CN111572072A - Silica gel vibrating diaphragm adhesive tape and preparation method thereof - Google Patents
Silica gel vibrating diaphragm adhesive tape and preparation method thereof Download PDFInfo
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- CN111572072A CN111572072A CN202010305387.7A CN202010305387A CN111572072A CN 111572072 A CN111572072 A CN 111572072A CN 202010305387 A CN202010305387 A CN 202010305387A CN 111572072 A CN111572072 A CN 111572072A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2483/00—Presence of polysiloxane
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- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
The invention relates to the technical field of vibrating diaphragms, in particular to a silica gel vibrating diaphragm adhesive tape and a preparation method of the silica gel vibrating diaphragm adhesive tape, wherein the preparation method of the silica gel vibrating diaphragm adhesive tape comprises the steps of silicon material preparation, mixing and gluing, blow-pressing die assembly and rolling sizing; the die spotting machine used in the blow-compression die spotting comprises a frame, a die, a roller film column and a controller; the production mode of the silica gel vibrating diaphragm injection molding limits the film thickness of the silica gel vibrating diaphragm, and the silica gel vibrating diaphragm produced by injection molding is interfered by the molding process of the mold cavity, so that the silica gel vibrating diaphragm has internal stress which is not completely eliminated, and the performance effect of the silica gel vibrating diaphragm in use is reduced; therefore, the moulding process of the vibrating diaphragm is carried out on the blown and stretched silicon rubber film in sequence by the pressing die arranged on the die spotting machine in cooperation with the bulges on the roller film column, the shaping thickness of the silicon rubber vibrating diaphragm is reduced, and meanwhile, the blown cylindrical silicon rubber film is divided into four equal parts by the ribs, so that the production of the silicon rubber vibrating diaphragm is increased, and the preparation method of the silicon rubber vibrating diaphragm adhesive tape is improved.
Description
Technical Field
The invention relates to the technical field of diaphragms, in particular to a silica gel diaphragm adhesive tape and a preparation method of the silica gel diaphragm adhesive tape.
Background
The diaphragm plays an important role in the sound reproduction performance of the micro-speaker, and determines the quality of the conversion from force to sound of the speaker, the bearing power of the speaker and the quality of the reproduced sound quality; the diaphragm material is required to have small density, good rigidity and moderate damping; the smaller the density of the vibrating diaphragm is, the lighter the mass is, and the fastest the vibrating speed is; the stiffness of which mainly determines the split vibration frequencies that may occur for a loudspeaker; the ideal vibration of the diaphragm is: when the voice coil is started, the vibrating diaphragm is started immediately, when no audio current flows through the voice coil and stops moving, the vibrating diaphragm is stopped immediately, and the internal damping of the front vibrating diaphragm and the rear vibrating diaphragm is proper; for a description of the diaphragm action in an acoustic device, reference is made to: wuzonghan, analysis of the influence of the material characteristics of the diaphragm system on the related characteristics of the microphone [ J ], electro-acoustic technology, 2009(No.10) 17-19.
The thickness of silica gel vibrating diaphragm preparation is related to its effect in acoustic instrument, and the silica gel vibrating diaphragm thickness that the mode of traditional moulding plastics was made is difficult to reach below 50 mu m, has restricted the result of use of silica gel vibrating diaphragm, and at the in-process of the preparation silica gel vibrating diaphragm of moulding plastics simultaneously, the performance parameter of production vibrating diaphragm is difficult to stabilize in the die cavity, and effectual production rate receives the influence equally.
Some technical schemes related to a silica gel diaphragm adhesive tape and a preparation method of the silica gel diaphragm adhesive tape also appear in the prior art, and for example, a chinese patent with application number 2017108902017 discloses a preparation method of a silica gel diaphragm adhesive tape and a silica gel diaphragm adhesive tape, and the preparation method includes the following steps: sequentially adding methyl vinyl silicone rubber, fumed silica, an additive and a cross-linking agent into a stirring barrel, and stirring for 30-60 min to form silica gel glue; pouring the silica gel glue into a glue storage tank, and vacuumizing to eliminate bubbles; introducing the silica gel glue for eliminating bubbles into a coating head, and uniformly coating the silica gel glue on the surface of the first functional film layer to form an adhesive layer; the adhesive layer is attached to the second functional film layer through a composite compression roller to form the silica gel vibrating diaphragm adhesive tape; rolling the silica gel diaphragm adhesive tape into a roll shape by a rolling shaft; compared with the existing silica gel diaphragm adhesive tape, the silica gel diaphragm adhesive tape in the technical scheme has the advantages that the acoustic damping performance is improved, the total harmonic distortion is reduced by 8%, and the hearing yield reaches 98%; but in this solution.
In view of this, in order to overcome the above technical problems, the present company has designed and developed a silica gel diaphragm tape and a silica gel diaphragm tape preparation method, and a special preparation apparatus and method are adopted to solve the above technical problems.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a silica gel vibrating diaphragm adhesive tape and a preparation method of the silica gel vibrating diaphragm adhesive tape.
The invention relates to a preparation method of a silica gel vibrating diaphragm adhesive tape, which comprises the following steps: the method comprises the following steps:
s1, silicon material preparation: vinyl silicone resin is selected as a main material of silica gel, the viscosity of the vinyl silicone resin is 10000mPa & s, the mass fraction of vinyl is 1-3%, hydrogen-containing vinyl silicone oil, the mass fraction of active hydrogen is more than 1%, the viscosity of the hydrogen-containing vinyl silicone oil is more than 15000mPa & s, an inhibitor and a tackifier are added, and finally a reaction catalyst is added;
s2, mixing and forming glue: adding the raw materials selected and matched in the step S1 into a stirring kettle, controlling the temperature in the stirring kettle within 280 ℃, maintaining the pressure in the stirring kettle at 1.5-1.8bar, circularly changing the temperature in the reaction kettle within 220 ℃ to 280 ℃ in the operation process of the stirring kettle, changing the temperature at the speed of 2 ℃/min, and operating for 2-3h to obtain qualified mixed silica gel; the temperature change process of the internal circulation of the stirring kettle promotes the uniform mixing effect of the mixed materials, and the uniform temperature change is beneficial to eliminating the internal stress among various mixtures in the mixed rubber, so that the relatively stable state of the mixed rubber is maintained;
s3, blow-compression mold assembly: adding the silica gel mixed in the step S2 into a hot melt machine, blowing the silica gel in a molten state into a die spotting machine through a die head on the hot melt machine to expand, controlling the film forming thickness of the silica gel within 40 mu m by utilizing a blow molding stretching mode, simultaneously dividing a cylindrical silica gel film formed by blow molding into four equal parts by a rib of the die head, respectively corresponding to four side surfaces of the die spotting machine, pressing the cylindrical silica gel film into a flat film surface through a roll shaft, and preliminarily forming the shape of the vibrating diaphragm adhesive tape by the pressed silica gel film on the die spotting machine under the action of a pressing die; the method has the advantages that the method of blow molding is used for replacing injection molding of the silica gel vibrating diaphragm to prepare a vibrating diaphragm product with thinner thickness, so that a better performance effect of the silica gel vibrating diaphragm is obtained, the cylindrical silica gel diaphragm obtained by blow molding is cut by the mold closing machine, the interference of the blow molding film forming process on the vibrating diaphragm forming is avoided, and meanwhile, the production efficiency of the silica gel vibrating diaphragm is improved;
s4, rolling and shaping: conveying the vibrating diaphragm adhesive tape preliminarily formed in the step S3 to a collecting tank, fitting the bulge on the surface of the roller diaphragm column on the collecting tank with the shape of the silica gel vibrating diaphragm, and acting with the vibrating diaphragm part on the silica gel diaphragm to finally shape the silica gel vibrating diaphragm; the silica gel vibrating diaphragm is shaped through the bulges on the roller diaphragm column, so that the vibrating diaphragm shape in the processing deformation of the silica gel diaphragm is ensured;
the die spotting machine in the S3 comprises a frame, a die, a roller film column and a controller; the bottom of the rack is provided with a hot melting machine, and the hot melting machine is provided with a frustum-shaped die head; convex ribs are arranged on four conical edges of the die head, and sharp edges on the ribs extend along the conical edges of the die head; an inverted prismatic table is arranged above the die head, air ports are formed in four edges of the top end of the prismatic table, and an air pipe is arranged in the middle of the prismatic table; the upper parts of the air ports of the prismatic tables are respectively provided with corresponding pressing dies, the pressing dies are installed on the rack, and the silica gel film is pressed into the shape of the vibrating diaphragm through the pressing dies; an air pump communicated to the air pipe is arranged at the top end of the rack, cylinder shafts which are rotatably arranged are arranged on four sides of the top end of the rack, and collecting tanks are arranged on four sides of the rack corresponding to the cylinder shafts; a roll film column is arranged on the collecting tank, and a bulge corresponding to the shape of the vibrating diaphragm is arranged on the roll film column; the controller controls the operation of the air pump and the roller film column; the silica gel vibrating diaphragm has the advantages that the silica gel vibrating diaphragm needs to accurately transmit an acoustic signal in acoustic application, the performance parameters of the silica gel vibrating diaphragm have higher requirements, the thickness of a film layer of the silica gel vibrating diaphragm is limited due to the production mode that the silica gel vibrating diaphragm is usually injected into a mold cavity, and meanwhile, the silica gel vibrating diaphragm produced by injection molding is interfered by the molding process of the mold cavity, so that the silica gel vibrating diaphragm has internal stress which is not completely eliminated, and the performance effect of the silica gel vibrating diaphragm in use is further reduced; therefore, the silicon gel film is produced in a blow molding mode through the arranged die spotting press, the blown silicon gel film is guided to four sides through the air opening arranged on the prismatic table, the blown silicon gel film is respectively cut into single films by matching with the prismatic bars, preliminary diaphragm molding is carried out on the films through the pressing die on the die spotting press, the blown films are divided into four parts before diaphragm molding, finally the films are taken out through the traction action of the roller film columns on the films, and the diaphragms on the films are shaped through the bulges on the roller film columns; according to the invention, the moulding process of the vibrating diaphragm is carried out on the blown and stretched silicon rubber film in sequence by utilizing the pressing die arranged on the die spotting machine and matching with the bulge on the roller film column, so that the shaping thickness of the silicon rubber vibrating diaphragm is reduced, and meanwhile, the blown cylindrical silicon rubber film is divided into four equal parts by utilizing the ribs, so that the production of the silicon rubber vibrating diaphragm is increased, and the preparation method of the silicon rubber vibrating diaphragm adhesive tape is improved.
Preferably, the top end of each rib is provided with a supporting ball, a support block is arranged on the rack corresponding to the supporting ball, and the supporting ball is supported on the support block; a roll shaft is arranged between the top ends of the ribs, one end of the roll shaft penetrates through the supporting ball to extend out, a roll seat is arranged at the other end of the roll shaft, and the roll seat is fixed on the supporting ball; the ribs divide the blown silicon film into four parts, and then press a vibrating diaphragm on the divided silicon film through a pressing die, wherein the blown silicon film needs to produce silicon vibrating diaphragms with different specifications, and the ribs also need to correspondingly adjust the angle of the sharp edges of the ribs for dividing the silicon film; through setting up on the tray of frame at the supporting ball frame on rib top, when switching the silica gel vibrating diaphragm of producing different specifications, directly change the rib on the tray, reached the specification that the clapper die spotting press switches production silica gel vibrating diaphragm then, the roller that sets up between the rib top assists the silica gel diaphragm and guides to the moulding-die of clapper die spotting press on, has stabilized the clapper die spotting press and has carried out the suppression process of silica gel vibrating diaphragm to the production quality of silica gel vibrating diaphragm sticky tape has been maintained.
Preferably, a transmission wheel shell is arranged on the end face of the roll shaft penetrating through the supporting ball, and a servo motor is arranged on the position, corresponding to the transmission wheel shell, of the rack; the servo motor is in transmission connection with the roll shaft and is controlled and driven by the controller; the roller shaft guides the divided diaphragm into the pressing die, and because the diaphragm is stretched under the traction action of the roller diaphragm columns, different traction forces between the roller diaphragm columns cause different stretching degrees to the diaphragm, so that the production effect of the silica gel diaphragm on the pressing die is damaged; through setting up the transmission wheel shell on the roller, the roller is under servo motor's drive, and the initiative is pulled out the diaphragm of cutting apart, has avoided the traction force difference between the roller membrane post to the interference that the silica gel diaphragm of production led to the fact in the moulding-die, utilizes the accurate drive of controller to servo motor simultaneously, maintains the surface tension who cuts apart each diaphragm in back to the silica gel diaphragm sticky tape quality of production has been promoted.
Preferably, a spoiler is arranged at a position, close to the air inlet on the prismoid, of the rib, a shaft column is arranged at the bottom of the spoiler, and the shaft column is vertically and rotatably installed on the rib; the spoiler swings left and right under the action of blow molding; the blown silica gel film is divided into four parts under the action of the ribs, and meanwhile, air flows blown out from the top end of the prismatic table are diffused along four directions, and the air flows blown out from air ports on two adjacent sides of the prismatic table are interfered with each other, so that the uniform thickness of the blown silica gel film is influenced, and the quality of a diaphragm pressed by the diaphragm is reduced; through setting up the spoiler on the rib, separate the air current in adjacent wind gap on the terrace with edge, swing with the jack-post through the spoiler, adjust the air current that adjacent wind gap blew out on the terrace with edge, balanced the blowing effect to the pellosil piece of cutting, and then stabilized the pellosil piece thickness that the blowing formed, promoted the stability of silica gel vibrating diaphragm sticky tape quality.
Preferably, the upper part of the sharp edge on the ridge is provided with a cutting edge, the cutting edge of the cutting edge is parallel to the sharp edge of the ridge, and the cutting edge is provided with a convex cutting edge; in the process of cutting the silica gel membrane by the ribs, the cutting position of the silica gel membrane cannot be stabilized only by the sharp edges of the ribs, and the difference of the cutting positions of the silica gel membrane can also interfere with the operation effect of the pressing die and destroy the consistency of the membrane pressed into the silica gel vibrating membrane; through setting up the cutting edge on the sharp arris of edges and strips, ensure that the diaphragm of cutting apart is in the fixed position on the pellosil that the blowing was gone out to utilize convex sword point on the cutting edge to prevent that the pellosil under the situation of swelling is not cut apart, and then kept the stable of going on of silica gel vibrating diaphragm sticky tape production.
Preferably, an air cylinder which is directionally telescopic is arranged between the pressing dies, and a push block is arranged in the pressing die direction corresponding to the air cylinder; the pressing die is connected to the inflator through the pushing block, the back of the pressing die is provided with a shaft rod, and the shaft rod is rotatably installed on the rack; the pressing die is subjected to angle adjustment through a shaft rod; when the pressing die presses the diaphragm, the movement of the diaphragm stops, the diaphragm is continuously pulled to the direction of the roller diaphragm column after the pressing is finished, the circular opening and closing of the pressing die are required to press the silica gel diaphragm, and the rigidly driven pressing die cannot cope with the slight change of the position between the diaphragm and the pressing die, so that the thickness of the pressed silica gel diaphragm is in the fluctuation range; through setting up directional inflator drive between the press mold, the cooperation is rotated and is installed the axostylus axostyle in the frame for the pressurized system process of silica gel membrane is in stable within range in the press mold, has reduced the thickness variation range of the silica gel vibrating diaphragm of production, thereby has ensured the stable quality of silica gel vibrating diaphragm sticky tape product.
The silica gel diaphragm adhesive tape comprises 55 parts of vinyl silicone resin, 35 parts of hydrogen-containing vinyl silicone oil, 3 parts of a catalyst, 1 part of an inhibitor and 2 parts of a tackifier, wherein the catalyst comprises dimethyl polysiloxane and polyarylester which are used immediately after being prepared by field reaction, and is mixed to form a raw material for preparing the silica gel diaphragm; the water content of the polyarylate in the catalyst needs to be kept within 0.02% in use, otherwise, the action effect of the catalyst can be damaged, and the catalyst components are synthesized on site in the preparation of the raw materials, so that the loss of the catalytic effect in the raw materials is avoided, and the preparation of the silica gel diaphragm adhesive tape is ensured.
The invention has the following beneficial effects:
1. according to the invention, the moulding process of the vibrating diaphragm is carried out on the blown and stretched silicon rubber diaphragm in sequence by the pressing die arranged on the die spotting machine in cooperation with the bulge on the roller film column, so that the preparation method of the silicon rubber vibrating diaphragm adhesive tape is improved; the roller shafts arranged between the tops of the ribs assist the silica gel membrane to be guided to a pressing die of the die spotting machine; the roller shaft is arranged to accurately drive the servo motor by using the controller, so that the quality of the produced silica gel vibrating diaphragm adhesive tape is improved.
2. According to the invention, the air flow blown out from the adjacent air ports is adjusted through the spoilers arranged on the ribs, so that the thickness of the silicone membrane formed by blow molding is stabilized; the cutting edges are arranged on the sharp edges of the edge strips to ensure the fixed positions of the division membranes; the air cylinder arranged between the press films is matched with the shaft rod on the rack, so that the pressing process of the silica gel film in the press films is in a stable range.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a flow chart of a method for preparing a silica gel diaphragm adhesive tape according to the present invention;
FIG. 2 is a perspective view of the die spotting machine of the present invention;
FIG. 3 is a perspective view of a part of the clamping mechanism of the present invention;
FIG. 4 is a perspective view of a part of the clamping mechanism of the present invention;
FIG. 5 is a perspective view of a die assembly of the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 3 at A;
FIG. 7 is a partial enlarged view at B in FIG. 4;
in the figure: the device comprises a frame 1, an air pump 11, a cylinder shaft 12, a servo motor 13, a pressing die 2, an air cylinder 21, a push block 22, a shaft rod 23, a roller film column 3, a bulge 31, a hot melting machine 4, a die head 41, ribs 42, a supporting ball 421, a supporting block 422, a roller shaft 43, a roller seat 431, a transmission wheel shell 432, a spoiler 44, a shaft column 441, a cutting edge 45, a cutting edge 451, a frustum 5, an air port 51, an air pipe 52 and a collecting tank 6.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 7, a method for preparing a silica gel diaphragm tape according to the present invention comprises: the method comprises the following steps:
s1, silicon material preparation: vinyl silicone resin is selected as a main material of silica gel, the viscosity of the vinyl silicone resin is 10000mPa & s, the mass fraction of vinyl is 1-3%, hydrogen-containing vinyl silicone oil, the mass fraction of active hydrogen is more than 1%, the viscosity of the hydrogen-containing vinyl silicone oil is more than 15000mPa & s, an inhibitor and a tackifier are added, and finally a reaction catalyst is added;
s2, mixing and forming glue: adding the raw materials selected and matched in the step S1 into a stirring kettle, controlling the temperature in the stirring kettle within 280 ℃, maintaining the pressure in the stirring kettle at 1.5-1.8bar, circularly changing the temperature in the reaction kettle within 220 ℃ to 280 ℃ in the operation process of the stirring kettle, changing the temperature at the speed of 2 ℃/min, and operating for 2-3h to obtain qualified mixed silica gel; the temperature change process of the internal circulation of the stirring kettle promotes the uniform mixing effect of the mixed materials, and the uniform temperature change is beneficial to eliminating the internal stress among various mixtures in the mixed rubber, so that the relatively stable state of the mixed rubber is maintained;
s3, blow-compression mold assembly: adding the silica gel mixed in the step S2 into a hot melt machine 4, blowing the silica gel in a molten state into a die spotting machine through a die head 41 on the hot melt machine 4 to expand, controlling the film forming thickness of the silica gel within 40 mu m by using a blow molding stretching mode, simultaneously dividing a cylindrical silica gel film formed by blow molding into four equal parts by ribs of the die head 41, respectively corresponding to four side surfaces of the die spotting machine, pressing the cylindrical silica gel film into a flat film surface through a roll shaft 43, and preliminarily forming the shape of a vibrating diaphragm adhesive tape by the pressed silica gel film on the die spotting machine under the action of a pressing die 2; the method has the advantages that the method of blow molding is used for replacing injection molding of the silica gel vibrating diaphragm to prepare a vibrating diaphragm product with thinner thickness, so that a better performance effect of the silica gel vibrating diaphragm is obtained, the cylindrical silica gel diaphragm obtained by blow molding is cut by the mold closing machine, the interference of the blow molding film forming process on the vibrating diaphragm forming is avoided, and meanwhile, the production efficiency of the silica gel vibrating diaphragm is improved;
s4, rolling and shaping: the vibrating diaphragm adhesive tape preliminarily formed in the step S3 is transmitted to the collecting tank 6, the bulge 31 on the surface of the roller diaphragm column 3 on the collecting tank 6 is attached to the shape of the silica gel vibrating diaphragm and acts with the vibrating diaphragm part on the silica gel diaphragm, and the silica gel vibrating diaphragm is finally shaped; the silica gel vibrating diaphragm is shaped through the bulge 31 on the roller diaphragm column 3, so that the vibrating diaphragm shape in the processing deformation of the silica gel diaphragm is ensured;
the die spotting machine described in S3 comprises a frame 1, a die 2, a roller film column 3 and a controller; the bottom of the frame 1 is provided with a hot melting machine 4, and the hot melting machine 4 is provided with a frustum-shaped die head 41; four conical edges of the die head 41 are provided with convex ribs 42, and sharp edges on the ribs 42 extend along the conical edges of the die head 41; an inverted frustum pyramid 5 is arranged above the die head 41, air ports 51 are arranged on four edges of the top end of the frustum pyramid 5, and an air pipe 52 is arranged in the middle of the frustum pyramid 5; the corresponding pressing dies 2 are respectively arranged above the air ports 51 of the prismatic table 5, the pressing dies 2 are installed on the rack 1, and the silica gel film is pressed into the shape of the vibrating diaphragm through the pressing dies 2; an air pump 11 communicated to an air pipe 52 is arranged at the top end of the rack 1, rotatably mounted cylinder shafts 12 are arranged on four sides of the top end of the rack 1, and collecting tanks 6 are arranged on four sides of the rack 1 corresponding to the cylinder shafts 12; the collecting tank 6 is provided with a roller film column 3, and the roller film column 3 is provided with a bulge 31 corresponding to the shape of the vibrating diaphragm; the controller controls the operation of the air pump 11 and the film rolling column 3; the silica gel vibrating diaphragm has the advantages that the silica gel vibrating diaphragm needs to accurately transmit an acoustic signal in acoustic application, the performance parameters of the silica gel vibrating diaphragm have higher requirements, the thickness of a film layer of the silica gel vibrating diaphragm is limited due to the production mode that the silica gel vibrating diaphragm is usually injected into a mold cavity, and meanwhile, the silica gel vibrating diaphragm produced by injection molding is interfered by the molding process of the mold cavity, so that the silica gel vibrating diaphragm has internal stress which is not completely eliminated, and the performance effect of the silica gel vibrating diaphragm in use is further reduced; therefore, the silicon gel film is produced by the arranged die spotting press in a blow molding mode, the blown silicon gel film is guided to four sides by the air opening 51 arranged on the prismatic table 5, the blown silicon gel film is respectively cut into single films by matching with the prismatic strip 42, the films are subjected to preliminary diaphragm molding by the pressing die 2 on the die spotting press, the blown films are divided into four parts before the diaphragm molding, finally the films are taken out by the traction action of the roller film column 3 on the films, and the diaphragms on the films are shaped by the bulges 31 on the roller film column 3; according to the invention, the moulding process of the vibrating diaphragm is carried out on the blown and stretched silicon film successively by utilizing the pressing die 2 arranged on the die spotting machine and matching with the bulge 31 on the roll film column 3, so that the shaping thickness of the silicon film is reduced, and meanwhile, the prism strips 42 are utilized to divide the blown cylindrical silicon film into four equal parts, so that the production of the silicon film is increased, and the preparation method of the silicon film adhesive tape is improved.
In one embodiment of the present invention, a supporting ball 421 is disposed at the top end of the rib 42, a supporting block 422 is disposed on the frame 1 corresponding to the supporting ball 421, and the supporting ball 421 is supported on the supporting block 422; a roller shaft 43 is arranged between the top ends of the ribs 42, one end of the roller shaft 43 penetrates through the supporting ball 421 to extend out, a roller seat 431 is arranged at the other end of the roller shaft 43, and the roller seat 431 is fixed on the supporting ball 421; the ribs 42 divide the blown silicone film into four parts, and then the vibration diaphragms are pressed on the divided silicone film through the pressing die 2, because the blown silicone film needs to produce the silicone vibration diaphragms with different specifications, the ribs 42 also need to correspondingly adjust the angle of the sharp edges of the ribs for dividing the silicone film; on the saddle 422 of frame 1 through the support ball 421 frame that sets up on rib 42 top, when switching the silica gel vibrating diaphragm of producing different specifications, directly change rib 42 on saddle 422, reached the specification that the clapper die spotting press switches production silica gel vibrating diaphragm then, the supplementary silica gel diaphragm of roller 43 that sets up between rib 42 top guides to the moulding-die 2 of clapper die spotting press on, the clapper die spotting press has been stabilized and has carried out the suppression process of silica gel vibrating diaphragm to the diaphragm, thereby the production quality of silica gel vibrating diaphragm sticky tape has been maintained.
In one embodiment of the present invention, a driving wheel housing 432 is provided on an end surface of the roller shaft 43 penetrating through the supporting ball 421, and a servo motor 13 is provided at a position of the frame 1 corresponding to the driving wheel housing 432; the servo motor 13 is in transmission connection with the roller shaft 43, and the servo motor 13 is controlled and driven by a controller; the roller shaft 43 guides the divided membranes into the pressing die 2, and because the membranes are stretched under the traction action of the membrane rolling columns 3, different traction forces between the membrane rolling columns 3 cause different stretching degrees to the membranes, so that the production effect of the silica gel vibrating diaphragm on the pressing die 2 is damaged; through setting up transmission wheel shell 432 on roller 43, roller 43 draws out the diaphragm that cuts apart in the initiative under servo motor 13's drive, has avoided the interference that the pulling force difference between the roller diaphragm post 3 caused the silicon membrane piece of production in moulding-die 2, utilizes the accurate drive of controller to servo motor 13 simultaneously, maintains the surface tension of cutting apart each diaphragm to the silicon membrane sticky tape quality of production has been promoted.
As an embodiment of the present invention, a spoiler 44 is disposed at a position of the rib 42 close to the air inlet 51 of the prism table 5, a shaft post 441 is disposed at the bottom of the spoiler 44, and the shaft post 441 is vertically and rotatably mounted on the rib 42; the spoiler 44 swings left and right under the action of blow molding; the blown silica gel film is divided into four parts under the action of the ribs 42, meanwhile, air flows blown out from the top end of the frustum pyramid 5 are diffused along four directions, and the air flows blown out from the air openings 51 at two adjacent sides of the frustum pyramid 5 interfere with each other, so that the uniform thickness of the blown silica gel film is influenced, and the quality of a diaphragm pressed by the diaphragm is reduced; through the spoiler 44 that sets up on the rib 42, separate the air current of adjacent wind gap 51 on the terrace with edge 5, swing with the jack-post 441 through the spoiler 44, adjust the air current that adjacent wind gap 51 blew out on the terrace with edge 5, balanced the blowing effect to the pellosil piece of segmentation, and then stabilized the pellosil piece thickness that the blowing formed, promoted the stability of pellosil piece sticky tape quality.
As an embodiment of the present invention, the upper portion of the sharp edge of the rib 42 is provided with a blade 45, the cutting edge of the blade 45 is parallel to the sharp edge of the rib 42, and the cutting edge is provided with a convex blade tip 451; in the process of dividing the silicone membrane by the ribs 42, the dividing position of the silicone membrane cannot be stabilized only by the sharp edges of the ribs 42, and the difference of the dividing positions of the silicone membrane can also interfere with the operation effect of the pressing die 2, so that the consistency of pressing the membrane into the silicone vibrating membrane is damaged; the cutting edges 45 arranged on the sharp edges of the ribs 42 ensure that the split membranes are in fixed positions on the blown silicone membrane, and the protruding cutting edges 451 on the cutting edges 45 prevent the silicone membrane under the bulging condition from being not split, so that the stable production of the silicone vibrating membrane adhesive tape is maintained.
As an embodiment of the invention, an air cylinder 21 which can directionally stretch and contract is arranged between the pressing dies 2, and a push block 22 is arranged on the air cylinder 21 corresponding to the direction of the pressing die 2; the pressing die 2 is connected to an air cylinder 21 through a push block 22, the back of the pressing die 2 is provided with a shaft rod 23, and the shaft rod 23 is rotatably arranged on the rack 1; the pressing die 2 is subjected to angle adjustment through a shaft rod 23; when the pressing die 2 presses the diaphragm, the movement of the diaphragm stops, the diaphragm is continuously pulled to the direction of the film rolling column 3 after the pressing is finished, the pressing die 2 needs to be opened and closed circularly to press the silica gel diaphragm, and the rigidly driven pressing die 2 cannot cope with slight change of the position between the diaphragm and the pressing die 2, so that the thickness of the pressed silica gel diaphragm is in a fluctuation range; through setting up directional inflator 21 drive between the press mold, the cooperation rotates the axostylus axostyle 23 of installing in frame 1 for the pressurized process of silica gel membrane is in stable within range in the moulding-die 2, has reduced the thickness variation range of the silica gel vibrating diaphragm of production, thereby has ensured the stable quality of silica gel vibrating diaphragm sticky tape product.
The silica gel diaphragm adhesive tape comprises 55 parts of vinyl silicone resin, 35 parts of hydrogen-containing vinyl silicone oil, 3 parts of a catalyst, 1 part of an inhibitor and 2 parts of a tackifier, wherein the catalyst comprises dimethyl polysiloxane and polyarylester which are used immediately after being prepared by field reaction, and is mixed to form a raw material for preparing the silica gel diaphragm; the water content of the polyarylate in the catalyst needs to be kept within 0.02% in use, otherwise, the action effect of the catalyst can be damaged, and the catalyst components are synthesized on site in the preparation of the raw materials, so that the loss of the catalytic effect in the raw materials is avoided, and the preparation of the silica gel diaphragm adhesive tape is ensured.
When the silica gel vibrating diaphragm works, an acoustic signal needs to be accurately transmitted in acoustic application, and the silica gel vibrating diaphragm has higher requirements on performance parameters; producing a silicon film in a blow molding mode through an arranged mold closing machine, guiding the blown silicon film into four sides through an air opening 51 arranged on a prismatic table 5, respectively cutting the blown silicon film into single membranes by matching with a prismatic strip 42, carrying out preliminary membrane molding on the membranes through a pressing die 2 on the mold closing machine, dividing the blown membranes into four parts before the membrane molding, finally taking the membranes out through the traction action of a roller membrane column 3 on the membranes, and shaping the membranes on the membranes through bulges 31 on the roller membrane column 3; the supporting balls 421 arranged at the top ends of the ribs 42 are supported on the support blocks 422 of the frame 1, when silica gel diaphragms with different specifications are switched and produced, the ribs 42 on the support blocks 422 are directly replaced, so that the specifications of the silica gel diaphragms switched and produced by the die spotting machine are reached, the roll shafts 43 arranged between the top ends of the ribs 42 assist the silica gel diaphragms to be guided to the pressing dies 2 of the die spotting machine, and the pressing process of the silica gel diaphragms by the die spotting machine is stabilized; the transmission wheel shell 432 is arranged on the roller shaft 43, the roller shaft 43 actively pulls out the divided diaphragms under the driving of the servo motor 13, the interference of the traction force difference between the roller diaphragm columns 3 on the silica gel diaphragms produced in the pressing die 2 is avoided, and meanwhile, the accurate driving of the servo motor 13 by a controller is utilized to maintain the surface tension of each divided diaphragm; the spoiler 44 arranged on the rib 42 separates the air flow of the adjacent air opening 51 on the prism table 5, and the air flow blown out of the adjacent air opening 51 on the prism table 5 is adjusted through the swinging of the spoiler 44 by the shaft column 441, so that the blow molding effect on the split silicone film is balanced, and the thickness of the silicone film formed by blow molding is further stabilized; a blade 45 arranged on the sharp edge of the ridge 42 ensures that the divided membrane is in a fixed position on the blown silicone membrane, and the blade tips 451 protruding from the blade 45 prevent the silicone membrane under the bulging condition from being not divided; the directional air cylinder 21 arranged between the pressing films is driven to cooperate with the shaft rod 23 which is rotatably arranged on the frame 1, so that the pressing process of the silica gel film in the pressing film 2 is in a stable range, and the thickness variation range of the produced silica gel vibrating diaphragm is reduced.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A preparation method of a silica gel diaphragm adhesive tape is characterized by comprising the following steps: the preparation method comprises the following steps:
s1, silicon material preparation: vinyl silicone resin is selected as a main material of silica gel, the viscosity of the vinyl silicone resin is 10000mPa & s, the mass fraction of vinyl is 1-3%, hydrogen-containing vinyl silicone oil, the mass fraction of active hydrogen is more than 1%, the viscosity of the hydrogen-containing vinyl silicone oil is more than 15000mPa & s, an inhibitor and a tackifier are added, and finally a reaction catalyst is added;
s2, mixing and forming glue: adding the raw materials selected and matched in the step S1 into a stirring kettle, controlling the temperature in the stirring kettle within 280 ℃, maintaining the pressure in the stirring kettle at 1.5-1.8bar, circularly changing the temperature in the reaction kettle within 220 ℃ to 280 ℃ in the operation process of the stirring kettle, changing the temperature at the speed of 2 ℃/min, and operating for 2-3h to obtain qualified mixed silica gel;
s3, blow-compression mold assembly: adding the silica gel mixed in the step S2 into a hot melt machine (4), blowing the silica gel in a molten state into a die spotting machine through a die head (41) on the hot melt machine (4) to expand, controlling the film forming thickness of the silica gel within 40 mu m by using a blow molding stretching mode, simultaneously dividing a cylindrical silica gel film blown out by using ribs (42) of the die head (41) into four equal parts which respectively correspond to four side surfaces of the die spotting machine and are pressed into a flat film surface through a roll shaft (43), and preliminarily forming the shape of the vibrating diaphragm adhesive tape by using the pressed silica gel film under the action of a pressing die (2) on the die spotting machine;
s4, rolling and shaping: conveying the vibrating diaphragm adhesive tape preliminarily formed in the step S3 to a collecting tank (6), fitting the shape of the silica gel vibrating diaphragm through a bulge (31) on the surface of the roller diaphragm column (3) on the collecting tank (6), and acting with the vibrating diaphragm part on the silica gel diaphragm to finally shape the silica gel vibrating diaphragm;
the die spotting machine in the S3 comprises a frame (1), a die (2), a roller film column (3) and a controller; a hot melting machine (4) is arranged at the bottom of the rack (1), and a frustum-shaped die head (41) is arranged on the hot melting machine (4); four conical edges of the die head (41) are provided with convex ribs (42), and sharp edges on the ribs (42) extend along the conical edges of the die head (41); an inverted frustum pyramid (5) is arranged above the die head (41), air ports (51) are arranged on four edges of the top end of the frustum pyramid (5), and an air pipe (52) is arranged in the middle of the frustum pyramid (5); corresponding pressing dies (2) are respectively arranged above the air openings (51) of the prismatic tables (5), the pressing dies (2) are installed on the rack (1), and the silica gel film is pressed into the shape of the vibrating diaphragm through the pressing dies (2); an air pump (11) communicated to an air pipe (52) is arranged at the top end of the rack (1), cylinder shafts (12) rotatably mounted are arranged on four sides of the top end of the rack (1), and collecting tanks (6) are arranged on four sides of the rack (1) corresponding to the cylinder shafts (12); a roll film column (3) is arranged on the collecting tank (6), and a bulge (31) corresponding to the shape of the vibrating diaphragm is arranged on the roll film column (3); the controller controls the operation of the air pump (11) and the roller film column (3).
2. The preparation method of the silica gel diaphragm adhesive tape according to claim 1, which is characterized in that: the top end of each rib (42) is provided with a supporting ball (421), a support block (422) is arranged on the rack (1) corresponding to the supporting ball (421), and the supporting ball (421) is supported on the support block (422); a roller shaft (43) is arranged between the top ends of the ribs (42), one end of the roller shaft (43) penetrates through the supporting ball (421) to extend out, a roller seat (431) is arranged at the other end of the roller shaft (43), and the roller seat (431) is fixed on the supporting ball (421).
3. The preparation method of the silica gel diaphragm adhesive tape according to claim 2, which is characterized in that: a transmission wheel shell (432) is arranged on the end face of the roller shaft (43) penetrating through the supporting ball (421), and a servo motor (13) is arranged on the position, corresponding to the transmission wheel shell (432), of the rack (1); the servo motor (13) is in transmission connection with the roll shaft (43), and the servo motor (13) is controlled and driven by the controller.
4. The preparation method of the silica gel diaphragm adhesive tape according to claim 2, which is characterized in that: a spoiler (44) is arranged at a position, close to an air inlet (51) of the prismatic table (5), of the prismatic bar (42), a shaft column (441) is arranged at the bottom of the spoiler (44), and the shaft column (441) is vertically and rotatably installed on the prismatic bar (42); the spoiler (44) is swung left and right by the blow molding.
5. The preparation method of the silica gel diaphragm adhesive tape according to claim 4, wherein the preparation method comprises the following steps: the upper part of the sharp edge on the edge strip (42) is provided with a cutting edge (45), the cutting edge of the cutting edge (45) is parallel to the sharp edge of the edge strip (42), and the cutting edge is provided with a convex cutting edge (451).
6. The preparation method of the silica gel diaphragm adhesive tape according to claim 1, which is characterized in that: an air cylinder (21) which is directionally telescopic is arranged between the pressing dies (2), and a push block (22) is arranged in the direction of the pressing die (2) corresponding to the air cylinder (21); the pressing die (2) is connected to an air cylinder (21) through a push block (22), a shaft lever (23) is arranged at the back of the pressing die (2), and the shaft lever (23) is rotatably installed on the rack (1); the die (2) is angularly adjusted by means of a shaft lever (23).
7. A silica gel vibrating diaphragm sticky tape, its characterized in that: the adhesive tape is suitable for the preparation method of any one of the silica gel diaphragm adhesive tapes of claims 1 to 6, and comprises 55 parts of vinyl silicone resin, 35 parts of hydrogen-containing vinyl silicone oil, 3 parts of catalyst, 1 part of inhibitor and 2 parts of tackifier, wherein the catalyst comprises dimethylpolysiloxane and polyarylate, is used immediately after being prepared by field reaction, and is mixed into raw materials for preparing the silica gel diaphragm.
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| CN202010305387.7A CN111572072A (en) | 2020-04-17 | 2020-04-17 | Silica gel vibrating diaphragm adhesive tape and preparation method thereof |
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| CN202010305387.7A CN111572072A (en) | 2020-04-17 | 2020-04-17 | Silica gel vibrating diaphragm adhesive tape and preparation method thereof |
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