Rubber diaphragm and preparation method therefor, and sound-making device

Abstract

The present invention relates to the field of new materials, and provides a rubber diaphragm and a preparation method therefor, and a sound-making device. The rubber diaphragm consists of main-body rubber, a distortion improver, a vulcanizing agent, an accelerant, a reinforcing filler and other processing aids, wherein the distortion improver is a substance that has a number-average molecular weight ranging from 1,000 to 1,000,000, and the structure of the distortion improver has special chemical crosslinking points capable of participating in the vulcanization reaction of rubber; the content of the special chemical crosslinking points accounts for 0.01-30% of the mass of the distortion improver; the addition amount of the distortion improver accounts for 0.1-100% of the mass of the main-body rubber; and the distortion improver improves distortion at a frequency band of 0.1-20,000 HZ. A special distortion improver is selected and used in the rubber diaphragm provided by the present invention, thereby solving the problems of molecular migration, poor reliability, a high change rate of modulus, poor mechanical properties of rubber, etc., in traditional modification methods.

Description

Rubber sound membrane, preparation method thereof, and sound-generating device Technical Field

[0001] The present invention relates to the field of new materials, and in particular to a rubber sound membrane, a preparation method thereof, and a sound-generating device. Background Art

[0002] With the rapid development of electronic technology and the improvement of people's living standards, consumers are demanding higher and higher sound quality from sound-generating devices. Reducing the distortion (THD) of sound-generating devices within specific frequency bands and improving their sound quality are gaining increasing attention from researchers. As a key component of sound-generating devices, membrane materials can significantly reduce THD by manipulating their structure and properties. Technical issues

[0003] Due to their unique physical properties, rubber diaphragms have gained popularity in high-end sound-generating devices. However, traditional rubber diaphragms are ineffective in improving the distortion performance of sound-generating devices, which has limited their widespread application. To improve the distortion characteristics of sound-generating devices, technicians in related fields have conducted extensive testing and application research on diaphragm materials and proposed various modification methods, such as adding fillers (such as flake fillers), resin blending modification, and the use of rubber. While these methods can improve the distortion of sound-generating devices to a certain extent, they can also lead to problems such as increased F0 or significant temperature fluctuations, poor mechanical properties, and poor reliability and dimensional stability.

[0004] Therefore, this field urgently needs a device with good reliability, excellent macroscopic physical properties, and the ability to significantly reduce distortion (THD) in the low frequency band while maintaining good frequency response characteristics, thereby effectively improving the acoustic quality of the sound-generating device. Technical Solutions

[0005] The purpose of the present invention is to provide a rubber sound diaphragm and a preparation method thereof, as well as a sound-generating device, in order to solve the problem of poor distortion performance of the sound diaphragm in the sound-generating device in the prior art.

[0006] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a rubber sound diaphragm, wherein the components of the rubber sound diaphragm are composed of a main rubber, a distortion improver, a vulcanizing agent, an accelerator, a reinforcing filler and other processing aids;

[0007] The distortion improver is a substance having a number average molecular weight between 1,000 and 1,000,000, and the structure of the distortion improver has special chemical crosslinking points that can participate in the rubber vulcanization reaction;

[0008] The added amount of the distortion improver accounts for 0.1%-100% of the mass of the main rubber;

[0009] The content of the special chemical cross-linking points accounts for 0.0.1%-30% of the mass of the distortion improver;

[0010] The distortion improving agent improves the distortion in a frequency band of 0.1HZ-20000HZ;

[0011] The amount of the vulcanizing agent added is 0.001%-10% of the mass of the main rubber;

[0012] The amount of the accelerator added is 0.1%-10% of the mass of the main rubber;

[0013] The added amount of the reinforcing filler accounts for 5%-150% of the mass of the main rubber;

[0014] The addition amount of the other processing aids accounts for 1%-50% of the mass of the main rubber; the other processing aids include one or more of release agents, antioxidants, anti-aging agents, plasticizers, dispersants, anti-scorching agents, dispersing aids and activators.

[0015] Preferably, the special chemical cross-linking points in the distortion improver include one or more of double bonds, triple bonds, isocyanate groups, silicon hydrogen bonds, silicon chlorine bonds, azide groups, epoxy groups, nitrile groups, siloxane groups, carboxyl groups, hydroxyl groups, amide groups, amino groups, acid chloride groups and acid anhydride groups.

[0016] Preferably, the main rubber includes one or more of nitrile rubber, hydrogenated nitrile rubber, butyl rubber, styrene butadiene rubber, natural rubber, chloroprene rubber, EPDM rubber, EPDM rubber, butadiene rubber, acrylate rubber, ethylene acrylate rubber, chlorosulfonated polyethylene, silicone rubber and fluororubber.

[0017] In a second aspect, the present invention further provides a method for preparing the rubber sound membrane as described in any one of the above embodiments, wherein the method for preparing the rubber sound membrane comprises the following steps:

[0018] Step S1, masticating the raw rubber through an open mill or an internal mixer to obtain a plasticized rubber as the main rubber;

[0019] Step S2, blending the reinforcing filler, the vulcanizing agent, the accelerator, the distortion improving agent, and the other processing aids with the plasticized rubber through a blending device according to the components of the rubber sound membrane to obtain a blended rubber material;

[0020] Step S3, forming a film by rolling or hot pressing the blended rubber material through a casting method;

[0021] Step S4: vulcanize and mold the diaphragm to form the rubber sound diaphragm.

[0022] Preferably, in step S2, the blending method includes one or more of solid-solid blending, solid-liquid blending and liquid-liquid blending; and the blending equipment includes one or more of a rubber open mixer, a rubber internal mixer and a planetary mixer.

[0023] Preferably, the step S2 includes the following sub-steps: weighing the components according to the components of the rubber sound membrane: 100 parts of the plasticizer, 10-100 parts of the reinforcing filler, 0.3-15 parts of the other processing aids, 1-100 parts of the distortion improver, 0.1-10 parts of the vulcanizer, and 0.1-10 parts of the accelerator;

[0024] The components are added in sequence using the blending equipment at 25° C.-100° C., and the next component is added 3 min-10 min after each addition of one component. After all components are added, mixing is continued for 3 min-30 min.

[0025] Preferably, the other processing aids include one or more of a release agent, an antioxidant, an anti-aging agent, a plasticizer, a dispersant, a scorch inhibitor, a dispersing aid and an active agent; in the step of weighing the components according to the components of the rubber sound membrane, the other processing aids are: 0.1-5 parts of a release agent, 0.1-5 parts of an anti-scorch agent, and 0.01-5 parts of an anti-aging agent.

[0026] Preferably, in step S3, the blended rubber material is pressed into the diaphragm by a rubber plate vulcanizer at 25° C.-100° C. and 0.1 MPa-5 MPa.

[0027] Preferably, in the step S4, in which the diaphragm is vulcanized and molded, the molding reaction includes one or more of hot pressing molding, dissolution and coating molding, and injection molding; and the number of vulcanizations includes one or more.

[0028] Preferably, in step S4, the diaphragm is pressed into the rubber sound diaphragm by a sound diaphragm press at 180-210° C., 0.2 MPa, and 5 min-20 min.

[0029] In a third aspect, the present invention further provides a sound-generating device, wherein the sound-generating device is the rubber sound membrane as described in any one of the above embodiments. Beneficial effects

[0030] Compared to existing technologies, the rubber diaphragm provided by the present invention utilizes a special distortion-modifying agent. By regulating the chemical reaction between the distortion-modifying agent's specific chemical crosslinking points and a blended system of rubber, vulcanizers, or vulcanizing accelerators, the distortion-modifying agent is chemically bonded to the rubber's molecular structure. This solves the problems of molecular migration, poor reliability, high modulus change, and poor rubber mechanical properties that exist in traditional modification methods. Furthermore, by precisely controlling the structure and chemical reaction behavior of the distortion-modifying agent, the present invention enables the design and regulation of the rubber diaphragm's structure and performance, significantly improving the distortion characteristics of low-frequency sound-generating devices. Furthermore, sound-generating devices using the present invention's rubber diaphragm containing the distortion-modifying agent significantly reduce speaker distortion (THD) in the low-frequency range, improving sound quality while having virtually no impact on the resonant frequency (F0) response. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0032] FIG1 is a flow chart of a method for preparing a rubber sound membrane according to an embodiment of the present invention;

[0033] FIG2 is a schematic diagram of a THD curve of a loudspeaker manufactured using the rubber diaphragm of the present invention, provided in an embodiment of the present invention. Modes for Carrying Out the Invention

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] The present invention provides a rubber sound diaphragm, which is composed of a main rubber, a distortion improver, a vulcanizer, an accelerator, a reinforcing filler and other processing aids;

[0036] The distortion improver is a substance having a number average molecular weight between 1,000 and 1,000,000, and the structure of the distortion improver has special chemical crosslinking points that can participate in the rubber vulcanization reaction;

[0037] The content of the special chemical cross-linking points accounts for 0.0.1%-30% of the mass of the distortion improver;

[0038] The added amount of the distortion improver accounts for 0.1%-100% of the mass of the main rubber;

[0039] The distortion improving agent improves the distortion in a frequency band of 0.1HZ-20000HZ;

[0040] The amount of the vulcanizing agent added is 0.001%-10% of the mass of the main rubber;

[0041] The amount of the accelerator added is 0.1%-10% of the mass of the main rubber;

[0042] The added amount of the reinforcing filler accounts for 5%-150% of the mass of the main rubber;

[0043] The addition amount of the other processing aids accounts for 1%-50% of the mass of the main rubber; the other processing aids include one or more of release agents, antioxidants, anti-aging agents, plasticizers, dispersants, anti-scorching agents, dispersing aids and activators.

[0044] In this embodiment, the special chemical cross-linking points in the distortion improver include one or more of double bonds, triple bonds, isocyanate groups, silicon hydrogen bonds, silicon chlorine bonds, azide groups, epoxy groups, nitrile groups, siloxane groups, carboxyl groups, hydroxyl groups, amide groups, amino groups, acid chloride groups and acid anhydride groups.

[0045] In this embodiment, the main rubber includes one or more of nitrile rubber, hydrogenated nitrile rubber, butyl rubber, styrene butadiene rubber, natural rubber, chloroprene rubber, EPDM rubber, EPDM rubber, butadiene rubber, acrylate rubber, ethylene acrylate rubber, chlorosulfonated polyethylene, silicone rubber and fluororubber.

[0046] Referring to FIG. 1 , the present invention further provides a method for preparing the rubber sound membrane as in the above embodiment, the method comprising the following steps:

[0047] Step S1, masticating the raw rubber through an open mill or an internal mixer to obtain a plasticized rubber as the main rubber;

[0048] In this embodiment, according to the components of the rubber sound membrane, 100 parts of raw rubber are weighed and plasticized at 25° C.-100° C. for 3 min-30 min using an open mixer or an internal mixer.

[0049] Step S2, blending the reinforcing filler, the vulcanizing agent, the accelerator, the distortion improving agent, and the other processing aids with the plasticized rubber through a blending device according to the components of the rubber sound membrane to obtain a blended rubber material;

[0050] In this embodiment, the blending method includes one or more of solid-solid blending, solid-liquid blending and liquid-liquid blending; the blending equipment includes one or more of a rubber open mixer, a rubber internal mixer and a planetary mixer.

[0051] In this embodiment, the other processing aids include one or more of a release agent, an antioxidant, an anti-aging agent, a plasticizer, a dispersant, a scorch retarder, a dispersing aid, and an active agent; the step S2 includes the following sub-steps: weighing the components according to the components of the rubber sound membrane: 100 parts of the plasticizer, 10 parts to 100 parts of the reinforcing filler, 0.3 parts to 15 parts of the other processing aids, 1 part to 100 parts of the distortion improver, 0.1 parts to 10 parts of the vulcanizer, and 0.1 parts to 10 parts of the accelerator;

[0052] Use the blending equipment to add the components in sequence at 25° C.-100° C., add the next component 3 minutes to 10 minutes after each addition, and continue mixing for 3 minutes to 30 minutes after all are added.

[0053] In this embodiment, the other processing aids include one or more of a release agent, an antioxidant, an anti-aging agent, a plasticizer, a dispersant, a scorch inhibitor, a dispersing aid and an active agent; in the step of weighing the components according to the components of the rubber sound membrane, the other processing aids are: 0.1 to 5 parts of a release agent, 0.1 to 5 parts of an anti-scorch agent, and 0.01 to 5 parts of an anti-aging agent.

[0054] Step S3, forming a film by rolling or hot pressing the blended rubber material through a casting method;

[0055] In this embodiment, the blended rubber material is pressed into the diaphragm by a rubber plate vulcanizer at 25° C.-100° C. and 0.1 MPa-5 MPa.

[0056] Step S4: vulcanize and mold the diaphragm to form the rubber sound diaphragm.

[0057] In this embodiment, in the step of vulcanizing and molding the diaphragm, the molding reaction includes one or more of hot pressing molding, dissolution and coating molding, and injection molding; and the number of vulcanizations includes one or more times.

[0058] In this embodiment, the diaphragm is pressed into the rubber sound diaphragm by a sound diaphragm press at 180-210° C., 0.2 MPa, and 5 min-20 min.

[0059] The present invention also provides a sound-generating device comprising a diaphragm, a voice coil, a magnetic circuit system, and a supporting structure. The diaphragm is the aforementioned rubber diaphragm. Therefore, the sound-generating device can achieve the technical effects achieved by the aforementioned rubber diaphragm, and further details are omitted here.

[0060] In this embodiment, the sound-generating device can be applied to terminal devices such as mobile phones, smart watches, computers, speakers, televisions, and cars.

[0061] Compared to existing technologies, the rubber diaphragm provided by the present invention utilizes a special distortion-modifying agent. By regulating the chemical reaction between the distortion-modifying agent's specific chemical crosslinking points and a blended system of rubber, vulcanizers, or vulcanizing accelerators, the distortion-modifying agent is chemically bonded to the rubber's molecular structure. This solves the problems of molecular migration, poor reliability, high modulus change, and poor rubber mechanical properties that exist in traditional modification methods. Furthermore, by precisely controlling the structure and chemical reaction behavior of the distortion-modifying agent, the present invention enables the design and regulation of the rubber diaphragm's structure and performance, significantly improving the distortion characteristics of low-frequency sound-generating devices. Furthermore, sound-generating devices using the present invention's rubber diaphragm containing the distortion-modifying agent significantly reduce speaker distortion (THD) in the low-frequency range, improving sound quality while having virtually no impact on the resonant frequency (F0) response.

[0062] In order to better reflect the preparation method of the rubber sound membrane described above, the following is further illustrated by preparation examples. It should be understood that the specific examples described here are only used to explain the present invention, rather than to limit the present invention.

[0063] (Example 1)

[0064] In this embodiment, 100 parts of raw rubber containing carboxyl vinyl acrylate (AEM) was weighed and milled at 60° C. for 10 minutes using an open mill to obtain a plasticized rubber as the main rubber.

[0065] The rubber mill was heated to 70°C, 100 parts of plasticized rubber were added, 50 parts of reinforcing filler (N772 carbon black) were added in two portions, and the mixture was mixed for 5 minutes. 1.5 parts of antioxidant (stearic acid) and 0.5 parts of release agent (Armeen 18D) were added, and the mixture was mixed for 5 minutes. 1 part of release agent (Vanfre VAM) and 0.1 part of scorch retarder (CTP) were added, and the mixture was mixed for 3 minutes. 1 part of antioxidant (Naugard 445) was added, and the mixture was mixed for 3 minutes. 5 parts of distortion improver were added, and the mixture was mixed for 5 minutes. 1.5 parts of vulcanizing agent (Diak NO 1) and 4 parts of accelerator (DOTG) were added, and the mixture was mixed for 20 minutes to obtain a blended rubber compound.

[0066] The blended rubber material was pressed into a sheet using a rubber flat vulcanizer at 70° C. and 0.5 MPa.

[0067] The sheet was pressed into a rubber sound film using a sound film press at 200° C., 0.2 MPa, and 10 min.

[0068] (Example 2)

[0069] In this example, 100 parts of raw rubber containing carboxyl vinyl acrylate (AEM) was weighed and milled at 60° C. for 10 minutes using an open mill to obtain a plasticized rubber.

[0070] The rubber mill was heated to 70°C, 100 parts of plasticized rubber was added, 50 parts of reinforcing filler (N772 carbon black) were added in two portions, and the mixture was mixed for 5 minutes. 1.5 parts of antioxidant (stearic acid) and 0.5 parts of release agent (Armeen 18D) were added, and the mixture was mixed for 5 minutes. 1 part of release agent (Vanfre VAM) and 0.1 part of scorch retarder (CTP) were added, and the mixture was mixed for 3 minutes. 1 part of antioxidant (Naugard 445) was added, and the mixture was mixed for 3 minutes. 10 parts of distortion improver were added, and the mixture was mixed for 5 minutes. 1.5 parts of vulcanizing agent (Diak NO 1) and 4 parts of accelerator (DOTG) were added, and the mixture was mixed for 20 minutes to obtain a blended rubber compound.

[0071] The blended rubber material was pressed into a sheet using a rubber flat vulcanizer at 70° C. and 0.5 MPa.

[0072] The sheet was pressed into a rubber sound film using a sound film press at 200° C., 0.2 MPa, and 10 min.

[0073] (Example 3)

[0074] In this example, 100 parts of raw rubber containing carboxyl vinyl acrylate (AEM) was weighed and milled at 60° C. for 10 minutes using an open mill to obtain a plasticized rubber.

[0075] The rubber mill was heated to 70°C, 100 parts of plasticized rubber was added, 50 parts of reinforcing filler (N772 carbon black) were added in two portions, and the mixture was mixed for 5 minutes. 1.5 parts of antioxidant (stearic acid) and 0.5 parts of release agent (Armeen 18D) were added, and the mixture was mixed for 5 minutes. 1 part of release agent (Vanfre VAM) and 0.1 part of scorch retarder (CTP) were added, and the mixture was mixed for 3 minutes. 1 part of antioxidant (Naugard 445) was added, and the mixture was mixed for 3 minutes. 15 parts of distortion improver were added, and the mixture was mixed for 5 minutes. 1.5 parts of vulcanizing agent (Diak NO 1) and 4 parts of accelerator (DOTG) were added, and the mixture was mixed for 20 minutes to obtain a blended rubber compound.

[0076] The blended rubber material was pressed into a sheet using a rubber flat vulcanizer at 70° C. and 0.5 MPa.

[0077] The sheet was pressed into a rubber sound film using a sound film press at 200° C., 0.2 MPa, and 10 min.

[0078] The carboxyethylene acrylate (AEM)-containing rubber diaphragms in Example 1, Example 2, and Example 3 were selected and made into loudspeakers, and their distortion (THD) was tested. The results are shown in Figure 2. It can be seen from the results that the loudspeaker using the distortion-improved rubber diaphragm of the present invention can significantly improve the distortion characteristics (THD) of the low-frequency sound device.

[0079] It should be noted that the raw rubber in the examples includes, but is not limited to, one or more of nitrile rubber, hydrogenated nitrile rubber, butyl rubber, styrene-butadiene rubber, natural rubber, chloroprene rubber, EPDM rubber, EPDM dipolymer, butadiene rubber, acrylate rubber, ethylene acrylate rubber, chlorosulfonated polyethylene, silicone rubber, and fluororubber. The examples use carboxyl-containing ethylene acrylate rubber as an example, but are not intended to limit the scope of application of the present invention.

[0080] The rubber sound diaphragm of the present invention can be used in sound-generating devices including but not limited to loudspeakers, receivers and other sound-generating devices. The embodiments are described using loudspeakers as an example, which is not intended to limit the scope of use of the present invention.

[0081] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

[0082] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A rubber diaphragm, characterized in that: The rubber sound film is composed of main rubber, distortion improver, vulcanizer, accelerator, reinforcing filler and other processing aids; Wherein, the distortion improving agent is a substance having a number average molecular weight between 1000 and 1000000, and the structure of the distortion improving agent has special chemical cross-linking points participating in the rubber vulcanization reaction; The added amount of the distortion improving agent accounts for 0.1%-100% of the mass of the main rubber; The content of the special chemical cross-linking points accounts for 0.01%-30% of the mass of the distortion improver; The distortion improving agent improves the distortion in a frequency band of 0.1HZ-20000Hz; The amount of the vulcanizing agent added is 0.001%-10% of the mass of the main rubber; The amount of the accelerator added is 0.1%-10% of the mass of the main rubber; The added amount of the reinforcing filler accounts for 5%-150% of the mass of the main rubber; The addition amount of the other processing aids accounts for 1%-50% of the mass of the main rubber; the other processing aids include one or more of release agents, antioxidants, anti-aging agents, plasticizers, dispersants, anti-scorch agents, dispersing aids and activators.

2. The rubber diaphragm according to claim 1, characterized in that: The special chemical cross-linking points in the distortion improver include one or more of double bonds, triple bonds, isocyanate groups, silyl hydrogen bonds, silyl chloro bonds, azide groups, epoxy groups, nitrile groups, siloxane groups, carboxyl groups, hydroxyl groups, amide groups, amino groups, acyl chloride groups and anhydride groups.

3. The rubber diaphragm according to claim 1, characterized in that: The main rubber includes one or more of nitrile rubber, hydrogenated nitrile rubber, butyl rubber, styrene butadiene rubber, natural rubber, chloroprene rubber, EPDM rubber, EPDM rubber, butadiene rubber, acrylate rubber, ethylene acrylate rubber, chlorosulfonated polyethylene, silicone rubber and fluororubber.

4. The method for preparing a rubber sound membrane according to any one of claims 1 to 3, characterized in that: The preparation method of the rubber sound membrane comprises the following steps: Step S1, plasticating the raw rubber through an open mixer or an internal mixer to obtain a plasticized rubber as the main rubber; Step S2, blending the reinforcing filler, the vulcanizing agent, the accelerator, the distortion improving agent and the other processing aids with the plasticized rubber through a blending device according to the components of the rubber sound film to obtain a blended rubber material; Step S3, forming a film by rolling or hot pressing the blended rubber material through a casting method; Step S4, vulcanizing and molding the diaphragm to form the rubber sound diaphragm.

5. The method for preparing the rubber sound membrane according to claim 4, characterized in that: In the step S2, the blending method includes one or more of solid-solid blending, solid-liquid blending and liquid-liquid blending; the blending equipment includes one or more of a rubber open mixer, a rubber internal mixer and a planetary mixer.

6. The method for preparing the rubber sound membrane according to claim 4, characterized in that: The step S2 includes the following sub-steps: Weigh the components according to the components of the rubber sound film: 100 parts of the plasticizer, 10 parts to 100 parts of the reinforcing filler, 0.3 parts to 15 parts of the other processing aids, 1 part to 100 parts of the distortion improver, 0.1 parts to 10 parts of the vulcanizer, and 0.1 parts to 10 parts of the accelerator; The components are added in sequence at 25° C.-100° C. using the blending equipment. After each addition of one component, the next component is added at an interval of 3 min-10 min. After all components are added, mixing is continued for 3 min-30 min.

7. The method for preparing a rubber sound membrane as claimed in claim 6, wherein in the step of weighing the components according to the components of the rubber sound membrane, the other processing aids are: 0.1 to 5 parts of a release agent, 0.1 to 5 parts of a scorch retarder, and 0.01 to 5 parts of an antioxidant.

8. The method for preparing the rubber sound membrane according to claim 4, characterized in that: In the step S3, the blended rubber material is pressed into the diaphragm by a rubber plate vulcanizer at 25° C.-100° C. and 0.1 MPa-5 MPa.

9. The method for preparing the rubber sound membrane according to claim 4, characterized in that: In the step S4, in which the diaphragm is vulcanized and molded, the molding reaction includes one or more of hot pressing molding, dissolution and coating molding, and injection molding; and the number of vulcanizations includes one or more times.

10. The method for preparing the rubber sound membrane according to claim 9, characterized in that: In the step S4, the diaphragm is pressed into the rubber sound diaphragm by a sound diaphragm press under the conditions of 180-210° C., 0.2 MPa, and 5 min-20 min.

11. A sound-generating device, characterized in that: The sound-generating device comprises the rubber diaphragm as described in any one of claims 1 to 3.

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