CN114827880A - Preparation method of composite diaphragm - Google Patents

Preparation method of composite diaphragm Download PDF

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Publication number
CN114827880A
CN114827880A CN202210304171.8A CN202210304171A CN114827880A CN 114827880 A CN114827880 A CN 114827880A CN 202210304171 A CN202210304171 A CN 202210304171A CN 114827880 A CN114827880 A CN 114827880A
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China
Prior art keywords
extruder
composite
diaphragm
layer
damping
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CN202210304171.8A
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汪勇
刘波
郝峰
李生平
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Weifang Tongyou New Material Technology Co ltd
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Weifang Tongyou New Material Technology Co ltd
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/025—Diaphragms comprising polymeric materials

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

The invention belongs to the technical field of electroacoustic diaphragm materials, and particularly relates to a preparation method of a composite diaphragm, which comprises the following steps: (1) drying the raw materials; (2) preparing a damping composite film; (3) and (5) preparing the composite diaphragm. The vibration diaphragm formed by compounding the thermoplastic elastomer layer and the plastic base material layer has the characteristics of excellent tensile strength, large surface friction coefficient, good low-temperature performance, good processing performance and the like, and the damping characteristic of the vibration diaphragm is improved due to the addition of the acrylate block copolymer on the premise of ensuring the strength and toughness of the vibration diaphragm, so that the distortion is effectively reduced, and the acoustic performance of the miniature acoustic generator is improved; meanwhile, the manufacturing process is simple, the production cost is low, and the composite diaphragm is manufactured in a line-down composite mode.

Description

Preparation method of composite diaphragm
Technical Field
The invention belongs to the technical field of electroacoustic diaphragm materials, and particularly relates to a preparation method of a composite diaphragm.
Background
The miniature acoustic generator is an important acoustic component in portable electronic equipment, is used for converting acoustic wave electric signals into sound signals and transmitting the sound signals, and is an energy conversion device. The miniature sounder generally comprises a vibration system and a magnetic circuit system, wherein the vibration system comprises a vibrating diaphragm and a voice coil which are combined together, the vibrating diaphragm comprises an edge part, a folded ring part and a spherical top part which are sequentially combined from outside to inside, the vibrating diaphragm is an important part of the miniature sounder, plays a vital role in the sound reproduction performance of the miniature sounder and determines the conversion quality from electric energy to sound energy of the miniature sounder.
In order to ensure the tone quality of the low-frequency band and the high-frequency band of the miniature acoustic generator, designers often select a high-modulus plastic substrate layer (PEEK, PAR, PEI, PI and the like) and a soft thermoplastic polyurethane elastomer to compound to form a vibrating diaphragm with a composite structure so as to ensure the strength and toughness of the vibrating diaphragm, but the damping property of the vibrating diaphragm compounded by the plastic substrate layer and the thermoplastic polyurethane elastomer is poor, and the performance requirement of the miniature acoustic generator is difficult to meet. In order to improve the damping performance of the vibrating diaphragm, designers can add a damping adhesive layer on the basis of the plastic substrate layer and the thermoplastic polyurethane elastomer, and although the damping performance is improved after the damping adhesive layer is added, the manufacturing process becomes more complicated, and the production cost is correspondingly increased.
Disclosure of Invention
The invention aims to provide a preparation method of a composite diaphragm with simple manufacturing process, low production cost, good strength and toughness and high damping property, so as to solve the problems in the background technology.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a preparation method of a composite diaphragm comprises the following steps:
(1) drying raw materials: adding thermoplastic elastomer resin into a dryer of a No. 1 extruder for drying, and adding the acrylate block copolymer into a dryer of a No. 2 extruder for drying;
(2) preparing a damping composite film: controlling the temperature of the No. 1 extruder to be 220-260 ℃, the rotating speed to be 80-150 rpm, controlling the temperature of the No. 2 extruder to be 180-240 ℃, the rotating speed to be 100-180 rpm, and controlling the temperature of a distribution block and a die head to be 200-250 ℃, and carrying out double-layer co-extrusion casting to obtain a damping composite film;
(3) preparing a composite diaphragm: and extruding the damping composite film, then casting the damping composite film on a plastic base material, extruding the damping composite film by a steel roller, cooling and rolling to obtain the composite diaphragm.
As a modification, in the step (1), the drying temperature of the dryer of the No. 1 extruder is 110 ℃, and the drying time is 4 hours.
As an improvement, in the step (1), the drying temperature of the dryer of the No. 2 extruder is 90 ℃, and the drying time is 4 hours.
In the step (1), the thermoplastic elastomer resin is one or a mixture of more than two of styrene thermoplastic elastomer (SEBS, SEPS, SBS, SIS), polyurethane thermoplastic elastomer (TPU), polyamide thermoplastic elastomer (TPAE) and polyester thermoplastic elastomer (TPEE).
As an improvement, in the step (1), the acrylate block copolymer is one or a mixture of more than two of LA-2230, LA-2250, LA-2330 or LA-2270. The raw materials of the acrylic ester block copolymer are all produced by Nippon Korea.
As an improvement, in the step (2), the screw diameter of the No. 1 extruder is 35mm, and the length-diameter ratio is 40: 1-60: 1, the rotating speed of an extruder is 100-150 rpm, the temperature of the extruder is 220-260 ℃, and the extrusion amount is 30-55 kg/h; the diameter of the screw of the No. 2 extruder is 35mm, the length-diameter ratio is 35: 1-48: 1, the rotating speed of the extruder is 120-180 rpm, the temperature of the extruder is 200-240 ℃, and the extrusion amount is 40-75 kg/h.
As a modification, in the step (3), the plastic substrate is one of PEEK (polyether ether ketone), PEN (polyethylene terephthalate), PI (polyimide), PRA (polyarylate), LCP (liquid crystal polymer), or PEI (polyetherimide).
As an improvement, in the step (3), the composite diaphragm is sequentially provided with a thermoplastic elastomer resin layer, an acrylate block copolymer layer and a plastic substrate layer from top to bottom.
As an improvement, in the step (3), the thickness of the plastic base material layer is 3-50 μm.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention adopts a mode of double-layer coextrusion casting of thermoplastic elastomer resin and acrylate segmented copolymer to prepare the thermoplastic elastomer layer and acrylate damping layer composite material, and simultaneously, the thermoplastic elastomer layer and acrylate damping layer composite material is compounded with a high-modulus plastic base material layer to prepare three-layer composite diaphragm materials of different thermoplastic elastomer layers, acrylate damping layers and high-modulus plastic base material layers.
The thermoplastic elastomer of the composite vibrating diaphragm prepared by the invention has the characteristics of excellent tensile strength, large surface friction coefficient, good low-temperature performance, good processing performance and the like, and the damping characteristic of the vibrating diaphragm is improved due to the addition of the acrylate block copolymer on the premise of ensuring the strength and toughness of the vibrating diaphragm, so that the distortion is effectively reduced, and the acoustic performance of the miniature acoustic generator is improved; meanwhile, the manufacturing process is simple, the production cost is low, and the composite diaphragm is manufactured in a line-down composite mode.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example 1
Adding the TPEE elastomer into a dryer of a No. 1 extruder, wherein the drying temperature is 110 ℃, and the drying time is 4 h; then, the MMA elastomer (acrylate block copolymer) is added into a dryer of a No. 2 extruder, the drying temperature is 90 ℃, and the drying time is 4 hours.
The temperature of the No. 1 extruder is 250 ℃, and the rotating speed of the extruder is 120 rpm; the temperature of the No. 2 extruder is 230 ℃, the rotating speed of the extruder is 100rpm, the temperature of a die head is 240 ℃, and a 20 mu mTPEE film and a 30 mu mMMA damping composite film are prepared by double-layer extrusion casting.
And extruding the damping composite film through a die orifice, casting the damping composite film on a 6 mu mPEEK substrate layer, cooling and rolling to obtain the three-layer composite diaphragm with the 20 mu mTPEE-30 mu mMMA-6 mu mPEEK layer.
Example 2
Adding the TPEE elastomer into a dryer of a No. 1 extruder, wherein the drying temperature is 110 ℃, and the drying time is 4 h; and then adding the MMA elastomer into a dryer of a No. 2 extruder, wherein the drying temperature is 90 ℃ and the drying time is 4 hours.
The temperature of the No. 1 extruder is 260 ℃, and the rotating speed of the extruder is 140 rpm; the temperature of the No. 2 extruder is 240 ℃, the rotating speed of the extruder is 120rpm, the temperature of a die head is 240 ℃, and a 15 mu mTPEE film and a 20 mu mMMA damping composite film are prepared by double-layer extrusion casting.
And extruding the damping composite film through a die orifice, casting the damping composite film on a 3 mu mPEEK substrate layer, cooling and rolling to obtain the three-layer composite diaphragm with the 15 mu mTPEE-20 mu mMMA-3 mu mPEEK layer.
Example 3
Adding the TPAE elastomer into a dryer of a No. 1 extruder, wherein the drying temperature is 110 ℃, and the drying time is 4 hours; and then adding the MMA elastomer into a dryer of a No. 2 extruder, wherein the drying temperature is 90 ℃ and the drying time is 4 hours.
The temperature of the No. 1 extruder is 230 ℃, and the rotating speed of the extruder is 100 rpm; the temperature of the No. 2 extruder is 180 ℃, the rotating speed of the extruder is 140rpm, the temperature of a die head is 240 ℃, and a 30 mu mTPAE film and a 10 mu mMMA damping composite film are prepared by double-layer extrusion casting.
And extruding the damping composite film through a die orifice, casting the damping composite film on a 12 mu mPEN substrate layer, cooling and rolling to obtain the three-layer composite diaphragm with the 30 mu mTPEE-10 mu mMMA-12 mu mPEN layer.
Example 4
Adding the TPEE elastomer into a dryer of a No. 1 extruder, wherein the drying temperature is 110 ℃, and the drying time is 4 hours; and then adding the MMA elastomer into a dryer of a No. 2 extruder, wherein the drying temperature is 90 ℃ and the drying time is 4 hours.
The temperature of the No. 1 extruder is 250 ℃, and the rotating speed of the extruder is 150 rpm; the temperature of the No. 2 extruder is 230 ℃, the rotating speed of the extruder is 160rpm, the temperature of a die head is 250 ℃, and a 15 mu mTPEE film and a 20 mu mMMA damping composite film are prepared by double-layer extrusion casting.
And extruding the damping composite membrane through a die orifice, casting the damping composite membrane on a substrate layer of 8 mu mPI, cooling and rolling to obtain the three-layer composite diaphragm with 15 mu mTPEE-20 mu mMMA-8 mu mPI layers.
Example 5
Adding the TPU elastomer into a dryer of a No. 1 extruder, wherein the drying temperature is 110 ℃, and the drying time is 4 hours; and then adding the MMA elastomer into a dryer of a No. 2 extruder, wherein the drying temperature is 90 ℃ and the drying time is 4 hours.
The temperature of the No. 1 extruder is 250 ℃, and the rotating speed of the extruder is 140 rpm; the temperature of the No. 2 extruder is 220 ℃, the rotating speed of the extruder is 120rpm, the temperature of a die head is 230 ℃, and a 20 mu mTPU film and a 30 mu mMMA damping composite film are prepared by double-layer extrusion casting.
And extruding the damping composite film through a die orifice, casting the damping composite film on a 25 mu mAR substrate layer, cooling and rolling to obtain the three-layer composite diaphragm with 20 mu mTPU-30 mu mMMA-25 mu mAR layer.
Example 6
Adding the TPU elastomer into a dryer of a No. 1 extruder, wherein the drying temperature is 110 ℃, and the drying time is 4 hours; and then adding the MMA elastomer into a dryer of a No. 2 extruder, wherein the drying temperature is 90 ℃ and the drying time is 4 hours.
The temperature of the No. 1 extruder is 220 ℃, and the rotating speed of the extruder is 80 rpm; the temperature of the No. 2 extruder is 200 ℃, the rotating speed of the extruder is 180rpm, the temperature of a die head is 200 ℃, and a 40 mu mTPU film and a 20 mu mMMA damping composite film are prepared by double-layer extrusion casting.
And extruding the damping composite film through a die orifice, casting the damping composite film on a 50 mu mEI substrate layer, cooling and rolling to obtain the three-layer composite diaphragm of 40 mu mTPU-20 mu mMMA-50 mu mEI layer.
Example 7
Adding the SEBS elastomer into a dryer of a No. 1 extruder, wherein the drying temperature is 110 ℃, and the drying time is 4 hours; and then adding the MMA elastomer into a dryer of a No. 2 extruder, wherein the drying temperature is 90 ℃ and the drying time is 4 hours.
The temperature of the No. 1 extruder is 220 ℃, and the rotating speed of the extruder is 115 rpm; the temperature of the No. 2 extruder is 230 ℃, the rotating speed of the extruder is 120rpm, the temperature of a die head is 230 ℃, and the 25 mu mSEBS film and the 20 mu mMMA damping composite film are prepared by double-layer extrusion casting.
And extruding the damping composite film through a die orifice, casting the damping composite film on a 6 mu mPEEK substrate layer, cooling and rolling to obtain the three-layer composite diaphragm with the 25 mu mTPU-20 mu mMMA-6 mu mPEEK layer.
The performance indexes of the composite diaphragm prepared in the embodiments 1 to 7 are shown in the following table 1:
Figure BDA0003564172140000061
TABLE 1
As can be seen from table 1, the composite diaphragm material provided by the invention can be produced on the existing equipment, the product preparation process is simple, the process is simple and convenient, the operation is easy, three-layer composite diaphragms with different thicknesses and types can be prepared by a one-step casting method, different types of elastomer diaphragm materials can be prepared by different types of thermoplastic elastomer resins, composite diaphragms with different thicknesses can be prepared by different extrusion speeds, and diaphragm composites with different thicknesses and types can be prepared by attaching different rigid diaphragm materials.
The composite diaphragms with different types, different thicknesses and different structures are prepared in a double-layer co-extrusion mode of a thermoplastic elastomer material and an acrylate block copolymer; the composite diaphragm with different structures is prepared by one-step molding through a double-layer co-extrusion casting method, the process is simple, the operation is convenient, the structure and the F0 can be designed according to the requirements of customers, the customers do not need to laminate and process the diaphragm material, the customers are greatly facilitated, and the yield and the efficiency of the diaphragm composite film are improved.
The vibration film layer prepared by casting the styrene thermoplastic elastomer, the polyurethane thermoplastic elastomer, the polyester thermoplastic elastomer or the polyamide thermoplastic elastomer has the advantages of high tensile strength, good toughness of the film, high and low temperature resistance and the like.
The preparation process of the composite diaphragm is simple, the working procedures are simple and convenient, the operation is easy, and three-layer composite diaphragms with different structures and types can be prepared by a one-step tape casting method; the damping layer which can play a role in bonding and has an excellent damping effect is prepared by casting the acrylate block copolymer; the composite diaphragm with appearance can be prepared by adopting steel rollers with different shapes and depths to carry out hot pressing; the diaphragm prepared by the invention.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (8)

1. A preparation method of a composite diaphragm is characterized by comprising the following steps:
(1) drying raw materials: adding the thermoplastic elastomer resin into a dryer of a No. 1 extruder for drying, and adding the acrylate block copolymer into a dryer of a No. 2 extruder for drying;
(2) preparing a damping composite film: controlling the temperature of the No. 1 extruder to be 220-260 ℃, the rotating speed to be 80-150 rpm, controlling the temperature of the No. 2 extruder to be 180-240 ℃, the rotating speed to be 100-180 rpm, and controlling the temperature of a distribution block and a die head to be 200-250 ℃, and carrying out double-layer co-extrusion casting to obtain a damping composite film;
(3) preparing a composite diaphragm: and extruding the damping composite film, then casting the damping composite film on a plastic base material, extruding the damping composite film by a steel roller, cooling and rolling to obtain the composite diaphragm.
2. The method for preparing a composite diaphragm according to claim 1, wherein in the step (1), the drying temperature of the dryer of the No. 1 extruder is 110 ℃ and the drying time is 4 hours.
3. The method for preparing a composite diaphragm according to claim 1, wherein in the step (1), the drying temperature of the dryer of the No. 2 extruder is 90 ℃ and the drying time is 4 hours.
4. The method of manufacturing a composite diaphragm according to claim 1, wherein in step (1), the thermoplastic elastomer resin is one or a mixture of two or more of a styrene thermoplastic elastomer, a polyurethane thermoplastic elastomer, a polyamide thermoplastic elastomer, or a polyester thermoplastic elastomer.
5. The method for preparing a composite diaphragm according to claim 1, wherein in the step (1), the acrylate block copolymer is one or a mixture of more than two of LA-2230, LA-2250, LA-2330 and LA-2270.
6. The method of preparing a composite diaphragm according to claim 1, wherein in step (3), the plastic substrate is one of PEEK, PEN, PI, PRA, LCP, or PEI.
7. The method of claim 1, wherein in step (3), the composite diaphragm comprises, from top to bottom, a thermoplastic elastomer resin layer, an acrylate block copolymer layer, and a plastic substrate layer.
8. The method for preparing a composite diaphragm according to claim 7, wherein in the step (3), the thickness of the plastic substrate layer is 3 to 50 μm.
CN202210304171.8A 2022-03-25 2022-03-25 Preparation method of composite diaphragm Pending CN114827880A (en)

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Application Number Priority Date Filing Date Title
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Publications (1)

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CN114827880A true CN114827880A (en) 2022-07-29

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