CN108513244B - Nano carbon tube composite vibration membrane for loudspeaker and its manufacturing method - Google Patents
Nano carbon tube composite vibration membrane for loudspeaker and its manufacturing method Download PDFInfo
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- CN108513244B CN108513244B CN201710107939.1A CN201710107939A CN108513244B CN 108513244 B CN108513244 B CN 108513244B CN 201710107939 A CN201710107939 A CN 201710107939A CN 108513244 B CN108513244 B CN 108513244B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/001—Moulding aspects of diaphragm or surround
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Abstract
A carbon nanotube composite diaphragm for a speaker and a method for manufacturing the same, the carbon nanotube composite diaphragm comprising: a base layer; a carbon nanotube layer coated on the upper surface of the substrate layer, wherein the carbon nanotube layer comprises colloid and carbon nanotube composite material, and is formed by heating the mixed solution of the colloid and the carbon nanotube composite material to evaporate water to form stable carbon nanotube composite material colloid dispersion liquid and spraying the dispersion liquid; wherein, the surface of the carbon nanotube generates modification of partial functional groups, and a novel carbon nanotube composite material is prepared by special modification, thereby effectively improving the sound effect of high frequency and low frequency; in the process of functionalization modification, the structure of the carbon nano-tube can be partially slightly damaged, so that the modified carbon nano-tube can be combined with a material with high acoustic value in an electrostatic adsorption mode and a covalent synthesis mode, and the high-frequency and low-frequency audio performance is improved.
Description
Technical Field
The invention relates to a diaphragm for a loudspeaker, in particular to a carbon nanotube composite diaphragm for the loudspeaker and a manufacturing method thereof.
Background
With the development of human life science and technology, various consumer entertainment products come into play, which symbolize the attention of human to physical and mental feelings, and 3C products provide more convenient information sources, communication media, entertainment options and the like for human, and in these items, sound plays an extremely important role. The sound generator and method for improving sound quality are key media, and earphone, speaker, etc. are developed and improved. However, there is still room for improvement in the way sound is presented in the prior art, and the human needs for sound quality become more stringent with technological progress. The research on the diaphragm and the development of its material are becoming more popular, and the development of a good audio device on 3C products is a very difficult and popular study.
A diaphragm is an indispensable key factor in a delicate audio device, and an excellent diaphragm must provide a wide response frequency range (SPL), generate low basin splitting (i.e., distortion degree, THD) under severe vibration, generate necessary molecular vibration transfer in limited energy and space, be reliable and stable, and have durability, and these objectives need to have the capability of preparing a good composite material, a theoretical design of a solid acoustic and aerodynamic basis, and in addition, have a super-group process capability.
In the prior art, a current is introduced into a coil, a U-shaped permanent magnet is arranged outside the coil as a source of a stable magnetic field, and a long magnet (moving iron) is arranged in the coil (voice coil). The sound film is arranged above the movable iron for a certain distance, when the movable iron pushes the air molecules and transmits the air molecules to the sound film, the sound film receives the kinetic energy of the air molecules to generate corresponding vibration, the vibration further transmits and compresses the air molecules at the upper end of the magnet and the external sound box, medium waves with different density degrees are generated to change, and then sound is generated.
When the frequency of the electronic signal is high, the transmission distance of the energy is short, but the intensity is strong, and the vibration of the air is concentrated on the center of the sound membrane and has high intensity. In contrast, when the frequency of the electronic signal is low, the energy transmission distance is long, but the intensity is weak, and the vibration of the air is concentrated at the peripheral position of the diaphragm and has a low intensity. In order to effectively present high frequency range sound and good sound quality, a stiffer and thinner composition is often required for the middle portion of the diaphragm, since a stiffer and thinner material is more responsive to the movement of high frequency signals, providing better high frequency sound. The opposing diaphragm perimeter requires a relatively thick, soft, and resilient material that helps resonate with low frequency sound waves and transmit a perfectly flat low frequency response.
However, the general diaphragm is made of a homogeneous material, but a material suitable for presenting a high frequency audio signal is not effective for representing a low frequency audio signal, whereas a material suitable for a low frequency audio signal is not suitable for a high frequency audio signal. Therefore, in the improvement of the diaphragm, there is often a need to make some changes or steps to the material design. Diaphragms are often made that effectively interpret only one of the audio frequency manifestations, high or low.
The novel nano-technology provides a new approach for various industrial material innovations, and the novel nano-micron structure is formed by controlling microscopic substances such as atoms, molecules, supermolecules and the like through a fine and smooth microscopic process to generate unique physical, chemical and biological characteristics, wherein the phenomenon is mainly caused by a nano quantum size effect and a surface effect, so that the composition structure, rigidity, electromagnetism, thermal resistance, electric resistance, stress structure and the like of the substances are changed, peculiar properties are generated, and a new application machine is initiated.
Carbon nanotubes are understood to be fantastic materials in the new century, and add a lot of infinite imagination and possibility to the science and technology and life of human civilization. At present, under the efforts of most research teams, the carbon nanotubes are known to a certain extent, and the present inventors have made efforts to research composites with unique rigid structures of carbon nanotubes, and combined with various adhesives and substrates, and hopefully applied to various composite application industries.
Because the multi-walled carbon nanotube has stable structure, high rigidity, good ductility, low density, lightness and thinness, stable electric heating environment and other factors, the feasibility of applying the multi-walled carbon nanotube to acoustic products is shown, and the multi-walled carbon nanotube is a research field which is strong in the company for a long time, the inventor of the invention actively researches and develops a multi-walled carbon nanotube which is combined with a nano material and a glue material and prepares a vibrating membrane by a special pattern carving way, and the invention is expected to create a micro high-tone quality vibrating membrane and an application device.
The inventor of the present invention has made a lot of research on the material of the carbon nanotube, and hopefully, the material characteristics of the carbon nanotube are used to improve the acoustic membrane in the prior art, so that the acoustic membrane can simultaneously generate better response to both low-frequency and high-frequency sound signals, and reduce the distortion, thereby presenting an acoustic device with higher quality of sound.
According to the market report, the product of smart phones, tablet computers, and the like has a shipment volume of 15.53 hundred million (14 hundred million mobile phones, 1.53 hundred million tablet computers), and the growth rate thereof is continuously rising, also bringing the required number of speakers. In a consumer survey of loudspeakers, over 50% of consumers consider their sound quality perception, and about 20% of consumers are primarily concerned with price. Therefore, the inventors of the present invention have developed a carbon nanotube-combined diaphragm, which is expected to have better audio performance and provide better solutions in the electroacoustic industry.
The diaphragm is the most important key component in the acoustic component that affects the sound quality, and the micro-speaker is a component that cannot be lacked by the current smart phone or many electronic devices. Such as notebook computers and tablet computers. Trends points out that in 2016, the stock delivery of smart phones is estimated to be about 14 hundred million, the stock delivery of notebook computers is estimated to be about 1.65 hundred million, and tablet computers are estimated to be 1.53 hundred million. And because the machine design is continuously light and thin, the loudspeaker in the intelligent equipment is also continuously in a shrinking space. The invention hopes to combine the design of the inventor on the carbon nanotube vibrating membrane, and the application of the carbon nanotube vibrating membrane on the sound membrane can provide higher sound expression in smaller mechanism space, so as to be capable of playing a position in the market.
Therefore, the present invention is to provide a novel carbon nanotube composite diaphragm for a speaker and a method for manufacturing the same, so as to solve the above-mentioned drawbacks of the prior art.
Disclosure of Invention
Therefore, the present invention is directed to solve the above problems of the prior art, and the present invention provides a carbon nanotube composite diaphragm for a speaker and a method for manufacturing the same, in which a carbon nanotube layer is coated on a substrate layer, so that the carbon nanotube layer coated on the substrate layer can increase the hardness and toughness thereof, and is suitable for generating resonance response with high-frequency vibration, and can generate a good high-frequency audio signal after resonance, and a portion of the substrate layer located outside the carbon nanotube layer is suitable for absorbing vibration generated by low-frequency energy, thereby generating a good low-frequency audio signal. According to the invention, through the material selection of the carbon nanotube layer and the characteristics of the sizing material, the substrate layer and the carbon nanotubes, the sound presentation performance of the vibrating membrane at high and low frequencies can be effectively improved through adjusting the design, the defect that the vibrating membrane is only suitable for high-frequency signals or only suitable for low-frequency signals in the prior art is effectively overcome, and the sound presentation performance of the whole vibrating membrane is improved.
In order to achieve the above object, the present invention provides a carbon nanotube composite diaphragm for a speaker, comprising: a base layer; a carbon nanotube layer coated on the upper surface of the substrate layer, wherein the carbon nanotube layer comprises colloid and carbon nanotube composite material, and is formed by heating the mixed solution of the colloid and the carbon nanotube composite material to evaporate water to form stable carbon nanotube composite material colloid dispersion liquid and spraying the dispersion liquid; wherein, the carbon nano-tube surface generates the modification of partial functional groups, thereby effectively improving the sound effect of high frequency and low frequency; in the process of functionalization modification, the structure of the carbon nano-tube can be partially slightly damaged, so that the modified carbon nano-tube can be combined with a material with high acoustic value in an electrostatic adsorption mode and a covalent synthesis mode, and the high-frequency and low-frequency tone quality is improved.
Wherein the carbon nanotube composite material is a shortened CNT, an acidified carbon nanotube (COOH-MWCNT), a composite material of silver nanoparticles and the acidified carbon nanotube (AgNPs-COOH-MWCNT), a composite material of gold nanoparticles and the acidified carbon nanotube (AuNPs-COOH-MWCNT), and a composite material of iron nanoparticles and the acidified carbon nanotube (Fe)3O4 NPs-COOH-MWCNT), aluminum iron nano particle and acidified carbon nano tube composite material (Al @ Fe)3O4 NPs-COOH-MWCNT).
Wherein the length of the carbon nanotube composite material is below 100 mu m; wherein the length of the shortened CNT is 1-10 mu m; wherein the sizes of the silver nanoparticles, the gold nanoparticles, the iron nanoparticles and the aluminum iron nanoparticles are between 20 nm and 1 mu m; wherein the heating temperature of the mixed solution is 50-80 ℃; wherein the colloid is one of artificial rubber, natural rubber, UV glue or thermosetting glue stock; wherein, the material of the substrate layer is one of PET, coarse paper, non-woven fabric, silk cloth, aluminum sheet, wood sheet or foam.
The heated mixed solution is sprayed on the substrate layer in a micro bubble spraying mode to form the carbon nanotube layer, and the heated mixed solution is extruded and dispersed at high pressure through a spray head with holes of less than 100 mu m to form fine colloid micro bubbles to be sprayed on the substrate layer.
Wherein, the spraying times are 1 to 16 times, so that the formed carbon nanotube coating has a multilayer hard structure; wherein, the content of the carbon nanotube composite material in the carbon nanotube layer is 2-22%.
The carbon nanotube layer is sprayed on the central part of the upper surface of the substrate layer, so that the carbon nanotube layer is only distributed on the central part of the substrate layer, thereby ensuring that the center of the whole composite vibration film has higher hardness and the periphery of the vibration film is relatively softer.
Wherein, the carbon nanotube layer is sprayed on the central part of the upper surface of the substrate layer and the excircle part which forms a concentric circle with the central part but is not contacted with the central part.
The invention also provides a method for manufacturing the carbon nanotube composite vibration film for the loudspeaker, which comprises the following steps: taking a substrate layer, and cutting the substrate layer into a required shape; mixing the carbon nanotube composite material and the colloid, and then uniformly stirring to obtain a mixed solution; heating the mixed solution to evaporate water in the mixed solution, and only the colloid and the carbon nanotube composite material are left in the mixed solution; spraying the heated mixed solution on the upper surface of the substrate layer to form a carbon nanotube layer.
The invention has the beneficial effects that: the sound effect of the low frequency of the high-frequency machine is effectively improved.
Drawings
FIG. 1 is a schematic view of an assembly of the present invention, in which a carbon nanotube layer is sprayed on the central portion of a substrate layer;
FIG. 2 shows a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of another assembly of the present invention, in which a carbon nanotube layer is sprayed on the entire upper surface of the substrate layer;
FIG. 4 shows a cross-sectional view of FIG. 3;
FIG. 5 is a schematic view of the assembly of the present invention, wherein the carbon nanotube layer is sprayed on the central portion and the outer circumference of the substrate layer;
FIG. 6 shows the cross-sectional view of FIG. 5;
fig. 7 is a flowchart showing a process for manufacturing a carbon nanotube composite diaphragm according to the present invention.
Description of the reference numerals
10 base layer
20 carbon nanotube layer
11 central part
12 at the outer circle part.
Detailed Description
The invention, in accordance with a preferred embodiment thereof, best mode for carrying out the invention, together with the advantages thereof, will be best understood from the following detailed description of specific embodiments when read in connection with the accompanying drawings.
Referring to fig. 1 to 7, a carbon nanotube composite diaphragm for a speaker and a method for manufacturing the same according to the present invention are shown. Generally, the surface of the selected carbon nanotube does not have any functional group and has a length of more than 300 μm, and the carbon nanotube cannot be directly coated on a vibration membrane, so that the carbon nanotube is subjected to chemical treatment to modify part of functional groups on the surface of the carbon nanotube, and simultaneously the length of the carbon nanotube is reduced to be less than 100 μm, and the carbon nanotube subjected to surface functionalization can be more effectively dispersed and combined with colloid by using the functional groups of the carbon nanotube. Then the processed carbon nanotubes are combined with colloid and coated on a vibrating membrane, thereby effectively improving the sound effect of high frequency and low frequency. Wherein, the structure of the carbon nanotube can be partially slightly damaged in the process of functionalization modification, so that the modified carbon nanotube can be combined with a material with high acoustic value (such as metal nanoparticles) in an electrostatic adsorption mode and a covalent synthesis mode to achieve a complementary effect, thereby providing more diversified material selections and applications. The carbon nanotube composite vibration membrane comprises the following components:
a substrate layer 10, the material of the substrate layer 10 can be one of PET, coarse paper, non-woven fabric, silk cloth, aluminum sheet, wood sheet or foam.
A carbon nanotube layer 20 coated on the upper surface of the substrate layer 10, wherein the carbon nanotube layer 20 comprises colloid and carbon nanotube composite material, i.e. the carbon nanotube layer 20 is formed by spraying stable carbon nanotube composite material colloid dispersion liquid formed by heating the mixed solution of the colloid and the carbon nanotube composite material to evaporate water. Wherein the length of the carbon nanotube composite material is less than 100 mu m.
Wherein the carbon nanotube composite material can be shortened CNT, acidified carbon nanotube (COOH-MWCNT), composite material of silver nanoparticle and acidified carbon nanotube (AgNPs-COOH-MWCNT), composite material of gold nanoparticle and acidified carbon nanotube (AuNPs-COOH-MWCNT), and composite material of iron nanoparticle and acidified carbon nanotube (Fe)3O4 NPs-COOH-MWCNT), aluminum iron nano particle and acidified carbon nano tube composite material (Al @ Fe)3O4 NPs-COOH-MWCNT). Wherein the length of the shortened CNT is 1 to 10 mu m.
Wherein the sizes of the silver nanoparticles, the gold nanoparticles, the iron nanoparticles and the aluminum iron nanoparticles are between 20 nm and 1 mu m.
The colloid can be artificial rubber, natural rubber, UV glue or thermosetting glue stock, wherein natural rubber and UV glue are preferred.
Wherein, the content of the carbon nanotube composite material in the carbon nanotube layer 20 can be 2% -22%.
Wherein the heating temperature of the mixed solution is 50-80 ℃.
The heated mixed solution is sprayed on the substrate layer 10 in a micro bubble spraying manner to form the carbon nanotube layer 20, and the heated mixed solution is dispersed by high pressure extrusion through a nozzle with holes of 100 μm or less to form fine colloid micro bubbles to be sprayed on the substrate layer 10. In the spraying process, the number of spraying times may be 1 to 16, so that the carbon nanotube coating 20 has a multi-layer rigid structure.
As shown in fig. 1 and 2, the carbon nanotube layer 20 is sprayed on the central portion 11 of the upper surface of the substrate layer 10, so that the carbon nanotube layer 20 is only distributed on the central portion 11 of the substrate layer 10, and thus the center of the entire composite diaphragm has a higher hardness, and the periphery thereof is relatively flexible.
The carbon nanotube layer 20 can increase the hardness and toughness of the central portion 11, so that the central portion 11 of the substrate layer 10 is suitable for generating resonance response with high-frequency vibration, and can generate better high-frequency audio signals after resonance, and the peripheral portion outside the carbon nanotube layer 20 on the substrate layer 10 is suitable for absorbing low-frequency energy to generate better low-frequency audio signals.
The carbon nanotube composite material used in the present invention may be a nanoparticle-carbon nanotube composite structure combined with nanoparticles, and the design concept and application of the composite structure is based on the expectation of increasing the stress property of the carbon nanotubes after the nanoparticles are attached to the carbon nanotubes, and after the carbon nanotube composite material is sprayed on the substrate layer 10, the nanoparticles increase the stress effect of the carbon nanotubes, thereby increasing the hardness of the entire carbon nanotube layer 20, and simultaneously generating a plurality of stress points on the substrate layer 10. These stress points may also help reduce excessive motion behavior of the entire diaphragm when the substrate layer 10 is vibrated.
Since the carbon nanotube layer 20 has high toughness and rigidity, and the Young's modulus of the carbon nanotube layer can be as high as 1000 times that of steel, the hardness and rigidity of the carbon nanotube layer 20 can be increased by adding the carbon nanotube layer 20 above the substrate layer 10, so that the loudness and the response sensitivity of the carbon nanotube layer can be enhanced for high-frequency vibration, and the quality of the whole high-frequency signal can be highly represented. And the carbon nanotube layer 20 is not added at the outer periphery of the substrate layer 10, so that a better response to a low frequency can be generated.
As shown in fig. 3 and 4, in the present invention, when the upper surface of the substrate layer 10 entirely covers the carbon nanotube layer 20, experiments prove that a relatively good effect can be achieved.
As shown in fig. 5 and 6, in the present invention, when the carbon nanotube layer 20 is sprayed on the central portion 11 of the upper surface of the substrate layer 10 and the outer circular portion 12 which forms a concentric circle with the central portion 11 without contacting, it is proved by experiments that a good effect can still be achieved.
Preferably, in the present invention, the carbon nanotube layer 20 can be formed in various forms, which is helpful to eliminate high-order harmonics, such as second order harmonics, third order harmonics, etc., to generate good sound quality.
As shown in fig. 7, the present invention also includes a process for manufacturing the carbon nanotube composite diaphragm, which includes the following steps:
step 110: taking a substrate layer 10, wherein the material of the substrate layer 10 is PET, coarse paper, non-woven fabric, silk cloth, aluminum sheet, wood sheet or foam. And cutting the substrate layer 10 into a desired shape.
Step 120: mixing the carbon nanotube composite material and the colloid, and stirring uniformly to obtain a mixed solution. Wherein the length of the carbon nanotube composite material is less than 100 mu m.
Step 130: heating the mixed solution to evaporate water in the mixed solution, and only the colloid and the carbon nanotube composite material remain in the mixed solution. Wherein the heating temperature of the mixed solution is 50-80 ℃.
Step 140: the heated mixed solution is sprayed on the upper surface of the substrate layer 10 to form a carbon nanotube layer 20.
In the present invention, the heated mixed solution may be sprayed on the central portion 11 of the upper surface of the substrate layer 10 to form a carbon nanotube layer 20, as shown in fig. 1 and 2 (step 140-1). Therefore, the hardness and toughness of the central portion 11 can be increased, so that the central portion 11 of the substrate layer 10 is suitable for generating vibration corresponding to high-frequency vibration to generate better high-frequency sound, and the peripheral portion outside the carbon nanotube layer 20 on the substrate layer 10 is suitable for absorbing energy of low frequency to generate vibration to generate better low-frequency sound.
Or spraying the heated mixed solution onto the upper surface of the substrate layer 10 to form a carbon nanotube layer 20, as shown in fig. 3 and 4 (step 140-2).
Or the heated mixed solution is sprayed to the central portion 11 of the upper surface of the substrate layer 10 and the outer circumferential portion 12 which forms a concentric circle with the central portion 11 without contacting, thereby forming a carbon nanotube layer 20, as shown in fig. 5 and 6 (step 140-3).
In the above steps 140-1, 140-2, and 140-3, the heated mixed solution is sprayed on the substrate layer 10 by a micro bubble spraying method during spraying to form the carbon nanotube layer 20, and the heated mixed solution is dispersed by a nozzle having holes of 100 μm or less through high pressure squeezing to form fine colloid micro bubbles, and then is sprayed on the substrate layer 10. In the spraying process, the number of spraying times may be 1 to 16, so that the carbon nanotube coating 20 has a multi-layer rigid structure.
Experiments prove that the carbon nanotube layer 20 formed in the step 140-2 or the step 140-3 can obtain quite good effect.
Wherein the carbon nanotube composite material can be shortened CNT, acidified carbon nanotube (COOH-MWCNT), composite material of silver nanoparticle and acidified carbon nanotube (AgNPs-COOH-MWCNT), composite material of gold nanoparticle and acidified carbon nanotube (AuNPs-COOH-MWCNT), and composite material of iron nanoparticle and acidified carbon nanotube (Fe)3O4 NPs-COOH-MWCNT), aluminum iron nano particle and acidified carbon nano tube composite material (Al @ Fe)3O4 NPs-COOH-MWCNT). Wherein the length of the shortened CNT is 1 to 10 mu m.
Wherein the sizes of the silver nanoparticles, the gold nanoparticles, the iron nanoparticles and the aluminum iron nanoparticles are between 20 nm and 1 mu m.
The colloid can be artificial rubber, natural rubber, UV glue or thermosetting glue stock, wherein natural rubber and UV glue are preferred.
Wherein, the content of the carbon nanotube composite material in the carbon nanotube layer 20 can be 2% -22%.
Preferably, in the present invention, the carbon nanotube layer 20 can be formed in various forms, which is helpful to eliminate high-order harmonics, such as second order harmonics, third order harmonics, etc., to generate good sound quality.
The inventor has made a lot of research and experiments on the composite vibration film, the composite vibration film of the present invention is formed by coating a carbon nanotube layer on a substrate layer, so that the hardness and toughness of the carbon nanotube layer coated on the substrate layer are improved, and the composite vibration film is suitable for generating a better high frequency response with high frequency vibration and generating a better high frequency audio signal, and the part of the substrate layer outside the carbon nanotube layer is relatively suitable for absorbing low frequency vibration and generating a better low frequency audio signal. According to the invention, through the material selection of the carbon nanotube layer and the characteristics of the sizing material, the substrate layer and the carbon nanotube, better sound presentation performance can be generated for both high frequency and low frequency, the defect that a vibrating membrane in the prior art is only suitable for high frequency signals or only suitable for low frequency signals is effectively solved, and the performance of the whole sound quality is improved.
The present invention applies the high rigidity carbon nanotube composite material and the colloid to form the carbon nanotube layer 20, which is quite rare compared with the commercially available products. The carbon nanotube layer 20 of the present invention can reduce distortion rate, improve audio performance, and reduce thickness, thereby providing a strong competitive advantage.
The invention applies the modified carbon nano-tube, adjusts the particle size of the carbon nano-tube and applies the carbon nano-tube dispersion technology, thereby increasing the mutual melting property of the carbon nano-tube and the colloid, reducing the distortion rate and easily achieving complex patterns and uniformity.
In conclusion, the humanized body-paste design of the invention is quite in line with the actual requirements. It has the advantages of improved efficiency and easy implementation compared with the prior art. The invention is not disclosed or disclosed in domestic and foreign literature and markets, and conforms to the patent law.
The above detailed description is specific to one possible embodiment of the present invention, but the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A carbon nanotube composite diaphragm for a speaker, comprising:
a base layer;
a carbon nanotube layer coated on the upper surface of the substrate layer, wherein the carbon nanotube layer comprises colloid and carbon nanotube composite material, and is formed by heating the mixed solution of the colloid and the carbon nanotube composite material to evaporate water to form stable carbon nanotube composite material colloid dispersion liquid and spraying the dispersion liquid; the length of the carbon nanotube composite material is below 100 mu m; wherein the heating temperature of the mixed solution is 50-80 ℃; spraying the heated mixed solution onto the substrate layer in a micro-bubble spraying mode to form the carbon nanotube layer, and spraying the heated mixed solution onto the substrate layer through a spray head with holes of less than 100 mu m, wherein the fine colloid micro-bubbles are formed by high-pressure squeezing and scattering;
wherein, the surface of the carbon nano-tube generates the modification of partial functional groups, thereby effectively improving the tone quality of high frequency and low frequency; wherein, the structure of the carbon nano-tube can be partially slightly damaged in the process of functionalization modification, so that the modified carbon nano-tube can be combined with a material with high acoustic value in an electrostatic adsorption mode and a covalent synthesis mode, and the effect of high-frequency and low-frequency sound effect is improved.
2. The carbon nanotube composite diaphragm for speaker of claim 1, wherein the carbon nanotube composite material is a shortened CNT, an acidified carbon nanotube (COOH-MWCNT), a composite material of silver nanoparticles and acidified carbon nanotubes (AgNPs-COOH-MWCNT), a composite material of gold nanoparticles and acidified carbon nanotubes (AuNPs-COOH-MWCNT), a composite material of iron nanoparticles and acidified carbon nanotubes (Fe)3O4 NPs-COOH-MWCNT), aluminum iron nano particle and acidified carbon nano tube composite material (Al @ Fe)3O4 NPs-COOH-MWCNT);
wherein the length of the shortened CNT is 1-10 mu m; wherein the sizes of the silver nanoparticles, the gold nanoparticles, the iron nanoparticles and the aluminum iron nanoparticles are between 20 nm and 1 mu m; wherein the colloid is one of artificial rubber, natural rubber, UV glue or thermosetting glue stock; wherein, the material of the substrate layer is one of PET, coarse paper, non-woven fabric, silk cloth, aluminum sheet, wood sheet or foam.
3. The carbon nanotube composite diaphragm for a speaker according to claim 1, wherein the number of spraying is 1 to 16 times, so that the carbon nanotube coating layer formed has a multi-layer rigid structure; wherein, the content of the carbon nanotube composite material in the carbon nanotube layer is 2-22%.
4. The carbon nanotube composite diaphragm for speaker as claimed in claim 1, wherein the carbon nanotube layer is coated on the central portion of the upper surface of the substrate layer, so that the carbon nanotube layer is only distributed on the central portion of the substrate layer, thereby making the entire composite diaphragm have a higher hardness at the center and a relatively soft periphery.
5. The carbon nanotube composite diaphragm for speaker according to claim 1, wherein the carbon nanotube layer is sprayed on a central portion of the upper surface of the substrate layer and an outer circumferential portion forming a concentric circle with the central portion without contact.
6. A method for manufacturing a carbon nanotube composite diaphragm for a speaker, comprising the steps of:
taking a substrate layer, and cutting the substrate layer into a required shape;
mixing the carbon nanotube composite material and the colloid, and then uniformly stirring to obtain a mixed solution; the length of the carbon nanotube composite material is below 100 mu m;
heating the mixed solution to evaporate water in the mixed solution, and only the colloid and the carbon nanotube composite material are left in the mixed solution; wherein the heating temperature of the mixed solution is 50-80 ℃;
spraying the heated mixed solution on the upper surface of the substrate layer to form a carbon nanotube layer; the heated mixed solution is sprayed on the substrate layer in a micro bubble spraying mode to form the carbon nanotube layer, and the heated mixed solution is extruded and dispersed at high pressure through a spray head with holes of less than 100 mu m to form fine colloid micro bubbles to be sprayed on the substrate layer;
the surface of the carbon nano-tube generates modification of partial functional groups, and the structure of the carbon nano-tube can be partially slightly damaged in the process of the functional modification, so that the modified carbon nano-tube can be combined with a material with high acoustic value in an electrostatic adsorption mode and a covalent synthesis mode, and the effect of high-frequency and low-frequency sound effect is improved.
7. The method of claim 6, wherein the carbon nanotube layer is formed by spraying the carbon nanotube layer onto a central portion of the upper surface of the substrate layer.
8. The method of claim 6, wherein the carbon nanotube composite vibration film is sprayed on a central portion of the upper surface of the base layer and an outer circumferential portion that forms a concentric circle with the central portion without contacting, thereby forming the carbon nanotube layer.
9. The method of manufacturing a carbon nanotube composite diaphragm for a speaker according to claim 6, wherein the number of spraying is 1 to 16 times, so that the carbon nanotube coating layer formed has a multi-layer rigid structure; wherein, the content of the carbon nanotube composite material in the carbon nanotube layer is 2-22%.
10. The method of claim 6, wherein the carbon nanotube composite material is a shortened CNT, an acidified carbon nanotube (COOH-MWCNT), a silver nanoparticle, and an acidified CNTComposite material of tube (AgNPs-COOH-MWCNT), composite material of gold nanoparticles and acidified carbon nanotubes (AuNPs-COOH-MWCNT), and composite material of iron nanoparticles and acidified carbon nanotubes (Fe3O4 NPs-COOH-MWCNT), aluminum iron nano particle and acidified carbon nano tube composite material (Al @ Fe)3O4 NPs-COOH-MWCNT);
wherein the length of the shortened CNT is 1-10 mu m; wherein the sizes of the silver nanoparticles, the gold nanoparticles, the iron nanoparticles and the aluminum iron nanoparticles are between 20 nm and 1 mu m; wherein the colloid is one of artificial rubber, natural rubber, UV glue or thermosetting glue stock; wherein, the material of the substrate layer is one of PET, coarse paper, non-woven fabric, silk cloth, aluminum sheet, wood sheet or foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710107939.1A CN108513244B (en) | 2017-02-27 | 2017-02-27 | Nano carbon tube composite vibration membrane for loudspeaker and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710107939.1A CN108513244B (en) | 2017-02-27 | 2017-02-27 | Nano carbon tube composite vibration membrane for loudspeaker and its manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN108513244A CN108513244A (en) | 2018-09-07 |
| CN108513244B true CN108513244B (en) | 2021-06-11 |
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