CN111866697A - Sound membrane material and preparation method and application thereof - Google Patents
Sound membrane material and preparation method and application thereof Download PDFInfo
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- CN111866697A CN111866697A CN202010790495.8A CN202010790495A CN111866697A CN 111866697 A CN111866697 A CN 111866697A CN 202010790495 A CN202010790495 A CN 202010790495A CN 111866697 A CN111866697 A CN 111866697A
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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
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/39—Aldehyde resins; Ketone resins; Polyacetals
- D06M15/41—Phenol-aldehyde or phenol-ketone resins
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
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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
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Abstract
The invention provides a sound film material and a preparation method and application thereof, wherein the sound film material comprises a base material and a damping adhesive layer arranged on at least one surface of the base material; the base material is twill cloth. The sound film material reduces nodes at staggered positions through a special weaving structure of twill cloth, and staggered points generating stress concentration are reduced; and the sound diaphragm material is matched with the damping adhesive layer, so that the sound diaphragm material has good fatigue burst strength and reliability in vibration, and the service life of the sound diaphragm material is effectively prolonged. The sound film material is applied to the loudspeaker, so that the loudspeaker has mechanical damping Qms and excellent moisture and heat resistance, the sound film cannot crack under high power, and the sound film material has excellent use stability and reliability.
Description
Technical Field
The invention belongs to the technical field of loudspeakers, and particularly relates to a sound film material and a preparation method and application thereof.
Background
The diaphragm is a key component of the loudspeaker vibration system and has a great influence on the sound quality and the service life of the loudspeaker. In the loudspeaker, the sound film is mainly bonded with the voice coil or the voice coil framework, and after the loudspeaker is electrified, the sound film is driven by the voice coil or the voice coil framework to vibrate in a reciprocating mode. When the factors of the voice diaphragm are studied in the direction of the voice quality, the factors can be roughly classified into two categories: form factor and material factor; the shape factors comprise caliber, depth, sound film curve, thickness, corrugated ring shape and the like, which directly influence frequency response, sound pressure and resonant frequency; the material quality factors mainly affect the inherent timbre, including material characteristics, mixing ratio, additives, preparation method and processing technology. From the aspect of usability, the sound membrane vibrates reciprocally during operation, so that good bending resistance is required, and breakage and shortened service life caused by stress concentration during vibration are reduced or avoided.
The sound film material of the loudspeaker comprises a polymer film, textile, paper material, ceramic material and the like; among them, the woven fabrics exemplified by cotton cloth, silk and silk cloth have good processability and mechanical properties, and have a wide application in the sound film materials of various speakers. For example, CN203072140U discloses a novel sound membrane, which comprises a sound membrane body, wherein the sound membrane body is circular, two circles of grooves are arranged on the side edge of the sound membrane body, a first protrusion is arranged in the middle of the sound membrane body, and W-groove-shaped second protrusions are uniformly distributed on the first protrusion; the sound membrane body is made of cotton cloth. The sound film is not easy to deform, and has strong flatness and sound copper property. CN210431858U discloses a compound sound film speaker monomer, compound sound film speaker monomer's basin frame top is equipped with the sound film, is equipped with compound cloth layer on the ball top upper surface of sound film, compound cloth layer includes silk cloth layer, silica gel layer and PU layer, the upper surface on silica gel layer on be equipped with the silk cloth layer, be equipped with the PU layer on the lower surface on silica gel layer. CN208874723U discloses a coaxial earphone speaker, which includes a support, a bass earphone speaker and a treble earphone speaker; high pitch sound membrane in the high pitch earphone speaker includes second dome, second book ring and dangles limit, and the material of second book ring and dangling limit is one of high damping cotton or silk cloth. CN103686547A discloses a loudspeaker diaphragm, which comprises a ball top located at the center and a ring-folded portion located at the edge, wherein the ball top and/or the ring-folded portion comprise silk cloth and thermoplastic polyurethane combined with the silk cloth, and the surface of the silk cloth is coated with thermosetting adhesive; the silk cloth and the thermoplastic polyurethane are in a hot-pressing combined structure; the diaphragm has good rigidity and damping characteristics.
However, the existing cloth sound film has poor durability and unsatisfactory yield resistance, and the sound film is easy to have stress concentration in the reciprocating vibration working process of the loudspeaker; when the amplitude and power of the vibration are too large, the sound film is broken, which severely shortens the service life of the speaker.
Therefore, it is an important research in the art to develop a sound film material for a speaker having good bending resistance, high reliability and long service life.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a sound membrane material and a preparation method and application thereof, wherein the sound membrane material adopts a twill cloth base material, staggered points generating stress concentration are reduced through a special weaving structure of the twill cloth, and the twill cloth base material is matched with a damping glue layer, so that the sound membrane material has good fatigue burst strength and reliability in vibration, and the service life of the sound membrane material is effectively prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a sound film material, which includes a base material, and a damping adhesive layer disposed on at least one surface of the base material; the base material is twill cloth.
The existing cloth sound membrane material adopts plain cloth, and the structure of the plain cloth is that weft threads are picked one by one and pressed one by one when passing through warp threads, and the weaving is repeated in sequence to form the plain cloth; the cross points of the warp and weft interlacing weaving are more, stress concentration can be generated at the cross positions, and the strain is smaller. When the plain cloth is used as the sound film base material, the reciprocating vibration of the loudspeaker during working can cause the plain cloth to break, and the loudspeaker cannot be used continuously. The sound membrane material provided by the invention takes the twill cloth as a base material, and the twill cloth is structurally characterized in that one weft is picked, two or three weft are pressed, the weft is sequentially circulated, and the weft moves forwards in a staggered manner relative to the previous row in the next row, so that the twill cloth is formed; the twill cloth can reduce nodes at staggered positions and staggered points generating stress concentration; compared with plain cloth, the staggered points in the twill cloth can be reduced by about 1 time. The twill cloth base material and the damping adhesive layer are matched, so that the fatigue burst strength, the reliability during vibration and the damping characteristic of the sound membrane material are improved, and the service life of the sound membrane material is effectively prolonged.
In the invention, the twill cloth comprises any one of twill cotton cloth, twill silk cloth or twill polyester cloth.
Preferably, the woven cloth comprises woven cloth.
Preferably, the weight of the twill is 65-95 g/m2For example 66g/m2、68g/m2、70g/m2、72g/m2、74g/m2、76g/m2、78g/m2、80g/m2、81g/m2、83g/m2、85g/m2、87g/m2、89g/m2、90g/m2、91g/m2、93g/m2Or 94g/m2And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.
In the present invention, the base material is a hardened base material.
Preferably, the hardening treatment agent is a thermosetting phenol resin.
In the invention, the material of the damping rubber layer comprises a composition of styrene-butadiene latex, butyronitrile latex and acrylic emulsion.
The damping rubber layer comprises a combination of styrene-butadiene latex, butyronitrile latex and acrylic emulsion, wherein the acrylic emulsion can increase the flexibility and the processability of the sound film material and has a damping effect; the styrene-butadiene latex and the butyronitrile latex are beneficial to increasing the density of the damping adhesive layer and have a certain moisture-proof effect. The damping adhesive layer endows the sound membrane material with good damping characteristic, processability and moisture resistance through the cooperation of the three materials.
Preferably, the damping rubber layer comprises the following materials in parts by weight: 20-40 parts of styrene-butadiene latex, 20-40 parts of butyronitrile latex and 20-50 parts of acrylic emulsion.
The content of the styrene-butadiene latex in the material of the damping rubber layer is 20 to 40 parts by weight, such as 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 33 parts by weight, 35 parts by weight, 37 parts by weight or 39 parts by weight, and specific values therebetween are not exhaustive, and the invention is not limited to the specific values included in the range for brevity.
The butyronitrile latex is contained in an amount of 20 to 40 parts by weight, for example, 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 33 parts by weight, 35 parts by weight, 37 parts by weight or 39 parts by weight, and specific values therebetween are not exhaustive for the sake of brevity and simplicity.
The acrylic emulsion is contained in an amount of 20 to 50 parts by weight, for example, 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 33 parts by weight, 35 parts by weight, 37 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 43 parts by weight, 45 parts by weight, 47 parts by weight or 49 parts by weight, and specific point values therebetween are not limited to space and for brevity, and the present invention is not exhaustive of the specific point values included in the range.
In the present invention, the thickness of the damping adhesive layer is 0.001-0.1 mm, such as 0.002mm, 0.005mm, 0.008mm, 0.01mm, 0.015mm, 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.095mm, and the specific values between the above values are limited to space and are not exhaustive for the sake of brevity, and the invention does not exhaust the specific values included in the range.
Preferably, the upper surface and the lower surface of the base material are both provided with damping glue layers.
Preferably, the weight of the sound film material is 90-140 g/m2E.g. 92g/m2、95g/m2、98g/m2、100g/m2、102g/m2、105g/m2、108g/m2、110g/m2、112g/m2、115g/m2、118g/m2、120g/m2、122g/m2、125g/m2、128g/m2、130g/m2、132g/m2、135g/m2、137g/m2Or 139g/m2And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.
Preferably, the sound membrane material has a thickness of 0.1-0.3 mm, such as 0.11mm, 0.13mm, 0.15mm, 0.17mm, 0.19mm, 0.2mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm or 0.29mm, and specific values therebetween are not exhaustive, and for brevity and clarity, the invention is not intended to be limited to the specific values included in the scope.
In another aspect, the present invention provides a method for preparing a sound diaphragm material as described above, the method comprising: coating damping glue on at least one surface of the base material, and drying to obtain the sound film material; the base material is twill cloth.
Preferably, the substrate is a hardened substrate.
Preferably, the hardening treatment agent is a thermosetting phenol resin.
Preferably, the hardening treatment method is as follows: and soaking the base material in thermosetting phenolic resin glue solution for treatment, and then drying to obtain the hardened base material.
Preferably, the thermosetting phenolic resin glue solution has a solid content of 0.5-25%, such as 0.8%, 1%, 1.2%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23% or 24%, and specific points between the above points, limited to space and for brevity, the invention is not exhaustive of the included specific points.
Preferably, the drying temperature is 60 to 110 ℃, such as 62 ℃, 64 ℃, 66 ℃, 68 ℃, 70 ℃, 72 ℃, 74 ℃, 76 ℃, 78 ℃, 80 ℃, 82 ℃, 84 ℃, 86 ℃, 88 ℃, 90 ℃, 91 ℃, 93 ℃, 95 ℃, 97 ℃, 99 ℃, 100 ℃, 101 ℃, 103 ℃, 105 ℃, 107 ℃ or 109 ℃, and the specific values therebetween are limited by the space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.
Preferably, the coating method comprises dip coating, knife coating, roll coating or spray coating.
Illustratively, the coating method comprises the following steps: and (3) immersing the base material into a glue groove of the damping glue, and then finishing coating in a glue scraping mode.
Preferably, the damping glue comprises the following components in parts by weight: 20 to 40 parts by weight (e.g., 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 33 parts by weight, 35 parts by weight, 37 parts by weight, 39 parts by weight, etc.), 20 to 40 parts by weight (e.g., 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 33 parts by weight, 35 parts by weight, 37 parts by weight, 39 parts by weight, etc.) of a nitrile latex, and 20 to 50 parts by weight (e.g., 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 33 parts by weight, 35 parts by weight, 37 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 43 parts by weight, 45 parts by weight, 47 parts by weight, or 49 parts by weight.
Preferably, the drying temperature is 60 to 110 ℃, such as 62 ℃, 64 ℃, 66 ℃, 68 ℃, 70 ℃, 72 ℃, 74 ℃, 76 ℃, 78 ℃, 80 ℃, 82 ℃, 84 ℃, 86 ℃, 88 ℃, 90 ℃, 92 ℃, 94 ℃, 96 ℃, 98 ℃, 100 ℃, 101 ℃, 103 ℃, 105 ℃, 107 ℃ or 109 ℃, and the specific values therebetween are not limited by the space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the ranges.
Preferably, the preparation method comprises: dipping the twill cloth in thermosetting phenolic resin glue solution for treatment, and drying at 60-110 ℃ to obtain a hardened base material; and coating damping glue on at least one surface of the base material, and drying at 60-110 ℃ to obtain the sound film material.
Preferably, the sound film material further comprises the steps of hot press forming, cooling and punching.
Preferably, the hot press forming temperature is 210-275 ℃, such as 215 ℃, 220 ℃, 225 ℃, 230 ℃, 235 ℃, 240 ℃, 245 ℃, 250 ℃, 252 ℃, 254 ℃, 256 ℃, 258 ℃, 260 ℃, 261 ℃, 263 ℃, 265 ℃, 267 ℃, 269 ℃, 270 ℃, 271 ℃, 273 ℃ or 274 ℃, and specific values therebetween are limited to space and for brevity, and the invention is not exhaustive enumeration of the specific values included in the range.
Preferably, the dwell time of the hot press forming is 5 to 20s, such as 6s, 8s, 10s, 11s, 13s, 15s, 17s or 19s, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.
In another aspect, the invention provides a loudspeaker, which comprises a sound film, wherein the raw material for preparing the sound film comprises the sound film material.
Compared with the prior art, the invention has the following beneficial effects:
the sound membrane material provided by the invention takes the twill cloth as a base material, and the node at the staggered position is reduced through the special weaving structure of the twill cloth, so that the staggered point generating stress concentration is reduced; and the sound diaphragm material is matched with the damping adhesive layer, so that the sound diaphragm material has good fatigue burst strength and reliability in vibration, and the service life of the sound diaphragm material is effectively prolonged. The sound film material is applied to a loudspeaker, the loudspeaker can have mechanical damping Qms and excellent moisture and heat resistance, the F0 change rate after the sound film material is processed for 24 hours at 40 ℃ and 90% humidity is as low as 1.78%, the sound film material cannot crack under high power, and the sound film material has excellent use stability and reliability.
Drawings
FIG. 1 is a schematic view of the structure of a twill cloth in example 1;
FIG. 2 is a structural diagram of a voice diaphragm component made of the voice diaphragm material provided in example 1;
FIG. 3 is a schematic view showing the structure of the plain cloth of comparative example 1;
FIG. 4 is a structural diagram of a voice diaphragm member made of the voice diaphragm material according to comparative example 1;
fig. 5 is a graph showing a comparison of fatigue burst strengths of speakers made of the sound film materials provided in example 1 and comparative example 1.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The experimental materials used in the following examples and comparative examples of the present invention are as follows:
(1) twill cloth: including twill silk cloth, twill cotton cloth or twill teduo cloth, all purchased from hey state Xinyu electronics ltd;
(2) treating agent for hardening treatment: thermosetting phenolic resin, No. 4703QR, available from hey hou sinyu electronics ltd;
(3) styrene-butadiene latex: 106QR from KUMLHO Corp., Korea; nitrile latex: 341, acrylic emulsion: the products were obtained from the Korean POLYMER corporation under the designation 891K.
Example 1
A sound membrane material comprises twill cloth (twill silk cloth with weight of 80 g/m)2) And the damping glue layers are arranged on two surfaces of the twill cloth, and the schematic structural diagram of the twill cloth is shown in figure 1.
The preparation method comprises the following steps:
(1) dipping the twill cloth in thermosetting phenolic resin glue solution with solid content of 5%, wherein the dipping time is 8s, taking out the twill cloth, drying the twill cloth at 90 ℃ to volatilize the solvent, and obtaining the hardened base material;
(2) uniformly mixing 30 parts by weight of styrene-butadiene latex, 30 parts by weight of butyronitrile latex and 40 parts by weight of acrylic emulsion to obtain damping rubber; and (2) immersing the base material obtained in the step (1) into a glue groove of damping glue, then scraping the glue, drying at 100 ℃, and then coiling the material to obtain the sound diaphragm material.
The sound membrane material provided by the embodiment 1 is placed in a molding press to be subjected to hot press molding at 260 ℃, the pressure is maintained for 10s, and a sound membrane component is obtained after cooling and punching, wherein the organizational structure diagram of the sound membrane component is shown in fig. 2; as can be seen from fig. 2, it has a twill weave structure.
Example 2
A sound membrane material comprises twill cloth (denim, weight of 75 g/m)2) And the damping glue layer is arranged on 1 surface of the twill cloth, and the schematic structural diagram of the twill cloth is shown in figure 1.
The preparation method comprises the following steps:
(1) dipping the twill cloth in thermosetting phenolic resin glue solution with the solid content of 2%, wherein the dipping time is 10s, taking out the twill cloth, drying the twill cloth at 80 ℃ to volatilize the solvent, and obtaining the hardened base material;
(2) uniformly mixing 20 parts by weight of styrene-butadiene latex, 40 parts by weight of butyronitrile latex and 40 parts by weight of acrylic emulsion to obtain damping rubber; and (2) coating the damping glue on one side of the base material obtained in the step (1), drying at 90 ℃, and rolling to obtain the sound membrane material.
Example 3
A sound membrane material comprises twill cloth (Twill Teduolong cloth with weight of 95 g/m)2) And the damping glue layers are arranged on 2 surfaces of the twill cloth, and the schematic structural diagram of the twill cloth is shown in figure 1.
The preparation method comprises the following steps:
(1) dipping the twill cloth in thermosetting phenolic resin glue solution with solid content of 10%, taking out after 10s, drying at 100 ℃ to volatilize the solvent, and obtaining the hardened base material;
(2) uniformly mixing 40 parts by weight of styrene-butadiene latex, 40 parts by weight of butyronitrile latex and 20 parts by weight of acrylic emulsion to obtain damping rubber; and (2) immersing the base material obtained in the step (1) into a glue groove of damping glue, then scraping the glue, drying at 110 ℃, and then coiling the material to obtain the sound diaphragm material.
Example 4
A sound membrane material comprises twill cloth (twill silk cloth with weight of 80 g/m)2) And the damping glue layers are arranged on 2 surfaces of the twill cloth, and the schematic structural diagram of the twill cloth is shown in figure 1.
The preparation method comprises the following steps:
(1) dipping the twill cloth in thermosetting phenolic resin glue solution with the solid content of 25%, taking out after 8s, drying at 95 ℃ to volatilize the solvent, and obtaining the hardened base material;
(2) uniformly mixing 30 parts by weight of styrene-butadiene latex, 20 parts by weight of butyronitrile latex and 50 parts by weight of acrylic emulsion to obtain damping rubber; and (2) immersing the base material obtained in the step (1) into a glue groove of damping glue, then scraping the glue, drying at 100 ℃, and then coiling the material to obtain the sound diaphragm material.
Example 5
A sound membrane material, which is different from the sound membrane material in the embodiment 1 only in that the formula of the damping glue in the step (2) is as follows: 43 parts by weight of styrene-butadiene latex and 57 parts by weight of acrylic emulsion; the other preparation steps of the voice film material are the same as those in embodiment 1.
Example 6
A sound membrane material, which is different from the sound membrane material in the embodiment 1 only in that the formula of the damping glue in the step (2) is as follows: 60 parts by weight of styrene-butadiene latex and 40 parts by weight of acrylic emulsion; the other preparation steps of the voice film material are the same as those in embodiment 1.
Example 7
A sound membrane material, which is different from the sound membrane material in the embodiment 1 only in that the formula of the damping glue in the step (2) is as follows: 50 parts by weight of styrene-butadiene latex and 50 parts by weight of butyronitrile latex; the other preparation steps of the voice film material are the same as those in embodiment 1.
Example 8
A sound membrane material, which is different from the sound membrane material in the embodiment 1 only in that the formula of the damping glue in the step (2) is as follows: 60 parts by weight of nitrile latex and 40 parts by weight of acrylic emulsion; the other preparation steps of the voice film material are the same as those in embodiment 1.
Example 9
A sound membrane material, which is different from the sound membrane material in the embodiment 1 only in that the formula of the damping glue in the step (2) is as follows: 10 parts by weight of styrene-butadiene latex, 30 parts by weight of butyronitrile latex and 60 parts by weight of acrylic emulsion; the other preparation steps of the voice film material are the same as those in embodiment 1.
Example 10
A sound membrane material, which is different from the sound membrane material in the embodiment 1 only in that the formula of the damping glue in the step (2) is as follows: 45 parts by weight of styrene-butadiene latex, 45 parts by weight of butyronitrile latex and 10 parts by weight of acrylic emulsion; the other preparation steps of the voice film material are the same as those in embodiment 1.
Example 11
A sound membrane material, which is different from the sound membrane material in the embodiment 1 only in that the formula of the damping glue in the step (2) is as follows: 50 parts by weight of styrene-butadiene latex, 10 parts by weight of butyronitrile latex and 40 parts by weight of acrylic emulsion; the other preparation steps of the voice film material are the same as those in embodiment 1.
Comparative example 1
A sound membrane material, which is different from the sound membrane material of embodiment 1 only in that the base material is a plain cloth, and the structural schematic diagram of the plain cloth is shown in fig. 3; the other preparation steps of the voice film material are the same as those in embodiment 1.
The voice diaphragm material provided in comparative example 1 was formed into a voice diaphragm member having a structural view as shown in fig. 4 in the same manner as in example 1.
And (3) performance testing:
(1) tension of warp and weft, tension of slant 45 degrees: setting the width of a sample to be tested to be 10mm, and testing by using a servo tensile testing machine (HZ-1003C, Dongguan commercially available force display instrument science and technology Co., Ltd.), wherein the specific steps are carried out according to a method specified in national standard GB/T3923.1-1997 determination of tensile property of fabric-breaking strength and elongation at break;
(2) loudspeaker mechanical damping factor value Qms: assembling the sound film material to be tested into a national photoelectric device P63T loudspeaker, and testing through an electroacoustic testing system (AD0713) of Klippel RD in Germany;
(3) moisture resistance: the sound film material to be tested is assembled into a national photoelectric device P63T loudspeaker, the loudspeaker is placed in a high-temperature hot flash test device (40 ℃, the humidity is 90%) to be tested for 24 hours, the resonance frequency F0 value of a sample is tested, and the resonance frequency F0 value is compared with the F0 value before the high-temperature hot flash test, so that the F0 change rate is obtained; the F0 value was measured by a paper drum F0 tester (TC6000-LK, Tengcheng electronics, Inc.);
(4) and (3) power test: and packaging the sound film material to be tested into a national photoelectric device P63T loudspeaker, testing by adopting a JINGZHEN power test system (JS1131), setting parameters to be 15W and 3.5 omega, carrying out AMS (American society for testing) test, and observing whether the appearance of the sound film changes or not, wherein OK represents no obvious change.
The mechanical properties, damping properties, humidity resistance and power of the sound film materials provided in examples 1 to 11 and comparative example 1 were tested according to the above experimental methods, and the obtained test data are shown in table 1.
TABLE 1
As can be seen from the data in table 1, compared with comparative example 1 in which plain cloth is used as a base material, the sound film materials provided in examples 1 to 11 of the present invention use twill cloth as a base material, yarns are staggered in the twill cloth, when the twill cloth is crossed at 45 degrees, most of the stress is supported by yarn nodes, the twill cloth has a much smaller tension, and the stress is not concentrated, so that the crack phenomenon does not occur in the power test.
A comparison of the fatigue burst strength obtained by the power test is shown in fig. 5. As can be seen from fig. 5, the sound film material in comparative example 1 adopts a plain cloth substrate, and the sound film material provided in example 1 of the present invention has a good fatigue rupture strength without wrinkling or breakage, while the sound film material has a significant rupture phenomenon at an excessive power.
Meanwhile, when the sound film material provided by the invention contains the damping adhesive layer with specific components, and the damping adhesive layer is the combination of the styrene-butadiene latex, the butyronitrile latex and the acrylic emulsion in specific weight parts, the loudspeaker containing the sound film material has excellent high-temperature damp-heat resistance under the premise of certain mechanical damping (Qms), so that the F0 change rate of the loudspeaker is small and can be as low as 1.78%. If the damping rubber layer is not the combination of the styrene-butadiene latex, the butyronitrile latex and the acrylic emulsion in specific mass, the moisture resistance of the sound film material and the loudspeaker comprising the sound film material is reduced, and the F0 change rate is increased.
The applicant states that the present invention is illustrated by the above examples to describe a sound membrane material, a preparation method and applications thereof, but the present invention is not limited to the above process steps, i.e. it does not mean that the present invention must rely on the above process steps to be implemented. It will be apparent to those skilled in the art that any modification of the present invention, equivalent substitutions of selected materials and additions of auxiliary components, selection of specific modes and the like, which are within the scope and disclosure of the present invention, are contemplated by the present invention.
Claims (10)
1. The sound film material is characterized by comprising a base material and a damping adhesive layer arranged on at least one surface of the base material; the base material is twill cloth.
2. The sound diaphragm material according to claim 1, wherein the twill cloth comprises any one of twill cloth, twill silk cloth, or twill polyester cloth;
preferably, the weight of the twill is 65-95 g/m2。
3. The sound diaphragm material according to claim 1 or 2, wherein the base material is a hardened base material;
preferably, the hardening treatment agent is a thermosetting phenol resin.
4. The sound film material as claimed in any one of claims 1 to 3, wherein the material of the damping rubber layer comprises a combination of styrene-butadiene latex, nitrile-butadiene latex and acrylic emulsion;
preferably, the damping rubber layer comprises the following materials in parts by weight: 20-40 parts of styrene-butadiene latex, 20-40 parts of butyronitrile latex and 20-50 parts of acrylic emulsion.
5. The sound film material according to any one of claims 1 to 4, wherein the thickness of the damping glue layer is 0.001 to 0.1 mm;
preferably, the upper surface and the lower surface of the base material are both provided with damping glue layers;
preferably, the weight of the sound film material is 90-140 g/m2；
Preferably, the thickness of the sound film material is 0.1-0.3 mm.
6. A method for preparing a sound diaphragm material according to any one of claims 1 to 5, wherein the method comprises: coating damping glue on at least one surface of the base material, and drying to obtain the sound film material; the base material is twill cloth.
7. The production method according to claim 6, wherein the base material is a hardened base material;
preferably, the hardening treatment agent is a thermosetting phenol resin;
preferably, the hardening treatment method is as follows: soaking the base material in thermosetting phenolic resin glue solution for treatment, and then drying to obtain the hardened base material;
preferably, the solid content of the thermosetting phenolic resin glue solution is 0.5-25%;
preferably, the drying temperature is 60-110 ℃.
8. The method of manufacturing according to claim 6 or 7, wherein the coating method comprises dip coating, knife coating, roll coating, or spray coating;
preferably, the damping glue comprises the following components in parts by weight: 20-40 parts of styrene-butadiene latex, 20-40 parts of butyronitrile latex and 20-50 parts of acrylic emulsion;
preferably, the drying temperature is 60-110 ℃;
preferably, the preparation method comprises: dipping the twill cloth in thermosetting phenolic resin glue solution for treatment, and drying at 60-110 ℃ to obtain a hardened base material; and coating damping glue on at least one surface of the base material, and drying at 60-110 ℃ to obtain the sound film material.
9. A preparation method according to any one of claims 6 to 8, wherein the sound diaphragm material further comprises the steps of hot press forming, cooling and punching;
preferably, the hot-press forming temperature is 210-275 ℃;
preferably, the dwell time of the hot press molding is 5-20 s.
10. A loudspeaker, characterized in that the loudspeaker comprises a sound film, and the raw material for preparing the sound film comprises the sound film material as claimed in any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010790495.8A CN111866697A (en) | 2020-08-07 | 2020-08-07 | Sound membrane material and preparation method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113207077A (en) * | 2021-03-23 | 2021-08-03 | 卢运丰 | Follow progressive loudspeaker box sound diaphragm plate and be stained with device |
| TWI755233B (en) * | 2020-12-31 | 2022-02-11 | 輔仁大學學校財團法人輔仁大學 | Sound membrane structure that can modify the sound quality performance |
| TWI813025B (en) * | 2021-05-03 | 2023-08-21 | 大原祐子 | Horn vibrating piece containing water-soluble phenolic resin and manufacturing method thereof |
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2020
- 2020-08-07 CN CN202010790495.8A patent/CN111866697A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI755233B (en) * | 2020-12-31 | 2022-02-11 | 輔仁大學學校財團法人輔仁大學 | Sound membrane structure that can modify the sound quality performance |
| CN113207077A (en) * | 2021-03-23 | 2021-08-03 | 卢运丰 | Follow progressive loudspeaker box sound diaphragm plate and be stained with device |
| CN113207077B (en) * | 2021-03-23 | 2022-10-04 | 深圳市金隆辉科技有限公司 | Follow progressive loudspeaker box sound diaphragm plate and be stained with device |
| TWI813025B (en) * | 2021-05-03 | 2023-08-21 | 大原祐子 | Horn vibrating piece containing water-soluble phenolic resin and manufacturing method thereof |
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