Silica gel material composition for drum paper adhesion and adhesion method thereof

Abstract

The invention relates to the technical field of drum paper adhesion, in particular to a silica gel material composition for drum paper adhesion and an adhesion method of the silica gel material composition for drum paper adhesion, and the silica gel material comprises the following components in parts by mass: 100 parts of methyl vinyl silica gel; 40 to 60 parts of MQ silicon resin; 20 to 30 parts of silicone oil; 15 to 25 parts of polyisobutene; 1.5 to 3.0 parts of a vinyl silane coupling agent; 20 to 40 parts of gas-phase white conductive carbon black; 5 to 15 parts of conductive carbon black; 0.8 to 1.5 parts of 2, 5, 6, 6-tetramethyl-2, 5, 6- The silica gel material has the advantage of being good in viscosity, and the silica gel material is applied to drum paper adhesion through the adhesion step, so that the service life of a loudspeaker is prolonged.

Description

Technical Field

[0001] This invention relates to the field of diaphragm bonding technology, and more specifically, to a silicone material composition for diaphragm bonding and a bonding method thereof. Background Technology

[0002] A loudspeaker, also known as a "horn," is a very common electroacoustic transducer found in almost every electronic circuit that produces sound. While it is one of the weakest components in electronic systems, it is also one of the most crucial for sound quality. There are many types of loudspeakers, and their prices vary greatly. Audio energy, through electromagnetic, piezoelectric, or electrostatic effects, causes the cone or diaphragm to vibrate, creating sound.

[0003] In traditional loudspeakers, the diaphragm is fixed with conventional adhesives. However, with prolonged use and under high-frequency vibrations (20Hz-20kHz) of the loudspeaker, the interface is prone to delamination, causing the diaphragm to detach from the surround / voice coil frame. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a silicone material composition for bonding drum paper and a bonding method thereof, which has the advantages of good adhesion and long service life.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a silicone material composition for bonding drum paper, wherein the silicone material comprises the following components in parts by mass:

[0006] Methyl vinyl silicone: 100 parts; MQ silicone resin: 40 to 60 parts; silicone oil: 20 to 30 parts; polyisobutylene: 15 to 25 parts; vinyl silane coupling agent: 1.5 to 3.0 parts; fumed white conductive carbon black: 20 to 40 parts; conductive carbon black: 5 to 15 parts; bis(2,5)sulfurizing agent: 0.8 to 1.5 parts; antioxidant: 1 to 2 parts.

[0007] Preferably, the MQ silicone resin is present in 40 parts by weight.

[0008] Preferably, the silicone oil is in the form of 20 parts by weight.

[0009] Preferably, the vinyl silane coupling agent is at least one of a vinyl vinyl silane coupling agent, an amino vinyl silane coupling agent, or an epoxy vinyl silane coupling agent; and the vinyl silane coupling agent has a mass fraction of 3.0 parts.

[0010] Preferably, the average particle size of the fumed white conductive carbon black is 30 to 100 nanometers; the conductive carbon black is at least one of N330, N550 or N774 conductive carbon black.

[0011] On the other hand, the present invention also provides an adhesive method for use on drum paper, comprising the following operations:

[0012] Step A: Provide the silicone material described above, and fully plasticize and mix the silicone material in a preset kneading device to make the components evenly dispersed to form an adhesive material to be used;

[0013] Step B: Provide a first component and a second component to be glued, wherein the first component is a speaker drum paper, and the second component is a speaker voice coil skeleton or a speaker surround;

[0014] Step C: Pre-treat the bonding surfaces of the first component and the second component. The pre-treatment operation includes at least one of cleaning and surface roughening treatment to improve the subsequent interfacial bonding force.

[0015] Step D: Apply the adhesive prepared in step A evenly to the bonding surfaces of the first component and / or the second component using a pre-set adhesive application device to form an adhesive coating.

[0016] Step E: Align and bond the first component and the second component coated with the adhesive coating to ensure that the bonding surfaces of the first component and the second component are in close contact through the adhesive coating.

[0017] Step F: Place the assembled assembly from Step E into a pressure heating device and perform vulcanization curing under preset temperature, preset pressure, and preset duration conditions, so that the adhesive coating undergoes a cross-linking reaction, thereby forming an adhesive layer with permanent structural strength between the first component and the second component.

[0018] Preferably, in step A, the kneading equipment is an open mill or an internal mixer; the mixing operation specifically includes: first, adding the methyl vinyl silicone to the kneading equipment for plasticizing, then sequentially adding the polyisobutylene, the MQ silicone resin and the silicone oil for blending, then adding the fumed white conductive carbon black, the conductive carbon black and the vinyl silane coupling agent in batches, continuing to mix until uniformly dispersed, and finally adding the bis(2,5)sulfurizing agent and the antioxidant before discharging, and discharging after low-temperature short-time mixing.

[0019] Preferably, in step D, the adhesive application equipment is a dispensing machine, a screen printing machine, or a roller coating machine; the thickness of the adhesive coating is controlled within the range of 0.1 mm to 0.5 mm.

[0020] Preferably, in step F, the preset temperature is 150 to 180 degrees Celsius; the preset pressure is 0.5 MPa to 2.0 MPa; and the preset duration is 5 to 15 minutes.

[0021] In summary, the present invention has the following beneficial effects: Methyl vinyl silicone is used as the elastic matrix, and a moderately cross-linked network is constructed through peroxide vulcanization, endowing the material with the ability to buffer principal vibrations; polyisobutylene, as the viscoelastic phase, dissipates high-frequency mechanical energy through the movement of molecular chain segments; the silane coupling agent's molecular bridging and silicone oil's penetration and anchoring synergistically enhance the interfacial bonding force, forming a three-dimensionally stable adhesive layer structure; vinyl silane is selected as the coupling agent, where the amino groups in vinyl silane condense with the hydroxyl groups of cellulose in the drum paper to form covalent bonds, and the ethoxy groups hydrolyze to form silanols, which then condense with the hydroxyl groups on the silicone surface. Crosslinking achieves molecular-level bridging of cellulose and silica gel. Low-viscosity methyl silicone oil penetrates into the porous cellulose through capillary action, forming mechanically interlocking anchor points after curing, further inhibiting interfacial delamination. Conductive carbon black forms a continuous conductive network to shield ultraviolet light. Antioxidants quench thermal oxygen free radicals, and surface silanization treatment improves dispersibility. Hydrogenated C5 petroleum resin reduces melt viscosity to ensure full wetting of the substrate during hot pressing. Fumed silica adjusts thixotropy and suppresses dripping in the casting process, giving this silica gel material the advantages of good adhesion and long lifespan. Detailed Implementation

[0022] To make the technical problem to be solved, the technical solution, and the beneficial effects of the present invention clearer, the present invention will be further described in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating orientation or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] A silicone material composition for bonding drum paper comprises methyl vinyl silicone as an elastic matrix, which is constructed through peroxide vulcanization to form a moderately cross-linked network, imparting the material with main vibration buffering capability; polyisobutylene as a viscoelastic phase, which dissipates high-frequency mechanical energy through molecular chain segment movement; and silane coupling agent molecular bridging and silicone oil penetration anchoring synergistically enhance interfacial bonding force to form a three-dimensional stable adhesive layer structure. Vinyl silane is selected as the coupling agent, in which the amino groups in vinyl silane condense with the hydroxyl groups of drum paper cellulose to form covalent bonds, and the ethoxy groups hydrolyze to form silanols, which then condense with the hydroxyl groups on the silicone surface. Cross-linking achieves molecular-level bridging between cellulose and silica gel. Low-viscosity methyl silicone oil penetrates into the porous cellulose through capillary action, forming mechanically interlocking anchor points after curing, further inhibiting interfacial delamination. Conductive carbon black forms a continuous conductive network to shield ultraviolet light, while antioxidants quench thermal oxygen free radicals. Surface silanization treatment improves dispersibility, and hydrogenated C5 petroleum resin reduces melt viscosity to ensure full wetting of the substrate during hot pressing. Fumed silica adjusts thixotropy and suppresses dripping during the casting process, giving this silica gel material advantages such as good adhesion and long lifespan.

[0027] Example 1:

[0028]

[0029]

[0030] 100 parts of methyl vinyl silicone were plasticized until softened, and 40 parts of MQ silicone resin, 20 parts of silicone oil, and 15 parts of polyisobutylene were added sequentially and mixed. Then, 1.5 parts of vinyl silane coupling agent, 20 parts of fumed white conductive carbon black, and 5 parts of conductive carbon black were mixed in batches until uniformly dispersed. Finally, 0.8 parts of bis(2,5) sulfide agent and 1 part of antioxidant were added, and the mixture was discharged after low-temperature short-time mixing to form an adhesive mixture.

[0031] Example 2:

[0032]

[0033]

[0034] 100 parts of methyl vinyl silicone were plasticized until softened, and 50 parts of MQ silicone resin, 20 parts of silicone oil, and 15 parts of polyisobutylene were added sequentially and mixed. Then, 3 parts of vinyl silane coupling agent, 20 parts of fumed white conductive carbon black, and 5 parts of conductive carbon black were mixed in batches until uniformly dispersed. Finally, 0.8 parts of bis(2,5)-5-sulfurizing agent and 1 part of antioxidant were added, and the mixture was discharged after low-temperature short-time mixing to form an adhesive mixture.

[0035] Example 3:

[0036]

[0037]

[0038] 100 parts of methyl vinyl silicone were plasticized until softened, and 60 parts of MQ silicone resin, 30 parts of silicone oil, and 15 parts of polyisobutylene were added sequentially and mixed. Then, 1.5 parts of vinyl silane coupling agent, 20 parts of fumed white conductive carbon black, and 5 parts of conductive carbon black were mixed in batches until uniformly dispersed. Finally, 0.8 parts of bis(2,5) sulfide agent and 1 part of antioxidant were added, and the mixture was discharged after low-temperature short-time mixing to form an adhesive mixture.

[0039] Example 4:

[0040]

[0041]

[0042] 100 parts of methyl vinyl silicone were plasticized until softened, and 40 parts of MQ silicone resin, 30 parts of silicone oil, and 25 parts of polyisobutylene were added sequentially and mixed. Then, 2.5 parts of vinyl silane coupling agent, 20 parts of fumed white conductive carbon black, and 5 parts of conductive carbon black were mixed in batches until uniformly dispersed. Finally, 0.8 parts of bis(2,5) sulfide agent and 1 part of antioxidant were added, and the mixture was discharged after low-temperature short-time mixing to form an adhesive mixture.

[0043] Comparative Example 1:

[0044] Components Number of parts by weight Methyl vinyl silicone 100 copies MQ silicone resin 40 copies silicone oil 20 copies Polyisobutylene 15 copies Fumed white conductive carbon black 20 copies Conductive carbon black 5 copies Bis(2,5)sulfide 0.8 copies Antioxidant (1010 / 168) 1 copy

[0045] Remove the vinylsilane coupling agent; otherwise, it is the same as in Example 1. Comparative Example 2:

[0046] Components Number of parts by weight Methyl vinyl silicone 100 copies MQ silicone resin 40 copies Polyisobutylene 15 copies Vinylsilane coupling agent 1.5 copies Fumed white conductive carbon black 20 copies Conductive carbon black 5 copies Bis(2,5)sulfide 0.8 copies Antioxidant (1010 / 168) 1 copy

[0047] Remove the silicone oil; otherwise, it is the same as in Example 1. Comparative Example 3:

[0048]

[0049]

[0050] Remove the vinyl silane coupling agent and silicone oil; otherwise, it is the same as in Example 1.

[0051] The average particle size of the fumed white conductive carbon black is 30 to 100 nanometers; the conductive carbon black is at least one of N330, N550 or N774 conductive carbon black.

[0052] Furthermore, the methyl vinyl silica gel has a vinyl content of 0.15±0.05 mol% and a Mooney viscosity (ML(1+4)) of 40-60 at 100℃.

[0053] The M / Q ratio of MQ silicone resin is 0.6-0.8, and the weight-average molecular weight is 5000-10000 g / mol;

[0054] The silicone oil is dimethyl silicone oil, with a kinematic viscosity of 50-100 cSt at 25°C.

[0055] The antioxidant is a compound of antioxidant 1010 and antioxidant 168.

[0056] Comparison of experimental results:

[0057]

[0058]

[0059] The test method for peel force (according to GB / T2792 standard) shall be conducted in accordance with the peel force test specification (implementation standard GB / T2792-2014), and the test method for holding power (according to GB / T4851 standard) shall be conducted in accordance with the holding power test specification (implementation standard GB / T4851-2014), with the condition of applying a 1kg weight and a 1h load.

[0060] The above-mentioned silicone material applied to the drum paper can be bonded using the following methods:

[0061] I. Preparation steps of compounded rubber

[0062] When using an open mill or internal mixer, operate in the following order:

[0063] (1) Plasticize methyl vinyl silicone until softened;

[0064] (2) Add polyisobutylene, MQ silicone resin and silicone oil in sequence and blend;

[0065] (3) Add fumed white conductive carbon black, conductive carbon black and vinyl silane coupling agent in batches and mix until uniformly dispersed;

[0066] (4) Finally, add the 25% sulfurizing agent and antioxidant, mix at low temperature for a short time and then discharge the material to prevent pre-sulfurization.

[0067] II. Substrate Pretreatment

[0068] Clean the bonding surfaces of the diaphragm and voice coil frame / surround, and perform at least one of the following treatments:

[0069] (1) Solvent cleaning removes oil stains;

[0070] (2) Surface roughening is achieved by mechanical grinding or plasma treatment.

[0071] (3) Apply adhesive by applying adhesive evenly to the surfaces to be bonded using a dispensing machine / screen printing machine / roller coating machine; the coating thickness is controlled between 0.1 and 0.5 mm.

[0072] (4) Alignment and bonding: Align the drum paper with the voice coil frame / circle precisely to ensure that the bonding surfaces are in close contact through the adhesive layer.

[0073] (5) Vulcanization and curing, performed in a hot press with the following parameters:

[0074] Temperature: 150–180℃, Pressure: 0.5–2.0MPa, Time: 5–15 minutes, to complete the cross-linking reaction and form a permanent adhesive layer.

[0075] (6) Cooling and shaping: After depressurization, slowly cool to room temperature to ensure the release of interfacial stress.

[0076] The above embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A composition of silicone gum material for drum paper sticking, characterized by, The silica gel material composition comprises the following components in mass fraction: Methyl vinyl silica gel: 100 parts; MQ silicone resin: 40 to 60 parts; silicone oil: 20 to 30 parts; polyisobutylene: 15 to 25 parts; vinyl silane coupling agent: 1.5 to 3.0 parts; fumed white conductive carbon black: 20 to 40 parts; conductive carbon black: 5 to 15 parts; bis-dipent sulfurizing agent: 0.8 to 1.5 parts; antioxidant: 1 to 2 parts.

2. The composition of claim 1, wherein the composition is a silicone gel material. The mass fraction of the MQ silicone resin is 45-55 parts.

3. The silicone composition for drum paper sticking according to claim 1 or 2, wherein The mass fraction of the silicone oil is 22-28 parts.

4. The composition of claim 1, wherein the composition is a silicone gel material. The vinyl silane coupling agent is at least one of a vinyl vinyl silane coupling agent, an amino vinyl silane coupling agent, or an epoxy vinyl silane coupling agent; and the mass fraction of the vinyl silane coupling agent is 1.5 to 3.0 parts, preferably 3.0 parts.

5. The composition of claim 1, wherein the composition is a silicone rubber composition. The average particle size of the fumed white conductive carbon black is 30 to 100 nanometers; and the conductive carbon black is at least one of N330 type, N550 type, or N774 type conductive carbon black.

6. A method of applying an adhesive to a drum head, comprising: The method comprises the following steps: Step A: providing the silica gel material according to any one of claims 1 to 5, and sufficiently plasticizing and mixing the silica gel material in a preset kneading device, so that the components are uniformly dispersed to form a ready-to-use adhesive material; Step B: providing a first component and a second component to be adhered, wherein the first component is a loudspeaker drum paper, and the second component is a loudspeaker voice coil skeleton or a loudspeaker folded ring; Step C: pretreating the surfaces to be bonded of the first component and the second component, the pretreatment operation comprising at least one of cleaning and surface roughening treatment, so as to improve the subsequent interfacial bonding strength; Step D: uniformly applying the ready-to-use adhesive material prepared in step A to the surfaces to be bonded of the first component and / or the second component through a preset adhesive application device, to form an adhesive coating; Step E: aligning and bonding the first component and the second component coated with the adhesive coating, to ensure that the surfaces to be bonded of the first component and the second component are in close contact through the adhesive coating; Step F: placing the bonded combination in step E in a pressure and heating device for vulcanization and curing treatment under preset temperature, pressure and time conditions, so that the adhesive coating undergoes crosslinking reaction, thereby forming a bonding layer with permanent structural strength between the first component and the second component.

7. The sticking step applied to drum paper according to claim 6, wherein In step A, the kneading device is an open mill or an internal mixer; the mixing operation specifically comprises: first adding the methyl vinyl silica gel into the kneading device for plasticizing, then sequentially adding the polyisobutylene, the MQ silicone resin and the silicone oil for blending, subsequently adding the fumed white conductive carbon black, the conductive carbon black and the vinyl silane coupling agent in batches, continuing to mix until uniformly dispersed, and finally adding the bis-dipent sulfurizing agent and the antioxidant before discharging, and discharging after low-temperature and short-time mixing.

8. The gluing step applied to drumheads according to claim 6 or 7, wherein, In the step D, the sizing equipment is a point glue machine, a silk screen printing machine or a roller coater; the application thickness of the tacky material coating is controlled within the range of 0.1mm to 0.5mm.

9. The gluing step applied to drumheads according to claim 8, wherein, In the step F, the preset temperature is 150 to 180 degrees Celsius; the preset pressure is 0.5 to 2.0 megapascals; and the preset time length is 5 to 15 minutes.

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