CN110636418B - Loudspeaker cone and preparation method and application thereof - Google Patents
Loudspeaker cone and preparation method and application thereof Download PDFInfo
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- CN110636418B CN110636418B CN201910953774.9A CN201910953774A CN110636418B CN 110636418 B CN110636418 B CN 110636418B CN 201910953774 A CN201910953774 A CN 201910953774A CN 110636418 B CN110636418 B CN 110636418B
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- acrylic emulsion
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Abstract
The invention provides a loudspeaker cone and a preparation method and application thereof, wherein the loudspeaker cone is prepared from the raw materials of paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin; the cationic styrene-acrylic emulsion and the emulsified paraffin are matched with each other in a synergistic manner, so that the loudspeaker cone has excellent waterproof and moistureproof performances, the waterproofness can reach IPX7 level, the water absorption is lower than 4.72%, and the application of the loudspeaker in underwater and humid outdoor can be fully met. The loudspeaker cone can be prepared by mixing and dispersing paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin, and then fishing for pulp, hot press molding and punching, or can be prepared by mixing and dispersing paper pulp and cationic styrene-acrylic emulsion, then fishing for pulp, hot press molding and punching, further coating the emulsified paraffin on the surface and drying; the preparation process is simple and controllable, the loudspeaker cone with uniform quality and stability can be obtained, and the application prospect is wide.
Description
Technical Field
The invention belongs to the technical field of loudspeakers, and particularly relates to a loudspeaker cone and a preparation method and application thereof.
Background
The cone is an important component of the sound generating unit in a loudspeaker, whose main function is to provide an accurate frequency response. The cone can be divided into a cone, a metal cone, a ceramic cone, a PP (polypropylene) cone and a composite material cone according to the material, wherein the cone has the characteristics of natural tone, low cost, good processability and the like, and has very wide application. The main raw material of the cone is plant fiber, so that the cone is endowed with natural hydrophilicity, the waterproof performance of the cone is poor, after the cone absorbs water and is affected with damp, on one hand, the mechanical performance of the cone is greatly reduced, on the other hand, the cone is heavy, and the acoustic characteristic of the loudspeaker is changed; after the paper basin is subjected to dry and wet cycles for many times, the material can be fatigued, and even the paper basin can be irreversibly deformed and damaged; therefore, it is necessary to waterproof and moistureproof the paper cone. In addition, the audio products are increasingly applied to harsh environments such as outdoors and underwater, which also puts higher requirements on the waterproof grade of the cone.
CN101394682A discloses a waterproof cone for a loudspeaker and a manufacturing method thereof, wherein the waterproof cone product is formed by compounding a waterproof composite edge and a waterproof paper cone; the waterproof composite edge is a waterproof rubber edge, a waterproof cloth edge or a waterproof foam edge treated by a special impregnant; the waterproof paper cone is prepared by adding a medicament into paper pulp, and then performing processes of pulping, filtering, sizing, fishing and pressing, punching, hot-pressing compounding and the like, wherein the medicament comprises 7-12% of dye, 6-10% of aluminum sulfate, 1-5% of amphoteric polyacrylamide BR-2300, 1-4% of polyamide polyamine epoxy chloropropane SW-010 and 1-3% of refined rosin PC-8000, and the refined rosin PC-8000 is a waterproof agent. After the paper cone is subjected to waterproof process treatment, the waterproof performance is good, the paper cone is not only suitable for being used in a dry environment, but also suitable for being used in a wet environment, and the defect of poor waterproof performance of the conventional paper cone is overcome.
CN106255030A discloses a method for manufacturing a moisture-proof cone for a loudspeaker, which specifically comprises the following steps: (1) preparing a paper pulp suspension: the weight ratio of the components of the pulp suspension is as follows: 60-70% of plant fiber, 3-5% of dye, 1-3% of melamine resin, 10-15% of barium sulfate, 6-10% of aluminum sulfate and 1-3% of rosin; (2) slurry fishing and hot-press molding: the paper pulp suspension flows into a copper wire mesh with 50 meshes or 100 meshes, is adsorbed on the copper wire mesh, is fished for forming, and is then hot-pressed and formed by a paper machine; (3) gluing and punching: spraying acrylic acid polyester waterproof agent on the surface of the paper cone after hot press forming, drying and punching forming. The moisture-proof cone for the loudspeaker prepared by the method has the advantages of good toughness, strong moisture-proof capability and low manufacturing cost.
CN106948211A discloses a waterproof flame-retardant cone, the pulp of which is mainly prepared by mixing and stirring the following raw materials: wood pulp, sisal, cotton pulp, kapok, bulletproof fiber, wool, glass fiber, dye, salt, a hardening agent, a toughening agent, a regulator, a waterproof agent and a flame retardant; the waterproof agent is prepared by mixing acrylic latex, hydroxyethyl cellulose, bentonite and sodium metasilicate in a mass ratio of 1 (0.1-0.5) to (0.2-0.5) and (0.05-0.2) in water to form emulsion and then performing reflux reaction for 3-4 hours. The waterproof and flame-retardant cone has soft sound effect, good moisture-proof and waterproof performance, flame retardant performance and mechanical performance, improves the use safety of the cone and prolongs the service life.
However, in the prior art, most of the waterproof and moistureproof agents contain a large amount of inorganic fillers, so that the weight of paper is greatly increased, and the film forming continuity of other paper auxiliaries can be damaged, so that the mechanical property of a cone is reduced; in addition, the addition of the inorganic filler can change the proportion of various paper pulps in the cone and influence the tone quality of the loudspeaker. More importantly, the waterproof and moistureproof agent in the prior art can only control the water absorption rate of the cone, but cannot enable the cone to have the performance of completely non-seepage, so that the cone cannot be used in harsh environments such as underwater and the like.
Therefore, the development of the loudspeaker cone with good waterproof and moistureproof performances and stable mechanical performance, tone quality and tone color to meet the application requirements of the loudspeaker in harsh environments such as outdoor environment, underwater environment and the like is a research focus in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the loudspeaker cone and the preparation method and application thereof, and the loudspeaker cone is endowed with excellent waterproofness and moisture resistance through the synergistic compounding of paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin, so that the application requirements of the loudspeaker in underwater and outdoor humid environments are fully met.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a loudspeaker cone, and the loudspeaker cone is prepared from raw materials including paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin.
The speaker cone provided by the invention is prepared from raw materials including paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin. The paper pulp contains a large amount of plant fibers with negative charges on the surface, and the polymer particles of the cationic styrene-acrylic emulsion have positive charges on the surface and can be effectively combined with the plant fibers with the negative charges through electrostatic interaction; in the hot press molding stage of the cone, polymer particles of the cationic styrene-acrylic emulsion are spread on the surface of plant fibers to form a film due to the thermoplastic effect, and the plant fibers are coated in the polymer film, so that the polymer film has good water resistance and endows the cone with good moisture-proof and water-proof properties; in addition, the cationic styrene-acrylic emulsion and the plant fiber have strong electrostatic binding force, so that the loss of the emulsion is greatly reduced during papermaking, and the waste is avoided.
The raw materials for preparing the loudspeaker cone also comprise emulsified paraffin, wherein the emulsified paraffin can be adsorbed on the surface of plant fibers, and blocks pores among the fibers to a certain extent, so that a moisture transfer channel is cut off, and the contact area between water and the fibers is reduced; meanwhile, the emulsified paraffin can cover and seal hydrophilic groups such as-OH and the like on the fiber surface, increase the proportion of hydrophobic groups such as methyl, methylene and the like, and reduce the surface free energy of the fiber surface, so that the paper basin achieves the waterproof and moistureproof effects and prevents water from permeating in the paper basin.
In the loudspeaker cone, the plant fiber, the cationic styrene-acrylic emulsion and the emulsified paraffin in the paper pulp are cooperatively matched with each other, so that the loudspeaker cone has the waterproof and moistureproof performance. Different from the waterproof and moistureproof cone containing inorganic filler in the prior art, the cationic styrene-acrylic emulsion and the emulsified paraffin have high waterproof and moistureproof efficiency, excellent waterproof and moistureproof performance can be achieved by adding a small amount of the emulsion and the emulsified paraffin, the combination of the emulsion and the pulp does not cause great weight increase of paper, the proportional relation among various kinds of pulp is not influenced, and the film forming continuity of the paper and other auxiliary agents is not damaged; more importantly, the coating effect of the styrene-acrylic polymer film and the emulsified paraffin on the surface of the plant fiber is beneficial to improving the physical strength of the cone and has positive effects on the mechanical strength and the mechanical stability of the loudspeaker cone.
Preferably, the mass of the cationic styrene-acrylic emulsion is 3-15% of the mass of the oven dry pulp, such as 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 14.5%, and the specific values therebetween are limited by space and for the sake of brevity, and the invention does not exhaustive list the specific values included in the range, and further preferably 5-15%.
In the present invention, the oven dried pulp means a solid portion in the pulp, i.e., a moisture-free pulp; the same description (oven dried pulp) is referred to below with the same meaning.
As a preferable technical scheme, the mass of the cationic styrene-acrylic emulsion is 3-15% of that of the oven dry pulp. If the addition amount of the cationic styrene-acrylic emulsion is less than 3% of the mass of the absolute dry pulp, the combination amount of the cationic styrene-acrylic emulsion on the plant fiber is small, polymer particles of the cationic styrene-acrylic emulsion cannot be spread to form a film on the surface of the plant fiber during hot press molding, and the polymer film cannot effectively coat the plant fiber, so that the waterproof and moistureproof performance of the paper basin is reduced. If the addition amount of the cationic styrene-acrylic emulsion is more than 15% of the mass of the absolute dry pulp, on one hand, part of the cationic styrene-acrylic emulsion cannot be combined with the plant fibers and is dissociated outside a fiber network of the paper basin, so that the mechanical property and the processing property of the paper basin are influenced by over plasticization of the paper basin, and meanwhile, the excessive cationic styrene-acrylic emulsion can cause flocculation of the plant fibers, so that the thickness of the paper basin is not uniform, the water filtering time is prolonged during paper making, and the efficiency is reduced; on the other hand, excessive cationic styrene-acrylic emulsion can generate bubbles in the pulp tank, influence the thickness uniformity of the papermaking cone and bring adverse effect to the coloring property of the cone; in addition, the paper is increased in weight due to the excessive addition of the cationic styrene-acrylic emulsion, and the subsequent application of the cone is not facilitated.
Preferably, the pH value of the cationic styrene-acrylic emulsion is 4.0-6.0, for example, the pH value may be 4.2, 4.4, 4.6, 4.8, 5.0, 5.2, 5.4, 5.6, 5.8, or 5.9.
Preferably, the latex particle size of the cationic styrene-acrylic emulsion is 50-100 nm, such as 52nm, 55nm, 58nm, 60nm, 63nm, 65nm, 68nm, 70nm, 72nm, 75nm, 77nm, 80nm, 82nm, 85nm, 88nm, 90nm, 92nm, 95nm, 97nm or 99 nm.
Preferably, the Zeta potential of the cationic styrene-acrylic emulsion is 40-60 mV, such as 42mV, 44mV, 46mV, 48mV, 50mV, 52mV, 54mV, 56mV, 58mV or 59 mV.
As a preferred technical scheme, the pH value of the cationic styrene-acrylic emulsion is 4.0-6.0, the particle size of latex particles is 50-100 nm, and the Zeta potential is 40-60 mV; the cationic styrene-acrylic emulsion can be a commercial product, so that parameters such as molecular weight, solid content and the like of the emulsion are not specially limited. Illustratively, TF-535 in Zhejiang chemical industry can be selected as the cationic styrene-acrylic emulsion, and the solid content of the emulsion is 23 +/-1%.
Preferably, the mass of the emulsified paraffin is 1-5% of the mass of the oven dry pulp, such as 1.3%, 1.5%, 1.8%, 2%, 2.3%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.7%, 4%, 4.2%, 4.5%, 4.7%, or 4.9%, and specific points between the above points are limited to space and for the sake of brevity, and the invention is not exhaustive of the specific points included in the range.
According to the preferable technical scheme, the mass of the emulsified paraffin is 1-5% of the mass of the oven-dry pulp. If the addition amount of the emulsified paraffin is less than 1% of the absolute dry pulp, the adsorption amount of the emulsified paraffin on the surface of the plant fiber is too low, the contact between water molecules and the fiber cannot be effectively reduced, and a transmission channel of water in the paper basin cannot be cut off, so that the waterproof and moistureproof performance of the paper basin is reduced. If the addition amount of the emulsified paraffin is more than 5 percent of the mass of the absolute dry pulp, not only is the waste of raw materials caused, but also the excessive emulsified paraffin can influence the film forming performance of paper and other auxiliary agents in the hot press forming stage, influence the mechanical property of a paper cone and the later processing technology of a loudspeaker and also have adverse influence on the timbre and the tone quality of the loudspeaker.
Preferably, the pH of the emulsified paraffin is 3.0 to 5.0, for example, the pH may be 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4, 4.6, 4.8, or 4.9.
As a preferable technical scheme, the pH value of the emulsified paraffin is 3.0-5.0; the emulsified paraffin can be a commercial product, so that the parameter information such as the particle size, the type of the emulsifier and the like is not specially limited. Illustratively, the emulsified paraffin wax of the present invention may be KSJ from Kyork electro-acoustic technology development, Inc. of Guangzhou city, and the emulsifier is Tween-60 and/or Span-80.
Preferably, the mass ratio of the cationic styrene-acrylic emulsion to the emulsified paraffin is (1-7): 1, such as 1.2:1, 1.5:1, 1.8:1, 2:1, 2.3:1, 2.5:1, 2.7:1, 3:1, 3.2:1, 3.5:1, 3.8:1, 4:1, 4.2:1, 4.5:1, 4.7:1, 5:1, 5.3:1, 5.5:1, 5.8:1, 6:1, 6.2:1, 6.5:1, 6.7:1 or 6.9: 1.
The technical effect of water and moisture resistance of the cone is realized by synergistic compounding of the paper pulp, the cationic styrene-acrylic emulsion and the emulsified paraffin, and the technical effect can be realized by raw materials in the optimal range of the invention.
In another aspect, the present invention provides a method for manufacturing a speaker cone according to the first aspect, the speaker cone being manufactured by the following manufacturing method I or manufacturing method II.
The preparation method I comprises the following steps: mixing and dispersing paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin, and then carrying out pulp fishing, hot-press molding and punching to obtain the loudspeaker cone.
The preparation method II comprises the following steps: mixing and dispersing paper pulp and cationic styrene-acrylic emulsion, and then carrying out pulp fishing, hot-press molding and punching to obtain a pretreated cone; and coating emulsified paraffin on the surface of the pretreated cone paper, and drying to obtain the loudspeaker cone paper.
In the invention, the specific process steps of slurry fishing, hot press molding and punching can be carried out by referring to the prior art. Illustratively, the slurry salvaging net of the slurry salvaging is an 80-mesh copper net matched with an 80-mesh copper net, or the 80-mesh copper net matched with a 60-mesh copper net; the pressure of hot-press molding is 0.5 +/-0.1 MPa, the temperature is 170-250 ℃, and the time is 5-120 s. For the sake of simplicity, the present invention does not describe the process steps of slurry pumping, hot press forming and punching in detail.
Preferably, the pulp obtained by the preparation method I and the preparation method II is pulp obtained by beating.
Preferably, the beating method comprises the following steps: and (3) shredding the pulp board, placing the shredded pulp board in a pulping machine, adding water, pulping, and diluting the obtained pulp with water to obtain the paper pulp.
Preferably, the mixing and dispersing of the preparation method I and the preparation method II are carried out under stirring conditions.
In the invention, the mixing and dispersing of the preparation method I and the preparation method II are carried out in a slurry tank, and a circulating pump is arranged in the slurry tank to ensure that all components can be uniformly dispersed.
Preferably, the method for preparing the coating described in method II is spraying.
Preferably, the drying temperature in the preparation method II is 100-110 ℃, such as 101 ℃, 102 ℃, 103 ℃, 104 ℃, 105 ℃, 106 ℃, 107 ℃, 108 ℃ or 109 ℃, and more preferably 103-107 ℃.
Preferably, the drying time in the preparation method II is 10-50 min, such as 15min, 20min, 22min, 24min, 26min, 28min, 30min, 32min, 34min, 36min, 38min, 40min, 45min or 48min, and more preferably 25-35 min.
Preferably, the preparation method I specifically comprises: shredding a pulp board, placing the shredded pulp board in a pulping machine, adding water, and pulping to obtain pulp, and diluting the obtained pulp with water to obtain the paper pulp; and adding the cationic styrene-acrylic emulsion and the emulsified paraffin into the paper pulp, stirring and dispersing, and then carrying out pulp fishing, hot press molding and punching to obtain the loudspeaker cone.
Preferably, the preparation method II specifically comprises: shredding a pulp board, placing the shredded pulp board in a pulping machine, adding water, and pulping to obtain pulp, and diluting the obtained pulp with water to obtain the paper pulp; adding cationic styrene-acrylic emulsion into paper pulp, stirring and dispersing, and then carrying out pulp fishing, hot-press molding and punching to obtain a pretreated paper basin; and spraying emulsified paraffin on the surface of the pretreated cone paper, and drying at 100-110 ℃ for 10-50 min to obtain the loudspeaker cone paper.
In another aspect, the present invention provides a loudspeaker comprising a loudspeaker cone as described in the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
the preparation raw materials of the loudspeaker cone provided by the invention comprise paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin, wherein the cationic styrene-acrylic emulsion and the emulsified paraffin are matched with each other in a synergistic manner and interact with plant fibers in the paper pulp, so that the loudspeaker cone is endowed with excellent waterproof and moisture-proof performances, the waterproofness can reach IPX7 level, the humidity is 85%, the water absorption rate of the loudspeaker cone stored for 14 days in an environment at 25 ℃ is lower than 4.72%, even lower than 4.13%, and the application of the loudspeaker cone under harsh conditions of underwater, humid outdoor and the like can be fully met. The loudspeaker cone can be prepared by mixing and dispersing paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin, and then fishing for pulp, hot press molding and punching, or can be prepared by mixing and dispersing paper pulp and cationic styrene-acrylic emulsion, then fishing for pulp, hot press molding and punching, further coating the emulsified paraffin on the surface and drying; the preparation process is simple and controllable, the loudspeaker cone with uniform quality and stability can be obtained, and the application prospect is wide.
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) pulp: shredding a pulp board, placing the shredded pulp board in a pulping machine, adding water, pulping, diluting obtained pulp with water to obtain the paper pulp with the concentration of 0.1%, and multiplying the oven-dried pulp quality, namely the paper pulp quality by 0.1%; wherein the pulp sheet was purchased from yunqi electro-acoustic technology development ltd, guangzhou city.
(2) Cationic styrene-acrylic emulsion: TF-535 of Huayan chemical Co., Ltd, Yangtze river, with a solid content of 23.1%, a pH value of 5.2, a Zeta potential of 51.8mV, and an average particle size of 72 nm.
(3) Emulsifying paraffin: KSJ of Guangzhou City of Yunqi electro-acoustic science development Limited, pH 4.3.
Example 1
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 10 percent of the mass of the oven-dried pulp, and stirring; continuing adding emulsified paraffin into the pulp after 15min, wherein the adding amount is 2% of the mass of the oven-dried pulp, and uniformly stirring to obtain prefabricated pulp;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
Example 2
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 5% of the mass of the oven-dried pulp, and stirring; continuing to add emulsified paraffin into the pulp after 15min, wherein the addition amount is 5% of the mass of the oven-dried pulp, and uniformly stirring to obtain prefabricated pulp;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
Example 3
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 7.5 percent of the mass of the oven-dried pulp, and stirring; continuing adding emulsified paraffin into the pulp after 15min, wherein the adding amount is 3% of the mass of the oven-dried pulp, and uniformly stirring to obtain prefabricated pulp;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
Example 4
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 10% of the mass of the oven-dried pulp, and uniformly stirring to obtain a prefabricated pulp;
(2) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain a pretreated cone;
(3) and (3) mixing emulsified paraffin with the mass being 4% of that of the oven dry stock with water (the mass ratio of the emulsified paraffin to the water is 1:2), uniformly stirring, spraying the mixture on the surface of the pretreated cone paper obtained in the step (2), and drying at 105 ℃ for 30min to obtain the loudspeaker cone paper.
Example 5
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 5% of the mass of the oven-dried pulp, and uniformly stirring to obtain a prefabricated pulp;
(2) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain a pretreated cone;
(3) and (3) mixing emulsified paraffin with the mass being 1% of that of the oven dry stock with water (the mass ratio of the emulsified paraffin to the water is 1:2), uniformly stirring, spraying the mixture on the surface of the pretreated cone paper obtained in the step (2), and drying at 107 ℃ for 25min to obtain the loudspeaker cone paper.
Example 6
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 15% of the mass of the oven-dried pulp, and stirring; continuing to add emulsified paraffin into the pulp after 15min, wherein the addition amount is 5% of the mass of the oven-dried pulp, and uniformly stirring to obtain prefabricated pulp;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
Example 7
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 3 percent of the mass of the oven-dried pulp, and stirring; continuing adding emulsified paraffin into the pulp after 15min, wherein the adding amount is 1% of the mass of the oven-dried pulp, and uniformly stirring to obtain prefabricated pulp;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
Example 8
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 15% of the mass of the oven-dried pulp, and stirring; continuing adding emulsified paraffin into the pulp after 15min, wherein the adding amount is 1% of the mass of the oven-dried pulp, and uniformly stirring to obtain prefabricated pulp;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
Example 9
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) adding cationic styrene-acrylic emulsion into the paper pulp, wherein the addition amount is 3 percent of the mass of the oven-dried pulp, and stirring; continuing to add emulsified paraffin into the pulp after 15min, wherein the addition amount is 5% of the mass of the oven-dried pulp, and uniformly stirring to obtain prefabricated pulp;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
Example 10
The difference between the embodiment and the embodiment 1 is that the addition amount of the cationic styrene-acrylic emulsion in the step (1) is 18 percent of the mass of the oven-dried pulp.
Example 11
This example is different from example 1 in that the amount of the emulsified paraffin added in step (1) is 8% by mass of the oven-dried slurry.
Example 12
The embodiment provides a loudspeaker cone, and the preparation method comprises the following steps:
(1) carrying out pulp fishing, hot-press forming and punching on the paper pulp to obtain a pretreated cone;
(2) mixing cationic styrene-acrylic emulsion with the mass being 10% of the oven dry pulp, emulsified paraffin with the mass being 2% of the oven dry pulp and water (the mass ratio of the emulsified paraffin to the water is 1:2), uniformly stirring, spraying the mixture on the surface of the pretreated paper cone obtained in the step (1), and drying at 105 ℃ for 30min to obtain the loudspeaker paper cone.
Comparative example 1
This comparative example differs from example 1 in that no emulsified paraffin and no cationic styrene-acrylic emulsion were added in step (1).
Comparative example 2
This comparative example differs from example 1 in that no emulsified paraffin was added in step (1).
Comparative example 3
The comparative example is different from example 1 in that no emulsified paraffin is added in step (1) and the addition amount of the cationic styrene-acrylic emulsion is 15% of the mass of the oven-dried pulp.
Comparative example 4
This comparative example differs from example 1 in that no cationic styrene-acrylic emulsion was added in step (1).
Comparative example 5
The comparative example is different from example 1 in that no cationic styrene-acrylic emulsion is added in step (1), and the addition amount of the emulsified paraffin is 12% of the mass of oven-dried pulp.
Comparative example 6
The comparative example provides a loudspeaker cone, and the preparation method is as follows:
(1) carrying out pulp fishing, hot-press forming and punching on the paper pulp to obtain a pretreated cone;
(2) and (2) mixing emulsified paraffin with the mass being 12% of that of the oven dry stock with water (the mass ratio of the emulsified paraffin to the water is 1:2), uniformly stirring, spraying the mixture on the surface of the pretreated cone paper obtained in the step (1), and drying at 105 ℃ for 30min to obtain the loudspeaker cone paper.
Comparative example 7
The comparative example provides a loudspeaker cone, and the preparation method is as follows:
(1) adding refined rosin PC-8000 into the paper pulp, wherein the adding amount is 2% of the weight of the oven-dried pulp, and stirring; continuously adding aluminum sulfate into the slurry after 15min, wherein the addition amount of the aluminum sulfate is 8% of the mass of the oven-dried slurry, and uniformly stirring to obtain a prefabricated slurry;
(2) and (3) carrying out slurry fishing, hot-press molding and punching on the prefabricated slurry obtained in the step (1) to obtain the loudspeaker cone.
And (3) performance testing:
(1) moisture resistance: the lower the water absorption, the better the moisture resistance. The specific test method comprises the following steps: and (3) placing the cone in an environment with the temperature of 25 ℃ and the humidity of 85% for 14 days, and recording the weight gain percentage of the cone before and after storage, namely the water absorption rate.
(2) Waterproof performance:
IPX5 grade test standard: carrying out a water spraying test; test equipment: the inner diameter of a water spraying opening of the nozzle is 6.3 mm; the test conditions are as follows: the distance between a sample to be detected and a water spray nozzle is 2.5-3 m, and the water flow is 12.5L/min; test time: calculated according to the surface area of the shell of the sample to be tested, each square meter is 1min (excluding the installation area), and the total test time is not less than 3 min.
IPX6 grade test standard: carrying out a strong water spraying test; test equipment: the inner diameter of a water spraying opening of the nozzle is 12.5 mm; the test conditions are as follows: the distance between a sample to be detected and a water spray nozzle is 2.5-3 m, and the water flow is 100L/min; test time: calculated according to the surface area of the shell of the sample to be tested, the total test time is not less than 3min (excluding the installation area) per square meter for 1 min.
IPX7 grade test standard: short-time soaking test; test equipment and test conditions: the size of the water immersion tank is such that after a sample to be detected is placed in the water immersion tank, the distance from the bottom of the sample to the water surface is at least 1m, and the distance from the top of the sample to the water surface is at least 0.15 m; test time: and (3) 30 min.
The moisture resistance and the water resistance of the speaker cones provided in examples 1 to 12 and comparative examples 1 to 7 of the present invention were tested according to the above methods, and the specific data are shown in table 1.
TABLE 1
As can be seen from the data in table 1, compared with the speaker cone disclosed in the prior art in comparative example 7, the speaker cones provided in the embodiments 1 to 6 of the present invention have excellent waterproof property and moisture resistance, the waterproof property can reach IPX7 level, the water absorption rate is lower than 4.72%, even as low as 3.35%, and the application requirements of the speaker in harsh environments such as underwater or humid outdoor can be fully satisfied.
If the mass of the cationic styrene-acrylic emulsion in the preparation raw material of the loudspeaker cone is more than 15% of the mass of the oven dry stock (example 10) and the mass of the emulsified paraffin is more than 5% of the mass of the oven dry stock (example 11), the operability in the production of the cone is adversely affected, and the production efficiency is reduced. If the mass ratio of the cationic styrene-acrylic emulsion to the emulsified paraffin is beyond the preferable range (1-7): 1 (examples 8 and 9) of the invention, the waterproof and moistureproof performance of the loudspeaker cone is reduced.
In addition, in the speaker cone provided by the invention, the emulsified paraffin can be added in the slurry fishing stage (examples 1-3), or can be sprayed on the cone after punching (examples 4 and 5), and the technical effect of water resistance and moisture resistance can be achieved only by adding the cationic styrene-acrylic emulsion in the slurry fishing stage. If the cationic benzo emulsion is sprayed onto the cone after die cutting (example 12), the absorption of the cone will increase and the moisture resistance will decrease.
If the speaker cone is not subjected to any waterproof and moistureproof treatment in the preparation process (comparative example 1) and only a single cationic styrene-acrylic emulsion or emulsified paraffin is added (comparative examples 2-6), the cone with waterproof and moistureproof performances cannot be obtained, the waterproof and moistureproof performances of the speaker cone are proved to be realized based on the synergistic compounding of the cationic styrene-acrylic emulsion and the emulsified paraffin, and the technical effects of the waterproof and moistureproof the speaker cone cannot be achieved by singly adding any one or even increasing the dosage of the cationic styrene-acrylic emulsion and the emulsified paraffin.
The applicant states that the present invention is described by the above embodiments, 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 implement the speaker cone of the present invention. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (19)
1. The loudspeaker cone is characterized in that raw materials for preparing the loudspeaker cone comprise paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin; the mass of the cationic styrene-acrylic emulsion is 4-15% of that of the oven dry stock, and the mass ratio of the cationic styrene-acrylic emulsion to the emulsified paraffin is (1-7): 1.
2. The loudspeaker cone of claim 1, wherein the cationic styrene-acrylic emulsion is 5-15% of oven dry pulp by mass.
3. The loudspeaker cone of claim 1, wherein the cationic styrene-acrylic emulsion has a pH of 4.0-6.0.
4. The loudspeaker cone of claim 1, wherein the cationic styrene-acrylic emulsion has latex particles with a particle size of 50-100 nm.
5. The loudspeaker cone of claim 1, wherein the cationic styrene-acrylic emulsion has a Zeta potential of 40-60 mV.
6. The loudspeaker cone of claim 1, wherein the mass of the emulsified paraffin is 1-5% of the mass of the oven dried pulp.
7. The loudspeaker cone of claim 1, wherein the emulsified paraffin has a pH of 3.0 to 5.0.
8. A method for preparing a loudspeaker cone as claimed in any one of claims 1 to 7, wherein the loudspeaker cone is prepared by the following preparation method I or preparation method II:
the preparation method I comprises the following steps: mixing and dispersing paper pulp, cationic styrene-acrylic emulsion and emulsified paraffin, and then carrying out pulp fishing, hot-press molding and punching to obtain the loudspeaker cone;
the preparation method II comprises the following steps: mixing and dispersing paper pulp and cationic styrene-acrylic emulsion, and then carrying out pulp fishing, hot-press molding and punching to obtain a pretreated cone; and coating emulsified paraffin on the surface of the pretreated cone paper, and drying to obtain the loudspeaker cone paper.
9. The production method according to claim 8, wherein the pulp in both production method I and production method II is pulp obtained by beating.
10. The method of manufacturing according to claim 9, wherein the beating is performed by: and (3) shredding the pulp board, placing the shredded pulp board in a pulping machine, adding water, pulping, and diluting the obtained pulp with water to obtain the paper pulp.
11. The process according to claim 8, wherein the mixing and dispersing are carried out by the processes of production I and production II under stirring.
12. The method of claim 8, wherein the coating is performed by spray coating.
13. The method according to claim 8, wherein the drying temperature in the method II is 100 to 110 ℃.
14. The method according to claim 13, wherein the drying temperature in the method II is 103 to 107 ℃.
15. The method according to claim 8, wherein the drying time in method II is 10 to 50 min.
16. The method according to claim 15, wherein the drying time in method II is 25 to 35 min.
17. The preparation method according to claim 8, wherein the preparation method I is specifically: shredding a pulp board, placing the shredded pulp board in a pulping machine, adding water, and pulping to obtain pulp, and diluting the obtained pulp with water to obtain the paper pulp; and adding the cationic styrene-acrylic emulsion and the emulsified paraffin into the paper pulp, stirring and dispersing, and then carrying out pulp fishing, hot press molding and punching to obtain the loudspeaker cone.
18. The preparation method according to claim 8, wherein the preparation method II is specifically: shredding a pulp board, placing the shredded pulp board in a pulping machine, adding water, and pulping to obtain pulp, and diluting the obtained pulp with water to obtain the paper pulp; adding cationic styrene-acrylic emulsion into paper pulp, stirring and dispersing, and then carrying out pulp fishing, hot-press molding and punching to obtain a pretreated paper basin; and spraying emulsified paraffin on the surface of the pretreated cone paper, and drying at 100-110 ℃ for 10-50 min to obtain the loudspeaker cone paper.
19. A loudspeaker, characterized in that the loudspeaker comprises a loudspeaker cone according to any one of claims 1 to 7.
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| CN111510845A (en) * | 2020-04-08 | 2020-08-07 | 国光电器股份有限公司 | Paper cone for loudspeaker and preparation method and application thereof |
| CN112609509B (en) * | 2020-12-08 | 2022-11-01 | 国光电器股份有限公司 | Waterproof air-proof paper cone and preparation method and application thereof |
| CN113079451B (en) * | 2021-03-29 | 2023-05-05 | 国光电器股份有限公司 | Foaming cone for loudspeaker and preparation method and application thereof |
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