Silica gel vibrating diaphragm, preparation process thereof and application of silica gel vibrating diaphragm in loudspeaker

Abstract

The invention relates to the field of intelligent voice accessories, and discloses a silica gel vibrating diaphragm, a preparation process thereof and application of the silica gel vibrating diaphragm in a loudspeaker. The silica gel vibrating diaphragm is prepared from liquid silica gel materials of a component A and a component B, wherein the component A comprises 65-85 parts of vinyl silicone oil, 20-30 parts of methyl vinyl MQ silicon resin, 12-18 parts of a vinyl silane mixture, 15-25 parts of silicon dioxide, 4-8 parts of an elastic aid, 0.1-0.3 part of a platinum catalyst and 0.05-0.12 part of an inhibitor; the component B comprises the following components in parts by weight: 40-60 parts of vinyl silicone oil, 8-15 parts of hydrogen-containing silicone oil, 10-20 parts of silicon dioxide and 2-4 parts of hydroxyl silicone oil; and the vinyl silane mixture is composed of a trimethyl-terminated vinyl methyl-dimethyl polysiloxane copolymer, 1, 3, 5,-trivinyl-1, 3, 5-trimethylcyclotrisiloxane, and vinyl tri-butanone dirty-based silane. The loudspeaker has the advantages of being good in elasticity and sealing performance, good in vibration performance when applied to the loudspeaker and not prone to audio distortion.

Description

Technical Field

[0001] This application relates to the field of intelligent voice accessories, and more specifically, it relates to a silicone diaphragm, its manufacturing process, and its application in a loudspeaker. Background Technology

[0002] The diaphragm assembly in headphones plays a crucial role in sound transmission. The diaphragm is the core component of headphones, generating sound through vibration and directly affecting the clarity, detail, and overall sound quality of the headphones.

[0003] Traditional diaphragm assemblies typically consist of a voice coil and a diaphragm, which are bonded together with adhesive to achieve synchronized vibration. The diaphragm is usually made of PET material, which, while inexpensive, offers relatively poor sound quality. This results in poor balance and significant sound distortion in the diaphragm assembly. Summary of the Invention

[0004] To address the problem of poor vibration performance in existing diaphragm assemblies used in loudspeakers, which easily leads to sound distortion, this application provides a silicone diaphragm, its fabrication process, and its application in loudspeakers.

[0005] In a first aspect, this application provides a silicone diaphragm, employing the following technical solution: A silicone diaphragm is obtained by injection molding from liquid silicone material. The liquid silicone material is composed of component A and component B. Component A is made from the following raw materials in parts by weight: 65-85 parts vinyl silicone oil, 20-30 parts methyl vinyl MQ silicone resin, 12-18 parts vinyl silane mixture, 15-25 parts silica, 4-8 parts elastic additive, 0.1-0.3 parts platinum catalyst, and 0.05-0.12 parts inhibitor. Component B is made from the following raw materials in parts by weight: 40-60 parts vinyl silicone oil, 8-15 parts hydrogen-containing silicone oil, 10-20 parts silica, and 2-4 parts hydroxyl silicone oil. The vinyl silane mixture is composed of trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, 1,3,5,-trivinyl-1,3,5-trimethylcyclotrisiloxane, and vinyltributyl ketone silane.

[0006] By adopting the above technical solution, the silicone diaphragm of this application is obtained by injection molding of a two-component liquid silicone material. The two-component liquid silicone material has good fluidity and good molding performance, and the overall quality stability of the silicone diaphragm is high. Component A uses vinyl silicone oil as the base component, providing vinyl crosslinking groups to enhance the elasticity of the silicone diaphragm. Methyl vinyl MQ silicone resin synergistically enhances the crosslinking density of the system, increasing the flexibility of the silicone diaphragm. The vinyl silane mixture consists of trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, 1,3,5-trivinyl-1,3,5-trimethylcyclotrisiloxane, and vinyltributylone oxime silane. These three components synergistically enhance each other, further crosslinking with vinyl silicone oil, methyl vinyl MQ silicone resin, and elastic additives to form a dense, interwoven network structure, further improving the elasticity and flexibility of the resulting silicone diaphragm. Silica is dispersed in the crosslinking system, further enhancing its density and reducing the risk of deformation and reduced sealing during long-term use. A platinum catalyst accelerates the reaction process, while an inhibitor controls the reaction rate, ensuring system stability. The hydrogen-containing silicone oil in component B provides the system with silane-hydrogen reactive groups, which can undergo an addition reaction with vinyl groups under the action of a catalyst. As a result, the silicone diaphragm made from the liquid silicone material made from specific components A and B has good elasticity, flexibility and sealing properties, and when used in loudspeakers, it has good vibration performance and is not prone to audio distortion.

[0007] Preferably, the weight ratio of the trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, the 1,3,5,-trivinyl-1,3,5-trimethylcyclotrisiloxane, and the vinyltributyl ketone silane is (3-5):(2-4):1.

[0008] By employing the above technical solution, a synergistic effect can be further achieved in the liquid silicone material system by compounding trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, 1,3,5-trivinyl-1,3,5-trimethylcyclotrisiloxane, and vinyltributanone oxime silane in a preferred weight ratio. This helps improve the chemical stability and reactivity of the liquid silicone material, resulting in silicone diaphragms with better elasticity, flexibility, and sealing properties. Consequently, the vibration performance of the silicone diaphragm is enhanced when applied to loudspeakers, effectively reducing audio distortion and improving the sound quality of headphones and audio loudspeakers.

[0009] Preferably, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane with a vinyl molar content of 0.19-0.25% and a viscosity of 200-400 cst at 25°C.

[0010] By adopting the above technical solution, the vinyl molar content and viscosity of vinyl silicone oil are optimized to provide better reactivity and system viscosity, ensuring the molding quality of liquid silicone material. This allows the liquid silicone material to undergo better cross-linking reaction during injection molding, which helps to improve the elasticity and stability of silicone diaphragms.

[0011] Preferably, the methyl vinyl MQ silicone resin has a vinyl molar content of 1-1.5%, an MQ ratio of (0.8-0.9):1, and a viscosity of 80,000-100,000 cst at 25°C.

[0012] By adopting the above technical solution, the vinyl molar content, MQ ratio and viscosity of methyl vinyl MQ silicone resin can be optimized, which can further provide excellent reactivity for the reaction, improve the reaction efficiency with vinyl silicone oil and vinyl silane mixture, and thus improve the strength, elasticity and flexibility of the prepared silicone diaphragm.

[0013] Preferably, the elastic additive is composed of maleic anhydride modified liquid polybutadiene rubber and triallyl isocyanurate in a weight ratio of 1:(1.5-2.5).

[0014] By adopting the above technical solution, maleic anhydride modified liquid polybutadiene rubber has vinyl active groups and maleic anhydride molecular structure, which can be dispersed into liquid silicone material system and stably crosslink with the system. This reduces the problem of uneven local stress or reduced flexibility of silicone diaphragm due to excessive crosslinking. Triallyl triallyl isocyanurate can further provide crosslinking sites for the system, and produce a good synergistic effect with maleic anhydride modified liquid polybutadiene rubber to improve the elasticity and sealing of the prepared silicone diaphragm.

[0015] Preferably, the hydrogen-containing silicone oil is an end-hydrogen-containing silicone oil with a hydrogen molar content of 1.3-1.5%.

[0016] By adopting the above technical solution, an optimal molar amount of hydrogen can provide cross-linking silane-hydrogen bonds for the reaction of liquid silicone material, thereby improving the stability of the cross-linking reaction. If the hydrogen content of the hydrogen-containing silicone oil is low, the flexibility and elasticity of the resulting silicone diaphragm will decrease.

[0017] Preferably, the inhibitor is 1-ethynylcyclohexanol and / or tert-butylcyclohexanol.

[0018] By adopting the above technical solution and using 1-ethynylcyclohexanol and / or tert-butylcyclohexanol as inhibitors, the reaction rate of the silicone diaphragm can be better controlled during the injection molding process, ensuring that the liquid silicone material can be injection molded stably, and producing a silicone diaphragm with good elasticity and sealing, good vibration and low audio distortion.

[0019] Secondly, this application provides a manufacturing process for silicone diaphragms, employing the following technical solution: A fabrication process for a silicone diaphragm includes the following steps: Preparation of Component A: Vinyl silicone oil, vinyl MQ silicone resin, a mixture of vinyl silanes, silica, elastic additives, platinum catalyst and inhibitor are dispersed under vacuum by stirring; Preparation of component B: Vinyl silicone oil, hydrogen-containing silicone oil, silica and hydroxyl silicone oil are dispersed by vacuum stirring; component A and component B are mixed in a 1:1 weight ratio and injection molded to obtain a silicone diaphragm.

[0020] By adopting the above technical solution, component A is first prepared by vacuum stirring and dispersing vinyl silicone oil, methyl vinyl MQ silicone resin, a mixture of vinyl silanes, silica, elastic additives, platinum catalysts, and inhibitors. This ensures that all raw materials are fully and uniformly mixed, guaranteeing the stability and consistency of component A. Component B is then prepared by vacuum stirring and dispersing vinyl silicone oil, hydrogen-containing silicone oil, silica, and hydroxyl silicone oil, which similarly ensures the quality stability of component B. Finally, components A and B are mixed in a 1:1 weight ratio and injection molded to obtain a silicone diaphragm. This allows the two components to fully react, forming a silicone diaphragm with good elasticity and sealing properties. The silicone diaphragm produced by the injection molding process has good precision and stability.

[0021] Preferably, the injection molding temperature is 100-120℃ and the time is 10-15min.

[0022] By adopting the above technical solution, the injection molding temperature is controlled at 100-120℃ and the time is controlled at 10-15min, which helps the liquid silicone material to react fully, making the molding process more stable, ensuring the molding quality of the silicone diaphragm, and improving the elasticity, sealing and vibration of the silicone diaphragm.

[0023] Thirdly, this application provides an application of a silicone diaphragm in a loudspeaker, using the following technical solution: an application of a silicone diaphragm in a loudspeaker, used in loudspeakers for headphones and audio equipment.

[0024] By adopting the above technical solution, the silicone diaphragm is injection molded from liquid silicone material with a specific formula. It has good elasticity and sealing properties. When applied to the speakers of headphones and audio equipment, it can improve the speaker's vibration performance, reduce audio distortion, and improve sound clarity and sound quality.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The silicone diaphragm of this application is prepared by injection molding of liquid silicone material, consisting of component A (vinyl silicone oil, methyl vinyl MQ silicone resin, a mixture of vinyl silanes, silica, elastic additives, platinum catalysts, and inhibitors) and component B (vinyl silicone oil, hydrogen-containing silicone oil, silica, and hydroxyl silicone oil). The synergistic effect of these raw materials gives the silicone diaphragm excellent elasticity, flexibility, and sealing properties, resulting in good vibration performance and minimal audio distortion when applied to loudspeakers.

[0026] 2. The vinyl silane mixture is composed of trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, 1,3,5,-trivinyl-1,3,5-trimethylcyclotrisiloxane and vinyltributyl ketone silane in a certain weight ratio. The three raw materials work synergistically to improve the molecular structure and cross-linking density of the silicone diaphragm, which helps to improve the elasticity, flexibility and sealing of the silicone diaphragm.

[0027] 3. The elastic additive is composed of maleic anhydride modified liquid polybutadiene rubber and triallyl isocyanurate. The two raw materials work synergistically to enhance the intermolecular interaction force, which can enhance the elasticity and flexibility of the silicone diaphragm.

[0028] 4. The preparation process of this application involves injection molding a liquid silicone material composed of component A and component B to obtain a silicone diaphragm. This process has high precision and the overall quality stability of the silicone diaphragm is good. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the embodiments.

[0030] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used: 1. Trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer: Nanjing Xisibo VF6050; 2. Maleic anhydride modified liquid polybutadiene rubber: MA-75 Evonik; 3. Platinum catalyst: Castel platinum catalyst, platinum content 8000ppm. Example

[0031] Example 1 Example 1 discloses a silicone diaphragm, which is prepared by the following steps: Preparation of Component A: 6.5 kg vinyl silicone oil, 3 kg methyl vinyl MQ silicone resin, 1.8 kg vinyl silane mixture, 1.5 kg 50 nm silica, 0.4 kg elastic additive, 0.01 kg platinum catalyst and 0.005 kg inhibitor were dispersed under vacuum by stirring. Preparation of component B: 4 kg of vinyl silicone oil, 0.8 kg of hydrogen-containing silicone oil, 1 kg of 50 nm silica and 0.2 kg of hydroxyl silicone oil were dispersed under vacuum by stirring. Component A and component B were mixed in a 1:1 weight ratio and injection molded using a liquid silicone injection molding machine at an injection temperature of 120°C for 10 minutes to obtain a silicone diaphragm. Both component A and component B contain vinyl-terminated polydimethylsiloxane, with a molar content of 0.19% and a viscosity of 400 cst. The vinyl content of methyl vinyl MQ silicone resin is 1.5%, the MQ ratio is 0.8:1, and the viscosity is 80,000. The vinyl silane mixture consists of a trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, 1,3,5,-trivinyl-1,3,5-trimethylcyclotrisiloxane, and vinyltributyl ketone silane in a weight ratio of 3:2:1. The elasticity additive is composed of vinyltrimethoxysilane and triallyl isocyanurate in a weight ratio of 1:1.5; The hydrogen-containing silicone oil is an end-hydrogen-containing silicone oil with a hydrogen molar content of 1.3%. The hydroxyl content of the silicone oil is 8%.

[0032] Example 2-3 The difference between Examples 2-3 and Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0033] Table 1 Parameter table for Examples 1-3 Example 4 The difference between Example 4 and Example 1 is that the elastic additive is composed of maleic anhydride modified liquid polybutadiene rubber and triallyl isocyanurate in a weight ratio of 1:1.5, while the rest is the same as in Example 1.

[0034] Example 5 The difference between Example 5 and Example 1 is that the elastic additive is composed of maleic anhydride modified liquid polybutadiene rubber and triallyl isocyanurate in a weight ratio of 1:2.5, while the rest is the same as in Example 1.

[0035] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer was replaced in equal amounts with vinyldimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer. (Nanjing Xisbo) VF6060, otherwise the same as in Example 1.

[0036] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that 1,3,5,-trivinyl-1,3,5-trimethylcyclotrisiloxane was replaced in equal amounts with trimethyl-terminated vinylmethyl-dimethylpolysiloxane copolymer, while the rest was the same as in Example 1.

[0037] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that vinyltributylone silane was replaced in equal amounts with 1,3,5,-trivinyl-1,3,5-trimethylcyclotrisiloxane, otherwise it is the same as Example 1.

[0038] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the vinyl silane mixture was replaced with an equal amount of vinyl silicone oil, while the rest was the same as in Example 1.

[0039] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that the elastic additive was replaced with an equal amount of vinylsilane mixture, otherwise it was the same as Example 1.

[0040] Performance testing The following are performance tests of the silicone diaphragms in Examples 1-5 and Comparative Examples 1-5: Specifications: The silicone diaphragm is 1mm thick and 14.2mm in diameter; 1. Hardness testing: The hardness (unit: A) of the silicone diaphragm was tested using a Shore hardness tester, and the test results were recorded.

[0041] 2. Elongation at break test: A tensile testing machine was used to perform a tensile test on the silicone diaphragm, and the elongation at break of the silicone diaphragm (unit: %) was recorded. The test results were then tested and recorded.

[0042] 3. Compression performance test: A 1kg load was applied to the silicone diaphragm, with a compression rate of 50%. The diaphragm was compressed for 24 hours at a temperature of 40℃, and then allowed to recover for 30 minutes at a temperature of 25℃. The compression deformation rate (unit: %) of the silicone diaphragm was then tested. The compression deformation rate was calculated as (thickness before compression - thickness after compression) / thickness before compression * 100%. The test results were recorded.

[0043] The following are the performance test data of the silicone diaphragms of Examples 1-5 and Comparative Examples 1-5, as detailed in Table 2 below.

[0044] Table 2 Performance data of silicone diaphragms in Examples 1-5 and Comparative Examples 1-5 Combining Examples 1-3 and Examples 4-5 with Table 2, it can be concluded that, compared with Example 1, the hardness of the silicone diaphragm in Examples 4-5 is reduced, the elongation at break is increased, and the compression deformation rate is reduced. This indicates that using maleic anhydride-modified liquid polybutadiene rubber and triallyl isocyanurate in a better weight ratio as elastic additives can improve the elasticity, flexibility, and sealing of the silicone diaphragm, making it less prone to deformation. When applied to loudspeakers, it can improve the vibration stability of the loudspeakers and provide good sound stability.

[0045] Based on Example 1, Comparative Examples 1-3, 4-5, and Table 2, it can be concluded that, compared to Example 1, Comparative Examples 1-3 changed the type of vinyl silane mixture, resulting in a significant increase in the hardness, elongation at break, and compression set of the prepared silicone diaphragm. This indicates that using a more optimized weight ratio of trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, the 1,3,5,-trivinyl-1,3,5-trimethylcyclotrisiloxane, and the vinyltributyl ketone silane as the vinyl silane mixture can significantly improve the elasticity, flexibility, and stability of the prepared silicone diaphragm. In contrast, Comparative Example 4 did not add the vinyl silane mixture, and Comparative Example 5 did not use any elastic additives. The resulting silicone diaphragm showed significantly increased hardness, elongation at break, and compression set, possibly because the combined effect of the vinyl silane mixture, elastic additives, and vinyl silicone oil in the system was reduced, thus decreasing the performance of the silicone diaphragm.

[0046] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A silicon gel diaphragm, characterized in that, The liquid silicone material is prepared by injection molding, and the liquid silicone material is composed of an A component and a B component. The A component is prepared from the following raw materials in parts by weight: 65-85 parts of a vinyl silicone oil, 20-30 parts of a methyl vinyl MQ silicone resin, 12-18 parts of a vinyl silane mixture, 15-25 parts of silica, 4-8 parts of an elastomeric aid, 0.1-0.3 parts of a platinum catalyst, and 0.05-0.12 parts of an inhibitor. The B component is prepared from the following raw materials in parts by weight: 40-60 parts of a vinyl silicone oil, 8-15 parts of a hydrogen-containing silicone oil, 10-20 parts of silica, and 2-4 parts of a hydroxyl silicone oil. The vinyl silane mixture is composed of a trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, 1,3,5,-trivinyl-1,3,5-trimethyl cyclotrisiloxane, and a vinyl tributyl ketone-contaminated silane.

2. The silicon-gel diaphragm according to claim 1, wherein The weight ratio of the trimethyl-terminated vinylmethyl-dimethyl polysiloxane copolymer, the 1,3,5,-trivinyl-1,3,5-trimethyl cyclotrisiloxane, and the vinyl tributyl ketone-contaminated silane is (3-5):(2-4):

1.

3. The silicon-gel diaphragm according to claim 1, wherein The vinyl silicone oil is a vinyl-terminated polydimethylsiloxane, with a vinyl molar content of 0.19-0.25% and a viscosity of 200-400 cst at 25°C.

4. The silicon-gel diaphragm according to claim 1, wherein The methyl vinyl MQ silicone resin has a vinyl molar content of 1-1.5%, an MQ ratio of (0.8-0.9):1, and a viscosity of 80-100 thousand cst at 25°C.

5. The silicon-gel diaphragm according to claim 1, wherein The elastomeric aid is composed of a maleic anhydride-modified liquid polybutadiene rubber and a triallyl isocyanurate in a weight ratio of 1:(1.5-2.5).

6. The silicon-gel diaphragm according to claim 1, wherein The hydrogen-containing silicone oil is a terminal hydrogen-containing silicone oil, with a hydrogen molar content of 1.3-1.5%.

7. The silicon-gel diaphragm according to claim 1, wherein The inhibitor is 1-ethynylcyclohexanol and / or t-butylcyclohexanol.

8. A process for preparing a silicon-gel diaphragm according to any one of claims 1 to 7, characterized in that: The preparation steps include the following: Preparation of the A component: vacuum stirring and dispersion of the vinyl silicone oil, the vinyl MQ silicone resin, the vinyl silane mixture, the silica, the elastomeric aid, the platinum catalyst, and the inhibitor; Preparation of the B component: vacuum stirring and dispersion of the vinyl silicone oil, the hydrogen-containing silicone oil, the silica, and the hydroxyl silicone oil; Mixing of the A component and the B component in a weight ratio of 1:1 and injection molding to obtain a silicone diaphragm.

9. The process for preparing a silicon-gel diaphragm according to claim 8, wherein The injection molding temperature is 100-120°C, and the time is 10-15 min.

10. Use of a silicon gel diaphragm according to any one of claims 1 to 7, characterized in that, The silicone diaphragm is applied to a loudspeaker of a headset and a sound system.

Images