permeable membrane, ensuring its permeability and effectively preventing delamination. The average thickness of the permeation zone is not less than 50% of the membrane thickness, and the average width of the permeation zone is 75%-100% of the width of the first adhesive component. This is to further prevent delamination within the sound-permeable membrane when the two adhesive components are peeled off.

[0030] Preferably, the elastic modulus of the substrate layer is 50-300 MPa, the elastic limit deformation of the substrate layer is 0.5%-5%, and the Vickers hardness of the substrate layer is 40-70 HV.

[0031] The adhesive layer has a bonding strength of 5N / 25mm-30N / 25mm.

[0032] The rebound value of the adhesive is determined by the properties of the substrate layer. To ensure that the first and second adhesives have suitable rebound values, the elastic modulus of the substrate layer is set to 50-300 MPa, the elastic limit deformation to be 0.5%-5%, and the Vickers hardness to be 40-70 HV. This prevents excessive rebound and ensures good bonding strength, effectively avoiding delamination in the waterproof and sound-permeable membrane assembly. When the Vickers hardness of the substrate layer is less than 40 HV, the first and second adhesives become too soft, thus reducing the overall mechanical strength of the waterproof and sound-permeable membrane assembly. We also found...

[0033] When the substrate layer has a suitable elastic modulus (i.e., the first adhesive and the second adhesive have suitable rigidity), the entire sound-permeable membrane assembly also has good sound transmission, and at the same time, it is easier to reduce the probability of Helmholtz resonance and has good sound transmission in various frequency bands.

[0034] Preferably, the difference between the surface energy of the outer surface of the sound-permeable membrane and the surface tension of the adhesive layer is 5-15 mN / m;

[0035] The surface roughness of the acoustic membrane is Ra = 0.15 μm - 0.55 μm.

[0036] The difference between the surface energy of the outer surface of the acoustic membrane and the surface tension of the adhesive layer is set to 5-15 mN / m. This not only firmly bonds the adhesive to the acoustic membrane but also prevents the adhesive layer from flowing too much on the acoustic membrane. The surface roughness of the acoustic membrane is Ra = 0.15um-0.55um, resulting in a larger bonding surface area and a stronger bond between the acoustic membrane and the adhesive layer. This also prevents excessive flow of the adhesive layer on the acoustic membrane. When the surface roughness of the acoustic membrane is less than 0.15um, the adhesive layer between the acoustic membrane and the adhesive layer is not tightly bonded, making it prone to delamination or air leakage. When the surface roughness of the acoustic membrane is greater than 0.55um, the flow of the adhesive layer on the acoustic membrane also decreases, making it difficult for the adhesive to penetrate the acoustic membrane.

[0037] Preferably, the surface energy of the outer surface of the sound-permeable membrane is 20-35 mN / m, and the surface tension of the adhesive layer is 10-20 mN / m.

[0038] The surface energy of the outer surface of the sound-permeable membrane should be set to 20-35 mN / m. The surface energy should not be too high or too low. When the surface energy exceeds 35 mN / m, the membrane's waterproof and oil-proof properties will be difficult to guarantee, and the adhesive in the adhesive layer will easily penetrate into the sound-permeable area. When the surface energy is below 20 mN / m, the adhesive in the adhesive layer will have difficulty penetrating into the membrane, and due to the rebound of the substrate layer, the membrane may delaminate. Setting the surface tension of the adhesive layer to 10-20 mN / m allows an appropriate amount of adhesive to penetrate into the membrane, effectively preventing delamination.

[0039] Preferably, the sound-permeable membrane has a pore size of 0.1-10 μm, a porosity of 30-70%, a diameter of 1-5 mm, and a basis weight of 3-12 g / m².

[0040] Setting the pore size of the acoustic membrane to 0.1-10 μm, the porosity to 30-70%, the diameter to 1-5 mm, and the basis weight to 3-12 g / m² is to effectively ensure the permeability of the acoustic membrane, allowing an appropriate amount of adhesive from the adhesive layer to penetrate into the membrane. A suitable membrane material not only ensures good sound transmission performance for the entire acoustic membrane assembly but also helps reduce the probability of Helmholtz resonance. In the high-frequency range of 10,000-20,000 Hz, the acoustic impedance of the acoustic membrane assembly remains low and does not undergo abrupt changes, further meeting the needs of practical applications.

[0041] Preferably, the sound-permeable membrane is any one of nylon membrane, polyethylene membrane, polypropylene membrane, polytetrafluoroethylene membrane, and polyimide membrane;

[0042] The waterproof and sound-permeable membrane assembly has a water pressure resistance greater than 20 kPa;

[0043] The sound blocking capacity of the waterproof and sound-permeable membrane assembly is less than 2dB@100-20000Hz.

[0044] The acoustic permeable membrane is selected from any one of nylon, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), and polyimide membranes. Firstly, its high mechanical strength ensures the overall strength of the waterproof acoustic permeable membrane assembly, meeting the requirements of practical applications. Secondly, it is heat-resistant and chemically stable; for example, PTFE membranes are resistant to acids and alkalis, exhibiting stable performance. The waterproof acoustic permeable membrane assembly has a water pressure resistance greater than 20 kPa, effectively guaranteeing its waterproofness and providing good airtightness.

[0045] Since audio testing of MEMS on the PCB board is required, the sound blocking of the waterproof and sound-permeable membrane assembly is preferably less than 2dB@100-20000Hz, so that the waterproof and sound-permeable membrane assembly has good sound transmission when MEMS is tested for audio.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] The waterproof and acoustically permeable membrane assembly provided in the above technical solution, by setting an encapsulation area, bonds the edge area of ​​the acoustically permeable membrane to the first adhesive and the second adhesive, resulting in low peel strength of the acoustically permeable membrane and making it less prone to delamination. This, in turn, makes the entire waterproof and acoustically permeable membrane assembly less prone to delamination and improves the overall structural bonding strength. Secondly, the structure in related technologies has poor airtightness and Helmholtz resonance, which degrades the audio frequency in a specific frequency band, i.e., increases the acoustic impedance. However, the present invention sets the encapsulation width to be no less than 10 times the thickness of the acoustically permeable membrane and no more than 25% of the width of the first adhesive, which not only ensures the airtightness of the waterproof and acoustically permeable membrane assembly, but also has better waterproof performance. Attached Figure Description

[0048] Figure 1 This is a cross-sectional schematic diagram from one perspective of a waterproof and sound-permeable membrane assembly in an embodiment of the present invention.

[0049] Figure 2 This is a cross-sectional schematic diagram from another perspective of a waterproof and sound-permeable membrane assembly in an embodiment of the present invention;

[0050] Figure 3 for Figure 1 A schematic diagram of the first adhesive component shown;

[0051] Figure 4 for Figure 1 A schematic diagram of the acoustic membrane shown.

[0052] Figure 5 for Figure 3 The diagram shows the internal structure of the first adhesive component.

[0053] Figure 6 This is a schematic diagram of the dynamic shear force testing device for pressure-sensitive adhesive in an embodiment of the present invention;

[0054] Figure 7 This is a cross-sectional schematic diagram of a waterproof and sound-permeable membrane assembly in Comparative Example 2 of the present invention;

[0055] Figure 8 This is a cross-sectional schematic diagram of a waterproof and sound-permeable membrane assembly in Comparative Example 3 of the present invention;

[0056] Figure 9 for Figure 1 An enlarged schematic diagram of point A shown.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1. First adhesive component; 11. Substrate layer; 12. Adhesive layer; 2. Second adhesive component; 3. Sound-permeable membrane; 31. Permeation zone; 4. Glue-coating zone; 51. Aluminum plate; 52. Adhesive. Detailed Implementation

[0059] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] Please see Figures 1-9 This invention provides a waterproof and sound-permeable membrane assembly, wherein the dynamic shear strength of the adhesive layer 12 is 700-1200 kPa, and the displacement of the adhesive in the adhesive layer 12 is 0.3-2 mm. The testing method is as follows: Figure 6 As shown, firstly, prepare two 100mm*20mm aluminum plates 51 as test plate materials, and cut the samples to 20mm*20mm; secondly, apply adhesive 52 between the two aluminum plates 51 as shown in the figure, and then perform bonding treatment, apply 10kg pressure perpendicular to the aluminum plates 51, maintain the pressure for 5 minutes and then release the pressure; next, let it stand for 5 minutes; fourthly, connect the device to the tensile testing machine, and test at a speed of 50mm / min; fifthly, record the maximum force (N) and shear strength (KPa) of adhesive 52 failure, and save the original data of the force-displacement diagram.

[0063] The dynamic shear strength is measured; a higher dynamic shear strength indicates lower fluidity. The tensile testing machine automatically records the data. The displacement of the adhesive in adhesive layer 12 is 0.3-2mm (this is the displacement at which the tensile testing machine applies the applied force, which has a maximum value and a point where the force is released; the tensile testing machine automatically records the displacement at these two points, which is called the maximum force point displacement).

[0064] Example 1

[0065] This embodiment provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive component 1, a second adhesive component 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 25 kPa and a sound blocking capacity of 1.5 dB@100-10000 Hz. The first adhesive component 1 and the second adhesive component 2 can be the same; the structure and performance parameters of the second adhesive component 2 will not be described in detail below.

[0066] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0067] The adhesive layer 12 has a dynamic shear strength of 700 kPa and a displacement of 2 mm. The adhesive layer 12 has a thickness of 20 μm and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.4. The adhesive layer 12 has a bonding strength of 5 N / 25 mm.

[0068] The elastic modulus of the substrate layer 11 is 300 MPa, the elastic limit deformation of the substrate layer 11 is 5%, and the Vickers hardness of the substrate layer 11 is 40 HV.

[0069] The width of the first adhesive component 1 is 3mm, the inner diameter of the first adhesive component 1 is 1.5mm, and the inner diameter of the first adhesive component 1 is 30% of the outer diameter.

[0070] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 4 μm, and the average width of the permeation area 31 is 2.25 mm.

[0071] The sound-permeable membrane 3 is a nylon membrane. The diameter of the sound-permeable membrane 3 is three times the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 8 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.15 μm. The pore size of the sound-permeable membrane 3 is 0.1 μm. The porosity of the sound-permeable membrane 3 is 30%. The diameter of the sound-permeable membrane 3 is 4.5 mm. The basis weight of the sound-permeable membrane 3 is 10 g / m³. 2The surface energy difference between the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 15 mN / m; the surface energy of the outer surface of the sound-permeable membrane 3 is 25 mN / m, and the surface tension of the adhesive layer 12 is 10 mN / m.

[0072] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 20 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 12% of the width of the first adhesive 1.

[0073] Example 2

[0074] This embodiment provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 30 kPa and a sound blocking capacity of 1 dB@100-10000 Hz.

[0075] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0076] The dynamic shear strength of the adhesive layer 12 is 1200 kPa, and the displacement of the adhesive in the adhesive layer 12 is 0.3 mm; the thickness of the adhesive layer 12 is 60 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.7; the bonding strength of the adhesive layer 12 is 30 N / 25 mm.

[0077] The elastic modulus of the substrate layer 11 is 50 MPa, the elastic limit deformation of the substrate layer 11 is 0.5%, and the Vickers hardness of the substrate layer 11 is 70 HV.

[0078] The width of the first adhesive component 1 is 0.5 mm, the inner diameter of the first adhesive component 1 is 2.5 mm, and the inner diameter of the first adhesive component 1 is 50% of the outer diameter.

[0079] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 15 μm, and the average width of the permeation area 31 is 0.5 mm.

[0080] The sound-permeable membrane 3 is a polyethylene membrane. The diameter of the sound-permeable membrane 3 is 1.5 times the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 30 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.55 μm. The pore size of the sound-permeable membrane 3 is 10 μm. The porosity of the sound-permeable membrane 3 is 70%. The diameter of the sound-permeable membrane 3 is 3.75 mm. The basis weight of the sound-permeable membrane 3 is 8 g / m³. 2 The surface energy difference between the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 5 mN / m; the surface energy of the outer surface of the sound-permeable membrane 3 is 25 mN / m, and the surface tension of the adhesive layer 12 is 20 mN / m.

[0081] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 10 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 25% of the width of the first adhesive 1.

[0082] Example 3

[0083] This embodiment provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 33 kPa and a sound blocking capacity of 0.8 dB@100-10000 Hz.

[0084] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0085] The dynamic shear strength of the adhesive layer 12 is 1000 kPa, and the displacement of the adhesive in the adhesive layer 12 is 1.2 mm; the thickness of the adhesive layer 12 is 50 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.6; the bonding strength of the adhesive layer 12 is 25 N / 25 mm.

[0086] The elastic modulus of the substrate layer 11 is 250 MPa, the elastic limit deformation of the substrate layer 11 is 4%, and the Vickers hardness of the substrate layer 11 is 60 HV.

[0087] The width of the first adhesive component 1 is 2.5 mm, the inner diameter of the first adhesive component 1 is 2 mm, and the inner diameter of the first adhesive component 1 is 40% of the outer diameter.

[0088] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 6 μm, and the average width of the permeation area 31 is 2.5 mm.

[0089] The sound-permeable membrane 3 is a polypropylene membrane. The diameter of the sound-permeable membrane 3 is twice the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 10 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.35 μm. The pore size of the sound-permeable membrane 3 is 5 μm. The porosity of the sound-permeable membrane 3 is 50%. The diameter of the sound-permeable membrane 3 is 4 mm. The basis weight of the sound-permeable membrane 3 is 9 g / m2. The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 10 mN / m. The surface energy of the outer surface of the sound-permeable membrane 3 is 20 mN / m. The surface tension of the adhesive layer 12 is 10 mN / m.

[0090] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 15 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 14% of the width of the first adhesive 1.

[0091] Example 4

[0092] This embodiment provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 35 kPa and a sound blocking capacity of 1.2 dB@100-10000 Hz.

[0093] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0094] The dynamic shear strength of the adhesive layer 12 is 800 kPa, and the displacement of the adhesive in the adhesive layer 12 is 1.8 mm; the thickness of the adhesive layer 12 is 40 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.6; the bonding strength of the adhesive layer 12 is 20 N / 25 mm.

[0095] The elastic modulus of the substrate layer 11 is 200 MPa, the elastic limit deformation of the substrate layer 11 is 3.5%, and the Vickers hardness of the substrate layer 11 is 50 HV.

[0096] The width of the first adhesive component 1 is 0.8 mm, the inner diameter of the first adhesive component 1 is 1.8 mm, and the inner diameter of the first adhesive component 1 is 35% of the outer diameter.

[0097] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 15 μm, and the average width of the permeation area 31 is 0.72 mm.

[0098] The sound-permeable membrane 3 is a polytetrafluoroethylene membrane. The diameter of the sound-permeable membrane 3 is twice the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 25 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.4 μm. The pore size of the sound-permeable membrane 3 is 8 μm. The porosity of the sound-permeable membrane 3 is 60%. The diameter of the sound-permeable membrane 3 is 3.6 mm. The basis weight of the sound-permeable membrane 3 is 7.5 g / m2. The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 15 mN / m. The surface energy of the outer surface of the sound-permeable membrane 3 is 35 mN / m. The surface tension of the adhesive layer 12 is 20 mN / m.

[0099] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 10 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 22% of the width of the first adhesive 1.

[0100] Example 5

[0101] This embodiment provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 40 kPa and a sound blocking capacity of 1.8 dB@100-10000 Hz.

[0102] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0103] The dynamic shear strength of the adhesive layer 12 is 900 kPa, and the displacement of the adhesive in the adhesive layer 12 is 1.5 mm; the thickness of the adhesive layer 12 is 35 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.48; the bonding strength of the adhesive layer 12 is 18 N / 25 mm.

[0104] The elastic modulus of the substrate layer 11 is 150 MPa, the elastic limit deformation of the substrate layer 11 is 3%, and the Vickers hardness of the substrate layer 11 is 45 HV.

[0105] The width of the first adhesive component 1 is 2 mm, the inner diameter of the first adhesive component 1 is 2.2 mm, and the inner diameter of the first adhesive component 1 is 45% of the outer diameter.

[0106] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 7.5 μm, and the average width of the permeation area 31 is 1.6 mm.

[0107] The sound-permeable membrane 3 is a polyimide membrane. The diameter of the sound-permeable membrane 3 is 1.5 times the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 15 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.3 μm. The pore size of the sound-permeable membrane 3 is 7 μm. The porosity of the sound-permeable membrane 3 is 55%. The diameter of the sound-permeable membrane 3 is 3.3 mm. The basis weight of the sound-permeable membrane 3 is 7 g / m2. The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 5 mN / m. The surface energy of the outer surface of the sound-permeable membrane 3 is 20 mN / m. The surface tension of the adhesive layer 12 is 15 mN / m.

[0108] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 20 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 16% of the width of the first adhesive 1.

[0109] Example 6

[0110] This embodiment provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 30 kPa and a sound blocking capacity of 1 dB@100-10000 Hz.

[0111] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0112] The dynamic shear strength of the adhesive layer 12 is 1100 kPa, and the displacement of the adhesive in the adhesive layer 12 is 0.8 mm; the thickness of the adhesive layer 12 is 30 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.45; the bonding strength of the adhesive layer 12 is 12 N / 25 mm.

[0113] The elastic modulus of the substrate layer 11 is 245 MPa, the elastic limit deformation of the substrate layer 11 is 4%, and the Vickers hardness of the substrate layer 11 is 60 HV.

[0114] The width of the first adhesive component 1 is 1.5 mm, the inner diameter of the first adhesive component 1 is 2.5 mm, and the inner diameter of the first adhesive component 1 is 48% of the outer diameter.

[0115] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 10 μm, and the average width of the permeation area 31 is 1.5 mm.

[0116] The sound-permeable membrane 3 is a nylon membrane. The diameter of the sound-permeable membrane 3 is 1.8 times the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 20 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.5 μm. The pore size of the sound-permeable membrane 3 is 4 μm. The porosity of the sound-permeable membrane 3 is 40%. The diameter of the sound-permeable membrane 3 is 4.5 mm. The basis weight of the sound-permeable membrane 3 is 12 g / m³. 2 The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 10 mN / m; the surface energy of the outer surface of the sound-permeable membrane 3 is 30 mN / m, and the surface tension of the adhesive layer 12 is 20 mN / m.

[0117] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 10 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 20% of the width of the first adhesive 1.

[0118] Example 7

[0119] This embodiment provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 30 kPa and a sound blocking capacity of 1 dB@100-10000 Hz.

[0120] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0121] The dynamic shear strength of the adhesive layer 12 is 1000 kPa, and the displacement of the adhesive in the adhesive layer 12 is 1.2 mm; the thickness of the adhesive layer 12 is 60 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.7; the bonding strength of the adhesive layer 12 is 30 N / 25 mm.

[0122] The elastic modulus of the substrate layer 11 is 190 MPa, the elastic limit deformation of the substrate layer 11 is 3.8%, and the Vickers hardness of the substrate layer 11 is 50 HV.

[0123] The width of the first adhesive component 1 is 3mm, the inner diameter of the first adhesive component 1 is 1.5mm, and the inner diameter of the first adhesive component 1 is 33% of the outer diameter.

[0124] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 7.2 μm, and the average width of the permeation area 31 is 2.25 mm.

[0125] The sound-permeable membrane 3 is a polyimide membrane. The diameter of the sound-permeable membrane 3 is three times the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 8 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.25 μm. The pore size of the sound-permeable membrane 3 is 5 μm. The porosity of the sound-permeable membrane 3 is 50%. The diameter of the sound-permeable membrane 3 is 4.5 mm. The basis weight of the sound-permeable membrane 3 is 11 g / m2. The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 15 mN / m. The surface energy of the outer surface of the sound-permeable membrane 3 is 25 mN / m. The surface tension of the adhesive layer 12 is 10 mN / m.

[0126] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 10 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 12% of the width of the first adhesive 1.

[0127] Comparative Example 1

[0128] This comparative example provides a waterproof and sound-permeable membrane 3 assembly, including a first adhesive component 1, a second adhesive component 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 25 kPa and a sound blocking capacity of 1.5 dB@100-10000 Hz. The first adhesive component 1 and the second adhesive component 2 can be the same; the structure and performance parameters of the second adhesive component 2 will not be described in detail below.

[0129] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0130] The adhesive layer 12 has a dynamic shear strength of 700 kPa and a displacement of 2 mm. The adhesive layer 12 has a thickness of 20 μm and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.4. The adhesive layer 12 has a bonding strength of 5 N / 25 mm.

[0131] The elastic modulus of the substrate layer 11 is 300 MPa, the elastic limit deformation of the substrate layer 11 is 5%, and the Vickers hardness of the substrate layer 11 is 40 HV.

[0132] The width of the first adhesive component 1 is 3mm, the inner diameter of the first adhesive component 1 is 1.5mm, and the inner diameter of the first adhesive component 1 is 30% of the outer diameter.

[0133] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 7.2 μm, and the average width of the permeation area 31 is 3 mm.

[0134] The sound-permeable membrane 3 is a nylon membrane. The diameter of the sound-permeable membrane 3 is three times the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 8 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.15 μm. The pore size of the sound-permeable membrane 3 is 0.1 μm. The porosity of the sound-permeable membrane 3 is 30%. The diameter of the sound-permeable membrane 3 is 4.5 mm. The basis weight of the sound-permeable membrane 3 is 10 g / m2. The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 15 mN / m. The surface energy of the outer surface of the sound-permeable membrane 3 is 25 mN / m. The surface tension of the adhesive layer 12 is 10 mN / m.

[0135] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 20 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 30% of the width of the first adhesive 1.

[0136] Comparative Example 2

[0137] like Figure 7 As shown in the comparative example, a waterproof and sound-permeable membrane 3 assembly is provided, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 30 kPa and a sound blocking capacity of 1 dB@100-10000 Hz.

[0138] The sound-permeable membrane 3 is bonded between the first adhesive component 1 and the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are annular, and the width of the first adhesive component 1 is equal to the width of the second adhesive component 2. Both the first adhesive component 1 and the second adhesive component 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. The edge area of ​​the first adhesive component 1 is bonded to the second adhesive component 2 through the adhesive layer 12. A portion of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0139] The dynamic shear strength of the adhesive layer 12 is 1200 kPa, and the displacement of the adhesive in the adhesive layer 12 is 0.3 mm; the thickness of the adhesive layer 12 is 60 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.7; the bonding strength of the adhesive layer 12 is 30 N / 25 mm.

[0140] The elastic modulus of the substrate layer 11 is 50 MPa, the elastic limit deformation of the substrate layer 11 is 0.5%, and the Vickers hardness of the substrate layer 11 is 70 HV.

[0141] The width of the first adhesive component 1 is 2.5 mm, the inner diameter of the first adhesive component 1 is 2.5 mm, and the inner diameter of the first adhesive component 1 is 50% of the outer diameter.

[0142] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 15 μm, and the average width of the permeation area 31 is 2.5 mm.

[0143] The sound-permeable membrane 3 is a polyethylene membrane. The diameter of the sound-permeable membrane 3 is 1.5 times the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 30 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.55 μm. The pore size of the sound-permeable membrane 3 is 10 μm. The porosity of the sound-permeable membrane 3 is 70%. The diameter of the sound-permeable membrane 3 is 3.75 mm. The basis weight of the sound-permeable membrane 3 is 8 g / m2. The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 5 mN / m. The surface energy of the outer surface of the sound-permeable membrane 3 is 25 mN / m. The surface tension of the adhesive layer 12 is 20 mN / m.

[0144] The edge region of the first adhesive 1 is bonded to the edge region of the second adhesive 2. The area where the first adhesive 1 and the second adhesive 2 are bonded is the encapsulation area 4. The encapsulation area 4 is annular. The width of the encapsulation area 4 is 3 times the thickness of the sound-permeable membrane 3, and the width of the encapsulation area 4 is 14% of the width of the first adhesive 1.

[0145] Comparative Example 3

[0146] like Figure 8 As shown in the comparative example, a waterproof and sound-permeable membrane 3 assembly is provided, including a first adhesive 1, a second adhesive 2, and a sound-permeable membrane 3. The waterproof and sound-permeable membrane 3 assembly has a water pressure resistance of 33 kPa and a sound blocking capacity of 0.8 dB@100-10000 Hz.

[0147] The sound-permeable membrane 3 is bonded between the first adhesive 1 and the second adhesive 2. Both the first adhesive 1 and the second adhesive 2 are annular, and the widths of the first adhesive 1 and the second adhesive 2 are equal. Both the first adhesive 1 and the second adhesive 2 are double-sided adhesives, each including an adhesive layer 12 and a substrate layer 11 disposed along its thickness direction. The adhesive layer 12 is located on both sides of the substrate layer 11. Part of the adhesive in the adhesive layer 12 seeps into the membrane pores of the sound-permeable membrane 3.

[0148] The dynamic shear strength of the adhesive layer 12 is 1000 kPa, and the displacement of the adhesive in the adhesive layer 12 is 1.2 mm; the thickness of the adhesive layer 12 is 50 μm, and the ratio of the thickness of the substrate layer 11 to the thickness of the adhesive layer 12 is 0.6; the bonding strength of the adhesive layer 12 is 25 N / 25 mm.

[0149] The elastic modulus of the substrate layer 11 is 250 MPa, the elastic limit deformation of the substrate layer 11 is 4%, and the Vickers hardness of the substrate layer 11 is 60 HV.

[0150] The width of the first adhesive component 1 is 2.5 mm, the inner diameter of the first adhesive component 1 is 2 mm, and the inner diameter of the first adhesive component 1 is 40% of the outer diameter.

[0151] The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, a portion of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area 31. The average thickness of the permeation area 31 is 6 μm, and the average width of the permeation area 31 is 2.5 mm.

[0152] The sound-permeable membrane 3 is a polypropylene membrane. The diameter of the sound-permeable membrane 3 is twice the inner diameter of the first adhesive component 1. The thickness of the sound-permeable membrane 3 is 10 μm. The surface roughness of the sound-permeable membrane 3 is Ra = 0.35 μm. The pore size of the sound-permeable membrane 3 is 5 μm. The porosity of the sound-permeable membrane 3 is 50%. The diameter of the sound-permeable membrane 3 is 5 mm. The basis weight of the sound-permeable membrane 3 is 9 g / m2. The difference between the surface energy of the outer surface of the sound-permeable membrane 3 and the surface tension of the adhesive layer 12 is 10 mN / m. The surface energy of the outer surface of the sound-permeable membrane 3 is 20 mN / m. The surface tension of the adhesive layer 12 is 10 mN / m.

[0153] The performance of the waterproof and sound-permeable membrane components in Examples 1 to 7 and Comparative Examples 1 to 2 was tested respectively, and the test results are shown in the table below:

[0154]

[0155] The test results above show that, compared with the waterproof and sound-permeable membrane assembly whose width of the adhesive area 4 is 25% greater than the width of the first adhesive part 1 (Comparative Example 1), compared with the waterproof and sound-permeable membrane assembly whose width of the adhesive area 4 is less than 10 times the thickness of the sound-permeable membrane (Comparative Example 2), and compared with the waterproof and sound-permeable membrane assembly without an adhesive area (Comparative Example 3), the waterproof and sound-permeable membrane assemblies provided in Examples 1 to 7 of this application do not exhibit delamination and also have good sound transmission and airtightness.

[0156] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A waterproof and sound-permeable membrane assembly, comprising a first adhesive member, a second adhesive member, and a sound-permeable membrane, wherein the sound-permeable membrane is bonded between the first adhesive member and the second adhesive member. Its features are: The edge region of the first adhesive component is bonded to the edge region of the second adhesive component, and the area where the first adhesive component and the second adhesive component are directly bonded is the encapsulation area. The side of the sound-permeable membrane is isolated from the outside through the encapsulation area. The width of the encapsulated area is not less than 10 times the thickness of the acoustic membrane, and the width of the encapsulated area is not more than 25% of the width of the first adhesive component.

2. The waterproof and sound-permeable membrane assembly as described in claim 1, characterized in that, The thickness of the acoustic membrane is 8-30 μm, and the width of the first adhesive component is 0.5-3 mm.

3. The waterproof and sound-permeable membrane assembly as described in claim 1, characterized in that, The inner diameter of the first adhesive component is 1.5-2.5 mm, and the inner diameter of the first adhesive component is 30-50% of the outer diameter; The diameter of the sound-permeable membrane is 1.5-3 times the inner diameter of the first adhesive component.

4. The waterproof and sound-permeable membrane assembly as described in claim 1, characterized in that, Both the first adhesive and the second adhesive are double-sided adhesives, each including an adhesive layer and a substrate layer disposed along its thickness direction; the adhesive layer is located on both sides of the substrate layer. The area where the first adhesive component is bonded to the acoustic membrane is called the adhesive membrane area. Within the adhesive membrane area, part of the adhesive layer penetrates into the pores of the acoustic membrane to form a permeation area. The dynamic shear strength of the adhesive layer is 700-1200 kPa, and the displacement of the adhesive in the adhesive layer is 0.3-2 mm.

5. The waterproof and acoustically permeable membrane assembly as described in claim 4, characterized in that, The thickness of the adhesive layer is 20-60 μm, and the ratio of the thickness of the substrate layer to the thickness of the adhesive layer is 0.4-0.7; and / or, The average thickness of the permeation zone is 4-15 μm, and the average thickness of the permeation zone is not less than 50% of the membrane thickness; and / or, The average width of the penetration zone is 0.4-3 mm, and the average width of the penetration zone is 75%-100% of the width of the first adhesive.

6. The waterproof and acoustically permeable membrane assembly as described in claim 4, characterized in that, The elastic modulus of the substrate layer is 50-300 MPa, the elastic limit deformation of the substrate layer is 0.5%-5%, and the Vickers hardness of the substrate layer is 40-70 HV.

7. The waterproof and acoustically permeable membrane assembly as described in claim 4, characterized in that, The difference between the surface energy of the outer surface of the sound-permeable membrane and the surface tension of the adhesive layer is 5-15 mN / m; The surface roughness of the acoustic membrane is Ra = 0.15um-0.55um.

8. The waterproof and acoustically permeable membrane assembly as described in claim 7, characterized in that, The surface energy of the outer surface of the sound-permeable membrane is 20-35 mN / m, and the surface tension of the adhesive layer is 10-20 mN / m.

9. The waterproof and acoustically permeable membrane assembly as described in claim 1, characterized in that, The sound-permeable membrane has a pore size of 0.1-10 μm, a porosity of 30-70%, a diameter of 1-5 mm, and a basis weight of 3-12 g / m³. 2 .

10. The waterproof and acoustically permeable membrane assembly as described in claim 1, characterized in that, The sound-permeable membrane is any one of nylon membrane, polyethylene membrane, polypropylene membrane, polytetrafluoroethylene membrane, and polyimide membrane; The waterproof and sound-permeable membrane assembly has a water pressure resistance greater than 20 kPa.

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