WO2021128192A1

WO2021128192A1 - Carbon fiber dome, preparation method therefor, and loudspeaker

Info

Publication number: WO2021128192A1
Application number: PCT/CN2019/128813
Authority: WO
Inventors: 狄勋; 赵彬
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-07-01

Abstract

The present application relates to the technical field of electroacoustic devices, and in particular to a carbon fiber dome, a preparation method therefor and a loudspeaker. The carbon fiber dome comprises one or more layers of carbon fiber prepregs, which comprise a carbon fiber material, a resin and a reinforcing material dispersed in the resin. According to the carbon fiber dome, the preparation method therefor, and the loudspeaker of the present application, the reinforcing material is added to the resin in the carbon fiber prepreg, such that the modulus of the resin is improved, the modulus of the carbon fiber prepreg and the modulus of the carbon fiber dome are further improved, and same is beneficial for improving the high-frequency performance of a loudspeaker product.

Description

Carbon fiber dome, its preparation method and loudspeaker

【Technical Field】

This application relates to the technical field of electro-acoustic devices, in particular to a carbon fiber dome, a preparation method thereof, and a speaker.

【Background technique】

Dome-shaped speaker refers to a speaker that uses a dome-shaped diaphragm to directly radiate sound waves. It is a dynamic speaker. The diaphragm is a hemispherical diaphragm. The diaphragm is directly supported by the voice coil without a centering support. Good high frequency response, wide directivity and low distortion.

The carbon fiber dome in the prior art generally uses hot-pressed carbon fiber materials. Compared with pure carbon fiber materials, the modulus of the hot-pressed dome material is greatly reduced, which is not conducive to the improvement of the high-frequency performance of speaker products.

Therefore, it is necessary to provide a new technical solution to solve the above technical problems.

[Summary of the invention]

The present application provides a carbon fiber dome, a preparation method thereof, and a speaker, which can solve the problems of low modulus of the carbon fiber dome in the prior art and difficulty in improving the high frequency performance of the product.

The technical solution of the present application is as follows: a carbon fiber dome is provided, which includes one or more layers of carbon fiber prepregs, the carbon fiber prepregs including carbon fiber materials, resin, and reinforcing materials dispersed in the resin.

Preferably, the carbon fiber dome also includes a foamed material layer, and the one or more layers of carbon fiber prepregs are provided on the upper surface and/or the lower surface of the foamed material layer.

Preferably, the reinforcing material includes one or more of carbon nanotubes, graphene, or silica ceramic particles.

Preferably, the mass fraction of the reinforcing material in the resin containing the reinforcing material is 1%-30%.

Preferably, the mass fraction of resin in the carbon fiber prepreg is 10% to 55%.

Preferably, the mass fraction of resin in the carbon fiber prepreg is 10% to 35%.

Preferably, the one or more layers of carbon fiber prepregs include one or more of carbon fiber unidirectional tape prepregs, carbon fiber woven cloth prepregs, or carbon fiber felt prepregs.

Preferably, the fiber angle between two adjacent layers of carbon fiber prepreg in the multilayer carbon fiber prepreg ranges from 0° to 90°;

And/or, the thickness of the carbon fiber dome is 20 μm to 6000 μm. .

Another technical solution of the present application is as follows: a method for preparing a carbon fiber dome is provided, including:

Contact the reinforcing material with the resin to form a reinforced resin;

Pre-impregnating carbon fiber material with the reinforced resin to obtain a pre-impregnated carbon fiber material;

A layer of the prepreg carbon fiber material is cured; or, multiple layers of the prepreg carbon fiber material are sequentially laminated and then cured; or, on the upper surface and/or under the foamed material layer One or more layers of the pre-impregnated carbon fiber material are pasted on the surface and then cured.

Another technical solution of the present application is as follows: A speaker is provided, which uses the above-mentioned carbon fiber dome.

The beneficial effects of the present application are: the carbon fiber dome, its preparation method, and the speaker of the present application increase the modulus of the resin by adding reinforcing materials to the resin of the carbon fiber prepreg, thereby increasing the carbon fiber prepreg and the carbon fiber dome. The modulus is beneficial to improve the high-frequency performance of speaker products.

【Explanation of the drawings】

FIG. 1 is a schematic diagram of the structure of the carbon fiber dome provided in Embodiment 1 of the application;

2 is a schematic diagram of the structure of the carbon fiber dome provided in Embodiment 2 of the application;

3 is a flowchart of a method for preparing a carbon fiber dome provided in Example 3 of this application;

FIG. 4 is a flowchart of a method for preparing a carbon fiber dome provided in Example 4 of the application.

【Detailed ways】

The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The terms "first", "second", and "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first”, “second”, and “third” may explicitly or implicitly include at least one of the features. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined. All directional indicators (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative positional relationship between the components in a specific posture (as shown in the drawings) , Movement status, etc., if the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions.

The reference to "embodiments" herein means that a specific feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art clearly and implicitly understand that the embodiments described herein can be combined with other embodiments.

Example 1

1 is a schematic diagram of the structure of the carbon fiber dome of Example 1 of the present application. As shown in FIG. 1, the carbon fiber dome 100 includes a carbon fiber layer 110, and the carbon fiber layer 110 includes one or more layers of carbon fiber material prepreg. The prepreg includes a carbon fiber material, a resin, and a reinforcing material dispersed in the resin.

In this embodiment, in order to improve the flexural modulus of the carbon fiber dome 100, the resin of the carbon fiber prepreg is reinforced so that the reinforcing material is in contact with the resin, and the reinforcing material is uniformly dispersed in the resin to form an uncured resin. The carbon fiber material is then pre-impregnated with the resin to form the carbon fiber material prepreg. For example, the uncured resin is impregnated or sprayed on the carbon fiber material, and then the carbon fiber material is cured by the high temperature and high pressure treatment. Carbon fiber impregnated material.

In this embodiment, the reinforcing material may include one or more of carbon nanotubes, graphene, or silica ceramic particles.

When the carbon nanotube is used as a reinforcing material, the carbon nanotube may be a standard product that does not carry a functional group; it may also be a functionalized carbon nanotube that has been treated, for example, after an acid treatment; the carbon nanotube may also have a functional group, the The functional group can be a carboxyl group, a hydroxyl group or an amino group. The carbon nanotubes can be obtained from suppliers known in the art or prepared by known methods.

When the graphene is used as a reinforcing material, it can have any shape. The graphene can be made into graphene rods, graphene blocks, graphene sheets or graphene disks, etc.; the graphene can also be multilayered, or the graphite Alkenes may also carry functional groups, for example, carboxyl, hydroxyl, or amino. The graphene can be obtained from a supplier known in the art or prepared by a known method.

When the silica ceramic particles are used as a reinforcing material, the particle size is preferably nano-scale, for example, the particle size is less than 100 nm.

In this embodiment, the addition of reinforcing materials such as carbon nanotubes, graphene, or silica ceramic particles realizes the improvement of the mechanical properties of the resin. The modulus of the resin containing the reinforcing material is higher than that of the resin without the reinforcing material. The improvements, especially the improved resin flexural modulus, increase the overall flexural modulus of the carbon fiber dome, thereby improving the high-frequency performance of the speaker product using the carbon fiber dome.

It can be understood that, in addition to the aforementioned reinforcing materials such as carbon nanotubes, graphene, or silica ceramic particles, the carbon fiber prepreg in the carbon fiber dome of the present embodiment may also include other reinforcing materials.

In an optional embodiment, after the reinforcing material is added, the mass fraction of the reinforcing material in the resin is 1%-30%. In this embodiment, the carbon fiber material can be woven in various ways, for example, the carbon fiber material is unidirectionally extended to form a carbon fiber unidirectional belt; another example, the carbon fiber material is bidirectionally extended to form a carbon fiber woven cloth; another example, the carbon fiber material is woven to form a carbon fiber Three-way belt; For example, carbon fiber materials are woven to form a carbon fiber felt, and further, the carbon fiber felt can also be graphitized to form a graphitized carbon fiber felt (graphite felt).

In an optional embodiment, when the carbon fiber material is woven into a unidirectional tape or woven fabric, the carbon fiber unidirectional tape prepreg or the carbon fiber woven fabric prepreg has a tensile modulus greater than 200 Gpa, The carbon fiber material can use Toray's T series T300 and above, all of M series, and other series of the same strength level and materials from other suppliers. It should be noted that Toray's T series and M series are from Toray Corporation of Japan. Carbon fiber models, those skilled in the art can easily obtain these two series of materials.

In an optional embodiment, when the carbon fiber material is woven into a felt, the carbon fiber felt includes one or more of polyacrylonitrile-based carbon fibers, pitch-based carbon fibers, and viscose-based carbon fibers. For example, the carbon fiber felt may be Polyacrylonitrile-based carbon fiber felt, pitch-based carbon fiber felt or viscose-based carbon fiber felt; for another example, the carbon fiber felt can also be a felt made by mixing two or more carbon fiber materials among the above materials. Further, the carbon fiber felt may be one or a mixture of two or more of carbon fiber chopped strand felt, carbon fiber stitched felt, carbon fiber surface felt, carbon fiber continuous felt, and carbon fiber composite felt. The carbon fiber felt or graphite felt in this embodiment can be purchased as a finished product, or can be prepared in the following manner: fiber pre-oxidized filaments (for example, polyacrylonitrile-based fiber pre-oxidized filaments or pitch-based fiber pre-oxidized filaments) are mechanically combed Netting or air-laid netting, and then needle punching to form a pre-oxidized silk felt; the pre-oxidized silk felt is carbonized to form a carbon fiber felt; the carbon fiber felt is graphitized to form a graphite felt. Among them, the fiber pre-oxidized yarn is purchased, and it is obtained by pre-oxidizing the carbon-containing organic fiber precursor under the air medium for tens of minutes or hundreds of minutes.

In an optional embodiment, the number of layers of prepreg in the carbon fiber layer 110 may be 1-20 layers; further, the number of layers of prepreg in the carbon fiber layer 110 may be 2-5 layers.

In this embodiment, the resin may include epoxy resin, polyether ether ketone (PEEK), polyimide (PI), polyphenylene sulfide (PPS), polyparaphenylene benzobisoxazole (PBO) , One or more of poly-p-phenylene terephthalamide (aramid 1414). In some optional embodiments, the mass fraction of the resin in the carbon fiber prepreg is 10% to 55%; further, the mass fraction of the resin in the carbon fiber prepreg is 10% to 35%.

When the carbon fiber layer 110 includes multiple layers of carbon fiber material prepregs, for example, two layers, three layers, or four layers, the carbon fiber materials in the carbon fiber material prepregs of different layers may be the same or different. The weaving mode of the carbon fiber material can be the same or different. The resins in the carbon fiber unidirectional tape prepregs of different layers can be the same or different. The carbon fiber materials in the carbon fiber prepregs of different layers extend in different directions, that is, the angles of the fiber directions are different, which can ensure the various directions of the carbon fiber layer 110. The stress performance of the two adjacent layers of carbon fibers is 0°～90°.

In an optional embodiment, the thickness of the carbon fiber dome 100 is 20 μm to 6000 μm. Further, when the carbon fiber prepreg is a carbon fiber unidirectional tape prepreg, the thickness of the carbon fiber unidirectional tape prepreg is 5 μm-100 μm; when the carbon fiber prepreg is a carbon fiber woven cloth prepreg, the The thickness of the carbon fiber woven fabric is 20 μm to 500 μm, more preferably 60 μm to 120 μm.

The carbon fiber dome 100 of this embodiment can be cut into any desired shape, for example, by means of laser cutting, trimming die punching or touch cutting machine touch cutting; after cutting, it is bonded with the sound film, for example, by Adhesive or glue, etc.; after bonding, the speaker is assembled.

Example 2

2 is a schematic structural diagram of the carbon fiber dome of Example 2 of the present application. As shown in FIG. 2, the carbon fiber dome 200 includes a first carbon fiber layer 210, a foamed material layer 220, and a second carbon fiber layer 230. The first carbon fiber The layer 210 and the second carbon fiber layer 230 are respectively disposed on the upper surface and the lower surface of the foamed material layer 220, the first carbon fiber layer 210 includes one or more layers of carbon fiber material prepreg, and the second carbon fiber layer 230 includes One or more layers of carbon fiber material prepregs, the carbon fiber prepregs include carbon fiber materials, resin, and reinforcing materials dispersed in the resin.

For the description of the first carbon fiber layer 210 and the second carbon fiber layer 230 in this embodiment, please refer to the description of the carbon fiber layer 110 in Embodiment 1, which will not be repeated here.

The difference between this embodiment and Embodiment 1 is that in the carbon fiber dome of this embodiment, the foam material is composited with the carbon fiber prepreg. The foamed material layer 220 contains a large number of fine bubbles or pores, and the average pore diameter of the bubbles or pores is 20 μm or less. In an optional embodiment, the pores in the foamed material layer 220 have a hole diameter of 0.001 μm to 20 μm. In this embodiment, the foamed material layer 220 includes polyethylene terephthalate (PET), polymethacrylimide (PMI), polyphenylene sulfide (PPS), and polyimide. One or more materials among (PI) and polypropylene (PP), select according to the required acoustic vibration range and force range during use. The foamed material layer 220 of this embodiment is a polymer foamed body formed by foaming and molding the above-mentioned polymer material. The foamed material layer contains a large number of fine bubbles or pores, and the average pore diameter of the bubbles or pores is 20μm or less. For example, the foamed material layer 220 may be foamed PET, foamed PMI, foamed PI, foamed PP, or foamed PPS.

Those skilled in the art should understand that in other embodiments, the carbon fiber layer may be provided only on the upper surface or the lower surface of the foamed material layer.

Example 3

Fig. 3 is a flow chart of the preparation method of the carbon fiber dome of Example 3 of the present application. The preparation method is used to prepare the carbon fiber dome of Example 1 of the present application. As shown in Fig. 3, the preparation method includes:

S301, adding a reinforcing material to the resin to form a reinforcing resin.

S302, pre-impregnating the carbon fiber material with the reinforced resin to obtain a pre-impregnated carbon fiber material.

In S303, multiple layers of the pre-impregnated carbon fiber materials are sequentially laminated and then cured.

The method for preparing the dome structure in the embodiment of the present application can form a composite layer by simply pasting it, and then strengthen the dome structure through high temperature and high pressure to obtain a dome structure with excellent mechanical and acoustic properties while ensuring aesthetics. In this embodiment, The method is simple, easy to operate, has low requirements for equipment, and has a wide range of application prospects.

When preparing a dome containing multiple layers of carbon fiber prepregs, different layers of carbon fiber materials extend in different directions to ensure the all-directional force performance of the dome structure.

Example 4

Fig. 4 is a flow chart of the preparation method of the carbon fiber dome of Example 4 of the present application. The preparation method is used to prepare the carbon fiber dome of Example 2 of the present application. As shown in Fig. 4, the preparation method includes:

S401, adding a reinforcing material to the resin to form a reinforcing resin.

S402, pre-impregnating the carbon fiber material with the reinforced resin to obtain the pre-impregnated carbon fiber material.

S403: Pasting one or more layers of the pre-impregnated carbon fiber material on the upper surface and the lower surface of the foamed material layer, respectively, and then performing curing treatment.

Example 5 of the present application provides a speaker, which uses the carbon fiber dome 100 of Example 1 or the carbon fiber dome 200 of Example 2, or the carbon fiber dome obtained by the preparation method of Example 3, or Example 4 The carbon fiber dome is obtained by the preparation method.

The above are only the implementation manners of this application. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of this application, but these all belong to this application. The scope of protection.

Claims

A carbon fiber dome, which is characterized in that the carbon fiber dome includes one or more layers of carbon fiber prepregs, and the carbon fiber prepregs include carbon fiber materials, resin, and reinforcing materials dispersed in the resin.
The carbon fiber dome according to claim 1, wherein the carbon fiber dome further comprises a foam material layer, and the one or more layers of carbon fiber prepreg are disposed on the upper surface of the foam material layer and /Or lower surface.
The carbon fiber dome of claim 1 or 2, wherein the reinforcing material includes one or more of carbon nanotubes, graphene, or silica ceramic particles.
The carbon fiber dome of claim 1 or 2, wherein the mass fraction of the reinforcing material in the resin is 1%-30%.
The carbon fiber dome of claim 1 or 2, wherein the mass fraction of resin in the carbon fiber prepreg is 10% to 55%.
The carbon fiber dome of claim 5, wherein the mass fraction of resin in the carbon fiber prepreg is 10% to 35%.
The carbon fiber dome according to claim 1 or 2, wherein the one or more layers of carbon fiber prepreg comprise carbon fiber unidirectional tape prepreg, carbon fiber woven cloth prepreg or carbon fiber felt prepreg. One or more of.
The carbon fiber dome according to claim 1 or 2, wherein the thickness of the carbon fiber dome is 20 μm to 6000 μm.
A method for preparing a carbon fiber dome according to any one of claims 1 to 8, wherein the preparation method comprises:

Adding reinforcing materials to the resin to form a reinforced resin;

Pre-impregnating the reinforced resin and the carbon fiber material to obtain a pre-impregnated carbon fiber material;

A layer of the prepreg carbon fiber material is cured; or, multiple layers of the prepreg carbon fiber material are sequentially laminated and then cured; or, on the upper surface and/or under the foamed material layer One or more layers of the pre-impregnated carbon fiber material are pasted on the surface and then cured.
A speaker, characterized in that the speaker uses the carbon fiber dome according to any one of claims 1 to 8.