Powder-leakage-proof acoustic enhancement material having air-permeable barrier film, loudspeaker, and electronic device

Abstract

The present disclosure provides a powder-leakage-proof acoustic enhancement material having an air-permeable barrier film, a loudspeaker, and an electronic device. The powder-leakage-proof acoustic enhancement material having the air-permeable barrier film comprises a basic acoustic enhancement material and the air-permeable barrier film encapsulating or covering the basic acoustic enhancement material, wherein the air-permeable barrier film has a Gurley air permeability of less than 10 s, a thickness of less than 80 μm, and a maximum pore size of no greater than 50 μm. The powder-leakage-proof acoustic enhancement material having the air-permeable barrier film provided in the present disclosure does not occupy additional precious space in a rear cavity of the loudspeaker while preventing powder leakage, eliminates the need to increase the amount of a binder for enhancing strength and preventing powder shedding at the expense of partially compromising acoustic performance, and can even allow for a reduction in the amount of the binder to a certain extent, improving the utilization of the rear cavity of the loudspeaker, and increasing the filling amount of the acoustic enhancement material per unit volume of the rear cavity, thereby improving the acoustic performance to a certain extent.

Description

Leak-proof powder acoustic enhancement material with air-permeable barrier film, loudspeaker and electronic device

[0001] Related applications

[0002] This application claims priority to Chinese Utility Model Patent Application No. 202422355027.4, filed on September 26, 2024, and incorporates by reference the entire disclosure of the aforementioned patent application as part of this application. TECHNICAL FIELD

[0003] The present disclosure relates to a leak-proof powder acoustic enhancement material with air-permeable barrier film, loudspeaker and electronic device, belonging to the technical field of materials, in particular, acoustic materials. BACKGROUND

[0004] With the development of technology, people have higher and higher requirements for loudspeakers, especially mobile phone loudspeakers. Not only are they required to be small in size and have sound, but they are also required to provide good sound quality while being small in size. The quality of sound is related to various aspects of loudspeaker design and manufacturing process, especially the size of the loudspeaker back cavity. Generally, reducing the loudspeaker back cavity will significantly reduce the response of the low frequency band, resulting in poor sound quality. Therefore, it is difficult to provide good sound quality under the condition of a small back cavity.

[0005] To solve the above-mentioned contradiction, engineers have proposed various methods, such as: 1) replacing air with a gas with better acoustic compliance to create a back cavity atmosphere; 2) filling the back cavity with traditional high-porosity low-density porous materials, such as melamine foam, open-cell polyurethane sponge, aerogel, etc., to increase acoustic compliance; 3) filling materials containing micropores (here, micropores refer to pores with a pore size of less than 2 nm according to the definition of the International Union of Pure and Applied Chemistry, not the micropores of the commonly used microporous plate in the field of acoustics or the macroscopic acoustic micropores), such as activated carbon, zeolite, silica, etc. porous materials to increase the virtual back cavity volume and improve acoustic compliance. Among them, the third technical means has the most obvious effect.

[0006] For example, EP2424270A discloses an acoustic enhancement material which is a zeolite molecular sieve primary powder or particle of 0.5-2 μm to which 1-20% of a high molecular binder or glue is added, and is bonded to become a zeolite particle containing 1-30 μm air permeable holes. The addition of the high molecular binder or glue can significantly affect the acoustic performance and stability of the zeolite molecular sieve particle. In order to better exert the acoustic enhancement performance of the zeolite particle, it is necessary to reduce the influence of the high molecular binder or glue, and in addition to improving the quality of the zeolite particle, it is also necessary to bond the zeolite molecular sieve particle with as little binder as possible. Generally, acrylate, butyl benzene, polyurethane and other super strong adhesive binders which are often used in the industry and have good bonding effect are selected, but with the light and thin of electronic consumer goods, the volume and thickness left for the loudspeaker are being compressed, resulting in a thinner and irregular back cavity of the loudspeaker. The separation structure of the loudspeaker cavity inside the single body and the back cavity, such as a flexible high molecular mesh cloth, has been replaced by an integrated metal mesh, that is, the metal thin mesh is directly integrated with the single body. This structure design can save the volume of the back cavity, but it can cause the acoustic enhancement material to be directly rubbed with the rigid multi-angled metal mesh, resulting in significant wear and tear, and higher requirements for the strength and anti-dust of the acoustic enhancement material. In addition, although the volume of the loudspeaker is becoming smaller and smaller, the requirement for its power effect is increasing, that is, small volume and large sound effect, the amplitude of the loudspeaker is getting larger and larger, and the back cavity is getting smaller and smaller, resulting in a more and more dramatic change in the sound pressure of the back cavity, and the acoustic enhancement material in the back cavity is also getting more and more intense, resulting in more and more serious wear and tear. The requirement for the strength of the acoustic enhancement material is also increasing. In order to meet the above two requirements, the binder content can only be increased to meet the strength and dust requirements of the acoustic enhancement material, but this will cause the acoustic performance to be sacrificed to some extent; another common way to improve the strength in this field is to seek a better and more matched binder, but this is difficult and has become a bottleneck, and progress is extremely slow.

[0007] Therefore, it has become a technical problem in the field to provide a new type of acoustic enhancement material with a breathable barrier film and a loudspeaker and electronic device. SUMMARY

[0008] In order to solve the above-mentioned shortcomings and deficiencies, the purpose of the present disclosure is to provide an acoustic enhancement material with a breathable barrier film and a loudspeaker and electronic device. The acoustic enhancement material with a breathable barrier film provided by the present disclosure can prevent powder leakage, does not occupy valuable loudspeaker back cavity space, does not need to increase the amount of binder to improve the strength and prevent dust, and does not sacrifice the acoustic performance to some extent, and can even reduce the amount of binder to some extent, improve the utilization rate of the loudspeaker back cavity, increase the filling amount of the acoustic enhancement material in the unit back cavity volume, and thus improve the acoustic performance to some extent.

[0009] To achieve the above object, in one aspect, the present disclosure provides a leak-proof acoustic enhancement material with a gas-permeable barrier film, wherein the leak-proof acoustic enhancement material with the gas-permeable barrier film comprises a basic acoustic enhancement material and a gas-permeable barrier film covering or coating the basic acoustic enhancement material, wherein the gas-permeable barrier film has a Gurley-air permeability (s / 100cc) less than 10 s, optionally less than 4 s, more optionally less than 1 s, a thickness less than 80 μm, optionally less than 60 μm, more optionally less than 50 μm, further optionally less than 40 μm, most optionally less than 30 μm, and a maximum pore size not greater than 50 μm, optionally less than 20 μm, more optionally less than 10 μm.

[0010] The gas-permeable barrier film in the leak-proof acoustic enhancement material with the gas-permeable barrier film provided by the present disclosure has small pores and can accommodate air molecules in and out at high frequencies.

[0011] As a specific embodiment of the leak-proof acoustic enhancement material with the gas-permeable barrier film above, the gas-permeable barrier film has a porosity not less than 50%, optionally greater than 65%.

[0012] As a specific embodiment of the leak-proof acoustic enhancement material with the gas-permeable barrier film above, the material of the gas-permeable barrier film comprises polypropylene (PP), polyethylene terephthalate (PET), or polyimide (PI), etc.

[0013] As a specific embodiment of the leak-proof acoustic enhancement material with the gas-permeable barrier film above, the gas-permeable barrier film comprises a planar structure and / or a curved surface structure. For example, when the basic acoustic enhancement material has a block shape and the cross section of the block shape is a rounded rectangle, the gas-permeable barrier film comprises both the planar structure and the curved surface structure.

[0014] As a specific embodiment of the leak-proof acoustic enhancement material with the gas-permeable barrier film above, the shape of the basic acoustic enhancement material comprises one or a combination of a block shape, a sheet shape, a microsphere, or a particle, etc.

[0015] As a specific embodiment of the leak-proof acoustic enhancement material with the gas-permeable barrier film above, the basic acoustic enhancement material comprises a porous material.

[0016] As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film, the porous material comprises one or more porous materials with acoustic properties, such as zeolite molecular sieve, MOF, COF, activated carbon, aerogel, and hydrogel.

[0017] As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film, the zeolite molecular sieve is a high-silicon molecular sieve, wherein the Si / M molar ratio is greater than 30, and M is a non-silicon element.

[0018] As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film, M includes Al, B, Ga, Ti, Zr, etc.

[0019] As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film, the basic acoustic enhancement material further comprises a skeleton structure matrix.

[0020] As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film, the skeleton structure matrix comprises one or a combination of more than one of fiber, foaming material, or elastic material. The fiber, foaming material, and elastic material are all conventional materials that can be obtained through commercial channels or prepared by using conventional preparation methods.

[0021] In order to introduce as little fiber as possible into the acoustic enhancement material, as an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film, the diameter of the fiber is less than 40 μm, optionally less than 10 μm, and more optionally less than 6 μm.

[0022] In order to improve the structural strength of the acoustic enhancement material (i.e., improve the structural stability of the acoustic enhancement material) and ensure its acoustic performance, it is necessary to introduce as little non-porous material component as possible into the acoustic enhancement material, that is, to introduce as little fiber and other skeleton structure matrix and breathable barrier film as possible (the thickness of the breathable barrier film is as thin as possible). As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film, the mass ratio of the fiber and other skeleton structure matrix to the porous material such as zeolite molecular sieve is less than 1:5, optionally less than 1:10, more optionally less than 1:20, and further optionally less than 1:40. The small amount of fiber and other skeleton structure matrix added to the acoustic enhancement material mainly serves to improve the structural strength of the acoustic enhancement material.

[0023] As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film according to the present disclosure, the fibers include natural fibers or chemical fibers.

[0024] As an embodiment of the above-mentioned acoustic enhancement material with a breathable barrier film according to the present disclosure, the natural fibers include plant fibers, animal fibers, or mineral fibers, such as cotton, hemp, pulp, wool, silk, asbestos, etc.; the chemical fibers include man-made fibers (also known as regenerated fibers), synthetic fibers, inorganic chemical fibers, and also composite fibers obtained by compounding two or more fibers, such as acetate fibers, regenerated cellulose fibers, regenerated protein fibers, polyester fibers, polyamide fibers, polyvinyl alcohol fibers, polyacrylonitrile fibers, polypropylene fibers, polyethylene fibers, polyvinyl chloride fibers, polyvinylidene fluoride fibers, polyphenylene sulfide fibers, polyimide (PI) fibers, PTFE fibers, polyamide-imide (PAI) fibers, aromatic polyamide fibers, polytetrafluoroethylene fibers, polybenzimidazole fibers, polyether ether ketone (PEEK) fibers, polypropylene-polyester composite polypropylene-polyester fibers, polyethylene-polyester composite polyethylene-polyester fibers, polyethylene-polypropylene composite polyethylene-polypropylene fibers, glass fibers, metal fibers, and carbon fibers, etc. Optionally, the fibers are composite fibers, and more optionally, the composite fibers are formed by two materials with different melting points. The composite fibers can be in a sheath-core configuration or other combined configurations. For the composite fibers in a sheath-core configuration, the core layer is generally a high-melting-point fiber, and the sheath layer is a low-melting-point fiber. During the curing and cross-linking process, the temperature needs to be heated to the melting point of the sheath layer fiber for cross-linking, and the heating temperature also needs to be significantly lower than the melting point of the core layer fiber, so as to ensure cross-linking and fiber form stability without complete melting and loss of fiber form.

[0025] In some embodiments of the present disclosure, the composite fibers include, but are not limited to, PE / PP, PE / PET, or PP / PET, etc.

[0026] In some embodiments of the present disclosure, the basic acoustic enhancement material can be a zeolite molecular sieve raw powder, which only contains zeolite molecular sieve, has a size generally below 30 μm (optionally 1-10 μm), and can be obtained by a conventional preparation method such as hydrothermal synthesis.

[0027] In another aspect, the present disclosure also provides a loudspeaker, which comprises one or more acoustic sensors, one or more housings, and the one or more acoustic sensors and the one or more housings combine to form a loudspeaker back cavity, wherein the above leakage-proof powder acoustic enhancement material with a gas-permeable barrier film is installed in the loudspeaker back cavity.

[0028] In yet another aspect, the present disclosure also provides an electronic device, wherein the loudspeaker of the electronic device is the above loudspeaker.

[0029] In the present disclosure, the above electronic device can be any electronic device containing a loudspeaker system. As a specific embodiment of the above electronic device of the present disclosure, the electronic device includes a smart phone, a TWS earphone, a headset, smart glasses, a smart watch, a VR device, an AR device, a tablet computer, a thin and light notebook computer, and the like electronic consumer goods, or a sound system, and the like. The sound system includes a home sound system or a car sound system, and the like.

[0030] Compared with the prior art, the present disclosure can achieve the following beneficial technical effects:

[0031] The leakage-proof powder acoustic enhancement material with a gas-permeable barrier film provided by the present disclosure can meet the requirement of no powder leakage under harsh strength requirements, and in the limited loudspeaker cavity space, the amount of binder in the acoustic enhancement material can be reduced, which can significantly reduce the influence of the binder on the acoustic performance on the one hand, and further increase the proportion of porous materials such as zeolite molecular sieve in the acoustic enhancement material, thereby further increasing the acoustic compliance of the air in the loudspeaker back cavity, so as to improve the performance of the loudspeaker in the low frequency band. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 is a schematic diagram of the structure of the anti-powder-leaking acoustic reinforcement material with a breathable barrier membrane provided in Embodiment 4 of this disclosure.

[0034] Figure 2 is a schematic diagram of the structure of the anti-powder-leakage acoustic reinforcement material with a breathable barrier membrane provided in Embodiment 9 of this disclosure.

[0035] Figures 3-5 are SEM images of the breathable barrier membranes used in Embodiments 1 and 2 of this disclosure.

[0036] Figures 6-8 are SEM images of the breathable barrier membrane used in Embodiment 3 of this disclosure.

[0037] Figures 9-11 are SEM images of the breathable barrier membrane used in Embodiment 4 of this disclosure.

[0038] Key reference numerals: 1. Breathable barrier membrane; 10. First breathable barrier membrane; 11. Second breathable barrier membrane; 20. Basic acoustic reinforcement material. Detailed Implementation

[0039] It should be noted that the term "comprising" and any variations thereof in the specification, claims, and accompanying drawings of this disclosure are intended to cover non-exclusive inclusion. For example, a process, method / workshop, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method / workshop, product, or device.

[0040] In this disclosure, the terms “upper,” “lower,” “inner,” “outer,” “middle,” “top,” and “bottom,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily used to better describe this disclosure and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0041] In addition, the above-mentioned terms can be used to represent other meanings in addition to the positional or positional relationship, for example, the term "upper" can also be used to represent a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present disclosure can be understood according to the specific circumstances.

[0042] In addition, in the description of the present application, unless otherwise specifically limited, the terms "set", "connected or connected" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0043] The "range" disclosed in the present disclosure is given in the form of lower limit and upper limit. There can be one or more lower limits, and one or more upper limits. A given range is defined by selecting a lower limit and an upper limit. The selected lower limit and upper limit define the boundaries of a particular range. All ranges defined in this way are combinable, that is, any lower limit can be combined with any upper limit to form a range. For example, for a particular parameter, the ranges 60-120 and 80-110 are listed, it is understood that the ranges 60-110 and 80-120 are also expected. In addition, if the minimum range value is 1 and 2, and the maximum range value is 3, 4 and 5, the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5.

[0044] In the present disclosure, unless otherwise specified, the numerical range "a-b" represents a shorthand representation of any real combination between a and b, where a and b are real numbers. For example, the numerical range "0-5" represents that all real numbers between "0-5" have been listed in the present disclosure, and "0-5" is only a shorthand representation of these numerical combinations.

[0045] In the present disclosure, unless otherwise specified, all embodiments and optional embodiments mentioned in the present disclosure can be combined with each other to form new technical solutions.

[0046] In the present disclosure, unless otherwise specified, all technical features and optional features mentioned in the present disclosure can be combined with each other to form new technical solutions.

[0047] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in combination with the drawings and embodiments. The following described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments, and are only used to illustrate the present disclosure, and should not be regarded as limiting the scope of the present disclosure. The examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure. If the specific conditions are not specified in the embodiments, the conventional conditions or the conditions recommended by the manufacturer are used. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0048] The acoustic enhancement material used in the embodiments of the present disclosure is as follows:

[0049] The original powder form acoustic enhancement material is ZSM-5 type zeolite molecular sieve, spherical, size (diameter) is 10 μm, the molar ratio of silicon and aluminum elements is 300, and the micropore size is 0.5-0.7 nm.

[0050] The first particle form acoustic enhancement material is prepared by using the original powder form acoustic enhancement material and polyurethane adhesive as raw materials, spherical or spherical-like, size (diameter) is 250-350 μm, and the content of the polyurethane adhesive accounts for 10% wt of the total weight of the first particle form acoustic enhancement material.

[0051] The second particle form acoustic enhancement material is prepared by using the original powder form acoustic enhancement material and polyurethane adhesive as raw materials, spherical or spherical-like, size (diameter) is 100-200 μm, and the content of the polyurethane adhesive accounts for 10% wt of the total weight of the second particle form acoustic enhancement material.

[0052] The third particle form acoustic enhancement material is prepared by using the original powder form acoustic enhancement material and polyurethane adhesive as raw materials, spherical or spherical-like, size (diameter) is 250-350 μm, and the content of the polyurethane adhesive accounts for 3% wt of the total weight of the third particle form acoustic enhancement material.

[0053] The fourth particle form acoustic enhancement material is prepared by using the original powder form acoustic enhancement material and silica sol adhesive as raw materials, spherical or spherical-like, size (diameter) is 250-350 μm, and the content of the silica sol adhesive accounts for 3% wt of the total weight of the first particle form acoustic enhancement material.

[0054] Fifth particle-shaped acoustic enhancement material: it is the zeolite molecular sieve particles containing only zeolite molecular sieve obtained by secondary crystallization (180℃) of the above-mentioned raw powder-shaped acoustic enhancement material, and the particle size is 250-350μm.

[0055] Sheet-shaped acoustic enhancement material: it is obtained by slurry stirring of the above-mentioned first particle-shaped acoustic enhancement material and PE / PET composite fiber, and then casting and curing.

[0056] Block-shaped acoustic enhancement material: it is obtained by slurry stirring of the above-mentioned first particle-shaped acoustic enhancement material, polyurethane adhesive and PE / PP composite fiber, and then molding and curing in a mold.

[0057] The above-mentioned selection of acoustic enhancement materials is only used to illustrate the technical solutions of the present disclosure and the outstanding technical effects thereof, and is not used to limit the protection scope of the present disclosure. A person skilled in the art can select the shape, size, core component, etc. of the acoustic enhancement material according to the needs to achieve the design purpose of the loudspeaker module.

[0058] Example 1

[0059] The present embodiment provides a leak-proof powder acoustic enhancement material with a breathable barrier film, which comprises a basic acoustic enhancement material and a breathable barrier film tightly covering / wrapping the basic acoustic enhancement material, wherein the basic acoustic enhancement material is the above-mentioned block-shaped acoustic enhancement material, the breathable barrier film is made of PP, has a thickness of 30μm, a maximum pore size of 50μm, a porosity of 85%, and a Gurley breathability of 0.1s, and the SEM image of the breathable barrier film is shown in FIGS. 3-5. As can be seen from FIGS. 3-5, the pores of the breathable barrier film are overlapped and crossed.

[0060] The preparation method of the leak-proof powder acoustic enhancement material with a breathable barrier film provided in the present embodiment comprises: wrapping and heat-sealing the block-shaped acoustic enhancement material with a breathable barrier film on a film wrapping machine to obtain a leak-proof powder high-efficiency acoustic enhancement material tightly wrapped with a breathable barrier film (which is a leak-proof powder breathable barrier piece).

[0061] Comparative Example 1

[0062] The present comparative example provides a mesh cloth tightly wrapped block-shaped acoustic enhancement material, which comprises a basic acoustic enhancement material and a mesh cloth tightly covering / wrapping the basic acoustic enhancement material, wherein the basic acoustic enhancement material is the above-mentioned block-shaped acoustic enhancement material, and the mesh cloth is a commercially available conventional product with a model number of SMESH B10. The mesh cloth has a thickness of 105μm, a pore size of 120μm, a porosity of 41%, and a Gurley breathability of 0.3s.

[0063] The preparation method of the tightly wrapped block-shaped acoustic enhancement material provided by the present comparative example comprises: wrapping and heat-sealing the block-shaped acoustic enhancement material on a film wrapping machine with the above-mentioned commercially available conventional mesh cloth to obtain the tightly wrapped block-shaped acoustic enhancement material.

[0064] Example 2

[0065] The present example provides a leak-proof powder acoustic enhancement material with a breathable barrier film, which comprises a base acoustic enhancement material and a breathable barrier film tightly covering / wrapping the base acoustic enhancement material, wherein the base acoustic enhancement material is the first particle-shaped acoustic enhancement material described above, the breathable barrier film is made of PP, has a thickness of 30 μm, a maximum pore size of 50 μm, a porosity of 85%, and a Gurley breathability of 0.1 s, and the SEM image of the breathable barrier film is shown in FIGS. 3-5. As can be seen from FIGS. 3-5, the pores of the breathable barrier film are overlapped and crossed.

[0066] The preparation method of the leak-proof powder acoustic enhancement material with a breathable barrier film provided by the present example comprises: preforming the breathable barrier film into an open container, then filling the first particle-shaped acoustic enhancement material into the open container and heat-sealing to complete the packaging, to obtain the leak-proof powder high-efficiency acoustic enhancement material tightly wrapped by the breathable barrier film (which is the leak-proof powder breathable barrier).

[0067] Comparative Example 2

[0068] The present comparative example first assembles a commercially available conventional mesh cloth product in the rear cavity of a commercially available 1115 type loudspeaker, and makes it in sealing connection with the multiple side wall housings of the rear cavity, so as to form a cavity together with the side wall housings of the rear cavity, which can be used to fill the above-mentioned first particle-shaped acoustic enhancement material, wherein the volume of the rear cavity of the commercially available 1115 type loudspeaker tooling is 1 cubic centimeter (also referred to as 1 cc). The cavity separates the particle-shaped acoustic enhancement material from the loudspeaker monomer. A certain amount of the above-mentioned first particle-shaped acoustic enhancement material is filled through the powder filling hole provided on the rear cavity. Among them, the model of the commercially available conventional mesh cloth product is SMESH B20, the thickness of the mesh cloth is 62 μm, the pore size is 68 μm, the porosity is 38%, and the Gurley breathability is 0.5 s.

[0069] Example 3

[0070] The embodiment provides a leak-proof powder acoustic enhancement material with a breathable barrier film, which comprises a basic acoustic enhancement material and a breathable barrier film tightly covering / wrapping the basic acoustic enhancement material, wherein the basic acoustic enhancement material is the original powder form acoustic enhancement material described above, the breathable barrier film is made of PI, has a thickness of 40 μm, a maximum pore size of 30 μm, a porosity of 65 %, and a Gurley breathability of 0.3 s, and the SEM diagram of the breathable barrier film is shown in FIGS. 6-8, wherein it can be seen from FIGS. 6-8 that the pores of the breathable barrier film are also overlapped and crossed.

[0071] The preparation method of the leak-proof powder acoustic enhancement material with the breathable barrier film provided by the embodiment comprises the following steps: pre-preparing the breathable barrier film into an open container, then filling the original powder form acoustic enhancement material into the open container and heat-sealing to complete packaging, so as to obtain the leak-proof powder high-efficiency acoustic enhancement material tightly wrapped by the breathable barrier film (which is a leak-proof powder breathable barrier piece).

[0072] Embodiment 4

[0073] The embodiment provides a leak-proof powder acoustic enhancement material with a breathable barrier film, and a structural schematic diagram of the leak-proof powder acoustic enhancement material is shown in FIG. 1, which comprises a basic acoustic enhancement material 20 and a breathable barrier film 1 tightly covering / wrapping the basic acoustic enhancement material, wherein the basic acoustic enhancement material 20 is the sheet layer form acoustic enhancement material described above, the breathable barrier film 1 is made of PET, has a thickness of 45 μm, a maximum pore size of 40 μm, a porosity of 50 %, and a Gurley breathability of 0.4 s, and the SEM diagram of the breathable barrier film 1 is shown in FIGS. 9-11, wherein it can be seen from FIGS. 9-11 that the pores of the breathable barrier film 1 are also overlapped and crossed.

[0074] The preparation method of the leak-proof powder acoustic enhancement material with the breathable barrier film provided by the embodiment comprises the following steps: stacking a plurality of sheet layer form acoustic enhancement materials and wrapping and heat-sealing the sheet layer form acoustic enhancement materials by using the breathable barrier film on a film wrapping machine, so as to obtain the leak-proof powder high-efficiency acoustic enhancement material tightly wrapped by the breathable barrier film (which is a leak-proof powder breathable barrier piece).

[0075] Test Example 1

[0076] In the test example, the leak-proof powder acoustic enhancement material with the breathable barrier film provided by the embodiments 1-4 of the present disclosure and the mesh cloth tightly wrapped block-shaped acoustic enhancement material provided by the comparative example 1 are respectively assembled into a commercially available 1115 type loudspeaker rear cavity, wherein the volume of the rear cavity of the commercially available 1115 type loudspeaker tooling is 1 cubic centimeter (also referred to as 1 cc), and then the acoustic performance of the loudspeaker and the commercially available 1115 type loudspeaker provided by the comparative example 2 is tested by using the existing conventional test method.

[0077] The test example also respectively provides the drop structure stability test for the leak-proof powder acoustic enhancement material provided by the air-permeable barrier film of the embodiments 1-4 of the present disclosure and the mesh cloth tightly wrapped block acoustic enhancement material provided by the comparative example 1, the mesh cloth cavity filled first particle form acoustic enhancement material provided by the comparative example 2, wherein the drop structure stability test includes the drop method 1 and the drop method 2 which are continuously performed:

[0078] The drop method 1 specifically includes: placing the sample to be tested into a 250g drop tool (about 160mm x 100mm x 90mm in length, width and height respectively, 316L in material, the sample groove upper cover is flat without protruding edges and corners) and freely dropping from a height of 10cm for 480,000 times (200,000 times for each of the front and back surfaces, and 2000 times for each of the four sides); after the drop is completed, the sample is disassembled and observed to determine whether the material strength meets the requirements;

[0079] The drop method 2 specifically includes: compared with the drop method 1, the drop height parameter is changed to 160cm, and freely dropping for 600 times (200 times for each of the front and back surfaces, and 50 times for each of the four sides); after the drop is completed, the sample is disassembled and observed to determine whether the material strength meets the requirements.

[0080] Finally, the samples after the drop method 1 and the drop method 2 test are reassembled into the rear cavity of a commercially available 1115 type loudspeaker or the cavity formed by the commercially available conventional mesh cloth and the rear cavity side wall shell in the comparative example 2, wherein the volume of the rear cavity of the commercially available 1115 type loudspeaker tool is 1 cubic centimeter (also called 1cc), and the acoustic performance test is performed on the commercially available 1115 type loudspeaker using the existing conventional test method.

[0081] In the test example, the data involved in the process of the acoustic performance test and the drop structure stability test and the test data are shown in Table 1.

[0082] Table 1

[0083] Note: In Table 1, OK means passing this test; NG means not passing this test; the powder dropping degree from no powder dropping, slight powder dropping, powder dropping, to serious powder dropping is getting worse. ΔF01=F0 空 -F01, ΔF02=F0 空 -F02.

[0084] As can be seen from Table 1, in the drop test, Comparative Example 1 and Comparative Example 2 can only pass the mild Method 1 drop test, and both fail (i.e., severe powder dropping) in the harsh Method 2 drop test; while Example 1-4 of the present disclosure can pass both drop test evaluation methods, which indicates that compared to Comparative Example 1 and Comparative Example 2, the strength and powder dropping of the acoustic enhancement material provided by Example 1-4 using the breathable barrier film, i.e., the anti-dust acoustic enhancement material with a breathable barrier, is greatly improved, and can meet the increasingly harsh use environment, such as the rear cavity of a loudspeaker with a metal mesh.

[0085] As can also be seen from Table 1, whether before or after the drop structure stability test, the acoustic performance of the anti-dust acoustic enhancement material with a breathable barrier film provided by Example 1-4 of the present disclosure is better than that of Comparative Example 1 and Comparative Example 2, and after the drop structure stability test, the acoustic performance of the anti-dust acoustic enhancement material with a breathable barrier film provided by Example 1-4 of the present disclosure hardly loses, while the acoustic performance of Comparative Example 1 and Comparative Example 2 loses greatly after the drop structure stability test, and has been significantly worse than the acoustic performance of the anti-dust acoustic enhancement material with a breathable barrier film provided by Example 1-4 of the present disclosure.

[0086] Example 5

[0087] The present example provides an anti-dust acoustic enhancement material with a breathable barrier film, which is different from Example 2 only in that the basic acoustic enhancement material is different, and the basic acoustic enhancement material used in the present example is the second particle form acoustic enhancement material described above.

[0088] Example 6

[0089] The present example provides an anti-dust acoustic enhancement material with a breathable barrier film, which is different from Example 2 only in that the basic acoustic enhancement material is different, and the basic acoustic enhancement material used in the present example is the third particle form acoustic enhancement material described above.

[0090] Test Example 2

[0091] In the present test example, the second particle form acoustic enhancement material, the anti-dust acoustic enhancement material with a breathable barrier film provided by Example 5, the third particle form acoustic enhancement material, and the anti-dust acoustic enhancement material with a breathable barrier film provided by Example 6 are respectively assembled into a commercially available 1115 type loudspeaker rear cavity, wherein the volume of the commercially available 1115 type loudspeaker tooling rear cavity is 1 cubic centimeter (also referred to as 1 cc). When assembling the second particle form acoustic enhancement material and the third particle form acoustic enhancement material, the loudspeaker tooling rear cavity is first separated into a rear cavity using a commercially available conventional mesh, and then the aforementioned materials are filled. The acoustic performance of the commercially available 1115 type loudspeaker is tested using the existing conventional test method.

[0092] Meanwhile, the test example also respectively tests the second granular acoustic enhancement material, the acoustic enhancement material with the air-permeable barrier film provided by the embodiment 5, the third granular acoustic enhancement material and the acoustic enhancement material with the air-permeable barrier film provided by the embodiment 6 according to the method in the test example 1.

[0093] Finally, the samples after the drop method 1 and the drop method 2 tests are reassembled into the back cavity of the commercially available 1115 type loudspeaker according to the method shown in the test example, and the acoustic performance of the commercially available 1115 type loudspeaker is tested by using the existing conventional test method.

[0094] In the test example, the data involved in the acoustic performance test and the drop structure stability test process and the test data are shown in Table 2.

[0095] Table 2

[0096] Note: OK means passing this test; NG means not passing this test; the powder dropping degree from no powder dropping, slight powder dropping, powder dropping, to serious powder dropping is worse and worse. ΔF01=F0 空 -F01, ΔF02=F0 空 -F02.

[0097] As can be seen from Table 2, after the size of the microspheres in the acoustic enhancement material sample is reduced or the glue content is reduced by using the technical solution of the present disclosure, the acoustic enhancement material sample can still exhibit more excellent effect in the drop test under the premise of ensuring the acoustic performance. Specifically, compared with the third granular acoustic enhancement material which cannot pass the relatively mild method 1 drop test, the sample provided by the embodiment 6 of the present disclosure can pass the relatively mild method 1 and the harsh method 2 drop test process; compared with the second granular acoustic enhancement material which cannot pass the harsh method 2 drop test, the sample provided by the embodiment 5 of the present disclosure can also pass the harsh method 2 drop test process; that is, the samples provided by the embodiments 5 and 6 of the present disclosure can pass the two drop methods tests, which indicates that the strength and powder dropping of the material are greatly improved after using the air-permeable barrier of the leak-proof powder, and can meet the increasingly harsh use environment, such as the loudspeaker back cavity with a metal mesh.

[0098] In addition, it can also be seen from Table 2 that the acoustic performance of the leak-proof powder acoustic enhancement material with the air-permeable barrier film provided by Embodiment 5 and Embodiment 6 has little loss after the drop structure stability test, while the acoustic performance of the second particle morphology acoustic enhancement material and the third particle morphology acoustic enhancement material has a greater loss after the drop structure stability test, and the acoustic performance thereof is obviously poorer than that of the leak-proof powder acoustic enhancement material with the air-permeable barrier film provided by Embodiment 5 and Embodiment 6, respectively.

[0099] Embodiment 7

[0100] The embodiment provides a leak-proof powder acoustic enhancement material with an air-permeable barrier film, which is different from Embodiment 2 only in that the basic acoustic enhancement material is different, and the basic acoustic enhancement material used in the embodiment is the fourth particle morphology acoustic enhancement material described above.

[0101] Embodiment 8

[0102] The embodiment provides a leak-proof powder acoustic enhancement material with an air-permeable barrier film, which is different from Embodiment 2 only in that the basic acoustic enhancement material is different, and the basic acoustic enhancement material used in the embodiment is the fifth particle morphology acoustic enhancement material described above.

[0103] Test Example 3

[0104] In the test example, the fourth particle morphology acoustic enhancement material, the leak-proof powder acoustic enhancement material with the air-permeable barrier film provided by Embodiment 7, the fifth particle morphology acoustic enhancement material, and the leak-proof powder acoustic enhancement material with the air-permeable barrier film provided by Embodiment 8 are respectively assembled into a commercially available 1115 type loudspeaker back cavity, wherein the volume of the commercially available 1115 type loudspeaker tooling back cavity is 1 cubic centimeter (also referred to as 1 cc). When the fourth particle morphology acoustic enhancement material and the fifth particle morphology acoustic enhancement material are tested, the commercially available conventional mesh is first used to separate the back cavity, and then the aforementioned materials are filled. The acoustic performance of the commercially available 1115 type loudspeaker is tested by using the existing conventional test method.

[0105] Meanwhile, the test example also performs a drop structure stability test on the fourth particle morphology acoustic enhancement material, the leak-proof powder acoustic enhancement material with the air-permeable barrier film provided by Embodiment 7, the fifth particle morphology acoustic enhancement material, and the leak-proof powder acoustic enhancement material with the air-permeable barrier film provided by Embodiment 8 by referring to the method in Test Example 1.

[0106] Finally, the samples after the drop method 1 and drop method 2 tests are reassembled into the back cavity of a commercially available 1115 type loudspeaker according to the method shown in the above test example, wherein the volume of the tooling back cavity of the commercially available 1115 type loudspeaker is 1 cubic centimeter (also referred to as 1 cc), and then the acoustic performance of the commercially available 1115 type loudspeaker is tested using the existing conventional test method.

[0107] In the test example, the data involved in the acoustic performance test and the drop structure stability test process and the test data are shown in Table 3.

[0108] Table 3

[0109] Note: OK means passing this test; NG means failing this test; the powder dropping degree is from no powder dropping, slight powder dropping, powder dropping, to serious powder dropping in turn. ΔF01 = F0 空 F01, ΔF02 = F0 空 F02.

[0110] As can be seen from Table 3, compared with the fourth particle form acoustic reinforcing material and the fifth particle form acoustic reinforcing material, the leak-proof powder acoustic reinforcing material with the air-permeable barrier film prepared by using the technical solution of the present disclosure in Example 7 and Example 8 can still ensure the acoustic performance and make the sample show more excellent effect in the drop test. Compared with the non-high molecular binder microspheres or particles (inorganic binder or secondary crystallized fully crystallized molecular sieve particles) with serious powder dropping in the drop test, i.e. the fourth particle form acoustic reinforcing material and the fifth particle form acoustic reinforcing material, the leak-proof powder acoustic reinforcing material provided by Example 7 and Example 8 of the present disclosure after using the leak-proof powder air-permeable barrier can pass the ordinary drop test and the severe drop test, which not only makes the non-high molecular binder microspheres or particles that cannot be practically applied due to powder dropping can be practically applied, but also the presence of the high molecular binder can block the surface of the zeolite molecular sieve and limit the further improvement of the density of the particles or microspheres. In the field of electronic consumer goods such as mobile phones, the limiting factor for the loudspeaker cavity is the volume, not the mass. Through the technical solution provided by the present disclosure, acoustic reinforcing materials with better acoustic performance and strength can be developed.

[0111] In addition, as can be seen from Table 3, the acoustic performance of the leak-proof powder acoustic reinforcing material with the air-permeable barrier film provided by Example 7 and Example 8 of the present disclosure has almost no loss after the drop structure stability test, while the acoustic performance of the fourth particle form acoustic reinforcing material and the fifth particle form acoustic reinforcing material has a large loss after the drop structure stability test, and the acoustic performance thereof is obviously poorer than that of the leak-proof powder acoustic reinforcing material with the air-permeable barrier film provided by Example 7 and Example 8.

[0112] Example 9

[0113] The present embodiment provides a leak-proof powder acoustic enhancement material with air-permeable barrier films, the structural diagram of which is shown in FIG. 2, which comprises a base acoustic enhancement material 20 and two air-permeable barrier films, respectively denoted as a first air-permeable barrier film 10 and a second air-permeable barrier film 11. The base acoustic enhancement material 20 is a sheet-shaped acoustic enhancement material formed by the above-mentioned original powder form acoustic enhancement material, and the first air-permeable barrier film 10 and the second air-permeable barrier film 11 cover the upper surface and the lower surface of the base acoustic enhancement material 20 respectively. The two air-permeable barrier films are of the same material, both of which are PI, with a thickness of 40 μm, a maximum pore size of 30 μm, a porosity of 65%, and a Gurley air permeability of 0.3 s.

[0114] The preparation method of the leak-proof powder acoustic enhancement material with air-permeable barrier films provided by the present embodiment comprises: first dispersing the original powder form acoustic enhancement material in a solvent to prepare a thick slurry (the mass fraction of the original powder form acoustic enhancement material is 70% based on the total weight of the thick slurry), then directly coating 200 μm thick slurry on the second air-permeable barrier film, covering the first air-permeable barrier film on the slurry, and then performing roll drying and slitting, and sealing the slitting edges with glue to obtain the leak-proof powder acoustic enhancement material with air-permeable barrier films.

[0115] Test Example 4

[0116] In the present test example, the multi-layered leak-proof powder acoustic enhancement material with air-permeable barrier films provided by Example 9 is filled in the rear cavity of a commercially available 1115 type loudspeaker, wherein the rear cavity volume of the commercially available 1115 type loudspeaker tooling is 1 cubic centimeter (also referred to as 1 cc), and then the acoustic performance of the commercially available 1115 type loudspeaker is tested by using the existing conventional test method.

[0117] Meanwhile, the leak-proof powder acoustic enhancement material with air-permeable barrier films provided by Example 9 is also tested for drop structure stability by referring to the method in Test Example 1.

[0118] Finally, the samples after the drop method 1 and drop method 2 tests are reassembled into the rear cavity of the commercially available 1115 type loudspeaker according to the method shown in the present test example, wherein the rear cavity volume of the commercially available 1115 type loudspeaker tooling is 1 cubic centimeter (also referred to as 1 cc), and then the acoustic performance of the commercially available 1115 type loudspeaker is tested by using the existing conventional test method.

[0119] In the present test example, the data involved in the process of acoustic performance test and drop structure stability test, and the test data are shown in Table 4.

[0120] Table 4

[0121] Note: OK means passing this test. ΔF01 = F0 空 - F01, ΔF02 = F0 空 - F02.

[0122] As can be seen from Table 4, the leak-proof powder acoustic enhancement material provided by the embodiment 9 of the present disclosure with the air-permeable barrier film can also pass the drop structure stability test according to method 1 and method 2, the test results show that there is no powder leakage and no fragmentation, and after the drop structure stability test, the acoustic performance is almost not lost.

[0123] As can be seen from the embodiment 3 and embodiment 9 of the present disclosure and Table 1 and Table 4, the present disclosure can tightly wrap the leak-proof powder air-permeable barrier, i.e. the air-permeable barrier film, on the multi-layer sheet layer form acoustic enhancement material to form a whole filled in the back cavity, i.e. the leak-proof powder acoustic enhancement material with the air-permeable barrier film of the embodiment 3, and can also adhere the leak-proof powder air-permeable barrier, i.e. the air-permeable barrier film, to the single-layer sheet layer form acoustic enhancement material to obtain the leak-proof powder acoustic enhancement material with the air-permeable barrier film, and then stack the leak-proof powder acoustic enhancement material with the air-permeable barrier film in multiple layers to be filled in the back cavity. At the same time, the thickness of the leak-proof powder acoustic enhancement material with the air-permeable barrier film filled in the back cavity can be adjusted according to the actual design needs, so that it can be applied to fill in a particularly narrow cavity space, and almost does not affect the acoustic performance.

[0124] The above is only a specific embodiment of the present disclosure, which cannot limit the scope of the invention. Therefore, the replacement of equivalent components or equivalent changes and modifications made within the scope of the present disclosure should still belong to the scope covered by the present patent.

Claims

1. A leakproof, sound-acoustic enhancing material having a breathable barrier film, characterized by, The leak-proof powder acoustic enhancement material with the air-permeable barrier film comprises a basic acoustic enhancement material and an air-permeable barrier film covering or coating the basic acoustic enhancement material, wherein the Gurley air permeability of the air-permeable barrier film is less than 10 s, the thickness of the air-permeable barrier film is less than 80 μm, and the maximum pore size of the air-permeable barrier film is not greater than 50 μm.

2. The leak-proof, powder acoustic enhancement material having a breathable barrier film of claim 1, wherein, The porosity of the air-permeable barrier film is not less than 50%.

3. The leak-proof, powder-acoustically-enhancing material with a breathable barrier film according to claim 1 or 2, characterized in that, The material of the air-permeable barrier film comprises polypropylene, polyethylene terephthalate or polyimide.

4. The leak-proof, powder-acoustics enhancing material with a breathable barrier film according to claim 1 or 2, characterized in that, The air-permeable barrier film comprises a planar structure and / or a curved surface structure.

5. The leak-proof, powder acoustic enhancement material having a breathable barrier film of claim 1, wherein, The shape of the basic acoustic enhancement material comprises one or a combination of a block, a sheet, a microsphere or a particle.

6. The leak-proof, powder acoustic enhancement material having a breathable barrier film of claim 1, wherein, The basic acoustic enhancement material comprises a porous material.

7. The leak-proof, powder acoustic enhancement material having a breathable barrier film of claim 6, wherein, The porous material comprises a zeolite molecular sieve, a MOF, a COF, activated carbon, an aerogel or a hydrogel.

8. The leak-proof, powder-acoustics enhancing material with a breathable barrier film according to claim 6 or 7, characterized in that, The basic acoustic enhancement material further comprises a skeleton structure matrix.

9. The leak-proof, powder acoustic enhancement material having a breathable barrier film of claim 8, wherein, The skeleton structure matrix comprises a fiber, a foaming material or an elastic material.

10. The leak-proof, powder acoustic enhancement material having a breathable barrier film of claim 9, wherein, The diameter of the fiber is less than 40 μm.

11. A loudspeaker comprising one or more acoustic sensors, one or more housings, the one or more acoustic sensors and the one or more housings in combination forming a loudspeaker back volume, characterized in that, The speaker back cavity is equipped with the leak-proof powder acoustic enhancement material with the air-permeable barrier film according to any one of claims 1-10.

12. An electronic device, comprising: The speaker of the electronic device is the speaker according to claim 11.

13. The electronic device of claim 12, wherein, The electronic device comprises a smartphone, a TWS earphone, a headset, smart glasses, a smartwatch, a VR device, an AR device, a tablet computer, a thin and light notebook computer or a sound equipment.

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