Vibrating diaphragm of sound production device and sound production device

Abstract

The invention belongs to the technical field of electroacoustics, and particularly relates to a vibrating diaphragm of a sound production device and the sound production device. The vibrating diaphragm of the sound production device comprises at least one phenyl silicone rubber layer, the phenyl silicone rubber layer contains a network polymer, and the phenyl silicone rubber layer is formed by curing liquid phenyl silicone rubber compound. The liquid phenyl silicone rubber compound comprises methyl phenyl vinyl polysiloxane, methyl phenyl vinyl silicone resin and phenyl hydrogen-containing silicone oil. According to the vibrating diaphragm with the phenyl silicone rubber layer, the bonding force between the vibrating diaphragm and a shell and between the vibrating diaphragm and a voice coil can be remarkably improved, and meanwhile, phenyl hydrogen-containing silicone oil and methyl phenyl vinyl polysiloxane have good compatibility, so that the phenyl silicone rubber layer is better in curing uniformity, more balanced in mechanical property and not prone to failure; in addition, the vibrating diaphragm has high damping performance, THD distortion of the vibrating diaphragm can be remarkably reduced, and the vibrating diaphragm has better acoustic performance.

Description

Technical Field

[0001] The invention belongs to the technical field of electroacoustics, and in particular relates to a diaphragm of a sound-generating device and the sound-generating device. Background Art

[0002] As we all know, silicone rubber is widely used in the production of diaphragms in sound-generating devices due to its high resilience, high temperature resistance and good waterproof performance. However, due to the low surface energy of silicone rubber itself, the adhesion between the silicone rubber diaphragm and the housing and voice coil of the sound-generating device is relatively low. In order to improve the adhesion between silicone rubber and other materials, other materials are generally treated with primers to improve the adhesion. However, this will complicate the process flow and increase the production cost of the product. In addition, the primer will have problems such as solvent volatilization during the treatment process, which will affect the health of the operator.

[0003] Therefore, the diaphragm and sound-generating device of the existing sound-generating device still need to be improved. Summary of the invention

[0004] The main purpose of the present invention is to provide a diaphragm of a sound-emitting device and a sound-emitting device. The diaphragm with a phenyl silicone rubber layer in the present invention can significantly improve the adhesion between the diaphragm and the shell and the voice coil, and at the same time has high damping performance, and can also significantly reduce the THD distortion of the diaphragm, and has better acoustic performance.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions.

[0006] In a first aspect, the present invention provides a diaphragm of a sound-generating device, the diaphragm comprising at least one phenyl silicone rubber layer, the phenyl silicone rubber layer being formed by curing a liquid phenyl silicone rubber compound, the liquid phenyl silicone rubber compound comprising methyl phenyl vinyl polysiloxane, methyl phenyl vinyl silicone resin and phenyl hydrogenated silicone oil; the phenyl silicone rubber layer containing a network polymer, the network polymer comprising a segment: Wherein, the R group is at least one of a methyl group and a phenyl group. The mass percentage of the phenyl groups in the chain segments in the entire phenyl silicone rubber layer is 3% to 30%.

[0007] In some embodiments of the present invention, the hardness of the phenyl silicone rubber layer is 30A to 90A; and / or,

[0008] The tensile strength of the phenyl silicone rubber layer is 1 MPa to 10 MPa; and / or,

[0009] The loss factor of the phenyl silicone rubber layer is 0.15 to 0.4; and / or,

[0010] The light transmittance of the phenyl silicone rubber layer is 20% to 75%.

[0011] In some embodiments of the present invention, the The mass percentage of the phenyl groups in the chain segments in the entire phenyl silicone rubber layer is 8% to 20%.

[0012] In some embodiments of the present invention, in the liquid phenyl silicone rubber compound, the mass percentage of the methylphenyl vinyl silicone resin is 2wt% to 25wt%; and / or,

[0013] The mass percentage of the phenyl hydrogen silicone oil is 0.1-5wt%; and / or,

[0014] The mass percentage of the methylphenylvinyl polysiloxane is 45wt% to 90wt%.

[0015] In some embodiments of the present invention, the mass percentage of phenyl groups in the phenyl hydrogen-containing silicone oil is 2wt% to 50wt%, and the mass percentage of hydrogen groups in the phenyl hydrogen-containing silicone oil is 0.05wt% to 1.5wt%; and / or,

[0016] The mass percentage of the vinyl group in the methylphenylvinyl polysiloxane is 0.05 wt % to 9 wt %, and the mass percentage of the phenyl group in the methylphenylvinyl polysiloxane is 3 wt % to 45 wt %.

[0017] In some embodiments of the present invention, the liquid phenyl silicone rubber compound further includes a reinforcing agent.

[0018] In some embodiments of the present invention, the reinforcing agent is selected from silicon dioxide; and / or,

[0019] The mass percentage of the reinforcing agent is 5wt% to 45wt%.

[0020] In some embodiments of the present invention, the liquid phenyl silicone rubber compound further includes at least one of an inhibitor and a catalyst.

[0021] In some embodiments of the present invention, the mass percentage of the inhibitor is 0.01wt% to 0.2wt%; and / or,

[0022] The mass percentage of the catalyst is 0.005wt% to 0.2wt%.

[0023] In some embodiments of the present invention, the inhibitor comprises at least one of an acetylenic alcohol inhibitor and a polyvinyl polysiloxane inhibitor; and / or,

[0024] The catalyst is selected from platinum catalysts.

[0025] In some embodiments of the present invention, the liquid phenyl silicone rubber compound further comprises methyl phenyl silicone resin, and the mass percentage of the methyl phenyl silicone resin in the liquid phenyl silicone rubber compound is 0 to 20 wt % and is not 0.

[0026] In some embodiments of the present invention, the mass percentage of phenyl groups in the methylphenyl silicone resin is 2 wt % to 50 wt %.

[0027] In some embodiments of the present invention, the diaphragm of the sound-emitting device includes at least one phenyl silicone rubber layer, and the phenyl silicone rubber layer is formed by curing a liquid phenyl silicone rubber compound, and the liquid phenyl silicone rubber compound includes methylphenyl vinyl polysiloxane, methylphenyl vinyl silicone resin, phenyl hydrogenated silicone oil, a reinforcing agent, an inhibitor and a catalyst.

[0028] In some embodiments of the present invention, the diaphragm of the sound-emitting device includes at least one phenyl silicone rubber layer, and the phenyl silicone rubber layer is formed by curing a liquid phenyl silicone rubber compound, and the liquid phenyl silicone rubber compound includes methylphenyl vinyl polysiloxane, methylphenyl vinyl silicone resin, phenyl hydrogenated silicone oil, methylphenyl silicone resin, a reinforcing agent, an inhibitor and a catalyst.

[0029] In some embodiments of the present invention, the diaphragm is a single-layer structure, and the diaphragm is composed of a layer of the phenyl silicone rubber layer; or,

[0030] The diaphragm is formed into a composite layer structure, which includes at least one layer of the phenyl silicone rubber layer and a composite layer, and the composite layer includes at least one of a thermoplastic elastomer layer, an engineering plastic layer and a film layer.

[0031] A second aspect of the present invention provides a sound-generating device, which includes the diaphragm of the sound-generating device described in the first aspect.

[0032] In some embodiments of the present invention, the sound-generating device comprises a housing, and the diaphragm of the sound-generating device and the housing are integrally formed by heating and curing; and / or,

[0033] The sound-generating device has a waterproof rating of at least 1ATM.

[0034] Compared with the prior art, the present invention achieves the following technical effects:

[0035] The diaphragm in the present invention significantly improves its adhesion to the housing and the voice coil through the design of the phenyl silicone rubber layer, and the mechanical properties of the diaphragm are more balanced. At the same time, it has high damping performance, which can significantly reduce the THD distortion of the diaphragm and has better acoustic performance.

[0036] In the present invention, the components of the liquid phenyl silicone rubber compound that forms the phenyl silicone rubber layer are designed, and the hardness and tensile strength of the diaphragm, as well as the adhesion between the diaphragm and the housing and the voice coil are significantly improved through the synergistic effect of methylphenyl vinyl silicone resin, methylphenyl vinyl polysiloxane and phenyl hydrogenated silicone oil, and the damping performance of the diaphragm is also higher. At the same time, the diaphragm has good light transmittance, and when the diaphragm and the voice coil are bonded by UV glue, the UV glue can be quickly and completely cured to improve the adhesion between the diaphragm and the voice coil; in addition, phenyl hydrogenated silicone oil and methylphenyl vinyl polysiloxane have good compatibility, so that the curing uniformity of the phenyl silicone rubber layer is better, so that the mechanical properties of the diaphragm are more balanced and not easy to fail.

[0037] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0039] Figure 1 is a cross-sectional view of a sound-generating device according to some embodiments of the present invention;

[0040] Figure 2 Schematic diagram of THD curves of diaphragms according to Comparative Example 1 and Example 2 of the present invention.

[0041] Reference numerals

[0042] 100. Sound-generating device;

[0043] 10. Shell; 20. Diaphragm; 30. Voice coil; 40. Magnetic circuit system. DETAILED DESCRIPTION

[0044] The exemplary embodiments of the present invention will be described in more detail below with reference to specific embodiments. It should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] At present, general phenyl silicone rubber is reinforced with methyl vinyl silicone resin, but due to the general compatibility between methyl vinyl silicone resin and methyl phenyl vinyl silicone oil, the light transmittance of phenyl silicone rubber deteriorates, affecting the UV light transmittance, resulting in an increase in the curing time of the UV glue between the diaphragm and the voice coil, and insufficient bonding strength.

[0050] In addition, traditional hydrogen-containing silicone oil is generally used as a cross-linking agent in phenyl silicone rubber. However, traditional hydrogen-containing silicone oil has poor compatibility with methylphenyl vinyl silicone oil and poor dispersibility in phenyl liquid silicone rubber, resulting in poor local cross-linking uniformity of phenyl silicone rubber and poor local mechanical properties. This causes local damage to the speaker during the reliability verification process, leading to speaker failure.

[0051] To this end, the present invention provides a diaphragm of a sound-generating device, the diaphragm comprising at least one phenyl silicone rubber layer, the phenyl silicone rubber layer being solidified by a liquid phenyl silicone rubber compound, the liquid phenyl silicone rubber compound comprising methyl phenyl vinyl polysiloxane, methyl phenyl vinyl silicone resin and phenyl hydrogenated silicone oil; the phenyl silicone rubber layer containing a network polymer, the network polymer comprising a segment: Wherein, the R group is at least one of a methyl group and a phenyl group. The mass percentage of the phenyl groups in the chain segments in the entire phenyl silicone rubber layer is 3% to 30%.

[0052] The liquid phenyl silicone rubber compound forming the phenyl silicone rubber layer in the present invention uses methylphenyl vinyl silicone resin as a reinforcing material. The methylphenyl vinyl silicone resin contains a phenyl structure. The polarity of the phenyl structure is relatively strong, so the methylphenyl vinyl silicone resin has a relatively high polarity, which can significantly improve the hardness and tensile strength of the phenyl silicone rubber layer, and more prominently, significantly improve the adhesion between the phenyl silicone rubber layer and the shell and the voice coil, and the damping performance of the phenyl silicone rubber layer is also higher. Moreover, the methylphenyl vinyl silicone resin has good compatibility with methylphenyl vinyl polysiloxane, and the diaphragm prepared thereby has good light transmittance. When the diaphragm and the voice coil are bonded by UV glue, the UV glue can be quickly and comprehensively cured to improve the adhesion between the diaphragm and the voice coil; the phenyl hydrogenated silicone oil has good compatibility with methylphenyl vinyl polysiloxane, and can be better dispersed in the liquid phenyl silicone rubber compound, thereby making the phenyl silicone rubber layer have better curing uniformity and balanced mechanical properties, and work normally without failure during the reliability verification process.

[0053] Methylphenylvinyl polysiloxane is a product obtained by introducing methylphenylsiloxane chain segments or diphenylsiloxane chain segments into the molecular chain of methylvinyl polysiloxane. The introduction of phenyl groups into the side groups of methylvinyl polysiloxane destroys the regularity of the dimethylsiloxane structure, greatly reduces the crystallization temperature of the polymer, and expands the low-temperature application range of the polymer material.

[0054] According to the different phenyl content, it can be divided into: low phenyl polysiloxane, medium phenyl polysiloxane and high phenyl polysiloxane. In low phenyl polysiloxane, the phenyl content is 5wt% to 10wt%; in medium phenyl polysiloxane, the phenyl content is 10wt% to 30wt%; in high phenyl polysiloxane, the phenyl content is higher than 30wt%.

[0055] In some embodiments of the present invention, in the liquid phenyl silicone rubber compound, the mass percentage of methylphenyl vinyl polysiloxane is 45wt% to 90wt%. Exemplarily, the mass percentage of methylphenyl vinyl polysiloxane can be one of 45wt%, 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt%, 90wt% or any value that satisfies the above range. When the mass percentage of methylphenyl vinyl polysiloxane is less than 45wt%, the viscosity of the liquid phenyl silicone rubber compound is too large, resulting in the inability to inject glue during the production process, and also causing the resilience of the phenyl silicone rubber layer to deteriorate, the elongation at break to decrease, and the overall performance to be poor; and if the mass percentage of methylphenyl vinyl polysiloxane is greater than 90wt%, the amount of the reinforcing component methylvinylphenyl silicone resin and the reinforcing agent is insufficient, resulting in the phenyl silicone rubber layer having a low hardness, low modulus, and low tensile strength, which will be easily broken and failed during the reliability verification process.

[0056] In some embodiments of the present invention, the mass percentage of vinyl in methylphenylvinylpolysiloxane is 0.05wt% to 9wt%. Exemplarily, the mass percentage of vinyl in methylphenylvinylpolysiloxane can be 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt% or any value satisfying the above range. Among them, when the mass percentage of vinyl is lower than 0.05wt%, the cross-linking degree of the formed silicone rubber layer is too low, resulting in too low hardness, which cannot meet the use requirements of the diaphragm; when the mass percentage of vinyl is higher than 9wt%, the cross-linking degree of the formed silicone rubber layer is too high, which will cause the elongation at break of the silicone film to decrease significantly, the tensile strength to decrease, and the tear performance to decrease. The formed diaphragm is prone to breakage and failure during reliability verification and cannot meet the use requirements.

[0057] In some embodiments of the present invention, the mass percentage of phenyl in methylphenyl vinyl polysiloxane is 3wt% to 45wt%. Exemplarily, the mass percentage of phenyl in methylphenyl vinyl polysiloxane can be 3wt%, 5wt%, 8wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt% or any value that satisfies the above range. Among them, when the mass percentage of phenyl is lower than 3wt%, the damping of the silicone rubber layer formed by methylphenyl vinyl polysiloxane is small, which will cause the distortion of the diaphragm to increase; and when the mass percentage of phenyl is higher than 45wt%, the viscosity of the formed liquid phenyl silicone rubber compound is too large, resulting in ineffective injection production, thereby failing to achieve injection molding of the diaphragm.

[0058] Methylphenylvinyl silicone resin is a synthetic resin made by the condensation reaction of methylphenylvinyl monomer and siloxane monomer.

[0059] Compared with traditional methyl vinyl silicone resin, methyl phenyl vinyl silicone resin has good compatibility with methyl phenyl vinyl polysiloxane, and the phenyl silicone rubber diaphragm obtained therefrom has good light transmittance and high UV light transmittance. In the embodiment of the present invention, the phenyl silicone rubber diaphragm and the voice coil are bonded with UV glue, and UV light can pass through the phenyl silicone rubber so that the UV glue can be cured quickly, efficiently and completely; the UV glue has a short curing time and a strong bonding force, thereby improving the bonding strength between the diaphragm and the voice coil.

[0060] In some embodiments of the present invention, in the liquid phenyl silicone rubber compound, the mass percentage of methylphenyl vinyl silicone resin is 2wt% to 25wt%. Exemplarily, the mass percentage of methylphenyl vinyl silicone resin can be one of 2wt%, 5wt%, 8wt%, 10wt%, 12wt%, 15wt%, 18wt%, 20wt%, 22wt%, 25wt% or any value that satisfies the above range. It was found in the verification that with the increase of the content of methylphenyl vinyl silicone resin, the hardness and tensile strength of the phenyl silicone rubber layer will increase, indicating that it has a good reinforcement effect; when the mass percentage of methylphenyl vinyl silicone resin is less than 2wt%, the adhesion of the phenyl silicone rubber layer to the voice coil and the shell is significantly reduced, and it is easy to crack and fail during vibration; when the mass percentage of methylphenyl vinyl silicone resin is greater than 25wt%, the tensile strength of the phenyl silicone rubber layer is reduced, and the elongation at break drops sharply, resulting in the diaphragm being easily broken and failing in high-power reliability verification.

[0061] In some embodiments of the present invention, in the liquid phenyl silicone rubber compound, the mass percentage of the phenyl hydrogen silicone oil is 0.1wt% to 5wt%. Exemplarily, the mass percentage of the phenyl hydrogen silicone oil can be 0.1wt%, 0.2wt%, 0.5wt%, 0.8wt%, 1.0wt%, 1.2wt%, 1.5wt%, 1.8wt%, 2.0wt%, 2.2wt%, 2.5wt%, 2.8wt%, 3.0wt%, 3.2wt%, 3.5wt%, 3.8wt%, 4.0wt%, 4.2wt%, 4.5wt%, 4.8wt%, 5wt% or any value satisfying the above range. When the mass percentage of phenyl hydrogenated silicone oil is less than 0.1%, the crosslinking degree of the phenyl silicone rubber layer will be insufficient, resulting in the surface stickiness of the phenyl silicone rubber layer, which is easy to adhere to impurities; the resilience will deteriorate, and the tensile strength will decrease, resulting in poor overall performance of the phenyl silicone rubber layer; thus, the diaphragm will be easily broken and fail in long-term high-power reliability verification. When the mass percentage of phenyl hydrogenated silicone oil is greater than 5wt%, the crosslinking degree of the phenyl silicone rubber layer will be too high, resulting in a small molecular weight between the crosslinking points of the phenyl silicone rubber layer, resulting in a small elongation at break of the phenyl silicone rubber layer, and poor tearing performance, thus causing the diaphragm to be easily broken and fail during long-term vibration.

[0062] In some embodiments of the present invention, the mass percentage of phenyl in phenyl hydrogen silicone oil is 2wt% to 50wt%. It should be noted that if the mass percentage of phenyl in phenyl hydrogen silicone oil is lower than 2wt%, the compatibility of phenyl hydrogen silicone oil with methylphenyl vinyl polysiloxane will deteriorate, resulting in poor compatibility in liquid phenyl silicone rubber compound, difficulty in dispersion, and ultimately uneven local cross-linking of the silicone rubber film layer and poor mechanical properties; and if the mass percentage of phenyl in phenyl hydrogen silicone oil is higher than 50wt%, the synthesis of phenyl hydrogen silicone oil is difficult. When the mass percentage of phenyl in phenyl hydrogen silicone oil is 2wt% to 50wt%, the cross-linking uniformity of the phenyl silicone rubber layer can be improved, and then the mechanical properties of the diaphragm can be improved. Exemplarily, the mass percentage of phenyl in phenyl hydrogen silicone oil can be one of 2wt%, 5wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt%, or any value that meets the above range value.

[0063] In some embodiments of the present invention, the mass percentage of hydrogen groups in the phenyl hydrogen-containing silicone oil is 0.05wt% to 1.5wt%. It should be noted that if the hydrogen content in the phenyl hydrogen-containing silicone oil is lower than 0.05wt%, the phenyl hydrogen-containing silicone oil can only play a chain extension role, resulting in low crosslinking of the phenyl silicone rubber film layer and poor mechanical properties; and if the hydrogen content in the phenyl hydrogen-containing silicone oil is higher than 1.5wt%, the crosslinking of the phenyl silicone rubber film layer will be too high, resulting in insufficient elasticity and increased brittleness of the silicone rubber layer, which cannot meet the actual use requirements of the diaphragm. When the mass percentage of hydrogen groups in the phenyl hydrogen-containing silicone oil is 0.05wt% to 1.5wt%, the phenyl silicone rubber film layer can maintain a suitable degree of crosslinking, thereby improving the mechanical properties and resilience of the diaphragm. Exemplarily, the mass percentage of hydrogen groups in the phenyl hydrogenated silicone oil can be one of 0.05wt%, 0.08wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1.0wt%, 1.2wt%, 1.5wt% or any value that meets the above range.

[0064] In some embodiments of the present invention, in the liquid phenyl silicone rubber compound, the mass percentage of methylphenylvinyl silicone resin is 2wt% to 25wt%, the mass percentage of phenyl hydrogenated silicone oil is 0.1-5wt%, and the mass percentage of methylphenylvinyl polysiloxane is 45wt% to 90wt%.

[0065] In the present invention, the phenyl silicone rubber layer has a network polymer, and the core segment of the network polymer is: The R group can be a methyl group or a phenyl group. The mass percentage of phenyl in the chain segment accounts for 3% to 30% of the entire phenyl silicone rubber layer. If the mass percentage of phenyl in the chain segment is less than 3%, the damping performance of the phenyl silicone layer is average, and the THD distortion of the formed diaphragm is too high, affecting the listening performance of the speaker; and if the mass percentage of phenyl is higher than 30%, the viscosity of the formed liquid phenyl silicone rubber compound is too high, so that the compound cannot be effectively injected into the mold, and production cannot be carried out. In some embodiments of the present invention, The mass percentage of the phenyl group in the chain segment to the entire phenyl silicone rubber layer is 8% to 20%. Exemplarily, the mass percentage of the phenyl group to the entire phenyl silicone rubber layer can be 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% or any value that meets the above range.

[0066] In the present invention, the phenyl silicone rubber layer has a network polymer, and the network polymer further comprises a segment

[0067] Among them, the phenyl structure contained in methylphenyl vinyl silicone resin has a high steric hindrance effect during the movement of the molecular chain, which will increase the friction between the molecular chains, thereby improving the damping of the silicone rubber layer; and the phenyl structure has a high polarity, which can enhance the induction force and orientation force of the bonding interface between the diaphragm and the shell and the voice coil, thereby significantly increasing the intermolecular force between the bonding interfaces, thereby improving the interfacial bonding strength.

[0068] In the present invention, the hardness of the phenyl silicone rubber layer is 30A to 90A. The hardness of the phenyl silicone rubber layer can be changed according to the needs of the diaphragm performance by adjusting the content of methylphenyl vinyl silicone resin and the content ratio of other components in the liquid phenyl silicone rubber compound, so that the hardness of the phenyl silicone rubber layer is between 30A and 90A. Exemplarily, the hardness of the phenyl silicone rubber layer can be one of 30A, 35A, 40A, 45A, 50A, 55A, 60A, 65A, 70A, 75A, 80A, 85A, 90A or any value that meets the above range. By adopting a hardness in the range of 30A to 90A, the stiffness and elasticity required by the diaphragm can be better met, ensuring the use effect of the speaker.

[0069] In an embodiment of the present invention, the tensile strength of the phenyl silicone rubber layer is 1MPa to 10MPa. The tensile strength of the phenyl silicone rubber layer can be adjusted according to the requirements of the diaphragm, for example, it can be one of 1MPa, 2MPa, 3MPa, 4MPa, 5MPa, 6MPa, 7MPa, 8MPa, 9MPa, 10MPa or any value that satisfies the above range. By making the tensile strength of the phenyl silicone rubber layer between 1MPa and 10MPa, the diaphragm can have a certain elasticity while ensuring a certain rigidity, and is not prone to problems such as membrane breakage and membrane folding, thereby increasing the service life of the speaker.

[0070] In an embodiment of the present invention, the conventional loss factor of the phenyl silicone rubber layer is 0.15 to 0.4. Exemplarily, the loss factor of the phenyl silicone rubber layer may be one of 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.32, 0.34, 0.36, 0.38, 0.4 or any value that satisfies the above range. The use of a phenyl silicone rubber layer with a normal temperature loss factor in this range can optimize the performance of the diaphragm and significantly reduce the vibration THD of the phenyl silicone rubber layer. Generally, the higher the loss factor, the better the damping of the material. Improving the damping of the diaphragm material is conducive to reducing polarization during vibration, reducing product distortion, and improving the listening yield.

[0071] In an embodiment of the present invention, the light transmittance of the phenyl silicone rubber layer is 20% to 75%. Exemplarily, the light transmittance of the phenyl silicone rubber layer can be one of 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75% or any value that satisfies the above range. The phenyl silicone rubber layer has good light transmittance and high UV light transmittance. The diaphragm and the voice coil are bonded with UV glue. UV light can pass through the phenyl silicone rubber layer, so that the UV glue can be cured quickly, efficiently and completely. The UV glue has a short curing time and a strong bonding force.

[0072] The diaphragm of the sound-generating device of the embodiment of the present invention includes at least one phenyl silicone rubber layer, that is, the diaphragm in the present invention can be formed into a single-layer structure or a multi-layer composite structure. When the diaphragm is a single-layer structure, the diaphragm is made of a layer of the phenyl silicone rubber layer in the present invention. When the diaphragm is a multi-layer composite structure, the diaphragm includes at least one phenyl silicone rubber layer, and the diaphragm can be formed by compounding the phenyl silicone rubber layer of the present invention and a film layer of other materials.

[0073] In some embodiments of the present invention, when the diaphragm contains multiple layers of phenyl silicone rubber layers, two adjacent layers of phenyl silicone rubber layers can be spaced apart, that is, a film layer of other materials can be set between two adjacent layers of phenyl silicone rubber layers. Of course, two adjacent layers of phenyl silicone rubber layers can also be bonded together. The setting can be selected according to actual use requirements, and the present invention does not impose specific restrictions on this.

[0074] In some embodiments of the present invention, the diaphragm includes a phenyl silicone rubber layer and other composite layers, and the composite layer is one or more of a thermoplastic elastomer layer, an engineering plastic layer, or a film layer. Among them, the thermoplastic elastomer layer includes at least one of a polyester thermoplastic elastomer, a polyurethane thermoplastic elastomer, a polystyrene thermoplastic elastomer, and a polyamide thermoplastic elastomer. The material of the engineering plastic layer includes at least one of polyetheretherketone (PEEK), polyarylate (PAR), polymethacrylimide (PMI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), nylon (PA), polyetherimide (PEI), and liquid crystal polymer (LCP). The film layer includes at least one of an acrylic film and a silicone film.

[0075] In the present invention, the liquid phenyl silicone rubber compound further includes a reinforcing agent, which mainly serves to improve the tensile and tearing properties of the silicone film. Optionally, the reinforcing agent is selected from silicon dioxide.

[0076] In some embodiments of the present invention, the mass percentage of the reinforcing agent is 5wt% to 45wt%. Exemplarily, the mass percentage of the reinforcing agent can be one of 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt% or any value that satisfies the above range. If the mass percentage of the reinforcing agent is lower than 5wt%, the reinforcing effect on the silicone rubber layer is insufficient, and the tensile and tearing properties of the silicone rubber layer are poor; and if the mass percentage of the reinforcing agent is higher than 45wt%, the viscosity of the liquid phenyl silicone rubber compound will be too high, the injection of the glue will be difficult during the production process, the elongation at break of the silicone film will be too low, and it will be easy to break and fail during large amplitude vibration.

[0077] In the present invention, the liquid phenyl silicone rubber compound further includes at least one of an inhibitor and a catalyst.

[0078] In some embodiments of the present invention, the mass percentage of the inhibitor is 0.01wt% to 0.2wt%. For example, the mass percentage of the inhibitor can be 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.10wt%, 0.12wt%, 0.14wt%, 0.16wt%, 0.18wt%, 0.2wt% or any value that satisfies the above range. When the mass percentage of the inhibitor is less than 0.01wt%, the inhibitor effect is general, resulting in a rapid increase in the viscosity of the liquid phenyl silicone rubber compound during storage at room temperature, resulting in the inability to inject glue; and when the mass percentage of the inhibitor is greater than 0.2%, the inhibitor is too much, which will cause the vulcanization rate of the liquid phenyl silicone rubber compound to slow down, thereby causing the molding cycle to be too long, affecting the molding efficiency of the product.

[0079] In some embodiments of the present invention, the inhibitor includes at least one of an acetylenic alcohol inhibitor and a polyvinyl polysiloxane inhibitor. For example, the inhibitor may specifically include: 3-methyl-1-butyn-3-ol, 3-methyl-1-pentyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynyl-1-cyclohexanol, 3-phenyl-1-butyn-3-ol; the polyvinyl inhibitor includes: 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane.

[0080] In some embodiments of the present invention, the catalyst is selected from a platinum catalyst. It is worth mentioning that there are three main types of platinum catalysts: the first type: chloroplatinic acid (H2PtCl6·6H2O) is dissolved in organic solvents such as ethanol, isopropanol and tetrahydrofuran, and allowed to interact to form a complex, called "Speier catalyst", which is simple and fast to make and easy to use; the second type: platinum catalyst is a complex of platinum and vinyl double heads, called Karstedt's catalyst (Karstedt's catalyst), which has high reaction activity, can be stored stably, and has good compatibility with various types of polysiloxanes. It is the most widely used catalyst in addition-type silicone release agents; including: platinum-1,3-divinyltetramethyldisiloxane complex, platinum-1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane complex. The third type: platinum catalyst, is chloroplatinic acid, in addition to forming complexes with other unsaturated compounds, it also forms complexes with ketones, cyclopentadiene, esters, alcohols, crown ethers, crown ethers containing heteroatoms, and polysiloxanes, etc., and is used as a catalyst. These include: platinum-bis(alkynyl)bis(triphenylphosphine) complex, platinum-bis(alkynyl)(cyclodiene) complex.

[0081] In some embodiments of the present invention, the mass percentage of the platinum catalyst in the liquid phenyl silicone rubber compound is 0.005wt% to 0.2wt%. Exemplarily, the mass percentage of the platinum catalyst can be 0.005wt%, 0.006wt%, 0.007wt%, 0.008wt%, 0.009wt%, 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt%, 0.06wt%, 0.07wt%, 0.08wt%, 0.09wt%, 0.1wt%, 0.12wt%, 0.14wt%, 0.16wt%, 0.18wt%, 0.2wt% or any value that meets the above range. It should be noted that when the mass percentage of the platinum catalyst is less than 0.0001%, the curing rate of the liquid phenyl silicone rubber compound is too slow, resulting in a long curing time of the product, affecting the production efficiency of the product; and when the mass percentage of the platinum catalyst is greater than 0.005%, the curing rate of the liquid phenyl silicone rubber compound is too fast, and its viscosity will increase rapidly during storage at room temperature, resulting in process instability; and during the curing process, due to too fast curing, the internal stress of the phenyl silicone rubber layer is insufficiently released, and the phenyl silicone rubber layer is prone to deformation.

[0082] In the present invention, the liquid phenyl silicone rubber compound also includes methylphenyl silicone resin, and the mass percentage of methylphenyl silicone resin in the liquid phenyl silicone rubber compound is 0 to 20wt% and is not 0. It should be noted that if the mass percentage of methylphenyl silicone resin is greater than 20wt%, the elongation at break of the molded silicone rubber layer is significantly reduced, and the diaphragm is prone to rupture and failure during large-amplitude vibration. Exemplarily, the mass percentage of methylphenyl silicone resin in the liquid phenyl silicone rubber compound can be one of 0.1wt%, 0.3wt%, 0.5wt%, 0.8wt%, 1wt%, 3wt%, 5wt%, 8wt%, 10wt%, 12wt%, 15wt%, 18wt%, 20wt% or any value that meets the above range value.

[0083] In some embodiments of the present invention, the mass percentage of phenyl in the methylphenyl silicone resin is 2wt% to 50wt%. If the mass percentage of phenyl in the methylphenyl silicone resin is less than 2wt%, the damping performance of the formed silicone rubber layer is general, and the adhesion between the diaphragm and the shell is insufficient; if the mass percentage of phenyl is greater than 50wt%, the viscosity of the liquid phenyl silicone rubber compound is too large, and the injection of glue is difficult during the production process. Exemplarily, the mass percentage of phenyl in the methylphenyl silicone resin can be 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt% or any value that meets the above range.

[0084] In some embodiments of the present invention, the liquid phenyl silicone rubber compound includes methylphenyl vinyl polysiloxane, methylphenyl vinyl silicone resin, phenyl hydrogen silicone oil, silicon dioxide, an inhibitor and a catalyst.

[0085] In some embodiments of the present invention, the liquid phenyl silicone rubber compound includes methylphenyl vinyl polysiloxane, methylphenyl vinyl silicone resin, phenyl hydrogen silicone oil, silicon dioxide, an inhibitor, a catalyst and methylphenyl silicone resin.

[0086] The present invention further provides a sound-generating device, which includes a diaphragm of the sound-generating device of any of the above-mentioned embodiments.

[0087] In the embodiment of the present invention, the sound-generating device comprises a shell, and the diaphragm of the sound-generating device and the shell are integrally heated and solidified. The material of the shell can be, but is not limited to, a fiber-reinforced polycarbonate material or a fiber-reinforced polyamide material.

[0088] The diaphragm provided by the present invention can be used to form a sound-generating device of any structure, such as the following typical sound-generating devices: Figure 1 As shown, the sound-generating device 100 may be a speaker, which includes a housing 10, a vibration system disposed in the housing 10, and a magnetic circuit system 40 matched with the vibration system, wherein the vibration system includes a diaphragm 20 and a voice coil 30 coupled to one side of the diaphragm. When the sound-generating device 100 is working, after the voice coil 30 is energized, under the action of the magnetic field force of the magnetic circuit system 40, the voice coil 30 may vibrate up and down to drive the diaphragm 20 to vibrate, and the diaphragm 20 may generate sound when vibrating.

[0089] In the embodiment of the present invention, the waterproof level of the sound-emitting device is at least 1ATM, which meets the 10m waterproof reliability verification requirement. It can be understood that since methylphenyl vinyl silicone resin is used as a reinforcing material in the liquid phenyl silicone rubber compound, the adhesion between the diaphragm and the shell is greatly improved, thereby improving the waterproof performance of the sound-emitting device, so that the waterproof level of the sound-emitting device is at least 1ATM.

[0090] The present invention also provides a method for preparing a sound-generating device having a diaphragm according to any of the above embodiments, the method comprising the following steps:

[0091] placing the shell into the mold;

[0092] Injecting liquid phenyl silicone rubber compound into the mold and closing the mold;

[0093] The mold is heated to a temperature of 100° C. to 200° C., and the liquid phenyl silicone rubber compound is solidified and formed integrally with the shell in the mold to obtain a diaphragm having a phenyl silicone rubber layer integrally bonded to the shell.

[0094] Illustratively, the mold heating temperature may be one of 100° C., 120° C., 140° C., 150° C., 180° C., 200° C., or any value within the above range.

[0095] In the implementation manner of the present invention, the voice coil can be bonded, the magnetic circuit system can be installed and the shell can be packaged to form a finished sound-generating device according to actual use requirements.

[0096] The chemical reagents used in the specification and examples of the present invention include any conventional models or types in the art, and the present invention does not impose any special limiting requirements.

[0097] The diaphragm and the sound-generating device of the sound-generating device according to the embodiment of the present invention are described in detail below in combination with specific embodiments and comparative examples. It is worth noting that the following description is merely exemplary and not a specific limitation to the present invention.

[0098] Example 1

[0099] Disclosed is a diaphragm of a sound-generating device, the diaphragm comprising a phenyl silicone rubber layer, the phenyl silicone rubber layer being formed by curing a liquid phenyl silicone rubber compound; the composition of the liquid phenyl silicone rubber compound is as follows:

[0100] Methylphenylvinyl polysiloxane: 100 parts;

[0101] Silicon dioxide (reinforcing agent): 20 parts;

[0102] Methylphenyl vinyl silicone resin: 15 parts;

[0103] Phenyl hydrogen silicone oil: 3 parts;

[0104] Chloroplatinic acid (platinum catalyst): 0.2 parts;

[0105] 3-Methyl-1-butyn-3-ol (inhibitor): 0.15 parts.

[0106] The mass percentage of phenyl in phenyl hydrogen silicone oil is 15wt%, and the mass percentage of hydrogen in phenyl hydrogen silicone oil is 1wt%; the mass percentage of vinyl in methylphenyl vinyl polysiloxane is 0.12wt%, and the mass percentage of phenyl in methylphenyl vinyl polysiloxane is 20wt%. The mass percentage of vinyl in methylphenyl vinyl silicone resin is 0.4wt%, and the mass percentage of phenyl in methylphenyl vinyl silicone resin is 30wt%.

[0107] The phenyl silicone rubber layer contains a network polymer, which includes segments: The R group is a phenyl group, and the mass percentage of the phenyl group in the chain segment accounts for 18% of the entire phenyl silicone rubber layer.

[0108] The diaphragm and shell of the sound-generating device are integrally heated and cured, and the heating temperature is 150°C.

[0109] Example 2

[0110] The remaining operations are the same as those of Example 1, except that the composition of the liquid phenyl silicone rubber compound is as follows:

[0111] Methylphenylvinyl polysiloxane: 100 parts;

[0112] Silicon dioxide (reinforcing agent): 40 parts;

[0113] Methylphenyl vinyl silicone resin: 30 parts;

[0114] Phenyl hydrogen silicone oil: 3.5 parts;

[0115] Platinum-1,3-divinyltetramethyldisiloxane complex (platinum catalyst): 0.2 parts;

[0116] 3-Methyl-1-pentyn-3-ol (inhibitor): 0.15 parts.

[0117] The mass percentage of phenyl in phenyl hydrogen silicone oil is 25wt%, and the mass percentage of hydrogen in phenyl hydrogen silicone oil is 0.8wt%; the mass percentage of vinyl in methylphenyl vinyl polysiloxane is 0.10wt%, and the mass percentage of phenyl in methylphenyl vinyl polysiloxane is 13wt%. The mass percentage of vinyl in methylphenyl vinyl silicone resin is 0.45wt%, and the mass percentage of phenyl in methylphenyl vinyl silicone resin is 40wt%.

[0118] The phenyl silicone rubber layer contains a network polymer, which includes segments: The R group is a phenyl group, and the mass percentage of the phenyl group in the chain segment accounts for 14.9% of the entire phenyl silicone rubber layer.

[0119] The diaphragm and shell of the sound-generating device are integrally heated and cured, and the heating temperature is 160°C.

[0120] Example 3

[0121] The remaining operations are the same as those of Example 1, except that the composition of the liquid phenyl silicone rubber compound is as follows:

[0122] Methylphenylvinyl polysiloxane: 100 parts;

[0123] Silicon dioxide (reinforcing agent): 60 parts;

[0124] Methylphenyl vinyl silicone resin: 35 parts;

[0125] Phenyl hydrogen silicone oil: 3.9 parts;

[0126] Platinum-1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane complex (platinum catalyst): 0.2 parts;

[0127] 3,5-Dimethyl-1-hexyn-3-ol (inhibitor): 0.15 parts.

[0128] The mass percentage of phenyl in phenyl hydrogen silicone oil is 30wt%, and the mass percentage of hydrogen in phenyl hydrogen silicone oil is 0.6wt%; the mass percentage of vinyl in methylphenyl vinyl polysiloxane is 0.07wt%, and the mass percentage of phenyl in methylphenyl vinyl polysiloxane is 10wt%. The mass percentage of vinyl in methylphenyl vinyl silicone resin is 0.3wt%, and the mass percentage of phenyl in methylphenyl vinyl silicone resin is 45wt%.

[0129] The phenyl silicone rubber layer contains a network polymer, which includes segments: The R group is a methyl group, and the mass percentage of the phenyl group in the chain segment accounts for 13.5% of the entire phenyl silicone rubber layer.

[0130] The diaphragm and shell of the sound-generating device are integrally heated and cured, and the heating temperature is 150°C.

[0131] Example 4

[0132] The remaining operations are the same as those of Example 1, except that the composition of the liquid phenyl silicone rubber compound is as follows:

[0133] Methylphenylvinyl polysiloxane: 100 parts;

[0134] Silicon dioxide (reinforcing agent): 50 parts;

[0135] Methylphenyl vinyl silicone resin: 15 parts;

[0136] Phenyl hydrogen silicone oil: 3.1 parts;

[0137] Platinum-bis(alkynyl)(cyclodiene) complex (platinum catalyst): 0.2 parts;

[0138] 1-ethynyl-1-cyclohexanol (inhibitor): 0.15 parts;

[0139] Methylphenyl silicone resin: 10 parts.

[0140] Among them, the mass percentage of phenyl in phenyl hydrogen-containing silicone oil is 13wt%, and the mass percentage of hydrogen in phenyl hydrogen-containing silicone oil is 0.45wt%; the mass percentage of vinyl in methylphenyl vinyl polysiloxane is 0.08wt%, the mass percentage of phenyl in methylphenyl vinyl polysiloxane is 18wt%, and the mass percentage of phenyl in methylphenyl silicone resin is 20wt%; the mass percentage of vinyl in methylphenyl vinyl silicone resin is 0.35wt%, and the mass percentage of phenyl in methylphenyl vinyl silicone resin is 20wt%.

[0141] The phenyl silicone rubber layer contains a network polymer, which includes segments: The R group is a methyl group, and the mass percentage of the phenyl group in the chain segment accounts for 13.2% of the entire phenyl silicone rubber layer.

[0142] The diaphragm and shell of the sound-generating device are integrally heated and cured, and the heating temperature is 145°C.

[0143] Comparative Example 1

[0144] The remaining operations are the same as those of Example 1, except that the composition of the liquid phenyl silicone rubber compound is as follows:

[0145] Methyl vinyl silicone oil: 100 parts;

[0146] Silicon dioxide (reinforcing agent): 50 parts;

[0147] Methyl vinyl silicone resin: 15 parts;

[0148] Hydrogenated silicone oil: 3 parts;

[0149] Chloroplatinic acid (catalyst): 0.2 parts;

[0150] 3-Methyl-1-butyn-3-ol (inhibitor): 0.15 parts.

[0151] Comparative Example 2

[0152] The remaining operations are the same as those of Example 1, except that the composition of the liquid phenyl silicone rubber compound is as follows:

[0153] Methylphenylvinyl polysiloxane: 100 parts;

[0154] Silicon dioxide (reinforcing agent): 50 parts;

[0155] Methyl vinyl silicone resin: 15 parts;

[0156] Hydrogenated silicone oil: 3 parts;

[0157] Chloroplatinic acid (catalyst): 0.2 parts;

[0158] 3-Methyl-1-butyn-3-ol (inhibitor): 0.15 parts.

[0159] The outer dimensions of the diaphragms prepared in the embodiment of the present invention and the comparative example are completely consistent, wherein the components and proportions of the liquid phenyl silicone rubber compound of the diaphragms prepared in the embodiment and the comparative example are shown in Table 1.

[0160] Table 1 Summary of components of liquid phenyl silicone rubber compound in Examples and Comparative Examples

[0161]

[0162]

[0163] Performance Testing

[0164] Hardness: Tested according to GBT531.1-2008.

[0165] Tensile strength: tested using GBT528-2009.

[0166] Tear strength: tested using GBT529-2008.

[0167] Loss factor: DMA was used to test the loss factor of the silicone film. The test conditions were: temperature range -100°C to 100°C, and heating rate was 3°C / min.

[0168] Light transmittance: tested using GBT2410-2008.

[0169] Adhesion between diaphragm and shell: A self-made test equipment was prepared, which included a fixed fixture. During the test, the shell was fixed on the fixture and the dynamometer was placed in the middle of the diaphragm. The maximum ejection force that would cause the diaphragm and shell to be damaged was tested and recorded as the adhesion between the two.

[0170] The diaphragms prepared in Examples 1-4 of the present invention and the diaphragms prepared in Comparative Examples 1-2 were tested for performance such as hardness, tensile strength, tear strength, loss factor, light transmittance, and adhesion between the diaphragm and the shell. The test results are shown in Table 2.

[0171] Table 2 Summary of performance test results of diaphragms prepared in Examples and Comparative Examples

[0172]

[0173] It can be seen from Table 2 that the comprehensive performance of the diaphragm in the present invention is excellent, especially the loss factor, light transmittance, adhesion between the diaphragm and the shell, tear strength, tensile strength, etc. of the diaphragm are better than the corresponding performance of the diaphragm in the comparative example under the same conditions. Among them, in the case of the shell in comparative example 1 without primer treatment, the adhesion between the diaphragm and the shell is only 0.5N, the adhesion value is too low, and the diaphragm is prone to local cracking and failure during the vibration process; and the loss factor of the diaphragm in comparative example 1 is 0.078, the loss factor is very low, the THD distortion is too high, and the acoustic performance is poor.

[0174] In Comparative Example 2, due to the poor compatibility of methyl vinyl silicone resin and hydrogen-containing silicone oil with methyl phenyl vinyl polysiloxane, local aggregation is caused, and light reflection, scattering, and diffuse reflection occur at the local aggregation site, resulting in low light transmittance of the diaphragm; and hydrogen-containing silicone oil has poor compatibility and poor distribution and dispersion uniformity in the liquid phenyl silicone rubber compound, so its local differences will lead to uneven mechanical properties of the diaphragm, and thus its tearing and tensile properties are insufficient. In addition, the diaphragm has poor light transmittance. During the UV glue curing process, the transmittance of UV light is low, so the curing time is long, which affects production efficiency and causes an increase in product costs.

[0175] Reliability Verification

[0176] High temperature and high humidity reliability: operate for 120 hours at 85℃, 85% humidity and rated voltage.

[0177] High power reliability: Run for 72 hours at 1.2 times rated voltage.

[0178] High and low temperature cycle reliability: Run at rated voltage, -20℃ for 20 minutes, run at 65℃ for 20 minutes as one cycle, and run 120 cycles.

[0179] Waterproof performance test: A water depth test of 10m was conducted to test whether there was a membrane breakage phenomenon. After testing, it was found that the diaphragm in the embodiment of the present invention did not have a membrane breakage phenomenon, and had a relatively good waterproof effect, meeting the waterproof requirements of acoustic equipment.

[0180] Table 3 Comparison of reliability results of diaphragms in the embodiments and comparative examples

[0181] name High temperature and high humidity reliability High power reliability High and low temperature cycle reliability Waterproof Example 1 pass pass pass 1ATM Example 2 pass pass pass 1ATM Example 3 pass pass pass 1ATM Example 4 pass pass pass 1ATM Comparative Example 1 Failed Failed Failed 1ATM Comparative Example 2 pass Failed Failed 1ATM

[0182] Combining Table 3 and Figure 2 It can be seen that the diaphragms in the present invention have all passed the tests of high temperature and high humidity reliability, high power reliability, high and low temperature cycle reliability, 1ATM waterproof performance, etc. However, due to the insufficient adhesion between the diaphragm and the shell in Comparative Example 1, stress concentration is prone to cause local cracking and failure during the reliability verification process. The loss factor of the diaphragm in Comparative Example 1 is too small, the damping performance is poor, and the THD distortion is too high.

[0183] During the high-power reliability verification process in Comparative Example 2, the diaphragm had a large amplitude and a large stretching, and stress concentration in local areas caused the weak areas of the diaphragm to rupture and fail.

[0184] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A diaphragm of a sound-generating device, characterized in that: It comprises at least one phenyl silicone rubber layer, wherein the phenyl silicone rubber layer is formed by curing a liquid phenyl silicone rubber compound, wherein the liquid phenyl silicone rubber compound comprises methylphenyl vinyl polysiloxane, methylphenyl vinyl silicone resin and phenyl hydrogenated silicone oil; the phenyl silicone rubber layer contains a network polymer, wherein the network polymer comprises a segment: Wherein, the R group is at least one of a methyl group and a phenyl group. The mass percentage of the phenyl groups in the chain segments in the entire phenyl silicone rubber layer is 3% to 30%.

2. The diaphragm of the sound-generating device according to claim 1, characterized in that: The hardness of the phenyl silicone rubber layer is 30A to 90A; and / or, The tensile strength of the phenyl silicone rubber layer is 1 MPa to 10 MPa; and / or, The loss factor of the phenyl silicone rubber layer is 0.15 to 0.4; and / or, The light transmittance of the phenyl silicone rubber layer is 20% to 75%; Preferably, the The mass percentage of the phenyl groups in the chain segments in the entire phenyl silicone rubber layer is 8% to 20%.

3. The diaphragm of the sound-generating device according to claim 1 or 2, characterized in that: In the liquid phenyl silicone rubber compound, the mass percentage of the methylphenyl vinyl silicone resin is 2wt% to 25wt%, and / or, The mass percentage of the phenyl hydrogen silicone oil is 0.1-5wt%, and / or, The mass percentage of the methylphenylvinyl polysiloxane is 45wt% to 90wt%.

4. The diaphragm of the sound-generating device according to claim 1, characterized in that: The mass percentage of phenyl groups in the phenyl hydrogen-containing silicone oil is 2wt% to 50wt%, and the mass percentage of hydrogen groups in the phenyl hydrogen-containing silicone oil is 0.05wt% to 1.5wt%; and / or, The mass percentage of the vinyl group in the methylphenylvinyl polysiloxane is 0.05 wt % to 9 wt %, and the mass percentage of the phenyl group in the methylphenylvinyl polysiloxane is 3 wt % to 45 wt %.

5. The diaphragm of the sound-generating device according to claim 1, characterized in that: The liquid phenyl silicone rubber compound also includes a reinforcing agent; Preferably, the reinforcing agent is selected from silicon dioxide; and / or, The mass percentage of the reinforcing agent is 5wt% to 45wt%.

6. The diaphragm of the sound-generating device according to claim 1 or 5, characterized in that: The liquid phenyl silicone rubber compound further includes at least one of an inhibitor and a catalyst; Preferably, the mass percentage of the inhibitor is 0.01wt% to 0.2wt%; and / or, The mass percentage of the catalyst is 0.005wt% to 0.2wt%; Preferably, the inhibitor comprises at least one of an acetylenic alcohol inhibitor and a polyvinyl polysiloxane inhibitor; and / or, The catalyst is selected from platinum catalysts.

7. The diaphragm of the sound-generating device according to claim 1 or 5, characterized in that: The liquid phenyl silicone rubber compound further includes methyl phenyl silicone resin, and the mass percentage of the methyl phenyl silicone resin in the liquid phenyl silicone rubber compound is 0 to 20wt% and is not 0; Preferably, the mass percentage of phenyl groups in the methylphenyl silicone resin is 2wt% to 50wt%.

8. The diaphragm of the sound-generating device according to claim 1, characterized in that: The diaphragm is a single-layer structure, and the diaphragm is composed of a layer of the phenyl silicone rubber layer; or, The diaphragm is formed into a composite layer structure, which includes at least one layer of the phenyl silicone rubber layer and a composite layer, and the composite layer includes at least one of a thermoplastic elastomer layer, an engineering plastic layer and a film layer.

9. A sound-generating device, characterized in that: The sound-generating device comprises the diaphragm of the sound-generating device according to any one of claims 1-8.

10. The sound generating device according to claim 9, characterized in that: The sound-generating device comprises a shell, and the diaphragm of the sound-generating device and the shell are integrally formed by heating and curing; And / or, the sound-generating device has a waterproof rating of at least 1ATM.

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