CN109054059B - Preparation method of vibrating diaphragm and vibrating diaphragm - Google Patents

Preparation method of vibrating diaphragm and vibrating diaphragm Download PDF

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Publication number
CN109054059B
CN109054059B CN201810581033.8A CN201810581033A CN109054059B CN 109054059 B CN109054059 B CN 109054059B CN 201810581033 A CN201810581033 A CN 201810581033A CN 109054059 B CN109054059 B CN 109054059B
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silica gel
mica material
liquid silica
coupling agent
diaphragm
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CN109054059A (en
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周厚强
宋启龙
娄立杭
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Goertek Inc
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Goertek Inc
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

The invention discloses a preparation method of a vibrating diaphragm and the vibrating diaphragm. The preparation method comprises the following steps; adding a mica material into the liquid silica gel, and uniformly mixing; and carrying out cross-linking molding on the mixed materials to form the vibrating diaphragm. Through mica material to liquid silica gel modify, can show damping performance and the elastic modulus that improves the vibrating diaphragm, can show the segmentation vibration that reduces the vibrating diaphragm, can absorb the noise to improve sound making performance of sound generating mechanism, can adjust the F of vibrating diaphragm0(resonant frequency), reduce the nonlinear distortion of vibrating diaphragm, reduce the emergence of vibrating diaphragm rupture of membranes phenomenon.

Description

Preparation method of vibrating diaphragm and vibrating diaphragm
Technical Field
The invention relates to the technical field of electroacoustic conversion, in particular to a diaphragm and a preparation method thereof.
Background
The silicon rubber is composed of silicon-oxygen bonds, has the characteristics of higher bond energy, long bond length and high chemical stability, and has good temperature resistance and forming performance. The silicon rubber diaphragm is formed by cross-linking liquid silicon rubber after injection molding or die pressing. The silicon rubber diaphragm is a thermosetting material, has high temperature resistance, good thickness uniformity of the diaphragm and acoustic performance.
However, the existing silicon rubber diaphragm has poor damping performance and poor noise absorption effect, and cannot meet the requirements of users on high damping and high sound-listening performance of sounding products.
Disclosure of Invention
The invention aims to provide a new technical scheme of a preparation method of a vibrating diaphragm.
According to a first aspect of the present invention, a method for preparing a diaphragm is provided. The preparation method comprises the following steps; adding a mica material into the liquid silica gel, and uniformly mixing; and carrying out cross-linking molding on the mixed materials to form the vibrating diaphragm.
Optionally, the mica material includes at least one of biotite, phlogopite, muscovite, lepidolite, sericite, biotite, and lepidolite.
Optionally, the mica material has a particle size of 30 mesh to 8000 mesh.
Optionally, the ratio of the mica material to the liquid silica gel in parts by mass is: 0.1:100-50:100.
Optionally, adding the mica material to the liquid silica gel and mixing uniformly comprises: adding the mica material of which the surface is modified by the coupling agent into the liquid silica gel, and uniformly mixing.
Optionally, the adding the mica material of which the surface is modified by the coupling agent into the liquid silica gel, and uniformly mixing comprises: mixing the coupling agent with the mica material to perform modification treatment on the surface of the mica material; and adding the modified mica material into the liquid silica gel, and uniformly mixing.
Optionally, the adding the mica material of which the surface is modified by the coupling agent into the liquid silica gel, and uniformly mixing comprises: adding the mica material and the coupling agent into the liquid silica gel together, and uniformly mixing.
Optionally, the ratio of the coupling agent to the liquid silica gel in parts by mass is: 0.1:100-5:100.
Optionally, the coupling agent comprises at least one of a silane coupling agent, a titanate coupling agent, and an organochromium complex coupling agent.
According to another aspect of the present invention, a diaphragm is provided. The diaphragm is prepared according to the preparation method provided by the invention; or
The diaphragm is formed by compounding multiple layers of materials, wherein the preparation method of at least one film layer comprises the following steps:
adding a mica material into the liquid silica gel, and uniformly mixing;
and carrying out cross-linking molding on the mixed materials to form the film layer.
According to one embodiment of the disclosure, the liquid silica gel is modified by the mica material, so that the damping performance and the elastic modulus of the diaphragm can be obviously improved.
In addition, the mica material is used for modifying the liquid silica gel, so that the segmentation vibration of the vibrating diaphragm can be obviously reduced.
In addition, the damping performance of the diaphragm is improved, so that noise can be absorbed, and the listening performance of the sound production device is improved.
In addition, since the elastic modulus of the diaphragm is increased, F of the diaphragm can be adjusted0(resonant frequency), reduce the nonlinear distortion of vibrating diaphragm, reduce the emergence of vibrating diaphragm rupture of membranes phenomenon.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flowchart of a method of manufacturing a diaphragm according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a flowchart of a method of manufacturing a diaphragm according to an embodiment of the present invention.
As shown in fig. 1, the preparation method comprises;
and S1, adding the mica material into the liquid silica gel, and uniformly mixing.
Specifically, the mica material is aluminosilicate of metal such as potassium, aluminum, magnesium, iron, lithium, etc. Typically a layered structure, monoclinic. The crystals of the mica material are in the shape of pseudo-hexagonal platelets or plates. Liquid silica gel is a commonly used material in the art. The liquid silica gel is a thermosetting material and is in a liquid state at normal temperature and normal pressure, and the curing of the liquid silica gel can be accelerated by heating.
Preferably, the liquid silica gel to which the mica material is added is mixed using a kneader or a mixer so that the mica material is uniformly dispersed in the liquid silica gel. The mica material and the liquid silica gel are mixed more uniformly and consistently in the mixing mode.
And S2, performing cross-linking molding on the mixed materials to form the diaphragm.
Specifically, the material is injected into the mold by injection molding. The material is gradually solidified, and a vibrating diaphragm with a set structure is formed. Crosslinking refers to the formation of a bridge structure of the polymer strands by adding a crosslinking agent to the liquid silicone gel, ultimately producing an elastomer. The crosslinking agent may be a vulcanizing agent or a non-vulcanizing agent.
Specifically, in the mode through compression molding added the material mould, through pressurization, heating mode, the material is fixed gradually to form the vibrating diaphragm that has the settlement structure.
Of course, those skilled in the art can select the forming method according to actual needs, and the forming method is not limited herein. Such as casting, printing, etc.
In the embodiment of the invention, the liquid silica gel is modified by the mica material, so that the damping performance and the elastic modulus of the diaphragm can be obviously improved.
In addition, the mica material is used for modifying the liquid silica gel, so that the segmentation vibration of the vibrating diaphragm can be obviously reduced.
In addition, the damping performance of the diaphragm is improved, so that noise can be absorbed, and the listening performance of the sound production device is improved.
In addition, since the elastic modulus of the diaphragm is increased, F of the diaphragm can be adjusted0(resonant frequency), reduce the nonlinear distortion of vibrating diaphragm, reduce the emergence of vibrating diaphragm rupture of membranes phenomenon.
In one example, the mica material includes at least one of biotite, phlogopite, muscovite, lepidolite, sericite, biotite, and lepidolite. The mica material has wide sources, and can improve the damping performance and the elastic modulus of the vibrating diaphragm. The kind of mica material added can be selected by those skilled in the art according to the actual needs.
In one example, the mica material has a particle size of 30 mesh to 8000 mesh. The particle size is the mesh size of the screen through which the particles can pass. The mesh refers to the mesh count of a 1 inch (about 25.4mm) length. The larger the mesh number is, the finer the material degree of the material cloud base material is; the smaller the mesh size, the larger the particle size of the mica material. Mica materials in this size range can be mixed homogeneously with liquid silica gel and can bond well with liquid silica gel.
The higher the mass fraction of the mica material, the better the damping performance of the diaphragm after molding, but the lower the hardness will be. Preferably, the mass part ratio of the mica material to the liquid silica gel is: 0.1:100-50:100. Within this ratio range, the molded diaphragm has higher damping performance and elastic modulus, while the diaphragm has sufficient hardness. Wherein the hardness of the prepared diaphragm is 10A-90A. This hardness range enables good conformality of the diaphragm. In the repeated use process, the vibrating diaphragm is not easy to generate fatigue damage.
Can be adjusted by one skilled in the artF of vibrating diaphragm is adjusted to festival mica material's addition volume0(resonance frequency), the split vibration of the diaphragm is reduced, distortion is reduced, and thus optimal acoustic performance is achieved.
In one example, adding a mica material to a liquid silica gel and mixing uniformly comprises: adding the mica material of which the surface is modified by the coupling agent into the liquid silica gel, and uniformly mixing.
The coupling agent has a hydrophilic silica gel group and a hydrophilic mica material group, so that the binding force of the liquid silica gel and the mica material is higher, and the liquid silica gel and the mica material can be better compatible. The compatibility is improved, so that the comprehensive properties such as damping property, elastic modulus and the like of the formed diaphragm can be improved.
In one example, adding a mica material, the surface of which is modified with a coupling agent, to a liquid silica gel and mixing uniformly comprises:
the mica material and the coupling agent are added together to the liquid silica gel and mixed evenly.
The addition mode can improve the compatibility of the mica material and the liquid silica gel, and the operation is easy.
In one example, adding a mica material, the surface of which is modified with a coupling agent, to a liquid silica gel and mixing uniformly comprises:
mixing a coupling agent with a mica material to modify the surface of the mica material;
and adding the modified mica material into the liquid silica gel, and uniformly mixing.
Through the modification treatment, the mica-philic material group of the coupling agent can be more effectively combined with the mica material. The mica material and the coupling agent are added together to the silica gel. The hydrophilic silicone base of the coupling agent will bond with the silicone gum.
Compared with the method of directly adding the coupling agent and the mica material into the liquid silica gel, the method enables the coupling agent and the mica material to be combined more fully, so that the binding force between the mica material and the liquid silica gel is stronger and the compatibility is better.
In one example, the coupling agent includes at least one of a silane coupling agent, a titanate coupling agent, and an organochromium complex coupling agent. The materials have wide sources and good coupling effect. One skilled in the art can select and add any one of the above coupling agents, or can select and add a mixture of a plurality of the above coupling agents.
The general formula of the silane coupling agent is RSiX3, wherein R represents amino, sulfydryl, vinyl, epoxy, cyano, methacryloxy and other groups, and the groups and different liquid silica gels have strong reaction capability. Si represents a silicon atom. X represents an alkoxy group capable of hydrolysis (e.g., methoxy, ethoxy, etc.). The coupling agent has good coupling effect when being used in liquid silica gel.
Titanate coupling agents include monoalkoxy type, monoalkoxy pyrophosphate type, chelate type, and ligand type, and the like. The coupling agent has good coupling effect when being used in liquid silica gel.
The organic chromium complex coupling agent is a metal chromium complex formed by unsaturated organic acid and trivalent chromium ions. The coupling agent has good coupling effect when being used in liquid silica gel.
The kind, amount and the like of the coupling agent can be selected by those skilled in the art according to actual needs.
In one example, the ratio of the coupling agent to the liquid silica gel in parts by mass is: 0.1:100-5:100. In the proportion range, the formed diaphragm has higher hardness and damping performance, and meanwhile, the toughness of the diaphragm cannot be adversely affected.
The kind and amount of coupling agent, mica material can be selected by those skilled in the art according to the actual needs.
In other examples, in order to improve the overall performance of the diaphragm, an auxiliary agent such as a plasticizer, a compatibilizer, a heat stabilizer, a light stabilizer, a lubricant, and a flame retardant may be added during mixing. The person skilled in the art can select the auxiliaries customary in the art and the amounts used according to the actual requirements.
According to another embodiment of the present invention, a diaphragm is provided. The diaphragm is of a single-layer film structure and is prepared according to the preparation method of the invention.
The diaphragm has the characteristics of excellent damping performance and high elastic modulus.
The diaphragm can also be formed by compounding multiple layers of materials, wherein the preparation method of at least one film layer comprises the following steps:
adding a mica material into the liquid silica gel, and uniformly mixing;
and carrying out cross-linking molding on the mixed materials to form a film layer.
The types of liquid silica gel and mica materials, the mixing manner, and the like are as disclosed in the above examples. Preferably, the step of adding the mica material to the liquid silica gel and mixing uniformly comprises: the surface of the mica material is modified by adopting a coupling agent so as to improve the compatibility of the mica material.
The coupling agent has a hydrophilic silica gel group and a hydrophilic mica material group, so that the binding force of the liquid silica gel and the mica material is higher, and the liquid silica gel and the mica material can be better compatible. The compatibility is improved, so that the comprehensive performances of the formed diaphragm such as hardness, damping performance and the like can be improved.
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 illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (9)

1. A preparation method of a diaphragm is characterized by comprising the following steps of;
adding a mica material into liquid silica gel, and uniformly mixing, wherein the liquid silica gel is a thermosetting material, and the mass parts of the mica material and the liquid silica gel are as follows: 0.1:100-50: 100;
and carrying out cross-linking molding on the mixed materials to form the vibrating diaphragm.
2. The method for preparing a diaphragm according to claim 1, wherein the mica material includes at least one of biotite, phlogopite, muscovite, lepidolite, sericite, biotite, and lepidolite.
3. The method for preparing a diaphragm according to claim 1, wherein the mica material has a particle size of 30-8000 meshes.
4. The method for preparing a diaphragm according to any one of claims 1 to 3, wherein the adding mica material to the liquid silica gel and mixing uniformly comprises:
adding the mica material of which the surface is modified by the coupling agent into the liquid silica gel, and uniformly mixing.
5. The method for preparing a diaphragm according to claim 4, wherein the step of adding the mica material of which the surface is modified by the coupling agent into the liquid silica gel and uniformly mixing comprises:
mixing the coupling agent with the mica material to perform modification treatment on the surface of the mica material;
and adding the modified mica material into the liquid silica gel, and uniformly mixing.
6. The method for preparing a diaphragm according to claim 4, wherein the step of adding the mica material of which the surface is modified by the coupling agent into the liquid silica gel and uniformly mixing comprises:
adding the mica material and the coupling agent into the liquid silica gel together, and uniformly mixing.
7. The preparation method of the diaphragm according to claim 4, wherein the ratio of the coupling agent to the liquid silica gel in parts by mass is: 0.1:100-5:100.
8. The method for preparing a diaphragm according to claim 4, wherein the coupling agent includes at least one of a silane coupling agent, a titanate coupling agent, and an organochromium complex coupling agent.
9. A diaphragm characterized by being prepared by the preparation method according to any one of claims 1 to 8; or
The diaphragm is formed by compounding multiple layers of materials, wherein the preparation method of at least one film layer comprises the following steps:
adding a mica material into the liquid silica gel, and uniformly mixing;
and carrying out cross-linking molding on the mixed materials to form the film layer.
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CN110784817B (en) * 2019-10-16 2021-04-02 深圳创维－Rgb电子有限公司 Preparation method of loudspeaker diaphragm, loudspeaker diaphragm and loudspeaker monomer
CN114827871B (en) * 2021-01-29 2023-07-14 歌尔股份有限公司 Vibrating diaphragm and sound producing device
CN113773534B (en) * 2021-08-31 2023-08-04 歌尔股份有限公司 Vibrating diaphragm of sound production device and sound production device thereof

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CN104761935A (en) * 2015-03-20 2015-07-08 英德市雅家涂料有限公司 Antimicrobial non-viscous aqueous inorganic nano coating priming paint and preparation method thereof
CN107418211A (en) * 2017-06-20 2017-12-01 安徽燕青科技集团有限公司 A kind of LED indoor radiating silica gel sheet

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TWI386451B (en) * 2009-05-12 2013-02-21 Nanya Plastics Corp Pvc composite and its product

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Publication number Priority date Publication date Assignee Title
CN104761935A (en) * 2015-03-20 2015-07-08 英德市雅家涂料有限公司 Antimicrobial non-viscous aqueous inorganic nano coating priming paint and preparation method thereof
CN107418211A (en) * 2017-06-20 2017-12-01 安徽燕青科技集团有限公司 A kind of LED indoor radiating silica gel sheet

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