Rubber diaphragm, and sound-producing device and use thereof

Abstract

A rubber diaphragm, and a sound-producing device and the use thereof. The rubber diaphragm contains 0.5-50% by mass of a distortion improver. The distortion improver is a random linear polymer in which two or more monomer components are randomly arranged on the main chain structure thereof and all the monomer components are coordinated with each other to regulate the distortion performance. The terminal group, and / or the side group and the side chain of the distortion improver contain 0.01-20% by mass of special chemical reaction cross-linking points. The number-average molecular weight of the distortion improver is 500-1,200,000. The distortion improver or the main chain structure thereof is prepared by means of a one-step method. The rubber diaphragm comprises the distortion improver, which is a linear high-molecular polymer in which all the components are randomly arranged. A sound-producing device in which the rubber diaphragm is used has significantly reduced low-frequency distortion (THD) while good frequency response characteristics thereof are maintained. The distortion improver is simple to prepare, has a low cost, and is widely applicable.

Description

A rubber sound membrane and sound-generating device and their applications

Technical field

[0001] The present application relates to the field of new material technology, and in particular to a rubber diaphragm and a sound-generating device and their applications. [Background Technology]

[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.

[0003] Due to its unique physical properties, rubber diaphragms are gaining popularity in high-end sound-generating devices. Improving the performance of rubber diaphragms and reducing the THD of sound-generating devices is gaining increasing attention.

[0004] Therefore, there is an urgent need in this field for a rubber diaphragm, so that the sound-generating device equipped with the rubber diaphragm can not only maintain the basic performance of the sound-generating device, but also significantly reduce the distortion in the low-frequency band, effectively improve the acoustic quality of the sound-generating device while having low production costs.

[0005] [Summary of the invention]

[0006] The purpose of this application is to provide a rubber sound membrane and a sound-generating device and their applications, wherein the rubber sound membrane includes a distortion improver, which can significantly improve the distortion characteristics of the low-frequency sound-generating device. At the same time, its preparation method is simple, the production cost is low and it has great application value.

[0007] The technical solution of this application is as follows:

[0008] In the first aspect, the present application provides a rubber sound membrane, which contains a distortion improver with a mass percentage of 0.5-50%; the distortion improver is a random linear polymer with two or more monomer components randomly arranged on the main chain structure and the distortion performance is synergistically regulated between the monomer components; the end groups, and / or side groups and side chains of the distortion improver contain special chemical reaction cross-linking points with a mass percentage of 0.01-20%, and the number average molecular weight of the distortion improver is 500-1200000; the distortion improver or its main chain structure is prepared by a one-step method.

[0009] Preferably, the main chain structure of the distortion improver is a linear structure; the main chain structure carries one or more side groups or side chains, and the side chains include one or more short side chains or long side chains.

[0010] Preferably, the special chemical reaction crosslinking points include one or more of a double bond, a triple bond, an epoxy group, a nitrile group, a siloxane group, a carboxyl group, a hydroxyl group, an amide group, an amino group, an acyl chloride group, an isocyanate group, a silicon hydrogen bond, a silicon chlorine bond, an azide group or an acid anhydride group.

[0011] Preferably, the random linear polymer can be prepared by free radical polymerization, anionic polymerization, cationic polymerization or condensation polymerization.

[0012] Preferably, the rubber sound membrane further includes a main body rubber, a reinforcing filler, a vulcanizing agent, a vulcanizing aid, an antioxidant and a release agent.

[0013] Preferably, the preparation of the distortion improving agent specifically comprises the steps of:

[0014] The invention relates to a method for preparing an emulsion by mixing 100 parts of styrene, 25-30 parts of butadiene, 0.5-1 part of a crosslinking agent, 300 parts of water, and 5-10 parts of an emulsifier, and adding 0.1-0.3 parts of an initiator, 0.1-0.3 parts of a polymerization terminator, and 5-8 parts of a polymerization regulator. The mixture is passed through nitrogen for 20-30 minutes. The mixture is reacted at 10°C for 1-5 hours under ventilation and reflux condensation conditions, and the solvent is removed to obtain the distortion improving agent.

[0015] In a second aspect, the present application provides a sound-generating device, which includes a voice coil, a magnetic circuit system, a supporting structure, and the rubber diaphragm as described above.

[0016] In a third aspect, the present application provides an application of the sound-generating device as described above in a terminal product.

[0017] The beneficial effects of this application are:

[0018] The present application provides a rubber sound membrane, which includes the distortion improver. The distortion improver is a type of linear high molecular polymer with randomly arranged components. Applying the rubber sound membrane described in the present application to a sound-generating device can significantly reduce the distortion characteristics of the sound-generating device and maintain the original performance of the sound-generating device. The distortion improver is inexpensive and does not increase the overall production cost of the rubber sound membrane and the sound-generating device.

Brief Description of the Drawings

[0019] FIG1 is a THD curve diagram of a rubber sound membrane obtained in an embodiment of the present invention and a rubber sound membrane in the prior art when applied to a sound-generating device. [Specific implementation method]

[0020] The present application will be further described below with reference to the accompanying drawings and implementation methods.

[0021] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0022] In the first aspect, the present application provides a rubber sound membrane, which contains a distortion improver with a mass percentage of 0.5-50%; the distortion improver is a random linear polymer with two or more monomer components randomly arranged on the main chain structure and the distortion performance is synergistically regulated between the monomer components; the end groups, and / or side groups and side chains of the distortion improver contain special chemical reaction cross-linking points with a mass percentage of 0.01-20%, and the number average molecular weight of the distortion improver is 500-1200000; the distortion improver or its main chain structure is prepared by a one-step method, that is, the monomers are directly mixed, and the distortion improver or the distortion improver main chain structure is prepared in one step.

[0023] The rubber sound membrane described in the present application contains a distortion improver, and the distortion improver is a random linear polymer with two or more monomer components randomly arranged on the main chain structure; polymers synthesized from different monomers have different damping temperature ranges, and the rubber sound membrane is applied to a sound-generating device, which significantly reduces the distortion characteristics of the sound-generating device while not affecting other performances of the sound-generating device; at the same time, the raw materials of the distortion improver are cheap, and the production cost will not increase the overall production cost of the sound-generating device and the end product. When using a sound-generating device containing a rubber sound membrane containing a distortion improver in the present application, the THD of the sound-generating device in the low-frequency band is significantly reduced, and the sound quality is improved, while having almost no effect on F0 and frequency response. Sound-generating devices have been used in mobile phones, headphones, tablets, computers, cars, televisions, audio equipment and other fields.

[0024] Preferably, the main chain structure of the distortion improver is a linear structure; the main chain structure carries one or more of the side groups or side chains, and the side chains include one or more of short branches or long branches; preferably, the main chain structure carries 1-5 side groups.

[0025] Preferably, the special chemical reaction crosslinking points include one or more of a double bond, a triple bond, an epoxy group, a nitrile group, a siloxane group, a carboxyl group, a hydroxyl group, an amide group, an amino group, an acyl chloride group, an isocyanate group, a silicon hydrogen bond, a silicon chlorine bond, an azide group or an acid anhydride group.

[0026] Preferably, the random linear polymer can be prepared by free radical polymerization, anionic polymerization, cationic polymerization or condensation polymerization.

[0027] Preferably, the rubber sound membrane further includes a main body rubber, a reinforcing filler, a vulcanizing agent, a vulcanizing aid, an antioxidant and a release agent.

[0028] In some embodiments, the rubber sound membrane includes, by mass, 100 parts of ethylene acrylate elastic monomer Vamac G, 2 parts of antioxidant Naugard 445, 1.5 parts of release agent Armeen 18D, 1.5 parts of release agent Vanfre VAM, 1.5 parts of stearic acid Stearic Acid, 50 parts of AEM rubber Spheron SOA SO N-550, 1.5 parts of vulcanizing agent DIAK NO.1, 2 parts of vulcanizing aid Vulcofac ACT55, and 10 parts of the distortion improver.

[0029] Preferably, the preparation of the distortion improving agent specifically comprises the steps of:

[0030] The invention relates to a method for preparing an emulsion by mixing 100 parts of styrene, 25-30 parts of butadiene, 0.5-1 part of a crosslinking agent, 300 parts of water, and 5-10 parts of an emulsifier. The mixture is mixed to form an emulsion using an emulsifier, and 0.1-0.3 parts of an initiator, 0.1-0.3 parts of a polymerization terminator, and 5-8 parts of a polymerization regulator are added. The mixture is passed through nitrogen for 20-30 minutes. The mixture is reacted at a temperature of 10°C for 1-5 hours under ventilation and reflux condensation conditions, and the solvent is removed to obtain the distortion improver.

[0031] The present application provides a sound-generating device, which includes the rubber diaphragm, voice coil, magnetic circuit system and supporting structure as described above.

[0032] In a third aspect, the present application provides an application of the above-mentioned sound-generating device in a terminal product. Specifically, the terminal product includes a mobile phone, a smart watch, a computer, a speaker, a television, and a car.

[0033] Example 1: Preparation of a distortion improving agent, comprising the steps of:

[0034] 100 parts of styrene, 25 parts of butadiene, 0.5 parts of hydroxyethyl acrylate, 300 parts of water, and 5 parts of emulsifier DNS-86 were weighed by mass and prepared into an emulsion using an emulsifier. 0.1 parts of tert-butyl hydroperoxide, 0.1 parts of ascorbic acid, and 5 parts of tert-dodecyl mercaptan were added and aerated with nitrogen for 20 minutes. The mixture was reacted at 10°C under ventilation and reflux condensation conditions for 1-5 hours. The solvent was removed to obtain the desired distortion improver, designated as distortion improver 1. Hydroxyethyl acrylate is the crosslinking agent, tert-butyl hydroperoxide is the initiator, ascorbic acid is the polymerization terminator, and tert-dodecyl mercaptan is the polymerization regulator.

[0035] Example 2: Preparation of a distortion improving agent, comprising the steps of:

[0036] 100 parts of styrene, 30 parts of butadiene, 0.5 parts of hydroxyethyl acrylate, 300 parts of water, and 5 parts of emulsifier DNS-86 were weighed by mass and prepared into an emulsion using an emulsifier. 0.1 parts of tert-butyl hydroperoxide, 0.1 parts of ascorbic acid, and 5 parts of tert-dodecyl mercaptan were added and nitrogen was purged for 20 minutes. The mixture was reacted at 10°C under ventilation and reflux condensation conditions for 1-5 hours. The solvent was removed to obtain the desired distortion improver, designated as distortion improver 2. Hydroxyethyl acrylate is the crosslinking agent, tert-butyl hydroperoxide is the initiator, ascorbic acid is the polymerization terminator, and tert-dodecyl mercaptan is the polymerization regulator.

[0037] Example 3: Preparation of a distortion improving agent, comprising the steps of:

[0038] 100 parts of styrene, 28 parts of butadiene, 0.5 parts of hydroxyethyl acrylate, 300 parts of water, and 5 parts of emulsifier DNS-86 were weighed by mass and prepared into an emulsion using an emulsifier. 0.1 parts of tert-butyl hydroperoxide, 0.1 parts of ascorbic acid, and 5 parts of tert-dodecyl mercaptan were added and aerated with nitrogen for 20 minutes. The mixture was reacted at 10°C under ventilation and reflux condensation conditions for 1-5 hours. The solvent was removed to obtain the desired distortion improver, designated as distortion improver 3. Hydroxyethyl acrylate is the crosslinking agent, tert-butyl hydroperoxide is the initiator, ascorbic acid is the polymerization terminator, and tert-dodecyl mercaptan is the polymerization regulator.

[0039] Example 4: Using carboxyl-containing AEM rubber as an example, the effect of the distortion-improving agent described in this application on the rubber sound diaphragm described in this application is illustrated. It should be understood that the examples of this application are intended to better illustrate the patent, not to limit its scope of application.

[0040] The specific operation includes the steps of: mixing the distortion improvers 1, 2 and 3 obtained in Examples 1-3 with other raw materials to obtain rubber compounds containing the distortion improvers 1, 2 and 3, respectively. The rubber formula is shown in Table 1 below; preferably, in parts by mass, the raw materials selected in the rubber formula of the embodiment of the present application include the rubber sound film including ethylene acrylate elastic monomer Vamac G, antioxidant Naugard 445, release agent Armeen 18D, release agent Vanfre VAM, stearic acid Stearic Acid, AEM rubber Spheron SOA SO N-550, vulcanizing agent DIAK NO.1, vulcanizing aid Vulcofac ACT55, and the distortion improvers obtained in Examples 1-3.

[0041] Table 1. Rubber formula

[0042] The mixed rubber was then pressed or coated into a thin sheet approximately 100 microns using a rubber calender, flat vulcanizer, or coater. The rubber diaphragm was then pressed using a diaphragm press at 200°C, 0.2 MPa, for 10 minutes. The diaphragm was then assembled into a loudspeaker. The distortion (THD) performance of speakers containing distortion improvers 1, 2, and 3, as well as a conventional rubber diaphragm, was tested, using a conventional rubber diaphragm as a control. The test results are shown in Figure 1.

[0043] As shown in Figure 1, a sound-generating device equipped with a rubber diaphragm containing a distortion-reducing agent as described herein significantly reduces THD at low frequencies, improving sound quality while maintaining virtually no effect on F0 and frequency response. These sound-generating devices are already used in mobile phones, headphones, tablets, computers, automobiles, televisions, and stereos.

[0044] The above is only an implementation method of the present application. It should be pointed out that for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present application, but these all fall within the scope of protection of the present application.

Claims

1. A rubber sound film, characterized in that: The rubber voice coil membrane contains a distortion improver in an amount of 0.5-50% by mass; the distortion improver is a random linear polymer with two or more monomer components randomly arranged in the main chain structure, and the distortion performance is synergistically regulated among the monomer components; the end groups, and / or side groups and side chains of the distortion improver contain special chemical reaction crosslinking points in an amount of 0.01-20% by mass, and the number average molecular weight of the distortion improver is 500-1,200,000; the distortion improver or its main chain structure is prepared by a one-step method.

2. The rubber sound film according to claim 1, wherein: The main chain structure of the distortion improver is a linear structure; one or more of the side groups or side chains are attached to the main chain structure, and the side chains include one or more of short branched chains or long branched chains.

3. The rubber sound film according to claim 1, wherein: The special chemical reaction crosslinking points include one or more of double bonds, triple bonds, epoxy groups, nitrile groups, siloxanes, carboxyl groups, hydroxyl groups, amide groups, amino groups, acyl chlorides, isocyanate groups, silicon-hydrogen bonds, silicon-chlorine bonds, azide groups or anhydride groups.

4. The rubber sound film according to claim 1, characterized in that: The random linear polymer can be prepared by one of free radical polymerization, anionic polymerization, cationic polymerization or condensation polymerization.

5. The rubber diaphragm according to claim 1, wherein: The rubber voice coil membrane further includes a main body rubber, a reinforcing filler, a vulcanizing agent, a vulcanization aid, an antioxidant and a demolding agent.

6. The rubber sound film according to claim 1, wherein: The preparation of the distortion improver specifically includes the steps: Weigh 100 parts of styrene, 25-30 parts of butadiene, 0.5-1 part of a crosslinking agent, 300 parts of water, and 5-10 parts of an emulsifier by mass; prepare an emulsion after mixing, add 0.1-0.3 parts of an initiator, 0.1-0.3 parts of a polymerization terminator, 5-8 parts of a polymerization regulator, and purge with nitrogen for 20-30 min; react at 10 °C for 1-5 h under the conditions of purging and reflux condensation, and remove the solvent to obtain the distortion improver.

7. A sound generating device, characterized in that: It includes a voice coil, a magnetic circuit system, a support structure, and the rubber voice coil membrane according to any one of claims 1-6.

8. An application of the sound generating device according to claim 7 in a terminal product.

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