阅读说明：本技术 一种用于扬声器的平面振膜复合材料及其制备方法 (Planar diaphragm composite material for loudspeaker and preparation method thereof ) 是由 胡雪玉 于 2021-08-16 设计创作，主要内容包括：本发明公开了一种用于扬声器的平面振膜复合材料及其制备方法,属于扬声器技术领域。平面振膜复合材料由轻质高强基材层以及胶黏在所述基材层上下表面的树脂浸渍平衡纸表层而成。本发明的用于扬声器的平面振膜复合材料具有密度低、质量轻、强度高、超薄、耐高温的优点,通过基材层和树脂浸渍平衡纸表层的复合结构不仅可以提升扬声器的灵敏度,同时因胶黏剂层采用热固性树脂胶,使其还具备有优异的耐温特性,可以在扬声器长时间工作的情况下,不产生材料分层或变形,延长了扬声器的使用寿命。(The invention discloses a planar diaphragm composite material for a loudspeaker and a preparation method thereof, and belongs to the technical field of loudspeakers. The plane vibrating diaphragm composite material is formed by a light high-strength substrate layer and resin-impregnated balance paper surface layers adhered to the upper surface and the lower surface of the substrate layer. The plane vibrating diaphragm composite material for the loudspeaker has the advantages of low density, light weight, high strength, ultrathin property and high temperature resistance, the sensitivity of the loudspeaker can be improved through the composite structure of the base material layer and the resin-impregnated balance paper surface layer, and meanwhile, the adhesive layer is made of thermosetting resin adhesive, so that the plane vibrating diaphragm composite material has excellent temperature resistance, material delamination or deformation is not generated under the condition that the loudspeaker works for a long time, and the service life of the loudspeaker is prolonged.)

1. The utility model provides a plane vibrating diaphragm combined material for speaker which characterized in that, plane vibrating diaphragm combined material is in by the substrate layer and the gluing of light weight high strength the resin impregnation balance paper top layer combination of surface layer forms about the substrate layer.

2. The planar diaphragm composite material for the loudspeaker according to claim 1, wherein the thickness of the substrate layer is 0.3-2.4 mm.

3. The planar diaphragm composite material for a loudspeaker according to claim 1 or 2, wherein the material of the substrate layer is selected from the group consisting of: microporous kraft paper honeycomb, conventional pore size paper honeycomb or high molecular foaming material.

4. The planar diaphragm composite material for the loudspeaker according to claim 3, wherein the pore diameter of the microporous kraft paper honeycomb is 0.69-1.90 mm; the aperture of the conventional aperture paper honeycomb is 1.91-2.75 mm; the density of the polymer foaming material is 31-71 kg/m³。

5. The planar diaphragm composite material for the loudspeaker according to claim 1, wherein the surface layer of the resin-impregnated balance paper has a thickness of 0.07-0.12 mm.

6. The planar diaphragm composite material for a loudspeaker according to claim 1 or 5, wherein the resin-impregnated balance paper surface layer is made of a material selected from the group consisting of: a polymer resin impregnated paper; preferably, the polymer resin impregnated paper is impregnated paper containing a urea-formaldehyde polymer resin and an acrylic polymer resin.

7. The planar diaphragm composite material for the loudspeaker according to claim 1, wherein an adhesive layer formed by an adhesive is further arranged between the substrate layer and the resin-impregnated balance paper surface layer of the planar diaphragm composite material; the adhesive is a thermosetting resin adhesive, preferably thermosetting epoxy resin.

8. The method for preparing a flat diaphragm composite material for a loudspeaker of any one of claims 1 to 7, comprising the steps of:

(1) coating an adhesive on one surface of the resin-impregnated balance paper, which needs to be adhered;

(2) attaching the surface of the resin-impregnated balance paper coated with the adhesive to the upper surface and the lower surface of the base material layer;

(3) laminating the resin-impregnated balance paper surface layer and the substrate layer through flat plate hot pressing;

(4) and after the flat plate is subjected to hot pressing, naturally cooling and shaping, and obtaining the plane vibrating diaphragm composite material.

9. The method for preparing a flat diaphragm composite material for a speaker according to claim 8, wherein the heat-pressing conditions in step (3) are as follows: keeping the pressure for 20-30min at the pressure of 3-6 tons and the hot-pressing temperature of 120-170 ℃.

10. The method for preparing a planar diaphragm composite material for a loudspeaker according to claim 8, wherein the planar diaphragm composite material is cut into different sizes by laser cutting or other cutting methods except laser cutting.

Technical Field

The invention relates to the technical field of loudspeakers, in particular to a planar diaphragm composite material for a loudspeaker and a preparation method thereof.

Background

The loudspeaker unit mainly comprises a vibration sounding part (a vibrating diaphragm, a voice coil, a framework and a dust cover), a supporting reset centering part (a folded ring or a suspended edge, a centering support sheet or an elastic wave) and a magnetic field providing part (a magnet, a magnetic conduction column and an upper magnetic conduction plate and a lower magnetic conduction plate). When an alternating audio voltage signal passes through a voice coil of the loudspeaker, the voice coil is driven by ampere force under the action of a magnetic field, the voice coil reciprocates at the balance position of the voice coil, and the vibrating diaphragm moves together with the voice coil; the vibration of the vibrating diaphragm can push the vibration of the surrounding air medium, and the radiation acoustic resistance is formed at the mechanical end; the energy is transferred through the air medium, so that the electro-mechanical-acoustic conversion is realized. According to the calculation formula of the ampere force, the amplitude of the audio alternating voltage signal is positively correlated with the amplitude of the reciprocating motion of the voice coil, and the larger the amplitude of the music signal is, the louder the sound emitted by the loudspeaker is; while the frequency of the audio voltage signal affects the pitch of the sound.

The loudspeaker diaphragm is the main component of the loudspeaker, and the loudspeaker (especially the midbass loudspeaker) generates sound by converting electromagnetic force to the diaphragm tightly connected with the loudspeaker diaphragm through a voice coil at the center of the diaphragm to form mechanical force so as to complete the electric-force-sound conversion. The diaphragm is the central mechanical part and the most important part in the electro-acoustic-electro-acoustic conversion process, and can affect the acoustic performance of the loudspeaker. The performance of the diaphragm depends on the geometry, material, and processing technology of the diaphragm, and the basic parameters affecting the acoustic performance of the diaphragm material include mass, density, rigidity, internal loss (internal damping), and the like.

The loudspeaker diaphragm has the characteristics of high specific modulus, high specific bending strength, proper internal loss, high fatigue resistance, high aging resistance and the like. Based on these requirements, different materials such as metal, fiber, ceramic, paper and the like are actually used, but each material has inherent characteristics, and paper has poor waterproof performance, large internal loss of metal and low modulus of fiber, so that market development requirements cannot be well met. Therefore, the sandwich composite material with the multilayer structure, which is composed of a plurality of materials with different characteristics, is adopted to obtain the loudspeaker diaphragm with good performance, so that the defects of various single materials are overcome. Therefore, the composite material diaphragm formed by compounding a plurality of materials becomes the development direction of diaphragms used in the field of micro speakers, and the important characteristic is that two or more materials are compounded together by a physical and chemical method, so that the composite material diaphragm has the characteristics of light weight and high strength of sandwich composite materials. The relative balance among the mass, the rigidity and the damping is achieved, so that the loudspeaker has better performance. However, with the increasing performance requirements of downstream industries and the requirements of applications in complex environments, the existing loudspeaker flat diaphragm composite materials are still difficult to meet various requirements.

Disclosure of Invention

The invention aims to provide a planar diaphragm composite material for a loudspeaker and a preparation method thereof, and aims to solve the problem that the conventional planar diaphragm composite material for the loudspeaker is difficult to meet various requirements.

The technical scheme for solving the technical problems is as follows:

the utility model provides a plane vibrating diaphragm combined material for speaker, plane vibrating diaphragm combined material is formed by the combination of the substrate layer of light weight high strength and the resin impregnation balance paper top layer of gluing at the substrate layer upper and lower surface.

Further, in a preferred embodiment of the present invention, the thickness of the substrate layer is 0.3 to 2.4 mm.

Further, in a preferred embodiment of the present invention, the material of the substrate layer is selected from: microporous kraft paper honeycomb, conventional pore size paper honeycomb or high molecular foaming material.

Furthermore, in the preferred embodiment of the present invention, the pore diameter of the microporous kraft paper honeycomb is 0.69 to 1.90 mm; the aperture of the conventional aperture paper honeycomb is 1.91-2.75 mm; the density of the polymer foaming material is 31-71 kg/m³。

Further, in a preferred embodiment of the present invention, the surface layer of the resin-impregnated balance paper has a thickness of 0.07 to 0.12 mm.

Further, in a preferred embodiment of the present invention, the resin-impregnated balancing paper surface layer is made of a material selected from the group consisting of: a polymer resin impregnated paper; preferably, the polymer resin impregnated paper is impregnated paper containing a urea-formaldehyde polymer resin and an acrylic polymer resin.

Further, in a preferred embodiment of the present invention, an adhesive layer formed by an adhesive is further disposed between the substrate layer and the resin-impregnated balance paper surface layer of the planar diaphragm composite material; the adhesive is a thermosetting resin adhesive, preferably thermosetting epoxy resin.

The preparation method of the planar diaphragm composite material for the loudspeaker comprises the following steps:

(1) coating an adhesive on one surface of the resin-impregnated balance paper, which needs to be adhered;

(2) attaching the surface of the resin-impregnated balance paper coated with the adhesive to the upper surface and the lower surface of the base material layer;

(3) laminating the resin-impregnated balance paper surface layer and the substrate layer through flat plate hot pressing;

(4) and after the flat plate is subjected to hot pressing, naturally cooling and shaping, and obtaining the plane vibrating diaphragm composite material.

Further, in a preferred embodiment of the present invention, the heat pressing conditions in the step (3) are as follows: keeping the pressure for 20-30min at the pressure of 3-6 tons and the hot-pressing temperature of 120-170 ℃.

Further, in a preferred embodiment of the present invention, the planar diaphragm composite material is cut into different sizes by laser cutting or other cutting methods except for laser cutting.

The invention has the following beneficial effects:

1. the plane vibrating diaphragm composite material for the loudspeaker has the advantages of low density, light weight, high strength, ultrathin property and high temperature resistance, the sensitivity of the loudspeaker can be improved through the composite structure of the base material layer and the resin-impregnated balance paper surface layer, and meanwhile, the adhesive layer is made of thermosetting resin adhesive, so that the plane vibrating diaphragm composite material has excellent temperature resistance, material delamination or deformation is not generated under the condition that the loudspeaker works for a long time, and the service life of the loudspeaker is prolonged.

2. The composite material for the plane vibrating diaphragm of the loudspeaker adopts a composite structure of the light-weight high-strength substrate layer and the resin-impregnated balance paper surface layer, and can endow the composite material with higher sensitivity through the characteristics of high Young modulus and low density of the substrate layer, so that the loudspeaker is more sensitive in capturing and responding signals. The resin-impregnated balance paper has the characteristics of water resistance, heat resistance, wear resistance, high strength and the like on the surface layer, can play a good protection role and a balance maintaining role on the composite material, enhances the rigidity of the composite material, improves the maximum vibration bearing capacity of the composite material, and maintains the smoothness, the flatness and the non-deformation.

3. According to the plane vibrating diaphragm composite material for the loudspeaker, the adhesive layer is used for bonding the composite structure of the substrate layer and the resin-impregnated balance paper surface layer, the strength, the rigidity and the temperature resistance of the composite material are further improved through the hardness and the toughness of the adhesive layer, the thermosetting resin property of the composite material is improved, and the composite material is prevented from being layered and deformed in the using process.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a planar diaphragm composite material for a loudspeaker according to the present invention.

Detailed Description

The principles and features of the present invention are described below in conjunction with the embodiments and the accompanying drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Referring to fig. 1, the composite material for a planar diaphragm of a speaker of the present invention is composed of a light-weight high-strength substrate layer and resin-impregnated balance paper surface layers adhered to the upper and lower surfaces of the substrate layer.

In the present invention, the material of the base material layer is selected from: microporous kraft paper, paper honeycomb or high molecular foaming material.

In the present invention, there is no particular limitation on the specific selection of the substrate layer in principle, and even though a person in the art can select and adjust the substrate layer according to the application, production and quality requirements, in order to better improve the elastic modulus and low density of the planar diaphragm composite material and improve the sensitivity of the composite material, the material of the substrate layer is preferably: cellular paper honeycomb, conventionalPore size paper honeycomb or polymer foam material. Specifically, the pore diameter of the microporous paper honeycomb is 0.69-1.90 mm, preferably 0.87-1.90 mm, more preferably 1.22-1.90 mm, more preferably 1.53-1.90 mm, more preferably 1.73-1.90 mm, more preferably 1.80-1.90 mm, more preferably 1.82-1.85 mm. The aperture of the conventional aperture paper honeycomb is 1.91-2.75 mm, preferably 2.01-2.56 mm, more preferably 2.08-2.42 mm, and more preferably 2.14-2.35 mm. The density of the polymer foaming material layer is 31-71 kg/m³Preferably 51 to 71kg/m³More preferably 61 to 71kg/m³. In this embodiment, the polymer foam material is specifically a closed-cell polyimide foam.

The invention particularly selects the base material with low density and high strength to reduce the density of the plane diaphragm composite material, and the base material layer with low density and small pore diameter has excellent elastic modulus and low density, and simultaneously, the base material layer as a high-strength material also has excellent properties of strength, rigidity, flame retardance, corrosion resistance, fatigue resistance and the like, and is endowed with excellent temperature resistance.

In the present invention, the material of the resin-impregnated balancing paper surface layer is selected from: the polymer resin impregnates the paper.

The invention has no particular limitation on the specific selection of the surface layer of the resin impregnated balance paper in principle, even though the personnel in the field can select and adjust the resin impregnated balance paper according to the application condition, the production condition and the quality requirement, the invention aims to better enhance the rigidity of the composite material, improve the maximum vibration bearing capacity of the composite material, maintain the smoothness, flatness and difficult deformation, the polymer resin impregnated paper of the invention is impregnated paper containing urea-formaldehyde polymer resin and acrylic polymer resin, the paper is obtained by impregnating by taking the urea-formaldehyde polymer resin and the acrylic polymer resin as impregnating solution, the paper has the density of about (70-120) grams per square meter, has the characteristics of water resistance, heat resistance, wear resistance, high strength and the like, and the paper is taken as the outermost layer of the plane vibrating diaphragm composite material, can play a good role in protecting the composite material and maintaining balance, enhance the rigidity of the composite material, and improve the maximum vibration bearing capacity of the composite material, maintain smooth and flat and are not easy to deform. The resin-impregnated balance paper has the advantages that the surface layer is impregnated with the polymer resin, the good waterproof performance is realized, the drying of the composite material is maintained, the composite material is effectively prevented from being deformed and damaged due to water absorption, and the service life of the loudspeaker is prolonged. In actual use, the resin impregnated balancing paper surface layer can be replaced by other types of polymer resin impregnated paper that perform the balancing function.

In the invention, an adhesive layer formed by an adhesive is further arranged between the base material layer and the surface layer of the resin-impregnated balance paper of the planar diaphragm composite material.

In the invention, the specific selection of the adhesive layer is not particularly limited in principle, even though a person in the field can select and adjust the adhesive layer according to the application condition, the production condition and the quality requirement, in order to improve the temperature resistance of the planar diaphragm composite material, the adhesive is a thermosetting resin adhesive, preferably thermosetting epoxy resin, can be solidified for a period of time at a high temperature of 120-150 ℃, and can not be reversed after being solidified. The thermosetting resin adhesive is a polymer resin adhesive and has the characteristics of excellent stability, heat resistance, corrosion resistance, bending resistance, elasticity, impact resistance and fatigue resistance, and the formed composite material has the advantages of good fastness, corrosion resistance, heat resistance and long service life.

In the invention, the thickness of the substrate layer is 0.3-2.4 mm, and the thickness of the surface layer of the resin-impregnated balance paper is 0.07-0.12 mm. Under the capability of bearing the maximum vibration, the thinner the whole thickness of the vibrating diaphragm is, the better the performances such as transient state, sensitivity and frequency response are, so the thicknesses of the substrate layer and the resin-impregnated balance paper surface layer are not too large or too small, and the thicknesses of the substrate layer and the resin-impregnated balance paper surface layer are too large, so the performances such as transient state, sensitivity and frequency response are poor, and the tone quality effect is poor; the undersize of the substrate layer and the resin impregnated balance paper surface layer can lead to the poor ability that the maximum vibration bore, and the vibrating diaphragm is easy to damage, and after the substrate layer with the thickness of 0.3-2.4 mm and the resin impregnated balance paper surface layer with the thickness of 0.07-0.12 mm are compounded, good performances such as transient state, sensitivity and frequency response can be obtained on the premise of having the ability that the great maximum vibration bore.

The thickness of the adhesive layer does not have an essential requirement, the firm bonding between the substrate layer 1 and the resin-impregnated balance paper surface layer is ensured in principle, and the weight of the whole composite material is reduced as much as possible. Certainly should not the undersize in the thickness on gluing agent layer, otherwise can reduce the adhesive force between substrate layer and the balanced paper top layer of resin impregnation, lead to the balanced paper top layer of substrate layer and resin impregnation to produce the clearance in the vibration process easily, seriously influence tone quality. The thickness of the adhesive layer is not too large, the overall weight of the composite material is increased, and the sensitivity and the frequency response are poor.

The composite material for the plane vibrating diaphragm of the loudspeaker adopts a composite structure of the light-weight high-strength substrate layer and the resin-impregnated balance paper surface layer, and can endow the composite material with higher sensitivity through the characteristics of high Young modulus and low density of the substrate layer, so that the loudspeaker is more sensitive in capturing and responding signals. The resin-impregnated balance paper has the characteristics of water resistance, heat resistance, wear resistance, high strength and the like on the surface layer, can play a good protection role and a balance maintaining role on the composite material, enhances the rigidity of the composite material, improves the maximum vibration bearing capacity of the composite material, and maintains the smoothness, the flatness and the non-deformation. The composite structure of the substrate layer and the resin-impregnated balance paper surface layer is bonded through the adhesive layer, the strength, the rigidity and the temperature resistance of the composite material are further improved through the hardness and the toughness of the adhesive layer, and the composite material is guaranteed not to be layered and deformed.

For further illustration of the present invention, a planar diaphragm composite material for a loudspeaker according to the present invention is described below with reference to the following examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and specific operation procedures are given only for further illustration of the features and advantages of the present invention, not for limitation of the claims of the present invention, and the scope of the present invention is not limited to the following examples.

Example 1

The preparation method of the planar diaphragm composite material for the loudspeaker comprises the following steps:

(1) coating an adhesive on one surface of the resin-impregnated balance paper, which needs to be adhered;

(2) attaching the surface of the resin-impregnated balance paper coated with the adhesive to the upper surface and the lower surface of the base material layer;

(3) laminating the resin-impregnated balance paper surface layer and the substrate layer through flat plate hot pressing;

wherein the hot pressing treatment conditions are as follows: and maintaining the pressure for 30min at the pressure of 3 tons and the hot-pressing temperature of 120 ℃.

Example 2

The preparation method of the planar diaphragm composite material for the loudspeaker comprises the following steps:

(1) coating an adhesive on one surface of the resin-impregnated balance paper, which needs to be adhered;

(2) attaching the surface of the resin-impregnated balance paper coated with the adhesive to the upper surface and the lower surface of the base material layer;

(3) laminating the resin-impregnated balance paper surface layer and the substrate layer through flat plate hot pressing;

wherein the hot pressing treatment conditions are as follows: and keeping the pressure for 25min at 5 tons of pressure and the hot-pressing temperature of 150 ℃.

Example 3

The preparation method of the planar diaphragm composite material for the loudspeaker comprises the following steps:

(1) coating an adhesive on one surface of the resin-impregnated balance paper, which needs to be adhered;

(2) attaching the surface of the resin-impregnated balance paper coated with the adhesive to the upper surface and the lower surface of the base material layer;

(3) laminating the resin-impregnated balance paper surface layer and the substrate layer through flat plate hot pressing;

wherein the hot pressing treatment conditions are as follows: the pressure is maintained for 20min at 6 ton pressure and 170 ℃ hot-pressing temperature.

Test examples

Impregnating the surface layer of the balance paper with 80 g of resin per square meter; a microporous paper honeycomb layer with a pore diameter of 1.83mm and a thickness of 0.8mm and a thermosetting epoxy resin adhesive layer with a thickness of 35 grams per square meter according to the preparation method of the planar diaphragm composite material for a loudspeaker in the embodiment 2, and the total planar diaphragm composite material prepared therebyThe weight of a sample having a thickness of 1.0mm and a thickness of 10cm X10 cm was 3.03 g and the density was 303kg/m³. At a temperature of 140 ℃, no delamination and deformation occurred for 5 minutes.

Impregnating the surface layer of the balance paper with 80 g of resin per square meter; the density was 71kg/m³Polyimide closed-cell foam layer having a thickness of 0.8mm and thermosetting epoxy resin adhesive layer of 35 g per square meter the flat diaphragm composite material for a speaker according to the preparation method of example 2 was prepared to have a total thickness of 1.0mm, a sample of 10cm × 10cm having a weight of 2.80 g and a density of 280kg/m³. At a temperature of 140 ℃, no delamination and deformation occurred for 5 minutes.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.